:root {
      --main: #38bdf8;
      --accent: #a78bfa;
      --bg: #0f172a;
      --text: #e2e8f0;
      --card-bg: rgba(30, 41, 59, 0.7);
      --deep-shadow: 0 20px 30px -10px rgba(2, 6, 23, 0.8);
      --glow-highlight: linear-gradient(145deg, rgba(56,189,248,0.15) 0%, rgba(167,139,250,0.1) 100%);
      --wave-divider: rgba(15,23,42,0.9);
    }
    body {
      background-color: var(--bg);
      color: var(--text);
      font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
      font-weight: 400;
      line-height: 1.75;
      letter-spacing: 0.01em;
      overflow-x: hidden;
    }
    h1, h2, h3, h4, .display-font, .brand-font {
      font-family: 'ZCOOL KuaiLe', 'Inter', sans-serif;
      font-weight: 500;
      letter-spacing: 0.02em;
      color: #fff;
    }
    a { color: var(--main); text-decoration: none; }
    a:hover { color: var(--accent); }

    /* 吸顶锚点导航 */
    .sticky-nav {
      position: sticky;
      top: 0;
      z-index: 1030;
      background: rgba(15, 23, 42, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(56, 189, 248, 0.2);
      box-shadow: 0 10px 30px -15px rgba(0,0,0,0.6);
      padding: 0.5rem 0;
    }
    .navbar-brand {
      font-size: 1.8rem;
      font-weight: 700;
      color: #fff !important;
      letter-spacing: 1px;
      text-shadow: 3px 3px 0 var(--accent);
    }
    .navbar-brand i {
      color: var(--main);
      margin-right: 0.3rem;
      filter: drop-shadow(0 0 8px var(--main));
    }
    .nav-link-custom {
      color: #cbd5e1 !important;
      font-weight: 500;
      margin: 0 0.4rem;
      transition: all 0.2s ease;
      border-radius: 30px;
      padding: 0.4rem 1rem !important;
      background: transparent;
    }
    .nav-link-custom:hover {
      color: var(--main) !important;
      background: rgba(56,189,248,0.1);
      box-shadow: inset 0 0 0 1px rgba(56,189,248,0.3);
    }

    /* 拟物厚重风格卡片、按钮 */
    .hero-section {
      padding: 6rem 0 5rem;
      background: 
        radial-gradient(circle at 20% 30%, rgba(56,189,248,0.1), transparent 45%),
        radial-gradient(circle at 80% 70%, rgba(167,139,250,0.1), transparent 50%);
      border-bottom: 4px solid rgba(56,189,248,0.2);
      box-shadow: inset 0 -40px 60px -50px rgba(0,0,0,0.8);
    }
    .hero-title {
      font-size: 3.6rem;
      line-height: 1.2;
      text-shadow: 0 6px 20px rgba(56,189,248,0.3), 0 0 40px rgba(167,139,250,0.2);
      margin-bottom: 1rem;
    }
    .hero-sub {
      font-size: 1.4rem;
      color: #b6c2d6;
      font-weight: 300;
      max-width: 650px;
      margin: 1rem auto 2.5rem;
    }
    .btn-heavy {
      background: linear-gradient(145deg, #2d4b6e, #1b2b41);
      border: 1px solid rgba(56,189,248,0.5);
      color: #f1f5f9;
      padding: 0.9rem 2.2rem;
      font-weight: 600;
      border-radius: 60px;
      box-shadow: 0 12px 20px -8px rgba(0, 0, 0, 0.7), inset 0 1px 2px rgba(255,255,255,0.2);
      transition: all 0.25s ease;
      margin: 0 0.3rem;
    }
    .btn-heavy:hover {
      transform: translateY(-3px);
      box-shadow: 0 20px 30px -10px rgba(56,189,248,0.3), inset 0 1px 2px rgba(255,255,255,0.2);
      color: #fff;
      background: linear-gradient(145deg, #2b4a6e, #15273b);
    }
    .btn-outline-heavy {
      background: transparent;
      border: 2px solid var(--accent);
      color: var(--accent);
      padding: 0.8rem 2rem;
      border-radius: 60px;
      font-weight: 600;
      box-shadow: 0 5px 15px -5px rgba(167,139,250,0.2);
    }
    .btn-outline-heavy:hover {
      background: rgba(167,139,250,0.1);
      color: #fff;
      border-color: var(--main);
    }

