/* ===== CSS VARIABLES ===== */
:root {
    --primary: #FF8200;
    --primary-dark: #e07000;
    --primary-light: #ffad4d;
    --secondary: #1c1d1f;
    --accent: #009A44;
    --success: #009A44;
    --warning: #f69c08;
    --danger: #ef4444;
    --white: #ffffff;
    --gray-50: #f8f9fa;
    --gray-100: #f1f1f1;
    --gray-200: #e8e8e8;
    --gray-300: #d1d1d1;
    --gray-400: #9a9a9a;
    --gray-500: #6a6f73;
    --gray-600: #4b4f54;
    --gray-700: #3e4143;
    --gray-800: #2d2f31;
    --gray-900: #1c1d1f;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.12);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.16);
    --shadow-xl: 0 12px 48px rgba(0,0,0,0.2);
    --radius-sm: 6px;
    --radius: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== RESET & BASE ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font);
    color: var(--gray-800);
    line-height: 1.6;
    background: var(--white);
    -webkit-font-smoothing: antialiased;
}

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

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

ul { list-style: none; }

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border: 2px solid transparent;
    border-radius: var(--radius-sm);
    font-family: var(--font);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}
.btn-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background: transparent;
    color: var(--gray-800);
    border-color: var(--gray-800);
}
.btn-outline:hover {
    background: var(--gray-800);
    color: var(--white);
}

.btn-white {
    background: var(--white);
    color: var(--primary);
    border-color: var(--white);
}
.btn-white:hover {
    background: var(--gray-100);
    transform: translateY(-1px);
}

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

.btn-lg {
    padding: 14px 28px;
    font-size: 16px;
    border-radius: var(--radius);
}

.btn-sm {
    padding: 6px 14px;
    font-size: 13px;
}

.btn-block {
    width: 100%;
}

/* ===== NAVBAR ===== */
.navbar {
    position: sticky;
    top: 0;
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    z-index: 1000;
    padding: 0 0;
}

.nav-container {
    display: flex;
    align-items: center;
    height: 70px;
    gap: 24px;
}

.logo {
    font-size: 24px;
    font-weight: 800;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}
.logo i { font-size: 28px; }

.nav-search {
    flex: 1;
    max-width: 500px;
    position: relative;
}
.nav-search i {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray-400);
}
.nav-search input {
    width: 100%;
    padding: 12px 16px 12px 44px;
    border: 2px solid var(--gray-200);
    border-radius: 50px;
    font-family: var(--font);
    font-size: 14px;
    transition: var(--transition);
    background: var(--gray-50);
}
.nav-search input:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--white);
    box-shadow: 0 0 0 3px rgba(255, 130, 0, 0.1);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
}
.nav-links > li > a {
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-700);
    border-radius: var(--radius-sm);
    transition: var(--transition);
}
.nav-links > li > a:hover,
.nav-links > li > a.active {
    color: var(--primary);
}

/* Dropdown */
.dropdown { position: relative; }
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 240px;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    padding: 8px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: var(--transition);
    z-index: 100;
}
.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.dropdown-menu a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 16px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: var(--gray-700);
    transition: var(--transition);
}
.dropdown-menu a:hover {
    background: var(--gray-50);
    color: var(--primary);
}
.dropdown-menu a i { width: 20px; text-align: center; }

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--gray-700);
}

/* ===== HERO ===== */
.hero {
    background: linear-gradient(135deg, var(--gray-900) 0%, #1a3a1a 50%, var(--accent) 100%);
    padding: 80px 0 100px;
    overflow: hidden;
}
.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}
.hero-content h1 {
    font-size: 52px;
    font-weight: 800;
    color: var(--white);
    line-height: 1.15;
    margin-bottom: 20px;
}
.gradient-text {
    background: linear-gradient(135deg, var(--primary-light), #FFB347, #FF8200);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-content p {
    font-size: 18px;
    color: rgba(255,255,255,0.8);
    margin-bottom: 32px;
    max-width: 520px;
    line-height: 1.7;
}
.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
}
.hero-stats {
    display: flex;
    gap: 40px;
}
.hero-stats .stat {
    text-align: center;
}
.hero-stats .stat strong {
    display: block;
    font-size: 28px;
    font-weight: 800;
    color: var(--white);
}
.hero-stats .stat span {
    font-size: 14px;
    color: rgba(255,255,255,0.6);
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}
.hero-card {
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: var(--radius-xl);
    padding: 60px 40px;
    text-align: center;
    color: var(--white);
    width: 100%;
    max-width: 400px;
}
.hero-card-icon {
    font-size: 80px;
    margin-bottom: 24px;
    color: var(--primary-light);
}
.hero-card h3 {
    font-size: 24px;
    margin-bottom: 12px;
}
.hero-card p {
    font-size: 16px;
    color: rgba(255,255,255,0.7);
}

