/* style.css - leonyuzhao.me Main Site */

:root {
    --bg-primary: #0f1419;
    --bg-secondary: #1a2332;
    --bg-tertiary: #243044;
    --text-primary: #e7edf4;
    --text-secondary: #8b9eb3;
    --text-muted: #5c7089;
    --accent: #3d9eff;
    --accent-hover: #5eb0ff;
    --accent-glow: rgba(61, 158, 255, 0.3);
    --border: #2d3f54;
    --border-light: #3d5068;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
    --radius: 6px;
    --radius-lg: 12px;
}

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

html {
    font-size: 16px;
}

body {
    font-family: "JetBrains Mono", "Fira Code", "SF Mono", Consolas, monospace;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* Landing Page */
.landing-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem;
}

.landing-header {
    text-align: center;
    padding: 4rem 2rem 3rem;
}

.landing-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    font-size: 1rem;
    color: var(--text-secondary);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

/* Apps Grid */
.apps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    max-width: 800px;
    width: 100%;
    padding: 2rem;
}

.app-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-decoration: none;
    color: inherit;
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.app-card:hover {
    border-color: var(--accent);
    background: var(--bg-tertiary);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4), 0 0 0 1px var(--accent-glow);
}

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

.app-card h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.app-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Footer */
.landing-footer {
    margin-top: auto;
    padding: 2rem;
    text-align: center;
}

.landing-footer p {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Responsive */
@media (max-width: 768px) {
    html {
        font-size: 15px;
    }
    
    .landing-container {
        padding: 1.5rem;
    }
    
    .landing-header {
        padding: 3rem 1rem 2rem;
    }
    
    .landing-header h1 {
        font-size: 2rem;
    }
    
    .tagline {
        font-size: 0.875rem;
    }
    
    .apps-grid {
        grid-template-columns: 1fr;
        padding: 1rem;
        gap: 1rem;
    }
    
    .app-card {
        padding: 1.5rem;
    }
    
    .app-card:hover {
        transform: none;
    }
    
    .app-card:active {
        background: var(--bg-tertiary);
        border-color: var(--accent);
    }
    
    .app-icon {
        font-size: 2rem;
    }
    
    .app-card h2 {
        font-size: 1.125rem;
    }
    
    .landing-footer {
        padding: 1.5rem 1rem;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }
    
    .landing-container {
        padding: 1rem;
    }
    
    .landing-header {
        padding: 2rem 0.5rem 1.5rem;
    }
    
    .landing-header h1 {
        font-size: 1.6rem;
    }
    
    .apps-grid {
        padding: 0.5rem;
    }
    
    .app-card {
        padding: 1.25rem;
    }
    
    .app-card p {
        font-size: 0.8rem;
    }
}

/* Touch-friendly improvements */
@media (hover: none) and (pointer: coarse) {
    .app-card {
        -webkit-tap-highlight-color: transparent;
    }
    
    .app-card:hover {
        transform: none;
        box-shadow: none;
    }
}