/* ============================================
   JAVA STUDY HUB - Premium Design System
   Borg El Arab Technological University
   ============================================ */

/* CSS Custom Properties - Dark Theme (Default) */
:root {
    /* Color System */
    --primary: #6C63FF;
    --primary-light: #8B83FF;
    --primary-dark: #5A52E0;
    --accent: #FF6B35;
    --accent-light: #FF8A5C;
    --accent-dark: #E05520;
    --success: #00C853;
    --success-light: #69F0AE;
    --warning: #FFD600;
    --danger: #FF1744;
    --info: #00B0FF;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #6C63FF 0%, #F72585 100%);
    --gradient-accent: linear-gradient(135deg, #FF6B35 0%, #FFD600 100%);
    --gradient-success: linear-gradient(135deg, #00C853 0%, #69F0AE 100%);
    --gradient-hero: linear-gradient(135deg, #0f0c29 0%, #302b63 50%, #24243e 100%);
    
    /* Typography */
    --font-primary: 'Cairo', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-arabic: 'Cairo', 'Inter', -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* Sizes */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    --text-6xl: 3.75rem;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    
    /* Radii */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-2xl: 24px;
    --radius-full: 50%;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.15);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.2);
    --shadow-xl: 0 20px 60px rgba(0,0,0,0.3);
    --shadow-glow: 0 0 40px rgba(108, 99, 255, 0.3);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Z-Index */
    --z-dropdown: 100;
    --z-nav: 200;
    --z-modal: 300;
    --z-toast: 400;
}

/* Dark Theme Colors */
[data-theme="dark"] {
    --bg-primary: #0A0A1A;
    --bg-secondary: #12122A;
    --bg-tertiary: #1A1A3E;
    --bg-card: rgba(26, 26, 62, 0.7);
    --bg-card-hover: rgba(36, 36, 82, 0.8);
    --bg-glass: rgba(26, 26, 62, 0.6);
    --bg-input: rgba(26, 26, 62, 0.8);
    --bg-code: #1E1E3F;
    --bg-nav: rgba(10, 10, 26, 0.85);
    
    --text-primary: #FFFFFF;
    --text-secondary: #B4B4D0;
    --text-tertiary: #7A7A9E;
    --text-muted: #5A5A7E;
    
    --border-primary: rgba(108, 99, 255, 0.2);
    --border-secondary: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(108, 99, 255, 0.4);
    
    --scrollbar-bg: #1A1A3E;
    --scrollbar-thumb: #3A3A6E;
}

/* Light Theme Colors */
[data-theme="light"] {
    --bg-primary: #F5F5FF;
    --bg-secondary: #FFFFFF;
    --bg-tertiary: #EEF0FF;
    --bg-card: rgba(255, 255, 255, 0.9);
    --bg-card-hover: rgba(255, 255, 255, 1);
    --bg-glass: rgba(255, 255, 255, 0.7);
    --bg-input: rgba(238, 240, 255, 0.8);
    --bg-code: #2D2B55;
    --bg-nav: rgba(245, 245, 255, 0.9);
    
    --text-primary: #1A1A2E;
    --text-secondary: #4A4A6A;
    --text-tertiary: #7A7A9E;
    --text-muted: #9A9ABE;
    
    --border-primary: rgba(108, 99, 255, 0.15);
    --border-secondary: rgba(0, 0, 0, 0.06);
    --border-hover: rgba(108, 99, 255, 0.3);
    
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 60px rgba(0,0,0,0.12);
    --shadow-glow: 0 0 40px rgba(108, 99, 255, 0.15);
    
    --scrollbar-bg: #EEF0FF;
    --scrollbar-thumb: #C4C4E0;
}

/* ============================================
   BASE STYLES
   ============================================ */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    max-width: 100%;
    overflow-x: hidden;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    min-height: 100vh;
    transition: background var(--transition-base), color var(--transition-base);
}

/* Custom Scrollbar */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--scrollbar-bg); }
::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--primary); }

/* Selection */
::selection {
    background: var(--primary);
    color: white;
}

