/* ==========================================================================
   Cursos Moz - Design System & Custom Styles
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --primary-light: #eef2ff;
    --secondary: #10b981;
    --secondary-hover: #059669;
    --accent: #f59e0b;
    --dark-bg: #0f172a;
    --dark-surface: #1e293b;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --text-light: #f8fafc;
    --border-color: #e2e8f0;
    --card-shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.08);
    --hover-shadow: 0 20px 40px -10px rgba(79, 70, 229, 0.2);
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-full: 9999px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --mpesa-color: #e60000;
    --emola-color: #f26522;
}

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

body {
    font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: #f8fafc;
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Container */
.container {
    max-width: 1240px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header & Navbar */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(226, 232, 240, 0.8);
    transition: var(--transition);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--dark-bg);
}

.logo-badge {
    background: linear-gradient(135deg, var(--primary) 0%, #818cf8 100%);
    color: white;
    width: 42px;
    height: 42px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

.logo-text span {
    color: var(--primary);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-main);
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--primary);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.btn-contact {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: #25d366;
    color: white;
    padding: 10px 20px;
    border-radius: var(--radius-full);
    font-weight: 700;
    font-size: 0.9rem;
    text-decoration: none;
    transition: var(--transition);
    box-shadow: 0 4px 14px rgba(37, 211, 102, 0.25);
}

.btn-contact:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37, 211, 102, 0.35);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 60%, #312e81 100%);
    color: white;
    padding: 90px 0 110px 0;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -20%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.25) 0%, rgba(0,0,0,0) 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 48px;
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 8px 18px;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 600;
    color: #a5b4fc;
    margin-bottom: 24px;
    backdrop-filter: blur(8px);
}

.hero-badge-dot {
    width: 8px;
    height: 8px;
    background-color: var(--secondary);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--secondary);
}

.hero-title {
    font-size: 3.2rem;
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.hero-title .highlight {
    background: linear-gradient(135deg, #818cf8 0%, #34d399 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: #cbd5e1;
    margin-bottom: 36px;
    max-width: 580px;
}

.hero-stats {
    display: flex;
    gap: 36px;
    margin-top: 40px;
    padding-top: 32px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.stat-item h4 {
    font-size: 1.8rem;
    font-weight: 800;
    color: white;
}

.stat-item p {
    font-size: 0.85rem;
    color: #94a3b8;
}

.hero-card-preview {
    background: rgba(255, 255, 255, 0.07);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-lg);
    padding: 32px;
    backdrop-filter: blur(12px);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.hero-payment-methods {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.payment-pill-group {
    display: flex;
    gap: 12px;
    margin-top: 12px;
    flex-wrap: wrap;
}

.pay-pill {
    padding: 10px 18px;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 8px;
}

.pay-pill.mpesa {
    background: #e60000;
    color: white;
}

.pay-pill.emola {
    background: #f26522;
    color: white;
}

.pay-pill.card {
    background: #2563eb;
    color: white;
}

/* Category Filter Bar */
.catalog-section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-tag {
    color: var(--primary);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-size: 0.85rem;
    margin-bottom: 12px;
    display: block;
}

.section-title {
    font-size: 2.3rem;
    font-weight: 800;
    color: var(--dark-bg);
    margin-bottom: 16px;
}

.filter-bar {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 40px;
}

.filter-btn {
    background: white;
    border: 1px solid var(--border-color);
    padding: 12px 24px;
    border-radius: var(--radius-full);
    font-family: inherit;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition);
}

.filter-btn:hover, .filter-btn.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    box-shadow: 0 6px 16px rgba(79, 70, 229, 0.25);
}

/* Courses Grid */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 32px;
}

.course-card {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
    box-shadow: var(--card-shadow);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    cursor: pointer;
    position: relative;
}

.course-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--hover-shadow);
    border-color: #c7d2fe;
}

.course-img-wrapper {
    position: relative;
    height: 210px;
    overflow: hidden;
}

.course-img-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.course-card:hover .course-img-wrapper img {
    transform: scale(1.06);
}

.course-badge {
    position: absolute;
    top: 16px;
    left: 16px;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(8px);
    color: white;
    padding: 6px 14px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 700;
}

.course-category-tag {
    position: absolute;
    bottom: 16px;
    right: 16px;
    background: var(--primary);
    color: white;
    padding: 4px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 700;
}

.course-body {
    padding: 24px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.course-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.course-rating {
    display: flex;
    align-items: center;
    gap: 4px;
    color: var(--accent);
    font-weight: 700;
}

.course-card-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--dark-bg);
    margin-bottom: 10px;
    line-height: 1.35;
}

