/* 
 * Core Variables & Theme
 * Premium Dark Cinematic Archive
 */
 :root {
    /* Colors */
    --bg-primary: #0a0a0a;
    --bg-secondary: #121212;
    --bg-surface: #1a1a1a;
    --bg-hover: #222222;
    
    --text-primary: #f5f5f5;
    --text-secondary: #a0a0a0;
    --text-muted: #666666;
    
    --accent: #e0e0e0;
    --accent-glow: rgba(224, 224, 224, 0.15);
    
    --border-subtle: rgba(255, 255, 255, 0.08);
    --glass-bg: rgba(10, 10, 10, 0.75);
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* Layout & Spacing */
    --max-width: 1440px;
    --nav-height: 72px;
    
    /* Transitions */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

/* 
 * CSS Reset & Base Setup
 */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    background-color: var(--bg-primary);
    color: var(--text-primary);
}

body {
    font-family: var(--font-sans);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

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

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

ul, ol {
    list-style: none;
}

/* 
 * Typography
 */
h1, h2, h3, h4, h5, h6 {
    font-weight: 500;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
}

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.text-center {
    text-align: center;
}

/* 
 * Layout Containers
 */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

main {
    flex: 1;
    margin-top: var(--nav-height);
    padding: 3rem 0;
    position: relative;
    z-index: 1;
}

/* 
 * Navbar
 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-subtle);
    z-index: 100;
    display: flex;
    align-items: center;
    transition: transform var(--transition-normal);
}

.navbar.hidden {
    transform: translateY(-100%);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.nav-brand {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--accent);
    transition: width var(--transition-fast);
}

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

.nav-link:hover::after, .nav-link.active::after {
    width: 100%;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.search-toggle {
    color: var(--text-secondary);
    font-size: 1.25rem;
    transition: color var(--transition-fast);
}

.search-toggle:hover {
    color: var(--text-primary);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    width: 24px;
    cursor: pointer;
}

.mobile-menu-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--text-primary);
    transition: transform var(--transition-fast), opacity var(--transition-fast);
}

/* 
 * Shared UI Elements
 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
    background: transparent;
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.btn:hover {
    background: var(--bg-surface);
    border-color: var(--text-secondary);
}

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

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

/* 
 * Global Search Overlay
 */
.search-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    z-index: 200;
    display: flex;
    flex-direction: column;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.search-overlay.active {
    opacity: 1;
    visibility: visible;
}

.search-header {
    height: var(--nav-height);
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--border-subtle);
}

.search-input-wrapper {
    flex: 1;
    display: flex;
    align-items: center;
}

.search-input {
    width: 100%;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    font-family: var(--font-sans);
    padding: 0 1rem;
    outline: none;
}

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

.search-close {
    font-size: 1.5rem;
    color: var(--text-secondary);
}

.search-close:hover {
    color: var(--text-primary);
}

.search-results-container {
    flex: 1;
    overflow-y: auto;
    padding: 2rem 0;
}

/* 
 * Footer
 */
footer {
    border-top: 1px solid var(--border-subtle);
    padding: 3rem 0;
    text-align: center;
    margin-top: auto;
    background: var(--bg-primary);
    z-index: 10;
}

.footer-content p {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin: 0;
}

/* 
 * Animations & Utilities
 */
.fade-in {
    animation: fadeIn var(--transition-normal) forwards;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* Back to Top */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-normal);
    z-index: 90;
    box-shadow: 0 4px 12px rgba(0,0,0,0.5);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--bg-hover);
    border-color: var(--text-secondary);
}

/* Loading Spinner */
.loader {
    width: 48px;
    height: 48px;
    border: 3px solid var(--border-subtle);
    border-bottom-color: var(--text-primary);
    border-radius: 50%;
    display: inline-block;
    box-sizing: border-box;
    animation: rotation 1s linear infinite;
    margin: 2rem auto;
}

@keyframes rotation {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}