/* ===================================
   豆包 GEO 优化官网 - 全局样式表
   风格：白色系、字节风格、简洁现代
   =================================== */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

/* ===================================
   CSS Variables / Design Tokens
   =================================== */
:root {
    /* 颜色系统 */
    --color-primary: #0066FF;        /* 豆包蓝 */
    --color-primary-dark: #0052CC;   /* 深蓝 */
    --color-primary-light: #E6F0FF; /* 浅蓝背景 */
    --color-success: #10B981;        /* 推荐标签绿 */
    --color-purple: #7C3AED;         /* 专业标签紫 */
    
    /* 背景色 */
    --bg-white: #FFFFFF;
    --bg-gray: #F5F7FA;
    --bg-gray-dark: #F0F2F5;
    
    /* 文字色 */
    --text-primary: #1F2937;
    --text-secondary: #6B7280;
    --text-muted: #9CA3AF;
    
    /* 边框色 */
    --border-color: #E5E7EB;
    --border-light: #F3F4F6;
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
    
    /* 间距 */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;
    --space-4xl: 80px;
    
    /* 字体 */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    /* 过渡 */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-white);
}

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

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

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

ul, ol {
    list-style: none;
}

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

input, textarea {
    font-family: inherit;
    font-size: inherit;
}

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

h1 {
    font-size: 48px;
    letter-spacing: -1.5px;
}

h2 {
    font-size: 36px;
    letter-spacing: -1px;
}

h3 {
    font-size: 28px;
    letter-spacing: -0.5px;
}

h4 {
    font-size: 20px;
}

h5 {
    font-size: 18px;
}

h6 {
    font-size: 16px;
}

p {
    margin-bottom: var(--space-md);
}

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

.text-muted {
    color: var(--text-secondary);
}

/* ===================================
   Layout
   =================================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.section {
    padding: var(--space-4xl) 0;
}

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

/* ===================================
   Navigation
   =================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 64px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-light);
    z-index: 1000;
    transition: box-shadow var(--transition-normal);
}

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

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.nav-logo svg {
    width: 32px;
    height: 32px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.nav-links a {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

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

.nav-cta {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.mobile-menu-btn {
    display: none;
    width: 32px;
    height: 32px;
    flex-direction: column;
    justify-content: center;
    gap: 6px;
}

.mobile-menu-btn span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-fast);
}

/* ===================================
   Buttons
   =================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 12px 24px;
    font-size: 14px;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    cursor: pointer;
}

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

.btn-primary:hover {
    background: var(--color-primary-dark);
    color: white;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--bg-white);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-gray);
    border-color: var(--text-muted);
}

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border: 1px solid var(--color-primary);
}

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

.btn-lg {
    padding: 16px 32px;
    font-size: 16px;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 13px;
}

/* ===================================
   Cards
   =================================== */
.card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    border: 1px solid var(--border-light);
    transition: all var(--transition-normal);
}

.card:hover {
    border-color: var(--border-color);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.card-header {
    margin-bottom: var(--space-lg);
}

.card-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.card-description {
    color: var(--text-secondary);
    font-size: 15px;
}

.card-icon {
    width: 48px;
    height: 48px;
    background: var(--color-primary-light);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-md);
}

.card-icon svg {
    width: 24px;
    height: 24px;
    color: var(--color-primary);
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    padding: 160px 0 100px;
    background: linear-gradient(180deg, var(--bg-white) 0%, var(--bg-gray) 100%);
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 8px 16px;
    background: var(--color-primary-light);
    color: var(--color-primary);
    font-size: 13px;
    font-weight: 500;
    border-radius: var(--radius-full);
    margin-bottom: var(--space-lg);
}

.hero h1 {
    margin-bottom: var(--space-lg);
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    margin-bottom: var(--space-3xl);
}

.hero-features {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-lg);
}

.hero-feature {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 14px;
    color: var(--text-secondary);
}

.hero-feature svg {
    width: 20px;
    height: 20px;
    color: var(--color-success);
}

/* ===================================
   Stats Section
   =================================== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-xl);
}

.stat-card {
    text-align: center;
    padding: var(--space-xl);
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
}

