/* ==========================================

   EDUAI - MODERN EDUCATION PLATFORM

   ========================================== */



:root {

    --primary: #5852fe;

    --primary-dark: #4641d9;

    --secondary: #2dca8c;

    --accent: #ff6b6b;

    --dark: #0f1629;

    --gray-dark: #1a1f36;

    --gray: #6b7280;

    --gray-light: #e5e7eb;

    --white: #ffffff;

    --gradient: linear-gradient(135deg, #5852fe 0%, #2dca8c 100%);

}



/* ==========================================

   GLOBAL RESET

   ========================================== */

* {

    margin: 0;

    padding: 0;

    box-sizing: border-box;

}



html {

    scroll-behavior: smooth;

}



body {

    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    font-size: 16px;

    line-height: 1.6;

    color: var(--dark);

    background: var(--white);

    overflow-x: hidden;

}



img {

    max-width: 100%;

    height: auto;

    display: block;

}



a {

    text-decoration: none;

    color: inherit;

    transition: all 0.3s ease;

}



ul {

    list-style: none;

}



.container {

    max-width: 1200px;

    margin: 0 auto;

    padding: 0 20px;

}



/* ==========================================

   HEADER & NAVIGATION

   ========================================== */

.header {

    position: fixed;

    top: 0;

    left: 0;

    right: 0;

    background: var(--white);

    box-shadow: 0 2px 20px rgba(0,0,0,0.08);

    z-index: 1000;

    transition: all 0.3s ease;

}



.header.scrolled {

    box-shadow: 0 4px 30px rgba(0,0,0,0.15);

}



.header-inner {

    display: flex;

    align-items: center;

    justify-content: space-between;

    padding: 20px 0;

}



.logo {

    font-size: 28px;

    font-weight: 800;

    background: var(--gradient);

    -webkit-background-clip: text;

    -webkit-text-fill-color: transparent;

    background-clip: text;

}



.nav-desktop {

    display: flex;

    gap: 40px;

}



.nav-desktop a {

    font-weight: 600;

    color: var(--dark);

    position: relative;

}



.nav-desktop a::after {

    content: '';

    position: absolute;

    bottom: -5px;

    left: 0;

    width: 0;

    height: 2px;

    background: var(--primary);

    transition: width 0.3s ease;

}



.nav-desktop a:hover::after,

.nav-desktop a.active::after {

    width: 100%;

}



.header-actions {

    display: flex;

    align-items: center;

    gap: 20px;

}



.btn {

    padding: 12px 30px;

    border-radius: 50px;

    font-weight: 600;

    font-size: 15px;

    cursor: pointer;

    border: none;

    transition: all 0.3s ease;

    display: inline-flex;

    align-items: center;

    gap: 8px;

}



.btn-primary {

    background: var(--gradient);

    color: var(--white);

    box-shadow: 0 10px 30px rgba(88, 82, 254, 0.3);

}



.btn-primary:hover {

    transform: translateY(-2px);

    box-shadow: 0 15px 40px rgba(88, 82, 254, 0.4);

}



.btn-outline {

    background: transparent;

    border: 2px solid var(--primary);

    color: var(--primary);

}



.btn-outline:hover {

    background: var(--primary);

    color: var(--white);

}



/* Hamburger Menu */

.hamburger {

    display: none;

    flex-direction: column;

    gap: 5px;

    cursor: pointer;

    padding: 10px;

    z-index: 1001;

}



.hamburger span {

    width: 28px;

    height: 3px;

    background: var(--dark);

    border-radius: 3px;

    transition: all 0.3s ease;

}



.hamburger.active span:nth-child(1) {

    transform: rotate(45deg) translate(8px, 8px);

}



.hamburger.active span:nth-child(2) {

    opacity: 0;

}



.hamburger.active span:nth-child(3) {

    transform: rotate(-45deg) translate(8px, -8px);

}



.nav-mobile {

    position: fixed;

    top: 0;

    right: -100%;

    width: 300px;

    height: 100vh;

    background: var(--white);

    box-shadow: -10px 0 50px rgba(0,0,0,0.2);

    padding: 100px 40px 40px;

    transition: right 0.4s ease;

    z-index: 999;

    overflow-y: auto;

}



.nav-mobile.active {

    right: 0;

}



.nav-mobile a {

    display: block;

    padding: 15px 0;

    font-weight: 600;

    font-size: 18px;

    color: var(--dark);

    border-bottom: 1px solid var(--gray-light);

}



.nav-mobile a:hover {

    color: var(--primary);

}



.mobile-overlay {

    position: fixed;

    inset: 0;

    background: rgba(0,0,0,0.5);

    opacity: 0;

    pointer-events: none;

    transition: opacity 0.3s ease;

    z-index: 998;

}



.mobile-overlay.active {

    opacity: 1;

    pointer-events: auto;

