:root {
    --bg: #03141b;
    --bg2: #06202b;
    --panel: #0b2630;
    --ink: #e8f6f4;
    --muted: #8fb3b0;
    --mint: #69f5e6;
    --gold: #f6c344;
    --red: #ff5c78;
    --line: rgba(105,245,230,.22);
    --mono: "SFMono-Regular", "JetBrains Mono", "DejaVu Sans Mono", Menlo, Consolas, monospace;
    --sans: "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", "Microsoft YaHei", system-ui, sans-serif;
    --ease: cubic-bezier(.22,.9,.3,1);
  }
  * { margin: 0; padding: 0; box-sizing: border-box; }
  html { scroll-behavior: smooth; }
  section, .stats { scroll-margin-top: 64px; }
  body {
    background:
      radial-gradient(1100px 520px at 82% -6%, rgba(105,245,230,.09), transparent 60%),
      radial-gradient(900px 480px at -8% 30%, rgba(246,195,68,.05), transparent 55%),
      var(--bg);
    color: var(--ink);
    font-family: var(--sans);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
  }
  a { color: var(--mint); text-decoration: none; }
  img { display: block; max-width: 100%; }
  .wrap { max-width: 1180px; margin: 0 auto; padding: 0 24px; }
  .eyebrow { font: 700 12px/1.4 var(--mono); letter-spacing: .22em; color: var(--mint); text-transform: uppercase; }
  .gradient { background: linear-gradient(92deg, var(--mint), #9af7b0); -webkit-background-clip: text; background-clip: text; color: transparent; }
  h2.section-title { font-size: clamp(24px, 3.4vw, 40px); font-weight: 800; letter-spacing: .01em; margin-top: 10px; }
  .section-sub { color: var(--muted); margin-top: 8px; max-width: 1040px; line-height: 1.75; }
  section { padding: 72px 0; }

  /* ===== topbar ===== */
  .topbar {
    position: sticky; top: 0; z-index: 50;
    background: rgba(3,20,27,.88);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(105,245,230,.14);
  }
  .topbar .wrap { display: flex; align-items: center; gap: 14px; height: 60px; }
  .brand { display: flex; align-items: center; gap: 10px; color: var(--ink); flex: none; }
  .brand svg { width: 30px; height: 30px; }
  .brand b { font: 800 13px/1.2 var(--mono); letter-spacing: .14em; white-space: nowrap; }
  .brand small { display: block; font: 600 10px/1.2 var(--mono); letter-spacing: .1em; color: var(--muted); }
  .team-badge { padding: 4px 10px; border: 1px solid var(--gold); border-radius: 999px; color: var(--gold); font: 800 11px/1 var(--mono); letter-spacing: .1em; white-space: nowrap; }
  nav.top-nav { margin-left: auto; display: flex; gap: 13px; align-items: center; }
  nav.top-nav a { color: var(--muted); font-size: 14px; transition: color .2s; white-space: nowrap; }
  nav.top-nav a:hover { color: var(--mint); }
  nav.top-nav a.gh { padding: 6px 14px; border: 1px solid var(--line); border-radius: 999px; color: var(--mint); }
  nav.top-nav a.gh:hover { border-color: var(--mint); box-shadow: 0 0 18px rgba(105,245,230,.2); }
  nav.top-nav a.lang { padding: 5px 11px; border: 1px solid rgba(246,195,68,.45); border-radius: 999px; color: var(--gold); font: 800 11px/1.3 var(--mono); letter-spacing: .1em; }
  nav.top-nav a.lang:hover { border-color: var(--gold); box-shadow: 0 0 18px rgba(246,195,68,.2); color: var(--gold); }
  .nav-toggle { display: none; flex: none; width: 40px; height: 36px; padding: 0; border: 1px solid var(--line); border-radius: 10px; background: rgba(3,20,27,.6); cursor: pointer; flex-direction: column; align-items: center; justify-content: center; gap: 5px; transition: border-color .2s; }
  .nav-toggle:hover { border-color: var(--mint); }
  .nav-toggle span { display: block; width: 18px; height: 2px; border-radius: 2px; background: var(--mint); transition: transform .25s var(--ease), opacity .2s; }
  .topbar.menu-open .nav-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .topbar.menu-open .nav-toggle span:nth-child(2) { opacity: 0; }
  .topbar.menu-open .nav-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .mobile-menu { display: none; }
  nav.top-nav a.ext { display: none; } /* external links live in the menu and the footer */
  html[lang="en"] nav.top-nav { gap: 12px; }
  @media (max-width: 1140px) {
    nav.top-nav a:not(.gh):not(.lang) { display: none; }
    .nav-toggle { display: inline-flex; }
    .mobile-menu[hidden] { display: none; }
    .mobile-menu:not([hidden]) { display: grid; grid-template-columns: 1fr 1fr; gap: 2px 18px; padding: 8px 24px 14px; border-top: 1px solid rgba(105,245,230,.12); background: rgba(3,20,27,.96); max-height: calc(100vh - 60px); overflow-y: auto; }
    .mobile-menu a { display: block; padding: 10px 0; color: var(--ink); font-size: 14.5px; border-bottom: 1px solid rgba(105,245,230,.08); }
    .mobile-menu a:hover { color: var(--mint); }
    .mobile-menu a small { color: var(--muted); font: 600 10.5px/1 var(--mono); letter-spacing: .06em; margin-left: 6px; }
    .mobile-menu .mm-label { grid-column: 1 / -1; margin-top: 8px; font: 700 10px/1.6 var(--mono); letter-spacing: .2em; color: var(--muted); text-transform: uppercase; }
  }
  @media (max-width: 720px) {
    .wrap { padding: 0 16px; }
    .topbar .wrap { gap: 8px; flex-wrap: nowrap; }
    .brand { gap: 7px; min-width: 0; flex: 1 1 auto; }
    .brand > span { min-width: 0; }
    .brand svg { width: 24px; height: 24px; }
    .brand small { display: none; }
    .brand b { display: block; font-size: 10px; letter-spacing: .06em; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
    .team-badge { display: none; }
    nav.top-nav { margin-left: 0; flex: none; }
    nav.top-nav { gap: 8px; }
    nav.top-nav a.gh { padding: 4px 9px; font-size: 12px; }
    nav.top-nav a.lang { padding: 4px 8px; font-size: 10px; }
    .nav-toggle { width: 36px; height: 32px; }
    .mobile-menu:not([hidden]) { grid-template-columns: 1fr; padding: 6px 16px 12px; }
  }