.stat-number {
    font-size: 42px;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--space-sm);
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ===================================
   Services Grid
   =================================== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
}

.service-card {
    padding: var(--space-2xl);
}

.service-card h4 {
    margin-bottom: var(--space-md);
}

/* ===================================
   Scene Cards
   =================================== */
.scenes-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-lg);
}

.scene-card {
    padding: var(--space-xl);
    text-align: center;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    transition: all var(--transition-normal);
}

.scene-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-lg);
}

.scene-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto var(--space-md);
    background: var(--color-primary-light);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
}

.scene-icon svg {
    width: 28px;
    height: 28px;
    color: var(--color-primary);
}

.scene-card h4 {
    font-size: 16px;
    margin-bottom: var(--space-sm);
}

.scene-card p {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 0;
}

/* ===================================
   Case Cards
   =================================== */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
}

.case-card {
    overflow: hidden;
}

.case-card .card-content {
    padding: var(--space-xl);
}

.case-tag {
    display: inline-block;
    padding: 4px 12px;
    background: var(--color-primary-light);
    color: var(--color-primary);
    font-size: 12px;
    font-weight: 500;
    border-radius: var(--radius-full);
    margin-bottom: var(--space-md);
}

.case-card h4 {
    margin-bottom: var(--space-sm);
}

.case-card p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: var(--space-md);
}

.case-result {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px solid var(--border-light);
}

.case-stat {
    text-align: center;
}

.case-stat-value {
    font-size: 24px;
    font-weight: 700;
    color: var(--color-primary);
}

.case-stat-label {
    font-size: 12px;
    color: var(--text-muted);
}

/* ===================================
   Pricing Cards
   =================================== */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
    align-items: start;
}

.pricing-card {
    padding: var(--space-2xl);
    position: relative;
}

.pricing-card.featured {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-xl);
    transform: scale(1.02);
}

.pricing-card.pro {
    border-color: var(--color-purple);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    padding: 6px 16px;
    font-size: 12px;
    font-weight: 600;
    border-radius: var(--radius-full);
}

.pricing-badge.recommended {
    background: var(--color-success);
    color: white;
}

.pricing-badge.pro {
    background: var(--color-purple);
    color: white;
}

.pricing-header {
    text-align: center;
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid var(--border-light);
    margin-bottom: var(--space-xl);
}

.pricing-name {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.pricing-price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 4px;
}

.pricing-currency {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-secondary);
}

.pricing-amount {
    font-size: 48px;
    font-weight: 700;
    color: var(--text-primary);
}

.pricing-period {
    font-size: 14px;
    color: var(--text-muted);
}

.pricing-target {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: var(--space-sm);
}

.pricing-features {
    margin-bottom: var(--space-xl);
}

.pricing-features li {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    padding: var(--space-sm) 0;
    font-size: 14px;
    color: var(--text-secondary);
}

.pricing-features li svg {
    width: 20px;
    height: 20px;
    color: var(--color-success);
    flex-shrink: 0;
    margin-top: 2px;
}

.pricing-card .btn {
    width: 100%;
}

/* ===================================
   FAQ Section
   =================================== */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--border-light);
}

.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: var(--space-lg) 0;
    font-size: 16px;
    font-weight: 500;
    text-align: left;
    color: var(--text-primary);
    cursor: pointer;
}

.faq-question svg {
    width: 20px;
    height: 20px;
    color: var(--text-muted);
    transition: transform var(--transition-fast);
}

.faq-item.active .faq-question svg {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal);
}

.faq-item.active .faq-answer {
    max-height: 200px;
}

.faq-answer p {
    padding-bottom: var(--space-lg);
    color: var(--text-secondary);
    font-size: 15px;
}

/* ===================================
   Contact Section
   =================================== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
}

.contact-info h3 {
    margin-bottom: var(--space-lg);
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.contact-item-icon {
    width: 48px;
    height: 48px;
    background: var(--color-primary-light);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-item-icon svg {
    width: 24px;
    height: 24px;
    color: var(--color-primary);
}

.contact-item h5 {
    margin-bottom: 4px;
}

.contact-item p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 0;
}

.contact-qr {
    margin-top: var(--space-xl);
    padding: var(--space-lg);
    background: var(--bg-gray);
    border-radius: var(--radius-lg);
    text-align: center;
}

