/* ============================================
   COMPONENTS - Reusable UI Elements
   ============================================ */

/* === Navigation Bar === */
/* === Navigation Bar (Glassmorphism) === */
.navbar {
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(226, 232, 240, 0.8);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all var(--transition-normal);
}

.navbar-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem var(--spacing-lg);
    /* Slightly slimmer */
    max-width: var(--max-width-2xl);
    margin: 0 auto;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-family: var(--font-heading);
    font-size: 1.35rem;
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.navbar-logo {
    width: 42px;
    height: 42px;
    background: var(--primary-gradient);
    border-radius: var(--border-radius-lg);
    /* Softer corners */
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: var(--font-weight-bold);
    font-size: 1.2rem;
    box-shadow: 0 4px 6px -1px rgba(79, 70, 229, 0.2);
}

.navbar-menu {
    display: flex;
    gap: 2rem;
    list-style: none;
    margin: 0;
}

.navbar-menu a {
    color: var(--text-secondary);
    font-weight: 500;
    transition: all var(--transition-fast);
    text-decoration: none;
    font-size: 0.95rem;
    padding: 0.5rem 0;
    position: relative;
}

.navbar-menu a:hover,
.navbar-menu a.active {
    color: var(--primary-color);
}

/* Underline animation for nav links */
.navbar-menu a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: var(--primary-color);
    transition: width var(--transition-fast);
    border-radius: 2px;
}

.navbar-menu a:hover::after,
.navbar-menu a.active::after {
    width: 100%;
}

.navbar-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.navbar-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    margin: 5px 0;
    transition: var(--transition-fast);
    border-radius: 2px;
}

/* === Buttons (Gradients & Glows) === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-family: var(--font-primary);
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    border-radius: 9999px;
    /* Pill shape */
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    line-height: 1.5;
    gap: 0.5rem;
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(79, 70, 229, 0.4);
    color: white;
    text-decoration: none;
}

.btn-secondary {
    background: var(--secondary-gradient);
    color: white;
    box-shadow: 0 4px 12px rgba(14, 165, 233, 0.3);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(14, 165, 233, 0.4);
    color: white;
    text-decoration: none;
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--border-color);
    color: var(--text-primary);
    border-radius: var(--border-radius-lg);
    /* Rounded rect for outlines */
}

.btn-outline:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background-color: rgba(79, 70, 229, 0.05);
    text-decoration: none;
    transform: translateY(-1px);
}

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

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

/* === Cards (Borderless Modern Look) === */
.card {
    background-color: white;
    border: 1px solid rgba(226, 232, 240, 0.6);
    /* Very subtle border */
    border-radius: 1.5rem;
    /* More rounded */
    padding: 2.5rem;
    box-shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.05);
    /* Soft deep shadow */
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    /* Bouncy transition */
    height: 100%;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 6px;
    background: var(--primary-gradient);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.card:hover {
    box-shadow: 0 20px 60px -15px rgba(0, 0, 0, 0.1);
    transform: translateY(-8px);
    border-color: transparent;
}

.card:hover::after {
    opacity: 1;
}

.card-title {
    font-size: 1.35rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

/* === Hero Section (Dynamic & Large) === */
.hero {
    background: #4f46e5;
    background: radial-gradient(circle at 0% 0%, #4f46e5 0%, #7c3aed 50%, #db2777 100%);
    color: white;
    padding: 8rem 0 6rem;
    /* Massive padding for impact */
    text-align: center;
    position: relative;
    overflow: hidden;
    margin-bottom: 4rem;
}

/* Dynamic floating shapes in background */
.hero::before {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0) 70%);
    border-radius: 50%;
    top: -200px;
    left: -100px;
    animation: float 8s ease-in-out infinite;
}

.hero::after {
    content: '';
    position: absolute;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.08) 0%, rgba(255, 255, 255, 0) 70%);
    border-radius: 50%;
    bottom: -100px;
    right: -100px;
    animation: float 10s ease-in-out infinite reverse;
}

.hero h1 {
    font-size: clamp(3rem, 6vw, 5rem);
    font-weight: 900;
    letter-spacing: -0.04em;
    line-height: 1.1;
    text-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    margin-bottom: 1.5rem;
    opacity: 0;
    animation: fadeInUp 0.8s ease-out forwards;
}

.hero p {
    font-size: 1.35rem;
    color: rgba(255, 255, 255, 0.95);
    max-width: 650px;
    margin: 0 auto 3rem;
    line-height: 1.7;
    opacity: 0;
    animation: fadeInUp 0.8s ease-out 0.2s forwards;
}

