/* ==========================================================================
   EduSphere LMS — Core Design System & Dynamic Theme Token Architecture
   ========================================================================== */

/* 1. Global CSS Custom Properties (Theme Defaults) */
:root {
    /* Brand & Accent Colors */
    --color-primary: #2563EB;
    --color-primary-hover: #1D4ED8;
    --color-primary-light: rgba(37, 99, 235, 0.1);
    --color-secondary: #475569;
    --color-accent: #F59E0B;
    --color-accent-hover: #D97706;

    /* Base Surfaces & Backgrounds */
    --color-bg: #F8FAFC;
    --color-surface: #FFFFFF;
    --color-surface-hover: #F1F5F9;
    --color-surface-alt: #F3F4F6;

    /* Typography Colors */
    --color-text: #0F172A;
    --color-text-muted: #64748B;
    --color-text-light: #94A3B8;
    --color-text-inverse: #FFFFFF;

    /* Borders & Outlines */
    --color-border: #E2E8F0;
    --color-border-hover: #CBD5E1;

    /* Status & Feedback Colors */
    --color-success: #10B981;
    --color-success-bg: #ECFDF5;
    --color-warning: #F59E0B;
    --color-warning-bg: #FFFBEB;
    --color-error: #EF4444;
    --color-error-bg: #FEF2F2;
    --color-info: #3B82F6;
    --color-info-bg: #EFF6FF;

    /* Typography Stack */
    --font-heading: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-code: 'JetBrains Mono', 'Fira Code', monospace;

    /* Layout & Dimensions */
    --content-max-width: 1280px;
    --header-height: 72px;
    --sidebar-width: 260px;
    --radius-sm: 6px;
    --radius: 10px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-full: 9999px;

    /* Shadows & Elevation */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-card: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.07), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.06);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
}

/* 2. Reset & Base Typography */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-body);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--color-text);
    line-height: 1.3;
    font-weight: 700;
    letter-spacing: -0.02em;
}

h1 { font-size: 2.25rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.35rem; }
h4 { font-size: 1.15rem; }
h5 { font-size: 1rem; }
h6 { font-size: 0.875rem; }

p { margin-bottom: 1rem; }
p:last-child { margin-bottom: 0; }

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

img, svg {
    display: block;
    max-width: 100%;
    height: auto;
}

/* 3. Containers & Grid System */
.container {
    width: 100%;
    max-width: var(--content-max-width);
    margin-left: auto;
    margin-right: auto;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
}

.grid {
    display: grid;
    gap: 1.5rem;
}

.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

@media (max-width: 1024px) {
    .grid-cols-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .grid-cols-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
    .grid-cols-4, .grid-cols-3, .grid-cols-2 { grid-template-columns: 1fr; }
}

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-1 { gap: 0.25rem; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 0.75rem; }
.gap-4 { gap: 1rem; }
.gap-6 { gap: 1.5rem; }
.flex-wrap { flex-wrap: wrap; }
.flex-1 { flex: 1 1 0%; }

/* 4. Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.65rem 1.25rem;
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius);
    border: 1px solid transparent;
    cursor: pointer;
    text-align: center;
    transition: all var(--transition-fast);
    line-height: 1.25;
    user-select: none;
}

.btn-primary {
    background-color: var(--color-primary);
    color: #FFFFFF !important;
    box-shadow: 0 2px 4px rgba(37, 99, 235, 0.2);
}

.btn-primary:hover {
    background-color: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(37, 99, 235, 0.3);
}

.btn-secondary {
    background-color: var(--color-surface);
    color: var(--color-text) !important;
    border-color: var(--color-border);
}

.btn-secondary:hover {
    background-color: var(--color-surface-hover);
    border-color: var(--color-border-hover);
}

.btn-outline {
    background-color: transparent;
    color: var(--color-primary) !important;
    border-color: var(--color-primary);
}

.btn-outline:hover {
    background-color: var(--color-primary-light);
}

.btn-sm {
    padding: 0.4rem 0.85rem;
    font-size: 0.85rem;
    border-radius: var(--radius-sm);
}

.btn-lg {
    padding: 0.85rem 1.75rem;
    font-size: 1.05rem;
    border-radius: var(--radius-md);
}

.btn-block {
    display: flex;
    width: 100%;
}

/* 5. Cards & Containers */
.card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-card);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