.contact-qr img {
    width: 160px;
    height: 160px;
    margin: 0 auto var(--space-md);
}

.contact-qr p {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 0;
}

.contact-form {
    background: var(--bg-white);
    padding: var(--space-2xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
}

.form-group {
    margin-bottom: var(--space-lg);
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 15px;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

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

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
}

/* ===================================
   CTA Section
   =================================== */
.cta-section {
    background: linear-gradient(135deg, var(--color-primary) 0%, #0052CC 100%);
    color: white;
    text-align: center;
    padding: var(--space-4xl) 0;
}

.cta-section h2 {
    color: white;
    margin-bottom: var(--space-md);
}

.cta-section p {
    font-size: 18px;
    opacity: 0.9;
    margin-bottom: var(--space-xl);
}

.cta-section .btn-primary {
    background: white;
    color: var(--color-primary);
}

.cta-section .btn-primary:hover {
    background: var(--bg-gray);
}

/* ===================================
   Footer
   =================================== */
.footer {
    background: var(--bg-gray);
    padding: var(--space-3xl) 0 var(--space-xl);
    border-top: 1px solid var(--border-light);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-2xl);
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-top: var(--space-md);
    max-width: 300px;
}

.footer-links h5 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.footer-links ul li {
    margin-bottom: var(--space-sm);
}

.footer-links ul li a {
    font-size: 14px;
    color: var(--text-secondary);
}

.footer-links ul li a:hover {
    color: var(--text-primary);
}

.footer-bottom {
    padding-top: var(--space-xl);
    border-top: 1px solid var(--border-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-copyright {
    font-size: 13px;
    color: var(--text-muted);
}

.footer-contact {
    display: flex;
    gap: var(--space-lg);
}

.footer-contact a {
    font-size: 13px;
    color: var(--text-secondary);
}

/* ===================================
   Page Header
   =================================== */
.page-header {
    padding: 140px 0 80px;
    background: linear-gradient(180deg, var(--bg-white) 0%, var(--bg-gray) 100%);
    text-align: center;
}

.page-header h1 {
    margin-bottom: var(--space-md);
}

.page-header p {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ===================================
   Platform Section (Doubao)
   =================================== */
.platform-intro {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    align-items: center;
}

.platform-content h2 {
    margin-bottom: var(--space-lg);
}

.platform-content p {
    color: var(--text-secondary);
    font-size: 16px;
    line-height: 1.8;
}

.platform-visual {
    background: var(--bg-gray);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
}

.doubao-mockup {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.mockup-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md);
    background: var(--bg-gray);
    border-bottom: 1px solid var(--border-light);
}

.mockup-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.mockup-dot.red { background: #FF5F57; }
.mockup-dot.yellow { background: #FEBC2E; }
.mockup-dot.green { background: #28C840; }

.mockup-content {
    padding: var(--space-lg);
}

.mockup-message {
    background: var(--color-primary);
    color: white;
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-md);
    max-width: 80%;
}

.mockup-response {
    background: var(--bg-gray);
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
}

.mockup-response h5 {
    font-size: 14px;
    color: var(--color-primary);
    margin-bottom: var(--space-sm);
}

.mockup-response p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
}

.mockup-response .brand-tag {
    display: inline-block;
    padding: 4px 12px;
    background: var(--color-primary-light);
    color: var(--color-primary);
    font-size: 12px;
    border-radius: var(--radius-full);
}

/* ===================================
   Advantages List
   =================================== */
.advantages-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
}

.advantage-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-lg);
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
}

.advantage-icon {
    width: 40px;
    height: 40px;
    background: var(--color-primary-light);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.advantage-icon svg {
    width: 20px;
    height: 20px;
    color: var(--color-primary);
}

.advantage-item h4 {
    font-size: 16px;
    margin-bottom: 4px;
}

.advantage-item p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 0;
}

/* ===================================
   Discount Section
   =================================== */
.discount-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-xl);
    max-width: 700px;
    margin: 0 auto;
}

.discount-card {
    padding: var(--space-2xl);
    text-align: center;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    border: 2px solid var(--color-primary);
}

