:root {
      --primary: #818cf8;
      --accent: #c084fc;
      --bg: #1e1b4b;
      --text: #e0e7ff;
      --card-bg: rgba(255, 255, 255, 0.04);
      --radius-lg: 22px;
      --radius-md: 18px;
      --shadow: 0 20px 40px -12px rgba(0, 0, 0, 0.6), 0 4px 18px rgba(0, 0, 0, 0.3);
      --font-mono: 'SF Mono', 'JetBrains Mono', 'Fira Code', monospace;
    }
    * {
      box-sizing: border-box;
    }
    body {
      background-color: var(--bg);
      color: var(--text);
      font-family: 'Inter', sans-serif;
      font-size: 15px;
      line-height: 1.5;
      background-image: radial-gradient(rgba(129, 140, 248, 0.12) 1px, transparent 1px), radial-gradient(rgba(192, 132, 252, 0.08) 1px, transparent 1px);
      background-size: 34px 34px, 68px 68px;
      background-position: 0 0, 17px 17px;
      padding-bottom: 20px;
      overflow-x: hidden;
    }
    /* 大圆角、柔和弥散阴影 */
    .card, .section-box {
      border-radius: var(--radius-lg);
      background: var(--card-bg);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(255, 255, 255, 0.05);
      box-shadow: var(--shadow);
    }
    .hover-lift {
      transition: transform 0.25s ease, border-color 0.3s, background 0.2s;
    }
    .hover-lift:hover {
      transform: scale(1.02) translateY(-2px);
      border-color: rgba(129, 140, 248, 0.7);
      background: rgba(255, 255, 255, 0.06);
    }
    /* 左侧固定侧栏 */
    .sidebar-wrap {
      position: sticky;
      top: 80px;
      height: fit-content;
      border-radius: var(--radius-lg);
      padding: 16px 12px;
    }
    .sidebar-link {
      display: flex;
      align-items: center;
      gap: 10px;
      color: var(--text);
      padding: 10px 14px;
      margin-bottom: 6px;
      border-radius: 999px;
      text-decoration: none;
      font-weight: 500;
      transition: all 0.15s;
      background: transparent;
      border: 1px solid transparent;
    }
    .sidebar-link i {
      width: 24px;
      color: var(--accent);
    }
    .sidebar-link:hover {
      background: rgba(129, 140, 248, 0.12);
      border-color: rgba(192, 132, 252, 0.3);
      color: white;
    }
    /* 顶部导航折叠 */
    .navbar-custom {
      background: rgba(30, 27, 75, 0.75);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(129, 140, 248, 0.25);
      border-radius: 0 0 28px 28px;
      padding: 12px 0;
    }
    .navbar-brand {
      font-weight: 900;
      font-size: 1.7rem;
      letter-spacing: -0.02em;
      color: white;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .navbar-brand i {
      color: var(--accent);
      font-size: 2rem;
    }
    .navbar-toggler {
      border: none;
      color: var(--accent);
    }
    .navbar-toggler:focus {
      box-shadow: none;
    }
    .nav-link-custom {
      color: var(--text) !important;
      margin: 0 8px;
      font-weight: 500;
      border-radius: 50px;
      padding: 8px 16px !important;
    }
    .nav-link-custom:hover {
      color: white !important;
      background: rgba(129, 140, 248, 0.2);
    }
    /* 渐变文字 hero */
    .hero-title {
      font-weight: 900;
      font-size: clamp(2.6rem, 8vw, 4.6rem);
      line-height: 1.1;
      background: linear-gradient(120deg, #e0e7ff 0%, #818cf8 35%, #c084fc 75%, #a78bfa 100%);
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
      display: inline-block;
      position: relative;
      z-index: 2;
    }
    .float-deco {
      position: absolute;
      border-radius: 50%;
      background: rgba(192, 132, 252, 0.2);
      filter: blur(20px);
      z-index: 0;
    }
    .mono {
      font-family: var(--font-mono);
      letter-spacing: -0.03em;
    }
    .comparison-table td, .comparison-table th {
      background: transparent !important;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      padding: 14px 12px;
      vertical-align: middle;
    }
    .comparison-table thead th {
      font-weight: 700;
      color: white;
      border-bottom: 2px solid var(--primary) !important;
    }
    .badge-soft {
      background: rgba(129, 140, 248, 0.2);
      border-radius: 999px;
      padding: 2px 10px;
      font-weight: 600;
    }
    /* 卡片瀑布流 */
    .masonry-grid {
      column-count: 2;
      column-gap: 18px;
    }
    .masonry-grid .m-item {
      break-inside: avoid;
      margin-bottom: 18px;
      display: inline-block;
      width: 100%;
    }
    @media (max-width: 768px) {
      .masonry-grid {
        column-count: 1;
      }
    }
    /* 数字滚动 */
    .stat-num {
      font-family: var(--font-mono);