    /* 斜切分割 */
    .section-divider {
      position: relative;
      padding: 4rem 0 5rem;
      background: var(--bg);
    }
    .section-divider::before {
      content: '';
      position: absolute;
      top: -1px;
      left: 0;
      width: 100%;
      height: 40px;
      background: linear-gradient(135deg, var(--bg) 0%, var(--bg) 50%, transparent 50%);
      z-index: 2;
    }
    .section-divider::after {
      content: '';
      position: absolute;
      bottom: -1px;
      left: 0;
      width: 100%;
      height: 40px;
      background: linear-gradient(-135deg, var(--bg) 0%, var(--bg) 50%, transparent 50%);
      z-index: 2;
    }

    /* 卡片拟物感 */
    .heavy-card {
      background: var(--card-bg);
      backdrop-filter: blur(4px);
      border-radius: 28px;
      padding: 2rem 1.8rem;
      border: 1px solid rgba(56, 189, 248, 0.2);
      box-shadow: 10px 15px 25px -8px rgba(0,0,0,0.7), inset 0 0 0 1px rgba(255,255,255,0.05);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      height: 100%;
    }
    .heavy-card:hover {
      transform: translateY(-10px);
      box-shadow: 0 30px 40px -10px rgba(0,0,0,0.8), 0 0 0 1px rgba(56,189,248,0.2), 0 0 40px -10px rgba(56,189,248,0.3);
    }
    .icon-badge {
      font-size: 2.5rem;
      background: var(--glow-highlight);
      width: 70px;
      height: 70px;
      border-radius: 30px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--main);
      box-shadow: 0 10px 20px -10px rgba(56,189,248,0.5);
      margin-bottom: 1.5rem;
    }
    .icon-badge .fa-solid { filter: drop-shadow(0 0 6px var(--main)); }

    /* 手风琴(使用说明) */
    .accordion-custom .accordion-item {
      background: rgba(15,23,42,0.6);
      border: 1px solid rgba(56,189,248,0.2);
      border-radius: 16px !important;
      margin-bottom: 1rem;
      overflow: hidden;
      box-shadow: 0 10px 15px -10px rgba(0,0,0,0.5);
    }
    .accordion-custom .accordion-button {
      background: transparent;
      color: var(--text);
      font-weight: 600;
      padding: 1.2rem 1.5rem;
      font-size: 1.15rem;
    }
    .accordion-custom .accordion-button:not(.collapsed) {
      background: rgba(56,189,248,0.05);
      color: var(--main);
    }
    .accordion-custom .accordion-button:focus { box-shadow: none; }

    /* FAQ */
    .faq-item {
      background: rgba(15,23,42,0.7);
      border-left: 5px solid var(--main);
      border-radius: 0 18px 18px 0;
      padding: 1.3rem 1.5rem;
      margin-bottom: 1.2rem;
      box-shadow: 8px 8px 20px -10px rgba(0,0,0,0.7);
      transition: all 0.2s;
    }
    .faq-item:hover { border-left-color: var(--accent); transform: translateX(5px); }

    /* 波浪装饰 */
    .wave-gap {
      position: relative;
      height: 80px;
      background: transparent;
      margin-top: -40px;
      z-index: 5;
    }
    .wave-gap svg { display: block; width: 100%; height: 100%; fill: var(--bg); }

    /* 回顶部按钮 */
    #backToTop {
      position: fixed;
      bottom: 30px;
      right: 30px;
      width: 55px;
      height: 55px;
      border-radius: 50%;
      background: linear-gradient(145deg, var(--main), #0e7490);
      color: white;
      border: none;
      font-size: 1.8rem;
      box-shadow: 0 15px 25px -8px rgba(0,0,0,0.7);
      opacity: 0;
      visibility: hidden;
      transform: translateY(20px);
      transition: all 0.35s ease;
      z-index: 1050;
    }
    #backToTop.show {
      opacity: 1;
      visibility: visible;
      transform: translateY(0);
    }

