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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: #333;
    -webkit-tap-highlight-color: transparent;
}

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

/* Header */
header {
    text-align: center;
    margin-bottom: 40px;
    color: white;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    font-weight: 300;
}

/* App Grid */
.app-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

/* App Card */
.app-card {
    background: white;
    border-radius: 16px;
    padding: 30px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    position: relative;
    overflow: hidden;
    text-decoration: none;
    display: block;
    border: none;
    text-align: left;
    width: 100%;
}

.app-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 6px;
    background: var(--app-color);
    transition: height 0.3s ease;
}

.app-card:hover::before,
.app-card:focus::before {
    height: 12px;
}

.app-card:hover,
.app-card:focus {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
}

.app-card:active {
    transform: translateY(-4px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.12);
}

/* App Card Content */
.app-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    background: var(--app-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin-bottom: 15px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.app-title {
    font-size: 1.4rem;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 8px;
    line-height: 1.3;
}

.app-description {
    font-size: 0.95rem;
    color: #666;
    line-height: 1.5;
}

/* Loading State */
.loading {
    text-align: center;
    padding: 60px 20px;
    color: white;
}

.spinner {
    width: 50px;
    height: 50px;
    margin: 0 auto 20px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading p {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* Error State */
.error {
    background: white;
    border-radius: 16px;
    padding: 40px;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.error p {
    font-size: 1.1rem;
    color: #e74c3c;
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: 15px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .app-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
        gap: 15px;
    }
    
    .app-card {
        padding: 24px;
    }
    
    .app-title {
        font-size: 1.2rem;
    }
    
    .app-description {
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .app-grid {
        grid-template-columns: 1fr;
    }
    
    .app-card {
        padding: 28px;
    }
}

/* Touch Enhancement */
@media (hover: none) {
    .app-card:active {
        transform: scale(0.98);
    }
}

/* Focus Styles for Accessibility */
.app-card:focus {
    outline: 3px solid rgba(255, 255, 255, 0.8);
    outline-offset: 4px;
}

/* Fade-in Animation */
.app-card {
    animation: fadeIn 0.5s ease-out forwards;
    opacity: 0;
}

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

/* Stagger animation delay for cards */
.app-card:nth-child(1) { animation-delay: 0.05s; }
.app-card:nth-child(2) { animation-delay: 0.1s; }
.app-card:nth-child(3) { animation-delay: 0.15s; }
.app-card:nth-child(4) { animation-delay: 0.2s; }
.app-card:nth-child(5) { animation-delay: 0.25s; }
.app-card:nth-child(6) { animation-delay: 0.3s; }
.app-card:nth-child(7) { animation-delay: 0.35s; }
.app-card:nth-child(8) { animation-delay: 0.4s; }
.app-card:nth-child(n+9) { animation-delay: 0.45s; }