:root{
        --primary:#38bdf8;
        --accent:#a78bfa;
        --bg:#0f172a;
        --text:#e2e8f0;
        --card-bg:#1e293b;
        --radius-lg:24px;
        --radius-md:16px;
        --radius-pill:50rem;
        --shadow:0 20px 35px -8px rgba(0,0,0,0.4);
    }

    *{box-sizing:border-box;}
    body{
        background-color:var(--bg);
        color:var(--text);
        font-family:'Inter', '思源黑体', system-ui, -apple-system, sans-serif;
        line-height:1.7;
        overflow-x:hidden;
    }

    /* 思源宋体用于大标题 */
    h1,h2,h3,.font-serif{
        font-family:'Source Han Serif SC','思源宋体',Georgia,serif;
        font-weight:700;
        letter-spacing:0.02em;
    }

    /* 滚动进度条 */
    #progressBar{
        position:fixed;
        top:0;left:0;
        height:4px;
        width:0%;
        background:linear-gradient(90deg, var(--primary), var(--accent));
        z-index:9999;
        transition:width 0.1s ease;
        border-radius:0 4px 4px 0;
        box-shadow:0 0 12px var(--primary);
    }

    /* 顶部导航 */
    .navbar-custom{
        background:rgba(15,23,42,0.8);
        backdrop-filter: blur(14px);
        -webkit-backdrop-filter:blur(14px);
        border-bottom:1px solid rgba(56,189,248,0.2);
        padding:1rem 0;
        transition:all 0.2s;
    }
    .navbar-brand{
        font-size:1.6rem;
        font-weight:800;
        color:var(--text);
        letter-spacing:1px;
        display:flex;
        align-items:center;
        gap:8px;
    }
    .navbar-brand .brand-icon{
        font-size:2rem;
        background:linear-gradient(135deg,var(--primary),var(--accent));
        -webkit-background-clip:text;
        background-clip:text;
        color:transparent;
    }
    .navbar-custom .nav-link{
        color:var(--text);
        font-weight:500;
        margin:0 0.5rem;
        border-radius:var(--radius-pill);
        padding:0.4rem 1.2rem !important;
        transition:all 0.2s;
    }
    .navbar-custom .nav-link:hover{
        background:rgba(56,189,248,0.15);
        color:var(--primary);
    }
    .navbar-toggler{
        border-color:rgba(56,189,248,0.5);
    }
    .navbar-toggler-icon{
        background-image:url("data:image/svg+xml,%3csvg viewBox='0 0 30 30' xmlns='http://www.w3.org/2000/svg'%3e%3cpath stroke='%2338bdf8' stroke-width='2' linecap='round' linejoin='round' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }

    /* Hero区域 */
    .hero-section{
        min-height:100vh;
        display:flex;
        align-items:center;
        justify-content:center;
        text-align:center;
        position:relative;
        padding:120px 0 80px;
        background: radial-gradient(circle at 20% 30%, rgba(56,189,248,0.18) 0%, transparent 50%),
                    radial-gradient(circle at 90% 70%, rgba(167,139,250,0.25) 0%, transparent 45%);
        overflow:hidden;
    }
    .hero-section::before{
        content:'';
        position:absolute;
        width:500px;height:500px;
        background:radial-gradient(circle, rgba(56,189,248,0.2) 0%, transparent 70%);
        top:10%;left:-5%;
        filter:blur(50px);
        animation:float 6s ease-in-out infinite alternate;
    }
    .hero-section::after{
        content:'';
        position:absolute;
        width:400px;height:400px;
        background:radial-gradient(circle, rgba(167,139,250,0.25) 0%, transparent 70%);
        bottom:5%;right:-10%;
        filter:blur(60px);
        animation:float 8s ease-in-out infinite alternate-reverse;
    }
    @keyframes float{
        0%{transform:translate(0,0) scale(1);}
        100%{transform:translate(20px,-20px) scale(1.1);}
    }
    .hero-content{
        position:relative;
        z-index:2;
    }
    .hero-badge{
        display:inline-block;
        background:rgba(56,189,248,0.15);
        border:1px solid var(--primary);
        color:var(--primary);
        border-radius:var(--radius-pill);
        padding:0.3rem 1.2rem;
        font-size:0.9rem;
        letter-spacing:2px;
        backdrop-filter:blur(4px);
        margin-bottom:1.8rem;
    }
    .hero-title{
        font-size:clamp(3rem, 8vw, 4.5rem);
        font-weight:900;
        line-height:1.2;
        background:linear-gradient(135deg, var(--primary) 0%, var(--accent) 80%);
        -webkit-background-clip:text;
        background-clip:text;
        color:transparent;
        margin-bottom:1.5rem;
        text-shadow:0 10px 30px rgba(56,189,248,0.2);
    }
    .hero-sub{
        font-size:1.3rem;
        color:#b6c2d4;
        max-width:700px;
        margin:0 auto 2.5rem;
        font-weight:300;
        letter-spacing:1px;
    }
    .btn-custom{
        border-radius:var(--radius-pill);
        padding:0.8rem 2.2rem;
        font-weight:600;
        border:none;
        transition:0.3s;
        box-shadow:0 8px 20px rgba(56,189,248,0.2);
    }
    .btn-primary-glow{
        background:linear-gradient(45deg, var(--primary), var(--accent));
        color:#0f172a;
        font-weight:700;
    }
    .btn-primary-glow:hover{
        transform:translateY(-3px);
        box-shadow:0 15px 30px rgba(56,189,248,0.4);
        color:#0f172a;
    }

