:root {
    --color-primary: #4f46e5;
    --color-primary-strong: #4338ca;
    --color-primary-soft: #e0e7ff;
    --color-secondary: #0f172a;
    --color-secondary-soft: #e2e8f0;
    --color-success: #15803d;
    --color-success-soft: #dcfce7;
    --color-danger: #dc2626;
    --color-danger-soft: #fee2e2;
    --color-warning: #b45309;
    --color-warning-soft: #fef3c7;
    --color-info: #1d4ed8;
    --color-info-soft: #dbeafe;
    --color-background: #f8fafc;
    --color-surface: #ffffff;
    --color-surface-muted: #f8fafc;
    --color-border: #e2e8f0;
    --color-border-strong: #cbd5e1;
    --color-text: #0f172a;
    --color-text-muted: #64748b;
    --shadow-sm: 0 8px 24px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 14px 36px rgba(15, 23, 42, 0.08);
    --shadow-lg: 0 24px 54px rgba(15, 23, 42, 0.16);
    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 22px;
    --container: 1280px;
    --container-narrow: 1120px;
    --container-auth: 560px;
    --space-xs: 8px;
    --space-sm: 12px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    display: flex;
    flex-direction: column;
    background: linear-gradient(180deg, #f8fafc 0%, #eef2ff 100%);
    color: var(--color-text);
    font-family: 'Inter', Arial, Helvetica, sans-serif;
    line-height: 1.5;
    min-height: 100vh;
}

img {
    max-width: 100%;
    display: block;
}

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

a {
    color: inherit;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.container {
    width: min(100%, var(--container));
    margin: 0 auto;
    padding: 0 28px;
}

.page-shell,
.panel-shell {
    width: min(100%, var(--container-narrow));
    margin: 0 auto;
    padding: 0 28px;
}

.app-container {
    flex: 1;
    padding: 40px 0 56px;
}

.section {
    width: min(100%, var(--container));
    margin: 72px auto;
    padding: 0 28px;
}

.section h1 {
    font-size: clamp(2rem, 3vw, 2.5rem);
    margin-bottom: 24px;
}

.section h2 {
    font-size: clamp(1.65rem, 2.4vw, 2rem);
    margin-bottom: 22px;
}

.main-header {
    position: sticky;
    top: 0;
    z-index: 30;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(226, 232, 240, 0.9);
}

.header-content {
    min-height: 78px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.header-tools {
    display: none;
    align-items: center;
    gap: 12px;
    margin-left: auto;
}

.header-menu-toggle {
    display: none;
    width: 46px;
    height: 46px;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 4px;
    border: 1px solid var(--color-border);
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.95);
    box-shadow: var(--shadow-sm);
    cursor: pointer;
}

.header-menu-toggle span {
    width: 18px;
    height: 2px;
    border-radius: 999px;
    background: var(--color-text);
}

.header-panel {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    flex: 1;
    min-width: 0;
}

.header-overlay,
.header-mobile-drawer {
    display: none;
}

.logo {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--color-primary);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 18px;
    flex-wrap: wrap;
}

.main-nav a {
    text-decoration: none;
    color: var(--color-text);
    font-weight: 600;
    opacity: 0.82;
    transition: opacity .2s ease, color .2s ease;
    white-space: nowrap;
}

.main-nav a:hover {
    opacity: 1;
    color: var(--color-primary);
}

.main-nav a.is-current {
    opacity: 1;
    color: var(--color-primary);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.header-link {
    text-decoration: none;
    color: var(--color-text);
    font-weight: 700;
}

.header-link:hover {
    color: var(--color-primary);
}

.user-menu {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 14px;
    border: 1px solid var(--color-border);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.9);
}

.user-menu__identity {
    display: grid;
    gap: 2px;
}

.user-menu span {
    font-weight: 600;
    white-space: nowrap;
}

.user-menu small {
    display: none;
}

.user-menu form button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 34px;
    padding: 6px 12px;
    border-radius: 999px;
    background: var(--color-primary-soft);
    border: 1px solid transparent;
    color: var(--color-primary-strong);
    font-weight: 700;
    cursor: pointer;
}

.cart-icon {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border-radius: 999px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    text-decoration: none;
    box-shadow: var(--shadow-sm);
}

.cart-icon--mobile {
    display: none;
}

.cart-icon--desktop {
    display: inline-flex;
}

.cart-badge {
    position: absolute;
    top: -5px;
    right: -6px;
    background: var(--color-primary);
    color: #fff;
    font-size: 11px;
    min-width: 20px;
    height: 20px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 6px;
    border-radius: 999px;
    font-weight: 700;
}

.search-section {
    padding: 72px 28px;
    background: linear-gradient(135deg, #eef2ff, #f8fafc);
}

.search-section.dark {
    background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-primary) 100%);
    color: #fff;
}

.search-wrapper {
    width: min(100%, 760px);
    margin: 0 auto;
    text-align: center;
}

.search-wrapper--catalog {
    width: min(100%, 1120px);
}

.search-section h1,
.search-section h2 {
    margin-bottom: 12px;
}

.search-section p {
    margin-bottom: 24px;
    font-size: 1rem;
    opacity: 0.92;
}

.search-box {
    width: 100%;
    max-width: 680px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 12px;
}

.search-box input {
    width: 100%;
    padding: 16px 18px;
    border-radius: 999px;
    border: 1px solid rgba(203, 213, 225, 0.9);
    font-size: 1rem;
    background: rgba(255, 255, 255, 0.95);
    box-shadow: var(--shadow-sm);
}

.search-box input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.12);
}

.search-box__button {
    flex: 0 0 auto;
    min-height: 54px;
    padding: 0 24px;
    border: 0;
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.92);
    color: #fff;
    font-size: 0.95rem;
    font-weight: 800;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: transform .2s ease, background .2s ease;
}

.search-box__button:hover {
    transform: translateY(-1px);
    background: rgba(15, 23, 42, 1);
}

.search-box__hint {
    margin-top: 14px;
    margin-bottom: 0;
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.82);
}

