/* =========================================================
   বাংলা অনলাইন কোর্স প্ল্যাটফর্ম (Bidyabati) - Master Stylesheet
   Pure CSS3, Mobile-First, Touch-Friendly, Responsive Architecture
   ========================================================= */

:root {
    --color-primary: #0d9488;
    --color-primary-hover: #0f766e;
    --color-primary-light: #f0fdfa;
    --color-secondary: #0f172a;
    --color-accent: #f59e0b;
    --color-bg: #f8fafc;
    --color-surface: #ffffff;
    --color-text: #0f172a;
    --color-text-muted: #64748b;
    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    --color-info: #3b82f6;

    --font-main: 'Hind Siliguri', 'Noto Sans Bengali', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --container-max: 1200px;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-full: 9999px;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
}

/* Reset & Box Sizing */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-main);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

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

a {
    color: inherit;
    text-decoration: none;
    transition: color 0.2s ease;
}

button, input, select, textarea {
    font: inherit;
    color: inherit;
}

ul, ol {
    list-style: none;
}

/* Layout Containers */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin-left: auto;
    margin-right: auto;
    padding-left: 1.25rem;
    padding-right: 1.25rem;
}

.site-main {
    flex: 1 0 auto;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    color: var(--color-secondary);
    font-weight: 700;
    line-height: 1.3;
}

h1 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.1rem; }

p {
    margin-bottom: 0.75rem;
}
p:last-child {
    margin-bottom: 0;
}

.text-muted { color: var(--color-text-muted); }
.text-primary { color: var(--color-primary); }
.text-danger { color: var(--color-danger); }
.text-success { color: var(--color-success); }
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.65rem 1.25rem;
    min-height: 44px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.2s ease;
    text-align: center;
}

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

.btn-secondary {
    background-color: var(--color-secondary);
    color: #ffffff;
}
.btn-secondary:hover {
    background-color: #1e293b;
    color: #ffffff;
}

.btn-outline {
    background-color: transparent;
    border-color: var(--color-border);
    color: var(--color-secondary);
}
.btn-outline:hover {
    background-color: var(--color-surface);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.btn-sm {
    padding: 0.4rem 0.85rem;
    min-height: 38px;
    font-size: 0.875rem;
    border-radius: var(--radius-sm);
}

.btn-lg {
    padding: 0.85rem 1.75rem;
    font-size: 1.05rem;
    min-height: 48px;
}

.btn-block {
    width: 100%;
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.25rem 0.65rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    line-height: 1.2;
}

.badge-cat {
    background-color: rgba(13, 148, 136, 0.1);
    color: var(--color-primary);
}

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

.badge-success {
    background-color: #d1fae5;
    color: #065f46;
}

.badge-warning {
    background-color: #fef3c7;
    color: #92400e;
}

.badge-danger {
    background-color: #fee2e2;
    color: #991b1b;
}

.badge-info {
    background-color: #e0f2fe;
    color: #0369a1;
}

/* Header & Navigation */
.site-header {
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 50;
    box-shadow: var(--shadow-sm);
}

.header-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0.75rem 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
}

.brand-logo {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--color-secondary);
}

.logo-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    background-color: var(--color-primary-light);
    color: var(--color-primary);
}

.main-nav {
    display: none;
}

@media (min-width: 900px) {
    .main-nav {
        display: block;
    }
}

.nav-list {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text);
    padding: 0.5rem 0.25rem;
    position: relative;
}

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--color-primary);
    border-radius: 2px;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.auth-buttons {
    display: none;
    gap: 0.6rem;
}

@media (min-width: 640px) {
    .auth-buttons {
        display: flex;
    }
}

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

.user-profile-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: transparent;
    border: 1px solid var(--color-border);
    padding: 0.35rem 0.75rem;
    border-radius: var(--radius-full);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
}

.user-avatar-initial {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background-color: var(--color-primary);
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
}

.user-name-label {
    max-width: 120px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.user-dropdown-menu {
    display: none;
    position: absolute;
    right: 0;
    top: calc(100% + 8px);
    width: 220px;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 100;
    padding: 0.5rem 0;
}

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

.dropdown-header {
    padding: 0.6rem 1rem;
    border-bottom: 1px solid var(--color-border-light);
}

