/* ==========================================
 * 云能云官网 - 自定义样式
 * Bootstrap 4 + Material Design Icons
 * ========================================== */

:root {
    --primary: #007bff;
    --primary-dark: #0069d9;
    --secondary-green: #1c7068;
    --dark-bg: #2c3e50;
    --light-bg: #F4F5FA;
    --text-main: #4d5259;
    --text-light: #6c757d;
    --success: #28a745;
    --danger: #dc3545;
    --warning: #ffc107;
}

/* ---------- 全局 ---------- */
html {
    scroll-behavior: smooth;
}
body {
    font-family: "Microsoft YaHei", system-ui, -apple-system, sans-serif;
    color: var(--text-main);
    line-height: 1.72;
    font-size: 14px;
    background-color: #fff;
    padding-top: 0;
}

/* ---------- 导航栏 ---------- */
.site-navbar {
    background: rgba(255,255,255,0.97) !important;
    box-shadow: 0 1px 10px rgba(0,0,0,0.08);
    padding: 0.5rem 0;
    transition: all 0.3s ease;
}
.site-navbar.scrolled {
    box-shadow: 0 2px 20px rgba(0,0,0,0.12);
}
.site-navbar .brand-text {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary);
    letter-spacing: 1px;
}
.site-navbar .nav-link {
    font-size: 0.95rem;
    padding: 0.5rem 1rem !important;
    color: var(--text-main) !important;
    font-weight: 500;
    transition: color 0.2s;
    position: relative;
}
.site-navbar .nav-link:hover,
.site-navbar .nav-link.active {
    color: var(--primary) !important;
}
.site-navbar .nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 1rem;
    right: 1rem;
    height: 2px;
    background: var(--primary);
    border-radius: 1px;
}
.site-auth-btns .btn {
    border-radius: 20px;
    padding: 0.35rem 1.2rem;
    font-size: 0.9rem;
}
.site-header-placeholder {
    height: 64px;
}

/* ---------- Hero 区域 ---------- */
.hero-section {
    background: linear-gradient(135deg, #007bff 0%, #0056b3 50%, #1c7068 100%);
    min-height: 85vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding: 80px 0;
}
.hero-section::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.05) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: heroBgMove 20s linear infinite;
}
@keyframes heroBgMove {
    0% { transform: translate(0, 0); }
    100% { transform: translate(50px, 50px); }
}
.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
}
.hero-title {
    font-size: 2.8rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 1rem;
    text-shadow: 0 2px 10px rgba(0,0,0,0.15);
}
.hero-subtitle {
    font-size: 1.15rem;
    color: rgba(255,255,255,0.85);
    max-width: 650px;
    margin: 0 auto 2rem;
    line-height: 1.8;
}
.hero-btns .btn {
    padding: 0.7rem 2rem;
    border-radius: 30px;
    font-size: 1rem;
    font-weight: 500;
    margin: 0 0.5rem 0.5rem;
    transition: all 0.3s ease;
}
.hero-btns .btn-primary {
    background: #fff;
    color: var(--primary);
    border: 2px solid #fff;
}
.hero-btns .btn-primary:hover {
    background: transparent;
    color: #fff;
}
.hero-btns .btn-outline-light:hover {
    background: rgba(255,255,255,0.15);
}
.hero-stats {
    margin-top: 3.5rem;
}
.hero-stat-item {
    display: inline-block;
    padding: 0 2rem;
    border-right: 1px solid rgba(255,255,255,0.25);
    color: rgba(255,255,255,0.9);
}
.hero-stat-item:last-child { border-right: none; }
.hero-stat-number {
    font-size: 1.8rem;
    font-weight: 700;
    display: block;
}
.hero-stat-label {
    font-size: 0.85rem;
    opacity: 0.8;
}
.hero-scroll-down {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    color: rgba(255,255,255,0.7);
    font-size: 1.5rem;
    animation: bounceDown 2s infinite;
    cursor: pointer;
}
@keyframes bounceDown {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