.btn-primary,
.btn-secondary,
.btn-danger,
.btn-ghost {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 46px;
    padding: 12px 18px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 700;
    cursor: pointer;
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease, border-color .2s ease;
    border: 1px solid transparent;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-strong));
    color: #fff;
    box-shadow: 0 10px 24px rgba(79, 70, 229, 0.22);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 16px 30px rgba(79, 70, 229, 0.28);
}

.btn-secondary {
    background: linear-gradient(135deg, #eef2ff 0%, #e0e7ff 100%);
    color: var(--color-primary-strong);
    border-color: #c7d2fe;
    box-shadow: 0 10px 24px rgba(79, 70, 229, 0.12);
}

.btn-secondary:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: linear-gradient(135deg, #e0e7ff 0%, #c7d2fe 100%);
}

.btn-danger {
    background: linear-gradient(135deg, var(--color-danger), #b91c1c);
    color: #fff;
}

.btn-danger[disabled],
.btn-danger.is-disabled {
    opacity: .55;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

.btn-ghost {
    background: rgba(79, 70, 229, 0.08);
    color: var(--color-primary-strong);
    border-color: rgba(79, 70, 229, 0.18);
}

.btn-ghost:hover {
    background: rgba(79, 70, 229, 0.14);
    color: var(--color-primary);
}

.alert,
.status-inline,
.status-box,
.error-box,
.warning-box,
.info-box {
    border-radius: 14px;
    padding: 14px 16px;
    font-size: 14px;
    border: 1px solid transparent;
}

.alert-success,
.status-inline,
.status-box {
    background: var(--color-success-soft);
    border-color: #bbf7d0;
    color: var(--color-success);
}

.alert-error,
.error-box {
    background: var(--color-danger-soft);
    border-color: #fecaca;
    color: #b91c1c;
}

.warning-box {
    background: var(--color-warning-soft);
    border-color: #fde68a;
    color: var(--color-warning);
}

.info-box {
    background: var(--color-info-soft);
    border-color: #bfdbfe;
    color: var(--color-info);
}

.alert-list {
    margin-top: 10px;
    padding-left: 18px;
    display: grid;
    gap: 4px;
}

.panel-hero {
    margin-bottom: 28px;
}

.panel-title {
    font-size: clamp(2rem, 3vw, 2.5rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 8px;
}

.panel-subtitle {
    color: var(--color-text-muted);
    max-width: 720px;
}

.panel-grid {
    display: grid;
    gap: 24px;
}

.stack-md {
    display: grid;
    gap: 16px;
}

.stack-lg {
    display: grid;
    gap: 24px;
}

.panel-card,
.surface-card {
    background: rgba(255, 255, 255, 0.94);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 28px;
    box-shadow: var(--shadow-md);
}

.panel-card h2,
.surface-card h2 {
    font-size: 1.35rem;
    margin-bottom: 8px;
}

.panel-card p,
.surface-card p {
    color: var(--color-text-muted);
}

.form-stack {
    display: grid;
    gap: 18px;
    margin-top: 22px;
}

.form-group {
    display: grid;
    gap: 8px;
}

.form-group label {
    font-size: 14px;
    font-weight: 700;
    color: var(--color-text);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 14px 16px;
    border-radius: 12px;
    border: 1px solid var(--color-border-strong);
    background: var(--color-surface);
    color: var(--color-text);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.12);
}

.form-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    flex-wrap: wrap;
}

.modal-card {
    display: grid;
    gap: 18px;
    padding: 28px;
    border-radius: 24px;
    background: rgba(255, 255, 255, 0.98);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
}

.modal-card__eyebrow {
    display: inline-flex;
    width: fit-content;
    min-height: 32px;
    align-items: center;
    padding: 6px 12px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: .06em;
}

.modal-card__eyebrow--danger {
    background: var(--color-danger-soft);
    color: #b91c1c;
}

.modal-card__title {
    font-size: 1.55rem;
    line-height: 1.2;
}

.modal-card__description {
    color: var(--color-text-muted);
    line-height: 1.7;
}

.modal-card__actions {
    margin-top: 4px;
}

.confirm-check {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 14px 16px;
    border-radius: 16px;
    background: var(--color-surface-muted);
    border: 1px solid var(--color-border);
    color: var(--color-text);
    cursor: pointer;
}

.confirm-check input {
    width: 18px;
    height: 18px;
    margin-top: 2px;
    accent-color: var(--color-danger);
    flex-shrink: 0;
}

.confirm-check span {
    color: var(--color-text-muted);
    line-height: 1.6;
}

.confirm-modal {
    position: fixed;
    inset: 0;
    z-index: 60;
    display: none;
    place-items: center;
    padding: 24px;
}

.confirm-modal.is-open {
    display: grid;
}

.confirm-modal__backdrop {
    position: absolute;
    inset: 0;
    background: rgba(15, 23, 42, 0.6);
}

.confirm-modal__dialog {
    position: relative;
    width: min(100%, 640px);
    z-index: 1;
}

.muted-link,
.auth-link,
.back-link {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 700;
}

.muted-link:hover,
.auth-link:hover,
.back-link:hover {
    text-decoration: underline;
}

.courses-grid {
    display: grid;
    gap: 24px;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

.course-card {
    position: relative;
    background: rgba(255, 255, 255, 0.96);
    border-radius: 18px;
    overflow: hidden;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    transition: transform .2s ease, box-shadow .2s ease;
}

.course-ribbon {
    position: absolute;
    top: 18px;
    left: 0;
    right: 0;
    z-index: 2;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 36px;
    padding: 8px 14px;
    border-radius: 0;
    background: linear-gradient(135deg, #ef4444, #dc2626);
    color: #fff;
    font-size: 12px;
    font-weight: 800;
    letter-spacing: .04em;
    text-transform: uppercase;
    box-shadow: 0 12px 24px rgba(220, 38, 38, 0.28);
}

.course-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 18px 36px rgba(15, 23, 42, 0.12);
}

