/* ==========================================================================
   Learning Lab — design system
   Dark "control room" theme by default, light theme via [data-theme=light].
   ========================================================================== */

:root {
  color-scheme: dark;
  --bg: #070b14;
  --bg-soft: #0a1020;
  --bg-elev: #0d1526;
  --panel: rgba(255, 255, 255, 0.045);
  --panel-2: rgba(255, 255, 255, 0.075);
  --panel-solid: #0f172a;
  --line: rgba(148, 163, 184, 0.18);
  --line-strong: rgba(148, 163, 184, 0.34);
  --text: #e7eefb;
  --text-soft: #c2cee2;
  --muted: #93a3bb;
  --dim: #6b7c96;
  --accent: #38bdf8;
  --accent-ink: #04121c;
  --accent-2: #a78bfa;
  --ok: #34d399;
  --warn: #fbbf24;
  --danger: #f87171;
  --pink: #f472b6;
  --orange: #fb923c;
  --teal: #2dd4bf;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 24px 70px -40px rgba(0, 0, 0, 0.9);
  --mono: ui-monospace, SFMono-Regular, "JetBrains Mono", "Cascadia Mono", Consolas, "Liberation Mono", monospace;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --maxw: 1280px;
}

[data-theme="light"] {
  color-scheme: light;
  --bg: #f4f7fc;
  --bg-soft: #eaf0f8;
  --bg-elev: #ffffff;
  --panel: #ffffff;
  --panel-2: #f2f6fc;
  --panel-solid: #ffffff;
  --line: rgba(15, 23, 42, 0.12);
  --line-strong: rgba(15, 23, 42, 0.24);
  --text: #0d1729;
  --text-soft: #24334c;
  --muted: #55647c;
  --dim: #7c8aa1;
  --accent: #0284c7;
  --accent-ink: #ffffff;
  --accent-2: #7c3aed;
  --ok: #059669;
  --warn: #b45309;
  --danger: #dc2626;
  --pink: #db2777;
  --orange: #ea580c;
  --teal: #0f766e;
  --shadow: 0 20px 50px -32px rgba(15, 23, 42, 0.35);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.noscript {
  margin: 1rem auto; max-width: 720px; padding: .8rem 1rem;
  border: 1px solid var(--warn); border-left-width: 3px; border-radius: 0 10px 10px 0;
  background: color-mix(in srgb, var(--warn) 8%, transparent); color: var(--text-soft);
  font-size: .9rem;
}

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  background:
    radial-gradient(900px 600px at 12% -10%, rgba(56, 189, 248, 0.14), transparent 62%),
    radial-gradient(800px 520px at 96% 4%, rgba(167, 139, 250, 0.13), transparent 60%),
    radial-gradient(700px 700px at 50% 120%, rgba(52, 211, 153, 0.06), transparent 65%),
    var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

[data-theme="light"] body {
  background:
    radial-gradient(900px 600px at 12% -10%, rgba(2, 132, 199, 0.10), transparent 62%),
    radial-gradient(800px 520px at 96% 4%, rgba(124, 58, 237, 0.08), transparent 60%),
    var(--bg);
}

h1, h2, h3, h4 { line-height: 1.22; letter-spacing: -0.02em; margin: 0 0 .5em; font-weight: 650; }
p { margin: 0 0 1em; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
code, kbd, pre { font-family: var(--mono); font-size: .88em; }
::selection { background: rgba(56, 189, 248, .3); }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--accent); color: var(--accent-ink); padding: .6rem 1rem; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

/* ---------- top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; gap: 1.5rem;
  padding: .7rem clamp(1rem, 3vw, 2.2rem);
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: blur(18px) saturate(1.3);
  -webkit-backdrop-filter: blur(18px) saturate(1.3);
}
.brand { display: flex; align-items: center; gap: .65rem; color: var(--text); text-decoration: none; flex: 0 0 auto; }
.brand:hover { text-decoration: none; }
.brand-mark { color: var(--accent); display: grid; place-items: center; }
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-text strong { font-size: 1rem; letter-spacing: -.01em; }
.brand-text span { font-size: .68rem; text-transform: uppercase; letter-spacing: .16em; color: var(--dim); }

.nav { display: flex; gap: .25rem; flex-wrap: wrap; }
.nav a {
  color: var(--muted); padding: .42rem .7rem; border-radius: 999px; font-size: .88rem; font-weight: 500;
  text-decoration: none; transition: color .15s, background .15s;
}
.nav a:hover { color: var(--text); background: var(--panel-2); text-decoration: none; }
.nav a.active { color: var(--text); background: var(--panel-2); box-shadow: inset 0 0 0 1px var(--line); }

.topbar-tools { margin-left: auto; display: flex; align-items: center; gap: .5rem; }

/* ---------- site-wide search ---------- */
.site-search-trigger {
  display: inline-flex; align-items: center; gap: .5rem;
  height: 36px; padding: 0 .5rem 0 .65rem; min-width: 0; flex: 0 1 250px;
  border: 1px solid var(--line-strong); border-radius: 9px;
  background: color-mix(in srgb, var(--panel-2) 65%, transparent);
  color: var(--muted); font: inherit; font-size: .8rem;
  cursor: pointer; text-align: left;
  transition: border-color .15s, background .15s, color .15s;
}
.site-search-trigger:hover { color: var(--text); border-color: var(--accent); background: var(--panel-2); }
.site-search-trigger svg { flex: 0 0 auto; color: var(--dim); }
.site-search-trigger:hover svg { color: var(--accent); }
.site-search-trigger-label { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.site-search-trigger-kbd {
  margin-left: auto; flex: 0 0 auto; font-size: .62rem; color: var(--dim);
  border: 1px solid var(--line); border-radius: 4px; padding: .04rem .28rem;
  background: color-mix(in srgb, var(--bg) 40%, transparent);
}

.site-search-dialog {
  position: fixed; inset: 0; width: 100%; height: 100%;
  max-width: none; max-height: none; margin: 0; padding: 0;
  border: 0; background: transparent; color: var(--text); overflow: hidden;
}
.site-search-dialog[open] { display: block; }
.site-search-dialog::backdrop {
  background: rgba(3, 7, 18, .72);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
}
[data-theme="light"] .site-search-dialog::backdrop { background: rgba(15, 23, 42, .38); }
.site-search-panel {
  width: min(740px, calc(100vw - 2rem));
  max-height: min(78vh, 760px);
  margin: 8vh auto 0;
  display: flex; flex-direction: column; min-height: 0;
  border: 1px solid var(--line-strong); border-radius: 16px;
  background: var(--panel-solid); box-shadow: 0 32px 90px -24px rgba(0, 0, 0, .9);
  overflow: hidden; animation: site-search-in .16s ease-out;
}
@keyframes site-search-in {
  from { opacity: 0; transform: translateY(-8px) scale(.995); }
  to { opacity: 1; transform: none; }
}
.site-search-head {
  display: flex; align-items: center; gap: .6rem;
  padding: .75rem .85rem .75rem 1rem; border-bottom: 1px solid var(--line);
}
.site-search-head:focus-within {
  box-shadow: inset 0 -2px 0 var(--accent);
  background: color-mix(in srgb, var(--panel-2) 35%, transparent);
}
.site-search-head > svg { flex: 0 0 auto; color: var(--dim); }
.site-search-input {
  flex: 1 1 auto; min-width: 0; border: 0; outline: 0;
  background: transparent; color: var(--text); font: inherit; font-size: 1rem;
}
.site-search-input:focus-visible { outline: 0; }
.site-search-input::placeholder { color: var(--dim); }
.site-search-input::-webkit-search-cancel-button { display: none; }
.site-search-close { flex: 0 0 auto; }
.site-search-status { margin: 0; padding: .45rem 1rem .1rem; font-size: .72rem; color: var(--dim); }
.site-search-results {
  flex: 1 1 auto; min-height: 72px; overflow-y: auto;
  overscroll-behavior: contain; padding: .5rem .55rem .65rem;
}
.site-search-group { padding: .1rem 0 .25rem; }
.site-search-group + .site-search-group {
  border-top: 1px solid color-mix(in srgb, var(--line) 60%, transparent);
  margin-top: .25rem;
}
.site-search-group-head {
  display: flex; align-items: center; justify-content: space-between; gap: .5rem;
  padding: .35rem .55rem .25rem; font-size: .64rem; font-weight: 650;
  letter-spacing: .1em; text-transform: uppercase; color: var(--dim);
}
.site-search-group-head span:last-child {
  font-family: var(--mono); font-weight: 500; letter-spacing: .02em;
}
.site-search-result {
  display: flex; gap: .65rem; align-items: flex-start;
  padding: .5rem .55rem; border: 1px solid transparent; border-radius: 9px;
  color: var(--text); text-decoration: none;
}
.site-search-result:hover, .site-search-result.active {
  background: var(--panel-2); border-color: var(--line); text-decoration: none;
}
.site-search-result.active { border-color: color-mix(in srgb, var(--accent) 55%, var(--line)); }
.site-search-result-icon {
  display: grid; place-items: center; flex: 0 0 auto;
  width: 27px; height: 27px; margin-top: .05rem; border-radius: 7px;
  background: color-mix(in srgb, var(--accent) 10%, var(--panel-2)); color: var(--accent);
}
.site-search-result-icon.simulations { color: var(--ok); background: color-mix(in srgb, var(--ok) 10%, var(--panel-2)); }
.site-search-result-icon.topics { color: var(--accent-2); background: color-mix(in srgb, var(--accent-2) 10%, var(--panel-2)); }
.site-search-result-icon.quiz { color: var(--warn); background: color-mix(in srgb, var(--warn) 10%, var(--panel-2)); }
.site-search-result-icon.pages { color: var(--muted); background: var(--panel-2); }
.site-search-copy { display: flex; flex-direction: column; gap: .08rem; min-width: 0; }
.site-search-title { font-size: .86rem; font-weight: 600; line-height: 1.3; color: var(--text); }
.site-search-meta { font-size: .64rem; letter-spacing: .05em; text-transform: uppercase; color: var(--dim); }
.site-search-snippet {
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
  font-size: .76rem; line-height: 1.45; color: var(--muted);
}
.site-search-snippet mark {
  background: color-mix(in srgb, var(--warn) 32%, transparent);
  color: var(--text); padding: 0 .12em; border-radius: 3px;
}
.site-search-idle, .site-search-empty { padding: 1rem 1rem 1.2rem; }
.site-search-idle-title, .site-search-empty strong { display: block; margin-bottom: .2rem; font-size: .9rem; color: var(--text); }
.site-search-idle p, .site-search-empty p { margin: 0 0 .7rem; font-size: .78rem; }
.site-search-suggestions { display: flex; flex-wrap: wrap; gap: .35rem; }
.site-search-suggestion {
  font: inherit; font-size: .72rem; color: var(--text-soft);
  background: var(--panel-2); border: 1px solid var(--line-strong);
  border-radius: 999px; padding: .22rem .55rem; cursor: pointer;
}
.site-search-suggestion:hover { color: var(--text); border-color: var(--accent); }
.site-search-loading {
  display: flex; align-items: center; gap: .5rem;
  padding: .6rem .6rem .4rem; font-size: .76rem; color: var(--dim);
}
.site-search-loading .spinner { width: 14px; height: 14px; }
.site-search-foot {
  display: flex; align-items: center; gap: .9rem; flex-wrap: wrap;
  padding: .5rem .9rem; border-top: 1px solid var(--line);
  font-size: .64rem; color: var(--dim);
}
.site-search-foot kbd { font-size: .62rem; }
html.search-open { overflow: hidden; }

