/* ==========================================================================
   EngineerHow LMS - Modern & Premium Stylesheet
   Designed with vibrant indigo gradients, sleek card layers, & micro-animations.
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800;900&display=swap');

:root {
    /* Colors */
    --primary: #003366;
    --primary-light: #004d99;
    --primary-dark: #001f40;
    --accent: #ffcc00;
    --accent-light: #ffd633;
    --secondary: #6366f1;
    --secondary-light: #818cf8;
    --success: #10b981;
    --success-bg: #ecfdf5;
    --warning: #f59e0b;
    --error: #ef4444;
    --error-bg: #fef2f2;
    
    /* Gradients */
    --gradient-hero: linear-gradient(135deg, #001f40 0%, #003366 50%, #004d99 100%);
    --gradient-accent: linear-gradient(135deg, #ffcc00 0%, #ffa500 100%);
    --gradient-card: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    --gradient-badge: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
    --gradient-glow: 0 8px 32px 0 rgba(99, 102, 241, 0.15);

    /* Backgrounds & Borders */
    --bg-main: #f1f5f9;
    --bg-dark: #0f172a;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    --border-hover: #cbd5e1;

    /* Text */
    --text-main: #0f172a;
    --text-muted: #475569;
    --text-light: #f8fafc;

    /* Radius & Shadows */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-full: 9999px;
    
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
    --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.25);
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==========================================================================
   Base resets
   ========================================================================== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(99, 102, 241, 0.03) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(0, 51, 102, 0.03) 0%, transparent 40%);
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    color: var(--primary-dark);
}

a {
    color: inherit;
    text-decoration: none;
}

button {
    font-family: inherit;
}

/* ==========================================================================
   Unified Header
   ========================================================================== */
.lms-header {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    height: 70px;
    display: flex;
    align-items: center;
    box-shadow: var(--shadow-sm);
}

.header-container {
    width: 100%;
    max-width: 1300px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 800;
    font-size: 1.4rem;
    color: var(--primary);
    font-family: 'Outfit', sans-serif;
}

.brand-logo {
    width: 42px;
    height: 42px;
    background: var(--gradient-hero);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
    box-shadow: 0 4px 10px rgba(0, 51, 102, 0.25);
    font-size: 1.25rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 28px;
}

.nav-item {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-muted);
    transition: var(--transition);
    position: relative;
    padding: 6px 0;
}

.nav-item:hover, .nav-item.active {
    color: var(--primary);
}

.nav-item::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
}

.nav-item:hover::after, .nav-item.active::after {
    width: 100%;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* User Profile Badge */
.user-menu {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 6px 14px;
    background: #f1f5f9;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: var(--transition);
}

.user-menu:hover {
    background: #e2e8f0;
    border-color: var(--border-hover);
}

.user-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--gradient-hero);
    color: white;
    font-size: 11px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(255,255,255,0.2);
}

.user-name {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-main);
}

.badge-role {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 2px 8px;
    border-radius: var(--radius-full);
    background: #e0f2fe;
    color: #0284c7;
}

.badge-role.guest {
    background: #fef3c7;
    color: #d97706;
}

/* Buttons */
.btn {
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 12px rgba(0, 51, 102, 0.2);
}

.btn-primary:hover {
    background: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 51, 102, 0.3);
}

.btn-accent {
    background: var(--gradient-accent);
    color: var(--primary-dark);
    box-shadow: 0 4px 12px rgba(255, 204, 0, 0.25);
}

.btn-accent:hover {
    background: var(--accent-light);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(255, 204, 0, 0.35);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--border-color);
    color: var(--text-muted);
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(0, 51, 102, 0.02);
}

.btn-danger {
    background: #fee2e2;
    color: var(--error);
}

.btn-danger:hover {
    background: var(--error);
    color: white;
    transform: translateY(-2px);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
    background: var(--gradient-hero);
    color: white;
    padding: 80px 24px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 15% 15%, rgba(255, 204, 0, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 85% 85%, rgba(99, 102, 241, 0.15) 0%, transparent 40%);
    z-index: 1;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 2;
}

.hero h1 {
    font-size: 3.2rem;
    font-weight: 900;
    color: white;
    letter-spacing: -0.03em;
    line-height: 1.15;
    margin-bottom: 20px;
    text-shadow: 0 4px 10px rgba(0,0,0,0.15);
}

