/* ============================================================
   NeonAgent landing page
   Colour is defined once as semantic tokens on :root (dark).
   [data-theme="light"] overrides only the tokens — no component
   rule below needs to know which theme is active.
   ============================================================ */

:root {
  color-scheme: dark;

  /* ---- surfaces ---- */
  --bg: #08080b;
  --scrim: rgba(8,8,11,.78);            /* sticky nav when scrolled */
  --foot-bg: rgba(0,0,0,.3);
  --window-bg-1: rgba(21,21,30,.96);    /* mock browser window */
  --window-bg-2: rgba(10,10,14,.98);
  --chrome-bg: rgba(255,255,255,.022);
  --panel-bg: rgba(9,9,13,.72);         /* mock side panel */
  --inset-bg: rgba(0,0,0,.42);          /* inline code chips, pills */
  --inset-bg-soft: rgba(0,0,0,.3);
  --code-bg: #07070a;
  --raise-1: rgba(255,255,255,.03);     /* subtle raised fill */
  --raise-2: rgba(255,255,255,.055);    /* hover fill */
  --raise-3: rgba(255,255,255,.028);    /* panel input, result card */
  --card-grad-1: rgba(255,255,255,.03);
  --card-grad-2: rgba(255,255,255,.008);
  --card-grad-h1: rgba(255,255,255,.05);
  --card-grad-h2: rgba(255,255,255,.012);
  --glass-top: rgba(255,255,255,.02);   /* window inner highlight */
  --skeleton: rgba(255,255,255,.05);    /* mock "related" bars */
  --dash: rgba(255,255,255,.06);        /* dashed separators */
  --traffic: #2c2c38;                   /* mock window dots */

  /* ---- lines ---- */
  --line: rgba(255,255,255,.08);
  --line-strong: rgba(255,255,255,.16);

  /* ---- text ---- */
  --text: #ecedf3;
  --text-strong: #f2f2f7;               /* mock page heading, hover states */
  --body-dim: #9d9eb2;                  /* mock page paragraphs */
  --body-dim-2: #a9aabf;                /* mock page quote */
  --ink-soft: #cfd0de;                  /* inline code, step code */
  --ink-soft-2: #c9cadb;                /* model chips */
  --ink-soft-3: #c8c9db;                /* code block text */
  --ink-soft-4: #b6b7c9;                /* mini-flow, completed steps */
  --ink-soft-5: #a8a9bd;                /* pipeline tool chips */
  --muted: #8f90a3;
  --muted-2: #63647a;

  /* ---- accent (mint) ---- */
  --accent: #5ef2a0;                    /* fills only */
  --accent-text: #5ef2a0;               /* accent-coloured text */
  --accent-ink: #04220f;                /* text on accent fills */
  --accent-ink-2: #d6ffe9;              /* highlighted mock-page text */
  --accent-ink-3: #dffced;              /* user bubble text */
  --accent-soft: rgba(94,242,160,.12);
  --accent-line: rgba(94,242,160,.3);
  --accent-line-soft: rgba(94,242,160,.24);
  --accent-line-hover: rgba(94,242,160,.35);
  --accent-line-strong: rgba(94,242,160,.45);
  --accent-line-stronger: rgba(94,242,160,.42);
  --accent-fill-weak: rgba(94,242,160,.11);
  --accent-fill: rgba(94,242,160,.13);
  --accent-fill-2: rgba(94,242,160,.16);
  --accent-quote: rgba(94,242,160,.5);
  --accent-ring: rgba(94,242,160,.16);
  --accent-glow: rgba(94,242,160,.85);
  --accent-glow-2: rgba(94,242,160,.95);
  --accent-dot-glow: rgba(94,242,160,.8);

  /* ---- violet ---- */
  --violet: #8b7dff;
  --violet-soft: rgba(139,125,255,.1);
  --violet-line: rgba(139,125,255,.26);
  --violet-line-strong: rgba(139,125,255,.35);

  /* ---- gradient headline ---- */
  --grad-1: #5ef2a0;
  --grad-2: #7ff0d8;
  --grad-3: #8b7dff;

  /* ---- ambient effects ---- */
  --grid-line: rgba(255,255,255,.028);
  --glow-a: rgba(94,242,160,.16);
  --glow-b: rgba(139,125,255,.16);
  --stage-glow: rgba(94,242,160,.14);
  --window-shadow: rgba(0,0,0,.95);
  --brand-glow: rgba(45,212,191,.38);

  /* ---- ghost cursor ---- */
  --cursor-fill: #0b0b0f;
  --cursor-stroke: #5ef2a0;

  /* ---- theme switch ---- */
  --switch-bg: #1e293b;
  --switch-knob: #475569;
  --switch-icon: #e2e8f0;
  --switch-knob-shadow: rgba(0,0,0,.45);

  --radius: 14px;
  --radius-lg: 20px;
  --wrap: 1160px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
          "Microsoft YaHei", "Noto Sans SC", Roboto, Helvetica, Arial, sans-serif;
}

/* ============================================================
   light theme — token overrides only
   ============================================================ */
[data-theme="light"] {
  color-scheme: light;

