@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+TC:wght@300;400;500;700&display=swap');

:root {
    --primary: #456dff;
    --secondary: #9ddcfb;
    --accent: #6b89ff;
    --light: #f8f9fa;
    --dark: #343a40;
    --white: #ffffff;
    --gray-100: #f8f9fa;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --gray-400: #ced4da;
    --gray-500: #adb5bd;
    --gray-600: #6c757d;
    --gray-700: #495057;
    --gray-800: #343a40;
    --gray-900: #212529;
    
    --gradient-primary: linear-gradient(135deg, var(--primary), var(--secondary));
    --gradient-secondary: linear-gradient(135deg, var(--accent), var(--primary));
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 8px rgba(0,0,0,0.12), 0 2px 4px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 16px rgba(0,0,0,0.15), 0 4px 8px rgba(0,0,0,0.1);
    --shadow-xl: 0 12px 24px rgba(0,0,0,0.15), 0 8px 16px rgba(0,0,0,0.1);
    
    --border-radius: 8px;
    --border-radius-lg: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--white);
    color: var(--gray-800);
    line-height: 1.6;
    overflow-x: hidden;
}

html {
    scroll-behavior: smooth;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo {
    display: flex;
    align-items: center;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--primary);
    text-decoration: none;
}

.nav-logo-img {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    margin-right: 0.75rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    color: var(--gray-700);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--gray-700);
    margin: 3px 0;
    transition: var(--transition);
    border-radius: 2px;
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
    padding-top: 70px;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-primary);
    opacity: 0.05;
    z-index: -1;
}

.hero-content {
    max-width: 800px;
    z-index: 2;
}

.logo-container {
    margin-bottom: 2rem;
}

.hero-logo {
    width: 120px;
    height: 120px;
    border-radius: 24px;
    box-shadow: var(--shadow-lg);
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 1rem;
    animation: fadeInUp 1s ease-out;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--gray-600);
    margin-bottom: 1.5rem;
    animation: fadeInUp 1s ease-out 0.2s both;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--gray-700);
    margin-bottom: 3rem;
    animation: fadeInUp 1s ease-out 0.4s both;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    animation: fadeInUp 1s ease-out 0.6s both;
}

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

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.scroll-arrow {
    width: 24px;
    height: 24px;
    border: 2px solid var(--primary);
    border-left: none;
    border-top: none;
    transform: rotate(45deg);
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

/* Buttons */
.cta-button {
    display: inline-flex;
    align-items: center;
    padding: 0.875rem 2rem;
    border-radius: var(--border-radius-lg);
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    font-size: 1rem;
    border: none;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.cta-button.primary {
    background: var(--gradient-primary);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.cta-button.secondary {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

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

.cta-button.primary:hover {
    box-shadow: var(--shadow-xl);
}

.cta-button.secondary:hover {
    background: var(--primary);
    color: var(--white);
}

/* Sections */
.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 1rem;
    color: var(--gray-800);
    position: relative;
}

.section-title.white {
    color: var(--white);
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--gradient-primary);
    margin: 1.5rem auto;
    border-radius: 2px;
}

.section-subtitle {
    text-align: center;
    font-size: 1.2rem;
    color: var(--gray-600);
    margin-bottom: 4rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.section-subtitle.white {
    color: rgba(255, 255, 255, 0.9);
}

/* Features Section */
.features {
    padding: 6rem 0;
    background: var(--white);
}

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

.feature-card {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    padding: 2.5rem;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 1px solid var(--gray-200);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

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

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    display: block;
}

.feature-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--gray-800);
}

.feature-description {
    color: var(--gray-600);
    margin-bottom: 1.5rem;
    font-size: 1rem;
}

.feature-list {
    list-style: none;
    color: var(--gray-700);
}

.feature-list li {
    margin-bottom: 0.75rem;
    padding-left: 1.5rem;
    position: relative;
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: 700;
}

/* Version Preview Section */
.version-preview {
    padding: 6rem 0;
    background: var(--white);
}

.version-preview-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
    align-items: start;
}

.current-version-card {
    background: var(--gray-100);
    border-radius: var(--border-radius-lg);
    padding: 2.5rem;
    position: relative;
    border: 2px solid transparent;
    transition: var(--transition);
}

.current-version-card:hover {
    border-color: var(--primary);
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.version-badge {
    display: inline-block;
    background: var(--gradient-primary);
    color: var(--white);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.current-version-card h3 {
    font-size: 2rem;
    color: var(--gray-800);
    margin-bottom: 1rem;
}

