/* ===== 设计令牌：白蓝配色 + 玻璃质感统一变量（改配色从这里改） ===== */
    :root {
      --blue: #1274ED;
      --blue-deep: #0a5fc2;
      --blue-ink: #0a4fae;
      --blue-mid: #3b8bff;
      --blue-soft: #7db8ff;
      --ice: #3db8ff;
      --ice-bright: #6fd2ff;
      --ice-mist: rgba(61, 184, 255, 0.16);
      --ink: #0b1c2c;
      --ink-soft: #46607a;
      --line: rgba(18, 96, 170, 0.14);
      --bg: #eef6fc;
      --font-display: "Unbounded", "Chakra Petch", sans-serif;
      --font-tech: "Chakra Petch", "Unbounded", sans-serif;
      --font-cn: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
      --nav-h: 64px;
      --r-lg: 28px;
      --r-md: 20px;
      --shadow-sm: 0 8px 24px rgba(18, 96, 170, 0.10);
      --shadow: 0 24px 60px rgba(18, 96, 170, 0.16);
      --shadow-lg: 0 40px 90px rgba(18, 96, 170, 0.22);
    }

    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; overflow-x: hidden; overflow-x: clip; }
    body {
      font-family: var(--font-cn);
      color: var(--ink);
      background: var(--bg);
      line-height: 1.65;
      overflow-x: hidden;
      overflow-x: clip;
      overscroll-behavior-x: none;
      -webkit-font-smoothing: antialiased;
      text-rendering: optimizeLegibility;
    }
    a { color: inherit; text-decoration: none; }
    img { max-width: 100%; display: block; }
    button { font: inherit; border: 0; cursor: pointer; background: none; color: inherit; }
    ul { list-style: none; }
    .container { width: min(1200px, calc(100% - 40px)); margin-inline: auto; }

    /* ================= Ambient liquid backdrop ================= */
    .backdrop { position: fixed; inset: 0; z-index: -3; overflow: hidden; background: linear-gradient(180deg, #d9ebf9 0%, #eaf4fc 36%, #f6fbfe 70%, #eef6fc 100%); }
    /* 液态光斑：靠 border-radius 与 transform 的 morph 关键帧持续变形，模拟液体流动 */
    .blob { position: absolute; border-radius: 50%; filter: blur(60px); opacity: .72; will-change: transform; }
    .blob-1 { width: 50vw; height: 50vw; left: -12vw; top: -16vw; background: radial-gradient(circle at 35% 35%, rgba(111, 210, 255, 0.85), rgba(61, 184, 255, 0.10) 62%, transparent 74%); animation: morph 24s ease-in-out infinite; }
    .blob-2 { width: 42vw; height: 42vw; right: -13vw; top: 6vw; background: radial-gradient(circle at 60% 40%, rgba(59, 139, 255, 0.68), rgba(18, 116, 237, 0.10) 60%, transparent 76%); animation: morph 30s ease-in-out infinite reverse; }
    .blob-3 { width: 44vw; height: 44vw; left: 24vw; bottom: -20vw; background: radial-gradient(circle at 50% 50%, rgba(125, 184, 255, 0.58), rgba(125, 184, 255, 0.08) 58%, transparent 74%); animation: morph 26s ease-in-out infinite; }
    /* 仅位移+缩放（走 GPU 合成），去掉 border-radius 动画，避免每帧重绘大 blur 光斑导致卡顿 */
    @keyframes morph {
      0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
      33% { transform: translate3d(2vw, -2vw, 0) scale(1.06); }
      66% { transform: translate3d(-1.5vw, 2vw, 0) scale(0.98); }
    }
    .grid-overlay {
      position: fixed; inset: 0; z-index: -2; pointer-events: none;
      background-image:
        linear-gradient(rgba(61, 184, 255, 0.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(61, 184, 255, 0.06) 1px, transparent 1px);
      background-size: 58px 58px;
      -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 12%, #000 16%, transparent 78%);
      mask-image: radial-gradient(ellipse 80% 60% at 50% 12%, #000 16%, transparent 78%);
    }
    .noise {
      position: fixed; inset: 0; z-index: -1; pointer-events: none; opacity: .033;
      background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 250 250' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
    }
    .scroll-progress { position: fixed; top: 0; left: 0; height: 3px; width: 0; z-index: 400; background: linear-gradient(90deg, var(--ice-bright), var(--blue)); box-shadow: 0 0 12px rgba(61, 184, 255, 0.7); }

