/* ==================== VARIABLES & RESET ==================== */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #ec4899;
    --accent: #14b8a6;
    --warning: #f59e0b;
    --danger: #ef4444;
    --success: #22c55e;
    --dark: #0f172a;
    --dark-2: #1e293b;
    --dark-3: #334155;
    --light: #f8fafc;
    --gray: #64748b;
    --gray-light: #e2e8f0;
    --gradient-1: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);
    --gradient-2: linear-gradient(135deg, #14b8a6 0%, #6366f1 100%);
    --gradient-3: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);
    --gradient-bg: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #312e81 100%);
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.15);
    --shadow-lg: 0 10px 40px rgba(0,0,0,0.2);
    --shadow-glow: 0 0 30px rgba(99,102,241,0.3);
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Plus Jakarta Sans', sans-serif;
    background: var(--dark);
    color: var(--light);
    overflow-x: hidden;
    min-height: 100vh;
}

body::before {
    content: '';
    position: fixed;
    top: 0; left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-bg);
    z-index: -2;
}

body::after {
    content: '';
    position: fixed;
    top: 0; left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(circle at 20% 30%, rgba(99,102,241,0.15) 0%, transparent 40%),
        radial-gradient(circle at 80% 70%, rgba(236,72,153,0.12) 0%, transparent 40%),
        radial-gradient(circle at 50% 50%, rgba(20,184,166,0.08) 0%, transparent 50%);
    z-index: -1;
    pointer-events: none;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { cursor: pointer; font-family: inherit; border: none; outline: none; }
textarea { font-family: inherit; }

/* ==================== SCROLLBAR ==================== */
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--dark-2); }
::-webkit-scrollbar-thumb { background: var(--dark-3); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: var(--primary); }

/* ==================== UTILITIES ==================== */
.gradient-text {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ==================== BUTTONS ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 15px;
    transition: var(--transition);
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

.btn-sm { padding: 8px 16px; font-size: 13px; }
.btn-lg { padding: 16px 32px; font-size: 16px; }

.btn-primary {
    background: var(--gradient-1);
    color: #fff;
    box-shadow: 0 4px 15px rgba(99,102,241,0.4);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(99,102,241,0.5);
}
.btn-primary:active { transform: translateY(0); }

.btn-outline {
    background: rgba(255,255,255,0.08);
    color: var(--light);
    border: 1.5px solid rgba(255,255,255,0.15);
    backdrop-filter: blur(10px);
}
.btn-outline:hover {
    background: rgba(255,255,255,0.15);
    border-color: var(--primary-light);
    transform: translateY(-2px);
}

.btn-ghost {
    background: transparent;
    color: var(--gray-light);
    padding: 8px 16px;
}
.btn-ghost:hover { color: var(--light); background: rgba(255,255,255,0.08); }

.btn-light {
    background: #fff;
    color: var(--dark);
    box-shadow: var(--shadow-md);
}
.btn-light:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }

.btn-danger {
    background: var(--danger);
    color: #fff;
}
.btn-danger:hover { background: #dc2626; transform: translateY(-2px); }

/* ==================== NAVBAR ==================== */
.navbar {
    position: fixed;
    top: 0; left: 0;
    width: 100%;
    z-index: 1000;
    padding: 16px 0;
    transition: var(--transition);
}
.navbar.scrolled {
    background: rgba(15,23,42,0.85);
    backdrop-filter: blur(20px);
    box-shadow: 0 2px 20px rgba(0,0,0,0.3);
    padding: 10px 0;
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: 'Poppins', sans-serif;
    font-weight: 700;
    font-size: 22px;
}

.logo-icon {
    width: 42px;
    height: 42px;
    background: var(--gradient-1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: #fff;
    box-shadow: var(--shadow-glow);
}

.logo-text .accent { color: var(--primary-light); }

.nav-menu {
    display: flex;
    gap: 8px;
}
.nav-menu a {
    padding: 8px 18px;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 15px;
    color: var(--gray-light);
    transition: var(--transition);
}
.nav-menu a:hover {
    color: var(--light);
    background: rgba(255,255,255,0.08);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: transparent;
    padding: 8px;
}
.nav-toggle span {
    width: 24px;
    height: 2.5px;
    background: var(--light);
    border-radius: 2px;
    transition: var(--transition);
}
.nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }

/* ==================== VIEWS ==================== */
.view {
    display: none;
    padding-top: 80px;
    min-height: 100vh;
    animation: fadeIn 0.5s ease;
}
.view.active { display: block; }

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

/* ==================== HERO ==================== */
.hero {
    min-height: calc(100vh - 80px);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding: 40px 24px;
}

.hero-bg-shapes .shape {
    position: absolute;
    border-radius: 50%;
    filter: blur(60px);
    opacity: 0.5;
}
.shape-1 { width: 400px; height: 400px; background: var(--primary); top: -100px; left: -50px; animation: float 8s ease-in-out infinite; }
.shape-2 { width: 350px; height: 350px; background: var(--secondary); top: 50%; right: -80px; animation: float 10s ease-in-out infinite reverse; }
.shape-3 { width: 250px; height: 250px; background: var(--accent); bottom: -50px; left: 30%; animation: float 12s ease-in-out infinite; }
.shape-4 { width: 200px; height: 200px; background: #a855f7; top: 20%; right: 25%; animation: float 9s ease-in-out infinite reverse; }

