/* roulang page: index */
:root {
            --primary-deep: #0B0E14;
            --primary-dark: #111827;
            --accent-purple: #6C3CE1;
            --accent-cyan: #00E5A1;
            --card-bg: #1A1F2E;
            --card-bg-alt: #1E2532;
            --text-primary: #FFFFFF;
            --text-secondary: #E2E8F0;
            --text-muted: #94A3B8;
            --border-subtle: rgba(255,255,255,0.05);
            --border-medium: #2D3748;
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 50px;
            --shadow-card: 0 4px 24px rgba(0,0,0,0.3);
            --shadow-elevated: 0 8px 30px rgba(0,0,0,0.4);
            --transition-smooth: all 0.3s ease;
            --font-heading: "Inter", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
            --font-body: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
        }

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

        body {
            font-family: var(--font-body);
            background-color: var(--primary-deep);
            color: var(--text-primary);
            line-height: 1.7;
            font-size: 1rem;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }

        h1, h2, h3, h4, h5, h6 {
            font-family: var(--font-heading);
            font-weight: 700;
            letter-spacing: -0.02em;
            color: var(--text-primary);
            margin-bottom: 0.5rem;
        }

        h1 { font-size: clamp(2.4rem, 5vw, 3.8rem); font-weight: 800; }
        h2 { font-size: clamp(1.9rem, 4vw, 2.8rem); font-weight: 700; }
        h3 { font-size: clamp(1.4rem, 3vw, 1.8rem); font-weight: 600; }
        h4 { font-size: 1.25rem; font-weight: 600; }

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

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

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }

        section {
            padding: 5rem 0;
        }

        .gradient-text {
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 14px 32px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: var(--transition-smooth);
            border: none;
            text-align: center;
            white-space: nowrap;
        }

        .btn-primary {
            background: var(--accent-purple);
            color: white;
            box-shadow: 0 4px 15px rgba(108,60,225,0.3);
        }
        .btn-primary:hover {
            background: #7d52e6;
            box-shadow: 0 0 25px rgba(108,60,225,0.6);
            transform: translateY(-2px);
            color: white;
        }

        .btn-outline {
            background: transparent;
            border: 2px solid var(--accent-cyan);
            color: var(--accent-cyan);
        }
        .btn-outline:hover {
            background: rgba(0,229,161,0.08);
            border-color: #00f0b5;
            color: #00f0b5;
            transform: translateY(-2px);
        }

        .card {
            background: var(--card-bg);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 2rem;
            transition: var(--transition-smooth);
            box-shadow: var(--shadow-card);
            height: 100%;
            display: flex;
            flex-direction: column;
        }
        .card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-elevated);
            background: var(--card-bg-alt);
        }

        .tag {
            display: inline-block;
            background: rgba(108,60,225,0.25);
            color: var(--accent-cyan);
            font-size: 0.8rem;
            font-weight: 600;
            padding: 0.25rem 0.8rem;
            border-radius: 20px;
            letter-spacing: 0.5px;
            text-transform: uppercase;
        }

        /* 导航 */
        .header-capsule {
            position: fixed;
            top: 20px;
            left: 50%;
            transform: translateX(-50%);
            width: calc(100% - 3rem);
            max-width: 1100px;
            z-index: 1000;
            background: rgba(10, 14, 20, 0.9);
            backdrop-filter: blur(12px);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-subtle);
            padding: 0.7rem 2rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
            box-shadow: 0 10px 30px rgba(0,0,0,0.5);
        }

        .logo {
            font-family: var(--font-heading);
            font-weight: 800;
            font-size: 1.6rem;
            color: var(--text-primary);
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }
        .logo i {
            color: var(--accent-cyan);
            font-size: 2rem;
        }

        .nav-links {
            display: flex;
            gap: 2rem;
            align-items: center;
        }
        .nav-links a {
            color: var(--text-secondary);
            font-weight: 500;
            position: relative;
            padding: 0.3rem 0;
        }
        .nav-links a.active {
            color: white;
        }
        .nav-links a.active::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 100%;
            height: 3px;
            background: var(--accent-purple);
            border-radius: 3px;
        }
        .nav-links a:hover {
            color: white;
        }
        .nav-cta {
            background: var(--accent-purple);
            color: white !important;
            padding: 0.6rem 1.8rem !important;
            border-radius: var(--radius-lg);
            font-weight: 600 !important;
        }
        .nav-cta:hover {
            background: #7d52e6;
        }

        .burger {
            display: none;
            font-size: 1.8rem;
            color: white;
            cursor: pointer;
        }

        /* Hero */
        .hero {
            padding: 10rem 0 6rem;
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            background-attachment: fixed;
            position: relative;
            min-height: 90vh;
            display: flex;
            align-items: center;
        }
        .hero::before {
            content: '';
            position: absolute;
            top:0;left:0;right:0;bottom:0;
            background: radial-gradient(circle at 30% 40%, rgba(28, 25, 48, 0.7), rgba(10,14,20,0.95));
            z-index: 1;
        }
        .hero .container {
            position: relative;
            z-index: 2;
            display: flex;
            align-items: center;
            gap: 3rem;
        }
        .hero-left {
            flex: 0 0 60%;
        }
        .hero-right {
            flex: 0 0 40%;
            display: flex;
            justify-content: center;
            align-items: center;
        }
        .hero-right img {
            max-width: 90%;
            filter: drop-shadow(0 20px 40px rgba(0,229,161,0.3));
            animation: float 6s ease-in-out infinite;
        }
        @keyframes float {
            0%,100% { transform: translateY(0); }
            50% { transform: translateY(-15px); }
        }
        .hero-sub {
            font-size: 1.25rem;
            color: var(--text-muted);
            margin: 1.5rem 0 2.5rem;
            line-height: 1.8;
            max-width: 90%;
        }
        .hero-actions {
            display: flex;
            gap: 1rem;
            flex-wrap: wrap;
        }

