:root {
    --primary: #818cf8;
    --accent: #c084fc;
    --bg: #1e1b4b;
    --text: #e0e7ff;
    --text-muted: #a5b0e0;
    --card-bg: #2a2560;
    --border-light: rgba(129, 140, 248, 0.2);
    --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 10px 25px rgba(0, 0, 0, 0.4);
    --radius: 8px;
  }

  * {
    font-family: 'Inter', sans-serif;
  }

  body {
    background-color: var(--bg);
    color: var(--text);
    overflow-x: hidden;
  }

  /* 渐变光晕背景 */
  body::before {
    content: "";
    position: fixed;
    top: -20%;
    left: -10%;
    width: 50vw;
    height: 50vw;
    background: radial-gradient(circle, rgba(192, 132, 252, 0.15) 0%, transparent 60%);
    z-index: -1;
    pointer-events: none;
  }

  body::after {
    content: "";
    position: fixed;
    bottom: -20%;
    right: -10%;
    width: 60vw;
    height: 60vw;
    background: radial-gradient(circle, rgba(129, 140, 248, 0.15) 0%, transparent 60%);
    z-index: -1;
    pointer-events: none;
  }

  /* 吸顶导航 */
  .navbar-custom {
    background: rgba(30, 27, 75, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-light);
    padding: 0.8rem 0;
  }

  .navbar-brand {
    font-weight: 800;
    font-size: 1.6rem;
    letter-spacing: -0.02em;
    color: var(--text) !important;
  }

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

  .nav-link {
    color: var(--text) !important;
    font-weight: 500;
    margin: 0 0.6rem;
    transition: color 0.2s;
  }

  .nav-link:hover {
    color: var(--accent) !important;
  }

  /* Hero */
  .hero-section {
    padding: 6rem 0 4rem;
    position: relative;
  }

  .hero-title {
    font-size: 3.8rem;
    font-weight: 900;
    letter-spacing: -0.02em;
    line-height: 1.1;
    background: linear-gradient(to right, var(--text), var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  .hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-muted);
    max-width: 560px;
    margin-top: 1.5rem;
    font-weight: 400;
  }

  .btn-glow {
    padding: 0.7rem 1.8rem;
    border-radius: var(--radius);
    font-weight: 600;
    border: none;
    transition: 0.2s;
  }

  .btn-primary-custom {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 0 15px rgba(129, 140, 248, 0.5);
  }

  .btn-primary-custom:hover {
    background: var(--accent);
    transform: translateY(-3px);
    box-shadow: 0 0 25px rgba(192, 132, 252, 0.5);
  }

  .btn-outline-custom {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
  }

  .btn-outline-custom:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-3px);
  }

  /* 双色块分屏 */
  .split-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    border: 1px solid var(--border-light);
    padding: 2.5rem;
    box-shadow: var(--shadow-sm);
    height: 100%;
    transition: transform 0.3s, box-shadow 0.3s;
    position: relative;
    overflow: hidden;
  }

  .split-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-md);
  }

  .split-card i {
    color: var(--accent);
  }

  /* 区块通用 */
  .section-padding {
    padding: 5rem 0;
  }

  .section-title {
    font-weight: 800;
    font-size: 2.5rem;
    margin-bottom: 1.2rem;
    letter-spacing: -0.02em;
  }

  .text-muted-light {
    color: var(--text-muted);
  }

  .border-line {
    border-bottom: 1px solid var(--border-light);
    padding-bottom: 3rem;
  }

  /* 表格 */
  .table-custom {
    border: 1px solid var(--border-light);
    border-radius: var(--radius);
    background: var(--card-bg);
    overflow: hidden;
  }

  .table-custom .table-header {
    background: rgba(129, 140, 248, 0.1);
    font-weight: 700;
  }

  .table-custom .table-cell {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-light);
  }

  .table-custom .table-cell:last-child {
    border-bottom: none;
  }

  .highlight {
    color: var(--accent);
    font-weight: 600;
  }

  .font-mono {
    font-family: 'SF Mono', 'Fira Code', monospace;
  }

  /* 图标列表 */
  .feature-icon {
    font-size: 2.2rem;
    color: var(--accent);
    margin-bottom: 0.8rem;
  }