.current-version-card p {
    color: var(--gray-700);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.version-highlights {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 2rem;
}

.highlight {
    background: var(--white);
    color: var(--gray-800);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    font-weight: 500;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.highlight:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.version-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.download-current-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--gradient-primary);
    color: var(--white);
    padding: 1rem 2rem;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

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

.view-all-btn {
    display: inline-flex;
    align-items: center;
    background: transparent;
    color: var(--primary);
    padding: 1rem 2rem;
    border: 2px solid var(--primary);
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

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

.version-stats {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.version-stat {
    background: var(--gray-100);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    text-align: center;
    transition: var(--transition);
    border: 2px solid transparent;
}

.version-stat:hover {
    border-color: var(--primary);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.version-stat .stat-number {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.version-stat .stat-label {
    color: var(--gray-600);
    font-size: 0.875rem;
}

/* Download Section */
.download-section {
    padding: 6rem 0;
    background: var(--gradient-primary);
    color: var(--white);
}

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

.current-version {
    margin-bottom: 2rem;
}

.version-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 1rem;
}

.current-version h3 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

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

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

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.875rem;
    opacity: 0.9;
}

.download-button-container {
    text-align: center;
}

.download-button {
    display: inline-flex;
    align-items: center;
    background: var(--white);
    color: var(--primary);
    padding: 1.5rem 2.5rem;
    border-radius: var(--border-radius-lg);
    text-decoration: none;
    font-weight: 600;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
    margin-bottom: 1rem;
}

.download-button:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

.download-icon {
    font-size: 2rem;
    margin-right: 1rem;
}

.download-text {
    display: flex;
    flex-direction: column;
}

.download-title {
    font-size: 1.2rem;
    margin-bottom: 0.25rem;
}

.download-subtitle {
    font-size: 0.875rem;
    opacity: 0.7;
}

.download-note {
    font-size: 0.875rem;
    opacity: 0.8;
    margin-top: 1rem;
}

/* Changelog Section */
.changelog-section {
    padding: 6rem 0;
    background: var(--gray-100);
}

.changelog-container {
    max-width: 900px;
    margin: 0 auto;
}

.version-tabs {
    display: flex;
    justify-content: center;
    margin-bottom: 3rem;
    background: var(--white);
    border-radius: var(--border-radius-lg);
    padding: 0.5rem;
    box-shadow: var(--shadow-sm);
}

.version-tab {
    flex: 1;
    padding: 1rem 2rem;
    background: transparent;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    color: var(--gray-600);
}

.version-tab.active,
.version-tab:hover {
    background: var(--primary);
    color: var(--white);
}

.version-content {
    position: relative;
}

.version-panel {
    display: none;
    background: var(--white);
    border-radius: var(--border-radius-lg);
    padding: 2.5rem;
    box-shadow: var(--shadow-md);
    animation: fadeIn 0.5s ease-out;
}

.version-panel.active {
    display: block;
}

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

.version-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 2px solid var(--gray-200);
}

.version-header h3 {
    font-size: 1.5rem;
    color: var(--gray-800);
}

.version-date {
    color: var(--gray-600);
    font-size: 0.875rem;
}

.version-status {
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.version-status.latest {
    background: #e7f5e7;
    color: #2d7a2d;
}

.version-status.first {
    background: #e7f0ff;
    color: #1a56a3;
}

.changelog-content {
    margin-bottom: 2rem;
}

.changelog-section {
    margin-bottom: 2rem;
}

.changelog-section h4 {
    color: var(--gray-800);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.changelog-section ul {
    list-style: none;
    color: var(--gray-700);
}

.changelog-section li {
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
}

.changelog-section li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: 700;
}

.download-version {
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid var(--gray-200);
}

.version-download-btn {
    display: inline-block;
    background: var(--gradient-primary);
    color: var(--white);
    padding: 0.75rem 2rem;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.version-download-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Future Plans */
.future-plans {
    padding: 6rem 0;
    background: var(--white);
}

.future-content {
    max-width: 1000px;
    margin: 0 auto;
}

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

.roadmap-item {
    background: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    text-align: center;
    transition: var(--transition);
}

.roadmap-item:hover {
    border-color: var(--primary);
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.roadmap-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.roadmap-item h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--gray-800);
}