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

/* 6. Forms & Inputs */
.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 0.4rem;
}

.form-control {
    width: 100%;
    padding: 0.65rem 0.95rem;
    font-family: var(--font-body);
    font-size: 0.95rem;
    color: var(--color-text);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.form-text {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-top: 0.35rem;
}

.form-error {
    font-size: 0.825rem;
    color: var(--color-error);
    margin-top: 0.35rem;
}

.form-check {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.form-check input[type="checkbox"],
.form-check input[type="radio"] {
    width: 1.1rem;
    height: 1.1rem;
    accent-color: var(--color-primary);
    cursor: pointer;
}

/* 7. Alerts & Badges */
.alert {
    padding: 1rem 1.25rem;
    border-radius: var(--radius);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.925rem;
}

.alert-success {
    background-color: var(--color-success-bg);
    color: #065F46;
    border: 1px solid #A7F3D0;
}

.alert-error {
    background-color: var(--color-error-bg);
    color: #991B1B;
    border: 1px solid #FECACA;
}

.alert-warning {
    background-color: var(--color-warning-bg);
    color: #92400E;
    border: 1px solid #FDE68A;
}

.alert-info {
    background-color: var(--color-info-bg);
    color: #1E40AF;
    border: 1px solid #BFDBFE;
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.65rem;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    border-radius: var(--radius-full);
}

.badge-primary {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
}

.badge-success {
    background-color: var(--color-success-bg);
    color: var(--color-success);
}

.badge-warning {
    background-color: var(--color-warning-bg);
    color: var(--color-warning);
}

.badge-secondary {
    background-color: var(--color-surface-hover);
    color: var(--color-text-muted);
}

/* 8. Public Header & Navigation */
.site-header {
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    height: var(--header-height);
    position: sticky;
    top: 0;
    z-index: 50;
    display: flex;
    align-items: center;
}

.site-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    font-family: var(--font-heading);
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--color-text);
}

.brand-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #FFFFFF;
    font-weight: 900;
    box-shadow: 0 2px 5px rgba(0,0,0,0.15);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    list-style: none;
}

.nav-link {
    font-weight: 500;
    color: var(--color-text);
    font-size: 0.95rem;
    transition: color var(--transition-fast);
}

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

/* 9. Dropdowns & Controls */
.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 0.5rem;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    min-width: 180px;
    padding: 0.5rem 0;
    display: none;
    z-index: 100;
}

.dropdown:hover .dropdown-menu,
.dropdown:focus-within .dropdown-menu {
    display: block;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.5rem 1rem;
    color: var(--color-text);
    font-size: 0.9rem;
}

.dropdown-item:hover {
    background-color: var(--color-surface-hover);
    color: var(--color-primary);
}

/* 10. Footer */
.site-footer {
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: 3.5rem 0 2rem;
    margin-top: auto;
}

.footer-bottom {
    margin-top: 2.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

/* 11. Theme Switcher Bar */
.theme-selector-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.35rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    background-color: var(--color-surface);
    font-size: 0.825rem;
    font-weight: 500;
    cursor: pointer;
}

/* 12. Helper Utilities */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--color-text-muted); }
.text-primary { color: var(--color-primary); }
.text-sm { font-size: 0.875rem; }
.text-xs { font-size: 0.75rem; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.25rem; }
.text-2xl { font-size: 1.5rem; }
.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.font-medium { font-weight: 500; }
.py-4 { padding-top: 1rem; padding-bottom: 1rem; }
.py-8 { padding-top: 2rem; padding-bottom: 2rem; }
.py-12 { padding-top: 3rem; padding-bottom: 3rem; }
.py-16 { padding-top: 4rem; padding-bottom: 4rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }
.mb-8 { margin-bottom: 2rem; }
.mt-4 { margin-top: 1rem; }
.mt-6 { margin-top: 1.5rem; }
.mt-8 { margin-top: 2rem; }
.w-full { width: 100%; }

/* ==========================================================================
   13. Mobile Responsive Design & Mobile Bottom Navigation Bar
   ========================================================================== */

/* Mobile Bottom Navigation Bar (Hidden on Desktop) */
.mobile-bottom-nav {
    display: none;
}

.mobile-nav-toggle-btn {
    display: none;
}

.mobile-drawer-backdrop {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(4px);
    z-index: 998;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.mobile-drawer-backdrop.active {
    display: block;
    opacity: 1;
}

