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

:root {
    --qf-font: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --qf-primary: #6366f1;
    --qf-primary-hover: #4f46e5;
    --qf-primary-light: #eef2ff;
    --qf-primary-gradient: linear-gradient(135deg, #6366f1 0%, #4338ca 100%);
    --qf-purple-gradient: linear-gradient(135deg, #8b5cf6 0%, #6d28d9 100%);
    --qf-success-gradient: linear-gradient(135deg, #10b981 0%, #047857 100%);
    --qf-warning-gradient: linear-gradient(135deg, #f59e0b 0%, #b45309 100%);
    --qf-danger-gradient: linear-gradient(135deg, #ef4444 0%, #b91c1c 100%);
    
    --qf-success: #10b981;
    --qf-warning: #f59e0b;
    --qf-danger: #ef4444;
    --qf-info: #06b6d4;
    
    --qf-sidebar-bg: #0f172a;
    --qf-sidebar-hover: rgba(255, 255, 255, 0.06);
    --qf-sidebar-text: #94a3b8;
    --qf-sidebar-text-active: #ffffff;
    --qf-sidebar-border: rgba(255, 255, 255, 0.08);

    --qf-body-bg: #f8fafc;
    --qf-card-bg: #ffffff;
    --qf-border: #e2e8f0;
    --qf-border-subtle: #edf2f7;
    
    --qf-shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.04), 0 1px 2px -1px rgba(0, 0, 0, 0.03);
    --qf-shadow: 0 4px 12px -2px rgba(15, 23, 42, 0.06), 0 2px 6px -1px rgba(15, 23, 42, 0.04);
    --qf-shadow-lg: 0 12px 28px -4px rgba(15, 23, 42, 0.08), 0 6px 12px -2px rgba(15, 23, 42, 0.05);
    --qf-shadow-xl: 0 20px 36px -4px rgba(15, 23, 42, 0.12), 0 10px 16px -3px rgba(15, 23, 42, 0.06);
}

/* Base Body Styling */
body {
    font-family: var(--qf-font);
    background-color: var(--qf-body-bg);
    color: #334155;
    letter-spacing: -0.01em;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 9999px;
}
::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}

/* Typography Enhancements */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--qf-font);
    color: #0f172a;
    font-weight: 700;
    letter-spacing: -0.025em;
}

.fs-7 { font-size: 0.8125rem !important; }
.fs-8 { font-size: 0.75rem !important; }
.tracking-wider { letter-spacing: 0.05em; }

/* Navbar - Frosted Modern Glass */
.navbar-custom {
    background: rgba(255, 255, 255, 0.88);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--qf-border);
    box-shadow: var(--qf-shadow-sm);
    z-index: 1020;
}

.brand-logo {
    font-weight: 800;
    font-size: 1.35rem;
    color: #0f172a;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    letter-spacing: -0.03em;
    transition: opacity 0.2s ease;
}
.brand-logo:hover {
    opacity: 0.9;
}
.brand-icon-box {
    width: 38px;
    height: 38px;
    background: var(--qf-primary-gradient);
    color: #ffffff;
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.35);
}

/* Sidebar - High-End Dark Obsidian Theme */
.sidebar {
    background-color: var(--qf-sidebar-bg);
    border-right: 1px solid var(--qf-sidebar-border);
    min-height: calc(100vh - 61px);
    display: flex;
    flex-direction: column;
}

.sidebar-section-title {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    color: #64748b;
    letter-spacing: 0.08em;
    padding: 14px 20px 6px;
}

.sidebar .nav-link {
    color: var(--qf-sidebar-text);
    font-weight: 500;
    font-size: 0.9rem;
    padding: 10px 14px;
    border-radius: 10px;
    margin: 2px 14px;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
}

.sidebar .nav-link .nav-icon-wrap {
    width: 28px;
    height: 28px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.05);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #94a3b8;
    font-size: 0.95rem;
    transition: all 0.2s ease;
}

.sidebar .nav-link:hover {
    color: var(--qf-sidebar-text-active);
    background-color: var(--qf-sidebar-hover);
    transform: translateX(2px);
}

.sidebar .nav-link:hover .nav-icon-wrap {
    background: rgba(99, 102, 241, 0.2);
    color: #818cf8;
}

.sidebar .nav-link.active {
    color: #ffffff;
    background: var(--qf-primary-gradient);
    font-weight: 600;
    box-shadow: 0 4px 16px rgba(99, 102, 241, 0.35);
}

.sidebar .nav-link.active .nav-icon-wrap {
    background: rgba(255, 255, 255, 0.2);
    color: #ffffff;
}

.sidebar-footer-card {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--qf-sidebar-border);
    border-radius: 12px;
    padding: 14px;
    margin: 14px;
}

/* Cards & Elevated Containers */
.card {
    border: 1px solid var(--qf-border);
    border-radius: 14px;
    background-color: var(--qf-card-bg);
    box-shadow: var(--qf-shadow-sm);
    transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.card.shadow-sm {
    box-shadow: var(--qf-shadow) !important;
}

