:root {
    --primary: #22d3ee;
    --accent: #fb923c;
    --bg: #0f172a;
    --text: #e2e8f0;
    --bg-light: #1e293b;
    --bg-card: #273449;
    --border-glow: rgba(34, 211, 238, 0.4);
    --shadow-deep: 0 20px 40px rgba(0, 0, 0, 0.5), 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.3);
  }

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

  body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    overflow-x: hidden;
    line-height: 1.7;
  }

  /* 拟物厚重感全局投影 */
  .card, .step-card, .feature-card, .faq-item, .nav-container, footer {
    box-shadow: var(--shadow-deep);
  }

  /* 背景装饰光斑 */
  .bg-decoration {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
  }
  .bg-decoration::before,
  .bg-decoration::after {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    filter: blur(150px);
    opacity: 0.2;
  }
  .bg-decoration::before {
    background: var(--primary);
    top: -200px;
    right: -100px;
  }
  .bg-decoration::after {
    background: var(--accent);
    bottom: -200px;
    left: -100px;
  }

  .container-content {
    position: relative;
    z-index: 2;
  }

  /* 导航 */
  .navbar-custom {
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(34, 211, 238, 0.2);
    padding: 0.8rem 0;
  }
  .navbar-custom .navbar-brand {
    font-weight: 900;
    font-size: 1.6rem;
    color: var(--text);
    letter-spacing: -0.5px;
  }
  .navbar-custom .navbar-brand i {
    color: var(--primary);
    margin-right: 6px;
  }
  .navbar-custom .nav-link {
    color: var(--text);
    font-weight: 500;
    margin: 0 0.5rem;
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    transition: all 0.3s ease;
  }
  .navbar-custom .nav-link:hover {
    color: var(--primary);
    background: rgba(34, 211, 238, 0.08);
  }
  .navbar-toggler {
    border-color: rgba(34, 211, 238, 0.3);
  }
  .navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='%2322d3ee' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
  }

  /* Hero */
  .hero-section {
    position: relative;
    min-height: 92vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background-image: linear-gradient(rgba(15, 23, 42, 0.6), rgba(15, 23, 42, 0.8)), url('{随机图片}');
    background-size: cover;
    background-position: center;
    padding: 120px 0 80px;
    margin-top: 0;
  }
  .hero-section .hero-content {
    max-width: 850px;
    margin: 0 auto;
    padding: 0 20px;
  }
  .hero-section h1 {
    font-size: 4.2rem;
    font-weight: 900;
    color: #ffffff;
    text-shadow: 0 4px 30px rgba(0, 0, 0, 0.5), 0 2px 4px rgba(0, 0, 0, 0.4);
    letter-spacing: -1px;
    margin-bottom: 1rem;
    line-height: 1.15;
  }
  .hero-section .hero-sub {
    font-size: 1.5rem;
    font-weight: 300;
    color: rgba(226, 232, 240, 0.9);
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.4);
    margin-bottom: 2rem;
    letter-spacing: 0.5px;
  }
  .hero-section .hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
  }
  .hero-section .btn {
    font-weight: 600;
    padding: 12px 28px;
    border-radius: 50px;
    font-size: 1.05rem;
    transition: all 0.3s ease;
    border: none;
  }
  .btn-primary-custom {
    background: linear-gradient(135deg, var(--primary), #0ea5b7);
    color: #0f172a;
    box-shadow: 0 4px 20px rgba(34, 211, 238, 0.4);
  }
  .btn-primary-custom:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 8px 30px rgba(34, 211, 238, 0.6);
    color: #0f172a;
  }
  .btn-outline-custom {
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(10px);
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.2) !important;
  }
  .btn-outline-custom:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: var(--primary) !important;
    color: var(--primary);
  }

