/* roulang page: index */
:root {
            --primary-deep: #0A0E27;
            --primary-dark: #0d1235;
            --accent-cyan: #00E5FF;
            --accent-coral: #FF5E3A;
            --text-primary: #e8eaef;
            --text-secondary: #b0b8c8;
            --text-muted: #6e7790;
            --border-subtle: rgba(255, 255, 255, 0.1);
            --border-glow: rgba(0, 229, 255, 0.4);
            --card-bg: rgba(255, 255, 255, 0.04);
            --card-bg-hover: rgba(255, 255, 255, 0.07);
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
            --shadow-glow: 0 0 20px rgba(0, 229, 255, 0.6);
            --shadow-glow-strong: 0 0 40px rgba(0, 229, 255, 0.85);
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --radius-xl: 32px;
            --spacing-xs: 8px;
            --spacing-sm: 16px;
            --spacing-md: 24px;
            --spacing-lg: 40px;
            --spacing-xl: 60px;
            --spacing-2xl: 80px;
            --spacing-3xl: 100px;
            --nav-height: 72px;
            --font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --transition-fast: 0.2s ease;
            --transition-normal: 0.3s ease;
            --transition-slow: 0.5s ease;
        }

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

        html {
            scroll-behavior: smooth;
            scroll-padding-top: var(--nav-height);
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-family);
            background: var(--primary-deep);
            color: var(--text-primary);
            line-height: 1.8;
            min-height: 100vh;
            overflow-x: hidden;
            background-image:
                radial-gradient(ellipse at 20% 10%, rgba(0, 229, 255, 0.06) 0%, transparent 60%),
                radial-gradient(ellipse at 75% 40%, rgba(255, 94, 58, 0.04) 0%, transparent 55%),
                radial-gradient(ellipse at 50% 70%, rgba(0, 229, 255, 0.03) 0%, transparent 50%);
            background-attachment: fixed;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-normal);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            outline: none;
            transition: all var(--transition-normal);
        }

        button:focus-visible,
        a:focus-visible {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 3px;
            border-radius: var(--radius-sm);
        }

        input:focus-visible {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }

        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 var(--spacing-md);
        }

        @media (min-width: 1400px) {
            .container {
                max-width: 1320px;
            }
        }

        /* ========== 导航 ========== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--nav-height);
            background: linear-gradient(180deg, rgba(10, 14, 39, 0.95) 0%, rgba(10, 14, 39, 0.85) 100%);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            transition: background var(--transition-normal), box-shadow var(--transition-normal);
        }

        .header.scrolled {
            background: rgba(10, 14, 39, 0.98);
            box-shadow: 0 4px 24px rgba(0, 0, 0, 0.5);
            border-bottom-color: rgba(255, 255, 255, 0.1);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 var(--spacing-md);
        }

        @media (min-width: 1400px) {
            .header-inner {
                max-width: 1320px;
            }
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.4rem;
            font-weight: 800;
            color: #ffffff;
            letter-spacing: 0.04em;
            white-space: nowrap;
            z-index: 1001;
        }

        .logo-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--accent-cyan), #00b8d4);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            color: #0A0E27;
            font-weight: 900;
            flex-shrink: 0;
        }

        .nav-list {
            display: flex;
            list-style: none;
            gap: var(--spacing-sm);
            align-items: center;
        }

        .nav-list li a {
            display: inline-block;
            padding: 8px 16px;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            border-radius: 6px;
            position: relative;
            transition: color var(--transition-normal), background var(--transition-normal);
            white-space: nowrap;
        }

        .nav-list li a::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%) scaleX(0);
            width: 60%;
            height: 2px;
            background: var(--accent-cyan);
            border-radius: 2px;
            box-shadow: 0 0 10px rgba(0, 229, 255, 0.7);
            transition: transform var(--transition-normal);
        }

        .nav-list li a:hover,
        .nav-list li a.active {
            color: #ffffff;
        }

        .nav-list li a:hover::after,
        .nav-list li a.active::after {
            transform: translateX(-50%) scaleX(1);
        }

        .nav-list li a.nav-cta {
            background: linear-gradient(135deg, var(--accent-cyan), #00b8d4);
            color: #0A0E27;
            font-weight: 700;
            padding: 10px 20px;
            border-radius: 24px;
            box-shadow: var(--shadow-glow);
            transition: all var(--transition-normal);
        }

