/* ===========================
   CSS Variables & Reset
   =========================== */
:root {
    /* Primary Colors - Educational Blue/Green Theme */
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    --secondary-color: #10b981;
    --secondary-dark: #059669;
    --secondary-light: #34d399;
    
    /* Neutral Colors */
    --dark: #1e293b;
    --dark-gray: #334155;
    --gray: #64748b;
    --light-gray: #e2e8f0;
    --lighter-gray: #f1f5f9;
    --white: #ffffff;
    
    /* Accent Colors */
    --accent-orange: #f59e0b;
    --accent-red: #ef4444;
    --accent-purple: #8b5cf6;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Poppins', sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background-color: var(--white);
    overflow-x: hidden;
}

/* ===========================
   Typography
   =========================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 { font-size: 3rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: 1rem;
    color: var(--gray);
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-normal);
}

ul {
    list-style: none;
}

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

/* ===========================
   Container & Layout
   =========================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

section {
    padding: 5rem 0;
}

/* ===========================
   Buttons
   =========================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius-md);
    font-family: 'Poppins', sans-serif;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-normal);
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: var(--white);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-course {
    background: var(--secondary-color);
    color: var(--white);
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
}

.btn-course:hover {
    background: var(--secondary-dark);
    transform: translateY(-2px);
}

/* ===========================
   Navigation Bar
   =========================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--white);
    box-shadow: var(--shadow-md);
    z-index: 1000;
    padding: 1rem 0;
}

.nav-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.logo i {
    font-size: 2rem;
}

.nav-menu {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    color: var(--dark);
    font-weight: 500;
    position: relative;
    transition: var(--transition-normal);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 3px;
    background: var(--primary-color);
    transition: var(--transition-normal);
}

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

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-buttons {
    display: flex;
    gap: 1rem;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--dark);
    transition: var(--transition-normal);
}

/* ===========================
   Hero Section
   =========================== */
.hero {
    margin-top: 80px;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    padding: 5rem 0;
    overflow: hidden;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    color: var(--dark);
}

.highlight {
    color: var(--primary-color);
    position: relative;
}

.hero-description {
    font-size: 1.25rem;
    color: var(--gray);
    margin-bottom: 2rem;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 3rem;
}

.hero-stats {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.stat-item i {
    font-size: 2.5rem;
    color: var(--primary-color);
}

.stat-item h3 {
    font-size: 1.75rem;
    color: var(--dark);
    margin-bottom: 0;
}

.stat-item p {
    font-size: 0.875rem;
    color: var(--gray);
    margin-bottom: 0;
}

.hero-image-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 500px;
}

.hero-icon {
    font-size: 15rem;
    color: var(--primary-color);
    opacity: 0.1;
    animation: float 6s ease-in-out infinite;
}

.floating-card {
    position: absolute;
    background: var(--white);
    padding: 1rem 1.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    animation: float 3s ease-in-out infinite;
}

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

.floating-card p {
    font-weight: 600;
    margin: 0;
    white-space: nowrap;
}

.card-1 {
    top: 10%;
    right: 10%;
    animation-delay: 0s;
}

.card-2 {
    bottom: 20%;
    left: 5%;
    animation-delay: 1s;
}

.card-3 {
    top: 50%;
    right: 5%;
    animation-delay: 2s;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

/* ===========================
   Section Headers
   =========================== */
.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title {
    color: var(--dark);
    margin-bottom: 1rem;
}

.section-description {
    font-size: 1.125rem;
    color: var(--gray);
    max-width: 600px;
    margin: 0 auto;
}

.section-cta {
    text-align: center;
    margin-top: 3rem;
}

/* ===========================
   Courses Section
   =========================== */
.courses {
    background: var(--white);
}

.course-categories {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 3rem;
}

.category-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--lighter-gray);
    border: 2px solid transparent;
    border-radius: var(--radius-full);
    font-family: 'Poppins', sans-serif;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--dark);
    cursor: pointer;
    transition: var(--transition-normal);
}

