/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fafafa;
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 1rem;
}

p {
    margin-bottom: 1rem;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Gradient Text */
.gradient-text {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-size: 200% 200%;
    animation: gradientShift 3s ease-in-out infinite;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
    background: none;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.9);
    color: #333;
    border: 2px solid #e2e8f0;
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: white;
    border-color: #667eea;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 600;
    color: #333;
}

.logo-icon {
    width: 32px;
    height: 32px;
    border-radius: 6px;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    font-weight: 500;
    color: #666;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: #667eea;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.bar {
    width: 25px;
    height: 3px;
    background: #333;
    border-radius: 3px;
    transition: all 0.3s ease;
}

/* Hero Section */
.hero {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, #f5f7ff 0%, #e8f2ff 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="0.5" fill="%23667eea" opacity="0.1"/><circle cx="75" cy="25" r="0.3" fill="%23764ba2" opacity="0.1"/><circle cx="25" cy="75" r="0.4" fill="%23667eea" opacity="0.1"/><circle cx="75" cy="75" r="0.6" fill="%23764ba2" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    pointer-events: none;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(102, 126, 234, 0.1);
    color: #667eea;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(102, 126, 234, 0.2);
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    color: #1a202c;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: #64748b;
    margin-bottom: 2.5rem;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 3rem;
}

.hero-stats {
    display: flex;
    gap: 2rem;
}

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

.stat-number {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: #1a202c;
}

.stat-label {
    font-size: 0.9rem;
    color: #64748b;
}

/* Hero Image */
.hero-image {
    position: relative;
    z-index: 2;
}

.app-preview {
    position: relative;
    transform: perspective(1000px) rotateY(-15deg) rotateX(10deg);
    transition: transform 0.3s ease;
}

.app-preview:hover {
    transform: perspective(1000px) rotateY(-10deg) rotateX(5deg);
}

.app-window {
    background: white;
    border-radius: 12px;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15);
    overflow: hidden;
    border: 1px solid #e2e8f0;
}

.window-header {
    background: #f8fafc;
    padding: 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    border-bottom: 1px solid #e2e8f0;
}

.window-controls {
    display: flex;
    gap: 0.5rem;
}

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

.control.close { background: #ff5f57; }
.control.minimize { background: #ffbd2e; }
.control.maximize { background: #28ca42; }

.window-title {
    font-weight: 500;
    color: #64748b;
    font-size: 0.9rem;
}

.window-content {
    height: 400px;
    overflow: hidden;
}

.editor-preview {
    display: flex;
    height: 100%;
}

.sidebar-preview {
    width: 200px;
    background: #f8fafc;
    border-right: 1px solid #e2e8f0;
    padding: 1rem;
}

.project-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem;
    border-radius: 6px;
    margin-bottom: 1rem;
    font-weight: 500;
    background: #667eea;
    color: white;
}

.chapter-item {
    padding: 0.5rem;
    border-radius: 4px;
    margin-bottom: 0.5rem;
    color: #64748b;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.chapter-item:hover {
    background: #e2e8f0;
    color: #333;
}

.editor-area {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.editor-toolbar {
    display: flex;
    gap: 0.5rem;
    padding: 1rem;
    border-bottom: 1px solid #e2e8f0;
}

.toolbar-btn {
    padding: 0.5rem;
    border: none;
    background: none;
    border-radius: 4px;
    cursor: pointer;
    color: #64748b;
    transition: all 0.2s ease;
}

.toolbar-btn:hover {
    background: #f1f5f9;
    color: #333;
}

.ai-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    font-weight: 500;
}

.ai-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.editor-text {
    padding: 1.5rem;
    flex: 1;
    font-family: 'Inter', sans-serif;
    line-height: 1.8;
}

.editor-text p {
    margin-bottom: 1rem;
    color: #333;
}

.typing-animation {
    color: #667eea;
}

.cursor {
    animation: blink 1s infinite;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