.mobile-drawer {
    position: fixed;
    top: 0;
    right: -320px;
    width: 300px;
    max-width: 85vw;
    height: 100%;
    background-color: var(--color-surface);
    border-left: 1px solid var(--color-border);
    box-shadow: -10px 0 25px rgba(0, 0, 0, 0.15);
    z-index: 999;
    display: flex;
    flex-direction: column;
    transition: right 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    overflow-y: auto;
}

.mobile-drawer.active {
    right: 0;
}

.mobile-drawer-header {
    padding: 1.25rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--color-border);
    background-color: var(--color-surface-hover);
}

.mobile-drawer-body {
    padding: 1.25rem;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.mobile-drawer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.mobile-drawer-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    color: var(--color-text);
    font-weight: 500;
    font-size: 0.95rem;
    transition: all var(--transition-fast);
}

.mobile-drawer-link:hover, .mobile-drawer-link.active {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    font-weight: 600;
}

.mobile-drawer-section-title {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    margin-bottom: 0.5rem;
    padding-left: 0.5rem;
}

/* Screen Width < 768px Rules */
@media (max-width: 768px) {
    body {
        padding-bottom: calc(64px + env(safe-area-inset-bottom, 0px));
    }

    .site-nav .nav-menu {
        display: none;
    }

    .site-nav .desktop-auth-btns {
        display: none;
    }

    .mobile-nav-toggle-btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 40px;
        height: 40px;
        border-radius: var(--radius);
        background-color: var(--color-surface-hover);
        border: 1px solid var(--color-border);
        color: var(--color-text);
        cursor: pointer;
    }

    /* Mobile Bottom Navigation Bar */
    .mobile-bottom-nav {
        display: flex;
        align-items: center;
        justify-content: space-around;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        height: calc(60px + env(safe-area-inset-bottom, 0px));
        padding-bottom: env(safe-area-inset-bottom, 0px);
        background: rgba(255, 255, 255, 0.92);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        border-top: 1px solid var(--color-border);
        box-shadow: 0 -4px 15px rgba(0, 0, 0, 0.05);
        z-index: 950;
    }

    /* Dark theme support for bottom bar */
    [data-theme="dark-pro"] .mobile-bottom-nav,
    [data-theme="dark"] .mobile-bottom-nav {
        background: rgba(15, 23, 42, 0.92);
    }

    .mobile-nav-item {
        flex: 1;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        height: 100%;
        color: var(--color-text-muted);
        text-decoration: none;
        font-size: 0.68rem;
        font-weight: 500;
        gap: 0.2rem;
        transition: color var(--transition-fast), transform var(--transition-fast);
        position: relative;
        background: transparent;
        border: none;
        cursor: pointer;
        padding: 0.25rem 0;
    }

    .mobile-nav-item:active {
        transform: scale(0.95);
    }

    .mobile-nav-item.active {
        color: var(--color-primary);
        font-weight: 700;
    }

    .mobile-nav-item.active .mobile-nav-icon {
        color: var(--color-primary);
        transform: translateY(-1px);
    }

    .mobile-nav-icon {
        width: 22px;
        height: 22px;
        display: flex;
        align-items: center;
        justify-content: center;
        transition: transform var(--transition-fast);
    }

    .mobile-nav-icon svg {
        width: 22px;
        height: 22px;
    }

    .mobile-nav-badge {
        position: absolute;
        top: 6px;
        right: 28%;
        width: 8px;
        height: 8px;
        background-color: var(--color-accent);
        border-radius: 50%;
        border: 2px solid var(--color-surface);
    }

    /* Responsive Typography & Spacing */
    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.45rem; }
    h3 { font-size: 1.2rem; }

    .container {
        padding-left: 1rem;
        padding-right: 1rem;
    }

    /* Stack cards in single column on mobile */
    .grid-cols-4, .grid-cols-3, .grid-cols-2 {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    /* Hero section padding */
    .hero-section {
        padding: 2.5rem 0 2rem;
        text-align: center;
    }

    .hero-actions {
        justify-content: center;
        flex-direction: column;
        gap: 0.75rem;
    }

    .hero-actions .btn {
        width: 100%;
    }
}

/* ==========================================================================
   14. Modern Minimal Course Catalog & Category Bar (10MS / Udemy Style)
   ========================================================================== */
.catalog-hero-bar {
    background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-bg) 100%);
    border-bottom: 1px solid var(--color-border);
    padding: 2.5rem 0 1.5rem;
}

