/* Brand palette from logo:
     navy:    #1B2D4E   teal:  #2A8A8A
     orange:  #E8833A   steel: #1F4050
  */
  :root[data-theme="dark"] {
    --bg:         #0E1A2B;
    --bg-raise:   #14263E;
    --bg-card:    #1A3150;
    --ink:        #EAF1F8;
    --ink-dim:    #9FB4CA;
    --ink-faint:  #607890;
    --rule:       #2A4263;
    --rule-soft:  #1F3350;
    --accent:     #2A8A8A;
    --accent-strong: #3FB0B0;
    --accent-ink: #0B1D1D;
    --warm:       #E8833A;
    --navy:       #1B2D4E;
    --surface:    var(--bg-raise);
  }
  :root[data-theme="light"] {
    --bg:         #F2F5F8;
    --bg-raise:   #FFFFFF;
    --bg-card:    #F8FAFC;
    --ink:        #0F1F36;
    --ink-dim:    #415068;
    --ink-faint:  #8795A8;
    --rule:       #D5DCE4;
    --rule-soft:  #E5EAF0;
    --accent:     #1F6F6F;
    --accent-strong: #2A8A8A;
    --accent-ink: #FFFFFF;
    --warm:       #D66F23;
    --navy:       #1B2D4E;
    --surface:    var(--bg-raise);
  }
  :root[data-theme="light"][data-lighttheme="porcelain"] {
    --bg: #F2F5F8; --bg-raise: #FFFFFF; --bg-card: #F8FAFC;
    --rule: #D5DCE4; --rule-soft: #E5EAF0;
  }
  :root[data-theme="light"][data-lighttheme="mist"] {
    --bg: #E9EEF3; --bg-raise: #FFFFFF; --bg-card: #F2F6FA;
    --rule: #C8D2DD; --rule-soft: #DCE4EC;
  }
  :root[data-theme="light"][data-lighttheme="sage"] {
    --bg: #EDF2EF; --bg-raise: #FFFFFF; --bg-card: #F5F8F6;
    --rule: #CAD5CE; --rule-soft: #DEE6E0;
  }
  :root[data-theme="light"][data-lighttheme="slate"] {
    --bg: #E8ECEF; --bg-raise: #FDFDFD; --bg-card: #F1F4F6;
    --rule: #C7CED4; --rule-soft: #DCE1E5;
  }
  :root[data-theme="light"][data-lighttheme="ice"] {
    --bg: #F4F7FB; --bg-raise: #FFFFFF; --bg-card: #FBFCFE;
    --rule: #D8DFE8; --rule-soft: #E8EDF3;
  }
  :root[data-theme="light"][data-lighttheme="paper"] {
    --bg: #F5F2EC; --bg-raise: #FFFFFF; --bg-card: #FBFAF5;
    --rule: #D9D4C7; --rule-soft: #E8E4D8;
  }
  * { box-sizing: border-box; }
  html, body { margin: 0; padding: 0; background: var(--bg); color: var(--ink); }
  body {
    font-family: 'IBM Plex Sans', system-ui, sans-serif;
    font-size: 16px;
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
    font-feature-settings: "ss01", "ss02";
    transition: background .2s, color .2s;
  }
  body[data-lang="zh"] { --zh-sans: 'Noto Sans SC'; --zh-display: 'Noto Serif SC'; --zh-display-weight: 500; }
  body[data-lang="zh"][data-zhfont="editorial"]    { --zh-sans: 'Noto Sans SC'; --zh-display: 'Noto Serif SC'; --zh-display-weight: 500; }
  body[data-lang="zh"][data-zhfont="modern"]       { --zh-sans: 'Noto Sans SC'; --zh-display: 'Noto Sans SC'; --zh-display-weight: 700; }
  body[data-lang="zh"][data-zhfont="literary"]     { --zh-sans: 'LXGW WenKai TC'; --zh-display: 'LXGW WenKai TC'; --zh-display-weight: 400; }
  body[data-lang="zh"][data-zhfont="contemporary"] { --zh-sans: 'Noto Sans SC'; --zh-display: 'ZCOOL XiaoWei'; --zh-display-weight: 400; }
  body[data-lang="zh"][data-zhfont="mono-serif"]   { --zh-sans: 'Noto Serif SC'; --zh-display: 'Noto Serif SC'; --zh-display-weight: 600; }
  body[data-lang="zh"][data-zhfont="system"]       { --zh-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei"; --zh-display: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei"; --zh-display-weight: 600; }

  body[data-lang="zh"] { font-family: var(--zh-sans), 'IBM Plex Sans', system-ui, sans-serif; }
  body[data-lang="zh"] .serif,
  body[data-lang="zh"] .h1,
  body[data-lang="zh"] .sec-title,
  body[data-lang="zh"] .vision h2,
  body[data-lang="zh"] .founder-name,
  body[data-lang="zh"] .mod-title,
  body[data-lang="zh"] .prob h3,
  body[data-lang="zh"] .deep h3 { font-family: var(--zh-display), 'Instrument Serif', serif; font-weight: var(--zh-display-weight); letter-spacing: 0; }
  .mono { font-family: 'IBM Plex Mono', ui-monospace, monospace; }
  .serif { font-family: 'Instrument Serif', serif; font-weight: 400; letter-spacing: -0.01em; }
  .accent { color: var(--accent); }
  .warm { color: var(--warm); }
  a { color: inherit; text-decoration: none; }
  button { font-family: inherit; cursor: pointer; border: 0; background: none; color: inherit; }

  .container { max-width: 1360px; margin: 0 auto; padding: 0 40px; }
  @media (max-width: 720px) { .container { padding: 0 20px; } }

  /* Nav */
  .nav {
    position: sticky; top: 0; z-index: 50;
    backdrop-filter: blur(14px);
    background: color-mix(in oklab, var(--bg) 80%, transparent);
    border-bottom: 1px solid var(--rule-soft);
  }
  .nav-inner { display: flex; align-items: center; justify-content: space-between; height: 68px; gap: 24px; }
  .brand { display: flex; align-items: center; gap: 10px; font-family: 'IBM Plex Mono'; font-weight: 600; font-size: 15px; letter-spacing: -0.01em; }
  .brand img { width: 26px; height: 26px; display: block; }
  .nav-links { display: flex; gap: 26px; font-family: 'IBM Plex Mono'; font-size: 12.5px; color: var(--ink-dim); }
  .nav-links a:hover { color: var(--accent-strong); }
  .nav-controls { display: flex; align-items: center; gap: 10px; }

