:root {
    /* --- Light Mode (Default) Premium --- */
    --bg-main: #f8fafc;
    --bg-paper: #ffffff;
    --bg-glass: rgba(255, 255, 255, 0.85); /* For glassmorphism */
    --bg-card: #ffffff;
    --bg-paper-hover: #f1f5f9;
    --bg-dark: #f8fafc;
    --bg-lighter: #ffffff;

    --primary: #4f46e5; /* Vibrant Indigo */
    --primary-hover: #4338ca;
    --accent: #0ea5e9; /* Sky Blue */

    --secondary: #e2e8f0;

    --text-primary: #0f172a;
    --text-main: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;

    --border-color: rgba(15, 23, 42, 0.1);
    --border: rgba(15, 23, 42, 0.1);

    --success: #10b981;
    --error: #ef4444;

    --gradient-main: linear-gradient(135deg, #4f46e5 0%, #0ea5e9 100%);

    --font-main: 'Outfit', sans-serif;

    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
}

/* --- Dark Mode Override Premium --- */
[data-theme="dark"] {
    --bg-main: #09090b;
    --bg-paper: #18181b;
    --bg-glass: rgba(24, 24, 27, 0.75); /* For glassmorphism */
    --bg-card: #18181b;
    --bg-paper-hover: rgba(39, 39, 42, 0.8);
    --bg-dark: #09090b;
    --bg-lighter: #27272a;

    --secondary: rgba(63, 63, 70, 0.5);

    --text-primary: #f8fafc;
    --text-main: #f8fafc;
    --text-secondary: #a1a1aa;
    --text-muted: #a1a1aa;

    --border-color: rgba(255, 255, 255, 0.1);
    --border: rgba(255, 255, 255, 0.1);
}

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

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-main);
    line-height: 1.6;
    overflow-x: hidden;
    max-width: 100vw;
}

a {
    text-decoration: none;
    color: inherit;
    transition: 0.3s ease;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

/* Utilities */
.app-container {
    max-width: 100%;
    width: 100%;
    overflow-x: hidden;
    margin: 0 auto;
    padding: 0;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    border-radius: 50px;
    font-weight: 500;
    font-size: 0.95rem;
    cursor: pointer;
    border: none;
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background: var(--gradient-main);
    color: white;
    box-shadow: 0 4px 15px rgba(109, 40, 217, 0.4);
}

.btn-primary:hover {
    box-shadow: 0 6px 20px rgba(109, 40, 217, 0.6);
}

.btn-secondary {
    background: #2d2d2d;
    color: white;
}

.btn-secondary:hover {
    background: #1a1a1a;
}

.btn-lg {
    padding: 14px 32px;
    font-size: 1.1rem;
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1.2rem;
    cursor: pointer;
    position: relative;
    padding: 8px;
    border-radius: 50%;
    transition: background 0.3s;
}

.icon-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.text-gradient {
    background: var(--gradient-main);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.accent {
    color: var(--accent);
}

/* Announcement Bar */
.announcement-bar {
    display: flex;
    justify-content: center;
    align-items: center;
    background: var(--gradient-main);
    padding: 10px 40px 10px 16px;
    position: relative;
    z-index: 101;
    width: 100vw;
    margin-left: calc(-50vw + 50%);
    margin-right: calc(-50vw + 50%);
}

.announcement-text {
    font-size: 0.9rem;
    font-weight: 600;
    color: white;
    text-align: center;
}

.announcement-close {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    color: white;
    font-size: 1rem;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    transition: background 0.2s;
}

.announcement-close:hover {
    background: rgba(255, 255, 255, 0.2);
}

.announcement-bar.hidden {
    display: none;
}

/* Navbar - Mobile First */
.header-search-desktop,
.header-bottom {
    display: none;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    padding: 0;
}

.navbar {
    width: 100%;
    padding: 12px 0;
    display: flex;
    justify-content: center;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    background: var(--bg-glass);
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    max-width: 100%;
    padding: 0 16px;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 1;
    min-width: 0;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.nav-links {
    display: none;
}

/* Hamburger Button */
.hamburger-btn {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    transition: background 0.3s;
}

.hamburger-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.hamburger-line {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all 0.3s;
}

.hamburger-btn.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger-btn.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.hamburger-btn.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-logo-img {
    height: 36px;
    width: auto;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    white-space: nowrap;
}

/* Hide login button on very small screens for mobile */
@media (max-width: 480px) {
    .login-btn {
        display: none !important;
    }

    .logo-text {
        font-size: 1.3rem;
    }

    .nav-logo-img {
        height: 32px;
    }
}

/* Mobile Nav Overlay */
.mobile-nav-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 998;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.mobile-nav-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* Mobile Nav Slide-out Menu */
.mobile-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 300px;
    /* Fixed width looks better than vw usually, or keep vw */
    width: 75vw;
    min-width: 280px;
    max-width: 360px;
    height: 100vh;
    background: var(--bg-paper);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-right: 1px solid var(--border-color);
    z-index: 999;
    transform: translateX(-100%);
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    visibility: hidden;
    box-shadow: 10px 0 40px rgba(0, 0, 0, 0.5);
}

.mobile-nav.active {
    transform: translateX(0);
    visibility: visible;
}

/* Mobile Nav Header */
.mobile-nav-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
}

.close-nav-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-paper-hover);
    border: none;
    border-radius: 50%;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1.2rem;
    transition: all 0.3s;
}

.close-nav-btn:hover {
    background: var(--secondary);
    color: var(--text-primary);
}

/* Mobile Nav Account Section */
.mobile-nav-account {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
}

.mobile-account-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 14px 20px;
    background: var(--gradient-main);
    border-radius: 12px;
    color: white;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(109, 40, 217, 0.3);
}

.mobile-account-btn:hover {
    box-shadow: 0 6px 20px rgba(109, 40, 217, 0.5);
    transform: translateY(-2px);
}

.mobile-account-btn i {
    font-size: 1.1rem;
}

/* Mobile Nav Links */
.mobile-nav-links {
    padding: 24px 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.mobile-nav-link {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 1.05rem;
    border-radius: 12px;
    transition: all 0.2s ease;
    border: 1px solid transparent;
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
    background: var(--bg-paper-hover);
    color: var(--text-primary);
}

.mobile-nav-link i {
    width: 20px;
    text-align: center;
    font-size: 1rem;
    color: var(--accent);
}

/* Mobile Nav Dropdown */
.mobile-nav-dropdown {
    margin-top: 4px;
}

.mobile-dropdown-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 16px;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 1rem;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s;
}

.mobile-dropdown-header:hover {
    background: var(--bg-paper-hover);
    color: var(--text-primary);
}

.dropdown-label {
    display: flex;
    align-items: center;
    gap: 14px;
}

.dropdown-label i {
    width: 20px;
    text-align: center;
    color: var(--accent);
}