/* ============================================
   ANIMATED BACKGROUND
   ============================================ */
.bg-animation {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.bg-circle {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.15;
    animation: float 20s ease-in-out infinite;
}

.circle-1 {
    width: 600px; height: 600px;
    background: var(--primary);
    top: -200px; right: -200px;
    animation-delay: 0s;
}

.circle-2 {
    width: 400px; height: 400px;
    background: var(--accent);
    bottom: -100px; left: -100px;
    animation-delay: -7s;
}

.circle-3 {
    width: 300px; height: 300px;
    background: #F72585;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -14s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(30px, -30px) scale(1.05); }
    50% { transform: translate(-20px, 20px) scale(0.95); }
    75% { transform: translate(15px, 15px) scale(1.02); }
}

[data-theme="light"] .bg-circle {
    opacity: 0.08;
}

/* ============================================
   NAVIGATION
   ============================================ */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: var(--z-nav);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    background: var(--bg-nav);
    border-bottom: 1px solid var(--border-secondary);
    transition: all var(--transition-base);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-8);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    cursor: pointer;
    text-decoration: none;
}

.brand-icon svg { width: 36px; height: 36px; }

.brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.brand-title {
    font-weight: 800;
    font-size: var(--text-sm);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.brand-subtitle {
    font-family: var(--font-arabic);
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    font-weight: 500;
}

.nav-center {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    background: var(--bg-tertiary);
    padding: 4px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-secondary);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    border: none;
    background: transparent;
    color: var(--text-tertiary);
    font-family: var(--font-arabic);
    font-size: var(--text-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.nav-link svg {
    width: 18px; height: 18px;
    flex-shrink: 0;
}

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

.nav-link.active {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 15px rgba(108, 99, 255, 0.4);
}

.nav-right {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

/* Theme Toggle */
.theme-toggle {
    width: 40px; height: 40px;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-secondary);
    background: var(--bg-tertiary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.theme-toggle:hover {
    border-color: var(--primary);
    transform: rotate(15deg);
}

.theme-toggle svg {
    width: 20px; height: 20px;
    position: absolute;
    transition: all var(--transition-base);
}

.sun-icon { color: #FFD600; }
.moon-icon { color: #B4B4D0; }

[data-theme="dark"] .sun-icon { opacity: 0; transform: scale(0) rotate(90deg); }
[data-theme="dark"] .moon-icon { opacity: 1; transform: scale(1) rotate(0); }
[data-theme="light"] .sun-icon { opacity: 1; transform: scale(1) rotate(0); }
[data-theme="light"] .moon-icon { opacity: 0; transform: scale(0) rotate(-90deg); }

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    border: none;
    background: none;
    cursor: pointer;
}

.mobile-menu-btn span {
    width: 22px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

.mobile-menu-btn.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.mobile-menu-btn.active span:nth-child(2) { opacity: 0; }
.mobile-menu-btn.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* Mobile Menu Sidebar */
.mobile-menu {
    position: fixed;
    top: 64px;
    right: 0;
    bottom: 0;
    width: 280px;
    background: var(--bg-nav);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-left: 1px solid var(--border-secondary);
    padding: var(--space-4);
    display: flex !important; /* Force display for transform logic */
    flex-direction: column;
    gap: var(--space-2);
    z-index: 1000;
    transform: translateX(100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow-y: auto;
}

.mobile-menu.active {
    transform: translateX(0);
}

.mobile-nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font-arabic);
    font-size: var(--text-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    width: 100%;
    text-align: right;
}

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

.mobile-menu-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--border-secondary);
    margin-bottom: var(--space-4);
}

.mobile-menu-header h3 {
    font-size: var(--text-lg);
    font-family: var(--font-arabic);
    color: var(--text-primary);
}

.close-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

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

/* ============================================
   MAIN CONTENT
   ============================================ */
.main-content {
    position: relative;
    z-index: 1;
    padding-top: 64px;
    min-height: 100vh;
}

.section {
    display: none;
    animation: fadeIn 0.4s ease;
}

.section.active {
    display: block;
}

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

.section-header {
    text-align: center;
    padding: var(--space-12) var(--space-6) var(--space-8);
}

