:root {
    --bg-color: #0b0f19;
    --card-bg: rgba(20, 27, 44, 0.6);
    --card-hover: rgba(30, 41, 65, 0.85);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-highlight: rgba(56, 189, 248, 0.35);
    --text-color: #f8fafc;
    --text-muted: #94a3b8;
    --accent-cyan: #38bdf8;
    --accent-purple: #c084fc;
    --accent-orange: #fb923c;
    --accent-green: #4ade80;
    --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: 'Fira Code', monospace;
    --max-width: 1200px;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-sans);
    min-height: 100vh;
    line-height: 1.6;
    position: relative;
    padding-bottom: 4rem;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

/* Ambient Glow Spheres */
.glow-sphere-1 {
    position: fixed;
    top: -150px;
    left: 20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(56, 189, 248, 0.12) 0%, rgba(11, 15, 25, 0) 70%);
    pointer-events: none;
    z-index: 0;
}

.glow-sphere-2 {
    position: fixed;
    bottom: -200px;
    right: 15%;
    width: 700px;
    height: 700px;
    background: radial-gradient(circle, rgba(192, 132, 252, 0.1) 0%, rgba(11, 15, 25, 0) 70%);
    pointer-events: none;
    z-index: 0;
}

.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
    position: relative;
    z-index: 1;
}

/* Top Navigation Header */
header.hub-header {
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--border-color);
    backdrop-filter: blur(16px);
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(11, 15, 25, 0.85);
    margin-bottom: 3rem;
}

.nav-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--text-color);
    font-weight: 700;
    font-size: 1.25rem;
}

.brand-badge {
    background: rgba(56, 189, 248, 0.12);
    color: var(--accent-cyan);
    border: 1px solid var(--border-highlight);
    padding: 0.2rem 0.6rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    padding: 0.55rem 1.1rem;
    border-radius: 8px;
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    border: 1px solid transparent;
}

.btn-outline {
    border-color: var(--border-color);
    color: var(--text-color);
    background: rgba(255, 255, 255, 0.03);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-cyan) 0%, #0284c7 100%);
    color: #0b0f19;
    box-shadow: 0 4px 15px rgba(56, 189, 248, 0.25);
}

.btn-primary:hover {
    opacity: 0.95;
    box-shadow: 0 6px 20px rgba(56, 189, 248, 0.4);
    transform: translateY(-2px);
}

/* Hero Banner */
.hero-section {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 3.5rem;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(192, 132, 252, 0.1);
    border: 1px solid rgba(192, 132, 252, 0.3);
    color: var(--accent-purple);
    padding: 0.35rem 0.9rem;
    border-radius: 20px;
    font-size: 0.82rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
    letter-spacing: 0.02em;
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.15;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #ffffff 0%, #cbd5e1 50%, #94a3b8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-muted);
    line-height: 1.6;
}

/* Stats Telemetry Ticker */
.telemetry-bar {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    background: rgba(20, 27, 44, 0.4);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.25rem;
    margin-bottom: 3.5rem;
    backdrop-filter: blur(12px);
}

.telemetry-item {
    text-align: center;
    padding: 0.5rem;
    border-right: 1px solid var(--border-color);
}

.telemetry-item:last-child {
    border-right: none;
}

.telemetry-number {
    font-family: var(--font-mono);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--accent-cyan);
    margin-bottom: 0.2rem;
}

.telemetry-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Playground Cards Grid */
.grid-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.grid-title span.count {
    font-size: 0.85rem;
    font-family: var(--font-mono);
    color: var(--text-muted);
    background: rgba(255, 255, 255, 0.05);
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.subdomains-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.75rem;
    margin-bottom: 4rem;
}

.subdomain-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.75rem;
    backdrop-filter: blur(16px);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    text-decoration: none;
    color: var(--text-color);
    transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    overflow: hidden;
}

.subdomain-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.subdomain-card:hover {
    background: var(--card-hover);
    border-color: var(--border-highlight);
    transform: translateY(-4px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
}

