:root {
    --primary: #0B192C;
    --primary-deep: #060D18;
    --primary-light: #1E3E62;
    --primary-accent: #2563EB;
    --accent-gold: #F59E0B;
    --accent-gold-glow: #FBBF24;
    --accent-gold-light: #FEF3C7;
    --accent-gold-dark: #B45309;
    --accent-cyan: #06B6D4;
    --accent-cyan-glow: #22D3EE;
    --bg-page: #F8FAFC;
    --surface-card: #FFFFFF;
    --border-color: #E2E8F0;
    --border-card: rgba(226, 232, 240, 0.8);
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-muted: #94A3B8;
    
    /* Exam Status Colors */
    --status-answered: #059669;
    --status-not-answered: #EA580C;
    --status-marked: #7C3AED;
    --status-ans-marked: #6366F1;
    --status-not-visited: #94A3B8;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --shadow-subtle: 0 4px 20px -2px rgba(11, 25, 44, 0.06);
    --shadow-premium: 0 20px 40px -15px rgba(11, 25, 44, 0.12);
    --shadow-glow: 0 0 25px rgba(245, 158, 11, 0.25);
}

/* Base Global Styles */
* {
    box-sizing: border-box;
}

body {
    font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-page);
    color: var(--text-primary);
    overflow-x: hidden;
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

main {
    flex: 1;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: #F1F5F9;
}
::-webkit-scrollbar-thumb {
    background: #CBD5E1;
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: #94A3B8;
}

/* Header & Glass Navigation */
.navbar-adre {
    background: rgba(11, 25, 44, 0.95);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    transition: all 0.3s ease;
    z-index: 1050;
}

.brand-logo-img {
    height: 44px;
    width: 44px;
    object-fit: contain;
    border-radius: 10px;
    filter: drop-shadow(0 2px 8px rgba(245, 158, 11, 0.3));
    transition: transform 0.3s ease;
}

.brand-logo-img:hover {
    transform: scale(1.05);
}

.brand-title {
    font-weight: 800;
    letter-spacing: -0.02em;
    color: #FFFFFF;
    font-size: 1.25rem;
}

.brand-title span {
    color: var(--accent-gold);
}

.nav-link-adre {
    color: #E2E8F0 !important;
    font-weight: 600;
    font-size: 0.95rem;
    padding: 0.5rem 1rem !important;
    border-radius: 8px;
    transition: all 0.2s ease;
}

.nav-link-adre:hover, .nav-link-adre.active {
    color: #FFFFFF !important;
    background: rgba(255, 255, 255, 0.1);
}

/* Hero Section */
.hero-gradient-bg {
    background: radial-gradient(circle at 80% 20%, #1E3E62 0%, #0B192C 60%, #060D18 100%);
    position: relative;
    overflow: hidden;
    color: #FFFFFF;
    padding: 5rem 0 6rem;
}

.hero-gradient-bg::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(245, 158, 11, 0.15) 0%, rgba(11, 25, 44, 0) 70%);
    border-radius: 50%;
    pointer-events: none;
    animation: floatGlow 8s ease-in-out infinite alternate;
}

@keyframes floatGlow {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(-30px, 30px) scale(1.15); }
}

.badge-gold {
    background: rgba(245, 158, 11, 0.15);
    border: 1px solid rgba(245, 158, 11, 0.4);
    color: #FCD34D;
    font-weight: 700;
    font-size: 0.85rem;
    padding: 0.4rem 0.9rem;
    border-radius: 50px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.hero-title {
    font-weight: 800;
    font-size: 2.75rem;
    line-height: 1.15;
    letter-spacing: -0.03em;
}

@media (min-width: 992px) {
    .hero-title { font-size: 3.5rem; }
}

.hero-title-highlight {
    background: linear-gradient(135deg, #FDE68A 0%, #F59E0B 50%, #FBBF24 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Premium Button Styles */
.btn-gold {
    background: linear-gradient(135deg, #F59E0B 0%, #D97706 100%);
    color: #060D18;
    font-weight: 700;
    border: none;
    border-radius: 12px;
    padding: 0.75rem 1.6rem;
    box-shadow: 0 4px 20px rgba(245, 158, 11, 0.35);
    transition: all 0.25s ease;
}

.btn-gold:hover {
    color: #000000;
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(245, 158, 11, 0.5);
}

.btn-outline-light-custom {
    background: rgba(255, 255, 255, 0.06);
    color: #FFFFFF;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    backdrop-filter: blur(8px);
    transition: all 0.25s ease;
}

.btn-outline-light-custom:hover {
    background: rgba(255, 255, 255, 0.15);
    color: #FFFFFF;
    border-color: rgba(255, 255, 255, 0.4);
    transform: translateY(-2px);
}

/* Cards & Surfaces */
.card-premium {
    background: var(--surface-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-subtle);
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    overflow: hidden;
}

.card-premium:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-premium);
    border-color: #CBD5E1;
}

.card-premium-gold {
    border-color: rgba(245, 158, 11, 0.35);
    background: linear-gradient(180deg, #FFFDF8 0%, #FFFFFF 100%);
}

.card-premium-gold:hover {
    border-color: var(--accent-gold);
    box-shadow: 0 15px 35px -10px rgba(245, 158, 11, 0.2);
}