    /* 特色卡片 */
    .card-section{
        padding:100px 0;
        position:relative;
    }
    .section-title{
        font-size:2.5rem;
        font-weight:800;
        margin-bottom:2rem;
        position:relative;
    }
    .section-title span{
        color:var(--primary);
    }
    .card-custom{
        background:var(--card-bg);
        border:1px solid rgba(56,189,248,0.12);
        border-radius:var(--radius-lg);
        padding:2rem 1.5rem;
        transition:0.4s;
        height:100%;
        box-shadow:var(--shadow);
        position:relative;
        overflow:hidden;
    }
    .card-custom:hover{
        transform:translateY(-8px);
        border-color:rgba(56,189,248,0.5);
        box-shadow:0 30px 45px -10px rgba(56,189,248,0.2);
    }
    .card-icon{
        font-size:2.5rem;
        background:linear-gradient(135deg,var(--primary),var(--accent));
        -webkit-background-clip:text;
        background-clip:text;
        color:transparent;
        margin-bottom:1.2rem;
    }
    .card-custom h3{
        font-size:1.4rem;
        font-weight:700;
        margin-bottom:1rem;
        color:#f1f5f9;
    }
    .card-custom p{
        color:#b0bccd;
        font-size:0.95rem;
    }

    /* 长文介绍 + 步骤 */
    .long-article{
        background:rgba(30,41,59,0.4);
        padding:100px 0;
        border-radius:0;
    }
    .step-item{
        display:flex;
        gap:1.5rem;
        margin:2.5rem 0;
        align-items:flex-start;
    }
    .step-num{
        background:linear-gradient(135deg,var(--primary),var(--accent));
        min-width:60px;height:60px;
        border-radius:var(--radius-pill);
        display:flex;align-items:center;justify-content:center;
        font-size:1.6rem;font-weight:800;
        color:#0f172a;
        box-shadow:0 10px 25px rgba(56,189,248,0.3);
    }
    .step-content h4{
        font-size:1.4rem;
        font-weight:700;
        color:#f8fafc;
    }
    .step-content p{
        color:#b6c2d4;
        max-width:600px;
    }

    /* FAQ */
    .faq-section{
        padding:100px 0;
    }
    .faq-item{
        background:var(--card-bg);
        border-radius:var(--radius-md);
        padding:1.8rem;
        margin-bottom:1.5rem;
        border:1px solid rgba(56,189,248,0.08);
        transition:0.2s;
    }
    .faq-item h4{
        font-weight:700;
        font-size:1.2rem;
        color:var(--primary);
        margin-bottom:0.8rem;
    }
    .faq-item p{
        color:#cbd5e1;
        margin:0;
    }

    /* CTA */
    .cta-section{
        padding:80px 0;
        text-align:center;
        background:radial-gradient(circle, rgba(56,189,248,0.1) 0%, transparent 70%);
    }
    .cta-btn{
        border-radius:var(--radius-pill);
        background:linear-gradient(45deg, var(--primary), var(--accent));
        border:none;
        color:#0f172a;
        font-weight:700;
        font-size:1.2rem;
        padding:0.8rem 3rem;
        margin-top:1.5rem;
        box-shadow:0 10px 30px rgba(56,189,248,0.3);
        transition:0.3s;
    }
    .cta-btn:hover{
        transform:scale(1.05);
        color:#0f172a;
    }

    /* 友情链接 + 页脚 */
    .friend-links{
        background:#0b1120;
        padding:50px 0 30px;
    }
    .footer-copyright{
        background:#0b1120;
        padding:20px 0;
        border-top:1px solid rgba(56,189,248,0.1);
        color:#8fa3b8;
    }
    .friend-links a{
        color:var(--primary);
        text-decoration:none;
        margin:0 0.8rem;
    }
    .friend-links a:hover{
        text-decoration:underline;
        color:var(--accent);
    }

    /* 图片hover放大 (示例卡片) */
    .img-hover{
        overflow:hidden;
        border-radius:var(--radius-md);
    }
    .img-hover img{
        transition:transform 0.5s ease;
        width:100%;
        display:block;
    }
    .img-hover:hover img{
        transform:scale(1.05);
    }