.category-10ms-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    margin: 1rem 0 0.5rem;
}

.category-scroll-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    color: var(--color-text);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 10;
    transition: all 0.2s ease;
}

.category-scroll-arrow:hover {
    background: var(--color-primary);
    color: #FFFFFF;
    border-color: var(--color-primary);
    transform: translateY(-50%) scale(1.08);
}

.category-scroll-arrow.left {
    left: -12px;
}

.category-scroll-arrow.right {
    right: -12px;
}

.category-10ms-scroll {
    display: flex;
    gap: 0.65rem;
    overflow-x: auto;
    scroll-behavior: smooth;
    padding: 0.5rem 0.25rem 0.85rem;
    width: 100%;
    scrollbar-width: thin;
    scrollbar-color: var(--color-border) transparent;
    -webkit-overflow-scrolling: touch;
}

.category-10ms-scroll::-webkit-scrollbar {
    height: 6px;
}

.category-10ms-scroll::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.04);
    border-radius: 9999px;
}

.category-10ms-scroll::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 9999px;
}

.category-10ms-scroll::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary);
}

.category-10ms-card {
    width: 118px;
    min-width: 118px;
    max-width: 118px;
    height: 92px;
    background: var(--color-surface);
    border: 1.5px solid var(--color-border);
    border-radius: 12px;
    padding: 0.55rem 0.45rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    text-decoration: none;
    color: var(--color-text);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    flex-shrink: 0;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.03);
    cursor: pointer;
}

.category-10ms-card:hover {
    border-color: var(--color-primary);
    background: var(--color-surface);
    color: var(--color-primary);
    transform: translateY(-3px);
    box-shadow: 0 8px 16px -4px rgba(0, 0, 0, 0.08);
}

.category-10ms-card.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #FFFFFF !important;
    box-shadow: 0 6px 14px -2px rgba(37, 99, 235, 0.35);
}

.category-10ms-card .card-icon-wrap {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    background: var(--color-primary-light);
    color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 0.4rem;
    transition: all 0.2s ease;
}

.category-10ms-card:hover .card-icon-wrap {
    transform: scale(1.08);
}

.category-10ms-card.active .card-icon-wrap {
    background: rgba(255, 255, 255, 0.22);
    color: #FFFFFF;
}

.category-10ms-card .card-title {
    font-size: 0.725rem;
    font-weight: 700;
    line-height: 1.25;
    color: inherit;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
    word-break: break-word;
    height: 2.5em;
    display: flex;
    align-items: center;
    justify-content: center;
}

.category-10ms-card .card-badge {
    position: absolute;
    top: 4px;
    right: 4px;
    font-size: 0.65rem;
    padding: 0.1rem 0.35rem;
    border-radius: 9999px;
    background: rgba(0, 0, 0, 0.06);
    color: inherit;
    font-weight: 600;
}

.category-10ms-card.active .card-badge {
    background: rgba(255, 255, 255, 0.25);
    color: #FFFFFF;
}

/* Category Section Header */
.catalog-section {
    padding: 2.5rem 0 1.5rem;
    border-bottom: 1px solid var(--color-border);
}

.catalog-section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.catalog-section-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--color-text);
    margin: 0;
}

.catalog-section-title .section-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: var(--radius);
    background: var(--color-primary-light);
    color: var(--color-primary);
    font-size: 1.25rem;
}

.catalog-view-all-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-primary);
    text-decoration: none;
    padding: 0.35rem 0.75rem;
    border-radius: var(--radius);
    transition: all 0.2s ease;
}

.catalog-view-all-btn:hover {
    background: var(--color-primary-light);
}

/* Minimal Clean Course Card (4-column Grid) */
.catalog-grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.25rem;
}

@media (max-width: 1024px) {
    .catalog-grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .catalog-grid-4 {
        grid-template-columns: 1fr;
    }
}

.minimal-course-card {
    display: flex;
    flex-direction: column;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: all 0.25s ease;
    text-decoration: none;
    color: var(--color-text);
    height: 100%;
    box-shadow: var(--shadow-sm);
}

.minimal-course-card:hover {
    border-color: var(--color-primary);
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
    transform: translateY(-3px);
}