@keyframes float {
    0%, 100% { transform: translate(0,0) scale(1); }
    33% { transform: translate(30px,-30px) scale(1.1); }
    66% { transform: translate(-20px,20px) scale(0.95); }
}

.hero-content {
    text-align: center;
    max-width: 800px;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: rgba(99,102,241,0.15);
    border: 1px solid rgba(99,102,241,0.3);
    border-radius: 50px;
    font-size: 14px;
    font-weight: 500;
    color: var(--primary-light);
    margin-bottom: 24px;
    animation: badgePulse 3s ease infinite;
}

@keyframes badgePulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(99,102,241,0.3); }
    50% { box-shadow: 0 0 0 10px rgba(99,102,241,0); }
}

.hero-title {
    font-family: 'Poppins', sans-serif;
    font-size: clamp(2rem, 6vw, 4rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
}

.hero-subtitle {
    font-size: 18px;
    line-height: 1.7;
    color: var(--gray-light);
    max-width: 600px;
    margin: 0 auto 36px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 50px;
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
}
.stat { text-align: center; }
.stat-number {
    font-family: 'Poppins', sans-serif;
    font-size: 32px;
    font-weight: 700;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.stat-label { font-size: 14px; color: var(--gray); margin-top: 4px; }
.stat-divider { width: 1px; height: 40px; background: rgba(255,255,255,0.1); }

/* ==================== SECTIONS ==================== */
.section {
    max-width: 1280px;
    margin: 0 auto;
    padding: 80px 24px;
}

.section-alt {
    max-width: 100%;
    background: rgba(255,255,255,0.02);
    border-top: 1px solid rgba(255,255,255,0.05);
    border-bottom: 1px solid rgba(255,255,255,0.05);
    border-radius: 0;
}

.section-header {
    text-align: center;
    margin-bottom: 50px;
}
.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(99,102,241,0.15);
    border-radius: 50px;
    font-size: 13px;
    font-weight: 600;
    color: var(--primary-light);
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 1px;
}
.section-title {
    font-family: 'Poppins', sans-serif;
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 12px;
}
.section-desc {
    font-size: 16px;
    color: var(--gray);
    max-width: 600px;
    margin: 0 auto;
}

/* ==================== FEATURES ==================== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

.feature-card {
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: var(--transition);
    opacity: 0;
    animation: slideUp 0.6s ease forwards;
    animation-delay: var(--delay);
}
@keyframes slideUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}
.feature-card:hover {
    background: rgba(255,255,255,0.07);
    border-color: rgba(99,102,241,0.3);
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}
.feature-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: #fff;
    margin-bottom: 20px;
    background: var(--color);
    box-shadow: 0 4px 15px var(--color);
}
.feature-card h3 {
    font-size: 19px;
    font-weight: 700;
    margin-bottom: 10px;
}
.feature-card p {
    font-size: 15px;
    line-height: 1.6;
    color: var(--gray);
}

/* ==================== STEPS ==================== */
.steps-grid {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}
.step-card {
    flex: 1;
    min-width: 280px;
    max-width: 340px;
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    text-align: center;
    position: relative;
    transition: var(--transition);
}
.step-card:hover { transform: translateY(-6px); border-color: rgba(99,102,241,0.3); }
.step-number {
    position: absolute;
    top: -18px; left: 50%;
    transform: translateX(-50%);
    width: 40px; height: 40px;
    background: var(--gradient-1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 18px;
    box-shadow: var(--shadow-glow);
}
.step-icon {
    width: 64px; height: 64px;
    margin: 16px auto 20px;
    background: rgba(99,102,241,0.15);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    color: var(--primary-light);
}
.step-card h3 { font-size: 18px; margin-bottom: 10px; }
.step-card p { font-size: 14px; color: var(--gray); line-height: 1.6; }
.step-connector {
    color: var(--gray);
    font-size: 24px;
}

/* ==================== CTA ==================== */
.cta-section {
    padding: 60px 24px 80px;
    max-width: 1280px;
    margin: 0 auto;
}
.cta-card {
    background: var(--gradient-1);
    border-radius: var(--radius-xl);
    padding: 60px 40px;
    text-align: center;
    position: relative;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(99,102,241,0.3);
}
.cta-bg-shape {
    position: absolute;
    top: -50%; right: -10%;
    width: 400px; height: 400px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
}
.cta-card h2 {
    font-family: 'Poppins', sans-serif;
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    margin-bottom: 12px;
    position: relative;
}
.cta-card p { font-size: 18px; opacity: 0.9; margin-bottom: 32px; position: relative; }
.cta-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    position: relative;
}
.btn-ghost { color: #fff; border: 1.5px solid rgba(255,255,255,0.3); background: transparent; }
.btn-ghost:hover { background: rgba(255,255,255,0.15); }

/* ==================== QUIZ: SELECTION ==================== */
.quiz-select-screen { padding: 40px 24px 80px; max-width: 1280px; margin: 0 auto; }