  /* ===== orgs bar ===== */
  .orgs-bar { padding: 4px 0 30px; }
  .orgs-bar .wrap { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 14px 18px; }
  .orgs-bar .org-label { flex-basis: 100%; text-align: center; margin-bottom: 6px; font: 700 11px/1.4 var(--mono); letter-spacing: .24em; color: var(--muted); text-transform: uppercase; }
  .orgs-bar .org { display: flex; align-items: center; justify-content: center; height: 68px; padding: 10px 20px; background: #fff; border-radius: 12px; box-shadow: 0 4px 18px rgba(0,0,0,.28); }
  .orgs-bar .org img { height: 38px; width: auto; display: block; }
  .orgs-bar .org img.seal { height: 48px; }
  .orgs-bar .org img.slim { height: 32px; }
  @media (max-width: 720px) { .orgs-bar .org { height: 54px; padding: 8px 12px; } .orgs-bar .org img { height: 28px; } .orgs-bar .org img.seal { height: 36px; } .orgs-bar .org img.slim { height: 24px; } }

  /* ===== champion bar ===== */
  .champ-bar {
    display: block;
    background: linear-gradient(92deg, rgba(246,195,68,.16), rgba(246,195,68,.05) 45%, rgba(246,195,68,.16));
    border-bottom: 1px solid rgba(246,195,68,.35);
  }
  .champ-bar .wrap {
    display: flex; align-items: center; justify-content: center; gap: 12px;
    min-height: 44px; padding-top: 8px; padding-bottom: 8px; flex-wrap: wrap; text-align: center;
  }
  .champ-bar .cup { font-size: 17px; line-height: 1; }
  .champ-bar b { color: var(--gold); font: 800 14px/1.4 var(--sans, inherit); letter-spacing: .04em; }
  .champ-bar small { color: rgba(246,195,68,.82); font: 650 12.5px/1.4 var(--mono); letter-spacing: .06em; }
  .champ-bar:hover b { text-decoration: underline; text-underline-offset: 3px; }
  @media (max-width: 720px) { .champ-bar small { display: none; } }

