:root {
        --primary: #22d3ee;
        --accent: #fb923c;
        --bg: #0f172a;
        --text: #e2e8f0;
        --card-bg: rgba(30, 41, 59, 0.7);
        --card-border: rgba(148, 163, 184, 0.1);
        --shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.5);
        --radius: 20px;
        --radius-lg: 24px;
        --font-heading: 'Inter', sans-serif;
    }

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

    html {
        scroll-behavior: smooth;
        scroll-padding-top: 80px;
    }

    body {
        background-color: var(--bg);
        color: var(--text);
        font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
        line-height: 1.7;
        overflow-x: hidden;
    }

    /* 滚动进度条 */
    .progress-container {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 4px;
        background: transparent;
        z-index: 9999;
    }

    .progress-bar {
        height: 100%;
        background: linear-gradient(90deg, var(--primary), var(--accent));
        width: 0%;
        border-radius: 0 4px 4px 0;
        transition: width 0.1s ease;
        box-shadow: 0 0 20px rgba(34, 211, 238, 0.4);
    }

    /* 导航 */
    .navbar-custom {
        background: rgba(15, 23, 42, 0.85);
        backdrop-filter: blur(16px);
        border-bottom: 1px solid var(--card-border);
        padding: 14px 0;
    }

    .navbar-brand {
        font-size: 1.8rem;
        font-weight: 900;
        color: var(--text) !important;
        letter-spacing: 2px;
    }

    .navbar-brand .brand-icon {
        color: var(--accent);
        margin-right: 6px;
    }

    .navbar-toggler {
        border: 1px solid rgba(148, 163, 184, 0.3);
    }

    .navbar-toggler:focus {
        box-shadow: none;
    }

    .nav-link {
        color: var(--text) !important;
        font-weight: 500;
        font-size: 0.95rem;
        margin: 0 10px;
        padding: 8px 14px !important;
        border-radius: 12px;
        transition: all 0.3s ease;
        position: relative;
    }

    .nav-link:hover {
        color: var(--primary) !important;
        background: rgba(34, 211, 238, 0.1);
    }

    .nav-link::after {
        content: '';
        position: absolute;
        bottom: 2px;
        left: 50%;
        transform: translateX(-50%);
        width: 0;
        height: 2px;
        background: linear-gradient(90deg, var(--primary), var(--accent));
        border-radius: 2px;
        transition: width 0.3s ease;
    }

    .nav-link:hover::after {
        width: 60%;
    }

    /* Hero 区块 */
    .hero-section {
        position: relative;
        padding: 140px 0 120px;
        background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #111827 100%);
        overflow: hidden;
        background-attachment: fixed;
        background-position: center;
        background-size: cover;
    }

    .hero-section::before {
        content: '';
        position: absolute;
        top: -50%;
        right: -20%;
        width: 600px;
        height: 600px;
        background: radial-gradient(circle, rgba(34, 211, 238, 0.08) 0%, transparent 70%);
        border-radius: 50%;
        pointer-events: none;
    }

    .hero-section::after {
        content: '';
        position: absolute;
        bottom: -30%;
        left: -10%;
        width: 500px;
        height: 500px;
        background: radial-gradient(circle, rgba(251, 146, 60, 0.06) 0%, transparent 70%);
        border-radius: 50%;
        pointer-events: none;
    }

    .hero-badge {
        display: inline-flex;
        align-items: center;
        gap: 10px;
        background: rgba(34, 211, 238, 0.1);
        border: 1px solid rgba(34, 211, 238, 0.3);
        padding: 8px 22px;
        border-radius: 50px;
        font-size: 0.9rem;
        font-weight: 500;
        color: var(--primary);
        margin-bottom: 30px;
        letter-spacing: 1px;
    }

    .hero-title {
        font-size: 4.2rem;
        font-weight: 900;
        line-height: 1.2;
        margin-bottom: 20px;
        color: #ffffff;
        letter-spacing: -1px;
    }