/* ---------- buttons / pills ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .45rem;
  font: inherit; font-size: .86rem; font-weight: 560;
  padding: .5rem .9rem; border-radius: 9px; cursor: pointer;
  border: 1px solid var(--line-strong); background: var(--panel-2); color: var(--text);
  transition: transform .12s ease, background .15s, border-color .15s, box-shadow .15s;
  white-space: nowrap; text-decoration: none;
}
.btn:hover { background: var(--panel); border-color: var(--accent); color: var(--text); text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.btn-primary { background: linear-gradient(180deg, var(--accent), #0ea5e9); color: var(--accent-ink); border-color: transparent; box-shadow: 0 10px 30px -14px rgba(56, 189, 248, .9); }
.btn-primary:hover { background: linear-gradient(180deg, #7dd3fc, var(--accent)); color: var(--accent-ink); border-color: transparent; }
.btn-ghost { background: transparent; }
.btn-sm { font-size: .78rem; padding: .34rem .62rem; border-radius: 7px; }
.btn-icon { padding: .45rem; border-radius: 9px; background: transparent; border-color: transparent; color: var(--muted); }
.btn-icon:hover { color: var(--text); background: var(--panel-2); border-color: var(--line); }
.btn[disabled] { opacity: .4; cursor: not-allowed; }
.btn[disabled]:hover { border-color: var(--line-strong); background: var(--panel-2); }

.pill {
  display: inline-flex; align-items: center; gap: .35rem;
  font-size: .7rem; font-weight: 650; letter-spacing: .06em; text-transform: uppercase;
  padding: .2rem .55rem; border-radius: 999px;
  border: 1px solid var(--line-strong); color: var(--muted); background: var(--panel-2);
}
.pill.accent { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 45%, transparent); background: color-mix(in srgb, var(--accent) 12%, transparent); }
.pill.ok { color: var(--ok); border-color: color-mix(in srgb, var(--ok) 40%, transparent); background: color-mix(in srgb, var(--ok) 10%, transparent); }
.pill.warn { color: var(--warn); border-color: color-mix(in srgb, var(--warn) 40%, transparent); background: color-mix(in srgb, var(--warn) 10%, transparent); }
.pill.danger { color: var(--danger); border-color: color-mix(in srgb, var(--danger) 40%, transparent); background: color-mix(in srgb, var(--danger) 10%, transparent); }
.pill.violet { color: var(--accent-2); border-color: color-mix(in srgb, var(--accent-2) 45%, transparent); background: color-mix(in srgb, var(--accent-2) 12%, transparent); }

/* ---------- layout ---------- */
.view { max-width: var(--maxw); margin: 0 auto; padding: clamp(1.4rem, 3vw, 2.6rem) clamp(1rem, 3vw, 2.2rem) 3rem; outline: none; }
.view.narrow { max-width: 900px; }
.section-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 1rem; margin: 2.2rem 0 1rem; flex-wrap: wrap; }
.section-head h2 { margin: 0; font-size: clamp(1.25rem, 2.4vw, 1.6rem); }
.section-head p { margin: 0; color: var(--muted); font-size: .92rem; max-width: 60ch; }
.eyebrow { font-size: .72rem; text-transform: uppercase; letter-spacing: .18em; color: var(--accent); font-weight: 700; margin-bottom: .6rem; }

/* ---------- hero ---------- */
.hero { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr); gap: clamp(1.5rem, 4vw, 3rem); align-items: center; padding: 1rem 0 2rem; }
.hero h1 { font-size: clamp(2rem, 4.4vw, 3.4rem); letter-spacing: -.035em; margin-bottom: .6rem; }
.hero h1 em { font-style: normal; background: linear-gradient(100deg, var(--accent), var(--accent-2) 70%); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-lede { font-size: clamp(1rem, 1.5vw, 1.12rem); color: var(--text-soft); max-width: 58ch; }
.hero-actions { display: flex; gap: .6rem; flex-wrap: wrap; margin-top: 1.4rem; }
.hero-stats { display: flex; gap: 1.8rem; margin-top: 2rem; flex-wrap: wrap; }
.hero-stat strong { display: block; font-size: 1.4rem; letter-spacing: -.03em; }
.hero-stat span { font-size: .76rem; color: var(--dim); text-transform: uppercase; letter-spacing: .1em; }

/* ---------- deployment stamp ---------- */
.deploy-status { display: flex; gap: .4rem; align-items: center; flex-wrap: wrap; margin: -.3rem 0 1.8rem; }
.deploy-status .pill { text-transform: none; letter-spacing: .02em; font-weight: 500; gap: .25rem; }
.deploy-status .pill strong,
.deploy-status .pill time { color: var(--text); font-family: var(--mono); font-weight: 600; font-size: .72rem; }
.deploy-status .pill a { color: inherit; }
.build-stamp { word-break: break-word; }
.build-stamp a { color: inherit; }
.build-stamp time { font-family: var(--mono); color: var(--text); }

/* ---------- topics / learning hub ---------- */
.topic-grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.topic-card { display: flex; flex-direction: column; gap: 0; padding: 0; border-top: 3px solid var(--accent); transition: transform .18s ease, border-color .18s ease; }
.topic-card:hover { transform: translateY(-3px); border-color: var(--line-strong); }
.topic-card.ok { border-top-color: var(--ok); }
.topic-card.orange { border-top-color: var(--orange); }
.topic-card.violet { border-top-color: var(--accent-2); }
.topic-card.teal { border-top-color: var(--teal); }
.topic-card.pink { border-top-color: var(--pink); }
.topic-card-main { display: flex; flex: 1; flex-direction: column; gap: .55rem; padding: 1.15rem 1.2rem; color: inherit; text-decoration: none; transition: background .18s ease; }
.topic-card-main:hover { background: color-mix(in srgb, var(--accent) 4%, transparent); }
.topic-card-head { display: flex; align-items: center; justify-content: space-between; gap: .6rem; }
.topic-card h3 { font-size: 1.08rem; margin: .1rem 0 0; }
.topic-card p { margin: 0; }
.topic-cta { display: inline-flex; align-items: center; gap: .35rem; color: var(--accent); font-size: .78rem; font-weight: 650; margin-top: auto; padding-top: .7rem; }
.topic-project-mini { display: flex; flex-direction: column; gap: .16rem; padding: .8rem 1.2rem .9rem; border-top: 1px solid var(--line); background: color-mix(in srgb, var(--accent) 4%, var(--panel-2)); color: var(--text); text-decoration: none; transition: background .18s ease; }
.topic-project-mini:hover { background: color-mix(in srgb, var(--accent) 8%, var(--panel-2)); }
.topic-project-mini-head { display: inline-flex; align-items: center; gap: .32rem; color: var(--dim); font-size: .6rem; font-weight: 650; letter-spacing: .1em; text-transform: uppercase; }
.topic-project-mini strong { font-size: .84rem; line-height: 1.2; }
.topic-project-mini-label { color: var(--muted); font-size: .66rem; }
.topic-project-mini p { margin: .18rem 0 .1rem; color: var(--muted); font-size: .72rem; line-height: 1.4; }
.topic-project-mini .topic-project-link { color: var(--accent); font-size: .7rem; }
.topic-project-mini.ok { background: color-mix(in srgb, var(--ok) 4%, var(--panel-2)); }
.topic-project-mini.ok:hover { background: color-mix(in srgb, var(--ok) 8%, var(--panel-2)); }
.topic-project-mini.ok .topic-project-link { color: var(--ok); }
.topic-project-mini.orange { background: color-mix(in srgb, var(--orange) 4%, var(--panel-2)); }
.topic-project-mini.orange:hover { background: color-mix(in srgb, var(--orange) 8%, var(--panel-2)); }
.topic-project-mini.orange .topic-project-link { color: var(--orange); }
.topic-project-mini.violet { background: color-mix(in srgb, var(--accent-2) 4%, var(--panel-2)); }
.topic-project-mini.violet:hover { background: color-mix(in srgb, var(--accent-2) 8%, var(--panel-2)); }
.topic-project-mini.violet .topic-project-link { color: var(--accent-2); }
.topic-project-mini.teal { background: color-mix(in srgb, var(--teal) 4%, var(--panel-2)); }
.topic-project-mini.teal:hover { background: color-mix(in srgb, var(--teal) 8%, var(--panel-2)); }
.topic-project-mini.teal .topic-project-link { color: var(--teal); }
.topic-project-mini.pink { background: color-mix(in srgb, var(--pink) 4%, var(--panel-2)); }
.topic-project-mini.pink:hover { background: color-mix(in srgb, var(--pink) 8%, var(--panel-2)); }
.topic-project-mini.pink .topic-project-link { color: var(--pink); }
.topic-project-mini.is-note { background: var(--panel-2); cursor: default; }
.topic-project-mini.is-note:hover { background: var(--panel-2); }
.topic-project-mini.is-note strong { color: var(--muted); }
.topic-icon { width: 42px; height: 42px; border-radius: 12px; display: grid; place-items: center; color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, transparent); border: 1px solid color-mix(in srgb, var(--accent) 28%, transparent); flex: 0 0 auto; }
.topic-card.ok .topic-icon { color: var(--ok); background: color-mix(in srgb, var(--ok) 12%, transparent); border-color: color-mix(in srgb, var(--ok) 28%, transparent); }
.topic-card.orange .topic-icon { color: var(--orange); background: color-mix(in srgb, var(--orange) 12%, transparent); border-color: color-mix(in srgb, var(--orange) 28%, transparent); }
.topic-card.violet .topic-icon { color: var(--accent-2); background: color-mix(in srgb, var(--accent-2) 12%, transparent); border-color: color-mix(in srgb, var(--accent-2) 28%, transparent); }
.topic-card.teal .topic-icon { color: var(--teal); background: color-mix(in srgb, var(--teal) 12%, transparent); border-color: color-mix(in srgb, var(--teal) 28%, transparent); }
.topic-card.pink .topic-icon { color: var(--pink); background: color-mix(in srgb, var(--pink) 12%, transparent); border-color: color-mix(in srgb, var(--pink) 28%, transparent); }

.lab-hero { align-items: center; }
.lab-art { min-height: 290px; display: grid; place-items: center; position: relative; }
.lab-art::before { content: ""; position: absolute; inset: 0; background: radial-gradient(closest-side, color-mix(in srgb, var(--accent) 16%, transparent), transparent 72%); filter: blur(20px); z-index: 0; }
.lab-art-orbit { position: relative; z-index: 1; display: flex; gap: .8rem; flex-wrap: wrap; justify-content: center; max-width: 560px; }
.lab-art-topic { display: flex; flex-direction: column; align-items: center; gap: .3rem; width: 128px; padding: .9rem .6rem; border: 1px solid var(--line-strong); border-radius: 14px; background: color-mix(in srgb, var(--bg-elev) 85%, transparent); box-shadow: var(--shadow); }
.lab-art-topic span { color: var(--accent); }
.lab-art-topic.ok span { color: var(--ok); }
.lab-art-topic.orange span { color: var(--orange); }
.lab-art-topic.violet span { color: var(--accent-2); }
.lab-art-topic.teal span { color: var(--teal); }
.lab-art-topic.pink span { color: var(--pink); }
.lab-art-topic strong { font-size: .88rem; }
.lab-art-topic small { color: var(--dim); font-size: .68rem; }
.lab-art > p { position: relative; z-index: 1; margin: 1rem 0 0; color: var(--dim); font-size: .72rem; text-align: center; }

