/*
 * PinBusinessEnglish.com application UI
 * Shared visual system based on the approved index.html interface.
 */

* {
    box-sizing: border-box;
}

:root {
    --primary: #0a1a2f;
    --primary-light: #162942;
    --primary-soft: #162942;
    --primary-dark: #050f1d;
    --accent: #c5a059;
    --accent-light: #d9b878;
    --accent-dark: #a8854a;
    --accent-soft: #f7edda;
    --text-light: #f8fafc;
    --text-dark: #1e293b;
    --text: #1e293b;
    --text-muted: #64748b;
    --muted: #64748b;
    --bg-light: #f8f9fa;
    --background: #f8f9fa;
    --bg-white: #ffffff;
    --surface: #ffffff;
    --border: #e2e8f0;
    --success: #14704a;
    --success-soft: #e5f6ed;
    --danger: #a52a2a;
    --danger-soft: #fff0f0;
    --warning: #8a5a06;
    --warning-soft: #fff7e5;
    --info: #215fa6;
    --info-soft: #e9f2ff;
    --locked: #66758b;
    --locked-soft: #eef2f6;
    --focus: #c5a059;
    --shadow-sm: 0 2px 8px rgba(10, 26, 47, 0.06);
    --shadow-md: 0 10px 30px rgba(10, 26, 47, 0.08);
    --shadow-lg: 0 20px 50px rgba(10, 26, 47, 0.12);
    --shadow-gold: 0 10px 40px rgba(197, 160, 89, 0.25);
    --shadow: var(--shadow-md);
}

html {
    scroll-behavior: smooth;
    background: var(--bg-light);
}

body {
    min-height: 100vh;
    color: var(--text-dark);
    background:
        radial-gradient(circle at 95% 3%, rgba(197, 160, 89, 0.08), transparent 25rem),
        var(--bg-light);
    font-family: 'Lato', Arial, sans-serif;
    line-height: 1.7;
    overflow-x: hidden;
}

::selection {
    color: var(--primary);
    background: var(--accent);
}

h1,
h2,
h3,
h4,
h5,
h6 {
    color: var(--primary);
    font-family: 'Playfair Display', Georgia, serif;
    font-weight: 700;
    line-height: 1.2;
}

a {
    transition: color 0.25s ease, background-color 0.25s ease, border-color 0.25s ease,
        transform 0.25s ease, box-shadow 0.25s ease;
}

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

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 3px solid rgba(197, 160, 89, 0.42);
    outline-offset: 3px;
}

/* Shared navigation */
body > nav,
.site-nav {
    position: sticky;
    top: 0;
    z-index: 1000;
    min-height: 72px;
    padding: 0.8rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    color: var(--text-light);
    background: rgba(10, 26, 47, 0.92);
    border-bottom: 1px solid rgba(197, 160, 89, 0.32);
    box-shadow: 0 10px 30px rgba(5, 15, 29, 0.14);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
}

body > nav .logo,
.site-nav .brand,
.site-nav .logo {
    min-height: 48px;
    padding: 0.45rem 1rem 0.45rem 0.65rem;
    display: inline-flex;
    align-items: center;
    gap: 0.65rem;
    flex: 0 0 auto;
    color: var(--primary);
    background: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.8);
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.24);
    font-family: 'Playfair Display', Georgia, serif;
    font-size: clamp(1.05rem, 2vw, 1.35rem);
    font-weight: 700;
    line-height: 1;
    letter-spacing: 0.01em;
    white-space: nowrap;
}

body > nav .logo::before,
.site-nav .brand::before,
.site-nav .logo::before {
    width: 36px;
    height: 36px;
    content: '';
    flex: 0 0 36px;
    background: #ffffff url('../images/learn.png') center / contain no-repeat;
    border-radius: 6px;
}

body > nav .logo:hover,
.site-nav .brand:hover,
.site-nav .logo:hover {
    color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(197, 160, 89, 0.3);
}

body > nav .logo span,
.site-nav .brand span,
.site-nav .logo span {
    color: #d97706;
}

.nav-actions,
.nav-links {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.7rem;
}