    /* ================= Liquid glass primitives ================= */
    /*
      液态玻璃核心（三层结构）：
      ① 本体：半透明白色渐变 + backdrop-filter 毛玻璃模糊
      ② ::before：鼠标跟随高光，--mx/--my 由 JS 写入，光斑随光标流动
      ③ ::after：固定顶部高光 + 斜向反光，模拟玻璃折射
    */
    .glass {
      position: relative;
      background: linear-gradient(140deg, rgba(255, 255, 255, 0.74), rgba(255, 255, 255, 0.36));
      -webkit-backdrop-filter: blur(14px) saturate(140%);
      backdrop-filter: blur(14px) saturate(140%);
      border: 1px solid rgba(255, 255, 255, 0.72);
      box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.9), inset 0 -1px 0 rgba(255, 255, 255, 0.22), 0 18px 44px rgba(18, 96, 170, 0.12);
      overflow: hidden;
    }
    .glass::before {
      content: ""; position: absolute; inset: 0; border-radius: inherit; pointer-events: none;
      background: radial-gradient(420px circle at var(--mx, 50%) var(--my, 50%), rgba(255, 255, 255, 0.62), transparent 60%);
      opacity: 0; transition: opacity .35s ease; z-index: 1;
    }
    .glass:hover::before { opacity: 1; }
    .glass::after {
      content: ""; position: absolute; inset: 0; border-radius: inherit; pointer-events: none;
      background:
        radial-gradient(120% 60% at 8% -8%, rgba(255, 255, 255, 0.6), transparent 42%),
        linear-gradient(115deg, transparent 30%, rgba(255, 255, 255, 0.34) 46%, rgba(125, 184, 255, 0.16) 55%, transparent 74%);
      opacity: .55; z-index: 1;
    }
    .glass > * { position: relative; z-index: 2; }

    .gauge-ring { position: absolute; inset: 0; pointer-events: none; }
    .gauge-ring svg { width: 100%; height: 100%; animation: spin 46s linear infinite; }
    @keyframes spin { to { transform: rotate(360deg); } }

    /* ================= Floating pill nav ================= */
    .nav {
      position: fixed; top: 16px; left: 16px; right: 16px; z-index: 300;
      max-width: 1160px; margin-inline: auto; height: var(--nav-h);
      display: flex; align-items: center; justify-content: space-between; gap: 18px;
      padding: 0 12px 0 20px; border-radius: 999px;
      background: rgba(255, 255, 255, 0.5);
      -webkit-backdrop-filter: blur(18px) saturate(150%);
      backdrop-filter: blur(18px) saturate(150%);
      border: 1px solid rgba(255, 255, 255, 0.7);
      box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.85), 0 8px 30px rgba(18, 96, 170, 0.10);
      transition: box-shadow .35s, background .35s, border-color .35s;
    }
    .nav.is-scrolled { background: rgba(255, 255, 255, 0.72); border-color: rgba(255, 255, 255, 0.9); box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.9), 0 16px 44px rgba(18, 96, 170, 0.16); }
    .brand { display: flex; align-items: center; gap: 12px; min-width: 0; }
    .brand img { width: 42px; height: 42px; border-radius: 13px; box-shadow: 0 6px 18px rgba(18, 116, 237, 0.32), inset 0 1px 0 rgba(255, 255, 255, .6); }
    .brand-text { display: flex; flex-direction: column; line-height: 1.15; }
    .brand-text strong { font-size: 1.02rem; font-weight: 800; letter-spacing: .02em; }
    .brand-text span { font-family: var(--font-tech); font-size: .62rem; color: var(--ink-soft); letter-spacing: .16em; text-transform: uppercase; }
    .nav-links { display: flex; align-items: center; gap: 26px; font-size: .9rem; color: var(--ink-soft); font-weight: 500; }
    .nav-links a { position: relative; padding: 4px 0; transition: color .2s; }
    .nav-links a::after { content: ""; position: absolute; left: 50%; bottom: -3px; width: 0; height: 2px; border-radius: 2px; background: linear-gradient(90deg, var(--ice), var(--blue)); transform: translateX(-50%); transition: width .28s; }
    .nav-links a:hover { color: var(--blue-deep); }
    .nav-links a:hover::after { width: 100%; }

    .btn {
      position: relative; display: inline-flex; align-items: center; justify-content: center; gap: 9px;
      height: 48px; padding: 0 24px; border-radius: 999px; font-weight: 700; font-size: .93rem;
      transition: transform .25s, box-shadow .25s, filter .25s, background .25s;
      white-space: nowrap; cursor: pointer; overflow: hidden; isolation: isolate;
    }
    .btn:hover { transform: translateY(-2px); }
    .btn:active { transform: translateY(0); }
    .btn-primary {
      color: #fff;
      background: linear-gradient(135deg, var(--blue-mid) 0%, var(--blue) 48%, var(--blue-deep) 100%);
      box-shadow: 0 12px 30px rgba(18, 116, 237, 0.38), inset 0 1px 0 rgba(255, 255, 255, .35);
    }
    .btn-primary::before { content: ""; position: absolute; top: -40%; bottom: -40%; left: -60%; width: 45%; background: linear-gradient(105deg, transparent, rgba(255, 255, 255, 0.6) 50%, transparent); transform: translateX(-140%) rotate(8deg); transition: transform .9s; z-index: -1; }
    .btn-primary:hover { box-shadow: 0 18px 40px rgba(18, 116, 237, 0.5); filter: brightness(1.04); }
    .btn-primary:hover::before { transform: translateX(340%) rotate(8deg); }
    .btn-ghost { color: var(--ink); background: rgba(255, 255, 255, 0.5); border: 1px solid rgba(59, 139, 255, 0.34); -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px); box-shadow: inset 0 1px 0 rgba(255, 255, 255, .7); }
    .btn-ghost:hover { background: rgba(255, 255, 255, 0.85); border-color: rgba(18, 116, 237, 0.5); }
    .btn-nav { height: 42px; padding: 0 18px; font-size: .88rem; }
    .btn-icon svg { width: 18px; height: 18px; }