        .nav-list li a.nav-cta:hover {
            box-shadow: var(--shadow-glow-strong);
            transform: translateY(-1px);
            color: #0A0E27;
        }
        .nav-list li a.nav-cta::after {
            display: none;
        }

        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            z-index: 1001;
            padding: 8px;
            background: none;
            border: none;
        }

        .hamburger span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: #ffffff;
            border-radius: 2px;
            transition: all var(--transition-normal);
            box-shadow: 0 0 6px rgba(0, 229, 255, 0.4);
        }

        .hamburger.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        @media (max-width: 768px) {
            .nav-list {
                position: fixed;
                top: 0;
                left: 0;
                right: 0;
                bottom: 0;
                background: rgba(10, 14, 39, 0.97);
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
                flex-direction: column;
                justify-content: center;
                align-items: center;
                gap: var(--spacing-md);
                transform: translateY(-100%);
                opacity: 0;
                transition: all var(--transition-slow);
                z-index: 999;
            }
            .nav-list.open {
                transform: translateY(0);
                opacity: 1;
            }
            .nav-list li a {
                font-size: 1.3rem;
                padding: 12px 24px;
            }
            .nav-list li a.nav-cta {
                font-size: 1.2rem;
                padding: 14px 28px;
                border-radius: 28px;
            }
            .hamburger {
                display: flex;
            }
        }

        /* ========== Hero ========== */
        .hero {
            position: relative;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding-top: var(--nav-height);
            overflow: hidden;
            background:
                radial-gradient(ellipse at 30% 25%, rgba(0, 229, 255, 0.08) 0%, transparent 55%),
                radial-gradient(ellipse at 70% 60%, rgba(255, 94, 58, 0.05) 0%, transparent 50%),
                linear-gradient(180deg, #0A0E27 0%, #0d1235 40%, #0A0E27 100%);
        }

        .hero-bg-image {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.15;
            z-index: 0;
            filter: saturate(0.7) brightness(0.6);
        }

        .hero-canvas {
            position: absolute;
            inset: 0;
            z-index: 1;
            pointer-events: none;
        }

        .hero-content {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 800px;
            padding: 0 var(--spacing-md);
        }

        .hero-badge {
            display: inline-block;
            padding: 6px 18px;
            border: 1px solid rgba(0, 229, 255, 0.35);
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 500;
            color: var(--accent-cyan);
            letter-spacing: 0.06em;
            margin-bottom: var(--spacing-md);
            background: rgba(0, 229, 255, 0.06);
            animation: fadeInUp 0.8s ease forwards;
        }

        .hero h1 {
            font-size: 3.4rem;
            font-weight: 800;
            line-height: 1.2;
            color: #ffffff;
            margin-bottom: var(--spacing-md);
            letter-spacing: 0.02em;
            animation: fadeInUp 0.8s ease 0.15s forwards;
            opacity: 0;
        }

        .hero h1 .highlight {
            background: linear-gradient(135deg, var(--accent-cyan), #5ef7ff);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            position: relative;
        }

        .hero-subtitle {
            font-size: 1.15rem;
            color: var(--text-secondary);
            line-height: 1.7;
            max-width: 600px;
            margin: 0 auto var(--spacing-lg);
            font-weight: 400;
            animation: fadeInUp 0.8s ease 0.3s forwards;
            opacity: 0;
        }

        .hero-buttons {
            display: flex;
            gap: var(--spacing-sm);
            justify-content: center;
            flex-wrap: wrap;
            animation: fadeInUp 0.8s ease 0.45s forwards;
            opacity: 0;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            font-size: 1rem;
            font-weight: 700;
            border-radius: 28px;
            background: linear-gradient(135deg, var(--accent-cyan), #00b8d4);
            color: #0A0E27;
            box-shadow: var(--shadow-glow);
            transition: all var(--transition-normal);
            letter-spacing: 0.03em;
            white-space: nowrap;
        }
        .btn-primary:hover {
            box-shadow: var(--shadow-glow-strong);
            transform: translateY(-2px);
            color: #0A0E27;
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: var(--shadow-glow);
        }

        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            font-size: 1rem;
            font-weight: 600;
            border-radius: 28px;
            background: transparent;
            color: #ffffff;
            border: 1.5px solid rgba(255, 255, 255, 0.3);
            transition: all var(--transition-normal);
            letter-spacing: 0.03em;
            white-space: nowrap;
        }
        .btn-outline:hover {
            border-color: var(--accent-cyan);
            box-shadow: 0 0 24px rgba(0, 229, 255, 0.35);
            color: var(--accent-cyan);
        }
        .btn-outline:active {
            transform: translateY(0);
        }