.dropdown-arrow {
    font-size: 0.75rem;
    transition: transform 0.3s;
}

.mobile-dropdown-header.active .dropdown-arrow {
    transform: rotate(180deg);
}

.mobile-dropdown-content {
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: 8px 12px;
    background: var(--bg-paper-hover);
    border-radius: 12px;
    margin-top: 8px;
    border: 1px solid var(--border-color);
}

.mobile-dropdown-content.show {
    display: flex;
}

.mobile-sublink {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: var(--text-secondary);
    font-size: 0.95rem;
    border-radius: 8px;
    transition: all 0.2s;
}

.mobile-sublink:hover {
    background: rgba(109, 40, 217, 0.15);
    color: var(--text-primary);
}

.mobile-sublink i {
    width: 18px;
    text-align: center;
    color: var(--accent);
    font-size: 0.9rem;
}

/* Cart Button */
.cart-btn {
    position: relative;
}

.cart-count {
    position: absolute;
    top: 0;
    right: 0;
    background: var(--primary);
    color: white;
    font-size: 0.65rem;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid var(--bg-main);
    font-weight: 600;
}

/* Search Overlay */
.search-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 70px;
    background: var(--bg-main);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    border-bottom: 1px solid var(--border-color);
    transform: translateY(-100%);
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.search-overlay.active {
    transform: translateY(0);
}

.search-container {
    width: 100%;
    max-width: 1200px;
    padding: 0 16px;
    display: flex;
    align-items: center;
    gap: 16px;
}

#searchInput {
    flex: 1;
    background: transparent;
    border: none;
    font-size: 1.1rem;
    color: var(--text-primary);
    padding: 10px 0;
    font-family: 'Outfit', sans-serif;
    outline: none;
}

#searchInput::placeholder {
    color: var(--text-secondary);
}

.close-search {
    font-size: 1.2rem;
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.05);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.close-search:hover {
    color: var(--primary);
    background: rgba(255, 255, 255, 0.1);
}

/* Hero Section */
.hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    max-width: 100%;
    margin: 40px auto 100px;
    padding: 0 32px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(109, 40, 217, 0.15);
    color: var(--accent);
    padding: 6px 16px;
    border-radius: 100px;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 24px;
    border: 1px solid rgba(139, 92, 246, 0.3);
}

.hero-title {
    font-size: 4rem;
    line-height: 1.1;
    font-weight: 800;
    margin-bottom: 24px;
    letter-spacing: -1px;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    max-width: 500px;
}

.hero-cta {
    display: flex;
    gap: 16px;
    margin-bottom: 60px;
}

.hero-stat-row {
    display: flex;
    align-items: center;
    gap: 30px;
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-num {
    font-size: 1.8rem;
    font-weight: 700;
}

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

.stat-divider {
    width: 1px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
}

/* Code Visual */
.hero-visual {
    position: relative;
    display: flex;
    justify-content: center;
}

.code-card {
    background: #1e1e24;
    border-radius: var(--radius-lg);
    padding: 24px;
    width: 100%;
    max-width: 500px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.05);
    position: relative;
    z-index: 2;
    transform: perspective(1000px) rotateY(-5deg) rotateX(5deg);
    transition: transform 0.5s ease;
}

.code-card:hover {
    transform: perspective(1000px) rotateY(0) rotateX(0);
}

.code-header {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.red {
    background: #ef4444;
}

.yellow {
    background: #eab308;
}

.green {
    background: #22c55e;
}

.code-body pre {
    font-family: 'Fira Code', monospace;
    font-size: 0.95rem;
    color: #cbd5e1;
    line-height: 1.5;
}

/* Syntax Highlighting Mock */
.k {
    color: #d946ef;
}

/* keyword */
.c {
    color: #fbbf24;
}

/* class */
.t {
    color: #60a5fa;
}

/* this */
.p {
    color: #94a3b8;
}

/* property */
.s {
    color: #22c55e;
}

/* string */
.v {
    color: #f472b6;
}

/* value */
.m {
    color: #60a5fa;
}

/* method */

.visual-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 120%;
    height: 120%;
    background: radial-gradient(circle, rgba(109, 40, 217, 0.4) 0%, rgba(0, 0, 0, 0) 70%);
    z-index: 1;
    pointer-events: none;
}

/* Feature/Courses Section */
.courses-section {
    max-width: 1200px;
    margin: 0 auto 100px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
}

.filter-tabs {
    display: flex;
    gap: 8px;
    background: var(--bg-paper);
    padding: 6px;
    border-radius: 50px;
    border: 1px solid var(--border-color);
}

.tab {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 8px 16px;
    border-radius: 40px;
    cursor: pointer;
    font-weight: 500;
    transition: 0.3s;
}

.tab.active,
.tab:hover {
    background: var(--secondary);
    color: var(--text-primary);
}

/* Section Controls */
.section-controls {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* Column Toggle Buttons */
.column-toggle {
    display: flex;
    align-items: center;
    gap: 4px;
    background: var(--bg-paper);
    padding: 4px;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.col-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.2s;
}

.col-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.col-btn.active {
    background: var(--primary);
    color: white;
}

/* Course Grid */
.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

/* List View - 1 column */
.course-grid.cols-list {
    grid-template-columns: 1fr;
    max-width: 800px;
    margin: 0 auto;
}

/* Grid View */
.course-grid.cols-grid {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

@media (max-width: 600px) {
    .course-grid,
    .course-grid.cols-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
        gap: 16px;
    }
    
    .course-grid.cols-list {
        grid-template-columns: 1fr;
    }

    .column-toggle {
        display: none; /* Auto-fill handles grid gracefully on mobile */
    }
}

.course-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    padding: 16px;
    display: flex;
    flex-direction: column;
}

.course-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-glass);
    border-color: var(--accent);
}

.course-thumb {
    height: 200px;
    background: #27272a;
    position: relative;
    overflow: hidden;
    border-radius: calc(var(--radius-md) - 4px);
    margin-bottom: 16px;
}

.course-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.7s cubic-bezier(0.165, 0.84, 0.44, 1);
}

.course-card:hover .course-thumb img {
    transform: scale(1.1);
}

.tag-badge {
    position: absolute;
    top: 12px;
    left: 12px;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    padding: 6px 14px;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    color: white;
    text-transform: uppercase;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.1);
    letter-spacing: 0.5px;
    transform: translateY(0);
    transition: transform 0.3s ease, background 0.3s ease;
}

.course-card:hover .tag-badge {
    transform: translateY(-2px);
    background: rgba(109, 40, 217, 0.8);
}

.course-info {
    padding: 20px 8px 8px 8px;
    /* Reduced side padding since card has padding */
}

.rating-row {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    color: #eab308;
    margin-bottom: 12px;
}

.rating-count {
    color: var(--text-secondary);
}

.course-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 12px;
    line-height: 1.4;
}