  .seg { display: inline-flex; border: 1px solid var(--rule); border-radius: 2px; overflow: hidden; font-family: 'IBM Plex Mono'; font-size: 11.5px; }
  .seg button { padding: 7px 10px; color: var(--ink-dim); background: transparent; }
  .seg button.on { background: var(--ink); color: var(--bg); }
  .seg button:not(.on):hover { color: var(--ink); }

  .icon-btn { width: 34px; height: 34px; border: 1px solid var(--rule); border-radius: 2px; display: inline-flex; align-items: center; justify-content: center; color: var(--ink-dim); }
  .icon-btn:hover { color: var(--accent-strong); border-color: var(--accent); }

  .nav-cta { font-family: 'IBM Plex Mono'; font-size: 12.5px; padding: 8px 14px; border: 1px solid var(--rule); border-radius: 2px; display: inline-flex; align-items: center; gap: 8px; }
  .nav-cta:hover { border-color: var(--accent); color: var(--accent-strong); }

  @media (max-width: 980px) { .nav-links { display: none; } }
  @media (max-width: 640px) { .nav-cta { display: none; } }

  /* Ticker */
  .ticker { border-bottom: 1px solid var(--rule-soft); font-family: 'IBM Plex Mono'; font-size: 11.5px; color: var(--ink-faint); padding: 10px 0; overflow: hidden; white-space: nowrap; }
  .ticker-track { display: inline-block; padding-left: 100%; animation: tick 60s linear infinite; }
  .ticker-track span { margin: 0 34px; }
  .ticker-track .tok { color: var(--accent-strong); }
  .ticker-track .tok-w { color: var(--warm); }
  @keyframes tick { from { transform: translateX(0); } to { transform: translateX(-100%); } }

  /* Hero */
  .hero { position: relative; padding: 100px 0 60px; overflow: hidden; }
  .hero-grid {
    position: absolute; inset: 0;
    background-image:
      linear-gradient(to right, var(--rule-soft) 1px, transparent 1px),
      linear-gradient(to bottom, var(--rule-soft) 1px, transparent 1px);
    background-size: 80px 80px;
    mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, black 40%, transparent 85%);
    opacity: 0.55;
    pointer-events: none;
  }
  .hero-inner { position: relative; display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 64px; align-items: end; }
  @media (max-width: 960px) { .hero-inner { grid-template-columns: 1fr; gap: 40px; } }

  .eyebrow { display: inline-flex; align-items: center; gap: 10px; font-family: 'IBM Plex Mono'; font-size: 11.5px; color: var(--ink-dim); padding: 6px 10px; border: 1px solid var(--rule); border-radius: 2px; background: var(--bg-raise); }
  .eyebrow .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent-strong); box-shadow: 0 0 0 3px color-mix(in oklab, var(--accent) 25%, transparent); }

  .h1 { font-family: 'Instrument Serif'; font-weight: 400; font-size: clamp(48px, 7vw, 108px); line-height: 0.96; letter-spacing: -0.025em; margin: 24px 0 0; color: var(--ink); }
  .h1 em { font-style: italic; color: var(--accent-strong); }
  .h1 .thin { color: var(--ink-dim); font-style: italic; }
  body[data-lang="zh"] .h1 { font-size: clamp(44px, 6.2vw, 92px); line-height: 1.05; }

  .lede { margin-top: 28px; font-size: 19px; line-height: 1.55; color: var(--ink-dim); max-width: 58ch; }

  .hero-cta-row { display: flex; gap: 14px; margin-top: 36px; flex-wrap: wrap; }
  .btn { font-family: 'IBM Plex Mono'; font-size: 13px; padding: 12px 18px; border-radius: 2px; display: inline-flex; align-items: center; gap: 10px; transition: .15s; }
  .btn-primary { background: var(--accent); color: var(--accent-ink); font-weight: 600; }
  .btn-primary:hover { background: var(--accent-strong); }
  .btn-ghost { border: 1px solid var(--rule); color: var(--ink); }
  .btn-ghost:hover { border-color: var(--accent); color: var(--accent-strong); }

  .hero-stats { margin-top: 64px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; border-top: 1px solid var(--rule-soft); border-bottom: 1px solid var(--rule-soft); background: var(--rule-soft); }
  .hero-stat { background: var(--bg); padding: 22px 18px; }
  .hero-stat .cap { font-family: 'IBM Plex Mono'; font-size: 11px; color: var(--ink-faint); text-transform: uppercase; letter-spacing: 0.08em; }
  .hero-stat .v { font-family: 'Instrument Serif'; font-size: 42px; line-height: 1; margin-top: 10px; letter-spacing: -0.02em; color: var(--accent-strong); }
  .hero-stat .v.warm-v { color: var(--warm); }
  .hero-stat .l { color: var(--ink-dim); font-size: 13.5px; margin-top: 6px; }
  body[data-lang="zh"] .hero-stat .v { font-family: var(--zh-display), serif; font-size: 38px; }

  .hero-card { border: 1px solid var(--rule); background: linear-gradient(180deg, var(--bg-raise) 0%, var(--bg) 100%); padding: 22px; position: relative; }
  .hero-card-label { font-family: 'IBM Plex Mono'; font-size: 11px; color: var(--ink-faint); display: flex; justify-content: space-between; align-items: center; margin-bottom: 14px; }
  .hero-card-label .live { display: inline-flex; align-items: center; gap: 6px; color: var(--accent-strong); }
  .hero-card-label .live::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: var(--accent-strong); animation: pulse 1.4s infinite; }
  @keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.35; } }

  /* Sections */
  section { border-bottom: 1px solid var(--rule-soft); padding: 96px 0; position: relative; }
  @media (max-width: 720px) { section { padding: 72px 0; } }
  .sec-label { font-family: 'IBM Plex Mono'; font-size: 11.5px; color: var(--ink-faint); letter-spacing: 0.08em; text-transform: uppercase; display: flex; align-items: center; gap: 10px; margin-bottom: 18px; }
  .sec-label::before { content: ''; width: 22px; height: 1px; background: var(--accent); }
  .sec-title { font-family: 'Instrument Serif'; font-weight: 400; font-size: clamp(36px, 4.8vw, 64px); line-height: 1.02; letter-spacing: -0.02em; margin: 0 0 18px; max-width: 22ch; }
  .sec-title em { color: var(--accent-strong); font-style: italic; }
  .sec-title em.warm-em { color: var(--warm); }
  .sec-sub { color: var(--ink-dim); font-size: 17px; line-height: 1.5; max-width: 64ch; }
  .sec-head-split { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 64px; align-items: end; margin-bottom: 48px; }
  .sec-head-split .sec-title { margin: 0; }
  .sec-head-split .sec-sub { margin: 0; max-width: 46ch; padding-bottom: 6px; }
  @media (max-width: 900px) { .sec-head-split { grid-template-columns: 1fr; gap: 24px; margin-bottom: 36px; } }

