/* ========================================
   CSS Variables & Reset
   ======================================== */
:root {
    /* Colors - Dark Theme inspired by CrazyGames */
    --color-bg-primary: #0a0a0f;
    --color-bg-secondary: #13131a;
    --color-bg-tertiary: #1a1a24;
    --color-bg-card: #1e1e2e;
    --color-bg-hover: #252535;

    --color-primary: #ff6b35;
    --color-primary-hover: #ff8555;
    --color-secondary: #4a90e2;

    --color-text-primary: #ffffff;
    --color-text-secondary: #b3b3b3;
    --color-text-muted: #808080;

    --color-border: #2a2a3a;
    --color-border-light: #3a3a4a;

    --color-success: #4caf50;
    --color-favorite: #ff4757;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;

    /* Layout */
    --header-height: 70px;
    --sidebar-collapsed-width: 70px;
    --sidebar-expanded-width: 240px;
    --container-max-width: 1400px;
    --border-radius-sm: 6px;
    --border-radius-md: 10px;
    --border-radius-lg: 16px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 12px 40px rgba(0, 0, 0, 0.6);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

ul {
    list-style: none;
}

/* ========================================
   Utility Classes
   ======================================== */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ========================================
   Header & Navigation
   ======================================== */
.header {
    position: sticky;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(13, 13, 26, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
    transition: var(--transition-base);
}

.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    gap: var(--spacing-lg);
}

.navbar-brand .logo h1 {
    font-size: var(--font-size-2xl);
    font-weight: 800;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: var(--spacing-sm);
    color: var(--color-text-primary);
}

.mobile-menu-toggle span {
    width: 24px;
    height: 3px;
    background-color: currentColor;
    border-radius: 2px;
    transition: var(--transition-base);
}

.navbar-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
    flex: 1;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-link {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-text-secondary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-sm);
    transition: var(--transition-fast);
    position: relative;
}

.nav-link:hover {
    color: var(--color-text-primary);
    background-color: var(--color-bg-tertiary);
}

.nav-link.active {
    color: var(--color-primary);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--color-primary);
    border-radius: 2px;
}

/* Search */
.search-container {
    position: relative;
    flex: 1;
    max-width: 400px;
    margin-left: auto;
}

.search-input {
    width: 100%;
    height: 42px;
    padding: var(--spacing-sm) var(--spacing-md) var(--spacing-sm) 42px;
    background-color: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-md);
    color: var(--color-text-primary);
    font-size: var(--font-size-base);
    outline: none;
    transition: var(--transition-fast);
}

.search-input:focus {
    border-color: var(--color-primary);
    background-color: var(--color-bg-card);
}

.search-input::placeholder {
    color: var(--color-text-muted);
}

.search-icon {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-muted);
    pointer-events: none;
}

/* ========================================
   Sidebar
   ======================================== */
.sidebar {
    position: fixed;
    left: 0;
    top: var(--header-height);
    bottom: 0;
    width: var(--sidebar-collapsed-width);
    background-color: var(--color-bg-secondary);
    border-right: 1px solid var(--color-border);
    transition: width var(--transition-base);
    z-index: 90;
    overflow: hidden;
}

.sidebar:hover {
    width: var(--sidebar-expanded-width);
}

.sidebar-content {
    height: 100%;
    display: flex;
    flex-direction: column;
    padding: var(--spacing-lg) 0;
}

.sidebar-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: 0 var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    white-space: nowrap;
}

.sidebar-icon {
    min-width: 24px;
    color: var(--color-primary);
}

.sidebar-title {
    font-size: var(--font-size-base);
    font-weight: 700;
    color: var(--color-text-primary);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.sidebar:hover .sidebar-title {
    opacity: 1;
}

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
}

.sidebar-nav::-webkit-scrollbar {
    width: 4px;
}

.sidebar-nav::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar-nav::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 2px;
}

.sidebar-nav::-webkit-scrollbar-thumb:hover {
    background: var(--color-border-light);
}

.sidebar-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
    white-space: nowrap;
    border-left: 3px solid transparent;
}

.sidebar-item:hover {
    background-color: var(--color-bg-tertiary);
    color: var(--color-text-primary);
}

.sidebar-item.active {
    background-color: var(--color-bg-tertiary);
    color: var(--color-primary);
    border-left-color: var(--color-primary);
}

.sidebar-item-icon {
    min-width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
}

.sidebar-item-text {
    opacity: 0;
    transition: opacity var(--transition-base);
}