.instructor-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
}

.instructor-avatar {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: #3f3f46;
}

.instructor-name {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 16px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.price {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
}

.add-btn {
    background: rgba(255, 255, 255, 0.1);
    border: none;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    cursor: pointer;
    transition: 0.3s;
}

.add-btn:hover {
    background: var(--primary);
}

/* Footer */
.footer {
    border-top: 1px solid var(--border-color);
    padding: 80px 0 30px;
    margin-top: 40px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto 60px;
    padding: 0 20px;
    flex-wrap: wrap;
    gap: 40px;
}

.footer-brand p {
    color: var(--text-secondary);
    margin-top: 12px;
    max-width: 250px;
}

.footer-links {
    display: flex;
    gap: 60px;
}

.link-col h4 {
    margin-bottom: 20px;
    font-size: 1.1rem;
}

.link-col {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.link-col a {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

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

.footer-bottom {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

/* ... Previous styles ... */

/* New Visual Helpers */
.loading {
    padding: 100px;
    text-align: center;
    font-size: 2rem;
    color: var(--text-secondary);
}

.toast {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: var(--accent);
    color: white;
    padding: 12px 24px;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    opacity: 0;
    transform: translateY(20px);
    transition: 0.3s;
    z-index: 1000;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

/* Time Widget */
.time-widget {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.05);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Page Layouts */
.product-layout {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 40px;
    margin-top: 40px;
    margin-bottom: 80px;
}

.p-title {
    font-size: 3rem;
    line-height: 1.1;
    margin: 16px 0;
}

.p-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.badge {
    padding: 4px 12px;
    border-radius: 4px;
    text-transform: uppercase;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.badge.languages {
    background: #3b82f6;
    color: white;
}

.badge.learn {
    background: #10b981;
    color: white;
}

.p-meta {
    display: flex;
    gap: 20px;
    margin-bottom: 30px;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.p-hero-img {
    width: 100%;
    border-radius: var(--radius-md);
    margin-bottom: 40px;
    max-height: 400px;
    object-fit: cover;
}

.text-warning {
    color: #eab308;
}

.learn-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    background: var(--bg-paper);
    padding: 30px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.learn-list li {
    display: flex;
    gap: 10px;
    align-items: flex-start;
}

.learn-list i {
    color: var(--accent);
    margin-top: 5px;
}

/* Product Sidebar */
.buy-card {
    background: var(--bg-paper);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 24px;
    position: sticky;
    top: 100px;
}

.buy-thumb {
    width: 100%;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
    /* Hide if hero is present? No, keep as sidebar thumbnail */
    display: none;
}

@media(min-width: 900px) {
    .buy-thumb {
        display: block;
    }

    /* --- Desktop Header (Two Rows) --- */
    .navbar {
        padding: 0;
        /* Removing padding from container to let rows handle it */
    }

    .nav-container {
        flex-direction: column;
        /* Stack top and bottom rows */
        padding: 0;
        max-width: 100%;
        display: block;
        /* Use block to separate rows easily */
    }

    /* Top Row: Logo - Search - Actions */
    .header-top {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 16px 40px;
        border-bottom: 1px solid var(--border-color);
        background: transparent;
    }

    /* Search Bar (Desktop) */
    .header-search-desktop {
        flex: 1;
        max-width: 500px;
        margin: 0 40px;
        position: relative;
        display: block !important;
        /* Visible on desktop */
    }

    .search-form {
        display: flex;
        align-items: center;
        background: var(--bg-paper-hover);
        /* Theme aware input bg */
        border: 1px solid var(--border-color);
        border-radius: 50px;
        padding: 6px 16px;
        transition: all 0.3s ease;
    }

    .search-form:focus-within {
        background: rgba(255, 255, 255, 0.12);
        border-color: var(--primary);
        box-shadow: 0 0 0 2px rgba(109, 40, 217, 0.2);
    }

    .search-form input {
        background: transparent;
        border: none;
        color: var(--text-primary);
        width: 100%;
        padding: 8px;
        font-size: 0.95rem;
        outline: none;
    }

    .search-form button {
        background: transparent;
        border: none;
        color: var(--text-secondary);
        cursor: pointer;
        padding: 8px;
        font-size: 1.1rem;
        transition: color 0.3s;
    }

    .search-form button:hover {
        color: var(--primary);
    }

    /* Bottom Row: Navigation */
    .header-bottom {
        background: transparent;
        padding: 12px 40px;
        display: flex;
        /* Visible on desktop */
        justify-content: flex-start;
        /* Left align nav links */
        border-bottom: none;
    }

    /* Desktop Navigation */
    .hamburger-btn {
        display: none;
    }

    .nav-links {
        display: flex;
        align-items: center;
        gap: 32px;
        position: static;
        background: transparent;
        padding: 0;
        width: auto;
        /* Reset any previous styles */
        flex-direction: row;
        background: none;
    }

    .nav-link {
        color: var(--text-secondary);
        text-decoration: none;
        font-weight: 500;
        font-size: 0.95rem;
        transition: color 0.3s;
        display: flex;
        align-items: center;
        gap: 6px;
    }

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

    .nav-dropdown {
        position: relative;
    }

    .dropdown-trigger i {
        font-size: 0.8rem;
        transition: transform 0.3s;
    }

    .nav-dropdown:hover .dropdown-trigger i {
        transform: rotate(180deg);
        color: var(--primary);
    }

    .dropdown-menu {
        position: absolute;
        top: 100%;
        left: 50%;
        transform: translateX(-50%) translateY(10px);
        background: var(--bg-paper);
        backdrop-filter: blur(12px);
        border: 1px solid var(--border-color);
        border-radius: 12px;
        padding: 8px;
        min-width: 200px;
        display: flex;
        flex-direction: column;
        gap: 4px;
        opacity: 0;
        visibility: hidden;
        transition: all 0.2s ease;
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    }

    .nav-dropdown:hover .dropdown-menu {
        opacity: 1;
        visibility: visible;
        transform: translateX(-50%) translateY(0);
    }

    .dropdown-item {
        display: flex;
        align-items: center;
        gap: 12px;
        padding: 10px 16px;
        color: var(--text-secondary);
        text-decoration: none;
        font-size: 0.9rem;
        border-radius: 8px;
        transition: all 0.2s;
        white-space: nowrap;
    }

    .dropdown-item:hover {
        background: var(--bg-paper-hover);
        color: var(--text-primary);
    }

    .dropdown-item i {
        color: var(--accent);
        width: 16px;
        text-align: center;
    }

    /* Hide mobile search trigger icon on desktop since we have the bar */
    .search-btn-trigger {
        display: none;
    }
}

.buy-price {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.btn-block {
    width: 100%;
    justify-content: center;
    margin-bottom: 12px;
}

.money-back {
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.course-features li {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.course-features li i {
    width: 20px;
    text-align: center;
}