    .nav-toggle { display: none; width: 44px; height: 44px; border-radius: 50%; border: 1px solid var(--line); background: rgba(255, 255, 255, .6); align-items: center; justify-content: center; flex-direction: column; gap: 5px; }
    .nav-toggle span { display: block; width: 18px; height: 2px; background: var(--ink); border-radius: 2px; transition: transform .3s, opacity .3s; }
    .nav-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
    .nav-toggle.is-open span:nth-child(2) { opacity: 0; }
    .nav-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

    /* ================= Hero ================= */
    .hero { position: relative; padding: calc(var(--nav-h) + 96px) 0 60px; overflow: hidden; }
    .hero-grid { display: grid; grid-template-columns: 1.04fr .96fr; gap: 44px; align-items: center; }
    .hero-copy { position: relative; z-index: 2; min-width: 0; }
    .eyebrow { display: inline-flex; align-items: center; gap: 10px; font-family: var(--font-tech); font-size: .72rem; font-weight: 700; letter-spacing: .18em; text-transform: uppercase; color: var(--blue-deep); margin-bottom: 20px; }
    .eyebrow::before { content: ""; width: 26px; height: 2px; border-radius: 2px; background: linear-gradient(90deg, var(--ice), var(--blue)); }
    .hero h1 { font-size: clamp(2rem, 4.6vw, 3.15rem); font-weight: 900; line-height: 1.18; letter-spacing: .01em; margin-bottom: 18px; }
    .hero h1 em { font-style: normal; background: linear-gradient(115deg, var(--blue) 0%, var(--ice) 50%, var(--blue-deep) 100%); -webkit-background-clip: text; background-clip: text; color: transparent; background-size: 200% 100%; animation: shimmer 6s ease-in-out infinite; white-space: nowrap; }
    @keyframes shimmer { 0%, 100% { background-position: 0% 50%; } 50% { background-position: 100% 50%; } }
    .hero-desc { font-size: 1.06rem; color: var(--ink-soft); margin-bottom: 28px; max-width: 52ch; }
    .hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 26px; }
    .hero-meta { display: flex; flex-wrap: wrap; gap: 10px 20px; font-size: .86rem; color: var(--ink-soft); }
    .hero-meta span { display: inline-flex; align-items: center; gap: 7px; }
    .hero-meta i { width: 7px; height: 7px; border-radius: 50%; background: var(--ice); box-shadow: 0 0 0 4px var(--ice-mist); }

    .stat-pills { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 26px; }
    .stat-pill { display: inline-flex; flex-direction: column; align-items: center; justify-content: center; gap: 1px; min-width: 76px; padding: 13px 15px; border-radius: 17px; background: rgba(255, 255, 255, .55); border: 1px solid rgba(255, 255, 255, .82); -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px); box-shadow: inset 0 1px 0 rgba(255, 255, 255, .95), 0 10px 26px rgba(18, 96, 170, .12); }
    .stat-pill b { font-family: var(--font-display); font-size: 1.1rem; font-weight: 700; line-height: 1; background: linear-gradient(135deg, var(--blue), var(--ice)); -webkit-background-clip: text; background-clip: text; color: transparent; }
    .stat-pill small { font-size: .64rem; color: var(--ink-soft); font-weight: 600; letter-spacing: .06em; }