/* ===== TRUSTED BY ===== */
.trusted-by {
    background: var(--gray-50);
    padding: 30px 0;
    text-align: center;
}
.trusted-by p {
    font-size: 14px;
    color: var(--gray-400);
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 500;
}
.trusted-logos {
    display: flex;
    justify-content: center;
    gap: 48px;
    align-items: center;
    flex-wrap: wrap;
}
.trusted-logos span {
    font-size: 22px;
    font-weight: 700;
    color: var(--gray-300);
    letter-spacing: -0.5px;
}

/* ===== SECTION STYLES ===== */
.section-header {
    text-align: center;
    margin-bottom: 48px;
}
.section-header h2 {
    font-size: 36px;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 12px;
}
.section-header p {
    font-size: 18px;
    color: var(--gray-500);
    max-width: 600px;
    margin: 0 auto;
}

/* ===== CATEGORIES ===== */
.categories {
    padding: 80px 0;
}
.categories-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}
.category-card {
    background: var(--white);
    border: 2px solid var(--gray-100);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
}
.category-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}
.category-icon {
    width: 64px;
    height: 64px;
    border-radius: var(--radius);
    background: linear-gradient(135deg, rgba(255,130,0,0.1), rgba(0,154,68,0.1));
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    font-size: 28px;
    color: var(--primary);
    transition: var(--transition);
}
.category-card:hover .category-icon {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: var(--white);
    transform: scale(1.1);
}
.category-card h3 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 4px;
    color: var(--gray-800);
}
.category-card p {
    font-size: 13px;
    color: var(--gray-400);
}

/* ===== COURSES ===== */
.featured-courses {
    padding: 80px 0;
    background: var(--gray-50);
}

.courses-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 32px;
    flex-wrap: wrap;
    justify-content: center;
}
.tab {
    padding: 8px 20px;
    border: 2px solid var(--gray-200);
    border-radius: 50px;
    background: var(--white);
    font-family: var(--font);
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-600);
    cursor: pointer;
    transition: var(--transition);
}
.tab:hover { border-color: var(--primary); color: var(--primary); }
.tab.active {
    background: var(--primary);
    border-color: var(--primary);
    color: var(--white);
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.course-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid var(--gray-100);
    display: flex;
    flex-direction: column;
}
.course-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.course-image {
    position: relative;
    overflow: hidden;
}
.course-image-placeholder {
    height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 56px;
    color: rgba(255,255,255,0.9);
}
.course-image-placeholder.dev { background: linear-gradient(135deg, #004d22, #009A44); }
.course-image-placeholder.dev2 { background: linear-gradient(135deg, #1a4731, #22c55e); }
.course-image-placeholder.dev3 { background: linear-gradient(135deg, #7a4400, #FF8200); }
.course-image-placeholder.design { background: linear-gradient(135deg, #b35c00, #ffad4d); }
.course-image-placeholder.business { background: linear-gradient(135deg, #004d22, #00c957); }
.course-image-placeholder.marketing { background: linear-gradient(135deg, #7a4400, #FF8200); }
.course-image-placeholder.photo { background: linear-gradient(135deg, #44403c, #a8a29e); }
.course-image-placeholder.music { background: linear-gradient(135deg, #004d22, #3ddc84); }
.course-image-placeholder.large {
    height: 220px;
    position: relative;
    cursor: pointer;
}
.play-overlay {
    position: absolute;
    width: 64px;
    height: 64px;
    background: rgba(0,0,0,0.6);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: var(--white);
    transition: var(--transition);
}
.course-image-placeholder.large:hover .play-overlay {
    background: var(--primary);
    transform: scale(1.1);
}

