/* ===== 全站共享样式（原 index.html 内联 <style>，逐字搬出） ===== */
        :root {
            --text-primary: #1d1d1f;
            --text-secondary: #6e6e73;
            --text-tertiary: #6e6e73;
            --bg-white: #ffffff;
            --bg-light: #f5f5f7;
            --bg-dark: #000000;
            --border-light: rgba(0,0,0,0.08);
            --accent-blue: #0066cc;
            --accent-gold: #d4a017;
            --nav-bg: rgba(0,0,0,0.86);
            --section-pad: 96px;
            --section-pad-mobile: 64px;
            --max-width: 1200px;
            --transition-smooth: cubic-bezier(0.4, 0, 0.2, 1);
        }

        * { margin: 0; padding: 0; box-sizing: border-box; }
        [hidden] { display: none !important; }
        ::selection { background: #cde6ff; color: #102338; }
        input { caret-color: var(--accent-blue); }
        table, .about-stat-number, .exhibition-countdown { font-variant-numeric: tabular-nums; }
        a { text-underline-offset: 4px; }
        summary:focus-visible { outline: 2px solid var(--accent-blue); outline-offset: 4px; }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            -webkit-tap-highlight-color: transparent;
        }
        .nav-logo, .footer-logo { -webkit-user-select: none; user-select: none; }
        @media (prefers-reduced-motion: reduce) {
            html { scroll-behavior: auto; }
            *, *::before, *::after {
                animation-duration: 0.01ms !important;
                animation-delay: -1ms !important;
                animation-iteration-count: 1 !important;
                transition-duration: 0.01ms !important;
                transition-delay: 0s !important;
            }
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
            color: var(--text-primary);
            background: var(--bg-white);
            line-height: 1.5;
            overflow-x: hidden;
            letter-spacing: -0.015em;
        }

        .skip-link {
            position: absolute;
            top: -40px;
            left: 0;
            background: #000;
            color: #fff;
            padding: 8px 16px;
            z-index: 10000;
            font-size: 14px;
            text-decoration: none;
            transition: top 0.3s;
        }
        .skip-link:focus { top: 0; }

        a:focus-visible, button:focus-visible {
            outline: 2px solid var(--accent-blue);
            outline-offset: 2px;
        }
        .nav-links a:focus-visible, .nav-cta:focus-visible, .footer-links a:focus-visible {
            outline: 2px solid #fff;
            outline-offset: 2px;
        }
        .cta-primary:focus-visible { outline: 2px solid #fff; outline-offset: 4px; }
        .cta-secondary:focus-visible { outline: 2px solid #8cc9ff; outline-offset: 4px; }

        /* ===== NAV ===== */
        .nav {
            position: fixed;
            top: 0; left: 0; right: 0;
            z-index: 1000;
            height: 76px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--nav-bg);
            backdrop-filter: saturate(180%) blur(20px);
            -webkit-backdrop-filter: saturate(180%) blur(20px);
            transition: background 0.3s ease;
            padding: 0 env(safe-area-inset-right) 0 env(safe-area-inset-left);
        }
        .nav.menu-open {
            background: #000000;
            backdrop-filter: none;
            -webkit-backdrop-filter: none;
        }

        .nav-inner {
            width: 100%;
            max-width: var(--max-width);
            padding: 0 48px;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: 8px;
            text-decoration: none;
            color: #f5f5f7;
            font-weight: 600;
            font-size: 15px;
            letter-spacing: -0.01em;
            transition: opacity 0.3s;
        }
        .nav-logo:hover { opacity: 0.8; }
        .nav-logo svg { width: 64px; height: auto; color: #f5f5f7; }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 32px;
            list-style: none;
        }
        .nav-links a {
            color: rgba(245,245,247,0.8);
            text-decoration: none;
            font-size: 14px;
            font-weight: 400;
            letter-spacing: 0.01em;
            transition: color 0.3s;
            position: relative;
            padding: 4px 0;
        }
        .nav-badge {
            display: inline-block;
            margin-left: 7px;
            padding: 1px 8px;
            font-size: 10px;
            font-weight: 600;
            line-height: 1.6;
            color: #ffb500;
            background: rgba(255,181,0,0.12);
            border: 1px solid rgba(255,181,0,0.35);
            border-radius: 999px;
            vertical-align: 2px;
            letter-spacing: 0.03em;
            white-space: nowrap;
        }
        .nav-links a:hover, .nav-links a.active { color: #fff; }
        .nav-links a.active::after {
            content: '';
            position: absolute;
            bottom: -2px; left: 0; right: 0;
            height: 1px;
            background: #fff;
        }

        .nav-cta {
            color: #f5f5f7;
            font-size: 14px;
            font-weight: 400;
            text-decoration: none;
            padding: 8px 20px;
            border: 1px solid rgba(245,245,247,0.3);
            border-radius: 20px;
            transition: all 0.3s;
            min-height: 44px;
            display: inline-flex;
            align-items: center;
            box-sizing: border-box;
            letter-spacing: 0.01em;
        }
        .nav-cta:hover { background: rgba(245,245,247,0.1); border-color: rgba(245,245,247,0.5); }

        /* 产品下拉菜单 */
        .nav-links li.has-sub { position: relative; display: flex; align-items: center; }
        .nav-links li.has-sub > a { display: inline-flex; align-items: center; gap: 5px; }
        .nav-product-toggle {
            position: relative; flex: 0 0 28px;
            display: inline-flex; align-items: center; justify-content: center;
            width: 28px; height: 44px; padding: 0; border: 0; border-radius: 6px;
            background: transparent; color: rgba(245,245,247,0.8); cursor: pointer;
            transition: background-color 140ms ease, color 140ms ease;
        }
        .nav-product-toggle[hidden] { display: none; }
        .nav-product-toggle:hover { background: rgba(255,255,255,0.08); color: #fff; }
        .nav-product-toggle .caret {
            width: 8px; height: 8px;
            border-right: 1.5px solid currentColor;
            border-bottom: 1.5px solid currentColor;
            transform: rotate(45deg) translateY(-2px);
            transition: transform 0.25s;
            opacity: 0.7;
        }
        .nav-product-toggle[aria-expanded="true"] .caret { transform: rotate(225deg) translateY(-1px); }
        .nav-sub {
            position: absolute;
            top: 100%; left: 50%;
            margin-top: 14px;
            transform: translateX(-50%) translateY(8px);
            min-width: 230px;
            list-style: none;
            background: rgba(16,16,18,0.98);
            backdrop-filter: saturate(180%) blur(20px);
            -webkit-backdrop-filter: saturate(180%) blur(20px);
            border: 1px solid rgba(255,255,255,0.1);
            border-radius: 14px;
            padding: 8px;
            box-shadow: 0 16px 40px rgba(0,0,0,0.4);
            opacity: 0;
            visibility: hidden;
            transition: opacity 0.25s var(--transition-smooth), transform 0.25s var(--transition-smooth), visibility 0.25s;
        }
        /* 将列表上方的间隙纳入悬停区域，覆盖从箭头斜向移入的完整路径。 */
        .nav-sub::before {
            content: '';
            position: absolute;
            bottom: 100%; left: -1px; right: -1px; height: 15px;
        }
        .nav-links li.has-sub:not(.nav-enhanced):hover .nav-sub,
        .nav-links li.has-sub:not(.nav-enhanced):focus-within .nav-sub,
        .nav-links li.has-sub.is-expanded .nav-sub {
            opacity: 1;
            visibility: visible;
            transform: translateX(-50%) translateY(0);
        }
        .nav-sub a {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            padding: 9px 14px;
            border-radius: 8px;
            color: rgba(245,245,247,0.8);
            font-size: 13px;
            letter-spacing: 0;
            white-space: nowrap;
        }
        .nav-sub a small { color: rgba(245,245,247,0.55); font-size: 11px; font-weight: 400; }
        .nav-sub a:hover { background: rgba(255,255,255,0.08); color: #fff; }
        .nav-sub a:hover small { color: rgba(245,245,247,0.75); }
        /* 当前页面常驻选中态，与临时 hover / 键盘焦点分开。内描边不改变菜单尺寸。 */
        .nav-sub a[aria-current="page"] {
            color: #ffcd52;
            background: rgba(255,181,0,0.09);
            box-shadow: inset 0 0 0 1px rgba(255,181,0,0.75);
        }
        .nav-sub a[aria-current="page"] small { color: rgba(255,205,82,0.8); }
        .nav-sub a::after { display: none; }

        .hamburger {
            display: none;
            width: 44px; height: 44px;
            background: none;
            border: none;
            cursor: pointer;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 5px;
            padding: 0;
        }
        .hamburger span {
            display: block;
            width: 18px; height: 1.5px;
            background: #f5f5f7;
            transition: all 0.3s var(--transition-smooth);
            border-radius: 1px;
        }
        .hamburger.active span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
        .hamburger.active span:nth-child(2) { opacity: 0; }
        .hamburger.active span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

        /* ===== HERO ===== */
        .hero {
            position: relative;
            min-height: 100vh;
            min-height: 100dvh;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            background:
                radial-gradient(ellipse 62% 75% at 82% 24%, rgba(17, 60, 99, 0.48), transparent 72%),
                radial-gradient(ellipse 55% 65% at 9% 82%, rgba(49, 43, 40, 0.25), transparent 72%),
                radial-gradient(ellipse 75% 80% at 50% 45%, #101e32, #03070d 78%);
            overflow: hidden;
            padding: 100px 24px 60px;
        }

        .hero-particles {
            position: absolute;
            inset: 0;
            z-index: 1;
            display: block;
            width: 100%;
            height: 100%;
            pointer-events: none;
        }

