/* 
 * Exam Platform - Premium Core Design System
 * Focus: High-end Aesthetics, Glassmorphism, Micro-animations, Professional RTL Support
 */

@import url('https://fonts.googleapis.com/css2?family=Cairo:wght@300;400;500;600;700;800&family=Outfit:wght@300;400;500;600;700;800&display=swap');

:root {
    /* Color Palette - Indigo & Slate */
    --primary: #6366f1;
    --primary-light: #818cf8;
    --primary-dark: #4f46e5;
    --primary-soft: rgba(99, 102, 241, 0.1);
    
    --secondary: #64748b;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #0ea5e9;
    
    --dark: #0f172a;
    --slate-900: #0f172a;
    --slate-800: #1e293b;
    --slate-700: #334155;
    --slate-600: #475569;
    --slate-500: #64748b;
    --slate-400: #94a3b8;
    --slate-300: #cbd5e1;
    --slate-200: #e2e8f0;
    --slate-100: #f1f5f9;
    --slate-50:  #f8fafc;
    
    --white: #ffffff;
    --bg-body: #f8fafc;
    
    /* Functional Tokens */
    --font-heading: 'Outfit', 'Cairo', sans-serif;
    --font-body: 'Cairo', 'Outfit', sans-serif;
    
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-2xl: 2rem;
    --radius-full: 9999px;
    
    --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    --shadow-primary: 0 10px 15px -3px rgba(99, 102, 241, 0.3);
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --sidebar-width: 280px;
}

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

body {
    font-family: var(--font-body);
    background-color: var(--bg-body);
    color: var(--slate-800);
    line-height: 1.6;
    overflow-x: hidden;
    direction: rtl;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--slate-900);
    font-weight: 700;
}

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

a:hover {
    color: var(--primary-dark);
}

/* Glassmorphism & Cards */
.glass {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.4);
    box-shadow: var(--shadow-lg);
}

.glass-card {
    border-radius: var(--radius-xl);
    padding: 2rem;
    transition: var(--transition);
    background: var(--white);
    border: 1px solid var(--slate-100);
}

.glass-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

/* Custom Buttons */
.btn {
    padding: 0.6rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
    border: 1px solid transparent;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    box-shadow: var(--shadow-primary);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 20px -5px rgba(99, 102, 241, 0.4);
    color: white;
}

.btn-light {
    background: var(--white);
    border-color: var(--slate-200);
    color: var(--slate-700);
}

.btn-light:hover {
    background: var(--slate-50);
    border-color: var(--slate-300);
}

/* Badges */
.badge {
    padding: 0.4em 0.8em;
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 0.75rem;
}

.badge-primary-soft { background: var(--primary-soft); color: var(--primary); }
.badge-success-soft { background: rgba(16, 185, 129, 0.1); color: var(--success); }
.badge-danger-soft { background: rgba(239, 68, 68, 0.1); color: var(--danger); }

/* Layout Structure */
.app-container {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: var(--sidebar-width);
    background: var(--slate-900);
    color: white;
    height: 100vh;
    position: fixed;
    right: 0;
    top: 0;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    padding: 2rem 1.5rem;
    transition: var(--transition);
}

.main-wrapper {
    flex: 1;
    margin-right: var(--sidebar-width);
    transition: var(--transition);
    min-width: 0;
}

.main-content {
    padding: 1.5rem;
    max-width: 1400px;
    margin: 0 auto;
}

@media (min-width: 768px) {
    .main-content {
        padding: 2.5rem;
    }
}

@media (max-width: 991.98px) {
    .sidebar {
        right: calc(var(--sidebar-width) * -1);
    }
    .main-wrapper {
        margin-right: 0;
    }
    .sidebar.active {
        right: 0;
    }
}

/* Table Enhancements */
.custom-table {
    border-collapse: separate;
    border-spacing: 0 0.75rem;
}

.custom-table tr {
    background: white;
    border-radius: var(--radius-lg);
    transition: var(--transition);
}

.custom-table td {
    padding: 1.25rem 1rem;
    border-top: 1px solid var(--slate-100);
    border-bottom: 1px solid var(--slate-100);
}

