/* 
   AuraAcademy - Premium Online Course Styling
   Design System: Deep Indigo, Royal Violet, and Emerald Mint Accent
*/

:root {
    --primary-color: #1e1b4b; /* Deep Indigo 900 */
    --primary-light: #312e81; /* Deep Indigo 800 */
    --accent-color: #4f46e5; /* Royal Violet 600 */
    --accent-hover: #4338ca; /* Royal Violet 700 */
    --mint-color: #10b981; /* Emerald Mint */
    --mint-hover: #059669; /* Dark Emerald */
    --text-color: #334155; /* Slate 700 */
    --text-light: #64748b; /* Slate 500 */
    --bg-color: #f8fafc; /* Slate 50 */
    --bg-card: #ffffff;
    --border-color: #e2e8f0;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font-main: 'Prompt', sans-serif;
    --font-eng: 'Inter', sans-serif;
    --shadow: 0 10px 30px -10px rgba(30, 27, 75, 0.08);
    --shadow-hover: 0 20px 45px -15px rgba(30, 27, 75, 0.15);
    --shadow-accent: 0 10px 30px -10px rgba(79, 70, 229, 0.3);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-main);
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.6;
    overflow-x: hidden;
}

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

button, input, select, textarea {
    font-family: inherit;
    outline: none;
}

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

/* Header & Navigation */
.course-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(30, 27, 75, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    color: #ffffff;
    transition: var(--transition);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    font-family: var(--font-eng);
    display: flex;
    align-items: center;
    gap: 8px;
    color: #ffffff;
}

.logo i {
    color: var(--mint-color);
}

.accent-text {
    color: var(--mint-color);
}

.nav-links {
    display: flex;
    gap: 16px;
}

.nav-link {
    font-size: 0.875rem;
    font-weight: 500;
    color: #cbd5e1;
    position: relative;
    padding: 6px 0;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--mint-color);
    transition: var(--transition);
}

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 20px;
}

.lang-switch {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #cbd5e1;
    padding: 6px 12px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.8rem;
    font-weight: 600;
    display: flex;
    gap: 5px;
    transition: var(--transition);
}

.lang-switch:hover {
    border-color: var(--mint-color);
    color: #ffffff;
}

.active-lang {
    color: var(--mint-color);
}

/* Mobile Toggle */
.mobile-toggle {
    display: none;
    background: transparent;
    border: none;
    color: #ffffff;
    font-size: 1.5rem;
    cursor: pointer;
}

/* Mobile Drawer */
.mobile-menu {
    position: fixed;
    top: 0;
    right: -300px;
    width: 300px;
    height: 100vh;
    background-color: var(--primary-color);
    z-index: 1100;
    padding: 40px 30px;
    display: flex;
    flex-direction: column;
    gap: 30px;
    transition: right 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: -10px 0 30px rgba(0, 0, 0, 0.3);
}

.mobile-menu.open {
    right: 0;
}

.close-menu {
    align-self: flex-end;
    background: transparent;
    border: none;
    color: #cbd5e1;
    font-size: 1.5rem;
    cursor: pointer;
}

.mobile-nav-links {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.mobile-link {
    font-size: 1.1rem;
    font-weight: 500;
    color: #cbd5e1;
}

.mobile-link:hover {
    color: var(--mint-color);
}

.mobile-lang-switch {
    align-self: flex-start;
    margin-bottom: 10px;
}

.menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1050;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
}

.menu-overlay.open {
    opacity: 1;
    pointer-events: auto;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-weight: 600;
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 0.85rem;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 1rem;
    border-radius: 6px;
}

.btn-full-width {
    width: 100%;
    padding: 12px;
    font-size: 1rem;
}

.btn-accent {
    background-color: var(--accent-color);
    color: #ffffff;
}

.btn-accent:hover {
    background-color: var(--accent-hover);
    box-shadow: var(--shadow-accent);
}

.btn-outline-white {
    background: transparent;
    border: 2px solid #ffffff;
    color: #ffffff;
}

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

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

.btn-outline-accent:hover {
    background-color: var(--accent-color);
    color: #ffffff;
}

.pulse-button {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(79, 70, 229, 0.5);
    }
    70% {
        box-shadow: 0 0 0 10px rgba(79, 70, 229, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(79, 70, 229, 0);
    }
}

/* Sections Base */
section {
    padding: 100px 0;
    position: relative;
}

.section-title {
    margin-bottom: 50px;
}

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

.sub-title {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--mint-color);
    display: inline-block;
    margin-bottom: 10px;
    border-bottom: 2px solid var(--mint-color);
    padding-bottom: 5px;
}

.section-title h2 {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-top: 10px;
}

