/* ==================== CSS 变量与全局重置 ==================== */
        :root {
            --accent: #0ea5e9;
            --accent-glow: #38bdf8;
            --accent-deep: #0369a1;
            --surface: #ffffff;
            --surface-alt: #f0f9ff;
            --card-bg: #f8fcff;
            --text-primary: #0c1929;
            --text-secondary: #334155;
            --text-muted: #64748b;
            --border: #e0f0fe;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.03);
            --shadow-md: 0 8px 24px rgba(14, 165, 233, 0.08);
            --shadow-lg: 0 20px 48px rgba(14, 165, 233, 0.12);
            --radius-sm: 10px;
            --radius: 16px;
            --radius-lg: 24px;
            --font-mono: 'SF Mono', 'Cascadia Code', 'Consolas', monospace;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', 'Noto Sans SC', system-ui, sans-serif;
            color: var(--text-primary);
            background: var(--surface);
            line-height: 1.6;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        /* ==================== 头部导航 ==================== */
        header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0.7rem clamp(1.5rem, 5vw, 6rem);
            background: rgba(255, 255, 255, 0.88);
            backdrop-filter: blur(14px) saturate(140%);
            -webkit-backdrop-filter: blur(14px) saturate(140%);
            border-bottom: 1px solid rgba(14, 165, 233, 0.08);
            position: sticky;
            top: 0;
            z-index: 1000;
            transition: box-shadow var(--transition);
        }
        header.scrolled {
            box-shadow: 0 2px 16px rgba(0, 0, 0, 0.05);
        }

        .logo-wrap {
            display: flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .logo-wrap:hover {
            transform: scale(1.03);
        }
        .logo-wrap img {
            height: 38px;
            width: auto;
            border-radius: 8px;
        }
        .logo-wrap .logo-text {
            font-weight: 800;
            font-size: 1.35rem;
            letter-spacing: -0.03em;
            background: linear-gradient(135deg, var(--accent) 0%, #0284c7 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        nav {
            display: flex;
            gap: 1.8rem;
            align-items: center;
        }
        nav a {
            text-decoration: none;
            color: var(--text-secondary);
            font-weight: 600;
            font-size: 0.9rem;
            position: relative;
            padding: 6px 2px;
            transition: color var(--transition);
            white-space: nowrap;
        }
        nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            width: 0;
            height: 2.5px;
            background: var(--accent);
            border-radius: 2px;
            transition: all var(--transition);
            transform: translateX(-50%);
        }
        nav a:hover,
        nav a.active {
            color: var(--accent);
        }
        nav a:hover::after,
        nav a.active::after {
            width: 80%;
        }

        .menu-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            padding: 6px;
            color: var(--text-primary);
            font-size: 1.5rem;
            line-height: 1;
        }

        /* ==================== Hero 区域 ==================== */
        .hero {
            padding: 5rem clamp(1.5rem, 5vw, 6rem) 4rem;
            text-align: center;
            position: relative;
            overflow: hidden;
            background:
                radial-gradient(ellipse 80% 60% at 50% 0%, rgba(14, 165, 233, 0.04) 0%, transparent 60%),
                radial-gradient(ellipse 40% 40% at 85% 100%, rgba(56, 189, 248, 0.04) 0%, transparent 60%),
                radial-gradient(ellipse 30% 30% at 15% 80%, rgba(2, 132, 199, 0.03) 0%, transparent 60%);
        }

        /* 微粒子动画 */
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            pointer-events: none;
            background-image:
                radial-gradient(2px 2px at 20% 30%, var(--accent-glow) 50%, transparent 100%),
                radial-gradient(2px 2px at 70% 55%, #0284c7 50%, transparent 100%),
                radial-gradient(1.5px 1.5px at 45% 20%, var(--accent) 50%, transparent 100%),
                radial-gradient(2.5px 2.5px at 80% 70%, var(--accent-glow) 50%, transparent 100%),
                radial-gradient(1px 1px at 10% 65%, #0c4a6e 50%, transparent 100%);
            opacity: 0.4;
            animation: gentleDrift 18s linear infinite;
        }
        @keyframes gentleDrift {
            0%, 100% { transform: translate(0, 0); }
            33% { transform: translate(6px, -4px); }
            66% { transform: translate(-4px, 6px); }
        }

