:root {
      --primary: #38bdf8;
      --accent: #a78bfa;
      --bg-dark: #0f172a;
      --text-light: #e2e8f0;
      --radius-xl: 24px;
      --radius-lg: 20px;
      --radius-md: 16px;
      --shadow-soft: 0 15px 35px -10px rgba(0,0,0,0.6);
      --shadow-glow: 0 0 0 1px rgba(56,189,248,0.2), 0 20px 40px -12px rgba(167,139,250,0.3);
    }
    
    * { box-sizing: border-box; }
    body {
      background-color: var(--bg-dark);
      color: var(--text-light);
      font-family: 'Inter', sans-serif;
      font-weight: 400;
      line-height: 1.7;
      letter-spacing: 0.01em;
      overflow-x: hidden;
    }
    
    /* 波浪/斜切分割 */
    .wave-divider {
      position: relative;
      width: 100%;
      height: 80px;
      background: var(--bg-dark);
      margin-top: -1px;
    }
    .wave-divider svg {
      position: absolute;
      bottom: 0;
      width: 100%;
      height: 80px;
      display: block;
    }
    .wave-divider.flip svg { transform: rotate(180deg); }
    .wave-fill { fill: #0f172a; }
    
    /* 大圆角柔和阴影 */
    .soft-card {
      background: rgba(30, 41, 59, 0.7);
      backdrop-filter: blur(8px);
      border-radius: var(--radius-xl);
      box-shadow: var(--shadow-soft);
      border: 1px solid rgba(255,255,255,0.06);
      transition: all 0.3s ease;
    }
    .soft-card:hover {
      transform: scale(1.02);
      border-color: rgba(56,189,248,0.6);
      box-shadow: var(--shadow-glow);
    }
    
    /* 滚动进度条 */
    #scrollProgress {
      position: fixed;
      top: 0; left: 0;
      height: 4px;
      width: 0%;
      background: linear-gradient(90deg, var(--primary), var(--accent));
      z-index: 9999;
      border-radius: 0 10px 10px 0;
      transition: width 0.1s;
    }
    
    /* 导航吸顶背景 */
    .navbar-custom {
      transition: background 0.4s ease, box-shadow 0.2s;
      border-radius: 0;
      padding: 12px 0;
      background: rgba(15, 23, 42, 0.75);
      backdrop-filter: blur(15px);
      box-shadow: 0 8px 20px -10px rgba(0,0,0,0.5);
    }
    .navbar-custom.scrolled {
      background: rgba(15, 23, 42, 0.93);
      box-shadow: 0 10px 25px -8px rgba(0,0,0,0.7);
    }
    .navbar-brand {
      font-weight: 800;
      font-size: 1.8rem;
      color: var(--text-light) !important;
      letter-spacing: -0.5px;
    }
    .navbar-brand i { color: var(--primary); margin-right: 8px; }
    .navbar-nav .nav-link {
      color: rgba(226, 232, 240, 0.75);
      font-weight: 500;
      margin: 0 10px;
      border-radius: 40px;
      padding: 6px 16px;
      transition: 0.2s;
    }
    .navbar-nav .nav-link:hover {
      color: #fff;
      background: rgba(56, 189, 248, 0.15);
    }
    
    /* 打字机 */
    .typewriter {
      display: inline-block;
      overflow: hidden;
      white-space: nowrap;
      border-right: 3px solid var(--primary);
      animation: blink 0.8s step-end infinite;
      max-width: 100%;
    }
    @keyframes blink { 50% { border-color: transparent; } }
    
    /* hero 等字体 */
    h1.display-4 {
      font-weight: 900;
      letter-spacing: -1px;
      color: #f8fafc;
      text-shadow: 0 4px 20px rgba(56,189,248,0.3);
    }
    
    /* 特色卡片图标 */
    .feature-icon {
      font-size: 2.2rem;
      background: linear-gradient(145deg, rgba(56,189,248,0.2), rgba(167,139,250,0.2));
      width: 70px; height: 70px;
      display: flex; align-items: center; justify-content: center;
      border-radius: var(--radius-md);
      margin-bottom: 18px;
      color: var(--primary);
    }
    
    /* 步骤条 横向时间线 */
    .step-line {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      position: relative;
    }
    .step-line::before {
      content: '';
      position: absolute;
      top: 30px;
      left: 8%;
      right: 8%;
      height: 3px;
      background: linear-gradient(90deg, var(--primary), var(--accent));
      opacity: 0.5;
      border-radius: 10px;
    }
    .step-item {
      flex: 0 0 23%;
      text-align: center;
      position: relative;
      z-index: 2;
    }
    .step-dot {
      width: 60px; height: 60px;
      background: #0f172a;
      border: 3px solid var(--primary);
      border-radius: 50%;
      display: flex; align-items: center; justify-content: center;
      font-family: 'Courier New', monospace;
      font-weight: 800;
      font-size: 1.5rem;
      color: var(--primary);
      margin: 0 auto 15px;
      box-shadow: 0 0 0 6px rgba(56,189,248,0.1);
    }
    