        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        @media (max-width: 768px) {
            .hero h1 {
                font-size: 2.1rem;
                letter-spacing: 0.01em;
            }
            .hero-subtitle {
                font-size: 0.95rem;
            }
            .btn-primary,
            .btn-outline {
                padding: 12px 24px;
                font-size: 0.9rem;
                border-radius: 24px;
                width: 100%;
                justify-content: center;
            }
            .hero-buttons {
                flex-direction: column;
                align-items: stretch;
                gap: 12px;
            }
            .hero {
                min-height: 90vh;
                padding-top: calc(var(--nav-height) + 20px);
            }
        }

        /* ========== 通用区块 ========== */
        .section {
            padding: var(--spacing-3xl) 0;
            position: relative;
            z-index: 1;
        }

        .section-label {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.08em;
            color: var(--accent-cyan);
            text-transform: uppercase;
            margin-bottom: var(--spacing-xs);
        }

        .section-title {
            font-size: 2.3rem;
            font-weight: 800;
            color: #ffffff;
            margin-bottom: var(--spacing-sm);
            letter-spacing: 0.02em;
            line-height: 1.3;
        }

        .section-desc {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 650px;
            line-height: 1.7;
            margin-bottom: var(--spacing-lg);
        }

        @media (max-width: 768px) {
            .section {
                padding: var(--spacing-2xl) 0;
            }
            .section-title {
                font-size: 1.7rem;
            }
            .section-desc {
                font-size: 0.9rem;
            }
        }

        /* ========== 功能分组 - 非对称栅格 ========== */
        #features {
            background: transparent;
        }

        .features-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            grid-template-rows: auto auto;
            gap: var(--spacing-md);
            align-items: stretch;
        }

        .feature-card {
            background: var(--card-bg);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: var(--spacing-lg);
            transition: all var(--transition-normal);
            position: relative;
            overflow: hidden;
            display: flex;
            flex-direction: column;
            box-shadow: var(--shadow-card);
        }

        .feature-card:hover {
            background: var(--card-bg-hover);
            border-color: var(--border-glow);
            transform: translateY(-4px);
            box-shadow: 0 16px 48px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(0, 229, 255, 0.2) inset;
        }

        .feature-card.feature-large {
            grid-column: 1 / -1;
            flex-direction: row;
            gap: var(--spacing-lg);
            align-items: center;
            padding: 0;
            overflow: hidden;
            min-height: 320px;
        }

        .feature-card.feature-large .feature-image-wrap {
            flex: 0 0 48%;
            height: 100%;
            min-height: 320px;
            overflow: hidden;
            border-radius: var(--radius-md) 0 0 var(--radius-md);
        }

        .feature-card.feature-large .feature-image-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-slow);
        }

        .feature-card.feature-large:hover .feature-image-wrap img {
            transform: scale(1.05);
        }

        .feature-card.feature-large .feature-body {
            flex: 1;
            padding: var(--spacing-lg);
        }

        .feature-card.feature-tall {
            grid-row: span 1;
            min-height: 380px;
        }

        .feature-card .feature-icon {
            width: 48px;
            height: 48px;
            border-radius: var(--radius-sm);
            background: rgba(0, 229, 255, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin-bottom: var(--spacing-sm);
            color: var(--accent-cyan);
            flex-shrink: 0;
        }

        .feature-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            color: #ffffff;
            margin-bottom: var(--spacing-xs);
            letter-spacing: 0.02em;
        }

        .feature-card p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.7;
            flex-grow: 1;
        }

        .feature-card .feature-image-wrap {
            border-radius: var(--radius-sm);
            overflow: hidden;
            margin-bottom: var(--spacing-sm);
            flex-shrink: 0;
        }

        .feature-card .feature-image-wrap img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            transition: transform var(--transition-slow);
        }

        .feature-card:hover .feature-image-wrap img {
            transform: scale(1.04);
        }