.course-card img {
    width: 100%;
    height: 190px;
    object-fit: cover;
}

.course-content {
    padding: 18px;
    display: flex;
    flex-direction: column;
    flex: 1;
    gap: 10px;
}

.course-card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 10px;
}

.course-card-tag,
.course-card-rating {
    display: inline-flex;
    align-items: center;
    min-height: 28px;
    padding: 6px 10px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 700;
}

.course-card-tag {
    background: rgba(79, 70, 229, 0.1);
    color: var(--color-primary-strong);
}

.course-card-rating {
    background: rgba(249, 115, 22, 0.12);
    color: #c2410c;
}

.course-content h3 {
    font-size: 17px;
    font-weight: 700;
    margin: 0;
}

.course-content p {
    font-size: 14px;
    color: var(--color-text-muted);
    margin: 0;
}

.course-card-instructors {
    display: block;
    color: var(--color-text-muted);
}

.course-card-title {
    min-height: 56px;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
    overflow: hidden;
}

.course-card-description {
    min-height: 66px;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 3;
    overflow: hidden;
}

.course-card-footer {
    margin-top: auto;
    display: grid;
    gap: 14px;
    padding-top: 8px;
}

.course-card .price {
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--color-primary);
}

.course-card .price small {
    display: block;
    font-size: 13px;
    color: var(--color-text-muted);
    text-decoration: line-through;
}

.course-card .btn-primary {
    width: 100%;
}

.instructors-grid {
    display: grid;
    gap: 24px;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

.instructor-card {
    background: rgba(255, 255, 255, 0.96);
    border-radius: 18px;
    overflow: hidden;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    transition: transform .2s ease, box-shadow .2s ease;
}

.instructor-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 18px 36px rgba(15, 23, 42, 0.12);
}

.instructor-card__media {
    position: relative;
    height: 220px;
    background: linear-gradient(135deg, #dbeafe, #e0e7ff);
}

.instructor-card__media img,
.instructor-card__avatar {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.instructor-card__avatar {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    font-weight: 800;
    color: var(--color-primary-strong);
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.16), rgba(14, 165, 233, 0.14));
}

.instructor-card__badge {
    position: absolute;
    top: 14px;
    right: 14px;
    display: inline-flex;
    align-items: center;
    min-height: 28px;
    padding: 6px 10px;
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.78);
    color: #fff;
    font-size: 11px;
    font-weight: 800;
    letter-spacing: .02em;
}

.instructor-card__content {
    padding: 18px;
    display: flex;
    flex-direction: column;
    flex: 1;
    gap: 10px;
}

.instructor-card__meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    flex-wrap: wrap;
}

.instructor-card__tag,
.instructor-card__count {
    display: inline-flex;
    align-items: center;
    min-height: 28px;
    padding: 6px 10px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 700;
}

.instructor-card__tag {
    background: rgba(79, 70, 229, 0.1);
    color: var(--color-primary-strong);
}

.instructor-card__count {
    background: rgba(14, 165, 233, 0.12);
    color: #0369a1;
}

.instructor-card__title {
    font-size: 1.05rem;
    font-weight: 800;
    line-height: 1.3;
}

.instructor-card__headline {
    color: var(--color-text-muted);
    font-size: 14px;
    min-height: 64px;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 3;
    overflow: hidden;
}

.instructor-card__courses {
    color: var(--color-text-muted);
    display: block;
    min-height: 40px;
}

.instructor-card__footer {
    margin-top: auto;
    padding-top: 8px;
}

.instructor-card__footer .btn-primary {
    width: 100%;
}

.page-section {
    width: min(100%, var(--container-narrow));
    margin: 0 auto;
    padding: 12px 28px 0;
}

.page-header {
    margin-bottom: 24px;
}

.page-header h1 {
    font-size: clamp(2rem, 3vw, 2.5rem);
    margin-bottom: 8px;
}

.page-header p {
    color: var(--color-text-muted);
}

.surface-list {
    display: grid;
    gap: 16px;
}

.surface-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 18px;
    padding: 18px;
    background: rgba(255, 255, 255, 0.96);
    border: 1px solid var(--color-border);
    border-radius: 18px;
    box-shadow: var(--shadow-sm);
}

.surface-item-main {
    display: flex;
    align-items: center;
    gap: 16px;
    min-width: 0;
}

.surface-item-meta h2,
.surface-item-meta h3 {
    font-size: 1.1rem;
    margin-bottom: 6px;
}

.surface-item-meta small,
.surface-item-meta p {
    color: var(--color-text-muted);
}

.surface-item-thumb {
    width: 120px;
    height: 74px;
    object-fit: cover;
    border-radius: 12px;
    flex-shrink: 0;
}

.surface-item-side {
    text-align: right;
}

.price-strong {
    font-size: 1.1rem;
    font-weight: 800;
}

.price-xl {
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-primary);
}

.summary-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
    padding: 22px;
    background: rgba(255, 255, 255, 0.98);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    box-shadow: var(--shadow-md);
}

.summary-card p,
.summary-card small {
    color: var(--color-text-muted);
}

.summary-total {
    display: grid;
    gap: 6px;
}

.detail-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.65fr) minmax(320px, 420px);
    gap: 28px;
    align-items: start;
}

.detail-main,
.detail-sidebar,
.detail-block {
    background: rgba(255, 255, 255, 0.96);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    box-shadow: var(--shadow-md);
}

.detail-main,
.detail-sidebar {
    padding: 26px;
}

.detail-main h1 {
    font-size: clamp(2rem, 3vw, 2.5rem);
    margin-bottom: 12px;
}

.detail-kicker-row {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 14px;
}

.detail-kicker {
    display: inline-flex;
    align-items: center;
    min-height: 34px;
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(79, 70, 229, 0.1);
    color: var(--color-primary-strong);
    font-size: 13px;
    font-weight: 800;
}

.detail-kicker--muted {
    background: rgba(249, 115, 22, 0.12);
    color: #c2410c;
}

.detail-instructors {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 18px;
    color: var(--color-text-muted);
}

.detail-description {
    color: var(--color-text-muted);
    margin-bottom: 24px;
    line-height: 1.7;
}