/* Section Styles */
.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1a202c;
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.25rem;
    color: #64748b;
    max-width: 600px;
    margin: 0 auto;
}

/* Features Section */
.features {
    padding: 80px 0;
    background: white;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    border: 1px solid #f1f5f9;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
    color: white;
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: #1a202c;
    margin-bottom: 1rem;
}

.feature-description {
    color: #64748b;
    line-height: 1.6;
}

/* Requirements Section */
.requirements {
    padding: 80px 0;
    background: #f8fafc;
}

.requirements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.requirement-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    border: 1px solid #e2e8f0;
    transition: all 0.3s ease;
}

.requirement-card.highlight {
    border: 2px solid #667eea;
    position: relative;
}

.requirement-card.highlight::before {
    content: '推荐';
    position: absolute;
    top: -10px;
    right: 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 500;
}

.requirement-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
}

.requirement-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    font-size: 1.25rem;
    color: white;
}

.requirement-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: #1a202c;
    margin-bottom: 1rem;
}

.requirement-list {
    list-style: none;
    margin-bottom: 1rem;
}

.requirement-list li {
    padding: 0.5rem 0;
    color: #64748b;
    border-bottom: 1px solid #f1f5f9;
}

.requirement-list li:last-child {
    border-bottom: none;
}

.requirement-list strong {
    color: #1a202c;
}

.requirement-note {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem;
    background: #f0f9ff;
    border: 1px solid #bae6fd;
    border-radius: 8px;
    color: #0369a1;
    font-size: 0.9rem;
    margin-top: 1rem;
}

/* Download Section */
.download {
    padding: 80px 0;
    background: white;
}

.download-cards {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.download-card {
    background: white;
    border: 2px solid #e2e8f0;
    border-radius: 16px;
    padding: 2rem;
    transition: all 0.3s ease;
    position: relative;
    max-width: 400px;
    width: 100%;
    flex: 1;
    min-width: 350px;
}

.download-card.featured {
    border-color: #667eea;
    background: linear-gradient(135deg, #f5f7ff 0%, #e8f2ff 100%);
    position: relative;
}

.download-card.featured::before {
    content: '推荐';
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 500;
}

.download-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.1);
}

.download-header {
    text-align: center;
    margin-bottom: 2rem;
}

.download-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    font-size: 1.5rem;
    color: white;
}

.download-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: #1a202c;
    margin-bottom: 0.5rem;
}

.download-subtitle {
    color: #64748b;
}

.download-features {
    margin-bottom: 2rem;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 0;
    color: #64748b;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

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

.feature-item i {
    color: #10b981;
    font-size: 0.9rem;
}

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

.download-note {
    margin-top: 1rem;
    font-size: 0.9rem;
    color: #64748b;
}

.download-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 4rem;
}

.info-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    background: #f8fafc;
    border-radius: 12px;
    border: 1px solid #e2e8f0;
}

.info-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.info-content h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: #1a202c;
    margin-bottom: 0.5rem;
}

.info-content p {
    color: #64748b;
    font-size: 0.9rem;
    margin: 0;
}

/* About Section */
.about {
    padding: 80px 0;
    background: #f8fafc;
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-description {
    color: #64748b;
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.about-features {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 2rem;
}

.about-feature {
    display: flex;
    align-items: center;
    gap: 1rem;
    color: #64748b;
}

.about-feature i {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1rem;
    flex-shrink: 0;
}

.about-stats {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.stat-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    border: 1px solid #e2e8f0;
    display: flex;
    align-items: center;
    gap: 1.5rem;
    transition: all 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
}

.stat-card .stat-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.stat-info {
    display: flex;
    flex-direction: column;
}

.stat-card .stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: #1a202c;
    line-height: 1;
}

