/* Landing Page Styles */

:root {
    /* Light Mode Variables (default) */
    --bg-color: #f8fafc;
    --bg-gradient: linear-gradient(135deg, #f8fafc 0%, #e9f2ff 100%);
    --text-color: #334155;
    --heading-color: #1e293b;
    --card-bg: #ffffff;
    --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --border-color: #e2e8f0;
    --input-bg: #ffffff;
    --input-border: #cbd5e1;
    --button-primary-bg: #4a6cf7;
    --button-primary-hover: #3a5ce5;
    --button-primary-text: #ffffff;
    --button-secondary-bg: #f1f5f9;
    --button-secondary-text: #334155;
    --discount-banner-bg: #4a6cf7;
    --discount-banner-text: #ffffff;
    --header-bg: rgba(255, 255, 255, 0.95);
    --header-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    --footer-bg: #1e293b;
    --footer-text: #e2e8f0;
    --footer-link: #cbd5e1;
    --footer-link-hover: #ffffff;
    --pricing-popular-bg: #4a6cf7;
    --pricing-popular-text: #ffffff;
    --course-badge-bg: #4a6cf7;
    --course-badge-text: #ffffff;
    --scrollbar-track: #f1f5f9;
    --scrollbar-thumb: #cbd5e1;
}

/* Dark Mode Class */
body.dark-mode {
    --bg-color: #0f172a;
    --bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    --text-color: #e2e8f0;
    --heading-color: #f8fafc;
    --card-bg: #1e293b;
    --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    --border-color: #334155;
    --input-bg: #334155;
    --input-border: #475569;
    --button-primary-bg: #4a6cf7;
    --button-primary-hover: #3a5ce5;
    --button-primary-text: #ffffff;
    --button-secondary-bg: #334155;
    --button-secondary-text: #e2e8f0;
    --discount-banner-bg: #3a5ce5;
    --discount-banner-text: #ffffff;
    --header-bg: rgba(15, 23, 42, 0.95);
    --header-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    --footer-bg: #0f172a;
    --footer-text: #e2e8f0;
    --footer-link: #cbd5e1;
    --footer-link-hover: #ffffff;
    --pricing-popular-bg: #3a5ce5;
    --pricing-popular-text: #ffffff;
    --course-badge-bg: #3a5ce5;
    --course-badge-text: #ffffff;
    --scrollbar-track: #1e293b;
    --scrollbar-thumb: #475569;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    background-image: var(--bg-gradient);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
}

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

a {
    text-decoration: none;
    color: var(--button-primary-bg);
    transition: color 0.3s ease;
}

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

ul {
    list-style: none;
}

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

section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 15px;
    color: var(--heading-color);
}

.section-header p {
    font-size: 1.1rem;
    max-width: 700px;
    margin: 0 auto;
    color: var(--text-color);
    opacity: 0.8;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-primary {
    background-color: var(--button-primary-bg);
    color: var(--button-primary-text);
    border: none;
}

.btn-primary:hover {
    background-color: var(--button-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(74, 108, 247, 0.25);
}

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

.btn-outline:hover {
    background-color: var(--button-primary-bg);
    color: var(--button-primary-text);
    transform: translateY(-2px);
}

.btn-lg {
    padding: 14px 28px;
    font-size: 1.1rem;
}

.btn-block {
    display: block;
    width: 100%;
}

/* Discount Banner */
.discount-banner {
    background-color: var(--discount-banner-bg);
    color: var(--discount-banner-text);
    padding: 10px 0;
    text-align: center;
    position: relative;
}

.discount-banner .container {
    display: flex;
    justify-content: center;
    align-items: center;
}

.discount-banner p {
    font-size: 0.95rem;
}

.promo-code {
    background-color: rgba(255, 255, 255, 0.2);
    padding: 3px 8px;
    border-radius: 4px;
    margin: 0 5px;
    font-weight: 600;
}

.banner-close {
    background: none;
    border: none;
    color: var(--discount-banner-text);
    opacity: 0.7;
    cursor: pointer;
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    transition: opacity 0.3s ease;
}

.banner-close:hover {
    opacity: 1;
}

/* Header & Navigation */
.site-header {
    background-color: var(--header-bg);
    box-shadow: var(--header-shadow);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

