:root {
    --bg: #07061a;
    --ink: #f4f2ff;
    --ink-2: rgba(236, 232, 255, .74);
    --ink-3: rgba(236, 232, 255, .52);
    --line: rgba(255, 255, 255, .16);
    --accent: #8fb4ff;
    --grad: linear-gradient(90deg, #6aa8ff, #b78bff);
    --ok: #4ade80;
    --bad: #ff6b81;
    --cjk: "PingFang SC", "Source Han Sans SC", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
    --latin: "SF Pro Display", -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
    --wrap: 1180px;
    --r: 24px;
  }
  * { box-sizing: border-box; }
  html { scroll-behavior: smooth; scroll-padding-top: 80px; }
  body { margin: 0; background: var(--bg); color: var(--ink); font: 400 16px/1.6 var(--latin), var(--cjk);
         -webkit-font-smoothing: antialiased; overflow-x: hidden; }
  a { color: inherit; text-decoration: none; }
  img, video { display: block; max-width: 100%; }
  button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
  svg.i { width: 1em; height: 1em; stroke: currentColor; fill: none; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; flex-shrink: 0; }

  /* ---------- background ---------- */
  #aurora { position: fixed; inset: 0; width: 100vw; height: 100vh; z-index: -2; }
  .grain { position: fixed; inset: 0; z-index: -1; opacity: .06; mix-blend-mode: overlay; pointer-events: none;
           background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='220' height='220' filter='url(%23n)'/%3E%3C/svg%3E"); }

  /* ---------- glass ---------- */
  .glass { background: linear-gradient(140deg, rgba(255,255,255,.16), rgba(255,255,255,.05) 55%, rgba(255,255,255,.09));
           backdrop-filter: blur(28px) saturate(160%); -webkit-backdrop-filter: blur(28px) saturate(160%);
           border: 1px solid rgba(255,255,255,.22); border-radius: var(--r);
           box-shadow: inset 0 1px 0 rgba(255,255,255,.4), 0 30px 80px rgba(8,4,40,.35); }

  .wrap { width: min(var(--wrap), calc(100% - 48px)); margin: 0 auto; }
  section { padding: 120px 0; position: relative; }
  .kicker { font: 500 15px/1 var(--latin); letter-spacing: .06em; color: var(--accent); }
  .h2 { margin: 16px 0 0; font: 800 44px/1.2 var(--cjk); letter-spacing: .01em; }
  .lead { margin: 16px 0 0; font: 400 18px/1.7 var(--cjk); color: var(--ink-2); }
  .center { text-align: center; }
  .center .lead { max-width: 640px; margin-left: auto; margin-right: auto; }

  .btn { display: inline-flex; align-items: center; justify-content: center; gap: 10px; height: 52px; padding: 0 26px;
         border-radius: 999px; font: 600 16px/1 var(--cjk); white-space: nowrap; transition: transform .2s, box-shadow .2s, background .2s; }
  .btn svg.i { width: 19px; height: 19px; }
  .btn.primary { background: #fff; color: #120f33; box-shadow: 0 10px 30px rgba(120,140,255,.35); }
  .btn.primary:hover { transform: translateY(-1px); box-shadow: 0 14px 40px rgba(140,150,255,.5); }
  .btn.ghost { border: 1px solid rgba(255,255,255,.3); background: rgba(255,255,255,.07); }
  .btn.ghost:hover { background: rgba(255,255,255,.14); }
  .btn.sm { height: 38px; padding: 0 16px; font-size: 14px; gap: 7px; }
  .btn.sm svg.i { width: 16px; height: 16px; }

  /* ---------- header ---------- */
  header { position: fixed; top: 0; left: 0; right: 0; z-index: 50; transition: background .3s, border-color .3s; border-bottom: 1px solid transparent; }
  header.scrolled { background: rgba(10,8,34,.55); backdrop-filter: blur(24px) saturate(160%); -webkit-backdrop-filter: blur(24px) saturate(160%); border-color: rgba(255,255,255,.1); }
  .nav { height: 68px; display: flex; align-items: center; gap: 36px; }
  .brand { display: flex; align-items: center; gap: 10px; font: 700 17px/1 var(--cjk); }
  .brand img { width: 30px; height: 30px; }
  .brand .en { font: 300 17px/1 var(--latin); color: var(--ink-2); }
  .links { display: flex; gap: 28px; font: 500 14px/1 var(--cjk); color: var(--ink-2); }
  .links a:hover { color: var(--ink); }
  .nav-r { margin-left: auto; display: flex; align-items: center; gap: 10px; }
  .lang { position: relative; }
  .menu { position: absolute; right: 0; top: 46px; min-width: 180px; padding: 6px; display: none; border-radius: 14px;
          background: rgba(22,18,58,.92); backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px);
          border: 1px solid rgba(255,255,255,.16); box-shadow: 0 20px 50px rgba(0,0,0,.4); }
  .menu.open { display: block; }
  .menu a, .menu span { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-radius: 9px; font: 500 14px/1 var(--cjk); }
  .menu a:hover { background: rgba(255,255,255,.08); }
  .menu .off { color: var(--ink-3); }
  .menu .off small { margin-left: auto; font-size: 12px; }
  .menu svg.i { width: 15px; height: 15px; }