/* Hero Section */
.hero-section {
    min-height: 90vh;
    display: flex;
    align-items: center;
    padding-top: 140px;
    padding-bottom: 80px;
    background-color: var(--primary-color);
    color: #ffffff;
    overflow: hidden;
    position: relative;
}

.hero-bg-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at top right, rgba(79, 70, 229, 0.15) 0%, rgba(30, 27, 75, 0) 60%);
    z-index: 1;
}

.hero-container {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 50px;
    align-items: center;
}

.hero-tag {
    display: inline-block;
    padding: 6px 14px;
    background-color: rgba(16, 185, 129, 0.12);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: var(--mint-color);
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: 4px;
    margin-bottom: 25px;
}

.hero-content h1 {
    font-size: 3.25rem;
    line-height: 1.25;
    font-weight: 700;
    margin-bottom: 25px;
}

.hero-content p {
    font-size: 1.1rem;
    color: #cbd5e1;
    margin-bottom: 40px;
    font-weight: 300;
}

.hero-actions {
    display: flex;
    gap: 16px;
}

.hero-visual {
    display: flex;
    justify-content: center;
    position: relative;
}

.visual-wrapper {
    position: relative;
    border-radius: 12px;
    padding: 6px;
    background: linear-gradient(135deg, rgba(255,255,255,0.06) 0%, rgba(255,255,255,0.02) 100%);
    border: 1px solid rgba(255, 255, 255, 0.15);
    box-shadow: 0 30px 60px -15px rgba(0, 0, 0, 0.4);
}

.visual-img {
    border-radius: 8px;
    width: 100%;
    height: auto;
    object-fit: cover;
    display: block;
}

/* Highlights Section */
.highlights-section {
    background-color: #ffffff;
}

.highlights-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.highlight-card {
    background-color: var(--bg-color);
    padding: 40px 30px;
    border-radius: 8px;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.highlight-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
    border-color: var(--accent-color);
}

.icon-box {
    width: 60px;
    height: 60px;
    background-color: rgba(79, 70, 229, 0.08);
    color: var(--accent-color);
    font-size: 1.75rem;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 25px;
}

.highlight-card h3 {
    font-size: 1.3rem;
    color: var(--primary-color);
    margin-bottom: 15px;
    font-weight: 700;
}

.highlight-card p {
    color: var(--text-light);
    font-size: 0.95rem;
}

/* Curriculum Section (Accordion) */
.curriculum-section {
    background-color: var(--bg-color);
}

.curriculum-accordion {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.accordion-item {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.accordion-header {
    padding: 24px 30px;
    display: flex;
    align-items: center;
    cursor: pointer;
    gap: 20px;
    user-select: none;
}

.chapter-num {
    font-family: var(--font-eng);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--accent-color);
    background-color: rgba(79, 70, 229, 0.08);
    width: 45px;
    height: 45px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.accordion-header h3 {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--primary-color);
    flex-grow: 1;
}

.toggle-icon {
    font-size: 1.1rem;
    color: var(--text-light);
    transition: transform 0.3s ease;
}

.accordion-item.active {
    border-color: var(--accent-color);
}

.accordion-item.active .toggle-icon {
    transform: rotate(180deg);
    color: var(--accent-color);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    background-color: rgba(248, 250, 252, 0.5);
    border-top: 0px solid var(--border-color);
}

.accordion-item.active .accordion-content {
    border-top: 1px solid var(--border-color);
}

.lesson-list {
    list-style: none;
    padding: 24px 30px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.lesson-list li {
    font-size: 0.95rem;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 12px;
}

.lesson-list li i {
    color: var(--accent-color);
    font-size: 1rem;
}

/* Instructor Section */
.instructor-section {
    background-color: #ffffff;
}

.instructor-grid {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 60px;
    align-items: center;
}

.instructor-visual {
    display: flex;
    justify-content: center;
}

.instructor-img {
    width: 100%;
    max-width: 380px;
    border-radius: 16px;
    box-shadow: var(--shadow-hover);
    object-fit: cover;
    aspect-ratio: 1;
}

.instructor-info h3 {
    font-size: 1.5rem;
    color: var(--accent-color);
    margin-bottom: 20px;
}

.instructor-info p {
    color: var(--text-light);
    font-size: 1.05rem;
    margin-bottom: 30px;
}

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

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

.stat-number {
    font-family: var(--font-eng);
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-top: 4px;
}

.border-left {
    border-left: 1px solid var(--border-color);
    padding-left: 40px;
}

/* Pricing Section */
.pricing-section {
    background-color: var(--bg-color);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
    max-width: 900px;
    margin: 0 auto;
    align-items: stretch;
}