.nav-actions > a:not(.button):not(.btn),
.nav-links > a:not(.button):not(.btn),
.site-nav .nav-pill,
.site-nav .message-pill,
body > nav .nav-link {
    min-height: 40px;
    padding: 0.62rem 0.9rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #d7e0eb;
    background: transparent;
    border: 1px solid transparent;
    border-radius: 6px;
    font-size: 0.82rem;
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    white-space: nowrap;
}

.nav-actions > a:not(.button):not(.btn):hover,
.nav-links > a:not(.button):not(.btn):hover,
.site-nav .nav-pill:hover,
.site-nav .nav-pill.active,
.site-nav .message-pill:hover,
body > nav .nav-link:hover {
    color: var(--primary);
    background: var(--accent);
    border-color: var(--accent);
}

.menu-toggle {
    width: 44px;
    height: 44px;
    padding: 9px;
    display: none;
    flex: 0 0 44px;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    color: var(--text-light);
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: 7px;
    cursor: pointer;
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    display: block;
    background: currentColor;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.menu-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Shared buttons */
.btn,
.button,
button.btn,
button.button,
.back-btn {
    min-height: 42px;
    padding: 0.75rem 1.25rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.45rem;
    color: var(--primary);
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    border: 1px solid var(--accent);
    border-radius: 6px;
    box-shadow: 0 4px 15px rgba(197, 160, 89, 0.22);
    font-size: 0.79rem;
    font-weight: 700;
    line-height: 1.25;
    letter-spacing: 0.09em;
    text-align: center;
    text-decoration: none;
    text-transform: uppercase;
    cursor: pointer;
}

.btn:hover,
.button:hover,
button.btn:hover,
button.button:hover,
.back-btn:hover {
    color: var(--primary);
    background: linear-gradient(135deg, var(--accent-light), var(--accent));
    border-color: var(--accent-light);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(197, 160, 89, 0.36);
}

.button-outline,
.btn-outline,
.button-secondary,
.btn-secondary {
    color: var(--primary);
    background: transparent;
    border: 1px solid var(--primary);
    box-shadow: none;
}

.button-outline:hover,
.btn-outline:hover,
.button-secondary:hover,
.btn-secondary:hover {
    color: var(--text-light);
    background: var(--primary);
    border-color: var(--primary);
}

.site-nav .button-outline,
.site-nav .btn-outline,
body > nav .button-outline,
body > nav .btn-outline {
    color: var(--text-light);
    border-color: rgba(248, 250, 252, 0.42);
}

.site-nav .button-outline:hover,
.site-nav .btn-outline:hover,
body > nav .button-outline:hover,
body > nav .btn-outline:hover {
    color: var(--primary);
    background: var(--text-light);
    border-color: var(--text-light);
}

.button-danger {
    color: #ffffff;
    background: var(--danger);
    border-color: var(--danger);
    box-shadow: none;
}

.button-danger:hover {
    color: #ffffff;
    background: #842020;
    border-color: #842020;
}

.button-disabled,
.button[disabled],
.btn[disabled],
button:disabled {
    opacity: 0.58;
    pointer-events: none;
    filter: grayscale(0.4);
}

/* Shared cards, forms, tables and feedback */
.panel,
.auth-card,
.payment-card,
.card,
.message-card,
.category-button,
.settings-section,
.help-card,
.identity-card,
.support-ticket,
.quiz-card,
.phrase-card,
.audio-recording-section,
.tab-content-wrapper,
.summary-card,
.notification-centre,
.audio-review-card,
.zip-upload-box {
    background: rgba(255, 255, 255, 0.98);
    border: 1px solid var(--border);
    border-radius: 14px;
    box-shadow: var(--shadow-md);
}

.auth-card,
.payment-card,
.card {
    border-top: 5px solid var(--accent);
    box-shadow: var(--shadow-lg);
}

.panel:hover,
.message-card:hover,
.category-button:hover,
.help-card:hover,
.factor-card:hover,
.skill-card:hover {
    border-color: rgba(197, 160, 89, 0.72);
    box-shadow: var(--shadow-gold);
}