  /* Modalities (Question section) */
  .modalities { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--rule-soft); margin-top: 56px; border: 1px solid var(--rule-soft); }
  @media (max-width: 820px) { .modalities { grid-template-columns: 1fr; } }
  .mod { background: var(--bg); padding: 28px 24px 26px; min-height: 280px; display: flex; flex-direction: column; justify-content: space-between; position: relative; }
  .mod-ix { font-family: 'IBM Plex Mono'; font-size: 11px; color: var(--ink-faint); }
  .mod-title { font-family: 'Instrument Serif'; font-size: 30px; line-height: 1.08; margin: 14px 0 10px; letter-spacing: -0.01em; }
  .mod-arrow { color: var(--accent-strong); }
  .mod-body { color: var(--ink-dim); font-size: 14.5px; line-height: 1.55; }
  .mod-viz { height: 64px; margin-top: 16px; border-top: 1px dashed var(--rule-soft); padding-top: 16px; }
  .mod.active { background: color-mix(in oklab, var(--accent) 7%, var(--bg)); }
  .mod.active .mod-ix { color: var(--accent-strong); }

  /* Opportunity */
  .opp-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: start; }
  @media (max-width: 900px) { .opp-grid { grid-template-columns: 1fr; gap: 40px; } }
  .stat-stack { display: grid; gap: 20px; margin-top: 24px; }
  .stat { border: 1px solid var(--rule); padding: 22px 24px; display: grid; grid-template-columns: 1fr auto; align-items: end; gap: 18px; background: var(--bg-raise); }
  .stat-num { font-family: 'Instrument Serif'; font-size: 56px; line-height: 1; letter-spacing: -0.02em; color: var(--accent-strong); }
  .stat-num.warm-n { color: var(--warm); }
  .stat-cap { font-family: 'IBM Plex Mono'; font-size: 11px; color: var(--ink-faint); text-transform: uppercase; letter-spacing: 0.06em; }
  .stat-desc { color: var(--ink-dim); font-size: 14px; max-width: 34ch; }
  .quote-block { border-left: 2px solid var(--accent); padding: 4px 0 4px 26px; }
  .quote-block p { font-family: 'Instrument Serif'; font-style: italic; font-size: 24px; line-height: 1.38; margin: 0 0 22px; color: var(--ink); }
  body[data-lang="zh"] .quote-block p { font-family: var(--zh-display), serif; font-style: normal; }
  .quote-attr { font-family: 'IBM Plex Mono'; font-size: 12px; color: var(--ink-dim); }
  .quote-attr strong { color: var(--ink); font-weight: 500; }

  /* Problem */
  .problem-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--rule-soft); border: 1px solid var(--rule-soft); margin-top: 48px; }
  @media (max-width: 820px) { .problem-grid { grid-template-columns: 1fr; } }
  .prob { padding: 36px 32px; background: var(--bg); min-height: 260px; display: flex; flex-direction: column; justify-content: space-between; }
  .prob h3 { font-family: 'Instrument Serif'; font-size: 32px; line-height: 1.08; margin: 12px 0 14px; letter-spacing: -0.01em; max-width: 18ch; }
  .prob p { color: var(--ink-dim); font-size: 15px; line-height: 1.55; max-width: 42ch; }
  .prob-ix { font-family: 'IBM Plex Mono'; font-size: 11px; color: var(--warm); letter-spacing: 0.06em; text-transform: uppercase; }

  /* Gap */
  .failures { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 48px; }
  @media (max-width: 820px) { .failures { grid-template-columns: 1fr; } }
  .fail { border: 1px solid var(--rule); padding: 28px; background: var(--bg-raise); }
  .fail-head { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
  .fail-head .badge { font-family: 'IBM Plex Mono'; font-size: 11px; padding: 3px 8px; border: 1px solid var(--rule); color: var(--ink-faint); border-radius: 2px; }
  .fail-head .fail-sub { font-family: 'Fraunces'; font-style: italic; font-size: 19px; color: var(--ink); letter-spacing: -0.005em; line-height: 1.15; }
  body[data-lang="zh"] .fail-head .fail-sub { font-family: var(--zh-display), serif; font-style: normal; font-weight: 500; font-size: 18px; }
  .fail h3 { font-family: 'IBM Plex Sans'; font-weight: 600; font-size: 19px; margin: 0 0 10px; letter-spacing: -0.01em; }
  body[data-lang="zh"] .fail h3 { font-family: var(--zh-sans), sans-serif; }
  .fail p { color: var(--ink-dim); font-size: 14.5px; line-height: 1.55; margin: 0; }
  .fail-meter { margin-top: 20px; display: grid; grid-template-columns: 90px 1fr 44px; gap: 8px 14px; align-items: center; font-family: 'IBM Plex Mono'; font-size: 11px; color: var(--ink-faint); }
  .meter { height: 6px; background: var(--rule-soft); position: relative; overflow: hidden; }
  .meter span { position: absolute; inset: 0 auto 0 0; background: var(--warm); }
  .meter span.ok { background: var(--accent-strong); }

  /* Solution */
  .solution-wrap { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 64px; align-items: center; }
  @media (max-width: 960px) { .solution-wrap { grid-template-columns: 1fr; gap: 40px; } }
  .engine-card { border: 1px solid var(--rule); background: var(--bg-raise); padding: 24px; position: relative; aspect-ratio: 1 / 1; max-width: 560px; width: 100%; margin-left: auto; }
  .pillars { display: grid; gap: 14px; margin-top: 32px; }
  .pill { display: grid; grid-template-columns: auto 1fr; gap: 18px; align-items: start; padding: 16px 0; border-top: 1px solid var(--rule-soft); }
  .pill-num { font-family: 'IBM Plex Mono'; font-size: 12px; color: var(--accent-strong); padding-top: 2px; }
  .pill h4 { margin: 0 0 4px; font-family: 'IBM Plex Sans'; font-weight: 600; font-size: 16px; letter-spacing: -0.005em; }
  body[data-lang="zh"] .pill h4 { font-family: var(--zh-sans), sans-serif; }
  .pill p { margin: 0; color: var(--ink-dim); font-size: 14.5px; line-height: 1.55; }