.card.hover-lift:hover {
    transform: translateY(-3px);
    box-shadow: var(--qf-shadow-lg) !important;
}

.card-header {
    background-color: transparent;
    border-bottom: 1px solid var(--qf-border);
    font-weight: 600;
    padding: 16px 20px;
    color: #0f172a;
}

.card-footer {
    background-color: transparent;
    border-top: 1px solid var(--qf-border);
    padding: 14px 20px;
}

/* Stat & KPI Cards */
.stat-card {
    border: 1px solid var(--qf-border);
    border-radius: 14px;
    background: #ffffff;
    box-shadow: var(--qf-shadow-sm);
    position: relative;
    overflow: hidden;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.stat-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--qf-shadow-lg);
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--qf-primary-gradient);
}

.stat-card.stat-success::before { background: var(--qf-success-gradient); }
.stat-card.stat-warning::before { background: var(--qf-warning-gradient); }
.stat-card.stat-purple::before { background: var(--qf-purple-gradient); }
.stat-card.stat-danger::before { background: var(--qf-danger-gradient); }

.stat-icon-box {
    width: 52px;
    height: 52px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

/* Modern Buttons */
.btn {
    font-family: var(--qf-font);
    font-weight: 600;
    font-size: 0.875rem;
    padding: 8px 16px;
    border-radius: 10px;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background: var(--qf-primary-gradient);
    border: none;
    color: #ffffff;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover, .btn-primary:focus {
    background: linear-gradient(135deg, #4f46e5 0%, #3730a3 100%);
    box-shadow: 0 4px 14px rgba(99, 102, 241, 0.45);
    color: #ffffff;
}

.btn-success {
    background: var(--qf-success-gradient);
    border: none;
    box-shadow: 0 2px 8px rgba(16, 185, 129, 0.3);
}

.btn-success:hover {
    background: linear-gradient(135deg, #059669 0%, #047857 100%);
    box-shadow: 0 4px 14px rgba(16, 185, 129, 0.45);
}

.btn-outline-primary {
    border: 1.5px solid #c7d2fe;
    color: var(--qf-primary);
    background: transparent;
}
.btn-outline-primary:hover {
    background: #eef2ff;
    border-color: var(--qf-primary);
    color: var(--qf-primary);
}

/* Form Controls */
.form-control, .form-select {
    border-radius: 10px;
    border: 1.5px solid var(--qf-border);
    padding: 9px 14px;
    font-size: 0.9rem;
    color: #1e293b;
    background-color: #ffffff;
    transition: all 0.2s ease;
}

.form-control:focus, .form-select:focus {
    border-color: var(--qf-primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.15);
    outline: none;
}

.input-group-text {
    border-radius: 10px;
    border: 1.5px solid var(--qf-border);
    background-color: #f8fafc;
    color: #64748b;
}

/* Badges */
.badge {
    font-family: var(--qf-font);
    font-weight: 600;
    padding: 5px 10px;
    border-radius: 8px;
    letter-spacing: 0.01em;
}

.badge-dot {
    display: inline-block;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    margin-right: 6px;
}

/* Tables */
.table {
    --bs-table-bg: transparent;
    font-size: 0.9rem;
}

.table thead th {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #64748b;
    background: #f8fafc;
    border-bottom: 1px solid var(--qf-border);
    padding: 12px 18px;
}

.table tbody td {
    padding: 14px 18px;
    vertical-align: middle;
    border-bottom: 1px solid var(--qf-border-subtle);
    color: #334155;
}

.table-hover tbody tr:hover {
    background-color: #f8fafc;
}

/* Split-Screen Auth Styles */
.auth-split-layout {
    min-height: 100vh;
    display: flex;
    background: #ffffff;
}

.auth-hero-panel {
    background: radial-gradient(circle at top left, #1e1b4b 0%, #0f172a 60%, #020617 100%);
    color: #ffffff;
    position: relative;
    overflow: hidden;
}

.auth-hero-panel::before {
    content: '';
    position: absolute;
    width: 450px;
    height: 450px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.35) 0%, rgba(99, 102, 241, 0) 70%);
    top: -100px;
    right: -100px;
    filter: blur(40px);
}

.auth-hero-panel::after {
    content: '';
    position: absolute;
    width: 350px;
    height: 350px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(16, 185, 129, 0.25) 0%, rgba(16, 185, 129, 0) 70%);
    bottom: -50px;
    left: -50px;
    filter: blur(35px);
}

.auth-feature-card {
    background: rgba(255, 255, 255, 0.06);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 16px;
    padding: 18px;
    transition: transform 0.2s ease;
}
.auth-feature-card:hover {
    transform: translateY(-2px);
    background: rgba(255, 255, 255, 0.09);
}

.demo-chip {
    cursor: pointer;
    border: 1.5px solid #e2e8f0;
    border-radius: 10px;
    padding: 8px 12px;
    background: #ffffff;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.demo-chip:hover {
    border-color: var(--qf-primary);
    background: #eef2ff;
    transform: translateY(-1px);
}