  --bg: #f5f6f9;
  --scrim: rgba(245,246,249,.82);
  --foot-bg: rgba(15,23,42,.028);
  --window-bg-1: #ffffff;
  --window-bg-2: #fafbfd;
  --chrome-bg: rgba(15,23,42,.025);
  --panel-bg: #f7f8fb;
  --inset-bg: rgba(15,23,42,.045);
  --inset-bg-soft: rgba(15,23,42,.032);
  --code-bg: #f4f6f9;
  --raise-1: rgba(15,23,42,.032);
  --raise-2: rgba(15,23,42,.062);
  --raise-3: rgba(15,23,42,.028);
  --card-grad-1: #ffffff;
  --card-grad-2: #fbfcfe;
  --card-grad-h1: #ffffff;
  --card-grad-h2: #f4f8fc;
  --glass-top: rgba(15,23,42,.02);
  --skeleton: rgba(15,23,42,.09);
  --dash: rgba(15,23,42,.08);
  --traffic: #d5dae2;

  --line: rgba(15,23,42,.11);
  --line-strong: rgba(15,23,42,.2);

  --text: #10141f;
  --text-strong: #0a0e1a;
  --body-dim: #4c5364;
  --body-dim-2: #565d70;
  --ink-soft: #3a4152;
  --ink-soft-2: #3a4152;
  --ink-soft-3: #2c3342;
  --ink-soft-4: #4c5364;
  --ink-soft-5: #4c5364;
  --muted: #575e70;
  --muted-2: #767d90;

  /* fills stay bright mint so white-on-mint never happens; text goes deep green */
  --accent: #3fe0a0;
  --accent-text: #0a7f55;
  --accent-ink: #04220f;
  --accent-ink-2: #06412c;
  --accent-ink-3: #0a3d29;
  --accent-soft: rgba(16,143,95,.09);
  --accent-line: rgba(16,143,95,.26);
  --accent-line-soft: rgba(16,143,95,.2);
  --accent-line-hover: rgba(16,143,95,.34);
  --accent-line-strong: rgba(16,143,95,.4);
  --accent-line-stronger: rgba(16,143,95,.38);
  --accent-fill-weak: rgba(63,224,160,.2);
  --accent-fill: rgba(63,224,160,.18);
  --accent-fill-2: rgba(63,224,160,.26);
  --accent-quote: rgba(16,143,95,.45);
  --accent-ring: rgba(63,224,160,.28);
  --accent-glow: rgba(63,224,160,.5);
  --accent-glow-2: rgba(63,224,160,.66);
  --accent-dot-glow: rgba(63,224,160,.9);

  --violet: #6d5ce7;
  --violet-soft: rgba(109,92,231,.09);
  --violet-line: rgba(109,92,231,.26);
  --violet-line-strong: rgba(109,92,231,.34);

  /* headline gradient must stay legible on white */
  --grad-1: #0a9e6a;
  --grad-2: #0d8f9e;
  --grad-3: #6d5ce7;

  --grid-line: rgba(15,23,42,.05);
  --glow-a: rgba(63,224,160,.34);
  --glow-b: rgba(139,125,255,.2);
  --stage-glow: rgba(63,224,160,.26);
  --window-shadow: rgba(15,23,42,.13);
  --brand-glow: rgba(45,212,191,.3);

  --cursor-fill: #ffffff;
  --cursor-stroke: #0a7f55;

  --switch-bg: #e2e7ee;
  --switch-knob: #ffffff;
  --switch-icon: #46536a;
  --switch-knob-shadow: rgba(15,23,42,.2);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 84px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
h1, h2, h3 { line-height: 1.22; margin: 0; letter-spacing: -.02em; font-weight: 650; }
p { margin: 0; }
code { font-family: var(--mono); }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

/* ---------- background ---------- */
.bg-grid {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, #000 30%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, #000 30%, transparent 78%);
}
.bg-glow {
  position: fixed; z-index: 0; pointer-events: none;
  top: -320px; left: 50%; transform: translateX(-50%);
  width: 1100px; height: 700px;
  background:
    radial-gradient(circle at 32% 42%, var(--glow-a), transparent 62%),
    radial-gradient(circle at 68% 38%, var(--glow-b), transparent 62%);
  filter: blur(28px);
}
main, .nav, .foot { position: relative; z-index: 1; }

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  border-bottom: 1px solid transparent;
  transition: background .25s, border-color .25s, backdrop-filter .25s;
}
.nav.is-stuck {
  background: var(--scrim);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom-color: var(--line);
}
.nav-inner { display: flex; align-items: center; gap: 20px; height: 64px; }

.brand { display: inline-flex; align-items: center; gap: 9px; font-weight: 650; letter-spacing: -.01em; }
.brand-mark {
  display: block; width: 28px; height: 28px; border-radius: 9px; flex: none;
}
.brand-mark img {
  display: block; width: 100%; height: 100%;
  /* follows the icon's own rounded alpha shape, unlike a box-shadow */
  filter: drop-shadow(0 3px 11px var(--brand-glow));
}
.brand-mark.sm { width: 20px; height: 20px; border-radius: 6px; }
.brand-mark.sm img { filter: none; }
.brand-name { font-size: 16px; }
.brand-tag {
  font-family: var(--mono); font-size: 10.5px; color: var(--accent-text);
  border: 1px solid var(--accent-line); background: var(--accent-soft);
  padding: 2px 6px; border-radius: 5px; letter-spacing: .02em;
}

