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

:root {
    --color-primary: #2563EB;
    --color-primary-light: #3B82F6;
    --color-primary-lighter: #60A5FA;
    --color-primary-dark: #1D4ED8;
    --color-primary-bg: #EFF6FF;
    --color-primary-bg-light: #F8FAFF;
    
    --color-accent: #0EA5E9;
    --color-success: #10B981;
    --color-warning: #F59E0B;
    --color-error: #EF4444;
    
    --color-text: #0F172A;
    --color-text-secondary: #475569;
    --color-text-muted: #94A3B8;
    --color-text-light: #CBD5E1;
    
    --color-bg: #FFFFFF;
    --color-bg-secondary: #F8FAFC;
    --color-bg-tertiary: #F1F5F9;
    
    --color-border: #E2E8F0;
    --color-border-light: #F1F5F9;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.06), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-primary: 0 8px 24px rgba(37, 99, 235, 0.2);
    
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    --transition: 0.2s ease;
    --transition-slow: 0.3s ease;
    
    --nav-height: 72px;
    --container-max: 1200px;
}

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

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

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

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

ul, ol {
    list-style: none;
}

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

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 32px;
}

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--color-border-light);
    z-index: 1000;
    transform: translateY(0);
    transition: transform var(--transition-slow), box-shadow var(--transition);
}

.header.hidden {
    transform: translateY(-100%);
}

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

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 700;
    color: var(--color-text);
}

.logo-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    background-image: url('law2.png');
    background-size: cover;
    background-position: center;
}

.nav {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav a {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-secondary);
    padding: 8px 16px;
    border-radius: var(--radius-full);
    transition: all var(--transition);
}

.nav a:hover {
    color: var(--color-primary);
    background: var(--color-primary-bg);
}

.nav a.active {
    color: #fff;
    background: var(--color-primary);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: background var(--transition);
}

.mobile-menu-btn:hover {
    background: var(--color-bg-secondary);
}

.mobile-menu-btn span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--color-text-secondary);
    border-radius: 1px;
    transition: all var(--transition);
}

.fullscreen-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero-section {
    background: linear-gradient(135deg, var(--color-primary-bg-light) 0%, var(--color-bg) 50%, var(--color-bg-secondary) 100%);
    padding-top: var(--nav-height);
}

.hero-section .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    min-height: calc(100vh - var(--nav-height));
}

.hero-content {
    max-width: 560px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: 13px;
    color: var(--color-text-secondary);
    margin-bottom: 24px;
}

.hero-badge svg {
    width: 14px;
    height: 14px;
    color: var(--color-primary);
}

.hero-title {
    font-size: 56px;
    font-weight: 700;
    color: var(--color-text);
    line-height: 1.1;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.hero-title span {
    color: var(--color-primary);
}

.hero-subtitle {
    font-size: 20px;
    color: var(--color-text-secondary);
    margin-bottom: 32px;
    line-height: 1.7;
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-bottom: 40px;
}

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

.hero-stat-value {
    font-size: 32px;
    font-weight: 700;
    color: var(--color-text);
    line-height: 1;
}

.hero-stat-label {
    font-size: 14px;
    color: var(--color-text-muted);
    margin-top: 4px;
}

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

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.hero-phone {
    width: 280px;
    height: 560px;
    background: linear-gradient(145deg, var(--color-text) 0%, #1e293b 100%);
    border-radius: 40px;
    padding: 12px;
    box-shadow: var(--shadow-xl), 0 0 0 1px rgba(255,255,255,0.1) inset;
    position: relative;
}

.hero-phone::before {
    content: '';
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 24px;
    background: #0f172a;
    border-radius: 12px;
}

.hero-phone-screen {
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, var(--color-primary-bg) 0%, var(--color-bg) 100%);
    border-radius: 32px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.hero-phone-header {
    padding: 48px 20px 16px;
    text-align: center;
}

.hero-phone-header h4 {
    font-size: 16px;
    color: var(--color-text);
    font-weight: 600;
}

.hero-phone-content {
    flex: 1;
    padding: 0 16px 16px;
}

.hero-phone-item {
    background: var(--color-bg);
    border-radius: var(--radius-md);
    padding: 14px;
    margin-bottom: 10px;
    border: 1px solid var(--color-border-light);
}

.hero-phone-item-title {
    font-size: 13px;
    color: var(--color-text);
    font-weight: 500;
    margin-bottom: 4px;
}

.hero-phone-item-desc {
    font-size: 11px;
    color: var(--color-text-muted);
}

.hero-decoration {
    position: absolute;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.hero-decoration-1 {
    top: -100px;
    right: -100px;
}

.hero-decoration-2 {
    bottom: -150px;
    left: -150px;
    width: 500px;
    height: 500px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    font-size: 15px;
    font-weight: 500;
    border-radius: var(--radius-full);
    transition: all var(--transition);
    cursor: pointer;
    border: none;
}