.topic-hero { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 2rem; align-items: start; padding: 1rem 0 2rem; border-top: 3px solid var(--accent); }
.topic-hero.ok { border-top-color: var(--ok); }
.topic-hero.orange { border-top-color: var(--orange); }
.topic-hero.violet { border-top-color: var(--accent-2); }
.topic-hero.teal { border-top-color: var(--teal); }
.topic-hero.pink { border-top-color: var(--pink); }
.topic-hero-copy h1 { font-size: clamp(1.8rem, 3.4vw, 2.7rem); margin: .2rem 0 .6rem; }
.topic-hero .topic-icon { margin-bottom: .8rem; }
.topic-hero-copy .page-lede { max-width: 70ch; }
.topic-outcomes { margin-top: 1.4rem; }
.topic-outcomes h2 { font-size: .72rem; text-transform: uppercase; letter-spacing: .12em; color: var(--accent); margin-bottom: .5rem; }
.topic-outcomes ul { margin: 0; padding-left: 1.2rem; color: var(--text-soft); font-size: .86rem; }
.topic-outcomes li { margin: .25rem 0; }
.topic-side { border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); padding: 1rem; }
.topic-stats { display: flex; gap: 1rem; flex-wrap: wrap; margin-bottom: .8rem; }
.topic-stats div { min-width: 70px; }
.topic-stats strong { display: block; font-size: 1.4rem; letter-spacing: -.03em; }
.topic-stats span { display: block; color: var(--dim); font-size: .66rem; text-transform: uppercase; letter-spacing: .08em; }
.topic-side .dim { font-size: .74rem; margin: .6rem 0 .8rem; }
.topic-links { display: flex; gap: .4rem; flex-wrap: wrap; }
.topic-project {
  display: flex; flex-direction: column; gap: .22rem; margin-top: 1rem; padding: .85rem .9rem;
  border: 1px solid var(--line); border-left: 3px solid var(--accent); border-radius: 12px;
  background: color-mix(in srgb, var(--accent) 5%, var(--panel)); color: var(--text);
  text-decoration: none; transition: transform .15s ease, border-color .15s ease, background .15s ease;
}
.topic-project:hover { transform: translateY(-1px); border-color: color-mix(in srgb, var(--accent) 45%, var(--line)); background: color-mix(in srgb, var(--accent) 8%, var(--panel)); }
.topic-project.ok { border-left-color: var(--ok); background: color-mix(in srgb, var(--ok) 5%, var(--panel)); }
.topic-project.ok:hover { border-color: color-mix(in srgb, var(--ok) 45%, var(--line)); background: color-mix(in srgb, var(--ok) 8%, var(--panel)); }
.topic-project.orange { border-left-color: var(--orange); background: color-mix(in srgb, var(--orange) 5%, var(--panel)); }
.topic-project.orange:hover { border-color: color-mix(in srgb, var(--orange) 45%, var(--line)); background: color-mix(in srgb, var(--orange) 8%, var(--panel)); }
.topic-project.violet { border-left-color: var(--accent-2); background: color-mix(in srgb, var(--accent-2) 5%, var(--panel)); }
.topic-project.violet:hover { border-color: color-mix(in srgb, var(--accent-2) 45%, var(--line)); background: color-mix(in srgb, var(--accent-2) 8%, var(--panel)); }
.topic-project.teal { border-left-color: var(--teal); background: color-mix(in srgb, var(--teal) 5%, var(--panel)); }
.topic-project.teal:hover { border-color: color-mix(in srgb, var(--teal) 45%, var(--line)); background: color-mix(in srgb, var(--teal) 8%, var(--panel)); }
.topic-project.pink { border-left-color: var(--pink); background: color-mix(in srgb, var(--pink) 5%, var(--panel)); }
.topic-project.pink:hover { border-color: color-mix(in srgb, var(--pink) 45%, var(--line)); background: color-mix(in srgb, var(--pink) 8%, var(--panel)); }
.topic-project-eyebrow { display: inline-flex; align-items: center; gap: .35rem; color: var(--dim); font-size: .62rem; font-weight: 600; letter-spacing: .1em; text-transform: uppercase; }
.topic-project strong { font-size: .92rem; line-height: 1.2; }
.topic-project-label { color: var(--muted); font-size: .7rem; }
.topic-project-url { color: var(--dim); font-family: var(--mono); font-size: .62rem; word-break: break-all; }
.topic-project p { margin: .18rem 0 .2rem; color: var(--muted); font-size: .76rem; line-height: 1.42; }
.topic-project ul { margin: .05rem 0 .3rem; padding-left: 1.05rem; color: var(--muted); font-size: .72rem; line-height: 1.45; }
.topic-project li { margin: .14rem 0; }
.topic-project-link { display: inline-flex; align-items: center; gap: .3rem; margin-top: .15rem; color: var(--accent); font-size: .74rem; font-weight: 600; }
.topic-project.ok .topic-project-link { color: var(--ok); }
.topic-project.orange .topic-project-link { color: var(--orange); }
.topic-project.violet .topic-project-link { color: var(--accent-2); }
.topic-project.teal .topic-project-link { color: var(--teal); }
.topic-project.pink .topic-project-link { color: var(--pink); }

.topic-learn-block { border-bottom: 1px solid var(--line); padding-bottom: 1.4rem; }
.topic-learn-head { margin-bottom: .8rem; }
.topic-learn-head .chapter-head { margin-bottom: .3rem; }
.topic-learn-head .chapter-head h2 { display: flex; align-items: center; gap: .5rem; }
.topic-learn-head p { color: var(--muted); font-size: .86rem; margin: 0 0 .5rem; }
.topic-mini-icon { width: 28px; height: 28px; display: inline-grid; place-items: center; border-radius: 8px; color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, transparent); }
.topic-mini-icon.ok { color: var(--ok); background: color-mix(in srgb, var(--ok) 12%, transparent); }
.topic-mini-icon.orange { color: var(--orange); background: color-mix(in srgb, var(--orange) 12%, transparent); }
.topic-mini-icon.violet { color: var(--accent-2); background: color-mix(in srgb, var(--accent-2) 12%, transparent); }
.topic-mini-icon.teal { color: var(--teal); background: color-mix(in srgb, var(--teal) 12%, transparent); }
.topic-mini-icon.pink { color: var(--pink); background: color-mix(in srgb, var(--pink) 12%, transparent); }


/* ---------- cards ---------- */
.cards { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.card {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.15rem 1.2rem; box-shadow: var(--shadow); position: relative; overflow: hidden;
  transition: transform .18s ease, border-color .18s ease, background .18s;
}
a.card { color: inherit; text-decoration: none; display: block; }
a.card:hover { text-decoration: none; transform: translateY(-3px); border-color: var(--line-strong); background: var(--panel-2); }
.card h3 { font-size: 1rem; margin-bottom: .35rem; }
.card p { font-size: .88rem; color: var(--muted); margin: 0; }
.card .card-meta { display: flex; gap: .4rem; flex-wrap: wrap; margin-top: .9rem; }
.card-icon { width: 34px; height: 34px; border-radius: 9px; display: grid; place-items: center; margin-bottom: .8rem;
  background: color-mix(in srgb, var(--accent) 14%, transparent); color: var(--accent); border: 1px solid color-mix(in srgb, var(--accent) 25%, transparent); }

/* ---------- prose ---------- */
.prose { max-width: 78ch; min-width: 0; font-size: .98rem; color: var(--text-soft); }
.prose > *:first-child { margin-top: 0; }
.prose h2 { font-size: clamp(1.3rem, 2.2vw, 1.6rem); margin: 2.2em 0 .7em; padding-top: .3em; color: var(--text); scroll-margin-top: 90px; }
.prose h2::before { content: ""; display: block; width: 42px; height: 2px; background: linear-gradient(90deg, var(--accent), transparent); margin-bottom: .7rem; border-radius: 2px; }
.prose h3 { font-size: 1.08rem; margin: 1.8em 0 .5em; color: var(--text); scroll-margin-top: 90px; }
.prose h4 { font-size: .95rem; margin: 1.4em 0 .4em; color: var(--text); text-transform: uppercase; letter-spacing: .08em; font-size: .78rem; color: var(--accent); }
.prose ul, .prose ol { padding-left: 1.3rem; margin: 0 0 1.1em; }
.prose li { margin: .3em 0; }
.prose li::marker { color: var(--accent); }
.prose strong { color: var(--text); font-weight: 650; }
.prose em { color: var(--text); }
.prose code:not(pre code) {
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 20%, transparent);
  color: var(--text); padding: .08em .38em; border-radius: 5px; font-size: .86em; white-space: nowrap;
}
.prose pre {
  background: var(--bg-soft); border: 1px solid var(--line); border-radius: 12px;
  padding: 1rem 1.1rem; overflow: auto; margin: 0 0 1.3em; line-height: 1.5; font-size: .8rem;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.03);
}
.prose pre code { color: var(--text-soft); white-space: pre; }
.prose blockquote {
  margin: 0 0 1.2em; padding: .8rem 1.1rem; border-left: 3px solid var(--accent);
  background: color-mix(in srgb, var(--accent) 7%, transparent); border-radius: 0 10px 10px 0; color: var(--text-soft);
}
.prose blockquote p:last-child { margin: 0; }
.prose table { width: 100%; border-collapse: collapse; margin: 0 0 1.4em; font-size: .86rem; display: block; overflow-x: auto; }
.prose th, .prose td { text-align: left; padding: .55rem .7rem; border-bottom: 1px solid var(--line); vertical-align: top; }
.prose th { color: var(--text); font-weight: 650; background: var(--panel-2); white-space: nowrap; }
.prose tr:hover td { background: color-mix(in srgb, var(--accent) 4%, transparent); }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 2em 0; }
.prose img { max-width: 100%; border-radius: 10px; }

/* ---------- doc page ---------- */
.doc-toc { position: sticky; top: 82px; font-size: .84rem; border-left: 1px solid var(--line); padding-left: 1rem; max-height: calc(100vh - 120px); overflow: auto; }
.doc-toc h4 { font-size: .7rem; text-transform: uppercase; letter-spacing: .12em; color: var(--dim); margin-bottom: .6rem; }
.doc-toc a { display: block; color: var(--muted); padding: .22rem 0; text-decoration: none; line-height: 1.35; }
.doc-toc a:hover { color: var(--accent); }
.doc-toc a.lvl3 { padding-left: .8rem; font-size: .8rem; color: var(--dim); }
.doc-nav { display: flex; justify-content: space-between; gap: 1rem; margin-top: 3rem; padding-top: 1.4rem; border-top: 1px solid var(--line); }
.doc-nav a { display: block; max-width: 46%; }
.doc-nav .dir { display: block; font-size: .7rem; text-transform: uppercase; letter-spacing: .12em; color: var(--dim); }
.doc-nav .ttl { color: var(--text); font-weight: 600; }
.doc-nav a:hover .ttl { color: var(--accent); }