.nav-links { display: flex; gap: 4px; margin-left: 14px; }
.nav-links a {
  font-size: 14px; color: var(--muted); padding: 7px 11px; border-radius: 8px;
  transition: color .15s, background .15s;
}
.nav-links a:hover { color: var(--text); background: var(--raise-2); }
.nav-actions { margin-left: auto; display: flex; align-items: center; gap: 10px; }

.ghost-btn {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 13.5px; color: var(--muted);
  padding: 7px 12px; border-radius: 9px; border: 1px solid var(--line);
  transition: color .15s, border-color .15s, background .15s;
}
.ghost-btn:hover { color: var(--text); border-color: var(--line-strong); background: var(--raise-2); }

/* star count inside the GitHub button */
.gh-stars {
  font-size: 12.5px; font-weight: 600; line-height: 1.4;
  font-variant-numeric: tabular-nums;   /* keeps the width steady as it changes */
  color: var(--text);
  transition: color .15s;
}
.ghost-btn:hover .gh-stars { color: var(--accent-text); }

/* ---------- language toggle ---------- */
.lang-btn {
  display: inline-flex; align-items: center; gap: 6px;
  font: inherit; font-size: 13px; font-weight: 600; letter-spacing: .02em;
  color: var(--muted); background: var(--raise-1);
  border: 1px solid var(--line); border-radius: 9px;
  padding: 7px 11px; cursor: pointer;
  transition: color .16s, border-color .16s, background .16s;
}
.lang-btn:hover { color: var(--accent-text); border-color: var(--accent-line-stronger); background: var(--accent-soft); }
.lang-btn svg { opacity: .8; }
.lang-btn.switching #lang-label { animation: langPop .28s ease; }
@keyframes langPop { 0% { opacity: 0; transform: translateY(-4px); } 100% { opacity: 1; transform: none; } }

/* ---------- theme switch ---------- */
.theme-switch {
  position: relative; display: inline-flex; align-items: center; flex: none;
  width: 64px; height: 32px; padding: 0; margin: 0;
  border: 0; border-radius: 999px; cursor: pointer;
  background: var(--switch-bg);
  transition: background-color .3s ease-in-out;
  -webkit-tap-highlight-color: transparent;
}
.theme-switch:focus-visible { outline: 2px solid var(--accent-text); outline-offset: 3px; }

.ts-knob {
  position: absolute; top: 4px; left: 4px; z-index: 2;
  width: 24px; height: 24px; border-radius: 50%;
  display: grid; place-items: center;
  background: var(--switch-knob);
  box-shadow: 0 2px 6px var(--switch-knob-shadow);
  transition: transform .3s ease-in-out, background-color .3s ease-in-out;
}
[data-theme="dark"] .ts-knob { transform: translateX(32px); }

.ts-knob-icon { display: grid; place-items: center; width: 16px; height: 16px; }
.ts-knob-icon svg { width: 14px; height: 14px; fill: var(--switch-icon); display: block; }
.ts-knob-icon .ts-sun { display: none; }
[data-theme="light"] .ts-knob-icon .ts-moon { display: none; }
[data-theme="light"] .ts-knob-icon .ts-sun { display: block; }

.ts-track-icons {
  position: absolute; inset: 0; z-index: 1;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 8px; pointer-events: none;
}
.ts-track-icons svg { width: 14px; height: 14px; display: block; }
.ts-track-icons > span { display: block; transition: opacity .3s ease-in-out; }
.ts-sun-side svg { fill: #38bdf8; }
.ts-moon-side svg { fill: #94a3b8; }
.ts-sun-side { opacity: 0; }
.ts-moon-side { opacity: 1; }
[data-theme="dark"] .ts-sun-side { opacity: .4; }
[data-theme="dark"] .ts-moon-side { opacity: 0; }

/* opt-in crossfade while the theme flips (class removed after ~340ms) */
html.theme-anim,
html.theme-anim *,
html.theme-anim *::before,
html.theme-anim *::after {
  transition: background-color .28s ease, border-color .28s ease, color .28s ease !important;
}

/* ---------- buttons ---------- */
.solid-btn {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--accent); color: var(--accent-ink);
  font-weight: 620; font-size: 14.5px;
  padding: 11px 20px; border-radius: 11px;
  box-shadow: 0 10px 30px -12px var(--accent-glow);
  transition: transform .15s, box-shadow .2s, filter .2s;
}
.solid-btn:hover { transform: translateY(-1px); filter: brightness(1.06); box-shadow: 0 14px 36px -12px var(--accent-glow-2); }
.solid-btn.sm { padding: 8px 15px; font-size: 13.5px; border-radius: 9px; }

.line-btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 14.5px; color: var(--text);
  padding: 10px 19px; border-radius: 11px;
  border: 1px solid var(--line-strong); background: var(--raise-1);
  transition: background .18s, border-color .18s, transform .15s;
}
.line-btn:hover { background: var(--raise-2); transform: translateY(-1px); }

