/* Tuantuan landing page. Tokens mirror web/src/styles.css ("Tuantuan modern"); theme follows the system. */
@font-face {
  font-family: "Plus Jakarta Sans Variable";
  font-style: normal;
  font-display: swap;
  font-weight: 200 800;
  src: url(fonts/plus-jakarta-sans-latin-ext.woff2) format("woff2-variations");
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF,
    U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: "Plus Jakarta Sans Variable";
  font-style: normal;
  font-display: swap;
  font-weight: 200 800;
  src: url(fonts/plus-jakarta-sans-latin.woff2) format("woff2-variations");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329,
    U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

:root {
  color-scheme: light dark;
  --font: "Plus Jakarta Sans Variable", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --paper: #ffffff;
  --bg: #f5f5f3;
  --surface: #ffffff;
  --surface-2: #f1f1ef;
  --surface-hover: #ecece9;
  --border: rgb(24 24 27 / 0.08);
  --border-strong: rgb(24 24 27 / 0.14);
  --text: #18181a;
  --text-2: #55555b;
  --text-3: #85858c;
  --ink: #1d1d20;
  --on-ink: #ffffff;
  --brand: #f2553c;
  --accent: #e8462b;
  --accent-hover: #d63c22;
  --accent-soft: rgb(242 85 60 / 0.1);
  --accent-text: #d03b20;
  --on-accent: #ffffff;
  --danger: #dc3a2a;
  --danger-soft: rgb(220 58 42 / 0.08);
  --ok: #1a8a4f;
  --ok-soft: rgb(31 157 90 / 0.1);
  --code-bg: #1d1d20;
  --code-border: transparent;
  --shadow-1: 0 1px 2px rgb(24 24 27 / 0.05), 0 1px 1px rgb(24 24 27 / 0.03);
  --shadow-2: 0 2px 4px rgb(24 24 27 / 0.04), 0 12px 32px -8px rgb(24 24 27 / 0.16), 0 0 0 1px rgb(24 24 27 / 0.06);
  --shadow-3: 0 2px 6px rgb(24 24 27 / 0.04), 0 30px 70px -24px rgb(24 24 27 / 0.28), 0 0 0 1px rgb(24 24 27 / 0.06);
  --focus: 0 0 0 2px var(--bg), 0 0 0 4px color-mix(in srgb, var(--accent) 60%, transparent);
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  --wrap: 1120px;
  --gutter: clamp(20px, 4vw, 32px);
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #161618;
    --bg: #111113;
    --surface: #18181a;
    --surface-2: #212124;
    --surface-hover: #242427;
    --border: rgb(255 255 255 / 0.08);
    --border-strong: rgb(255 255 255 / 0.14);
    --text: #f2f2f3;
    --text-2: #b4b4ba;
    --text-3: #83838b;
    --ink: #f2f2f3;
    --on-ink: #111113;
    --brand: #ff6a4d;
    --accent: #ff6a4d;
    --accent-hover: #ff8166;
    --accent-soft: rgb(255 106 77 / 0.14);
    --accent-text: #ff8a70;
    --on-accent: #1a0d0a;
    --danger: #ff6b5a;
    --danger-soft: rgb(255 107 90 / 0.12);
    --ok: #4fd18b;
    --ok-soft: rgb(79 209 139 / 0.12);
    --code-bg: #0b0b0c;
    --code-border: rgb(255 255 255 / 0.08);
    --shadow-1: 0 1px 2px rgb(0 0 0 / 0.4);
    --shadow-2: 0 16px 40px -8px rgb(0 0 0 / 0.6), 0 0 0 1px rgb(255 255 255 / 0.08);
    --shadow-3: 0 30px 80px -20px rgb(0 0 0 / 0.75), 0 0 0 1px rgb(255 255 255 / 0.09);
  }
}
:lang(zh-TW) {
  --font: "Plus Jakarta Sans Variable", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang TC", "Microsoft JhengHei",
    "Noto Sans CJK TC", sans-serif;
}
:lang(ja) {
  word-break: auto-phrase;
  --font: "Plus Jakarta Sans Variable", -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Hiragino Kaku Gothic ProN",
    "Yu Gothic UI", "Meiryo", "Noto Sans CJK JP", sans-serif;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 76px; }
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
}
h1, h2, h3 { text-wrap: balance; }
p { text-wrap: pretty; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; }
code, pre { font-family: var(--mono); font-variant-ligatures: none; }
.mono, .diff { font-family: var(--mono); font-variant-ligatures: none; }
:focus { outline: none; }
:focus-visible { outline: none; box-shadow: var(--focus); border-radius: 8px; }
::selection { background: color-mix(in srgb, var(--accent) 24%, transparent); }
.wrap { width: 100%; max-width: calc(var(--wrap) + var(--gutter) * 2); margin-inline: auto; padding-inline: var(--gutter); }
.skip { position: absolute; left: 12px; top: -60px; z-index: 100; padding: 10px 14px; border-radius: 10px; background: var(--surface); box-shadow: var(--shadow-2); font-size: 14px; font-weight: 600; transition: top 0.15s; }
.skip:focus { top: 12px; }