  /* 区块通用 */
  .section-block {
    padding: 90px 0;
    position: relative;
  }
  .section-header {
    text-align: center;
    margin-bottom: 60px;
  }
  .section-header .section-tag {
    display: inline-block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary);
    background: rgba(34, 211, 238, 0.12);
    padding: 6px 16px;
    border-radius: 30px;
    margin-bottom: 16px;
    letter-spacing: 1px;
    text-transform: uppercase;
  }
  .section-header h2 {
    font-size: 2.8rem;
    font-weight: 800;
    color: #ffffff;
    letter-spacing: -0.5px;
    margin-bottom: 12px;
  }
  .section-header p {
    font-size: 1.15rem;
    color: rgba(226, 232, 240, 0.7);
    max-width: 650px;
    margin: 0 auto;
  }

  /* 使用说明-步骤条 */
  .steps-wrapper {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    position: relative;
  }
  .steps-wrapper::before {
    content: '';
    position: absolute;
    top: 45px;
    left: 15%;
    right: 15%;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    opacity: 0.3;
    border-radius: 2px;
  }
  .step-card {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 40px 28px;
    text-align: center;
    position: relative;
    transition: transform 0.3s ease, border-color 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.05);
  }
  .step-card:hover {
    transform: translateY(-6px);
    border-color: var(--border-glow);
  }
  .step-number {
    font-size: 3.5rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    line-height: 1;
    margin-bottom: 20px;
  }
  .step-card h3 {
    color: #ffffff;
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 12px;
  }
  .step-card p {
    color: rgba(226, 232, 240, 0.75);
    font-size: 0.98rem;
  }

  /* 特色网格卡片 */
  .features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
  }
  .feature-card {
    background: linear-gradient(145deg, var(--bg-card), var(--bg-light));
    border-radius: 24px;
    padding: 38px 28px;
    border: 1px solid rgba(255, 255, 255, 0.06);
    transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    overflow: hidden;
  }
  .feature-card::after {
    content: '';
    position: absolute;
    top: -40%;
    right: -20%;
    width: 100px;
    height: 100px;
    background: var(--primary);
    filter: blur(60px);
    opacity: 0.12;
    border-radius: 50%;
    transition: opacity 0.3s;
  }
  .feature-card:hover {
    transform: scale(1.02);
    border-color: var(--border-glow);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(34, 211, 238, 0.2);
  }
  .feature-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, rgba(34, 211, 238, 0.15), rgba(251, 146, 60, 0.15));
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin-bottom: 22px;
    color: var(--primary);
    border: 1px solid rgba(34, 211, 238, 0.2);
  }
  .feature-card h3 {
    font-size: 1.35rem;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 12px;
  }
  .feature-card p {
    color: rgba(226, 232, 240, 0.75);
    font-size: 0.95rem;
    line-height: 1.6;
  }

  /* 长文区块 */
  .long-article {
    background: linear-gradient(180deg, var(--bg-light), var(--bg));
    border-radius: 32px;
    padding: 50px;
    border: 1px solid rgba(255, 255, 255, 0.05);
  }
  .long-article h2 {
    color: #ffffff;
    font-weight: 800;
    font-size: 2rem;
    margin-bottom: 24px;
  }
  .long-article h2 i {
    color: var(--primary);
    margin-right: 12px;
  }
  .long-article p {
    font-size: 1.05rem;
    line-height: 1.9;
    margin-bottom: 20px;
    color: rgba(226, 232, 240, 0.85);
  }
  .long-article .highlight-stat {
    display: flex;
    gap: 30px;
    margin: 36px 0;
    flex-wrap: wrap;
  }
  .stat-item {
    background: rgba(15, 23, 42, 0.5);
    border-radius: 16px;
    padding: 24px 30px;
    text-align: center;
    flex: 1;
    min-width: 150px;
    border: 1px solid rgba(34, 211, 238, 0.15);
  }
  .stat-number {
    font-size: 2.8rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    display: block;
    line-height: 1.2;
  }
  .stat-label {
    font-size: 0.95rem;
    color: rgba(226, 232, 240, 0.7);
    margin-top: 6px;
  }