.detail-description-wrap {
    display: grid;
    gap: 12px;
}

.detail-content-stack {
    display: grid;
    gap: 28px;
    margin-top: 28px;
}

.detail-block {
    padding: 20px;
}

.detail-block + .detail-block {
    margin-top: 16px;
}

.detail-block h3 {
    margin-bottom: 8px;
}

.detail-block p,
.detail-block li {
    color: var(--color-text-muted);
}

.detail-list {
    list-style: disc;
    padding-left: 18px;
    display: grid;
    gap: 6px;
}

.clamped-copy {
    color: var(--color-text-muted);
    line-height: 1.8;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 10;
    overflow: hidden;
}

.clamped-copy.is-expanded,
.clamped-copy.is-short {
    display: block;
    -webkit-line-clamp: unset;
    overflow: visible;
}

.detail-sidebar {
    position: sticky;
    top: 96px;
}

.detail-cover {
    width: 100%;
    border-radius: 16px;
    margin-bottom: 18px;
    box-shadow: var(--shadow-sm);
}

.price-stack {
    display: grid;
    gap: 8px;
    margin: 20px 0;
    padding: 22px 20px;
    text-align: center;
    justify-items: center;
    border: 1px solid var(--color-border);
    border-radius: 18px;
    background: rgba(248, 250, 252, 0.95);
}

.detail-sidebar-meta {
    display: grid;
    gap: 12px;
    margin-bottom: 18px;
}

.detail-sidebar-meta__item {
    display: grid;
    gap: 4px;
    padding: 14px 16px;
    border: 1px solid var(--color-border);
    border-radius: 16px;
    background: rgba(248, 250, 252, 0.95);
}

.detail-sidebar-meta__item strong {
    color: #0f172a;
}

.detail-sidebar-meta__item span {
    color: var(--color-text-muted);
}

.price-old {
    color: var(--color-text-muted);
    text-decoration: line-through;
    font-weight: 600;
}

.action-stack {
    display: grid;
    gap: 12px;
}

.action-stack form {
    width: 100%;
}

.action-stack .btn-primary,
.action-stack .btn-secondary,
.action-stack button {
    width: 100%;
}

.overview-metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
}

.overview-metric {
    display: grid;
    gap: 6px;
    padding: 20px;
    border-radius: 18px;
    border: 1px solid var(--color-border);
    background: rgba(248, 250, 252, 0.95);
}

.overview-metric strong {
    font-size: 1.5rem;
    color: var(--color-primary-strong);
}

.overview-metric span {
    color: var(--color-text-muted);
    font-size: 14px;
}

.catalog-filter-chips {
    margin-top: 22px;
    padding: 10px;
    border-radius: 22px;
    background: rgba(255, 255, 255, 0.08);
    overflow-x: auto;
    overflow-y: hidden;
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.32) transparent;
}

.catalog-filter-chips::-webkit-scrollbar {
    height: 8px;
}

.catalog-filter-chips::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.28);
    border-radius: 999px;
}

.catalog-filter-track {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    min-width: max-content;
}

.catalog-filter-chip {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
    min-height: 38px;
    padding: 9px 14px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.18);
    color: rgba(255, 255, 255, 0.92);
    text-decoration: none;
    font-weight: 700;
    transition: background .2s ease, transform .2s ease, border-color .2s ease;
}

.catalog-filter-chip small {
    margin-left: 6px;
    opacity: .82;
}

.catalog-filter-chips--home {
    margin-bottom: 32px;
    padding: 14px;
    border: 1px solid rgba(199, 210, 254, 0.55);
    background:
        radial-gradient(circle at top right, rgba(99, 102, 241, 0.14), transparent 34%),
        linear-gradient(135deg, rgba(238, 242, 255, 0.92), rgba(255, 255, 255, 0.98));
    box-shadow: 0 18px 38px rgba(148, 163, 184, 0.14);
}

.catalog-filter-chips--home .catalog-filter-chip {
    min-height: 44px;
    padding: 10px 16px;
    background: rgba(255, 255, 255, 0.94);
    border: 1px solid rgba(199, 210, 254, 0.82);
    color: #312e81;
    box-shadow: 0 10px 24px rgba(99, 102, 241, 0.08);
}

.catalog-filter-chips--home .catalog-filter-chip small {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 24px;
    height: 24px;
    margin-left: 8px;
    padding: 0 7px;
    border-radius: 999px;
    background: rgba(79, 70, 229, 0.1);
    color: #4338ca;
    opacity: 1;
    font-size: 12px;
    font-weight: 800;
}

.catalog-filter-chips--home .catalog-filter-chip:hover {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.16), rgba(79, 70, 229, 0.1));
    border-color: rgba(99, 102, 241, 0.4);
    color: #1e1b4b;
    transform: translateY(-1px);
}

.catalog-toolbar {
    margin-bottom: 24px;
}

.catalog-toolbar__form {
    display: flex;
    align-items: end;
    gap: 16px;
    flex-wrap: wrap;
}

.catalog-toolbar__form .form-group {
    min-width: 180px;
    flex: 1 1 180px;
}

.instructor-hero {
    display: grid;
    grid-template-columns: 170px minmax(0, 1fr);
    align-items: start;
    gap: 20px;
    padding: 32px;
    background:
        radial-gradient(circle at top right, rgba(249, 115, 22, 0.16), transparent 28%),
        linear-gradient(135deg, rgba(255, 255, 255, 0.98), rgba(255, 247, 237, 0.9));
}

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

.instructor-hero__photo-wrap {
    position: relative;
    width: 150px;
}

.instructor-hero__photo,
.instructor-hero__avatar {
    width: 150px;
    aspect-ratio: 3 / 4;
    min-height: 200px;
    border-radius: 18px;
    object-fit: cover;
    box-shadow: var(--shadow-md);
}

.instructor-hero__avatar {
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-strong));
    color: #fff;
    font-size: 48px;
    font-weight: 800;
}