.roadmap-item ul {
    list-style: none;
    text-align: left;
    color: var(--gray-700);
}

.roadmap-item li {
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
}

.roadmap-item li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--primary);
}

.community-section {
    text-align: center;
    padding: 3rem;
    background: var(--gray-100);
    border-radius: var(--border-radius-lg);
}

.community-section h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: var(--gray-800);
}

.community-section p {
    margin-bottom: 2rem;
    color: var(--gray-600);
}

.community-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* Contact Section */
.contact-section {
    padding: 6rem 0;
    background: var(--gradient-secondary);
    color: var(--white);
}

.contact-content {
    max-width: 800px;
    margin: 0 auto;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.contact-item {
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.1);
    padding: 2rem;
    border-radius: var(--border-radius-lg);
    backdrop-filter: blur(10px);
    transition: var(--transition);
}

.contact-item:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-5px);
}

.contact-icon {
    font-size: 2rem;
    margin-right: 1rem;
}

.contact-details h3 {
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.contact-details a {
    color: var(--white);
    text-decoration: none;
    opacity: 0.9;
    transition: var(--transition);
}

.contact-details a:hover {
    opacity: 1;
}

/* Footer */
.footer {
    background: var(--gray-900);
    color: var(--white);
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    margin-bottom: 1rem;
    color: var(--white);
}

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

.footer-logo img {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    margin-right: 0.75rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: var(--gray-400);
    text-decoration: none;
    transition: var(--transition);
}

.footer-section a:hover {
    color: var(--white);
}

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

.social-links a {
    display: inline-block;
    padding: 0.5rem;
    background: var(--gray-800);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--primary);
    transform: translateY(-2px);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--gray-800);
    color: var(--gray-500);
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 1000;
}

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

.back-to-top:hover {
    background: var(--accent);
    transform: translateY(-3px);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--white);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow-md);
        padding: 2rem 0;
        gap: 1rem;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active span:nth-child(1) {
        transform: translateY(9px) rotate(45deg);
    }
    
    .hamburger.active span:nth-child(3) {
        transform: translateY(-9px) rotate(-45deg);
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .download-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .version-tabs {
        flex-direction: column;
    }
    
    .roadmap {
        grid-template-columns: 1fr;
    }
    
    .contact-info {
        grid-template-columns: 1fr;
    }
    
    .community-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .version-preview-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .version-stats {
        flex-direction: row;
        gap: 1rem;
    }
    
    .version-stat {
        flex: 1;
        padding: 1rem;
    }
    
    .version-actions {
        flex-direction: column;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .feature-card,
    .roadmap-item {
        padding: 1.5rem;
    }
}

/* Changelog Page Styles */
.page-header {
    background: var(--gradient-primary);
    color: var(--white);
    padding: 8rem 0 4rem;
    text-align: center;
    margin-top: 70px;
}

.page-header-content h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.page-header-content p {
    font-size: 1.2rem;
    opacity: 0.9;
    margin-bottom: 2rem;
}

.breadcrumb {
    display: inline-flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.1);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    backdrop-filter: blur(10px);
}

.breadcrumb a {
    color: var(--white);
    text-decoration: none;
    opacity: 0.8;
    transition: var(--transition);
}

.breadcrumb a:hover {
    opacity: 1;
}

.breadcrumb span {
    margin: 0 0.5rem;
    opacity: 0.6;
}

.changelog-page {
    padding: 4rem 0;
    background: var(--gray-100);
}

.version-overview {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
    margin-bottom: 4rem;
}

.overview-card {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.overview-card.current::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
}

.overview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.overview-header h3 {
    color: var(--gray-800);
    font-size: 1.2rem;
}

.version-number {
    background: var(--gradient-primary);
    color: var(--white);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.9rem;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--primary);
    color: var(--white);
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    margin-top: 1rem;
    transition: var(--transition);
}

.download-btn:hover {
    background: var(--accent);
    transform: translateY(-2px);
}

.overview-stats {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.stat {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.stat:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.stat-number {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--gray-600);
    font-size: 0.9rem;
}

.version-timeline {
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
}

.version-timeline::before {
    content: '';
    position: absolute;
    left: 30px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--gray-300);
}

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
    padding-left: 80px;
}

.timeline-marker {
    position: absolute;
    left: 0;
    top: 0;
    width: 60px;
    height: 60px;
    background: var(--white);
    border: 3px solid var(--gray-300);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
}