    /* FAQ 折叠面板 */
    .faq-item {
      background: #1e293b;
      border-radius: var(--radius-md);
      border-left: 4px solid var(--primary);
    }
    .faq-question { font-weight: 600; cursor: pointer; }
    
    /* 尾部友情链接区 */
    .friend-links a {
      color: var(--primary);
      margin: 0 8px;
      text-decoration: none;
    }
    .friend-links a:hover { text-decoration: underline; }
    
    /* 等宽字体数据 */
    .mono {
      font-family: 'SF Mono', 'Fira Code', 'Courier New', monospace;
      letter-spacing: 0.5px;
    }
    
    footer { background: #0b1120; }
    
    /* 波浪分隔具体应用 */
    .section-wave-top { margin-top: -70px; }
    
    h2 { font-weight: 800; letter-spacing: -0.4px; }

/* --- 子页面追加 --- */
/* 由于复用站内样式, 这里仅针对本页特殊元素做微调, 确保与首页风格统一 */
        .about-hero {
            padding: 5rem 0 3rem;
            position: relative;
        }
.about-hero h1 {
            font-weight: 800;
            letter-spacing: -0.02em;
            line-height: 1.2;
        }
.section-title-wrap {
            margin-bottom: 2.5rem;
        }
.section-title-wrap .badge-custom {
            display: inline-block;
            background: rgba(167, 139, 250, 0.15);
            color: var(--accent);
            padding: 0.35rem 1.2rem;
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 0.3px;
            border: 1px solid rgba(167, 139, 250, 0.3);
            margin-bottom: 1rem;
        }
.icon-bg {
            width: 52px;
            height: 52px;
            border-radius: 18px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            background: linear-gradient(135deg, rgba(56, 189, 248, 0.12), rgba(167, 139, 250, 0.12));
            border: 1px solid rgba(56, 189, 248, 0.2);
        }
.timeline-item {
            position: relative;
            padding-left: 2rem;
            border-left: 2px dashed rgba(56, 189, 248, 0.25);
        }
.timeline-item::before {
            content: "";
            position: absolute;
            left: -7px;
            top: 0.4rem;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: var(--primary);
            box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.2);
        }
.quote-block {
            background: rgba(255, 255, 255, 0.02);
            border-left: 4px solid var(--accent);
            padding: 1.5rem 2rem;
            border-radius: 0 var(--radius-md) var(--radius-md) 0;
        }
.stat-number {
            font-weight: 800;
            color: var(--primary);
            font-size: 1.8rem;
        }
/* 导航 active 高亮 */
        .navbar-custom .nav-link.active {
            color: var(--primary) !important;
            text-shadow: 0 0 12px rgba(56, 189, 248, 0.5);
        }
/* 覆盖 Bootstrap 白底组件 (如有意外) */
        .card, .card-body, .form-control, .list-group-item {
            background: transparent;
            color: var(--text-light);
            border-color: rgba(56, 189, 248, 0.2);
        }
.accordion-item, .accordion-button {
            background: transparent;
            color: var(--text-light);
        }

