/* ============================================
   QuizNova - Premium Smart Quiz Platform
   ============================================ */

/* ================== CSS VARIABLES ================== */
:root {
    /* Primary Colors */
    --primary: #6366f1;
    --primary-light: #818cf8;
    --primary-dark: #4f46e5;
    --secondary: #ec4899;
    --secondary-light: #f472b6;
    
    /* Neon Colors */
    --neon-blue: #00d4ff;
    --neon-purple: #a855f7;
    --neon-pink: #ff006e;
    --neon-green: #00ff88;
    --neon-orange: #ff9500;
    
    /* Dark Theme */
    --bg-dark: #0a0a0f;
    --bg-dark-secondary: #12121a;
    --bg-dark-tertiary: #1a1a25;
    --bg-card: rgba(255, 255, 255, 0.05);
    --bg-card-hover: rgba(255, 255, 255, 0.1);
    
    /* Light Theme */
    --bg-light: #f8fafc;
    --bg-light-secondary: #f1f5f9;
    --bg-card-light: #ffffff;
    
    /* Text Colors */
    --text-dark: #ffffff;
    --text-dark-secondary: #94a3b8;
    --text-light: #1e293b;
    --text-light-secondary: #64748b;
    
    /* Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 50%;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Z-index */
    --z-base: 1;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-modal: 300;
    --z-tooltip: 400;
}

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

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Dark Theme (Default) */
body {
    background-color: var(--bg-dark);
    color: var(--text-dark);
}

body.light-mode {
    background-color: var(--bg-light);
    color: var(--text-light);
}

/* ================== TYPOGRAPHY ================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: 3.5rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

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

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

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

/* ================== ANIMATED GRADIENTS ================== */
.gradient-text {
    background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple), var(--neon-pink));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientShift 5s ease infinite;
    background-size: 200% 200%;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.gradient-bg {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    background-size: 200% 200%;
    animation: gradientShift 5s ease infinite;
}

/* ================== GLASSMORPHISM ================== */
.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--glass-shadow);
}

.glass-card {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
}

.glass-card:hover {
    background: var(--bg-card-hover);
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

body.light-mode .glass-card {
    background: var(--bg-card-light);
    border: 1px solid rgba(0, 0, 0, 0.1);
}

body.light-mode .glass-card:hover {
    background: #ffffff;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

/* ================== BUTTONS ================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.6);
}

.btn-secondary {
    background: linear-gradient(135deg, var(--secondary), var(--secondary-light));
    color: white;
    box-shadow: 0 4px 15px rgba(236, 72, 153, 0.4);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(236, 72, 153, 0.6);
}

.btn-neon {
    background: transparent;
    color: var(--neon-blue);
    border: 2px solid var(--neon-blue);
    box-shadow: 0 0 20px rgba(0, 212, 255, 0.3);
}

.btn-neon:hover {
    background: var(--neon-blue);
    color: var(--bg-dark);
    box-shadow: 0 0 40px rgba(0, 212, 255, 0.6);
}

.btn-ghost {
    background: transparent;
    color: var(--text-dark-secondary);
    border: 2px solid transparent;
}

body.light-mode .btn-ghost {
    color: var(--text-light-secondary);
}

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

body.light-mode .btn-ghost:hover {
    color: var(--text-light);
    background: var(--bg-light-secondary);
}

.btn-success {
    background: linear-gradient(135deg, var(--neon-green), #00cc6a);
    color: var(--bg-dark);
}

.btn-danger {
    background: linear-gradient(135deg, #ff4757, #ff6b7a);
    color: white;
}

.btn-lg {
    padding: 1rem 2.5rem;
    font-size: 1.125rem;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-icon {
    width: 48px;
    height: 48px;
    padding: 0;
    border-radius: var(--radius-full);
}

/* ================== FORM ELEMENTS ================== */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-dark-secondary);
}

body.light-mode .form-label {
    color: var(--text-light-secondary);
}

.form-input {
    width: 100%;
    padding: 0.875rem 1rem;
    font-size: 1rem;
    background: var(--bg-dark-tertiary);
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    color: var(--text-dark);
    transition: all var(--transition-normal);
}

body.light-mode .form-input {
    background: var(--bg-light-secondary);
    color: var(--text-light);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.2);
}

.form-input::placeholder {
    color: var(--text-dark-secondary);
}

body.light-mode .form-input::placeholder {
    color: var(--text-light-secondary);
}

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1rem;
    padding-right: 3rem;
}

/* ================== CARDS ================== */
.card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition-normal);
}

.card-hover:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

body.light-mode .card {
    background: var(--bg-card-light);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

body.light-mode .card-hover:hover {
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

