:root {
    --color-primary: #667eea;
    --color-primary-dark: #5a6fd6;
    --color-secondary: #764ba2;
    --color-success: #48bb78;
    --color-warning: #ed8936;
    --color-danger: #f56565;
    --color-text: #2d3748;
    --color-text-light: #718096;
    --color-text-muted: #a0aec0;
    --color-bg: #ffffff;
    --color-bg-alt: #f7fafc;
    --color-bg-dark: #1a202c;
    --color-border: #e2e8f0;
    --color-border-light: #edf2f7;
    
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-md: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 24px;
    --font-size-2xl: 32px;
    --font-size-3xl: 48px;
    
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    
    --border-radius: 8px;
    --border-radius-lg: 16px;
    --border-radius-xl: 24px;
    
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.12);
    
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif;
    font-size: var(--font-size-md);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-xl);
    font-weight: 700;
}

.logo-icon {
    color: var(--color-primary);
    font-size: 28px;
}

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

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

.nav-link {
    font-weight: 500;
    color: var(--color-text-light);
    transition: color var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-primary);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    font-size: var(--font-size-md);
    font-weight: 600;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 2px solid transparent;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    border-color: var(--color-primary);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

.btn-large {
    padding: 16px 32px;
    font-size: var(--font-size-lg);
}

.hero {
    padding: 60px 0 80px;
    background: linear-gradient(180deg, var(--color-bg-alt) 0%, var(--color-bg) 100%);
}

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

.hero-title {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-2xl);
}

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

.stat-number {
    display: block;
    font-size: var(--font-size-2xl);
    font-weight: 800;
    color: var(--color-primary);
}

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

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

.hero-card {
    background: white;
    padding: var(--spacing-xl) var(--spacing-2xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    text-align: center;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.hero-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.hero-card-icon {
    font-size: 36px;
    margin-bottom: var(--spacing-sm);
}

.hero-card-text {
    font-weight: 600;
    color: var(--color-text);
}

.carousel-section {
    padding: var(--spacing-xl) 0 var(--spacing-2xl);
    background: var(--color-bg-alt);
}

.carousel-container {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    background: white;
}

.carousel-viewport {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
}

.carousel-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.5s ease-in-out;
    display: flex;
    align-items: center;
    justify-content: center;
}

.carousel-slide.active {
    opacity: 1;
    z-index: 1;
}

.carousel-image {
    width: 100%;
    height: 100%;
    object-fit: contain;
    background: #f8f9fa;
}

.carousel-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--spacing-md);
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
    color: white;
    font-size: var(--font-size-lg);
    font-weight: 600;
    text-align: center;
}

.carousel-indicators {
    display: flex;
    justify-content: center;
    gap: 8px;
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.95);
}

.carousel-indicator {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--color-border);
    cursor: pointer;
    transition: all 0.3s ease;
}

.carousel-indicator.active {
    background: var(--color-primary);
    transform: scale(1.2);
}

.carousel-indicator:hover {
    background: var(--color-primary);
    opacity: 0.8;
}

.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 44px;
    height: 44px;
    background: rgba(0, 0, 0, 0.5);
    border: none;
    border-radius: 50%;
    color: white;
    font-size: 24px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: center;
}

.carousel-btn:hover {
    background: rgba(0, 0, 0, 0.7);
    transform: translateY(-50%) scale(1.1);
}

.carousel-btn-prev {
    left: 16px;
}

.carousel-btn-next {
    right: 16px;
}

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

.section-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.section-title2 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: white;
}

.cta-content .section-title {
    color: white;
}

.section-desc {
    font-size: var(--font-size-md);
    color: var(--color-text-light);
}

.improvements {
    padding: var(--spacing-2xl) 0;
    background: var(--color-bg-alt);
}

.improvements-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
}

.improvement-card {
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.improvement-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.improvement-header {
    display: flex;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background: linear-gradient(135deg, #f0f4ff, #e8ecf6);
    color: var(--color-text);
}

.improvement-number {
    width: 36px;
    height: 36px;
    background: var(--color-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: var(--font-size-md);
    margin-right: var(--spacing-md);
    flex-shrink: 0;
}

.improvement-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
}

.improvement-body {
    padding: var(--spacing-lg);
}

.improvement-row {
    display: flex;
    margin-bottom: var(--spacing-md);
}

.improvement-row:last-child {
    margin-bottom: 0;
}

.improvement-label {
    flex-shrink: 0;
    width: 80px;
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-sm);
    font-weight: 600;
    border-radius: var(--border-radius);
    text-align: center;
}

.improvement-label.old {
    background: #fed7d7;
    color: #c53030;
}

.improvement-label.new {
    background: #c6f6d5;
    color: #276749;
}

.improvement-text {
    padding-left: var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    line-height: 1.8;
}

.features {
    padding: var(--spacing-2xl) 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

.feature-card {
    text-align: center;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    background: var(--color-bg-alt);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-md);
}

.feature-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.feature-desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}

.cta {
    padding: var(--spacing-2xl) 0;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
}

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

.cta-desc {
    font-size: var(--font-size-md);
    margin-bottom: var(--spacing-xl);
    opacity: 0.9;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
}

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

.cta .btn-outline {
    background: transparent;
    color: white;
    border-color: white;
}

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

.qrcode-section {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.qrcode-tip {
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-md);
    opacity: 0.9;
}

.qrcode-wrapper {
    display: inline-block;
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--spacing-lg);
}

.qrcode-image {
    width: 160px;
    height: 160px;
    display: block;
}

.copy-url-section {
    margin-top: var(--spacing-lg);
}

.copy-url-btn {
    padding: var(--spacing-sm) var(--spacing-xl);
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: var(--border-radius);
    color: white;
    font-size: var(--font-size-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.copy-url-btn:hover {
    background: white;
    color: var(--color-primary);
    border-color: white;
}

.copy-url-btn.copied {
    background: var(--color-success);
    border-color: var(--color-success);
    color: white;
}

.footer {
    background: var(--color-bg-dark);
    color: white;
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-xl);
}

.footer-brand {
    max-width: 300px;
}

.footer-brand .logo {
    margin-bottom: var(--spacing-md);
}

.footer-brand .logo-text {
    color: white;
    background: none;
    -webkit-text-fill-color: white;
}

.footer-desc {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
}

.footer-links {
    display: flex;
    gap: var(--spacing-2xl);
}

.footer-column {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-title {
    font-size: var(--font-size-md);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.footer-link {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: white;
}

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

.copyright {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.5);
}