    /* 文字渐显遮罩 (使用伪元素) */
    .overlay-effect{
        position:relative;
    }
    .overlay-effect::after{
        content:'';
        position:absolute;
        inset:0;
        background:linear-gradient(to top, rgba(15,23,42,0.9), transparent 40%);
        opacity:0;
        transition:0.3s;
        pointer-events:none;
        border-radius:var(--radius-md);
    }
    .overlay-effect:hover::after{
        opacity:1;
    }

    /* 数字滚动计数 (JS实现) */
    .count-num{
        font-size:2rem;
        font-weight:800;
        color:var(--primary);
    }

    @media (max-width: 992px){
        .hero-title{font-size:3rem;}
        .navbar-custom .nav-link{margin:0.2rem 0;}
    }

/* --- 子页面追加 --- */
/* 本页专属补充样式——保证深色风格一致 */
        .about-hero {
            padding: 80px 0 40px;
            background: radial-gradient(ellipse at top, rgba(56, 189, 248, 0.12) 0%, transparent 60%);
        }
.about-hero .hero-badge {
            background: rgba(56, 189, 248, 0.15);
            border: 1px solid rgba(56, 189, 248, 0.3);
            color: var(--primary);
            padding: 6px 18px;
            border-radius: var(--radius-pill);
            display: inline-block;
            font-size: 14px;
            font-weight: 600;
            letter-spacing: 0.5px;
            margin-bottom: 20px;
        }
.about-hero .hero-title {
            font-size: 44px;
            font-weight: 800;
            color: var(--text);
            line-height: 1.2;
            margin-bottom: 16px;
        }
.about-hero .hero-title .gradient-text {
            background: linear-gradient(90deg, var(--primary), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
.about-hero .hero-sub {
            font-size: 18px;
            color: rgba(226, 232, 240, 0.7);
            max-width: 700px;
            margin: 0 auto;
            line-height: 1.8;
        }
.about-section {
            padding: 60px 0;
        }
.about-card {
            background: var(--card-bg);
            border-radius: var(--radius-lg);
            padding: 36px 32px;
            box-shadow: var(--shadow);
            border: 1px solid rgba(255,255,255,0.06);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            height: 100%;
        }
.about-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 30px 45px -8px rgba(0,0,0,0.5);
        }
.about-card .card-icon {
            font-size: 32px;
            color: var(--primary);
            margin-bottom: 18px;
            display: inline-block;
        }
.about-card .card-icon.accent {
            color: var(--accent);
        }
.about-card h3 {
            font-size: 22px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 14px;
        }
.about-card p {
            color: rgba(226, 232, 240, 0.75);
            line-height: 1.8;
            font-size: 15px;
            margin-bottom: 0;
        }
.section-subtitle {
            text-align: center;
            color: rgba(226, 232, 240, 0.6);
            font-size: 16px;
            margin-bottom: 48px;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }
.timeline-item {
            background: var(--card-bg);
            border-radius: var(--radius-md);
            padding: 24px 28px;
            border-left: 4px solid var(--primary);
            margin-bottom: 20px;
            box-shadow: 0 10px 20px -5px rgba(0,0,0,0.3);
        }
.timeline-item .timeline-date {
            font-size: 13px;
            color: var(--primary);
            font-weight: 600;
            letter-spacing: 0.5px;
            text-transform: uppercase;
            margin-bottom: 6px;
        }
.timeline-item h4 {
            font-size: 18px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 8px;
        }
.timeline-item p {
            color: rgba(226, 232, 240, 0.7);
            font-size: 14px;
            line-height: 1.7;
            margin-bottom: 0;
        }
.value-item {
            text-align: center;
            padding: 24px 20px;
        }
.value-item .value-icon {
            width: 72px;
            height: 72px;
            border-radius: 50%;
            background: rgba(56, 189, 248, 0.12);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
            font-size: 28px;
            color: var(--primary);
        }
.value-item .value-icon.purple {
            background: rgba(167, 139, 250, 0.12);
            color: var(--accent);
        }
.value-item .value-icon.green {
            background: rgba(52, 211, 153, 0.12);
            color: #34d399;
        }
.value-item h4 {
            font-size: 18px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 10px;
        }
.value-item p {
            color: rgba(226, 232, 240, 0.7);
            font-size: 14px;
            line-height: 1.7;
            margin-bottom: 0;
        }
.stats-row {
            background: var(--card-bg);
            border-radius: var(--radius-lg);
            padding: 40px 30px;
            box-shadow: var(--shadow);
            border: 1px solid rgba(255,255,255,0.06);
            margin: 40px 0;
        }
.stat-item {
            text-align: center;
        }
.stat-item .stat-num {
            font-size: 40px;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
        }
.stat-item .stat-label {
            font-size: 14px;
            color: rgba(226, 232, 240, 0.6);
            margin-top: 6px;
        }
.cta-section h2 {
            font-size: 32px;
            font-weight: 800;
            color: var(--text);
            margin-bottom: 16px;
        }
.cta-section p {
            color: rgba(226, 232, 240, 0.7);
            font-size: 16px;
            max-width: 500px;
            margin: 0 auto 28px;
        }
.friend-links .container {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 24px;
            flex-wrap: wrap;
        }
.about-hero .hero-title {
                font-size: 32px;
            }
.about-section {
                padding: 40px 0;
            }
.stats-row .stat-item {
                margin-bottom: 24px;
            }