.field label,
.form-group label,
.field-group label,
label {
    color: var(--primary);
    font-weight: 700;
}

input:not([type='checkbox']):not([type='radio']):not([type='range']),
select,
textarea {
    width: 100%;
    min-height: 44px;
    padding: 0.72rem 0.85rem;
    color: var(--text-dark);
    background: #ffffff;
    border: 1px solid #cbd5e1;
    border-radius: 7px;
    transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

input:not([type='checkbox']):not([type='radio']):not([type='range']):focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(197, 160, 89, 0.18);
}

input[type='file'] {
    padding: 0.65rem;
    background: #ffffff;
    border: 1px dashed #aebdce;
    border-radius: 7px;
}

input[type='file']::file-selector-button {
    margin-right: 0.75rem;
    padding: 0.55rem 0.75rem;
    color: var(--primary);
    background: var(--accent-soft);
    border: 1px solid var(--accent);
    border-radius: 5px;
    font-weight: 700;
    cursor: pointer;
}

.table-wrap,
.record-table-wrap {
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: #ffffff;
}

th {
    color: var(--primary);
    background: #f5f1e9;
    font-size: 0.72rem;
    font-weight: 900;
    letter-spacing: 0.07em;
    text-transform: uppercase;
}

th,
td {
    padding: 0.82rem;
    border-bottom: 1px solid var(--border);
    text-align: left;
    vertical-align: top;
}

tr:last-child td {
    border-bottom: 0;
}

.alert,
.alert-error,
.alert-success,
.flash {
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
}

.eyebrow {
    color: var(--accent-dark);
    font-size: 0.74rem;
    font-weight: 900;
    letter-spacing: 0.13em;
    text-transform: uppercase;
}

.progress-track,
.lesson-progress,
.factor-lesson-progress {
    overflow: hidden;
    background: #e5eaf0;
    border-radius: 999px;
}

.progress-fill,
.lesson-progress-fill {
    background: linear-gradient(90deg, var(--accent-dark), var(--accent-light));
    border-radius: inherit;
    box-shadow: 0 0 16px rgba(197, 160, 89, 0.28);
}

.status,
.status-badge,
.badge,
.meta-chip,
.skill-status {
    border-radius: 999px;
    font-weight: 700;
}

/* Account access pages */
.auth-wrapper,
.payment-container {
    position: relative;
    isolation: isolate;
    min-height: calc(100vh - 72px);
    padding: clamp(3rem, 7vw, 6rem) 5%;
    background:
        linear-gradient(rgba(5, 15, 29, 0.9), rgba(10, 26, 47, 0.94)),
        url('https://images.unsplash.com/photo-1454165804606-c3d57bc86b40?q=80&w=2070&auto=format&fit=crop') center / cover;
}

.auth-wrapper::before,
.payment-container::before {
    position: absolute;
    inset: 0;
    z-index: -1;
    content: '';
    background:
        radial-gradient(circle at 15% 20%, rgba(197, 160, 89, 0.16), transparent 25rem),
        radial-gradient(circle at 88% 70%, rgba(197, 160, 89, 0.11), transparent 28rem);
    pointer-events: none;
}

.auth-card,
.payment-card {
    width: 100%;
    padding: clamp(1.5rem, 5vw, 3rem);
}

.auth-card {
    max-width: 500px;
}

.payment-card {
    max-width: 620px;
}

.auth-card h1,
.payment-card h1 {
    margin-bottom: 0.65rem;
    font-size: clamp(2rem, 5vw, 2.7rem);
}

.auth-card > p,
.auth-card .subtext,
.payment-card .subtext {
    color: var(--text-muted);
}

.auth-footer {
    padding-top: 1.4rem;
    border-top: 1px solid var(--border);
}

.auth-footer a,
.forgot-link,
.refresh-link {
    color: var(--accent-dark);
    font-weight: 700;
    text-underline-offset: 3px;
}

.auth-footer a:hover,
.forgot-link:hover,
.refresh-link:hover {
    color: var(--primary);
    text-decoration: underline;
}

