/* CSS Variables - Light friendly theme */
:root {
    --color-bg: #f5f7fa;
    --color-surface: #ffffff;
    --color-surface-hover: #f0f4f8;
    --color-primary: #6366f1;
    --color-primary-light: #818cf8;
    --color-primary-glow: rgba(99, 102, 241, 0.15);
    --color-success: #10b981;
    --color-success-light: #34d399;
    --color-success-glow: rgba(16, 185, 129, 0.15);
    --color-text: #1e293b;
    --color-text-muted: #64748b;
    --color-border: #e2e8f0;
    --color-header-bg: #6366f1;
    --transition-speed: 0.3s;
    --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-card-hover: 0 10px 25px rgba(0, 0, 0, 0.1), 0 6px 10px rgba(0, 0, 0, 0.08);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    min-height: 100vh;
    min-height: 100dvh;
    line-height: 1.5;
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--color-header-bg) 0%, #8b5cf6 100%);
    padding: 2rem 1rem;
    text-align: center;
    color: white;
}

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

.header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
    color: white;
}

.subtitle {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1rem;
}

/* Main */
.main {
    padding: 1.5rem 1rem;
    max-width: 1400px;
    margin: 0 auto;
}

/* Filters Section */
.filters-section {
    margin-bottom: 1.5rem;
}

/* Category Filters */
.category-filters {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: center;
    margin-bottom: 1rem;
}

.filter-btn {
    padding: 0.5rem 1rem;
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text-muted);
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all var(--transition-speed);
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    white-space: nowrap;
    box-shadow: var(--shadow-card);
}

.filter-btn:hover {
    background: var(--color-surface);
    color: var(--color-text);
    border-color: var(--color-primary-light);
}

.filter-btn.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
    font-weight: 600;
    box-shadow: 0 4px 12px var(--color-primary-glow);
}

/* Results Counter */
.results-counter {
    text-align: center;
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

#results-count {
    font-weight: 700;
    color: var(--color-primary);
}

/* Grid */
.grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

/* Cards */
.card {
    background: var(--color-surface);
    border-radius: 16px;
    padding: 1.25rem;
    border: 1px solid var(--color-border);
    transition: all var(--transition-speed);
    position: relative;
    overflow: hidden;
    opacity: 0;
    transform: translateY(20px);
    box-shadow: var(--shadow-card);
}

.card.visible {
    opacity: 1;
    transform: translateY(0);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-card-hover);
    border-color: var(--color-primary-light);
}

.card:active {
    transform: scale(0.98);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.5rem;
}

.card-category {
    display: inline-block;
    font-size: 0.75rem;
    padding: 0.25rem 0.6rem;
    background: var(--color-bg);
    border-radius: 12px;
    color: var(--color-text-muted);
}

.card-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--color-text);
    letter-spacing: -0.01em;
}

.card-description {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: 1rem;
    line-height: 1.5;
}

.card-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 0.75rem 1.5rem;
    background: var(--color-success);
    color: white;
    text-decoration: none;
    border-radius: 10px;
    font-weight: 700;
    font-size: 0.95rem;
    transition: all var(--transition-speed);
    min-height: 48px;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.card-button:hover {
    background: var(--color-success-light);
    box-shadow: 0 4px 12px var(--color-success-glow);
    transform: scale(1.02);
}

/* Footer */
.footer {
    padding: 2rem 1rem;
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.85rem;
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    margin-top: 2rem;
}

/* Responsive */
@media (min-width: 480px) {
    .grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 768px) {
    .header {
        padding: 2.5rem 2rem;
    }

    .header h1 {
        font-size: 2.25rem;
    }

    .subtitle {
        font-size: 1.1rem;
    }

    .grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .main {
        padding: 2rem;
    }

    .category-filters {
        gap: 0.75rem;
    }
}

@media (min-width: 1024px) {
    .header h1 {
        font-size: 2.5rem;
    }

    .grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* Offline Banner */
.offline-banner {
    background: #f59e0b;
    color: #1e293b;
    text-align: center;
    padding: 0.6rem 1rem;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all var(--transition-speed);
}

/* Disabled Cards (offline + requires internet) */
.card-disabled {
    opacity: 0.45;
    pointer-events: none;
    filter: grayscale(100%);
}

.card-disabled .card-title,
.card-disabled .card-description {
    color: var(--color-text-muted);
}

.card-button-disabled {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 0.75rem 1.5rem;
    background: #94a3b8;
    color: white;
    border-radius: 10px;
    font-weight: 700;
    font-size: 0.85rem;
    min-height: 48px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.offline-badge {
    display: inline-block;
    font-size: 0.7rem;
    padding: 0.2rem 0.5rem;
    background: #f59e0b;
    color: #1e293b;
    border-radius: 10px;
    font-weight: 600;
}

/* Hidden utility */
.hidden {
    display: none !important;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Mobile scroll for filters */
@media (max-width: 479px) {
    .category-filters {
        flex-wrap: nowrap;
        overflow-x: auto;
        justify-content: flex-start;
        padding: 0.5rem 0;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        -ms-overflow-style: none;
    }

    .category-filters::-webkit-scrollbar {
        display: none;
    }
}