.minimal-card-thumb {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    background-color: #0F172A;
    overflow: hidden;
}

.minimal-card-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.35s ease;
}

.minimal-course-card:hover .minimal-card-thumb img {
    transform: scale(1.04);
}

.minimal-card-badge {
    position: absolute;
    top: 8px;
    left: 8px;
    display: flex;
    gap: 0.3rem;
    flex-wrap: wrap;
    z-index: 2;
}

.minimal-card-body {
    padding: 1rem 1.15rem 1.15rem;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.minimal-card-title {
    font-size: 0.95rem;
    font-weight: 700;
    line-height: 1.4;
    color: var(--color-text);
    margin: 0 0 0.5rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    min-height: 2.8em;
}

.minimal-card-instructor {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-bottom: 0.65rem;
}

.minimal-card-instructor img {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    object-fit: cover;
}

.minimal-card-meta {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-bottom: 0.85rem;
    padding-bottom: 0.65rem;
    border-bottom: 1px dashed var(--color-border);
}

.minimal-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: auto;
    padding-top: 0.25rem;
}

.minimal-price-main {
    font-size: 1.15rem;
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1;
}

.minimal-price-original {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-decoration: line-through;
    margin-left: 0.35rem;
}

.minimal-card-btn {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.35rem 0.75rem;
    border-radius: var(--radius-sm);
    background: var(--color-primary-light);
    color: var(--color-primary);
    border: none;
    transition: all 0.2s ease;
}

.minimal-course-card:hover .minimal-card-btn {
    background: var(--color-primary);
    color: #FFFFFF;
}

/* Book / E-Book Resource Cards */
.book-card-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

@media (max-width: 900px) {
    .book-card-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.book-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    transition: all 0.25s ease;
    text-decoration: none;
    box-shadow: var(--shadow-sm);
}

.book-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.book-cover-mockup {
    width: 130px;
    height: 180px;
    border-radius: 4px 8px 8px 4px;
    box-shadow: 4px 6px 15px rgba(0, 0, 0, 0.15), inset -2px 0 6px rgba(0, 0, 0, 0.2);
    margin-bottom: 1rem;
    object-fit: cover;
    background: #1E293B;
}

.book-card-title {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 0.25rem;
    line-height: 1.3;
}

.book-card-author {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-bottom: 0.75rem;
}

/* Instructor Spotlight */
.instructor-spotlight-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.25rem;
}

@media (max-width: 900px) {
    .instructor-spotlight-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.instructor-spotlight-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1.5rem 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    transition: all 0.2s ease;
}

.instructor-spotlight-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.instructor-spotlight-avatar {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 0.75rem;
    border: 3px solid var(--color-primary-light);
}

/* Partner Trust Logos */
.partner-logos-strip {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2.5rem;
    flex-wrap: wrap;
    padding: 1.5rem 0;
    opacity: 0.75;
}

.partner-logo-item {
    font-weight: 800;
    font-size: 1.25rem;
    letter-spacing: -0.02em;
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

/* ==========================================
   Header User Profile Dropdown
   ========================================== */
.user-dropdown-wrapper {
    position: relative;
    display: inline-block;
}

.user-dropdown-btn {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    padding: 0.35rem 0.75rem 0.35rem 0.4rem;
    background: var(--color-surface);
    border: 1.5px solid var(--color-border);
    border-radius: 9999px;
    color: var(--color-text);
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: inherit;
}

.user-dropdown-btn:hover,
.user-dropdown-btn.active {
    background: var(--color-surface-hover);
    border-color: var(--color-primary);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.user-dropdown-avatar {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    object-fit: cover;
}

.user-dropdown-meta {
    display: flex;
    flex-direction: column;
    text-align: left;
    line-height: 1.15;
}

.user-dropdown-name {
    font-size: 0.825rem;
    font-weight: 700;
    max-width: 110px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-dropdown-role {
    font-size: 0.68rem;
    color: var(--color-primary);
    font-weight: 600;
}

.user-dropdown-chevron {
    color: var(--color-text-muted);
    transition: transform 0.2s ease;
}

.user-dropdown-btn.active .user-dropdown-chevron {
    transform: rotate(180deg);
}

.user-dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    width: 230px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 14px;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.12);
    padding: 0.5rem;
    display: none;
    flex-direction: column;
    z-index: 1000;
    animation: dropdownFadeIn 0.15s ease-out forwards;
}