  /* ---------- hero ---------- */
  .hero { padding: 150px 0 90px; min-height: 100vh; display: flex; flex-direction: column; justify-content: center; }
  .hero-grid { display: grid; grid-template-columns: 480px 1fr; gap: 64px; align-items: center; }
  .chip { display: inline-flex; align-items: center; gap: 8px; padding: 8px 16px; border-radius: 999px;
          border: 1px solid rgba(255,255,255,.28); background: rgba(255,255,255,.07); font: 500 14px/1 var(--cjk); color: var(--ink-2); }
  .chip svg.i { width: 15px; height: 15px; }
  .hero h1 { margin: 26px 0 0; font: 900 68px/1.14 var(--cjk); letter-spacing: .02em; }
  .hero h1 .g { background: linear-gradient(90deg, #b9cfff, #e3c8ff 60%, #ffd1f1); -webkit-background-clip: text; background-clip: text; color: transparent; }
  .hero .lead { font-size: 19px; }
  .cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 36px; }
  .req { margin-top: 18px; font: 400 14px/1 var(--cjk); color: var(--ink-3); }
  .player { position: relative; padding: 12px; border-radius: 28px; }
  .player video { width: 100%; aspect-ratio: 16 / 9; border-radius: 18px; background: #0b0a24; object-fit: cover; }
  .player .play { position: absolute; right: 30px; bottom: 30px; }
  .trust { display: flex; justify-content: center; flex-wrap: wrap; gap: 14px 40px; margin-top: 72px; font: 400 14px/1 var(--cjk); color: var(--ink-3); }
  .trust span { display: inline-flex; align-items: center; gap: 8px; }
  .trust svg.i { width: 16px; height: 16px; color: var(--accent); }

  /* ---------- compare ---------- */
  .cmp-grid { display: grid; grid-template-columns: 1fr 520px; gap: 72px; align-items: center; }
  .tabs { display: inline-flex; padding: 5px; border-radius: 999px; gap: 4px; margin-top: 34px; }
  .tabs button { padding: 10px 20px; border-radius: 999px; font: 500 15px/1 var(--cjk); color: var(--ink-2); }
  .tabs button.on { background: rgba(255,255,255,.92); color: #120f33; }
  .steps { list-style: none; padding: 0; margin: 34px 0 0; display: grid; gap: 22px; }
  .steps li { display: flex; gap: 18px; align-items: flex-start; }
  .steps .n { width: 40px; height: 40px; border-radius: 50%; display: grid; place-items: center; flex-shrink: 0;
              font: 600 16px/1 var(--latin); border: 1px solid rgba(255,255,255,.3); background: rgba(255,255,255,.06); }
  .steps b { display: block; font: 600 17px/1.4 var(--cjk); }
  .steps small { display: block; margin-top: 4px; font: 400 15px/1.5 var(--cjk); color: var(--ink-3); }
  .ba { padding: 12px; border-radius: 26px; }
  .ba-pg { position: relative; aspect-ratio: 1572 / 2223; border-radius: 10px; overflow: hidden; user-select: none; touch-action: pan-y; cursor: ew-resize; background: #fff; }
  .ba-pg img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; pointer-events: none; }
  .ba-pg .zh { clip-path: inset(0 0 0 var(--x, 50%)); }
  .ba-line { position: absolute; top: 0; bottom: 0; left: var(--x, 50%); width: 2px; margin-left: -1px; background: #fff; box-shadow: 0 0 12px rgba(120,150,255,.9); }
  .ba-knob { position: absolute; top: 50%; left: var(--x, 50%); width: 46px; height: 46px; margin: -23px 0 0 -23px; border-radius: 50%;
             display: grid; place-items: center; color: #120f33; background: rgba(255,255,255,.95); box-shadow: 0 6px 20px rgba(10,6,40,.4); }
  .ba-knob svg.i { width: 20px; height: 20px; }
  .ba-tag { position: absolute; bottom: 14px; padding: 6px 12px; border-radius: 8px; font: 500 13px/1 var(--cjk); color: #fff; background: rgba(10,8,40,.6); backdrop-filter: blur(8px); }
  .ba-tag.l { left: 14px; } .ba-tag.r { right: 14px; }
  .ba-note { position: absolute; top: 14px; right: 14px; padding: 6px 12px; border-radius: 8px; font: 500 12px/1 var(--cjk); letter-spacing: .1em;
             color: rgba(255,255,255,.9); background: rgba(10,8,40,.55); border: 1px solid rgba(255,255,255,.25); }
  .hint { margin-top: 14px; text-align: center; font: 400 14px/1 var(--cjk); color: var(--ink-3); }