    /* hero device "instrument viewport" */
    .hero-visual { position: relative; display: flex; align-items: center; justify-content: center; min-height: 520px; }
    .hero-visual .halo { position: absolute; width: 460px; height: 460px; border-radius: 50%; background: radial-gradient(circle, rgba(61, 184, 255, 0.34), transparent 66%); filter: blur(30px); animation: pulse 7s ease-in-out infinite; }
    @keyframes pulse { 0%, 100% { transform: scale(1); opacity: .8; } 50% { transform: scale(1.08); opacity: 1; } }
    .frame { position: relative; width: min(340px, 60vw); aspect-ratio: 17 / 28; border-radius: 36px; padding: 22px; background: rgba(255, 255, 255, 0.4); border: 1px solid rgba(255, 255, 255, 0.75); -webkit-backdrop-filter: blur(12px) saturate(150%); backdrop-filter: blur(12px) saturate(150%); box-shadow: inset 0 1px 0 rgba(255,255,255,.85), 0 40px 90px rgba(18, 96, 170, 0.28); z-index: 2; }
    .frame .corner { position: absolute; width: 34px; height: 34px; border: 2px solid var(--blue); opacity: .85; }
    .frame .corner.tl { top: 10px; left: 10px; border-right: 0; border-bottom: 0; border-radius: 12px 0 0 0; }
    .frame .corner.tr { top: 10px; right: 10px; border-left: 0; border-bottom: 0; border-radius: 0 12px 0 0; }
    .frame .corner.bl { bottom: 10px; left: 10px; border-right: 0; border-top: 0; border-radius: 0 0 0 12px; }
    .frame .corner.br { bottom: 10px; right: 10px; border-left: 0; border-top: 0; border-radius: 0 0 12px 0; }
    .frame .screen { width: 100%; height: 100%; border-radius: 24px; overflow: hidden; position: relative; box-shadow: 0 14px 34px rgba(8, 30, 55, 0.3); }
    .frame .screen img { width: 100%; height: 100%; object-fit: cover; object-position: top center; }
    .frame .scanline { position: absolute; left: 0; right: 0; height: 90px; top: -30%; background: linear-gradient(180deg, transparent, rgba(111, 210, 255, 0.5), transparent); animation: scan 4.6s linear infinite; pointer-events: none; z-index: 3; }
    @keyframes scan { 0% { top: -30%; } 100% { top: 120%; } }
    .frame .readout { position: absolute; left: 12px; bottom: 12px; right: 12px; display: flex; justify-content: space-between; align-items: center; padding: 9px 13px; border-radius: 12px; background: rgba(11, 28, 44, 0.72); color: #cfeaff; font-family: var(--font-tech); font-size: .62rem; letter-spacing: .1em; z-index: 3; -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px); }
    .frame .readout b { color: #fff; font-weight: 600; }

    .float-chip { position: absolute; z-index: 3; padding: 11px 15px; border-radius: 15px; background: rgba(255, 255, 255, .74); -webkit-backdrop-filter: blur(14px) saturate(160%); backdrop-filter: blur(14px) saturate(160%); border: 1px solid rgba(255, 255, 255, .88); box-shadow: inset 0 1px 0 rgba(255, 255, 255, .95), 0 16px 38px rgba(18, 96, 160, .18); font-family: var(--font-tech); font-weight: 700; font-size: .8rem; color: var(--blue-deep); letter-spacing: .03em; animation: floatY 5s ease-in-out infinite; }
    .float-chip small { display: block; font-family: var(--font-cn); font-weight: 500; font-size: .68rem; color: var(--ink-soft); letter-spacing: 0; margin-top: 2px; }
    .chip-1 { top: 8%; right: -2%; animation-delay: .2s; }
    .chip-2 { bottom: 16%; left: -4%; animation-delay: 1.1s; }
    .chip-3 { top: 40%; left: -6%; animation-delay: .7s; }
    @keyframes floatY { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-12px); } }

    .hero-giant { position: absolute; z-index: 0; font-family: var(--font-display); font-weight: 800; font-size: clamp(11rem, 30vw, 24rem); line-height: 1; color: transparent; -webkit-text-stroke: 1px rgba(18, 116, 237, 0.10); right: -2%; bottom: -4%; pointer-events: none; user-select: none; }

    /* entrance animations */
    .rise { opacity: 0; transform: translateY(30px); animation: rise .9s cubic-bezier(.2,.7,.2,1) forwards; }
    .rise-1 { animation-delay: .05s; } .rise-2 { animation-delay: .15s; } .rise-3 { animation-delay: .25s; } .rise-4 { animation-delay: .35s; } .rise-5 { animation-delay: .45s; } .rise-6 { animation-delay: .55s; }
    @keyframes rise { to { opacity: 1; transform: none; } }

    /* ================= Marquee ================= */
    .marquee-band { position: relative; padding: 16px 0; border-top: 1px solid rgba(255, 255, 255, .6); border-bottom: 1px solid rgba(255, 255, 255, .6); background: linear-gradient(90deg, rgba(255, 255, 255, .3), rgba(255, 255, 255, .58), rgba(255, 255, 255, .3)); -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px); overflow: hidden; transform: rotate(-1.1deg) scale(1.02); }
    .marquee { display: flex; width: max-content; animation: marquee 32s linear infinite; }
    .marquee-band:hover .marquee { animation-play-state: paused; }
    .marquee-track { display: flex; align-items: center; gap: 34px; padding-right: 34px; white-space: nowrap; }
    .marquee-track span { font-family: var(--font-tech); font-size: .9rem; font-weight: 600; letter-spacing: .08em; color: var(--ink-soft); display: inline-flex; align-items: center; gap: 34px; }
    .marquee-track span::after { content: "◆"; font-size: .5rem; color: var(--ice); opacity: .7; }
    @keyframes marquee { to { transform: translateX(-50%); } }

