/* ============================================
   Nored Farms - Course Platform Styles
   ============================================ */

/* -- Auth Page -- */
.auth-page {
    padding-top: 100px;
    min-height: 100vh;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-bottom: 4rem;
}

.auth-container {
    width: 100%;
    max-width: 420px;
    margin: 2rem 1.5rem;
    padding: 2.5rem;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-2xl);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.25);
}

.auth-header {
    text-align: center;
    margin-bottom: 2rem;
}

.auth-logo {
    color: var(--color-primary);
    margin-bottom: 1rem;
}

.auth-header h1 {
    font-family: var(--font-serif);
    font-size: var(--text-2xl);
    color: var(--color-text);
    margin-bottom: 0.5rem;
}

.auth-header p {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* Tabs */
.auth-tabs {
    display: flex;
    gap: 0;
    margin-bottom: 1.5rem;
    background: var(--color-bg-alt, var(--color-surface));
    border-radius: var(--radius-lg);
    padding: 4px;
    border: 1px solid var(--color-border);
}

.auth-tab {
    flex: 1;
    padding: 0.625rem 1rem;
    background: none;
    border: none;
    border-radius: calc(var(--radius-lg) - 2px);
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.auth-tab.active {
    background: var(--color-bg);
    color: var(--color-text);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.25);
}

/* Forms */
.auth-form {
    display: none;
}

.auth-form.active {
    display: block;
}

.form-field {
    margin-bottom: 1rem;
}

.form-field label {
    display: block;
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: 0.375rem;
}

.form-field input {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--color-bg);
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-lg);
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    color: var(--color-text);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    box-sizing: border-box;
}

.form-field input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-subtle);
}

.form-field input::placeholder {
    color: var(--color-text-muted);
    opacity: 0.6;
}

/* Valid field indicator — subtle teal border when filled and valid */
.form-field input:required:valid:not(:placeholder-shown) {
    border-color: rgba(80, 232, 192, 0.3);
}

/* Auth Buttons */
.auth-btn {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius-lg);
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.auth-btn-primary {
    background: rgba(80, 232, 192, 0.08);
    color: var(--color-text-muted);
    border: 1.5px solid rgba(80, 232, 192, 0.1);
    box-shadow: none;
}

.auth-btn-primary:hover:not(:disabled):not(.auth-btn-ready) {
    background: rgba(80, 232, 192, 0.12);
}

/* Lit-up state when all required fields are filled */
.auth-btn-primary.auth-btn-ready {
    background: #50e8c0;
    color: #12181a;
    border-color: #50e8c0;
    box-shadow: 0 0 20px rgba(80, 232, 192, 0.25), 0 4px 12px rgba(0, 0, 0, 0.2);
}

.auth-btn-primary.auth-btn-ready:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 0 28px rgba(80, 232, 192, 0.35), 0 6px 20px rgba(0, 0, 0, 0.3);
    background: #5eedc8;
}

.auth-btn-primary.auth-btn-ready:active:not(:disabled) {
    transform: translateY(0);
    box-shadow: 0 0 14px rgba(80, 232, 192, 0.2), 0 2px 8px rgba(0, 0, 0, 0.2);
}

.auth-btn-primary:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.auth-btn-secondary {
    background: var(--color-bg);
    color: var(--color-text);
    border: 1.5px solid var(--color-border);
}

.auth-btn-secondary:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.spinner {
    width: 20px;
    height: 20px;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Divider */
.auth-divider {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 1.25rem 0;
    color: var(--color-text-muted);
    font-size: var(--text-xs);
}

.auth-divider::before,
.auth-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--color-border);
}

/* Links */
.auth-links {
    text-align: center;
    margin-top: 1rem;
}

.auth-links a {
    font-size: var(--text-sm);
    color: var(--color-primary);
    text-decoration: none;
}

.auth-links a:hover {
    text-decoration: underline;
}

.auth-form-note {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    margin-bottom: 1rem;
    line-height: 1.6;
}

/* Messages */
.auth-message {
    margin-top: 1.25rem;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-lg);
    font-size: var(--text-sm);
    line-height: 1.5;
    text-align: center;
}

.auth-message-success {
    background: var(--color--lemongrass, rgba(80, 232, 192, 0.1));
    color: var(--color--seedgreen, #bccac4);
    border: 1px solid rgba(80, 232, 192, 0.12);
}

.auth-message-error {
    background: rgba(196, 92, 75, 0.08);
    color: var(--color-error, #c45c4b);
    border: 1px solid rgba(196, 92, 75, 0.15);
}