/* ---------- scenario list ---------- */
.filters { display: flex; gap: .4rem; flex-wrap: wrap; margin-bottom: 1.2rem; }
.filter {
  font: inherit; font-size: .8rem; padding: .35rem .8rem; border-radius: 999px; cursor: pointer;
  background: transparent; border: 1px solid var(--line); color: var(--muted); transition: all .15s;
}
.filter:hover { color: var(--text); border-color: var(--line-strong); }
.filter.active { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); font-weight: 600; }
.scenario-grid { display: grid; gap: .9rem; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }
.scenario-card { display: flex; flex-direction: column; gap: .5rem; }
.scenario-card h3 { font-size: .97rem; margin: 0; }
.scenario-card p { margin: 0; }
.scenario-card .flowline { font-family: var(--mono); font-size: .72rem; color: var(--dim); margin-top: .35rem; }
.scenario-card .card-meta { margin-top: auto; padding-top: .8rem; }

/* ---------- simulation ---------- */
.sim-head { display: flex; gap: 1rem; align-items: flex-start; justify-content: space-between; flex-wrap: wrap; margin-bottom: .9rem; }
.sim-head h1 { font-size: clamp(1.35rem, 2.6vw, 1.9rem); margin: 0 0 .3rem; }
.sim-head p { margin: 0; color: var(--muted); max-width: 80ch; font-size: .92rem; }
.sim-head .pills { display: flex; gap: .35rem; flex-wrap: wrap; margin-bottom: .5rem; }

.controls {
  display: flex; align-items: center; gap: .5rem; flex-wrap: wrap;
  padding: .6rem .75rem; border: 1px solid var(--line); border-radius: 12px;
  background: var(--panel); margin-bottom: .8rem;
}
.controls .spacer { flex: 1 1 auto; }
.controls .counter { font-family: var(--mono); font-size: .78rem; color: var(--muted); white-space: nowrap; }
.controls label { font-size: .76rem; color: var(--dim); display: flex; align-items: center; gap: .35rem; }
select.control, .control-select {
  font: inherit; font-size: .78rem; background: var(--bg-elev); color: var(--text);
  border: 1px solid var(--line-strong); border-radius: 7px; padding: .3rem .5rem;
}
.seg { display: inline-flex; border: 1px solid var(--line-strong); border-radius: 8px; overflow: hidden; }
.seg button {
  font: inherit; font-size: .75rem; padding: .3rem .6rem; background: transparent; border: 0; color: var(--muted); cursor: pointer;
}
.seg button.active { background: var(--accent); color: var(--accent-ink); font-weight: 650; }
.seg button:not(.active):hover { background: var(--panel-2); color: var(--text); }

.progress-track { height: 3px; background: var(--line); border-radius: 3px; overflow: hidden; margin-bottom: .9rem; }
.progress-fill { height: 100%; width: 0%; background: linear-gradient(90deg, var(--accent), var(--accent-2)); border-radius: 3px; transition: width .45s cubic-bezier(.2,.7,.3,1); }

.sim-shell { display: grid; grid-template-columns: minmax(0, 1fr) 310px; gap: 1rem; align-items: start; }
.sim-main { min-width: 0; }
.sim-rail { display: flex; flex-direction: column; gap: 1rem; position: sticky; top: 80px; }

/* ---- stage ---- */
.stage-wrap { border: 1px solid var(--line); border-radius: var(--radius); background:
  radial-gradient(700px 400px at 50% 40%, rgba(56,189,248,.07), transparent 70%), var(--bg-soft);
  overflow: hidden; position: relative; box-shadow: var(--shadow); }
.stage-scroll { overflow-x: auto; overflow-y: hidden; }
.stage { position: relative; width: 100%; min-width: 860px; aspect-ratio: 1000 / 600; }
.stage-grid {
  position: absolute; inset: 0; opacity: .5; pointer-events: none;
  background-image: linear-gradient(rgba(148,163,184,.07) 1px, transparent 1px), linear-gradient(90deg, rgba(148,163,184,.07) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 45%, #000 55%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 45%, #000 55%, transparent 100%);
}
.wires { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.wire { fill: none; stroke: var(--line-strong); stroke-width: 1.4; opacity: .55; }
.wire.is-active { stroke: var(--accent); stroke-width: 2.2; opacity: 1; stroke-dasharray: 7 6; animation: dashflow 1s linear infinite; filter: drop-shadow(0 0 6px rgba(56,189,248,.7)); }
.wire.is-done { opacity: .3; }
@keyframes dashflow { to { stroke-dashoffset: -13; } }
[data-channel="back"] .wire.is-active, .wire.is-active.ch-back { stroke: var(--ok); filter: drop-shadow(0 0 6px rgba(52,211,153,.6)); }
.wire.is-active.ch-cookie { stroke: var(--warn); filter: drop-shadow(0 0 6px rgba(251,191,36,.6)); }
.wire.is-active.ch-attr { stroke: var(--accent-2); filter: drop-shadow(0 0 6px rgba(167,139,250,.6)); }
.wire.is-active.ch-internal { stroke: var(--dim); filter: none; }
.wire.is-active.ch-saml { stroke: var(--orange); filter: drop-shadow(0 0 6px rgba(251,146,60,.6)); }
.wire.is-active.ch-cli { stroke: var(--accent); filter: drop-shadow(0 0 6px rgba(56,189,248,.6)); }
.wire.is-active.ch-engine { stroke: var(--ok); filter: drop-shadow(0 0 6px rgba(52,211,153,.6)); }
.wire.is-active.ch-network { stroke: var(--teal); filter: drop-shadow(0 0 6px rgba(45,212,191,.55)); }
.wire.is-active.ch-dns { stroke: var(--teal); filter: drop-shadow(0 0 6px rgba(45,212,191,.55)); }
.wire.is-active.ch-dnssec { stroke: var(--accent-2); filter: drop-shadow(0 0 6px rgba(167,139,250,.6)); }
.wire.is-active.ch-xfer { stroke: var(--orange); filter: drop-shadow(0 0 6px rgba(251,146,60,.6)); }
.wire.is-active.ch-update { stroke: var(--pink); filter: drop-shadow(0 0 6px rgba(244,114,182,.6)); }
.wire.is-active.ch-registry { stroke: var(--accent-2); filter: drop-shadow(0 0 6px rgba(167,139,250,.6)); }
.wire.is-active.ch-git { stroke: var(--orange); filter: drop-shadow(0 0 6px rgba(251,146,60,.6)); }
.wire.is-active.ch-ci { stroke: var(--pink); filter: drop-shadow(0 0 6px rgba(244,114,182,.6)); }
.wire.is-active.ch-deploy { stroke: var(--warn); filter: drop-shadow(0 0 6px rgba(251,191,36,.6)); }
.wire.is-active.ch-host { stroke: var(--warn); filter: drop-shadow(0 0 6px rgba(251,191,36,.55)); }
.wire.is-active.ch-storage { stroke: var(--accent-2); filter: drop-shadow(0 0 6px rgba(167,139,250,.6)); }
.wire.is-active.ch-guest { stroke: var(--teal); filter: drop-shadow(0 0 6px rgba(45,212,191,.55)); }
.wire.is-active.ch-report { stroke: var(--ok); filter: drop-shadow(0 0 6px rgba(52,211,153,.6)); }

.node {
  position: absolute; transform: translate(-50%, -50%);
  width: 168px; padding: .6rem .7rem; border-radius: 13px;
  background: var(--panel); border: 1px solid var(--line-strong);
  display: flex; flex-direction: column; gap: .15rem; text-align: center; align-items: center;
  transition: opacity .35s, border-color .35s, box-shadow .35s, transform .35s, background .35s;
  backdrop-filter: blur(6px);
  z-index: 2;
}
.node-icon { width: 26px; height: 26px; color: var(--muted); margin-bottom: .1rem; transition: color .3s, transform .3s; }
.node-name { font-size: .8rem; font-weight: 650; letter-spacing: -.01em; }
.node-sub { font-size: .65rem; color: var(--dim); line-height: 1.3; }
.node.is-idle { opacity: .4; filter: grayscale(.6); }
.node.is-idle::after { content: "not used here"; position: absolute; top: -9px; right: -6px; font-size: .55rem; letter-spacing: .04em; text-transform: uppercase;
  background: var(--bg-elev); border: 1px solid var(--line); color: var(--dim); padding: .05rem .35rem; border-radius: 999px; }
.node.is-active { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 10%, var(--panel)); box-shadow: 0 0 0 1px color-mix(in srgb, var(--accent) 35%, transparent), 0 0 34px -6px rgba(56,189,248,.45); transform: translate(-50%, -50%) scale(1.035); }
.node.is-active .node-icon { color: var(--accent); }
.node.is-target { border-color: var(--accent-2); box-shadow: 0 0 0 1px color-mix(in srgb, var(--accent-2) 40%, transparent), 0 0 30px -8px rgba(167,139,250,.5); }
.node.is-active.is-target .node-icon { color: var(--accent-2); }
.node .node-pulse { position: absolute; inset: -1px; border-radius: 13px; border: 1px solid var(--accent); opacity: 0; pointer-events: none; }
.node.is-active .node-pulse { animation: nodepulse 2.4s ease-out infinite; }
@keyframes nodepulse {
  0% { opacity: .55; transform: scale(1); }
  70%, 100% { opacity: 0; transform: scale(1.14); }
}

/* OneGate container */
.og-box {
  position: absolute; transform: translate(-50%, -50%);
  border: 1px solid color-mix(in srgb, var(--accent-2) 32%, transparent);
  border-radius: 20px; background: linear-gradient(180deg, color-mix(in srgb, var(--accent-2) 8%, transparent), transparent 70%);
  z-index: 1; transition: border-color .4s, box-shadow .4s;
}
.og-box.is-active { border-color: color-mix(in srgb, var(--accent-2) 65%, transparent); box-shadow: inset 0 0 60px -30px rgba(167,139,250,.6), 0 0 40px -20px rgba(167,139,250,.35); }
.og-title { position: absolute; top: -11px; left: 18px; padding: 0 .5rem; background: var(--bg-soft); border-radius: 6px;
  font-size: .68rem; letter-spacing: .16em; text-transform: uppercase; color: var(--accent-2); font-weight: 700; white-space: nowrap; }
.og-title span { color: var(--dim); letter-spacing: .04em; font-weight: 500; text-transform: none; font-size: .66rem; }
.og-foot { position: absolute; bottom: 8px; left: 0; right: 0; text-align: center; font-size: .6rem; color: var(--dim); letter-spacing: .06em; }
.subnode {
  position: absolute; transform: translate(-50%, -50%);
  width: 124px; padding: .35rem .3rem; border-radius: 9px; text-align: center;
  border: 1px solid var(--line); background: color-mix(in srgb, var(--bg-elev) 85%, transparent);
  transition: all .35s; z-index: 3; display: flex; flex-direction: column; gap: .05rem; align-items: center;
}
.subnode .sn-name { font-size: .68rem; font-weight: 650; letter-spacing: -.01em; }
.subnode .sn-sub { font-size: .56rem; color: var(--dim); line-height: 1.25; }
.subnode .sn-dot { width: 5px; height: 5px; border-radius: 50%; background: var(--line-strong); margin-bottom: .15rem; transition: background .3s, box-shadow .3s; }
.subnode.is-idle { opacity: .35; }
.subnode.is-active { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, var(--bg-elev)); box-shadow: 0 0 22px -8px rgba(56,189,248,.7); }
.subnode.is-active .sn-dot { background: var(--accent); box-shadow: 0 0 8px var(--accent); }
.subnode.is-target { border-color: var(--accent-2); }
.subnode.is-target .sn-dot { background: var(--accent-2); box-shadow: 0 0 8px var(--accent-2); }