/* ================== MODAL ================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

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

.modal {
    background: var(--bg-dark-secondary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.9) translateY(20px);
    transition: all var(--transition-normal);
    border: 1px solid var(--glass-border);
}

body.light-mode .modal {
    background: var(--bg-light);
}

.modal-overlay.active .modal {
    transform: scale(1) translateY(0);
}

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

.modal-close {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border: none;
    border-radius: var(--radius-full);
    color: var(--text-dark-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--bg-card-hover);
    color: var(--text-dark);
}

/* ================== NAVIGATION ================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    z-index: var(--z-sticky);
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(20px);
    padding: 0.75rem 2rem;
}

body.light-mode .navbar.scrolled {
    background: rgba(248, 250, 252, 0.9);
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-dark);
}

body.light-mode .navbar-brand {
    color: var(--text-light);
}

.navbar-logo {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.navbar-menu {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav-link {
    padding: 0.5rem 1rem;
    color: var(--text-dark-secondary);
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

body.light-mode .nav-link {
    color: var(--text-light-secondary);
}

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

body.light-mode .nav-link:hover, 
body.light-mode .nav-link.active {
    color: var(--text-light);
    background: var(--bg-light-secondary);
}

/* ================== SIDEBAR ================== */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: 280px;
    height: 100vh;
    background: var(--bg-dark-secondary);
    padding: 2rem 1rem;
    z-index: var(--z-sticky);
    transition: all var(--transition-normal);
    border-right: 1px solid var(--glass-border);
}

body.light-mode .sidebar {
    background: var(--bg-light);
    border-right: 1px solid rgba(0, 0, 0, 0.1);
}

.sidebar-menu {
    list-style: none;
    margin-top: 2rem;
}

.sidebar-item {
    margin-bottom: 0.5rem;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.875rem 1rem;
    color: var(--text-dark-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

body.light-mode .sidebar-link {
    color: var(--text-light-secondary);
}

.sidebar-link:hover, .sidebar-link.active {
    color: var(--text-dark);
    background: var(--bg-card);
}

body.light-mode .sidebar-link:hover,
body.light-mode .sidebar-link.active {
    color: var(--text-light);
    background: var(--bg-light-secondary);
}

.sidebar-link-icon {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ================== MAIN CONTENT ================== */
.main-content {
    margin-left: 280px;
    min-height: 100vh;
    padding: 2rem;
    transition: margin var(--transition-normal);
}

.page {
    display: none;
    animation: fadeIn 0.5s ease;
}

.page.active {
    display: block;
}

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

/* ================== HERO SECTION ================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    padding: 2rem;
}

.hero-title {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-dark-secondary);
    margin-bottom: 2.5rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

body.light-mode .hero-subtitle {
    color: var(--text-light-secondary);
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* ================== PARTICLE BACKGROUND ================== */
#particles-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
}

/* ================== QUIZ MODE CARDS ================== */
.mode-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.mode-card {
    padding: 2rem;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.mode-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-normal);
}

.mode-card:hover::before {
    transform: scaleX(1);
}

.mode-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin-bottom: 1rem;
}

.mode-title {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.mode-description {
    color: var(--text-dark-secondary);
    font-size: 0.875rem;
}

body.light-mode .mode-description {
    color: var(--text-light-secondary);
}

.mode-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    background: var(--neon-green);
    color: var(--bg-dark);
}

/* ================== QUIZ INTERFACE ================== */
.quiz-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
}

.quiz-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.quiz-progress {
    flex: 1;
    min-width: 200px;
}

.quiz-progress-bar {
    height: 8px;
    background: var(--bg-dark-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-top: 0.5rem;
}

body.light-mode .quiz-progress-bar {
    background: var(--bg-light-secondary);
}

.quiz-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: var(--radius-full);
    transition: width var(--transition-normal);
}

.quiz-timer {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.timer-ring {
    width: 60px;
    height: 60px;
    position: relative;
}

.timer-ring svg {
    transform: rotate(-90deg);
}

.timer-ring-bg {
    fill: none;
    stroke: var(--bg-dark-tertiary);
    stroke-width: 4;
}

body.light-mode .timer-ring-bg {
    stroke: var(--bg-light-secondary);
}

.timer-ring-progress {
    fill: none;
    stroke: var(--neon-green);
    stroke-width: 4;
    stroke-linecap: round;
    transition: stroke-dashoffset 1s linear;
}

.timer-ring-progress.warning {
    stroke: var(--neon-orange);
}

.timer-ring-progress.danger {
    stroke: var(--neon-pink);
}

.timer-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 1rem;
    font-weight: 700;
}

