:root {
    --bg-color: #0b0c10;
    --card-bg: #14151a;
    --card-hover-bg: #1a1c23;
    --border-color: rgba(255, 255, 255, 0.06);
    --border-hover: rgba(168, 85, 247, 0.3);
    
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --accent: #a855f7;
    --accent-hover: #c084fc;
    --accent-glow: rgba(168, 85, 247, 0.15);
    
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
}

.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 24px;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 48px;
}

.logo {
    font-size: 3rem;
    font-weight: 700;
    letter-spacing: -0.05em;
    background: linear-gradient(135deg, #e9d5ff, #c084fc, #a855f7);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
    user-select: none;
}

/* Filters */
.filters {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 40px;
    justify-content: center;
}

.filter-btn {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 8px 16px;
    border-radius: 9999px; /* Pill shape */
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 6px;
}

.filter-btn:hover {
    background: var(--card-hover-bg);
    color: var(--text-primary);
    border-color: rgba(255, 255, 255, 0.15);
}

.filter-btn.active {
    background: var(--accent-glow);
    border-color: var(--accent);
    color: #e9d5ff;
}

/* Grid */
.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

/* Cards */
.card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 24px;
    display: flex;
    flex-direction: column;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    text-decoration: none;
    color: inherit;
}

.card:hover {
    transform: translateY(-4px);
    border-color: var(--border-hover);
    box-shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.5), 0 0 20px -5px var(--accent-glow);
}

/* Informational cards without links */
.card.no-link:hover {
    transform: none;
    border-color: var(--border-color);
    box-shadow: none;
    cursor: default;
}

/* Header inside card */
.card-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 12px;
}

.card-title-group {
    display: flex;
    gap: 12px;
    align-items: flex-start;
}

.card-icon {
    width: 24px;
    height: 24px;
    color: var(--accent);
    flex-shrink: 0;
    margin-top: 2px;
}

.card-title {
    font-size: 1.125rem;
    font-weight: 600;
    line-height: 1.4;
    color: var(--text-primary);
}

.card-desc {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    flex-grow: 1;
    margin-bottom: 20px;
}

/* Sublinks area */
.sublinks {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.sublink {
    font-size: 0.8125rem;
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-secondary);
    padding: 4px 10px;
    border-radius: 6px;
    text-decoration: none;
    transition: all 0.2s ease;
    border: 1px solid transparent;
}

.sublink:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
}

.card:hover .sublink {
    border-color: rgba(255, 255, 255, 0.08);
}

/* Footer / Tags area */
.card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: auto;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.card-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.card-tag {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.card-action {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-secondary);
    transition: all 0.2s ease;
}

.card:hover .card-action {
    background: var(--accent);
    color: #fff;
}

/* Layout adjusting for smaller screens */
.filters-wrapper {
    position: relative;
    max-width: 100%;
}

@media (max-width: 640px) {
    .logo {
        font-size: 2.25rem;
    }
    
    .grid-container {
        grid-template-columns: 1fr;
    }
    
    .filters-wrapper::after {
        content: '';
        position: absolute;
        top: 0;
        right: 0;
        bottom: 0;
        width: 48px;
        background: linear-gradient(to right, transparent, var(--bg-color) 90%);
        pointer-events: none;
    }

    .filters {
        justify-content: flex-start;
        overflow-x: auto;
        padding-bottom: 8px;
        flex-wrap: nowrap;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none; /* Firefox */
    }
    .filters::-webkit-scrollbar {
        display: none; /* Safari and Chrome */
    }
}

/* Infrastructure and Footer */
.infrastructure {
    margin-top: 80px;
    padding-top: 40px;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.infra-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 16px;
}

.infra-links {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.infra-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9375rem;
    transition: color 0.2s;
}

.infra-link:hover {
    color: var(--text-primary);
}

.infra-dot {
    color: var(--border-color);
    font-size: 0.875rem;
}

.footer {
    margin-top: 40px;
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-muted);
    padding-bottom: 24px;
}

.footer-link {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.2s;
}

.footer-link:hover {
    color: var(--accent-hover);
}