.section-header h2 {
    font-size: var(--text-3xl);
    font-weight: 800;
    font-family: var(--font-arabic);
    margin-bottom: var(--space-2);
}

.section-header p {
    color: var(--text-secondary);
    font-size: var(--text-lg);
    font-family: var(--font-arabic);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--space-16) var(--space-6);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-12);
    align-items: center;
    min-height: calc(100vh - 64px - 200px);
}

.hero-content, .hero-visual {
    min-width: 0;
    max-width: 100%;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-xl);
    font-size: var(--text-sm);
    color: var(--text-secondary);
    font-family: var(--font-arabic);
    font-weight: 500;
    margin-bottom: var(--space-6);
    backdrop-filter: blur(10px);
}

.badge-dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--success);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.hero-title {
    font-size: var(--text-5xl);
    font-weight: 900;
    line-height: 1.15;
    margin-bottom: var(--space-6);
    font-family: var(--font-arabic);
}

.title-line {
    display: block;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-family: var(--font-primary);
}

.hero-desc {
    font-size: var(--text-lg);
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--space-8);
    font-family: var(--font-arabic);
    max-width: 550px;
}

.hero-actions {
    display: flex;
    gap: var(--space-4);
    flex-wrap: wrap;
}

/* Code Window */
.code-window {
    background: var(--bg-code);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl), var(--shadow-glow);
    border: 1px solid rgba(108, 99, 255, 0.2);
    animation: floatSlow 6s ease-in-out infinite;
}

@keyframes floatSlow {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.code-header {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-3) var(--space-4);
    background: rgba(0,0,0,0.3);
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.code-dots {
    display: flex;
    gap: 6px;
}

.dot {
    width: 12px; height: 12px;
    border-radius: 50%;
}

.dot.red { background: #FF5F56; }
.dot.yellow { background: #FFBD2E; }
.dot.green { background: #27C93F; }

.code-filename {
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    color: rgba(255,255,255,0.5);
}

.code-body {
    padding: var(--space-6);
    overflow-x: auto;
}

.code-body code {
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    line-height: 1.8;
    color: #E0E0FF;
    white-space: pre;
}

.code-body .kw { color: #C792EA; }
.code-body .cls { color: #FFCB6B; }
.code-body .fn { color: #82AAFF; }
.code-body .str { color: #C3E88D; }
.code-body .cmt { color: #546E7A; font-style: italic; }
.code-body .num { color: #F78C6C; }

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-md);
    border: none;
    font-family: var(--font-arabic);
    font-size: var(--text-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
    line-height: 1.4;
}

.btn svg {
    width: 18px; height: 18px;
    flex-shrink: 0;
}

.btn-sm { padding: var(--space-2) var(--space-4); font-size: var(--text-xs); }
.btn-lg { padding: var(--space-4) var(--space-8); font-size: var(--text-base); }

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 15px rgba(108, 99, 255, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(108, 99, 255, 0.5);
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-secondary);
}

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

.btn-success {
    background: var(--gradient-success);
    color: white;
    box-shadow: 0 4px 15px rgba(0, 200, 83, 0.3);
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 200, 83, 0.4);
}

.btn-accent {
    background: var(--gradient-accent);
    color: white;
}

.btn-accent:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(255,107,53,0.4);
}

.btn-danger {
    background: var(--danger);
    color: white;
}

/* ============================================
   QUICK STATS
   ============================================ */
.quick-stats {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6) var(--space-12);
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-4);
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-secondary);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    text-align: center;
    backdrop-filter: blur(10px);
    transition: all var(--transition-base);
}

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

.stat-icon {
    font-size: var(--text-3xl);
    margin-bottom: var(--space-2);
}

.stat-value {
    display: block;
    font-size: var(--text-3xl);
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-family: var(--font-arabic);
    font-size: var(--text-sm);
    color: var(--text-tertiary);
    font-weight: 500;
}

/* ============================================
   WEEKS GRID
   ============================================ */
.weeks-grid {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6) var(--space-16);
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-4);
}

