/* =========================================
   网学 myeducs.cn - 公共样式表 V2
   现代学术风格 · 简洁高端设计
   ========================================= */

/* CSS Variables */
:root {
    /* 主色调 - 学术蓝 */
    --primary: #2563eb;
    --primary-light: #3b82f6;
    --primary-dark: #1d4ed8;
    --primary-50: #eff6ff;
    --primary-100: #dbeafe;

    /* 辅助色 - 金色点缀 */
    --accent: #f59e0b;
    --accent-light: #fbbf24;
    --accent-dark: #d97706;

    /* 中性色 */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    /* 功能色 */
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;

    /* 文字 */
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --text-muted: #9ca3af;
    --text-white: #ffffff;

    /* 间距 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 2rem;
    --spacing-3xl: 3rem;
    --spacing-4xl: 3.5rem;

    /* 圆角 */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* 阴影 */
    --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);

    /* 过渡 */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;

    /* 容器 */
    --container-max: 1200px;
    --container-padding: 1.5rem;
}

/* Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: #f8fafc;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

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

ul, ol {
    list-style: none;
}

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
}

/* Container */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--text-primary);
}

h1 { font-size: 2.25rem; font-weight: 700; }
h2 { font-size: 1.875rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

/* =========================================
   Navigation
   ========================================= */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--gray-200);
}

.navbar-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
    padding: 0 var(--container-padding);
    max-width: var(--container-max);
    margin: 0 auto;
}

/* Logo */
.navbar-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
}

.navbar-logo-icon {
    width: 38px;
    height: 38px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-white);
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

.navbar-logo-text {
    font-size: 1.375rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 0.08em;
}

/* Nav Menu */
.navbar-menu {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.navbar-link {
    color: var(--gray-600);
    font-weight: 500;
    font-size: 0.9375rem;
    padding: 0.5rem 0.875rem;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.navbar-link:hover {
    color: var(--primary);
    background: var(--primary-50);
}

.navbar-link.active {
    color: var(--primary);
    background: var(--primary-50);
}

.navbar-cta {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
    color: var(--text-white) !important;
    padding: 0.5rem 1.25rem !important;
    border-radius: var(--radius-full) !important;
    font-weight: 600;
    margin-left: 0.5rem;
    box-shadow: 0 2px 8px rgba(245, 158, 11, 0.3);
}

.navbar-cta:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.4);
}

.navbar-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 0.5rem;
}

.navbar-toggle span {
    width: 22px;
    height: 2px;
    background: var(--gray-600);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

/* =========================================
   Buttons
   ========================================= */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    white-space: nowrap;
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--text-white);
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(37, 99, 235, 0.35);
    color: var(--text-white);
}

.btn-secondary {
    background: var(--gray-800);
    color: var(--text-white);
}

.btn-secondary:hover {
    background: var(--gray-900);
    color: var(--text-white);
}

.btn-outline {
    border: 2px solid var(--primary);
    color: var(--primary);
    background: transparent;
}

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

.btn-ghost {
    color: var(--gray-600);
    background: transparent;
}

.btn-ghost:hover {
    background: var(--gray-100);
    color: var(--gray-800);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1rem;
    border-radius: var(--radius-xl);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-full {
    width: 100%;
}

.w-full { width: 100%; }

/* =========================================
   Cards
   ========================================= */
.card {
    background: var(--text-white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
    overflow: hidden;
    transition: all var(--transition-normal);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--gray-300);
}

.card-body {
    padding: var(--spacing-xl);
}

.card-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.card-text {
    color: var(--gray-600);
    font-size: 0.9375rem;
    line-height: 1.7;
}

/* =========================================
   Badges
   ========================================= */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-full);
}

.badge-primary {
    background: var(--primary-100);
    color: var(--primary);
}

.badge-accent {
    background: rgba(245, 158, 11, 0.15);
    color: var(--accent-dark);
}

.badge-success {
    background: rgba(16, 185, 129, 0.15);
    color: var(--success);
}

.badge-ghost {
    background: var(--gray-100);
    color: var(--gray-600);
}

/* =========================================
   Section Styles
   ========================================= */
.section {
    padding: var(--spacing-4xl) 0;
}

.section-sm {
    padding: var(--spacing-3xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-title {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.section-subtitle {
    font-size: 1.0625rem;
    color: var(--gray-500);
    max-width: 600px;
    margin: 0 auto;
}

/* =========================================
   Hero Section (Legacy - kept for compatibility)
   ========================================= */

/* =========================================
   Service Cards
   ========================================= */
.service-card {
    background: var(--text-white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
    transition: all var(--transition-normal);
    text-align: center;
}

.service-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-100);
}

.service-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary-50) 0%, var(--primary-100) 100%);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
}

.service-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.service-desc {
    color: var(--gray-500);
    font-size: 0.9375rem;
    line-height: 1.7;
}

/* =========================================
   Grid System
   ========================================= */
.grid {
    display: grid;
    gap: var(--spacing-lg);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* =========================================
   Flexbox
   ========================================= */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }

/* =========================================
   Spacing
   ========================================= */
.gap-xs { gap: var(--spacing-xs); }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }
.gap-xl { gap: var(--spacing-xl); }

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }
.mt-2xl { margin-top: var(--spacing-2xl); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }
.mb-2xl { margin-bottom: var(--spacing-2xl); }

/* =========================================
   Stats Section
   ========================================= */
.stats-section {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    padding: var(--spacing-3xl) 0;
}

.stat-item {
    text-align: center;
    color: var(--text-white);
}

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 0.25rem;
    background: linear-gradient(135deg, #fff 0%, rgba(255,255,255,0.8) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 1rem;
    opacity: 0.85;
}

/* =========================================
   CTA Section
   ========================================= */
.cta-section {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
    padding: var(--spacing-3xl) 0;
    text-align: center;
    color: var(--text-white);
}

.cta-title {
    font-size: 1.875rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.cta-desc {
    font-size: 1.0625rem;
    margin-bottom: var(--spacing-xl);
    opacity: 0.95;
}

.cta-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--text-white);
    color: var(--accent-dark);
    padding: 1rem 2.5rem;
    font-size: 1.0625rem;
    font-weight: 700;
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-fast);
}

.cta-btn:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: var(--shadow-xl);
    color: var(--accent-dark);
}

/* =========================================
   Resource Card
   ========================================= */
.resource-card {
    background: var(--text-white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
    transition: all var(--transition-normal);
}

.resource-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-100);
}

.resource-category {
    display: inline-block;
    background: var(--primary-50);
    color: var(--primary);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.resource-title {
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

.resource-features {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
    margin-bottom: var(--spacing-md);
}

.resource-feature {
    background: var(--gray-100);
    color: var(--gray-600);
    padding: 0.25rem 0.625rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
}

.resource-price-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-dark);
}

.resource-price-unit {
    color: var(--gray-400);
    font-size: 0.875rem;
}

/* =========================================
   Case Card
   ========================================= */
.case-card {
    background: var(--text-white);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
    transition: all var(--transition-normal);
}

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

.case-image {
    height: 180px;
    background: linear-gradient(135deg, var(--gray-100) 0%, var(--gray-200) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: var(--gray-400);
}

.case-content {
    padding: var(--spacing-lg);
}

.case-tag {
    display: inline-block;
    background: var(--primary-50);
    color: var(--primary);
    padding: 0.25rem 0.625rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.case-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    line-height: 1.4;
}

.case-meta {
    color: var(--gray-400);
    font-size: 0.8125rem;
}

/* =========================================
   Article Card
   ========================================= */
.article-card {
    background: var(--text-white);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
    transition: all var(--transition-normal);
}

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

.article-image {
    height: 140px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
}

.article-content {
    padding: var(--spacing-lg);
}

.article-category {
    color: var(--primary);
    font-size: 0.8125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.article-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-meta {
    display: flex;
    gap: var(--spacing-md);
    color: var(--gray-400);
    font-size: 0.8125rem;
}

/* =========================================
   Filter Bar
   ========================================= */
.filter-bar {
    background: var(--text-white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
    margin-bottom: var(--spacing-xl);
}

.filter-group {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    align-items: center;
}

.filter-label {
    font-weight: 600;
    color: var(--gray-700);
    margin-right: 0.5rem;
    font-size: 0.9375rem;
}

.filter-btn {
    padding: 0.5rem 1rem;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-600);
    background: var(--gray-100);
    transition: all var(--transition-fast);
    border: 1px solid transparent;
}

.filter-btn:hover {
    background: var(--primary-50);
    color: var(--primary);
}

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

/* =========================================
   Pricing Card
   ========================================= */
.pricing-card {
    background: var(--text-white);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-2xl);
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
    position: relative;
    transition: all var(--transition-normal);
}

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

.pricing-card.featured {
    border: 2px solid var(--accent);
    box-shadow: var(--shadow-lg);
}

.pricing-card.featured::before {
    content: '热门推荐';
    position: absolute;
    top: -1px;
    right: 24px;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
    color: var(--text-white);
    padding: 0.375rem 1rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 0 0 var(--radius-md) var(--radius-md);
}

.pricing-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.pricing-price {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
}

.pricing-price span {
    font-size: 1rem;
    color: var(--gray-400);
    font-weight: 400;
}

.pricing-features {
    text-align: left;
    margin-bottom: var(--spacing-xl);
}

.pricing-feature {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0;
    color: var(--gray-600);
    font-size: 0.9375rem;
}

.pricing-feature::before {
    content: '✓';
    color: var(--success);
    font-weight: 700;
}

/* =========================================
   Advantage Item
   ========================================= */
.advantage-item {
    display: flex;
    gap: var(--spacing-lg);
    padding: var(--spacing-xl);
    background: var(--text-white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
    transition: all var(--transition-normal);
}