/* Extra Page */
.extra-header {
    text-align: center;
    margin: 40px 0 60px;
}

.extra-header h1 {
    font-size: 3.5rem;
    margin-bottom: 10px;
}

.extra-section {
    margin-bottom: 80px;
}

.extra-section h2 {
    font-size: 2rem;
    margin-bottom: 30px;
    display: flex;
    align-items: center;
    gap: 12px;
}

/* Memes */
.meme-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.meme-card {
    background: var(--bg-paper);
    padding: 16px;
    border-radius: var(--radius-md);
    text-align: center;
}

.meme-card img {
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
    width: 100%;
    height: 250px;
    object-fit: cover;
}

/* Quotes */
.quote-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.quote-card {
    background: linear-gradient(135deg, #1e1e24 0%, #18181b 100%);
    padding: 30px;
    border-radius: var(--radius-md);
    border-left: 4px solid var(--accent);
}

.quote-card blockquote {
    font-size: 1.2rem;
    font-style: italic;
    margin-bottom: 16px;
    color: #e2e8f0;
}

.quote-card cite {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* History */
.history-list {
    border-left: 2px solid var(--border-color);
    margin-left: 20px;
    padding-left: 40px;
}

.history-item {
    position: relative;
    margin-bottom: 40px;
}

.history-item::before {
    content: '';
    position: absolute;
    left: -49px;
    /* adjust for border and padding */
    top: 5px;
    width: 16px;
    height: 16px;
    background: var(--accent);
    border: 4px solid var(--bg-main);
    border-radius: 50%;
}

.year {
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 5px;
}

/* Responsive Fixes */
@media (max-width: 900px) {
    .product-layout {
        grid-template-columns: 1fr;
    }

    .buy-card {
        position: static;
        margin-top: 40px;
    }
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .navbar {
        padding: 16px 0;
        margin-bottom: 2rem;
    }

    .nav-container {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        gap: 8px;
    }

    .nav-links {
        width: 100%;
        max-width: 95vw;
        justify-content: center;
        padding: 12px 24px;
        gap: 20px;
        flex-wrap: wrap;
        font-size: 0.95rem;
        background: rgba(255, 255, 255, 0.05);
        border-radius: 50px;
    }

    .nav-actions {
        width: auto;
        justify-content: center;
        gap: 12px;
    }

    .login-btn {
        display: none;
        /* Hide login btn on mobile header to save space, maybe move to menu? Or keep icon only? detailed below */
    }

    .mobile-menu-btn {
        display: block;
        /* SHOW THE BUTTON */
        font-size: 1.5rem;
        width: 44px;
        /* Touch target */
        height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
        border-radius: 50%;
        background: rgba(255, 255, 255, 0.05);
        color: var(--text-primary);
    }

    .nav-actions {
        gap: 8px;
    }

    .cart-btn,
    .search-btn {
        width: 44px;
        height: 44px;
        font-size: 1.2rem;
        display: flex;
        /* Center icons */
        align-items: center;
        justify-content: center;
    }

    /* Hero */
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
        margin: 20px auto 60px;
        gap: 30px;
        padding: 0 16px;
        max-width: 100%;
        align-items: center;
        justify-items: center;
    }

    .hero-content {
        display: flex;
        flex-direction: column;
        align-items: center;
        width: 100%;
        margin: 0 auto;
    }

    .hero-badge {
        margin: 0 auto 24px;
    }

    .hero-title {
        font-size: 2rem;
        line-height: 1.2;
        word-wrap: break-word;
        text-align: center;
        width: 100%;
    }

    .hero-subtitle {
        font-size: 1rem;
        margin: 0 auto 30px;
        padding: 0 10px;
        text-align: center;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
        width: 100%;
        gap: 12px;
        margin: 0 auto;
    }

    .hero-cta .btn {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }

    .hero-stat-row {
        justify-content: center;
        width: 100%;
        margin: 0 auto;
    }

    .code-card {
        transform: none !important;
        max-width: 100%;
        width: 100%;
        padding: 16px;
        font-size: 0.85rem;
        margin: 0 auto;
    }

    .code-card pre {
        font-size: 0.75rem;
        overflow-x: auto;
        text-align: left;
    }

    .hero-visual {
        width: 100%;
        padding: 0 16px;
        display: flex;
        justify-content: center;
    }

    .visual-glow {
        display: none;
    }

    /* Filters */
    .section-header {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }

    /* Footer */
    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: 40px;
    }

    .footer-links {
        flex-direction: column;
        gap: 30px;
        width: 100%;
    }

    .footer-brand p {
        margin: 12px auto 0;
    }

    /* Extra Page Mobile */
    .extra-header h1 {
        font-size: 2.5rem;
    }

    .history-list {
        margin-left: 10px;
        padding-left: 30px;
    }

    /* Global Mobile Alignment & Spacing */
    body {
        text-align: center;
        /* Center align everything on mobile by default */
    }

    .app-container {
        padding: 0 16px;
        /* Adjust padding */
    }

    h1 {
        font-size: 2.2rem !important;
        /* Cap H1 size */
    }

    h2 {
        font-size: 1.8rem !important;
    }

    p {
        font-size: 1rem !important;
        line-height: 1.6;
    }

    /* Fix image sizing logic */
    img {
        max-width: 100%;
        height: auto;
    }
}

/* Mobile Menu Button - Legacy (keeping for backwards compatibility) */
.mobile-menu-btn {
    display: none;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
    z-index: 1001;
}

/* Note: Main .mobile-nav styles are defined earlier in the file */

/* Mobile Buy Bar (Product Page) */
.mobile-buy-bar {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background: rgba(24, 24, 27, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 16px 24px;
    z-index: 1000;
    box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.5);
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
    from {
        transform: translateY(100%);
    }

    to {
        transform: translateY(0);
    }
}

.m-price-info {
    display: flex;
    flex-direction: column;
}

.m-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.m-price {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
}

.m-actions {
    display: flex;
    gap: 12px;
}

/* Mobile Cart Sticky Footer */
.mobile-cart-footer {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background: rgba(24, 24, 27, 0.95);
    backdrop-filter: blur(20px);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 16px 24px;
    z-index: 1000;
    align-items: center;
    justify-content: space-between;
}

@media (max-width: 900px) {
    .mobile-buy-bar {
        display: flex;
    }

    /* Ensure content doesn't get hidden behind bar */
    .product-layout {
        padding-bottom: 80px;
    }

    .cart-page {
        padding-bottom: 100px;
    }

    .mobile-cart-footer {
        display: flex;
    }

    /* Hide desktop Checkout button in summary if creating duplicate sticky one? 
       Actually better to keep both but sticky one is for convenience. */

    /* Account Page Mobile */
    .account-grid {
        grid-template-columns: 1fr;
    }

    .info-row {
        flex-direction: column;
        align-items: flex-start;
        text-align: left;
        gap: 6px;
    }