.hero h1 span {
    color: var(--accent);
}

.hero p {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 35px;
    font-weight: 400;
    line-height: 1.5;
}

/* Search Bar */
.search-wrapper {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-lg);
    padding: 8px;
    max-width: 600px;
    margin: 0 auto 30px;
    display: flex;
    gap: 8px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}

.search-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: white;
    padding: 0 16px;
    font-size: 1rem;
}

.search-input::placeholder {
    color: rgba(255,255,255,0.6);
}

/* ==========================================================================
   Main Layout & Containers
   ========================================================================== */
.lms-main {
    flex: 1;
    width: 100%;
    max-width: 1300px;
    margin: 0 auto;
    padding: 40px 24px;
}

/* Categories Filter Tabs */
.filter-tabs {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 10px 24px;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.tab-btn:hover {
    background: #f8fafc;
    border-color: var(--border-hover);
    color: var(--primary);
}

.tab-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
    box-shadow: 0 4px 12px rgba(0, 51, 102, 0.15);
}

/* ==========================================================================
   Course Cards Grid
   ========================================================================== */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 30px;
    width: 100%;
}

.course-card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    padding: 30px;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
}

.course-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.course-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--primary);
    opacity: 0.8;
}

.course-card.operator::before { background: var(--primary); }
.course-card.supervisor::before { background: var(--secondary); }
.course-card.manager::before { background: var(--accent); }

.card-tag {
    font-size: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 4px 10px;
    border-radius: var(--radius-full);
    width: fit-content;
    margin-bottom: 20px;
}

.operator .card-tag { background: #eff6ff; color: var(--primary-light); }
.supervisor .card-tag { background: #e0e7ff; color: var(--secondary); }
.manager .card-tag { background: #fffbeb; color: #d97706; }

.card-icon-box {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    font-size: 1.5rem;
    transition: var(--transition);
}

.operator .card-icon-box { background: #f0f7ff; color: var(--primary-light); }
.supervisor .card-icon-box { background: #eef2ff; color: var(--secondary); }
.manager .card-icon-box { background: #fefaf0; color: #d97706; }

.course-card:hover .card-icon-box {
    transform: scale(1.1) rotate(-5deg);
}

.course-card h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
    line-height: 1.3;
}

.course-card p {
    font-size: 0.92rem;
    color: var(--text-muted);
    margin-bottom: 24px;
    flex: 1;
}

.card-meta {
    border-top: 1px solid #f1f5f9;
    padding-top: 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.card-badge {
    background: #f1f5f9;
    padding: 3px 8px;
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 0.75rem;
}

/* User Course Progress Meter inside Card */
.card-progress-bar {
    width: 100%;
    height: 6px;
    background: #e2e8f0;
    border-radius: var(--radius-full);
    margin-top: 14px;
    overflow: hidden;
}

.card-progress-fill {
    height: 100%;
    background: var(--success);
    border-radius: var(--radius-full);
    transition: width 0.5s ease-out;
}

/* ==========================================================================
   Course Details Page
   ========================================================================== */
.details-layout {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 40px;
    align-items: start;
}

.details-main {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    padding: 40px;
    box-shadow: var(--shadow-sm);
}

.details-header {
    margin-bottom: 30px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 30px;
}

.details-header h1 {
    font-size: 2.2rem;
    margin: 12px 0;
}

.details-sidebar {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.sidebar-card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    padding: 30px;
    box-shadow: var(--shadow-sm);
}

.quick-stats-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 24px;
}

.quick-stat-row {
    display: flex;
    justify-content: space-between;
    font-size: 0.95rem;
    border-bottom: 1px solid #f1f5f9;
    padding-bottom: 10px;
}

.quick-stat-row span:first-child {
    color: var(--text-muted);
    font-weight: 500;
}

.quick-stat-row span:last-child {
    font-weight: 700;
    color: var(--primary-dark);
}

.syllabus-list {
    margin: 24px 0;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.syllabus-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    font-size: 0.95rem;
}

.syllabus-item i {
    color: var(--success);
    margin-top: 5px;
}

/* ==========================================================================
   Dashboard Page
   ========================================================================== */
.welcome-banner {
    background: var(--gradient-hero);
    border-radius: var(--radius-lg);
    padding: 40px;
    color: white;
    margin-bottom: 40px;
    box-shadow: 0 10px 30px rgba(0, 51, 102, 0.15);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.welcome-text h2 {
    font-size: 2.2rem;
    color: white;
    margin-bottom: 8px;
}