.subdomain-card:hover::before {
    opacity: 1;
}

.card-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 1.25rem;
}

.card-icon {
    width: 52px;
    height: 52px;
    border-radius: 12px;
    background: rgba(56, 189, 248, 0.1);
    border: 1px solid var(--border-highlight);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    color: var(--accent-cyan);
}

.card-status {
    font-size: 0.72rem;
    font-weight: 700;
    font-family: var(--font-mono);
    padding: 0.25rem 0.6rem;
    border-radius: 20px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.status-live {
    background: rgba(74, 222, 128, 0.12);
    color: var(--accent-green);
    border: 1px solid rgba(74, 222, 128, 0.3);
}

.status-beta {
    background: rgba(251, 146, 60, 0.12);
    color: var(--accent-orange);
    border: 1px solid rgba(251, 146, 60, 0.3);
}

.card-body h3 {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 0.35rem;
    letter-spacing: -0.01em;
}

.card-subdomain {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--accent-cyan);
    margin-bottom: 0.85rem;
}

.card-description {
    font-size: 0.92rem;
    color: var(--text-muted);
    line-height: 1.55;
    margin-bottom: 1.5rem;
}

.card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-top: 1px solid var(--border-color);
    padding-top: 1rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-color);
}

.card-footer svg {
    transition: transform 0.2s ease;
}

.subdomain-card:hover .card-footer svg {
    transform: translateX(4px);
    color: var(--accent-cyan);
}

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

footer.hub-footer a {
    color: var(--accent-cyan);
    text-decoration: none;
}

@media (max-width: 768px) {
    .hero-title { font-size: 2.2rem; }
    .nav-wrapper { flex-direction: column; gap: 0.75rem; }
    .subdomains-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
    .hero-title { font-size: 1.8rem; }
    .hero-tag { font-size: 0.75rem; }
    .telemetry-bar { grid-template-columns: 1fr; }
    .telemetry-item { border-right: none; border-bottom: 1px solid var(--border-color); padding-bottom: 0.75rem; }
    .telemetry-item:last-child { border-bottom: none; }
}

/* Filter Switch Controls (Projet vs Fun) */
.filter-switch-wrapper {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin: 1.5rem 0 2rem 0;
    flex-wrap: wrap;
}

.filter-btn {
    background: rgba(20, 27, 44, 0.7);
    color: var(--text-muted);
    border: 1px solid var(--border-color);
    padding: 0.6rem 1.25rem;
    border-radius: 30px;
    font-family: var(--font-sans);
    font-size: 0.92rem;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.25s ease;
    backdrop-filter: blur(8px);
}

.filter-btn:hover {
    color: var(--text-color);
    border-color: var(--border-highlight);
    background: rgba(30, 41, 65, 0.9);
}

.filter-btn.active {
    background: linear-gradient(135deg, rgba(56, 189, 248, 0.25), rgba(192, 132, 252, 0.2));
    color: #ffffff;
    border-color: var(--accent-cyan);
    box-shadow: 0 0 15px rgba(56, 189, 248, 0.2);
}

.filter-btn .badge-count {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-color);
    padding: 0.15rem 0.5rem;
    border-radius: 12px;
    font-size: 0.78rem;
    font-weight: 700;
}

.filter-btn.active .badge-count {
    background: var(--accent-cyan);
    color: #0b0f19;
}

/* Category Badge on Tile Card */
.category-badge {
    font-size: 0.7rem;
    font-weight: 700;
    padding: 0.2rem 0.55rem;
    border-radius: 6px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.category-badge.cat-projet {
    background: rgba(56, 189, 248, 0.15);
    color: var(--accent-cyan);
    border: 1px solid rgba(56, 189, 248, 0.35);
}

.category-badge.cat-fun {
    background: rgba(251, 146, 60, 0.15);
    color: var(--accent-orange);
    border: 1px solid rgba(251, 146, 60, 0.35);
}