    .info-value {
        text-align: left;
        width: 100%;
    }
}

/* Note: .mobile-nav.active styles are defined earlier in the file */

.mobile-nav-link {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-secondary);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    padding-bottom: 16px;
}

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

.mobile-dropdown-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}

.mobile-dropdown-content {
    display: none;
    flex-direction: column;
    gap: 16px;
    padding: 16px 0 0 16px;
}

.mobile-dropdown-content.show {
    display: flex;
}

.mobile-sublink {
    font-size: 1.1rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.mobile-sublink i {
    color: var(--accent);
}

/* --- New Product Page Redesign (Screenshot Match) --- */

/* Fix parent to allow auto margins */
#productContent {
    /* display: grid fallback */
    width: 100%;
}

.product-layout-v2 {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 60px;
    /* Restore vertical margins & Auto horizontal */
    margin: 40px auto 80px;
    align-items: start;
    width: 100%;
    max-width: 1440px;
    padding: 0 40px;
}

@media (max-width: 1200px) {
    .product-layout-v2 {
        grid-template-columns: 1fr 340px;
        gap: 40px;
        padding: 0 24px;
    }
}

@media (max-width: 900px) {
    .product-layout-v2 {
        grid-template-columns: 1fr;
    }

    .sidebar-v2 {
        position: static;
        /* No sticky on mobile */
    }
}

/* Header Section (Title & Actions) */
.product-top-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 25px;
}

.product-title-group h1 {
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 8px;
    line-height: 1.2;
}

.product-rating-row {
    display: flex;
    align-items: center;
    gap: 15px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.product-rating-row .stars {
    color: #f59e0b;
    /* Amber 500 */
}

.product-actions-group {
    display: flex;
    gap: 20px;
}

.action-link {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    transition: color 0.2s;
    cursor: pointer;
}

.action-link:hover {
    color: var(--primary);
}

/* Left Column */
.product-main-content {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.course-hero-container {
    width: 100%;
    border-radius: 12px;
    overflow: hidden;
    position: relative;
    background: #1f2937;
}

.course-hero-img-v2 {
    width: 100%;
    height: auto;
    display: block;
    aspect-ratio: 16/9;
    object-fit: cover;
}

/* Tabs */
.course-tabs-nav {
    display: flex;
    gap: 30px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 20px;
}

.course-tab-btn {
    background: none;
    border: none;
    padding: 12px 4px;
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    position: relative;
}

.course-tab-btn.active {
    color: var(--primary);
    /* Blue */
    font-weight: 600;
}

.course-tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--primary);
}

/* About / Description */
.course-description-text {
    color: var(--text-main) !important;
    /* Gray 300 */
    line-height: 1.7;
    font-size: 0.95rem;
    margin-bottom: 40px;
}

/* Curriculum Accordion */
.course-curriculum-section h3 {
    font-size: 1.4rem;
    margin-bottom: 20px;
}

.accordion-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
    background: transparent;
}

.accordion-item {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    background: var(--bg-paper);
}

.accordion-header {
    padding: 16px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    background: rgba(255, 255, 255, 0.02);
    transition: background 0.2s;
}

.accordion-header:hover {
    background: rgba(255, 255, 255, 0.05);
}

.accordion-title {
    font-weight: 600;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-primary);
}

.accordion-title i {
    color: var(--primary);
}

.accordion-icon {
    font-size: 0.85rem;
    color: var(--text-secondary);
    transition: transform 0.3s;
}

.accordion-item.active .accordion-icon {
    transform: rotate(180deg);
}

.accordion-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease-out;
    border-top: 1px solid transparent;
    background: var(--bg-paper);
}

.accordion-body p {
    padding: 20px;
    margin: 0;
    line-height: 1.7;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.accordion-item.active .accordion-body {
    max-height: 500px;
    /* Large enough for most answers */
    overflow: visible;
    border-top-color: var(--border-color);
}

.lesson-row {
    padding: 12px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
    color: var(--text-secondary);
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}

.lesson-row:last-child {
    border-bottom: none;
}

.lesson-left {
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Sidebar Columns */
.sidebar-v2 {
    display: flex;
    flex-direction: column;
    gap: 24px;
    position: sticky;
    top: 100px;
}

.sidebar-card {
    background: var(--bg-paper);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

/* Action Card */
.start-learning-btn {
    width: 100%;
    background: #3b82f6;
    /* Royal Blue */
    color: white;
    padding: 12px;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    margin-bottom: 20px;
    transition: background 0.3s;
}

.start-learning-btn:hover {
    background: #2563eb;
}

.meta-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.meta-item i {
    width: 20px;
    text-align: center;
}

/* Profile Card */
.instructor-row {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-top: 10px;
}

.instructor-avatar-large {
    width: 48px;
    height: 48px;
    background: #3b82f6;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 600;
}

/* Lists */
.sidebar-list {
    list-style: disc;
    padding-left: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.sidebar-list li::marker {
    color: var(--text-secondary);
}

/* --- Theme Toggle Switch --- */
.theme-switch-wrapper {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 16px;
    margin-top: 10px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

[data-theme="dark"] .theme-switch-wrapper {
    border-color: rgba(255, 255, 255, 0.1);
}

:root:not([data-theme="dark"]) .theme-switch-wrapper {
    border-color: rgba(0, 0, 0, 0.1);
}

.theme-switch {
    display: inline-block;
    height: 24px;
    position: relative;
    width: 48px;
}

.theme-switch input {
    display: none;
}

.slider {
    background-color: #e5e7eb;
    /* Gray 200 */
    bottom: 0;
    cursor: pointer;
    left: 0;
    position: absolute;
    right: 0;
    top: 0;
    transition: .4s;
    border-radius: 34px;
}

[data-theme="dark"] .slider {
    background-color: #4b5563;
    /* Gray 600 */
}

.slider:before {
    background-color: #fff;
    bottom: 3px;
    content: "";
    height: 18px;
    left: 3px;
    position: absolute;
    transition: .4s;
    width: 18px;
    border-radius: 50%;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

input:checked+.slider {
    background-color: var(--primary);
}

input:checked+.slider:before {
    transform: translateX(24px);
}

.mode-label {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-primary);
}

/* Fix Sidebar Price Alignment (Left Row) */
.sidebar-card .m-price-info {
    display: flex !important;
    flex-direction: row !important;
    align-items: baseline !important;
    justify-content: flex-start !important;
    gap: 12px;
    margin-bottom: 20px;
}

/* Force Light Theme for Mobile Buy Bar */
.mobile-buy-bar {
    background: #ffffff !important;
    border-top: 1px solid #e5e7eb !important;
}