.custom-table td:first-child {
    border-right: 1px solid var(--slate-100);
    border-top-right-radius: var(--radius-lg);
    border-bottom-right-radius: var(--radius-lg);
}

.custom-table td:last-child {
    border-left: 1px solid var(--slate-100);
    border-top-left-radius: var(--radius-lg);
    border-bottom-left-radius: var(--radius-lg);
}

.custom-table tr:hover {
    transform: scale(1.01);
    box-shadow: var(--shadow-md);
}

/* Utils */
.text-gradient {
    background: linear-gradient(135deg, var(--slate-900) 0%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.animate-fade-up {
    animation: fadeUp 0.6s ease-out forwards;
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Sidebar Links */
.nav-link {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.8rem 1rem;
    border-radius: var(--radius-md);
    color: var(--slate-400);
    font-weight: 500;
    margin-bottom: 0.5rem;
    transition: var(--transition);
}

.nav-link:hover, .nav-link.active {
    background: rgba(255, 255, 255, 0.1);
    color: white;
}

.nav-link.active {
    background: var(--primary);
    box-shadow: var(--shadow-primary);
}

.nav-link i {
    font-size: 1.25rem;
}

/* Custom Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--slate-100); }
::-webkit-scrollbar-thumb { background: var(--slate-300); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: var(--primary-light); }

/* --- Responsive & Mobile Improvements --- */

/* Hero & Typography adjustments */
@media (max-width: 991.98px) {
    .display-3 { font-size: 2.5rem !important; }
    .hero { padding-top: 2rem !important; padding-bottom: 2rem !important; }
}

@media (max-width: 767.98px) {
    .display-3 { font-size: 2rem !important; }
    .lead { font-size: 1rem !important; }
    
    .hero {
        text-align: center;
        padding-top: 3rem !important;
    }
    
    .hero .d-flex {
        justify-content: center;
    }
    
    .glass-card {
        padding: 1.25rem !important;
    }

    /* Prevent horizontal scrolling on public pages */
    body.public-bg {
        overflow-x: hidden !important;
        position: relative;
    }

    .container {
        padding-left: 1.5rem !important;
        padding-right: 1.5rem !important;
    }
}

@media (max-width: 575.98px) {
    .display-3 { font-size: 1.75rem !important; }
    
    .hero-image-container {
        margin-top: 1.5rem;
    }
    
    /* Horizontal scrolling for grade pills menu on mobile */
    .nav-pills-container {
        overflow-x: auto;
        white-space: nowrap;
        padding: 0.5rem !important;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
    }
    
    .nav-pills-container::-webkit-scrollbar {
        display: none;
    }
    
    .nav-pills-container .nav {
        flex-wrap: nowrap;
    }
    
    .nav-link {
        font-size: 0.85rem;
        padding: 0.5rem 1rem !important;
    }
}

/* Ensure no element breaks the container width */
img, video, canvas, svg {
    max-width: 100%;
    height: auto;
}

.w-100-mobile {
    @media (max-width: 575.98px) {
        width: 100% !important;
    }
}

/* --- Glowing Titles System --- */
.title-glow {
    position: relative;
    font-weight: 700;
    padding: 0.2rem 0.8rem;
    border-radius: var(--radius-full);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    animation: titlePulse 2s infinite ease-in-out;
}

@keyframes titlePulse {
    0% { transform: scale(1); filter: brightness(1); }
    50% { transform: scale(1.05); filter: brightness(1.2); }
    100% { transform: scale(1); filter: brightness(1); }
}

.avatar-container {
    position: relative;
    display: inline-block;
}

.avatar-glow {
    position: absolute;
    top: -5px;
    left: -5px;
    right: -5px;
    bottom: -5px;
    border-radius: 50%;
    z-index: -1;
    filter: blur(10px);
    opacity: 0.5;
    animation: glowPulse 3s infinite alternate;
}

@keyframes glowPulse {
    from { opacity: 0.3; transform: scale(0.95); }
    to { opacity: 0.7; transform: scale(1.05); }
}

/* --- Duel Matchmaking Animations --- */
.bg-gradient-duel {
    background: linear-gradient(135deg, #f43f5e 0%, #fb923c 100%);
    position: relative;
}

.bg-gradient-duel::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at top right, rgba(255,255,255,0.2), transparent);
}