.dropdown-header strong {
    display: block;
    font-size: 0.9rem;
    color: var(--color-secondary);
}

.dropdown-header small {
    color: var(--color-text-muted);
    word-break: break-all;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.55rem 1rem;
    font-size: 0.9rem;
    color: var(--color-text);
}

.dropdown-item:hover {
    background-color: var(--color-bg);
    color: var(--color-primary);
}

.dropdown-divider {
    height: 1px;
    background-color: var(--color-border-light);
    margin: 0.4rem 0;
}

/* Mobile Nav Drawer */
.mobile-toggle-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: transparent;
    cursor: pointer;
}

@media (min-width: 900px) {
    .mobile-toggle-btn {
        display: none;
    }
}

.mobile-nav-drawer {
    position: fixed;
    top: 0;
    right: -300px;
    width: 280px;
    height: 100vh;
    background-color: var(--color-surface);
    z-index: 200;
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    transition: right 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow-y: auto;
}

.mobile-nav-drawer.open {
    right: 0;
}

.mobile-nav-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem;
    border-bottom: 1px solid var(--color-border);
}

.mobile-close-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    min-height: 44px;
    min-width: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.mobile-nav-list {
    padding: 1rem 0;
    flex: 1;
}

.mobile-nav-link {
    display: block;
    padding: 0.75rem 1.25rem;
    font-weight: 500;
    font-size: 1rem;
    border-left: 3px solid transparent;
}

.mobile-nav-link.active, .mobile-nav-link:hover {
    background-color: var(--color-bg);
    color: var(--color-primary);
    border-left-color: var(--color-primary);
}

.mobile-nav-footer {
    padding: 1.25rem;
    border-top: 1px solid var(--color-border);
}

.mobile-user-info {
    margin-bottom: 1rem;
}

.mobile-backdrop {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(15, 23, 42, 0.4);
    backdrop-filter: blur(2px);
    z-index: 150;
}

.mobile-backdrop.show {
    display: block;
}

/* Flash Alerts */
.alert {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.85rem 1.25rem;
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.alert-success {
    background-color: #ecfdf5;
    border: 1px solid #a7f3d0;
    color: #065f46;
}

.alert-error {
    background-color: #fef2f2;
    border: 1px solid #fecaca;
    color: #991b1b;
}

.alert-warning {
    background-color: #fffbeb;
    border: 1px solid #fde68a;
    color: #92400e;
}

.alert-info {
    background-color: #f0f9ff;
    border: 1px solid #bae6fd;
    color: #0369a1;
}

.alert-icon {
    flex-shrink: 0;
    margin-top: 2px;
}

.alert-body {
    flex: 1;
}

.alert-close {
    background: transparent;
    border: none;
    font-size: 1.25rem;
    line-height: 1;
    cursor: pointer;
    color: inherit;
    padding: 0 0.25rem;
}

/* Sections Common */
.section {
    padding: 3rem 0;
}

@media (min-width: 768px) {
    .section {
        padding: 4.5rem 0;
    }
}

.section-alt {
    background-color: #ffffff;
}

.section-header {
    margin-bottom: 2.5rem;
}

.section-title {
    margin-bottom: 0.5rem;
    position: relative;
    display: inline-block;
}

.section-subtitle {
    color: var(--color-text-muted);
    font-size: 1.05rem;
    max-width: 650px;
    margin: 0 auto;
}

.text-left .section-subtitle {
    margin: 0;
}

/* Hero Section */
.hero-section {
    padding: 3rem 0 3.5rem;
    background: linear-gradient(180deg, #ffffff 0%, var(--color-bg) 100%);
    border-bottom: 1px solid var(--color-border);
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2.5rem;
    align-items: center;
}

@media (min-width: 900px) {
    .hero-grid {
        grid-template-columns: 1.15fr 0.85fr;
    }
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    padding: 0.35rem 0.85rem;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1rem;
    border: 1px solid rgba(13, 148, 136, 0.2);
}

.hero-title {
    font-size: clamp(2rem, 4.5vw, 3rem);
    letter-spacing: -0.02em;
    margin-bottom: 1.25rem;
}

.hero-lead {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    margin-bottom: 1.75rem;
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.85rem;
    margin-bottom: 2.5rem;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-border);
}