/* --- 子页面追加 --- */
/* 本页专属微调，沿用站点变量 */
    .subscribe-hero {
      background: radial-gradient(circle at 30% 20%, rgba(56,189,248,0.15), transparent 50%),
                  radial-gradient(circle at 70% 60%, rgba(167,139,250,0.15), transparent 50%);
      padding: 4rem 0 2rem;
    }
.plan-card {
      background: rgba(15, 23, 42, 0.75);
      border: 1px solid rgba(56,189,248,0.2);
      border-radius: var(--radius-xl);
      padding: 2rem 1.8rem;
      backdrop-filter: blur(6px);
      transition: transform .25s ease, box-shadow .25s ease;
      height: 100%;
    }
.plan-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-glow);
    }
.plan-card.popular {
      border-color: var(--accent);
      box-shadow: 0 0 0 1px rgba(167,139,250,0.4), 0 20px 40px -12px rgba(167,139,250,0.25);
    }
.plan-price {
      font-size: 2.6rem;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.02em;
    }
.plan-feature {
      list-style: none;
      padding: 0;
      margin: 1.5rem 0 2rem;
    }
.plan-feature li {
      padding: .4rem 0;
      border-bottom: 1px dashed rgba(148, 163, 184, 0.2);
      font-size: .95rem;
      display: flex;
      align-items: center;
      gap: .5rem;
    }
.plan-feature li i {
      color: var(--accent);
      font-size: .8rem;
      width: 1.2rem;
    }
.subscribe-note {
      background: rgba(167, 139, 250, 0.08);
      border-left: 4px solid var(--accent);
      border-radius: var(--radius-md);
      padding: 1.2rem 1.5rem;
    }
.form-control, .form-select {
      background: rgba(0,0,0,0.35);
      border: 1px solid rgba(56,189,248,0.3);
      color: var(--text-light);
      border-radius: 12px;
      padding: .75rem 1rem;
    }
.form-control:focus, .form-select:focus {
      background: rgba(0,0,0,0.5);
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(56,189,248,0.15);
      color: var(--text-light);
    }
.form-control::placeholder {
      color: rgba(226, 232, 240, 0.5);
    }
.form-select option {
      background: #1e293b;
      color: var(--text-light);
    }
.btn-subscribe {
      background: linear-gradient(135deg, var(--primary), var(--accent));
      border: none;
      color: #0f172a;
      font-weight: 700;
      padding: .8rem 2rem;
      border-radius: 50px;
      letter-spacing: .01em;
      transition: all .2s ease;
    }
.btn-subscribe:hover {
      transform: scale(1.02);
      box-shadow: 0 8px 20px rgba(56,189,248,0.3);
      color: #0f172a;
    }
.faq-border {
      border-bottom: 1px solid rgba(148,163,184,0.15);
      padding: 1rem 0;
    }
.section-title-brand {
      font-weight: 800;
      color: var(--text-light);
      letter-spacing: -0.01em;
    }
.section-title-brand span {
      color: var(--primary);
    }

/* --- 子页面追加 --- */
/* 热榜专用小调整 */
        .rank-card {
            background: rgba(15, 23, 42, 0.75);
            backdrop-filter: blur(6px);
            border: 1px solid rgba(56, 189, 248, 0.2);
            border-radius: var(--radius-lg);
            padding: 1.25rem 1.5rem;
            transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s;
            margin-bottom: 1rem;
            box-shadow: var(--shadow-soft);
        }
.rank-card:hover {
            transform: translateY(-3px);
            border-color: rgba(167, 139, 250, 0.5);
            box-shadow: var(--shadow-glow);
        }
.rank-number {
            font-size: 1.8rem;
            font-weight: 800;
            line-height: 1;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            margin-right: 1rem;
            min-width: 3.2rem;
            display: inline-block;
            text-align: right;
        }
.rank-main {
            flex: 1;
        }
.rank-title {
            font-size: 1.15rem;
            font-weight: 600;
            color: var(--text-light);
            margin-bottom: 0.2rem;
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 0.5rem;
        }
.rank-tag {
            background: rgba(56, 189, 248, 0.15);
            border-radius: 999px;
            padding: 0.2rem 0.75rem;
            font-size: 0.75rem;
            color: var(--primary);
            border: 1px solid rgba(56, 189, 248, 0.25);
            font-weight: 500;
        }
.rank-desc {
            color: rgba(226, 232, 240, 0.8);
            font-size: 0.95rem;
            margin-top: 0.2rem;
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem 1rem;
        }
.rank-meta i {
            color: var(--accent);
            width: 1rem;
            margin-right: 0.3rem;
        }
.rank-meta {
            color: rgba(226, 232, 240, 0.65);
            font-size: 0.85rem;
        }
.rank-item-wrapper {
            display: flex;
            align-items: flex-start;
        }
.trend-up {
            color: #4ade80;
            font-size: 0.85rem;
            font-weight: 600;
        }
.trend-down {
            color: #f87171;
            font-size: 0.85rem;
            font-weight: 600;
        }
.section-tag {
            display: inline-block;
            background: rgba(167, 139, 250, 0.15);
            color: var(--accent);
            padding: 0.25rem 1rem;
            border-radius: 999px;
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 0.3px;
            border: 1px solid rgba(167, 139, 250, 0.3);
            margin-bottom: 1rem;
        }
.category-header {
            border-bottom: 1px solid rgba(56, 189, 248, 0.2);
            padding-bottom: 0.75rem;
            margin-bottom: 1.5rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 0.5rem;
        }
.category-header h2 {
            font-size: 1.75rem;
            font-weight: 800;
            color: var(--text-light);
            margin: 0;
            letter-spacing: -0.5px;
        }
.category-header i {
            color: var(--primary);
            margin-right: 0.5rem;
        }
.update-badge {
            background: rgba(56, 189, 248, 0.12);
            border: 1px solid rgba(56, 189, 248, 0.25);
            color: var(--primary);
            border-radius: 999px;
            padding: 0.3rem 1rem;
            font-size: 0.8rem;
            font-weight: 500;
        }
.hot-flag {
            background: linear-gradient(145deg, rgba(250, 204, 21, 0.2), rgba(245, 158, 11, 0.15));
            border: 1px solid rgba(250, 204, 21, 0.3);
            color: #fbbf24;
            padding: 0.15rem 0.6rem;
            border-radius: 999px;
            font-size: 0.7rem;
            font-weight: 700;
            margin-left: 0.5rem;
            letter-spacing: 0.5px;
        }
/* 手动覆盖 Bootstrap 可能出现的白底 */
        .rank-card, .rank-card * { background: transparent; }
.rank-card { background: rgba(15, 23, 42, 0.75); }
.rank-card .rank-title, .rank-card .rank-desc { color: inherit; }
.rank-card .rank-desc { color: rgba(226, 232, 240, 0.8); }
.rank-card .rank-title { color: var(--text-light); }