        .hero-tag {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: linear-gradient(135deg, rgba(14, 165, 233, 0.08), rgba(56, 189, 248, 0.06));
            color: var(--accent-deep);
            padding: 8px 20px;
            border-radius: 99px;
            font-size: 0.85rem;
            font-weight: 700;
            letter-spacing: 0.02em;
            margin-bottom: 1.8rem;
            border: 1px solid rgba(14, 165, 233, 0.15);
            position: relative;
            z-index: 1;
        }
        .hero-tag .pulse-dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: #10b981;
            animation: pulse 2s ease-in-out infinite;
            display: inline-block;
        }
        @keyframes pulse {
            0%, 100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.5); }
            50% { box-shadow: 0 0 0 10px rgba(16, 185, 129, 0); }
        }

        .hero h1 {
            font-size: clamp(2.2rem, 5vw, 3.8rem);
            letter-spacing: -0.04em;
            line-height: 1.12;
            margin-bottom: 1.5rem;
            font-weight: 800;
            position: relative;
            z-index: 1;
            color: var(--text-primary);
        }
        .hero h1 .highlight {
            background: linear-gradient(135deg, var(--accent) 0%, #0369a1 80%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-subtitle {
            font-size: 1.15rem;
            color: var(--text-secondary);
            max-width: 720px;
            margin: 0 auto 2.8rem;
            position: relative;
            z-index: 1;
            line-height: 1.7;
        }

        .cta-group {
            display: flex;
            gap: 1rem;
            justify-content: center;
            flex-wrap: wrap;
            position: relative;
            z-index: 1;
        }
        .btn {
            padding: 13px 30px;
            border-radius: 99px;
            font-weight: 700;
            font-size: 0.95rem;
            text-decoration: none;
            transition: all var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 9px;
            cursor: pointer;
            letter-spacing: 0.01em;
            border: none;
        }
        .btn-primary {
            background: var(--accent);
            color: #fff;
            box-shadow: 0 8px 24px rgba(14, 165, 233, 0.3);
        }
        .btn-primary:hover {
            background: var(--accent-deep);
            transform: translateY(-3px);
            box-shadow: 0 14px 32px rgba(14, 165, 233, 0.4);
        }
        .btn-secondary {
            background: var(--surface);
            color: var(--text-primary);
            border: 1.5px solid var(--border);
        }
        .btn-secondary:hover {
            background: #f0f9ff;
            border-color: var(--accent-glow);
            transform: translateY(-2px);
        }

        /* 全平台图标列表 */
        .platform-icons {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 2rem;
            margin-top: 2.5rem;
            position: relative;
            z-index: 1;
            color: var(--text-muted);
            font-weight: 600;
            font-size: 0.9rem;
        }
        .platform-icons span {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 6px 12px;
            border-radius: 20px;
            background: rgba(14, 165, 233, 0.04);
            transition: all var(--transition);
        }
        .platform-icons span i {
            font-size: 1.2rem;
            color: var(--accent);
        }