    /* ================= Sections ================= */
    section { padding: 96px 0; position: relative; }
    .section-head { max-width: 700px; margin-bottom: 46px; }
    .section-head.center { margin-inline: auto; text-align: center; }
    .section-head .eyebrow { margin-bottom: 14px; }
    .section-head.center .eyebrow { justify-content: center; }
    .section-head h2 { font-size: clamp(1.6rem, 3.1vw, 2.2rem); font-weight: 800; line-height: 1.22; margin-bottom: 13px; letter-spacing: .01em; }
    .section-head p { color: var(--ink-soft); font-size: 1.02rem; }

    /* 滑动入场动画：.slide-l 左滑入 / .slide-r 右滑入 / .slide-u 自下上移。
       由 IntersectionObserver 添加 .is-in 触发过渡（见文末 JS）。 */
    .slide-l { opacity: 0; transform: translateX(-46px); }
    .slide-r { opacity: 0; transform: translateX(46px); }
    .slide-u { opacity: 0; transform: translateY(40px); }
    .slide-l.is-in, .slide-r.is-in, .slide-u.is-in { opacity: 1; transform: none; transition: opacity .85s cubic-bezier(.2,.7,.2,1), transform .85s cubic-bezier(.2,.7,.2,1); }

    /* ================= Features carousel ================= */
    #features { overflow: hidden; }
    .carousel { position: relative; margin: 0 -20px; padding: 8px 20px 22px; }
    .carousel::before, .carousel::after { content: ""; position: absolute; top: 0; bottom: 22px; width: 56px; z-index: 3; pointer-events: none; }
    .carousel::before { left: 0; background: linear-gradient(90deg, var(--bg), transparent); }
    .carousel::after { right: 0; background: linear-gradient(270deg, var(--bg), transparent); }
    /* 横向滑动容器：scroll-snap 吸顶 + 原生惯性滚动，JS 额外支持鼠标拖拽 */
    .carousel-track { display: flex; gap: 20px; overflow-x: auto; overflow-y: hidden; scroll-snap-type: x proximity; scroll-behavior: smooth; padding: 4px 4px 6px; -webkit-overflow-scrolling: touch; scrollbar-width: thin; scrollbar-color: rgba(59, 139, 255, .45) transparent; cursor: grab; }
    .carousel-track.dragging { cursor: grabbing; scroll-snap-type: none; }
    .carousel-track::-webkit-scrollbar { height: 7px; }
    .carousel-track::-webkit-scrollbar-track { background: transparent; }
    .carousel-track::-webkit-scrollbar-thumb { background: rgba(59, 139, 255, .4); border-radius: 999px; }
    .feature-card { flex: 0 0 288px; width: 288px; scroll-snap-align: start; border-radius: var(--r-md); padding: 26px 24px; display: flex; flex-direction: column; transition: transform .35s, box-shadow .35s; }
    .feature-card:hover { transform: translateY(-6px); box-shadow: inset 0 1px 0 rgba(255,255,255,.95), 0 28px 60px rgba(18, 96, 170, .18); }
    .feature-num { font-family: var(--font-display); font-size: .72rem; font-weight: 700; letter-spacing: .12em; color: var(--blue-deep); margin-bottom: 14px; }
    .feature-icon { width: 50px; height: 50px; border-radius: 14px; display: grid; place-items: center; margin-bottom: 16px; background: linear-gradient(135deg, rgba(111, 210, 255, .92), rgba(18, 116, 237, .86)); color: #fff; box-shadow: 0 10px 22px rgba(18, 116, 237, .3), inset 0 1px 0 rgba(255, 255, 255, .5); }
    .feature-icon svg { width: 24px; height: 24px; }
    .feature-card h3 { font-size: 1.14rem; font-weight: 800; margin-bottom: 8px; letter-spacing: .01em; }
    .feature-card p { color: var(--ink-soft); font-size: .9rem; line-height: 1.62; }
    .carousel-controls { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-top: 8px; }
    .rail-btns { display: flex; gap: 8px; }
    .rail-btn { width: 46px; height: 46px; border-radius: 50%; display: grid; place-items: center; background: rgba(255, 255, 255, .6); border: 1px solid rgba(255, 255, 255, .8); color: var(--blue-deep); -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px); box-shadow: 0 8px 20px rgba(18, 96, 160, .1); transition: background .2s, opacity .2s, transform .2s; }
    .rail-btn:hover:not(:disabled) { background: #fff; transform: translateY(-2px); }
    .rail-btn:disabled { opacity: .35; cursor: default; }
    .rail-btn svg { width: 19px; height: 19px; }
    .carousel-hint { font-family: var(--font-tech); font-size: .72rem; letter-spacing: .1em; color: var(--ink-soft); opacity: .7; }

