/* 
   LinguaLearn - Main Stylesheet
   Online Language Course Platform
*/

/* ---------- Reset & Base Styles ---------- */
:root {
    --primary-color: #4a6bdf;
    --primary-dark: #3951b0;
    --secondary-color: #ff7846;
    --accent-color: #39d2c0;
    --text-dark: #333333;
    --text-light: #777777;
    --light-bg: #f8f9fa;
    --border-color: #e9ecef;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --white: #ffffff;
    --black: #000000;
    --box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--white);
}

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

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

a:hover {
    color: var(--primary-dark);
}

ul {
    list-style: none;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 40px;
    position: relative;
    padding-bottom: 15px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background-color: var(--primary-color);
}

section {
    padding: 80px 0;
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 5px;
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

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

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

.btn-secondary {
    background-color: var(--secondary-color);
    color: var(--white);
}

.btn-secondary:hover {
    background-color: #e05a2c;
    color: var(--white);
}

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

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

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

/* ---------- Header ---------- */
header {
    background-color: var(--white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
}

.logo h1 {
    color: var(--primary-color);
    font-size: 1.8rem;
    font-weight: 700;
}

.logo a {
    text-decoration: none;
}

.logo a:hover h1 {
    color: var(--primary-dark);
}

nav ul {
    display: flex;
    gap: 25px;
}

nav ul li a {
    color: var(--text-dark);
    font-weight: 500;
    position: relative;
}

nav ul li a:hover,
nav ul li a.active {
    color: var(--primary-color);
}

nav ul li a.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--primary-color);
}

.auth-buttons {
    display: flex;
    gap: 15px;
}

/* User Dropdown Styles */
.user-dropdown {
    position: relative;
}

.dropdown-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

.dropdown-toggle i {
    font-size: 1.1rem;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background-color: var(--white);
    min-width: 180px;
    border-radius: 5px;
    box-shadow: var(--box-shadow);
    padding: 10px 0;
    margin-top: 10px;
    display: none;
    z-index: 100;
}

.dropdown-menu.show {
    display: block;
}

.dropdown-menu a {
    display: block;
    padding: 10px 20px;
    color: var(--text-dark);
    transition: var(--transition);
}

.dropdown-menu a:hover {
    background-color: var(--light-bg);
    color: var(--primary-color);
}

.dropdown-menu a:not(:last-child) {
    border-bottom: 1px solid var(--border-color);
}

/* ---------- Hero Section ---------- */
.hero {
    background-color: var(--light-bg);
    padding: 100px 0;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    color: var(--text-dark);
    line-height: 1.2;
}

.hero-content p {
    font-size: 1.2rem;
    color: var(--text-light);
    margin-bottom: 30px;
}

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

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature-card {
    background-color: var(--white);
    padding: 30px;
    border-radius: 10px;
    box-shadow: var(--box-shadow);
    text-align: center;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-10px);
}

.feature-icon {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 70px;
    height: 70px;
    border-radius: 50%;
    background-color: rgba(74, 107, 223, 0.1);
    margin-bottom: 20px;
}

.feature-icon i {
    font-size: 30px;
    color: var(--primary-color);
}

.feature-card h3 {
    margin-bottom: 15px;
    font-size: 1.4rem;
}

.feature-card p {
    color: var(--text-light);
}

/* ---------- Courses Section ---------- */
.popular-courses {
    background-color: var(--light-bg);
}

.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.course-card {
    background-color: var(--white);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.course-card:hover {
    transform: translateY(-10px);
}

.course-image {
    position: relative;
    height: 200px;
    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-level {
    position: absolute;
    top: 15px;
    right: 15px;
    background-color: var(--primary-color);
    color: var(--white);
    padding: 5px 10px;
    border-radius: 5px;
    font-size: 0.8rem;
    font-weight: 600;
}

.course-content {
    padding: 25px;
}

.course-content h3 {
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.course-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 15px;
    color: var(--text-light);
    font-size: 0.9rem;
}

.course-info span {
    display: flex;
    align-items: center;
    gap: 5px;
}

.course-content p {
    margin-bottom: 20px;
    color: var(--text-light);
}

.courses-cta {
    text-align: center;
}

/* ---------- Testimonials Section ---------- */
.testimonials {
    background-color: var(--white);
}

.testimonial-slider {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.testimonial {
    background-color: var(--light-bg);
    padding: 30px;
    border-radius: 10px;
    box-shadow: var(--box-shadow);
}

.testimonial-content {
    margin-bottom: 20px;
    font-style: italic;
    color: var(--text-dark);
    position: relative;
}

.testimonial-content::before {
    content: '\201C';
    font-size: 60px;
    color: var(--primary-color);
    opacity: 0.2;
    position: absolute;
    top: -20px;
    left: -10px;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 15px;
}

.testimonial-author img {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    object-fit: cover;
}