.quiz-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 24px;
}

.quiz-card {
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-lg);
    padding: 28px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}
.quiz-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 4px;
    background: var(--card-color, var(--gradient-1));
}
.quiz-card:hover {
    transform: translateY(-6px);
    border-color: rgba(99,102,241,0.3);
    box-shadow: var(--shadow-lg);
}
.quiz-card-icon {
    width: 52px; height: 52px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    color: #fff;
    margin-bottom: 16px;
}
.quiz-card h3 { font-size: 18px; margin-bottom: 8px; }
.quiz-card .quiz-desc {
    font-size: 14px;
    color: var(--gray);
    line-height: 1.6;
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.quiz-card-meta {
    display: flex;
    gap: 16px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}
.quiz-meta-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--gray);
}
.quiz-meta-item i { color: var(--primary-light); }

/* ==================== QUIZ: ACTIVE (SPLIT LAYOUT) ==================== */
.quiz-active-screen {
    max-width: 1280px;
    margin: 0 auto;
    padding: 20px 24px 60px;
}

/* Top Bar */
.quiz-topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 12px;
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-lg);
    padding: 14px 20px;
    backdrop-filter: blur(10px);
}
.quiz-topbar-left {
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 0;
    flex: 1;
}
.quiz-title-display {
    font-size: 19px;
    font-weight: 700;
    font-family: 'Poppins', sans-serif;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.quiz-topbar-right { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }

.quiz-timer {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    background: rgba(99,102,241,0.15);
    border: 1px solid rgba(99,102,241,0.3);
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 16px;
    color: var(--primary-light);
    transition: var(--transition);
}
.quiz-timer.warning {
    background: rgba(239,68,68,0.15);
    border-color: rgba(239,68,68,0.4);
    color: var(--danger);
    animation: timerPulse 1s ease infinite;
}
@keyframes timerPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

/* Split Layout */
.quiz-split {
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 24px;
    align-items: start;
}

/* LEFT: Question Area */
.quiz-left {
    display: flex;
    flex-direction: column;
    min-width: 0;
}
.quiz-progress-wrap { margin-bottom: 20px; }
.quiz-progress-bar {
    width: 100%;
    height: 8px;
    background: rgba(255,255,255,0.08);
    border-radius: 50px;
    overflow: hidden;
    margin-bottom: 8px;
}
.progress-fill {
    height: 100%;
    background: var(--gradient-1);
    border-radius: 50px;
    width: 0%;
    transition: width 0.4s ease;
}
.quiz-progress-text {
    font-size: 14px;
    color: var(--gray);
    text-align: right;
}

.question-container {
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-lg);
    padding: 32px;
    margin-bottom: 20px;
    min-height: 300px;
    flex: 1;
}

.question-number {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary-light);
    margin-bottom: 12px;
}
.question-text {
    font-size: 20px;
    font-weight: 600;
    line-height: 1.5;
    margin-bottom: 28px;
    font-family: 'Poppins', sans-serif;
}

.options-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
}
.option-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 18px 20px;
    background: rgba(255,255,255,0.04);
    border: 2px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
}
.option-item:hover {
    background: rgba(99,102,241,0.1);
    border-color: var(--primary-light);
    transform: translateX(4px);
}
.option-item.selected {
    background: rgba(99,102,241,0.15);
    border-color: var(--primary);
}
.option-item.correct {
    background: rgba(34,197,94,0.12);
    border-color: var(--success);
}
.option-item.wrong {
    background: rgba(239,68,68,0.12);
    border-color: var(--danger);
}
.option-letter {
    width: 36px; height: 36px;
    min-width: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    background: rgba(255,255,255,0.1);
    border: 1.5px solid rgba(255,255,255,0.1);
    transition: var(--transition);
}
.option-item.selected .option-letter {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}
.option-item.correct .option-letter {
    background: var(--success);
    border-color: var(--success);
    color: #fff;
}
.option-item.wrong .option-letter {
    background: var(--danger);
    border-color: var(--danger);
    color: #fff;
}
.option-text { font-size: 16px; line-height: 1.5; }

.option-icon {
    margin-left: auto;
    font-size: 18px;
    opacity: 0;
    transition: var(--transition);
}
.option-item.correct .option-icon,
.option-item.wrong .option-icon { opacity: 1; }
.option-item.correct .option-icon { color: var(--success); }
.option-item.wrong .option-icon { color: var(--danger); }

.explanation-box {
    margin-top: 20px;
    padding: 18px 20px;
    background: rgba(20,184,166,0.08);
    border-left: 4px solid var(--accent);
    border-radius: var(--radius-sm);
    font-size: 15px;
    line-height: 1.6;
    display: none;
}
.explanation-box.show { display: block; animation: fadeIn 0.4s ease; }
.explanation-box strong { color: var(--accent); }

/* Quiz Controls (prev/next only) */
.quiz-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none !important;
}