.week-card {
    background: var(--bg-card);
    border: 1px solid var(--border-secondary);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.week-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 4px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.week-card:hover {
    transform: translateY(-6px);
    border-color: var(--border-primary);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

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

.week-card-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px; height: 48px;
    border-radius: var(--radius-lg);
    background: var(--gradient-primary);
    color: white;
    font-weight: 800;
    font-size: var(--text-lg);
    margin-bottom: var(--space-4);
    box-shadow: 0 4px 15px rgba(108, 99, 255, 0.3);
}

.week-card-title {
    font-family: var(--font-arabic);
    font-size: var(--text-lg);
    font-weight: 700;
    margin-bottom: var(--space-2);
    color: var(--text-primary);
}

.week-card-subtitle {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    margin-bottom: var(--space-3);
}

.week-card-topics {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-1);
}

.topic-tag {
    padding: 2px 10px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-secondary);
    border-radius: var(--radius-xl);
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    font-weight: 500;
}

/* ============================================
   WEEKS LAYOUT (Sidebar + Content)
   ============================================ */
.weeks-layout {
    width: 100%;
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 0;
    min-height: calc(100vh - 64px);
    transition: grid-template-columns 0.3s ease;
}

.weeks-layout.sidebar-hidden {
    grid-template-columns: 0 1fr;
}

.weeks-sidebar {
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-secondary);
    padding: var(--space-4);
    overflow-y: auto;
    overflow-x: hidden;
    height: calc(100vh - 64px);
    position: sticky;
    top: 64px;
    transition: all 0.3s ease;
}

.weeks-layout.sidebar-hidden .weeks-sidebar {
    padding: 0;
    opacity: 0;
    border-right: none;
}

.sidebar-header {
    padding: var(--space-4);
    border-bottom: 1px solid var(--border-secondary);
    margin-bottom: var(--space-4);
}

.sidebar-header h3 {
    font-family: var(--font-arabic);
    font-size: var(--text-lg);
    font-weight: 700;
}

.sidebar-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.sidebar-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font-arabic);
    font-size: var(--text-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    width: 100%;
    text-align: right;
}

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

.sidebar-item.active {
    background: rgba(108, 99, 255, 0.15);
    color: var(--primary);
    border-right: 3px solid var(--primary);
}

.sidebar-item-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px; height: 28px;
    border-radius: var(--radius-sm);
    background: var(--bg-tertiary);
    font-size: var(--text-xs);
    font-weight: 700;
    flex-shrink: 0;
}

.sidebar-item.active .sidebar-item-num {
    background: var(--primary);
    color: white;
}

/* Week Content Area */
.week-content {
    padding: var(--space-8);
    min-width: 0; /* Fixes grid blowout from long code blocks */
    max-width: 100%;
}

.week-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 50vh;
    text-align: center;
    color: var(--text-tertiary);
}

.placeholder-icon {
    font-size: 4rem;
    margin-bottom: var(--space-4);
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateX(0); }
    50% { transform: translateX(-10px); }
}

/* Week Content Styles */
.week-header {
    margin-bottom: var(--space-8);
    padding-bottom: var(--space-6);
    border-bottom: 1px solid var(--border-secondary);
}

.week-header h2 {
    font-size: var(--text-3xl);
    font-weight: 800;
    font-family: var(--font-arabic);
    margin-bottom: var(--space-2);
}

.week-header p {
    color: var(--text-secondary);
    font-size: var(--text-lg);
    font-family: var(--font-arabic);
}

.content-section {
    margin-bottom: var(--space-10);
}

.content-section h3 {
    font-size: var(--text-xl);
    font-weight: 700;
    font-family: var(--font-arabic);
    margin-bottom: var(--space-4);
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.content-section h4 {
    font-size: var(--text-lg);
    font-weight: 600;
    margin: var(--space-6) 0 var(--space-3);
    color: var(--text-primary);
    font-family: var(--font-arabic);
}

.content-text {
    font-family: var(--font-arabic);
    color: var(--text-secondary);
    line-height: 2;
    margin-bottom: var(--space-4);
}

.content-text.en {
    font-family: var(--font-primary);
    direction: ltr;
    text-align: left;
}