        /* Dashboard 预览 */
        .hero-dashboard {
            margin-top: 4rem;
            max-width: 960px;
            margin-inline: auto;
            position: relative;
            z-index: 1;
        }
        .dashboard-mock {
            background: #0f172a;
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid #1e293b;
            box-shadow: var(--shadow-lg);
        }
        .dashboard-header-bar {
            background: #1e293b;
            padding: 12px 18px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .dashboard-dot {
            width: 11px;
            height: 11px;
            border-radius: 50%;
        }
        .dashboard-dot.red { background: #ff5f56; }
        .dashboard-dot.yellow { background: #ffbd2e; }
        .dashboard-dot.green { background: #27c93f; }
        .dashboard-title-bar {
            flex: 1;
            text-align: center;
            font-size: 0.78rem;
            color: #94a3b8;
            font-family: var(--font-mono);
        }
        .dashboard-body {
            padding: 28px 24px;
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
        }
        .dashboard-stat {
            flex: 1;
            min-width: 130px;
            background: #1e293b;
            border-radius: var(--radius-sm);
            padding: 18px 16px;
            text-align: center;
            border: 1px solid #334155;
            transition: all var(--transition);
        }
        .dashboard-stat:hover {
            border-color: var(--accent-glow);
            box-shadow: 0 0 20px rgba(56, 189, 248, 0.15);
            transform: translateY(-3px);
        }
        .dashboard-stat .stat-value {
            font-size: 2rem;
            font-weight: 800;
            color: #e2e8f0;
            font-family: var(--font-mono);
        }
        .dashboard-stat .stat-value.accent {
            color: var(--accent-glow);
        }
        .dashboard-stat .stat-label {
            font-size: 0.75rem;
            color: #94a3b8;
            margin-top: 4px;
            text-transform: uppercase;
            letter-spacing: 0.05em;
            font-weight: 600;
        }
        .dashboard-graph {
            flex: 2;
            min-width: 240px;
            background: #1e293b;
            border-radius: var(--radius-sm);
            padding: 18px 16px;
            border: 1px solid #334155;
            display: flex;
            align-items: flex-end;
            gap: 8px;
        }
        .graph-bar {
            flex: 1;
            border-radius: 4px 4px 0 0;
            background: linear-gradient(180deg, var(--accent-glow), rgba(56, 189, 248, 0.2));
            animation: barBreathe 3s ease-in-out infinite;
            min-height: 20px;
        }
        .graph-bar:nth-child(1) { height: 65%; animation-delay: 0s; }
        .graph-bar:nth-child(2) { height: 88%; animation-delay: 0.2s; }
        .graph-bar:nth-child(3) { height: 45%; animation-delay: 0.4s; }
        .graph-bar:nth-child(4) { height: 92%; animation-delay: 0.6s; }
        .graph-bar:nth-child(5) { height: 58%; animation-delay: 0.8s; }
        .graph-bar:nth-child(6) { height: 76%; animation-delay: 1s; }
        .graph-bar:nth-child(7) { height: 40%; animation-delay: 1.2s; }
        .graph-bar:nth-child(8) { height: 82%; animation-delay: 1.4s; }
        @keyframes barBreathe {
            0%, 100% { opacity: 0.7; }
            50% { opacity: 1; }
        }

        /* 视频区域 */
        .video-wrapper {
            margin-top: 3rem;
            max-width: 960px;
            margin-inline: auto;
            aspect-ratio: 16/9;
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 3px solid #fff;
            box-shadow: var(--shadow-md);
            background: #0f172a;
            position: relative;
            z-index: 1;
        }
        .video-wrapper iframe {
            width: 100%;
            height: 100%;
            border: none;
        }

        /* ==================== 内容区块通用 ==================== */
        .content-section {
            padding: 5rem clamp(1.5rem, 5vw, 6rem);
            max-width: 1200px;
            margin: 0 auto;
        }
        .section-header {
            text-align: center;
            margin-bottom: 3.5rem;
        }
        .section-header h2 {
            font-size: clamp(1.8rem, 3.5vw, 2.5rem);
            letter-spacing: -0.03em;
            margin-bottom: 0.8rem;
            font-weight: 800;
        }
        .section-sub {
            color: var(--text-muted);
            font-size: 1.05rem;
            max-width: 600px;
            margin: 0 auto;
        }
        .section-divider {
            width: 50px;
            height: 4px;
            background: var(--accent);
            border-radius: 2px;
            margin: 1rem auto 0;
            opacity: 0.6;
        }