/* --- 子页面追加 --- */
.disclaimer-section {
            max-width: 900px;
            margin: 0 auto;
            padding: 2rem 1.5rem;
        }
.disclaimer-card {
            background: var(--card-bg);
            border-radius: var(--radius-lg);
            padding: 2rem 2.5rem;
            margin-bottom: 1.5rem;
            box-shadow: var(--shadow);
            border: 1px solid rgba(56, 189, 248, 0.1);
        }
.disclaimer-card h2 {
            color: var(--primary);
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 1.2rem;
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }
.disclaimer-card h2 i {
            color: var(--accent);
            font-size: 1.3rem;
        }
.disclaimer-card p {
            color: var(--text);
            line-height: 1.8;
            font-size: 0.95rem;
            margin-bottom: 0.8rem;
        }
.disclaimer-card ul {
            padding-left: 1.5rem;
            margin-bottom: 0.8rem;
        }
.disclaimer-card ul li {
            color: var(--text);
            line-height: 1.8;
            font-size: 0.95rem;
            margin-bottom: 0.4rem;
        }
.disclaimer-highlight {
            background: rgba(167, 139, 250, 0.1);
            border-left: 4px solid var(--accent);
            padding: 1rem 1.2rem;
            border-radius: 0 var(--radius-md) var(--radius-md) 0;
            margin: 1.2rem 0;
        }
.disclaimer-highlight p {
            margin-bottom: 0;
            color: rgba(226, 232, 240, 0.9);
        }
.disclaimer-update {
            text-align: center;
            color: rgba(226, 232, 240, 0.5);
            font-size: 0.85rem;
            margin-top: 2rem;
            padding: 1rem;
        }
.disclaimer-card {
                padding: 1.5rem;
            }
.disclaimer-card h2 {
                font-size: 1.25rem;
            }

/* --- 子页面追加 --- */
/* 本页专属少量补充样式 */
        .privacy-hero {
            background: linear-gradient(135deg, rgba(56,189,248,0.08) 0%, rgba(167,139,250,0.08) 100%);
            border-bottom: 1px solid rgba(255,255,255,0.06);
        }
.privacy-section {
            padding: 80px 0;
        }
.privacy-section h2 {
            color: var(--primary);
            font-size: 1.6rem;
            font-weight: 700;
            margin-bottom: 1.2rem;
            position: relative;
            padding-left: 1.2rem;
        }
.privacy-section h2::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0.25rem;
            width: 4px;
            height: 1.4rem;
            background: var(--primary);
            border-radius: 2px;
        }
.privacy-card {
            background: var(--card-bg);
            border: 1px solid rgba(255,255,255,0.08);
            border-radius: var(--radius-md);
            padding: 2rem;
            margin-bottom: 2rem;
            transition: all 0.3s ease;
        }
.privacy-card:hover {
            border-color: rgba(56,189,248,0.3);
            box-shadow: var(--shadow);
        }
.privacy-card p {
            color: rgba(226,232,240,0.85);
            line-height: 1.8;
            margin-bottom: 1rem;
        }
.privacy-card ul {
            color: rgba(226,232,240,0.85);
            line-height: 1.8;
            padding-left: 1.5rem;
        }
.privacy-card li {
            margin-bottom: 0.5rem;
        }
.privacy-card strong {
            color: var(--text);
        }
.privacy-highlight {
            background: rgba(56,189,248,0.08);
            border-left: 4px solid var(--primary);
            padding: 1rem 1.5rem;
            border-radius: 0 var(--radius-md) var(--radius-md) 0;
            margin: 1.5rem 0;
        }
.privacy-highlight p {
            margin-bottom: 0;
        }
.privacy-tag {
            display: inline-block;
            padding: 0.25rem 0.75rem;
            background: rgba(56,189,248,0.1);
            color: var(--primary);
            border-radius: var(--radius-pill);
            font-size: 0.85rem;
            font-weight: 500;
            margin-right: 0.5rem;
            margin-bottom: 0.5rem;
            border: 1px solid rgba(56,189,248,0.2);
        }
.privacy-section {
                padding: 50px 0;
            }
.privacy-card {
                padding: 1.5rem;
            }