/* -- Dashboard -- */
.dashboard-page {
    padding-top: 100px;
    min-height: 100vh;
}

.dashboard-header {
    max-width: 1100px;
    margin: 0 auto;
    padding: 2rem 1.5rem 1rem;
}

.dashboard-greeting {
    font-family: var(--font-serif);
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    color: var(--color-text);
    margin-bottom: 0.25rem;
}

.dashboard-subtitle {
    font-size: var(--text-base);
    color: var(--color-text-muted);
}

.dashboard-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.25rem;
}

.dashboard-grid {
    max-width: 1100px;
    margin: 2rem auto;
    padding: 0 1.5rem;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

/* Course Card */
.course-card {
    background: var(--color-bg);
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-2xl);
    padding: 1.75rem;
    display: flex;
    flex-direction: column;
    transition: all var(--transition-base);
}

.course-card:hover {
    border-color: var(--color-primary);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.25);
    transform: translateY(-2px);
}

.course-card-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 11px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    background: var(--color-primary-subtle);
    color: var(--color-primary);
    width: fit-content;
    margin-bottom: 0.75rem;
}

.course-card h3 {
    font-family: var(--font-serif);
    font-size: var(--text-xl);
    color: var(--color-text);
    margin-bottom: 0.5rem;
    line-height: 1.3;
}

.course-card-desc {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    line-height: 1.6;
    margin-bottom: 1.25rem;
    flex-grow: 1;
}

/* Progress Bar */
.progress-bar-container {
    margin-bottom: 1.25rem;
}

.progress-bar-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
    font-size: var(--text-xs);
    font-weight: 500;
    color: var(--color-text-muted);
}

.progress-bar-track {
    width: 100%;
    height: 8px;
    background: var(--color-bg-alt, var(--color-surface));
    border-radius: var(--radius-full);
    overflow: hidden;
    border: 1px solid var(--color-border);
}

.progress-bar-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    transition: width 0.6s ease;
    min-width: 0;
}

.course-card-actions {
    display: flex;
    gap: 0.5rem;
}

.course-card-btn {
    flex: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.375rem;
    padding: 0.625rem 1rem;
    border-radius: var(--radius-lg);
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
}

.course-card-btn-primary {
    background: var(--gradient-primary);
    color: var(--color-text-inverse);
}

.course-card-btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.course-card-btn-secondary {
    background: var(--color-bg);
    color: var(--color-text);
    border: 1.5px solid var(--color-border);
}

.course-card-btn-secondary:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.course-card-btn svg {
    width: 16px;
    height: 16px;
}

/* -- Catalog -- */
.catalog-page {
    padding-top: 100px;
    min-height: 100vh;
}

.catalog-hero {
    text-align: center;
    padding: 2rem 1.5rem 3rem;
    max-width: 720px;
    margin: 0 auto;
}

.catalog-hero h1 {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 4vw, 3rem);
    color: var(--color-text);
    margin-bottom: 0.75rem;
}

.catalog-hero p {
    font-size: var(--text-lg);
    color: var(--color-text-muted);
    line-height: 1.7;
}

.catalog-grid {
    max-width: 1100px;
    margin: 0 auto 4rem;
    padding: 0 1.5rem;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

/* -- Course Overview Page -- */
.course-overview-page {
    padding-top: 100px;
    min-height: 100vh;
}

.course-hero {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1.5rem 3rem;
}

.course-hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--color-primary-subtle);
    color: var(--color-primary);
    padding: 0.375rem 1rem;
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1.25rem;
}

.course-hero h1 {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 4.5vw, 3rem);
    color: var(--color-text);
    margin-bottom: 0.75rem;
    line-height: 1.2;
}

.course-hero-desc {
    font-size: var(--text-lg);
    color: var(--color-text-muted);
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.course-meta {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.course-meta-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

.course-meta-item svg {
    width: 18px;
    height: 18px;
    color: var(--color-primary);
}

/* Lesson List (on course overview) */
.lesson-list {
    max-width: 900px;
    margin: 0 auto 4rem;
    padding: 0 1.5rem;
}

.lesson-list-header {
    font-family: var(--font-serif);
    font-size: var(--text-xl);
    color: var(--color-text);
    margin-bottom: 1.25rem;
}

.lesson-list-items {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.lesson-list-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.25rem;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    text-decoration: none;
    color: var(--color-text);
    transition: all var(--transition-fast);
}