.quiz-stats {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

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

.quiz-stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--neon-blue);
}

.quiz-stat-label {
    font-size: 0.75rem;
    color: var(--text-dark-secondary);
    text-transform: uppercase;
}

body.light-mode .quiz-stat-label {
    color: var(--text-light-secondary);
}

/* ================== QUESTION CARD ================== */
.question-card {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: 2rem;
    margin-bottom: 2rem;
    border: 1px solid var(--glass-border);
}

body.light-mode .question-card {
    background: var(--bg-card-light);
}

.question-number {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--primary);
    color: white;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.question-category {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--bg-card-hover);
    color: var(--text-dark-secondary);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    margin-left: 0.5rem;
}

body.light-mode .question-category {
    color: var(--text-light-secondary);
}

.question-text {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.question-image {
    max-width: 100%;
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
}

.question-code {
    background: var(--bg-dark-tertiary);
    border-radius: var(--radius-md);
    padding: 1rem;
    font-family: 'Fira Code', monospace;
    font-size: 0.875rem;
    overflow-x: auto;
    margin-bottom: 1.5rem;
    border: 1px solid var(--glass-border);
}

body.light-mode .question-code {
    background: var(--bg-light-secondary);
}

/* ================== ANSWER OPTIONS ================== */
.answers-grid {
    display: grid;
    gap: 1rem;
}

.answer-option {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.25rem;
    background: var(--bg-dark-tertiary);
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
}

body.light-mode .answer-option {
    background: var(--bg-light-secondary);
}

.answer-option:hover {
    border-color: var(--primary);
    transform: translateX(4px);
}

.answer-option.selected {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.1);
}

.answer-option.correct {
    border-color: var(--neon-green);
    background: rgba(0, 255, 136, 0.1);
}

.answer-option.incorrect {
    border-color: var(--neon-pink);
    background: rgba(255, 0, 110, 0.1);
}

.answer-letter {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border-radius: var(--radius-full);
    font-weight: 700;
    flex-shrink: 0;
}

body.light-mode .answer-letter {
    background: var(--bg-card-light);
}

.answer-option.correct .answer-letter {
    background: var(--neon-green);
    color: var(--bg-dark);
}

.answer-option.incorrect .answer-letter {
    background: var(--neon-pink);
    color: white;
}

.answer-text {
    flex: 1;
}

/* ================== LIFELINES ================== */
.lifelines {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.lifeline-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-full);
    color: var(--text-dark-secondary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition-normal);
}

body.light-mode .lifeline-btn {
    background: var(--bg-card-light);
    color: var(--text-light-secondary);
}

.lifeline-btn:hover:not(:disabled) {
    background: var(--bg-card-hover);
    color: var(--text-dark);
    border-color: var(--primary);
}

body.light-mode .lifeline-btn:hover:not(:disabled) {
    background: var(--bg-light-secondary);
    color: var(--text-light);
}

.lifeline-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.lifeline-btn.used {
    background: var(--bg-dark-tertiary);
    color: var(--text-dark-secondary);
}

body.light-mode .lifeline-btn.used {
    background: var(--bg-light-secondary);
}

.lifeline-icon {
    font-size: 1.25rem;
}

/* ================== QUIZ ACTIONS ================== */
.quiz-actions {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}

/* ================== RESULTS PAGE ================== */
.results-container {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.results-score {
    margin-bottom: 2rem;
}

.score-circle {
    width: 200px;
    height: 200px;
    margin: 0 auto 1.5rem;
    position: relative;
}

.score-circle svg {
    transform: rotate(-90deg);
}

.score-circle-bg {
    fill: none;
    stroke: var(--bg-dark-tertiary);
    stroke-width: 12;
}

body.light-mode .score-circle-bg {
    stroke: var(--bg-light-secondary);
}

.score-circle-progress {
    fill: none;
    stroke: url(#scoreGradient);
    stroke-width: 12;
    stroke-linecap: round;
    stroke-dasharray: 565.48;
    stroke-dashoffset: 565.48;
    transition: stroke-dashoffset 1.5s ease;
}

.score-value {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 3rem;
    font-weight: 700;
}

.score-label {
    font-size: 1.25rem;
    color: var(--text-dark-secondary);
}

body.light-mode .score-label {
    color: var(--text-light-secondary);
}

.results-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.result-stat {
    padding: 1.5rem;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--glass-border);
}

body.light-mode .result-stat {
    background: var(--bg-card-light);
}

.result-stat-icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.result-stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--neon-blue);
}