.testimonial-author h4 {
    margin-bottom: 5px;
    font-size: 1.1rem;
}

.testimonial-author p {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* ---------- CTA Section ---------- */
.cta {
    background-color: var(--primary-color);
    color: var(--white);
    text-align: center;
    padding: 60px 0;
}

.cta-content h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.cta-content p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

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

.cta .btn-primary:hover {
    background-color: var(--light-bg);
}

/* ---------- Footer ---------- */
footer {
    background-color: #2c3e50;
    color: var(--white);
    padding: 70px 0 20px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 50px;
}

.footer-about p {
    margin-bottom: 20px;
    opacity: 0.8;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-links a {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--white);
    transition: var(--transition);
}

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

.footer-links h3, .footer-contact h3 {
    margin-bottom: 20px;
    font-size: 1.3rem;
}

.footer-links ul li {
    margin-bottom: 12px;
}

.footer-links ul li a {
    color: var(--white);
    opacity: 0.8;
    transition: var(--transition);
}

.footer-links ul li a:hover {
    opacity: 1;
    padding-left: 5px;
    color: var(--primary-color);
}

.footer-contact p {
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
    opacity: 0.8;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    opacity: 0.6;
}

.footer-legal a {
    color: var(--white);
    opacity: 0.6;
    margin-left: 20px;
    transition: var(--transition);
}

.footer-legal a:hover {
    opacity: 1;
}

/* ---------- Responsive Styles ---------- */
@media (max-width: 992px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-image {
        grid-row: 1;
    }
    
    .hero-content {
        grid-row: 2;
    }
    
    .hero-content h1 {
        font-size: 2.5rem;
    }
}

@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        gap: 20px;
    }
    
    nav ul {
        gap: 15px;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .course-grid, .testimonial-slider {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .footer-legal a {
        margin: 0 10px;
    }
}

@media (max-width: 576px) {
    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

/* ---------- Courses Page ---------- */
.courses-header {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 60px 0;
    text-align: center;
}

.courses-header h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.courses-header p {
    max-width: 700px;
    margin: 0 auto;
    font-size: 1.1rem;
    opacity: 0.9;
}

.courses-filter {
    background-color: var(--white);
    padding: 20px;
    border-radius: 10px;
    box-shadow: var(--box-shadow);
    margin-top: -30px;
    margin-bottom: 50px;
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    align-items: center;
    justify-content: center;
}

.filter-item {
    display: flex;
    align-items: center;
    gap: 10px;
}

.filter-item select {
    padding: 8px 15px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    color: var(--text-dark);
}

.courses-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 50px;
}

.pagination {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 40px;
}

.pagination a {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    border-radius: 5px;
    border: 1px solid var(--border-color);
    color: var(--text-dark);
    font-weight: 500;
    transition: var(--transition);
}

.pagination a:hover, .pagination a.active {
    background-color: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
}

/* ---------- Course Details Page ---------- */
.course-details {
    padding: 80px 0;
}

.course-details-container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 40px;
}

.course-content-details h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.course-meta {
    display: flex;
    gap: 20px;
    margin-bottom: 30px;
}

.course-meta-item {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-light);
}

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

.course-image-large {
    margin-bottom: 30px;
    border-radius: 10px;
    overflow: hidden;
}

.course-description {
    margin-bottom: 40px;
}

.course-description h2 {
    margin-bottom: 20px;
    font-size: 1.5rem;
}

.course-description p {
    margin-bottom: 15px;
    color: var(--text-light);
}

.course-curriculum h2 {
    margin-bottom: 20px;
    font-size: 1.5rem;
}

.curriculum-item {
    padding: 15px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    margin-bottom: 15px;
    cursor: pointer;
}

.curriculum-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.curriculum-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 500;
}

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

.course-sidebar {
    position: sticky;
    top: 120px;
}

.course-sidebar-card {
    background-color: var(--white);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--box-shadow);
}

.course-price {
    padding: 30px;
    text-align: center;
    background-color: var(--primary-color);
    color: var(--white);
}

.course-price h2 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.course-price p {
    opacity: 0.9;
    margin-bottom: 20px;
}

.course-includes {
    padding: 30px;
}

.course-includes h3 {
    margin-bottom: 20px;
    font-size: 1.3rem;
}

.includes-item {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
}

.includes-item i {
    color: var(--success-color);
}

.instructor-card {
    margin-top: 30px;
    padding: 30px;
    border-radius: 10px;
    box-shadow: var(--box-shadow);
    background-color: var(--white);
}

.instructor-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 20px;
}

.instructor-header img {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    object-fit: cover;
}

.instructor-info h3 {
    margin-bottom: 5px;
    font-size: 1.3rem;
}

.instructor-info p {
    color: var(--text-light);
}

.instructor-bio {
    color: var(--text-light);
}

/* Responsive for course details */
@media (max-width: 992px) {
    .course-details-container {
        grid-template-columns: 1fr;
    }
    
    .course-sidebar {
        position: static;
    }
}