.stat-num {
    display: block;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-secondary);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.hero-visual {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    box-shadow: var(--shadow-md);
}

.hero-card-featured {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.hero-card-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.hero-card-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Category Grid & Cards */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 1rem;
}

.category-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1.25rem 1rem;
    text-align: center;
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.6rem;
}

.category-card:hover {
    transform: translateY(-2px);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.cat-icon-wrap {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background-color: var(--color-bg);
    color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.cat-name {
    font-weight: 600;
    font-size: 1rem;
    color: var(--color-secondary);
}

.cat-count {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

/* Course Grid & Cards */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.course-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: all 0.25s ease;
    box-shadow: var(--shadow-sm);
}

.course-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: #cbd5e1;
}

.course-card-thumb-link {
    position: relative;
    aspect-ratio: 16/9;
    background-color: #0f172a;
    overflow: hidden;
    display: block;
}

.course-card-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.course-card:hover .course-card-img {
    transform: scale(1.03);
}

.course-card-img-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    color: #94a3b8;
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    font-size: 0.9rem;
}

.course-card-thumb-link .badge-featured {
    position: absolute;
    top: 0.75rem;
    left: 0.75rem;
}

.course-card-thumb-link .badge-cat {
    position: absolute;
    bottom: 0.75rem;
    left: 0.75rem;
    background-color: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(4px);
}

.course-card-body {
    padding: 1.25rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.course-card-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-bottom: 0.6rem;
    flex-wrap: wrap;
}

.meta-item {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
}

.meta-level {
    margin-left: auto;
    background-color: var(--color-bg);
    padding: 0.15rem 0.45rem;
    border-radius: var(--radius-sm);
}

.course-card-title {
    font-size: 1.125rem;
    margin-bottom: 0.6rem;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.course-card-title a:hover {
    color: var(--color-primary);
}

.course-card-desc {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-bottom: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.course-card-instructor {
    margin-top: auto;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.85rem;
    color: var(--color-secondary);
    font-weight: 500;
}

.course-card-footer {
    padding: 0.85rem 1.25rem;
    border-top: 1px solid var(--color-border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: #fafbfc;
}

.course-card-price {
    display: flex;
    align-items: baseline;
    gap: 0.4rem;
}

.price-current {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-primary);
}

.price-original {
    font-size: 0.85rem;
    text-decoration: line-through;
    color: var(--color-text-muted);
}

.price-free {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--color-success);
}

/* Benefits & Feature Cards */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.feature-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    box-shadow: var(--shadow-sm);
}

.feature-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-card h3 {
    font-size: 1.15rem;
}

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

/* How It Works Steps */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
    counter-reset: step-counter;
}

.step-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 2rem 1.5rem;
    text-align: center;
    position: relative;
    box-shadow: var(--shadow-sm);
}

.step-number {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background-color: var(--color-primary);
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    font-weight: 700;
    margin: 0 auto 1.25rem;
}

.step-card h3 {
    margin-bottom: 0.5rem;
}

.step-card p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

/* Testimonials */
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.testimonial-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    box-shadow: var(--shadow-sm);
}

.review-stars {
    display: flex;
    gap: 2px;
    color: var(--color-accent);
    margin-bottom: 0.75rem;
}

.review-quote {
    font-size: 0.95rem;
    color: var(--color-text);
    margin-bottom: 1.25rem;
    font-style: italic;
    line-height: 1.6;
}

.reviewer-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.reviewer-avatar-placeholder {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--color-bg);
    color: var(--color-primary);
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
}

.reviewer-info strong {
    display: block;
    font-size: 0.95rem;
    color: var(--color-secondary);
}

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

/* FAQ Accordion */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}

.faq-item {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.faq-question {
    width: 100%;
    padding: 1rem 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    background: transparent;
    border: none;
    cursor: pointer;
    font-weight: 600;
    font-size: 1rem;
    color: var(--color-secondary);
    text-align: left;
}

.faq-icon {
    flex-shrink: 0;
    transition: transform 0.2s ease;
}

.faq-item.active .faq-icon {
    transform: rotate(180deg);
}

.faq-answer {
    padding: 0 1.25rem 1.25rem;
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.6;
    display: none;
}