  /* ---------- features ---------- */
  .grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 56px; }
  .feat { overflow: hidden; display: flex; flex-direction: column; transition: transform .3s, border-color .3s; }
  .feat:hover { transform: translateY(-4px); border-color: rgba(255,255,255,.34); }
  .viz { height: 200px; position: relative; overflow: hidden; border-bottom: 1px solid rgba(255,255,255,.12);
         background: radial-gradient(120% 90% at 30% 0%, rgba(140,160,255,.22), rgba(255,255,255,0) 70%); }
  .viz .shot { position: absolute; left: 22px; top: 24px; width: 520px; max-width: none; border-radius: 10px; box-shadow: 0 16px 40px rgba(0,0,0,.4); }
  .feat .txt { padding: 24px 26px 28px; }
  .feat h3 { margin: 0; display: flex; align-items: center; gap: 10px; font: 700 19px/1.3 var(--cjk); }
  .feat h3 svg.i { width: 20px; height: 20px; color: var(--accent); }
  .feat p { margin: 10px 0 0; font: 400 15px/1.65 var(--cjk); color: var(--ink-2); }
  /* mini illustrations */
  .drop { position: absolute; inset: 26px 26px 26px; border: 2px dashed rgba(255,255,255,.35); border-radius: 16px; display: flex; align-items: center; padding-left: 26px;
          font: 500 14px/1.6 var(--cjk); color: var(--ink-3); }
  .pg { position: absolute; width: 74px; height: 105px; border-radius: 6px; overflow: hidden; background: #fff; box-shadow: 0 12px 26px rgba(0,0,0,.45); border: 1px solid rgba(255,255,255,.6); }
  .pg img { width: 100%; height: 100%; object-fit: cover; }
  .pills { position: absolute; inset: 0; display: flex; flex-direction: column; justify-content: center; gap: 14px; padding: 0 26px; }
  .pill { display: flex; align-items: center; gap: 12px; padding: 14px 16px; border-radius: 16px; background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.18); }
  .pill .ic { width: 36px; height: 36px; border-radius: 10px; display: grid; place-items: center; background: rgba(255,255,255,.12); }
  .pill b { display: block; font: 600 15px/1.2 var(--latin), var(--cjk); }
  .pill small { display: block; margin-top: 3px; font: 400 12px/1.3 var(--latin), var(--cjk); color: var(--ink-3); }
  .rows { position: absolute; inset: 22px 22px; display: flex; flex-direction: column; gap: 8px; }
  .r { display: flex; align-items: center; gap: 12px; height: 44px; padding: 0 14px; border-radius: 12px; background: rgba(255,255,255,.06); font: 500 13px/1 var(--latin), var(--cjk); }
  .r .nm { width: 64px; }
  .r .st { flex: 1; color: var(--ink-3); white-space: nowrap; }
  .r .tag { padding: 5px 10px; border-radius: 999px; font: 600 12px/1 var(--cjk); background: rgba(74,222,128,.16); color: var(--ok); }
  .r.bad { background: rgba(255,107,129,.1); border: 1px solid rgba(255,107,129,.4); }
  .r.bad .st { color: var(--bad); }
  .r .rt { width: 30px; height: 30px; border-radius: 50%; display: grid; place-items: center; border: 1px solid rgba(255,255,255,.35); }
  .r .rt svg.i { width: 15px; height: 15px; }
  .r .th { width: 26px; height: 34px; border-radius: 4px; overflow: hidden; background: #fff; flex-shrink: 0; }
  .r .th img { width: 100%; height: 100%; object-fit: cover; }

