/* ===========================
   教辅学习库 - 官网样式
   现代简约蓝白风格
   =========================== */

/* ===== 基础重置 ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --primary-lighter: #dbeafe;
    --primary-lightest: #eff6ff;
    --accent: #f59e0b;
    --accent-dark: #d97706;
    --success: #10b981;
    --danger: #ef4444;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-light: #94a3b8;
    --bg-white: #ffffff;
    --bg-light: #f8fafc;
    --bg-lighter: #f1f5f9;
    --border: #e2e8f0;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
    --shadow-md: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.05);
    --shadow-lg: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.05);
    --shadow-xl: 0 25px 50px -12px rgba(0,0,0,0.15);
    --radius-sm: 6px;
    --radius: 10px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1200px;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    color: var(--text-primary);
    background: var(--bg-white);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

ul, ol {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

/* ===== 容器 ===== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.navbar-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--primary);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.3rem;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.logo-icon-img {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    object-fit: contain;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
    background: white;
}

.logo-text {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
    position: relative;
    padding: 4px 0;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary);
}

.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary);
    border-radius: 2px;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* ===== 按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 22px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 14px rgba(37, 99, 235, 0.25);
}

.btn-primary:hover {
    background: var(--primary-dark);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.35);
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 1.5px solid var(--primary);
}

.btn-outline:hover {
    background: var(--primary);
    color: white;
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    padding: 8px 16px;
}

.btn-ghost:hover {
    color: var(--primary);
    background: var(--primary-lightest);
}

.btn-lg {
    padding: 14px 32px;
    font-size: 1.05rem;
}

.btn-sm {
    padding: 6px 14px;
    font-size: 0.85rem;
}

.btn-block {
    width: 100%;
}

/* ===== 移动端菜单按钮 ===== */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

.menu-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ===== Hero 区域 ===== */
.hero {
    position: relative;
    padding: 140px 0 80px;
    background: linear-gradient(135deg, var(--primary-lightest) 0%, #e0f2fe 50%, var(--primary-lightest) 100%);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -200px;
    right: -200px;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.08) 0%, transparent 70%);
    border-radius: 50%;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -150px;
    left: -150px;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.06) 0%, transparent 70%);
    border-radius: 50%;
}

.hero-inner {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 60px;
    align-items: center;
}

.hero-content {
    animation: fadeInUp 0.8s ease;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: white;
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary);
    box-shadow: var(--shadow);
    margin-bottom: 24px;
}

.hero-badge .dot {
    width: 8px;
    height: 8px;
    background: var(--success);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.2;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.hero h1 .highlight {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid rgba(37, 99, 235, 0.1);
}

.hero-stat {
    text-align: left;
}

.hero-stat .number {
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
}

.hero-stat .label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

.hero-visual {
    position: relative;
    animation: fadeInRight 0.8s ease;
}

.hero-card {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    padding: 32px;
    transform: rotate(2deg);
    transition: var(--transition);
}

.hero-card:hover {
    transform: rotate(0deg);
}

.hero-card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border);
}

.hero-card-header .icon {
    width: 48px;
    height: 48px;
    background: var(--primary-lighter);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.hero-card-header h3 {
    font-size: 1.1rem;
    font-weight: 700;
}

.hero-card-header p {
    font-size: 0.85rem;
    color: var(--text-light);
}

.hero-card-items {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.hero-card-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: var(--bg-light);
    border-radius: var(--radius);
    transition: var(--transition);
}

.hero-card-item:hover {
    background: var(--primary-lightest);
    transform: translateX(4px);
}

.hero-card-item .item-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    flex-shrink: 0;
}

.hero-card-item .item-info {
    flex: 1;
}

.hero-card-item .item-info h4 {
    font-size: 0.9rem;
    font-weight: 600;
}

.hero-card-item .item-info p {
    font-size: 0.75rem;
    color: var(--text-light);
}