.timeline-item.current-version .timeline-marker {
    border-color: var(--primary);
    background: var(--primary);
}

.timeline-item.first-version .timeline-marker {
    border-color: var(--accent);
}

.timeline-icon {
    font-size: 1.5rem;
}

.current-version .timeline-icon {
    color: var(--white);
}

.version-card {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    position: relative;
}

.version-card:hover {
    box-shadow: var(--shadow-lg);
}

.current-version .version-card {
    border-left: 4px solid var(--primary);
}

.version-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1.5rem;
    gap: 1rem;
}

.version-info h3 {
    font-size: 1.5rem;
    color: var(--gray-800);
    margin-bottom: 0.5rem;
}

.version-date {
    color: var(--gray-600);
    font-size: 0.9rem;
}

.version-badges {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.badge {
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge.latest {
    background: #e7f5e7;
    color: #2d7a2d;
}

.badge.recommended {
    background: #fff3cd;
    color: #856404;
}

.badge.stable {
    background: #e7f0ff;
    color: #1a56a3;
}

.badge.first {
    background: #f8e7ff;
    color: #7b2cbf;
}

.download-version-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--gradient-primary);
    color: var(--white);
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    white-space: nowrap;
}

.download-version-btn.secondary {
    background: var(--gray-600);
}

.download-version-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.version-summary {
    background: var(--gray-100);
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius);
    margin-bottom: 1.5rem;
}

.version-summary p {
    color: var(--gray-700);
    font-style: italic;
}

.changelog-details {
    margin-bottom: 1.5rem;
}

.changelog-category {
    margin-bottom: 2rem;
}

.changelog-category h4 {
    color: var(--gray-800);
    margin-bottom: 1rem;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.changelog-category ul {
    list-style: none;
    color: var(--gray-700);
}

.changelog-category li {
    margin-bottom: 0.75rem;
    padding-left: 1.5rem;
    position: relative;
    line-height: 1.5;
}

.changelog-category li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: 700;
}

.changelog-category li strong {
    color: var(--gray-800);
}

.version-tech-notes {
    background: #f8f9ff;
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius);
    border-left: 4px solid var(--accent);
}

.version-tech-notes h5 {
    color: var(--gray-800);
    margin-bottom: 0.75rem;
    font-size: 1rem;
}

.version-tech-notes ul {
    list-style: none;
}

.version-tech-notes li {
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
    color: var(--gray-700);
    font-size: 0.9rem;
}

.version-tech-notes li::before {
    content: '▶';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-size: 0.8rem;
}

.future-preview {
    margin-top: 4rem;
    padding: 3rem;
    background: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
}

.future-header {
    text-align: center;
    margin-bottom: 3rem;
}

.future-header h2 {
    color: var(--gray-800);
    margin-bottom: 1rem;
}

.future-header p {
    color: var(--gray-600);
}

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

.future-version {
    background: var(--gray-100);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    text-align: center;
    transition: var(--transition);
    border: 2px solid transparent;
}

.future-version:hover {
    border-color: var(--primary);
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.future-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.future-version h3 {
    color: var(--gray-800);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.coming-soon {
    background: #fff3cd;
    color: #856404;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.planned {
    background: #e7f0ff;
    color: #1a56a3;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.future-version ul {
    list-style: none;
    text-align: left;
}

.future-version li {
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
    color: var(--gray-700);
}

.future-version li::before {
    content: '◦';
    position: absolute;
    left: 0;
    color: var(--primary);
}

/* Responsive for changelog page */
@media (max-width: 768px) {
    .page-header {
        padding: 6rem 0 3rem;
    }
    
    .page-header-content h1 {
        font-size: 2rem;
    }
    
    .version-overview {
        grid-template-columns: 1fr;
    }
    
    .overview-stats {
        flex-direction: row;
        justify-content: space-between;
    }
    
    .stat {
        flex: 1;
        padding: 1rem;
    }
    
    .timeline-item {
        padding-left: 60px;
    }
    
    .timeline-marker {
        width: 50px;
        height: 50px;
    }
    
    .version-header {
        flex-direction: column;
        align-items: stretch;
        gap: 1rem;
    }
    
    .version-actions {
        align-self: flex-start;
    }
    
    .future-versions {
        grid-template-columns: 1fr;
    }
}

/* Loading Animation */
@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.pulse {
    animation: pulse 2s infinite;
}