        /* 亮点网格 */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
        }
        .feature-icon {
            font-size: 2.2rem;
            color: var(--accent-cyan);
            margin-bottom: 1.2rem;
        }
        .feature-card h3 {
            font-size: 1.4rem;
            margin-bottom: 0.8rem;
        }
        .feature-card p {
            color: var(--text-muted);
            font-size: 0.95rem;
            flex: 1;
        }

        /* 案例瀑布 */
        .cases-masonry {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.5rem;
        }
        .case-card {
            background: transparent;
            border: none;
            box-shadow: none;
            padding: 0;
            overflow: hidden;
            border-radius: var(--radius-md);
            cursor: pointer;
        }
        .case-card img {
            border-radius: var(--radius-md);
            transition: transform 0.4s ease;
            width: 100%;
            height: 240px;
            object-fit: cover;
        }
        .case-card:hover img {
            transform: scale(1.04);
        }
        .case-info {
            padding: 1rem 0.2rem;
        }
        .case-info h4 {
            margin: 0.5rem 0 0.2rem;
            font-size: 1.2rem;
        }
        .case-tags {
            display: flex;
            gap: 0.5rem;
            margin-top: 0.5rem;
        }

        /* 方案对比 */
        .compare-table {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.5rem;
        }
        .plan-card {
            background: var(--card-bg);
            border-radius: var(--radius-md);
            padding: 2rem;
            text-align: center;
            border: 1px solid var(--border-subtle);
        }
        .plan-card.featured {
            border-color: var(--accent-purple);
            box-shadow: 0 0 30px rgba(108,60,225,0.3);
            position: relative;
        }
        .plan-card h3 {
            font-size: 1.8rem;
            margin-bottom: 1rem;
        }
        .plan-price {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--accent-cyan);
            margin: 1rem 0;
        }
        .plan-features {
            list-style: none;
            text-align: left;
            margin: 2rem 0;
            color: var(--text-muted);
        }
        .plan-features li {
            padding: 0.5rem 0;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .plan-features i {
            color: var(--accent-cyan);
        }

        /* FAQ */
        .faq-list {
            max-width: 860px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--card-bg);
            border-radius: var(--radius-sm);
            margin-bottom: 1rem;
            border: 1px solid var(--border-subtle);
            overflow: hidden;
        }
        .faq-question {
            padding: 1.2rem 2rem;
            font-weight: 600;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            background: none;
            border: none;
            width: 100%;
            color: white;
            font-size: 1.1rem;
        }
        .faq-answer {
            padding: 0 2rem 1.5rem;
            color: var(--text-muted);
            display: none;
            line-height: 1.8;
        }
        .faq-item.active .faq-answer {
            display: block;
        }

        /* CTA 横幅 */
        .cta-banner {
            background: linear-gradient(135deg, #1A1035, #0B0E14);
            text-align: center;
            border-radius: var(--radius-md);
            padding: 4rem 2rem;
            margin: 3rem auto;
            border: 1px solid rgba(108,60,225,0.25);
        }

        /* Footer */
        .footer {
            background: var(--primary-dark);
            padding: 4rem 0 1.5rem;
            color: var(--text-muted);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 2rem;
        }
        .footer h4 {
            color: white;
            margin-bottom: 1.2rem;
        }
        .footer a {
            color: var(--text-muted);
            display: block;
            margin-bottom: 0.5rem;
        }
        .footer a:hover {
            color: var(--accent-cyan);
        }
        .copyright {
            margin-top: 3rem;
            text-align: center;
            border-top: 1px solid var(--border-medium);
            padding-top: 1.5rem;
            font-size: 0.9rem;
        }

        @media (max-width: 1024px) {
            .features-grid { grid-template-columns: repeat(2, 1fr); }
            .cases-masonry { grid-template-columns: repeat(2, 1fr); }
            .compare-table { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }

        @media (max-width: 768px) {
            .header-capsule {
                padding: 0.7rem 1.2rem;
                top: 10px;
                width: 95%;
            }
            .nav-links { display: none; }
            .burger { display: block; }
            .mobile-menu {
                display: flex;
                flex-direction: column;
                position: absolute;
                top: 70px;
                right: 10px;
                background: rgba(10,14,20,0.95);
                backdrop-filter: blur(20px);
                border-radius: 20px;
                padding: 1.5rem;
                gap: 1.2rem;
                border: 1px solid var(--border-subtle);
            }
            .hero .container {
                flex-direction: column;
                text-align: center;
            }
            .hero-left, .hero-right { flex: 1; }
            .hero-sub { max-width: 100%; }
            .features-grid { grid-template-columns: 1fr; }
            .cases-masonry { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; }
            section { padding: 3rem 0; }
        }

        @media (max-width: 520px) {
            .hero-actions { flex-direction: column; align-items: center; }
            .btn { width: 100%; }
        }