.hero-card-item .item-tag {
    font-size: 0.7rem;
    padding: 2px 8px;
    border-radius: 50px;
    font-weight: 600;
}

.tag-hot {
    background: #fef3c7;
    color: var(--accent-dark);
}

.tag-new {
    background: #d1fae5;
    color: #065f46;
}

.tag-vip {
    background: var(--primary-lighter);
    color: var(--primary-dark);
}

/* 浮动装饰 */
.float-badge {
    position: absolute;
    background: white;
    padding: 12px 16px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.85rem;
    font-weight: 600;
    z-index: 2;
}

.float-badge-1 {
    top: -20px;
    left: -30px;
    animation: float 3s ease-in-out infinite;
}

.float-badge-2 {
    bottom: -20px;
    right: -20px;
    animation: float 3s ease-in-out infinite 1.5s;
}

.float-badge .icon {
    font-size: 1.3rem;
}

/* ===== 通用 Section ===== */
.section {
    padding: 80px 0;
}

.section-light {
    background: var(--bg-light);
}

.section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 56px;
}

.section-tag {
    display: inline-block;
    background: var(--primary-lighter);
    color: var(--primary);
    font-size: 0.85rem;
    font-weight: 600;
    padding: 4px 14px;
    border-radius: 50px;
    margin-bottom: 16px;
}

.section-header h2 {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 16px;
    line-height: 1.3;
}

.section-header p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===== 特性卡片 ===== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.feature-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 32px 24px;
    transition: var(--transition);
    text-align: center;
}

.feature-card:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.feature-card .icon-wrap {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    transition: var(--transition);
}

.feature-card:hover .icon-wrap {
    transform: scale(1.1) rotate(-5deg);
}

.feature-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.feature-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.bg-blue { background: var(--primary-lightest); }
.bg-green { background: #d1fae5; }
.bg-orange { background: #fef3c7; }
.bg-purple { background: #ede9fe; }

/* ===== 学段选择 ===== */
.stages-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.stage-card {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--border);
}

.stage-card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-6px);
}

.stage-banner {
    height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    position: relative;
    overflow: hidden;
}

.stage-banner::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 50%;
    background: linear-gradient(to top, rgba(0,0,0,0.05), transparent);
}

.stage-banner-primary { background: linear-gradient(135deg, #dbeafe, #bfdbfe); }
.stage-banner-success { background: linear-gradient(135deg, #d1fae5, #a7f3d0); }
.stage-banner-accent { background: linear-gradient(135deg, #fef3c7, #fde68a); }

.stage-body {
    padding: 28px 24px;
}

.stage-body h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.stage-body > p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.stage-subjects {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.stage-subjects span {
    font-size: 0.8rem;
    padding: 4px 12px;
    background: var(--bg-lighter);
    border-radius: 50px;
    color: var(--text-secondary);
    font-weight: 500;
}

.stage-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

.stage-meta .count {
    font-size: 0.85rem;
    color: var(--text-light);
}

.stage-meta .count strong {
    color: var(--primary);
    font-size: 1.1rem;
}

.stages-grid-k9 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
    max-width: 800px;
    margin: 0 auto;
}

@media (max-width: 768px) {
    .stages-grid-k9 { grid-template-columns: 1fr; max-width: 400px; }
}

/* ===== 资源列表 ===== */
.resource-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin-bottom: 40px;
}

.filter-btn {
    padding: 8px 20px;
    border-radius: 50px;
    border: 1.5px solid var(--border);
    background: white;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.filter-btn:hover {
    border-color: var(--primary-light);
    color: var(--primary);
}

.filter-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.resources-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.resource-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition);
}

.resource-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: var(--primary-light);
}

.resource-thumb {
    height: 140px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    position: relative;
}

.resource-thumb .resource-type-badge {
    position: absolute;
    top: 12px;
    right: 12px;
    font-size: 0.7rem;
    padding: 3px 10px;
    border-radius: 50px;
    font-weight: 600;
    background: rgba(255,255,255,0.9);
}