/* ---------- hero ---------- */
.hero { padding: 76px 24px 40px; position: relative; }
.hero-head { max-width: 780px; margin: 0 auto; text-align: center; }

.pill {
  display: inline-flex; align-items: center; gap: 9px;
  font-size: 12.5px; color: var(--muted); font-family: var(--mono); letter-spacing: .01em;
  border: 1px solid var(--line); background: var(--raise-1);
  padding: 6px 13px; border-radius: 999px;
}
.dot {
  width: 6px; height: 6px; border-radius: 50%; background: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-ring);
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse { 50% { opacity: .45; } }

.hero h1 { margin: 22px 0 0; font-size: clamp(38px, 6.4vw, 68px); font-weight: 700; letter-spacing: -.035em; }
.grad {
  background: linear-gradient(100deg, var(--grad-1) 8%, var(--grad-2) 42%, var(--grad-3) 96%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lede {
  margin: 22px auto 0; max-width: 620px;
  font-size: 16.5px; color: var(--muted); line-height: 1.75;
}
.lede strong { color: var(--text); font-weight: 600; }

.cta-row { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-top: 30px; }
.cta-row.center { margin-top: 26px; }

.hero-facts {
  list-style: none; display: flex; justify-content: center; flex-wrap: wrap;
  gap: 10px 30px; margin: 34px 0 0; padding: 0;
  font-size: 13.5px; color: var(--muted-2);
}
.hero-facts b { color: var(--text); font-family: var(--mono); font-size: 15px; margin-right: 5px; }

/* ---------- demo stage ---------- */
.stage { position: relative; margin-top: 58px; }
.stage-glow {
  position: absolute; inset: 6% 0 -12%; z-index: 0; pointer-events: none;
  background: radial-gradient(ellipse at 50% 30%, var(--stage-glow), transparent 66%);
  filter: blur(46px);
}
.window {
  position: relative; z-index: 1;
  border: 1px solid var(--line-strong); border-radius: var(--radius-lg);
  background: linear-gradient(180deg, var(--window-bg-1), var(--window-bg-2));
  box-shadow: 0 40px 90px -40px var(--window-shadow), 0 0 0 1px var(--glass-top) inset;
  overflow: hidden;
}
.chrome {
  display: flex; align-items: center; gap: 14px;
  padding: 11px 15px; border-bottom: 1px solid var(--line);
  background: var(--chrome-bg);
}
.lights { display: flex; gap: 6px; }
.lights i { width: 10px; height: 10px; border-radius: 50%; background: var(--traffic); }
.omnibox {
  flex: 1; display: flex; align-items: center; gap: 8px;
  font-family: var(--mono); font-size: 12px; color: var(--muted-2);
  background: var(--inset-bg); border: 1px solid var(--line);
  padding: 5px 12px; border-radius: 8px; max-width: 460px;
}
.omnibox .lock { color: var(--muted-2); font-size: 10px; }
.chrome-actions { margin-left: auto; }
.ext-dot {
  display: block; width: 9px; height: 9px; border-radius: 3px; background: var(--accent);
  box-shadow: 0 0 10px var(--accent-dot-glow);
}

.window-body { display: grid; grid-template-columns: 1fr 348px; min-height: 430px; }

/* fake page */
.page { position: relative; padding: 30px 34px; overflow: hidden; }
.page-head { border-bottom: 1px solid var(--line); padding-bottom: 16px; }
.page-kicker { font-family: var(--mono); font-size: 10.5px; letter-spacing: .18em; color: var(--muted-2); }
.page h3 { font-size: 21px; margin-top: 9px; color: var(--text-strong); }
.page-meta { font-size: 12px; color: var(--muted-2); margin-top: 7px; }
.page-cols { display: grid; grid-template-columns: 1fr 150px; gap: 26px; margin-top: 20px; }
.page-main p { font-size: 13.5px; color: var(--body-dim); margin-bottom: 14px; line-height: 1.85; border-radius: 8px; padding: 2px 6px; margin-left: -6px; transition: background .3s, color .3s; }
.page-quote {
  font-size: 13px; color: var(--body-dim-2); font-style: italic;
  border-left: 2px solid var(--accent-quote); padding: 8px 0 8px 14px; margin-top: 18px;
  border-radius: 4px; transition: background .3s;
}
.page-side { border-left: 1px solid var(--line); padding-left: 18px; }
.page-side b { display: block; font-size: 11px; font-family: var(--mono); color: var(--muted-2); letter-spacing: .1em; margin-bottom: 12px; }
.page-side span { display: block; height: 9px; border-radius: 4px; background: var(--skeleton); margin-bottom: 9px; }
.page-side span:nth-child(2) { width: 88%; }
.page-side span:nth-child(3) { width: 62%; }
.page-side span:nth-child(4) { width: 76%; }

[data-hit] { background: var(--accent-fill-weak); color: var(--accent-ink-2) !important; box-shadow: inset 0 0 0 1px var(--accent-quote); }