/* ---------- header ---------- */
.top { position: sticky; top: 0; z-index: 50; background: color-mix(in srgb, var(--bg) 80%, transparent); -webkit-backdrop-filter: saturate(1.6) blur(14px); backdrop-filter: saturate(1.6) blur(14px); border-bottom: 1px solid transparent; transition: border-color 0.2s; }
.top.scrolled { border-bottom-color: var(--border); }
.top-in { height: 60px; display: flex; align-items: center; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-size: 16px; font-weight: 700; letter-spacing: -0.01em; white-space: nowrap; border-radius: 8px; }
.nav { display: flex; gap: 2px; margin-inline: auto; }
.nav a { padding: 6px 12px; border-radius: 8px; font-size: 14px; font-weight: 500; color: var(--text-2); transition: color 0.15s, background 0.15s; }
.nav a:hover { color: var(--text); background: var(--surface-hover); }
.top-actions { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.nav + .top-actions { margin-left: 0; }
.icon-btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; height: 36px; min-width: 36px; padding: 0 9px; border: 0; border-radius: 10px; background: transparent; color: var(--text-2); font-size: 14px; font-weight: 500; transition: color 0.15s, background 0.15s; }
.icon-btn:hover { color: var(--text); background: var(--surface-hover); }
.lang { position: relative; }
.lang .chev { color: var(--text-3); transition: transform 0.2s var(--ease); }
.lang.open .chev { transform: rotate(180deg); }
.lang-menu { position: absolute; right: 0; top: calc(100% + 8px); min-width: 176px; margin: 0; padding: 6px; list-style: none; background: var(--surface); border-radius: 14px; box-shadow: var(--shadow-2); transform-origin: top right; animation: pop 0.18s var(--ease); }
.lang-menu a { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 8px 10px; border-radius: 9px; font-size: 14px; color: var(--text-2); transition: background 0.12s, color 0.12s; }
.lang-menu a:hover, .lang-menu a:focus-visible { background: var(--surface-hover); color: var(--text); box-shadow: none; }
.lang-menu a[aria-current] { color: var(--text); font-weight: 600; }
.lang-menu svg { color: var(--accent); }
@keyframes pop { from { opacity: 0; transform: translateY(-4px) scale(0.97); } }

/* ---------- buttons ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 9px; height: 46px; padding: 0 20px; border-radius: 12px; border: 1px solid transparent; font-size: 15px; font-weight: 650; white-space: nowrap; transition: background 0.16s, border-color 0.16s, color 0.16s, transform 0.16s var(--ease), box-shadow 0.16s; }
.btn:active { transform: translateY(0.5px); }
.btn-primary { background: var(--accent); color: var(--on-accent); box-shadow: 0 1px 2px rgb(24 24 27 / 0.12), inset 0 1px 0 rgb(255 255 255 / 0.16); }
.btn-primary:hover { background: var(--accent-hover); transform: translateY(-1px); box-shadow: 0 8px 20px -8px color-mix(in srgb, var(--accent) 70%, transparent); }
.btn-quiet { background: var(--surface); border-color: var(--border-strong); color: var(--text); }
.btn-quiet:hover { background: var(--surface-hover); transform: translateY(-1px); }
.btn-small { height: 32px; padding: 0 12px; gap: 7px; border-radius: 9px; font-size: 13px; font-weight: 600; background: var(--surface); border-color: var(--border); color: var(--text-2); }
.btn-small:hover { color: var(--text); border-color: var(--border-strong); }

/* ---------- hero ---------- */
.hero { position: relative; padding-top: clamp(56px, 9vw, 104px); }
.hero::before { content: ""; position: absolute; inset: -60px 0 auto; height: 620px; z-index: -1; pointer-events: none; background: radial-gradient(52% 60% at 50% 0%, color-mix(in srgb, var(--brand) 9%, transparent), transparent 72%); }
.hero-in { text-align: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; height: 30px; margin: 0; padding: 0 13px; border-radius: 99px; background: var(--surface); box-shadow: 0 0 0 1px var(--border-strong); font-size: 13px; font-weight: 600; color: var(--text-2); }
.eyebrow-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--brand); box-shadow: 0 0 0 3px var(--accent-soft); }
.hero h1 { margin: 22px 0 0; font-size: clamp(46px, 7.4vw, 80px); font-weight: 800; line-height: 1.02; letter-spacing: -0.035em; }
.tagline { margin: 16px auto 0; max-width: 760px; font-size: clamp(20px, 2.5vw, 27px); font-weight: 650; line-height: 1.3; letter-spacing: -0.015em; }
.lede { margin: 14px auto 0; max-width: 600px; font-size: 17px; color: var(--text-2); }
.cta { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-top: 30px; }
.meta { margin: 16px auto 0; max-width: 640px; font-size: 13.5px; color: var(--text-3); }
.meta a, .start-links a, .video-full a { display: inline-flex; align-items: center; gap: 4px; color: var(--text-2); font-weight: 600; transition: color 0.15s; }
.meta a:hover, .video-full a:hover { color: var(--accent-text); }