  /* Platform */
  .plat-header { display: flex; align-items: end; justify-content: space-between; gap: 40px; flex-wrap: wrap; margin-bottom: 40px; }
  .plat { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
  @media (max-width: 960px) { .plat { grid-template-columns: repeat(2, 1fr); } }
  @media (max-width: 520px) { .plat { grid-template-columns: 1fr; } }
  .plat-cell { border: 1px solid var(--rule); background: var(--bg-raise); padding: 22px; min-height: 220px; display: flex; flex-direction: column; justify-content: space-between; position: relative; transition: border-color .2s; }
  .plat-cell:hover { border-color: var(--accent); }
  .plat-cell .cell-ix { font-family: 'IBM Plex Mono'; font-size: 11px; color: var(--ink-faint); }
  .plat-cell h4 { margin: 0; font-family: 'Instrument Serif'; font-size: 24px; line-height: 1.1; letter-spacing: -0.01em; }
  body[data-lang="zh"] .plat-cell h4 { font-family: var(--zh-display), serif; }
  .plat-cell .cell-type { font-family: 'IBM Plex Mono'; font-size: 11px; color: var(--accent-strong); text-transform: uppercase; letter-spacing: 0.04em; margin-top: 6px; }

  .modes-block { margin-top: 56px; }
  .modes-head { font-family: 'IBM Plex Mono'; font-size: 11px; color: var(--ink-faint); letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 20px; }
  .modes-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
  @media (max-width: 900px) { .modes-grid { grid-template-columns: 1fr; } }
  .mode-card { border: 1px solid var(--rule); padding: 28px; background: var(--surface); display: flex; flex-direction: column; gap: 18px; position: relative; overflow: hidden; }
  .mode-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: var(--accent-strong); opacity: 0.85; }
  .mode-tag { display: inline-flex; align-items: center; gap: 8px; font-family: 'IBM Plex Mono'; font-size: 10.5px; letter-spacing: 0.12em; padding: 5px 10px 4px; border: 1px solid var(--accent-strong); color: var(--accent-strong); align-self: flex-start; text-transform: uppercase; }
  .mode-title { font-family: 'Fraunces'; font-size: 26px; font-weight: 400; margin: 0; line-height: 1.15; letter-spacing: -0.01em; }
  body[data-lang="zh"] .mode-title { font-family: var(--zh-display), serif; font-weight: 500; }
  .mode-desc { font-size: 13.5px; line-height: 1.55; color: var(--ink-dim); margin: 0; max-width: 52ch; }

  .mode-flow { display: grid; grid-template-columns: 1fr auto 1.3fr auto 1fr; gap: 12px; align-items: center; margin-top: 8px; }
  .mode-node { border: 1px solid var(--rule); padding: 18px 10px 14px; text-align: center; background: var(--bg); display: flex; flex-direction: column; align-items: center; gap: 8px; min-height: 96px; justify-content: center; position: relative; }
  .mode-node.engine { background: var(--ink); color: var(--bg); border-color: var(--ink); padding: 20px 12px; }
  .mode-node svg { display: block; }
  .mode-node .node-label { font-family: 'IBM Plex Mono'; font-size: 10.5px; letter-spacing: 0.04em; line-height: 1.25; color: var(--ink-dim); text-transform: uppercase; }
  .mode-node.engine .node-label { color: var(--bg); opacity: 0.7; font-size: 9.5px; }
  .mode-node .node-title { font-family: 'Fraunces'; font-style: italic; font-size: 15px; color: var(--ink); letter-spacing: -0.005em; line-height: 1.2; }
  body[data-lang="zh"] .mode-node .node-title { font-family: var(--zh-display), serif; font-style: normal; font-weight: 500; }
  .mode-node.engine .node-title { color: var(--bg); font-family: 'IBM Plex Sans'; font-style: normal; font-weight: 500; font-size: 13.5px; letter-spacing: -0.005em; }
  body[data-lang="zh"] .mode-node.engine .node-title { font-family: var(--zh-sans), sans-serif; }

  .mode-arrow { display: flex; flex-direction: column; align-items: center; gap: 4px; color: var(--accent-strong); position: relative; }
  .mode-arrow svg { display: block; }
  .mode-arrow-label { font-family: 'IBM Plex Mono'; font-size: 9px; letter-spacing: 0.08em; color: var(--accent-strong); text-transform: uppercase; white-space: nowrap; position: absolute; top: -16px; }

  .mode-amplify { display: flex; align-items: center; justify-content: space-between; padding: 10px 14px; border: 1px dashed var(--accent-strong); background: color-mix(in oklch, var(--accent-strong) 6%, transparent); margin-top: 4px; }
  .mode-amplify .amp-label { font-family: 'IBM Plex Mono'; font-size: 10.5px; letter-spacing: 0.08em; color: var(--accent-strong); text-transform: uppercase; }
  .mode-amplify .amp-value { font-family: 'Fraunces'; font-size: 18px; color: var(--accent-strong); letter-spacing: -0.01em; }
  body[data-lang="zh"] .mode-amplify .amp-value { font-family: var(--zh-display), serif; font-weight: 500; }

  .ifaces-block { margin-top: 48px; padding-top: 40px; border-top: 1px solid var(--rule-soft); }
  .ifaces-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 20px; }
  @media (max-width: 900px) { .ifaces-grid { grid-template-columns: 1fr; } }
  .iface-cell { border: 1px solid var(--rule); background: var(--surface); padding: 0; display: flex; flex-direction: column; position: relative; overflow: hidden; transition: border-color 0.2s; }
  .iface-cell:hover { border-color: var(--accent-strong); }
  .iface-preview { height: 140px; background: var(--bg-raise); border-bottom: 1px solid var(--rule); padding: 14px; display: flex; align-items: flex-start; justify-content: flex-start; position: relative; overflow: hidden; }
  .iface-body { padding: 18px 20px 22px; display: flex; flex-direction: column; gap: 8px; }
  .iface-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
  .iface-ix { font-family: 'IBM Plex Mono'; font-size: 10.5px; color: var(--accent-strong); letter-spacing: 0.08em; }
  .iface-chip { font-family: 'IBM Plex Mono'; font-size: 9.5px; color: var(--ink-faint); letter-spacing: 0.08em; padding: 2px 7px; border: 1px solid var(--rule); text-transform: uppercase; }
  .iface-title { font-family: 'IBM Plex Sans'; font-weight: 600; font-size: 18px; margin: 6px 0 4px; letter-spacing: -0.01em; color: var(--ink); }
  body[data-lang="zh"] .iface-title { font-family: var(--zh-sans), sans-serif; }
  .iface-desc { font-size: 13.5px; line-height: 1.5; color: var(--ink-dim); margin: 0; }