/* RIGHT: Navigator Sidebar */
.quiz-right {
    position: sticky;
    top: 90px;
}
.navigator-card {
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-lg);
    padding: 24px;
    backdrop-filter: blur(10px);
}
.navigator-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}
.navigator-header i {
    font-size: 20px;
    color: var(--primary-light);
}
.navigator-header h3 {
    font-size: 17px;
    font-weight: 700;
    font-family: 'Poppins', sans-serif;
}

.navigator-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 20px;
}
.nav-stat {
    text-align: center;
    padding: 12px 8px;
    border-radius: var(--radius-md);
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.06);
}
.nav-stat.answered { border-color: rgba(99,102,241,0.2); }
.nav-stat.unanswered { border-color: rgba(239,68,68,0.15); }
.nav-stat-num {
    display: block;
    font-size: 24px;
    font-weight: 800;
    font-family: 'Poppins', sans-serif;
    line-height: 1.2;
}
.nav-stat.answered .nav-stat-num { color: var(--primary-light); }
.nav-stat.unanswered .nav-stat-num { color: var(--danger); }
.nav-stat-lbl {
    display: block;
    font-size: 12px;
    color: var(--gray);
    margin-top: 4px;
}

.navigator-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
    margin-bottom: 20px;
}
.nav-btn {
    aspect-ratio: 1;
    border-radius: var(--radius-sm);
    background: rgba(255,255,255,0.06);
    border: 1.5px solid rgba(255,255,255,0.1);
    color: var(--gray-light);
    font-weight: 600;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    cursor: pointer;
}
.nav-btn:hover {
    background: rgba(99,102,241,0.15);
    border-color: var(--primary-light);
    transform: translateY(-2px);
    color: var(--light);
}
.nav-btn.answered {
    background: rgba(99,102,241,0.2);
    border-color: var(--primary);
    color: var(--primary-light);
}
.nav-btn.current {
    background: var(--gradient-1);
    border-color: transparent;
    color: #fff;
    box-shadow: var(--shadow-glow);
    transform: scale(1.08);
}
.nav-btn.current:hover { transform: scale(1.12); }

.navigator-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}
.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: var(--gray);
}
.legend-dot {
    width: 14px; height: 14px;
    border-radius: var(--radius-sm);
    border: 1.5px solid rgba(255,255,255,0.1);
    background: rgba(255,255,255,0.06);
}
.legend-dot.answered { background: rgba(99,102,241,0.2); border-color: var(--primary); }
.legend-dot.current { background: var(--gradient-1); border-color: transparent; }

.navigator-submit {
    width: 100%;
    font-size: 15px;
}

/* ==================== RESULT OVERLAY ==================== */
.result-overlay {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(15,23,42,0.9);
    backdrop-filter: blur(10px);
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 24px;
}
.result-overlay.show { display: flex; animation: fadeIn 0.4s ease; }

.result-modal {
    background: rgba(30,41,59,0.95);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-xl);
    padding: 48px 40px;
    max-width: 480px;
    width: 100%;
    text-align: center;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    animation: modalPop 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}
@keyframes modalPop {
    from { opacity: 0; transform: scale(0.8); }
    to { opacity: 1; transform: scale(1); }
}

.result-confetti {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    pointer-events: none;
    overflow: hidden;
}
.confetti-piece {
    position: absolute;
    width: 10px; height: 10px;
    top: -20px;
    animation: confettiFall 3s linear infinite;
}
@keyframes confettiFall {
    0% { transform: translateY(0) rotate(0deg); opacity: 1; }
    100% { transform: translateY(600px) rotate(720deg); opacity: 0; }
}

.result-icon {
    width: 80px; height: 80px;
    margin: 0 auto 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 36px;
    color: #fff;
    background: var(--gradient-1);
    box-shadow: var(--shadow-glow);
    animation: iconBounce 0.6s ease;
}
@keyframes iconBounce {
    0% { transform: scale(0); }
    60% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

.result-title { font-family: 'Poppins', sans-serif; font-size: 26px; margin-bottom: 8px; }
.result-subtitle { font-size: 16px; color: var(--gray); margin-bottom: 28px; }

.result-score { margin-bottom: 28px; }
.score-circle {
    width: 160px; height: 160px;
    margin: 0 auto;
    border-radius: 50%;
    background: conic-gradient(var(--primary) 0deg, var(--primary) 0deg, rgba(255,255,255,0.08) 0deg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    transition: background 1s ease;
}
.score-circle::before {
    content: '';
    position: absolute;
    top: 10px; left: 10px;
    width: calc(100% - 20px); height: calc(100% - 20px);
    background: var(--dark-2);
    border-radius: 50%;
}
.score-value {
    font-family: 'Poppins', sans-serif;
    font-size: 48px;
    font-weight: 800;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    z-index: 1;
    line-height: 1;
}
.score-total {
    font-size: 16px;
    color: var(--gray);
    z-index: 1;
}

.result-stats {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-bottom: 28px;
    flex-wrap: wrap;
}
.result-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}
.result-stat i { font-size: 22px; color: var(--primary-light); }
.result-stat span { font-size: 22px; font-weight: 700; }
.result-stat small { font-size: 12px; color: var(--gray); text-transform: uppercase; letter-spacing: 0.5px; }