/* --- 子页面追加 --- */
/* 覆盖 Bootstrap 组件默认白底黑字 —— 本页尽量不用组件类，只用栅格，所以只补少量防御 */
        .card, .card-body, .card-title, .card-text { background: transparent; color: var(--text-light); border: none; }
.accordion-button:not(.collapsed) { background: rgba(56,189,248,0.1); color: var(--primary); }
/* 本页特定布局微调 */
        .disclaimer-section { padding: 3.5rem 0; }
.legal-title { font-weight: 800; letter-spacing: -0.02em; }
.icon-badge { width: 48px; height: 48px; background: rgba(56,189,248,0.1); border-radius: 14px; display: flex; align-items: center; justify-content: center; color: var(--primary); font-size: 1.4rem; margin-bottom: 1rem; }
.divider-light { height: 1px; background: linear-gradient(90deg, transparent, rgba(56,189,248,0.4), transparent); margin: 2.5rem 0; }
.muted-text { color: rgba(226,232,240,0.7); }

/* --- 子页面追加 --- */
/* 确保所有卡片/容器继承深色主题 */
    .soft-card, .faq-item, .accordion-item, .list-group-item {
      background: rgba(15, 23, 42, 0.7);
      backdrop-filter: blur(6px);
      border: 1px solid rgba(56, 189, 248, 0.15);
      border-radius: var(--radius-lg);
      color: var(--text-light);
      transition: transform .2s, box-shadow .2s;
    }
.policy-section-title {
      color: var(--primary);
      font-weight: 700;
      letter-spacing: -0.02em;
      border-left: 4px solid var(--accent);
      padding-left: 1rem;
      margin-top: 2.5rem;
      margin-bottom: 1.25rem;
    }
.muted-icon {
      color: var(--accent);
      margin-right: 0.5rem;
    }
.policy-list {
      list-style: none;
      padding-left: 0;
    }
.policy-list li {
      padding: 0.4rem 0 0.4rem 1.8rem;
      position: relative;
      border-bottom: 1px dashed rgba(167, 139, 250, 0.2);
    }
.policy-list li::before {
      content: "🍉";
      position: absolute;
      left: 0;
      top: 0.4rem;
      font-size: 1rem;
      opacity: 0.9;
    }
.policy-list li:last-child { border-bottom: none; }
.data-badge {
      background: rgba(167, 139, 250, 0.15);
      padding: 0.3rem 1rem;
      border-radius: 50px;
      font-size: 0.85rem;
      font-weight: 500;
      border: 1px solid rgba(167, 139, 250, 0.3);
      color: var(--accent);
    }
.footer-links a {
      color: var(--text-light);
      text-decoration: none;
      opacity: 0.7;
      transition: 0.2s;
    }
.footer-links a:hover { opacity: 1; color: var(--primary); }
.navbar-custom .nav-link {
      color: var(--text-light);
    }
/* 覆盖 Bootstrap 可能引入的白底 */
    .navbar, .navbar-collapse, .navbar-custom {
      background-color: transparent !important;
    }
.navbar-custom .navbar-toggler {
      border-color: var(--primary);
    }
.accordion-button:focus {
      box-shadow: 0 0 0 1px rgba(56,189,248,0.2);
    }

/* --- Bootstrap 组件配色适配(程序自动补,避免白底黑字) --- */
.table { color:#e2e8f0 !important; border-color:rgba(255,255,255,.12) !important; --bs-table-bg:transparent !important; --bs-table-color:#e2e8f0 !important; }