        .hero-content {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 800px;
            width: 100%;
            will-change: transform, opacity;
            text-shadow: 0 2px 24px rgba(0, 0, 0, 0.55);
        }
        .hero-content .cta-primary, .hero-content .cta-secondary { text-shadow: none; }

        .hero-label {
            font-size: 12px;
            font-weight: 500;
            color: #b0b0b0;
            text-transform: uppercase;
            letter-spacing: 0.12em;
            margin-bottom: 20px;
            animation: heroArrive 480ms cubic-bezier(.16,1,.3,1) both;
        }

        .hero h1 {
            font-size: clamp(40px, 6vw, 72px);
            font-weight: 700;
            line-height: 1.1;
            color: #f5f5f7;
            margin-bottom: 16px;
            letter-spacing: -0.03em;
            animation: heroArrive 560ms cubic-bezier(.16,1,.3,1) both;
        }
        .hero h1 span { color: #fff; }

        .hero-slogan {
            font-size: clamp(18px, 2.5vw, 28px);
            font-weight: 400;
            color: #b0b0b0;
            margin-bottom: 8px;
            letter-spacing: -0.01em;
            animation: heroArrive 480ms cubic-bezier(.16,1,.3,1) both;
        }

        .hero-en {
            font-size: 13px;
            font-weight: 400;
            color: #9a9a9a;
            letter-spacing: 0.15em;
            text-transform: uppercase;
            margin-bottom: 32px;
            animation: heroArrive 480ms cubic-bezier(.16,1,.3,1) both;
        }

        .hero-desc {
            font-size: 17px;
            font-weight: 400;
            color: #bfbfbf;
            line-height: 1.7;
            max-width: 560px;
            margin: 0 auto 40px;
            animation: heroArrive 520ms cubic-bezier(.16,1,.3,1) both;
        }

        .hero-cta-group {
            display: flex;
            gap: 20px;
            justify-content: center;
            flex-wrap: wrap;
            animation: heroArrive 400ms cubic-bezier(.16,1,.3,1) both;
        }

        .cta-primary {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: #f5f5f7;
            color: #000;
            padding: 12px 28px;
            border-radius: 100px;
            font-size: 14px;
            font-weight: 500;
            text-decoration: none;
            transition: all 0.3s var(--transition-smooth);
            letter-spacing: -0.01em;
            will-change: transform;
        }
        .cta-primary:hover { background: #fff; transform: translateY(-1px); }
        .cta-primary svg { width: 14px; height: 14px; }

        .cta-secondary {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: #8cc9ff;
            font-size: 14px;
            font-weight: 400;
            text-decoration: none;
            transition: all 0.3s;
            letter-spacing: -0.01em;
            min-height: 44px;
        }
        .cta-secondary:hover { text-decoration: underline; }
        .cta-secondary svg { width: 12px; height: 12px; }

        .hero-scroll {
            position: absolute;
            z-index: 2;
            bottom: 24px;
            left: calc(50% - 22px);
            width: 44px;
            min-height: 44px;
            text-decoration: none;
            justify-content: center;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 8px;
            cursor: pointer;
            opacity: 0;
            animation: fadeUp 400ms cubic-bezier(.16,1,.3,1) 200ms forwards;
            will-change: transform, opacity;
        }
        .hero-scroll span {
            display: none;
        }
        .hero-scroll svg {
            width: 16px; height: 16px;
            color: #c5d6e8;
            animation: bounce 2s infinite ease-in-out;
        }

        /* All first-screen content is visible from first paint; motion never gates a link. */
        @keyframes heroArrive {
            from { transform: translateY(8px); }
            to { transform: translateY(0); }
        }
        @keyframes fadeUp {
            to { opacity: 1; transform: translateY(0); }
        }
        @keyframes bounce {
            0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
            40% { transform: translateY(-6px); }
            60% { transform: translateY(-3px); }
        }

        /* ===== SECTIONS ===== */
        section {
            position: relative;
            scroll-margin-top: 92px;
            padding: var(--section-pad) 24px;
            padding-left: max(24px, env(safe-area-inset-left));
            padding-right: max(24px, env(safe-area-inset-right));
        }
        .section-inner {
            max-width: var(--max-width);
            margin: 0 auto;
        }
        .section-label {
            font-size: 12px;
            font-weight: 500;
            color: var(--accent-blue);
            text-transform: uppercase;
            letter-spacing: 0.15em;
            margin-bottom: 12px;
            display: block;
        }
        .section-title {
            font-size: clamp(32px, 4.5vw, 48px);
            font-weight: 700;
            line-height: 1.1;
            letter-spacing: -0.03em;
            margin-bottom: 16px;
            color: var(--text-primary);
        }
        .section-subtitle {
            font-size: 19px;
            font-weight: 400;
            color: var(--text-secondary);
            line-height: 1.5;
            max-width: 600px;
        }
        .section-header { margin-bottom: 40px; }
        .section-header.center { text-align: center; }
        .section-header.center .section-subtitle { margin: 0 auto; }

        /* ===== SCROLL ANIMATIONS ===== */
        .reveal { opacity: 1; transform: none; }
        .reveal.visible {
            opacity: 1;
            transform: translateY(0);
        }
        .reveal-delay-1 { transition-delay: 0.1s; }
        .reveal-delay-2 { transition-delay: 0.2s; }
        .reveal-delay-3 { transition-delay: 0.3s; }
        .reveal-delay-4 { transition-delay: 0.4s; }

        @media (prefers-reduced-motion: reduce) {
            .reveal { opacity: 1; transform: none; transition: none; }
        }

        /* ===== FEATURES ===== */
        .features { background: var(--bg-light); padding-top: 72px; padding-bottom: 72px; }
        .features .section-title { font-size: clamp(28px, 3.5vw, 36px); }
        .features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px 32px; }
        .feature-card { display: grid; grid-template-columns: 36px minmax(0, 1fr); gap: 6px 14px; align-content: start; padding: 20px 0; border-top: 1px solid #d8d8de; }
        .feature-icon { width: 36px; height: 36px; display: flex; align-items: center; justify-content: center; grid-row: 1 / 3; color: var(--accent-blue); }
        .feature-icon svg { width: 24px; height: 24px; }
        .feature-card h3 { font-size: 18px; font-weight: 600; letter-spacing: -0.02em; }
        .feature-card p { font-size: 15px; color: var(--text-secondary); line-height: 1.7; grid-column: 2; }