.result-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ==================== REVIEW ==================== */
#view-review { padding-top: 80px; }
.review-header {
    max-width: 800px;
    margin: 20px auto 0;
    padding: 0 24px;
    display: flex;
    align-items: center;
    gap: 16px;
}
.review-header h2 { font-family: 'Poppins', sans-serif; font-size: 24px; }
.review-summary {
    max-width: 800px;
    margin: 20px auto;
    padding: 0 24px;
}
.review-summary-card {
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-lg);
    padding: 24px;
    display: flex;
    align-items: center;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 16px;
}
.review-summary-item { text-align: center; }
.review-summary-item .num { font-size: 28px; font-weight: 700; }
.review-summary-item .lbl { font-size: 13px; color: var(--gray); }
.review-summary-item.correct .num { color: var(--success); }
.review-summary-item.wrong .num { color: var(--danger); }

.review-list {
    max-width: 800px;
    margin: 0 auto 60px;
    padding: 0 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}
.review-item {
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-lg);
    padding: 24px;
    border-left: 4px solid var(--gray);
}
.review-item.correct { border-left-color: var(--success); }
.review-item.wrong { border-left-color: var(--danger); }
.review-item-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}
.review-badge {
    padding: 4px 12px;
    border-radius: 50px;
    font-size: 12px;
    font-weight: 600;
}
.review-badge.correct { background: rgba(34,197,94,0.15); color: var(--success); }
.review-badge.wrong { background: rgba(239,68,68,0.15); color: var(--danger); }
.review-q-num { font-size: 13px; color: var(--gray); font-weight: 600; }
.review-question { font-size: 17px; font-weight: 600; margin-bottom: 14px; line-height: 1.5; }
.review-answer {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 15px;
}
.review-answer.your-correct { background: rgba(34,197,94,0.1); }
.review-answer.your-wrong { background: rgba(239,68,68,0.1); }
.review-answer.correct { background: rgba(34,197,94,0.1); }
.review-answer i { font-size: 16px; }
.review-answer-label { font-weight: 600; font-size: 13px; color: var(--gray); margin-bottom: 6px; margin-top: 8px; }
.review-explanation {
    margin-top: 12px;
    padding: 14px 16px;
    background: rgba(20,184,166,0.06);
    border-left: 3px solid var(--accent);
    border-radius: var(--radius-sm);
    font-size: 14px;
    line-height: 1.6;
}

/* ==================== TEACHER PANEL ==================== */
.teacher-panel {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px 60px;
    display: grid;
    grid-template-columns: 1fr 420px;
    gap: 24px;
    align-items: start;
}

.teacher-editor-side {
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.editor-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    flex-wrap: wrap;
    gap: 8px;
}
.editor-tabs { display: flex; gap: 4px; }
.editor-tab {
    padding: 8px 16px;
    background: transparent;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    color: var(--gray);
    transition: var(--transition);
}
.editor-tab.active { background: rgba(99,102,241,0.15); color: var(--primary-light); }
.editor-actions { display: flex; gap: 8px; flex-wrap: wrap; }

.json-editor-wrap { position: relative; }
.json-editor {
    width: 100%;
    min-height: 400px;
    max-height: 500px;
    padding: 20px;
    background: var(--dark);
    color: #e2e8f0;
    border: none;
    outline: none;
    resize: vertical;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 14px;
    line-height: 1.6;
}

.editor-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    border-top: 1px solid rgba(255,255,255,0.08);
    flex-wrap: wrap;
    gap: 12px;
}
.validation-status {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--gray);
}
.validation-status.valid { color: var(--success); }
.validation-status.invalid { color: var(--danger); }

.teacher-saved-side {
    display: flex;
    flex-direction: column;
    gap: 20px;
}
.saved-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 4px;
}
.saved-header h3 { font-size: 18px; display: flex; align-items: center; gap: 8px; }
.saved-header h3 i { color: var(--primary-light); }
.saved-count {
    font-size: 13px;
    color: var(--gray);
    background: rgba(255,255,255,0.08);
    padding: 4px 12px;
    border-radius: 50px;
}

.saved-quiz-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    max-height: 400px;
    overflow-y: auto;
    padding-right: 4px;
}
.saved-quiz-item {
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-md);
    padding: 16px;
    transition: var(--transition);
}
.saved-quiz-item:hover { border-color: rgba(99,102,241,0.3); background: rgba(255,255,255,0.07); }
.saved-quiz-item-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    margin-bottom: 8px;
}
.saved-quiz-item-title { font-size: 15px; font-weight: 600; flex: 1; }
.saved-quiz-item-actions { display: flex; gap: 4px; }
.icon-btn {
    width: 32px; height: 32px;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--gray);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    font-size: 14px;
}
.icon-btn:hover { background: rgba(255,255,255,0.1); color: var(--light); }
.icon-btn.danger:hover { background: rgba(239,68,68,0.15); color: var(--danger); }
.saved-quiz-item-meta {
    display: flex;
    gap: 12px;
    font-size: 12px;
    color: var(--gray);
}
.saved-empty {
    text-align: center;
    padding: 40px 20px;
    color: var(--gray);
}
.saved-empty i { font-size: 40px; margin-bottom: 12px; opacity: 0.3; }