.content-text strong {
    color: var(--text-primary);
    font-weight: 700;
}

/* Code blocks in content */
.code-block {
    background: var(--bg-code);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    margin: var(--space-4) 0;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border: 1px solid rgba(108, 99, 255, 0.15);
    position: relative;
    width: 100%;
    max-width: 100%;
}

.code-block code {
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    line-height: 1.8;
    color: #E0E0FF;
    white-space: pre;
    direction: ltr;
    text-align: left;
    display: block;
}

.code-block .code-label {
    position: absolute;
    top: var(--space-2);
    right: var(--space-3);
    font-size: var(--text-xs);
    color: rgba(255,255,255,0.3);
    font-family: var(--font-mono);
}

/* Info boxes */
.info-box {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    margin: var(--space-4) 0;
    border-left: 4px solid var(--primary);
}

.info-box.warning {
    border-left-color: var(--warning);
}

.info-box.success {
    border-left-color: var(--success);
}

.info-box.danger {
    border-left-color: var(--danger);
}

.info-box h5 {
    font-family: var(--font-arabic);
    font-size: var(--text-base);
    font-weight: 700;
    margin-bottom: var(--space-2);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.info-box p {
    font-family: var(--font-arabic);
    color: var(--text-secondary);
    font-size: var(--text-sm);
    line-height: 1.8;
}

.content-table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--space-4) 0;
    font-size: var(--text-sm);
    direction: ltr;
    text-align: left;
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.content-table th,
.content-table td {
    padding: var(--space-3) var(--space-4);
    border: 1px solid var(--border-secondary);
}

.content-table th {
    background: var(--bg-tertiary);
    font-weight: 700;
    color: var(--primary);
}

.content-table td {
    color: var(--text-secondary);
}

.content-table tr:hover td {
    background: var(--bg-card);
}

/* ============================================
   QUIZ SECTION
   ============================================ */
.quiz-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 var(--space-6) var(--space-16);
}

.quiz-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: var(--space-4);
    padding: 0 var(--space-6);
}

.quiz-card {
    background: var(--bg-card);
    border: 1px solid var(--border-secondary);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    cursor: pointer;
    transition: all var(--transition-base);
    text-align: center;
    backdrop-filter: blur(10px);
}

.quiz-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent);
    box-shadow: 0 8px 30px rgba(255, 107, 53, 0.2);
}

.quiz-card-icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-3);
}

.quiz-card h4 {
    font-family: var(--font-arabic);
    font-size: var(--text-base);
    font-weight: 700;
    margin-bottom: var(--space-2);
}

.quiz-card p {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    font-family: var(--font-arabic);
}

.quiz-card .best-score {
    margin-top: var(--space-3);
    padding: var(--space-1) var(--space-3);
    background: var(--bg-tertiary);
    border-radius: var(--radius-xl);
    font-size: var(--text-xs);
    color: var(--success);
    font-weight: 600;
    display: inline-block;
}

/* Active Quiz */
.quiz-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    padding: var(--space-5);
    background: var(--bg-card);
    border: 1px solid var(--border-secondary);
    border-radius: var(--radius-xl);
    margin-bottom: var(--space-6);
    flex-wrap: wrap;
    backdrop-filter: blur(10px);
}

.quiz-info h3 {
    font-family: var(--font-arabic);
    font-size: var(--text-lg);
    font-weight: 700;
    margin-bottom: var(--space-2);
}

.quiz-progress {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: var(--text-sm);
    color: var(--text-tertiary);
    font-family: var(--font-arabic);
}

.progress-bar {
    width: 200px;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 3px;
    transition: width var(--transition-base);
    width: 0%;
}

.quiz-timer {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-family: var(--font-mono);
    font-size: var(--text-lg);
    color: var(--text-secondary);
}

.quiz-timer svg {
    width: 20px; height: 20px;
}

/* Question */
.quiz-question {
    background: var(--bg-card);
    border: 1px solid var(--border-secondary);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    margin-bottom: var(--space-4);
    backdrop-filter: blur(10px);
}

.question-badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-xl);
    font-size: var(--text-xs);
    font-weight: 600;
    margin-bottom: var(--space-4);
}