        /* ===== EXHIBITION ===== */
        .exhibition {
            --section-pad: 112px;
            --section-pad-mobile: 64px;
            --ex-gold: #ffc45c;
            --ex-muted: #aeb6c4;
            background: #080e18;
            color: #f5f5f7;
            scroll-margin-top: 76px;
        }
        .exhibition-head-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px 24px;
            padding-bottom: 22px;
            margin-bottom: 36px;
            border-bottom: 1px solid rgba(255,255,255,0.16);
        }
        .exhibition-badge {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: 14px;
            font-weight: 600;
            color: var(--ex-gold);
            letter-spacing: 0.06em;
        }
        .exhibition-badge::before {
            content: '';
            width: 7px;
            height: 7px;
            border-radius: 50%;
            background: currentColor;
        }
        .exhibition-countdown {
            font-size: 14px;
            line-height: 1.5;
            color: var(--ex-gold);
        }
        .exhibition-overview {
            display: grid;
            grid-template-columns: minmax(0, 1fr) 280px;
            grid-template-areas: 'title visit' 'details visit';
            gap: 32px 64px;
            margin-bottom: 40px;
        }
        .exhibition-title-text { grid-area: title; min-width: 0; }
        .exhibition-title-text h2 {
            max-width: 12em;
            font-size: clamp(36px, 3.8vw, 54px);
            font-weight: 650;
            line-height: 1.22;
            letter-spacing: -0.04em;
            text-wrap: balance;
        }
        .exhibition-name-en {
            margin-top: 18px;
            font-size: 16px;
            line-height: 1.4;
            letter-spacing: 0.04em;
            color: #e0e4eb;
        }
        .exhibition-subtitle {
            margin-top: 9px;
            font-size: 15px;
            line-height: 1.65;
            color: var(--ex-muted);
            text-wrap: pretty;
        }
        .exhibition-details {
            grid-area: details;
            display: grid;
            grid-template-columns: 1fr 1.2fr;
            gap: 24px;
            padding-top: 24px;
            border-top: 1px solid rgba(255,255,255,0.12);
        }
        .exhibition-detail { min-width: 0; }
        .exhibition-detail dt,
        .exhibition-booth-label {
            font-size: 13px;
            font-weight: 400;
            line-height: 1.5;
            color: var(--ex-muted);
            margin-bottom: 10px;
        }
        .exhibition-detail dd {
            font-size: 18px;
            font-weight: 500;
            line-height: 1.65;
            text-wrap: pretty;
        }
        .exhibition-halls {
            display: block;
            margin-top: 4px;
            color: var(--ex-muted);
            font-size: 13px;
            font-weight: 400;
        }
        .exhibition-visit {
            grid-area: visit;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            padding-left: 40px;
            border-left: 1px solid rgba(255,255,255,0.16);
        }
        .exhibition-booth-number {
            color: var(--ex-gold);
            font-size: 64px;
            font-weight: 600;
            letter-spacing: -0.05em;
            line-height: 1.1;
            font-variant-numeric: tabular-nums;
        }
        .exhibition-booth-hall {
            margin-top: 8px;
            font-size: 16px;
            color: #e0e4eb;
        }
        .exhibition-cta-group {
            display: grid;
            gap: 10px;
            margin-top: 28px;
        }
        .exhibition-cta,
        .exhibition-ghost {
            display: inline-flex;
            justify-content: center;
            align-items: center;
            gap: 12px;
            min-height: 48px;
            padding: 12px 20px;
            border: 1px solid transparent;
            border-radius: 999px;
            font-size: 14px;
            font-weight: 600;
            line-height: 1.4;
            text-decoration: none;
            transition: background-color 160ms ease, border-color 160ms ease, transform 140ms cubic-bezier(.16,1,.3,1);
        }
        .exhibition-cta { background: #f5f5f7; color: #080e18; }
        .exhibition-ghost { border-color: #515968; color: #f5f5f7; }
        .exhibition-cta:active,
        .exhibition-ghost:active { transform: scale(0.97); }
        .exhibition a:focus-visible,
        .exhibition button:focus-visible,
        .exhibition-lightbox-viewport:focus-visible {
            outline: 2px solid var(--ex-gold);
            outline-offset: 5px;
        }
        .exhibition-banner { margin: 0; }
        .exhibition-image-link {
            display: block;
            position: relative;
            border-radius: 14px;
            background: #111b2a;
            text-decoration: none;
            cursor: zoom-in;
        }
        .exhibition-image-link img {
            width: 100%;
            height: auto;
            display: block;
            border-radius: inherit;
        }
        .exhibition-banner img { aspect-ratio: 1503 / 502; }
        .exhibition figure figcaption {
            display: flex;
            justify-content: space-between;
            gap: 12px;
            margin-top: 12px;
            font-size: 12px;
            line-height: 1.5;
            color: var(--ex-muted);
        }
        .exhibition-past {
            display: grid;
            grid-template-columns: 320px minmax(0, 1fr);
            gap: 80px;
            align-items: center;
            margin-top: 64px;
            padding-top: 64px;
            border-top: 1px solid rgba(255,255,255,0.16);
        }
        .exhibition-invitation { margin: 0; }
        .exhibition .exhibition-invitation figcaption { margin: 0 0 12px; font-size: 13px; }
        .exhibition-invitation img { aspect-ratio: 3 / 4; }
        .exhibition-past-text { max-width: 590px; }
        .exhibition-past-kicker {
            display: block;
            margin-bottom: 20px;
            font-size: 13px;
            color: var(--ex-muted);
        }
        .exhibition-past-text h3 {
            font-size: clamp(28px, 3vw, 38px);
            font-weight: 600;
            line-height: 1.25;
            letter-spacing: -0.035em;
        }
        .exhibition-past-text h3 span {
            display: block;
            font-size: 20px;
            font-weight: 400;
            letter-spacing: 0;
            margin-top: 10px;
            color: #e0e4eb;
        }
        .exhibition-past-text > p {
            margin-top: 24px;
            font-size: 15px;
            line-height: 1.9;
            color: var(--ex-muted);
            text-wrap: pretty;
        }
        .exhibition-past-text .exhibition-past-tag {
            display: flex;
            flex-wrap: wrap;
            gap: 12px 28px;
            margin-top: 28px;
            padding-top: 20px;
            border-top: 1px solid rgba(255,255,255,0.12);
            font-size: 13px;
            color: #e0e4eb;
        }
        .exhibition-lightbox {
            position: fixed;
            inset: 0;
            width: 100%;
            height: 100vh;
            height: 100dvh;
            max-width: none;
            max-height: none;
            margin: 0;
            padding: 0;
            border: 0;
            border-radius: 0;
            background: #07090d;
            color: #f5f5f7;
            overflow: hidden;
            overscroll-behavior: contain;
        }
        .exhibition-lightbox[open] { display: flex; flex-direction: column; }
        .exhibition-lightbox::backdrop { background: #07090d; }
        .exhibition-lightbox.is-closing { pointer-events: none; }
        .exhibition-lightbox-toolbar {
            display: flex;
            flex: 0 0 auto;
            align-items: center;
            gap: 24px;
            padding: max(18px, env(safe-area-inset-top)) max(24px, env(safe-area-inset-right)) 18px max(24px, env(safe-area-inset-left));
        }
        .exhibition-lightbox-toolbar h3 {
            flex: 1;
            min-width: 0;
            overflow: hidden;
            white-space: nowrap;
            text-overflow: ellipsis;
            font-size: 14px;
            font-weight: 500;
            line-height: 1.5;
            color: #e1e5ed;
            letter-spacing: 0;
        }
        .exhibition-lightbox button {
            display: grid;
            place-items: center;
            flex: 0 0 auto;
            min-width: 44px;
            min-height: 44px;
            padding: 0;
            border: 0;
            border-radius: 50%;
            background: transparent;
            color: #f5f5f7;
            font: inherit;
            font-size: 13px;
            cursor: pointer;
            transition: background-color 140ms ease, transform 120ms cubic-bezier(.16,1,.3,1);
        }
        .exhibition-lightbox button:disabled { color: #77808d; cursor: default; }
        .exhibition-lightbox button:not(:disabled):active { transform: scale(0.94); }
        .exhibition-lightbox .exhibition-lightbox-close { background: #1c212b; }
        .exhibition-lightbox-viewport {
            display: grid;
            place-items: center;
            position: relative;
            flex: 1 1 auto;
            min-height: 0;
            margin: 0 max(24px, env(safe-area-inset-right)) 0 max(24px, env(safe-area-inset-left));
            overflow: hidden;
            touch-action: none;
            -webkit-user-select: none;
            user-select: none;
            cursor: zoom-in;
            outline-offset: -3px;
        }
        .exhibition-lightbox-viewport img {
            display: block;
            grid-area: 1 / 1;
            max-width: none;
            max-height: none;
            width: 0;
            height: 0;
            object-fit: contain;
            transform-origin: center;
            pointer-events: none;
            opacity: 0;
        }
        .exhibition-lightbox-viewport.is-ready img { opacity: 1; }
        .exhibition-lightbox-viewport.is-zoomed { cursor: grab; }
        .exhibition-lightbox-viewport.is-dragging { cursor: grabbing; }
        .exhibition-lightbox-viewport.is-dragging img { will-change: transform; }
        .exhibition-lightbox-message { position: absolute; padding: 24px; text-align: center; color: #aeb6c4; font-size: 14px; }
        .exhibition-lightbox-source { display: inline-flex; align-items: center; min-height: 44px; margin-top: 12px; color: #ffc45c; }
        .exhibition-lightbox-footer {
            display: flex;
            flex: 0 0 auto;
            flex-direction: column;
            align-items: center;
            gap: 12px;
            padding: 18px max(24px, env(safe-area-inset-right)) max(20px, env(safe-area-inset-bottom)) max(24px, env(safe-area-inset-left));
        }
        .exhibition-lightbox-controls {
            display: flex;
            align-items: center;
            gap: 4px;
            padding: 4px;
            border: 1px solid #303743;
            border-radius: 999px;
            background: #171c25;
        }
        .exhibition-lightbox .exhibition-lightbox-reset { min-width: 70px; border-radius: 999px; }
        .exhibition-lightbox-scale { font-size: 13px; font-weight: 500; font-variant-numeric: tabular-nums; }
        .exhibition-lightbox-hint { min-height: 18px; font-size: 12px; line-height: 1.5; color: #a0a9b8; letter-spacing: 0; }
        .lightbox-hint-touch { display: none; }
        .exhibition-lightbox button:focus-visible,
        .exhibition-lightbox-viewport:focus-visible { outline: 2px solid #ffc45c; outline-offset: 3px; }
        .exhibition-lightbox-viewport:focus-visible { outline-offset: -3px; }
        @media (pointer: coarse) {
            .lightbox-hint-touch { display: inline; }
            .lightbox-hint-pointer { display: none; }
        }
        @media (hover: hover) and (pointer: fine) {
            .exhibition-cta:hover { background: #fff; }
            .exhibition-ghost:hover { background: rgba(255,255,255,0.06); border-color: #abb4c3; }
            .exhibition-lightbox button:not(:disabled):hover { background: #303845; }
        }
        @media (prefers-reduced-motion: reduce) {
            .exhibition-cta:active,
            .exhibition-ghost:active,
            .exhibition-lightbox button:not(:disabled):active { transform: none; }
        }
        @media (max-width: 1024px) {
            .exhibition-overview { grid-template-columns: minmax(0, 1fr) 240px; gap: 28px 32px; }
            .exhibition-visit { padding-left: 28px; }
            .exhibition-details { grid-template-columns: 1fr; gap: 16px; }
            .exhibition-detail dd { font-size: 16px; }
            .exhibition-halls { margin-top: 2px; }
            .exhibition-past { grid-template-columns: 280px minmax(0, 1fr); gap: 40px; }
        }
        @media (max-width: 768px) {
            .exhibition-head-row { margin-bottom: 28px; padding-bottom: 18px; }
            .exhibition-badge, .exhibition-countdown { font-size: 12px; }
            .exhibition-overview {
                grid-template-columns: minmax(0, 1fr);
                grid-template-areas: 'title' 'details' 'visit';
                gap: 24px;
                margin-bottom: 28px;
            }
            .exhibition-title-text h2 { font-size: clamp(28px, 7.8vw, 42px); max-width: 13em; }
            .exhibition-name-en { margin-top: 14px; font-size: 13px; }
            .exhibition-subtitle { margin-top: 8px; font-size: 13px; }
            .exhibition-details { grid-template-columns: 1fr; padding-top: 20px; gap: 16px; }
            .exhibition-detail dt { margin-bottom: 4px; font-size: 12px; }
            .exhibition-detail dd { font-size: 16px; }
            .exhibition-visit {
                display: grid;
                grid-template-columns: 1fr;
                gap: 20px;
                padding: 20px 0 0;
                border-left: 0;
                border-top: 1px solid rgba(255,255,255,0.12);
            }
            .exhibition-booth { display: grid; grid-template-columns: 1fr auto; gap: 4px 16px; align-items: center; }
            .exhibition-booth-label { margin: 0; font-size: 12px; }
            .exhibition-booth-number { grid-column: 2; grid-row: 1 / 3; font-size: 44px; }
            .exhibition-booth-hall { margin: 0; font-size: 14px; }
            .exhibition-cta-group { grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 0; }
            .exhibition-cta, .exhibition-ghost { min-height: 48px; padding: 12px 16px; }
            .exhibition-image-link { border-radius: 10px; }
            .exhibition figure figcaption { margin-top: 10px; font-size: 12px; }
            .exhibition-past { grid-template-columns: 1fr; gap: 28px; margin-top: 40px; padding-top: 40px; }
            .exhibition-invitation { width: min(100%, 360px); }
            .exhibition-past-text { max-width: none; }
            .exhibition-past-kicker { margin-bottom: 14px; }
            .exhibition-past-text h3 { font-size: 30px; }
            .exhibition-past-text h3 span { font-size: 18px; }
            .exhibition-past-text > p { margin-top: 20px; font-size: 14px; }
            .exhibition-past-text .exhibition-past-tag { margin-top: 24px; }
            .exhibition-lightbox-toolbar { gap: 16px; padding: max(12px, env(safe-area-inset-top)) max(16px, env(safe-area-inset-right)) 12px max(16px, env(safe-area-inset-left)); }
            .exhibition-lightbox-toolbar h3 { font-size: 13px; }
            .exhibition-lightbox-viewport { margin: 0 max(12px, env(safe-area-inset-right)) 0 max(12px, env(safe-area-inset-left)); }
            .exhibition-lightbox-footer { gap: 10px; padding-top: 16px; padding-bottom: max(16px, env(safe-area-inset-bottom)); }
        }