/* ---------- 产品卡片 ---------- */
.section-header {
    text-align: center;
    margin-bottom: 3rem;
}
.section-title {
    font-size: 2rem;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 0.75rem;
}
.section-subtitle {
    font-size: 1rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}
.product-card {
    border: 1px solid #e8ecf1;
    border-radius: 12px;
    background: #fff;
    padding: 2rem 1.5rem;
    text-align: center;
    transition: all 0.3s ease;
    height: 100%;
    position: relative;
    overflow: hidden;
}
.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px rgba(0,123,255,0.12);
    border-color: var(--primary);
}
.product-card.featured {
    border-color: var(--primary);
    box-shadow: 0 8px 30px rgba(0,123,255,0.15);
}
.product-card.featured .featured-badge {
    position: absolute;
    top: 12px;
    right: -30px;
    background: var(--primary);
    color: #fff;
    padding: 3px 35px;
    font-size: 0.75rem;
    font-weight: 600;
    transform: rotate(45deg);
}
.product-icon {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 1rem;
    display: inline-block;
}
.product-name {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}
.product-desc {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 1rem;
    min-height: 40px;
}
.product-price {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.25rem;
}
.product-price .currency {
    font-size: 1rem;
    font-weight: 400;
}
.product-price .period {
    font-size: 0.85rem;
    color: var(--text-light);
    font-weight: 400;
}
.product-features {
    list-style: none;
    padding: 0;
    margin: 1.25rem 0;
    text-align: left;
}
.product-features li {
    padding: 0.4rem 0;
    font-size: 0.9rem;
    color: var(--text-main);
}
.product-features li::before {
    content: '\F012C';
    font-family: 'Material Design Icons';
    color: var(--success);
    margin-right: 0.5rem;
    font-size: 0.85rem;
}
.product-card .btn {
    border-radius: 20px;
    padding: 0.45rem 1.5rem;
    width: 100%;
}

/* ---------- 服务优势 ---------- */
.features-section {
    background: var(--light-bg);
}
.feature-card {
    background: #fff;
    border-radius: 12px;
    padding: 2rem 1.5rem;
    text-align: center;
    transition: all 0.3s ease;
    height: 100%;
    border: 1px solid transparent;
}
.feature-card:hover {
    border-color: #e8ecf1;
    box-shadow: 0 8px 25px rgba(0,0,0,0.06);
    transform: translateY(-3px);
}
.feature-icon {
    width: 64px;
    height: 64px;
    line-height: 64px;
    border-radius: 16px;
    font-size: 1.6rem;
    color: #fff;
    margin: 0 auto 1.2rem;
}
.feature-icon.blue { background: linear-gradient(135deg, #007bff, #00b4d8); }
.feature-icon.green { background: linear-gradient(135deg, #1c7068, #28a745); }
.feature-icon.orange { background: linear-gradient(135deg, #ff6b35, #ffc107); }
.feature-icon.purple { background: linear-gradient(135deg, #6f42c1, #e83e8c); }
.feature-icon.cyan { background: linear-gradient(135deg, #00bcd4, #009688); }
.feature-icon.red { background: linear-gradient(135deg, #dc3545, #e83e8c); }
.feature-icon.teal { background: linear-gradient(135deg, #20c997, #17a2b8); }
.feature-icon.indigo { background: linear-gradient(135deg, #6610f2, #6f42c1); }
.feature-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}
.feature-desc {
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ---------- CTA区域 ---------- */
.cta-section {
    background: linear-gradient(135deg, #0056b3, #1c7068);
    padding: 4rem 0;
    text-align: center;
    color: #fff;
}
.cta-title {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}
.cta-desc {
    font-size: 1rem;
    opacity: 0.85;
    margin-bottom: 1.5rem;
}
.cta-section .btn {
    border-radius: 30px;
    padding: 0.7rem 2.5rem;
    font-size: 1rem;
    font-weight: 500;
    background: #fff;
    color: var(--primary);
    border: 2px solid #fff;
}
.cta-section .btn:hover {
    background: transparent;
    color: #fff;
}