  /* ===== hero ===== */
  .hero { padding: 84px 0 64px; }
  .hero .wrap { display: grid; grid-template-columns: minmax(0, 48fr) minmax(0, 52fr); gap: 56px; align-items: stretch; }
  @media (max-width: 960px) { .hero .wrap { grid-template-columns: minmax(0, 1fr); } }
  .hero h1 { font-size: clamp(25px, 3.1vw, 43px); font-weight: 850; line-height: 1.2; letter-spacing: .01em; margin-top: 14px; white-space: nowrap; }
  .hero h1 .h1-sub { display: block; margin-top: 12px; font-size: clamp(16px, 1.75vw, 25px); font-weight: 780; letter-spacing: .03em; white-space: nowrap; }
  @media (max-width: 960px) { .hero h1, .hero h1 .h1-sub { white-space: normal; } }
  html[lang="en"] .hero h1 { white-space: normal; font-size: clamp(25px, 2.9vw, 40px); }
  html[lang="en"] .hero h1 .h1-sub { white-space: normal; font-size: clamp(16px, 1.6vw, 23px); }
  html[lang="en"] .req-row { grid-template-columns: 240px 1fr; }
  @media (max-width: 720px) { html[lang="en"] .req-row { grid-template-columns: 1fr; } }
  .hero .sub { margin-top: 18px; color: var(--muted); font-size: clamp(15px, 1.3vw, 17px); max-width: 520px; }
  .hero .sub b { color: var(--ink); font-weight: 700; }
  .hero-quote { margin-top: 18px; padding: 14px 18px; border-left: 3px solid var(--mint); border-radius: 0 12px 12px 0; background: rgba(105,245,230,.06); max-width: 540px; }
  .hero-quote .q-who { display: block; font: 700 11px/1.5 var(--mono); color: var(--mint); letter-spacing: .06em; margin-bottom: 6px; font-style: normal; }
  .hero-quote p { margin: 0; color: var(--ink); font-size: clamp(15px, 1.35vw, 17.5px); font-weight: 700; line-height: 1.65; }
  .pain-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; margin-top: 12px; max-width: 560px; }
  .pain-card { border: 1px solid var(--line); border-radius: 12px; padding: 10px 12px; background: rgba(255,255,255,.02); display: flex; flex-direction: column; }
  .pain-card .role { align-self: flex-start; font: 700 10.5px/1.7 var(--mono); color: var(--mint); letter-spacing: .04em; border: 1px solid rgba(105,245,230,.3); border-radius: 6px; padding: 0 7px; }
  .pain-card p { margin: 7px 0 0; color: var(--muted); font-size: 12.5px; line-height: 1.55; flex: 1; }
  .pain-card .pl-tag { display: block; margin-top: 7px; font: 700 11px/1.4 var(--mono); color: var(--gold); }
  @media (max-width: 520px) { .pain-grid { grid-template-columns: 1fr; } }
  .hero-band { grid-column: 1 / -1; margin-top: 8px; padding: 16px 22px; border: 1px solid var(--line); border-radius: 16px; background: rgba(255,255,255,.02); display: flex; flex-direction: column; gap: 12px; align-items: center; }
  .hero-flow { display: flex; flex-wrap: wrap; justify-content: center; align-items: stretch; gap: 8px; }
  .hero-flow i { font-style: normal; color: var(--muted); font: 700 13px/1 var(--mono); opacity: .7; align-self: center; }
  .hf-step { --fc: var(--mint); display: inline-flex; flex-direction: column; align-items: center; justify-content: center; gap: 3px; padding: 8px 16px; border: 1px solid var(--line); border-radius: 12px; background: rgba(255,255,255,.02); }
  .hf-step b { font-size: 13.5px; font-weight: 780; color: var(--ink); white-space: nowrap; }
  .hf-step small { font: 650 9.5px/1.3 var(--mono); color: var(--fc); letter-spacing: .05em; white-space: nowrap; }
  .hf-step.gold { --fc: var(--gold); border-color: rgba(246,195,68,.35); }
  .hf-step.red { --fc: var(--red); border-color: rgba(255,92,120,.35); }
  a.hf-step { transition: border-color .2s, transform .2s; }
  a.hf-step:hover { border-color: var(--fc); transform: translateY(-2px); }
  .hero-formula { margin: 0; font: 650 13px/1.6 var(--mono); color: var(--muted); letter-spacing: .02em; text-align: center; }
  .hero-formula b { color: var(--gold); font-weight: 750; }
  .chip-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 22px; }
  .chip { padding: 5px 12px; border: 1px solid var(--line); border-radius: 999px; color: var(--muted); font: 650 12px/1.4 var(--mono); }
  .chip.hot { border-color: rgba(246,195,68,.55); color: var(--gold); }
  a.chip { transition: color .2s, border-color .2s; }
  a.chip:hover { color: var(--mint); border-color: var(--mint); }
  .cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
  .btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 22px; border-radius: 999px; font-weight: 750; font-size: 15px; transition: transform .2s, box-shadow .2s, border-color .2s; }
  .btn.primary { background: linear-gradient(92deg, var(--mint), #6ef0a8); color: #04222b; box-shadow: 0 10px 34px rgba(105,245,230,.25); }
  .btn.primary:hover { transform: translateY(-2px); box-shadow: 0 16px 44px rgba(105,245,230,.35); }
  .btn.ghost { border: 1px solid var(--line); color: var(--ink); }
  .btn.ghost:hover { border-color: var(--mint); transform: translateY(-2px); }
  .hero-note { margin-top: 14px; color: var(--muted); font-size: 12.5px; }

  .browser-card { display: flex; flex-direction: column; border: 1px solid rgba(105,245,230,.3); border-radius: 14px; overflow: hidden; background: var(--panel); box-shadow: 0 30px 90px rgba(0,0,0,.5), 0 0 40px rgba(105,245,230,.06); transition: transform .35s var(--ease), box-shadow .35s; }
  .hero .browser-card .shot { flex: 1; min-height: 0; }
  .hero .browser-card .shot img { width: 100%; height: 100%; object-fit: contain; object-position: center; display: block; background: #061b22; }
  .browser-card:hover { transform: translateY(-6px); box-shadow: 0 42px 110px rgba(0,0,0,.6), 0 0 56px rgba(105,245,230,.12); }
  .browser-bar { display: flex; align-items: center; gap: 8px; padding: 10px 14px; background: rgba(3,20,27,.92); border-bottom: 1px solid rgba(105,245,230,.16); }
  .browser-bar i { width: 10px; height: 10px; border-radius: 50%; background: #2d4a52; }
  .browser-bar i:nth-child(1) { background: #ff5f57; } .browser-bar i:nth-child(2) { background: #febc2e; } .browser-bar i:nth-child(3) { background: #28c840; }
  .browser-bar span { margin-left: 8px; font: 600 11px/1 var(--mono); color: var(--muted); letter-spacing: .04em; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0; flex: 1; }
  .browser-bar em { margin-left: auto; font: 700 10px/1 var(--mono); color: var(--mint); font-style: normal; letter-spacing: .12em; }
  .browser-card .shot { position: relative; }
  .browser-card .shot::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 62%, rgba(3,20,27,.55)); }
  .shot-caption { position: absolute; z-index: 2; left: 14px; bottom: 12px; right: 14px; display: flex; justify-content: space-between; align-items: baseline; gap: 10px; }
  .shot-caption b { font-size: 13.5px; }
  .shot-caption span { font: 650 10.5px/1.4 var(--mono); color: var(--mint); letter-spacing: .06em; white-space: nowrap; }

  /* ===== stats band ===== */
  .stats { padding: 40px 0 30px; border-top: 1px solid rgba(105,245,230,.12); border-bottom: 1px solid rgba(105,245,230,.12); background: rgba(6,32,43,.5); }
  .stats-head { display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap; }
  .stats-head .eyebrow { color: var(--gold); }
  .stats-head span.date { color: var(--muted); font: 600 12px/1.4 var(--mono); }
  .stats-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 18px; margin-top: 20px; }
  @media (max-width: 960px) { .stats-grid { grid-template-columns: repeat(3, 1fr); } }
  @media (max-width: 560px) { .stats-grid { grid-template-columns: repeat(2, 1fr); } }
  .stat { border-left: 2px solid rgba(105,245,230,.2); padding-left: 14px; }
  .stat.warn { border-left-color: rgba(246,195,68,.4); }
  .stat b { display: block; font: 800 clamp(22px, 2.6vw, 34px)/1.1 var(--mono); color: var(--mint); font-variant-numeric: tabular-nums; }
  .stat.warn b { color: var(--gold); }
  .stat span { display: block; margin-top: 6px; color: var(--muted); font-size: 12.5px; line-height: 1.5; }
  .stats-caveat { margin-top: 18px; color: var(--muted); font-size: 12.5px; border-left: 2px solid var(--gold); padding-left: 12px; }
  .stats-caveat b { color: var(--gold); }