        /* ===== PRODUCTS - MATERIAL CATALOG ===== */
        #products { --section-pad: 80px; --section-pad-mobile: 24px; background: #f4f6f8; scroll-margin-top: 76px; }
        #products .products-heading-title { display: flex; flex-wrap: wrap; align-items: baseline; gap: 12px 24px; }
        #products .products-total { color: #536b83; font-size: 13px; white-space: nowrap; }
        #products .products-intro { display: grid; grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr); align-items: start; gap: 40px 64px; margin-bottom: 28px; }
        #products .products-heading h2 { font-size: clamp(36px, 3.8vw, 50px); font-weight: 650; letter-spacing: -0.035em; line-height: 1.2; }
        #products .products-heading p { margin-top: 18px; font-size: 16px; line-height: 1.7; color: #606b78; text-wrap: pretty; }
        #products .products-find { min-width: 0; }
        #products .products-search-label { display: block; margin-bottom: 10px; font-size: 13px; font-weight: 500; color: #455263; }
        #products .grade-search { max-width: none; margin: 0; }
        #products .grade-search input { height: 56px; padding: 0 54px 0 50px; border-radius: 14px; border-color: #c7d0da; background: #fff; transition: border-color 160ms ease, box-shadow 160ms ease; }
        #products .grade-search input::placeholder { color: #6a7480; }
        #products .grade-search > svg { left: 18px; right: auto; width: 19px; height: 19px; color: #617488; }
        #products .grade-search.has-text > svg { display: block; }
        #products .grade-search .clear-btn { right: 6px; background: transparent; }
        #products .products-quick { display: flex; flex-wrap: wrap; align-items: center; gap: 2px 8px; margin-top: 10px; }
        #products .products-quick > span { font-size: 12px; color: #606b78; margin-right: 4px; }
        #products .products-quick button { min-height: 44px; padding: 8px 9px; border: 1px solid #d5dfe9; border-radius: 8px; background: #fff; color: #455263; font: inherit; font-size: 12px; cursor: pointer; transition: background-color 140ms ease, color 140ms ease, transform 120ms cubic-bezier(.23,1,.32,1); }
        #products .products-quick button[aria-pressed="true"] { background: #dcebf9; color: #0055ad; }
        #products .products-quick button:active { transform: scale(.97); }
        #products .grade-search-status { max-width: none; margin: 0 0 24px; padding-top: 22px; border-top: 1px solid #d5dce4; color: #606b78; font-size: 13px; line-height: 1.65; }
        #products .products-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
        #products .product-card { display: flex; position: relative; min-width: 0; padding: 28px; border: 1px solid #dbe1e8; border-radius: 16px; background: #fff; color: #1d1d1f; text-decoration: none; transition: border-color 180ms ease; }
        #products .product-card-wide { grid-column: 1 / -1; }
        #products .product-card-content { display: flex; flex-direction: column; width: 100%; min-width: 0; }
        #products .product-card-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 20px; margin-bottom: 20px; }
        #products .product-card h4 { min-width: 0; font-weight: 600; line-height: 1.3; letter-spacing: -0.035em; }
        #products .product-name { display: block; font-size: 28px; text-wrap: balance; }
        #products .product-name-code { font-size: 42px; font-weight: 650; line-height: 1; letter-spacing: -0.035em; }
        #products .product-subtitle { display: block; margin-top: 12px; font-size: 15px; font-weight: 400; line-height: 1.5; letter-spacing: 0; color: #606b78; }
        #products .product-art { flex: 0 0 72px; width: 72px; height: 72px; color: #648bb1; }
        #products .product-art-accent { color: #0066cc; transform-box: fill-box; transform-origin: center; transition: transform 220ms cubic-bezier(.23,1,.32,1); }
        #products .product-field-label { display: block; margin-bottom: 8px; font-size: 12px; font-weight: 500; line-height: 1.5; color: #606b78; }
        #products .product-models-block { flex: 1; padding: 16px 18px; margin-bottom: 20px; border-radius: 8px; background: #f3f6fa; }
        #products .product-models,
        #products .product-series { font-size: 14px; font-weight: 500; line-height: 1.85; color: #405168; overflow-wrap: anywhere; font-variant-numeric: tabular-nums; }
        #products .product-series + .product-field-label { margin-top: 14px; }
        #products .product-models { display: flex; flex-wrap: wrap; gap: 4px 14px; align-content: start; }
        #products .product-model { display: inline-block; white-space: nowrap; border-radius: 3px; }
        #products .product-model.is-match { color: #0055ad; background: #deedfb; box-shadow: 0 0 0 3px #deedfb; }
        #products .product-model-note { margin-top: 12px; padding-top: 10px; border-top: 1px solid #d8e2ed; font-size: 12px; line-height: 1.7; color: #586575; }
        #products .product-description { margin: 0 0 20px; font-size: 15px; line-height: 1.85; color: #586575; text-wrap: pretty; }
        #products .product-applications { margin: 0 0 16px; }
        #products .product-applications .product-field-label { margin-bottom: 6px; }
        #products .product-tags { display: flex; flex-wrap: wrap; gap: 4px 16px; }
        #products .product-tag { position: relative; padding: 0; border: 0; border-radius: 0; color: #3e566e; font-size: 14px; font-weight: 500; line-height: 1.7; background: transparent; }
        #products .product-tag:not(:last-child)::after { content: ''; position: absolute; right: -8px; top: .45em; height: .8em; border-right: 1px solid #c7d5e1; }
        #products .product-more { text-decoration: none; display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 44px; margin-top: auto; padding-top: 16px; border-top: 1px solid #e3e8ee; color: #0066cc; font-size: 14px; font-weight: 500; line-height: 1.5; }
        #products .product-more svg { width: 19px; height: 19px; transition: transform 180ms cubic-bezier(.23,1,.32,1); }
        #products .product-title-link { color: inherit; text-decoration: none; }
        #products .product-title-link:focus-visible, #products .product-more:focus-visible { outline: 2px solid #0066cc; outline-offset: 5px; border-radius: 3px; }
        #products .product-card:focus-within { border-color: #8eb4d9; }
        #products .products-directory { position: sticky; top: 76px; z-index: 6; display: flex; align-items: center; gap: 16px; margin-bottom: 24px; background: #f4f6f8; border-bottom: 1px solid #cfd9e4; }
        #products .products-family-nav { flex: 1; min-width: 0; display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); }
        #products .products-family-label-short { display: none; }
        #products .products-find-trigger { flex: none; display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px; padding: 10px 16px; border: 1px solid #b8cbdd; border-radius: 8px; color: #0055ad; background: #fff; font: inherit; font-size: 14px; font-weight: 500; cursor: pointer; transition: background-color 140ms ease, border-color 140ms ease, transform 120ms cubic-bezier(.23,1,.32,1); }
        #products .products-find-trigger svg { width: 18px; height: 18px; flex: none; }
        #products .products-find-trigger:focus-visible { outline: 2px solid #0066cc; outline-offset: 3px; }
        #products .products-find-trigger:active { transform: scale(.97); }
        #products .products-family-nav a { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 64px; padding: 14px 20px; border-bottom: 2px solid transparent; color: #455263; font-size: 15px; font-weight: 500; text-decoration: none; transition: color 140ms ease, border-color 140ms ease, background-color 140ms ease; }
        #products .products-family-nav small { font-size: 12px; font-weight: 400; color: #606b78; white-space: nowrap; }
        #products .products-family-nav a[aria-current="location"] { border-bottom-color: #0066cc; color: #0055ad; background: #eaf1f8; }
        #products .products-find { scroll-margin-top: 96px; }
        #products .product-group { scroll-margin-top: 172px; }
        #products .product-group:focus { outline: none; }
        #products .product-group + .product-group { margin-top: 56px; }
        #products .product-group-head { display: flex; align-items: baseline; justify-content: space-between; gap: 16px 24px; margin-bottom: 20px; }
        #products .product-group-head > div { display: flex; flex-wrap: wrap; align-items: baseline; gap: 8px 16px; }
        #products .product-group-head h3 { color: #263e56; font-size: 24px; font-weight: 600; line-height: 1.4; letter-spacing: -.025em; }
        #products .product-group-head p { color: #606b78; font-size: 13px; line-height: 1.7; }
        #products .product-group-summary { flex-shrink: 0; font-variant-numeric: tabular-nums; }
        #products:not(.is-searching) .grade-search-status { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
        #products .grade-search input::-webkit-search-cancel-button { display: none; }
        #products .grade-results { padding: 24px 28px; margin-bottom: 24px; border: 1px solid #c7d9ea; border-radius: 20px; background: #fff; }
        #products .grade-results-heading { font-size: 18px; margin-bottom: 12px; }
        #products .grade-result { border-color: #e0e6ee; padding: 12px 0; }
        #products .grade-result:last-of-type { border-bottom-color: #e0e6ee; }
        #products .grade-result-info { gap: 2px 14px; }
        #products .grade-result-category { font-size: 13px; }
        #products .grade-result-actions a, #products .grade-results-more { border-color: #c7d9ea; border-radius: 9px; font-size: 13px; }
        #products .grade-empty { padding: 40px 24px; border: 1px solid #dbe1e8; border-radius: 20px; background: #fff; text-align: center; }
        #products .grade-empty h3 { font-size: 22px; font-weight: 600; color: #1d1d1f; }
        #products .grade-empty p { margin-top: 12px; line-height: 1.7; font-size: 14px; }
        #products .grade-empty-actions { display: flex; justify-content: center; align-items: center; flex-wrap: wrap; gap: 8px 20px; margin-top: 24px; }
        #products .grade-empty-actions a { display: inline-flex; align-items: center; min-height: 44px; font-size: 14px; }
        #products .products-reset { min-height: 44px; padding: 10px 20px; background: #0066cc; border: 0; border-radius: 10px; color: #fff; font: inherit; font-size: 14px; font-weight: 500; cursor: pointer; }
        @media (hover: hover) and (pointer: fine) {
            #products .product-card:hover { border-color: #b5c8da; }
            #products .product-more:hover svg { transform: translateX(4px); }
            #products .product-card:has(a:hover) .product-art-accent { transform: translateY(-2px); }
            #products .product-title-link:hover { color: #0055ad; }
            #products .product-more:hover { text-decoration: underline; text-underline-offset: 4px; }
            #products .products-family-nav a:hover { color: #0055ad; background: #edf2f8; }
            #products .products-quick button:hover { background: #e6edf5; color: #0055ad; }
            #products .grade-search .clear-btn:hover { background: #edf2f7; }
            #products .products-reset:hover { background: #0055ad; }
            #products .products-find-trigger:hover { background: #eaf1f8; border-color: #88aacb; }
        }
        /* 相邻材料按信息行对齐；短型号列表的留白收口在资料区，参数入口齐底。 */
        @supports (grid-template-rows: subgrid) {
            @media (min-width: 769px) {
                #products .products-grid { row-gap: 16px; }
                #products .product-card { display: grid; grid-row: span 5; grid-template-rows: subgrid; }
                #products .product-card-content { display: grid; grid-row: 1 / -1; grid-template-rows: subgrid; }
                #products .product-card-head, #products .product-applications,
                #products .product-description, #products .product-models-block { margin: 0; }
                #products .product-more { align-self: end; margin: 0; }
            }
        }
        @media (max-width: 1024px) {
            #products .products-intro { gap: 32px; grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); }
            #products .product-card { padding: 26px; }
            #products .product-name { font-size: 25px; }
            #products .product-name-code { font-size: 40px; }
            #products .product-art { flex-basis: 64px; width: 64px; height: 64px; }
        }
        @media (max-width: 768px) {
            #products .products-intro { grid-template-columns: minmax(0,1fr); gap: 12px; margin-bottom: 12px; }
            #products .products-heading h2 { font-size: 32px; }
            #products .products-heading-title { justify-content: space-between; gap: 8px 12px; }
            #products .products-total { font-size: 14px; }
            #products .products-heading p { margin-top: 8px; font-size: 14px; }
            #products .products-search-label { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
            #products .grade-search input { height: 52px; }
            #products .products-quick { margin-top: 8px; }
            #products .products-directory { gap: 8px; margin-bottom: 16px; }
            #products .products-family-nav a { flex-direction: column; justify-content: center; gap: 2px; min-height: 56px; padding: 8px 4px; font-size: 14px; }
            #products .products-family-label-full { display: none; }
            #products .products-family-label-short { display: inline; }
            #products .products-family-nav small { font-size: 12px; }
            #products .products-find-trigger { flex-direction: column; width: 52px; min-height: 48px; gap: 2px; padding: 4px; font-size: 13px; border-color: transparent; background: transparent; }
            #products .products-find-trigger svg { width: 17px; height: 17px; }
            #products .product-group { scroll-margin-top: 152px; }
            #products .product-group + .product-group { margin-top: 40px; }
            #products .product-group-head { margin-bottom: 12px; }
            #products .product-group-head h3 { font-size: 20px; }
            #products .product-group-head p { font-size: 12px; }
            #products .product-group-summary { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
            #products .products-quick > span { display: none; }
            #products .products-grid { grid-template-columns: minmax(0,1fr); gap: 16px; }
            #products .product-card { padding: 20px; border-radius: 16px; }
            #products .product-card-head { gap: 12px; margin-bottom: 16px; }
            #products .product-name { font-size: 25px; }
            #products .product-name-code { font-size: 38px; }
            #products .product-subtitle { font-size: 14px; margin-top: 8px; }
            #products .product-art { flex-basis: 60px; width: 60px; height: 60px; }
            #products .product-models-block { padding: 14px; }
            #products .product-description { font-size: 15px; line-height: 1.85; margin-bottom: 16px; }
            #products .product-applications { margin: 0 0 12px; }
            #products .grade-results { padding: 20px; border-radius: 16px; }
            #products .grade-search-status { padding-top: 20px; margin-bottom: 20px; }
        }
        @media (prefers-reduced-motion: reduce) {
            #products *, #products *::before, #products *::after { transition: none !important; }
            #products .product-card:hover, #products .product-more:hover svg,
            #products .product-card:has(a:hover) .product-art-accent, #products .products-quick button:active,
            #products .products-find-trigger:active { transform: none; }
        }