  .web-preview { width: 100%; height: 100%; background: var(--bg); border: 1px solid var(--rule); display: flex; flex-direction: column; font-family: 'IBM Plex Mono'; font-size: 9px; color: var(--ink-dim); }
  .web-preview .web-top { display: flex; align-items: center; gap: 5px; padding: 5px 8px; border-bottom: 1px solid var(--rule-soft); }
  .web-preview .web-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--rule); }
  .web-preview .web-body { display: grid; grid-template-columns: 58px 1fr; flex: 1; }
  .web-preview .web-side { border-right: 1px solid var(--rule-soft); padding: 6px 5px; display: flex; flex-direction: column; gap: 4px; font-size: 8px; }
  .web-preview .web-side .row { height: 5px; background: var(--rule-soft); border-radius: 1px; }
  .web-preview .web-side .row.sel { background: var(--accent-strong); opacity: 0.6; }
  .web-preview .web-main { padding: 6px 8px; display: flex; flex-direction: column; gap: 4px; }
  .web-preview .web-chart { flex: 1; display: flex; align-items: flex-end; gap: 2px; }
  .web-preview .web-chart span { flex: 1; background: var(--accent-strong); opacity: 0.7; }

  .tui-preview { width: 100%; height: 100%; background: #0a0d11; color: #d8dde3; border: 1px solid #1a1f26; padding: 8px 10px; font-family: 'IBM Plex Mono'; font-size: 9.5px; line-height: 1.5; overflow: hidden; }
  .tui-preview .tui-line { white-space: nowrap; }
  .tui-preview .tui-prompt { color: #7cb8a4; }
  .tui-preview .tui-accent { color: #e8a97a; }
  .tui-preview .tui-dim { color: #5a6472; }
  .tui-preview .tui-cursor { display: inline-block; width: 5px; height: 9px; background: #7cb8a4; margin-left: 2px; vertical-align: text-top; animation: tuiBlink 1s steps(2) infinite; }
  @keyframes tuiBlink { 50% { opacity: 0; } }

  .sdk-preview { width: 100%; height: 100%; background: var(--bg); border: 1px solid var(--rule); padding: 10px 12px; font-family: 'IBM Plex Mono'; font-size: 10px; line-height: 1.55; color: var(--ink-dim); overflow: hidden; }
  .sdk-preview .kw { color: var(--accent-strong); }
  .sdk-preview .str { color: var(--warm); }
  .sdk-preview .cm { color: var(--ink-faint); font-style: italic; }

  .engine-bar { margin-top: 28px; border: 1px solid var(--rule); padding: 16px 20px; font-family: 'IBM Plex Mono'; font-size: 12.5px; color: var(--ink-dim); display: flex; justify-content: space-between; align-items: center; background: color-mix(in oklab, var(--accent) 6%, var(--bg)); gap: 16px; flex-wrap: wrap; }
  .engine-bar strong { color: var(--accent-strong); font-weight: 500; }
  .infinite { color: var(--warm); font-weight: 600; font-size: 16px; }

  /* Values */
  .values { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--rule-soft); border: 1px solid var(--rule-soft); margin-top: 48px; }
  @media (max-width: 820px) { .values { grid-template-columns: 1fr; } }
  .val { background: var(--bg); padding: 32px 28px; min-height: 220px; display: flex; flex-direction: column; justify-content: space-between; }
  .val-num { font-family: 'IBM Plex Mono'; font-size: 11px; color: var(--accent-strong); }
  .val h3 { font-family: 'Instrument Serif'; font-size: 26px; line-height: 1.1; margin: 14px 0 10px; letter-spacing: -0.01em; max-width: 20ch; }
  .val p { color: var(--ink-dim); font-size: 14.5px; line-height: 1.55; margin: 0; }

  /* Verticals */
  .verts { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; margin-top: 40px; }
  @media (max-width: 960px) { .verts { grid-template-columns: repeat(2, 1fr); } }
  .vert { border: 1px solid var(--rule); padding: 20px 20px 24px; background: var(--bg); min-height: 160px; display: flex; flex-direction: column; justify-content: space-between; transition: .2s; }
  .vert:hover { background: var(--bg-raise); border-color: var(--accent); }
  .vert .vert-ix { font-family: 'IBM Plex Mono'; font-size: 11px; color: var(--ink-faint); }
  .vert h4 { margin: 0; font-family: 'IBM Plex Sans'; font-weight: 600; font-size: 17px; letter-spacing: -0.005em; }
  body[data-lang="zh"] .vert h4 { font-family: var(--zh-sans), sans-serif; }
  .vert p { margin: 0; font-family: 'IBM Plex Mono'; font-size: 11px; color: var(--ink-faint); text-transform: uppercase; letter-spacing: 0.05em; }

  /* Deep-dive */
  .deep-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--rule-soft); border: 1px solid var(--rule-soft); margin-top: 40px; }
  @media (max-width: 820px) { .deep-grid { grid-template-columns: 1fr; } }
  .deep { background: var(--bg); padding: 36px 32px; display: flex; flex-direction: column; }
  .deep-label { font-family: 'IBM Plex Mono'; font-size: 11px; color: var(--accent-strong); text-transform: uppercase; letter-spacing: 0.08em; }
  .deep h3 { font-family: 'Instrument Serif'; font-size: 30px; line-height: 1.1; margin: 12px 0 18px; letter-spacing: -0.01em; max-width: 20ch; }
  .deep ul { list-style: none; padding: 0; margin: 12px 0 0; display: grid; gap: 14px; }
  .deep li { display: grid; grid-template-columns: 140px 1fr; gap: 18px; padding-top: 12px; border-top: 1px solid var(--rule-soft); }
  .deep li strong { font-family: 'IBM Plex Sans'; font-weight: 600; font-size: 14.5px; color: var(--ink); }
  body[data-lang="zh"] .deep li strong { font-family: var(--zh-sans), sans-serif; }
  .deep li span { color: var(--ink-dim); font-size: 14px; line-height: 1.5; }

  /* GTM */
  .gtm { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; margin-top: 48px; }
  @media (max-width: 900px) { .gtm { grid-template-columns: 1fr; gap: 40px; } }
  .gtm h3 { font-family: 'IBM Plex Mono'; font-size: 12px; color: var(--ink-faint); text-transform: uppercase; letter-spacing: 0.08em; margin: 0 0 20px; }
  .buyer-list { display: grid; gap: 10px; }
  .buyer { border: 1px solid var(--rule); padding: 16px 18px; display: grid; grid-template-columns: auto auto 1fr auto; gap: 16px; align-items: center; background: var(--bg-raise); transition: border-color .2s; }
  .buyer:hover { border-color: var(--accent); }
  .buyer .buyer-ix { font-family: 'IBM Plex Mono'; font-size: 11px; color: var(--ink-faint); }
  .buyer .buyer-name { font-family: 'IBM Plex Sans'; font-weight: 500; font-size: 15px; }
  body[data-lang="zh"] .buyer .buyer-name { font-family: var(--zh-sans), sans-serif; }
  .buyer .buyer-tag { font-family: 'IBM Plex Mono'; font-size: 11px; color: var(--accent-strong); }
  .model-list { display: grid; gap: 12px; }
  .model { border: 1px solid var(--rule); padding: 22px; background: var(--bg-raise); }
  .model-head { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 6px; gap: 12px; }
  .model-head h4 { margin: 0; font-family: 'IBM Plex Sans'; font-weight: 600; font-size: 16px; }
  body[data-lang="zh"] .model-head h4 { font-family: var(--zh-sans), sans-serif; }
  .model-head span { font-family: 'IBM Plex Mono'; font-size: 11px; color: var(--ink-faint); }
  .model p { margin: 0; color: var(--ink-dim); font-size: 14px; line-height: 1.5; }