        /* 三列卡片 */
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 1.8rem;
        }
        .card {
            padding: 2.2rem 1.8rem;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            background: var(--card-bg);
            transition: all var(--transition);
            position: relative;
            overflow: hidden;
        }
        .card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--accent), #38bdf8);
            transform: scaleX(0);
            transition: transform var(--transition);
            border-radius: 0 0 2px 2px;
        }
        .card:hover::before {
            transform: scaleX(1);
        }
        .card:hover {
            transform: translateY(-6px);
            background: #fff;
            box-shadow: var(--shadow-lg);
            border-color: rgba(14, 165, 233, 0.25);
        }
        .card-icon {
            font-size: 2.4rem;
            color: var(--accent);
            margin-bottom: 1.2rem;
            display: block;
            transition: transform var(--transition);
        }
        .card:hover .card-icon {
            transform: scale(1.12);
        }
        .card h3 {
            margin-bottom: 0.7rem;
            font-size: 1.25rem;
            font-weight: 700;
            letter-spacing: -0.02em;
        }
        .card p {
            color: var(--text-secondary);
            font-size: 0.93rem;
            line-height: 1.65;
        }

        /* 品牌叙事面板 */
        .brand-panel {
            background: #0f172a;
            color: #cbd5e1;
            padding: 3.5rem clamp(2rem, 5vw, 4rem);
            border-radius: var(--radius-lg);
            margin: 3.5rem 0;
            position: relative;
            overflow: hidden;
        }
        .brand-panel::after {
            content: 'CLASH';
            position: absolute;
            top: -10px;
            right: -20px;
            font-size: 7rem;
            font-weight: 900;
            color: rgba(255, 255, 255, 0.025);
            pointer-events: none;
            letter-spacing: 0.15em;
            line-height: 1;
        }
        .brand-panel h2 {
            color: #fff;
            margin-bottom: 1.2rem;
            font-size: 2rem;
            letter-spacing: -0.03em;
            position: relative;
            z-index: 1;
        }
        .brand-panel p {
            color: #94a3b8;
            font-size: 1.05rem;
            max-width: 750px;
            position: relative;
            z-index: 1;
            line-height: 1.75;
        }
        .brand-highlights {
            display: flex;
            flex-wrap: wrap;
            gap: 2rem;
            margin-top: 2rem;
            position: relative;
            z-index: 1;
        }
        .highlight-item {
            display: flex;
            align-items: center;
            gap: 10px;
            color: #cbd5e1;
            font-weight: 600;
            font-size: 0.95rem;
        }
        .highlight-item i {
            color: var(--accent-glow);
            font-size: 1.3rem;
        }

        /* 双列信息块 */
        .grid-2 {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin-top: 2rem;
        }
        .info-block {
            padding: 1.8rem;
            border-left: 3px solid var(--accent);
            background: var(--surface-alt);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            transition: all var(--transition);
        }
        .info-block:hover {
            background: #e0f2fe;
            border-left-color: #0284c7;
            box-shadow: var(--shadow-sm);
        }
        .info-block h4 {
            margin-bottom: 0.6rem;
            font-size: 1.1rem;
            font-weight: 700;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .info-block h4 i {
            color: var(--accent);
            font-size: 1rem;
        }
        .info-block p {
            color: var(--text-secondary);
            font-size: 0.9rem;
            line-height: 1.65;
        }

        /* 标签云 */
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
            margin-top: 2.5rem;
        }
        .tag {
            padding: 8px 18px;
            border-radius: 99px;
            background: var(--surface-alt);
            border: 1px solid var(--border);
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--text-secondary);
            transition: all var(--transition);
        }
        .tag:hover {
            background: #e0f2fe;
            border-color: var(--accent-glow);
            color: var(--accent);
            transform: translateY(-2px);
            box-shadow: var(--shadow-sm);
        }

