:root {
    --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    --radius-pill: 9999px;

    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-theme: 300ms ease;

    --max-width: 1280px;
    --navbar-height: 64px;
}

/* Tema oscuro (default) */
[data-theme="dark"] {
    --bg-primary: #0a0a0a;
    --bg-surface: #141414;
    --bg-elevated: #1f1f1f;
    --bg-hover: #262626;
    --text-primary: #f5f5f5;
    --text-secondary: #a0a0a0;
    --text-muted: #666666;
    --accent: #4e85bf;
    --accent-hover: #3a6da3;
    --border: #2a2a2a;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.45);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.55);
    --engine-renpy: #8b5cf6;
    --engine-unity: #1f1f1f;
    --engine-web: #3b82f6;
    --engine-umineko-ru: #06b6d4;
    --code-bg: #1a1a1a;
}

/* Tema claro */
[data-theme="light"] {
    --bg-primary: #fafafa;
    --bg-surface: #ffffff;
    --bg-elevated: #f3f4f6;
    --bg-hover: #e5e7eb;
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --text-muted: #9ca3af;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --border: #e5e7eb;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.1);
    --engine-renpy: #7c3aed;
    --engine-unity: #111827;
    --engine-web: #2563eb;
    --engine-umineko-ru: #0891b2;
    --code-bg: #f3f4f6;
}

/* Tema inmersivo */
[data-theme="immersive"] {
    --bg-primary: #050510;
    --bg-surface: rgba(20, 20, 45, 0.62);
    --bg-elevated: rgba(32, 32, 66, 0.72);
    --bg-hover: rgba(45, 45, 90, 0.8);
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.78);
    --text-muted: rgba(255, 255, 255, 0.5);
    --accent: #8b5cf6;
    --accent-hover: #7c3aed;
    --border: rgba(255, 255, 255, 0.12);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.35);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.45);
    --shadow-lg: 0 20px 48px rgba(0, 0, 0, 0.55);
    --engine-renpy: #a78bfa;
    --engine-unity: #0f172a;
    --engine-web: #60a5fa;
    --engine-umineko-ru: #22d3ee;
    --code-bg: rgba(15, 15, 35, 0.7);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    transition: background-color var(--transition-theme), color var(--transition-theme);
}

[data-theme="immersive"] body {
    background:
        radial-gradient(circle at 15% 25%, rgba(76, 29, 149, 0.25) 0%, transparent 35%),
        radial-gradient(circle at 85% 70%, rgba(59, 130, 246, 0.18) 0%, transparent 30%),
        linear-gradient(180deg, #050510 0%, #0f172a 100%);
    background-attachment: fixed;
}

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

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--navbar-height);
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    z-index: 100;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: background-color var(--transition-theme), border-color var(--transition-theme);
}

.navbar-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: -0.02em;
}

.brand-icon {
    width: 1.6rem;
    height: 1.6rem;
    color: var(--accent);
}

.theme-switcher {
    display: inline-flex;
    align-items: center;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-pill);
    padding: 0.25rem;
    gap: 0.15rem;
    transition: background-color var(--transition-theme), border-color var(--transition-theme);
}

.theme-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.4rem 0.65rem;
    border: none;
    border-radius: var(--radius-pill);
    background: transparent;
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.theme-btn svg {
    width: 0.95rem;
    height: 0.95rem;
}

.theme-btn:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
}

.theme-btn.active {
    background: var(--accent);
    color: #fff;
    box-shadow: var(--shadow-sm);
}

.theme-btn span {
    display: none;
}

@media (min-width: 640px) {
    .theme-btn span {
        display: inline;
    }
    .theme-btn {
        padding: 0.45rem 0.9rem;
    }
}

/* Hero */
.hero {
    padding-top: calc(var(--navbar-height) + 3rem);
    padding-bottom: 2.5rem;
    text-align: center;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.25rem);
    font-weight: 700;
    line-height: 1.15;
    margin: 0 0 1rem;
    letter-spacing: -0.03em;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--text-secondary);
    max-width: 680px;
    margin: 0 auto;
    line-height: 1.6;
}