        @media (max-width: 768px) {
            .features-grid {
                grid-template-columns: 1fr;
                gap: var(--spacing-sm);
            }
            .feature-card.feature-large {
                grid-column: 1;
                flex-direction: column;
                min-height: auto;
            }
            .feature-card.feature-large .feature-image-wrap {
                flex: 0 0 auto;
                width: 100%;
                min-height: 200px;
                border-radius: var(--radius-md) var(--radius-md) 0 0;
            }
            .feature-card.feature-large .feature-body {
                padding: var(--spacing-md);
            }
            .feature-card.feature-tall {
                min-height: auto;
            }
            .feature-card {
                backdrop-filter: none;
                -webkit-backdrop-filter: none;
                background: rgba(13, 18, 53, 0.85);
            }
            .feature-card .feature-image-wrap img {
                height: 160px;
            }
        }

        /* ========== 使用场景 - 横向滚动 ========== */
        #scenarios {
            background: transparent;
        }

        .scenarios-scroll {
            display: flex;
            gap: var(--spacing-md);
            overflow-x: auto;
            scroll-snap-type: x mandatory;
            -webkit-overflow-scrolling: touch;
            padding-bottom: var(--spacing-sm);
            scrollbar-width: thin;
            scrollbar-color: rgba(0, 229, 255, 0.3) transparent;
        }

        .scenarios-scroll::-webkit-scrollbar {
            height: 6px;
        }
        .scenarios-scroll::-webkit-scrollbar-track {
            background: transparent;
            border-radius: 3px;
        }
        .scenarios-scroll::-webkit-scrollbar-thumb {
            background: rgba(0, 229, 255, 0.3);
            border-radius: 3px;
        }

        .scenario-card {
            flex: 0 0 340px;
            scroll-snap-align: start;
            background: var(--card-bg);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition-normal);
            box-shadow: var(--shadow-card);
            flex-shrink: 0;
        }

        .scenario-card:hover {
            border-color: var(--border-glow);
            transform: translateY(-4px);
            box-shadow: 0 16px 40px rgba(0, 0, 0, 0.5);
        }

        .scenario-card .scenario-image {
            width: 100%;
            height: 220px;
            overflow: hidden;
        }

        .scenario-card .scenario-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-slow);
        }

        .scenario-card:hover .scenario-image img {
            transform: scale(1.06);
        }

        .scenario-card .scenario-body {
            padding: var(--spacing-md);
        }

        .scenario-card h4 {
            font-size: 1.1rem;
            font-weight: 700;
            color: #ffffff;
            margin-bottom: 6px;
        }

        .scenario-card p {
            font-size: 0.85rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        @media (max-width: 768px) {
            .scenarios-scroll {
                flex-direction: column;
                overflow-x: visible;
                gap: var(--spacing-sm);
            }
            .scenario-card {
                flex: 0 0 auto;
                width: 100%;
                backdrop-filter: none;
                -webkit-backdrop-filter: none;
                background: rgba(13, 18, 53, 0.85);
            }
            .scenario-card .scenario-image {
                height: 180px;
            }
        }

        /* ========== 成功案例 ========== */
        #cases {
            background: transparent;
        }

        .cases-stats {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--spacing-md);
            margin-bottom: var(--spacing-xl);
        }

        .stat-card {
            background: var(--card-bg);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: var(--spacing-lg);
            text-align: center;
            transition: all var(--transition-normal);
            box-shadow: var(--shadow-card);
        }

        .stat-card:hover {
            border-color: var(--border-glow);
            transform: translateY(-3px);
        }

        .stat-card .stat-number {
            font-size: 2.8rem;
            font-weight: 900;
            color: var(--accent-coral);
            line-height: 1;
            margin-bottom: 8px;
            letter-spacing: 0.02em;
        }

        .stat-card .stat-label {
            font-size: 0.9rem;
            color: var(--text-secondary);
            font-weight: 500;
        }

        .partner-logos {
            display: flex;
            flex-wrap: wrap;
            gap: var(--spacing-lg);
            justify-content: center;
            align-items: center;
            padding: var(--spacing-lg) 0;
        }

        .partner-logo-item {
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-muted);
            letter-spacing: 0.04em;
            transition: all var(--transition-normal);
            padding: 10px 20px;
            border-radius: var(--radius-sm);
            cursor: default;
            white-space: nowrap;
        }

        .partner-logo-item:hover {
            color: #ffffff;
            text-shadow: 0 0 12px rgba(0, 229, 255, 0.5);
        }