.welcome-text p {
    color: rgba(255,255,255,0.85);
    font-size: 1.05rem;
}

.stats-bar {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

.stat-box {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    padding: 24px;
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    gap: 20px;
    transition: var(--transition);
}

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

.stat-box-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
}

.stat-box-icon.primary { background: #eff6ff; color: var(--primary); }
.stat-box-icon.success { background: #ecfdf5; color: var(--success); }
.stat-box-icon.warning { background: #fffbeb; color: var(--warning); }
.stat-box-icon.danger { background: #fef2f2; color: var(--error); }

.stat-box-info h4 {
    font-size: 0.85rem;
    text-transform: uppercase;
    color: var(--text-muted);
    font-weight: 600;
    letter-spacing: 0.05em;
}

.stat-box-info p {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-dark);
}

.dashboard-sections {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
}

.dashboard-section {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    padding: 30px;
    box-shadow: var(--shadow-sm);
}

.dashboard-section h3 {
    margin-bottom: 24px;
    font-size: 1.4rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Badges / Certificates */
.badges-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 20px;
}

.badge-card {
    background: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 16px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.badge-card::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 60px;
    height: 60px;
    background: rgba(255, 204, 0, 0.05);
    border-radius: 50%;
    transform: translate(20px, -20px);
}

.badge-card:hover {
    border-color: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.badge-icon {
    font-size: 2.2rem;
    color: var(--accent);
}

.badge-details h5 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.badge-details span {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Tables */
.table-responsive {
    overflow-x: auto;
    width: 100%;
}

.lms-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
    text-align: left;
}

.lms-table th {
    background: #f8fafc;
    padding: 14px 20px;
    font-weight: 700;
    color: var(--text-muted);
    border-bottom: 2px solid var(--border-color);
}

.lms-table td {
    padding: 14px 20px;
    border-bottom: 1px solid #f1f5f9;
}

.lms-table tr:hover {
    background: #fafafa;
}

/* Result Tags */
.status-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
}

.status-pill.passed { background: #d1fae5; color: #065f46; }
.status-pill.failed { background: #fee2e2; color: #991b1b; }

/* Empty state design */
.empty-state {
    text-align: center;
    padding: 40px 20px;
}

.empty-state-icon {
    font-size: 3rem;
    color: #cbd5e1;
    margin-bottom: 16px;
}

/* ==========================================================================
   Authentication Pages
   ========================================================================== */
.auth-page {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 60px 24px;
    flex: 1;
}

.auth-card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    padding: 40px;
    width: 100%;
    max-width: 480px;
    box-shadow: var(--shadow-lg);
}

.auth-header {
    text-align: center;
    margin-bottom: 30px;
}

.auth-header .brand {
    justify-content: center;
    margin-bottom: 16px;
}

.auth-header h2 {
    font-size: 1.8rem;
    margin-bottom: 8px;
}

.auth-header p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.form-group {
    margin-bottom: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.form-control {
    padding: 12px 16px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    outline: none;
    font-size: 0.95rem;
    transition: var(--transition);
    background: #f8fafc;
}

.form-control:focus {
    border-color: var(--primary);
    background: white;
    box-shadow: 0 0 0 3px rgba(0, 51, 102, 0.1);
}

.form-error {
    color: var(--error);
    background: var(--error-bg);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: var(--radius-md);
    padding: 10px 14px;
    font-size: 0.88rem;
    margin-bottom: 20px;
    display: none;
}

.auth-footer {
    margin-top: 24px;
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.auth-footer a {
    color: var(--primary);
    font-weight: 700;
}

.auth-footer a:hover {
    text-decoration: underline;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.lms-footer {
    background: white;
    border-top: 1px solid var(--border-color);
    padding: 24px 0;
    margin-top: auto;
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.lms-footer a {
    color: var(--primary);
    font-weight: 600;
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 992px) {
    .details-layout {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.2rem;
    }
    