.instructor-hero__copy {
    display: grid;
    gap: 14px;
}

.instructor-hero__headline {
    display: flex;
    justify-content: flex-start;
    align-items: center;
    gap: 12px;
}

.instructor-stats-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
}

.instructor-stat-card,
.instructor-insight-card {
    display: grid;
    gap: 8px;
}

.instructor-stat-card {
    padding: 24px;
    border: 1px solid rgba(226, 232, 240, 0.92);
    background:
        radial-gradient(circle at top right, rgba(59, 130, 246, 0.10), transparent 34%),
        linear-gradient(180deg, rgba(255,255,255,0.98) 0%, rgba(248,250,252,0.96) 100%);
}

.instructor-card-label,
.instructor-section-label {
    display: inline-flex;
    width: fit-content;
    min-height: 28px;
    align-items: center;
    padding: 4px 10px;
    border-radius: 999px;
    background: rgba(79, 70, 229, 0.10);
    color: var(--color-primary-strong);
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.instructor-stat-card strong {
    font-size: clamp(1.8rem, 3vw, 2.3rem);
    color: #1e3a8a;
    line-height: 1;
}

.instructor-stat-card span,
.instructor-insight-card p {
    color: var(--color-text-muted);
}

.instructor-insights-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
}

.instructor-insight-card {
    padding: 28px;
    border: 1px solid rgba(226, 232, 240, 0.92);
    background:
        radial-gradient(circle at top left, rgba(249, 115, 22, 0.10), transparent 30%),
        linear-gradient(180deg, rgba(255,255,255,0.98) 0%, rgba(248,250,252,0.96) 100%);
}

.instructor-insight-card h2 {
    margin: 0;
    font-size: clamp(1.5rem, 2.4vw, 2rem);
    line-height: 1.15;
}

.instructor-expertise-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: flex-start;
    margin-top: 8px;
}

.instructor-expertise-chip {
    display: inline-flex;
    width: fit-content;
    min-height: 38px;
    align-items: center;
    padding: 8px 14px;
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.06);
    border: 1px solid rgba(148, 163, 184, 0.18);
    color: #0f172a;
    font-size: 0.95rem;
    font-weight: 700;
}

.instructor-proof-list {
    display: grid;
    gap: 14px;
    margin-top: 6px;
}

.instructor-proof-list div {
    display: grid;
    gap: 6px;
    padding: 18px 18px;
    border-radius: 18px;
    background: rgba(248, 250, 252, 0.88);
    border: 1px solid rgba(148, 163, 184, 0.18);
}

.instructor-proof-list strong {
    color: #0f172a;
    font-size: 1.25rem;
}

.instructor-proof-list span {
    color: var(--color-text-muted);
    line-height: 1.55;
}

.instructor-verified-badge {
    position: absolute;
    right: -6px;
    bottom: -6px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 999px;
    background: linear-gradient(135deg, #2563eb, #1d4ed8);
    color: #fff;
    font-size: 15px;
    font-weight: 800;
    box-shadow: 0 12px 24px rgba(29, 78, 216, 0.28);
    border: 4px solid #fff;
}

.catalog-filter-chip:hover {
    background: rgba(255, 255, 255, 0.18);
    transform: translateY(-1px);
}

.catalog-filter-chip.is-active {
    background: #fff;
    color: #1f2937;
    border-color: #fff;
    box-shadow: 0 10px 20px rgba(15, 23, 42, 0.18);
}

.certificate-verify-card {
    display: grid;
    gap: 24px;
    padding: 32px;
    border-radius: 28px;
    border: 1px solid rgba(226, 232, 240, 0.92);
    background:
        radial-gradient(circle at top right, rgba(34, 197, 94, 0.12), transparent 28%),
        linear-gradient(135deg, rgba(255, 255, 255, 0.98), rgba(240, 253, 244, 0.92));
    box-shadow: var(--shadow-md);
}

.certificate-verify-card__status {
    display: grid;
    gap: 10px;
}

.certificate-verify-card__status strong {
    font-size: clamp(1.4rem, 2.8vw, 2rem);
    color: #0f172a;
}

.certificate-verify-card__badge {
    display: inline-flex;
    width: fit-content;
    min-height: 32px;
    align-items: center;
    padding: 6px 12px;
    border-radius: 999px;
    background: rgba(34, 197, 94, 0.12);
    color: #15803d;
    font-size: 12px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: .06em;
}

.certificate-verify-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
}

.certificate-verify-grid small {
    display: block;
    margin-bottom: 4px;
    color: var(--color-text-muted);
    font-size: 12px;
}

.certificate-verify-grid strong {
    color: #0f172a;
    font-size: 15px;
}

.certificate-verify-copy {
    padding-top: 6px;
    color: var(--color-text-muted);
    line-height: 1.7;
}

@media (max-width: 768px) {
    .instructor-hero {
        grid-template-columns: 1fr;
    }

    .instructor-stats-grid,
    .instructor-insights-grid {
        grid-template-columns: 1fr;
    }

    .instructor-hero__media {
        justify-content: center;
    }

    .instructor-hero__photo-wrap {
        width: min(100%, 170px);
    }

    .instructor-hero__photo,
    .instructor-hero__avatar {
        width: 100%;
    }
}

@media (max-width: 768px) {
    .search-wrapper--catalog {
        width: 100%;
    }

    .catalog-filter-chips {
        margin-top: 18px;
        padding: 8px;
        border-radius: 18px;
    }

    .catalog-toolbar__form {
        align-items: stretch;
    }

    .catalog-filter-chip {
        min-height: 36px;
        padding: 8px 12px;
        font-size: 13px;
    }
}

.form-inline {
    display: flex;
    align-items: end;
    gap: 14px;
    flex-wrap: wrap;
}

.rating-stars-form {
    display: grid;
    gap: 8px;
    margin-bottom: 14px;
}

.rating-stars {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.rating-star {
    border: none;
    background: transparent;
    color: #cbd5e1;
    font-size: 24px;
    line-height: 1;
    cursor: pointer;
    padding: 0;
}