.result-stat-label {
    font-size: 0.875rem;
    color: var(--text-dark-secondary);
}

body.light-mode .result-stat-label {
    color: var(--text-light-secondary);
}

.results-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* ================== XP & LEVEL ================== */
.xp-bar {
    background: var(--bg-dark-tertiary);
    border-radius: var(--radius-full);
    height: 8px;
    overflow: hidden;
    margin-top: 0.5rem;
}

body.light-mode .xp-bar {
    background: var(--bg-light-secondary);
}

.xp-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--neon-green), var(--neon-blue));
    border-radius: var(--radius-full);
    transition: width var(--transition-normal);
}

.level-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: var(--radius-full);
    font-weight: 700;
    font-size: 0.875rem;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    margin-bottom: 2rem;
}

body.light-mode .user-info {
    background: var(--bg-card-light);
}

.user-avatar {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
}

.user-details {
    flex: 1;
}

.user-name {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.user-level {
    font-size: 0.875rem;
    color: var(--text-dark-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

body.light-mode .user-level {
    color: var(--text-light-secondary);
}

.user-xp {
    font-size: 0.75rem;
    color: var(--neon-green);
}

/* ================== DASHBOARD ================== */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 1.5rem;
}

.dashboard-card {
    grid-column: span 4;
    padding: 1.5rem;
}

body.light-mode .dashboard-card {
    background: var(--bg-card-light);
}

@media (max-width: 1200px) {
    .dashboard-card {
        grid-column: span 6;
    }
}

@media (max-width: 768px) {
    .dashboard-card {
        grid-column: span 12;
    }
}

.dashboard-card-title {
    font-size: 0.875rem;
    color: var(--text-dark-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 1rem;
}

body.light-mode .dashboard-card-title {
    color: var(--text-light-secondary);
}

.dashboard-card-value {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.dashboard-card-change {
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.dashboard-card-change.positive {
    color: var(--neon-green);
}

.dashboard-card-change.negative {
    color: var(--neon-pink);
}

/* ================== CHARTS ================== */
.chart-container {
    position: relative;
    height: 250px;
    margin-top: 1rem;
}

/* ================== LEADERBOARD ================== */
.leaderboard-table {
    width: 100%;
    border-collapse: collapse;
}

.leaderboard-table th,
.leaderboard-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--glass-border);
}

body.light-mode .leaderboard-table th,
body.light-mode .leaderboard-table td {
    border-color: rgba(0, 0, 0, 0.1);
}

.leaderboard-table th {
    font-size: 0.875rem;
    color: var(--text-dark-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

body.light-mode .leaderboard-table th {
    color: var(--text-light-secondary);
}

.leaderboard-rank {
    width: 50px;
    text-align: center;
}

.rank-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    font-weight: 700;
    font-size: 0.875rem;
}

.rank-badge.gold {
    background: linear-gradient(135deg, #ffd700, #ffb700);
    color: var(--bg-dark);
}

.rank-badge.silver {
    background: linear-gradient(135deg, #c0c0c0, #a0a0a0);
    color: var(--bg-dark);
}

.rank-badge.bronze {
    background: linear-gradient(135deg, #cd7f32, #b87333);
    color: white;
}

.leaderboard-user {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.leaderboard-avatar {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
}

/* ================== ADMIN PANEL ================== */
.admin-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.admin-filters {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.question-list {
    display: grid;
    gap: 1rem;
}

.question-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.5rem;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--glass-border);
}

body.light-mode .question-item {
    background: var(--bg-card-light);
}

.question-item-content {
    flex: 1;
}

.question-item-actions {
    display: flex;
    gap: 0.5rem;
}

/* ================== SETTINGS ================== */
.settings-section {
    margin-bottom: 2rem;
}

.settings-title {
    font-size: 1.125rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--glass-border);
}

body.light-mode .settings-title {
    border-color: rgba(0, 0, 0, 0.1);
}

.setting-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
    border-bottom: 1px solid var(--glass-border);
}

body.light-mode .setting-item {
    border-color: rgba(0, 0, 0, 0.05);
}

.setting-info h4 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.setting-info p {
    font-size: 0.875rem;
    color: var(--text-dark-secondary);
    margin: 0;
}

body.light-mode .setting-info p {
    color: var(--text-light-secondary);
}

/* Toggle Switch */
.toggle {
    position: relative;
    width: 52px;
    height: 28px;
    background: var(--bg-dark-tertiary);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: background var(--transition-fast);
}

body.light-mode .toggle {
    background: var(--bg-light-secondary);
}

.toggle.active {
    background: var(--primary);
}

.toggle::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 24px;
    height: 24px;
    background: white;
    border-radius: var(--radius-full);
    transition: transform var(--transition-fast);
}