.question-badge.mcq {
    background: rgba(108, 99, 255, 0.15);
    color: var(--primary);
}

.question-badge.essay {
    background: rgba(255, 107, 53, 0.15);
    color: var(--accent);
}

.question-text {
    font-size: var(--text-lg);
    font-weight: 600;
    margin-bottom: var(--space-6);
    line-height: 1.8;
    direction: ltr;
    text-align: left;
}

.question-text.ar {
    direction: rtl;
    text-align: right;
    font-family: var(--font-arabic);
}

.question-code {
    background: var(--bg-code);
    padding: var(--space-4);
    border-radius: var(--radius-md);
    margin: var(--space-4) 0;
    overflow-x: auto;
}

.question-code code {
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    color: #E0E0FF;
    white-space: pre;
    direction: ltr;
}

/* MCQ Options */
.mcq-options {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.mcq-option {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    padding: var(--space-4);
    border-radius: var(--radius-md);
    border: 2px solid var(--border-secondary);
    background: var(--bg-input);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    direction: ltr;
    text-align: left;
}

.mcq-option:not(.disabled):not(.correct):not(.wrong):hover {
    border-color: var(--primary);
    background: rgba(108, 99, 255, 0.05);
}

.mcq-option.selected:not(.correct):not(.wrong) {
    border-color: var(--primary);
    background: rgba(108, 99, 255, 0.1);
}

.mcq-option.correct {
    border-color: var(--success);
    background: rgba(0, 200, 83, 0.1);
}

.mcq-option.wrong {
    border-color: var(--danger);
    background: rgba(255, 23, 68, 0.1);
}

.mcq-option.disabled {
    opacity: 0.7;
}

.option-letter {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 28px; height: 28px;
    border-radius: var(--radius-sm);
    background: var(--bg-tertiary);
    font-weight: 700;
    font-size: var(--text-xs);
    flex-shrink: 0;
}

.mcq-option.selected:not(.correct):not(.wrong) .option-letter {
    background: var(--primary);
    color: white;
}

.mcq-option.correct .option-letter {
    background: var(--success);
    color: white;
}

.mcq-option.wrong .option-letter {
    background: var(--danger);
    color: white;
}

/* Essay answer */
.essay-textarea {
    width: 100%;
    min-height: 150px;
    padding: var(--space-4);
    border: 2px solid var(--border-secondary);
    border-radius: var(--radius-md);
    background: var(--bg-input);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    line-height: 1.8;
    resize: vertical;
    direction: ltr;
    text-align: left;
    transition: border-color var(--transition-fast);
}

.essay-textarea:focus {
    outline: none;
    border-color: var(--primary);
}

/* Quiz Footer */
.quiz-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-4) 0;
    gap: var(--space-4);
}

/* Quiz Results */
.quiz-results {
    max-width: 800px;
    margin: 0 auto;
}

.results-header {
    text-align: center;
    padding: var(--space-10);
    background: var(--bg-card);
    border: 1px solid var(--border-secondary);
    border-radius: var(--radius-2xl);
    margin-bottom: var(--space-6);
    backdrop-filter: blur(10px);
}

.result-emoji {
    font-size: 4rem;
    margin-bottom: var(--space-4);
}

.result-score {
    font-size: var(--text-5xl);
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--space-2);
}

.result-label {
    font-family: var(--font-arabic);
    font-size: var(--text-lg);
    color: var(--text-secondary);
    margin-bottom: var(--space-6);
}

.result-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-8);
    flex-wrap: wrap;
}

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

.result-stat-value {
    display: block;
    font-size: var(--text-2xl);
    font-weight: 800;
}

.result-stat-label {
    font-family: var(--font-arabic);
    font-size: var(--text-sm);
    color: var(--text-tertiary);
}

.results-actions {
    display: flex;
    justify-content: center;
    gap: var(--space-4);
    margin-top: var(--space-6);
}

.results-review {
    margin-top: var(--space-8);
}

.results-review h3 {
    font-family: var(--font-arabic);
    font-size: var(--text-xl);
    font-weight: 700;
    margin-bottom: var(--space-4);
}