.lesson-list-item:hover {
    border-color: var(--color-primary);
    background: var(--color-primary-subtle);
}

.lesson-list-item.completed {
    border-color: var(--color--mossroot, #50e8c0);
}

.lesson-list-item.locked {
    opacity: 0.6;
    cursor: not-allowed;
}

.lesson-number {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-alt, var(--color-surface));
    border: 1.5px solid var(--color-border);
    border-radius: 50%;
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-muted);
    flex-shrink: 0;
}

.lesson-list-item.completed .lesson-number {
    background: var(--color--lemongrass, rgba(80, 232, 192, 0.1));
    border-color: var(--color--mossroot, #50e8c0);
    color: var(--color--mossroot, #50e8c0);
}

.lesson-info {
    flex-grow: 1;
}

.lesson-info-title {
    font-weight: 500;
    font-size: var(--text-sm);
    margin-bottom: 0.125rem;
}

.lesson-info-meta {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
}

.lesson-status-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    color: var(--color-text-muted);
}

.lesson-list-item.completed .lesson-status-icon {
    color: var(--color--mossroot, #50e8c0);
}

/* -- Lesson Viewer -- */
.lesson-page {
    padding-top: 80px;
    min-height: 100vh;
}

.lesson-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    max-width: 1200px;
    margin: 0 auto;
    min-height: calc(100vh - 80px);
}

/* Sidebar */
.lesson-sidebar {
    position: sticky;
    top: 80px;
    height: calc(100vh - 80px);
    overflow-y: auto;
    border-right: 1px solid var(--color-border);
    background: var(--color-bg);
    padding: 1.5rem 0;
}

.lesson-sidebar-header {
    padding: 0 1.25rem 1rem;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 0.75rem;
}

.lesson-sidebar-title {
    font-family: var(--font-serif);
    font-size: var(--text-base);
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: 0.25rem;
}

.lesson-sidebar-progress {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
}

.sidebar-lesson-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.625rem 1.25rem;
    text-decoration: none;
    color: var(--color-text-muted);
    font-size: var(--text-sm);
    transition: all var(--transition-fast);
    border-left: 3px solid transparent;
}

.sidebar-lesson-link:hover {
    background: var(--color-primary-subtle);
    color: var(--color-text);
}

.sidebar-lesson-link.active {
    border-left-color: var(--color-primary);
    background: var(--color-primary-subtle);
    color: var(--color-primary);
    font-weight: 500;
}

.sidebar-lesson-link.completed {
    color: var(--color--mossroot, #50e8c0);
}

.sidebar-lesson-num {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 11px;
    font-weight: 500;
    background: var(--color-bg-alt, var(--color-surface));
    border: 1px solid var(--color-border);
    flex-shrink: 0;
}

.sidebar-lesson-link.completed .sidebar-lesson-num {
    background: var(--color--lemongrass, rgba(80, 232, 192, 0.1));
    border-color: var(--color--mossroot, #50e8c0);
    color: var(--color--mossroot, #50e8c0);
}

.sidebar-lesson-link.active .sidebar-lesson-num {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-text-inverse);
}

/* Lesson Content */
.lesson-content-area {
    padding: 2rem 3rem 4rem;
    max-width: 800px;
}

.lesson-breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    margin-bottom: 1.5rem;
}

.lesson-breadcrumb a {
    color: var(--color-primary);
    text-decoration: none;
}

.lesson-breadcrumb a:hover {
    text-decoration: underline;
}

.lesson-breadcrumb-sep {
    color: var(--color-border);
}

.lesson-content-area h1 {
    font-family: var(--font-serif);
    font-size: clamp(1.75rem, 3.5vw, 2.25rem);
    color: var(--color-text);
    margin-bottom: 0.5rem;
    line-height: 1.25;
}

.lesson-time-estimate {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    margin-bottom: 2rem;
}

.lesson-time-estimate svg {
    width: 14px;
    height: 14px;
}

.lesson-body {
    font-size: var(--text-base);
    color: var(--color-text);
    line-height: 1.8;
}

.lesson-body h2 {
    font-family: var(--font-serif);
    font-size: var(--text-xl);
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    color: var(--color-text);
}

.lesson-body h3 {
    font-size: var(--text-lg);
    font-weight: 500;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
    color: var(--color-text);
}

.lesson-body p {
    margin-bottom: 1.25rem;
}

.lesson-body ul,
.lesson-body ol {
    margin-bottom: 1.25rem;
    padding-left: 1.5rem;
}

