/* CSS Variables */
:root {
    --primary-color: #3b82f6;
    --primary-dark: #2563eb;
    --accent-color: #8b5cf6;
    --gradient-primary: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    --bg-color: #f4f6f9;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 40px -10px rgba(0, 0, 0, 0.15);
    --radius-lg: 20px;
    --radius-xl: 40px;
    --transition: all 0.2s ease;
}

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

body {
    font-family: 'Inter', system-ui, sans-serif;
    background: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(59, 130, 246, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(139, 92, 246, 0.05) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    position: relative;
    z-index: 1;
}

/* Header */
.header {
    padding: 24px 0;
    margin-bottom: 60px;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

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

.nav {
    display: flex;
    gap: 32px;
}

.nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

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

/* Hero */
.hero {
    text-align: center;
    margin-bottom: 60px;
}

.hero h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 16px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 20px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Version Bar */
.version-bar {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 24px;
    flex-wrap: wrap;
    padding: 20px 32px;
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: 48px;
}

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

.version-item i {
    color: var(--primary-color);
}

.version-item strong {
    color: var(--text-primary);
    font-weight: 600;
}

.badge-latest {
    background: var(--gradient-primary);
    color: white;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

/* Platform Cards */
.platforms-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 60px;
}

.platform-card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.platform-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.platform-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.platform-windows .platform-icon { color: #0078d4; }
.platform-macos .platform-icon { color: #000000; }
.platform-linux .platform-icon { color: #fcc624; }

.platform-name {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 12px;
}

.platform-version, .platform-size {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--gradient-primary);
    color: white;
    padding: 12px 24px;
    border-radius: var(--radius-xl);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    width: 100%;
    justify-content: center;
    margin-bottom: 16px;
}

.download-btn:hover {
    filter: brightness(1.1);
    transform: scale(1.02);
}

.platform-requirements {
    font-size: 12px;
    color: var(--text-muted);
}

/* Changelog Section */
.changelog-section {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-md);
    margin-bottom: 60px;
}

.changelog-section h2 {
    font-size: 24px;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.changelog-list {
    list-style: none;
    padding: 0;
}

.changelog-list li {
    padding: 8px 0 8px 28px;
    position: relative;
    color: var(--text-secondary);
}

.changelog-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #10b981;
    font-weight: bold;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.7);
    animation: fadeIn 0.3s;
}

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

.modal-content {
    background-color: white;
    margin: 5% auto;
    padding: 40px;
    border-radius: 20px;
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
    animation: slideIn 0.3s;
}

@keyframes slideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.close {
    color: #aaa;
    float: right;
    font-size: 35px;
    font-weight: bold;
    cursor: pointer;
    line-height: 20px;
}

.close:hover {
    color: #000;
}

.disclaimer {
    text-align: left;
    line-height: 2;
    color: #333;
}

.disclaimer h3 {
    color: #e74c3c;
    margin-bottom: 20px;
    font-size: 1.5em;
}

.disclaimer ul {
    margin-left: 25px;
    margin-top: 15px;
}

.disclaimer li {
    margin-bottom: 12px;
}

.agree-btn {
    background: #27ae60;
    color: white;
    padding: 15px 40px;
    border: none;
    border-radius: 50px;
    font-size: 1.1em;
    cursor: pointer;
    margin-top: 25px;
    transition: var(--transition);
    width: 100%;
}

.agree-btn:hover {
    background: #229954;
    transform: scale(1.02);
}

/* Sponsor Section */
.sponsor-section {
    text-align: center;
    padding: 30px;
}

.sponsor-section h3 {
    color: #667eea;
    margin-bottom: 20px;
    font-size: 1.8em;
}

.qr-codes {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
    margin-top: 30px;
}

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

.qr-placeholder {
    width: 200px;
    height: 200px;
    background: var(--gradient-primary);
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2em;
    margin-bottom: 15px;
    box-shadow: var(--shadow-md);
}

.qr-item p {
    font-weight: bold;
    color: #333;
}

/* Footer */
.footer {
    text-align: center;
    padding: 40px 0;
    color: var(--text-muted);
    font-size: 14px;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    transition: var(--transition);
}

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

/* Loading */
.loading-spinner {
    display: inline-block;
    width: 40px;
    height: 40px;
    border: 4px solid rgba(59, 130, 246, 0.3);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Responsive */
@media (max-width: 800px) {
    .hero h1 { font-size: 36px; }
    .platforms-grid { grid-template-columns: 1fr; }
    .version-bar { flex-direction: column; gap: 12px; }
    .nav { width: 100%; justify-content: center; }
}

@media (max-width: 480px) {
    .container { padding: 0 16px; }
    .hero h1 { font-size: 28px; }
}