      font-size: 2.3rem;
      font-weight: 700;
      color: white;
    }
    /* 步骤条 */
    .step-item {
      display: flex;
      gap: 16px;
      padding: 16px 0;
      border-bottom: 1px dashed rgba(255, 255, 255, 0.1);
    }
    .step-num {
      width: 36px;
      height: 36px;
      border-radius: 14px;
      background: linear-gradient(145deg, var(--primary), var(--accent));
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      color: #1e1b4b;
      flex-shrink: 0;
    }
    /* 友链区 */
    .friend-links {
      padding: 24px 18px;
      border-radius: var(--radius-lg);
      background: rgba(255, 255, 255, 0.03);
      border: 1px solid rgba(255, 255, 255, 0.05);
    }
    .friend-links a {
      color: #a5b4fc;
      margin-right: 24px;
      text-decoration: none;
    }
    footer {
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      color: #94a3b8;
    }

/* --- 子页面追加 --- */
/* 关于页面专属微调 */
        .about-hero { padding: 5rem 0 3rem; position: relative; }
.about-hero h1 { font-size: 2.6rem; font-weight: 800; line-height: 1.2; }
.about-hero .lead { color: var(--text); opacity: .85; max-width: 720px; }
.about-card { background: var(--card-bg); border: 1px solid rgba(129,140,248,.15); border-radius: var(--radius-lg); padding: 2.2rem; height: 100%; backdrop-filter: blur(4px); }
.about-card .icon-circle { width: 52px; height: 52px; border-radius: 16px; background: linear-gradient(135deg, rgba(129,140,248,.2), rgba(192,132,252,.2)); display: flex; align-items: center; justify-content: center; font-size: 1.3rem; color: var(--primary); margin-bottom: 1.2rem; }
.about-card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: .7rem; color: var(--text); }
.about-card p { font-size: .95rem; line-height: 1.75; color: var(--text); opacity: .8; margin-bottom: 0; }
.timeline-item { position: relative; padding-left: 2rem; margin-bottom: 2rem; }
.timeline-item::before { content: ''; position: absolute; left: 6px; top: 6px; width: 12px; height: 12px; border-radius: 50%; background: linear-gradient(135deg, var(--primary), var(--accent)); box-shadow: 0 0 0 4px rgba(129,140,248,.15); }
.timeline-item::after { content: ''; position: absolute; left: 11px; top: 26px; width: 2px; height: calc(100% - 20px); background: linear-gradient(to bottom, rgba(129,140,248,.4), rgba(192,132,252,.15)); }
.timeline-item:last-child::after { display: none; }
.timeline-item .time { font-family: var(--font-mono); font-size: .8rem; color: var(--accent); letter-spacing: .5px; }
.timeline-item h4 { font-size: 1.05rem; font-weight: 700; margin: .3rem 0 .4rem; }
.timeline-item p { font-size: .9rem; opacity: .75; line-height: 1.7; }
.stat-box { background: var(--card-bg); border: 1px solid rgba(129,140,248,.15); border-radius: var(--radius-md); padding: 1.5rem 1rem; text-align: center; transition: .3s; }
.stat-box:hover { border-color: rgba(129,140,248,.4); transform: translateY(-3px); }
.stat-label { font-size: .85rem; opacity: .7; margin-top: .4rem; }
.quote-block { border-left: 3px solid var(--accent); padding: 1.2rem 1.5rem; background: rgba(192,132,252,.06); border-radius: 0 var(--radius-md) var(--radius-md) 0; margin: 2rem 0; }
.quote-block p { font-style: italic; font-size: 1.05rem; line-height: 1.8; }
.quote-block .author { font-size: .85rem; opacity: .6; margin-top: .6rem; font-style: normal; }
.about-hero h1 { font-size: 1.9rem; }
.about-card { padding: 1.5rem; }

/* --- 子页面追加 --- */
.join-hero {
            background: linear-gradient(135deg, rgba(129, 140, 248, 0.15) 0%, rgba(192, 132, 252, 0.1) 50%, transparent 100%);
            border-bottom: 1px solid rgba(129, 140, 248, 0.1);
            position: relative;
            overflow: hidden;
        }
.join-hero::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(192, 132, 252, 0.15) 0%, transparent 70%);
            border-radius: 50%;
            animation: floatDeco 8s ease-in-out infinite;
        }
0%, 100% { transform: translateY(0) rotate(0deg); }
50% { transform: translateY(-20px) rotate(5deg); }
.join-form-wrap {
            background: var(--card-bg);
            border: 1px solid rgba(129, 140, 248, 0.15);
            border-radius: var(--radius-lg);
            padding: 2rem;
            backdrop-filter: blur(10px);
            box-shadow: var(--shadow);
        }
.join-form-wrap .form-control {
            background: rgba(30, 27, 75, 0.6);
            border: 1px solid rgba(129, 140, 248, 0.2);
            color: var(--text);