.resource-body {
    padding: 20px;
}

.resource-body h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 8px;
    line-height: 1.4;
}

.resource-body p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.5;
}

.resource-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 14px;
    border-top: 1px solid var(--border);
}

.resource-meta .meta-info {
    display: flex;
    gap: 12px;
    font-size: 0.8rem;
    color: var(--text-light);
}

.resource-meta .meta-info span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.resource-download {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 4px;
    transition: var(--transition);
}

.resource-download:hover {
    color: var(--primary-dark);
    gap: 8px;
}

/* ===== 截图预览弹窗 ===== */
.preview-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(8px);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.preview-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.preview-modal {
    background: white;
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 800px;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    transform: translateY(20px);
    transition: transform 0.3s ease;
}

.preview-overlay.active .preview-modal {
    transform: translateY(0);
}

.preview-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 28px;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    background: white;
    z-index: 1;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.preview-modal-header h3 {
    font-size: 1.15rem;
    font-weight: 700;
}

.preview-modal-close {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: none;
    background: var(--bg-lighter);
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    color: var(--text-secondary);
}

.preview-modal-close:hover {
    background: var(--danger);
    color: white;
}

.preview-screenshot {
    padding: 28px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.preview-screenshot-page {
    background: #f8fafc;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    min-height: 300px;
    position: relative;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}

.preview-screenshot-page .page-number {
    position: absolute;
    bottom: 12px;
    right: 16px;
    font-size: 0.75rem;
    color: var(--text-light);
    font-weight: 500;
}

.preview-screenshot-page .doc-title {
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--primary-lighter);
}

.preview-screenshot-page .doc-content {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.preview-screenshot-page .doc-line {
    height: 12px;
    background: var(--bg-lighter);
    border-radius: 4px;
}

.preview-screenshot-page .doc-line:nth-child(2) { width: 92%; }
.preview-screenshot-page .doc-line:nth-child(3) { width: 88%; }
.preview-screenshot-page .doc-line:nth-child(4) { width: 95%; }
.preview-screenshot-page .doc-line:nth-child(5) { width: 85%; }
.preview-screenshot-page .doc-line:nth-child(6) { width: 90%; }
.preview-screenshot-page .doc-line:nth-child(7) { width: 78%; }

.preview-screenshot-page .doc-table {
    margin-top: 12px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.preview-screenshot-page .doc-table .cell {
    background: white;
    padding: 10px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-align: center;
}

.preview-screenshot-page .doc-table .cell.header {
    background: var(--primary-lighter);
    color: var(--primary);
    font-weight: 700;
}

.preview-modal-footer {
    padding: 16px 28px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.preview-modal-footer .preview-info {
    font-size: 0.85rem;
    color: var(--text-light);
}

.preview-modal-footer .preview-info strong {
    color: var(--primary);
}

/* ===== 数据统计 ===== */
.stats-section {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    padding: 64px 0;
    position: relative;
    overflow: hidden;
}

.stats-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.stats-grid {
    position: relative;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    text-align: center;
}

.stat-item .number {
    font-size: 2.8rem;
    font-weight: 800;
    color: white;
    line-height: 1;
    margin-bottom: 8px;
}

.stat-item .number .unit {
    font-size: 1.2rem;
    font-weight: 600;
}

.stat-item .label {
    font-size: 0.95rem;
    color: rgba(255,255,255,0.8);
}

/* ===== 会员体系 ===== */
.membership-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
    max-width: 1000px;
    margin: 0 auto;
}

.membership-card {
    background: white;
    border: 2px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    text-align: center;
    transition: var(--transition);
    position: relative;
}

.membership-card:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.membership-card.featured {
    border-color: var(--primary);
    box-shadow: var(--shadow-lg);
    transform: scale(1.03);
}