.badge {
    position: absolute;
    top: 12px;
    left: 12px;
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 700;
    color: var(--white);
    z-index: 2;
}
.badge.bestseller { background: #ecb814; color: var(--gray-900); }
.badge.new { background: var(--accent); }
.badge.hot { background: var(--danger); }

.wishlist-btn {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--white);
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    font-size: 16px;
    color: var(--gray-600);
    z-index: 2;
    box-shadow: var(--shadow-sm);
}
.wishlist-btn:hover { color: var(--danger); transform: scale(1.1); }
.wishlist-btn.active { color: var(--danger); }
.wishlist-btn.active i { font-weight: 900; }

.course-content {
    padding: 16px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.course-meta {
    display: flex;
    gap: 8px;
    margin-bottom: 8px;
}
.course-category {
    font-size: 11px;
    font-weight: 600;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.course-level {
    font-size: 11px;
    color: var(--gray-400);
    padding-left: 8px;
    border-left: 1px solid var(--gray-200);
}

.course-content h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--gray-900);
    line-height: 1.4;
    margin-bottom: 6px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.course-card:hover h3 { color: var(--primary); }

.course-instructor {
    font-size: 13px;
    color: var(--gray-500);
    margin-bottom: 8px;
}

.course-rating {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 8px;
}
.rating-score {
    font-size: 14px;
    font-weight: 700;
    color: var(--warning);
}
.stars { color: var(--warning); font-size: 13px; display: flex; gap: 1px; }
.rating-count { font-size: 12px; color: var(--gray-400); }

.course-details {
    display: flex;
    gap: 16px;
    font-size: 12px;
    color: var(--gray-500);
    margin-bottom: 12px;
}
.course-details span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.course-footer {
    margin-top: auto;
    padding-top: 12px;
    border-top: 1px solid var(--gray-100);
}
.course-price {
    display: flex;
    align-items: center;
    gap: 8px;
}
.price-current {
    font-size: 20px;
    font-weight: 800;
    color: var(--gray-900);
}
.price-original {
    font-size: 14px;
    color: var(--gray-400);
    text-decoration: line-through;
}

.section-cta {
    text-align: center;
    margin-top: 40px;
}

/* ===== HOW IT WORKS ===== */
.how-it-works {
    padding: 80px 0;
}
.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}
.step-card {
    text-align: center;
    padding: 40px 24px;
    position: relative;
}
.step-number {
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 100px;
    font-weight: 900;
    color: var(--gray-100);
    line-height: 1;
    z-index: 0;
}
.step-icon {
    position: relative;
    z-index: 1;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    font-size: 32px;
    color: var(--white);
}
.step-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--gray-900);
    position: relative;
    z-index: 1;
}
.step-card p {
    font-size: 15px;
    color: var(--gray-500);
    position: relative;
    z-index: 1;
}

/* ===== INSTRUCTORS ===== */
.instructors {
    padding: 80px 0;
    background: var(--gray-50);
}
.instructors-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.instructor-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    text-align: center;
    border: 1px solid var(--gray-100);
    transition: var(--transition);
}
.instructor-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}
.instructor-avatar {
    margin-bottom: 16px;
}
.avatar-placeholder {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    font-size: 32px;
    color: var(--white);
}
.instructor-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 4px;
}
.instructor-title {
    font-size: 14px;
    color: var(--gray-500);
    margin-bottom: 16px;
}
.instructor-stats {
    display: flex;
    justify-content: center;
    gap: 16px;
    font-size: 13px;
    color: var(--gray-600);
}
.instructor-stats span {
    display: flex;
    align-items: center;
    gap: 4px;
}
.instructor-stats .fa-star { color: var(--warning); }

/* ===== TESTIMONIALS ===== */
.testimonials {
    padding: 80px 0;
}
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.testimonial-card {
    background: var(--white);
    border: 2px solid var(--gray-100);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: var(--transition);
}
.testimonial-card:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
}
.testimonial-stars {
    color: var(--warning);
    font-size: 16px;
    margin-bottom: 16px;
    display: flex;
    gap: 2px;
}
.testimonial-card > p {
    font-size: 15px;
    color: var(--gray-600);
    line-height: 1.7;
    margin-bottom: 20px;
    font-style: italic;
}
.testimonial-author {
    display: flex;
    align-items: center;
    gap: 12px;
}
.author-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 18px;
    flex-shrink: 0;
}
.testimonial-author strong {
    display: block;
    font-size: 15px;
    color: var(--gray-900);
}
.testimonial-author span {
    font-size: 13px;
    color: var(--gray-400);
}