.discount-card h4 {
    font-size: 18px;
    margin-bottom: var(--space-sm);
}

.discount-value {
    font-size: 36px;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--space-sm);
}

.discount-card p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 0;
}

/* ===================================
   Guarantee Section
   =================================== */
.guarantee-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

.guarantee-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
}

.guarantee-item svg {
    width: 24px;
    height: 24px;
    color: var(--color-success);
    flex-shrink: 0;
}

.guarantee-item span {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ===================================
   Case Detail Section
   =================================== */
.case-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    align-items: center;
    padding: var(--space-3xl) 0;
    border-bottom: 1px solid var(--border-light);
}

.case-detail:last-child {
    border-bottom: none;
}

.case-detail.reverse {
    direction: rtl;
}

.case-detail.reverse > * {
    direction: ltr;
}

.case-info h3 {
    margin-bottom: var(--space-md);
}

.case-info p {
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
}

.case-metrics {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.case-metric {
    text-align: center;
    padding: var(--space-md);
    background: var(--bg-gray);
    border-radius: var(--radius-md);
}

.case-metric-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--color-primary);
}

.case-metric-label {
    font-size: 13px;
    color: var(--text-muted);
}

/* ===================================
   Service Detail Section
   =================================== */
.service-detail-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-xl);
}

.service-detail-card {
    padding: var(--space-2xl);
}

.service-detail-card .card-icon {
    width: 64px;
    height: 64px;
}

.service-detail-card .card-icon svg {
    width: 32px;
    height: 32px;
}

.service-detail-card h3 {
    margin-bottom: var(--space-md);
}

.service-detail-card ul {
    margin-top: var(--space-lg);
}

.service-detail-card li {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    padding: var(--space-sm) 0;
    font-size: 14px;
    color: var(--text-secondary);
}

.service-detail-card li svg {
    width: 18px;
    height: 18px;
    color: var(--color-primary);
    flex-shrink: 0;
    margin-top: 2px;
}

/* ===================================
   Mobile Menu
   =================================== */
.mobile-menu {
    display: none;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-white);
    padding: var(--space-xl);
    z-index: 999;
}

.mobile-menu.active {
    display: block;
}

.mobile-menu a {
    display: block;
    padding: var(--space-md) 0;
    font-size: 16px;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-light);
}

.mobile-menu .btn {
    width: 100%;
    margin-top: var(--space-lg);
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 1024px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .scenes-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin: 0 auto;
    }
    
    .pricing-card.featured {
        transform: none;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .platform-intro {
        grid-template-columns: 1fr;
    }
    
    .platform-visual {
        order: -1;
    }
    
    .case-detail {
        grid-template-columns: 1fr;
    }
    
    .case-detail.reverse {
        direction: ltr;
    }
}

@media (max-width: 768px) {
    h1 {
        font-size: 36px;
    }
    
    h2 {
        font-size: 28px;
    }
    
    h3 {
        font-size: 22px;
    }
    
    .section {
        padding: var(--space-3xl) 0;
    }
    
    .hero {
        padding: 120px 0 60px;
    }
    
    .hero-subtitle {
        font-size: 17px;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .nav-links,
    .nav-cta {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-md);
    }
    
    .stat-number {
        font-size: 32px;
    }
    
    .services-grid,
    .scenes-grid,
    .cases-grid,
    .service-detail-grid {
        grid-template-columns: 1fr;
    }
    
    .advantages-list {
        grid-template-columns: 1fr;
    }
    
    .guarantee-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        gap: var(--space-xl);
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--space-md);
        text-align: center;
    }
    
    .page-header {
        padding: 120px 0 60px;
    }
    
    .case-metrics {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .discount-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-md);
    }
    
    h1 {
        font-size: 28px;
    }
    
    .hero-features {
        flex-direction: column;
        align-items: center;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .pricing-price {
        justify-content: center;
    }
    
    .pricing-amount {
        font-size: 40px;
    }
}

/* ===================================
   Animations
   =================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

.animate-fade-in-up {
    animation: fadeInUp 0.6s ease forwards;
}

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

/* ===================================
   Utilities
   =================================== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.hidden {
    display: none !important;
}

.visible {
    display: block !important;
}