        @media (max-width: 768px) {
            .cases-stats {
                grid-template-columns: repeat(2, 1fr);
                gap: var(--spacing-sm);
            }
            .stat-card {
                padding: var(--spacing-md);
                backdrop-filter: none;
                -webkit-backdrop-filter: none;
                background: rgba(13, 18, 53, 0.85);
            }
            .stat-card .stat-number {
                font-size: 2rem;
            }
            .partner-logos {
                gap: var(--spacing-sm);
            }
            .partner-logo-item {
                font-size: 0.85rem;
                padding: 8px 14px;
            }
        }

        @media (max-width: 520px) {
            .cases-stats {
                grid-template-columns: 1fr 1fr;
            }
            .stat-card .stat-number {
                font-size: 1.6rem;
            }
            .stat-card .stat-label {
                font-size: 0.75rem;
            }
        }

        /* ========== 价格/CTA ========== */
        #pricing {
            background: transparent;
        }

        .pricing-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--spacing-md);
            align-items: stretch;
        }

        .pricing-card {
            background: var(--card-bg);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: var(--spacing-lg);
            text-align: center;
            transition: all var(--transition-normal);
            box-shadow: var(--shadow-card);
            position: relative;
            display: flex;
            flex-direction: column;
        }

        .pricing-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 16px 40px rgba(0, 0, 0, 0.5);
        }

        .pricing-card.featured {
            border-color: var(--accent-cyan);
            box-shadow: var(--shadow-card), 0 0 0 1px rgba(0, 229, 255, 0.3);
            transform: scale(1.03);
            z-index: 2;
            background: rgba(0, 229, 255, 0.04);
        }

        .pricing-card.featured:hover {
            transform: scale(1.03) translateY(-4px);
            border-color: var(--accent-cyan);
            box-shadow: 0 20px 50px rgba(0, 0, 0, 0.55), 0 0 30px rgba(0, 229, 255, 0.25);
        }

        .pricing-badge {
            position: absolute;
            top: -14px;
            left: 50%;
            transform: translateX(-50%);
            background: linear-gradient(135deg, var(--accent-cyan), #00b8d4);
            color: #0A0E27;
            font-size: 0.8rem;
            font-weight: 700;
            padding: 5px 16px;
            border-radius: 14px;
            letter-spacing: 0.04em;
            white-space: nowrap;
            box-shadow: 0 0 16px rgba(0, 229, 255, 0.5);
        }

        .pricing-card h4 {
            font-size: 1.3rem;
            font-weight: 700;
            color: #ffffff;
            margin-bottom: 8px;
            margin-top: var(--spacing-xs);
        }

        .pricing-card .price {
            font-size: 2.6rem;
            font-weight: 900;
            color: var(--accent-coral);
            margin-bottom: var(--spacing-sm);
            letter-spacing: 0.02em;
        }

        .pricing-card .price span {
            font-size: 0.9rem;
            font-weight: 400;
            color: var(--text-muted);
        }

        .pricing-features {
            list-style: none;
            text-align: left;
            margin-bottom: var(--spacing-md);
            flex-grow: 1;
        }

        .pricing-features li {
            padding: 8px 0;
            font-size: 0.9rem;
            color: var(--text-secondary);
            border-bottom: 1px solid rgba(255, 255, 255, 0.04);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .pricing-features li::before {
            content: '✓';
            color: var(--accent-cyan);
            font-weight: 700;
            flex-shrink: 0;
        }

        .pricing-card .btn-primary {
            width: 100%;
            justify-content: center;
            margin-top: auto;
        }

        @media (max-width: 768px) {
            .pricing-grid {
                grid-template-columns: 1fr;
                gap: var(--spacing-lg);
            }
            .pricing-card.featured {
                transform: scale(1);
            }
            .pricing-card.featured:hover {
                transform: scale(1) translateY(-4px);
            }
            .pricing-card {
                backdrop-filter: none;
                -webkit-backdrop-filter: none;
                background: rgba(13, 18, 53, 0.85);
            }
        }

        /* ========== FAQ ========== */
        #faq {
            background: transparent;
        }

        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            transition: all var(--transition-normal);
        }

        .faq-question {
            width: 100%;
            background: none;
            border: none;
            text-align: left;
            padding: var(--spacing-md) 0;
            font-size: 1.05rem;
            font-weight: 600;
            color: #ffffff;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: var(--spacing-sm);
            font-family: var(--font-family);
            letter-spacing: 0.02em;
            transition: color var(--transition-normal);
        }

        .faq-question:hover {
            color: var(--accent-cyan);
        }

        .faq-icon {
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: rgba(0, 229, 255, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--accent-cyan);
            flex-shrink: 0;
            transition: all var(--transition-normal);
        }