  /* ===== challenge ===== */
  .req-rows { display: flex; flex-direction: column; gap: 14px; margin-top: 36px; }
  .req-row { display: grid; grid-template-columns: 200px 1fr; gap: 12px 28px; align-items: center; border: 1px solid rgba(105,245,230,.2); border-radius: 12px; background: var(--panel); padding: 20px 24px; transition: border-color .25s, transform .25s; }
  .req-row:hover { border-color: rgba(105,245,230,.5); transform: translateX(4px); }
  .req-head { display: flex; align-items: center; gap: 14px; }
  .req-no { flex: none; font: 800 13px/1 var(--mono); color: var(--c, var(--mint)); border: 1px solid var(--c, var(--mint)); border-radius: 8px; padding: 9px 10px; }
  .req-name b { display: block; font-size: 16.5px; }
  .req-name small { font: 700 10px/1.7 var(--mono); letter-spacing: .16em; color: var(--muted); }
  .req-row p { color: var(--muted); font-size: 14px; line-height: 1.7; }
  .req-row p b { color: var(--ink); font-weight: 700; }
  @media (max-width: 720px) { .req-row { grid-template-columns: 1fr; padding: 18px 20px; } }
  .req-bridge { margin-top: 24px; color: var(--muted); font-size: 13.5px; border-left: 2px solid var(--mint); padding-left: 12px; }
  .req-bridge a { font-weight: 700; }

  /* ===== deliverable cards ===== */
  .cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-top: 36px; }
  @media (max-width: 960px) { .cards { grid-template-columns: repeat(2, 1fr); } }
  @media (max-width: 620px) { .cards { grid-template-columns: 1fr; } }
  .card { display: flex; flex-direction: column; border: 1px solid rgba(105,245,230,.2); border-radius: 14px; overflow: hidden; background: var(--panel); transition: transform .3s var(--ease), box-shadow .3s, border-color .3s; }
  .card:hover { transform: translateY(-6px); border-color: rgba(105,245,230,.5); box-shadow: 0 24px 64px rgba(0,0,0,.45); }
  .card .thumb { position: relative; aspect-ratio: 16/9; overflow: hidden; }
  .card .thumb img { width: 100%; height: 100%; object-fit: cover; object-position: center 30%; transition: transform .45s var(--ease); }
  .card:hover .thumb img { transform: scale(1.04); }
  .card .thumb::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(3,20,27,.4) 0%, transparent 30%, transparent 70%, rgba(11,38,48,.9)); }
  .card .tag { position: absolute; z-index: 2; top: 10px; left: 10px; padding: 4px 10px; border-radius: 999px; border: 1px solid var(--c, var(--mint)); background: rgba(3,20,27,.88); color: var(--c, var(--mint)); font: 800 10.5px/1 var(--mono); letter-spacing: .1em; }
  .card .body { display: flex; flex-direction: column; flex: 1; padding: 16px 18px 18px; }
  .card h3 { font-size: 17px; font-weight: 780; }
  .card p { margin-top: 8px; color: var(--muted); font-size: 13.5px; flex: 1; }
  .card .links { display: flex; flex-wrap: wrap; gap: 10px 16px; margin-top: 14px; }
  .card .links a { font: 700 13px/1.4 var(--sans); }
  .card .links a:hover { text-decoration: underline; }
  .card .links a.minor { color: var(--muted); }
  .card.skill-card .thumb { background: #041920; display: flex; align-items: center; justify-content: center; }
  .term-mini { width: 88%; border: 1px solid rgba(105,245,230,.3); border-radius: 8px; background: #02141b; font: 600 11.5px/1.9 var(--mono); padding: 12px 14px; color: var(--muted); }
  .term-mini .cmd { color: var(--ink); }
  .term-mini .ok { color: #6ef0a8; }
  .term-mini b { color: var(--mint); font-weight: 700; }