/* ===== CTA SECTION ===== */
.cta-section {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--gray-900), var(--accent));
}
.cta-content {
    text-align: center;
    max-width: 640px;
    margin: 0 auto;
}
.cta-content h2 {
    font-size: 36px;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 16px;
}
.cta-content p {
    font-size: 18px;
    color: rgba(255,255,255,0.8);
    margin-bottom: 32px;
}
.cta-actions { display: flex; gap: 16px; justify-content: center; }

/* ===== FOOTER ===== */
.footer {
    background: var(--gray-900);
    color: rgba(255,255,255,0.7);
    padding: 60px 0 0;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-brand .logo {
    margin-bottom: 16px;
}
.footer-brand p {
    font-size: 14px;
    line-height: 1.7;
    margin-bottom: 20px;
}
.social-links {
    display: flex;
    gap: 12px;
}
.social-links a {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255,255,255,0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255,255,255,0.7);
    transition: var(--transition);
    font-size: 16px;
}
.social-links a:hover {
    background: var(--primary);
    color: var(--white);
    transform: translateY(-2px);
}

.footer-links h4 {
    font-size: 16px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 20px;
}
.footer-links a {
    display: block;
    font-size: 14px;
    padding: 6px 0;
    color: rgba(255,255,255,0.6);
    transition: var(--transition);
}
.footer-links a:hover { color: var(--white); padding-left: 4px; }

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 0;
    font-size: 13px;
}
.footer-bottom-links {
    display: flex;
    gap: 24px;
}
.footer-bottom-links a { color: rgba(255,255,255,0.5); transition: var(--transition); }
.footer-bottom-links a:hover { color: var(--white); }

/* ===== PAGE HEADER ===== */
.page-header {
    background: linear-gradient(135deg, var(--gray-900), var(--accent));
    padding: 48px 0;
    color: var(--white);
}
.page-header h1 {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 8px;
}
.page-header p {
    font-size: 16px;
    color: rgba(255,255,255,0.7);
    margin-bottom: 16px;
}
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
}
.breadcrumb a { color: rgba(255,255,255,0.6); transition: var(--transition); }
.breadcrumb a:hover { color: var(--white); }
.breadcrumb i { font-size: 10px; color: rgba(255,255,255,0.3); }
.breadcrumb span { color: rgba(255,255,255,0.9); }

/* ===== COURSES PAGE ===== */
.courses-page {
    padding: 40px 0 80px;
}
.courses-layout {
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: 32px;
}

/* Sidebar Filters */
.courses-sidebar {
    position: sticky;
    top: 90px;
    align-self: start;
    max-height: calc(100vh - 110px);
    overflow-y: auto;
}
.filter-section {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}
.filter-section h3 {
    font-size: 18px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 8px;
}
.filter-group {
    margin-bottom: 24px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--gray-100);
}
.filter-group h4 {
    font-size: 14px;
    font-weight: 700;
    color: var(--gray-800);
    margin-bottom: 12px;
}
.filter-checkbox,
.filter-radio {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--gray-600);
    padding: 6px 0;
    cursor: pointer;
}
.filter-checkbox input,
.filter-radio input {
    accent-color: var(--primary);
    width: 16px;
    height: 16px;
}
.filter-checkbox .count,
.filter-radio .count {
    margin-left: auto;
    color: var(--gray-400);
    font-size: 12px;
}
.stars-small {
    color: var(--warning);
    font-size: 12px;
    display: flex;
    gap: 1px;
}