/* packets */
.packet {
  position: absolute; top: 0; left: 0; transform: translate(-50%, -50%);
  display: flex; align-items: center; gap: .3rem;
  padding: .18rem .45rem .18rem .3rem; border-radius: 999px; white-space: nowrap;
  font-family: var(--mono); font-size: .6rem; font-weight: 600; letter-spacing: .01em;
  background: var(--bg-elev); border: 1px solid var(--accent); color: var(--text);
  box-shadow: 0 0 0 3px rgba(56,189,248,.12), 0 6px 22px -6px rgba(0,0,0,.8);
  z-index: 6; pointer-events: none; will-change: transform, left, top;
}
.packet .pk-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 8px var(--accent); flex: 0 0 auto; }
.packet.ch-back { border-color: var(--ok); box-shadow: 0 0 0 3px rgba(52,211,153,.12), 0 6px 22px -6px rgba(0,0,0,.8); }
.packet.ch-back .pk-dot { background: var(--ok); box-shadow: 0 0 8px var(--ok); }
.packet.ch-cookie { border-color: var(--warn); }
.packet.ch-cookie .pk-dot { background: var(--warn); box-shadow: 0 0 8px var(--warn); }
.packet.ch-attr { border-color: var(--accent-2); }
.packet.ch-attr .pk-dot { background: var(--accent-2); box-shadow: 0 0 8px var(--accent-2); }
.packet.ch-internal { border-color: var(--dim); }
.packet.ch-internal .pk-dot { background: var(--dim); box-shadow: none; }
.packet.ch-saml { border-color: var(--orange); }
.packet.ch-saml .pk-dot { background: var(--orange); box-shadow: 0 0 8px var(--orange); }
.packet.ch-cli { border-color: var(--accent); }
.packet.ch-cli .pk-dot { background: var(--accent); box-shadow: 0 0 8px var(--accent); }
.packet.ch-engine { border-color: var(--ok); }
.packet.ch-engine .pk-dot { background: var(--ok); box-shadow: 0 0 8px var(--ok); }
.packet.ch-network { border-color: var(--teal); }
.packet.ch-network .pk-dot { background: var(--teal); box-shadow: 0 0 8px var(--teal); }
.packet.ch-dns { border-color: var(--teal); }
.packet.ch-dns .pk-dot { background: var(--teal); box-shadow: 0 0 8px var(--teal); }
.packet.ch-dnssec { border-color: var(--accent-2); }
.packet.ch-dnssec .pk-dot { background: var(--accent-2); box-shadow: 0 0 8px var(--accent-2); }
.packet.ch-xfer { border-color: var(--orange); }
.packet.ch-xfer .pk-dot { background: var(--orange); box-shadow: 0 0 8px var(--orange); }
.packet.ch-update { border-color: var(--pink); }
.packet.ch-update .pk-dot { background: var(--pink); box-shadow: 0 0 8px var(--pink); }
.packet.ch-registry { border-color: var(--accent-2); }
.packet.ch-registry .pk-dot { background: var(--accent-2); box-shadow: 0 0 8px var(--accent-2); }
.packet.ch-git { border-color: var(--orange); }
.packet.ch-git .pk-dot { background: var(--orange); box-shadow: 0 0 8px var(--orange); }
.packet.ch-ci { border-color: var(--pink); }
.packet.ch-ci .pk-dot { background: var(--pink); box-shadow: 0 0 8px var(--pink); }
.packet.ch-deploy { border-color: var(--warn); }
.packet.ch-deploy .pk-dot { background: var(--warn); box-shadow: 0 0 8px var(--warn); }
.packet.ch-host { border-color: var(--warn); }
.packet.ch-host .pk-dot { background: var(--warn); box-shadow: 0 0 8px var(--warn); }
.packet.ch-storage { border-color: var(--accent-2); }
.packet.ch-storage .pk-dot { background: var(--accent-2); box-shadow: 0 0 8px var(--accent-2); }
.packet.ch-guest { border-color: var(--teal); }
.packet.ch-guest .pk-dot { background: var(--teal); box-shadow: 0 0 8px var(--teal); }
.packet.ch-report { border-color: var(--ok); }
.packet.ch-report .pk-dot { background: var(--ok); box-shadow: 0 0 8px var(--ok); }

.ripple {
  position: absolute; width: 20px; height: 20px; border-radius: 50%; transform: translate(-50%,-50%);
  border: 2px solid var(--accent); pointer-events: none; z-index: 5; animation: ripple .9s ease-out forwards;
}
.ripple.ch-back { border-color: var(--ok); }
.ripple.ch-cookie { border-color: var(--warn); }
.ripple.ch-attr { border-color: var(--accent-2); }
.ripple.ch-saml { border-color: var(--orange); }
.ripple.ch-cli { border-color: var(--accent); }
.ripple.ch-engine { border-color: var(--ok); }
.ripple.ch-network { border-color: var(--teal); }
.ripple.ch-dns { border-color: var(--teal); }
.ripple.ch-dnssec { border-color: var(--accent-2); }
.ripple.ch-xfer { border-color: var(--orange); }
.ripple.ch-update { border-color: var(--pink); }
.ripple.ch-registry { border-color: var(--accent-2); }
.ripple.ch-git { border-color: var(--orange); }
.ripple.ch-ci { border-color: var(--pink); }
.ripple.ch-deploy { border-color: var(--warn); }
.ripple.ch-host { border-color: var(--warn); }
.ripple.ch-storage { border-color: var(--accent-2); }
.ripple.ch-guest { border-color: var(--teal); }
.ripple.ch-report { border-color: var(--ok); }
@keyframes ripple { from { opacity: .8; width: 14px; height: 14px; } to { opacity: 0; width: 140px; height: 140px; } }

.stage-legend { display: flex; gap: .8rem; flex-wrap: wrap; padding: .5rem .75rem; border-top: 1px solid var(--line); font-size: .68rem; color: var(--dim); background: color-mix(in srgb, var(--bg-elev) 55%, transparent); }
.stage-legend span { display: inline-flex; align-items: center; gap: .3rem; }
.lg-dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; }

/* ---- right rail ---- */
.rail-card { border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); overflow: hidden; }
.rail-head { display: flex; align-items: center; justify-content: space-between; gap: .5rem; padding: .55rem .8rem; border-bottom: 1px solid var(--line); }
.rail-head h3 { font-size: .72rem; text-transform: uppercase; letter-spacing: .12em; color: var(--muted); margin: 0; font-weight: 650; }
.rail-head .rail-hint { font-size: .62rem; color: var(--dim); }
.scenario-guide { padding: .65rem .8rem .75rem; display: flex; flex-direction: column; gap: .5rem; max-height: 30vh; overflow: auto; }
.guide-summary { margin: 0; font-size: .78rem; color: var(--text-soft); line-height: 1.45; display: -webkit-box; -webkit-line-clamp: 4; -webkit-box-orient: vertical; overflow: hidden; }
.guide-meta { display: flex; flex-wrap: wrap; gap: .25rem; }
.guide-note { border-top: 1px solid var(--line); padding-top: .4rem; }
.guide-note summary { cursor: pointer; font-size: .7rem; color: var(--accent); }
.guide-note p { margin: .3rem 0 0; font-size: .74rem; color: var(--text-soft); line-height: 1.45; }
.watch-block { margin-top: 1rem; }
.watch-block h5 { font-size: .68rem; letter-spacing: .12em; text-transform: uppercase; color: var(--accent); margin: 0 0 .45rem; }
.watch-hop { font-family: var(--mono); font-size: .68rem; color: var(--dim); margin: 0 0 .45rem; display: flex; gap: .4rem; flex-wrap: wrap; align-items: center; }
.checklist { margin: 0; padding-left: 1.1rem; font-size: .82rem; color: var(--text-soft); }
.checklist li { margin-bottom: .3rem; }

.vault { padding: .5rem; display: flex; flex-direction: column; gap: .4rem; max-height: 40vh; overflow: auto; }
.vault-store { border: 1px solid var(--line); border-radius: 9px; padding: .35rem .45rem; transition: border-color .3s, background .3s; }
.vault-store.is-focus { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 7%, transparent); }
.vault-store.is-empty { opacity: .45; }
.vs-head { display: flex; align-items: center; gap: .35rem; font-size: .66rem; font-weight: 650; color: var(--text-soft); margin-bottom: .25rem; }
.vs-head .vs-count { margin-left: auto; font-family: var(--mono); font-size: .62rem; color: var(--dim); font-weight: 400; }
.vs-head svg { width: 13px; height: 13px; color: var(--dim); }
.vault-items { display: flex; flex-wrap: wrap; gap: .22rem; }
.vchip {
  display: inline-flex; align-items: center; gap: .25rem; font-family: var(--mono); font-size: .6rem;
  padding: .12rem .38rem; border-radius: 5px; cursor: pointer; border: 1px solid; line-height: 1.4;
  animation: chipin .35s cubic-bezier(.2,1.4,.4,1);
}
@keyframes chipin { from { opacity: 0; transform: scale(.7) translateY(4px); } to { opacity: 1; transform: none; } }
.vchip .vc-dot { width: 5px; height: 5px; border-radius: 50%; background: currentColor; }
.vchip:hover { filter: brightness(1.3); }
.vault-empty { font-size: .62rem; color: var(--dim); font-style: italic; }
.k-jwt { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 35%, transparent); background: color-mix(in srgb, var(--accent) 10%, transparent); }
.k-opaque { color: var(--accent-2); border-color: color-mix(in srgb, var(--accent-2) 35%, transparent); background: color-mix(in srgb, var(--accent-2) 10%, transparent); }
.k-id { color: #2dd4bf; border-color: rgba(45,212,191,.35); background: rgba(45,212,191,.1); }
.k-rt { color: var(--warn); border-color: color-mix(in srgb, var(--warn) 35%, transparent); background: color-mix(in srgb, var(--warn) 10%, transparent); }
.k-code { color: #cbd5e1; border-color: rgba(203,213,225,.3); background: rgba(203,213,225,.08); }
.k-cookie { color: var(--pink); border-color: color-mix(in srgb, var(--pink) 35%, transparent); background: color-mix(in srgb, var(--pink) 10%, transparent); }
.k-session { color: #94a3b8; border-color: rgba(148,163,184,.3); background: rgba(148,163,184,.08); }
.k-csrf { color: #94a3b8; border-color: rgba(148,163,184,.3); background: rgba(148,163,184,.06); }
.k-saml { color: var(--orange); border-color: color-mix(in srgb, var(--orange) 35%, transparent); background: color-mix(in srgb, var(--orange) 10%, transparent); }
.k-claims { color: var(--ok); border-color: color-mix(in srgb, var(--ok) 30%, transparent); background: color-mix(in srgb, var(--ok) 8%, transparent); }
.k-jwk { color: var(--accent-2); border-color: color-mix(in srgb, var(--accent-2) 30%, transparent); background: color-mix(in srgb, var(--accent-2) 8%, transparent); }
.k-statement { color: #a78bfa; border-color: rgba(167,139,250,.35); background: rgba(167,139,250,.1); }
.k-image { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 40%, transparent); background: color-mix(in srgb, var(--accent) 10%, transparent); }
.k-container { color: var(--ok); border-color: color-mix(in srgb, var(--ok) 40%, transparent); background: color-mix(in srgb, var(--ok) 10%, transparent); }
.k-volume { color: var(--teal); border-color: color-mix(in srgb, var(--teal) 40%, transparent); background: color-mix(in srgb, var(--teal) 10%, transparent); }
.k-config { color: var(--muted); border-color: var(--line-strong); background: var(--panel-2); }
.k-layer { color: var(--accent-2); border-color: color-mix(in srgb, var(--accent-2) 40%, transparent); background: color-mix(in srgb, var(--accent-2) 10%, transparent); }
.k-git { color: var(--orange); border-color: color-mix(in srgb, var(--orange) 40%, transparent); background: color-mix(in srgb, var(--orange) 10%, transparent); }
.k-tag { color: var(--warn); border-color: color-mix(in srgb, var(--warn) 40%, transparent); background: color-mix(in srgb, var(--warn) 10%, transparent); }
.k-workflow { color: var(--pink); border-color: color-mix(in srgb, var(--pink) 40%, transparent); background: color-mix(in srgb, var(--pink) 10%, transparent); }
.k-network { color: var(--teal); border-color: color-mix(in srgb, var(--teal) 40%, transparent); background: color-mix(in srgb, var(--teal) 10%, transparent); }
.k-request { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 40%, transparent); background: color-mix(in srgb, var(--accent) 10%, transparent); }
.k-response { color: var(--ok); border-color: color-mix(in srgb, var(--ok) 40%, transparent); background: color-mix(in srgb, var(--ok) 10%, transparent); }
.k-cert { color: var(--accent-2); border-color: color-mix(in srgb, var(--accent-2) 40%, transparent); background: color-mix(in srgb, var(--accent-2) 10%, transparent); }
.k-acl { color: var(--orange); border-color: color-mix(in srgb, var(--orange) 40%, transparent); background: color-mix(in srgb, var(--orange) 10%, transparent); }
.k-backend { color: var(--teal); border-color: color-mix(in srgb, var(--teal) 40%, transparent); background: color-mix(in srgb, var(--teal) 10%, transparent); }
.k-server { color: var(--ok); border-color: color-mix(in srgb, var(--ok) 40%, transparent); background: color-mix(in srgb, var(--ok) 10%, transparent); }
.k-metric { color: var(--warn); border-color: color-mix(in srgb, var(--warn) 40%, transparent); background: color-mix(in srgb, var(--warn) 10%, transparent); }
.k-log { color: var(--muted); border-color: var(--line-strong); background: var(--panel-2); }
.k-capture { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 40%, transparent); background: color-mix(in srgb, var(--accent) 10%, transparent); }
.k-stat { color: var(--warn); border-color: color-mix(in srgb, var(--warn) 40%, transparent); background: color-mix(in srgb, var(--warn) 10%, transparent); }
.k-finding { color: var(--danger); border-color: color-mix(in srgb, var(--danger) 40%, transparent); background: color-mix(in srgb, var(--danger) 10%, transparent); }
.k-report { color: var(--ok); border-color: color-mix(in srgb, var(--ok) 40%, transparent); background: color-mix(in srgb, var(--ok) 10%, transparent); }
.k-vm { color: var(--teal); border-color: color-mix(in srgb, var(--teal) 40%, transparent); background: color-mix(in srgb, var(--teal) 10%, transparent); }
.k-lun { color: var(--accent-2); border-color: color-mix(in srgb, var(--accent-2) 40%, transparent); background: color-mix(in srgb, var(--accent-2) 10%, transparent); }
.k-host { color: var(--orange); border-color: color-mix(in srgb, var(--orange) 40%, transparent); background: color-mix(in srgb, var(--orange) 10%, transparent); }