.rating-star.is-active,
.rating-star:hover {
    color: #f59e0b;
}

.rating-caption {
    color: var(--color-text-muted);
}

.catalog-accordion {
    display: grid;
    gap: 14px;
}

.catalog-section {
    border: 1px solid var(--color-border);
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.96);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.catalog-section-toggle {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 18px 20px;
    background: transparent;
    border: none;
    cursor: pointer;
    text-align: left;
}

.catalog-section-toggle strong {
    display: block;
    margin-bottom: 4px;
}

.catalog-section-toggle small,
.catalog-section-toggle span:last-child {
    color: var(--color-text-muted);
}

.catalog-section-body {
    display: none;
    padding: 0 20px 20px;
    border-top: 1px solid var(--color-border);
}

.catalog-section.is-open .catalog-section-body {
    display: block;
}

.catalog-section-description {
    color: var(--color-text-muted);
    margin: 16px 0;
}

.catalog-lesson-list {
    list-style: none;
    display: grid;
    gap: 12px;
}

.catalog-lesson-list li {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 14px 0;
    border-top: 1px solid #eef2f7;
}

.catalog-lesson-list li:first-child {
    border-top: none;
}

.catalog-lesson-list small,
.catalog-lesson-lock,
.catalog-preview-title {
    color: var(--color-text-muted);
}

.catalog-lesson-lock {
    font-size: 14px;
    font-weight: 600;
}

.btn-compact {
    min-height: 34px;
    padding: 8px 12px;
    font-size: 13px;
}

.btn-preview {
    min-width: 128px;
    white-space: nowrap;
}

.course-preview-frame {
    aspect-ratio: 16 / 9;
    width: 100%;
    border-radius: 14px;
    overflow: hidden;
    margin-bottom: 12px;
}

.course-preview-frame iframe {
    width: 100%;
    height: 100%;
    border: none;
}

.alert-wrap {
    margin-top: 20px;
    margin-bottom: 20px;
}

.pagination-shell {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    flex-wrap: wrap;
    padding: 18px 20px;
    border: 1px solid var(--color-border);
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.96);
    box-shadow: var(--shadow-sm);
}

.pagination-summary {
    color: var(--color-text-muted);
    font-size: 14px;
}

.pagination-nav {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.pagination-pages {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.pagination-link,
.pagination-page,
.pagination-ellipsis {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 40px;
    padding: 0 14px;
    border-radius: 12px;
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    text-decoration: none;
    color: var(--color-text);
    font-weight: 700;
    font-size: 14px;
}

.pagination-link {
    gap: 8px;
}

.pagination-link:hover,
.pagination-page:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.pagination-page {
    min-width: 40px;
    padding: 0 12px;
}

.pagination-page.is-current {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-strong));
    border-color: transparent;
    color: #fff;
    box-shadow: 0 10px 22px rgba(79, 70, 229, 0.18);
}

.pagination-link.is-disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pagination-ellipsis {
    color: var(--color-text-muted);
}

.pagination-arrow {
    font-size: 18px;
    line-height: 1;
}

.toast-stack {
    position: fixed;
    top: 96px;
    right: 24px;
    z-index: 120;
    width: min(100vw - 32px, 420px);
    display: grid;
    gap: 12px;
    pointer-events: none;
}

.toast {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 14px;
    padding: 16px 18px;
    border-radius: 18px;
    border: 1px solid transparent;
    box-shadow: var(--shadow-lg);
    background: rgba(255, 255, 255, 0.98);
    transform: translate3d(0, -12px, 0);
    opacity: 0;
    transition: opacity .22s ease, transform .22s ease;
    pointer-events: auto;
}

.toast.is-visible {
    opacity: 1;
    transform: translate3d(0, 0, 0);
}

.toast.is-hiding {
    opacity: 0;
    transform: translate3d(0, -10px, 0);
}

.toast-success {
    border-color: #bbf7d0;
    background: linear-gradient(135deg, #f0fdf4 0%, #ffffff 100%);
}

.toast-error {
    border-color: #fecaca;
    background: linear-gradient(135deg, #fff1f2 0%, #ffffff 100%);
}

.toast-body {
    display: grid;
    gap: 6px;
}

.toast-body strong {
    font-size: 15px;
}

.toast-body p {
    font-size: 14px;
    color: var(--color-text);
}

.toast-list {
    margin: 2px 0 0;
    padding-left: 18px;
    display: grid;
    gap: 4px;
    font-size: 14px;
}

.toast-close {
    width: 34px;
    height: 34px;
    flex: 0 0 34px;
    border: 0;
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.06);
    color: var(--color-text-muted);
    font-size: 22px;
    line-height: 1;
    cursor: pointer;
}

.toast-close:hover {
    background: rgba(15, 23, 42, 0.12);
    color: var(--color-text);
}

.certificate-sheet {
    background: linear-gradient(135deg, #fff, #eef2ff);
    border: 1px solid rgba(79, 70, 229, 0.18);
    border-radius: 28px;
    box-shadow: var(--shadow-lg);
    padding: 18px;
}

.certificate-sheet__inner {
    border: 2px solid rgba(79, 70, 229, 0.16);
    border-radius: 22px;
    padding: 48px 36px;
    text-align: center;
    display: grid;
    gap: 24px;
}

.certificate-kicker {
    font-size: 12px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: .16em;
    color: var(--color-primary);
}

.certificate-copy {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    max-width: 760px;
    margin: 0 auto;
    line-height: 1.8;
}

.certificate-meta,
.certificate-signatures {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 20px;
}

.certificate-meta small,
.certificate-signatures span {
    display: block;
    margin-bottom: 8px;
    color: var(--color-text-muted);
}

.certificate-meta strong,
.certificate-signatures strong {
    font-size: 1rem;
}

.auth-shell {
    width: min(100%, var(--container-auth));
    margin: 0 auto;
    padding: 0 28px;
}

.auth-card {
    background: rgba(255, 255, 255, 0.96);
    border: 1px solid var(--color-border);
    border-radius: 22px;
    padding: 30px;
    box-shadow: var(--shadow-lg);
}