.stat-card .stat-label {
    color: #64748b;
    font-size: 0.9rem;
}

/* Footer */
.footer {
    background: #1a202c;
    color: white;
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.footer-logo-icon {
    width: 32px;
    height: 32px;
    border-radius: 6px;
}

.footer-logo-text {
    font-size: 1.25rem;
    font-weight: 600;
}

.footer-description {
    color: #a0aec0;
    margin-bottom: 2rem;
    line-height: 1.6;
}

.footer-social {
    display: flex;
    gap: 1rem;
}

.social-link {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #a0aec0;
    transition: all 0.3s ease;
}

.social-link:hover {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    transform: translateY(-2px);
}

.footer-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: white;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: #a0aec0;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: white;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-copyright p {
    color: #a0aec0;
    margin: 0;
}

.footer-links-bottom {
    display: flex;
    gap: 2rem;
}

.footer-links-bottom a {
    color: #a0aec0;
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

.footer-links-bottom a:hover {
    color: white;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    backdrop-filter: blur(10px);
}

.modal-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: white;
    border-radius: 16px;
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.2);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 2rem 2rem 1rem;
    border-bottom: 1px solid #e2e8f0;
}

.modal-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: #1a202c;
    margin: 0;
}

.modal-close {
    width: 40px;
    height: 40px;
    border: none;
    background: #f8fafc;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: #64748b;
    transition: all 0.3s ease;
}

.modal-close:hover {
    background: #e2e8f0;
    color: #333;
}

.modal-body {
    padding: 2rem;
}

.modal-description {
    color: #64748b;
    margin-bottom: 2rem;
}

.download-sources {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.download-source {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    transition: all 0.3s ease;
    cursor: pointer;
}

.download-source:hover {
    border-color: #667eea;
    background: #f5f7ff;
}

.download-source .source-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.source-info {
    flex: 1;
}

.source-info h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: #1a202c;
    margin-bottom: 0.25rem;
}

.source-info p {
    color: #64748b;
    font-size: 0.9rem;
    margin: 0;
}

.source-action {
    color: #64748b;
    font-size: 1rem;
}

/* Back to Top */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

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

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

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }
    
    .nav-container {
        padding: 0 1rem;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(20px);
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        padding-top: 2rem;
        gap: 2rem;
        transition: left 0.3s ease;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-toggle.active .bar:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active .bar:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-stats {
        justify-content: center;
        flex-wrap: wrap;
        gap: 1rem;
    }
    
    .app-preview {
        transform: none;
        max-width: 100%;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .requirements-grid {
        grid-template-columns: 1fr;
    }
    
    .download-cards {
        justify-content: center;
        flex-direction: column;
        align-items: center;
    }
    
    .download-card {
        max-width: 100%;
        min-width: unset;
    }
    
    .macos-download-options {
        gap: 0.5rem;
    }
    
    .macos-download-options .btn {
        font-size: 0.9rem;
        padding: 0.75rem 1rem;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .modal-content {
        width: 95%;
        margin: 1rem;
    }
    
    .modal-header,
    .modal-body {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .btn {
        padding: 0.75rem 1rem;
        font-size: 0.9rem;
    }
    
    .btn-large {
        padding: 1rem 1.5rem;
        font-size: 1rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .section-subtitle {
        font-size: 1rem;
    }
}

/* macOS Download Card Styles */
.macos-download-options {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.macos-download-options .btn {
    width: 100%;
}

.btn-secondary {
    background: #e2e8f0;
    color: #475569;
    border: 2px solid #e2e8f0;
}

.btn-secondary:hover {
    background: #cbd5e1;
    border-color: #cbd5e1;
    transform: translateY(-2px);
}

/* Recommended platform highlighting */
.download-card.auto-recommended {
    border-color: #10b981;
    background: linear-gradient(135deg, #f0fdf4 0%, #ecfdf5 100%);
}

.download-card.auto-recommended::before {
    content: '推荐给您';
    position: absolute;
    top: -10px;
    right: 20px;
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 500;
}