.price-tag {
    color: var(--accent-dark);
    text-shadow: 0 3px 12px rgba(197, 160, 89, 0.2);
}

.qr-box,
.instructions,
.pending-message,
.upload-area {
    background: #f8fafc;
    border-color: var(--border);
    border-radius: 10px;
}

.qr-box {
    box-shadow: inset 0 0 0 1px #ffffff;
}

.instructions,
.pending-message {
    border-left-color: var(--accent);
}

.upload-area {
    border-color: rgba(197, 160, 89, 0.68);
}

body > footer,
.portal-footer {
    padding: 1.75rem 5%;
    color: #94a3b8;
    background: var(--primary);
    border-top: 1px solid rgba(197, 160, 89, 0.3);
    text-align: center;
}

/* Student dashboard */
.dashboard,
.container,
.page,
.unit-container {
    width: min(1320px, 100%);
    margin-right: auto;
    margin-left: auto;
}

.dashboard,
.container,
.page {
    padding-right: clamp(1rem, 4vw, 4rem);
    padding-left: clamp(1rem, 4vw, 4rem);
}

.welcome-panel,
.unit-header,
.messages-header,
.settings-header,
.page-header:not(.main .page-header) {
    position: relative;
    overflow: hidden;
    color: var(--text-light);
    background:
        linear-gradient(125deg, rgba(5, 15, 29, 0.96), rgba(22, 41, 66, 0.93)),
        url('https://images.unsplash.com/photo-1454165804606-c3d57bc86b40?q=80&w=2070&auto=format&fit=crop') center / cover;
    border: 1px solid rgba(197, 160, 89, 0.32);
    box-shadow: var(--shadow-lg);
}

.welcome-panel::after,
.unit-header::after,
.messages-header::after,
.settings-header::after,
.page-header:not(.main .page-header)::after {
    position: absolute;
    top: -45%;
    right: -8%;
    width: 24rem;
    height: 24rem;
    content: '';
    background: radial-gradient(circle, rgba(197, 160, 89, 0.2), transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.welcome-panel h1,
.welcome-panel h2,
.unit-header h1,
.unit-header h2,
.messages-header h1,
.settings-header h1,
.page-header:not(.main .page-header) h1,
.page-header:not(.main .page-header) h2 {
    color: #ffffff;
}

.welcome-panel .eyebrow,
.unit-header .eyebrow,
.page-header:not(.main .page-header) .eyebrow {
    color: var(--accent);
}

.welcome-panel {
    border-radius: 0 0 20px 20px;
}

.stats-grid {
    gap: 1rem;
}

.dashboard .stat-card,
.main .stat-card {
    position: relative;
    overflow: hidden;
    background: #ffffff;
    border: 1px solid var(--border);
    border-top: 3px solid var(--accent);
    border-left: 1px solid var(--border);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
}

.dashboard .stat-card::after,
.main .stat-card::after {
    position: absolute;
    right: -2rem;
    bottom: -2.8rem;
    width: 7rem;
    height: 7rem;
    content: '';
    background: radial-gradient(circle, rgba(197, 160, 89, 0.13), transparent 72%);
    border-radius: 50%;
}

.dashboard .stat-card strong,
.dashboard .stat-value,
.main .stat-card strong {
    color: var(--primary);
}

.continue-panel,
.certificate-panel,
.referral-panel,
.transparency-card,
.factor-card,
.skill-card,
.value-item {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 14px;
    box-shadow: var(--shadow-md);
}

.continue-panel,
.certificate-panel,
.referral-panel {
    border-top: 4px solid var(--accent);
}

.factor-card.active,
.factor-card.current,
.skill-card.active {
    border-color: var(--accent);
    box-shadow: var(--shadow-gold);
}

.factor-number,
.value-number,
.certificate-ring {
    color: var(--primary);
    background: linear-gradient(135deg, var(--accent-light), var(--accent-dark));
}

/* Lesson workspace */
.unit-container {
    padding-bottom: 4rem;
}

.unit-header {
    width: 100%;
    padding: clamp(2rem, 6vw, 4.2rem) clamp(1rem, 5vw, 4rem);
    border-radius: 0 0 18px 18px;
}