}



/* ==========================================

   HERO SECTION

   ========================================== */

.hero {

    min-height: 100vh;

    display: flex;

    align-items: center;

    background: linear-gradient(135deg, #f5f7fa 0%, #e8ecf4 100%);

    padding-top: 80px;

    position: relative;

    overflow: hidden;

}



.hero::before {

    content: '';

    position: absolute;

    top: -50%;

    right: -10%;

    width: 600px;

    height: 600px;

    background: var(--gradient);

    opacity: 0.1;

    border-radius: 50%;

    filter: blur(100px);

}



.hero-content {

    display: grid;

    grid-template-columns: 1fr 1fr;

    gap: 60px;

    align-items: center;

}



.hero-text h1 {

    font-size: 56px;

    font-weight: 900;

    line-height: 1.2;

    margin-bottom: 20px;

    color: var(--dark);

}



.hero-text h1 span {

    background: var(--gradient);

    -webkit-background-clip: text;

    -webkit-text-fill-color: transparent;

    background-clip: text;

}



.hero-text p {

    font-size: 18px;

    color: var(--gray);

    margin-bottom: 30px;

    line-height: 1.8;

}



.hero-actions {

    display: flex;

    gap: 20px;

    flex-wrap: wrap;

}



.hero-image {

    position: relative;

}



.hero-image img {

    width: 100%;

    border-radius: 20px;

    box-shadow: 0 30px 60px rgba(0,0,0,0.15);

}



.hero-stats {

    display: flex;

    gap: 40px;

    margin-top: 50px;

}



.stat-item {

    text-align: center;

}



.stat-number {

    font-size: 36px;

    font-weight: 900;

    background: var(--gradient);

    -webkit-background-clip: text;

    -webkit-text-fill-color: transparent;

    background-clip: text;

}



.stat-label {

    font-size: 14px;

    color: var(--gray);

    margin-top: 5px;

}



/* ==========================================

   CATEGORIES

   ========================================== */

.categories {

    padding: 100px 0;

}



.section-header {

    text-align: center;

    margin-bottom: 60px;

}



.section-title {

    font-size: 42px;

    font-weight: 900;

    margin-bottom: 15px;

    color: var(--dark);

}



.section-subtitle {

    font-size: 18px;

    color: var(--gray);

}



.categories-grid {

    display: grid;

    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));

    gap: 30px;

}



.category-card {

    background: var(--white);

    border: 2px solid var(--gray-light);

    border-radius: 20px;

    padding: 40px 30px;

    text-align: center;

    transition: all 0.3s ease;

    cursor: pointer;

}



.category-card:hover {

    border-color: var(--primary);

    transform: translateY(-10px);

    box-shadow: 0 20px 40px rgba(88, 82, 254, 0.15);

}



.category-icon {

    width: 80px;

    height: 80px;

    margin: 0 auto 20px;

    background: var(--gradient);

    border-radius: 20px;

    display: flex;

    align-items: center;

    justify-content: center;

    font-size: 36px;

}



.category-card h3 {

    font-size: 20px;

    font-weight: 700;

    margin-bottom: 10px;

}



.category-card p {

    font-size: 14px;

    color: var(--gray);

}



/* ==========================================

   COURSES / EXERCISES

   ========================================== */

.courses {

    padding: 100px 0;

    background: linear-gradient(135deg, #f5f7fa 0%, #e8ecf4 100%);

}



.courses-grid {

    display: grid;

    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));

    gap: 30px;

}



.course-card {

    background: var(--white);

    border-radius: 20px;

    overflow: hidden;

    box-shadow: 0 10px 30px rgba(0,0,0,0.08);

    transition: all 0.3s ease;

}



.course-card:hover {

    transform: translateY(-10px);

    box-shadow: 0 20px 50px rgba(0,0,0,0.15);

}



.course-image {

    position: relative;

    height: 220px;

    overflow: hidden;

}



.course-image img {

    width: 100%;

    height: 100%;

    object-fit: cover;

    transition: transform 0.5s ease;

}



.course-card:hover .course-image img {

    transform: scale(1.1);

}



.course-badge {

    position: absolute;

    top: 15px;

    left: 15px;

    background: var(--secondary);

    color: var(--white);

    padding: 6px 15px;

    border-radius: 50px;

    font-size: 12px;

    font-weight: 700;

}



.course-content {

    padding: 25px;

}



.course-meta {

    display: flex;

    align-items: center;

    gap: 15px;

    margin-bottom: 15px;

    font-size: 14px;

    color: var(--gray);

}



.course-meta span {

    display: flex;

    align-items: center;

    gap: 5px;

}



.course-title {

    font-size: 20px;

    font-weight: 700;

    margin-bottom: 10px;

    color: var(--dark);

}



.course-description {

    font-size: 14px;

    color: var(--gray);

    margin-bottom: 20px;

    line-height: 1.6;