.json-format-guide {
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-lg);
    padding: 20px;
}
.json-format-guide h4 {
    font-size: 15px;
    margin-bottom: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.format-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}
.format-table th, .format-table td {
    padding: 8px 10px;
    text-align: left;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}
.format-table th { color: var(--gray); font-weight: 600; font-size: 12px; text-transform: uppercase; }
.format-table code { background: rgba(99,102,241,0.15); padding: 2px 6px; border-radius: 4px; font-size: 12px; color: var(--primary-light); }

/* ==================== ABOUT ==================== */
.about-hero {
    padding: 40px 24px;
    display: flex;
    justify-content: center;
}
.about-card {
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-xl);
    padding: 48px 40px;
    text-align: center;
    max-width: 560px;
    width: 100%;
    position: relative;
    overflow: hidden;
}
.about-avatar {
    width: 120px; height: 120px;
    margin: 0 auto 24px;
    position: relative;
}
.avatar-ring {
    position: absolute;
    top: -8px; left: -8px;
    width: calc(100% + 16px); height: calc(100% + 16px);
    border: 3px solid transparent;
    border-top-color: var(--primary);
    border-right-color: var(--secondary);
    border-radius: 50%;
    animation: spin 4s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.avatar-inner {
    width: 100%; height: 100%;
    background: var(--gradient-1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 50px;
    color: #fff;
}
.about-name {
    font-family: 'Poppins', sans-serif;
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 8px;
}
.about-role { font-size: 16px; color: var(--primary-light); margin-bottom: 16px; }
.about-tagline {
    font-size: 15px;
    color: var(--gray);
    font-style: italic;
    line-height: 1.6;
    margin-bottom: 24px;
}
.about-socials { display: flex; gap: 12px; justify-content: center; }
.social-link {
    width: 44px; height: 44px;
    border-radius: 50%;
    background: rgba(255,255,255,0.08);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: var(--gray-light);
    transition: var(--transition);
}
.social-link:hover { background: var(--gradient-1); color: #fff; transform: translateY(-4px); }

.about-info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}
.about-info-card {
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: var(--transition);
}
.about-info-card:hover { transform: translateY(-4px); border-color: rgba(99,102,241,0.3); }
.info-icon {
    width: 52px; height: 52px;
    background: rgba(99,102,241,0.15);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    color: var(--primary-light);
    margin-bottom: 16px;
}
.about-info-card h3 { font-size: 18px; margin-bottom: 10px; }
.about-info-card p { font-size: 15px; line-height: 1.7; color: var(--gray); }

.tech-section { padding: 40px 24px 80px; max-width: 1280px; margin: 0 auto; }
.tech-badges { display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; }
.tech-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 50px;
    font-size: 15px;
    font-weight: 500;
    transition: var(--transition);
}
.tech-badge:hover { background: rgba(99,102,241,0.1); border-color: var(--primary-light); transform: translateY(-3px); }
.tech-badge i { font-size: 18px; color: var(--primary-light); }

/* ==================== FOOTER ==================== */
.footer {
    background: rgba(15,23,42,0.6);
    backdrop-filter: blur(10px);
    border-top: 1px solid rgba(255,255,255,0.06);
    padding: 60px 24px 0;
}
.footer-content {
    max-width: 1280px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1.5fr;
    gap: 40px;
    padding-bottom: 40px;
}
.footer-brand p { font-size: 14px; color: var(--gray); line-height: 1.6; margin-top: 12px; max-width: 300px; }
.footer-links h4, .footer-developer h4 {
    font-size: 16px;
    margin-bottom: 16px;
    font-weight: 600;
}
.footer-links a {
    display: block;
    font-size: 14px;
    color: var(--gray);
    padding: 6px 0;
    transition: var(--transition);
}
.footer-links a:hover { color: var(--primary-light); padding-left: 6px; }

.dev-info { display: flex; align-items: center; gap: 14px; }
.dev-avatar {
    width: 48px; height: 48px;
    background: var(--gradient-1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: #fff;
}
.dev-info strong { display: block; font-size: 15px; }
.dev-info span { font-size: 13px; color: var(--gray); }

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.06);
    padding: 20px 24px;
    text-align: center;
}
.footer-bottom p { font-size: 13px; color: var(--gray); }
.footer-bottom i { color: var(--danger); }

/* ==================== RESULT STUDENT NAME ==================== */
.result-student-name {
    font-size: 15px;
    font-weight: 600;
    color: var(--primary-light);
    margin-bottom: 6px;
    padding: 6px 16px;
    background: rgba(99,102,241,0.1);
    border-radius: 50px;
    display: inline-block;
}

/* ==================== NAME INPUT MODAL ==================== */
.name-modal-overlay {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(15,23,42,0.85);
    backdrop-filter: blur(10px);
    z-index: 2500;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 24px;
}
.name-modal-overlay.show { display: flex; animation: fadeIn 0.3s ease; }