  /* ===== how it works: six design commitments ===== */
  .how { background: rgba(6,32,43,.35); border-top: 1px solid rgba(105,245,230,.12); }
  .principle { margin-top: 26px; display: flex; flex-wrap: wrap; align-items: center; gap: 10px 18px; padding: 14px 20px; border: 1px solid rgba(246,195,68,.4); border-radius: 12px; background: rgba(246,195,68,.05); }
  .principle b { color: var(--gold); font: 800 15px/1.4 var(--sans); letter-spacing: .02em; }
  .principle span { color: var(--muted); font-size: 13px; line-height: 1.6; }
  .principle span em { color: var(--ink); font-style: normal; font-weight: 700; }
  .loop-steps { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin-top: 10px; }
  .loop-steps span { padding: 4px 9px; border: 1px solid rgba(246,195,68,.4); border-radius: 8px; color: var(--ink); font: 650 11px/1.4 var(--mono); }
  .loop-steps i { color: var(--muted); font-style: normal; font: 700 11px/1 var(--mono); }
  .how-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 22px; }
  @media (max-width: 1000px) { .how-grid { grid-template-columns: repeat(2, 1fr); } }
  @media (max-width: 620px) { .how-grid { grid-template-columns: 1fr; } }
  .how-card { display: flex; flex-direction: column; border: 1px solid rgba(105,245,230,.2); border-radius: 14px; background: var(--panel); padding: 20px 20px 18px; transition: border-color .25s, transform .25s; }
  .how-card:hover { border-color: var(--c, rgba(105,245,230,.55)); transform: translateY(-4px); }
  .how-head { display: flex; align-items: center; gap: 12px; }
  .how-no { flex: none; display: grid; place-items: center; width: 38px; height: 38px; border: 1px solid var(--c, var(--mint)); border-radius: 10px; color: var(--c, var(--mint)); font: 800 13px/1 var(--mono); }
  .how-head b { font-size: 16px; line-height: 1.35; }
  .how-card .promise { margin-top: 12px; color: var(--ink); font-size: 13.5px; line-height: 1.7; font-weight: 600; }
  .how-card .detail { margin-top: 8px; color: var(--muted); font-size: 13px; line-height: 1.7; flex: 1; }
  .how-card .detail b { color: var(--ink); font-weight: 700; }
  .how-card .detail code { font: 650 11.5px/1.6 var(--mono); color: var(--c, var(--mint)); }
  .how-foot { margin-top: 14px; padding-top: 12px; border-top: 1px solid rgba(105,245,230,.12); display: flex; flex-direction: column; gap: 6px; }
  .how-foot .row { display: flex; flex-wrap: wrap; gap: 4px 14px; align-items: center; }
  .how-foot .lbl { font: 700 10px/1.4 var(--mono); letter-spacing: .14em; color: var(--muted); }
  .how-foot a { font: 700 12.5px/1.6 var(--mono); color: var(--c, var(--mint)); }
  .how-foot a:hover { text-decoration: underline; }
  .how-foot a.site { color: var(--ink); font-family: var(--sans); font-size: 12.5px; }

  /* ===== quick start ===== */
  .qs-grid { display: grid; grid-template-columns: minmax(0, 46fr) minmax(0, 54fr); grid-template-areas: "s1 s2" "s3 s4"; gap: 18px 22px; margin-top: 34px; align-items: stretch; }
  .qs-box { display: flex; flex-direction: column; min-width: 0; border: 1px solid rgba(105,245,230,.22); border-radius: 14px; background: var(--panel); padding: 18px 20px 20px; }
  .qs-box.s1 { grid-area: s1; } .qs-box.s2 { grid-area: s2; } .qs-box.s3 { grid-area: s3; } .qs-box.s4 { grid-area: s4; }
  .qs-box.hot { border-color: rgba(246,195,68,.45); }
  .qs-box .grow { flex: 1; }
  .qs-chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
  .qs-chips span { padding: 4px 9px; border: 1px solid var(--line); border-radius: 999px; color: var(--muted); font: 650 11px/1.4 var(--mono); }
  .qs-list { margin: 10px 0 0; padding: 0; list-style: none; }
  .qs-list li { position: relative; padding-left: 16px; margin-top: 6px; color: var(--muted); font-size: 12.8px; line-height: 1.6; }
  .qs-list li::before { content: "▸"; position: absolute; left: 0; color: var(--c, var(--mint)); }
  .qs-list li code { font: 650 11.5px/1.6 var(--mono); color: var(--ink); }
  @media (max-width: 960px) { .qs-grid { grid-template-columns: 1fr; grid-template-areas: "s1" "s2" "s3" "s4"; gap: 16px; } }
  .qs-box .step { display: flex; align-items: center; gap: 10px; }
  .qs-box .step i { flex: none; display: grid; place-items: center; width: 26px; height: 26px; border-radius: 50%; background: var(--c, var(--mint)); color: #04222b; font: 800 12px/1 var(--mono); font-style: normal; }
  .qs-box .step b { font-size: 15.5px; }
  .qs-box p { margin-top: 8px; color: var(--muted); font-size: 13px; line-height: 1.7; }
  .qs-box p b { color: var(--ink); }
  .qs-box p code, .qs-more code { font: 650 12px/1.6 var(--mono); color: var(--mint); }
  .code { position: relative; margin-top: 12px; border: 1px solid rgba(105,245,230,.25); border-radius: 10px; background: #02141b; padding: 34px 14px 12px; overflow-x: auto; }
  .code pre { margin: 0; font: 600 12px/1.75 var(--mono); color: var(--ink); white-space: pre; }
  .code pre .c { color: var(--muted); }
  .code pre .k { color: var(--mint); }
  .copy-btn { position: absolute; top: 7px; right: 8px; padding: 4px 10px; border: 1px solid var(--line); border-radius: 999px; background: rgba(3,20,27,.9); color: var(--muted); font: 700 10.5px/1.4 var(--mono); letter-spacing: .06em; cursor: pointer; transition: color .2s, border-color .2s; }
  .copy-btn:hover { color: var(--mint); border-color: var(--mint); }
  .copy-btn.done { color: #6ef0a8; border-color: #6ef0a8; }
  .prompt-box { position: relative; margin-top: 12px; border: 1px solid rgba(246,195,68,.35); border-left: 3px solid var(--gold); border-radius: 0 12px 12px 0; background: rgba(246,195,68,.05); padding: 16px 18px 16px 18px; }
  .prompt-box p { margin: 0; color: var(--ink); font-size: 14px; line-height: 1.85; font-weight: 500; padding-right: 56px; }
  .prompt-box .slot { padding: 1px 7px; border-radius: 6px; background: rgba(246,195,68,.18); border: 1px solid rgba(246,195,68,.55); color: var(--gold); font-weight: 800; white-space: nowrap; }
  .slot-table { width: 100%; margin-top: 12px; border-collapse: collapse; font-size: 12.5px; }
  .slot-table th, .slot-table td { padding: 7px 10px; text-align: left; border-bottom: 1px solid rgba(105,245,230,.1); vertical-align: top; }
  .slot-table th { font: 750 10.5px/1.5 var(--mono); letter-spacing: .1em; color: var(--muted); }
  .slot-table td:first-child { color: var(--gold); font-weight: 800; white-space: nowrap; }
  .slot-table td:last-child { color: var(--muted); font-family: var(--mono); font-size: 11.5px; }
  .slot-table tr:last-child td { border-bottom: none; }
  .qs-more { margin-top: 12px; color: var(--muted); font-size: 12.5px; line-height: 1.7; }
  .qs-more a { font-weight: 700; }