/* Main content */
.main-content {
    padding-bottom: 4rem;
}

.toolbar {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1.75rem;
}

@media (min-width: 768px) {
    .toolbar {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
    }
}

.stats {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.engine-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.legend-item {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding: 0.25rem 0.6rem;
    border-radius: var(--radius-pill);
    border: 1px solid var(--border);
    background: var(--bg-surface);
}

.legend-dot {
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 50%;
}

/* Games grid */
.games-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

@media (min-width: 640px) {
    .games-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .games-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (min-width: 1280px) {
    .games-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* Game card */
.game-card {
    display: flex;
    flex-direction: column;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-base), box-shadow var(--transition-base), background-color var(--transition-theme), border-color var(--transition-theme);
    animation: cardEnter 0.5s ease-out both;
}

@keyframes cardEnter {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.game-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.game-cover {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    background: var(--bg-elevated);
    overflow: hidden;
}

.game-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-base);
}

.game-card:hover .game-cover img {
    transform: scale(1.04);
}

.game-cover-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
}

.game-cover-placeholder svg {
    width: 3rem;
    height: 3rem;
    opacity: 0.5;
}

.engine-badge {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.3rem 0.6rem;
    border-radius: var(--radius-pill);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: #fff;
    background: rgba(0, 0, 0, 0.65);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.engine-badge.renpy { background: var(--engine-renpy); }
.engine-badge.unity { background: var(--engine-unity); }
.engine-badge.web { background: var(--engine-web); }
.engine-badge.umineko-ru { background: var(--engine-umineko-ru); }

.engine-badge svg {
    width: 0.75rem;
    height: 0.75rem;
}

.game-info {
    display: flex;
    flex-direction: column;
    flex: 1;
    padding: 1rem;
    gap: 0.4rem;
}

.game-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin: 0;
    line-height: 1.3;
    color: var(--text-primary);
}

.game-subtitle {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin: 0;
}

.game-description {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin: 0.25rem 0 0;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    flex: 1;
}

.game-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-top: 0.75rem;
    font-size: 0.75rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

.game-actions {
    margin-top: 1rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.6rem 1.1rem;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    border: 1px solid transparent;
    transition: background-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn-primary {
    background: var(--accent);
    color: #fff;
    width: 100%;
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-primary svg {
    width: 0.9rem;
    height: 0.9rem;
}

/* Empty state */
.empty-state {
    text-align: center;
    padding: 4rem 1rem;
    background: var(--bg-surface);
    border: 1px dashed var(--border);
    border-radius: var(--radius-lg);
    transition: background-color var(--transition-theme), border-color var(--transition-theme);
}

.empty-state.hidden {
    display: none;
}

.empty-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 4rem;
    height: 4rem;
    border-radius: 50%;
    background: var(--bg-elevated);
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.empty-icon svg {
    width: 2rem;
    height: 2rem;
}

.empty-state h2 {
    margin: 0 0 0.5rem;
    font-size: 1.25rem;
    color: var(--text-primary);
}

.empty-state p {
    margin: 0;
    color: var(--text-secondary);
}

.empty-state code {
    display: inline-block;
    background: var(--code-bg);
    padding: 0.15rem 0.4rem;
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-primary);
}

/* Skeleton loading */
.skeleton {
    background: linear-gradient(90deg, var(--bg-elevated) 25%, var(--bg-hover) 50%, var(--bg-elevated) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.4s infinite;
    border-radius: var(--radius-md);
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* Footer */
.footer {
    margin-top: auto;
    padding: 1.75rem 0;
    border-top: 1px solid var(--border);
    background: var(--bg-surface);
    transition: background-color var(--transition-theme), border-color var(--transition-theme);
}

.footer-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.85rem;
    color: var(--text-muted);
    text-align: center;
}

@media (min-width: 640px) {
    .footer-inner {
        flex-direction: row;
        justify-content: space-between;
    }
}

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