  /* ---------- tech ---------- */
  .tech { padding: 30px 30px 32px; }
  .tech .ti { width: 54px; height: 54px; border-radius: 16px; display: grid; place-items: center;
              background: linear-gradient(140deg, rgba(143,180,255,.3), rgba(183,139,255,.18)); border: 1px solid rgba(255,255,255,.24); }
  .tech .ti svg.i { width: 24px; height: 24px; }
  .tech h3 { margin: 24px 0 0; font: 700 20px/1.3 var(--cjk); }
  .tech p { margin: 10px 0 0; font: 400 15px/1.7 var(--cjk); color: var(--ink-2); }

  /* ---------- ways ---------- */
  .ways { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 56px; }
  .way { padding: 40px 40px 36px; }
  .way .tag { font: 500 14px/1 var(--latin); letter-spacing: .05em; color: var(--accent); }
  .way h3 { margin: 14px 0 0; font: 800 34px/1.2 var(--cjk); }
  .way .who { margin-top: 10px; font: 500 16px/1.5 var(--latin), var(--cjk); color: var(--ink-2); }
  .way ul { list-style: none; padding: 0; margin: 26px 0 0; display: grid; gap: 14px; }
  .way li { display: flex; gap: 12px; font: 400 16px/1.5 var(--cjk); }
  .way li svg.i { width: 20px; height: 20px; margin-top: 2px; color: var(--ok); }
  .way .note { margin-top: 22px; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.12); font: 400 14px/1.5 var(--cjk); color: var(--ink-3); }
  .start { margin-top: 90px; }
  .start h3 { margin: 0; text-align: center; font: 800 28px/1.3 var(--cjk); }
  .start ol { list-style: none; padding: 0; margin: 36px 0 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; counter-reset: s; }
  .start li { padding: 26px 28px; display: flex; gap: 16px; align-items: flex-start; }
  .start .n { width: 40px; height: 40px; border-radius: 50%; display: grid; place-items: center; flex-shrink: 0; font: 700 16px/1 var(--latin); color: #120f33; background: #fff; }
  .start b { display: block; font: 600 17px/1.4 var(--cjk); }
  .start small { display: block; margin-top: 4px; font: 400 14px/1.5 var(--cjk); color: var(--ink-3); }

  /* ---------- faq ---------- */
  .faq { max-width: 820px; margin: 56px auto 0; padding: 8px 32px; }
  details { border-bottom: 1px solid rgba(255,255,255,.12); }
  details:last-child { border-bottom: 0; }
  summary { list-style: none; cursor: pointer; display: flex; align-items: center; gap: 16px; padding: 24px 0; font: 600 17px/1.4 var(--cjk); }
  summary::-webkit-details-marker { display: none; }
  summary svg.i { margin-left: auto; width: 20px; height: 20px; color: var(--ink-3); transition: transform .25s; }
  details[open] summary svg.i { transform: rotate(45deg); }
  details p { margin: -8px 0 24px; font: 400 15px/1.75 var(--cjk); color: var(--ink-2); }

  .band { margin-top: 110px; padding: 64px 40px; text-align: center; border-radius: 32px; position: relative; overflow: hidden; }
  .band img.app { width: 88px; height: 88px; margin: 0 auto; }
  .band h2 { margin: 22px 0 0; font: 800 36px/1.3 var(--cjk); }
  .band .cta { justify-content: center; margin-top: 28px; }

  footer { padding: 40px 0 56px; border-top: 1px solid rgba(255,255,255,.1); font: 400 13px/1.8 var(--cjk); color: var(--ink-3); }
  .foot { display: flex; align-items: center; gap: 24px; flex-wrap: wrap; }
  .foot .brand { font-size: 15px; color: var(--ink); }
  .foot .brand img { width: 24px; height: 24px; }
  .foot nav { margin-left: auto; display: flex; gap: 22px; flex-wrap: wrap; }
  .foot nav a:hover, .mail:hover { color: var(--ink); }
  .mail { display: inline-flex; align-items: center; gap: 6px; color: var(--ink-2); }
  .mail svg.i { width: 15px; height: 15px; }
  .credits { margin-top: 22px; }