.review-item {
    background: var(--bg-card);
    border: 1px solid var(--border-secondary);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    margin-bottom: var(--space-4);
}

.review-item.correct { border-left: 4px solid var(--success); }
.review-item.wrong { border-left: 4px solid var(--danger); }

.review-question {
    font-weight: 600;
    margin-bottom: var(--space-3);
    direction: ltr;
    text-align: left;
}

.review-answer {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    direction: ltr;
    text-align: left;
}

.review-correct {
    color: var(--success);
    font-weight: 600;
}

.review-wrong {
    color: var(--danger);
    text-decoration: line-through;
}

/* ============================================
   STATS SECTION
   ============================================ */
.stats-dashboard {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6) var(--space-16);
}

.stats-overview {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-4);
    margin-bottom: var(--space-8);
}

.overview-card {
    background: var(--bg-card);
    border: 1px solid var(--border-secondary);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    display: flex;
    align-items: center;
    gap: var(--space-4);
    backdrop-filter: blur(10px);
    transition: all var(--transition-base);
}

.overview-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.overview-icon {
    font-size: 2rem;
}

.overview-value {
    display: block;
    font-size: var(--text-2xl);
    font-weight: 800;
}

.overview-label {
    font-family: var(--font-arabic);
    font-size: var(--text-sm);
    color: var(--text-tertiary);
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
    margin-bottom: var(--space-6);
}

.stats-chart-card {
    background: var(--bg-card);
    border: 1px solid var(--border-secondary);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    backdrop-filter: blur(10px);
}

.stats-chart-card h4 {
    font-family: var(--font-arabic);
    font-size: var(--text-base);
    font-weight: 700;
    margin-bottom: var(--space-6);
}

/* Chart */
.chart-container {
    display: flex;
    align-items: flex-end;
    gap: var(--space-2);
    height: 200px;
    padding: var(--space-4) 0;
}

.chart-bar-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    height: 100%;
    justify-content: flex-end;
}

.chart-bar {
    width: 100%;
    max-width: 40px;
    min-height: 4px;
    background: var(--gradient-primary);
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    transition: height var(--transition-slow);
    position: relative;
}

.chart-bar:hover {
    filter: brightness(1.2);
}

.chart-bar-label {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    font-weight: 600;
    writing-mode: horizontal-tb;
    white-space: nowrap;
}

.chart-bar-value {
    font-size: var(--text-xs);
    font-weight: 700;
    color: var(--primary);
}

/* History */
.history-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    max-height: 300px;
    overflow-y: auto;
}

.history-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3) var(--space-4);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
}

.history-item-title {
    font-family: var(--font-arabic);
    font-weight: 600;
}

.history-item-score {
    font-weight: 700;
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-xl);
    font-size: var(--text-xs);
}

.history-item-score.high { background: rgba(0,200,83,0.15); color: var(--success); }
.history-item-score.mid { background: rgba(255,214,0,0.15); color: var(--warning); }
.history-item-score.low { background: rgba(255,23,68,0.15); color: var(--danger); }

.history-item-date {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
}

.empty-state {
    text-align: center;
    padding: var(--space-10);
    color: var(--text-tertiary);
}

.empty-state span {
    font-size: 2.5rem;
    display: block;
    margin-bottom: var(--space-3);
}

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

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-secondary);
    padding: var(--space-8) var(--space-6);
    text-align: center;
    position: relative;
    z-index: 1;
}

.footer p {
    font-family: var(--font-arabic);
    font-size: var(--text-sm);
    color: var(--text-tertiary);
    line-height: 1.8;
}

.footer-credit {
    font-size: var(--text-xs);
    margin-top: var(--space-2);
    color: var(--text-muted);
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
.hidden { display: none !important; }

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

/* Week content action bar */
.week-actions {
    display: flex;
    gap: var(--space-3);
    margin-top: var(--space-6);
    flex-wrap: wrap;
}