/* Courses Main */
.courses-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--gray-100);
}
.results-info {
    font-size: 14px;
    color: var(--gray-500);
}
.toolbar-actions {
    display: flex;
    gap: 12px;
    align-items: center;
}
.sort-select {
    padding: 8px 16px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-sm);
    font-family: var(--font);
    font-size: 13px;
    color: var(--gray-700);
    cursor: pointer;
    background: var(--white);
}
.sort-select:focus { outline: none; border-color: var(--primary); }
.view-toggle {
    display: flex;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-sm);
    overflow: hidden;
}
.view-btn {
    padding: 6px 12px;
    border: none;
    background: var(--white);
    cursor: pointer;
    color: var(--gray-400);
    transition: var(--transition);
}
.view-btn.active {
    background: var(--primary);
    color: var(--white);
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 40px;
}
.page-btn {
    width: 40px;
    height: 40px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-sm);
    background: var(--white);
    font-family: var(--font);
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-600);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}
.page-btn:hover:not(.disabled):not(.active) { border-color: var(--primary); color: var(--primary); }
.page-btn.active { background: var(--primary); border-color: var(--primary); color: var(--white); }
.page-btn.disabled { opacity: 0.4; cursor: not-allowed; }
.page-dots { display: flex; align-items: center; color: var(--gray-400); }

/* ===== COURSE DETAIL PAGE ===== */
.course-hero {
    background: var(--gray-900);
    padding: 40px 0;
    color: var(--white);
}
.course-hero-content { max-width: 700px; }
.course-hero-content .breadcrumb { margin-bottom: 20px; }
.course-hero-content h1 {
    font-size: 32px;
    font-weight: 800;
    margin-bottom: 16px;
    line-height: 1.3;
}
.course-hero-desc {
    font-size: 16px;
    color: rgba(255,255,255,0.8);
    margin-bottom: 16px;
    line-height: 1.7;
}
.course-hero-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}
.course-hero-meta .course-rating { margin: 0; }
.course-hero-meta .rating-count { color: rgba(255,255,255,0.6); }
.course-hero-meta span { font-size: 14px; color: rgba(255,255,255,0.7); }
.meta-separator { color: rgba(255,255,255,0.3); }
.course-hero-instructor {
    font-size: 14px;
    color: rgba(255,255,255,0.7);
    margin-bottom: 12px;
}
.course-hero-instructor a {
    color: var(--primary-light);
    text-decoration: underline;
}
.course-hero-info {
    display: flex;
    gap: 20px;
    font-size: 13px;
    color: rgba(255,255,255,0.6);
    flex-wrap: wrap;
}
.course-hero-info span { display: flex; align-items: center; gap: 6px; }

.course-detail-page { padding: 40px 0 80px; }
.course-detail-layout {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: 32px;
    align-items: start;
}

.detail-card {
    background: var(--white);
    border: 1px solid var(--gray-100);
    border-radius: var(--radius-lg);
    padding: 32px;
    margin-bottom: 24px;
}
.detail-card h2 {
    font-size: 22px;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 20px;
}

/* Learning Grid */
.learning-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}
.learning-item {
    display: flex;
    gap: 12px;
    font-size: 14px;
    color: var(--gray-700);
    line-height: 1.5;
}
.learning-item i { color: var(--success); margin-top: 4px; flex-shrink: 0; }

/* Requirements */
.requirements-list {
    list-style: none;
}
.requirements-list li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    font-size: 14px;
    color: var(--gray-700);
    padding: 8px 0;
}
.requirements-list li i { color: var(--primary); margin-top: 4px; }

/* Curriculum */
.curriculum-stats {
    display: flex;
    gap: 8px;
    font-size: 14px;
    color: var(--gray-500);
    margin-bottom: 16px;
}
.curriculum-section {
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-sm);
    margin-bottom: 4px;
    overflow: hidden;
}
.section-toggle {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px;
    background: var(--gray-50);
    border: none;
    cursor: pointer;
    font-family: var(--font);
    transition: var(--transition);
}
.section-toggle:hover { background: var(--gray-100); }
.section-title {
    display: flex;
    align-items: center;
    gap: 12px;
}
.section-title i { font-size: 12px; color: var(--gray-400); transition: var(--transition); }
.section-title h3 { font-size: 14px; font-weight: 600; color: var(--gray-800); text-align: left; }
.section-meta { font-size: 13px; color: var(--gray-500); white-space: nowrap; }

.section-content {
    display: none;
    padding: 0;
}
.section-content.open { display: block; }
.lesson {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px 12px 44px;
    border-top: 1px solid var(--gray-100);
    font-size: 14px;
}
.lesson-info {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--gray-700);
}
.lesson-info i { color: var(--gray-400); }
.lesson-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 13px;
    color: var(--gray-500);
}
.preview-badge {
    font-size: 12px;
    color: var(--primary);
    font-weight: 600;
    text-decoration: underline;
    cursor: pointer;
}