        /* ===== APPLICATIONS ===== */
        .applications {
            background: #000;
            color: #fff;
        }
        .applications .section-title { color: #f5f5f7; }
        .applications .section-subtitle { color: #c4d4e7; }
        .apps-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .app-card { display: grid; grid-template-columns: 40px minmax(0, 1fr); gap: 8px 16px; align-content: start; text-decoration: none; color: inherit; background: #101010; border: 1px solid #303033; border-radius: 16px; padding: 26px 24px; transition: border-color 0.2s, background 0.2s; }
        .app-card:hover { background: #181818; border-color: #9c7a24; }
        .app-icon { width: 40px; height: 40px; grid-row: 1 / 4; display: flex; align-items: center; justify-content: center; color: #ffd16d; }
        .app-icon svg { width: 24px; height: 24px; }
        .app-card h3 {
            font-size: 19px;
            font-weight: 600;
            color: #f5f5f7;
            margin-bottom: 8px;
            letter-spacing: -0.02em;
        }
        .app-card p {
            font-size: 14px;
            color: #c4d4e7;
            line-height: 1.6;
            grid-column: 2;
        }
        .app-more {
            grid-column: 2;
            display: inline-flex;
            align-items: center;
            gap: 5px;
            margin-top: 16px;
            font-size: 13px;
            font-weight: 500;
            color: #ffb500;
            transition: gap 0.2s;
        }
        .app-card:hover .app-more { opacity: 1; gap: 8px; }