.steplist { max-height: calc(100vh - 400px); min-height: 200px; overflow: auto; padding: .3rem; }
.step-item {
  display: grid; grid-template-columns: 22px 1fr; gap: .45rem; align-items: start;
  width: 100%; text-align: left; font: inherit; background: none; border: 0; color: var(--muted);
  padding: .38rem .45rem; border-radius: 7px; cursor: pointer; font-size: .75rem; line-height: 1.35;
  transition: background .15s, color .15s;
}
.step-item:hover { background: var(--panel-2); color: var(--text); }
.step-item .si-num { font-family: var(--mono); font-size: .62rem; color: var(--dim); padding-top: .1rem; }
.step-item .si-main { display: flex; flex-direction: column; gap: .1rem; min-width: 0; }
.step-item .si-label { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.step-item .si-hop { font-size: .6rem; color: var(--dim); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.step-item.active { background: color-mix(in srgb, var(--accent) 14%, transparent); color: var(--text); box-shadow: inset 2px 0 0 var(--accent); }
.step-item.active .si-num { color: var(--accent); }
.step-item.done { color: var(--dim); }
.step-item.done .si-num::after { content: "✓"; margin-left: 2px; color: var(--ok); }

/* ---- bottom panel ---- */
.panel { border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); margin-top: .9rem; overflow: hidden; }
.tabs { display: flex; gap: .1rem; border-bottom: 1px solid var(--line); padding: 0 .4rem; overflow-x: auto; background: color-mix(in srgb, var(--bg-elev) 50%, transparent); }
.tab {
  font: inherit; font-size: .76rem; font-weight: 550; color: var(--muted); background: none; border: 0;
  padding: .6rem .7rem; cursor: pointer; border-bottom: 2px solid transparent; white-space: nowrap;
}
.tab:hover { color: var(--text); }
.tab.active { color: var(--text); border-bottom-color: var(--accent); }
.tab .tab-dot { display: inline-block; width: 5px; height: 5px; border-radius: 50%; background: var(--accent); margin-left: .3rem; vertical-align: middle; }
.tab-body { padding: .9rem 1rem 1rem; min-height: 210px; }
.tab-panel { display: none; animation: fadeup .28s ease; }
.tab-panel.active { display: block; }
@keyframes fadeup { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

.explain-step { display: flex; gap: .9rem; align-items: flex-start; }
.explain-badge { flex: 0 0 auto; display: flex; flex-direction: column; align-items: center; gap: .25rem; }
.explain-badge .eb-num { font-family: var(--mono); font-size: .7rem; color: var(--accent); border: 1px solid color-mix(in srgb, var(--accent) 40%, transparent); background: color-mix(in srgb, var(--accent) 10%, transparent); border-radius: 7px; padding: .2rem .45rem; }
.explain-badge .eb-line { width: 1px; flex: 1; min-height: 20px; background: linear-gradient(var(--line-strong), transparent); }
.explain-body { min-width: 0; flex: 1; }
.explain-body h4 { margin: 0 0 .2rem; font-size: .92rem; color: var(--text); }
.explain-body .hop { font-family: var(--mono); font-size: .68rem; color: var(--dim); margin-bottom: .5rem; display: flex; gap: .4rem; flex-wrap: wrap; align-items: center; }
.explain-body .hop .arrow { color: var(--accent); }
.explain-body .detail { font-size: .86rem; color: var(--text-soft); }
.explain-body .detail p { margin: 0 0 .6em; }
.explain-body .detail ul { margin: .3em 0 .7em; padding-left: 1.1rem; }
.explain-body .detail code { background: color-mix(in srgb, var(--accent) 10%, transparent); border: 1px solid color-mix(in srgb, var(--accent) 20%, transparent); padding: .05em .3em; border-radius: 4px; font-size: .85em; }
.explain-body .detail strong { color: var(--text); }
.channel-rule { margin-top: .7rem; padding: .55rem .65rem; border-left: 2px solid var(--accent); background: color-mix(in srgb, var(--accent) 7%, transparent); border-radius: 0 7px 7px 0; font-size: .78rem; color: var(--text-soft); }
.channel-rule .cr-label { display: block; font-size: .6rem; letter-spacing: .12em; text-transform: uppercase; color: var(--accent); font-weight: 700; margin-bottom: .15rem; }
.tag-row { display: flex; gap: .3rem; flex-wrap: wrap; margin-top: .6rem; }
.tag { font-size: .64rem; font-family: var(--mono); padding: .1rem .35rem; border-radius: 4px; background: var(--panel-2); border: 1px solid var(--line); color: var(--muted); }

.code-block { background: var(--bg); border: 1px solid var(--line); border-radius: 10px; padding: .7rem .8rem; overflow: auto; font-size: .74rem; line-height: 1.55; color: var(--text-soft); margin: 0 0 .7rem; white-space: pre; }
.code-block .hl { color: var(--accent); }
.code-block .hl2 { color: var(--accent-2); }
.code-block .hl3 { color: var(--ok); }
.code-label { font-size: .62rem; text-transform: uppercase; letter-spacing: .1em; color: var(--dim); margin: 0 0 .3rem; font-weight: 650; }

.kv { display: grid; grid-template-columns: minmax(90px, auto) 1fr; gap: .25rem .8rem; font-size: .8rem; }
.kv dt { color: var(--dim); font-size: .74rem; }
.kv dd { margin: 0; color: var(--text-soft); }

.config-card { border: 1px solid var(--line); border-radius: 10px; padding: .7rem .8rem; margin-bottom: .6rem; background: color-mix(in srgb, var(--bg-elev) 45%, transparent); }
.config-card h5 { margin: 0 0 .4rem; font-size: .76rem; color: var(--accent); font-weight: 650; }
.config-card ul { margin: 0; padding-left: 1rem; font-size: .8rem; color: var(--text-soft); }
.config-card li { margin: .18em 0; }
.config-card code { font-size: .85em; color: var(--text); }

.callout { border: 1px solid var(--line-strong); border-left: 3px solid var(--warn); background: color-mix(in srgb, var(--warn) 7%, transparent); border-radius: 0 10px 10px 0; padding: .6rem .8rem; font-size: .82rem; color: var(--text-soft); margin-bottom: .6rem; }
.callout.danger { border-left-color: var(--danger); background: color-mix(in srgb, var(--danger) 7%, transparent); }
.callout.ok { border-left-color: var(--ok); background: color-mix(in srgb, var(--ok) 7%, transparent); }
.callout strong { color: var(--text); }

.journey-table { width: 100%; border-collapse: collapse; font-size: .76rem; }
.journey-table th, .journey-table td { text-align: left; padding: .4rem .5rem; border-bottom: 1px solid var(--line); vertical-align: top; }
.journey-table th { color: var(--dim); font-weight: 600; font-size: .66rem; text-transform: uppercase; letter-spacing: .08em; }
.journey-table td { color: var(--text-soft); }
.journey-table .mono { font-family: var(--mono); font-size: .7rem; }

/* token inspector */
.token-layout { display: grid; grid-template-columns: minmax(0, 1fr) 220px; gap: 1rem; }
.token-select { display: flex; flex-direction: column; gap: .3rem; }
.token-select button {
  text-align: left; font: inherit; font-size: .74rem; padding: .4rem .5rem; border-radius: 7px; cursor: pointer;
  border: 1px solid var(--line); background: var(--panel-2); color: var(--muted);
}
.token-select button .ts-store { display: block; font-size: .58rem; color: var(--dim); text-transform: uppercase; letter-spacing: .08em; }
.token-select button.active { border-color: var(--accent); color: var(--text); background: color-mix(in srgb, var(--accent) 10%, transparent); }
.jwt-part { margin-bottom: .5rem; }
.jwt-part .jp-label { font-size: .6rem; text-transform: uppercase; letter-spacing: .1em; color: var(--dim); display: flex; justify-content: space-between; gap: .5rem; }
.jwt-part pre { margin: .2rem 0 0; }
.jwt-raw { word-break: break-all; font-size: .68rem; line-height: 1.5; color: var(--dim); border: 1px dashed var(--line); border-radius: 6px; padding: .4rem .5rem; margin-bottom: .6rem; background: var(--bg); }
.jwt-raw b { color: var(--accent); font-weight: 400; }
.jwt-raw i { color: var(--accent-2); font-style: normal; }
.jwt-raw u { color: var(--ok); text-decoration: none; }