.category-btn:hover {
    background: var(--light-gray);
    transform: translateY(-2px);
}

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

.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
}

.course-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: var(--transition-normal);
}

.course-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.course-image {
    position: relative;
    height: 200px;
    background: linear-gradient(135deg, var(--primary-light), var(--secondary-light));
    display: flex;
    align-items: center;
    justify-content: center;
}

.course-icon {
    font-size: 5rem;
    color: var(--white);
    opacity: 0.3;
}

.course-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--accent-orange);
    color: var(--white);
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.badge-new {
    background: var(--secondary-color);
}

.course-content {
    padding: 1.5rem;
}

.course-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.course-category {
    font-size: 0.875rem;
    color: var(--primary-color);
    font-weight: 500;
}

.course-rating {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--accent-orange);
}

.course-title {
    font-size: 1.25rem;
    color: var(--dark);
    margin-bottom: 0.75rem;
}

.course-description {
    font-size: 0.95rem;
    color: var(--gray);
    margin-bottom: 1.25rem;
    line-height: 1.6;
}

.course-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    border-top: 1px solid var(--light-gray);
}

.course-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.course-info span {
    font-size: 0.8rem;
    color: var(--gray);
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.course-info i {
    color: var(--primary-color);
}

/* ===========================
   About Section
   =========================== */
.about {
    background: var(--lighter-gray);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-paragraph {
    font-size: 1.05rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.about-features {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    margin-top: 2rem;
}

.about-feature {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.about-feature i {
    font-size: 1.5rem;
    color: var(--secondary-color);
    margin-top: 0.25rem;
}

.about-feature h4 {
    font-size: 1.125rem;
    color: var(--dark);
    margin-bottom: 0.25rem;
}

.about-feature p {
    font-size: 0.95rem;
    margin-bottom: 0;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.stat-box {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    text-align: center;
    transition: var(--transition-normal);
}

.stat-box:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.stat-box i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.stat-number {
    font-size: 2.5rem;
    color: var(--dark);
    margin-bottom: 0.5rem;
}

.stat-box p {
    font-size: 1rem;
    color: var(--gray);
    margin-bottom: 0;
}

/* ===========================
   Features Section
   =========================== */
.features {
    background: var(--white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--lighter-gray);
    padding: 2rem;
    border-radius: var(--radius-xl);
    text-align: center;
    transition: var(--transition-normal);
    border: 2px solid transparent;
}

.feature-card:hover {
    background: var(--white);
    border-color: var(--primary-color);
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-normal);
}

.feature-card:hover .feature-icon {
    transform: scale(1.1) rotate(5deg);
}

.feature-icon i {
    font-size: 2.5rem;
    color: var(--white);
}

.feature-title {
    font-size: 1.25rem;
    color: var(--dark);
    margin-bottom: 1rem;
}

.feature-description {
    font-size: 0.95rem;
    color: var(--gray);
    line-height: 1.7;
}

/* ===========================
   Contact Section
   =========================== */
.contact {
    background: var(--lighter-gray);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 3rem;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.contact-card {
    background: var(--white);
    padding: 1.75rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
}

.contact-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.contact-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
}

.contact-icon i {
    font-size: 1.75rem;
    color: var(--white);
}

.contact-card h3 {
    font-size: 1.25rem;
    color: var(--dark);
    margin-bottom: 0.75rem;
}

.contact-card p {
    font-size: 0.95rem;
    line-height: 1.8;
    margin-bottom: 0;
}

.contact-social h3 {
    font-size: 1.25rem;
    color: var(--dark);
    margin-bottom: 1rem;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-link {
    width: 50px;
    height: 50px;
    background: var(--white);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
}

.social-link:hover {
    background: var(--primary-color);
    color: var(--white);
    transform: translateY(-5px);
}