/* ---------- 页脚 ---------- */
.site-footer {
    background: var(--dark-bg);
    color: rgba(255,255,255,0.7);
    padding-top: 3rem;
}
.footer-brand {
    font-size: 1.2rem;
    font-weight: 600;
    color: #fff;
}
.footer-desc {
    font-size: 0.88rem;
    line-height: 1.7;
}
.footer-title {
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1.2rem;
    position: relative;
    padding-bottom: 0.6rem;
}
.footer-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 30px;
    height: 2px;
    background: var(--primary);
}
.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}
.footer-links li {
    margin-bottom: 0.5rem;
    font-size: 0.88rem;
}
.footer-links a {
    color: rgba(255,255,255,0.65);
    text-decoration: none;
    transition: color 0.2s;
}
.footer-links a:hover {
    color: #fff;
}
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.08);
    padding: 0;
    margin-top: 2rem;
    background: rgba(0,0,0,0.2);
}
.footer-bottom-inner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    padding: 1.2rem 0;
    font-size: 0.85rem;
    gap: 0.75rem;
}
.footer-copyright {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.35rem;
    color: rgba(255,255,255,0.55);
}
.copyright-icon {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.35);
}
.copyright-divider {
    color: rgba(255,255,255,0.2);
    margin: 0 0.25rem;
}
.footer-bottom-links {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.25rem;
}
.footer-icp-link {
    color: rgba(255,255,255,0.45);
    text-decoration: none;
    font-size: 0.83rem;
    transition: color 0.25s;
}
.footer-icp-link:hover {
    color: rgba(255,255,255,0.8);
    text-decoration: none;
}
@media (max-width: 767.98px) {
    .footer-bottom-inner {
        flex-direction: column;
        text-align: center;
        gap: 0.5rem;
    }
    .footer-copyright {
        justify-content: center;
    }
    .footer-bottom-links {
        justify-content: center;
    }
}

/* ---------- 登录/注册页 ---------- */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #F4F5FA 0%, #e8ecf1 100%);
    padding: 80px 0;
}
.auth-card {
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 5px 30px rgba(0,0,0,0.08);
    padding: 2.5rem;
    max-width: 420px;
    margin: 0 auto;
    width: 100%;
}
.auth-card .auth-logo {
    text-align: center;
    margin-bottom: 1.5rem;
}
.auth-card .auth-logo img {
    height: 48px;
}
.auth-card .auth-logo span {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--primary);
    margin-left: 0.5rem;
}
.auth-card .auth-title {
    text-align: center;
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--text-main);
}
.auth-card .form-control {
    border-radius: 8px;
    padding: 0.6rem 1rem;
    height: auto;
    font-size: 0.95rem;
    border-color: #dce0e6;
}
.auth-card .form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 0.2rem rgba(0,123,255,0.1);
}
.auth-card .input-group-text {
    border-radius: 8px;
    background: var(--light-bg);
    border-color: #dce0e6;
    color: var(--text-light);
}
.auth-card .btn-primary {
    border-radius: 8px;
    padding: 0.6rem;
    font-weight: 500;
}
.auth-card .auth-link {
    text-align: center;
    margin-top: 1rem;
    font-size: 0.9rem;
    color: var(--text-light);
}
.auth-card .auth-link a {
    color: var(--primary);
}

/* ---------- 产品详情页 ---------- */
.product-detail-section {
    padding: 60px 0;
}
.product-detail-header {
    margin-bottom: 2rem;
}
.product-detail-header .product-icon-lg {
    font-size: 4rem;
    color: var(--primary);
}
.product-detail-header h1 {
    font-size: 2rem;
    font-weight: 600;
}
.product-detail-header .price-lg {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
}
.spec-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0 8px;
}
.spec-table tr td {
    padding: 0.75rem 1rem;
    background: var(--light-bg);
    border-radius: 8px;
}
.spec-table tr td:first-child {
    font-weight: 600;
    width: 40%;
    color: var(--text-main);
}
.spec-table tr td:last-child {
    color: var(--text-light);
}
.product-detail-content {
    line-height: 1.8;
    color: var(--text-light);
}