        /* ===== CONTACT - DIRECT CONNECTIONS ===== */
        #contact:focus { outline: none; }
        #contact { --section-pad: 88px; --section-pad-mobile: 40px; background: #fff; }
        #contact .section-inner { max-width: 1120px; }
        #contact .contact-heading { margin-bottom: 36px; }
        #contact .contact-heading-title { display: flex; flex-wrap: wrap; align-items: baseline; gap: 12px 24px; margin-bottom: 16px; }
        #contact h2 { font-size: clamp(36px, 3.8vw, 50px); font-weight: 650; line-height: 1.2; letter-spacing: -.035em; }
        #contact .contact-heading-title > p { font-size: 15px; color: #536b83; letter-spacing: 0; }
        #contact .company-name { font-size: 17px; font-weight: 500; line-height: 1.6; color: #405168; }
        #contact .company-name-en { margin-top: 4px; font-size: 14px; line-height: 1.6; color: #606b78; letter-spacing: 0; }
        #contact .contact-context { max-width: 680px; margin-top: 20px; padding: 14px 16px; border: 1px solid #c7d8e9; border-radius: 8px; color: #254e76; background: #f0f5fa; font-size: 14px; line-height: 1.7; overflow-wrap: anywhere; }
        #contact .contact-context-summary { font-size: 16px; font-weight: 600; }
        #contact .contact-context-note { margin-top: 6px; color: #536b83; }
        #contact .contact-context-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 16px; margin-top: 12px; }
        #contact .contact-copy.contact-copy-inquiry { flex-direction: row; width: auto; height: auto; min-height: 44px; padding: 10px 14px; gap: 6px; background: #e3edf7; border-color: #b8cbdd; font-size: 14px; }
        #contact .contact-draft-email { display: inline-flex; align-items: center; min-height: 44px; color: #0055ad; text-underline-offset: 4px; }
        #contact .contact-draft { margin-top: 8px; color: #405168; }
        #contact .contact-draft summary { display: list-item; width: fit-content; max-width: 100%; min-height: 44px; padding: 10px 0; cursor: pointer; }
        #contact .contact-draft summary:focus-visible, #contact .contact-context-actions :focus-visible { outline: 2px solid #0066cc; outline-offset: 3px; }
        #contact #contactDraftText { margin-top: 2px; padding: 12px; border-top: 1px solid #c7d8e9; font-size: 16px; white-space: pre-line; user-select: text; -webkit-user-select: text; }
        #contact .contact-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 416px); gap: clamp(40px, 6vw, 80px); align-items: start; }
        #contact .contact-info { min-width: 0; }
        #contact .contact-item { display: flex; align-items: center; gap: 16px; padding: 20px 0; border-bottom: 1px solid #e1e7ed; }
        #contact .contact-heading + .contact-item { padding-top: 0; }
        #contact .contact-item-icon { flex: 0 0 36px; width: 36px; height: 40px; display: flex; align-items: center; justify-content: center; color: #648bb1; }
        #contact .contact-item-icon svg { width: 22px; height: 22px; }
        #contact .contact-item-content { flex: 1; min-width: 0; }
        #contact .contact-item h3 { margin-bottom: 2px; color: #606b78; font-size: 13px; font-weight: 500; line-height: 1.5; letter-spacing: 0; }
        #contact .contact-item p { font-size: 16px; line-height: 1.6; color: #405168; }
        #contact .contact-link { display: inline-flex; flex-wrap: wrap; align-items: center; gap: 4px 12px; min-height: 44px; max-width: 100%; color: #254e76; text-decoration: underline; text-decoration-color: #b1c8df; text-underline-offset: 5px; text-decoration-thickness: 1px; font-size: 17px; line-height: 1.5; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; transition: color 140ms ease, text-decoration-color 140ms ease; }
        #contact .contact-phone-primary { color: #0055ad; font-size: clamp(24px, 2.2vw, 30px); font-weight: 600; letter-spacing: -.025em; }
        #contact .contact-person { margin-left: 10px; color: #405168; }
        #contact .contact-address { color: #405168; font-size: 16px; font-style: normal; line-height: 1.8; overflow-wrap: anywhere; }
        #contact .contact-copy { flex: none; display: inline-flex; align-items: center; justify-content: center; gap: 5px; width: 76px; min-height: 44px; padding: 8px 10px; border: 1px solid #d7e3ee; border-radius: 8px; background: #f0f5fa; color: #345d85; font: inherit; font-size: 12px; line-height: 1.5; cursor: pointer; transition: background-color 140ms ease, border-color 140ms ease, transform 120ms cubic-bezier(.16,1,.3,1); }
        #contact .contact-copy span { white-space: nowrap; }
        #contact .contact-copy svg { flex: none; width: 15px; height: 15px; }
        #contact .contact-copy .copy-check { display: none; }
        #contact .contact-copy[data-copied="true"] { background: #e5f2ee; color: #21634f; }
        #contact .contact-copy[data-copied="true"] .copy-icon { display: none; }
        #contact .contact-copy[data-copied="true"] .copy-check { display: block; }
        #contact .contact-copy:disabled { cursor: progress; opacity: .65; }
        #contact .contact-copy:active { transform: scale(.96); }
        /* Success is visible on the button; keep the shared live status out of the reading flow. */
        #contact .contact-feedback { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
        #contact .contact-feedback.is-error { position: static; width: auto; height: auto; margin: 8px 0 0; overflow: visible; clip-path: none; white-space: normal; color: #964030; font-size: 13px; line-height: 1.7; overflow-wrap: anywhere; }
        #contact .contact-channels { min-width: 0; padding-top: 8px; }
        #contact .contact-channels > h3 { font-size: 20px; font-weight: 600; letter-spacing: -.02em; line-height: 1.4; }
        #contact .contact-channels-note { margin-top: 6px; margin-bottom: 16px; color: #606b78; font-size: 14px; line-height: 1.65; }
        #contact .contact-qr-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
        #contact .qr-card { min-width: 0; margin: 0; }
        #contact .contact-qr-open { display: block; height: 100%; padding: 12px; border: 1px solid #dbe3ec; border-radius: 12px; background: #f7f9fb; color: #1d1d1f; text-align: left; text-decoration: none; transition: border-color 160ms ease, background-color 160ms ease; }
        #contact .qr-card img { display: block; width: 100%; max-width: 148px; height: auto; margin: 0 auto; aspect-ratio: 1; object-fit: contain; padding: 12px; background: #fff; border-radius: 4px; }
        #contact .qr-card .qr-caption { display: grid; grid-template-columns: minmax(0, 1fr); gap: 2px; margin-top: 10px; }
        #contact .qr-card h4 { font-size: 16px; font-weight: 600; line-height: 1.5; letter-spacing: 0; }
        #contact .qr-card .qr-caption p { grid-column: 1 / -1; color: #606b78; font-size: 14px; line-height: 1.6; }
        #contact .qr-open-label { grid-column: 1; grid-row: 3; display: flex; align-items: center; justify-content: space-between; gap: 8px; min-height: 36px; margin-top: 6px; border-top: 1px solid #dbe3ec; color: #345d85; font-size: 14px; font-weight: 500; line-height: 1.5; white-space: nowrap; }
        #contact .qr-open-label svg { width: 14px; height: 14px; }
        #contact a:focus-visible, #contact button:focus-visible { outline: 2px solid #0066cc; outline-offset: 4px; }
        .contact-qr-dialog { width: min(460px, calc(100% - 32px)); max-height: calc(100vh - 40px); max-height: calc(100dvh - 40px); margin: auto; padding: 0; border: 0; border-radius: 16px; background: #fff; color: #1d1d1f; box-shadow: 0 24px 80px rgba(0,0,0,.24); overflow: auto; overscroll-behavior: contain; }
        .contact-qr-dialog::backdrop { background: rgba(13,23,35,.64); }
        .contact-qr-dialog-header { position: sticky; top: 0; z-index: 1; background: #fff; display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 20px 24px 16px; }
        .contact-qr-dialog-header h3 { font-size: 23px; font-weight: 600; line-height: 1.4; letter-spacing: -.025em; }
        .contact-qr-dialog-header p { margin-top: 3px; color: #606b78; font-size: 14px; line-height: 1.6; }
        .contact-qr-close { flex: none; display: flex; align-items: center; justify-content: center; width: 44px; height: 44px; border: 1px solid #dbe3ec; border-radius: 50%; background: #f4f7fa; color: #405168; cursor: pointer; transition: background-color 140ms ease, transform 120ms cubic-bezier(.16,1,.3,1); }
        .contact-qr-close svg { width: 20px; height: 20px; }
        .contact-qr-close:active { transform: scale(.94); }
        .contact-qr-stage { padding: 8px 32px 16px; text-align: center; background: #fff; }
        .contact-qr-stage img { display: block; width: 100%; height: auto; max-height: 38vh; max-height: min(38dvh, 300px); aspect-ratio: 1; padding: 16px; object-fit: contain; background: #fff; }
        .contact-qr-message { min-height: 80px; display: flex; align-items: center; justify-content: center; color: #606b78; font-size: 14px; line-height: 1.7; }
        .contact-qr-dialog-footer { padding: 18px 24px 24px; border-top: 1px solid #e1e7ed; background: #f7f9fb; text-align: center; }
        #contactQrHint { color: #405168; font-size: 15px; font-weight: 500; line-height: 1.6; }
        .contact-qr-save-note { margin-top: 12px; color: #606b78; font-size: 14px; line-height: 1.7; }
        .contact-qr-source { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px; margin-top: 12px; padding: 10px 20px; border: 1px solid #b8cbdd; border-radius: 8px; background: #fff; color: #0055ad; font-size: 14px; font-weight: 500; text-decoration: none; }
        .contact-qr-source svg { width: 16px; height: 16px; }
        .contact-qr-same-phone { margin-top: 16px; padding-top: 14px; border-top: 1px solid #dbe3ec; text-align: left; }
        .contact-qr-same-phone h4 { color: #254e76; font-size: 15px; font-weight: 600; line-height: 1.6; }
        .contact-qr-steps { margin-top: 8px; padding-left: 22px; color: #405168; font-size: 14px; line-height: 1.75; }
        .contact-qr-steps li + li { margin-top: 4px; }
        .contact-qr-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin-top: 16px; }
        .contact-qr-actions .contact-qr-source { margin-top: 0; padding: 10px 14px; }
        #contact .contact-copy.contact-qr-copy { width: auto; height: auto; min-height: 44px; padding: 10px 14px; flex-direction: row; gap: 6px; font-size: 14px; }
        .contact-qr-link-value { margin-top: 12px; padding: 10px 12px; border: 1px solid #d7e3ee; border-radius: 8px; background: #fff; color: #405168; font-size: 14px; line-height: 1.7; overflow-wrap: anywhere; -webkit-user-select: text; user-select: text; }
        .contact-qr-feedback { margin-top: 10px; color: #345d85; font-size: 14px; line-height: 1.7; overflow-wrap: anywhere; }
        .contact-qr-feedback:empty { display: none; }
        .contact-qr-dialog a:focus-visible, .contact-qr-dialog button:focus-visible { outline: 2px solid #0066cc; outline-offset: 4px; }
        @media (hover: hover) and (pointer: fine) {
            #contact .contact-link:hover { color: #0066cc; text-decoration-color: #0066cc; }
            #contact .contact-copy:hover { background: #e3edf7; border-color: #b8cbdd; }
            #contact .contact-qr-open:hover { background: #eff4f9; border-color: #8eb4d9; }
            .contact-qr-close:hover, .contact-qr-source:hover { background: #eaf1f8; }
        }
        @media (max-width: 1100px) {
            #contact .contact-grid { gap: 40px; }
            #contact .contact-item { gap: 10px; }
            #contact .contact-item-icon { flex-basis: 28px; width: 28px; }
        }
        @media (max-width: 900px) {
            #contact .contact-grid { grid-template-columns: minmax(0, 1fr); gap: 28px; }
            #contact .contact-qr-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
            #contact .contact-item-icon { flex-basis: 36px; width: 36px; }
            #contact .contact-channels { padding-top: 0; }
        }
        @media (max-width: 768px) {
            #contact { --section-pad-mobile: 32px; }
            #contact .contact-grid { gap: 24px; }
            #contact .contact-heading { margin-bottom: 20px; }
            #contact .contact-heading-title { gap: 8px 16px; margin-bottom: 10px; }
            #contact h2 { font-size: 32px; }
            #contact .company-name { font-size: 16px; }
            #contact .company-name-en { font-size: 13px; }
            #contact .contact-item { gap: 10px; padding: 12px 0; }
            #contact .contact-item-icon { flex-basis: 24px; width: 24px; }
            #contact .contact-item-icon svg { width: 20px; height: 20px; }
            #contact .contact-link { font-size: 16px; gap: 2px 8px; }
            #contact .contact-phone-primary { font-size: 25px; }
            #contact .contact-copy { width: 68px; gap: 4px; padding: 8px; }
            #contact .contact-address { font-size: 15px; line-height: 1.8; }
            #contact .contact-qr-grid { gap: 12px; }
            #contact .contact-channels > h3 { font-size: 20px; }
            #contact .contact-channels-note { font-size: 14px; margin-bottom: 16px; }
            #contact .qr-card img { padding: 12px; }
            #contact .qr-card .qr-caption { margin-top: 10px; }
            #contact .qr-card h4 { font-size: 15px; }
            .contact-qr-dialog-header { padding: 18px 20px 12px; }
            .contact-qr-stage { padding: 4px 20px 16px; }
            .contact-qr-stage img { padding: 12px; }
            .contact-qr-dialog-footer { padding: 16px 20px 20px; }
        }
        @media (max-width: 640px) {
            #contact .contact-qr-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
        }
        @media (max-width: 420px) {
            #contact .contact-copy { flex-direction: column; width: 48px; height: 48px; gap: 2px; padding: 4px; font-size: 13px; }
        }
        @media (prefers-reduced-motion: reduce) {
            #contact *, .contact-qr-dialog * { transition: none !important; }
            #contact .contact-copy:active, .contact-qr-close:active { transform: none; }
        }