.hero-buttons {
    display: flex;
    gap: 1.25rem;
    justify-content: center;
    opacity: 0;
    animation: fadeInUp 0.8s ease-out 0.4s forwards;
}


/* === App CTA (Glossy) === */
.app-cta {
    background: var(--primary-color);
    background: linear-gradient(120deg, #4f46e5, #0ea5e9);
    color: white;
    padding: 4rem 2rem;
    border-radius: 2rem;
    text-align: center;
    box-shadow: 0 20px 40px -10px rgba(79, 70, 229, 0.5);
    margin: 4rem 0;
    position: relative;
    overflow: hidden;
}

.app-cta h3 {
    color: white;
    font-size: 2rem;
    margin-bottom: 1rem;
}

.app-cta p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.1rem;
}

.app-store-badge {
    display: inline-flex;
    align-items: center;
    padding: 0.75rem 1.5rem;
    background-color: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    color: white;
    text-decoration: none;
    font-weight: 600;
    transition: all var(--transition-normal);
    backdrop-filter: blur(4px);
}

.app-store-badge:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-3px);
    color: white;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

/* === MCQ Preview Component === */
.mcq-preview {
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-2xl);
    margin: var(--spacing-2xl) 0;
}

.mcq-preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--border-color);
}

.mcq-preview-title {
    font-size: var(--font-size-2xl);
    color: var(--text-primary);
}

.mcq-preview-badge {
    background-color: var(--accent-color);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
}

.mcq-question {
    background-color: var(--bg-primary);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    border-left: 4px solid var(--primary-color);
}

.mcq-question-number {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    text-align: center;
    line-height: 28px;
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-sm);
    margin-right: var(--spacing-sm);
}

.mcq-question-text {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-medium);
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
}

.mcq-options {
    list-style: none;
    margin: 0;
}

.mcq-option {
    background-color: var(--bg-tertiary);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    border-radius: var(--border-radius-md);
    border: 2px solid transparent;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.mcq-option-letter {
    display: inline-block;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background-color: var(--bg-primary);
    text-align: center;
    line-height: 28px;
    font-weight: var(--font-weight-bold);
    color: var(--text-secondary);
    flex-shrink: 0;
}

.mcq-option.correct {
    background-color: rgba(16, 185, 129, 0.1);
    border-color: var(--success);
}

.mcq-option.correct .mcq-option-letter {
    background-color: var(--success);
    color: white;
}

.mcq-option.correct::after {
    content: '✓ Correct';
    margin-left: auto;
    color: var(--success);
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-sm);
}

.mcq-explanation {
    background-color: rgba(59, 130, 246, 0.05);
    border-left: 4px solid var(--info);
    padding: var(--spacing-md);
    margin-top: var(--spacing-md);
    border-radius: var(--border-radius-sm);
}

.mcq-explanation-title {
    font-weight: var(--font-weight-semibold);
    color: var(--info);
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-sm);
}

.mcq-explanation-text {
    color: var(--text-secondary);
    margin: 0;
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
}

/* === Breadcrumb Navigation === */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    padding: var(--spacing-md) 0;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.breadcrumb a {
    color: var(--primary-color);
    text-decoration: none;
}

.breadcrumb a:hover {
    text-decoration: underline;
}

.breadcrumb-separator {
    color: var(--text-light);
}

/* === Footer === */
.footer {
    background-color: var(--text-primary);
    color: white;
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
    margin-top: var(--spacing-3xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-section h4 {
    color: white;
    margin-bottom: var(--spacing-md);
}

.footer-section ul {
    list-style: none;
    margin: 0;
}

.footer-section ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-section a:hover {
    color: white;
    text-decoration: none;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-lg);
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
    font-size: var(--font-size-sm);
}

.footer-brand-link {
    color: var(--primary-light);
    font-weight: 700;
    text-decoration: none;
}

.footer-brand-link:hover {
    text-decoration: underline;
}

/* === AdSense Ad Zone (Post-Approval) === */
.ad-zone {
    background-color: var(--bg-tertiary);
    border: 1px dashed var(--border-color);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-lg);
    margin: var(--spacing-2xl) 0;
    text-align: center;
    min-height: 250px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.ad-zone-placeholder {
    color: var(--text-light);
    font-size: var(--font-size-sm);
}

/* === Feature Highlight === */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    margin: var(--spacing-2xl) 0;
}

.feature-item {
    text-align: center;
    padding: var(--spacing-xl);
}

.feature-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-md);
    border-radius: var(--border-radius-lg);
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-3xl);
}

.feature-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-sm);
}

.feature-description {
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
}