.layout-wrapper {
    align-items: start;
    gap: clamp(1rem, 3vw, 2rem);
    padding: clamp(1.25rem, 4vw, 3rem) clamp(1rem, 5vw, 4rem);
}

.lesson-sidebar {
    top: 96px;
    overflow: hidden;
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 14px;
    box-shadow: var(--shadow-md);
}

.tab-button {
    border-color: transparent;
    border-left: 3px solid transparent;
}

.tab-button:hover {
    color: var(--primary);
    background: var(--accent-soft);
}

.tab-button.active {
    color: var(--primary);
    background: linear-gradient(90deg, var(--accent-soft), #fff);
    border-left-color: var(--accent);
}

.step-number {
    color: var(--primary);
    background: var(--accent);
}

.tab-content-wrapper {
    padding: clamp(1.1rem, 4vw, 2.25rem);
}

.section-title {
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
}

.callout {
    background: linear-gradient(135deg, var(--accent-soft), #fffdf8);
    border-color: var(--accent);
}

.phrase-card,
.quiz-card,
.audio-recording-section {
    box-shadow: var(--shadow-sm);
}

.recording-indicator {
    color: #ffffff;
    background: var(--primary);
    border: 1px solid rgba(197, 160, 89, 0.45);
    border-radius: 999px;
}

.recording-dot {
    box-shadow: 0 0 0 5px rgba(229, 62, 62, 0.16);
}

.accordion-summary {
    color: var(--primary);
    background: #f8fafc;
}

/* Messages, settings and support */
.container,
.page {
    padding-top: clamp(1.5rem, 4vw, 3rem);
    padding-bottom: 4rem;
}

.messages-header,
.settings-header,
.page > .page-header {
    padding: clamp(1.25rem, 4vw, 2.3rem);
    border-radius: 14px;
}

.back-btn {
    width: 44px;
    height: 44px;
    padding: 0;
    flex: 0 0 44px;
}

.back-btn svg {
    fill: currentColor;
}

.notification-categories {
    gap: 1rem;
}

.category-button {
    border-top: 3px solid transparent;
}

.category-button.active {
    border-color: var(--accent);
    border-top-color: var(--accent);
    box-shadow: var(--shadow-gold);
}

.category-icon,
.message-icon {
    color: var(--primary);
    background: var(--accent-soft);
}

.category-icon svg,
.message-icon svg {
    fill: currentColor;
}

.message-card.unread {
    border-left-color: var(--accent);
    background: linear-gradient(90deg, var(--accent-soft), #ffffff 20%);
}

.settings-content,
.support-layout {
    gap: 1.25rem;
}

.settings-section.active {
    border-top: 4px solid var(--accent);
}

.gear-btn,
.modal-close {
    color: var(--primary);
    background: var(--accent);
    border: 1px solid var(--accent);
    border-radius: 8px;
}

.settings-menu,
.modal-content {
    border: 1px solid var(--border);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
}

.settings-nav li.active {
    color: var(--primary);
    background: var(--accent-soft);
    border-left-color: var(--accent);
}

.identity-card,
.support-form {
    border-top: 4px solid var(--accent);
}

.message-flow-icon {
    color: var(--primary);
    background: var(--accent);
}

/* Certificate verification */
body:has(> .card) {
    min-height: 100vh;
    height: auto;
    padding: 2rem 1rem;
    background:
        linear-gradient(rgba(5, 15, 29, 0.91), rgba(10, 26, 47, 0.95)),
        url('https://images.unsplash.com/photo-1454165804606-c3d57bc86b40?q=80&w=2070&auto=format&fit=crop') center / cover fixed;
}

body > .card {
    max-width: 560px;
    padding: clamp(1.5rem, 6vw, 3rem);
}

body > .card::before {
    width: 64px;
    height: 64px;
    margin: 0 auto 1rem;
    display: block;
    content: '';
    background: #ffffff url('../images/learn.png') center / contain no-repeat;
    border-radius: 12px;
}