.membership-card.featured:hover {
    transform: scale(1.03) translateY(-4px);
}

.membership-card .popular-badge {
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent);
    color: white;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 4px 16px;
    border-radius: 50px;
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
}

.membership-card .plan-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 16px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
}

.membership-card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.membership-card .plan-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.membership-card .price {
    margin-bottom: 24px;
}

.membership-card .price .amount {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-primary);
}

.membership-card .price .currency {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.membership-card .price .period {
    font-size: 0.9rem;
    color: var(--text-light);
}

.membership-features {
    text-align: left;
    margin-bottom: 28px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.membership-features li {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.membership-features li .check {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--success);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    flex-shrink: 0;
}

.membership-features li.disabled {
    color: var(--text-light);
}

.membership-features li.disabled .check {
    background: var(--border);
}

/* ===== 资讯卡片 ===== */
.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.news-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.news-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.news-thumb {
    height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    position: relative;
}

.news-thumb .news-category {
    position: absolute;
    top: 12px;
    left: 12px;
    font-size: 0.75rem;
    padding: 4px 12px;
    border-radius: 50px;
    font-weight: 600;
    background: rgba(255,255,255,0.95);
    color: var(--primary);
}

.news-body {
    padding: 24px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.news-body .news-date {
    font-size: 0.8rem;
    color: var(--text-light);
    margin-bottom: 10px;
}

.news-body h4 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 10px;
    line-height: 1.4;
    color: var(--text-primary);
}

.news-body p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.6;
    flex: 1;
    margin-bottom: 16px;
}

.news-body .news-link {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary);
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: var(--transition);
}

.news-body .news-link:hover {
    gap: 8px;
}

/* ===== CTA 区域 ===== */
.cta-section {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary-lightest), #e0f2fe);
}

.cta-box {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: var(--radius-xl);
    padding: 56px 48px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-box::before {
    content: '';
    position: absolute;
    top: -100px;
    right: -100px;
    width: 300px;
    height: 300px;
    background: rgba(255,255,255,0.05);
    border-radius: 50%;
}

.cta-box::after {
    content: '';
    position: absolute;
    bottom: -80px;
    left: -80px;
    width: 250px;
    height: 250px;
    background: rgba(255,255,255,0.05);
    border-radius: 50%;
}

.cta-box h2 {
    position: relative;
    font-size: 2rem;
    font-weight: 800;
    color: white;
    margin-bottom: 14px;
}

.cta-box p {
    position: relative;
    font-size: 1.05rem;
    color: rgba(255,255,255,0.85);
    margin-bottom: 32px;
}

.cta-box .btn {
    position: relative;
    background: white;
    color: var(--primary);
}

.cta-box .btn:hover {
    background: var(--bg-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* ===== 关于我们 ===== */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-visual {
    position: relative;
}

.about-visual .about-img {
    background: linear-gradient(135deg, var(--primary-lightest), #e0f2fe);
    border-radius: var(--radius-xl);
    height: 360px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 6rem;
}

.about-visual .about-badge {
    position: absolute;
    bottom: -20px;
    right: -20px;
    background: white;
    padding: 20px 28px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    text-align: center;
}

.about-visual .about-badge .number {
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary);
}

.about-visual .about-badge .label {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.about-content h2 {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 20px;
}

.about-content > p {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 24px;
}

.about-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 32px;
}

.about-list li {
    display: flex;
    gap: 14px;
    align-items: flex-start;
}

.about-list .icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.about-list .text h4 {
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.about-list .text p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ===== 联系区域 ===== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    padding: 24px;
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.contact-item:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--primary-light);
}

.contact-item .icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    flex-shrink: 0;
}

.contact-item .info h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.contact-item .info p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.contact-form {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 32px;
}

.contact-form h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 24px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    color: var(--text-primary);
    background: var(--bg-light);
    transition: var(--transition);
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    background: white;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* ===== 页脚 ===== */
.footer {
    background: #0f172a;
    color: rgba(255,255,255,0.7);
    padding: 64px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-brand .logo {
    margin-bottom: 16px;
    color: white;
}