            border-radius: 12px;
            padding: 0.75rem 1rem;
            transition: all 0.3s ease;
        }
.join-form-wrap .form-control:focus {
            background: rgba(30, 27, 75, 0.8);
            border-color: var(--primary);
            box-shadow: 0 0 0 0.2rem rgba(129, 140, 248, 0.15);
            color: var(--text);
        }
.join-form-wrap .form-control::placeholder {
            color: rgba(224, 231, 255, 0.4);
        }
.join-form-wrap .form-label {
            color: var(--text);
            font-weight: 500;
            font-size: 0.95rem;
            margin-bottom: 0.4rem;
        }
.join-form-wrap .input-group-text {
            background: rgba(30, 27, 75, 0.8);
            border: 1px solid rgba(129, 140, 248, 0.2);
            border-right: none;
            color: var(--primary);
        }
.join-form-wrap .input-group .form-control {
            border-left: none;
        }
.btn-register {
            background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
            border: none;
            color: #fff;
            font-weight: 600;
            padding: 0.75rem 2rem;
            border-radius: 12px;
            transition: all 0.3s ease;
            width: 100%;
        }
.btn-register:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(129, 140, 248, 0.3);
            color: #fff;
        }
.benefit-item {
            background: var(--card-bg);
            border: 1px solid rgba(129, 140, 248, 0.1);
            border-radius: var(--radius-md);
            padding: 1.5rem;
            transition: all 0.3s ease;
        }
.benefit-item:hover {
            transform: translateY(-4px);
            border-color: rgba(192, 132, 252, 0.3);
            box-shadow: var(--shadow);
        }
.benefit-item i {
            font-size: 2rem;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            margin-bottom: 1rem;
        }
.vip-plan {
            background: var(--card-bg);
            border: 1px solid rgba(129, 140, 248, 0.15);
            border-radius: var(--radius-lg);
            padding: 2rem;
            text-align: center;
            transition: all 0.3s ease;
            position: relative;
        }
.vip-plan:hover {
            transform: translateY(-6px);
            border-color: var(--primary);
            box-shadow: var(--shadow);
        }
.vip-plan.popular {
            border-color: var(--accent);
            background: linear-gradient(180deg, rgba(192, 132, 252, 0.08) 0%, var(--card-bg) 100%);
        }
.vip-plan .price {
            font-size: 2.5rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
.vip-plan .period {
            color: rgba(224, 231, 255, 0.6);
            font-size: 0.9rem;
        }
.vip-badge {
            position: absolute;
            top: -12px;
            left: 50%;
            transform: translateX(-50%);
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: #fff;
            font-size: 0.75rem;
            font-weight: 600;
            padding: 4px 16px;
            border-radius: 20px;
            white-space: nowrap;
        }
.agreement-text {
            font-size: 0.85rem;
            color: rgba(224, 231, 255, 0.5);
        }
.agreement-text a {
            color: var(--primary);
            text-decoration: none;
        }
.agreement-text a:hover {
            color: var(--accent);
        }
.faq-join {
            border: 1px solid rgba(129, 140, 248, 0.1);
            border-radius: var(--radius-md);
            padding: 1.5rem;
            background: var(--card-bg);
            margin-bottom: 1rem;
        }
.faq-join h4 {
            color: var(--primary);
            font-size: 1.05rem;
            margin-bottom: 0.75rem;
        }
.faq-join p {
            color: rgba(224, 231, 255, 0.75);
            font-size: 0.95rem;
            margin-bottom: 0;
        }

/* --- Bootstrap 组件配色适配(程序自动补,避免白底黑字) --- */
.table { color:#e0e7ff !important; border-color:rgba(255,255,255,.12) !important; --bs-table-bg:transparent !important; --bs-table-color:#e0e7ff !important; }
.accordion-item { background:rgba(255,255,255,.04) !important; color:#e0e7ff !important; border-color:rgba(255,255,255,.12) !important; }
.accordion-button { background:rgba(255,255,255,.04) !important; color:#e0e7ff !important; }
.accordion-body { background:transparent !important; color:#e0e7ff !important; }
.accordion-header { background:transparent !important; }
.accordion-button::after { filter: invert(1) grayscale(1) brightness(2); }