.faq-item.active .faq-answer {
    display: block;
}

/* CTA Banner */
.cta-banner {
    background: linear-gradient(135deg, var(--color-secondary) 0%, #1e293b 100%);
    color: #ffffff;
    border-radius: var(--radius-lg);
    padding: 3rem 1.5rem;
    text-align: center;
    box-shadow: var(--shadow-md);
}

.cta-banner h2 {
    color: #ffffff;
    margin-bottom: 0.75rem;
}

.cta-banner p {
    color: #94a3b8;
    max-width: 600px;
    margin: 0 auto 1.75rem;
    font-size: 1.05rem;
}

/* Forms & Inputs */
.form-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    max-width: 480px;
    margin: 2.5rem auto;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-secondary);
    margin-bottom: 0.4rem;
}

.form-control {
    width: 100%;
    min-height: 44px;
    padding: 0.65rem 0.85rem;
    font-size: 0.95rem;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.15);
}

textarea.form-control {
    min-height: 100px;
    resize: vertical;
}

.form-hint {
    display: block;
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-top: 0.35rem;
}

/* Filter Controls on Courses Page */
.filter-bar {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    margin-bottom: 2rem;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
    justify-content: space-between;
}

.filter-inputs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    flex: 1;
}

.search-box {
    position: relative;
    min-width: 240px;
    flex: 1;
}

.search-box input {
    padding-left: 2.25rem;
}

.search-icon {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-muted);
}

/* Course Details Page */
.course-detail-header {
    background: linear-gradient(180deg, #ffffff 0%, var(--color-bg) 100%);
    border-bottom: 1px solid var(--color-border);
    padding: 2.5rem 0;
}

.course-detail-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

@media (min-width: 900px) {
    .course-detail-grid {
        grid-template-columns: 2fr 1fr;
    }
}

.course-sidebar-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 90px;
}

.sidebar-price-wrap {
    margin-bottom: 1.25rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--color-border-light);
}

.sidebar-features-list {
    margin: 1.25rem 0;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.sidebar-feat-item {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 0.9rem;
    color: var(--color-text);
}

.curriculum-list {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    margin-top: 1rem;
}

.curriculum-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.85rem 1rem;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
}

.curriculum-item.previewable {
    border-left: 3px solid var(--color-primary);
}

/* Video Responsive 16:9 Player */
.video-responsive-wrapper {
    position: relative;
    width: 100%;
    padding-top: 56.25%; /* 16:9 Aspect Ratio */
    background-color: #000000;
    border-radius: var(--radius-md);
    overflow: hidden;
}

.video-iframe, .video-element {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

.video-fallback {
    display: flex;
    align-items: center;
    justify-content: center;
    color: #cbd5e1;
    background-color: #0f172a;
}

.video-fallback-inner {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    padding: 1.5rem;
    width: 90%;
}

.video-fallback-inner svg {
    margin: 0 auto 0.75rem;
    color: #64748b;
}

.video-fallback-inner h4 {
    color: #ffffff;
    margin-bottom: 0.35rem;
}

.video-fallback-inner p {
    font-size: 0.85rem;
    color: #94a3b8;
}

/* Learning Page Classroom Layout */
.classroom-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    padding: 1.5rem 0 3rem;
}

@media (min-width: 992px) {
    .classroom-container {
        grid-template-columns: 1fr 340px;
    }
}

.classroom-player-area {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.lesson-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.75rem;
    padding: 1rem 1.25rem;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

.classroom-sidebar {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    max-height: 800px;
}

.sidebar-header-box {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--color-border);
    background-color: #fafbfc;
}

.classroom-playlist {
    overflow-y: auto;
    flex: 1;
}

.playlist-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.85rem 1.25rem;
    border-bottom: 1px solid var(--color-border-light);
    font-size: 0.9rem;
    transition: background-color 0.2s ease;
}

.playlist-item:hover {
    background-color: var(--color-bg);
}

.playlist-item.active {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    font-weight: 600;
    border-left: 3px solid var(--color-primary);
}

.playlist-item.completed .check-circle {
    color: var(--color-success);
}

/* Dashboard & Cards */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.25rem;
    margin-bottom: 2rem;
}