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

    .hero-subtitle {
        font-size: 1.2rem;
        color: rgba(226, 232, 240, 0.75);
        max-width: 600px;
        margin: 0 auto 40px;
        font-weight: 300;
        line-height: 1.8;
    }

    .hero-stats {
        display: flex;
        justify-content: center;
        gap: 60px;
        flex-wrap: wrap;
        margin-bottom: 50px;
    }

    .stat-item {
        text-align: center;
        position: relative;
    }

    .stat-item:not(:last-child)::after {
        content: '';
        position: absolute;
        right: -30px;
        top: 10%;
        height: 80%;
        width: 1px;
        background: rgba(148, 163, 184, 0.2);
    }

    .stat-number {
        font-size: 3.5rem;
        font-weight: 900;
        color: var(--primary);
        line-height: 1.2;
        display: block;
        text-shadow: 0 0 40px rgba(34, 211, 238, 0.3);
    }

    .stat-label {
        font-size: 0.9rem;
        color: rgba(226, 232, 240, 0.6);
        margin-top: 8px;
        letter-spacing: 2px;
        text-transform: uppercase;
    }

    .stat-number.accent {
        color: var(--accent);
        text-shadow: 0 0 40px rgba(251, 146, 60, 0.3);
    }

    .btn-custom-primary {
        display: inline-flex;
        align-items: center;
        gap: 12px;
        background: linear-gradient(135deg, var(--primary), #0ea5e9);
        color: #0f172a;
        font-weight: 700;
        font-size: 1.05rem;
        padding: 16px 40px;
        border-radius: 50px;
        border: none;
        text-decoration: none;
        transition: all 0.4s ease;
        position: relative;
        overflow: hidden;
        box-shadow: 0 8px 32px rgba(34, 211, 238, 0.25);
    }

    .btn-custom-primary::before {
        content: '';
        position: absolute;
        top: 0;
        left: -100%;
        width: 100%;
        height: 100%;
        background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
        transition: left 0.5s ease;
    }

    .btn-custom-primary:hover::before {
        left: 100%;
    }

    .btn-custom-primary:hover {
        transform: translateY(-3px);
        box-shadow: 0 12px 40px rgba(34, 211, 238, 0.35);
    }

    .btn-custom-outline {
        display: inline-flex;
        align-items: center;
        gap: 12px;
        background: transparent;
        color: var(--text);
        font-weight: 600;
        font-size: 1.05rem;
        padding: 16px 40px;
        border-radius: 50px;
        border: 2px solid rgba(148, 163, 184, 0.3);
        text-decoration: none;
        transition: all 0.4s ease;
        margin-left: 20px;
    }

    .btn-custom-outline:hover {
        border-color: var(--accent);
        color: var(--accent);
        transform: translateY(-3px);
    }

    /* 区块通用 */
    .section {
        padding: 100px 0;
        position: relative;
    }

    .section-label {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        font-size: 0.8rem;
        font-weight: 600;
        letter-spacing: 3px;
        text-transform: uppercase;
        color: var(--accent);
        margin-bottom: 12px;
        background: rgba(251, 146, 60, 0.08);
        padding: 6px 18px;
        border-radius: 50px;
        border: 1px solid rgba(251, 146, 60, 0.2);
    }

    .section-title {
        font-size: 2.8rem;
        font-weight: 800;
        color: #ffffff;
        margin-bottom: 20px;
        letter-spacing: -0.5px;
        line-height: 1.3;
    }

    .section-desc {
        font-size: 1.1rem;
        color: rgba(226, 232, 240, 0.65);
        max-width: 650px;
        margin: 0 auto 60px;
        font-weight: 300;
    }

    /* 数据统计 */
    .stats-section {
        background: transparent;
        padding: 80px 0;
    }

    .stats-card {
        background: rgba(30, 41, 59, 0.6);
        border: 1px solid var(--card-border);
        border-radius: var(--radius-lg);
        padding: 40px 20px;
        backdrop-filter: blur(10px);
        transition: all 0.3s ease;
    }

    .stats-card:hover {
        background: rgba(30, 41, 59, 0.9);
        transform: translateY(-5px);
        box-shadow: var(--shadow);
    }