/* Description */
.description-content p {
    font-size: 15px;
    color: var(--gray-600);
    line-height: 1.7;
    margin-bottom: 16px;
}
.description-content h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--gray-800);
    margin-bottom: 12px;
}
.description-content ul {
    padding-left: 20px;
    list-style: disc;
}
.description-content li {
    font-size: 14px;
    color: var(--gray-600);
    padding: 4px 0;
}

/* Instructor Detail */
.instructor-header {
    display: flex;
    gap: 20px;
    margin-bottom: 20px;
}
.avatar-placeholder-lg {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 40px;
    color: var(--white);
    flex-shrink: 0;
}
.instructor-info h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 4px;
}
.instructor-subtitle {
    font-size: 14px;
    color: var(--gray-500);
    margin-bottom: 12px;
}
.instructor-badges {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    font-size: 13px;
    color: var(--gray-600);
}
.instructor-badges span { display: flex; align-items: center; gap: 6px; }
.instructor-badges .fa-star { color: var(--warning); }
.instructor-detail > p {
    font-size: 15px;
    color: var(--gray-600);
    line-height: 1.7;
    margin-bottom: 12px;
}

/* Reviews */
.reviews-summary {
    display: flex;
    gap: 40px;
    margin-bottom: 32px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--gray-100);
}
.reviews-score {
    text-align: center;
    flex-shrink: 0;
}
.big-score {
    font-size: 56px;
    font-weight: 800;
    color: var(--warning);
    display: block;
    line-height: 1;
}
.reviews-score .stars { justify-content: center; margin: 8px 0 4px; }
.reviews-score > span { font-size: 13px; color: var(--gray-500); }

.reviews-bars { flex: 1; }
.bar-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 6px;
    position: relative;
}
.bar-fill {
    height: 8px;
    background: var(--gray-200);
    border-radius: 4px;
    flex: 1;
    position: relative;
    overflow: hidden;
}
.bar-fill::after {
    content: '';
    position: absolute;
    left: 0; top: 0;
    height: 100%;
    width: inherit;
    background: var(--warning);
    border-radius: 4px;
}
.bar-row > span { font-size: 12px; color: var(--gray-400); min-width: 36px; }

.review {
    padding: 24px 0;
    border-bottom: 1px solid var(--gray-100);
}
.review:last-child { border-bottom: none; }
.review-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}
.review-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-500);
}
.review-header strong { font-size: 15px; }
.review-date { margin-left: auto; font-size: 13px; color: var(--gray-400); }
.review > p {
    font-size: 14px;
    color: var(--gray-600);
    line-height: 1.7;
    margin-bottom: 12px;
}
.review-actions {
    display: flex;
    gap: 16px;
}
.review-actions button {
    background: none;
    border: none;
    font-family: var(--font);
    font-size: 13px;
    color: var(--gray-500);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition);
}
.review-actions button:hover { color: var(--primary); }

/* Sidebar Card */
.sidebar-card {
    background: var(--white);
    border: 1px solid var(--gray-100);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}
.sidebar-card.sticky {
    position: sticky;
    top: 90px;
}
.sidebar-body { padding: 24px; }
.sidebar-price {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}
.price-current-lg {
    font-size: 32px;
    font-weight: 800;
    color: var(--gray-900);
}
.price-original-lg {
    font-size: 18px;
    color: var(--gray-400);
    text-decoration: line-through;
}
.discount-badge {
    background: var(--danger);
    color: var(--white);
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 13px;
    font-weight: 700;
}
.promo-timer {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--danger);
    margin-bottom: 16px;
}
.sidebar-body .btn { margin-bottom: 8px; }
.guarantee {
    text-align: center;
    font-size: 13px;
    color: var(--gray-500);
    margin: 8px 0 20px;
}
.sidebar-features h4 {
    font-size: 15px;
    font-weight: 700;
    color: var(--gray-800);
    margin-bottom: 12px;
}
.sidebar-features ul { list-style: none; }
.sidebar-features li {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    color: var(--gray-600);
    padding: 8px 0;
}
.sidebar-features li i { color: var(--gray-400); width: 20px; text-align: center; }