  /* ===== evidence (two runs) ===== */
  .evidence { background: rgba(6,32,43,.45); border-top: 1px solid rgba(105,245,230,.12); border-bottom: 1px solid rgba(105,245,230,.12); }
  .run-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 36px; }
  @media (max-width: 1100px) { .run-grid { grid-template-columns: 1fr; } }
  .run-card { border: 1px solid rgba(105,245,230,.22); border-radius: 14px; background: var(--panel); padding: 24px 24px; }
  .run-card.red { border-color: rgba(255,92,120,.42); }
  .run-card.red .kicker { color: var(--red); }
  .run-card.gold { border-color: rgba(246,195,68,.4); }
  .run-card .kicker { font: 800 11px/1.4 var(--mono); letter-spacing: .18em; color: var(--mint); }
  .run-card.gold .kicker { color: var(--gold); }
  .run-card h3 { margin-top: 8px; font-size: 18px; font-weight: 800; }
  .run-card ul { margin: 14px 0 0; padding: 0; list-style: none; }
  .run-card li { position: relative; padding-left: 18px; margin-top: 9px; color: var(--muted); font-size: 14px; }
  .run-card li::before { content: "▸"; position: absolute; left: 0; color: var(--mint); }
  .run-card.gold li::before { color: var(--gold); }
  .run-card li b { color: var(--ink); font-family: var(--mono); }
  .run-card .links { margin-top: 18px; display: flex; flex-wrap: wrap; gap: 10px 18px; font-weight: 700; font-size: 13.5px; }
  .honesty { margin-top: 26px; padding: 18px 22px; border: 1px solid rgba(246,195,68,.4); border-radius: 12px; background: rgba(246,195,68,.05); color: var(--muted); font-size: 13.5px; }
  .honesty b { color: var(--gold); }