    .filter-tabs {
        gap: 10px;
    }
    
    .tab-btn {
        padding: 8px 18px;
        font-size: 0.85rem;
    }
    
    .stats-bar {
        grid-template-columns: 1fr;
    }

    .lms-header {
        height: auto;
        padding: 14px 0;
    }

    .header-container {
        flex-direction: column;
        gap: 14px;
    }

    .nav-links {
        gap: 18px;
    }
}

/* ==========================================================================
   LMS Study Center Advanced Features (Autosave, Themes, Sidebar Collapsing)
   ========================================================================== */

/* Reading Panel Themes */
.theme-light {
    --read-bg: #ffffff;
    --read-text: #0f172a;
    --read-border: #e2e8f0;
    --read-muted: #475569;
    --read-title: #001f40;
}

.theme-sepia {
    --read-bg: #f4ecd8;
    --read-text: #433422;
    --read-border: #e4d7ba;
    --read-muted: #5f4c3a;
    --read-title: #2d2215;
}

.theme-dark {
    --read-bg: #0f172a;
    --read-text: #cbd5e1;
    --read-border: #334155;
    --read-muted: #94a3b8;
    --read-title: #f8fafc;
}

/* Base bindings for reading content */
.reading-container-panel {
    background-color: var(--read-bg, #ffffff) !important;
    color: var(--read-text, #0f172a) !important;
    border-color: var(--read-border, #e2e8f0) !important;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.reading-container-panel h1,
.reading-container-panel h2,
.reading-container-panel h3,
.reading-container-panel h4 {
    color: var(--read-title, #001f40) !important;
}

.reading-container-panel p,
.reading-container-panel li {
    color: var(--read-text, #0f172a) !important;
}

.reading-container-panel .safety-box {
    background-color: var(--read-bg, #ffffff) !important;
    border-color: var(--read-border, #e2e8f0) !important;
    opacity: 0.95;
}

/* Control Bar */
.study-header-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--read-border, #e2e8f0);
    padding-bottom: 16px;
    margin-bottom: 24px;
    gap: 16px;
    flex-wrap: wrap;
    width: 100%;
}

.control-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.control-label {
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--read-muted, #475569);
}

.btn-pill {
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    background: #f1f5f9;
    border: 1px solid var(--border-color);
    color: var(--text-main);
    transition: var(--transition);
}

.btn-pill:hover, .btn-pill.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.btn-pill.theme-btn-light { background: #ffffff; color: #0f172a; border-color: #cbd5e1; }
.btn-pill.theme-btn-sepia { background: #f4ecd8; color: #433422; border-color: #e4d7ba; }
.btn-pill.theme-btn-dark { background: #0f172a; color: #f8fafc; border-color: #334155; }

.btn-pill.theme-btn-light.active { box-shadow: 0 0 0 2px var(--primary); }
.btn-pill.theme-btn-sepia.active { box-shadow: 0 0 0 2px #d97706; }
.btn-pill.theme-btn-dark.active { box-shadow: 0 0 0 2px #3b82f6; }

/* Collapsible Layout */
.study-layout {
    transition: grid-template-columns 0.3s ease;
}

.study-layout.collapsed {
    grid-template-columns: 0px 1fr;
    gap: 0px;
}

.study-layout.collapsed .study-sidebar {
    opacity: 0;
    pointer-events: none;
    width: 0;
    padding: 0;
    overflow: hidden;
    border: none;
}

.toggle-sidebar-btn {
    background: #f1f5f9;
    color: var(--text-main);
    border: 1px solid var(--border-color);
    padding: 8px 14px;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 700;
    font-size: 0.85rem;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
}

.toggle-sidebar-btn:hover {
    background: #cbd5e1;
}

/* Typography scales */
.font-scale-sm { font-size: 0.95rem !important; }
.font-scale-md { font-size: 1.05rem !important; }
.font-scale-lg { font-size: 1.2rem !important; }
.font-scale-xl { font-size: 1.35rem !important; }

/* ==========================================================================
   Home Page — Hero extras, Sections, Steps, Features, CTA, Footer
   ========================================================================== */
.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 204, 0, 0.12);
    border: 1px solid rgba(255, 204, 0, 0.35);
    color: var(--accent);
    font-size: 0.82rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 6px 16px;
    border-radius: var(--radius-full);
    margin-bottom: 22px;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 18px;
    flex-wrap: wrap;
    margin-top: 10px;
}

.hero-stat {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-md);
    padding: 14px 26px;
    min-width: 130px;
    backdrop-filter: blur(6px);
}