.btn svg {
    width: 18px;
    height: 18px;
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
    box-shadow: var(--shadow-primary);
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 12px 28px rgba(37, 99, 235, 0.25);
}

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

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

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

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

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

.btn-sm {
    padding: 10px 20px;
    font-size: 14px;
}

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

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 64px;
}

.section-tag {
    display: inline-block;
    padding: 6px 14px;
    background: var(--color-primary-bg);
    color: var(--color-primary);
    font-size: 13px;
    font-weight: 500;
    border-radius: var(--radius-full);
    margin-bottom: 16px;
}

.section-title {
    font-size: 40px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.section-desc {
    font-size: 17px;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

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

.feature-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: all var(--transition);
}

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

.feature-card-large {
    grid-column: span 2;
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 32px;
    align-items: center;
    padding: 40px;
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: var(--color-primary-bg);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    transition: all var(--transition);
}

.feature-card-large .feature-icon {
    width: 72px;
    height: 72px;
    margin-bottom: 0;
}

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

.feature-card-large .feature-icon svg {
    width: 32px;
    height: 32px;
}

.feature-card:hover .feature-icon {
    background: var(--color-primary);
}

.feature-card:hover .feature-icon svg {
    color: #fff;
}

.feature-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 8px;
}

.feature-card-large .feature-title {
    font-size: 22px;
    margin-bottom: 12px;
}

.feature-desc {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.feature-list {
    display: flex;
    gap: 20px;
    margin-top: 16px;
    flex-wrap: wrap;
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--color-text-secondary);
}

.feature-list li::before {
    content: '';
    width: 6px;
    height: 6px;
    background: var(--color-primary);
    border-radius: 50%;
}

.download-section {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    position: relative;
    overflow: hidden;
}

.download-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='0.03'%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");
    pointer-events: none;
}

.download-section .container {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 120px 32px;
}

.download-title {
    font-size: 48px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.download-desc {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 40px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.download-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.btn-white {
    background: #fff;
    color: var(--color-primary);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

.btn-white:hover {
    background: var(--color-bg-secondary);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.download-features {
    display: flex;
    justify-content: center;
    gap: 32px;
    flex-wrap: wrap;
}

.download-feature {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.9);
}

.download-feature svg {
    width: 16px;
    height: 16px;
    color: rgba(255, 255, 255, 0.9);
}

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

.code-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.code-content .section-tag {
    margin-bottom: 16px;
}

.code-content .section-title {
    text-align: left;
    margin-bottom: 16px;
}

.code-content > p {
    font-size: 16px;
    color: var(--color-text-secondary);
    margin-bottom: 40px;
}

.code-list {
    margin-bottom: 32px;
}

.code-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 0;
    border-bottom: 1px solid var(--color-border-light);
}

.code-item:last-child {
    border-bottom: none;
}

.code-number {
    width: 40px;
    height: 40px;
    background: var(--color-primary-bg);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 600;
    color: var(--color-primary);
    flex-shrink: 0;
}

.code-info h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 2px;
}

.code-info p {
    font-size: 13px;
    color: var(--color-text-muted);
}

.code-visual {
    display: flex;
    justify-content: center;
}

.code-card-visual {
    background: linear-gradient(145deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    border-radius: var(--radius-xl);
    padding: 40px;
    width: 100%;
    max-width: 380px;
}

.code-card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 32px;
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}

.code-card-header svg {
    width: 28px;
    height: 28px;
    color: #fff;
}

.code-card-header span {
    font-size: 16px;
    font-weight: 600;
    color: #fff;
}

.code-card-stats {
    display: flex;
    justify-content: space-between;
    margin-bottom: 24px;
}

.code-card-stat {
    text-align: center;
}

.code-card-stat-value {
    font-size: 28px;
    font-weight: 700;
    color: #fff;
    line-height: 1;
}

.code-card-stat-label {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.75);
    margin-top: 4px;
}

.code-card-desc {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.85);
    text-align: center;
    line-height: 1.7;
}

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

.qa-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.qa-content .section-tag {
    margin-bottom: 16px;
}

.qa-content .section-title {
    text-align: left;
    margin-bottom: 16px;
}

.qa-content > p {
    font-size: 16px;
    color: var(--color-text-secondary);
    margin-bottom: 32px;
}

.qa-categories {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 32px;
}

.qa-category {
    padding: 8px 16px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: 14px;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition);
}

.qa-category:hover,
.qa-category.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
}

.qa-preview {
    background: var(--color-bg-secondary);
    border-radius: var(--radius-xl);
    padding: 32px;
}

.qa-preview-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--color-border);
}

.qa-preview-icon {
    width: 40px;
    height: 40px;
    background: var(--color-primary-bg);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.qa-preview-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text);
}