/* macOS first-launch hint: quiet disclosure under the download button */
.mac-first { margin: 14px auto 0; max-width: 560px; text-align: left; border-radius: 14px; background: var(--surface); box-shadow: 0 0 0 1px var(--border); transition: box-shadow 0.2s; }
.mac-first[open] { box-shadow: 0 0 0 1px var(--border-strong), var(--shadow-1); }
.mac-first summary { display: flex; align-items: center; justify-content: center; gap: 7px; min-height: 40px; padding: 0 14px; list-style: none; cursor: pointer; border-radius: 14px; font-size: 13.5px; font-weight: 600; color: var(--text-2); transition: color 0.15s; }
.mac-first summary::-webkit-details-marker { display: none; }
.mac-first summary:hover, .mac-first[open] summary { color: var(--text); }
.mac-first summary:focus-visible { outline: none; box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 60%, transparent); }
.mac-first-chev { transition: transform 0.2s var(--ease); }
.mac-first[open] .mac-first-chev { transform: rotate(180deg); }
.mac-first-body { padding: 2px 18px 18px; font-size: 14px; line-height: 1.6; color: var(--text-2); }
.mac-first[open] .mac-first-body { animation: mac-first-in 0.22s var(--ease); }
@keyframes mac-first-in { from { opacity: 0; transform: translateY(-4px); } }
.mac-first-body p { margin: 10px 0 0; }
.mac-first-body blockquote { margin: 8px 0 0; padding: 8px 12px; border-left: 3px solid var(--border-strong); border-radius: 0 8px 8px 0; background: var(--surface-2); color: var(--text); font-size: 13.5px; }
.mac-first-body ol { margin: 12px 0 0; padding-left: 20px; display: grid; gap: 4px; }
.mac-first-body .code { margin-top: 10px; }
.mac-first-body .code pre { font-size: 12.5px; }
@media (prefers-reduced-motion: reduce) { .mac-first[open] .mac-first-body, .mac-first-chev { animation: none; transition: none; } }

.video { position: relative; margin: clamp(44px, 6vw, 64px) auto 0; max-width: 1040px; aspect-ratio: 16 / 9; border-radius: 18px; overflow: hidden; background: var(--surface); box-shadow: var(--shadow-3); isolation: isolate; }
.video video { display: block; width: 100%; height: 100%; object-fit: cover; cursor: pointer; }
.video-play { position: absolute; left: 50%; top: 50%; width: 68px; height: 68px; margin: -34px 0 0 -34px; display: grid; place-items: center; border: 0; border-radius: 50%; color: #fff; background: rgb(17 17 19 / 0.62); -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px); box-shadow: 0 10px 30px -10px rgb(0 0 0 / 0.5); transition: transform 0.2s var(--ease), opacity 0.2s, background 0.2s; }
.video-play svg { margin-left: 3px; }
.video-play:hover { transform: scale(1.05); background: rgb(17 17 19 / 0.75); }
.video.playing .video-play { opacity: 0; pointer-events: none; transform: scale(0.92); }
.video-ctl { position: absolute; right: 14px; bottom: 14px; display: flex; gap: 6px; opacity: 0; transform: translateY(4px); transition: opacity 0.2s, transform 0.2s var(--ease); }
.video:hover .video-ctl, .video:focus-within .video-ctl, .video:not(.playing) .video-ctl { opacity: 1; transform: none; }
@media (hover: none) { .video-ctl { opacity: 1; transform: none; } }
.on-media { color: #fff; background: rgb(17 17 19 / 0.55); -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px); }
.on-media:hover { color: #fff; background: rgb(17 17 19 / 0.72); }
.video .i-pause, .video.playing .i-play, .video .i-sound, .video.muted .i-sound { display: none; }
.video.playing .i-pause, .video:not(.muted) .i-sound { display: block; }
.video:not(.muted) .i-muted { display: none; }
.video:not(.playing) [data-act="toggle"] { display: none; }
.video-full { margin: 16px 0 0; text-align: center; font-size: 14px; }

/* ---------- sections ---------- */
.section { padding-block: clamp(84px, 11vw, 136px) 0; }
.sec-head { max-width: 700px; margin: 0 auto clamp(36px, 5vw, 52px); text-align: center; }
.sec-head.left { margin: 0; text-align: left; }
h2 { margin: 0; font-size: clamp(30px, 4.2vw, 44px); font-weight: 750; line-height: 1.1; letter-spacing: -0.028em; }
.sub { margin: 14px 0 0; font-size: 17px; color: var(--text-2); }
.sec-head:not(.left) .sub { margin-inline: auto; max-width: 600px; }