  /* Team */
  .team-body { margin-top: 48px; }
  .founders-row { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; align-items: stretch; }
  .founders-row:has(.founder-card:only-child) { grid-template-columns: 1fr; }
  .team-creds { margin-top: 40px; }
  @media (min-width: 821px) {
    .team-body:has(.founder-card:only-child) {
      display: grid;
      grid-template-columns: minmax(0, 460px) 1fr;
      column-gap: 56px;
      align-items: start;
    }
    .team-body:has(.founder-card:only-child) .team-creds { margin-top: 0; }
  }
  @media (max-width: 820px) { .founders-row { grid-template-columns: 1fr; gap: 20px; } }
  .founder-card { border: 1px solid var(--rule); padding: 28px; background: var(--bg-raise); display: flex; flex-direction: column; gap: 14px; }
  .founder-card .founder-bio { flex: 1; }
  .founder-head { display: flex; align-items: center; gap: 18px; margin-bottom: 18px; }
  .founder-portrait { width: 72px; height: 72px; border-radius: 50%; background: var(--bg-card); border: 1px solid var(--rule-soft); overflow: hidden; flex-shrink: 0; }
  .founder-portrait img { width: 100%; height: 100%; object-fit: cover; object-position: center 22%; display: block; filter: saturate(0.9) contrast(1.02); }
  .founder-head-text { display: flex; flex-direction: column; gap: 4px; }
  .founder-name { font-family: 'Instrument Serif'; font-size: 24px; line-height: 1.05; letter-spacing: -0.01em; }
  .founder-role { font-family: 'IBM Plex Mono'; font-size: 11.5px; color: var(--accent-strong); }
  .founder-bio { color: var(--ink-dim); font-size: 14px; line-height: 1.55; margin: 0; }
  .creds { display: grid; }
  .cred { padding: 20px 0; border-top: 1px solid var(--rule-soft); display: grid; grid-template-columns: 180px 1fr; gap: 24px; }
  .cred:last-child { border-bottom: 1px solid var(--rule-soft); }
  .cred strong { font-family: 'IBM Plex Mono'; font-size: 11px; color: var(--ink-faint); text-transform: uppercase; letter-spacing: 0.06em; font-weight: 500; }
  .cred p { margin: 0; font-family: 'IBM Plex Sans'; color: var(--ink); font-size: 15px; line-height: 1.5; }
  body[data-lang="zh"] .cred p { font-family: var(--zh-sans), sans-serif; }
  .cred p em { color: var(--ink-dim); font-style: normal; display: block; font-size: 13px; margin-top: 4px; font-family: 'IBM Plex Mono'; }
  .affs { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
  .aff { font-family: 'IBM Plex Mono'; font-size: 11px; padding: 6px 10px; border: 1px solid var(--rule); border-radius: 2px; color: var(--ink-dim); background: var(--bg); }

  /* Vision */
  .vision { padding: 140px 0 120px; border-bottom: 1px solid var(--rule-soft); position: relative; overflow: hidden; }
  .vision-grid { position: absolute; inset: 0; background-image: linear-gradient(to right, var(--rule-soft) 1px, transparent 1px); background-size: 40px 40px; mask-image: radial-gradient(ellipse 70% 80% at 50% 50%, black 20%, transparent 80%); opacity: 0.5; }
  .vision-inner { position: relative; text-align: center; }
  .vision h2 { font-family: 'Instrument Serif'; font-size: clamp(42px, 6vw, 92px); line-height: 1.02; letter-spacing: -0.025em; margin: 20px auto 36px; max-width: 20ch; }
  .vision h2 em { color: var(--accent-strong); font-style: italic; }
  .vision .vision-sub { color: var(--ink-dim); font-size: 18px; max-width: 50ch; margin: 0 auto 36px; }
  body[data-lang="zh"] .vision h2 { font-size: clamp(40px, 5.4vw, 80px); }

  /* Footer */
  footer { padding: 56px 0 40px; }
  .footer-inner { display: flex; justify-content: space-between; align-items: start; gap: 40px; flex-wrap: wrap; }
  .footer-brand { max-width: 360px; }
  .footer-brand p { color: var(--ink-dim); font-size: 13.5px; line-height: 1.55; margin: 14px 0 0; }
  .footer-cols { display: flex; gap: 56px; flex-wrap: wrap; }
  .footer-col { display: flex; flex-direction: column; gap: 8px; min-width: 120px; }
  .footer-col strong { font-family: 'IBM Plex Mono'; font-size: 11px; color: var(--ink-faint); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 6px; font-weight: 500; }
  .footer-col a { font-family: 'IBM Plex Mono'; font-size: 12.5px; color: var(--ink-dim); }
  .footer-col a:hover { color: var(--accent-strong); }
  .footer-legal { margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--rule-soft); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 16px; font-family: 'IBM Plex Mono'; font-size: 11px; color: var(--ink-faint); }