/* completion */
.complete-banner { display: flex; align-items: center; gap: .7rem; padding: .55rem .8rem; border-radius: 10px; margin-top: .8rem;
  border: 1px solid color-mix(in srgb, var(--ok) 40%, transparent); background: color-mix(in srgb, var(--ok) 9%, transparent); font-size: .8rem; color: var(--text-soft); }
.complete-banner svg { color: var(--ok); flex: 0 0 auto; }

/* ---------- compare page ---------- */
.compare-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1rem; }
.decision { border: 1px solid var(--line); border-radius: var(--radius); padding: 1.1rem; background: var(--panel); }
.decision .q { font-weight: 600; margin-bottom: .6rem; font-size: .9rem; }
.choice-row { display: flex; gap: .4rem; flex-wrap: wrap; }
.choice {
  font: inherit; font-size: .78rem; padding: .4rem .7rem; border-radius: 8px; cursor: pointer;
  border: 1px solid var(--line-strong); background: var(--panel-2); color: var(--muted);
}
.choice:hover { color: var(--text); border-color: var(--accent); }
.choice.sel { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); font-weight: 600; }
.verdict { margin-top: 1rem; padding: .8rem .9rem; border-radius: 10px; border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  background: color-mix(in srgb, var(--accent) 8%, transparent); font-size: .85rem; color: var(--text-soft); min-height: 70px; }
.verdict strong { color: var(--text); }

/* ---------- misc ---------- */
.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1rem; }
.mt-1 { margin-top: 1rem; } .mt-2 { margin-top: 2rem; } .mb-0 { margin-bottom: 0; }
.muted { color: var(--muted); } .dim { color: var(--dim); }
.mono { font-family: var(--mono); }
.center { text-align: center; }
.footer { border-top: 1px solid var(--line); margin-top: 3rem; padding: 2rem clamp(1rem, 3vw, 2.2rem); max-width: var(--maxw); margin-left: auto; margin-right: auto; font-size: .8rem; color: var(--muted); }
.footer p { margin: 0 0 .4rem; }
.footer-dim { color: var(--dim); font-size: .74rem; }
.toast {
  position: fixed; bottom: 1.2rem; left: 50%; transform: translate(-50%, 20px); opacity: 0; pointer-events: none;
  background: var(--panel-solid); border: 1px solid var(--line-strong); color: var(--text);
  padding: .5rem .9rem; border-radius: 9px; font-size: .8rem; z-index: 200; box-shadow: var(--shadow);
  transition: opacity .2s, transform .2s; max-width: 90vw;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

.loading { display: flex; align-items: center; gap: .6rem; color: var(--dim); font-size: .85rem; padding: 2rem 0; }
.spinner { width: 16px; height: 16px; border-radius: 50%; border: 2px solid var(--line-strong); border-top-color: var(--accent); animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.selftest-list { display: flex; flex-direction: column; gap: .3rem; font-family: var(--mono); font-size: .78rem; }
.selftest-row { display: flex; gap: .6rem; padding: .3rem .5rem; border-radius: 6px; background: var(--panel-2); }
.selftest-row .st-pass { color: var(--ok); } .selftest-row .st-fail { color: var(--danger); }
.selftest-row .st-name { color: var(--text-soft); }
.selftest-row .st-detail { color: var(--dim); margin-left: auto; }

/* ---------- page headers & shared bits ---------- */
.page-head { padding: .4rem 0 1.4rem; max-width: 900px; }
.page-head h1 { font-size: clamp(1.7rem, 3.4vw, 2.6rem); letter-spacing: -.03em; margin-bottom: .5rem; }
.page-lede { font-size: clamp(.98rem, 1.4vw, 1.08rem); color: var(--text-soft); max-width: 72ch; }
.crumbs { display: flex; gap: .45rem; align-items: center; font-size: .76rem; color: var(--dim); margin-bottom: .9rem; }
.crumbs a { color: var(--muted); }
.crumbs span[aria-hidden] { color: var(--line-strong); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
kbd { font-family: var(--mono); font-size: .74em; border: 1px solid var(--line-strong); border-bottom-width: 2px; border-radius: 4px; padding: .05em .35em; background: var(--panel-2); color: var(--text-soft); }
.legend-row { display: flex; gap: 1rem; flex-wrap: wrap; font-size: .72rem; color: var(--dim); margin-top: 1rem; }
.legend-row span { display: inline-flex; align-items: center; gap: .35rem; }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius-sm); background: color-mix(in srgb, var(--bg-elev) 40%, transparent); }

/* ---------- home ---------- */
.hero-art { position: relative; display: grid; place-items: center; }
.hero-art::before { content: ""; position: absolute; inset: 8% 4%; background: radial-gradient(closest-side, color-mix(in srgb, var(--accent) 18%, transparent), transparent 72%); filter: blur(24px); z-index: -1; }
.hero-svg { width: 100%; height: auto; max-height: 440px; overflow: visible; }
.hs-title { fill: var(--text); font-family: var(--sans); font-size: 13px; font-weight: 650; }
.hs-brand { fill: var(--text); font-family: var(--sans); font-size: 17px; font-weight: 700; letter-spacing: -.02em; }
.hs-row { fill: var(--text-soft); font-family: var(--sans); font-size: 10.5px; font-weight: 600; }
.hs-sub { fill: var(--dim); font-family: var(--sans); font-size: 9px; }
.flow-line { stroke: var(--accent); stroke-dasharray: 6 5; animation: dashflow 2.2s linear infinite; }
.flow-line.d2 { animation-delay: -.6s; opacity: .65; }
.flow-line.d3 { animation-delay: -1.1s; }
.flow-line.d4 { animation-delay: -1.6s; opacity: .7; }
.role-card { border-top: 2px solid color-mix(in srgb, var(--accent) 50%, transparent); }
.role-card:hover { border-top-color: var(--accent-2); }
.store-grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.store-card { border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); padding: 1rem 1.05rem; }
.store-head { display: flex; align-items: center; gap: .5rem; margin-bottom: .7rem; color: var(--accent); }
.store-head strong { color: var(--text); font-size: .95rem; }
.store-card p { font-size: .82rem; color: var(--muted); margin: 0 0 .55rem; }
.store-card p:last-child { margin-bottom: 0; }
.store-card p b { display: block; font-size: .64rem; letter-spacing: .1em; text-transform: uppercase; margin-bottom: .1rem; }
.store-card .store-good b { color: var(--ok); }
.store-card .store-bad b { color: var(--danger); }
.store-card.warn { border-color: color-mix(in srgb, var(--warn) 32%, var(--line)); }
.store-card.ok { border-color: color-mix(in srgb, var(--ok) 26%, var(--line)); }
.path-grid { display: grid; gap: .8rem; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); counter-reset: path; }
.path-step { border: 1px solid var(--line); border-radius: var(--radius); padding: 1rem; background: color-mix(in srgb, var(--bg-elev) 55%, transparent); position: relative; }
.path-num { font-family: var(--mono); font-size: .68rem; color: var(--accent); letter-spacing: .08em; }
.path-step h3 { font-size: .92rem; margin: .4rem 0 .35rem; }
.path-step p { font-size: .82rem; color: var(--muted); margin: 0; }
.path-list { display: flex; flex-direction: column; margin: 1rem 0 0; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.path-list a { display: flex; align-items: center; gap: .8rem; padding: .55rem .9rem; color: var(--text-soft); border-bottom: 1px solid var(--line); background: color-mix(in srgb, var(--bg-elev) 35%, transparent); }
.path-list a:last-child { border-bottom: 0; }
.path-list a:hover { background: var(--panel-2); text-decoration: none; color: var(--text); }
.pl-num { font-family: var(--mono); font-size: .68rem; color: var(--dim); width: 1.6rem; }
.pl-title { font-size: .86rem; font-weight: 550; }
.pl-meta { margin-left: auto; font-size: .68rem; color: var(--dim); }
.home-foot { margin-top: 2.4rem; }

/* ---------- learn ---------- */
.doc-index { display: flex; flex-direction: column; gap: 2rem; }
.chapter-head { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-bottom: .8rem; padding-bottom: .5rem; border-bottom: 1px solid var(--line); }
.chapter-head h2 { margin: 0; font-size: clamp(1.15rem, 2vw, 1.4rem); }
.doc-wrap { max-width: 1180px; min-width: 0; }
.doc-head { max-width: 850px; margin-bottom: 1.6rem; }
.doc-head h1 { font-size: clamp(1.8rem, 3.6vw, 2.7rem); letter-spacing: -.03em; margin-bottom: .5rem; }
.doc-meta { display: flex; align-items: center; gap: .45rem; flex-wrap: wrap; margin-top: 1rem; }
.doc-layout { display: grid; grid-template-columns: 230px minmax(0, 1fr); gap: 2.6rem; align-items: start; min-width: 0; }
.doc-layout > * { min-width: 0; }
.doc-toc a.current { color: var(--accent); font-weight: 600; }
.doc-try { margin-top: 2.6rem; }
.doc-nav { display: flex; justify-content: space-between; gap: 1rem; margin-top: 2.6rem; padding-top: 1.4rem; border-top: 1px solid var(--line); }

/* ---------- chapter search & progress ---------- */
.learn-search,
.glossary-tools {
  display: flex; align-items: center; gap: .8rem; flex-wrap: wrap; margin: 0 0 1rem;
}
.learn-search .search,
.glossary-tools .search { flex: 1 1 320px; max-width: 620px; }
.search-wide input { width: 100%; }
.learn-search .list-count { margin: 0; }
.glossary-tools .dim { font-size: .76rem; }
.search-results { margin-bottom: 1.4rem; }
.search-result p { margin-bottom: 0; }
.search-result mark { background: color-mix(in srgb, var(--warn) 32%, transparent); color: var(--text); padding: 0 .12em; border-radius: 3px; }
.glossary-empty { font-size: .86rem; }

.learn-progress {
  display: grid; grid-template-columns: minmax(0, 1fr) 220px auto; gap: 1rem; align-items: center;
  border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel);
  padding: .8rem 1rem; margin-bottom: 1.4rem;
}
.learn-progress-copy strong { display: block; font-size: .95rem; color: var(--text); margin-bottom: .15rem; }
.learn-progress-copy .dim { display: block; font-size: .74rem; }
.progress-bar { height: 8px; border-radius: 999px; background: var(--line); overflow: hidden; }
.progress-bar span { display: block; height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--accent), var(--accent-2)); transition: width .35s ease; }
.doc-nav a { display: block; max-width: 46%; }
.doc-nav .dir { display: block; font-size: .7rem; text-transform: uppercase; letter-spacing: .12em; color: var(--dim); }
.doc-nav .ttl { color: var(--text); font-weight: 600; font-size: .9rem; }
.doc-nav a:hover .ttl { color: var(--accent); }