    .stats-card-icon {
        font-size: 2.5rem;
        color: var(--primary);
        margin-bottom: 20px;
    }

    .stats-card-number {
        font-size: 2.8rem;
        font-weight: 900;
        color: #ffffff;
        line-height: 1.2;
    }

    .stats-card-label {
        font-size: 0.9rem;
        color: rgba(226, 232, 240, 0.6);
        margin-top: 8px;
    }

    /* 使用说明-时间线 */
    .timeline-section {
        background: linear-gradient(180deg, rgba(15, 23, 42, 1) 0%, rgba(30, 41, 59, 0.3) 100%);
        padding: 100px 0;
    }

    .timeline-wrapper {
        position: relative;
        max-width: 900px;
        margin: 0 auto;
    }

    .timeline-wrapper::before {
        content: '';
        position: absolute;
        left: 50%;
        top: 0;
        bottom: 0;
        width: 3px;
        background: linear-gradient(180deg, var(--primary), var(--accent));
        transform: translateX(-50%);
        border-radius: 3px;
        opacity: 0.3;
    }

    .timeline-item {
        display: flex;
        align-items: center;
        margin-bottom: 60px;
        position: relative;
    }

    .timeline-item:nth-child(odd) {
        flex-direction: row;
    }

    .timeline-item:nth-child(even) {
        flex-direction: row-reverse;
    }

    .timeline-dot {
        width: 20px;
        height: 20px;
        background: var(--bg);
        border: 4px solid var(--primary);
        border-radius: 50%;
        position: absolute;
        left: 50%;
        transform: translateX(-50%);
        z-index: 2;
        box-shadow: 0 0 20px rgba(34, 211, 238, 0.5);
    }

    .timeline-item:nth-child(even) .timeline-dot {
        border-color: var(--accent);
        box-shadow: 0 0 20px rgba(251, 146, 60, 0.5);
    }

    .timeline-content {
        width: calc(50% - 60px);
        background: rgba(30, 41, 59, 0.7);
        border: 1px solid var(--card-border);
        border-radius: var(--radius-lg);
        padding: 30px;
        backdrop-filter: blur(10px);
        transition: all 0.4s ease;
        position: relative;
    }

    .timeline-content:hover {
        background: rgba(30, 41, 59, 0.95);
        transform: scale(1.02);
        box-shadow: var(--shadow);
    }

    .timeline-number {
        font-size: 0.8rem;
        font-weight: 700;
        color: var(--accent);
        letter-spacing: 3px;
        margin-bottom: 10px;
        text-transform: uppercase;
    }

    .timeline-content h3 {
        font-size: 1.4rem;
        font-weight: 700;
        color: #ffffff;
        margin-bottom: 12px;
    }

    .timeline-content p {
        font-size: 0.95rem;
        color: rgba(226, 232, 240, 0.7);
        margin: 0;
        font-weight: 300;
        line-height: 1.7;
    }

    /* 特色-图标列表 */
    .features-section {
        background: var(--bg);
        padding: 100px 0;
    }

    .feature-card {
        background: rgba(30, 41, 59, 0.5);
        border: 1px solid var(--card-border);
        border-radius: var(--radius-lg);
        padding: 40px 30px;
        height: 100%;
        transition: all 0.4s ease;
        position: relative;
        overflow: hidden;
    }

    .feature-card::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        height: 3px;
        background: linear-gradient(90deg, var(--primary), var(--accent));
        opacity: 0;
        transition: all 0.4s ease;
    }

    .feature-card:hover::before {
        opacity: 1;
    }

    .feature-card:hover {
        background: rgba(30, 41, 59, 0.8);
        transform: translateY(-8px);
        box-shadow: var(--shadow);
    }

    .feature-icon {
        width: 70px;
        height: 70px;
        background: rgba(34, 211, 238, 0.1);
        border-radius: 18px;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.8rem;
        color: var(--primary);
        margin-bottom: 25px;
        border: 1px solid rgba(34, 211, 238, 0.2);
    }