    /* ================= Spec sheet ================= */
    .spec-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
    .spec { border-radius: var(--r-md); padding: 22px 24px; display: flex; align-items: center; gap: 16px; transition: transform .3s, box-shadow .3s; }
    .spec:hover { transform: translateY(-4px); box-shadow: inset 0 1px 0 rgba(255,255,255,.95), 0 22px 48px rgba(18, 96, 170, .16); }
    .spec-key { flex-shrink: 0; min-width: 76px; padding: 8px 12px; border-radius: 11px; text-align: center; font-family: var(--font-tech); font-size: .68rem; font-weight: 700; letter-spacing: .06em; color: var(--blue-deep); background: rgba(61, 184, 255, .12); }
    .spec-val { font-size: .96rem; font-weight: 600; color: var(--ink); line-height: 1.5; }


    /* ================= Steps ================= */
    .steps-wrap { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
    .step { border-radius: var(--r-md); padding: 30px 26px; text-align: center; transition: transform .3s, box-shadow .3s; }
    .step:hover { transform: translateY(-5px); box-shadow: inset 0 1px 0 rgba(255,255,255,.95), 0 24px 52px rgba(18, 96, 170, .16); }
    .step-index { width: 62px; height: 62px; margin: 0 auto 18px; display: grid; place-items: center; border-radius: 50%; font-family: var(--font-display); font-weight: 700; font-size: 1.1rem; color: #fff; background: linear-gradient(135deg, var(--blue-mid), var(--blue-deep)); box-shadow: 0 12px 26px rgba(18, 116, 237, .32), inset 0 1px 0 rgba(255, 255, 255, .4); position: relative; }
    .step-index::after { content: ""; position: absolute; inset: -7px; border-radius: 50%; border: 1px dashed rgba(18, 116, 237, .4); animation: spin 18s linear infinite; }
    .step h3 { font-size: 1.16rem; font-weight: 800; margin-bottom: 9px; }
    .step p { color: var(--ink-soft); font-size: .93rem; }

    /* ================= Games ================= */
    .games-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .game-card { display: flex; align-items: center; gap: 16px; padding: 22px 24px; border-radius: var(--r-md); transition: transform .3s, box-shadow .3s; }
    .game-card:hover { transform: translateY(-5px); box-shadow: inset 0 1px 0 rgba(255,255,255,.95), 0 22px 48px rgba(18, 96, 170, .16); }
    .game-icon { width: 54px; height: 54px; flex-shrink: 0; border-radius: 15px; display: grid; place-items: center; font-size: 1.35rem; font-weight: 900; color: #fff; background: linear-gradient(135deg, var(--blue-mid), var(--blue)); box-shadow: 0 10px 22px rgba(18, 116, 237, .26), inset 0 1px 0 rgba(255, 255, 255, .45); }
    .game-icon.game-icon-img { background: #fff; padding: 9px; box-shadow: 0 10px 22px rgba(18, 116, 237, .16), inset 0 0 0 1px rgba(18, 116, 237, .12); }
    .game-icon.game-icon-img img { width: 100%; height: 100%; object-fit: contain; }
    .game-card h3 { font-size: 1.08rem; font-weight: 800; margin-bottom: 3px; }
    .game-card p { font-size: .85rem; color: var(--ink-soft); }

    /* ================= Trust banner ================= */
    .trust-banner { display: grid; grid-template-columns: 1.25fr .75fr; gap: 40px; align-items: center; padding: 52px 56px; border-radius: 32px; background: radial-gradient(ellipse 55% 90% at 100% 0%, rgba(125, 210, 255, .42), transparent 55%), radial-gradient(ellipse 45% 80% at 0% 100%, rgba(59, 139, 255, .3), transparent 60%), linear-gradient(135deg, #0c2740 0%, #14324e 50%, #144a6e 100%); color: #e9f5fd; box-shadow: 0 34px 80px rgba(14, 36, 56, .3); overflow: hidden; position: relative; }
    .trust-banner::after { content: ""; position: absolute; width: 340px; height: 340px; right: -70px; bottom: -90px; border-radius: 50%; background: radial-gradient(circle, rgba(61, 184, 255, .32), transparent 70%); pointer-events: none; }
    .trust-banner h2 { font-size: clamp(1.5rem, 2.8vw, 2rem); font-weight: 800; margin-bottom: 12px; line-height: 1.28; }
    .trust-banner > div > p { color: rgba(233, 245, 253, .78); margin-bottom: 24px; max-width: 48ch; }
    .trust-points { display: grid; gap: 12px; margin-bottom: 28px; }
    .trust-points span { display: flex; align-items: center; gap: 10px; font-size: .95rem; color: rgba(233, 245, 253, .92); }
    .trust-points span::before { content: ""; width: 8px; height: 8px; border-radius: 2px; background: var(--ice-bright); transform: rotate(45deg); box-shadow: 0 0 10px rgba(111, 210, 255, .8); }
    .trust-aside { text-align: center; padding: 30px 24px; border-radius: 22px; background: rgba(255, 255, 255, .08); border: 1px solid rgba(255, 255, 255, .16); -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px); box-shadow: inset 0 1px 0 rgba(255, 255, 255, .2); position: relative; z-index: 1; }
    .trust-aside .domain { font-family: var(--font-tech); font-size: .78rem; letter-spacing: .08em; color: var(--ice-bright); margin-bottom: 10px; word-break: break-all; }
    .trust-aside strong { display: block; font-size: 1.4rem; margin-bottom: 8px; }
    .trust-aside p { font-size: .88rem; margin-bottom: 20px; color: rgba(233, 245, 253, .72); }
    .slogan { margin-top: 18px; font-size: .92rem; color: rgba(233, 245, 253, .66); font-style: italic; }

