* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; background: #f5f7fa; color: #333; }
a { text-decoration: none; color: inherit; }
.navbar { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); box-shadow: 0 2px 10px rgba(0,0,0,0.1); }
.navbar-brand { color: #fff !important; font-weight: 700; font-size: 1.4rem; }
.navbar-nav .nav-link { color: rgba(255,255,255,0.9) !important; }
.navbar-nav .nav-link:hover { color: #fff !important; }
.hero { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); color: #fff; padding: 60px 0; text-align: center; }
.hero h1 { font-size: 2.5rem; font-weight: 700; margin-bottom: 15px; }
.hero p { font-size: 1.2rem; opacity: 0.9; margin-bottom: 25px; }
.hero .btn { margin: 0 8px; padding: 12px 32px; font-size: 1.05rem; border-radius: 30px; }
.section { padding: 50px 0; }
.section-title { font-size: 1.6rem; font-weight: 700; margin-bottom: 25px; text-align: center; }
.section-title span { border-bottom: 3px solid #667eea; padding-bottom: 6px; }
.card { border: none; border-radius: 12px; box-shadow: 0 4px 15px rgba(0,0,0,0.08); transition: transform 0.2s, box-shadow 0.2s; overflow: hidden; margin-bottom: 20px; }
.card:hover { transform: translateY(-4px); box-shadow: 0 8px 25px rgba(0,0,0,0.12); }
.card-img-top { height: 160px; object-fit: cover; background: linear-gradient(135deg, #667eea, #764ba2); display: flex; align-items: center; justify-content: center; color: #fff; font-size: 2rem; }
.card-body { padding: 15px; }
.card-title { font-size: 1rem; font-weight: 600; margin-bottom: 8px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; height: 2.6em; }
.card-text { color: #888; font-size: 0.85rem; }
.badge-member { background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%); }
.footer { background: #2c3e50; color: #bdc3c7; padding: 40px 0 20px; margin-top: 50px; }
.footer a { color: #bdc3c7; }
.footer a:hover { color: #fff; }
.member-card { text-align: center; padding: 30px 20px; border-radius: 16px; background: #fff; border: 2px solid #eee; transition: all 0.3s; position: relative; }
.member-card.featured { border-color: #667eea; transform: scale(1.05); box-shadow: 0 10px 30px rgba(102,126,234,0.2); }
.member-card .price { font-size: 2.5rem; font-weight: 700; color: #667eea; margin: 15px 0; }
.member-card .price small { font-size: 1rem; color: #999; }
.member-card ul { list-style: none; text-align: left; padding: 0 20px; }
.member-card ul li { padding: 8px 0; border-bottom: 1px solid #f0f0f0; }
.member-card ul li:before { content: "✓"; color: #667eea; font-weight: 700; margin-right: 8px; }
.btn-primary { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); border: none; border-radius: 8px; padding: 10px 24px; }
.btn-primary:hover { opacity: 0.9; }
.btn-outline-primary { border-color: #667eea; color: #667eea; border-radius: 8px; }
.btn-outline-primary:hover { background: #667eea; border-color: #667eea; }
.detail-cover { height: 300px; background: linear-gradient(135deg, #667eea, #764ba2); border-radius: 12px; display: flex; align-items: center; justify-content: center; color: #fff; font-size: 3rem; margin-bottom: 20px; }
.pan-box { background: #f8f9fa; border-radius: 10px; padding: 20px; margin: 15px 0; }
.pan-box .url { font-size: 1.1rem; font-weight: 600; color: #667eea; word-break: break-all; }
.sidebar { background: #fff; border-radius: 12px; padding: 20px; box-shadow: 0 2px 10px rgba(0,0,0,0.06); }
.sidebar .nav-link { color: #555; padding: 10px 15px; border-radius: 8px; margin-bottom: 3px; }
.sidebar .nav-link:hover { background: #f0f0ff; color: #667eea; }
.sidebar .nav-link.active { background: #667eea; color: #fff !important; }

/* FAQ折叠面板 */
.faq-item { border: 1px solid #e0e0e0; border-radius: 8px; margin-bottom: 10px; overflow: hidden; }
.faq-header { padding: 15px 20px; background: #f8f9fa; cursor: pointer; display: flex; justify-content: space-between; align-items: center; font-weight: 500; }
.faq-header:hover { background: #eef0ff; }
.faq-arrow { transition: transform 0.3s; color: #667eea; font-size: 0.8rem; }
.faq-item.open .faq-arrow { transform: rotate(180deg); }
.faq-content { padding: 0 20px; max-height: 0; overflow: hidden; transition: max-height 0.3s ease, padding 0.3s ease; color: #555; line-height: 1.6; }
.faq-item.open .faq-content { padding: 15px 20px; max-height: 300px; }
.user-center .nav-link { color: #555; padding: 12px 15px; border-radius: 8px; margin-bottom: 5px; }
.user-center .nav-link.active { background: #667eea; color: #fff; }
.admin-sidebar { background: #2c3e50; min-height: 100vh; padding: 0; }
.admin-sidebar .nav-link { color: #bdc3c7; padding: 14px 20px; border-left: 3px solid transparent; }
.admin-sidebar .nav-link:hover, .admin-sidebar .nav-link.active { background: rgba(255,255,255,0.1); color: #fff; border-left-color: #667eea; }
.admin-content { padding: 25px; }
.stat-card { background: #fff; border-radius: 12px; padding: 20px; box-shadow: 0 2px 10px rgba(0,0,0,0.06); }
.stat-card .number { font-size: 2rem; font-weight: 700; color: #667eea; }
.stat-card .label { color: #888; font-size: 0.9rem; margin-top: 5px; }
.table { background: #fff; border-radius: 10px; overflow: hidden; }
.page-link { color: #667eea; }
.page-item.active .page-link { background: #667eea; border-color: #667eea; }
.login-box { max-width: 420px; margin: 60px auto; background: #fff; padding: 40px; border-radius: 16px; box-shadow: 0 10px 40px rgba(0,0,0,0.1); }
.login-box h3 { text-align: center; margin-bottom: 30px; font-weight: 700; }
.form-control { border-radius: 8px; padding: 12px 15px; }
.engineer-hero { background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%); color: #fff; padding: 60px 0; text-align: center; }
.wechat-qr { width: 200px; height: 200px; background: #fff; border-radius: 12px; display: flex; align-items: center; justify-content: center; margin: 20px auto; color: #333; font-size: 0.9rem; text-align: center; padding: 10px; }