/* ---------- 用户中心 ---------- */
.ucenter-page {
    padding-top: 80px;
    min-height: 100vh;
    background: var(--light-bg);
}
.ucenter-sidebar {
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.04);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}
.ucenter-sidebar .user-avatar {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), #00b4d8);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1.5rem;
    font-weight: 600;
}
.ucenter-sidebar .menu-item {
    display: block;
    padding: 0.6rem 1rem;
    border-radius: 8px;
    color: var(--text-main);
    text-decoration: none;
    transition: all 0.2s;
    margin-bottom: 0.25rem;
}
.ucenter-sidebar .menu-item:hover,
.ucenter-sidebar .menu-item.active {
    background: var(--primary);
    color: #fff;
    text-decoration: none;
}
.ucenter-content {
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.04);
    padding: 1.5rem;
}
.host-card {
    border: 1px solid #e8ecf1;
    border-radius: 10px;
    padding: 1.25rem;
    margin-bottom: 1rem;
    transition: all 0.2s;
}
.host-card:hover {
    border-color: var(--primary);
    box-shadow: 0 4px 15px rgba(0,123,255,0.08);
}
.host-status {
    display: inline-block;
    padding: 0.2rem 0.75rem;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 500;
}
.host-status.active { background: #d4edda; color: #155724; }
.host-status.expired { background: #f8d7da; color: #721c24; }
.host-status.paused { background: #fff3cd; color: #856404; }
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-light);
}
.empty-state i {
    font-size: 3rem;
    display: block;
    margin-bottom: 1rem;
    color: #dce0e6;
}

/* ---------- 动画 ---------- */
.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}
.fade-in-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ---------- 购买弹窗 ---------- */
.purchase-modal { border-radius:12px; overflow:hidden; }
.purchase-product-summary { border-left:3px solid var(--primary); }
.purchase-product-summary .purchase-icon { font-size:2.2rem; color:var(--primary); }
.purchase-params { background:#fff; border-radius:8px; }

/* 周期选择器 */
.period-options { 
    display:flex !important; gap:10px; flex-wrap:wrap;
}
.period-option {
    flex:1 !important; min-width:90px;
    text-align:center !important; 
    padding:14px 10px !important; 
    border:2px solid #d0d7e2 !important;
    border-radius:12px !important; 
    cursor:pointer !important; 
    transition:all 0.25s ease !important; 
    position:relative !important;
    background:#fff !important;
    overflow:visible !important;
}
.period-option:hover { 
    border-color:#007bff !important; 
    background:#f0f7ff !important; 
    transform:translateY(-2px);
    box-shadow:0 4px 12px rgba(0,123,255,0.12);
}
.period-option.active { 
    border-color:#007bff !important; 
    background:linear-gradient(135deg,#e6f2ff,#cce5ff) !important; 
    box-shadow:0 0 0 3px rgba(0,123,255,0.15);
}
.period-option.disabled { 
    opacity:0.35 !important; cursor:not-allowed !important; 
    background:#f8f9fa !important; border-style:dashed !important;
}
.period-option.disabled:hover { 
    transform:none !important; box-shadow:none !important;
    border-color:#d0d7e2 !important; background:#f8f9fa !important;
}
.period-option .period-name { 
    display:block !important;
    font-weight:700 !important; font-size:0.95rem !important; 
    margin-bottom:6px !important; color:#333 !important;
    letter-spacing:1px;
}
.period-option.active .period-name { color:#0056b3 !important; }
.period-option .period-price { 
    display:block !important;
    font-size:1.35rem !important; font-weight:800 !important; 
    color:#007bff !important; line-height:1.3;
}
.period-option.active .period-price { color:#0056b3 !important; }
.period-option .period-unit { 
    display:block !important;
    font-size:0.72rem !important; color:#888 !important; 
    margin-top:4px !important;
}
.period-option .period-tag {
    position:absolute !important; top:-10px !important; right:-8px !important; 
    background:#ff6b35 !important; color:#fff !important;
    font-size:0.65rem !important; padding:2px 10px !important; 
    border-radius:12px !important; font-weight:700 !important;
    z-index:2;
    box-shadow:0 2px 6px rgba(255,107,53,0.3);
}
.period-option.active .period-tag { background:#007bff !important; }

