/* Brain Gauge - Orange/Black/White Color Scheme */

/* CSS Custom Properties (Color Variables) */
:root {
    /* Main Colors */
    --primary-orange: #FF6B35;
    --secondary-orange: #FF8C42;
    --dark-black: #2C2C2C;
    --pure-white: #FFFFFF;
    --light-gray: #F8F9FA;
    --accent-orange: #FFE5D9;
    
    /* Text Colors */
    --text-primary: #2C2C2C;
    --text-secondary: #6C757D;
    --text-white: #FFFFFF;
    
    /* Background Colors */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F8F9FA;
    --bg-dark: #2C2C2C;
    
    /* Border Colors */
    --border-light: #E9ECEF;
    --border-orange: #FF6B35;
    
    /* Shadow Colors */
    --shadow-light: rgba(44, 44, 44, 0.1);
    --shadow-medium: rgba(44, 44, 44, 0.15);
    --shadow-dark: rgba(44, 44, 44, 0.3);
}

/* Map brand to Bootstrap theme variables */
:root {
    --bs-primary: var(--primary-orange);
    --bs-secondary: var(--bg-secondary);
    --bs-body-bg: var(--bg-primary);
    --bs-body-color: var(--text-primary);
    --bs-font-sans-serif: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --bs-border-color: var(--border-light);
    --bs-link-color: var(--primary-orange);
}

/* Dark Mode Colors */
:root.dark-mode {
    --bg-primary: #1A1A1A;
    --bg-secondary: #2C2C2C;
    --bg-dark: #0F0F0F;
    --text-primary: #FFFFFF;
    --text-secondary: #B8B8B8;
    --border-light: #404040;
    --shadow-light: rgba(0, 0, 0, 0.3);
    --shadow-medium: rgba(0, 0, 0, 0.4);
    --shadow-dark: rgba(0, 0, 0, 0.6);
}

/* Ensure header/nav contrast in dark mode */
.dark-mode header,
.dark-mode .bg-body {
    background-color: var(--bg-dark) !important;
}

/* Override Bootstrap navbar-light variables in dark mode */
.dark-mode .navbar-light {
    --bs-navbar-color: rgba(255, 255, 255, 0.85);
    --bs-navbar-hover-color: #ffffff;
    --bs-navbar-active-color: #ffffff;
    --bs-navbar-brand-color: #ffffff;
    --bs-navbar-toggler-border-color: rgba(255, 255, 255, 0.25);
    /* white hamburger icon */
    --bs-navbar-toggler-icon-bg: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3E%3Cpath stroke='rgba(255,255,255,0.55)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3E%3C/svg%3E");
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: color 0.25s ease, background-color 0.25s ease; /* avoid animating layout */
}

/* Disable transitions during instant theme switches to avoid staggered repaint */
html.no-transition, html.no-transition * {
    transition: none !important;
    animation: none !important;
}

/* Utility Classes */
.hidden {
    display: none !important;
}

/* Logo Styling */
.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: inherit;
}

.logo-image {
    height: 70px;
    width: auto;
    object-fit: contain;
}

.logo-text h1 {
    color: var(--primary-orange);
    font-size: 1.8rem;
    font-weight: bold;
    margin: 0;
}

.logo-text .tagline {
    color: var(--text-secondary);
    font-size: 0.9rem;
    display: block;
    margin-top: -4px;
}

/* Button Styles */
.btn-primary {
    background: linear-gradient(135deg, var(--primary-orange), var(--secondary-orange));
    color: var(--text-white);
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(255, 107, 53, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 107, 53, 0.4);
}

.btn-secondary {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 2px solid var(--border-light);
    padding: 10px 20px;
    border-radius: 6px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-secondary:hover {
    border-color: var(--primary-orange);
    color: var(--primary-orange);
}

.btn-cta {
    background: linear-gradient(135deg, var(--primary-orange), var(--secondary-orange));
    color: var(--text-white);
    border: none;
    padding: 18px 36px;
    border-radius: 12px;
    font-size: 1.2rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 8px 24px rgba(255, 107, 53, 0.3);
    display: inline-flex; /* inline to allow horizontal centering */
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
}

.btn-cta:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(255, 107, 53, 0.4);
}