/* ---------- handoff ---------- */
.ho-grid { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: clamp(40px, 6vw, 72px); align-items: center; }
.steps { display: grid; gap: 6px; margin: 32px 0 0; padding: 0; list-style: none; }
.step { position: relative; display: grid; grid-template-columns: 28px 1fr; gap: 14px; width: 100%; padding: 15px 16px 17px; border: 1px solid transparent; border-radius: 14px; background: transparent; text-align: left; overflow: hidden; transition: background 0.25s, border-color 0.25s, box-shadow 0.25s; }
.step:hover { background: var(--surface-hover); }
.step.active { background: var(--surface); border-color: var(--border); box-shadow: var(--shadow-1); }
.step-n { display: grid; place-items: center; width: 28px; height: 28px; border-radius: 50%; box-shadow: inset 0 0 0 1.5px var(--border-strong); font-size: 13px; font-weight: 700; color: var(--text-3); transition: background 0.25s, color 0.25s, box-shadow 0.25s; }
.step.active .step-n { background: var(--accent); color: var(--on-accent); box-shadow: none; }
.step.done .step-n { background: var(--ok-soft); color: var(--ok); box-shadow: none; }
.step-t { display: grid; gap: 3px; padding-top: 2px; }
.step-t b { font-size: 16px; font-weight: 650; line-height: 1.35; color: var(--text-2); transition: color 0.25s; }
.step-t span { font-size: 14.5px; line-height: 1.55; color: var(--text-3); transition: color 0.25s; }
.step.active b { color: var(--text); }
.step.active .step-t span { color: var(--text-2); }
.step-bar { position: absolute; left: 16px; right: 16px; bottom: 0; height: 2px; border-radius: 2px; overflow: hidden; opacity: 0; transition: opacity 0.25s; }
.step.active .step-bar { opacity: 1; }
.step-bar i { display: block; width: 0; height: 100%; background: var(--accent); }
.demo-ctl { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 18px; padding-left: 16px; }
[data-demo="toggle"] .i-play, [data-demo="toggle"].paused .i-pause { display: none; }
[data-demo="toggle"].paused .i-play { display: block; }
.caption { margin-left: 6px; font-size: 12.5px; color: var(--text-3); }

.win { border-radius: 18px; background: var(--surface); box-shadow: var(--shadow-3); overflow: hidden; }
.win-bar { display: flex; align-items: center; gap: 12px; height: 50px; padding: 0 16px; border-bottom: 1px solid var(--border); background: color-mix(in srgb, var(--surface-2) 45%, var(--surface)); }
.dots { display: flex; gap: 6px; flex: none; }
.dots i { width: 10px; height: 10px; border-radius: 50%; background: var(--border-strong); }
.win-title { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 13.5px; font-weight: 650; }
.hash { margin-right: 5px; color: var(--text-3); font-weight: 500; }
.members { display: flex; gap: 4px; flex: none; }
.goal { display: inline-flex; flex: none; align-items: center; gap: 6px; height: 24px; padding: 0 9px 0 6px; border-radius: 99px; background: var(--surface-2); font-size: 12px; font-weight: 600; color: var(--text-2); transition: background 0.35s, color 0.35s; }
.goal-ck { display: grid; place-items: center; width: 14px; height: 14px; border-radius: 50%; box-shadow: inset 0 0 0 1.5px var(--text-3); color: transparent; transition: background 0.35s, box-shadow 0.35s, color 0.35s; }
.goal.done { background: var(--ok-soft); color: var(--ok); }
.goal.done .goal-ck { background: var(--ok); box-shadow: none; color: var(--surface); }

.log { display: flex; flex-direction: column; justify-content: flex-end; height: 468px; padding: 8px 18px 18px; overflow: hidden; -webkit-mask-image: linear-gradient(to bottom, transparent 0, #000 64px); mask-image: linear-gradient(to bottom, transparent 0, #000 64px); transition: opacity 0.4s; }
.demo.resetting .log { opacity: 0; }
.it { display: grid; grid-template-rows: 0fr; opacity: 0; transform: translateY(8px); transition: grid-template-rows 0.5s var(--ease), opacity 0.4s ease 0.06s, transform 0.5s var(--ease); }
.it.on { grid-template-rows: 1fr; opacity: 1; transform: none; }
.it-in { min-height: 0; overflow: hidden; padding-top: 14px; }
.row-agent .it-in { padding-left: 34px; }
.row-agent.cont .it-in { padding-top: 8px; }
.row-user .it-in { display: flex; justify-content: flex-end; }
.demo.jump .it, .demo.jump .it *, .demo.jump .goal, .demo.jump .goal * { transition: none !important; }
.bubble { max-width: 84%; padding: 9px 14px; border-radius: 16px 16px 4px 16px; background: var(--surface-2); font-size: 14px; line-height: 1.5; }
.mention { color: var(--accent-text); font-weight: 650; }
.who { display: flex; align-items: center; gap: 10px; margin: 0 0 7px -34px; font-size: 13px; }
.who b { font-weight: 650; }
.say { margin: 0; font-size: 14px; line-height: 1.55; }
.chip { display: inline-flex; align-items: center; gap: 6px; border-radius: 99px; font-weight: 650; white-space: nowrap; }
.chip-stuck { height: 20px; margin-left: 8px; padding: 0 8px; vertical-align: 1px; font-size: 11.5px; background: var(--danger-soft); color: var(--danger); }
.chip-back { height: 28px; padding: 0 11px; font-size: 12.5px; background: var(--ok-soft); color: var(--ok); }