.qa-items {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.qa-item {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 16px;
    cursor: pointer;
    transition: all var(--transition);
}

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

.qa-item-question {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: 6px;
}

.qa-item-answer {
    font-size: 13px;
    color: var(--color-text-secondary);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

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

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

.why-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    text-align: center;
    transition: all var(--transition);
}

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

.why-icon {
    width: 64px;
    height: 64px;
    background: var(--color-primary-bg);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    transition: all var(--transition);
}

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

.why-card:hover .why-icon {
    background: var(--color-primary);
}

.why-card:hover .why-icon svg {
    color: #fff;
}

.why-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 12px;
}

.why-desc {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.footer {
    background: var(--color-text);
    color: var(--color-text-light);
    padding: 80px 0 32px;
}

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

.footer-brand h3 {
    font-size: 20px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 12px;
}

.footer-brand p {
    font-size: 14px;
    color: var(--color-text-light);
    line-height: 1.7;
}

.footer-links h4 {
    font-size: 14px;
    font-weight: 600;
    color: #fff;
    margin-bottom: 20px;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    font-size: 14px;
    color: var(--color-text-light);
    transition: color var(--transition);
}

.footer-links a:hover {
    color: #fff;
}

.footer-bottom {
    text-align: center;
    padding-top: 32px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

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

.page-header {
    background: linear-gradient(180deg, var(--color-primary-bg-light) 0%, var(--color-bg) 100%);
    padding: calc(var(--nav-height) + 60px) 0 60px;
    text-align: center;
}

.page-header .section-tag {
    margin-bottom: 16px;
}

.page-header h1 {
    font-size: 40px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 16px;
}

.page-header p {
    font-size: 17px;
    color: var(--color-text-secondary);
    max-width: 500px;
    margin: 0 auto;
}

.breadcrumb {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-bottom: 24px;
    font-size: 14px;
    color: var(--color-text-muted);
}

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

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

.content-section {
    padding: 80px 0;
}

.content-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 40px;
    margin-bottom: 24px;
}

.content-card h2 {
    font-size: 22px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--color-primary-bg);
}

.content-card h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text);
    margin: 24px 0 12px;
}

.content-card p {
    font-size: 15px;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 16px;
}

.content-card ul,
.content-card ol {
    margin-left: 20px;
    margin-bottom: 16px;
}

.content-card li {
    font-size: 15px;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 8px;
    padding-left: 16px;
    position: relative;
}

.content-card ul li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 6px;
    height: 6px;
    background: var(--color-primary);
    border-radius: 50%;
}

.content-card ol {
    list-style: decimal;
    padding-left: 20px;
}

.content-card ol li {
    padding-left: 0;
}

.highlight-box {
    background: var(--color-primary-bg);
    border-left: 3px solid var(--color-primary);
    border-radius: var(--radius-md);
    padding: 20px 24px;
    margin: 20px 0;
}

.highlight-box p {
    margin: 0;
    color: var(--color-text);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-bottom: 12px;
    overflow: hidden;
    transition: all var(--transition);
}

.faq-item:hover {
    border-color: var(--color-primary-light);
}

.faq-item.active {
    border-color: var(--color-primary);
}

.faq-question {
    padding: 20px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-size: 15px;
    font-weight: 500;
    color: var(--color-text);
    transition: background var(--transition);
}

.faq-question:hover {
    background: var(--color-bg-secondary);
}

.faq-icon {
    width: 24px;
    height: 24px;
    background: var(--color-bg-secondary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    color: var(--color-text-muted);
    transition: all var(--transition);
    flex-shrink: 0;
}

.faq-item.active .faq-icon {
    background: var(--color-primary);
    color: #fff;
    transform: rotate(45deg);
}

.faq-answer {
    padding: 0 24px;
    max-height: 0;
    overflow: hidden;
    transition: all var(--transition-slow);
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.8;
}

.faq-item.active .faq-answer {
    padding: 0 24px 20px;
    max-height: 500px;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    max-width: 900px;
    margin: 0 auto;
}

.contact-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    text-align: center;
    transition: all var(--transition);
}

.contact-card:hover {
    border-color: var(--color-primary-light);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.contact-icon {
    width: 56px;
    height: 56px;
    background: var(--color-primary-bg);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    transition: all var(--transition);
}

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

.contact-card:hover .contact-icon {
    background: var(--color-primary);
}

.contact-card:hover .contact-icon svg {
    color: #fff;
}

.contact-card h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 8px;
}

.contact-card p {
    font-size: 14px;
    color: var(--color-text-secondary);
}

.contact-card a {
    color: var(--color-primary);
    font-weight: 500;
}

.feature-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    margin-bottom: 80px;
}

.feature-detail:nth-child(even) {
    direction: rtl;
}

.feature-detail:nth-child(even) > * {
    direction: ltr;
}

.feature-detail-content h3 {
    font-size: 28px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 16px;
}