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

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

.logo img {
    width: 40px;
    height: 40px;
}

.logo span {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--heading-color);
}

.main-nav ul {
    display: flex;
    gap: 30px;
}

.main-nav a {
    color: var(--text-color);
    font-weight: 500;
    position: relative;
    padding: 5px 0;
}

.main-nav a:hover,
.main-nav a.active {
    color: var(--button-primary-bg);
}

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

.nav-buttons {
    display: flex;
    align-items: center;
    gap: 15px;
}

.theme-toggle {
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    font-size: 1.2rem;
    padding: 5px;
    transition: color 0.3s ease;
}

.theme-toggle:hover {
    color: var(--button-primary-bg);
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 1.5rem;
    cursor: pointer;
}

/* Hero Section */
.hero {
    padding: 100px 0;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100%;
    height: 100%;
    background-image: url('../images/hero-pattern.svg');
    background-repeat: no-repeat;
    background-position: right top;
    background-size: 50%;
    opacity: 0.1;
    z-index: -1;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.hero-content h1 {
    font-size: 3.5rem;
    line-height: 1.2;
    margin-bottom: 20px;
    color: var(--heading-color);
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 15px;
    margin-bottom: 40px;
}

.hero-stats {
    display: flex;
    gap: 40px;
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--button-primary-bg);
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.8;
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-image img {
    max-width: 100%;
    animation: float 6s ease-in-out infinite;
}

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

/* Mission Section */
.mission {
    background-color: var(--card-bg);
    padding: 100px 0;
}

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

.mission-card {
    background-color: var(--bg-color);
    border-radius: 10px;
    padding: 30px;
    text-align: center;
    box-shadow: var(--card-shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.mission-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.card-icon {
    width: 70px;
    height: 70px;
    background-color: var(--button-primary-bg);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 1.8rem;
}

.mission-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--heading-color);
}

.mission-card p {
    opacity: 0.8;
}

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

/* Courses Section */
.courses {
    padding: 100px 0;
}

.course-filters {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 40px;
}

.filter-btn {
    padding: 8px 16px;
    background-color: var(--button-secondary-bg);
    color: var(--button-secondary-text);
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.filter-btn.active,
.filter-btn:hover {
    background-color: var(--button-primary-bg);
    color: var(--button-primary-text);
}

.course-carousel {
    width: 100%;
    padding-bottom: 50px;
}

.course-card {
    background-color: var(--card-bg);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--card-shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    height: auto;
}

.course-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.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-badge {
    position: absolute;
    top: 15px;
    right: 15px;
    background-color: var(--course-badge-bg);
    color: var(--course-badge-text);
    padding: 5px 10px;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
}

.course-content {
    padding: 20px;
}

.course-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 15px;
    font-size: 0.85rem;
    opacity: 0.8;
}

.course-level,
.course-duration {
    display: flex;
    align-items: center;
    gap: 5px;
}

.course-content h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
    color: var(--heading-color);
}

.course-content p {
    font-size: 0.95rem;
    margin-bottom: 20px;
    opacity: 0.8;
}

.course-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-color);
    padding-top: 15px;
}

.course-rating {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 0.85rem;
}

.course-rating i {
    color: #f59e0b;
}

.course-price {
    font-weight: 700;
    color: var(--button-primary-bg);
}

.courses-cta {
    text-align: center;
    margin-top: 50px;
}

/* Swiper Customization */
.swiper-button-next,
.swiper-button-prev {
    color: var(--button-primary-bg);
}

.swiper-pagination-bullet {
    background-color: var(--button-primary-bg);
}

/* Pricing Section */
.pricing {
    background-color: var(--card-bg);
    padding: 100px 0;
}

.pricing-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 50px;
}

.switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 30px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--button-secondary-bg);
    transition: 0.4s;
}

.slider:before {
    position: absolute;
    content: "";
    height: 22px;
    width: 22px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: 0.4s;
}

input:checked + .slider {
    background-color: var(--button-primary-bg);
}

input:checked + .slider:before {
    transform: translateX(30px);
}

.slider.round {
    border-radius: 34px;
}

.slider.round:before {
    border-radius: 50%;
}

.save-badge {
    background-color: var(--button-primary-bg);
    color: white;
    padding: 3px 8px;
    border-radius: 20px;
    font-size: 0.8rem;
    margin-left: 5px;
}