.purchase-total { box-shadow:0 3px 12px rgba(0,123,255,0.25); }

/* ---------- 产品中心页 ---------- */
.products-page {
    padding: 80px 0 40px;
    background: var(--light-bg);
    min-height: 100vh;
}
.products-page .section-header {
    margin-bottom: 2rem;
}
.product-grid-card {
    background: #fff;
    border-radius: 12px;
    border: 1px solid #e8ecf1;
    padding: 2rem 1.5rem;
    text-align: center;
    height: 100%;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}
.product-grid-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px rgba(0,123,255,0.12);
    border-color: var(--primary);
}
.product-grid-card .pg-icon {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: 1rem;
}
.product-grid-card .pg-name {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}
.product-grid-card .pg-desc {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 1.25rem;
    min-height: 40px;
}
.product-grid-card .pg-price {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.2rem;
}
.product-grid-card .pg-price .currency {
    font-size: 1rem;
    font-weight: 400;
}
.product-grid-card .pg-price .period {
    font-size: 0.8rem;
    color: var(--text-light);
    font-weight: 400;
}
.product-grid-card .pg-specs {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.25rem 1rem;
    margin: 1rem 0 1.25rem;
    font-size: 0.82rem;
    color: var(--text-light);
}
.product-grid-card .pg-specs span {
    white-space: nowrap;
}
.product-grid-card .pg-specs i {
    color: var(--success);
    margin-right: 0.2rem;
}
.product-grid-card .btn {
    border-radius: 20px;
    padding: 0.5rem 1.8rem;
}
.product-grid-card .pg-badge {
    position: absolute;
    top: 14px;
    right: -28px;
    background: linear-gradient(135deg, #ff6b35, #ff8c42);
    color: #fff;
    padding: 3px 30px;
    font-size: 0.72rem;
    font-weight: 700;
    transform: rotate(45deg);
    box-shadow: 0 2px 8px rgba(255,107,53,0.3);
}
.empty-products {
    text-align: center;
    padding: 4rem 0;
    color: var(--text-light);
}
.empty-products i {
    font-size: 4rem;
    display: block;
    margin-bottom: 1rem;
    color: #dce0e6;
}

/* ---------- 帮助/FAQ/隐私 通用内容页 ---------- */
.content-page {
    padding: 80px 0 40px;
    min-height: 100vh;
    background: #fff;
}
.content-page .page-header {
    text-align: center;
    margin-bottom: 3rem;
}
.content-page .page-header .page-icon {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: 0.75rem;
}
.content-page .page-header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 0.5rem;
}
.content-page .page-header .page-desc {
    font-size: 1rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}
.content-card {
    background: #fff;
    border: 1px solid #e8ecf1;
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 1.5rem;
    transition: all 0.25s;
}
.content-card:hover {
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    border-color: #d0d7e2;
}
.content-card h3 {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid #f0f0f0;
}
.content-card h3 i {
    color: var(--primary);
    margin-right: 0.5rem;
}
.content-card p, .content-card li {
    color: var(--text-light);
    line-height: 1.85;
    font-size: 0.95rem;
}
.content-card ul {
    padding-left: 1.2rem;
}
.content-card ul li {
    margin-bottom: 0.4rem;
}

/* FAQ 折叠面板 */
.faq-accordion .card {
    border: 1px solid #e8ecf1;
    border-radius: 10px !important;
    margin-bottom: 0.75rem;
    overflow: hidden;
}
.faq-accordion .card-header {
    background: #fff;
    border-bottom: none;
    padding: 0;
}
.faq-accordion .btn-link {
    display: flex;
    align-items: center;
    width: 100%;
    text-align: left;
    padding: 1rem 1.25rem;
    color: var(--text-main);
    font-weight: 600;
    font-size: 0.95rem;
    text-decoration: none;
    transition: all 0.2s;
}
.faq-accordion .btn-link:hover {
    color: var(--primary);
    background: #f8f9fc;
}
.faq-accordion .btn-link .faq-q {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    font-size: 0.8rem;
    font-weight: 700;
    margin-right: 0.75rem;
    flex-shrink: 0;
}
.faq-accordion .btn-link .mdi-chevron-down {
    margin-left: auto;
    transition: transform 0.3s;
    color: var(--text-light);
}
.faq-accordion .btn-link[aria-expanded="true"] .mdi-chevron-down {
    transform: rotate(180deg);
}
.faq-accordion .card-body {
    padding: 1rem 1.25rem 1.25rem 3.75rem;
    color: var(--text-light);
    line-height: 1.8;
    font-size: 0.93rem;
    background: #f8f9fc;
}