.course-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 20px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.course-footer {
    margin-top: auto;
    padding-top: 18px;
    border-top: 1px solid #f1f5f9;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.price-box {
    display: flex;
    flex-direction: column;
}

.original-price {
    font-size: 0.8rem;
    text-decoration: line-through;
    color: #94a3b8;
}

.current-price {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--primary);
}

.btn-view-course {
    background: var(--primary-light);
    color: var(--primary);
    border: none;
    padding: 10px 18px;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-weight: 700;
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition);
}

.course-card:hover .btn-view-course {
    background: var(--primary);
    color: white;
}

/* Why Choose Us Section */
.features-section {
    background: white;
    padding: 80px 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 32px;
}

.feature-card {
    padding: 32px;
    border-radius: var(--radius-lg);
    background: #f8fafc;
    border: 1px solid #f1f5f9;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-4px);
    background: white;
    box-shadow: var(--card-shadow);
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    margin-bottom: 20px;
}

.feature-title {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--dark-bg);
}

.feature-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* Modals */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 23, 42, 0.75);
    backdrop-filter: blur(8px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: white;
    width: 100%;
    max-width: 850px;
    max-height: 90vh;
    border-radius: var(--radius-lg);
    overflow-y: auto;
    position: relative;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    transform: scale(0.95);
    transition: transform 0.3s ease;
}

.modal-overlay.active .modal-content {
    transform: scale(1);
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 20px;
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid var(--border-color);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    cursor: pointer;
    z-index: 10;
    transition: var(--transition);
}

.modal-close:hover {
    background: #f1f5f9;
    transform: rotate(90deg);
}

/* Course Detail Content */
.detail-hero {
    position: relative;
    height: 280px;
    color: white;
}

.detail-hero img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.detail-hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(0deg, rgba(15, 23, 42, 0.9) 0%, rgba(15, 23, 42, 0.4) 100%);
    padding: 32px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
}

.detail-body {
    padding: 32px;
}

.detail-grid {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 32px;
}

.detail-section-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin: 24px 0 12px 0;
    color: var(--dark-bg);
}

.learn-list {
    list-style: none;
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;

}

.learn-list li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 0.95rem;
    color: var(--text-main);
}

.learn-list li::before {
    content: "✓";
    background: var(--secondary);
    color: white;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 800;
    flex-shrink: 0;
    margin-top: 2px;
}

.modules-accordion {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 16px;
}

.module-card {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 16px;
    background: #f8fafc;
}

.module-title {
    font-weight: 700;
    font-size: 0.95rem;
    margin-bottom: 8px;
    color: var(--dark-bg);
}

.module-lessons {
    list-style: none;
    padding-left: 12px;
}

.module-lessons li {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 4px;
    position: relative;
}

.module-lessons li::before {
    content: "•";
    color: var(--primary);
    font-weight: bold;
    margin-right: 6px;
}

/* Sidebar Checkout Box */
.checkout-box-card {
    background: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 24px;
    position: sticky;
    top: 20px;
}

.price-tag-large {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--primary);
    display: flex;
    align-items: baseline;
    gap: 8px;
}

.price-tag-large span {
    font-size: 1rem;
    color: #94a3b8;
    text-decoration: line-through;
    font-weight: 500;
}

.btn-primary-block {
    width: 100%;
    background: linear-gradient(135deg, var(--primary) 0%, #4338ca 100%);
    color: white;
    border: none;
    padding: 16px;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-weight: 800;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 20px;
    box-shadow: 0 8px 20px rgba(79, 70, 229, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-primary-block:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 25px rgba(79, 70, 229, 0.4);
}

/* Payment Modal Specifics */
.payment-methods-tabs {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin: 20px 0;
}

.pay-tab {
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 14px 8px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 700;
    font-size: 0.9rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}

.pay-tab.active {
    border-color: var(--primary);
    background: var(--primary-light);
    color: var(--primary);
}

.pay-tab.mpesa.active {
    border-color: var(--mpesa-color);
    background: #fef2f2;
    color: var(--mpesa-color);
}

.pay-tab.emola.active {
    border-color: var(--emola-color);
    background: #fff7ed;
    color: var(--emola-color);
}

.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    font-weight: 700;
    font-size: 0.85rem;
    margin-bottom: 6px;
    color: var(--dark-bg);
}

.form-control {
    width: 100%;
    padding: 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 0.95rem;
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

/* Footer */
footer {
    background: var(--dark-bg);
    color: #94a3b8;
    padding: 60px 0 30px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand h3 {
    color: white;
    font-size: 1.4rem;
    margin-bottom: 12px;
}