.price-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 50px 40px;
    display: flex;
    flex-direction: column;
    position: relative;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

.price-card.popular {
    border-color: var(--accent-color);
    background: radial-gradient(ellipse at top right, rgba(79, 70, 229, 0.06) 0%, var(--bg-card) 60%);
    box-shadow: var(--shadow-hover), 0 0 30px rgba(79, 70, 229, 0.1);
}

.card-badge {
    position: absolute;
    top: -15px;
    right: 40px;
    background: linear-gradient(135deg, var(--mint-color) 0%, var(--accent-color) 100%);
    color: white;
    padding: 6px 16px;
    border-radius: 99px;
    font-size: 0.85rem;
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
}

.price-card h3 {
    font-size: 1.35rem;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.price-amount {
    font-family: var(--font-eng);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 20px;
    display: flex;
    align-items: baseline;
    gap: 6px;
}

.price-period {
    font-family: var(--font-main);
    font-size: 0.95rem;
    color: var(--text-light);
    font-weight: 400;
}

.price-desc {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 35px;
    min-height: 54px;
}

.price-features {
    list-style: none;
    margin-bottom: 40px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    flex-grow: 1; /* Pushes button to bottom */
}

.price-features li {
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 12px;
}

.price-features li i.fa-check {
    color: var(--mint-color);
}

.price-features li.disabled {
    color: var(--text-light);
    opacity: 0.5;
    text-decoration: line-through;
}

.price-features li i.fa-xmark {
    color: var(--text-light);
}

.price-card .btn {
    margin-top: auto;
}

/* Reviews Section */
.reviews-section {
    background-color: #ffffff;
}

.reviews-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
}

.review-card {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 40px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.review-card:hover {
    border-color: var(--accent-color);
}

.review-stars {
    color: #f59e0b; /* Amber 500 */
    font-size: 1rem;
    margin-bottom: 20px;
    display: flex;
    gap: 4px;
}

.review-card p {
    font-size: 1.05rem;
    line-height: 1.7;
    color: var(--text-color);
    font-style: italic;
    margin-bottom: 25px;
}

.review-user {
    display: flex;
    align-items: center;
    gap: 16px;
}

.user-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background-color: rgba(79, 70, 229, 0.08);
    color: var(--accent-color);
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.user-info h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary-color);
}

.user-info span {
    font-size: 0.8rem;
    color: var(--text-light);
}

/* Register Form Section */
.register-section {
    background-color: var(--bg-color);
}

.register-container {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 50px;
    max-width: 750px;
    margin: 0 auto;
    box-shadow: var(--shadow);
}

.register-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-label {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--primary-color);
}

.input-field {
    background-color: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 12px 14px;
    font-size: 0.95rem;
    width: 100%;
    transition: var(--transition);
    color: var(--text-color);
}

.input-field:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

/* Footer Styling */
.course-footer {
    background-color: var(--primary-color);
    color: rgba(255,255,255,0.7);
    padding: 40px 0;
    border-top: 1px solid rgba(255,255,255,0.05);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
}

.footer-socials {
    display: flex;
    gap: 20px;
    font-size: 1.2rem;
}

.footer-socials a:hover {
    color: var(--mint-color);
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background-color: var(--accent-color);
    color: white;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 99;
}

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

.back-to-top:hover {
    background-color: var(--mint-color);
    transform: translateY(-3px);
}

/* Modal Checkout Success Overlay */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(30, 27, 75, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 2000;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal-overlay.open {
    opacity: 1;
    pointer-events: auto;
}

.modal-card {
    background-color: #ffffff;
    border-radius: 16px;
    width: 100%;
    max-width: 550px;
    overflow: hidden;
    box-shadow: 0 30px 70px rgba(0,0,0,0.3);
    transform: scale(0.9);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.modal-overlay.open .modal-card {
    transform: scale(1);
}

.modal-image-wrapper {
    width: 100%;
    aspect-ratio: 16/10;
    overflow: hidden;
    background-color: var(--primary-color);
}

.modal-img-top {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.modal-body {
    padding: 35px;
    text-align: center;
}

.modal-body h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.modal-body p {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 30px;
}

/* Responsive Media Queries */
@media (max-width: 1024px) {
    .nav-links, .nav-actions .btn {
        display: none;
    }
    .mobile-toggle {
        display: block;
    }
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-visual {
        order: -1;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .instructor-grid {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }
    
    .instructor-visual {
        order: -1;
    }
    
    .instructor-stats {
        justify-content: center;
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
    }
    
    .reviews-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    
    .highlights-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .register-container {
        padding: 30px 20px;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
}