.ghost-cursor {
  position: absolute; top: 0; left: 0; z-index: 5;
  display: flex; align-items: center; gap: 6px;
  opacity: 0; transition: transform .55s cubic-bezier(.34,.9,.3,1), opacity .3s;
  pointer-events: none;
}
.ghost-cursor svg path { fill: var(--cursor-fill); stroke: var(--cursor-stroke); }
.ghost-cursor span {
  font-family: var(--mono); font-size: 10px; color: var(--accent-ink); background: var(--accent);
  padding: 2px 6px; border-radius: 5px; white-space: nowrap;
}
.ghost-cursor.is-on { opacity: 1; }

/* side panel */
.panel { border-left: 1px solid var(--line); background: var(--panel-bg); display: flex; flex-direction: column; }
.panel-head {
  display: flex; align-items: center; gap: 9px; padding: 12px 15px;
  border-bottom: 1px solid var(--line);
}
.panel-brand { display: inline-flex; align-items: center; gap: 7px; font-size: 13.5px; font-weight: 600; }
.panel-mode {
  margin-left: auto; font-family: var(--mono); font-size: 10.5px; color: var(--accent-text);
  border: 1px solid var(--accent-line); background: var(--accent-soft);
  padding: 2px 7px; border-radius: 5px;
}
.panel-body { flex: 1; padding: 16px 15px; display: flex; flex-direction: column; gap: 12px; min-height: 0; }

.bubble.user {
  align-self: flex-end; max-width: 92%;
  background: var(--accent-fill); border: 1px solid var(--accent-line-soft);
  color: var(--accent-ink-3); font-size: 13px; line-height: 1.65;
  padding: 10px 13px; border-radius: 13px 13px 4px 13px;
  min-height: 20px;
}
.bubble.user[data-empty="true"] { display: none; }
.bubble.user .caret { display: inline-block; width: 7px; margin-left: 1px; background: var(--accent-text); color: var(--accent-text); animation: blink 1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }

.agent-block { display: flex; flex-direction: column; gap: 11px; }
.agent-steps { display: flex; flex-direction: column; gap: 9px; }
.step {
  display: flex; align-items: flex-start; gap: 9px;
  font-size: 12.5px; line-height: 1.55;
  opacity: 0; transform: translateY(5px);
  animation: stepIn .32s ease forwards;
}
@keyframes stepIn { to { opacity: 1; transform: none; } }
.step .mark {
  flex: none; width: 16px; height: 16px; border-radius: 5px; margin-top: 2px;
  display: grid; place-items: center; font-size: 9px;
  border: 1px solid var(--line-strong); color: var(--muted-2);
}
.step.running .mark { border-color: var(--accent-line-strong); color: var(--accent-text); animation: spin 1.1s linear infinite; }
.step.done .mark { background: var(--accent-fill-2); border-color: var(--accent-line-strong); color: var(--accent-text); }
@keyframes spin { to { transform: rotate(360deg); } }
.step .txt { color: var(--muted); }
.step .txt code { color: var(--ink-soft); font-size: 12px; }
.step .txt small { display: block; color: var(--muted-2); font-size: 11.5px; margin-top: 2px; }
.step.done .txt { color: var(--ink-soft-4); }

.agent-result {
  border: 1px solid var(--line); border-radius: 12px; padding: 12px 13px;
  background: var(--raise-3); animation: stepIn .35s ease forwards; opacity: 0;
}
.agent-result h4 { margin: 0 0 9px; font-size: 12px; font-family: var(--mono); color: var(--accent-text); letter-spacing: .06em; font-weight: 600; }
.agent-result ul { margin: 0; padding: 0; list-style: none; }
.agent-result li {
  font-size: 12.5px; color: var(--ink-soft-4); padding: 6px 0 6px 20px; position: relative;
  border-top: 1px dashed var(--dash);
}
.agent-result li:first-child { border-top: 0; }
.agent-result li::before {
  content: "✓"; position: absolute; left: 0; top: 6px; color: var(--accent-text); font-size: 11px;
}
.agent-result .foot { font-size: 11.5px; color: var(--muted-2); margin-top: 10px; }

.panel-input {
  display: flex; align-items: center; gap: 10px;
  margin: 0 15px 15px; padding: 10px 12px;
  border: 1px solid var(--line); border-radius: 11px;
  background: var(--raise-3);
  font-size: 12.5px; color: var(--muted-2);
}
.panel-input #panel-placeholder { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.panel-input .send {
  width: 22px; height: 22px; border-radius: 7px; display: grid; place-items: center;
  background: var(--raise-2); color: var(--muted); font-size: 12px;
}

.stage-bar {
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
  margin-top: 18px;
}
.stage-label { font-size: 12.5px; color: var(--muted-2); }
.chips { display: flex; gap: 8px; flex-wrap: wrap; margin-left: auto; }
.chip {
  font: inherit; font-size: 13px; color: var(--muted);
  background: var(--raise-1); border: 1px solid var(--line);
  padding: 7px 13px; border-radius: 999px; cursor: pointer;
  transition: color .16s, border-color .16s, background .16s;
}
.chip:hover { color: var(--text); border-color: var(--line-strong); }
.chip.is-active { color: var(--accent-ink); background: var(--accent); border-color: var(--accent); font-weight: 600; }
.chip.replay { color: var(--muted-2); }
.chip.replay:hover { color: var(--accent-text); }

