/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --primary: #667eea;
    --primary-dark: #5a67d8;
    --secondary: #764ba2;
    --bg: #f5f5f7;
    --surface: #ffffff;
    --text: #1d1d1f;
    --text-secondary: #86868b;
    --border: #e5e5e7;
    --shadow: 0 4px 24px rgba(0,0,0,0.08);
    --shadow-hover: 0 8px 32px rgba(0,0,0,0.12);
    --radius: 16px;
    --transition: 0.3s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background: var(--surface);
    box-shadow: 0 1px 0 var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.1em;
}

.logo-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 0.85em;
    font-weight: 800;
}

.nav {
    display: flex;
    gap: 24px;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.95em;
    font-weight: 500;
    transition: color var(--transition);
    padding: 6px 0;
    border-bottom: 2px solid transparent;
}

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

/* Hero */
.hero {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    padding: 100px 20px 80px;
    text-align: center;
    color: white;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 60%);
    animation: rotate 30s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 3.5em;
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 1.3em;
    opacity: 0.9;
    margin-bottom: 12px;
    font-weight: 500;
}

.hero-desc {
    font-size: 1.1em;
    opacity: 0.8;
    max-width: 500px;
    margin: 0 auto;
}

/* Apps Section */
.apps-section {
    padding: 60px 0;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
    flex-wrap: wrap;
    gap: 20px;
}

.section-header h2 {
    font-size: 1.8em;
    font-weight: 700;
}

.filter-bar {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 8px 18px;
    border: 1px solid var(--border);
    background: var(--surface);
    border-radius: 20px;
    font-size: 0.85em;
    cursor: pointer;
    transition: all var(--transition);
    color: var(--text-secondary);
}

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

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

/* Apps Grid */
.apps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 24px;
}

.app-card {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 28px;
    box-shadow: var(--shadow);
    transition: all var(--transition);
    cursor: pointer;
    text-decoration: none;
    color: inherit;
    display: block;
}

.app-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.app-card-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
}

.app-icon {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 24px;
    font-weight: 700;
    flex-shrink: 0;
}

.app-info {
    flex: 1;
    min-width: 0;
}

.app-name {
    font-size: 1.2em;
    font-weight: 700;
    margin-bottom: 4px;
}

.app-tagline {
    font-size: 0.9em;
    color: var(--text-secondary);
}

.app-desc {
    color: var(--text-secondary);
    font-size: 0.95em;
    line-height: 1.6;
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.app-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.app-platforms {
    display: flex;
    gap: 6px;
}

.platform-tag {
    background: var(--bg);
    padding: 4px 10px;
    border-radius: 8px;
    font-size: 0.75em;
    color: var(--text-secondary);
    font-weight: 500;
}

.app-version {
    font-size: 0.8em;
    color: var(--text-secondary);
}

/* About Section */
.about-section {
    padding: 60px 0;
    background: var(--surface);
    text-align: center;
}

.about-section h2 {
    font-size: 1.8em;
    font-weight: 700;
    margin-bottom: 20px;
}

.about-section p {
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 12px;
}

/* Footer */
.footer {
    padding: 40px 0;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9em;
    border-top: 1px solid var(--border);
}

/* Responsive */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.2em;
    }
    
    .hero-subtitle {
        font-size: 1.1em;
    }
    
    .hero-desc {
        font-size: 0.95em;
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .apps-grid {
        grid-template-columns: 1fr;
    }
    
    .nav {
        gap: 16px;
    }
    
    .header-inner {
        padding: 0 16px;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 60px 16px 50px;
    }
    
    .hero-title {
        font-size: 1.8em;
    }
    
    .app-card {
        padding: 20px;
    }
    
    .filter-bar {
        width: 100%;
    }
    
    .filter-btn {
        flex: 1;
        text-align: center;
    }
}