.feature-detail-content p {
    font-size: 15px;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 24px;
}

.feature-detail-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.feature-detail-list li {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    color: var(--color-text-secondary);
}

.feature-detail-list li::before {
    content: '';
    width: 20px;
    height: 20px;
    background: var(--color-primary-bg);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.feature-detail-visual {
    background: linear-gradient(135deg, var(--color-primary-bg) 0%, var(--color-bg-tertiary) 100%);
    border-radius: var(--radius-xl);
    padding: 48px;
    min-height: 280px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-detail-visual svg {
    width: 80px;
    height: 80px;
    color: var(--color-primary);
}

.code-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.code-grid-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 28px;
    text-align: center;
    transition: all var(--transition);
}

.code-grid-card:hover {
    border-color: var(--color-primary-light);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.code-grid-card .code-number {
    margin: 0 auto 12px;
}

.code-grid-card h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 6px;
}

.code-grid-card p {
    font-size: 13px;
    color: var(--color-text-muted);
}

.about-hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    margin-bottom: 80px;
}

.about-hero-content h2 {
    font-size: 28px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 16px;
}

.about-hero-content p {
    font-size: 15px;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 16px;
}

.about-hero-visual {
    background: linear-gradient(135deg, var(--color-primary-bg) 0%, var(--color-bg-tertiary) 100%);
    border-radius: var(--radius-xl);
    padding: 48px;
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.timeline {
    max-width: 600px;
    margin: 0 auto;
}

.timeline-item {
    display: flex;
    gap: 24px;
    padding-bottom: 32px;
    position: relative;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: 11px;
    top: 28px;
    bottom: 0;
    width: 2px;
    background: var(--color-border);
}

.timeline-item:last-child::before {
    display: none;
}

.timeline-dot {
    width: 24px;
    height: 24px;
    background: var(--color-primary);
    border-radius: 50%;
    flex-shrink: 0;
    position: relative;
    z-index: 1;
}

.timeline-content {
    flex: 1;
    padding-top: 2px;
}

.timeline-date {
    font-size: 13px;
    font-weight: 500;
    color: var(--color-primary);
    margin-bottom: 4px;
}

.timeline-content h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 8px;
}

.timeline-content p {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

@media (max-width: 1024px) {
    .hero-section .container {
        grid-template-columns: 1fr;
        gap: 48px;
        text-align: center;
    }
    
    .hero-content {
        max-width: 100%;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .hero-visual {
        display: none;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .feature-card-large {
        grid-column: span 2;
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .feature-card-large .feature-icon {
        margin: 0 auto 20px;
    }
    
    .code-wrapper,
    .qa-wrapper {
        grid-template-columns: 1fr;
        gap: 48px;
    }
    
    .code-content,
    .qa-content {
        text-align: center;
    }
    
    .code-content .section-title,
    .qa-content .section-title {
        text-align: center;
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }
    
    .feature-detail {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .feature-detail:nth-child(even) {
        direction: ltr;
    }
    
    .about-hero {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .code-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --nav-height: 64px;
    }
    
    .nav {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: var(--color-bg);
        flex-direction: column;
        gap: 0;
        padding: 16px;
        border-bottom: 1px solid var(--color-border);
        display: none;
        box-shadow: var(--shadow-lg);
    }
    
    .nav.active {
        display: flex;
    }
    
    .nav a {
        padding: 12px 16px;
        border-radius: var(--radius-md);
        width: 100%;
        text-align: left;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .hero-stats {
        gap: 24px;
    }
    
    .hero-stat-value {
        font-size: 24px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .section-header {
        margin-bottom: 40px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .feature-card-large {
        grid-column: span 1;
        padding: 28px;
    }
    
    .download-title {
        font-size: 32px;
    }
    
    .download-section .container {
        padding: 80px 24px;
    }
    
    .why-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .page-header {
        padding: calc(var(--nav-height) + 40px) 0 40px;
    }
    
    .page-header h1 {
        font-size: 28px;
    }
    
    .content-card {
        padding: 24px;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .code-grid {
        grid-template-columns: 1fr;
    }
    
    .qa-categories {
        justify-content: center;
    }
    
    .qa-preview {
        padding: 24px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 20px;
    }
    
    .hero-title {
        font-size: 28px;
    }
    
    .hero-stats {
        flex-wrap: wrap;
        gap: 16px;
    }
    
    .hero-stat {
        width: calc(50% - 8px);
        text-align: center;
    }
    
    .btn {
        padding: 12px 24px;
        font-size: 14px;
    }
    
    .btn-lg {
        padding: 14px 28px;
    }
    
    .download-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .download-actions .btn {
        width: 100%;
        max-width: 280px;
    }
    
    .download-features {
        flex-direction: column;
        gap: 12px;
    }
}