  .feature-item {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 1.8rem;
    border: 1px solid var(--border-light);
    transition: all 0.3s;
    height: 100%;
  }

  .feature-item:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary);
  }

  /* 手风琴 */
  .accordion-item-custom {
    background: var(--card-bg);
    border: 1px solid var(--border-light);
    border-radius: var(--radius);
    margin-bottom: 0.8rem;
    overflow: hidden;
  }

  .accordion-title {
    padding: 1.2rem 1.5rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: transparent;
    transition: 0.2s;
  }

  .accordion-title:hover {
    background: rgba(129, 140, 248, 0.05);
  }

  .accordion-content {
    max-height: 0;
    padding: 0 1.5rem;
    transition: max-height 0.4s ease;
    overflow: hidden;
    color: var(--text-muted);
  }

  .accordion-item-custom.active .accordion-content {
    max-height: 200px;
    padding-bottom: 1.2rem;
  }

  .accordion-item-custom .fa-chevron-down {
    transition: transform 0.3s;
  }

  .accordion-item-custom.active .fa-chevron-down {
    transform: rotate(180deg);
  }

  /* CTA */
  .cta-box {
    background: linear-gradient(120deg, #2a2560, #1e1b4b);
    border: 1px solid var(--border-light);
    border-radius: calc(var(--radius) * 2);
    padding: 3rem;
  }

  /* 回到顶部 */
  #backToTop {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 48px;
    height: 48px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 50%;
    font-size: 1.2rem;
    opacity: 0;
    visibility: hidden;
    transition: 0.3s;
    z-index: 999;
    box-shadow: var(--shadow-md);
  }

  #backToTop.show {
    opacity: 1;
    visibility: visible;
  }

  /* 滚动动画 */
  .reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s, transform 0.6s;
  }

  .reveal.visible {
    opacity: 1;
    transform: translateY(0);
  }

  footer {
    border-top: 1px solid var(--border-light);
    background: #1a1738;
    padding: 2rem 0;
    color: var(--text-muted);
  }

  footer a {
    color: var(--text);
    text-decoration: none;
  }

  .friend-links {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 1.5rem;
    border: 1px solid var(--border-light);
  }

  /* 移动端调整 */
  @media (max-width: 768px) {
    .hero-title {
      font-size: 2.5rem;
    }
  }

/* --- 子页面追加 --- */
.about-hero {
            background: linear-gradient(135deg, rgba(30, 27, 75, 0.9), rgba(129, 140, 248, 0.2));
            border-bottom: 1px solid var(--border-light);
        }
.about-section {
            padding: 80px 0;
        }
.about-card {
            background: var(--card-bg);
            border: 1px solid var(--border-light);
            border-radius: var(--radius);
            padding: 32px;
            height: 100%;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
.about-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
.stat-card {
            text-align: center;
            padding: 24px 16px;
            background: rgba(129, 140, 248, 0.08);
            border: 1px solid var(--border-light);
            border-radius: var(--radius);
        }
.stat-number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 8px;
        }
.stat-label {
            color: var(--text-muted);
            font-size: 0.95rem;
        }
.timeline-item {
            position: relative;
            padding-left: 32px;
            margin-bottom: 32px;
        }
.timeline-item::before {
            content: '';
            position: absolute;
            left: 0;
            top: 8px;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: var(--primary);
            box-shadow: 0 0 0 4px rgba(129, 140, 248, 0.2);
        }
.timeline-item::after {
            content: '';
            position: absolute;
            left: 5px;
            top: 28px;
            width: 2px;
            height: calc(100% - 20px);
            background: var(--border-light);
        }
.timeline-item:last-child::after {
            display: none;
        }
.timeline-date {
            color: var(--accent);
            font-weight: 600;
            font-size: 0.9rem;
            margin-bottom: 4px;
        }
.timeline-text {
            color: var(--text-muted);
            line-height: 1.8;
        }
.value-icon {
            width: 56px;
            height: 56px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background: rgba(129, 140, 248, 0.12);
            color: var(--primary);
            font-size: 1.4rem;
            margin-bottom: 16px;
        }
.about-quote {
            border-left: 3px solid var(--accent);
            padding: 24px;
            background: rgba(192, 132, 252, 0.08);
            border-radius: 0 var(--radius) var(--radius) 0;
            margin: 32px 0;
        }
.about-quote p {
            font-size: 1.05rem;
            color: var(--text);
            font-style: italic;
            line-height: 1.8;
            margin-bottom: 8px;
        }
.about-quote .quote-author {
            color: var(--text-muted);
            font-size: 0.9rem;
            text-align: right;
        }
.about-section {
                padding: 48px 0;
            }
.stat-number {
                font-size: 2rem;
            }