.stat-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    box-shadow: var(--shadow-sm);
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.stat-icon.primary { background-color: var(--color-primary-light); color: var(--color-primary); }
.stat-icon.warning { background-color: #fef3c7; color: #d97706; }
.stat-icon.success { background-color: #d1fae5; color: #059669; }
.stat-icon.info { background-color: #e0f2fe; color: #0284c7; }

.stat-info .stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-secondary);
    line-height: 1.2;
}

.stat-info .stat-title {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* Progress Bar */
.progress-bar-wrap {
    width: 100%;
    height: 8px;
    background-color: var(--color-border-light);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin: 0.5rem 0;
}

.progress-bar-fill {
    height: 100%;
    background-color: var(--color-primary);
    border-radius: var(--radius-full);
    transition: width 0.3s ease;
}

/* Certificate Visual Card */
.certificate-preview-box {
    background-color: #ffffff;
    border: 8px double #cbd5e1;
    border-radius: var(--radius-md);
    padding: 2.5rem 2rem;
    text-align: center;
    position: relative;
    max-width: 700px;
    margin: 2rem auto;
    box-shadow: var(--shadow-lg);
}

.certificate-header {
    border-bottom: 2px solid var(--color-primary);
    padding-bottom: 1rem;
    margin-bottom: 1.5rem;
}

.cert-student-name {
    font-size: 1.75rem;
    color: var(--color-secondary);
    font-weight: 700;
    margin: 1rem 0;
    text-decoration: underline;
    text-decoration-color: var(--color-primary);
}

.cert-course-title {
    font-size: 1.35rem;
    color: var(--color-primary);
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.cert-footer-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 2.5rem;
    padding-top: 1.5rem;
    border-top: 1px dashed var(--color-border);
    font-size: 0.9rem;
}

/* Payment Instructions Card */
.payment-method-box {
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    margin-bottom: 1rem;
    background-color: var(--color-surface);
    cursor: pointer;
    transition: all 0.2s ease;
}

.payment-method-box.selected {
    border-color: var(--color-primary);
    background-color: var(--color-primary-light);
}

.payment-method-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.5rem;
}

.payment-num-badge {
    background-color: #ffffff;
    border: 1px solid var(--color-border);
    padding: 0.25rem 0.6rem;
    border-radius: var(--radius-sm);
    font-family: monospace;
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-secondary);
}

/* Footer Styles */
.site-footer {
    background-color: var(--color-secondary);
    color: #94a3b8;
    margin-top: auto;
}

.footer-top {
    padding: 3.5rem 0 2.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 1.25rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 2rem;
}

.footer-logo .logo-text {
    color: #ffffff;
}

.footer-bio {
    font-size: 0.9rem;
    line-height: 1.6;
    margin: 1rem 0;
}

.footer-socials {
    display: flex;
    gap: 0.75rem;
}

.social-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.08);
    color: #ffffff;
    transition: background-color 0.2s ease;
}

.social-icon:hover {
    background-color: var(--color-primary);
}

.footer-col-title {
    color: #ffffff;
    font-size: 1.05rem;
    margin-bottom: 1.25rem;
}

.footer-links li {
    margin-bottom: 0.6rem;
}

.footer-links a {
    color: #94a3b8;
    font-size: 0.9rem;
}

.footer-links a:hover {
    color: #ffffff;
    padding-left: 4px;
}

.footer-contact-info li {
    display: flex;
    align-items: flex-start;
    gap: 0.6rem;
    font-size: 0.9rem;
    margin-bottom: 0.75rem;
}

.footer-bottom {
    padding: 1.25rem 0;
    font-size: 0.85rem;
}

.bottom-flex {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.payment-badges-preview {
    display: flex;
    gap: 0.5rem;
}

.pay-chip {
    background-color: rgba(255, 255, 255, 0.08);
    color: #e2e8f0;
    padding: 0.2rem 0.6rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
}

/* Responsive Utilities & Spacing */
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

/* Print Styles for Certificate */
@media print {
    body * {
        visibility: hidden;
    }
    .certificate-preview-box, .certificate-preview-box * {
        visibility: visible;
    }
    .certificate-preview-box {
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
        max-width: 100%;
        box-shadow: none;
        border: 4px double #000;
    }
    .no-print {
        display: none !important;
    }
}