.tool { display: flex; align-items: center; gap: 10px; height: 38px; padding: 0 12px; border: 1px solid var(--border); border-radius: 10px; background: var(--surface); font-size: 13px; color: var(--text-2); transition: background 0.35s, border-color 0.35s, color 0.35s; }
.tool-ic { display: grid; flex: none; width: 14px; height: 14px; }
.tool-ic svg { grid-area: 1 / 1; transition: opacity 0.25s, transform 0.3s var(--ease); }
.tool .i-fail, .tool .i-ok { opacity: 0; transform: scale(0.6); }
.tool .i-run { color: var(--text-3); animation: spin 0.9s linear infinite; }
.tool.fail .i-run, .tool.ok .i-run { opacity: 0; animation: none; }
.tool.fail .i-fail, .tool.ok .i-ok { opacity: 1; transform: none; }
.tool-label { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 12.5px; }
.tool-status { flex: none; font-size: 12px; font-weight: 650; opacity: 0; transition: opacity 0.3s; }
.tool.fail { border-color: color-mix(in srgb, var(--danger) 26%, transparent); background: var(--danger-soft); color: var(--danger); }
.tool.ok { border-color: color-mix(in srgb, var(--ok) 28%, transparent); background: var(--ok-soft); color: var(--ok); }
.tool.fail .tool-status, .tool.ok .tool-status { opacity: 1; }
@keyframes spin { to { transform: rotate(360deg); } }

.handoff { border: 1px solid color-mix(in srgb, var(--accent) 32%, var(--border)); border-radius: 12px; background: var(--surface); overflow: hidden; }
.handoff.sent { animation: sent 0.9s var(--ease); }
@keyframes sent { 0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 35%, transparent); } 100% { box-shadow: 0 0 0 10px transparent; } }
.ho-head { display: flex; align-items: center; gap: 8px; padding: 9px 12px; background: var(--accent-soft); color: var(--accent-text); font-size: 13px; }
.ho-head b { font-weight: 700; }
.ho-to { display: inline-flex; align-items: center; gap: 6px; margin-left: auto; color: var(--text-2); font-weight: 600; }
.ho-rows { display: grid; margin: 0; padding: 4px 12px 6px; }
.ho-row { display: grid; grid-template-columns: minmax(72px, 22%) 1fr; gap: 12px; padding: 6px 0; font-size: 13px; line-height: 1.45; opacity: 0; transform: translateX(-6px); transition: opacity 0.35s, transform 0.4s var(--ease); }
.ho-row + .ho-row { border-top: 1px solid var(--border); }
.ho-row.on { opacity: 1; transform: none; }
.ho-row dt { color: var(--text-3); font-weight: 600; font-size: 12.5px; }
.ho-row dd { margin: 0; }
.ho-foot { display: flex; align-items: center; gap: 6px; max-height: 0; padding: 0 12px; overflow: hidden; border-top: 1px solid transparent; font-size: 12.5px; font-weight: 600; color: var(--ok); background: var(--ok-soft); opacity: 0; transition: max-height 0.4s var(--ease), padding 0.4s var(--ease), opacity 0.3s 0.1s, border-color 0.3s; }
.handoff.sent .ho-foot { max-height: 40px; padding-block: 8px; opacity: 1; border-top-color: var(--border); }

.diff { border: 1px solid var(--border); border-radius: 12px; overflow: hidden; background: var(--surface); font-family: var(--mono); font-size: 12.5px; }
.diff-head { display: flex; justify-content: space-between; gap: 12px; padding: 7px 12px; border-bottom: 1px solid var(--border); background: var(--surface-2); font-size: 12px; color: var(--text-2); }
.diff-head .add { color: var(--ok); }
.diff-head .del { color: var(--danger); }
.dl { display: grid; grid-template-columns: 26px 16px minmax(0, 1fr); padding-right: 12px; line-height: 1.75; opacity: 0; transform: translateY(3px); transition: opacity 0.3s, transform 0.35s var(--ease); transition-delay: calc(var(--i) * 120ms + 260ms); }
.it.on .dl { opacity: 1; transform: none; }
.dl code { overflow: hidden; text-overflow: ellipsis; white-space: pre; }
.dn { padding-right: 8px; text-align: right; color: var(--text-3); user-select: none; }
.dk { color: var(--text-3); text-align: center; }
.dl-add { background: color-mix(in srgb, var(--ok) 10%, transparent); }
.dl-add .dk { color: var(--ok); }
.dl-del { background: color-mix(in srgb, var(--danger) 9%, transparent); }
.dl-del .dk { color: var(--danger); }
.dl-del code { color: var(--text-2); }