.stat-icon-box {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

/* Category Filter Tabs */
.category-pill-btn {
    padding: 0.6rem 1.4rem;
    font-weight: 700;
    font-size: 0.95rem;
    border-radius: 50px;
    border: 1px solid var(--border-color);
    background: #FFFFFF;
    color: var(--text-secondary);
    transition: all 0.2s ease;
    cursor: pointer;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.category-pill-btn.active, .category-pill-btn:hover {
    background: var(--primary);
    color: #FFFFFF;
    border-color: var(--primary);
    box-shadow: 0 4px 12px rgba(11, 25, 44, 0.15);
}

/* ==============================================================================
   Exam Engine Styles (Web Test Runner)
   ============================================================================== */
.exam-runner-wrapper {
    background: #F1F5F9;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.exam-top-bar {
    background: var(--primary);
    color: #FFFFFF;
    padding: 0.75rem 1.5rem;
    border-bottom: 2px solid var(--accent-gold);
    position: sticky;
    top: 0;
    z-index: 1040;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.timer-box {
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.25);
    color: #FFFFFF;
    padding: 0.35rem 1rem;
    border-radius: 50px;
    font-family: monospace, monospace;
    font-size: 1.15rem;
    font-weight: 800;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
}

.timer-box.timer-urgent {
    background: #E11D48;
    color: #FFFFFF;
    border-color: #FDA4AF;
    animation: urgentPulse 1s infinite alternate;
}

@keyframes urgentPulse {
    0% { transform: scale(1); box-shadow: 0 0 0 0 rgba(225, 29, 72, 0.7); }
    100% { transform: scale(1.05); box-shadow: 0 0 15px 4px rgba(225, 29, 72, 0.5); }
}

.question-card {
    background: #FFFFFF;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-subtle);
    border: 1px solid var(--border-color);
    padding: 2rem;
    margin-bottom: 1.5rem;
}

.option-btn-card {
    border: 1.5px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem 1.25rem;
    margin-bottom: 0.85rem;
    cursor: pointer;
    background: #FFFFFF;
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.option-btn-card:hover {
    border-color: #94A3B8;
    background: #F8FAFC;
    transform: translateX(4px);
}

.option-btn-card.selected {
    border-color: var(--primary-accent);
    background: #EFF6FF;
    box-shadow: 0 2px 10px rgba(37, 99, 235, 0.12);
}

.option-badge {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    background: #F1F5F9;
    color: var(--text-primary);
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all 0.2s ease;
}

.option-btn-card.selected .option-badge {
    background: var(--primary-accent);
    color: #FFFFFF;
}

/* Palette Buttons */
.palette-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
}

.palette-btn {
    width: 100%;
    aspect-ratio: 1;
    border: none;
    border-radius: 10px;
    font-weight: 700;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.15s ease;
}

.palette-btn:hover {
    transform: scale(1.08);
    filter: brightness(0.95);
}

.palette-btn.current {
    outline: 3px solid #000000;
    outline-offset: 2px;
}

/* Palette Status Color Codes */
.bg-status-answered { background-color: var(--status-answered) !important; color: #FFFFFF !important; }
.bg-status-not-answered { background-color: var(--status-not-answered) !important; color: #FFFFFF !important; }
.bg-status-marked { background-color: var(--status-marked) !important; color: #FFFFFF !important; }
.bg-status-ans-marked { background-color: var(--status-ans-marked) !important; color: #FFFFFF !important; }
.bg-status-not-visited { background-color: #E2E8F0 !important; color: #475569 !important; }

/* Mobile Bottom Navigation Bar */
.mobile-bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 62px;
    background: #FFFFFF;
    border-top: 1px solid #E2E8F0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    z-index: 1040;
    box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.06);
}

.mobile-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: #64748B;
    font-size: 0.72rem;
    font-weight: 600;
    gap: 2px;
    transition: color 0.2s;
}

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

.mobile-nav-item.active {
    color: var(--primary-accent);
}

@media (min-width: 992px) {
    .mobile-bottom-nav {
        display: none !important;
    }
}

/* Solution Review Badge */
.solution-status-badge {
    padding: 0.35rem 0.85rem;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 700;
}

/* ==============================================================================
 * OTP Verification System - Premium UI Styles
 * ============================================================================== */
.otp-inputs-wrapper {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin: 1.5rem 0;
}
@media (min-width: 576px) {
    .otp-inputs-wrapper {
        gap: 12px;
    }
}
.otp-digit-box {
    width: 48px;
    height: 56px;
    font-size: 1.6rem;
    font-weight: 700;
    text-align: center;
    border: 2px solid #E2E8F0;
    border-radius: 12px;
    background: #F8FAFC;
    color: #0B192C;
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    outline: none;
    -moz-appearance: textfield;
}
.otp-digit-box::-webkit-outer-spin-button,
.otp-digit-box::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}
.otp-digit-box:focus {
    border-color: #F59E0B;
    background: #FFFFFF;
    box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.15);
    transform: translateY(-2px);
}
.otp-digit-box.filled {
    border-color: #0B192C;
    background: #FFFFFF;
}
.otp-digit-box.error {
    border-color: #EF4444 !important;
    background: #FEF2F2 !important;
    animation: shakeBox 0.4s ease;
}
@keyframes shakeBox {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-6px); }
    40%, 80% { transform: translateX(6px); }
}
.step-transition {
    transition: opacity 0.3s ease, transform 0.3s ease;
}
.step-hidden {
    display: none !important;
    opacity: 0;
    transform: translateY(10px);
}
.success-checkmark-circle {
    width: 68px;
    height: 68px;
    border-radius: 50%;
    background: #ECFDF5;
    border: 2.5px solid #10B981;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.25rem;
    animation: scaleCheck 0.45s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
@keyframes scaleCheck {
    0% { transform: scale(0.6); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}