        /* ===== FOOTER ===== */
        .footer {
            background: #1d1d1f;
            padding: 48px 24px;
            padding-left: max(24px, env(safe-area-inset-left));
            padding-right: max(24px, env(safe-area-inset-right));
        }
        .footer-inner {
            max-width: var(--max-width);
            margin: 0 auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px 32px;
            flex-wrap: wrap;
        }
        .footer-logo {
            display: flex;
            align-items: center;
            gap: 8px;
            color: #f5f5f7;
            font-weight: 600;
            font-size: 14px;
            text-decoration: none;
        }
        .footer-logo svg { width: 48px; height: auto; color: #f5f5f7; }
        .footer-links {
            display: flex;
            gap: 24px;
        }
        .footer-links a {
            color: #86868b;
            font-size: 13px;
            text-decoration: none;
            transition: color 0.3s;
            display: inline-flex;
            align-items: center;
            min-height: 44px;
        }
        .footer-links a:hover { color: #f5f5f7; }
        .footer-copy {
            font-size: 13px;
            color: #86868b;
        }
        .footer-icp {
            font-size: 13px;
            color: #86868b;
            text-decoration: none;
            transition: color 0.3s;
        }
        .footer-icp:hover { color: #f5f5f7; }

        /* ===== GRADE SEARCH ===== */
        .grade-search { max-width: 620px; margin: 0 auto 16px; position: relative; }
        .grade-search input {
            width: 100%; height: 52px; padding: 0 52px 0 22px;
            border-radius: 999px; border: 1px solid var(--border-light);
            font-size: 16px; font-family: inherit;
            background: #fff; color: var(--text-primary);
            outline: none; transition: border-color 0.3s, box-shadow 0.3s;
            box-sizing: border-box;
            -webkit-appearance: none;
        }
        .grade-search input::placeholder { color: #62626a; opacity: 1; }
        .grade-search input:focus { border-color: var(--accent-blue); box-shadow: 0 0 0 4px rgba(0,102,204,0.12); }
        .grade-search input::-webkit-search-cancel-button { -webkit-appearance: none; appearance: none; display: none; }
        .grade-search input::-webkit-search-decoration { -webkit-appearance: none; appearance: none; }
        .grade-search > svg {
            position: absolute; right: 20px; top: 50%; transform: translateY(-50%);
            width: 18px; height: 18px; color: var(--text-secondary); pointer-events: none;
        }
        .grade-search .clear-btn {
            display: none;
            position: absolute; right: 4px; top: 50%; transform: translateY(-50%);
            width: 44px; height: 44px; border: none; border-radius: 50%;
            background: #e8e8ed; color: #1d1d1f; cursor: pointer;
            align-items: center; justify-content: center; padding: 0;
            transition: background 0.2s;
        }
        .grade-search .clear-btn:hover { background: #d8d8df; }
        .grade-search .clear-btn svg { width: 14px; height: 14px; }
        .grade-search.has-text .clear-btn { display: flex; }
        .grade-search.has-text > svg { display: none; }
        .grade-empty { display: none; text-align: center; color: var(--text-secondary); font-size: 14px; padding: 24px 0; }
        #gradeSearchEmpty:not([hidden]) { display: block; }
        .grade-empty a { color: var(--accent-blue); }
        .grade-search-status { margin: 0 auto 28px; max-width: 620px; color: var(--text-secondary); font-size: 14px; line-height: 1.6; }
        .grade-results { margin-bottom: 32px; }
        .grade-results-heading { margin-bottom: 16px; color: var(--text-primary); font-size: 20px; font-weight: 600; }
        .grade-result { display: flex; align-items: center; justify-content: space-between; gap: 16px 24px; padding: 16px 0; border-top: 1px solid #d8d8de; }
        .grade-result:last-of-type { border-bottom: 1px solid #d8d8de; }
        .grade-result-info { display: flex; align-items: baseline; flex-wrap: wrap; gap: 4px 16px; min-width: 0; }
        .grade-result-model { display: inline-flex; align-items: center; min-height: 44px; font-size: 18px; font-weight: 600; color: var(--accent-blue); overflow-wrap: anywhere; text-decoration-thickness: 1px; }
        .grade-result-category { color: var(--text-secondary); font-size: 14px; }
        .grade-result-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 8px 12px; flex: none; }
        .grade-result-actions a, .grade-results-more { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 10px 16px; border: 1px solid #b8cce0; border-radius: 8px; color: #0058b0; background: #fff; font-family: inherit; font-size: 14px; font-weight: 500; text-decoration: none; cursor: pointer; }
        .grade-result-actions a:hover, .grade-results-more:hover { background: #edf5fd; border-color: var(--accent-blue); }
        .grade-results-more { margin-top: 16px; }

        /* ===== BACK TO TOP ===== */
        .back-top {
            position: fixed;
            bottom: calc(24px + env(safe-area-inset-bottom));
            right: calc(24px + env(safe-area-inset-right));
            width: 52px; height: 52px;
            background: rgba(246,249,252,.96);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid rgba(178,197,216,.8);
            box-shadow: 0 4px 16px rgba(23,42,64,.16), 0 1px 3px rgba(23,42,64,.08);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            pointer-events: none;
            transform: translateY(calc(10px - var(--back-top-lift, 0px))) scale(.96);
            transition: opacity 160ms ease, transform 220ms cubic-bezier(.23,1,.32,1), visibility 0s 160ms, background-color 160ms ease, border-color 160ms ease;
            z-index: 990;
            color: #345d85;
            -webkit-tap-highlight-color: transparent;
            touch-action: manipulation;
        }
        .back-top.visible { opacity: 1; visibility: visible; pointer-events: auto; transform: translateY(calc(0px - var(--back-top-lift, 0px))) scale(1); transition-delay: 0s; }
        .back-top.visible:active { transform: translateY(calc(0px - var(--back-top-lift, 0px))) scale(.94); transition-duration: 100ms; }
        /* 避让即时生效，防止位移动画经过资料链接；空间不足时立即让出点击区域。 */
        .back-top.is-avoiding { transition-property: background-color, border-color; }
        .back-top.is-obstructed { opacity: 0; visibility: hidden; pointer-events: none; transition: none; }
        .back-top:focus-visible { outline: 2px solid #0066cc; outline-offset: 4px; }
        .back-top-ring { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; transform: rotate(-90deg); }
        .back-top-track { stroke: #dce5ee; stroke-width: 1.4; }
        .back-top-progress { stroke: #5b86ae; stroke-width: 1.8; stroke-linecap: round; stroke-dasharray: 100; stroke-dashoffset: calc(100 - var(--back-top-progress, 0) * 100); }
        .back-top-arrow { width: 22px; height: 22px; pointer-events: none; transition: transform 180ms cubic-bezier(.23,1,.32,1); }
        .back-top-label { position: absolute; right: calc(100% + 12px); padding: 7px 12px; border: 1px solid #dbe3ec; border-radius: 8px; background: #f6f9fc; color: #345d85; box-shadow: 0 3px 12px rgba(23,42,64,.08); font: 500 12px/1.5 -apple-system, BlinkMacSystemFont, "PingFang SC", sans-serif; white-space: nowrap; opacity: 0; visibility: hidden; transform: translateX(4px); pointer-events: none; transition: opacity 140ms ease, transform 180ms cubic-bezier(.23,1,.32,1), visibility 0s 140ms; }
        .back-top:focus-visible .back-top-label { opacity: 1; visibility: visible; transform: translateX(0); transition-delay: 0s; }
        @media (hover: hover) and (pointer: fine) {
            .back-top:hover { background: #fff; border-color: #88a9c9; }
            .back-top:hover .back-top-arrow { transform: translateY(-2px); }
            .back-top:hover .back-top-label { opacity: 1; visibility: visible; transform: translateX(0); transition-delay: 100ms; }
        }
        @media (max-width: 768px) {
            .back-top { width: 48px; height: 48px; right: calc(12px + env(safe-area-inset-right)); bottom: calc(16px + env(safe-area-inset-bottom)); }
        }
        @media (prefers-reduced-motion: reduce) {
            .back-top, .back-top-arrow, .back-top-label { transition: none; }
            .back-top, .back-top.visible, .back-top.visible:active { transform: translateY(calc(0px - var(--back-top-lift, 0px))); }
            .back-top:hover .back-top-arrow, .back-top-label { transform: none; }
        }