  /* FAQ */
  .faq-wrapper {
    max-width: 850px;
    margin: 0 auto;
  }
  .faq-item {
    background: var(--bg-card);
    border-radius: 16px;
    margin-bottom: 16px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: border-color 0.3s;
  }
  .faq-item:hover {
    border-color: rgba(34, 211, 238, 0.3);
  }
  .faq-item summary {
    padding: 24px 28px;
    font-size: 1.1rem;
    font-weight: 600;
    color: #ffffff;
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
  }
  .faq-item summary::-webkit-details-marker {
    display: none;
  }
  .faq-item summary::after {
    content: '+';
    font-size: 2rem;
    color: var(--primary);
    font-weight: 300;
    transition: transform 0.3s;
  }
  .faq-item[open] summary::after {
    transform: rotate(45deg);
  }
  .faq-item .faq-answer {
    padding: 0 28px 24px;
    color: rgba(226, 232, 240, 0.8);
    line-height: 1.8;
  }

  /* CTA */
  .cta-section {
    background: linear-gradient(135deg, rgba(34, 211, 238, 0.12), rgba(251, 146, 60, 0.1));
    border-radius: 30px;
    padding: 60px;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.08);
  }
  .cta-section h2 {
    color: #ffffff;
    font-size: 2.4rem;
    font-weight: 800;
    margin-bottom: 16px;
  }
  .cta-section p {
    font-size: 1.2rem;
    color: rgba(226, 232, 240, 0.8);
    max-width: 600px;
    margin: 0 auto 36px;
  }
  .cta-section .btn {
    font-size: 1.1rem;
    padding: 14px 36px;
  }

  /* 友情链接 */
  .friend-links {
    background: var(--bg-light);
    border-radius: 20px;
    padding: 40px;
    margin-top: 70px;
    border: 1px solid rgba(255, 255, 255, 0.04);
  }
  .friend-links h3 {
    color: #ffffff;
    font-size: 1.4rem;
    margin-bottom: 20px;
    font-weight: 700;
  }
  .friend-links .links-content {
    color: rgba(226, 232, 240, 0.6);
  }

  /* 页脚 */
  .site-footer {
    background: #0a0f1c;
    padding: 50px 0 30px;
    margin-top: 60px;
    border-top: 1px solid rgba(34, 211, 238, 0.15);
  }
  .site-footer .footer-brand {
    font-size: 1.5rem;
    font-weight: 900;
    color: #ffffff;
  }
  .site-footer .footer-brand i {
    color: var(--primary);
    margin-right: 8px;
  }
  .site-footer p {
    color: rgba(226, 232, 240, 0.6);
    font-size: 0.9rem;
  }
  .site-footer .footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 24px;
    margin-top: 16px;
  }
  .site-footer .footer-links a {
    color: rgba(226, 232, 240, 0.7);
    text-decoration: none;
    font-size: 0.95rem;
    transition: color 0.3s;
  }
  .site-footer .footer-links a:hover {
    color: var(--primary);
  }

  /* 滚动动效 */
  .fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
  }
  .fade-in-up.visible {
    opacity: 1;
    transform: translateY(0);
  }

  /* 图片懒加载占位 */
  .lazy-img {
    background: linear-gradient(135deg, var(--bg-light), var(--bg-card));
    position: relative;
    overflow: hidden;
  }
  .lazy-img img {
    opacity: 0;
    transition: opacity 0.5s;
    width: 100%;
    height: 100%;
    object-fit: cover;
  }
  .lazy-img.loaded img {
    opacity: 1;
  }
  .lazy-img::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.06), transparent);
    animation: shimmer 1.5s infinite;
  }
  .lazy-img.loaded::after {
    display: none;
  }
  @keyframes shimmer {
    100% {
      left: 100%;
    }
  }