    /* ================= FAQ ================= */
    .faq-list { display: grid; gap: 14px; max-width: 880px; }
    details.faq-item {
      border-radius: var(--r-md); padding: 6px 24px; overflow: hidden;
      background: rgba(255, 255, 255, .52); border: 1px solid rgba(255, 255, 255, .7);
      -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
      box-shadow: 0 8px 24px rgba(18, 96, 170, .06);
      transition: box-shadow .35s ease, transform .35s ease, border-color .35s ease, background .35s ease;
    }
    details.faq-item:hover { transform: translateY(-2px); box-shadow: 0 14px 34px rgba(18, 96, 170, .10); }
    details.faq-item[open] {
      box-shadow: 0 18px 44px rgba(18, 96, 170, .12);
      border-color: rgba(59, 139, 255, .32);
      background: rgba(255, 255, 255, .72);
    }
    details.faq-item summary {
      list-style: none; cursor: pointer; display: flex; justify-content: space-between; align-items: center;
      gap: 16px; padding: 16px 0; font-weight: 700; font-size: 1.04rem;
      transition: color .3s, transform .15s ease;
      user-select: none; -webkit-tap-highlight-color: transparent;
    }
    details.faq-item summary:hover { color: var(--blue-deep); }
    details.faq-item summary:active { transform: scale(.985); color: var(--blue-deep); }
    details.faq-item summary::-webkit-details-marker { display: none; }
    details.faq-item summary::after {
      content: "+"; flex: none; width: 30px; height: 30px; display: grid; place-items: center; border-radius: 50%;
      font-size: 1.3rem; font-weight: 500; color: var(--blue-deep); background: rgba(61, 184, 255, .12);
      transition: transform .45s cubic-bezier(.2,.7,.2,1), background .45s, color .45s;
    }
    details.faq-item[open] summary::after { content: "–"; transform: rotate(180deg); background: linear-gradient(135deg, var(--blue-mid), var(--blue-deep)); color: #fff; }
    /* 展开动画：用 max-height 过渡，兼容性最好，所有浏览器都能平滑展开收起 */
    .faq-body { overflow: hidden; max-height: 0; transition: max-height .5s cubic-bezier(.22,.61,.36,1); }
    details.faq-item[open] .faq-body { max-height: 520px; }
    .faq-body-inner p {
      color: var(--ink-soft); padding: 0 0 18px; max-width: 74ch;
      opacity: 0; transform: translateY(-8px);
      transition: opacity .45s ease .12s, transform .45s ease .12s;
    }
    details.faq-item[open] .faq-body-inner p { opacity: 1; transform: none; }

    .final-cta { text-align: center; padding-bottom: 110px; }
    .final-cta h2 { font-size: clamp(1.55rem, 3.2vw, 2.1rem); font-weight: 800; margin-bottom: 12px; }
    .final-cta p { color: var(--ink-soft); margin-bottom: 30px; }
    .final-cta .btn { min-width: 210px; }

    /* ================= Footer ================= */
    .footer { border-top: 1px solid rgba(255, 255, 255, .65); padding: 42px 0 52px; background: rgba(255, 255, 255, .35); -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px); }
    .footer-inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 24px; align-items: flex-start; }
    .footer-brand { display: flex; gap: 12px; align-items: center; }
    .footer-brand img { width: 42px; height: 42px; border-radius: 12px; }
    .footer-brand strong { display: block; font-size: .98rem; }
    .footer-brand span { font-size: .82rem; color: var(--ink-soft); }
    .footer-links { display: flex; flex-wrap: wrap; gap: 8px 22px; }
    .footer-links a { font-size: .9rem; color: var(--ink-soft); transition: color .2s; }
    .footer-links a:hover { color: var(--blue-deep); }
    .footer-note { max-width: 520px; font-size: .82rem; color: var(--ink-soft); line-height: 1.7; }
    .footer-copy { width: 100%; margin-top: 8px; padding-top: 20px; border-top: 1px solid rgba(18, 96, 170, .1); font-size: .8rem; color: var(--ink-soft); display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; }