    .feature-card:nth-child(3n+2) .feature-icon {
        background: rgba(251, 146, 60, 0.1);
        border-color: rgba(251, 146, 60, 0.2);
        color: var(--accent);
    }

    .feature-card h3 {
        font-size: 1.3rem;
        font-weight: 700;
        color: #ffffff;
        margin-bottom: 15px;
    }

    .feature-card p {
        font-size: 0.95rem;
        color: rgba(226, 232, 240, 0.65);
        line-height: 1.7;
        margin: 0;
        font-weight: 300;
    }

    /* FAQ-手风琴 */
    .faq-section {
        background: linear-gradient(180deg, rgba(30, 41, 59, 0.3) 0%, var(--bg) 100%);
        padding: 100px 0;
    }

    .accordion-custom {
        max-width: 800px;
        margin: 0 auto;
    }

    .accordion-item-custom {
        background: rgba(30, 41, 59, 0.6);
        border: 1px solid var(--card-border);
        border-radius: var(--radius) !important;
        margin-bottom: 16px;
        overflow: hidden;
        transition: all 0.3s ease;
    }

    .accordion-item-custom:hover {
        border-color: rgba(34, 211, 238, 0.3);
    }

    .accordion-button-custom {
        width: 100%;
        padding: 22px 30px;
        background: transparent;
        border: none;
        color: var(--text);
        font-size: 1.05rem;
        font-weight: 600;
        display: flex;
        justify-content: space-between;
        align-items: center;
        cursor: pointer;
        transition: all 0.3s ease;
        font-family: var(--font-heading);
    }

    .accordion-button-custom:hover {
        color: var(--primary);
    }

    .accordion-icon {
        width: 36px;
        height: 36px;
        min-width: 36px;
        background: rgba(34, 211, 238, 0.1);
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 0.9rem;
        color: var(--primary);
        transition: all 0.4s ease;
    }

    .accordion-item-custom.active .accordion-icon {
        background: var(--primary);
        color: #0f172a;
        transform: rotate(45deg);
    }

    .accordion-body-custom {
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.5s ease;
        padding: 0 30px;
    }

    .accordion-item-custom.active .accordion-body-custom {
        max-height: 400px;
        padding-bottom: 25px;
    }

    .accordion-body-custom p {
        color: rgba(226, 232, 240, 0.65);
        font-size: 0.95rem;
        line-height: 1.8;
        font-weight: 300;
        border-top: 1px solid var(--card-border);
        padding-top: 20px;
    }

    /* CTA */
    .cta-section {
        padding: 100px 0;
        position: relative;
        overflow: hidden;
        background: linear-gradient(135deg, rgba(34, 211, 238, 0.1) 0%, rgba(251, 146, 60, 0.1) 100%);
        border-top: 1px solid var(--card-border);
        border-bottom: 1px solid var(--card-border);
    }

    .cta-box {
        background: rgba(30, 41, 59, 0.8);
        border: 1px solid var(--card-border);
        border-radius: var(--radius-lg);
        padding: 60px;
        text-align: center;
        max-width: 800px;
        margin: 0 auto;
        backdrop-filter: blur(10px);
    }

    .cta-box h2 {
        font-size: 2.4rem;
        font-weight: 800;
        color: #ffffff;
        margin-bottom: 20px;
    }

    .cta-box p {
        font-size: 1.1rem;
        color: rgba(226, 232, 240, 0.7);
        margin-bottom: 40px;
        font-weight: 300;
    }

    .btn-cta {
        background: linear-gradient(135deg, var(--accent), #f97316);
        color: #0f172a;
        font-weight: 700;
        font-size: 1.1rem;
        padding: 18px 50px;
        border-radius: 50px;
        border: none;
        text-decoration: none;
        display: inline-flex;
        align-items: center;
        gap: 12px;
        position: relative;
        overflow: hidden;
        box-shadow: 0 8px 32px rgba(251, 146, 60, 0.3);
        transition: all 0.4s ease;
    }