.auth-title {
    font-size: clamp(2rem, 3vw, 2.3rem);
    font-weight: 800;
    margin-bottom: 8px;
}

.auth-subtitle {
    color: var(--color-text-muted);
    margin-bottom: 24px;
}

.auth-form {
    display: grid;
    gap: 18px;
}

.auth-group {
    display: grid;
    gap: 8px;
}

.auth-form label {
    font-size: 14px;
    font-weight: 700;
}

.auth-form input {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid var(--color-border-strong);
    border-radius: 12px;
    background: var(--color-surface);
}

.auth-form input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.12);
}

.auth-actions,
.auth-links {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
}

.auth-actions {
    justify-content: space-between;
}

.auth-help,
.auth-status,
.auth-error {
    border-radius: 14px;
    padding: 14px 16px;
    font-size: 14px;
}

.auth-help,
.auth-status {
    background: var(--color-info-soft);
    color: var(--color-info);
}

.auth-error {
    background: var(--color-danger-soft);
    color: #b91c1c;
}

.auth-note {
    border-radius: 14px;
    padding: 14px 16px;
    font-size: 14px;
    line-height: 1.6;
    background: #fff7ed;
    border: 1px solid #fdba74;
    color: #9a3412;
}

.auth-note a,
.site-footer__links a {
    color: inherit;
    font-weight: 700;
    text-decoration: none;
}

.auth-note a:hover,
.site-footer__links a:hover {
    text-decoration: underline;
}

.auth-check {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--color-text-muted);
}

.auth-check input {
    width: auto;
}

footer {
    margin-top: 72px;
    padding: 34px 24px;
    text-align: center;
    background: #0f172a;
    color: #94a3b8;
}

.site-footer .container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px 24px;
    flex-wrap: wrap;
}

.site-footer__links {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    justify-content: center;
}

.legal-shell {
    width: min(100%, 1180px);
}

.legal-card {
    width: 100%;
    max-width: none;
    padding: 36px 40px;
}

.legal-content {
    display: grid;
    gap: 18px;
    text-align: left;
}

.legal-content h2 {
    margin: 0;
    font-size: 18px;
}

.legal-content p {
    margin: 0;
    color: var(--color-text-muted);
    line-height: 1.7;
}

.home-search-feedback,
.catalog-active-filters {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 16px;
}

.home-search-feedback {
    justify-content: center;
    padding: 14px 18px;
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.14);
}

.home-search-feedback span,
.catalog-active-filters__label {
    font-size: 12px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    font-weight: 800;
}

.home-search-feedback strong,
.catalog-active-filter {
    display: inline-flex;
    align-items: center;
    min-height: 34px;
    padding: 8px 14px;
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.06);
    color: var(--color-text);
    font-size: 13px;
    font-weight: 700;
}

.home-search-feedback small {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.84);
}

.home-search-feedback a {
    color: #fff;
    font-weight: 700;
}

.catalog-empty-state {
    grid-column: 1 / -1;
    display: grid;
    gap: 10px;
    padding: 28px;
    border: 1px dashed var(--color-border-strong);
    border-radius: 22px;
    background: linear-gradient(180deg, rgba(255,255,255,0.9) 0%, rgba(248,250,252,0.96) 100%);
    text-align: center;
}

.catalog-empty-state strong {
    font-size: 1.1rem;
}

.course-card-tag--soft {
    background: rgba(15, 23, 42, 0.06);
    color: #334155;
}

.checkout-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.6fr) minmax(320px, 0.9fr);
    gap: 22px;
    align-items: start;
}

.checkout-item {
    border-radius: 20px;
    background: linear-gradient(180deg, rgba(255,255,255,0.98) 0%, rgba(248,250,252,1) 100%);
}

.checkout-item__eyebrow {
    display: inline-block;
    margin-bottom: 8px;
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: #2563eb;
}

.checkout-summary-card {
    position: sticky;
    top: 28px;
    border: 1px solid rgba(37, 99, 235, 0.14);
    box-shadow: 0 24px 50px rgba(15, 23, 42, 0.08);
}

.checkout-confidence-list {
    display: grid;
    gap: 12px;
    margin: 18px 0 24px;
}

.checkout-confidence-list article {
    display: grid;
    gap: 4px;
    padding: 14px 16px;
    border-radius: 16px;
    background: rgba(37, 99, 235, 0.06);
}

.checkout-confidence-list strong {
    font-size: 0.95rem;
}

.checkout-confidence-list span {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

@media (max-width: 900px) {
    body.header-menu-open {
        overflow: hidden;
    }

    .header-content {
        min-height: 74px;
        padding: 14px 0;
        position: relative;
    }

    .header-tools {
        display: flex;
    }

    .site-footer .container,
    .site-footer__links {
        flex-direction: column;
    }

    .legal-card {
        padding: 28px 22px;
    }

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

    .checkout-summary-card {
        position: static;
    }

    .header-menu-toggle {
        display: inline-flex;
    }

    .header-panel {
        display: none;
    }

    .header-overlay {
        position: fixed;
        inset: 0;
        z-index: 40;
        border: 0;
        background: rgba(15, 23, 42, 0.38);
        backdrop-filter: blur(3px);
    }

    body.header-menu-open .header-overlay {
        display: block;
    }

    .header-mobile-drawer {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        width: min(86vw, 340px);
        display: flex;
        flex-direction: column;
        align-items: stretch;
        gap: 18px;
        padding: 20px 20px 28px;
        border-right: 1px solid var(--color-border);
        border-radius: 0 24px 24px 0;
        background:
            radial-gradient(circle at top right, rgba(99, 102, 241, 0.08), transparent 36%),
            rgba(255, 255, 255, 0.99);
        box-shadow: 0 24px 60px rgba(15, 23, 42, 0.22);
        transform: translateX(-100%);
        transition: transform .24s ease;
        z-index: 41;
        overflow-y: auto;
    }

    .header-mobile-drawer.is-open {
        transform: translateX(0);
    }

    .header-mobile-drawer__head {
        display: flex;
        align-items: flex-start;
        justify-content: space-between;
        gap: 14px;
        padding-bottom: 16px;
        border-bottom: 1px solid rgba(226, 232, 240, 0.95);
    }

