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

:root {
    /* Theme Variables - Default (Dark) */
    --primary: #6366f1;
    --primary-glow: rgba(99, 102, 241, 0.5);
    --secondary: #a855f7;
    --accent: #22d3ee;
    --bg-dark: #020617;
    --bg-card: rgba(15, 23, 42, 0.7);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border-glass: rgba(255, 255, 255, 0.1);
    --glass-bg: rgba(255, 255, 255, 0.03);
    --header-bg: rgba(2, 6, 23, 0.85);
    
    /* Layout */
    --header-height: 80px;
    --container-max: 1400px;
    --radius-lg: 24px;
    --radius-md: 16px;
    
    /* Transitions */
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme Overrides */
[data-theme='light'] {
    --bg-dark: #f8fafc;
    --bg-card: rgba(255, 255, 255, 0.8);
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border-glass: rgba(15, 23, 42, 0.1);
    --glass-bg: rgba(15, 23, 42, 0.03);
    --header-bg: rgba(248, 250, 252, 0.85);
}

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

body {
    font-family: 'Plus Jakarta Sans', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    overflow-x: hidden;
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

h1, h2, h3, h4, .font-heading {
    font-family: 'Outfit', sans-serif;
}

/* Glassmorphism Utility */
.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-glass);
}

/* --- Navigation & Mega Menu --- */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    z-index: 1000;
    display: flex;
    align-items: center;
    transition: var(--transition);
}

header.scrolled {
    background: var(--header-bg);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-glass);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    width: 95%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

/* 9-dot Icon (Apps Menu) */
.apps-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-main);
    font-size: 1.4rem;
    position: relative;
}

.apps-icon:hover {
    background: var(--glass-bg);
}

.apps-dropdown {
    position: absolute;
    top: 50px;
    left: 0;
    width: 320px;
    background: var(--bg-dark);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--transition);
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.apps-icon:hover .apps-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.app-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    text-decoration: none;
    color: var(--text-main);
    font-size: 0.75rem;
    gap: 0.5rem;
    transition: var(--transition);
    padding: 0.8rem;
    border-radius: 12px;
}

.app-item:hover {
    background: var(--glass-bg);
}

.app-item i {
    font-size: 1.5rem;
    color: var(--primary);
}

.logo {
    font-size: 1.8rem;
    font-weight: 800;
    background: linear-gradient(to right, var(--text-main), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-decoration: none;
    letter-spacing: -1px;
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-item {
    position: relative;
    padding: 1rem 0;
}

.nav-link {
    color: var(--text-main);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    opacity: 0.8;
}

.nav-item:hover .nav-link {
    opacity: 1;
    color: var(--accent);
}

/* Mega Menu Engine */
.mega-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    width: 90vw;
    max-width: 1100px;
    background: var(--bg-dark);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.nav-item:hover .mega-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(10px);
}

.mega-col h4 {
    color: var(--accent);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 1.2rem;
}

.mega-col ul {
    list-style: none;
}

.mega-col li {
    margin-bottom: 0.8rem;
}

.mega-col a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
}

.mega-col a:hover {
    color: var(--text-main);
    padding-left: 5px;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Theme Toggle */
.theme-toggle {
    background: var(--glass-bg);
    border: 1px solid var(--border-glass);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-main);
    transition: var(--transition);
}

.theme-toggle:hover {
    background: var(--primary);
    color: white;
}

/* --- Hero Section --- */
.hero {
    min-height: 90vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: var(--header-height);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: radial-gradient(circle at 50% 50%, var(--bg-dark) 0%, #020617 100%);
}

.hero-image {
    position: absolute;
    right: -5%;
    top: 50%;
    transform: translateY(-50%);
    width: 55%;
    opacity: 0.5;
    mask-image: radial-gradient(circle, black 50%, transparent 90%);
}

.hero-content {
    max-width: var(--container-max);
    margin: 0 auto;
    width: 90%;
    position: relative;
    z-index: 2;
}

.hero h1 {
    font-size: clamp(3rem, 7vw, 4.5rem);
    line-height: 1.1;
    font-weight: 800;
    margin-bottom: 1.5rem;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-muted);
    max-width: 600px;
    margin-bottom: 2.5rem;
}

.search-bar {
    max-width: 600px;
    margin-top: 2rem;
    position: relative;
}

.search-bar input {
    width: 100%;
    padding: 1.2rem 1.5rem;
    padding-right: 4rem;
    border-radius: 100px;
    border: 1px solid var(--border-glass);
    background: var(--glass-bg);
    color: var(--text-main);
    font-size: 1rem;
    outline: none;
    backdrop-filter: blur(10px);
}

.search-bar i {
    position: absolute;
    right: 1.5rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--accent);
    font-size: 1.2rem;
    cursor: pointer;
}

/* --- Section Styling --- */
section {
    padding: 6rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.section-header h2 {
    font-size: 2.8rem;
    margin-bottom: 1rem;
}

/* Category Grid */
.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    max-width: var(--container-max);
    margin: 0 auto;
    width: 90%;
}

.cat-card {
    background: var(--glass-bg);
    border: 1px solid var(--border-glass);
    padding: 2.5rem 1.5rem;
    border-radius: var(--radius-md);
    text-align: center;
    transition: var(--transition);
    text-decoration: none;
    color: var(--text-main);
}