  /* Tweaks panel */
  .tweaks { position: fixed; bottom: 20px; right: 20px; z-index: 200; width: 320px; background: var(--bg-card); border: 1px solid var(--rule); padding: 16px; font-family: 'IBM Plex Mono'; font-size: 12px; display: none; box-shadow: 0 12px 40px rgba(0,0,0,0.25); }
  .tweaks.open { display: block; }
  .tweaks h5 { margin: 0 0 12px; font-family: 'IBM Plex Mono'; font-size: 11px; color: var(--ink-faint); text-transform: uppercase; letter-spacing: 0.08em; font-weight: 500; display: flex; justify-content: space-between; align-items: center; }
  .tweaks label { display: block; margin-bottom: 14px; color: var(--ink-dim); }
  .tweaks label span { display: block; font-size: 10px; color: var(--ink-faint); margin-bottom: 6px; text-transform: uppercase; letter-spacing: 0.06em; }
  .zh-font-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
  .light-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 6px; }
  .light-opt { display: flex; flex-direction: column; align-items: stretch; gap: 4px; padding: 6px; background: transparent; border: 1px solid var(--rule); color: var(--ink-dim); font-family: inherit; cursor: pointer; transition: border-color .15s, background .15s, color .15s; }
  .light-opt:hover { border-color: var(--accent); color: var(--ink); }
  .light-opt.active { border-color: var(--accent); background: color-mix(in oklab, var(--accent) 14%, transparent); color: var(--ink); }
  .light-swatch { height: 26px; border: 1px solid var(--rule-soft); }
  .light-label { font-size: 9px; color: var(--ink-faint); text-align: center; letter-spacing: 0; line-height: 1.2; text-transform: none; }
  .light-opt.active .light-label { color: var(--ink); }
  .zh-font-opt { display: flex; flex-direction: column; align-items: flex-start; gap: 4px; padding: 8px 10px; background: transparent; border: 1px solid var(--rule); color: var(--ink-dim); font-family: inherit; cursor: pointer; text-align: left; transition: border-color .15s, background .15s, color .15s; }
  .zh-font-opt:hover { border-color: var(--accent); color: var(--ink); }
  .zh-font-opt.active { border-color: var(--accent); background: color-mix(in oklab, var(--accent) 14%, transparent); color: var(--ink); }
  .zh-font-sample { font-size: 18px; line-height: 1; color: var(--ink); }
  .zh-font-label { font-size: 9px; color: var(--ink-faint); text-transform: none; letter-spacing: 0; line-height: 1.25; }
  [data-zhfont-preview="editorial"]    { font-family: 'Noto Serif SC', serif; font-weight: 500; }
  [data-zhfont-preview="modern"]       { font-family: 'Noto Sans SC', sans-serif; font-weight: 700; }
  [data-zhfont-preview="literary"]     { font-family: 'LXGW WenKai TC', serif; font-weight: 400; }
  [data-zhfont-preview="contemporary"] { font-family: 'ZCOOL XiaoWei', serif; font-weight: 400; }
  [data-zhfont-preview="mono-serif"]   { font-family: 'Noto Serif SC', serif; font-weight: 600; }
  [data-zhfont-preview="system"]       { font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif; font-weight: 600; }

  /* ================= Mobile ================= */
  @media (max-width: 720px) {
    .container { padding: 0 18px; }
    section { padding: 60px 0; }

    /* Nav */
    .nav-inner { height: 58px; gap: 10px; }
    .brand { font-size: 14px; gap: 8px; }
    .brand img { width: 22px; height: 22px; }
    .seg { font-size: 11px; }
    .seg button { padding: 6px 8px; }
    .icon-btn { width: 32px; height: 32px; }

    /* Ticker */
    .ticker { padding: 8px 0; font-size: 10.5px; }
    .ticker-track span { margin: 0 22px; }

    /* Hero */
    .hero { padding: 40px 0 32px; }
    .hero-inner { gap: 28px; }
    .h1 { font-size: clamp(38px, 10vw, 68px); line-height: 1.02; margin-top: 18px; }
    body[data-lang="zh"] .h1 { font-size: clamp(32px, 8.6vw, 56px); line-height: 1.08; }
    .lede { margin-top: 20px; font-size: 16.5px; max-width: none; }
    .hero-cta-row { margin-top: 24px; gap: 10px; }
    .btn { padding: 11px 16px; font-size: 12.5px; }
    .hero-stats { grid-template-columns: 1fr 1fr; margin-top: 36px; gap: 1px; }
    .hero-stat { padding: 16px 14px; }
    .hero-stat:nth-child(3) { grid-column: 1 / -1; }
    .hero-stat .cap { font-size: 10px; }
    .hero-stat .v { font-size: 30px; margin-top: 6px; }
    body[data-lang="zh"] .hero-stat .v { font-size: 26px; }
    .hero-stat .l { font-size: 12.5px; margin-top: 4px; }
    .hero-card { padding: 14px; }
    .hero-card-label { font-size: 10px; gap: 8px; flex-wrap: nowrap; }
    .hero-card-label > span:first-child { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; min-width: 0; }
    .hero-card-label .live { white-space: nowrap; flex-shrink: 0; }

    /* Section heads */
    .sec-title { font-size: clamp(28px, 7.3vw, 44px); max-width: none; }
    body[data-lang="zh"] .sec-title { font-size: clamp(26px, 6.6vw, 40px); }
    .sec-sub { font-size: 15.5px; }
    .sec-head-split { gap: 18px; margin-bottom: 32px; }

    /* Question / Modalities */
    .modalities { margin-top: 40px; }
    .mod { padding: 24px 20px; min-height: auto; }
    .mod-title { font-size: 24px; line-height: 1.15; }
    .mod-title span[style] { font-size: 16px !important; }
    .mod-body { font-size: 14px; }

    /* Opportunity */
    .opp-grid { gap: 28px; }
    .quote-block { padding: 4px 0 4px 18px; }
    .quote-block p { font-size: 19px; margin-bottom: 16px; }
    .stat { grid-template-columns: 1fr; align-items: start; gap: 12px; padding: 20px; }
    .stat-num { font-size: 44px; }
    .stat-desc { max-width: none; }

    /* Problem */
    .prob { padding: 28px 22px; min-height: auto; }
    .prob h3 { font-size: 24px; margin: 10px 0 12px; }
    .prob p { font-size: 14.5px; max-width: none; }

    /* Gap */
    .fail { padding: 22px 20px; }
    .fail-head { flex-wrap: wrap; gap: 10px; margin-bottom: 12px; }
    .fail-head .fail-sub { font-size: 17px; }
    .fail h3 { font-size: 17px; }
    .fail-meter { grid-template-columns: 76px 1fr 40px; font-size: 10.5px; }

    /* Solution */
    .solution-wrap { gap: 32px; }
    .engine-card { margin: 0 auto; padding: 18px; max-width: 100%; }
    .pillars { margin-top: 24px; }
    .pill { padding: 14px 0; }

    /* Platform */
    .plat-header { margin-bottom: 28px; }
    .plat-cell { padding: 18px; min-height: auto; }
    .plat-cell h4 { font-size: 22px; }

    /* Modes — stack the 5-column flow into a vertical sequence */
    .modes-block { margin-top: 40px; }
    .mode-card { padding: 22px 20px; gap: 14px; }
    .mode-title { font-size: 22px; }
    .mode-flow {
      grid-template-columns: 1fr;
      gap: 10px;
      justify-items: center;
    }
    .mode-flow > * { width: 100%; max-width: 280px; }
    .mode-node { min-height: 76px; padding: 14px 10px; width: 100%; }
    .mode-arrow { flex-direction: row; gap: 10px; padding: 2px 0; min-height: 28px; }
    .mode-arrow svg { transform: rotate(90deg); }
    .mode-arrow-label { position: static; font-size: 10px; }
    .mode-amplify { flex-direction: column; align-items: flex-start; gap: 4px; padding: 10px 12px; }
    .mode-amplify .amp-value { font-size: 17px; }