    .header-mobile-drawer__welcome {
        display: grid;
        gap: 4px;
    }

    .header-mobile-drawer__welcome strong {
        font-size: 22px;
        line-height: 1.2;
        color: #0f172a;
    }

    .header-mobile-drawer__welcome span {
        color: var(--color-text-muted);
        font-size: 14px;
    }

    .header-mobile-drawer__close {
        display: inline-grid;
        place-items: center;
        width: 42px;
        height: 42px;
        border: 1px solid var(--color-border);
        border-radius: 999px;
        background: rgba(255, 255, 255, 0.96);
        color: var(--color-text);
        font-size: 26px;
        line-height: 1;
        cursor: pointer;
        box-shadow: 0 10px 20px rgba(148, 163, 184, 0.14);
    }

    .header-mobile-nav {
        display: flex;
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
        width: 100%;
    }

    .header-mobile-nav__group {
        display: grid;
        gap: 8px;
        margin-top: 4px;
        padding-top: 14px;
        border-top: 1px solid rgba(226, 232, 240, 0.95);
    }

    .header-mobile-nav__title {
        display: block;
        margin: 0 0 2px;
        color: #64748b;
        font-size: 12px;
        font-weight: 800;
        letter-spacing: .08em;
        text-transform: uppercase;
    }

    .header-mobile-nav a {
        display: flex;
        align-items: center;
        justify-content: space-between;
        width: 100%;
        min-height: 52px;
        padding: 0 16px;
        border-radius: 18px;
        background: rgba(248, 250, 252, 0.88);
        border: 1px solid rgba(226, 232, 240, 0.95);
        font-size: 16px;
        font-weight: 700;
        color: #334155;
        opacity: 1;
        text-decoration: none;
        box-shadow: 0 10px 24px rgba(148, 163, 184, 0.08);
        transition: transform .18s ease, border-color .18s ease, background .18s ease, color .18s ease;
    }

    .header-mobile-nav a::after {
        content: "›";
        font-size: 18px;
        color: #94a3b8;
    }

    .header-mobile-nav a.is-current {
        color: var(--color-primary-strong);
        background: linear-gradient(135deg, rgba(99, 102, 241, 0.14), rgba(79, 70, 229, 0.08));
        border-color: rgba(99, 102, 241, 0.24);
    }

    .header-mobile-nav a.is-current::after {
        color: var(--color-primary-strong);
    }

    .header-mobile-actions {
        display: flex;
        gap: 12px;
        flex-direction: column;
        align-items: stretch;
        margin-top: auto;
        padding-top: 18px;
        border-top: 1px solid rgba(226, 232, 240, 0.95);
    }

    .cart-icon--desktop {
        display: none;
    }

    .cart-icon--mobile {
        display: inline-flex;
    }

    .user-menu small {
        display: block;
        color: var(--color-text-muted);
        font-size: 12px;
    }

    .header-mobile-actions .btn-primary,
    .header-mobile-actions .header-link {
        min-height: 52px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 100%;
        padding: 0 18px;
        border-radius: 18px;
        font-size: 16px;
        text-decoration: none;
    }

    .header-mobile-actions .header-link {
        background: rgba(248, 250, 252, 0.92);
        border: 1px solid rgba(226, 232, 240, 0.95);
        color: #0f172a;
        box-shadow: 0 10px 24px rgba(148, 163, 184, 0.08);
    }

    .header-mobile-actions .btn-primary {
        box-shadow: 0 16px 30px rgba(79, 70, 229, 0.26);
    }

    .header-mobile-logout button {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 100%;
        min-height: 52px;
        padding: 0 18px;
        border-radius: 18px;
        background: linear-gradient(135deg, #0f172a, #1e293b);
        border: 1px solid rgba(15, 23, 42, 0.92);
        color: #fff;
        font-weight: 700;
        font-size: 16px;
        cursor: pointer;
        box-shadow: 0 16px 32px rgba(15, 23, 42, 0.22);
    }
}

@media (max-width: 768px) {
    .container,
    .page-shell,
    .panel-shell,
    .section,
    .auth-shell {
        padding: 0 18px;
    }

    .app-container {
        padding: 28px 0 44px;
    }

    .header-content {
        gap: 14px;
    }

    .logo {
        font-size: 1.2rem;
        max-width: calc(100% - 148px);
    }

    .header-tools {
        gap: 10px;
    }

    .section {
        margin: 48px auto;
    }

    .panel-card,
    .surface-card,
    .auth-card {
        padding: 22px;
    }

    .surface-item,
    .summary-card {
        align-items: stretch;
    }

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

    .detail-sidebar {
        position: static;
    }

    .surface-item,
    .surface-item-main,
    .catalog-lesson-list li {
        flex-direction: column;
        align-items: flex-start;
    }

    .surface-item-side {
        text-align: left;
        width: 100%;
    }

    .summary-card .form-actions,
    .surface-item-side form,
    .summary-card .btn-primary,
    .summary-card .btn-secondary,
    .summary-card form,
    .summary-card form button {
        width: 100%;
    }

    .form-actions,
    .auth-actions,
    .form-inline {
        align-items: stretch;
    }

    .btn-primary,
    .btn-secondary,
    .btn-danger,
    .btn-ghost {
        width: 100%;
    }

    .modal-card {
        padding: 22px;
    }

    .confirm-check {
        align-items: flex-start;
    }

    .pagination-shell,
    .pagination-nav,
    .pagination-pages {
        align-items: stretch;
    }

    .pagination-link,
    .pagination-page {
        min-height: 42px;
    }

    .search-section {
        padding: 52px 18px;
    }

    .search-box input {
        padding: 15px 16px;
    }

    .search-box {
        flex-direction: column;
        align-items: stretch;
        gap: 10px;
    }

    .search-box__button {
        width: 100%;
    }

    .toast-stack {
        top: 88px;
        left: 16px;
        right: 16px;
        width: auto;
    }
}