.toggle.active::after {
    transform: translateX(24px);
}

/* ================== NOTIFICATIONS ================== */
.notification-container {
    position: fixed;
    top: 2rem;
    right: 2rem;
    z-index: var(--z-tooltip);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.notification {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.5rem;
    background: var(--bg-dark-secondary);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    animation: slideIn 0.3s ease;
    min-width: 300px;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.notification.success {
    border-left-color: var(--neon-green);
}

.notification.error {
    border-left-color: var(--neon-pink);
}

.notification.warning {
    border-left-color: var(--neon-orange);
}

.notification-icon {
    font-size: 1.25rem;
}

.notification-content {
    flex: 1;
}

.notification-title {
    font-weight: 600;
    margin-bottom: 0.125rem;
}

.notification-message {
    font-size: 0.875rem;
    color: var(--text-dark-secondary);
}

body.light-mode .notification-message {
    color: var(--text-light-secondary);
}

/* ================== CONFETTI ================== */
.confetti-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: var(--z-tooltip);
    overflow: hidden;
}

.confetti {
    position: absolute;
    width: 10px;
    height: 10px;
    opacity: 0;
}

/* ================== LOADING ================== */
.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--bg-dark-tertiary);
    border-top-color: var(--primary);
    border-radius: var(--radius-full);
    animation: spin 1s linear infinite;
}

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

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 10, 15, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
}

/* ================== BADGES ================== */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    background: var(--bg-card);
    color: var(--text-dark-secondary);
}

body.light-mode .badge {
    background: var(--bg-light-secondary);
    color: var(--text-light-secondary);
}

.badge.xp {
    background: rgba(0, 255, 136, 0.2);
    color: var(--neon-green);
}

.badge.streak {
    background: rgba(255, 149, 0, 0.2);
    color: var(--neon-orange);
}

.badge.achievement {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
}

/* ================== THEME TOGGLE ================== */
.theme-toggle {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.theme-toggle:hover {
    background: var(--bg-card-hover);
    transform: rotate(15deg);
}

.theme-icon {
    font-size: 1.25rem;
}

/* ================== RESPONSIVE ================== */
@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
}

@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
    h3 { font-size: 1.5rem; }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .navbar {
        padding: 1rem;
    }
    
    .main-content {
        padding: 1rem;
    }
    
    .quiz-container {
        padding: 1rem;
    }
    
    .question-card {
        padding: 1.5rem;
    }
    
    .results-score {
        margin-bottom: 1.5rem;
    }
    
    .score-circle {
        width: 150px;
        height: 150px;
    }
    
    .score-value {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .btn {
        padding: 0.75rem 1.25rem;
        font-size: 0.875rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .mode-grid {
        grid-template-columns: 1fr;
    }
    
    .quiz-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .quiz-stats {
        justify-content: space-around;
    }
    
    .results-stats {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ================== UTILITY CLASSES ================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.gap-3 { gap: 1.5rem; }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.p-1 { padding: 0.5rem; }
.p-2 { padding: 1rem; }
.p-3 { padding: 1.5rem; }
.p-4 { padding: 2rem; }

.w-full { width: 100%; }
.h-full { height: 100%; }

.hidden { display: none !important; }
.visible { display: block !important; }

.opacity-50 { opacity: 0.5; }
.opacity-75 { opacity: 0.75; }

.cursor-pointer { cursor: pointer; }
.cursor-not-allowed { cursor: not-allowed; }

.overflow-hidden { overflow: hidden; }
.overflow-auto { overflow: auto; }

/* ================== ANIMATIONS ================== */
.animate-float {
    animation: float 3s ease-in-out infinite;
}

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

.animate-pulse {
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.animate-bounce {
    animation: bounce 1s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-5px); }
}

.animate-shake {
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

.animate-glow {
    animation: glow 2s ease-in-out infinite;
}

@keyframes glow {
    0%, 100% { box-shadow: 0 0 20px rgba(99, 102, 241, 0.3); }
    50% { box-shadow: 0 0 40px rgba(99, 102, 241, 0.6); }
}

/* ================== 3D HOVER EFFECTS ================== */
.hover-3d {
    perspective: 1000px;
}

.hover-3d-inner {
    transition: transform 0.3s ease;
}

.hover-3d:hover .hover-3d-inner {
    transform: rotateY(10deg) rotateX(10deg);
}

/* ================== SCROLLBAR ================== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-dark-secondary);
}

body.light-mode ::-webkit-scrollbar-track {
    background: var(--bg-light-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-card-hover);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-dark-secondary);
}

body.light-mode ::-webkit-scrollbar-thumb:hover {
    background: var(--text-light-secondary);
}

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