.av { position: relative; display: inline-block; flex: none; }
.av > .bot-avatar { display: none; width: 100%; height: 100%; }
.av[data-expr="idle"] > [data-expr="idle"],
.av[data-expr="working"] > [data-expr="working"],
.av[data-expr="sad"] > [data-expr="sad"],
.av[data-expr="happy"] > [data-expr="happy"] { display: block; }
.sweat { position: absolute; right: -6%; top: -4%; width: 30%; fill: #6cb8ec; opacity: 0; transform: translateY(-2px); transition: opacity 0.3s, transform 0.4s var(--ease); }
.av[data-expr="sad"] .sweat { opacity: 1; transform: none; }

/* ---------- harnesses ---------- */
.harnesses { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; margin: 0; padding: 0; list-style: none; }
.harness, .harness-more a { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 14px; height: 136px; padding: 16px 10px; text-align: center; }
.harness { border-radius: 16px; background: var(--surface); box-shadow: 0 0 0 1px var(--border); transition: box-shadow 0.2s, transform 0.2s var(--ease); }
.harness:hover { box-shadow: 0 0 0 1px var(--border-strong), var(--shadow-1); transform: translateY(-2px); }
.harness-logo { display: grid; place-items: center; width: 32px; height: 32px; color: var(--text); }
.harness-name { display: grid; gap: 1px; font-size: 14px; font-weight: 650; line-height: 1.3; }
.harness-name small { font-size: 12px; font-weight: 500; color: var(--text-3); }
.harness-more { padding: 0; background: transparent; box-shadow: none; border: 1px dashed var(--border-strong); }
.harness-more:hover { box-shadow: none; border-color: var(--text-3); }
.harness-more a { position: relative; width: 100%; height: 100%; border-radius: 15px; color: var(--text-2); }
.harness-more .harness-logo { color: var(--text-3); }
.harness-arrow { position: absolute; top: 12px; right: 12px; color: var(--text-3); transition: transform 0.2s var(--ease), color 0.2s; }
.harness-more:hover .harness-arrow { transform: translate(2px, -2px); color: var(--accent-text); }

/* ---------- feature cards ---------- */
.cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; margin: 0; padding: 0; list-style: none; }
.card { padding: 26px 24px 28px; border-radius: 16px; background: var(--surface); box-shadow: 0 0 0 1px var(--border); transition: box-shadow 0.2s; }
.card:hover { box-shadow: 0 0 0 1px var(--border-strong), var(--shadow-1); }
.card-ic { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 11px; background: var(--surface-2); color: var(--text); transition: background 0.2s, color 0.2s; }
.card:hover .card-ic { background: var(--accent-soft); color: var(--accent-text); }
.card h3 { margin: 18px 0 8px; font-size: 17px; font-weight: 650; line-height: 1.35; letter-spacing: -0.01em; }
.card p { margin: 0; font-size: 14.5px; line-height: 1.6; color: var(--text-2); }

/* ---------- quick start ---------- */
.start-grid { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: clamp(32px, 6vw, 72px); align-items: start; }
.start-links { display: flex; flex-wrap: wrap; gap: 20px; margin: 22px 0 0; font-size: 14.5px; }
.start-links a:hover { color: var(--accent-text); }
.code { position: relative; border-radius: 14px; background: var(--code-bg); box-shadow: 0 0 0 1px var(--code-border); color: #e9e9eb; }
.code pre { margin: 0; padding: 16px 56px 16px 18px; overflow-x: auto; font-size: 13.5px; line-height: 1.85; }
.ln { display: block; white-space: pre; }
.prompt { margin-right: 12px; color: #7c7c84; user-select: none; }
.copy { position: absolute; top: 9px; right: 9px; color: #a6a6ad; }
.copy:hover { color: #fff; background: rgb(255 255 255 / 0.08); }
.copy .i-done, .copy.done .i-copy { display: none; }
.copy.done .i-done { display: block; color: #4fd18b; }
.copy:focus-visible { box-shadow: 0 0 0 2px var(--code-bg), 0 0 0 4px color-mix(in srgb, var(--accent) 60%, transparent); }
.note { margin: 18px 0 10px; font-size: 14.5px; color: var(--text-2); }
.note.muted { margin-top: 16px; font-size: 13.5px; color: var(--text-3); }

/* ---------- footer ---------- */
.foot { margin-top: clamp(96px, 12vw, 144px); border-top: 1px solid var(--border); padding: 44px 0 52px; }
.foot-in { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 28px 48px; align-items: start; }
.tm { max-width: 480px; margin: 14px 0 0; font-size: 12.5px; line-height: 1.6; color: var(--text-3); }
.foot-links { display: grid; grid-template-columns: repeat(3, auto); gap: 10px 32px; padding-top: 2px; }
.foot-links a, .foot-langs a { font-size: 14px; color: var(--text-2); transition: color 0.15s; }
.foot-links a:hover, .foot-langs a:hover { color: var(--text); }
.foot-langs { grid-column: 1 / -1; display: flex; flex-wrap: wrap; gap: 8px 20px; padding-top: 22px; border-top: 1px solid var(--border); }
.foot-langs a { font-size: 13px; color: var(--text-3); }
.copyright { margin-left: auto; font-size: 13px; color: var(--text-3); }
.foot-langs a[aria-current] { color: var(--text); font-weight: 600; }