/* Header Styling */
/* Header now uses Bootstrap utilities (sticky-top, shadow, border) */

/* Navigation handled by Bootstrap navbar */

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 6px;
    transition: all 0.3s ease;
}

.nav-link:hover {
    color: var(--primary-orange);
    background-color: var(--accent-orange);
}

.nav-link.active {
    color: var(--primary-orange);
    background-color: var(--accent-orange);
}

/* Main Layout with Side Slots (formerly 'ad' spaces) */
main {
    max-width: 1400px; /* Increased to accommodate ads */
    margin: 0 auto;
    padding: 2rem;
    min-height: calc(100vh - 200px);
}

/* content layout replaced with Bootstrap grid (container-xxl/row/cols) */

.main-content-area {
    min-height: 600px;
    background-color: var(--bg-primary);
    grid-area: center;
}

/* side slots now positioned with Bootstrap utilities */

/* explicit grid areas removed */

/* Outer container for side slot content (renamed from .ad-container) */
.slot-container {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 2rem;
}

/* Visual placeholder (renamed from .ad-placeholder) */
.slot-placeholder {
    width: 100%; /* Fit container to avoid horizontal scroll */
    height: 600px;
    background: linear-gradient(45deg, var(--accent-orange), var(--bg-secondary));
    border: 2px dashed var(--border-orange);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    border-radius: 6px;
}

/* responsive behavior handled by d-none d-xxl-block */

/* Welcome Screen Styling */
.welcome-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 0;
}

.hero-section {
    text-align: center;
    margin-bottom: 4rem;
}

.hero-title {
    font-size: 3rem;
    font-weight: bold;
    color: var(--text-primary);
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.3rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-top: 2rem;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1rem;
    background-color: var(--accent-orange);
    border-radius: 12px;
    min-width: 100px;
}

.stat-number {
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary-orange);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* Features (Bootstrap cards): keep title size + icon + hover */
.features-title { font-size: 2.2rem; color: var(--text-primary); }
.feature-icon { font-size: 3rem; }
.feature-card:hover { transform: translateY(-5px); box-shadow: 0 12px 32px var(--shadow-medium) !important; border-color: var(--primary-orange) !important; }
/* Call to Action Section */
.cta-section {
    text-align: center;
    margin: 4rem 0;
}

.btn-icon {
    font-size: 1.4rem;
    margin-right: 8px;
}

.btn-subtitle {
    font-size: 0.9rem;
    opacity: 0.9;
    font-weight: normal;
}

.cta-info {
    margin-top: 2rem;
}

.mobile-note, .free-note {
    color: var(--text-secondary);
    margin: 0.5rem 0;
}

.free-note {
    font-weight: 600;
    color: var(--primary-orange);
}

/* Progress Section Styling */
.progress-section {
    margin-bottom: 3rem;
}

.progress-container {
    background-color: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: 0 4px 12px var(--shadow-light);
}

.progress { height: 12px; background-color: var(--border-light); border-radius: 6px; margin-bottom: 1rem; }
#progress-fill { background: linear-gradient(90deg, var(--primary-orange), var(--secondary-orange)); transition: width 0.5s ease; }

.progress-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.progress-text {
    font-weight: 600;
    color: var(--text-primary);
}

.difficulty-indicator {
    background-color: var(--accent-orange);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--primary-orange);
    font-weight: 600;
}

/* Timer Styling */
.timer {
    position: sticky;
    top: 60px; /* Below header */
    background-color: var(--bg-secondary);
    padding: 10px 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px var(--shadow-light);
    z-index: 900;
    text-align: center;
    transition: all 0.3s ease;
}

.timer.hidden {
    display: none;
}

.timer-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.timer-label {
    font-weight: 500;
    color: var(--text-secondary);
}

.timer-display {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--text-primary);
    min-width: 50px;
}

.timer-warning {
    color: #DC3545; /* Red warning */
    font-weight: bold;
    margin-left: 10px;
}

.timer-warning.hidden {
    display: none;
}

/* Responsive Timer */
@media (max-width: 768px) {
    .timer {
        top: 50px; /* Adjust for mobile header */
        padding: 8px 15px;
    }
    .timer-display {
        font-size: 1rem;
    }
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0.3; }
}