.mobile-buy-bar .m-price {
    color: #111827 !important;
    /* Dark Text */
}

.mobile-buy-bar .m-label {
    color: #6b7280 !important;
}

/* --- Visual Overhaul: Reference Match System --- */

/* General Section Styling */
.detail-section {
    margin-bottom: 50px;
    background: transparent;
    border: none;
    box-shadow: none;
}

.section-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.course-title-large {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 12px;
    line-height: 1.2;
}

/* Badges */
.badges-row {
    display: flex;
    gap: 10px;
}

/* --- Premium Hero Visual --- */
.float-anim {
    animation: floating 4s ease-in-out infinite;
}

@keyframes floating {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-15px); }
    100% { transform: translateY(0px); }
}
.badge-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border-radius: 20px;
    background: #f3f4f6;
    color: #4b5563;
    font-size: 0.85rem;
    font-weight: 500;
}

.badge-online {
    background: #eff6ff;
    color: #2563eb;
}

/* Feature Highlights (About Batch) */
.feature-highlights-box {
    background: transparent;
    border: none;
    box-shadow: none;
}

.feature-list-prominent {
    display: flex;
    flex-direction: column;
    gap: 20px;
    list-style: none;
    padding: 0;
}

.feature-list-prominent li {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.feat-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: #fef3c7;
    /* Amber/Yellowish like ref */
    color: #d97706;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    flex-shrink: 0;
}

.feat-info {
    display: flex;
    flex-direction: column;
    font-size: 0.95rem;
    color: var(--text-primary);
    line-height: 1.5;
}

/* Numbered Feature List (More Details) */
.numbered-feature-list {
    list-style: none;
    counter-reset: feature-counter;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.numbered-feature-list li {
    position: relative;
    padding-left: 30px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.numbered-feature-list li::before {
    counter-increment: feature-counter;
    content: "0" counter(feature-counter) ".";
    position: absolute;
    left: 0;
    top: 0;
    color: #6366f1;
    /* Indigo accent */
    font-weight: 600;
}

/* Teachers Grid */
.teachers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 20px;
    text-align: center;
}

.teacher-card {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.teacher-img-circle {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background-color: #e5e7eb;
    background-size: cover;
    background-position: center;
    margin-bottom: 12px;
    border: 3px solid #fff;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.teacher-card h4 {
    font-size: 1rem;
    margin-bottom: 4px;
}

.teacher-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* --- Reference Card Sidebar --- */
.reference-card {
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 25px rgba(0, 0, 0, 0.08);
    overflow: hidden;
    position: sticky;
    top: 20px;
    border: 1px solid #f3f4f6;
}

/* --- Reference Footer Styling --- */
.ref-footer {
    background: #fff;
    padding: 60px 4%;
    border-top: 1px solid #e5e7eb;
    margin-top: 80px;
    font-size: 0.9rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
    gap: 40px;
    max-width: 100%;
}

.footer-brand-col {
    padding-right: 40px;
}

.footer-brand-col p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 20px;
}

.app-buttons {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
}

.app-btn img {
    height: 40px;
    width: auto;
}

.social-links-row {
    display: flex;
    align-items: center;
    gap: 15px;
    font-weight: 600;
}

.social-links-row a {
    color: var(--text-primary);
    font-size: 1.2rem;
    transition: color 0.2s;
}

.social-links-row a:hover {
    color: var(--primary);
}

.footer-links-col {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links-col h4 {
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-primary);
    font-size: 1rem;
}

.footer-links-col a {
    color: #4b5563;
    text-decoration: none;
    transition: color 0.2s;
}

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

/* Footer Responsive */
@media (max-width: 1024px) {
    .footer-content {
        grid-template-columns: 1fr 1fr 1fr;
    }

    .footer-brand-col {
        grid-column: span 3;
        margin-bottom: 30px;
    }
}

@media (max-width: 600px) {
    .footer-content {
        grid-template-columns: 1fr !important;
        text-align: center !important;
        gap: 30px !important;
    }

    .footer-brand-col {
        grid-column: span 1 !important;
        padding-right: 0 !important;
    }

    .footer-logo {
        display: flex !important;
        flex-direction: column !important;
        align-items: center !important;
    }

    .footer-links-col {
        align-items: center !important;
    }

    .app-buttons {
        justify-content: center !important;
    }

    .social-links-row {
        justify-content: center !important;
    }
}

.card-banner-top {
    background: #4f46e5;
    /* Indigo */
    color: white;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 4px 12px;
    display: inline-block;
    border-top-left-radius: 12px;
    border-bottom-right-radius: 12px;
    margin-bottom: 10px;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 10;
}

.ref-card-body {
    padding: 20px;
}

.ref-course-img {
    width: 100%;
    border-radius: 8px;
    display: block;
    margin-bottom: 16px;
    aspect-ratio: 16/9;
    object-fit: cover;
}

.ref-card-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.ref-badge {
    background: #f3f4f6;
    color: #4b5563;
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 0.8rem;
    display: inline-block;
    margin-bottom: 16px;
}

.ref-dates {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.ref-price-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
}

.ref-price-current {
    font-size: 1.5rem;
    font-weight: 700;
    color: #6366f1;
    /* Indigo */
}

.ref-price-original {
    text-decoration: line-through;
    color: #9ca3af;
    font-size: 0.95rem;
}

.ref-discount-tag {
    background: #dcfce7;
    color: #166534;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
}

.ref-btn-action {
    width: 100%;
    background: #6366f1;
    color: white;
    padding: 14px;
    font-weight: 600;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    transition: background 0.2s;
}

.ref-btn-action:hover {
    background: #4f46e5;
}

.sidebar-simple-card {
    background: #fff;
    border-radius: 12px;
    padding: 20px;
    margin-top: 20px;
    border: 1px solid #f3f4f6;
}

/* --- Added by Antigravity: UI Polish --- */
.add-to-cart-btn {
    background: var(--gradient-main);
    color: white;
    border: none;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 10px rgba(109, 40, 217, 0.3);
}

.add-to-cart-btn:hover {
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 6px 14px rgba(109, 40, 217, 0.5);
}

.add-to-cart-btn:active {
    transform: scale(0.95);
}

.add-to-cart-btn i {
    font-size: 1rem;
}

/* --- Product Description Left Alignment --- */
.course-description-text,
.markdown-content,
.detail-section .course-description-text,
.detail-section .markdown-content,
.product-main-content .course-description-text,
.product-main-content .markdown-content {
    text-align: left !important;
}

.course-description-text p,
.markdown-content p,
.course-description-text ul,
.markdown-content ul,
.course-description-text ol,
.markdown-content ol,
.detail-section p,
.detail-section ul,
.detail-section ol,
.numbered-feature-list,
.numbered-feature-list li {
    text-align: left !important;
}

/* --- Enhanced Mobile Responsiveness --- */
@media (max-width: 768px) {
    .product-layout-v2 {
        grid-template-columns: 1fr;
        gap: 20px;
        padding: 0 16px;
        margin: 20px auto 100px;
    }