/* ---------- generic section ---------- */
.section { padding: 96px 24px 0; }
.section-head { max-width: 640px; margin-bottom: 44px; }
.kicker { font-family: var(--mono); font-size: 11px; letter-spacing: .2em; color: var(--accent-text); }
.section-head h2, .models h2, .final h2 { font-size: clamp(26px, 3.6vw, 38px); margin-top: 14px; }
.section-head p { color: var(--muted); margin-top: 16px; font-size: 15.5px; }

/* ---------- pipeline ---------- */
.pipeline { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.pipeline li {
  min-width: 0;
  position: relative; padding: 22px 20px 20px;
  border: 1px solid var(--line); border-radius: var(--radius);
  background: linear-gradient(180deg, var(--card-grad-1), var(--card-grad-2));
  transition: border-color .2s, transform .2s;
}
.pipeline li:hover { border-color: var(--accent-line-hover); transform: translateY(-3px); }
.pipeline li::after {
  content: ""; position: absolute; top: 34px; right: -16px; width: 16px; height: 1px;
  background: linear-gradient(90deg, var(--line-strong), transparent);
}
.pipeline li:last-child::after { display: none; }
.step-no { font-family: var(--mono); font-size: 11px; color: var(--accent-text); letter-spacing: .12em; }
.pipeline h3 { font-size: 16.5px; margin: 12px 0 8px; }
.pipeline p { font-size: 13.5px; color: var(--muted); line-height: 1.7; }
.pipeline code {
  display: inline-block; margin-top: 14px; font-size: 11.5px; color: var(--ink-soft-5);
  background: var(--inset-bg); border: 1px solid var(--line);
  padding: 3px 8px; border-radius: 6px;
}
.loop-note {
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  margin-top: 22px; padding: 15px 20px;
  border: 1px dashed var(--line-strong); border-radius: var(--radius);
  font-size: 13.5px; color: var(--muted);
}
.loop-badge {
  font-family: var(--mono); font-size: 11px; color: var(--violet);
  border: 1px solid var(--violet-line-strong); background: var(--violet-soft);
  padding: 3px 9px; border-radius: 6px;
}

/* ---------- cards ---------- */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.card {
  min-width: 0;
  padding: 24px 22px; border: 1px solid var(--line); border-radius: var(--radius);
  background: linear-gradient(180deg, var(--card-grad-1), var(--card-grad-2));
  transition: border-color .2s, transform .2s, background .2s;
}
.card:hover { border-color: var(--line-strong); transform: translateY(-3px); background: linear-gradient(180deg, var(--card-grad-h1), var(--card-grad-h2)); }
.card.wide { grid-column: span 2; }
.card-icon {
  width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center;
  font-size: 15px; color: var(--accent-text);
  background: var(--accent-soft); border: 1px solid var(--accent-line-soft);
}
.card.alt .card-icon { color: var(--violet); background: var(--violet-soft); border-color: var(--violet-line); }
.card h3 { font-size: 17px; margin: 16px 0 9px; }
.card p { font-size: 13.8px; color: var(--muted); line-height: 1.72; }
.mini-flow {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-top: 16px;
  font-family: var(--mono); font-size: 11.5px;
}
.mini-flow span { color: var(--ink-soft-4); background: var(--inset-bg); border: 1px solid var(--line); padding: 3px 8px; border-radius: 6px; }
.mini-flow i { color: var(--muted-2); font-style: normal; }
.mini-flow.muted span { color: var(--muted); }

/* ---------- models ---------- */
.models { padding: 96px 24px 0; text-align: center; }
.models h2 { margin-top: 14px; }
.models-copy { max-width: 620px; margin: 16px auto 0; color: var(--muted); font-size: 15.5px; }
.model-row { display: flex; justify-content: center; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.model {
  font-family: var(--mono); font-size: 13.5px; color: var(--ink-soft-2);
  border: 1px solid var(--line); background: var(--raise-1);
  padding: 10px 20px; border-radius: 11px;
  transition: border-color .2s, color .2s;
}
.model:hover { border-color: var(--accent-line-strong); color: var(--text-strong); }
.model.ghost { color: var(--muted); border-style: dashed; }
.models-foot { margin-top: 26px; font-size: 12.8px; color: var(--muted-2); }

/* ---------- install ---------- */
/* path 1: Chrome Web Store card */
.store-card {
  display: flex; align-items: flex-start; justify-content: space-between;
  gap: 24px; flex-wrap: wrap;
  padding: 26px 26px 24px;
  border: 1px solid var(--accent-line); border-radius: var(--radius);
  background: linear-gradient(180deg, var(--accent-soft), transparent 70%);
}
.store-card-main { max-width: 620px; }
.store-badge {
  display: inline-block; font-family: var(--mono); font-size: 10.5px;
  letter-spacing: .12em; color: var(--accent-text);
  border: 1px solid var(--accent-line); background: var(--accent-soft);
  padding: 2px 8px; border-radius: 5px;
}
.store-card h3 { font-size: 19px; margin: 12px 0 9px; }
.store-card p { font-size: 14px; color: var(--muted); line-height: 1.75; }
.store-cta { margin-top: 18px; }
.store-note { margin-top: 14px; font-size: 12.5px; color: var(--muted-2); }
.store-aside {
  display: flex; flex-direction: column; align-items: center; gap: 12px;
  padding-top: 4px; align-self: center;
}
.store-aside img {
  width: 76px; height: 76px; display: block; border-radius: 20px;
  filter: drop-shadow(0 8px 22px rgba(45,212,191,.32));
}
.store-aside span {
  font-family: var(--mono); font-size: 11.5px; color: var(--muted-2);
  text-align: center; white-space: nowrap;
}
.install-divider {
  display: flex; align-items: center; gap: 14px;
  margin: 34px 0 4px;
  font-size: 13px; color: var(--muted-2); white-space: nowrap;
}
.install-divider::before, .install-divider::after {
  content: ""; flex: 1 1 auto; height: 1px; background: var(--line);
}