    .back-top { position: fixed; right: 24px; bottom: 24px; z-index: 280; width: 48px; height: 48px; border-radius: 50%; background: rgba(255, 255, 255, .72); border: 1px solid rgba(255, 255, 255, .85); color: var(--blue-deep); -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px); box-shadow: 0 12px 30px rgba(18, 96, 170, .18); display: grid; place-items: center; opacity: 0; transform: translateY(14px); pointer-events: none; transition: opacity .3s, transform .3s; }
    .back-top.is-show { opacity: 1; transform: none; pointer-events: auto; }
    .back-top svg { width: 20px; height: 20px; }

    .mobile-panel { display: none; position: fixed; top: calc(var(--nav-h) + 24px); left: 16px; right: 16px; z-index: 290; background: rgba(255, 255, 255, .88); -webkit-backdrop-filter: blur(24px) saturate(180%); backdrop-filter: blur(24px) saturate(180%); border: 1px solid rgba(255, 255, 255, .7); border-radius: 24px; padding: 14px 22px 22px; flex-direction: column; gap: 2px; box-shadow: 0 24px 60px rgba(18, 96, 170, .16); }
    .mobile-panel.is-open { display: flex; }
    .mobile-panel a { font-size: 1.02rem; font-weight: 600; padding: 12px 4px; border-bottom: 1px solid rgba(18, 96, 170, .08); }
    .mobile-panel .btn { margin-top: 16px; width: 100%; }

    @media (max-width: 980px) {
      /* 移动端进一步降低毛玻璃强度，减少滚动卡顿 */
      .glass { -webkit-backdrop-filter: blur(9px) saturate(120%); backdrop-filter: blur(9px) saturate(120%); }
      .nav { -webkit-backdrop-filter: blur(13px) saturate(135%); backdrop-filter: blur(13px) saturate(135%); }
      .nav-links { display: none; }
      .nav .btn-nav { display: none; }
      .nav-toggle { display: flex; }
      .hero-grid, .trust-banner { grid-template-columns: 1fr; }
      .hero { padding-top: calc(var(--nav-h) + 56px); }
      .hero-visual { order: -1; min-height: 460px; }
      .hero-giant { font-size: 12rem; }
      .spec-wrap { grid-template-columns: 1fr; }
      .steps-wrap, .games-grid { grid-template-columns: 1fr; }
      .trust-banner { padding: 40px 30px; }
      .chip-3 { display: none; }
    }
    @media (max-width: 560px) {
      .container { width: calc(100% - 28px); }
      .nav { left: 10px; right: 10px; top: 10px; padding: 0 8px 0 14px; }
      .hero-visual { min-height: 360px; }
      .frame { padding: 14px; }
      .hero-cta { flex-direction: column; align-items: stretch; }
      .stat-pill { min-width: 66px; padding: 11px 12px; }
      .chip-1 { right: 0; top: 3%; }
      .chip-2 { left: 0; bottom: 8%; }
      .float-chip { padding: 9px 12px; font-size: .72rem; }
      .spec { padding: 18px; }
      .hero-cta .btn { width: 100%; }
      .feature-card { flex-basis: 252px; width: 252px; }
      section { padding: 72px 0; }
      .trust-banner { padding: 32px 22px; }
      .carousel { margin: 0 -14px; padding: 8px 14px 20px; }
    }
    @media (max-width: 380px) {
      .brand img { width: 36px; height: 36px; border-radius: 11px; }
      .brand-text strong { font-size: .95rem; }
      .brand-text span { display: none; }
      .hero h1 { font-size: 1.7rem; }
      .hero-desc { font-size: .95rem; }
      .stat-pill { min-width: 60px; padding: 10px 11px; }
      .stat-pill b { font-size: .95rem; }
      .frame { border-radius: 28px; }
      .section-head h2 { font-size: 1.5rem; }
      .btn { padding: 0 20px; }
    }
    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after { animation: none !important; transition: none !important; }
      .rise, .slide-l, .slide-r, .slide-u { opacity: 1; transform: none; }
      .marquee { animation: none; }
    }

    /* ---------- Hero 吉祥物视觉 ---------- */
    .hero-mascot { position: relative; z-index: 2; width: min(480px, 84vw); animation: floatY 7s ease-in-out infinite; }
    .hero-mascot img { width: 100%; display: block; filter: drop-shadow(0 30px 42px rgba(18,96,170,.3)); }

    /* ---------- 渠道区四列网格（PC 4 列 / 平板 2 列 / 手机 1 列） ---------- */
    .games-grid.games-grid-4 { grid-template-columns: repeat(4, 1fr); }
    @media (max-width: 980px) {
      .games-grid.games-grid-4 { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 560px) {
      .games-grid.games-grid-4 { grid-template-columns: 1fr; }
    }