.user-dropdown-menu.show {
    display: flex;
}

@keyframes dropdownFadeIn {
    from {
        opacity: 0;
        transform: translateY(-6px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.user-dropdown-header {
    padding: 0.6rem 0.75rem;
    background: var(--color-surface-hover);
    border-radius: 10px;
    margin-bottom: 0.35rem;
}

.user-dropdown-item {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    padding: 0.55rem 0.75rem;
    color: var(--color-text);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: 8px;
    transition: all 0.15s ease;
}

.user-dropdown-item:hover {
    background: var(--color-surface-hover);
    color: var(--color-primary);
}

.user-dropdown-item.text-danger:hover {
    background: #FEE2E2;
    color: #DC2626;
}

.user-dropdown-divider {
    height: 1px;
    background: var(--color-border);
    margin: 0.35rem 0;
}

/* ==========================================
   Sliding Auth Tab Switcher
   ========================================== */
.auth-tab-slider {
    display: flex;
    background: var(--color-surface-hover);
    padding: 4px;
    border-radius: 9999px;
    border: 1px solid var(--color-border);
    margin-bottom: 1.75rem;
    position: relative;
}

.auth-tab-btn {
    flex: 1;
    text-align: center;
    padding: 0.6rem 1rem;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--color-text-muted);
    border: none;
    background: transparent;
    border-radius: 9999px;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    font-family: inherit;
    text-decoration: none;
    display: inline-block;
}

.auth-tab-btn.active {
    background: var(--color-surface);
    color: var(--color-primary);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

/* ==========================================================================
   Standalone Home Course Category Section (5 Cols Desktop, 3 Cols Mobile)
   ========================================================================== */
.home-categories-section {
    padding: 3.5rem 0;
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
}

.home-categories-header {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    margin-bottom: 1.75rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.home-category-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 1rem;
    width: 100%;
}

.home-category-card {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    height: 74px;
    min-height: 74px;
    max-height: 74px;
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--color-bg);
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--color-text);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.02);
    transition: all 0.22s cubic-bezier(0.4, 0, 0.2, 1);
    box-sizing: border-box;
    overflow: hidden;
}

.home-category-card:hover {
    transform: translateY(-2px);
    border-color: var(--color-primary);
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.07);
    background: var(--color-surface);
}

.home-category-icon {
    width: 44px;
    height: 44px;
    min-width: 44px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
    transition: transform 0.2s ease;
}

.home-category-card:hover .home-category-icon {
    transform: scale(1.08);
}

.home-category-info {
    flex: 1;
    min-width: 0;
    display: flex;
    align-items: center;
}

.home-category-title {
    font-size: 0.9rem;
    font-weight: 700;
    line-height: 1.25;
    color: var(--color-text);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    word-break: break-word;
    text-align: left;
}

@media (max-width: 1080px) {
    .home-category-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 0.85rem;
    }
}

@media (max-width: 850px) {
    .home-category-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 0.65rem;
    }
}

@media (max-width: 640px) {
    .home-categories-section {
        padding: 2.25rem 0;
    }

    .home-category-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 0.45rem;
    }

    .home-category-card {
        height: 64px;
        min-height: 64px;
        max-height: 64px;
        padding: 0.4rem 0.45rem;
        gap: 0.4rem;
    }

    .home-category-icon {
        width: 32px;
        height: 32px;
        min-width: 32px;
        border-radius: 8px;
    }

    .home-category-icon svg {
        width: 17px;
        height: 17px;
    }

    .home-category-title {
        font-size: 0.72rem;
        line-height: 1.15;
        font-weight: 700;
    }
}

/* ==========================================================================
   Featured Course Section (Modern Screenshot Style + Mobile Horizontal Scroll)
   ========================================================================== */
.home-featured-section {
    padding: 4.5rem 0;
    background-color: var(--color-bg);
    border-top: 1px solid var(--color-border);
}

.home-featured-header {
    text-align: center;
    max-width: 650px;
    margin: 0 auto 3rem;
}

.home-featured-title {
    font-size: clamp(1.85rem, 4vw, 2.5rem);
    font-weight: 800;
    color: var(--color-text);
    margin-bottom: 0.5rem;
    line-height: 1.2;
}

.home-featured-subtitle {
    font-size: clamp(0.9rem, 2vw, 1.05rem);
    color: var(--color-text-muted);
    line-height: 1.5;
    margin: 0;
}