/* Responsive Design for Mobile */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.2rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .hero-stats {
        gap: 1.5rem;
        flex-wrap: wrap;
    }
    
    /* features layout handled by Bootstrap grid */
    
    .btn-cta {
        padding: 16px 28px;
        font-size: 1.1rem;
    }
    
    .timer {
        position: relative;
        top: auto;
        left: auto;
        transform: none;
        margin: 1rem auto;
        width: fit-content;
    }
}

/* Test Screen Styling */
.test-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 0;
}

.test-header {
    text-align: center;
    margin-bottom: 2rem;
}

.test-title {
    font-size: 2.2rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.test-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Question Section */
.question-section {
    margin: 3rem 0;
}

.question-container {
    background-color: var(--bg-primary);
    padding: 3rem 2rem;
    border-radius: 16px;
    box-shadow: 0 8px 24px var(--shadow-light);
    border: 1px solid var(--border-light);
}

.question-number {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-orange), var(--secondary-orange));
    color: var(--text-white);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
}

.question-text {
    font-size: 1.4rem;
    color: var(--text-primary);
    line-height: 1.5;
    margin-bottom: 1rem;
}

.question-category {
    display: inline-block;
    background-color: var(--accent-orange);
    color: var(--primary-orange);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 2rem;
}

/* Options Styling */
.options-container {
    display: grid;
    gap: 1rem;
    margin-top: 2rem;
}

.option-button {
    background-color: var(--bg-secondary);
    border: 2px solid var(--border-light);
    padding: 1rem 1.5rem;
    border-radius: 12px;
    text-align: left;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
    color: var(--text-primary);
    position: relative;
}

.option-button:hover {
    border-color: var(--primary-orange);
    background-color: var(--accent-orange);
    transform: translateX(8px);
}

.option-button.selected {
    background: linear-gradient(135deg, var(--primary-orange), var(--secondary-orange));
    color: var(--text-white);
    border-color: var(--primary-orange);
    font-weight: 600;
}

.option-button::before {
    content: attr(data-key);
    position: absolute;
    left: -40px;
    top: 50%;
    transform: translateY(-50%);
    background-color: var(--text-secondary);
    color: var(--text-white);
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: bold;
}

.option-button.selected::before {
    background-color: var(--text-white);
    color: var(--primary-orange);
}

/* Brief highlight when selecting via keyboard (1-4) */
.option-button.keyboard-selected {
    outline: 2px solid var(--primary-orange);
    box-shadow: 0 0 0 4px rgba(255, 107, 53, 0.2);
}

/* Navigation Section */
.navigation-section {
    margin-top: 3rem;
}

.test-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.btn-nav {
    background-color: var(--bg-secondary);
    border: 2px solid var(--border-light);
    padding: 12px 24px;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-nav:hover:not(:disabled) {
    border-color: var(--primary-orange);
    background-color: var(--accent-orange);
    color: var(--primary-orange);
}

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

.btn-next {
    background: linear-gradient(135deg, var(--primary-orange), var(--secondary-orange));
    color: var(--text-white);
    border-color: var(--primary-orange);
}

.btn-next:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 107, 53, 0.3);
}

.nav-info {
    text-align: center;
    flex: 1;
    margin: 0 2rem;
}

.keyboard-hint {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: 0;
}

.test-controls {
    text-align: center;
}

/* Results Screen Styling */
.results-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 0;
}

.results-container h1 {
    text-align: center;
    font-size: 2.5rem;
    color: var(--text-primary);
    margin-bottom: 3rem;
}

/* Score Display */
.score-display {
    text-align: center;
    background: linear-gradient(135deg, var(--accent-orange), var(--bg-primary));
    padding: 3rem 2rem;
    border-radius: 20px;
    margin-bottom: 3rem;
    box-shadow: 0 12px 32px var(--shadow-medium);
    border: 2px solid var(--primary-orange);
}

.iq-score {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 1.5rem;
}

#final-score {
    font-size: 4rem;
    font-weight: bold;
    background: linear-gradient(135deg, var(--primary-orange), var(--secondary-orange));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.iq-label {
    font-size: 1.2rem;
    color: var(--text-secondary);
    font-weight: 600;
    margin-top: 0.5rem;
}