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

.pricing-card {
    background-color: var(--bg-color);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--card-shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
}

.pricing-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.pricing-card.popular {
    border: 2px solid var(--pricing-popular-bg);
    transform: scale(1.05);
}

.pricing-card.popular:hover {
    transform: scale(1.05) translateY(-10px);
}

.popular-badge {
    position: absolute;
    top: 0;
    right: 0;
    background-color: var(--pricing-popular-bg);
    color: var(--pricing-popular-text);
    padding: 8px 15px;
    font-size: 0.8rem;
    font-weight: 600;
    border-radius: 0 10px 0 10px;
}

.pricing-header {
    padding: 30px;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.pricing-header h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--heading-color);
}

.pricing-price {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.pricing-price.annual {
    display: none;
}

.price {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--button-primary-bg);
}

.period {
    font-size: 0.9rem;
    opacity: 0.7;
}

.pricing-features {
    padding: 30px;
}

.pricing-features ul {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.pricing-features li {
    display: flex;
    align-items: center;
    gap: 10px;
}

.pricing-features li i {
    color: var(--button-primary-bg);
    font-size: 1rem;
}

.pricing-features li.disabled {
    opacity: 0.5;
}

.pricing-features li.disabled i {
    color: #ef4444;
}

.pricing-footer {
    padding: 0 30px 30px;
}

/* Footer */
.site-footer {
    background-color: var(--footer-bg);
    color: var(--footer-text);
    padding: 80px 0 30px;
}

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

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
}

.footer-logo img {
    width: 40px;
    height: 40px;
}

.footer-logo span {
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
}

.footer-column p {
    margin-bottom: 20px;
    opacity: 0.8;
    font-size: 0.95rem;
}

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

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
    border-radius: 50%;
    transition: all 0.3s ease;
}

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

.footer-column h4 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    color: white;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    color: var(--footer-link);
    transition: all 0.3s ease;
}

.footer-links a:hover {
    color: var(--footer-link-hover);
    transform: translateX(5px);
}

.app-buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 20px;
}

.app-button img {
    height: 40px;
}

.newsletter-text {
    margin-bottom: 10px;
}

.newsletter-form {
    display: flex;
    gap: 10px;
}

.newsletter-form input {
    flex: 1;
    padding: 10px 15px;
    border-radius: 5px;
    border: none;
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
}

.newsletter-form input::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

.newsletter-form button {
    background-color: var(--button-primary-bg);
    color: white;
    border: none;
    border-radius: 5px;
    padding: 10px 15px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.newsletter-form button:hover {
    background-color: var(--button-primary-hover);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.9rem;
}

.footer-bottom p {
    opacity: 0.7;
}

.footer-bottom-links {
    display: flex;
    gap: 20px;
}

.footer-bottom-links a {
    color: var(--footer-link);
    opacity: 0.7;
    transition: opacity 0.3s ease;
}

.footer-bottom-links a:hover {
    opacity: 1;
    color: var(--footer-link-hover);
}

/* Back to Top Button */
#back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--button-primary-bg);
    color: white;
    border: none;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 99;
}

#back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

#back-to-top:hover {
    background-color: var(--button-primary-hover);
    transform: translateY(-5px);
}

/* Responsive Styles */
@media (max-width: 1024px) {
    .hero-content h1 {
        font-size: 2.8rem;
    }
    
    .pricing-cards {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .pricing-card.popular {
        grid-column: span 2;
        margin-bottom: 30px;
    }
}

@media (max-width: 768px) {
    section {
        padding: 60px 0;
    }
    
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-content {
        order: 2;
    }
    
    .hero-image {
        order: 1;
        margin-bottom: 30px;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .main-nav {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .pricing-cards {
        grid-template-columns: 1fr;
    }
    
    .pricing-card.popular {
        grid-column: auto;
        transform: scale(1);
    }
    
    .pricing-card.popular:hover {
        transform: translateY(-10px);
    }
    
    .footer-top {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 2.2rem;
    }
    
    .section-header h2 {
        font-size: 2rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 20px;
        align-items: center;
    }
    
    .course-filters {
        flex-direction: column;
        align-items: center;
    }
    
    .filter-btn {
        width: 100%;
        text-align: center;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .footer-bottom-links {
        justify-content: center;
    }
}