/* Quiz Taker Runner & Proctoring Interface */
.quiz-header {
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--qf-border);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.timer-box {
    font-size: 1.25rem;
    font-weight: 800;
    font-variant-numeric: tabular-nums;
    color: var(--qf-primary);
    background: #eef2ff;
    padding: 7px 16px;
    border-radius: 10px;
    border: 1.5px solid #c7d2fe;
    box-shadow: var(--qf-shadow-sm);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.timer-danger {
    color: var(--qf-danger) !important;
    background: #fee2e2 !important;
    border-color: #fca5a5 !important;
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.03); opacity: 0.85; }
}

.question-palette-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
    max-height: 380px;
    overflow-y: auto;
    padding: 6px 2px;
}

.palette-btn {
    width: 100%;
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.9rem;
    border-radius: 10px;
    border: 1.5px solid #cbd5e1;
    background: #f8fafc;
    color: #475569;
    cursor: pointer;
    transition: all 0.15s ease;
}

.palette-btn:hover {
    border-color: var(--qf-primary);
    background: #ffffff;
    transform: scale(1.04);
}

.palette-btn.active {
    border: 2px solid var(--qf-primary) !important;
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.3) !important;
    background: #ffffff !important;
    color: var(--qf-primary) !important;
}

.palette-btn.answered {
    background: var(--qf-success-gradient) !important;
    color: #ffffff !important;
    border-color: transparent !important;
}

.palette-btn.review {
    background: var(--qf-warning-gradient) !important;
    color: #ffffff !important;
    border-color: transparent !important;
}

.palette-btn.answered-review {
    background: linear-gradient(135deg, #10b981 50%, #f59e0b 50%) !important;
    color: #ffffff !important;
    border-color: transparent !important;
}

/* Option Cards with Keyboard Shortcut Key Badges */
.option-label {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 20px;
    border: 1.5px solid var(--qf-border);
    border-radius: 12px;
    cursor: pointer;
    margin-bottom: 12px;
    background: #ffffff;
    transition: all 0.15s ease;
    user-select: none;
}

.option-label:hover {
    border-color: #a5b4fc;
    background-color: #faf5ff;
    transform: translateX(3px);
}

.option-label.selected {
    border-color: var(--qf-primary);
    background-color: #eef2ff;
    box-shadow: 0 2px 10px rgba(99, 102, 241, 0.15);
}

.key-badge {
    width: 28px;
    height: 28px;
    border-radius: 8px;
    background: #f1f5f9;
    border: 1px solid #cbd5e1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.8rem;
    color: #475569;
    flex-shrink: 0;
    transition: all 0.15s ease;
}

.option-label.selected .key-badge {
    background: var(--qf-primary);
    color: #ffffff;
    border-color: var(--qf-primary);
}

/* Olympic Podium Styles */
.podium-container {
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: 16px;
    margin: 40px auto 20px;
    max-width: 800px;
    padding: 0 10px;
}

.podium-card {
    text-align: center;
    border-radius: 16px;
    padding: 20px 14px 14px;
    box-shadow: var(--qf-shadow);
    transition: transform 0.2s ease;
    position: relative;
}

.podium-gold {
    background: linear-gradient(180deg, #fefce8 0%, #ffffff 100%);
    border: 2px solid #facc15;
    flex: 1.1;
    z-index: 2;
    transform: translateY(-16px);
    box-shadow: 0 12px 30px rgba(234, 179, 8, 0.2);
}

.podium-silver {
    background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
    border: 1.5px solid #cbd5e1;
    flex: 1;
}

.podium-bronze {
    background: linear-gradient(180deg, #fff7ed 0%, #ffffff 100%);
    border: 1.5px solid #fdba74;
    flex: 1;
}

.podium-avatar {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    margin: -48px auto 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.4rem;
    color: #ffffff;
    box-shadow: var(--qf-shadow);
    position: relative;
}

.podium-gold .podium-avatar {
    width: 76px;
    height: 76px;
    margin-top: -56px;
    background: linear-gradient(135deg, #eab308 0%, #ca8a04 100%);
    border: 4px solid #ffffff;
}

.podium-silver .podium-avatar {
    background: linear-gradient(135deg, #94a3b8 0%, #64748b 100%);
    border: 3px solid #ffffff;
}

.podium-bronze .podium-avatar {
    background: linear-gradient(135deg, #f97316 0%, #c2410c 100%);
    border: 3px solid #ffffff;
}

/* Scorecard & Answer Key */
.score-circle-wrap {
    width: 130px;
    height: 130px;
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    background: #ffffff;
    box-shadow: var(--qf-shadow);
}

.score-circle-wrap.pass {
    border: 8px solid #10b981;
    color: #047857;
}

.score-circle-wrap.fail {
    border: 8px solid #ef4444;
    color: #b91c1c;
}

/* Print Optimization */
@media print {
    .no-print, .sidebar, .navbar-custom, .card-footer, button {
        display: none !important;
    }
    body {
        background: #ffffff !important;
    }
    .card {
        border: 1px solid #ddd !important;
        box-shadow: none !important;
    }
}