/* --- 子页面追加 --- */
/* 本页专属少量样式 */
        .privacy-section { max-width: 860px; margin: 0 auto; }
.privacy-section h2 { margin-top: 2.5rem; margin-bottom: 1rem; }
.privacy-section h3 { margin-top: 1.8rem; margin-bottom: 0.8rem; color: var(--primary); }
.privacy-section p { line-height: 1.8; margin-bottom: 1rem; }
.privacy-section ul, .privacy-section ol { margin-bottom: 1.2rem; padding-left: 1.5rem; }
.privacy-section li { margin-bottom: 0.4rem; line-height: 1.7; }
.privacy-note { background: var(--card-bg); border: 1px solid var(--border-light); border-radius: var(--radius); padding: 1.2rem 1.5rem; margin: 1.5rem 0; }
.privacy-note i { color: var(--accent); margin-right: 0.5rem; }
.last-updated { color: var(--text-muted); font-size: 0.9rem; font-style: italic; margin-bottom: 2rem; }
.table-custom th, .table-custom td { border: 1px solid var(--border-light); padding: 0.8rem 1rem; text-align: left; }
.table-custom th { background: rgba(129, 140, 248, 0.15); color: var(--text); }
.table-custom td { background: rgba(0, 0, 0, 0.2); color: var(--text); }

/* --- 子页面追加 --- */
.legal-card {
            background: var(--card-bg);
            border: 1px solid var(--border-light);
            border-radius: var(--radius);
            padding: 2.5rem;
            margin-bottom: 2rem;
            box-shadow: var(--shadow-sm);
        }
.legal-card h2 {
            color: var(--primary);
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 1.2rem;
            padding-bottom: 0.8rem;
            border-bottom: 2px solid var(--border-light);
        }
.legal-card p, .legal-card li {
            color: var(--text);
            line-height: 1.9;
            margin-bottom: 1rem;
        }
.legal-card ul {
            padding-left: 1.5rem;
        }
.legal-card li {
            margin-bottom: 0.6rem;
        }
.legal-card strong {
            color: var(--accent);
            font-weight: 600;
        }
.highlight-box {
            background: rgba(129, 140, 248, 0.08);
            border-left: 4px solid var(--primary);
            padding: 1.5rem 1.8rem;
            border-radius: 0 var(--radius) var(--radius) 0;
            margin: 1.5rem 0;
        }
.highlight-box p {
            margin-bottom: 0;
        }
.page-header {
            text-align: center;
            padding: 5rem 0 3rem;
            position: relative;
        }
.page-header h1 {
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--text);
            margin-bottom: 1rem;
            letter-spacing: -0.02em;
        }
.page-header .header-line {
            width: 80px;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            margin: 0 auto 1.5rem;
            border-radius: 2px;
        }
.page-header p {
            color: var(--text-muted);
            font-size: 1.1rem;
            max-width: 700px;
            margin: 0 auto;
        }
.back-home {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            color: var(--primary);
            text-decoration: none;
            font-weight: 500;
            transition: all 0.3s ease;
            margin-top: 2rem;
        }
.back-home:hover {
            color: var(--accent);
            transform: translateX(-4px);
        }
.page-header h1 {
                font-size: 2rem;
            }
.legal-card {
                padding: 1.5rem;
            }