#score-interpretation {
    font-size: 1.4rem;
    color: var(--primary-orange);
    font-weight: bold;
    margin: 0;
}

/* Stats Section */
.stats-section {
    background-color: var(--bg-primary);
    padding: 2rem;
    border-radius: 16px;
    box-shadow: 0 8px 24px var(--shadow-light);
    margin-bottom: 3rem;
    border: 1px solid var(--border-light);
}

.stats-section h3 {
    text-align: center;
    font-size: 1.8rem;
    color: var(--text-primary);
    margin-bottom: 2rem;
}

/* Stats table uses Bootstrap table classes */

.insights-section {
    background-color: var(--bg-primary);
    padding: 2rem;
    border-radius: 16px;
    box-shadow: 0 8px 24px var(--shadow-light);
    margin-bottom: 3rem;
    border: 1px solid var(--border-light);
}

.insights-section h3 {
    text-align: center;
    font-size: 1.8rem;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.insights-note {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.insights-canvas-wrap {
    background: var(--bg-secondary);
    border: 1px dashed var(--border-light);
    border-radius: 12px;
    padding: 1rem;
    max-width: 780px;
    margin: 0 auto;
}

.insights-canvas-wrap canvas {
    display: block;
    width: 100%;
    height: auto;
}

/* Wrong Answers Section */
.wrong-answers {
    background-color: var(--bg-primary);
    padding: 2rem;
    border-radius: 16px;
    box-shadow: 0 8px 24px var(--shadow-light);
    margin-bottom: 3rem;
    border: 1px solid var(--border-light);
}

.wrong-answers h3 {
    text-align: center;
    font-size: 1.8rem;
    color: var(--text-primary);
    margin-bottom: 2rem;
}

/* Results Actions */
.results-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin: 2rem 0;
    flex-wrap: wrap;
}

/* Results action buttons are Bootstrap btns */

#retake-btn {
    background: linear-gradient(135deg, var(--primary-orange), var(--secondary-orange));
    color: var(--text-white);
    border-color: var(--primary-orange);
}

#retake-btn:hover {
    box-shadow: 0 4px 12px rgba(255, 107, 53, 0.3);
}

/* Content pages now use Bootstrap card + container */

/* Page System */
.page {
    display: none;
}

.page.active {
    display: block;
}

/* Footer now uses Bootstrap utilities */

/* Disclaimer Styling */
.disclaimer-banner {
    background: linear-gradient(135deg, #FFF3CD, #FFE5D9);
    border: 2px solid var(--primary-orange);
    color: var(--dark-black);
    padding: 16px 24px;
    margin: 24px 0;
    border-radius: 12px;
    text-align: center;
    font-size: 14px;
    line-height: 1.5;
    box-shadow: 0 4px 12px rgba(255, 107, 53, 0.2);
}

.disclaimer-banner.bottom {
    margin-top: 32px;
    background: linear-gradient(135deg, #F8D7DA, #FFE5D9);
    border-color: #DC3545;
}

.disclaimer-banner strong {
    color: var(--primary-orange);
}

/* Responsive Design */
@media (max-width: 768px) {
    /* navbar collapse behavior handled by Bootstrap */
    
    .logo-text h1 {
        font-size: 1.4rem;
    }
    
    .logo-image {
        height: 64px;
    }
    
    main {
        padding: 1rem;
    }
    
    /* header container removed */
}/* Mobile Menu & Enhanced Styles - Add to your styles.css */

/* Header controls are inline in navbar */

/* Dark Mode Toggle Button */
.btn-toggle {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    padding: 8px 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.btn-toggle:hover {
    background-color: var(--accent-orange);
    border-color: var(--primary-orange);
    color: var(--primary-orange);
}

.toggle-icon {
    font-size: 1rem;
}

.toggle-text {
    font-weight: 500;
}

/* Mobile menu handled by Bootstrap navbar toggler */

/* Mobile nav removed */

.ad-block {
    margin: 16px 0;
    min-height: 90px;
}

.ad-label {
    font: 12px/1.2 system-ui;
    opacity: 0.6;
    margin-bottom: 6px;
}

/* Maintain ≥32px spacing around ads when needed */
.ad-gap {
    margin-top: 32px;
    margin-bottom: 32px;
}