    .product-title-group h1 {
        font-size: 1.5rem;
    }

    .sidebar-v2 {
        order: -1;
        /* Show sidebar first on mobile */
    }

    .reference-card {
        margin-bottom: 20px;
    }

    .detail-section {
        padding: 20px;
    }

    .section-title {
        font-size: 1.2rem;
    }

    /* Mobile Buy Bar - Fixed at bottom */
    .mobile-buy-bar {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        border-top: 1px solid var(--border-color);
        padding: 12px 16px;
        display: flex;
        justify-content: space-between;
        align-items: center;
        z-index: 1000;
        box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.1);
    }

    .m-price-info {
        display: flex;
        flex-direction: column;
    }

    .m-label {
        font-size: 0.75rem;
        color: var(--text-secondary);
    }

    .m-price {
        font-size: 1.25rem;
        font-weight: 700;
        color: var(--primary);
    }

    .m-actions {
        display: flex;
        gap: 10px;
    }

    .m-actions .btn {
        padding: 10px 16px;
        font-size: 0.9rem;
    }
}

/* --- Fix Sidebar Scrolling (User Request) --- */
/* --- Fix Sidebar Scrolling (User Reverted again) --- */
/* Scrollable with page (Static) */
.sidebar-v2 {
    position: static;
}

@media (min-width: 769px) {
    .mobile-buy-bar {
        display: none !important;
    }
}

/* --- AI Tutor & Description Enhancements --- */
.ai-lesson-body,
.markdown-content {
    overflow-wrap: break-word;
    word-wrap: break-word;
    word-break: break-word;
    line-height: 1.8 !important;
}

.ai-lesson-body pre,
.markdown-content pre {
    white-space: pre-wrap;
    word-wrap: break-word;
    overflow-x: auto;
}

/* Pin emoji bullets for AI-generated markdown lists */
#ai-description ul,
#ai-description ol,
.markdown-content ul,
.markdown-content ol {
    list-style: none !important;
    padding-left: 0;
    margin: 16px 0;
}

#ai-description li,
.markdown-content li {
    position: relative;
    padding-left: 32px;
    margin-bottom: 12px;
    line-height: 1.7;
    margin-left: 0 !important;
}

#ai-description li::before,
.markdown-content li::before {
    content: "\1F4CC";
    position: absolute;
    left: 0;
    top: 2px;
    font-size: 1.1rem;
    line-height: 1;
    display: inline-block;
}

/* Fix product main content width to prevent sidebar push-down */
.product-main-content {
    min-width: 0;
}

/* --- FAQ Accordion Sizing & Animation --- */
/* Ensure FAQs are clean and clickable */
.accordion-header {
    cursor: pointer;
    user-select: none;
    transition: background 0.2s;
    border-radius: 8px;
}

.accordion-header:hover {
    background: #f9fafb;
}

.accordion-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-out, padding 0.3s ease;
    padding-top: 0;
    padding-bottom: 0;
}

.accordion-item.active .accordion-body {
    /* Max-height set by JS */
    padding-top: 15px;
    padding-bottom: 15px;
}

.accordion-arrow {
    transition: transform 0.3s ease;
}

.accordion-item.active .accordion-arrow {
    transform: rotate(180deg);
}

/* --- AI Tutor - Bookish / GFG Style --- */
.gfg-style-content {
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    color: #333;
}

.gfg-note {
    background-color: #f0fdf4;
    /* Light Green */
    border-left: 5px solid #22c55e;
    padding: 15px;
    margin: 20px 0;
    border-radius: 4px;
    font-size: 0.95rem;
    color: #15803d;
}

.gfg-tip {
    background-color: #fffbeb;
    /* Light Yellow */
    border-left: 5px solid #f59e0b;
    padding: 15px;
    margin: 20px 0;
    border-radius: 4px;
    font-size: 0.95rem;
    color: #b45309;
}

.gfg-code-block {
    background: #f1f5f9;
    padding: 15px;
    border-radius: 6px;
    border: 1px solid #e2e8f0;
    font-family: 'Courier New', Courier, monospace;
    overflow-x: auto;
    margin: 15px 0;
}

.ai-lesson-body h3 {
    border-bottom: 2px solid #e5e7eb;
    padding-bottom: 8px;
    margin-top: 30px;
    color: #1f2937;
}

/* --- EMERGENCY FIXES (Header, Chatbot, Cart) --- */

/* 1. Header Layout (Mobile) - Premium Centered Look */
@media (max-width: 480px) {
    .navbar .nav-container {
        padding: 0 12px !important;
    }

    .header-top {
        display: flex !important;
        align-items: center !important;
        justify-content: space-between !important;
        position: relative !important;
        /* For absolute centering */
        width: 100% !important;
        height: 60px !important;
    }

    /* LEFT: Hamburger + Logo Icon */
    .nav-left {
        display: flex !important;
        align-items: center !important;
        gap: 8px !important;
        flex: 0 0 auto !important;
    }

    .hamburger-btn {
        margin-right: 0 !important;
    }

    .nav-logo-img {
        height: 32px !important;
        width: auto !important;
        margin: 0 !important;
        display: block !important;
    }

    /* CENTER: Logo Text "RMkart" - LEFT ALIGNED (Static) for visibility */
    .logo {
        position: static !important;
        /* Reset link positioning */
        display: flex !important;
        align-items: center !important;
    }

    .logo-text {
        display: block !important;
        /* Show text */
        position: static !important;
        /* Static flow, not absolute */
        font-size: 1.3rem !important;
        /* Slightly smaller for safety */
        white-space: nowrap !important;
        margin-left: 2px !important;
        /* Reduced gap */
        transform: none !important;
        /* Remove centering transform */
    }

    /* RIGHT: Search + Logo + Account */
    .nav-right {
        display: flex !important;
        align-items: center !important;
        gap: 4px !important;
        /* Tighter gap */
        flex: 0 0 auto !important;
        margin-left: auto !important;
    }

    /* Icon Buttons (Search, Cart) */
    .search-btn,
    .cart-btn {
        padding: 5px !important;
        margin: 0 !important;
        font-size: 1rem !important;
        display: flex !important;
        align-items: center !important;
        justify-content: center !important;
    }

    .cart-count {
        top: -2px !important;
        right: -2px !important;
    }

    /* My Account / Login Button -> Image Logo */
    nav .nav-right .btn,
    nav .nav-right #authBtn {
        width: 36px !important;
        height: 36px !important;
        border-radius: 50% !important;
        padding: 0 !important;
        min-width: 0 !important;
        box-shadow: none !important;
        overflow: hidden !important;

        /* Image Background */
        background: url('Images/my_account_icon.png') !important;
        background-size: cover !important;
        background-position: center !important;
        background-color: transparent !important;
        border: none !important;

        /* Hide Text */
        font-size: 0 !important;
        color: transparent !important;
    }