.footer-links h4 {
    color: white;
    font-size: 1rem;
    margin-bottom: 16px;
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: #94a3b8;
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
}

.footer-links a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    font-size: 0.85rem;
}

/* ==========================================================================
   Responsive & Mobile Optimization (< 900px, < 768px, < 480px)
   ========================================================================== */

@media (max-width: 900px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 36px;
    }
    .detail-grid {
        grid-template-columns: 1fr;
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }
    .hero-title {
        font-size: 2.4rem;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }

    /* Navbar Mobile */
    .nav-container {
        height: auto;
        padding: 14px 0;
        flex-wrap: wrap;
    }

    .logo {
        font-size: 1.3rem;
    }

    .logo-badge {
        width: 36px;
        height: 36px;
        font-size: 1.1rem;
    }

    .nav-links {
        order: 3;
        width: 100%;
        display: flex;
        gap: 16px;
        overflow-x: auto;
        white-space: nowrap;
        padding: 10px 0 4px 0;
        border-top: 1px solid #f1f5f9;
        -webkit-overflow-scrolling: touch;
    }

    .nav-links li {
        flex-shrink: 0;
    }

    .nav-links a {
        font-size: 0.85rem;
    }

    .btn-contact {
        padding: 8px 14px;
        font-size: 0.8rem;
    }

    /* Hero Section Mobile */
    .hero {
        padding: 40px 0 50px 0;
    }

    .hero-title {
        font-size: 1.85rem;
        line-height: 1.25;
        margin-bottom: 16px;
    }

    .hero-subtitle {
        font-size: 0.95rem;
        margin-bottom: 24px;
    }

    .hero-badge {
        font-size: 0.78rem;
        padding: 6px 14px;
        margin-bottom: 16px;
    }

    .hero-stats {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 12px;
        margin-top: 24px;
        padding-top: 20px;
    }

    .stat-item h4 {
        font-size: 1.3rem;
    }

    .stat-item p {
        font-size: 0.75rem;
    }

    .hero-card-preview {
        padding: 20px;
    }

    .payment-pill-group {
        gap: 8px;
    }

    .pay-pill {
        padding: 8px 12px;
        font-size: 0.78rem;
    }

    /* Catalog & Filter Bar Mobile */
    .catalog-section {
        padding: 48px 0;
    }

    .section-header {
        margin-bottom: 28px;
    }

    .section-title {
        font-size: 1.6rem;
    }

    .filter-bar {
        display: flex;
        flex-wrap: nowrap;
        overflow-x: auto;
        justify-content: flex-start;
        padding-bottom: 8px;
        margin-bottom: 24px;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
    }

    .filter-bar::-webkit-scrollbar {
        display: none;
    }

    .filter-btn {
        flex-shrink: 0;
        padding: 8px 16px;
        font-size: 0.85rem;
    }

    /* Courses Grid Mobile */
    .courses-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .course-img-wrapper {
        height: 180px;
    }

    .course-body {
        padding: 18px;
    }

    .course-card-title {
        font-size: 1.1rem;
    }

    .current-price {
        font-size: 1.25rem;
    }

    /* Features Section Mobile */
    .features-section {
        padding: 48px 0;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .feature-card {
        padding: 20px;
    }

    /* Modals Mobile */
    .modal-overlay {
        padding: 10px;
        align-items: flex-end;
    }

    .modal-content {
        max-height: 92vh;
        border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    }

    .modal-close {
        top: 12px;
        right: 12px;
        width: 34px;
        height: 34px;
        font-size: 1rem;
    }

    .detail-hero {
        height: 190px;
    }

    .detail-hero-overlay {
        padding: 16px;
    }

    .detail-hero-overlay h2 {
        font-size: 1.25rem !important;
    }

    .detail-body {
        padding: 18px;
    }

    .detail-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .checkout-box-card {
        position: static;
        padding: 18px;
    }

    .price-tag-large {
        font-size: 1.8rem;
    }

    .payment-methods-tabs {
        grid-template-columns: repeat(3, 1fr);
        gap: 6px;
    }

    .pay-tab {
        padding: 10px 4px;
        font-size: 0.78rem;
    }

    /* Footer Mobile */
    footer {
        padding: 40px 0 24px 0;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.6rem;
    }

    .hero-stats {
        grid-template-columns: 1fr 1fr;
    }

    .payment-methods-tabs {
        grid-template-columns: 1fr;
    }

    .pay-tab {
        flex-direction: row;
        justify-content: center;
        padding: 12px;
    }
}