/* Administration */
.sidebar {
    background:
        radial-gradient(circle at 20% 5%, rgba(197, 160, 89, 0.14), transparent 14rem),
        var(--primary-dark);
    border-right: 1px solid rgba(197, 160, 89, 0.55);
    box-shadow: 8px 0 30px rgba(5, 15, 29, 0.13);
}

.admin-brand {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.03);
    border-bottom: 1px solid rgba(197, 160, 89, 0.28);
    font-family: 'Playfair Display', Georgia, serif;
}

.admin-brand::before {
    width: 38px;
    height: 38px;
    margin-right: 0.65rem;
    display: inline-block;
    content: '';
    background: #ffffff url('../images/learn.png') center / contain no-repeat;
    border-radius: 7px;
    vertical-align: middle;
}

.admin-label {
    color: var(--accent);
}

.sidebar-nav a {
    border: 1px solid transparent;
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
    color: var(--primary);
    background: linear-gradient(135deg, var(--accent-light), var(--accent));
    border-color: var(--accent-light);
    box-shadow: 0 6px 16px rgba(197, 160, 89, 0.22);
}

.sidebar-footer a:hover {
    color: var(--accent);
}

.main {
    background:
        radial-gradient(circle at 96% 2%, rgba(197, 160, 89, 0.08), transparent 24rem),
        var(--bg-light);
}

.main .page-header {
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
}

.main .panel,
.notification-centre {
    border-top: 3px solid var(--accent);
}

.notification-heading {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-light));
}

.audio-filter a.active {
    color: var(--primary);
    background: var(--accent);
    border-color: var(--accent);
}

@media (max-width: 900px) {
    body > nav,
    .site-nav {
        padding-right: 1rem;
        padding-left: 1rem;
    }

    .site-nav.has-mobile-menu,
    body > nav.has-mobile-menu {
        position: sticky;
    }

    .has-mobile-menu .menu-toggle {
        display: flex;
        margin-left: auto;
    }

    .has-mobile-menu > .nav-actions,
    .has-mobile-menu > .nav-links {
        position: absolute;
        top: calc(100% + 1px);
        right: 1rem;
        left: 1rem;
        z-index: 1001;
        max-height: 0;
        padding: 0;
        display: grid;
        gap: 0.45rem;
        overflow: hidden;
        visibility: hidden;
        opacity: 0;
        color: var(--text-light);
        background: rgba(10, 26, 47, 0.98);
        border: 1px solid rgba(197, 160, 89, 0.35);
        border-top: 0;
        border-radius: 0 0 12px 12px;
        box-shadow: var(--shadow-lg);
        transform: translateY(-0.5rem);
        transition: max-height 0.3s ease, padding 0.3s ease, opacity 0.25s ease,
            transform 0.3s ease, visibility 0.3s ease;
    }

    .has-mobile-menu > .nav-actions.is-open,
    .has-mobile-menu > .nav-links.is-open {
        max-height: min(72vh, 38rem);
        padding: 0.85rem;
        overflow-y: auto;
        visibility: visible;
        opacity: 1;
        transform: translateY(0);
    }

    .has-mobile-menu > .nav-actions > a,
    .has-mobile-menu > .nav-links > a {
        width: 100%;
    }

    .layout-wrapper {
        grid-template-columns: 1fr;
    }

    .lesson-sidebar {
        position: static;
    }
}

@media (max-width: 620px) {
    body > nav .logo,
    .site-nav .brand,
    .site-nav .logo {
        min-height: 44px;
        padding-right: 0.75rem;
        font-size: 0.95rem;
    }

    body > nav .logo::before,
    .site-nav .brand::before,
    .site-nav .logo::before {
        width: 30px;
        height: 30px;
        flex-basis: 30px;
    }

    .auth-card,
    .payment-card {
        padding: 1.4rem;
        border-radius: 12px;
    }

    .dashboard,
    .container,
    .page {
        padding-right: 1rem;
        padding-left: 1rem;
    }

    .welcome-panel,
    .unit-header,
    .messages-header,
    .settings-header,
    .page > .page-header {
        border-radius: 0 0 14px 14px;
    }

    .sidebar {
        border-bottom-color: var(--accent);
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
    }
}