.name-modal {
    background: rgba(30,41,59,0.95);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-xl);
    max-width: 440px;
    width: 100%;
    overflow: hidden;
    position: relative;
    box-shadow: var(--shadow-lg);
    animation: modalPop 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.name-modal-bg-shape {
    position: absolute;
    top: -60px; right: -30px;
    width: 200px; height: 200px;
    background: var(--gradient-1);
    border-radius: 50%;
    opacity: 0.1;
}
.name-modal-content {
    padding: 40px 36px;
    text-align: center;
    position: relative;
}
.name-modal-icon {
    width: 72px; height: 72px;
    margin: 0 auto 20px;
    background: var(--gradient-1);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 30px;
    color: #fff;
    box-shadow: var(--shadow-glow);
    animation: iconBounce 0.5s ease;
}
.name-modal h2 {
    font-family: 'Poppins', sans-serif;
    font-size: 24px;
    margin-bottom: 8px;
}
.name-modal p {
    font-size: 15px;
    color: var(--gray);
    margin-bottom: 24px;
    line-height: 1.5;
}
.name-input-wrap { margin-bottom: 28px; }
.name-input {
    width: 100%;
    padding: 16px 20px;
    background: var(--dark);
    border: 2px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-md);
    color: var(--light);
    font-size: 17px;
    font-family: inherit;
    outline: none;
    transition: var(--transition);
    text-align: center;
}
.name-input::placeholder { color: var(--gray); }
.name-input:focus {
    border-color: var(--primary);
    background: var(--dark-2);
    box-shadow: 0 0 0 4px rgba(99,102,241,0.1);
}
.name-modal-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
}
.name-modal-buttons .btn { flex: 1; }

/* ==================== LEADERBOARD ==================== */
#view-leaderboard { padding: 80px 0 0; }

.podium-section {
    max-width: 900px;
    margin: 0 auto 50px;
    padding: 0 24px;
}
.podium {
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: 20px;
}
.podium-col {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    flex: 1;
    max-width: 220px;
}
.podium-avatar {
    width: 64px; height: 64px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    color: #fff;
    margin-bottom: 10px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    animation: iconBounce 0.6s ease;
}
.podium-name {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 4px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 100%;
}
.podium-score {
    font-family: 'Poppins', sans-serif;
    font-size: 28px;
    font-weight: 800;
    line-height: 1;
    margin-bottom: 4px;
}
.podium-place {
    font-size: 12px;
    color: var(--gray);
    margin-bottom: 12px;
}
.podium-bar {
    width: 100%;
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    padding: 12px 0;
    text-align: center;
    font-weight: 700;
    font-size: 18px;
    color: #fff;
}
.podium-1 .podium-bar { height: 110px; }
.podium-2 .podium-bar { height: 80px; }
.podium-3 .podium-bar { height: 60px; }

.leaderboard-table-wrap {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 24px;
    overflow-x: auto;
}
.leaderboard-table {
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-lg);
    overflow: hidden;
}
.lb-row {
    display: grid;
    grid-template-columns: 70px 1.5fr 2fr 80px 80px 90px 80px;
    align-items: center;
    padding: 14px 20px;
    border-bottom: 1px solid rgba(255,255,255,0.04);
    transition: var(--transition);
}
.lb-row:last-child { border-bottom: none; }
.lb-row:not(.lb-header-row):hover { background: rgba(255,255,255,0.04); }
.lb-header-row {
    background: rgba(255,255,255,0.05);
    font-size: 12px;
    font-weight: 700;
    color: var(--gray);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.lb-cell {
    padding: 4px 8px;
    font-size: 14px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.lb-rank {
    font-weight: 700;
    font-size: 16px;
    text-align: center;
}
.lb-row.rank-1 .lb-rank { color: #f59e0b; }
.lb-row.rank-2 .lb-rank { color: #94a3b8; }
.lb-row.rank-3 .lb-rank { color: #cd7f32; }
.lb-name { font-weight: 600; }
.lb-score-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 42px;
    padding: 4px 10px;
    border-radius: 50px;
    font-weight: 700;
    font-size: 15px;
    background: var(--gradient-1);
    color: #fff;
}
.lb-row.rank-1 .lb-score-badge { background: linear-gradient(135deg, #f59e0b, #f97316); }
.lb-row.rank-2 .lb-score-badge { background: linear-gradient(135deg, #94a3b8, #64748b); }
.lb-row.rank-3 .lb-score-badge { background: linear-gradient(135deg, #cd7f32, #a16207); }

.leaderboard-empty {
    text-align: center;
    padding: 60px 24px;
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-lg);
}
.leaderboard-empty i { font-size: 56px; color: var(--gray); opacity: 0.3; margin-bottom: 16px; }
.leaderboard-empty h3 { font-size: 20px; margin-bottom: 8px; }
.leaderboard-empty p { font-size: 15px; color: var(--gray); }

.leaderboard-footer {
    max-width: 1000px;
    margin: 30px auto 60px;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}
.leaderboard-filter {
    display: flex;
    align-items: center;
    gap: 10px;
}
.leaderboard-filter label { font-size: 14px; color: var(--gray); white-space: nowrap; }
.leaderboard-filter select {
    padding: 8px 16px;
    background: var(--dark-2);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-sm);
    color: var(--light);
    font-family: inherit;
    font-size: 14px;
    cursor: pointer;
    outline: none;
}
.leaderboard-filter select:focus { border-color: var(--primary); }