        .faq-item.open .faq-icon {
            background: rgba(0, 229, 255, 0.2);
            transform: rotate(45deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow), padding var(--transition-normal);
            color: var(--text-secondary);
            font-size: 0.9rem;
            line-height: 1.7;
            padding: 0 var(--spacing-sm);
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 var(--spacing-sm) var(--spacing-md);
        }

        @media (max-width: 768px) {
            .faq-question {
                font-size: 0.95rem;
                padding: var(--spacing-sm) 0;
            }
            .faq-icon {
                width: 28px;
                height: 28px;
                font-size: 1rem;
            }
        }

        /* ========== 页脚 ========== */
        .footer {
            background: #070a1f;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            padding: var(--spacing-2xl) 0 var(--spacing-md);
            position: relative;
            z-index: 1;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: var(--spacing-xl);
            margin-bottom: var(--spacing-lg);
        }

        .footer-brand .footer-logo {
            font-size: 1.3rem;
            font-weight: 800;
            color: #ffffff;
            margin-bottom: var(--spacing-xs);
            letter-spacing: 0.03em;
        }

        .footer-brand p {
            font-size: 0.85rem;
            color: var(--text-muted);
            line-height: 1.7;
            max-width: 300px;
        }

        .footer-links h5 {
            font-size: 0.9rem;
            font-weight: 700;
            color: #ffffff;
            margin-bottom: var(--spacing-sm);
            letter-spacing: 0.04em;
        }

        .footer-links ul {
            list-style: none;
        }

        .footer-links ul li {
            margin-bottom: 6px;
        }

        .footer-links ul li a {
            font-size: 0.85rem;
            color: var(--text-muted);
            transition: color var(--transition-normal);
        }

        .footer-links ul li a:hover {
            color: var(--accent-cyan);
        }

        .footer-social {
            display: flex;
            gap: 12px;
            margin-top: var(--spacing-xs);
        }

        .footer-social a {
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.05);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1rem;
            color: var(--text-muted);
            transition: all var(--transition-normal);
            border: 1px solid rgba(255, 255, 255, 0.08);
        }

        .footer-social a:hover {
            background: rgba(0, 229, 255, 0.15);
            color: var(--accent-cyan);
            border-color: rgba(0, 229, 255, 0.3);
            box-shadow: 0 0 16px rgba(0, 229, 255, 0.25);
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            padding-top: var(--spacing-md);
            text-align: center;
            font-size: 0.8rem;
            color: var(--text-muted);
            letter-spacing: 0.03em;
        }

        .footer-bottom a {
            color: var(--accent-cyan);
        }
        .footer-bottom a:hover {
            text-decoration: underline;
        }

        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: var(--spacing-lg);
            }
            .footer-brand p {
                max-width: 100%;
            }
        }

        /* ========== 回到顶部 ========== */
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            z-index: 900;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: rgba(0, 229, 255, 0.15);
            border: 1px solid rgba(0, 229, 255, 0.3);
            color: var(--accent-cyan);
            font-size: 1.3rem;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all var(--transition-normal);
            opacity: 0;
            transform: translateY(20px);
            pointer-events: none;
            backdrop-filter: blur(6px);
            -webkit-backdrop-filter: blur(6px);
        }

        .back-to-top.visible {
            opacity: 1;
            transform: translateY(0);
            pointer-events: auto;
        }

        .back-to-top:hover {
            background: rgba(0, 229, 255, 0.25);
            box-shadow: 0 0 20px rgba(0, 229, 255, 0.4);
            transform: translateY(-3px);
        }

        @media (max-width: 768px) {
            .back-to-top {
                bottom: 20px;
                right: 16px;
                width: 38px;
                height: 38px;
                font-size: 1.1rem;
            }
        }

        /* ========== 辅助动画 ========== */
        .reveal {
            opacity: 0;
            transform: translateY(40px);
            transition: opacity 0.7s ease, transform 0.7s ease;
        }
        .reveal.visible {
            opacity: 1;
            transform: translateY(0);
        }

        @media (prefers-reduced-motion: reduce) {
            html {
                scroll-behavior: auto;
            }
            .reveal {
                transition: none;
                opacity: 1;
                transform: none;
            }
            * {
                animation-duration: 0.01ms !important;
                transition-duration: 0.01ms !important;
            }
        }