  /* ---------- modals ---------- */
  .modal { position: fixed; inset: 0; z-index: 100; display: none; align-items: center; justify-content: center; padding: 24px;
           background: rgba(4,3,18,.6); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); }
  .modal.open { display: flex; animation: fade .25s ease; }
  .dlg { position: relative; width: min(560px, 100%); padding: 34px 34px 28px; border-radius: 26px;
         background: rgba(24,20,62,.85); border: 1px solid rgba(255,255,255,.18); box-shadow: 0 40px 100px rgba(0,0,0,.5); }
  .dlg.wide { width: min(1100px, 100%); padding: 14px; background: rgba(12,10,36,.9); }
  .dlg.wide video { width: 100%; aspect-ratio: 16 / 9; border-radius: 16px; background: #000; }
  .x { position: absolute; top: 14px; right: 14px; width: 36px; height: 36px; border-radius: 50%; display: grid; place-items: center; background: rgba(255,255,255,.1); }
  .dlg.wide .x { top: -48px; right: 0; }
  .x svg.i { width: 18px; height: 18px; }
  .dlg h3 { margin: 0; padding-right: 40px; font: 700 22px/1.35 var(--cjk); }
  .dlg p { margin: 10px 0 0; font: 400 15px/1.7 var(--cjk); color: var(--ink-2); }
  .dlg p a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
  .dlg ol { list-style: none; padding: 0; margin: 24px 0 0; display: grid; gap: 16px; }
  .dlg li { display: flex; gap: 14px; align-items: flex-start; }
  .dlg li .n { width: 30px; height: 30px; border-radius: 50%; display: grid; place-items: center; flex-shrink: 0; font: 700 14px/1 var(--latin); color: #120f33; background: #fff; }
  .dlg li b { display: block; font: 600 16px/1.4 var(--cjk); }
  .dlg li small { display: block; font: 400 14px/1.5 var(--cjk); color: var(--ink-3); }
  .dlg .acts { display: flex; justify-content: flex-end; gap: 10px; margin-top: 28px; }
  .copy { display: flex; align-items: center; gap: 10px; margin-top: 20px; padding: 0 8px 0 16px; height: 48px; border-radius: 12px;
          background: rgba(255,255,255,.07); border: 1px solid rgba(255,255,255,.16); font: 400 14px/1 var(--latin); color: var(--ink-2); }
  .copy span { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .toast { position: fixed; left: 50%; bottom: 32px; z-index: 120; transform: translate(-50%, 20px); opacity: 0; pointer-events: none;
           padding: 12px 20px; border-radius: 12px; background: rgba(255,255,255,.95); color: #120f33; font: 500 14px/1 var(--cjk); transition: .3s; }
  .toast.show { opacity: 1; transform: translate(-50%, 0); }
  @keyframes fade { from { opacity: 0 } }

  /* ---------- reveal ---------- */
  .js .rv { opacity: 0; transform: translateY(28px); transition: opacity .8s ease, transform .8s cubic-bezier(.2,.7,.2,1); }
  .js .rv.in { opacity: 1; transform: none; }

  /* ---------- responsive ---------- */
  @media (max-width: 1080px) {
    .hero-grid, .cmp-grid { grid-template-columns: 1fr; gap: 48px; }
    .hero { min-height: 0; }
    .hero-text { max-width: 620px; }
    .ba { max-width: 520px; width: 100%; margin: 0 auto; }
    .grid3 { grid-template-columns: repeat(2, 1fr); }
    .links { display: none; }
  }
  @media (max-width: 720px) {
    section { padding: 84px 0; }
    .hero { padding: 120px 0 64px; }
    .hero h1 { font-size: 46px; }
    .h2 { font-size: 32px; }
    .lead, .hero .lead { font-size: 16px; }
    .grid3, .ways, .start ol { grid-template-columns: 1fr; }
    .way { padding: 30px 26px; }
    .way h3 { font-size: 28px; }
    .faq { padding: 4px 22px; }
    .band { padding: 48px 22px; }
    .band h2 { font-size: 26px; }
    .brand .en, .nav .dl-txt { display: none; }
    .cta .btn { flex: 1; }
    .trust { margin-top: 48px; justify-content: flex-start; }
    .player .play { right: 20px; bottom: 20px; }
    .foot nav { margin-left: 0; }
  }
  @media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    .js .rv { opacity: 1; transform: none; transition: none; }
  }
  .credit { margin-top: 6px; text-align: center; font: 400 12px/1.4 var(--cjk); color: var(--ink-3); opacity: .8; }
  html[lang="en"] body { font-family: var(--latin), var(--cjk); }
  html[lang="en"] { --cjk: "SF Pro Display", -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", sans-serif; }
  html[lang="en"] .hero h1 { font-size: 58px; font-weight: 800; letter-spacing: -.01em; line-height: 1.08; }
  @media (max-width: 720px) { html[lang="en"] .hero h1 { font-size: 42px; } }