/* ==================== TOAST ==================== */
.toast-container {
    position: fixed;
    top: 90px; right: 24px;
    z-index: 3000;
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.toast {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 20px;
    background: rgba(30,41,59,0.95);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    min-width: 280px;
    max-width: 400px;
    animation: toastIn 0.4s ease;
}
@keyframes toastIn {
    from { opacity: 0; transform: translateX(100px); }
    to { opacity: 1; transform: translateX(0); }
}
.toast.removing { animation: toastOut 0.3s ease forwards; }
@keyframes toastOut {
    to { opacity: 0; transform: translateX(100px); }
}
.toast-icon {
    width: 32px; height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    flex-shrink: 0;
}
.toast.success .toast-icon { background: rgba(34,197,94,0.2); color: var(--success); }
.toast.error .toast-icon { background: rgba(239,68,68,0.2); color: var(--danger); }
.toast.info .toast-icon { background: rgba(99,102,241,0.2); color: var(--primary-light); }
.toast.warning .toast-icon { background: rgba(245,158,11,0.2); color: var(--warning); }
.toast-message { font-size: 14px; flex: 1; }

/* ==================== CONFIRM DIALOG ==================== */
.confirm-overlay {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(15,23,42,0.8);
    backdrop-filter: blur(8px);
    z-index: 3000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 24px;
}
.confirm-overlay.show { display: flex; animation: fadeIn 0.3s ease; }
.confirm-dialog {
    background: rgba(30,41,59,0.95);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-xl);
    padding: 36px 32px;
    max-width: 400px;
    width: 100%;
    text-align: center;
    animation: modalPop 0.4s ease;
}
.confirm-icon {
    width: 64px; height: 64px;
    margin: 0 auto 20px;
    border-radius: 50%;
    background: rgba(239,68,68,0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    color: var(--danger);
}
.confirm-dialog h3 { font-size: 20px; margin-bottom: 8px; }
.confirm-dialog p { font-size: 15px; color: var(--gray); margin-bottom: 24px; line-height: 1.6; }
.confirm-buttons { display: flex; gap: 12px; justify-content: center; }

/* ==================== RESPONSIVE ==================== */
@media (max-width: 1024px) {
    .teacher-panel { grid-template-columns: 1fr; }
    .footer-content { grid-template-columns: 1fr 1fr; }
    .footer-brand { grid-column: 1 / -1; }
    .quiz-split { grid-template-columns: 1fr 280px; }
    .quiz-right { position: relative; top: 0; }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 64px; left: 0;
        width: 100%;
        background: rgba(15,23,42,0.95);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 16px;
        gap: 4px;
        transform: translateY(-200%);
        transition: var(--transition);
        border-bottom: 1px solid rgba(255,255,255,0.06);
    }
    .nav-menu.active { transform: translateY(0); }
    .nav-menu a { padding: 12px 18px; }
    .nav-toggle { display: flex; }

    .hero-stats { gap: 16px; }
    .stat-divider { display: none; }
    .hero-buttons { flex-direction: column; }
    .hero-buttons .btn { width: 100%; }

    .steps-grid { flex-direction: column; }
    .step-connector { transform: rotate(90deg); }

    .cta-card { padding: 40px 24px; }
    .cta-buttons { flex-direction: column; }
    .cta-buttons .btn { width: 100%; }

    .quiz-split { grid-template-columns: 1fr; }
    .quiz-topbar { flex-direction: column; align-items: stretch; }
    .quiz-title-display { white-space: normal; }
    .quiz-topbar-right { justify-content: center; }
    .quiz-controls { flex-direction: column-reverse; }
    .quiz-controls .btn { width: 100%; }
    .quiz-right { position: relative; top: 0; }

    .footer-content { grid-template-columns: 1fr; }
    .result-modal { padding: 32px 24px; }
    .result-stats { gap: 16px; }
    .result-buttons { flex-direction: column; }
    .result-buttons .btn { width: 100%; }
    .podium { gap: 10px; }
    .podium-col { min-width: 0; }
    .podium-1 .podium-bar { height: 80px; }
    .podium-2 .podium-bar { height: 60px; }
    .podium-3 .podium-bar { height: 45px; }
    .lb-row { grid-template-columns: 50px 1fr 60px 70px; }
    .lb-cell.lb-quiz, .lb-cell.lb-correct, .lb-cell.lb-date { display: none; }
    .leaderboard-footer { flex-direction: column; align-items: stretch; }
}

@media (max-width: 480px) {
    .hero-title { font-size: 1.8rem; }
    .hero-subtitle { font-size: 15px; }
    .section { padding: 60px 16px; }
    .question-container { padding: 20px; }
    .question-text { font-size: 17px; }
    .option-text { font-size: 14px; }
    .editor-toolbar { flex-direction: column; align-items: stretch; }
    .editor-tabs { justify-content: center; }
    .navigator-grid { grid-template-columns: repeat(4, 1fr); }
}