    /* 滚动渐显 */
    .fade-up {
      opacity: 0;
      transform: translateY(30px);
      transition: opacity 0.7s cubic-bezier(0.22,1,0.36,1), transform 0.7s cubic-bezier(0.22,1,0.36,1);
    }
    .fade-up.visible {
      opacity: 1;
      transform: translateY(0);
    }

    /* 卡片延迟工具 */
    .delay-1 { transition-delay: 0.1s; }
    .delay-2 { transition-delay: 0.2s; }
    .delay-3 { transition-delay: 0.3s; }
    .delay-4 { transition-delay: 0.4s; }

    .footer-links a {
      color: #9aa9bd;
      margin: 0 1rem;
      transition: color 0.2s;
    }
    .footer-links a:hover { color: var(--main); }

/* --- 子页面追加 --- */
/* 页面专属补充样式 */
        .about-hero {
            padding: 100px 0 60px;
            background: radial-gradient(ellipse at 20% 50%, rgba(56,189,248,0.12) 0%, transparent 55%), radial-gradient(ellipse at 80% 20%, rgba(167,139,250,0.1) 0%, transparent 50%);
        }
.about-section {
            padding: 60px 0;
        }
.about-section-alt {
            background: rgba(30, 41, 59, 0.35);
            border-top: 1px solid rgba(148, 163, 184, 0.08);
            border-bottom: 1px solid rgba(148, 163, 184, 0.08);
        }
.about-title {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--text);
            margin-bottom: 20px;
            line-height: 1.25;
        }
.about-title span {
            color: var(--main);
        }
.about-subtitle {
            font-size: 1.1rem;
            color: rgba(226, 232, 240, 0.7);
            max-width: 720px;
            margin: 0 auto 40px;
            line-height: 1.8;
        }
.about-card {
            background: var(--card-bg);
            border: 1px solid rgba(148, 163, 184, 0.12);
            border-radius: 16px;
            padding: 30px;
            height: 100%;
            backdrop-filter: blur(10px);
            transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
        }
.about-card:hover {
            transform: translateY(-4px);
            border-color: rgba(56, 189, 248, 0.3);
            box-shadow: var(--deep-shadow);
        }
.about-card-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: var(--glow-highlight);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            color: var(--main);
            margin-bottom: 18px;
        }
.about-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 12px;
        }
.about-card p {
            font-size: 0.95rem;
            color: rgba(226, 232, 240, 0.75);
            line-height: 1.7;
            margin-bottom: 0;
        }
.about-card p a {
            color: var(--main);
            text-decoration: none;
        }
.about-card p a:hover {
            text-decoration: underline;
        }
.about-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }
.about-list li {
            position: relative;
            padding-left: 28px;
            margin-bottom: 14px;
            color: rgba(226, 232, 240, 0.8);
            line-height: 1.7;
            font-size: 0.95rem;
        }
.about-list li::before {
            content: '\f00c';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            position: absolute;
            left: 0;
            top: 2px;
            color: var(--main);
            font-size: 0.85rem;
        }
.about-stats {
            display: flex;
            gap: 40px;
            justify-content: center;
            flex-wrap: wrap;
            margin: 40px 0;
        }
.about-stat {
            text-align: center;
        }
.about-stat-num {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--main);
            line-height: 1.2;
        }
.about-stat-label {
            font-size: 0.9rem;
            color: rgba(226, 232, 240, 0.6);
            margin-top: 4px;
        }
.about-quote {
            border-left: 3px solid var(--accent);
            padding: 20px 24px;
            background: rgba(167, 139, 250, 0.06);
            border-radius: 0 12px 12px 0;
            margin: 30px 0;
            font-style: italic;
            color: rgba(226, 232, 240, 0.85);
            font-size: 1.05rem;
            line-height: 1.8;
        }
.about-quote strong {
            color: var(--accent);
            font-style: normal;
        }
.about-hero { padding: 70px 0 40px; }
.about-title { font-size: 1.9rem; }
.about-section { padding: 40px 0; }
.about-stats { gap: 24px; }
.about-stat-num { font-size: 1.7rem; }