.install-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 22px; }
.install-step {
  /* grid items default to min-width:auto, which would let the code block's
     min-content width blow column 1 out to 475px while the others stay at 303px */
  min-width: 0;
  padding: 24px 22px; border: 1px solid var(--line); border-radius: var(--radius);
  background: linear-gradient(180deg, var(--card-grad-1), var(--card-grad-2));
}
.install-step .code { min-width: 0; }
.install-step h3 { font-size: 17px; margin: 12px 0 9px; }
.install-step > p { font-size: 13.8px; color: var(--muted); line-height: 1.72; }
.install-step .hint { margin-top: 12px; font-size: 12.5px; color: var(--muted-2); }
code.inline {
  font-size: 12.5px; color: var(--ink-soft);
  background: var(--inset-bg); border: 1px solid var(--line);
  padding: 2px 6px; border-radius: 5px;
}
.path-pill {
  margin-top: 14px; font-family: var(--mono); font-size: 12.5px; color: var(--accent-text);
  background: var(--inset-bg); border: 1px solid var(--accent-line-soft);
  padding: 8px 12px; border-radius: 8px;
}
.prompt-card {
  margin-top: 16px; padding: 12px 14px; border-radius: 10px;
  border: 1px solid var(--line); background: var(--inset-bg-soft);
}
.prompt-label { font-family: var(--mono); font-size: 10.5px; letter-spacing: .12em; color: var(--muted-2); }
.prompt-card p { margin-top: 7px; font-size: 13.5px; color: var(--ink-soft); }

.code {
  margin-top: 16px; border: 1px solid var(--line); border-radius: 10px;
  background: var(--code-bg); overflow: hidden;
}
.code-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 7px 12px; border-bottom: 1px solid var(--line);
  font-family: var(--mono); font-size: 10.5px; color: var(--muted-2); letter-spacing: .1em;
}
.copy {
  font: inherit; font-size: 11px; color: var(--muted);
  background: var(--raise-2); border: 1px solid var(--line);
  padding: 3px 10px; border-radius: 6px; cursor: pointer;
  transition: color .16s, background .16s, border-color .16s;
}
.copy:hover { color: var(--accent-text); border-color: var(--accent-line-strong); }
.copy.done { color: var(--accent-text); border-color: var(--accent-line-stronger); }
.code pre { margin: 0; padding: 14px; overflow-x: auto; }
.code code { font-size: 12.5px; line-height: 1.85; color: var(--ink-soft-3); white-space: pre; }

.install-cta { display: flex; gap: 12px; justify-content: center; margin-top: 34px; flex-wrap: wrap; }

/* ---------- faq ---------- */
.faq { border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary {
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  padding: 20px 4px; cursor: pointer; font-size: 16px; font-weight: 600;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary .plus { color: var(--muted-2); font-weight: 400; transition: transform .25s, color .25s; }
.faq details[open] summary .plus { transform: rotate(45deg); color: var(--accent-text); }
.faq details p {
  padding: 0 4px 22px; margin: 0; max-width: 760px;
  font-size: 14.2px; color: var(--muted); line-height: 1.78;
}

/* ---------- final ---------- */
.final { padding: 110px 24px 90px; text-align: center; }
.final p { color: var(--muted); margin-top: 14px; font-size: 16px; }

/* ---------- footer ---------- */
.foot { border-top: 1px solid var(--line); background: var(--foot-bg); }
.foot-inner {
  display: flex; align-items: center; gap: 22px; flex-wrap: wrap;
  padding-top: 30px; padding-bottom: 34px;
}
.foot nav { display: flex; gap: 18px; flex-wrap: wrap; margin-left: auto; }
.foot nav a { font-size: 13.5px; color: var(--muted); transition: color .16s; }
.foot nav a:hover { color: var(--accent-text); }
.foot small { width: 100%; font-size: 12.5px; color: var(--muted-2); }

/* ---------- reveal ---------- */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .6s ease, transform .6s cubic-bezier(.22,.8,.3,1); }
.reveal.is-in { opacity: 1; transform: none; }

/* ---------- footer bottom row (copyright left, legal link bottom-right) ---------- */
.foot-bottom {
  width: 100%; display: flex; align-items: center; justify-content: space-between;
  gap: 12px 20px; flex-wrap: wrap;
}
.foot-bottom small { width: auto; margin: 0; }
.foot-legal {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12.5px; color: var(--muted-2); white-space: nowrap;
  transition: color .16s;
}
.foot-legal svg { width: 14px; height: 14px; flex: none; }
.foot-legal:hover { color: var(--accent-text); }