}



.course-footer {

    display: flex;

    justify-content: space-between;

    align-items: center;

    padding-top: 20px;

    border-top: 1px solid var(--gray-light);

}



.course-difficulty {

    display: flex;

    align-items: center;

    gap: 5px;

    font-size: 14px;

    font-weight: 600;

    color: var(--primary);

}



/* ==========================================

   STATS SECTION

   ========================================== */

.stats {

    padding: 80px 0;

    background: var(--gradient);

    color: var(--white);

}



.stats-grid {

    display: grid;

    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));

    gap: 40px;

    text-align: center;

}



.stats .stat-number {

    color: var(--white);

    -webkit-text-fill-color: var(--white);

}



.stats .stat-label {

    color: rgba(255, 255, 255, 0.9);

    font-size: 16px;

}



/* ==========================================

   CTA SECTION

   ========================================== */

.cta {

    padding: 100px 0;

    background: linear-gradient(135deg, #f5f7fa 0%, #e8ecf4 100%);

}



.cta-content {

    background: var(--gradient);

    border-radius: 30px;

    padding: 80px 60px;

    text-align: center;

    color: var(--white);

    position: relative;

    overflow: hidden;

}



.cta-content::before {

    content: '';

    position: absolute;

    top: -50%;

    right: -20%;

    width: 400px;

    height: 400px;

    background: rgba(255, 255, 255, 0.1);

    border-radius: 50%;

}



.cta-content h2 {

    font-size: 42px;

    font-weight: 900;

    margin-bottom: 20px;

}



.cta-content p {

    font-size: 18px;

    margin-bottom: 30px;

    opacity: 0.95;

}



.btn-white {

    background: var(--white);

    color: var(--primary);

}



.btn-white:hover {

    transform: translateY(-3px);

    box-shadow: 0 15px 40px rgba(255, 255, 255, 0.3);

}



/* ==========================================

   FOOTER

   ========================================== */

.footer {

    background: var(--dark);

    color: var(--white);

    padding: 80px 0 30px;

}



.footer-content {

    display: grid;

    grid-template-columns: 2fr 1fr 1fr 1fr;

    gap: 60px;

    margin-bottom: 50px;

}



.footer-about h3 {

    font-size: 28px;

    margin-bottom: 20px;

    background: var(--gradient);

    -webkit-background-clip: text;

    -webkit-text-fill-color: transparent;

    background-clip: text;

}



.footer-about p {

    color: var(--gray);

    line-height: 1.8;

    margin-bottom: 20px;

}



.footer-section h4 {

    font-size: 18px;

    margin-bottom: 20px;

}



.footer-section ul li {

    margin-bottom: 12px;

}



.footer-section a {

    color: var(--gray);

}



.footer-section a:hover {

    color: var(--primary);

}



.footer-bottom {

    text-align: center;

    padding-top: 30px;

    border-top: 1px solid rgba(255, 255, 255, 0.1);

    color: var(--gray);

}



/* ==========================================

   RESPONSIVE

   ========================================== */

@media (max-width: 1024px) {

    .hero-content {

        gap: 40px;

    }

    

    .hero-text h1 {

        font-size: 42px;

    }

    

    .footer-content {

        grid-template-columns: 1fr 1fr;

        gap: 40px;

    }

}



@media (max-width: 768px) {

    .nav-desktop,

    .header-actions {

        display: none !important;

    }

    

    .hamburger {

        display: flex;

    }

    

    .hero {

        min-height: auto;

        padding: 120px 0 60px;

    }

    

    .hero-content {

        grid-template-columns: 1fr;

        gap: 40px;

    }

    

    .hero-text h1 {

        font-size: 36px;

    }

    

    .hero-text p {

        font-size: 16px;

    }

    

    .hero-actions {

        flex-direction: column;

    }

    

    .hero-actions .btn {

        width: 100%;

        justify-content: center;

    }

    

    .hero-stats {

        flex-wrap: wrap;

        gap: 20px;

    }

    

    .section-title {

        font-size: 32px;

    }

    

    .categories-grid {

        grid-template-columns: 1fr;

    }

    

    .courses-grid {

        grid-template-columns: 1fr;

    }

    

    .stats-grid {

        grid-template-columns: repeat(2, 1fr);

        gap: 30px;

    }

    

    .cta-content {

        padding: 50px 30px;

    }

    

    .cta-content h2 {

        font-size: 28px;

    }

    

    .cta-content p {

        font-size: 16px;

    }

    

    .footer-content {

        grid-template-columns: 1fr;

        gap: 40px;

    }

}



@media (max-width: 480px) {

    .header-inner {

        padding: 15px 0;

    }

    

    .logo {

        font-size: 24px;

    }

    

    .hero-text h1 {

        font-size: 28px;

    }

    

    .section-title {

        font-size: 26px;

    }

    

    .stat-number {

        font-size: 28px;

    }

    

    .cta-content h2 {

        font-size: 24px;

    }

}