    /* Hide text & icons inside Account button */
    .my-account-btn span,
    #authBtn span,
    .login-btn span,
    .btn-primary span {
        display: none !important;
    }

    .my-account-btn i,
    #authBtn i,
    .login-btn i {
        display: none !important;
    }

    .login-btn::before {
        display: none !important;
    }
}

/* --- CHATBOT LOGO REPLACEMENT --- */
.chatbot-toggler {
    background: transparent !important;
    box-shadow: none !important;
    border: none !important;
    /* Increase Size - Adjusted to 45px per user request */
    width: 45px !important;
    height: 45px !important;
    right: 50px !important;
    /* Moved left ~5mm (20px) from 30px */
    animation: chatbotPulse 2s infinite !important;
    border-radius: 50% !important;
    /* Ensure glow is round */
}

@keyframes chatbotPulse {
    0% {
        box-shadow: 0 0 0 0 rgba(99, 102, 241, 0.7);
    }

    70% {
        box-shadow: 0 0 0 15px rgba(99, 102, 241, 0);
    }

    100% {
        box-shadow: 0 0 0 0 rgba(99, 102, 241, 0);
    }
}

/* First span is Open Icon -> Replace with Image */
.chatbot-toggler span:first-child {
    background-image: url('Images/chatbot_icon.png') !important;
    background-size: contain !important;
    background-repeat: no-repeat !important;
    background-position: center !important;
    width: 100% !important;
    height: 100% !important;
    transform: scale(1.2) !important;
    /* Slight Zoom for effect */
}

/* Hide first-child (open icon) when chat is open */
body.show-chatbot .chatbot-toggler span:first-child {
    opacity: 0 !important;
    transform: scale(0.5) rotate(-90deg) !important;
}

/* Hide FontAwesome Icon inside */
.chatbot-toggler span:first-child i {
    display: none !important;
}

/* Close Icon (X) styling when chat is open */

/* 2. Cart Footer Dark Theme Fix - Force White */
.mobile-cart-footer {
    background-color: #ffffff !important;
    border-top: 1px solid #e5e7eb !important;
    color: #1f2937 !important;
}

.mobile-cart-footer .m-label {
    color: #6b7280 !important;
}

.mobile-cart-footer .m-price {
    color: #000000 !important;
}

/* 3. Chatbot Icon Fix - Reset Dimensions */
.chatbot-toggler {
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
}

.chatbot-toggler span {
    position: absolute !important;
    top: 50% !important;
    left: 50% !important;
    transform: translate(-50%, -50%) !important;
    width: auto !important;
    height: auto !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
}

.chatbot-toggler i {
    font-size: 1.5rem !important;
}

/* --- Mobile Button Fix (Reduce Fatness) --- */
@media (max-width: 768px) {
    /* Previous content preserved, see bottom */
}

/* --- EMERGENCY FIXES (Header, Chatbot, Cart) v2 --- */

/* 1. Header Collapse Fix (Mobile) */


/* 2. Cart Footer Dark Theme Fix */
.mobile-cart-footer {
    background-color: #ffffff !important;
    border-top: 1px solid #e5e7eb !important;
    color: #1f2937 !important;
    box-shadow: 0 -4px 6px -1px rgba(0, 0, 0, 0.1);
}

.mobile-cart-footer .m-label {
    color: #6b7280 !important;
}

.mobile-cart-footer .m-price {
    color: #6d28d9 !important;
    /* Primary color */
}

/* 3. Chatbot Icon Fix */
.chatbot-toggler {
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
}

/* Ensure icon spans are centered overlay */
.chatbot-toggler span {
    display: flex !important;
    width: 100% !important;
    height: 100% !important;
    align-items: center !important;
    justify-content: center !important;
    position: absolute !important;
    top: 0;
    left: 0;
}

.chatbot-toggler i {
    font-size: 1.6rem !important;
    line-height: 1 !important;
}

/* Restore the Mobile Button Fix Block (Duplicate but overrides previous empty block) */
@media (max-width: 768px) {

    .btn,
    button,
    .back-btn,
    input[type="submit"],
    .action-btn,
    a[class*="btn"] {
        padding: 8px 16px !important;
        height: auto !important;
        line-height: 1.4 !important;
        font-size: 0.95rem !important;
        min-height: 0 !important;
        margin-top: 5px !important;
        margin-bottom: 5px !important;
        display: inline-flex !important;
        align-items: center;
        justify-content: center;
    }
}

.btn,
button,
.back-btn,
input[type="submit"],
.action-btn,
a[class*="btn"] {
    padding: 8px 16px !important;
    /* Smaller padding */
    height: auto !important;
    line-height: 1.4 !important;
    font-size: 0.95rem !important;
    min-height: 0 !important;
    margin-top: 5px !important;
    margin-bottom: 5px !important;
    display: inline-flex !important;
    align-items: center;
    justify-content: center;
}
}

/* --- MOBILE RESPONSIVE ENHANCEMENTS --- */
@media (max-width: 600px) {

    /* FAQ Accordion Mobile Fix */
    .accordion-container {
        gap: 8px !important;
    }

    .accordion-header {
        padding: 14px 16px !important;
    }

    .accordion-title {
        font-size: 0.9rem !important;
    }

    .accordion-body {
        padding: 0 16px !important;
    }

    .accordion-body p {
        font-size: 0.88rem !important;
        padding: 12px 0 !important;
    }

    /* Section Titles */
    .section-title {
        font-size: 1.2rem !important;
    }

    .course-title-large {
        font-size: 1.6rem !important;
    }

    /* Product Layout Mobile */
    .product-layout-v2 {
        padding: 0 16px !important;
        gap: 20px !important;
        margin: 20px auto 60px !important;
    }

    .detail-section {
        margin-bottom: 30px !important;
    }

    /* Feature List Mobile */
    .feature-list-prominent li {
        gap: 12px !important;
    }

    .feat-icon {
        width: 32px !important;
        height: 32px !important;
        font-size: 0.9rem !important;
    }

    .feat-info {
        font-size: 0.88rem !important;
    }

    /* Badges */
    .badges-row {
        flex-wrap: wrap !important;
    }

    .badge-pill {
        font-size: 0.75rem !important;
        padding: 4px 10px !important;
    }

    /* Numbered List */
    .numbered-feature-list li {
        padding-left: 24px !important;
        font-size: 0.88rem !important;
    }

    /* Reference Card Sidebar */
    .reference-card {
        margin: 0 -16px !important;
        border-radius: 0 !important;
    }

    .ref-card-body {
        padding: 16px !important;
    }

    .ref-card-title {
        font-size: 1.1rem !important;
    }

    .ref-btn-action {
        padding: 12px !important;
        font-size: 0.95rem !important;
    }

    /* Mobile Buy Bar */
    .mobile-buy-bar {
        padding: 12px 16px !important;
    }
}