/* ---------- reveal ---------- */
.js [data-reveal] { opacity: 0; transform: translateY(14px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.js [data-reveal].in { opacity: 1; transform: none; }
.js .cards .card:nth-child(3n + 2) { transition-delay: 70ms; }
.js .cards .card:nth-child(3n + 3) { transition-delay: 140ms; }

/* ---------- responsive ---------- */
@media (max-width: 1040px) {
  .harnesses { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}
@media (max-width: 960px) {
  .ho-grid, .start-grid { grid-template-columns: minmax(0, 1fr); }
  .cards { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .js .cards .card:nth-child(n) { transition-delay: 0ms; }
  .js .cards .card:nth-child(2n) { transition-delay: 70ms; }
}
@media (max-width: 820px) {
  .nav { display: none; }
}
@media (max-width: 640px) {
  .lang-cur { display: none; }
  .top-in { gap: 12px; }
  .lede { font-size: 16px; }
  .cta .btn { flex: 1 1 100%; }
  .video { border-radius: 14px; }
  .video-play { width: 52px; height: 52px; margin: -26px 0 0 -26px; }
  .harnesses { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
  .harness, .harness-more a { height: 112px; gap: 12px; }
  .cards { grid-template-columns: minmax(0, 1fr); gap: 12px; }
  .js .cards .card:nth-child(n) { transition-delay: 0ms; }
  .step { padding: 13px 12px 15px; gap: 12px; }
  .demo-ctl { padding-left: 0; }
  .caption { flex-basis: 100%; margin: 4px 0 0; }
  .log { height: 452px; padding: 6px 12px 14px; }
  .win-bar { padding: 0 12px; gap: 10px; }
  .dots { display: none; }
  .row-agent .it-in { padding-left: 0; }
  .who { margin-left: 0; }
  .dl { grid-template-columns: 22px 14px minmax(0, 1fr); font-size: 11.5px; }
  .foot-in { grid-template-columns: minmax(0, 1fr); }
  .foot-links { grid-template-columns: repeat(2, auto); justify-content: start; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0.01ms !important; transition-delay: 0ms !important; animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; }
  .js [data-reveal] { opacity: 1; transform: none; }
  .tool .i-run { animation: none; }
  .step-bar { display: none; }
  [data-demo="toggle"] { display: none; }
}