/* 侧边目录导航 */
.content-sidebar {
    position: sticky;
    top: 85px;
}
.content-sidebar .sidebar-nav {
    list-style: none;
    padding: 0;
    margin: 0;
    background: #fff;
    border: 1px solid #e8ecf1;
    border-radius: 10px;
    overflow: hidden;
}
.content-sidebar .sidebar-nav li a {
    display: block;
    padding: 0.7rem 1.2rem;
    color: var(--text-main);
    font-size: 0.9rem;
    text-decoration: none;
    border-left: 3px solid transparent;
    transition: all 0.2s;
}
.content-sidebar .sidebar-nav li a:hover,
.content-sidebar .sidebar-nav li a.active {
    color: var(--primary);
    background: #f0f7ff;
    border-left-color: var(--primary);
}
.content-sidebar .sidebar-nav li + li {
    border-top: 1px solid #f0f0f0;
}

/* ---------- 响应式 ---------- */

/* LG 以下 (平板/手机): <992px */
@media (max-width: 991.98px) {
    .hero-title { font-size: 2rem; }
    .hero-subtitle { font-size: 1rem; }
    .hero-stats { display: none; }
    .site-navbar .navbar-nav.mx-auto { margin: 0 !important; }
    /* 导航栏移动端 - 增加水平间距 */
    .site-navbar { padding: 0.4rem 0.6rem; }
    .site-navbar .brand-text { font-size: 1.1rem; }
    .site-navbar .navbar-brand img { height: 30px; }
    /* 导航折叠后菜单项间距 */
    .site-navbar .navbar-collapse { padding-top: 0.5rem; }
    .site-navbar .nav-link { padding: 0.6rem 0.75rem !important; }
    .site-navbar .nav-link.active::after { left: 0.75rem; right: 0.75rem; }
    .site-auth-btns { padding: 0.5rem 0.75rem; }
    .site-auth-btns .btn { margin-bottom: 0.4rem; }
    /* 产品网格卡片移动端按钮 */
    .product-grid-card .btn { display: block; width: 100%; margin: 0.35rem 0 !important; }
    /* 内容页移动端 */
    .content-card { padding: 1.25rem; }
    .content-page .page-header h1 { font-size: 1.55rem; }
    /* FAQ 折叠面板 */
    .faq-accordion .btn-link { padding: 0.85rem 1rem; font-size: 0.9rem; }
    .faq-accordion .card-body { padding: 0.75rem 1rem 1rem 3.25rem; font-size: 0.88rem; }
    .faq-accordion .btn-link .faq-q { width: 24px; height: 24px; font-size: 0.75rem; margin-right: 0.5rem; }
    /* 侧边栏移动端改为顶部横排 */
    .content-sidebar { position: static; margin-bottom: 1.5rem; }
    .content-sidebar .sidebar-nav { display: flex; flex-wrap: wrap; border-radius: 8px; }
    .content-sidebar .sidebar-nav li { flex: 0 0 auto; }
    .content-sidebar .sidebar-nav li + li { border-top: none; border-left: 1px solid #f0f0f0; }
    .content-sidebar .sidebar-nav li a { padding: 0.5rem 0.9rem; font-size: 0.82rem; border-left: none; border-bottom: 2px solid transparent; }
    .content-sidebar .sidebar-nav li a:hover,
    .content-sidebar .sidebar-nav li a.active { border-left: none; border-bottom-color: var(--primary); background: #f0f7ff; }
    /* 产品详情页 */
    .product-detail-header h1 { font-size: 1.5rem; }
    .product-detail-header .price-lg { font-size: 1.8rem; }
    /* 用户中心 */
    .ucenter-sidebar { margin-bottom: 1rem; }
}