.advantage-item:hover {
    transform: translateX(4px);
    border-color: var(--primary-100);
}

.advantage-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-white);
    font-size: 1.5rem;
    flex-shrink: 0;
}

.advantage-content h4 {
    color: var(--text-primary);
    margin-bottom: 0.375rem;
    font-size: 1.0625rem;
}

.advantage-content p {
    color: var(--gray-500);
    font-size: 0.9375rem;
    line-height: 1.6;
}

/* =========================================
   Step Item
   ========================================= */
.step-item {
    text-align: center;
    padding: var(--spacing-xl);
}

.step-number {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-white);
    margin: 0 auto var(--spacing-lg);
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
}

.step-title {
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.375rem;
}

.step-desc {
    color: var(--gray-500);
    font-size: 0.9375rem;
}

/* =========================================
   Form Styles
   ========================================= */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-size: 0.9375rem;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    transition: all var(--transition-fast);
    background: var(--text-white);
}

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

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

/* =========================================
   Tags
   ========================================= */
.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    display: inline-block;
    padding: 0.375rem 0.875rem;
    background: var(--gray-100);
    color: var(--gray-600);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.tag:hover {
    background: var(--primary-50);
    color: var(--primary);
}

/* =========================================
   Banner
   ========================================= */
.banner {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
    padding: var(--spacing-xl) var(--spacing-2xl);
    border-radius: var(--radius-2xl);
    color: var(--text-white);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-xl);
}

.banner-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.banner-desc {
    font-size: 1rem;
    opacity: 0.9;
}

/* =========================================
   Footer
   ========================================= */
.footer {
    background: var(--gray-900);
    color: var(--text-white);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-brand {
    font-size: 1.375rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    letter-spacing: 0.05em;
}

.footer-desc {
    color: var(--gray-400);
    line-height: 1.8;
    font-size: 0.9375rem;
}

.footer-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--text-white);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
}

.footer-link {
    color: var(--gray-400);
    font-size: 0.9375rem;
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--text-white);
}

.footer-bottom {
    border-top: 1px solid var(--gray-700);
    padding-top: var(--spacing-xl);
    text-align: center;
    color: var(--gray-500);
    font-size: 0.875rem;
}

/* =========================================
   Floating Contact
   ========================================= */
.floating-contact {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.floating-btn {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-fast);
    color: var(--text-white);
    font-size: 1.25rem;
    border: none;
    cursor: pointer;
}

.floating-btn:hover {
    transform: scale(1.1);
}

.floating-btn.primary {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
}

.floating-btn.secondary {
    background: var(--gray-700);
}

.floating-btn.wechat {
    background: #07c160;
}

/* =========================================
   Responsive Design
   ========================================= */
@media (max-width: 1024px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
    .hero-title { font-size: 2.25rem; }
}

@media (max-width: 768px) {
    :root {
        --container-padding: 1rem;
    }

    .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
    }

    .navbar-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--text-white);
        flex-direction: column;
        padding: var(--spacing-lg);
        box-shadow: var(--shadow-lg);
        border-top: 1px solid var(--gray-200);
    }

    .navbar-menu.active {
        display: flex;
    }

    .navbar-toggle {
        display: flex;
    }

    .navbar-link {
        width: 100%;
        padding: 0.75rem 1rem;
    }

    .navbar-cta {
        margin-left: 0;
        margin-top: 0.5rem;
        text-align: center;
        justify-content: center;
    }

    .section {
        padding: var(--spacing-3xl) 0;
    }

    .section-title { font-size: 1.5rem; }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

    .banner {
        flex-direction: column;
        text-align: center;
        padding: var(--spacing-xl);
    }

    .floating-contact {
        bottom: 16px;
        right: 16px;
    }

    .floating-btn {
        width: 48px;
        height: 48px;
        font-size: 1.125rem;
    }

    .filter-group {
        justify-content: center;
    }

    .pricing-card {
        padding: var(--spacing-xl);
    }

    .pricing-price {
        font-size: 2rem;
    }

    .stat-number {
        font-size: 2.5rem;
    }
}

@media (max-width: 480px) {
    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }

    .service-icon {
        width: 64px;
        height: 64px;
        font-size: 1.75rem;
    }
}

/* =========================================
   Utilities
   ========================================= */
.hidden { display: none !important; }
.relative { position: relative; }
.absolute { position: absolute; }
.overflow-hidden { overflow: hidden; }
.cursor-pointer { cursor: pointer; }
.text-muted { color: var(--gray-500); }
.text-primary { color: var(--primary); }
.text-accent { color: var(--accent); }
.text-white { color: var(--text-white); }
.text-secondary { color: var(--text-secondary); }
.bg-white { background: var(--text-white); }
.bg-gray { background: var(--gray-50); }
.rounded { border-radius: var(--radius-lg); }
.shadow { box-shadow: var(--shadow-md); }

/* Animation */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-fadeIn {
    animation: fadeIn 0.6s ease forwards;
}