  /* ===== research: papers + database comparison ===== */
  .research-grid { display: grid; grid-template-columns: minmax(0, 58fr) minmax(0, 42fr); gap: 26px; margin-top: 36px; align-items: start; }
  @media (max-width: 960px) { .research-grid { grid-template-columns: 1fr; } }
  .paper-list { display: flex; flex-direction: column; gap: 12px; }
  .paper-item { display: flex; gap: 14px; align-items: flex-start; border: 1px solid rgba(105,245,230,.2); border-radius: 12px; padding: 15px 18px; background: var(--panel); transition: border-color .25s, transform .25s; }
  .paper-item:hover { border-color: rgba(105,245,230,.5); transform: translateX(4px); }
  .paper-item i { flex: none; display: grid; place-items: center; width: 40px; height: 40px; border: 1px solid var(--c, var(--mint)); border-radius: 10px; color: var(--c, var(--mint)); font: 800 13px/1 var(--mono); font-style: normal; }
  .paper-item .p-body { min-width: 0; flex: 1; }
  .paper-item b { display: block; font-size: 14.5px; color: var(--ink); line-height: 1.45; }
  .paper-item .p-num { display: block; margin-top: 4px; color: var(--muted); font-size: 12.5px; line-height: 1.55; }
  .paper-item .p-num em { color: var(--mint); font-style: normal; font-family: var(--mono); font-weight: 700; }
  .paper-item .p-meta { display: flex; flex-wrap: wrap; gap: 6px 14px; margin-top: 8px; align-items: center; }
  .paper-item .p-status { padding: 3px 9px; border-radius: 999px; border: 1px solid var(--c, var(--mint)); color: var(--c, var(--mint)); font: 750 10.5px/1.3 var(--mono); }
  .paper-item .p-meta a { font-weight: 700; font-size: 12.5px; }
  .paper-item .p-meta span.venue { color: var(--muted); font-size: 11.5px; font-family: var(--mono); }
  .fig-stack { display: flex; flex-direction: column; gap: 16px; position: sticky; top: 84px; }
  .fig-card { border: 1px solid rgba(105,245,230,.28); border-radius: 12px; overflow: hidden; background: #fff; }
  .fig-card img { width: 100%; }
  .fig-card figcaption { padding: 10px 14px; background: var(--panel); color: var(--muted); font-size: 12px; line-height: 1.55; border-top: 1px solid rgba(105,245,230,.16); }
  .fig-card figcaption b { color: var(--ink); }
  /* five-paper cards */
  .pcards { display: flex; flex-direction: column; gap: 16px; margin-top: 36px; }
  .pcard { border: 1px solid rgba(105,245,230,.2); border-radius: 14px; background: var(--panel); padding: 18px 20px 20px; transition: border-color .25s; }
  .pcard:hover { border-color: rgba(105,245,230,.5); }
  .pc-head { display: flex; gap: 14px; align-items: flex-start; flex-wrap: wrap; }
  .pc-head i { flex: none; display: grid; place-items: center; width: 40px; height: 40px; border: 1px solid var(--c, var(--mint)); border-radius: 10px; color: var(--c, var(--mint)); font: 800 13px/1 var(--mono); font-style: normal; }
  .pc-title { flex: 1 1 320px; min-width: 0; }
  .pc-title b { display: block; font-size: 16px; color: var(--ink); line-height: 1.4; }
  .pc-q { display: block; margin-top: 5px; font-size: 12.8px; line-height: 1.6; color: var(--muted); }
  .pc-q b { display: inline; color: var(--c, var(--mint)); font-family: var(--mono); font-size: 11px; letter-spacing: .05em; margin-right: 4px; }
  .pc-side { flex: none; display: flex; flex-direction: column; gap: 6px; align-items: flex-end; text-align: right; }
  .pc-side .p-status { padding: 3px 9px; border-radius: 999px; border: 1px solid var(--c, var(--mint)); color: var(--c, var(--mint)); font: 750 10.5px/1.3 var(--mono); }
  .pc-side .venue { color: var(--muted); font-size: 11px; font-family: var(--mono); }
  .pc-side a { font-weight: 700; font-size: 12.5px; }
  .pc-find { margin-top: 12px; font-size: 13px; line-height: 1.7; color: var(--muted); }
  .pc-find b { color: var(--ink); }
  .pc-find em { color: var(--mint); font-style: normal; font-family: var(--mono); font-weight: 700; }
  .pc-figs { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 14px; align-items: stretch; }
  .pc-figs figure { border: 1px solid rgba(105,245,230,.25); border-radius: 10px; overflow: hidden; background: #fff; margin: 0; display: flex; flex-direction: column; }
  .pc-figs img { width: 100%; display: block; height: 272px; object-fit: contain; background: #fff; padding: 6px; box-sizing: border-box; }
  .pc-figs figcaption { margin-top: auto; padding: 8px 12px; background: var(--panel); color: var(--muted); font-size: 11.5px; line-height: 1.5; border-top: 1px solid rgba(105,245,230,.16); }
  .pc-figs figcaption b { color: var(--c, var(--mint)); font-family: var(--mono); font-size: 10.5px; letter-spacing: .05em; margin-right: 6px; }
  @media (max-width: 760px) { .pc-figs { grid-template-columns: 1fr; } .pc-side { align-items: flex-start; text-align: left; } }
  /* database intro cards */
  .db-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 20px; }
  @media (max-width: 960px) { .db-cards { grid-template-columns: 1fr 1fr; } }
  @media (max-width: 640px) { .db-cards { grid-template-columns: 1fr; } }
  .db-card { border: 1px solid rgba(105,245,230,.18); border-radius: 12px; background: var(--panel); padding: 14px 16px; display: flex; flex-direction: column; gap: 7px; }
  .db-card.us-card { border-color: rgba(105,245,230,.55); background: rgba(105,245,230,.06); }
  .db-head { display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap; }
  .db-head b { color: var(--ink); font-size: 13.5px; }
  .db-tag { padding: 2px 8px; border-radius: 999px; border: 1px solid var(--c, var(--gold)); color: var(--c, var(--gold)); font: 750 10px/1.3 var(--mono); }
  .db-card p { color: var(--muted); font-size: 12.3px; line-height: 1.65; flex: 1; margin: 0; }
  .db-card p b { color: var(--ink); font-family: var(--mono); }
  .db-card .db-links { font-size: 11.5px; font-weight: 700; font-family: var(--mono); line-height: 1.7; }
  /* question-by-question comparison */
  .glance-wrap { margin-top: 30px; overflow-x: auto; border: 1px solid rgba(105,245,230,.25); border-radius: 14px; background: var(--panel); }
  table.glance { width: 100%; border-collapse: collapse; font-size: 13.5px; min-width: 760px; }
  table.glance th, table.glance td { padding: 12px 16px; text-align: left; border-bottom: 1px solid rgba(105,245,230,.1); vertical-align: top; }
  table.glance thead th { font: 750 11.5px/1.5 var(--mono); letter-spacing: .08em; color: var(--muted); background: rgba(3,20,27,.7); white-space: nowrap; }
  table.glance thead th:last-child, table.glance td:last-child { background: rgba(105,245,230,.055); }
  table.glance tbody tr:last-child td { border-bottom: none; }
  table.glance td.dim2 { color: var(--muted); }
  table.glance b.cap { color: var(--ink); font-weight: 700; }
  .mk { display: inline-block; font: 800 13px/1 var(--mono); margin-right: 7px; }
  .mk.yes { color: var(--mint); } .mk.part { color: var(--gold); } .mk.no { color: rgba(154,178,186,.55); }
  .glance-note { margin-top: 10px; color: var(--muted); font-size: 12.5px; }
  .q-rows { display: flex; flex-direction: column; gap: 10px; margin-top: 20px; }
  .q-row { display: grid; grid-template-columns: minmax(0,26fr) minmax(0,37fr) minmax(0,37fr); border: 1px solid rgba(105,245,230,.18); border-radius: 12px; overflow: hidden; background: var(--panel); }
  .q-row .q { padding: 13px 16px; }
  .q-row .q b { display: block; color: var(--ink); font-size: 13px; line-height: 1.5; }
  .q-row .q span { display: block; margin-top: 4px; color: var(--muted); font-size: 11.5px; line-height: 1.55; }
  .q-row .them, .q-row .us2 { padding: 13px 16px; font-size: 12.3px; line-height: 1.65; }
  .q-row .them { color: var(--muted); border-left: 1px solid rgba(105,245,230,.12); }
  .q-row .us2 { color: var(--ink); border-left: 1px solid rgba(105,245,230,.12); background: rgba(105,245,230,.05); }
  .q-row .them::before, .q-row .us2::before { display: block; font: 750 10px/1.3 var(--mono); letter-spacing: .06em; margin-bottom: 5px; }
  .q-row .them::before { content: "同类库"; color: var(--gold); }
  .q-row .us2::before { content: "GGA 本项目"; color: var(--mint); }
  .q-row .us2 b { color: var(--mint); font-family: var(--mono); }
  @media (max-width: 860px) { .q-row { grid-template-columns: 1fr; } .q-row .them, .q-row .us2 { border-left: none; border-top: 1px solid rgba(105,245,230,.12); } }
  .cmp-block { margin-top: 44px; }
  .cmp-scroll { overflow-x: auto; margin-top: 18px; border: 1px solid rgba(105,245,230,.2); border-radius: 12px; }
  table.cmp { width: 100%; min-width: 760px; border-collapse: collapse; font-size: 12.8px; line-height: 1.55; }
  table.cmp th { text-align: left; padding: 12px 14px; background: rgba(3,20,27,.85); color: var(--mint); font: 750 12px/1.4 var(--mono); letter-spacing: .04em; border-bottom: 1px solid rgba(105,245,230,.3); white-space: nowrap; }
  table.cmp td { padding: 11px 14px; border-bottom: 1px solid rgba(105,245,230,.1); color: var(--muted); vertical-align: top; }
  table.cmp tr:last-child td { border-bottom: none; }
  table.cmp td:first-child { color: var(--gold); font-weight: 750; white-space: nowrap; }
  table.cmp td.us { color: var(--ink); }
  table.cmp td.us b { color: var(--mint); font-family: var(--mono); }
  .cmp-verdict { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 20px; }
  @media (max-width: 860px) { .cmp-verdict { grid-template-columns: 1fr; } }
  .verdict { border-top: 3px solid var(--c, var(--mint)); padding: 12px 4px 0; }
  .verdict code { color: var(--c, var(--mint)); font: 800 13px/1.3 var(--mono); }
  .verdict p { margin-top: 7px; color: var(--muted); font-size: 12.8px; line-height: 1.6; }