.hero-stat strong {
    display: block;
    font-family: 'Outfit', sans-serif;
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--accent);
    line-height: 1.2;
}

.hero-stat span {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.75);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Section headings */
.section-heading {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 40px;
}

.section-heading h2 {
    font-size: 2.1rem;
    letter-spacing: -0.02em;
    margin-bottom: 10px;
}

.section-heading p {
    color: var(--text-muted);
    font-size: 1.05rem;
}

/* Filter tab counters */
.tab-count {
    display: inline-block;
    background: rgba(0, 51, 102, 0.08);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 800;
    padding: 1px 8px;
    margin-left: 6px;
}

.tab-btn.active .tab-count {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

/* Continue-learning strip */
.continue-strip {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-left: 5px solid var(--accent);
    border-radius: var(--radius-lg);
    padding: 20px 26px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
    box-shadow: var(--shadow-md);
}

.continue-info {
    display: flex;
    align-items: center;
    gap: 16px;
}

.continue-label {
    font-size: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--warning);
}

.continue-info h4 {
    font-size: 1.15rem;
    margin: 2px 0;
}

.continue-meta {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* How-it-works steps */
.howitworks-section {
    background: white;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 30px;
}

.step-card {
    position: relative;
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 34px 28px 28px;
    transition: var(--transition);
}

.step-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--border-hover);
}

.step-num {
    position: absolute;
    top: -16px;
    left: 26px;
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: var(--gradient-accent);
    color: var(--primary-dark);
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 10px rgba(255, 204, 0, 0.35);
}

.step-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-md);
    background: #eff6ff;
    color: var(--primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    margin-bottom: 18px;
}

.step-card h4 {
    font-size: 1.15rem;
    margin-bottom: 10px;
}

.step-card p {
    font-size: 0.92rem;
    color: var(--text-muted);
}

/* Feature cards */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
    margin-bottom: 50px;
}

.feature-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-light);
}

.feature-icon {
    width: 46px;
    height: 46px;
    border-radius: var(--radius-md);
    background: var(--gradient-hero);
    color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    margin-bottom: 16px;
}

.feature-card h4 {
    font-size: 1.05rem;
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* CTA band */
.cta-band {
    background: var(--gradient-hero);
    border-radius: var(--radius-lg);
    padding: 40px 44px;
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 24px;
    flex-wrap: wrap;
    box-shadow: 0 12px 32px rgba(0, 31, 64, 0.25);
}

.cta-band h3 {
    color: white;
    font-size: 1.5rem;
    margin-bottom: 6px;
}

.cta-band p {
    color: rgba(255, 255, 255, 0.8);
}

.cta-actions {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

.btn-outline-light {
    background: transparent;
    border: 2px solid rgba(255, 255, 255, 0.4);
    color: white;
    padding: 12px 24px;
    border-radius: var(--radius-md);
    font-weight: 700;
    font-size: 0.95rem;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
}

.btn-outline-light:hover {
    border-color: white;
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

/* Multi-column footer */
.footer-grid {
    max-width: 1300px;
    margin: 0 auto;
    padding: 40px 24px 24px;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.2fr;
    gap: 40px;
    text-align: left;
}

.footer-col h5 {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--primary-dark);
    margin-bottom: 14px;
}

.footer-col a {
    display: block;
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 10px;
    font-weight: 500;
    transition: var(--transition);
}

.footer-col a:hover {
    color: var(--primary);
}

.footer-brand-col p {
    font-size: 0.88rem;
    color: var(--text-muted);
    line-height: 1.6;
    max-width: 320px;
}

.footer-brand-col .brand {
    display: inline-flex;
}

.footer-tag {
    display: inline-block;
    background: #f1f5f9;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
    padding: 4px 10px;
    margin: 0 6px 8px 0;
}

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding: 18px 24px 0;
    text-align: center;
}

@media (max-width: 900px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 560px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }
    .hero-stat {
        min-width: 110px;
        padding: 10px 16px;
    }
    .btn-label-hide-sm {
        display: none;
    }
}

/* Progress bar inside panel */
.panel-progress {
    height: 6px;
    width: 100%;
    background: #e2e8f0;
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: 24px;
}

.panel-progress-fill {
    height: 100%;
    background: var(--primary);
    width: 0%;
    transition: width 0.3s ease;
}