        /* 页脚 */
        footer {
            background: #0c1929;
            color: #94a3b8;
            padding: 4rem clamp(1.5rem, 5vw, 6rem) 2rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 3rem;
            max-width: 1200px;
            margin: 0 auto;
        }
        .footer-brand h4 {
            color: #fff;
            margin-bottom: 0.8rem;
            font-size: 1.2rem;
        }
        .footer-brand p {
            font-size: 0.9rem;
            line-height: 1.65;
            opacity: 0.8;
        }
        .footer-social {
            display: flex;
            gap: 1rem;
            margin-top: 1.2rem;
            font-size: 1.2rem;
        }
        .footer-social a {
            color: #94a3b8;
            transition: color var(--transition);
            text-decoration: none;
        }
        .footer-social a:hover {
            color: var(--accent-glow);
        }
        .footer-links h4 {
            color: #fff;
            margin-bottom: 1rem;
            font-size: 0.95rem;
            letter-spacing: 0.03em;
            text-transform: uppercase;
        }
        .footer-links a {
            display: block;
            color: #94a3b8;
            text-decoration: none;
            margin-bottom: 0.65rem;
            font-size: 0.9rem;
            transition: color var(--transition);
            padding-left: 14px;
            position: relative;
        }
        .footer-links a::before {
            content: '→';
            position: absolute;
            left: 0;
            opacity: 0;
            transition: all var(--transition);
            color: var(--accent-glow);
        }
        .footer-links a:hover {
            color: #fff;
            padding-left: 18px;
        }
        .footer-links a:hover::before {
            opacity: 1;
        }
        .footer-bottom {
            border-top: 1px solid #1e293b;
            margin-top: 3rem;
            padding-top: 1.8rem;
            text-align: center;
            font-size: 0.82rem;
            max-width: 1200px;
            margin-inline: auto;
            opacity: 0.7;
            line-height: 1.7;
        }

        /* ==================== 响应式 ==================== */
        @media (max-width: 900px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 2rem;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
            .dashboard-body {
                flex-direction: column;
            }
            .dashboard-graph {
                min-height: 150px;
            }
        }

        @media (max-width: 768px) {
            header {
                flex-wrap: wrap;
                padding: 0.8rem 1.2rem;
                gap: 0.6rem;
            }
            nav {
                gap: 0.8rem;
                flex-wrap: wrap;
                justify-content: center;
                width: 100%;
                order: 3;
                padding-top: 0.3rem;
            }
            .menu-toggle {
                display: block;
                order: 2;
            }
            .logo-wrap {
                order: 1;
            }
            .hero {
                padding: 3rem 1.2rem 2.5rem;
            }
            .hero h1 {
                font-size: 1.9rem;
            }
            .hero-subtitle {
                font-size: 1rem;
            }
            .grid-3 {
                grid-template-columns: 1fr;
                gap: 1.2rem;
            }
            .grid-2 {
                grid-template-columns: 1fr;
            }
            .brand-panel {
                padding: 2rem 1.5rem;
            }
            .brand-panel::after {
                font-size: 3.5rem;
                top: 0;
                right: -5px;
            }
            .brand-panel h2 {
                font-size: 1.5rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
            .cta-group {
                flex-direction: column;
                align-items: center;
            }
            .btn {
                width: 100%;
                justify-content: center;
                max-width: 300px;
            }
            .dashboard-body {
                padding: 16px 10px;
                gap: 8px;
            }
            .dashboard-stat .stat-value {
                font-size: 1.4rem;
            }
            .dashboard-graph {
                min-height: 100px;
            }
            .video-wrapper {
                margin-top: 2rem;
                border-radius: var(--radius);
            }
        }

        @media (max-width: 480px) {
            .hero h1 {
                font-size: 1.6rem;
            }
            .hero-tag {
                font-size: 0.75rem;
                padding: 6px 14px;
            }
            nav a {
                font-size: 0.76rem;
            }
            .card {
                padding: 1.5rem 1.2rem;
            }
            .dashboard-stat .stat-value {
                font-size: 1.2rem;
            }
            .section-header h2 {
                font-size: 1.5rem;
            }
        }

        @media print {
            header, footer, .video-wrapper, .cta-group, .hero-dashboard {
                display: none;
            }
            body {
                font-size: 14px;
                color: #000;
                background: #fff;
            }
            .hero {
                padding: 1rem 0;
                background: none;
            }
            .hero h1 {
                font-size: 1.8rem;
                color: #000;
            }
        }