  @media (max-width: 992px) {
    .features-grid, .steps-wrapper {
      grid-template-columns: repeat(2, 1fr);
    }
    .steps-wrapper::before {
      display: none;
    }
    .hero-section h1 {
      font-size: 3rem;
    }
  }
  @media (max-width: 768px) {
    .features-grid, .steps-wrapper {
      grid-template-columns: 1fr;
    }
    .hero-section h1 {
      font-size: 2.4rem;
    }
    .section-block {
      padding: 60px 0;
    }
    .long-article {
      padding: 30px 20px;
    }
    .cta-section {
      padding: 40px 20px;
    }
    .friend-links {
      padding: 24px;
    }
  }

/* --- 子页面追加 --- */
/* 确保Bootstrap组件配色被覆盖为本站深色主题 (按规范覆盖) */
    .card, .card-body, .card-title, .card-text, .card-header, .card-footer {
      background: var(--bg-card) !important;
      color: var(--text) !important;
      border-color: var(--border-glow) !important;
    }
.list-group-item {
      background: var(--bg-card) !important;
      color: var(--text) !important;
      border-color: var(--border-glow) !important;
    }
.accordion-item, .accordion-button {
      background: var(--bg-card) !important;
      color: var(--text) !important;
      border-color: var(--border-glow) !important;
    }
.accordion-button:not(.collapsed) {
      background: var(--bg-light) !important;
      color: var(--primary) !important;
    }
.form-control, .form-select {
      background: rgba(0,0,0,.35) !important;
      color: var(--text) !important;
      border-color: var(--border-glow) !important;
    }
.form-control::placeholder {
      color: rgba(255,255,255,.45) !important;
    }
.nav-link.active, .nav-link:hover {
      color: var(--primary) !important;
    }
/* 本页特有: 时间线装饰 */
    .about-timeline {
      border-left: 3px solid var(--primary);
      padding-left: 1.5rem;
      margin-left: 0.5rem;
    }
.about-timeline-item {
      position: relative;
      margin-bottom: 2rem;
    }
.about-timeline-item::before {
      content: "";
      position: absolute;
      left: -2.2rem;
      top: 0.3rem;
      width: 14px;
      height: 14px;
      border-radius: 50%;
      background: var(--accent);
      box-shadow: 0 0 12px var(--border-glow);
    }

/* --- 子页面追加 --- */
/* 确保Bootstrap组件不破坏深色主题 */
        .card, .card-body, .card-title, .card-text, .card-header, .card-footer,
        .list-group-item, .accordion-item, .accordion-button, .accordion-body,
        .modal-content, .modal-header, .modal-body, .dropdown-menu, .dropdown-item,
        .form-control, .form-select {
            background: var(--bg-card);
            color: var(--text);
            border-color: var(--border-glow);
        }
.accordion-button::after {
            filter: invert(1);
        }
.nav-link.active {
            color: var(--primary) !important;
            text-shadow: 0 0 8px var(--border-glow);
        }
.terms-article h2 {
            color: var(--primary);
            border-left: 4px solid var(--accent);
            padding-left: 1rem;
            margin-top: 2.5rem;
            font-weight: 700;
            letter-spacing: -0.01em;
        }
.terms-article h3 {
            color: var(--accent);
            font-weight: 600;
            margin-top: 1.8rem;
            font-size: 1.25rem;
        }
.terms-article p, .terms-article li {
            color: var(--text);
            line-height: 1.75;
        }
.terms-article ul {
            padding-left: 1.2rem;
        }
.terms-article li {
            margin-bottom: 0.6rem;
        }
.highlight-box {
            background: rgba(34, 211, 238, 0.08);
            border: 1px solid var(--border-glow);
            border-radius: 12px;
            padding: 1.5rem;
            margin: 2rem 0;
        }
.legal-footer a {
            color: var(--primary);
            text-decoration: none;
            border-bottom: 1px dotted var(--primary);
        }
.legal-footer a:hover {
            color: var(--accent);
            border-bottom-color: var(--accent);
        }
.breadcrumb-nav {
            font-size: 0.9rem;
            color: var(--text);
            opacity: 0.8;
        }
.breadcrumb-nav a {
            color: var(--primary);
            text-decoration: none;
        }
.breadcrumb-nav a:hover {
            text-decoration: underline;
        }