/* Mirrored from web/src/styles.css (bot avatars + brand mark) so the site renders the app's own SVGs identically. */
/* ================= bot avatars ================= */
.bot-avatar { display: block; overflow: visible; --fill: var(--c); }
.bot-avatar .ba-body > * { fill: var(--fill); stroke: var(--fill); }
.bot-avatar .ba-body > *:not(.ba-stroke) { stroke-width: 0; }
.bot-avatar .ba-body > .ba-cutout { fill: #fff; stroke: none; }
.bot-avatar .ba-body > .ba-detail { fill: none; stroke: #fff; stroke-width: 4; }
.bot-avatar .ba-eyes line { stroke: #fff; stroke-width: 7.5; stroke-linecap: round; }
@media (prefers-color-scheme: dark) {
  .bot-avatar { --fill: color-mix(in srgb, var(--c) 86%, #ffffff); }
}
/* ---------- bot avatar expressions & motion (transform/opacity only) ---------- */
.bot-avatar .ba-face line, .bot-avatar .ba-face path { stroke: #fff; stroke-width: 7.5; stroke-linecap: round; fill: none; }
.bot-avatar .ba-face .ba-dot { fill: #fff; stroke: none; }
.bot-avatar[data-shape="panda"] .ba-eyes line, .bot-avatar[data-shape="panda"] .ba-eyes path { stroke-width: 6; }
.bot-avatar[data-shape="panda"] .ba-mouth { stroke: var(--fill); }
.bot-avatar[data-shape="panda"] .ba-dot.ba-mouth { fill: var(--fill); stroke: none; }
.bot-avatar .ba-eyes line { stroke: #fff; }
.bot-avatar .ba-root, .bot-avatar .ba-eyes, .bot-avatar .ba-look, .bot-avatar .ba-mouth, .bot-avatar .ba-body { transform-box: fill-box; transform-origin: 50% 50%; }
.bot-avatar .ba-root { transform-origin: 50% 100%; }
.bot-avatar[data-anim] .ba-eyes { animation: ba-blink 5.2s var(--blink-delay, 0s) infinite; }
.bot-avatar[data-anim="full"] .ba-body { animation: ba-breathe 3.6s ease-in-out infinite; }
.bot-avatar[data-anim="full"][data-expr="idle"] .ba-look { animation: ba-glance 9s calc(var(--blink-delay, 0s) * 2) ease-in-out infinite; }
.bot-avatar[data-anim="full"][data-expr="thinking"] .ba-root { animation: ba-wobble 1.4s ease-in-out infinite; }
.bot-avatar[data-anim="full"][data-expr="thinking"] .ba-look { animation: ba-ponder 2.4s ease-in-out infinite; }
.bot-avatar[data-anim="full"][data-expr="speaking"] .ba-talk { animation: ba-talk 0.28s ease-in-out infinite alternate; }
.bot-avatar[data-anim="full"][data-expr="speaking"] .ba-body { animation: ba-pulse 0.56s ease-in-out infinite alternate; }
.bot-avatar[data-anim="full"][data-expr="sad"] .ba-root { animation: ba-shake 0.42s ease-in-out 1; }
.bot-avatar[data-anim="full"][data-expr="happy"] .ba-root { animation: ba-hop 0.5s var(--ease) 1; }
.bot-avatar[data-anim="full"] .ba-root[data-hop] { animation: ba-hop 0.5s var(--ease) 1; }
.bot-avatar[data-anim="full"][data-expr="sleepy"] .ba-body { animation: ba-breathe 6s ease-in-out infinite; }
.bot-avatar[data-expr="sleepy"] .ba-eyes, .bot-avatar[data-expr="happy"] .ba-eyes { animation: none !important; }
.bot-avatar[data-offscreen="true"] *, html[data-tab-hidden] .bot-avatar * { animation-play-state: paused !important; }
@keyframes ba-blink { 0%, 93%, 100% { transform: scaleY(1); } 95.5% { transform: scaleY(0.1); } }
@keyframes ba-breathe { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.025, 0.985); } }
@keyframes ba-glance { 0%, 40%, 100% { transform: translateX(0); } 46%, 58% { transform: translateX(4px); } 64%, 74% { transform: translateX(-3px); } }
@keyframes ba-ponder { 0%, 100% { transform: translate(0, 0); } 50% { transform: translate(3px, -2px); } }
@keyframes ba-wobble { 0%, 100% { transform: rotate(-3deg); } 50% { transform: rotate(3deg); } }
@keyframes ba-talk { from { transform: scaleY(0.45); } to { transform: scaleY(1.15); } }
@keyframes ba-pulse { from { transform: scale(1); } to { transform: scale(1.03); } }
@keyframes ba-shake { 0%, 100% { transform: translateX(0); } 20% { transform: translateX(-5px); } 40% { transform: translateX(5px); } 60% { transform: translateX(-3px); } 80% { transform: translateX(2px); } }
@keyframes ba-hop { 0% { transform: scale(1, 1); } 25% { transform: scale(1.12, 0.86); } 55% { transform: translateY(-10%) scale(0.92, 1.1); } 80% { transform: translateY(0) scale(1.04, 0.96); } 100% { transform: scale(1, 1); } }
@media (prefers-reduced-motion: reduce) { .bot-avatar * { animation: none !important; } }
/* Avatar states: thinking glances side to side, working looks down and bobs, done hops once */
.bot-avatar[data-anim="full"][data-expr="thinking"] .ba-root { animation: none; }
.bot-avatar[data-anim="full"][data-expr="thinking"] .ba-look { animation: ba-glance-lr 2.6s ease-in-out infinite; }
.bot-avatar[data-anim="full"][data-expr="working"] .ba-root { animation: ba-bob 1.3s ease-in-out infinite; }
.bot-avatar[data-anim="full"][data-expr="working"] .ba-eyes { animation: none; }
@keyframes ba-glance-lr { 0%, 100% { transform: translateX(0); } 25% { transform: translateX(-4px); } 60% { transform: translateX(4px); } }
@keyframes ba-bob { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-3%); } }
.brand-mark { display: block; overflow: visible; transform-origin: 46% 54%; transition: transform 180ms cubic-bezier(0.2, 0.8, 0.2, 1); }
.brand-mark .bm-ink { fill: var(--ink); }
.brand-mark .bm-red { fill: var(--brand); }
.brand-mark .bm-eyes { stroke: var(--on-ink); stroke-width: 9; stroke-linecap: round; transform-box: fill-box; transform-origin: center; transition: transform 220ms cubic-bezier(0.2, 0.8, 0.2, 1); animation: bm-blink 6.2s infinite; }
.brand-mark .bm-eyes-red { stroke: #fff; animation-delay: 0.2s; }
.brand:hover .brand-mark,
.brand:focus-visible .brand-mark { transform: scale(1.06); }
.brand:hover .bm-eyes-ink,
.brand:focus-visible .bm-eyes-ink { transform: translate(2.5px, -1px); }
.brand:hover .bm-eyes-red,
.brand:focus-visible .bm-eyes-red { transform: translate(-3px, 1px); }
html[data-tab-hidden] .brand-mark .bm-eyes { animation-play-state: paused; }
@keyframes bm-blink { 0%, 92%, 100% { scale: 1 1; } 95% { scale: 1 0.12; } }
@media (prefers-reduced-motion: reduce) {
  .brand-mark, .brand-mark .bm-eyes { animation: none; transition: none; }
  .brand:hover .brand-mark,
  .brand:focus-visible .brand-mark { transform: none; }
}