.lesson-body li {
    margin-bottom: 0.375rem;
    line-height: 1.7;
}

/* Lesson Footer Actions */
.lesson-footer-actions {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}

.mark-complete-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--gradient-primary);
    color: var(--color-text-inverse);
    border: none;
    border-radius: var(--radius-lg);
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
}

.mark-complete-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.mark-complete-btn.completed {
    background: var(--color--mossroot, #50e8c0);
    cursor: default;
}

.mark-complete-btn svg {
    width: 18px;
    height: 18px;
}

.next-lesson-link {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-primary);
    text-decoration: none;
}

.next-lesson-link:hover {
    text-decoration: underline;
}

.next-lesson-link svg {
    width: 16px;
    height: 16px;
}

/* -- Content Gating -- */
.gated-content {
    text-align: center;
    padding: 4rem 2rem;
    max-width: 500px;
    margin: 0 auto;
}

.gated-content svg {
    width: 64px;
    height: 64px;
    color: var(--color-text-muted);
    margin-bottom: 1.5rem;
}

.gated-content h2 {
    font-family: var(--font-serif);
    font-size: var(--text-xl);
    color: var(--color-text);
    margin-bottom: 0.75rem;
}

.gated-content p {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

/* -- Certificate -- */
.certificate-page {
    padding-top: 100px;
    min-height: 100vh;
    text-align: center;
}

.certificate-container {
    max-width: 900px;
    margin: 2rem auto 4rem;
    padding: 0 1.5rem;
}

.certificate-canvas-wrapper {
    margin-bottom: 2rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.25);
}

.certificate-canvas-wrapper canvas {
    display: block;
    width: 100%;
    height: auto;
}

.certificate-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

/* -- Profile Page -- */
.profile-page {
    padding-top: 100px;
    min-height: 100vh;
}

.profile-container {
    max-width: 600px;
    margin: 2rem auto 4rem;
    padding: 0 1.5rem;
}

.profile-container h1 {
    font-family: var(--font-serif);
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    color: var(--color-text);
    margin-bottom: 2rem;
}

.profile-section {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-2xl);
    padding: 2rem;
    margin-bottom: 1.5rem;
}

.profile-section h2 {
    font-size: var(--text-lg);
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: 1.25rem;
}

.profile-field {
    margin-bottom: 1rem;
}

.profile-field label {
    display: block;
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: 0.375rem;
}

.profile-field input {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--color-bg);
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-lg);
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    color: var(--color-text);
    box-sizing: border-box;
}

.profile-field input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-subtle);
}

.profile-tier-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--color-primary-subtle);
    color: var(--color-primary);
    border-radius: var(--radius-lg);
    font-size: var(--text-sm);
    font-weight: 500;
}

/* -- Empty States -- */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    grid-column: 1 / -1;
}

.empty-state svg {
    width: 64px;
    height: 64px;
    color: var(--color-text-muted);
    margin-bottom: 1.5rem;
    opacity: 0.5;
}

.empty-state h2 {
    font-family: var(--font-serif);
    font-size: var(--text-xl);
    color: var(--color-text);
    margin-bottom: 0.75rem;
}

.empty-state p {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

/* -- Success Banner -- */
.success-banner {
    max-width: 1100px;
    margin: 0 auto 1rem;
    padding: 0 1.5rem;
}

.success-banner-inner {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.25rem;
    background: var(--color--lemongrass, rgba(80, 232, 192, 0.1));
    border: 1px solid rgba(80, 232, 192, 0.12);
    border-radius: var(--radius-xl);
    color: var(--color--seedgreen, #bccac4);
    font-size: var(--text-sm);
    font-weight: 500;
}

.success-banner-inner svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

/* -- Responsive -- */
@media (max-width: 900px) {
    .lesson-layout {
        grid-template-columns: 1fr;
    }

    .lesson-sidebar {
        position: relative;
        top: auto;
        height: auto;
        border-right: none;
        border-bottom: 1px solid var(--color-border);
        max-height: 300px;
    }

    .lesson-content-area {
        padding: 1.5rem;
    }
}

@media (max-width: 768px) {
    .auth-container {
        margin: 1rem;
        padding: 1.75rem;
    }

    .dashboard-grid,
    .catalog-grid {
        grid-template-columns: 1fr;
    }

    .lesson-footer-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .certificate-actions {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .course-meta {
        flex-direction: column;
        gap: 0.5rem;
    }
}