/* --- 子页面追加 --- */
.privacy-section {
            padding: 4rem 0;
            border-bottom: 1px solid var(--border-glow);
        }
.privacy-section:last-child {
            border-bottom: none;
        }
.privacy-content {
            max-width: 900px;
            margin: 0 auto;
        }
.privacy-content h2 {
            color: var(--primary);
            font-size: 1.6rem;
            margin-bottom: 1.5rem;
            font-weight: 700;
            position: relative;
            padding-bottom: 0.5rem;
        }
.privacy-content h2::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 60px;
            height: 2px;
            background: linear-gradient(90deg, var(--primary), transparent);
        }
.privacy-content h3 {
            color: var(--text);
            font-size: 1.2rem;
            margin: 1.5rem 0 1rem;
            font-weight: 600;
        }
.privacy-content p {
            color: var(--text);
            opacity: 0.9;
            line-height: 1.8;
            margin-bottom: 1rem;
        }
.privacy-content ul {
            color: var(--text);
            opacity: 0.9;
            padding-left: 1.5rem;
            margin-bottom: 1rem;
        }
.privacy-content li {
            margin-bottom: 0.5rem;
            line-height: 1.7;
        }
.privacy-content .info-card {
            background: var(--bg-card);
            border: 1px solid var(--border-glow);
            border-radius: 12px;
            padding: 1.5rem;
            margin: 1.5rem 0;
        }
.privacy-content .info-card i {
            color: var(--primary);
            margin-right: 0.5rem;
        }
.privacy-badge {
            display: inline-block;
            background: var(--bg-light);
            border: 1px solid var(--border-glow);
            border-radius: 20px;
            padding: 0.3rem 1rem;
            font-size: 0.85rem;
            color: var(--primary);
            margin-right: 0.5rem;
            margin-bottom: 0.5rem;
        }
.last-updated {
            text-align: center;
            color: var(--text);
            opacity: 0.6;
            font-size: 0.9rem;
            margin-bottom: 2rem;
        }
.privacy-section {
                padding: 3rem 0;
            }
.privacy-content h2 {
                font-size: 1.3rem;
            }
.privacy-content p {
                font-size: 0.95rem;
            }

/* --- 子页面追加 --- */
/* 本页专属补充样式 */
        .legal-section { padding: 3rem 0; }
.legal-section h2 { color: var(--primary); font-weight: 700; margin-bottom: 1.5rem; font-size: 1.6rem; }
.legal-section h3 { color: var(--text); font-weight: 600; margin-top: 1.5rem; margin-bottom: 1rem; font-size: 1.2rem; }
.legal-section p, .legal-section li { color: var(--text); line-height: 1.8; font-size: 0.95rem; }
.legal-section ul, .legal-section ol { padding-left: 1.5rem; margin-bottom: 1.2rem; }
.legal-section li { margin-bottom: 0.6rem; }
.legal-section .card { background: var(--bg-card); border: 1px solid var(--border-glow); border-radius: 12px; padding: 2rem; margin-bottom: 1.5rem; box-shadow: var(--shadow-soft); }
.legal-section .card p:last-child { margin-bottom: 0; }
.legal-section .icon-badge { color: var(--primary); margin-right: 0.5rem; }
.legal-section .important { color: var(--accent); font-weight: 600; }
.legal-section .highlight-box { background: rgba(34, 211, 238, 0.08); border-left: 4px solid var(--primary); padding: 1rem 1.5rem; border-radius: 0 8px 8px 0; margin: 1.5rem 0; }
.legal-section .highlight-box p { margin-bottom: 0.5rem; }
.legal-section .highlight-box p:last-child { margin-bottom: 0; }
.back-home-link { color: var(--primary); text-decoration: none; font-weight: 600; }
.back-home-link:hover { color: var(--accent); text-decoration: underline; }
.legal-footer { margin-top: 2rem; padding-top: 1.5rem; border-top: 1px solid rgba(34, 211, 238, 0.2); }

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