.cat-card:hover {
    background: var(--primary);
    transform: translateY(-5px);
    border-color: var(--primary);
    color: white;
    box-shadow: 0 15px 30px -10px var(--primary-glow);
}

.cat-card i {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    display: block;
    color: var(--accent);
    transition: var(--transition);
}

.cat-card:hover i {
    color: white;
}

/* Course Grid */
.grid-courses {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
    max-width: var(--container-max);
    margin: 0 auto;
    width: 90%;
}

.course-card {
    border-radius: var(--radius-lg);
    background: var(--bg-card);
    border: 1px solid var(--border-glass);
    padding: 1.5rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.course-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary);
    box-shadow: 0 20px 40px -15px rgba(0,0,0,0.5);
}

.course-img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: 12px;
    margin-bottom: 1.5rem;
}

.course-badge {
    position: absolute;
    top: 2rem;
    left: 2rem;
    background: var(--accent);
    color: var(--bg-dark);
    padding: 0.3rem 0.8rem;
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 700;
}

.course-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-glass);
    font-size: 0.85rem;
    color: var(--text-muted);
}

.course-rating {
    color: #fbbf24;
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.course-price {
    font-weight: 800;
    font-size: 1.25rem;
    color: var(--accent);
}

/* Learning Path Cards */
.path-grid {
    max-width: var(--container-max);
    margin: 0 auto;
    width: 90%;
}

.path-card {
    display: flex;
    align-items: center;
    gap: 2.5rem;
    background: var(--glass-bg);
    padding: 3rem;
    border-radius: var(--radius-lg);
    margin-bottom: 2rem;
    border: 1px solid var(--border-glass);
    transition: var(--transition);
}

.path-card:hover {
    border-color: var(--accent);
    background: rgba(34, 211, 238, 0.03);
}

.path-icon {
    width: 100px;
    height: 100px;
    background: var(--primary);
    border-radius: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: white;
    flex-shrink: 0;
}

/* Testimonials */
.testi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    max-width: var(--container-max);
    margin: 0 auto;
    width: 90%;
}

.testi-card {
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    background: var(--glass-bg);
    border: 1px solid var(--border-glass);
    position: relative;
}

.testi-card i.quote {
    position: absolute;
    top: 2rem;
    right: 2rem;
    font-size: 3rem;
    opacity: 0.1;
}

.testi-user {
    display: flex;
    align-items: center;
    gap: 1.2rem;
    margin-top: 2rem;
}

.testi-user img {
    width: 55px;
    height: 55px;
    border-radius: 50%;
    border: 2px solid var(--primary);
}

/* Partner Logos */
.partners {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 5rem;
    opacity: 0.4;
    filter: grayscale(1);
    transition: var(--transition);
}

.partners:hover {
    opacity: 1;
    filter: grayscale(0);
}

.partners i {
    font-size: 3.5rem;
}

/* App CTA Section */
.app-section {
    max-width: var(--container-max);
    margin: 4rem auto;
    width: 90%;
}

.app-cta {
    background: linear-gradient(135deg, #4f46e5, #9333ea);
    border-radius: 48px;
    padding: 5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    overflow: hidden;
    position: relative;
    color: white;
}

.app-cta::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 500px;
    height: 500px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
}

.app-cta-content {
    max-width: 550px;
    position: relative;
    z-index: 2;
}

.app-mockup {
    width: 350px;
    transform: rotate(-10deg) translateY(60px);
    position: relative;
    z-index: 2;
    filter: drop-shadow(0 30px 60px rgba(0,0,0,0.5));
}

/* --- Common Components --- */
.btn {
    padding: 1rem 2rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 10px 20px -5px var(--primary-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 20px 30px -10px var(--primary-glow);
}

.btn-outline {
    border: 1px solid var(--border-glass);
    color: var(--text-main);
    background: transparent;
}

.btn-outline:hover {
    background: var(--border-glass);
}

/* --- AI Assistant --- */
.ai-widget {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 2000;
}

.ai-toggle {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 10px 25px rgba(0,0,0,0.3);
    transition: var(--transition);
}

.ai-toggle img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
}

.ai-panel {
    position: absolute;
    bottom: 90px;
    right: 0;
    width: 350px;
    height: 500px;
    background: var(--bg-dark);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
}

.ai-widget.open .ai-panel {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.ai-header {
    padding: 1.5rem;
    background: rgba(255,255,255,0.05);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.ai-chat {
    flex: 1;
    padding: 1.5rem;
    overflow-y: auto;
}

.ai-msg {
    margin-bottom: 1rem;
    padding: 0.8rem 1.2rem;
    border-radius: 18px;
    font-size: 0.9rem;
    max-width: 85%;
}

.ai-msg.bot {
    background: var(--glass-bg);
    border: 1px solid var(--border-glass);
    align-self: flex-start;
}

.ai-input {
    padding: 1rem;
    display: flex;
    gap: 0.5rem;
    background: rgba(0,0,0,0.2);
}

.ai-input input {
    flex: 1;
    background: transparent;
    border: 1px solid var(--border-glass);
    padding: 0.6rem 1rem;
    border-radius: 100px;
    color: white;
    outline: none;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
    .nav-links { display: none; }
    .hero h1 { font-size: 3.5rem; }
    .app-cta { flex-direction: column; text-align: center; padding: 3rem; }
    .app-mockup { width: 250px; transform: rotate(0) translateY(30px); }
    .path-card { flex-direction: column; text-align: center; }
}