.social-link i {
    font-size: 1.25rem;
}

.contact-form-wrapper {
    background: var(--white);
    padding: 2.5rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 500;
    color: var(--dark);
    font-size: 0.95rem;
}

.form-group input,
.form-group textarea {
    padding: 0.875rem;
    border: 2px solid var(--light-gray);
    border-radius: var(--radius-md);
    font-family: 'Poppins', sans-serif;
    font-size: 1rem;
    transition: var(--transition-normal);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-message {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    display: none;
}

.form-message.success {
    display: block;
    background: #d1fae5;
    color: #065f46;
}

.form-message.error {
    display: block;
    background: #fee2e2;
    color: #991b1b;
}

/* ===========================
   Footer
   =========================== */
.footer {
    background: var(--dark);
    color: var(--light-gray);
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 1rem;
}

.footer-logo i {
    font-size: 2rem;
    color: var(--primary-light);
}

.footer-description {
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.footer-social {
    display: flex;
    gap: 1rem;
}

.footer-social-link {
    width: 45px;
    height: 45px;
    background: var(--dark-gray);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-normal);
}

.footer-social-link:hover {
    background: var(--primary-color);
    color: var(--white);
    transform: translateY(-3px);
}

.footer-title {
    font-size: 1.25rem;
    color: var(--white);
    margin-bottom: 1.5rem;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-links a {
    color: var(--light-gray);
    font-size: 0.95rem;
    transition: var(--transition-normal);
}

.footer-links a:hover {
    color: var(--primary-light);
    padding-left: 0.5rem;
}

.footer-newsletter-text {
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

.footer-newsletter {
    display: flex;
    gap: 0.5rem;
}

.footer-newsletter input {
    flex: 1;
    padding: 0.75rem;
    border: 2px solid var(--dark-gray);
    border-radius: var(--radius-md);
    background: var(--dark-gray);
    color: var(--white);
    font-family: 'Poppins', sans-serif;
}

.footer-newsletter input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.footer-newsletter button {
    padding: 0.75rem 1.25rem;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--dark-gray);
}

.footer-bottom p {
    font-size: 0.95rem;
    color: var(--gray);
    margin-bottom: 0;
}

.footer-bottom i {
    color: var(--accent-red);
}

/* ===========================
   Scroll to Top Button
   =========================== */
.scroll-top {
    position: fixed;
    z-index: 99999;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: var(--white);
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    transition: var(--transition-normal);
}
.scroll-top.flex {
    display: flex;
}

.scroll-top:hover {
    background: var(--primary-dark);
    transform: translateY(-5px);
}

.scroll-top.show {
    display: flex;
}

/* ===========================
   Responsive Design
   =========================== */
@media (max-width: 1024px) {
    .container {
        padding: 0 1.5rem;
    }
    
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
    
    .hero-content,
    .about-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .hero-title {
        font-size: 2.75rem;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu,
    .nav-buttons {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 2rem;
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: var(--transition-normal);
    }
    
    .nav-menu.active,
    .nav-buttons.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }
    
    .hamburger {
        display: flex;
    }
    
    .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(7px, -7px);
    }
    
    .hero {
        padding: 3rem 0;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .hero-stats {
        flex-direction: column;
    }
    
    .hero-image-wrapper {
        height: 300px;
    }
    
    .hero-icon {
        font-size: 10rem;
    }
    
    .course-grid {
        grid-template-columns: 1fr;
    }
    
    .about-stats {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    section {
        padding: 3rem 0;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
    
    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.5rem; }
    
    .hero-title {
        font-size: 1.75rem;
    }
    
    .btn-lg {
        padding: 0.875rem 1.5rem;
        font-size: 1rem;
    }
    
    .category-btn {
        font-size: 0.85rem;
        padding: 0.625rem 1.25rem;
    }
    
    .course-card {
        border-radius: var(--radius-lg);
    }
    
    .stat-item {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}