.sidebar:hover .sidebar-item-text {
    opacity: 1;
}

/* ========================================
   Main Content
   ======================================== */
.main-content {
    min-height: calc(100vh - var(--header-height) - 100px);
    padding: var(--spacing-xl) 0;
    margin-left: var(--sidebar-collapsed-width);
    transition: margin-left var(--transition-base);
}

.content-wrapper {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

/* Section Title */
.section-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

/* Category Rows */
.category-rows {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.category-row {
    position: relative;
}

.category-row-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-sm);
}

.category-row-title {
    font-size: var(--font-size-base);
    font-weight: 700;
    color: var(--color-text-primary);
    cursor: pointer;
    transition: var(--transition-fast);
}

.category-row-title:hover {
    color: var(--color-primary);
}

/* Carousel Container */
.carousel-container {
    position: relative;
    overflow: hidden;
}

.carousel-nav-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(26, 26, 36, 0.95);
    backdrop-filter: blur(8px);
    border: 1px solid var(--color-border);
    border-radius: 50%;
    color: var(--color-text-primary);
    transition: var(--transition-fast);
    opacity: 0;
    z-index: 10;
    cursor: pointer;
}

.carousel-container:hover .carousel-nav-btn {
    opacity: 1;
}

.carousel-nav-btn.carousel-prev {
    left: var(--spacing-md);
}

.carousel-nav-btn.carousel-next {
    right: var(--spacing-md);
}

.carousel-nav-btn:hover {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    transform: translateY(-50%) scale(1.1);
}

.carousel-nav-btn:disabled {
    opacity: 0 !important;
    cursor: not-allowed;
    pointer-events: none;
}

.carousel-track {
    display: flex;
    gap: var(--spacing-sm);
    transition: transform var(--transition-base);
    scroll-behavior: smooth;
}

/* Games Section */
.games-section {
    margin-bottom: var(--spacing-2xl);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.games-count {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* Loading Spinner */
.loading-spinner {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
    gap: var(--spacing-md);
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--color-bg-tertiary);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.loading-spinner p {
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
}

/* Game Card in Carousel */
.game-card {
    position: relative;
    background-color: var(--color-bg-card);
    border-radius: var(--border-radius-md);
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition-base);
    border: 1px solid transparent;
    flex-shrink: 0;
    width: 200px;
    aspect-ratio: 4/3;
}

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

/* All Games Grid Section */
.all-games-section {
    margin-top: var(--spacing-xl);
}

.all-games-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.all-games-grid .game-card {
    width: 100%;
}

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

.game-card:hover .game-card-image {
    transform: scale(1.05);
}

.game-card-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.9) 0%, rgba(0, 0, 0, 0.4) 50%, transparent 100%);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: var(--spacing-md);
    opacity: 0;
    transition: var(--transition-base);
}

.game-card:hover .game-card-overlay {
    opacity: 1;
}

.game-card-title {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: white;
    line-height: 1.3;
}

.game-card-genres {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.game-card-genre {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    background-color: rgba(255, 255, 255, 0.1);
    padding: 2px 8px;
    border-radius: 4px;
}

.game-card-favorite {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    width: 36px;
    height: 36px;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition-fast);
    z-index: 10;
}

.game-card:hover .game-card-favorite {
    opacity: 1;
}

.game-card-favorite:hover {
    background-color: rgba(0, 0, 0, 0.8);
    transform: scale(1.1);
}

.game-card-favorite.is-favorite svg {
    fill: var(--color-favorite);
    stroke: var(--color-favorite);
}

.game-card-favorite svg {
    width: 18px;
    height: 18px;
    stroke: white;
    fill: none;
    transition: var(--transition-fast);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
}

.empty-state svg {
    margin: 0 auto var(--spacing-lg);
    color: var(--color-text-muted);
}

.empty-state h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

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

/* Load More */
.load-more-container {
    text-align: center;
    padding: var(--spacing-xl) 0;
}

.btn-load-more {
    padding: var(--spacing-md) var(--spacing-2xl);
    background-color: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-md);
    color: var(--color-text-primary);
    font-size: var(--font-size-base);
    font-weight: 600;
    transition: var(--transition-fast);
}

.btn-load-more:hover {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ========================================
   Game Modal
   ======================================== */
.game-modal {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.game-modal.active {
    display: flex;
}

.game-modal-overlay {
    position: absolute;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(4px);
}