/* ============================================
   GLOBAL ANIMATIONS
   ============================================ */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes pulseSoft {
    0% { box-shadow: 0 0 0 0 rgba(108, 99, 255, 0.4); }
    70% { box-shadow: 0 0 0 10px rgba(108, 99, 255, 0); }
    100% { box-shadow: 0 0 0 0 rgba(108, 99, 255, 0); }
}

.section.active {
    animation: fadeInUp 0.5s ease forwards;
}

.week-card {
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.3s ease;
}

.week-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 15px 30px rgba(0,0,0,0.1);
}

.quiz-card {
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.3s ease;
}

.quiz-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 15px 30px rgba(0,0,0,0.1);
}

.btn-primary {
    transition: all 0.3s ease;
}

.btn-primary:hover {
    animation: pulseSoft 1.5s infinite;
    transform: translateY(-2px);
}

.sidebar-item {
    transition: all 0.3s ease, padding-right 0.3s ease;
}

.sidebar-item:hover {
    padding-right: var(--space-6);
}

.overview-card {
    transition: transform 0.3s ease;
}

.overview-card:hover {
    transform: translateY(-5px);
}

@media (max-width: 1024px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
        padding: var(--space-10) var(--space-4);
        min-height: auto;
    }
    
    .hero-desc { max-width: 100%; }
    .hero-actions { justify-content: center; }
    .hero-visual { order: -1; }
    
    .code-window { max-width: 100%; margin: 0 auto; }
    
    .quick-stats { grid-template-columns: repeat(2, 1fr); }
    
    .weeks-layout {
        grid-template-columns: 1fr;
    }
    
    #desktop-sidebar-close, #desktop-sidebar-open {
        display: none !important;
    }
    
    .weeks-sidebar {
        display: none;
    }
    
    .stats-overview { grid-template-columns: repeat(2, 1fr); }
    .stats-grid { grid-template-columns: 1fr; }
}

/* Force LTR for all code blocks to fix punctuation placement */
.code-block, pre, code, .code-window {
    direction: ltr !important;
    text-align: left !important;
}

@media (max-width: 768px) {
    :root {
        --text-5xl: 2.25rem;
        --text-4xl: 1.875rem;
        --text-3xl: 1.5rem;
    }
    
    .nav-center { display: none; }
    .mobile-menu-btn { display: flex; }
    
    .mobile-menu {
        display: flex;
    }
    
    .brand-title {
        font-size: 1.1rem;
    }
    
    .brand-subtitle {
        font-size: 0.65rem;
    }
    
    .hero-title {
        font-size: var(--text-3xl);
        line-height: 1.4;
    }
    
    .quick-stats { grid-template-columns: repeat(2, 1fr); gap: var(--space-3); }
    .stat-card { padding: var(--space-4); }
    .stat-value { font-size: var(--text-2xl); }
    
    .weeks-grid { grid-template-columns: 1fr; }
    
    .quiz-grid { grid-template-columns: repeat(2, 1fr); }
    
    .quiz-header { flex-direction: column; text-align: center; }
    .progress-bar { width: 100%; }
    
    .quiz-footer { flex-direction: column; }
    
    .result-stats { flex-direction: column; gap: var(--space-4); }
    
    .stats-overview { grid-template-columns: 1fr 1fr; gap: var(--space-3); }
    .overview-card { flex-direction: column; text-align: center; padding: var(--space-4); }
    
    .week-content { padding: var(--space-4); }
}

@media (max-width: 480px) {
    .hero { padding: var(--space-8) var(--space-4); }
    .hero-title { font-size: var(--text-2xl); }
    .hero-desc { font-size: var(--text-base); }
    
    .quick-stats { grid-template-columns: 1fr; }
    
    .quiz-grid { grid-template-columns: 1fr; }
    
    .quiz-question { padding: var(--space-5); }
    
    .hero-actions { flex-direction: column; width: 100%; }
    .hero-actions .btn { width: 100%; }
    
    .results-actions { flex-direction: column; }
    .results-actions .btn { width: 100%; }
    
    .quiz-footer { flex-direction: column; width: 100%; gap: var(--space-3); }
    .quiz-footer .btn { width: 100%; justify-content: center; }

    .stats-overview { grid-template-columns: 1fr; }
}