:root {
            --primary-gold: #b8860b;
            --dark-gold: #8b6508;
            --primary-red: #c0392b;
            --text-dark: #333;
            --bg-light: #f8f9fa;
            --glass: rgba(255, 255, 255, 0.95);
        }

        * { box-sizing: border-box; }
        body, html { margin: 0; padding: 0; font-family: 'Noto Sans SC', sans-serif; background: #fff; color: var(--text-dark); scroll-behavior: smooth; }

        /* 顶部导航 */
        .header {
            background: var(--glass);
            backdrop-filter: blur(10px);
            padding: 15px 20px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
            position: sticky;
            top: 0;
            z-index: 1000;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo-box { display: flex; align-items: center; gap: 10px; text-decoration: none; }
        .logo-img { width: 35px; height: 35px; border-radius: 8px; }
        .logo-text { font-size: 20px; font-weight: 900; color: var(--primary-red); }
        .cta-btn {
            background: linear-gradient(135deg, var(--primary-gold), var(--dark-gold));
            color: #fff;
            padding: 10px 20px;
            border: none;
            border-radius: 25px;
            font-weight: bold;
            cursor: pointer;
            transition: 0.3s;
            text-decoration: none;
            font-size: 14px;
        }
        .cta-btn:hover { transform: translateY(-2px); box-shadow: 0 5px 15px rgba(184,134,11,0.3); }

        /* Hero Banner */
        .hero-banner {
            width: 100%;
            max-width: 1200px;
            margin: 20px auto;
            border-radius: 20px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
        }
        .hero-banner img { width: 100%; display: block; }

        /* 主体布局 */
        .main-layout {
            max-width: 1200px;
            margin: 40px auto;
            display: grid;
            grid-template-columns: 280px 1fr;
            gap: 40px;
            padding: 0 20px;
        }

        /* 侧边栏导航 */
        .sidebar {
            position: sticky;
            top: 100px;
            height: fit-content;
        }
        .nav-card {
            background: var(--bg-light);
            padding: 20px;
            border-radius: 20px;
            border: 1px solid rgba(0,0,0,0.05);
        }
        .nav-card h3 { font-size: 18px; margin-bottom: 20px; color: var(--primary-gold); border-left: 4px solid var(--primary-gold); padding-left: 10px; }
        .nav-list { list-style: none; padding: 0; margin: 0; }
        .nav-item { margin-bottom: 12px; }
        .nav-link {
            text-decoration: none;
            color: #666;
            font-size: 15px;
            display: flex;
            align-items: center;
            gap: 10px;
            transition: 0.3s;
            padding: 8px 12px;
            border-radius: 10px;
        }
        .nav-link:hover, .nav-link.active { color: var(--primary-red); background: #fff; box-shadow: 0 4px 10px rgba(0,0,0,0.05); }

        /* 内容区 */
        .content-area {
            background: #fff;
        }
        .section {
            margin-bottom: 60px;
            scroll-margin-top: 100px;
        }
        .section-title {
            font-size: 28px;
            font-weight: 900;
            color: var(--text-dark);
            margin-bottom: 25px;
            display: flex;
            align-items: center;
            gap: 15px;
        }
        .section-title i { color: var(--primary-gold); font-size: 24px; }
        .card {
            background: #fff;
            border-radius: 20px;
            padding: 30px;
            border: 1px solid rgba(0,0,0,0.05);
            box-shadow: 0 10px 40px rgba(0,0,0,0.03);
            line-height: 1.8;
        }
        .card h4 { font-size: 20px; margin-top: 0; color: var(--primary-red); }
        .card p { color: #555; margin-bottom: 20px; }

        /* 步骤列表 */
        .step-list { list-style: none; padding: 0; }
        .step-item {
            display: flex;
            gap: 20px;
            margin-bottom: 30px;
            position: relative;
        }
        .step-num {
            width: 36px;
            height: 36px;
            background: var(--primary-gold);
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 900;
            flex-shrink: 0;
            box-shadow: 0 4px 10px rgba(184,134,11,0.3);
        }
        .step-content { flex-grow: 1; }
        .step-content h5 { font-size: 17px; margin: 0 0 10px; color: var(--text-dark); }
        .step-content p { font-size: 14px; color: #777; margin: 0; }
        .step-img {
            margin-top: 15px;
            border-radius: 15px;
            border: 1px solid #eee;
            max-width: 100%;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }

        /* 提示框 */
        .tip-box {
            background: rgba(184, 134, 11, 0.05);
            border-left: 4px solid var(--primary-gold);
            padding: 20px;
            border-radius: 0 15px 15px 0;
            margin: 20px 0;
        }
        .tip-box strong { color: var(--primary-gold); display: block; margin-bottom: 5px; }

        /* 邀请码悬浮窗 */
        .floating-invite {
            position: fixed;
            right: 30px;
            bottom: 30px;
            width: 180px;
            background: var(--glass);
            backdrop-filter: blur(20px);
            border: 1px solid rgba(184,134,11,0.3);
            border-radius: 20px;
            padding: 20px;
            text-align: center;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
            z-index: 999;
        }
        .invite-label { font-size: 12px; color: #888; margin-bottom: 10px; }
        .invite-code { font-size: 24px; font-weight: 900; color: var(--primary-red); letter-spacing: 2px; cursor: pointer; }
        .copy-btn {
            margin-top: 15px;
            width: 100%;
            padding: 8px;
            background: var(--primary-gold);
            color: #fff;
            border: none;
            border-radius: 10px;
            font-size: 13px;
            cursor: pointer;
            transition: 0.3s;
        }
        .copy-btn:hover { background: var(--dark-gold); }

        /* 底部 */
        footer {
            text-align: center;
            padding: 60px 20px;
            background: var(--bg-light);
            color: #999;
            font-size: 13px;
        }

        /* 响应式适配 */
        @media (max-width: 992px) {
            .main-layout { grid-template-columns: 1fr; }
            .sidebar { display: none; }
            .hero-title { font-size: 32px; }
        }
        @media (max-width: 768px) {
            .hero-banner { margin: 10px; border-radius: 10px; }
            .section-title { font-size: 22px; }
            .card { padding: 20px; }
            .floating-invite { width: calc(100% - 40px); left: 20px; right: 20px; bottom: 20px; display: flex; align-items: center; justify-content: space-between; padding: 15px 25px; }
            .invite-label { margin: 0; }
            .copy-btn { width: auto; margin: 0; padding: 8px 20px; }
        }