    .btn-cta::before {
        content: '';
        position: absolute;
        top: 0;
        left: -100%;
        width: 100%;
        height: 100%;
        background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.5), transparent);
        transition: left 0.5s ease;
    }

    .btn-cta:hover::before {
        left: 100%;
    }

    .btn-cta:hover {
        transform: translateY(-3px) scale(1.02);
        box-shadow: 0 15px 40px rgba(251, 146, 60, 0.4);
    }

    /* 友情链接 */
    .friend-links {
        padding: 60px 0;
        border-top: 1px solid var(--card-border);
    }

    .friend-links h5 {
        font-size: 0.9rem;
        color: rgba(226, 232, 240, 0.5);
        text-transform: uppercase;
        letter-spacing: 3px;
        margin-bottom: 20px;
        text-align: center;
    }

    .friend-links-content {
        text-align: center;
        font-size: 0.95rem;
        color: rgba(226, 232, 240, 0.5);
    }

    /* 页脚 */
    .footer {
        padding: 60px 0 30px;
        background: #0b1222;
        border-top: 1px solid var(--card-border);
    }

    .footer-brand {
        font-size: 1.6rem;
        font-weight: 900;
        color: #ffffff;
        margin-bottom: 20px;
    }

    .footer-text {
        font-size: 0.9rem;
        color: rgba(226, 232, 240, 0.5);
        line-height: 1.8;
        font-weight: 300;
    }

    .footer-links h6 {
        font-size: 0.9rem;
        font-weight: 600;
        color: var(--text);
        margin-bottom: 15px;
    }

    .footer-links a {
        display: block;
        color: rgba(226, 232, 240, 0.5);
        text-decoration: none;
        font-size: 0.9rem;
        margin-bottom: 8px;
        transition: all 0.3s ease;
        font-weight: 300;
    }

    .footer-links a:hover {
        color: var(--primary);
        padding-left: 5px;
    }

    .footer-bottom {
        border-top: 1px solid var(--card-border);
        padding-top: 30px;
        margin-top: 40px;
        text-align: center;
        color: rgba(226, 232, 240, 0.4);
        font-size: 0.85rem;
    }

    /* 视差滚动 */
    .parallax-bg {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 120%;
        background-image: radial-gradient(circle at 20% 30%, rgba(34, 211, 238, 0.05) 0%, transparent 50%),
            radial-gradient(circle at 80% 70%, rgba(251, 146, 60, 0.05) 0%, transparent 50%);
        pointer-events: none;
        z-index: 0;
        will-change: transform;
    }

    .hero-content {
        position: relative;
        z-index: 1;
    }

    /* 响应式 */
    @media (max-width: 992px) {
        .hero-title {
            font-size: 3rem;
        }

        .stat-number {
            font-size: 2.5rem;
        }

        .timeline-wrapper::before {
            left: 30px;
        }

        .timeline-content {
            width: calc(100% - 80px);
            margin-left: 80px;
        }

        .timeline-item:nth-child(odd),
        .timeline-item:nth-child(even) {
            flex-direction: row;
            justify-content: flex-start;
        }

        .timeline-dot {
            left: 30px;
            transform: translateX(-50%);
        }

        .btn-custom-outline {
            margin-left: 0;
            margin-top: 15px;
        }
    }

    @media (max-width: 768px) {
        .hero-section {
            padding: 100px 0 80px;
        }

        .hero-title {
            font-size: 2.4rem;
        }

        .hero-stats {
            gap: 30px;
        }

        .stat-item:not(:last-child)::after {
            right: -15px;
        }

        .section {
            padding: 70px 0;
        }

        .section-title {
            font-size: 2rem;
        }

        .cta-box {
            padding: 40px 25px;
        }
    }

    @media (max-width: 576px) {
        .hero-stats {
            flex-direction: column;
            gap: 20px;
        }

        .stat-item:not(:last-child)::after {
            display: none;
        }

        .btn-custom-primary,
        .btn-custom-outline {
            width: 100%;
            justify-content: center;
        }

        .timeline-content {
            width: calc(100% - 60px);
            margin-left: 60px;
            padding: 20px;
        }
    }