.footer-brand .logo .logo-text {
    background: linear-gradient(135deg, #60a5fa, #93c5fd);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-brand p {
    font-size: 0.9rem;
    line-height: 1.7;
    margin-bottom: 20px;
    max-width: 320px;
}

.footer-social {
    display: flex;
    gap: 12px;
}

.footer-social a {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    background: rgba(255,255,255,0.05);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: var(--transition);
}

.footer-social a:hover {
    background: var(--primary);
    transform: translateY(-2px);
}

.footer-col h4 {
    font-size: 1rem;
    font-weight: 700;
    color: white;
    margin-bottom: 20px;
}

.footer-col ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-col ul a {
    font-size: 0.9rem;
    color: rgba(255,255,255,0.6);
    transition: var(--transition);
}

.footer-col ul a:hover {
    color: white;
    padding-left: 4px;
}

.footer-bottom {
    padding: 24px 0;
    border-top: 1px solid rgba(255,255,255,0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: rgba(255,255,255,0.5);
}

.footer-bottom a {
    color: rgba(255,255,255,0.5);
    transition: var(--transition);
}

.footer-bottom a:hover {
    color: rgba(255,255,255,0.8);
}

/* ===== 页面 Banner ===== */
.page-banner {
    padding: 120px 0 60px;
    background: linear-gradient(135deg, var(--primary-lightest), #e0f2fe);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-banner::before {
    content: '';
    position: absolute;
    top: -100px;
    right: -100px;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.06) 0%, transparent 70%);
    border-radius: 50%;
}

.page-banner h1 {
    position: relative;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.page-banner p {
    position: relative;
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.breadcrumb {
    position: relative;
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 16px;
    font-size: 0.85rem;
    color: var(--text-light);
}

.breadcrumb a {
    color: var(--text-secondary);
    transition: var(--transition);
}

.breadcrumb a:hover {
    color: var(--primary);
}

/* ===== 动画 ===== */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInRight {
    from { opacity: 0; transform: translateX(30px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

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

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

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .stages-grid { grid-template-columns: 1fr; }
    .resources-grid { grid-template-columns: repeat(2, 1fr); }
    .news-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
    .hero h1 { font-size: 2.4rem; }
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 68px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 24px;
        gap: 16px;
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: var(--transition);
    }

    .nav-links.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

    .nav-actions .btn-ghost { display: none; }

    .menu-toggle { display: flex; }

    .hero-inner { grid-template-columns: 1fr; gap: 40px; }
    .hero { padding: 110px 0 60px; }
    .hero h1 { font-size: 2rem; }
    .hero p { font-size: 1rem; }
    .hero-stats { gap: 24px; }
    .hero-stat .number { font-size: 1.5rem; }

    .section { padding: 56px 0; }
    .section-header h2 { font-size: 1.7rem; }

    .features-grid { grid-template-columns: 1fr; }
    .resources-grid { grid-template-columns: 1fr; }
    .membership-grid { grid-template-columns: 1fr; max-width: 400px; }
    .membership-card.featured { transform: none; }
    .membership-card.featured:hover { transform: translateY(-4px); }
    .news-grid { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 24px; }
    .about-grid { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }

    .float-badge { display: none; }

    .page-banner h1 { font-size: 1.8rem; }
    .cta-box { padding: 36px 24px; }
    .cta-box h2 { font-size: 1.5rem; }
}

@media (max-width: 480px) {
    .hero h1 { font-size: 1.7rem; }
    .hero-stats { flex-wrap: wrap; gap: 16px; }
    .section-header h2 { font-size: 1.4rem; }
    .stat-item .number { font-size: 2rem; }
    .stats-grid { grid-template-columns: 1fr; }
    .resource-filters { justify-content: flex-start; overflow-x: auto; flex-wrap: nowrap; padding-bottom: 8px; }
}