    /* Interfaces */
    .ifaces-block { margin-top: 36px; padding-top: 32px; }
    .iface-preview { height: 130px; padding: 12px; }
    .iface-body { padding: 16px 18px 20px; }
    .iface-title { font-size: 17px; }

    /* Values */
    .val { padding: 28px 22px; min-height: auto; }
    .val h3 { font-size: 22px; }

    /* Use cases */
    .verts { grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 32px; }
    .vert { padding: 16px 16px 20px; min-height: 140px; }
    .vert h4 { font-size: 15.5px; }
    .vert p { font-size: 10.5px; }
    .deep { padding: 28px 22px; }
    .deep h3 { font-size: 24px; }
    .deep li { grid-template-columns: 1fr; gap: 4px; padding-top: 12px; }

    /* GTM */
    .gtm { gap: 36px; margin-top: 36px; }
    .buyer {
      grid-template-columns: auto auto 1fr;
      grid-template-rows: auto auto;
      row-gap: 6px;
      padding: 14px 16px;
    }
    .buyer .buyer-tag {
      grid-column: 1 / -1;
      justify-self: start;
      font-size: 10.5px;
    }
    .buyer .buyer-name { font-size: 14px; }
    .model { padding: 18px 20px; }

    /* Team */
    .founders-row { gap: 16px; margin-top: 32px; }
    .team-creds { margin-top: 28px; }
    .founder-card { padding: 22px; gap: 12px; }
    .founder-head { gap: 14px; margin-bottom: 14px; }
    .founder-portrait { width: 60px; height: 60px; }
    .founder-name { font-size: 22px; }
    .founder-bio { font-size: 13.5px; }
    .cred { grid-template-columns: 1fr; gap: 6px; padding: 16px 0; }

    /* Vision / CTA */
    .vision { padding: 88px 0 80px; }
    .vision h2 { font-size: clamp(34px, 9vw, 64px); margin: 18px auto 28px; max-width: 18ch; }
    body[data-lang="zh"] .vision h2 { font-size: clamp(30px, 8vw, 56px); }
    .vision .vision-sub { font-size: 16px; margin-bottom: 28px; }

    /* Footer */
    footer { padding: 40px 0 28px; }
    .footer-inner { gap: 28px; }
    .footer-cols { gap: 32px; }
    .footer-col { min-width: 110px; }
    .footer-legal { margin-top: 32px; flex-direction: column; gap: 8px; }
  }

  @media (max-width: 480px) {
    .container { padding: 0 16px; }
    section { padding: 52px 0; }
    .nav-links { display: none; }
    .nav-cta { display: none; }
    .h1 { font-size: clamp(34px, 11.5vw, 56px); }
    body[data-lang="zh"] .h1 { font-size: clamp(28px, 10vw, 44px); }
    .sec-title { font-size: clamp(26px, 8.5vw, 40px); }
    .lede { font-size: 16px; }
    .verts { grid-template-columns: 1fr; }
    .vert { min-height: auto; padding: 16px; }
    .hero-stat .v { font-size: 32px; }
    body[data-lang="zh"] .hero-stat .v { font-size: 28px; }
    .stat-num { font-size: 38px; }
    .quote-block p { font-size: 17px; }
    .vision h2 { font-size: clamp(28px, 10vw, 48px); max-width: 16ch; }
    body[data-lang="zh"] .vision h2 { font-size: clamp(26px, 9vw, 44px); }
    .aff { font-size: 10px; padding: 5px 8px; }
    .affs { gap: 6px; }
  }

  /* ================= Hamburger + mobile menu + floating CTA ================= */
  .hamburger {
    display: none;
    width: 34px;
    height: 34px;
    border: 1px solid var(--rule);
    border-radius: 2px;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: 0;
    color: var(--ink);
    cursor: pointer;
    transition: border-color .15s, color .15s;
  }
  .hamburger:hover { border-color: var(--accent); color: var(--accent-strong); }
  .hamburger span {
    display: block;
    width: 16px;
    height: 1.5px;
    background: currentColor;
    transition: transform .2s, opacity .2s;
  }
  .hamburger.open span:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
  .hamburger.open span:nth-child(2) { opacity: 0; }
  .hamburger.open span:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }
  @media (max-width: 980px) { .hamburger { display: inline-flex; } }

  .mobile-menu {
    border-top: 1px solid var(--rule-soft);
    background: color-mix(in oklab, var(--bg-raise) 96%, transparent);
    backdrop-filter: blur(14px);
    animation: menuSlideIn .2s ease-out;
  }
  @keyframes menuSlideIn {
    from { opacity: 0; transform: translateY(-8px); }
    to   { opacity: 1; transform: translateY(0); }
  }
  .mobile-menu .container {
    display: flex;
    flex-direction: column;
    padding-top: 8px;
    padding-bottom: 14px;
  }
  .mobile-menu a {
    font-family: 'IBM Plex Mono';
    font-size: 14px;
    color: var(--ink-dim);
    padding: 14px 0;
    border-bottom: 1px solid var(--rule-soft);
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  .mobile-menu a:last-child { border-bottom: none; }
  .mobile-menu a:hover { color: var(--accent-strong); }
  .mobile-menu a.cta { color: var(--accent-strong); font-weight: 600; }

  .mobile-fab {
    position: fixed;
    bottom: 14px;
    right: 14px;
    z-index: 60;
    display: none;
    padding: 11px 16px;
    background: var(--accent);
    color: var(--accent-ink);
    font-family: 'IBM Plex Mono';
    font-size: 12.5px;
    font-weight: 600;
    letter-spacing: 0.01em;
    border-radius: 999px;
    box-shadow: 0 10px 28px rgba(0,0,0,0.22);
    opacity: 0;
    transform: translateY(14px);
    transition: opacity .25s, transform .25s, background .15s;
    pointer-events: none;
    white-space: nowrap;
    align-items: center;
    gap: 6px;
    max-width: calc(100vw - 28px);
  }
  .mobile-fab.visible { opacity: 1; transform: translateY(0); pointer-events: auto; }
  .mobile-fab:hover { background: var(--accent-strong); }
  @media (max-width: 640px) {
    .mobile-fab { display: inline-flex; }
    /* Reserve space so the FAB doesn't overlap last section content */
    main { padding-bottom: 16px; }
    footer .footer-legal { padding-bottom: 56px; }
  }