/* --- 子页面追加 --- */
/* 本页专属补充样式(极少量) */
        .disclaimer-hero { padding: 120px 0 80px; }
.disclaimer-section { margin-bottom: 40px; }
.disclaimer-section .heavy-card { padding: 2rem; border-radius: 16px; }
.disclaimer-section h2 { color: var(--main); font-weight: 700; margin-bottom: 1.2rem; }
.disclaimer-section p { line-height: 1.9; color: var(--text); opacity: .9; }
.disclaimer-section ul { padding-left: 1.2rem; color: var(--text); opacity: .85; line-height: 1.8; }
.disclaimer-section li { margin-bottom: .5rem; }
.notice-box { border-left: 4px solid var(--accent); padding: 1rem 1.5rem; background: rgba(167,139,250,.08); border-radius: 0 12px 12px 0; }
.last-updated { color: var(--text); opacity: .6; font-size: .9rem; }
.disclaimer-hero { padding: 100px 0 50px; }

/* --- 子页面追加 --- */
.guide-section { padding: 80px 0; }
.guide-section:nth-child(even) { background: rgba(15, 23, 42, 0.4); }
.guide-card { background: var(--card-bg); border: 1px solid rgba(56, 189, 248, 0.15); border-radius: 16px; padding: 32px; margin-bottom: 24px; transition: transform 0.3s ease, box-shadow 0.3s ease; }
.guide-card:hover { transform: translateY(-4px); box-shadow: var(--deep-shadow); }
.guide-icon { font-size: 2rem; color: var(--main); margin-bottom: 16px; }
.step-number { display: inline-flex; align-items: center; justify-content: center; width: 36px; height: 36px; border-radius: 50%; background: linear-gradient(135deg, var(--main), var(--accent)); color: #fff; font-weight: 700; margin-right: 12px; flex-shrink: 0; }
.step-item { display: flex; align-items: flex-start; margin-bottom: 16px; }
.tip-box { background: var(--glow-highlight); border-left: 4px solid var(--accent); padding: 20px 24px; border-radius: 0 12px 12px 0; margin: 24px 0; }
.mode-toggle { display: inline-flex; gap: 8px; flex-wrap: wrap; }
.mode-pill { padding: 8px 20px; border-radius: 20px; background: rgba(56, 189, 248, 0.1); border: 1px solid rgba(56, 189, 248, 0.3); color: var(--text); font-size: 0.9rem; }
.mode-pill i { color: var(--main); margin-right: 6px; }
.guide-toc { background: var(--card-bg); border: 1px solid rgba(167, 139, 250, 0.2); border-radius: 16px; padding: 28px; position: sticky; top: 100px; }
.guide-toc h4 { color: var(--main); margin-bottom: 20px; font-size: 1.2rem; }
.guide-toc a { color: var(--text); text-decoration: none; display: block; padding: 8px 0; border-bottom: 1px solid rgba(226, 232, 240, 0.08); transition: color 0.2s; }
.guide-toc a:hover { color: var(--main); }
.guide-toc a i { color: var(--accent); margin-right: 10px; font-size: 0.85rem; }
.reading-tip { background: rgba(167, 139, 250, 0.1); border: 1px solid rgba(167, 139, 250, 0.25); border-radius: 12px; padding: 16px 20px; margin: 16px 0; }
.reading-tip i { color: var(--accent); margin-right: 8px; }
.guide-toc { position: static; margin-bottom: 40px; }
.guide-hero { background: linear-gradient(135deg, rgba(56, 189, 248, 0.1) 0%, rgba(167, 139, 250, 0.1) 100%); border-radius: 20px; padding: 60px 40px; text-align: center; margin-bottom: 60px; border: 1px solid rgba(56, 189, 248, 0.2); }
.guide-hero h1 { font-size: 2.8rem; font-weight: 800; background: linear-gradient(135deg, var(--main), var(--accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; margin-bottom: 20px; }
.guide-hero p { font-size: 1.1rem; color: var(--text); max-width: 700px; margin: 0 auto; opacity: 0.9; }

/* --- Bootstrap 组件配色适配(程序自动补,避免白底黑字) --- */
.accordion-body { background:transparent !important; color:#e2e8f0 !important; }
.accordion-header { background:transparent !important; }