/* ---------- terms & privacy document ---------- */
/* both language halves live in the markup; only one is ever displayed */
.doc-zh, .doc-en { display: none; }
html[lang^="zh"] .doc-zh { display: block; }
html[lang="en"] .doc-en { display: block; }

.doc-wrap { width: 100%; max-width: 820px; margin: 0 auto; padding: 0 24px; }

.doc-head { padding: 68px 0 26px; border-bottom: 1px solid var(--line); }
.doc-head h1 { font-size: clamp(28px, 4.2vw, 42px); margin-top: 14px; }
.doc-meta { margin-top: 16px; font-size: 12.5px; color: var(--muted-2); font-family: var(--mono); }

.doc { padding-bottom: 20px; }
.doc section { padding: 32px 0; border-bottom: 1px solid var(--line); }
.doc section:last-child { border-bottom: 0; padding-bottom: 8px; }
.doc h2 { font-size: 20px; display: flex; align-items: baseline; gap: 12px; }
.doc h2 .n {
  font-family: var(--mono); font-size: 12px; letter-spacing: .1em;
  color: var(--accent-text); flex: none;
}
.doc h3 { font-size: 15.5px; margin-top: 28px; color: var(--text); }
.doc p { margin-top: 14px; font-size: 15px; line-height: 1.85; color: var(--muted); }
.doc ul { margin: 14px 0 0; padding-left: 22px; font-size: 15px; line-height: 1.85; color: var(--muted); }
.doc li { margin-top: 9px; }
.doc li::marker { color: var(--accent-text); }
.doc strong { color: var(--text); font-weight: 600; }
.doc a { color: var(--accent-text); text-decoration: underline; text-underline-offset: 2px; text-decoration-thickness: 1px; }
.doc a:hover { text-decoration-thickness: 2px; }
.doc code {
  font-size: 12.8px; color: var(--ink-soft);
  background: var(--inset-bg); border: 1px solid var(--line);
  padding: 1px 6px; border-radius: 5px;
}
.doc table { width: 100%; border-collapse: collapse; margin-top: 18px; font-size: 14px; }
.doc th, .doc td { text-align: left; padding: 11px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
.doc th {
  font-family: var(--mono); font-size: 11.5px; letter-spacing: .06em;
  color: var(--muted-2); font-weight: 600;
}
.doc td { color: var(--muted); line-height: 1.7; }
.doc td:first-child { color: var(--text); font-family: var(--mono); font-size: 12.8px; }
.doc-note {
  margin-top: 20px; padding: 14px 16px; border-radius: 12px;
  border: 1px solid var(--accent-line); background: var(--accent-soft);
  color: var(--text) !important; font-size: 14px !important;
}
.doc-note strong { color: var(--accent-text); }
.doc-foot { padding: 34px 0 90px; border-top: 1px solid var(--line); }

@media (max-width: 640px) {
  .doc-head { padding-top: 46px; }
  .doc h2 { font-size: 18px; gap: 9px; }
  .doc th, .doc td { padding: 9px 8px; font-size: 13.2px; }
  .doc td:first-child { font-size: 12.2px; }
}

/* ---------- responsive ---------- */
@media (max-width: 1020px) {
  .window-body { grid-template-columns: 1fr 310px; }
  .cards { grid-template-columns: repeat(2, 1fr); }
  .card.wide { grid-column: span 2; }
  .pipeline { grid-template-columns: repeat(2, 1fr); }
  .pipeline li::after { display: none; }
  .install-grid { grid-template-columns: 1fr; }
}

/* the full nav (links + theme switch + language + GitHub + stars + CTA) needs
   ~975px at these font metrics; the section links drop out first, with headroom
   for platforms whose fonts run wider */
@media (max-width: 1000px) {
  .nav-links { display: none; }
}

@media (max-width: 860px) {
  .nav-actions .ghost-btn { display: none; }
  .window-body { grid-template-columns: 1fr; }
  .panel { border-left: 0; border-top: 1px solid var(--line); }
  .page-cols { grid-template-columns: 1fr; }
  .page-side { display: none; }
  .stage-bar { flex-direction: column; align-items: flex-start; }
  .chips { margin-left: 0; }
}

@media (max-width: 640px) {
  body { font-size: 15.5px; }
  .hero { padding-top: 52px; }
  .hero-facts { gap: 8px 18px; font-size: 12.5px; }
  .section, .models { padding-top: 72px; }
  .cards { grid-template-columns: 1fr; }
  .card.wide { grid-column: span 1; }
  .pipeline { grid-template-columns: 1fr; }
  .page { padding: 22px 20px; }
  .window { border-radius: 14px; }
  .final { padding: 80px 24px 64px; }
  .foot-inner { flex-direction: column; align-items: flex-start; }
  .foot nav { margin-left: 0; }
}

@media (max-width: 520px) {
  .theme-switch { width: 56px; height: 30px; }
  .ts-knob { top: 3px; left: 3px; width: 24px; height: 24px; }
  [data-theme="dark"] .ts-knob { transform: translateX(26px); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}