        /* ===== MOBILE ===== */
        @media (max-width: 1024px) {
            .nav-inner { padding: 0 24px; }
            .nav-links { gap: 20px; }
            .nav-cta { padding: 7px 16px; }
            .features-grid { grid-template-columns: repeat(2, 1fr); }
            .apps-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 768px) {
            .nav-cta { display: none; }
            .hamburger {
                display: flex;
                border-radius: 50%;
                -webkit-tap-highlight-color: transparent;
                transition: background-color 140ms ease, transform 140ms cubic-bezier(.16,1,.3,1);
            }
            .hamburger span {
                width: 20px;
                transition: transform 220ms cubic-bezier(.16,1,.3,1), opacity 140ms ease;
            }
            .hamburger.active { background: rgba(255,255,255,0.07); }
            .hamburger:active { transform: scale(0.94); }
            .hamburger:focus-visible { outline: 2px solid #fff; outline-offset: 3px; }
            .nav .nav-links {
                display: flex;
                position: fixed;
                inset: 76px 0 0 0;
                max-height: calc(100dvh - 76px);
                flex-direction: column;
                align-items: stretch;
                justify-content: flex-start;
                gap: 4px;
                padding: 16px max(24px, env(safe-area-inset-right)) max(24px, env(safe-area-inset-bottom)) max(24px, env(safe-area-inset-left));
                background: #000000;
                z-index: 999;
                overflow-y: auto;
                overscroll-behavior-y: contain;
                -webkit-overflow-scrolling: touch;
                opacity: 0;
                visibility: hidden;
                pointer-events: none;
                transform: translateY(-8px);
                transition: opacity 180ms ease, transform 180ms cubic-bezier(.16,1,.3,1), visibility 0s linear 180ms;
            }
            .nav .nav-links.mobile-open {
                opacity: 1;
                visibility: visible;
                pointer-events: auto;
                transform: translateY(0);
                transition: opacity 180ms ease, transform 240ms cubic-bezier(.16,1,.3,1), visibility 0s;
            }
            .nav .nav-links > li {
                flex: 0 0 auto;
                align-self: center;
                width: 100%;
                max-width: 440px;
                min-width: 0;
                text-align: center;
                opacity: 0;
                transform: translateY(-5px);
                transition: opacity 140ms ease, transform 180ms cubic-bezier(.16,1,.3,1);
            }
            .nav .nav-links.mobile-open > li {
                opacity: 1;
                transform: translateY(0);
                transition-duration: 200ms, 220ms;
                transition-delay: 35ms;
            }
            .nav .nav-links.mobile-open > li:first-child { transition-delay: 0s; }
            .nav .nav-links > li > a {
                display: flex;
                align-items: center;
                justify-content: center;
                min-height: 52px;
                font-size: 24px;
                font-weight: 600;
                color: #f5f5f7;
                line-height: 1.3;
                padding: 10px 12px;
                letter-spacing: 0.01em;
                border-radius: 10px;
                -webkit-tap-highlight-color: transparent;
                transition: color 140ms ease, background-color 140ms ease, transform 140ms cubic-bezier(.16,1,.3,1);
            }
            .nav .nav-links > li > a:active {
                background: rgba(255,255,255,0.07);
                transform: scale(0.98);
            }
            .nav .nav-links a.active {
                color: #ffb500;
            }
            .nav .nav-links a.active::after { display: none; }
            .nav .nav-links a[href$="#exhibition"] {
                color: #ffb500;
            }
            .nav .nav-links .nav-badge {
                font-size: 11px;
                line-height: 1.6;
                margin-left: 8px;
                padding: 2px 8px;
            }
            .nav .nav-links li.has-sub {
                display: flex;
                flex-direction: column;
                align-items: stretch;
                gap: 8px;
                margin-bottom: 12px;
                padding-bottom: 20px;
                border-bottom: 1px solid rgba(255,255,255,0.1);
            }
            .nav .nav-links li.has-sub > a { font-size: 26px; }
            .nav .nav-product-toggle { display: none; }
            .nav .nav-sub::before { display: none; }
            .nav .nav-links li.has-sub > a .caret { display: none; }
            /* 与桌面 hover / focus-within 规则同级，避免焦点触发横向位移。 */
            .nav .nav-links li.has-sub > .nav-sub {
                position: static;
                opacity: 1;
                visibility: visible;
                transform: none;
                transition: none;
                background: none;
                border: none;
                box-shadow: none;
                backdrop-filter: none;
                -webkit-backdrop-filter: none;
                display: grid;
                grid-template-columns: repeat(2, minmax(0, 1fr));
                gap: 6px 8px;
                width: 100%;
                min-width: 0;
                padding: 0;
                margin-top: 0;
                max-width: 440px;
            }
            .nav .nav-links .nav-sub li { min-width: 0; }
            .nav .nav-links .nav-sub li:last-child:nth-child(odd) { grid-column: 1 / -1; }
            .nav .nav-links .nav-sub a {
                justify-content: center;
                min-height: 50px;
                height: 100%;
                font-size: 14px;
                font-weight: 400;
                line-height: 1.45;
                color: rgba(245,245,247,0.85);
                padding: 10px;
                letter-spacing: 0;
                white-space: normal;
                overflow-wrap: anywhere;
                background: rgba(255,255,255,0.045);
                border: 1px solid rgba(255,255,255,0.09);
                border-radius: 10px;
                -webkit-tap-highlight-color: transparent;
                transition: color 140ms ease, background-color 140ms ease, border-color 140ms ease, transform 140ms cubic-bezier(.16,1,.3,1);
            }
            .nav .nav-links .nav-sub a:active {
                color: #fff;
                background: rgba(255,181,0,0.09);
                border-color: rgba(255,181,0,0.4);
                transform: scale(0.98);
            }
            .nav .nav-links .nav-sub a:focus-visible { outline-offset: 3px; }
            .nav .nav-links .nav-sub a small { display: none; }
            .nav.menu-instant,
            .nav.menu-instant .nav-links,
            .nav.menu-instant .nav-links *,
            .nav.menu-instant .nav-links > li,
            .nav.menu-instant .nav-links a,
            .nav.menu-instant .hamburger,
            .nav.menu-instant .hamburger span {
                transition: none !important;
            }
            @media (hover: hover) and (pointer: fine) {
                .hamburger:hover { background: rgba(255,255,255,0.1); }
                .nav .nav-links > li > a:hover { background: rgba(255,255,255,0.045); }
                .nav .nav-links .nav-sub a:hover {
                    color: #fff;
                    background: rgba(255,255,255,0.08);
                    border-color: rgba(255,255,255,0.18);
                }
            }
            .nav .nav-links .nav-sub a[aria-current="page"] {
                color: #ffcd52;
                background: rgba(255,181,0,0.09);
                border-color: rgba(255,181,0,0.75);
                box-shadow: none;
            }
            @media (prefers-reduced-motion: reduce) {
                .nav .nav-links,
                .nav .nav-links > li,
                .nav .nav-links a:active,
                .hamburger:active { transform: none; }
            }
            .hero { padding: 100px 20px 60px; }
            .hero-desc { font-size: 15px; }
            .hero-cta-group { flex-direction: column; align-items: center; width: 100%; }
            .cta-primary, .cta-secondary { width: 100%; max-width: 280px; justify-content: center; }
            section { padding: var(--section-pad-mobile) 20px; }
            .section-header { margin-bottom: 32px; }
            .feature-card { padding: 18px 0; }
            .app-card { padding: 22px 20px; }
            .footer-inner {
                flex-direction: column;
                justify-items: center;
                text-align: center;
                gap: 12px;
            }
            .footer-links { order: -1; }
        }
        @media (max-width: 640px) {
            .features-grid, .apps-grid { grid-template-columns: 1fr; }
            .grade-result { align-items: flex-start; flex-direction: column; gap: 4px; }
            .grade-result-actions { width: 100%; }
            .grade-results-heading { font-size: 18px; }
            .grade-search input { padding-left: 18px; }
            .features { padding-top: 56px; padding-bottom: 56px; }
        }