/* ---------- scenario list ---------- */
.list-toolbar { display: flex; align-items: flex-start; justify-content: space-between; gap: 1rem; flex-wrap: wrap; margin-bottom: .8rem; }
.list-tools { display: flex; align-items: center; gap: .6rem; flex-wrap: wrap; }
.search input {
  font: inherit; font-size: .8rem; color: var(--text); background: var(--panel-2); border: 1px solid var(--line-strong);
  border-radius: 8px; padding: .42rem .65rem; width: 210px; outline: none;
}
.search input:focus { border-color: var(--accent); box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 20%, transparent); }
.filter .fc { font-family: var(--mono); font-size: .64rem; opacity: .65; margin-left: .15rem; }
.list-count { font-size: .76rem; margin: 0 0 .8rem; }
.empty-state { grid-column: 1 / -1; border: 1px dashed var(--line-strong); border-radius: var(--radius); padding: 2rem; text-align: center; }
.empty-state strong { display: block; margin-bottom: .3rem; }
.empty-state p { margin: 0 0 1rem; font-size: .85rem; }

/* ---------- scenario page ---------- */
.sim-head-actions { display: flex; gap: .35rem; flex-wrap: wrap; justify-content: flex-end; }
.sim-note { display: flex; gap: 1rem; justify-content: space-between; flex-wrap: wrap; font-size: .72rem; color: var(--dim); margin-bottom: .7rem; }
.sim-note span { display: inline-flex; align-items: center; gap: .35rem; }
.sim-pager { display: flex; justify-content: space-between; gap: 1rem; margin-top: 1.6rem; padding-top: 1.2rem; border-top: 1px solid var(--line); }
.sim-pager a { display: block; max-width: 46%; }
.sim-pager .dir { display: block; font-size: .68rem; text-transform: uppercase; letter-spacing: .12em; color: var(--dim); }
.sim-pager .ttl { color: var(--text); font-weight: 600; font-size: .86rem; }
.sim-pager a:hover .ttl { color: var(--accent); }

/* ---------- compare ---------- */
.compare-table { width: 100%; border-collapse: collapse; font-size: .82rem; min-width: 640px; }
.compare-table th, .compare-table td { text-align: left; padding: .6rem .75rem; border-bottom: 1px solid var(--line); vertical-align: top; }
.compare-table th { font-size: .68rem; text-transform: uppercase; letter-spacing: .09em; color: var(--dim); background: var(--panel-2); }
.compare-table td:first-child { color: var(--text); }
.compare-table td { color: var(--text-soft); }
.compare-table tbody tr:last-child td { border-bottom: 0; }
.compare-table tbody tr:hover td { background: color-mix(in srgb, var(--accent) 4%, transparent); }
.matrix-table td:not(:first-child):not(.why) { text-align: center; font-family: var(--mono); }
.matrix-table .why { font-size: .76rem; color: var(--muted); min-width: 240px; }
.mx { display: inline-block; font-weight: 700; }
.mx.ok { color: var(--ok); }
.mx.care { color: var(--warn); }
.mx.no { color: var(--danger); }
.decision .tag-row .pill { display: inline-flex; align-items: center; gap: .25rem; }
.verdict p { margin-bottom: 0; }

/* ---------- quiz & progress ---------- */
.progress-overview {
  display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 1.2rem; align-items: center;
  border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); padding: 1rem 1.1rem;
}
.progress-main h2 { margin: .1rem 0 .55rem; font-size: 1.12rem; }
.progress-main .eyebrow { margin-bottom: .3rem; }
.progress-stats { display: flex; gap: 1.2rem; flex-wrap: wrap; }
.progress-stats div { min-width: 72px; }
.progress-stats strong { display: block; font-size: 1.35rem; letter-spacing: -.03em; color: var(--text); }
.progress-stats span { display: block; font-size: .66rem; color: var(--dim); text-transform: uppercase; letter-spacing: .08em; }

.quiz { display: flex; flex-direction: column; gap: .8rem; }
.quiz-topics { display: flex; gap: .4rem; flex-wrap: wrap; margin: 0 0 1rem; }
.quiz-topics .filter { text-decoration: none; display: inline-flex; align-items: center; }
.quiz-q {
  margin: 0; padding: 1rem 1.1rem; min-width: 0;
  border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel);
  transition: border-color .2s, background .2s;
}
.quiz-q legend { display: flex; align-items: flex-start; gap: .55rem; padding: 0; width: 100%; }
.quiz-num { font-family: var(--mono); font-size: .68rem; color: var(--accent); padding-top: .15rem; flex: 0 0 auto; }
.quiz-question { flex: 1 1 auto; font-weight: 650; color: var(--text); line-height: 1.4; font-size: .92rem; }
.quiz-q legend .pill { margin-left: auto; flex: 0 0 auto; }
.quiz-options { display: grid; gap: .4rem; margin-top: .8rem; }
.quiz-option {
  display: flex; align-items: flex-start; gap: .55rem; cursor: pointer;
  padding: .55rem .65rem; border: 1px solid var(--line); border-radius: 9px;
  background: var(--panel-2); color: var(--text-soft); font-size: .85rem; line-height: 1.4;
  transition: border-color .15s, background .15s, color .15s;
}
.quiz-option:hover { border-color: var(--accent); color: var(--text); }
.quiz-option input { margin: .18rem 0 0; accent-color: var(--accent); flex: 0 0 auto; }
.quiz-option:has(input:checked) { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 10%, transparent); color: var(--text); }
.quiz-q.is-correct { border-color: color-mix(in srgb, var(--ok) 50%, var(--line)); }
.quiz-q.is-wrong { border-color: color-mix(in srgb, var(--danger) 55%, var(--line)); }
.quiz-q.is-missing { border-color: var(--warn); }
.quiz-feedback { margin-top: .8rem; padding-top: .7rem; border-top: 1px solid var(--line); font-size: .82rem; color: var(--text-soft); }
.quiz-feedback p { margin: .45rem 0; }
.quiz-feedback a { font-size: .78rem; }
.quiz-verdict { display: flex; align-items: baseline; gap: .5rem; flex-wrap: wrap; }
.quiz-verdict strong { font-size: .86rem; }
.quiz-verdict.ok strong { color: var(--ok); }
.quiz-verdict.bad strong { color: var(--danger); }
.quiz-verdict span { font-size: .76rem; color: var(--muted); }
.quiz-actions { display: flex; align-items: center; gap: .6rem; flex-wrap: wrap; margin: .4rem 0 1rem; }
.quiz-actions [data-quiz-status] { margin-left: auto; font-size: .76rem; }
.quiz-result { border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); padding: 1rem 1.1rem; outline: none; }
.quiz-result p { margin: .7rem 0 0; font-size: .85rem; color: var(--text-soft); }
.quiz-score { display: flex; align-items: center; gap: 1rem; }
.quiz-score-value { font-size: 2rem; font-weight: 700; letter-spacing: -.05em; color: var(--accent); }
.quiz-score-value small { font-size: 1rem; color: var(--dim); font-weight: 500; }
.quiz-score.ok .quiz-score-value { color: var(--ok); }
.quiz-score.care .quiz-score-value { color: var(--warn); }
.quiz-score.bad .quiz-score-value { color: var(--danger); }
.quiz-score p { margin: .2rem 0 0; }

/* ---------- selftest ---------- */
.selftest-summary { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; padding: 1rem 1.1rem; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); margin-bottom: 1.4rem; }
.selftest-summary.all-pass { border-color: color-mix(in srgb, var(--ok) 40%, var(--line)); }
.selftest-summary.has-fail { border-color: color-mix(in srgb, var(--danger) 45%, var(--line)); }
.st-score { display: flex; align-items: center; gap: .4rem; color: var(--ok); }
.has-fail .st-score { color: var(--danger); }
.st-score strong { font-size: 1.25rem; color: var(--text); }
.selftest-summary button { margin-left: auto; }
.selftest-groups { display: flex; flex-direction: column; gap: .4rem; }
.selftest-group { border: 1px solid var(--line); border-radius: 10px; background: color-mix(in srgb, var(--bg-elev) 40%, transparent); overflow: hidden; }
.selftest-group > summary { cursor: pointer; padding: .5rem .7rem; display: flex; align-items: center; gap: .5rem; font-size: .82rem; list-style: none; }
.selftest-group > summary::-webkit-details-marker { display: none; }
.selftest-group[open] > summary { border-bottom: 1px solid var(--line); }
.selftest-group > summary .dim { margin-left: auto; font-family: var(--mono); font-size: .7rem; }
.selftest-group .selftest-list { padding: .4rem; }
.selftest-row .st-detail { max-width: 45%; text-align: right; }


/* ---------- responsive ---------- */
@media (max-width: 1340px) {
  .site-search-trigger { flex-basis: 190px; }
  .site-search-trigger-kbd { display: none; }
  .topbar-tools > .btn-ghost { display: none; }
}
@media (max-width: 1024px) {
  .site-search-trigger { flex: 0 0 38px; width: 38px; padding: 0; justify-content: center; }
  .site-search-trigger-label { display: none; }
}
@media (max-width: 1000px) {
  .doc-layout { grid-template-columns: 1fr; gap: 1.2rem; }
  .doc-toc { display: none; }
  .sim-head-actions { justify-content: flex-start; }
  .learn-progress { grid-template-columns: minmax(0, 1fr) 160px; }
  .learn-progress .btn { grid-column: 1 / -1; justify-self: start; }
  .progress-overview { grid-template-columns: 1fr; }
  .topic-hero { grid-template-columns: 1fr; gap: 1.2rem; }
}
@media (max-width: 1150px) {
  .brand-text span { display: none; }
  .sim-shell { grid-template-columns: 1fr; }
  .sim-rail { position: static; }
  .vault { max-height: none; }
  .steplist { max-height: 260px; }
  .scenario-guide { max-height: none; }
  .hero { grid-template-columns: 1fr; }
}
@media (max-width: 760px) {
  .topbar { flex-wrap: wrap; gap: .6rem .8rem; }
  .brand-text span { display: none; }
  .nav { order: 3; width: 100%; justify-content: space-between; gap: .1rem; flex-wrap: nowrap; }
  .nav a { padding: .35rem .3rem; font-size: .74rem; }
  .topbar-tools { margin-left: auto; }
  .token-layout { grid-template-columns: 1fr; }
  .explain-step { gap: .6rem; }
  .tab-body { padding: .8rem; }
  .stage { min-width: 780px; }
  .list-tools { width: 100%; }
  .search input { width: 100%; }
  .search { flex: 1 1 100%; }
  .learn-progress,
  .progress-overview { grid-template-columns: 1fr; }
  .learn-progress .btn { justify-self: start; }
  .quiz-q legend { flex-wrap: wrap; }
  .quiz-q legend .pill { margin-left: 1.55rem; }
  .quiz-actions [data-quiz-status] { margin-left: 0; flex-basis: 100%; }
  .sim-pager a, .doc-nav a { max-width: 48%; }
  .hero-stats { gap: 1.2rem; }
  .site-search-panel {
    width: calc(100vw - 1rem); max-height: calc(100vh - 1rem); max-height: calc(100dvh - 1rem);
    margin: .5rem auto 0; border-radius: 14px;
  }
  .site-search-dialog { height: 100vh; height: 100dvh; }
  .site-search-foot { gap: .55rem; font-size: .6rem; }
}
@media (max-width: 360px) {
  .nav a { padding: .35rem .22rem; font-size: .7rem; }
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  html { scroll-behavior: auto; }
  .wire.is-active { stroke-dasharray: none; }
}

@media print {
  .topbar, .sim-rail, .controls, .footer, .doc-toc, .site-search-trigger, .site-search-dialog { display: none !important; }
  body { background: #fff; color: #000; }
  .prose { max-width: none; }
}