.sidebar-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--gray-100);
    margin-top: 16px;
}
.action-link {
    background: none;
    border: none;
    font-family: var(--font);
    font-size: 13px;
    color: var(--gray-500);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition);
}
.action-link:hover { color: var(--primary); }

/* ===== AUTH PAGES ===== */
.auth-page {
    min-height: calc(100vh - 70px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 24px;
    background: var(--gray-50);
}
.auth-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: 48px;
    width: 100%;
    max-width: 440px;
    box-shadow: var(--shadow-lg);
}
.auth-card .logo {
    justify-content: center;
    font-size: 28px;
    margin-bottom: 32px;
}
.auth-card h1 {
    font-size: 24px;
    font-weight: 800;
    color: var(--gray-900);
    text-align: center;
    margin-bottom: 8px;
}
.auth-card > p {
    text-align: center;
    font-size: 14px;
    color: var(--gray-500);
    margin-bottom: 32px;
}

.social-auth {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 24px;
}
.social-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 12px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius);
    background: var(--white);
    font-family: var(--font);
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-700);
    cursor: pointer;
    transition: var(--transition);
    width: 100%;
}
.social-btn:hover { border-color: var(--gray-300); background: var(--gray-50); }
.social-btn i { font-size: 18px; }
.social-btn .fa-google { color: #ea4335; }
.social-btn .fa-facebook-f { color: #1877f2; }
.social-btn .fa-apple { color: var(--gray-900); }

.divider {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
    font-size: 13px;
    color: var(--gray-400);
}
.divider::before,
.divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--gray-200);
}

.form-group {
    margin-bottom: 20px;
}
.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 6px;
}
.form-input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius);
    font-family: var(--font);
    font-size: 14px;
    transition: var(--transition);
}
.form-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(255, 130, 0, 0.1);
}
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    font-size: 14px;
}
.form-options label {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--gray-600);
    cursor: pointer;
}
.form-options input { accent-color: var(--primary); }
.form-options a { color: var(--primary); font-weight: 500; }

.auth-footer {
    text-align: center;
    margin-top: 24px;
    font-size: 14px;
    color: var(--gray-500);
}
.auth-footer a { color: var(--primary); font-weight: 600; }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .hero .container { grid-template-columns: 1fr; }
    .hero-image { display: none; }
    .hero-content h1 { font-size: 40px; }
    .categories-grid { grid-template-columns: repeat(3, 1fr); }
    .courses-grid { grid-template-columns: repeat(2, 1fr); }
    .instructors-grid { grid-template-columns: repeat(2, 1fr); }
    .testimonials-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
    .course-detail-layout { grid-template-columns: 1fr; }
    .course-detail-sidebar { order: -1; }
    .sidebar-card.sticky { position: static; }
}

@media (max-width: 768px) {
    .nav-search { display: none; }
    .nav-links { display: none; }
    .mobile-toggle { display: block; }

    .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--white);
        padding: 24px;
        box-shadow: var(--shadow-lg);
        gap: 12px;
        border-bottom: 1px solid var(--gray-100);
    }
    .nav-links.active .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        padding: 0 0 0 16px;
    }

    .hero-content h1 { font-size: 32px; }
    .hero-stats { gap: 20px; flex-wrap: wrap; }
    .hero-actions { flex-direction: column; }

    .categories-grid { grid-template-columns: repeat(2, 1fr); }
    .courses-grid { grid-template-columns: 1fr; }
    .steps-grid { grid-template-columns: 1fr; }
    .instructors-grid { grid-template-columns: 1fr; }
    .testimonials-grid { grid-template-columns: 1fr; }

    .courses-layout { grid-template-columns: 1fr; }
    .courses-sidebar { position: static; max-height: none; }

    .cta-actions { flex-direction: column; align-items: center; }
    .footer-grid { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }

    .learning-grid { grid-template-columns: 1fr; }
    .reviews-summary { flex-direction: column; }
    .instructor-header { flex-direction: column; align-items: center; text-align: center; }

    .auth-card { padding: 32px 24px; }
    .form-row { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
    .hero-content h1 { font-size: 28px; }
    .section-header h2 { font-size: 28px; }
    .categories-grid { grid-template-columns: 1fr; }
    .hero-stats .stat strong { font-size: 22px; }
}