.game-modal-content {
    position: relative;
    width: 95%;
    height: 95%;
    max-width: 1400px;
    max-height: 900px;
    background-color: var(--color-bg-secondary);
    border-radius: var(--border-radius-lg);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    animation: modalSlideUp 0.3s ease;
}

@keyframes modalSlideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.game-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg) var(--spacing-xl);
    background-color: var(--color-bg-tertiary);
    border-bottom: 1px solid var(--color-border);
}

.game-modal-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text-primary);
}

.game-modal-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.btn-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-bg-hover);
    border-radius: var(--border-radius-sm);
    color: var(--color-text-primary);
    transition: var(--transition-fast);
}

.btn-icon:hover {
    background-color: var(--color-bg-card);
    transform: scale(1.05);
}

.btn-icon.is-favorite {
    color: var(--color-favorite);
}

.btn-icon.is-favorite svg {
    fill: var(--color-favorite);
}

.btn-close {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-bg-hover);
    border-radius: var(--border-radius-sm);
    color: var(--color-text-primary);
    transition: var(--transition-fast);
}

.btn-close:hover {
    background-color: var(--color-primary);
    transform: scale(1.05);
}

.game-modal-body {
    flex: 1;
    position: relative;
    background-color: #000;
}

.game-iframe-container {
    width: 100%;
    height: 100%;
}

.game-iframe-container iframe {
    width: 100%;
    height: 100%;
    border: none;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background-color: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-xl) 0;
    margin-top: var(--spacing-2xl);
}

.footer-content {
    text-align: center;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

.footer-content p {
    margin-bottom: var(--spacing-sm);
}

.footer-note a {
    color: var(--color-primary);
    text-decoration: underline;
}

.footer-note a:hover {
    color: var(--color-primary-hover);
}

/* ========================================
   Responsive Design
   ======================================== */

/* Tablet */
@media (max-width: 1024px) {
    .games-grid {
        grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
        gap: var(--spacing-md);
    }
}

/* Mobile */
@media (max-width: 768px) {
    :root {
        --header-height: 60px;
        --sidebar-collapsed-width: 0px;
    }

    /* Hide sidebar on mobile */
    .sidebar {
        transform: translateX(-100%);
    }

    .main-content {
        margin-left: 0;
    }

    .content-wrapper {
        padding: 0 var(--spacing-md);
    }

    /* Mobile Navigation */
    .mobile-menu-toggle {
        display: flex;
    }

    .navbar-menu {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        flex-direction: column;
        background-color: var(--color-bg-secondary);
        border-bottom: 1px solid var(--color-border);
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition-base);
        box-shadow: var(--shadow-lg);
    }

    .navbar-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-links {
        flex-direction: column;
        width: 100%;
        gap: var(--spacing-sm);
    }

    .nav-link {
        width: 100%;
        padding: var(--spacing-md);
        text-align: center;
    }

    .search-container {
        width: 100%;
        max-width: 100%;
        margin-left: 0;
    }

    /* Game Card Mobile */
    .game-card {
        width: 150px;
    }

    .game-card-title {
        font-size: var(--font-size-sm);
    }

    /* All Games Grid Mobile */
    .all-games-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: var(--spacing-sm);
    }

    .all-games-grid .game-card {
        width: 100%;
    }

    /* Modal Mobile */
    .game-modal-content {
        width: 100%;
        height: 100%;
        max-width: 100%;
        max-height: 100%;
        border-radius: 0;
    }

    .game-modal-header {
        padding: var(--spacing-md);
    }

    .game-modal-title {
        font-size: var(--font-size-base);
    }

    .btn-icon,
    .btn-close {
        width: 36px;
        height: 36px;
    }

    /* Carousel controls - always show on mobile (no hover) */
    .carousel-nav-btn {
        width: 40px;
        height: 40px;
        opacity: 0.8;
    }

    .carousel-nav-btn.carousel-prev {
        left: var(--spacing-sm);
    }

    .carousel-nav-btn.carousel-next {
        right: var(--spacing-sm);
    }

    .carousel-nav-btn:active {
        transform: translateY(-50%) scale(0.95);
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .navbar-brand .logo h1 {
        font-size: var(--font-size-xl);
    }

    .game-card {
        width: 140px;
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }

    .category-row-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }

    /* All Games Grid Small Mobile */
    .all-games-grid {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    }
}

/* ========================================
   Utilities & Animations
   ======================================== */

/* Smooth Fade In */
.fade-in {
    animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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