.home-featured-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.home-featured-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 18px;
    padding: 12px;
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: var(--color-text);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.home-featured-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-primary);
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.08);
}

.home-featured-thumb {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    aspect-ratio: 16 / 9;
    width: 100%;
    background-color: #0F172A;
}

.home-featured-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.3s ease;
}

.home-featured-card:hover .home-featured-thumb img {
    transform: scale(1.03);
}

.home-featured-body {
    padding: 0.85rem 0.35rem 0.25rem;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.home-featured-course-title {
    font-size: 1.05rem;
    font-weight: 700;
    line-height: 1.4;
    color: var(--color-text);
    margin-bottom: 0.4rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    transition: color 0.2s ease;
}

.home-featured-card:hover .home-featured-course-title {
    color: var(--color-primary);
}

.home-featured-course-desc {
    font-size: 0.825rem;
    color: var(--color-text-muted);
    line-height: 1.5;
    margin-bottom: 0.85rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.home-featured-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: auto;
    padding-top: 0.75rem;
    border-top: 1px solid var(--color-border);
    gap: 0.5rem;
}

.home-featured-price {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--color-primary);
}

.home-featured-btn {
    border-radius: 9999px;
    padding: 0.45rem 0.95rem;
    font-size: 0.8rem;
    font-weight: 600;
    white-space: nowrap;
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    line-height: 1.2;
    text-decoration: none;
}

.home-featured-action {
    text-align: center;
    margin-top: 3.75rem;
    padding-top: 0.75rem;
}

/* Tablet Responsive: 2 Columns for spacious cards & wide buttons */
@media (min-width: 769px) and (max-width: 1100px) {
    .home-featured-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.25rem;
    }
}

/* Mobile Responsive: Horizontal Scrollable (1.5 cards in view) */
@media (max-width: 768px) {
    .home-featured-section {
        padding: 3rem 0;
    }

    .home-featured-header {
        margin-bottom: 2rem;
    }

    .home-featured-grid {
        display: flex;
        overflow-x: auto;
        scroll-snap-type: x mandatory;
        -webkit-overflow-scrolling: touch;
        gap: 0.85rem;
        padding: 0.25rem 1rem 1.25rem;
        margin: 0 -1rem;
        scrollbar-width: none;
    }

    .home-featured-grid::-webkit-scrollbar {
        display: none;
    }

    .home-featured-card {
        flex: 0 0 68%;
        max-width: 68%;
        min-width: 240px;
        scroll-snap-align: start;
        border-radius: 16px;
        padding: 10px;
    }

    .home-featured-thumb {
        border-radius: 10px;
    }

    .home-featured-course-title {
        font-size: 0.95rem;
    }

    .home-featured-course-desc {
        font-size: 0.78rem;
    }

    .home-featured-action {
        margin-top: 1.5rem;
        padding-top: 0;
    }
}

    /* ==========================================================================
   Universal Clean Pagination (No Giant SVGs / 10MS Aesthetic)
   ========================================================================== */
.custom-pagination-nav {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    margin: 2.5rem 0 1.5rem;
}

.custom-pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    list-style: none;
    padding: 0;
    margin: 0;
    flex-wrap: wrap;
}

.custom-pagination .page-item {
    display: inline-block;
    list-style: none;
}

.custom-pagination .page-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0 0.6rem;
    border-radius: 8px;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--color-text, #0F172A);
    background-color: var(--color-surface, #ffffff);
    border: 1px solid var(--color-border, #E2E8F0);
    text-decoration: none;
    transition: all 0.15s ease;
    user-select: none;
    box-sizing: border-box;
}

.custom-pagination .page-link:hover {
    background-color: var(--color-bg, #F1F5F9);
    border-color: #CBD5E1;
    color: var(--color-primary, #2563EB);
}

.custom-pagination .page-item.active .page-link {
    background-color: var(--color-primary, #2563EB);
    color: #ffffff;
    border-color: var(--color-primary, #2563EB);
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
}

.custom-pagination .page-item.disabled .page-link {
    opacity: 0.35;
    cursor: not-allowed;
    background-color: transparent;
    pointer-events: none;
}

/* Fix any stray default pagination SVGs */
nav svg {
    max-width: 20px !important;
    max-height: 20px !important;
}