/* MD 以下 (手机): <768px */
@media (max-width: 767.98px) {
    .hero-title { font-size: 1.5rem; }
    .hero-section { min-height: 55vh; padding: 50px 0; }
    .hero-subtitle { font-size: 0.9rem; padding: 0 0.5rem; }
    .hero-btns .btn { display: block; width: 80%; margin: 0.5rem auto; }
    .hero-scroll-down { bottom: 15px; font-size: 1.2rem; }
    .section-title { font-size: 1.4rem; }
    .section-subtitle { font-size: 0.9rem; padding: 0 0.5rem; }
    .product-price { font-size: 1.5rem; }
    .auth-card { max-width: 100%; margin: 0 1rem; padding: 1.5rem; }
    .site-header-placeholder { height: 54px; }
    /* 产品卡片移动端优化 */
    .product-card { padding: 1.5rem 1rem; }
    .product-grid-card { padding: 1.5rem 1rem; }
    .product-grid-card .pg-name { font-size: 1.15rem; }
    .product-grid-card .pg-price { font-size: 1.6rem; }
    .product-grid-card .pg-specs { gap: 0.2rem 0.75rem; font-size: 0.78rem; }
    .product-grid-card .pg-icon { font-size: 2.4rem; }
    /* 服务优势移动端 */
    .feature-card { padding: 1.5rem 1rem; }
    .feature-icon { width: 52px; height: 52px; line-height: 52px; font-size: 1.35rem; border-radius: 12px; margin-bottom: 0.8rem; }
    .feature-title { font-size: 1rem; }
    .feature-desc { font-size: 0.83rem; }
    /* CTA 移动端 */
    .cta-section { padding: 2.5rem 0; }
    .cta-title { font-size: 1.4rem; }
    .cta-desc { font-size: 0.9rem; padding: 0 0.5rem; }
    .cta-section .btn { padding: 0.55rem 1.8rem; font-size: 0.9rem; }
    /* 内容页移动端 */
    .content-page { padding: 60px 0 30px; }
    .content-page .page-header { margin-bottom: 1.5rem; }
    .content-page .page-header .page-icon { font-size: 2.2rem; }
    .content-page .page-header h1 { font-size: 1.35rem; }
    .content-card h3 { font-size: 1.05rem; }
    .content-card p, .content-card li { font-size: 0.9rem; }
    /* 产品中心页 */
    .products-page { padding: 60px 0 30px; }
    /* 页脚移动端 */
    .site-footer { padding-top: 2rem; }
    .footer-desc { font-size: 0.82rem; }
    .footer-links li { font-size: 0.82rem; }
    .footer-brand { font-size: 1.05rem; }
    .footer-bottom-inner { font-size: 0.78rem; }
    .footer-icp-link { font-size: 0.78rem; }
    /* 购买弹窗周期选择器 */
    .period-option { min-width: 70px; padding: 10px 6px !important; }
    .period-option .period-name { font-size: 0.82rem !important; }
    .period-option .period-price { font-size: 1.1rem !important; }
}

/* 特小屏 (小手机): <480px */
@media (max-width: 479.98px) {
    .hero-title { font-size: 1.3rem; }
    .hero-section { min-height: 50vh; padding: 40px 0; }
    .hero-subtitle { font-size: 0.82rem; }
    .hero-btns .btn { width: 90%; font-size: 0.9rem; padding: 0.55rem 1.5rem; }
    .section-title { font-size: 1.25rem; }
    .site-navbar .brand-text { font-size: 1rem; }
    .site-navbar .navbar-brand img { height: 26px; }
    .product-grid-card { padding: 1.2rem 0.75rem; }
    .product-grid-card .pg-name { font-size: 1.05rem; }
    .product-grid-card .pg-price { font-size: 1.4rem; }
    .product-grid-card .pg-desc { font-size: 0.82rem; }
    .product-grid-card .pg-specs > span { width: 100%; text-align: center; }
    .content-sidebar .sidebar-nav li a { padding: 0.4rem 0.6rem; font-size: 0.75rem; }
    .faq-accordion .btn-link { font-size: 0.85rem; }
    .faq-accordion .card-body { padding-left: 1rem; font-size: 0.83rem; }
    .faq-accordion .btn-link .faq-q { width: 22px; height: 22px; font-size: 0.7rem; }
    /* 页脚底部版权折行优化 */
    .copyright-divider { display: none; }
    .footer-bottom-links { gap: 0.4rem; }
    .footer-bottom-links .copyright-divider { display: inline; }
    /* 购买弹窗周期选择器 */
    .period-options { gap: 6px; }
    .period-option { min-width: 60px; padding: 8px 4px !important; }
    .period-option .period-price { font-size: 1rem !important; }
}