  /* ===== video / presentation ===== */
  .media-grid { display: grid; grid-template-columns: minmax(0, 62fr) minmax(0, 38fr); gap: 26px; margin-top: 36px; align-items: start; }
  @media (max-width: 900px) { .media-grid { grid-template-columns: 1fr; } }
  .video-shell { border: 1px solid rgba(105,245,230,.3); border-radius: 14px; overflow: hidden; background: #000; box-shadow: 0 26px 80px rgba(0,0,0,.5); }
  .video-shell video { display: block; width: 100%; height: auto; }
  .video-note { margin-top: 10px; color: var(--muted); font-size: 12.5px; }
  .present-list { display: flex; flex-direction: column; gap: 14px; }
  .present-item { display: flex; gap: 14px; align-items: flex-start; border: 1px solid rgba(105,245,230,.2); border-radius: 12px; padding: 16px 18px; background: var(--panel); transition: border-color .25s, transform .25s; }
  .present-item:hover { border-color: rgba(105,245,230,.5); transform: translateX(4px); }
  .present-item i { flex: none; display: grid; place-items: center; width: 40px; height: 40px; border: 1px solid var(--c, var(--mint)); border-radius: 10px; color: var(--c, var(--mint)); font: 800 13px/1 var(--mono); font-style: normal; }
  .present-item b { display: block; font-size: 15px; color: var(--ink); }
  .present-item span { display: block; margin-top: 3px; color: var(--muted); font-size: 12.5px; line-height: 1.55; }

  /* ===== materials ===== */
  .mat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 36px; }
  @media (max-width: 960px) { .mat-grid { grid-template-columns: repeat(2, 1fr); } }
  @media (max-width: 520px) { .mat-grid { grid-template-columns: 1fr; } }
  .mat { border: 1px solid rgba(105,245,230,.2); border-radius: 12px; padding: 18px 20px; background: var(--panel); transition: border-color .25s, transform .25s; }
  .mat:hover { border-color: rgba(105,245,230,.5); transform: translateY(-4px); }
  .mat .kind { font: 800 10.5px/1.4 var(--mono); letter-spacing: .16em; color: var(--c, var(--mint)); }
  .mat b { display: block; margin-top: 6px; font-size: 15px; color: var(--ink); }
  .mat span { display: block; margin-top: 4px; color: var(--muted); font-size: 12px; }

  /* ===== footer ===== */
  footer { border-top: 1px solid rgba(105,245,230,.14); padding: 48px 0 60px; background: rgba(3,16,22,.7); }
  .foot-grid { display: grid; grid-template-columns: 1fr auto; gap: 32px; align-items: center; }
  @media (max-width: 720px) { .foot-grid { grid-template-columns: 1fr; } }
  .foot-links { display: flex; flex-wrap: wrap; gap: 10px 24px; margin-top: 14px; font-size: 13.5px; }
  .qr-row { display: flex; gap: 18px; }
  .qr { text-align: center; }
  .qr img { width: 96px; height: 96px; border-radius: 8px; border: 1px solid rgba(105,245,230,.3); background: #fff; padding: 4px; }
  .qr span { display: block; margin-top: 8px; font: 650 10.5px/1.4 var(--mono); color: var(--muted); }
  .foot-fine { margin-top: 30px; color: var(--muted); font-size: 12px; line-height: 1.7; }

  /* ===== entrance reveal（渐进增强：无 JS 时全部可见）===== */
  body.fx-on .fx { opacity: 0; transform: translateY(24px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
  body.fx-on .fx.in { opacity: 1; transform: none; }
  @media (prefers-reduced-motion: reduce) { body.fx-on .fx { opacity: 1; transform: none; transition: none; } }