:root {
    color-scheme: light;
    --background: #f5f6f8;
    --surface: #ffffff;
    --border: #d9dee7;
    --text: #18202a;
    --muted: #5f6b7a;
    --accent: #c84e31;
    --accent-strong: #a83d25;
    --nav: #2f2f2f;
    --nav-text: #ffffff;
    --blue: #315f9f;
    --success: #2f7d5a;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--background);
    color: var(--text);
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.5;
}

a {
    color: var(--accent-strong);
}

.site-header {
    background: var(--surface);
}

.site-header__inner,
.main-nav__inner,
.page {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
}

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 64px;
    gap: 16px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    font-size: 1.1rem;
    font-weight: 700;
    text-decoration: none;
    color: var(--text);
}

.brand__logo {
    width: 44px;
    height: 44px;
    border-radius: 999px;
    object-fit: cover;
}

.top-actions {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 0.95rem;
}

.social-dot {
    display: inline-grid;
    width: 22px;
    height: 22px;
    place-items: center;
    border-radius: 999px;
    background: var(--blue);
    color: #ffffff;
    font-size: 0.75rem;
    font-weight: 700;
    text-decoration: none;
}

.social-icon {
    width: 13px;
    height: 13px;
    fill: currentColor;
}

.social-dot--red {
    background: #cf342b;
}

.language-menu {
    position: relative;
}

.language-menu__trigger {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    min-height: 36px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: #ffffff;
    color: var(--text);
    padding: 0 10px;
    font: inherit;
    cursor: pointer;
}

.language-menu__trigger::after {
    content: "";
    width: 0;
    height: 0;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 5px solid var(--muted);
}

.flag-image {
    display: block;
    width: 24px;
    height: 18px;
    flex: 0 0 auto;
    object-fit: cover;
    border: 1px solid rgba(24, 32, 42, 0.22);
    border-radius: 2px;
}

.language-menu__list {
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    z-index: 20;
    display: grid;
    min-width: 220px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: #ffffff;
    box-shadow: 0 12px 28px rgba(24, 32, 42, 0.16);
    padding: 6px;
}

.language-menu__list[hidden] {
    display: none;
}

.language-menu__option {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    border: 0;
    border-radius: 5px;
    background: transparent;
    color: var(--text);
    padding: 9px 10px;
    font: inherit;
    text-align: left;
    cursor: pointer;
}

.language-menu__option:hover,
.language-menu__option:focus {
    background: #f3f6fa;
    outline: none;
}

.language-menu__option[aria-current="true"] {
    background: #fff3ef;
    color: var(--accent-strong);
    font-weight: 700;
}

.institute-button,
.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 38px;
    border: 0;
    border-radius: 4px;
    background: var(--accent);
    color: #ffffff;
    padding: 0 14px;
    font-size: 0.9rem;
    font-weight: 700;
    text-decoration: none;
    cursor: pointer;
}

.button--secondary {
    border: 1px solid var(--border);
    background: #ffffff;
    color: var(--text);
}

.button--danger {
    background: var(--accent-strong);
}

.account-pill {
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 7px 12px;
    color: var(--muted);
    font-size: 0.9rem;
}

.main-nav {
    background: var(--nav);
}

.main-nav__inner {
    display: flex;
    align-items: center;
    min-height: 44px;
    gap: 22px;
}

.main-nav a,
.logout-form button {
    color: var(--nav-text);
    font-size: 0.8rem;
    font-weight: 700;
    text-decoration: none;
    text-transform: uppercase;
}

.logout-form {
    margin-left: auto;
}

.logout-form button {
    border: 0;
    background: transparent;
    cursor: pointer;
}

.page {
    padding: 40px 0;
}

.panel {
    max-width: 760px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 24px;
}

.app-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 340px;
    gap: 24px;
    align-items: start;
}

.app-grid--student-dashboard {
    grid-template-columns: 1fr;
}

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

.dashboard-header {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 24px;
    margin-bottom: 24px;
}

.dashboard-header h1 {
    margin-bottom: 8px;
    font-size: clamp(1.2rem, 2.4vw, 1.85rem);
}

.dashboard-panel,
.course-tile,
.auth-panel,
.admin-panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 20px;
}

.dashboard-panel--empty {
    min-height: 280px;
}

.course-hero {
    display: grid;
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 18px;
}

.course-watch {
    display: grid;
    gap: 16px;
}

.course-player {
    display: block;
    width: 100%;
    aspect-ratio: 16 / 9;
    border-radius: 6px;
    background: #111820;
}

.video-thumb,
.course-cover--placeholder {
    aspect-ratio: 16 / 10;
    border-radius: 6px;
    background:
        linear-gradient(135deg, rgba(49, 95, 159, 0.88), rgba(200, 78, 49, 0.82)),
        repeating-linear-gradient(45deg, rgba(255, 255, 255, 0.2) 0 8px, transparent 8px 16px);
}

.course-cover {
    display: block;
    width: 100%;
    aspect-ratio: 16 / 10;
    border-radius: 6px;
    object-fit: cover;
    background: var(--border);
}

.course-cover--preview {
    max-width: 320px;
    aspect-ratio: 16 / 9;
}

.lesson-list,
.simple-list {
    display: grid;
    gap: 10px;
    margin: 16px 0 0;
    padding: 0;
    list-style: none;
}

.lesson-list li,
.simple-list li {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    border-top: 1px solid var(--border);
    padding-top: 10px;
}

.lesson-list li > span:last-child {
    overflow-wrap: anywhere;
    text-align: right;
}

.status-chip {
    border-radius: 999px;
    background: #eef3fb;
    color: var(--blue);
    padding: 4px 9px;
    font-size: 0.78rem;
    font-weight: 700;
}

.status-chip--success {
    background: #ebf7f1;
    color: var(--success);
}

.course-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}

.course-tile {
    display: grid;
    align-content: start;
    gap: 10px;
}

.auth-panel {
    max-width: 460px;
    margin: 0 auto;
}

.form-grid {
    display: grid;
    gap: 14px;
}

.form-grid--two {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.search-toolbar {
    display: grid;
    grid-template-columns: minmax(220px, 1fr) auto auto;
    gap: 12px;
    align-items: end;
    margin-bottom: 12px;
}

.field {
    display: grid;
    gap: 6px;
}

.field label {
    font-weight: 700;
}

.field input,
.field select {
    width: 100%;
    min-height: 42px;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 8px 10px;
    font: inherit;
}

.alert {
    border: 1px solid #f0c4b8;
    border-radius: 6px;
    background: #fff4f1;
    color: #8a2f1f;
    padding: 10px 12px;
}

.alert--success {
    border-color: #b9dfca;
    background: #effaf4;
    color: #236447;
}

.admin-table {
    width: 100%;
    border-collapse: collapse;
}

.admin-table th,
.admin-table td {
    border-bottom: 1px solid var(--border);
    padding: 12px 10px;
    text-align: left;
}

.admin-table th {
    color: var(--muted);
    font-size: 0.82rem;
    text-transform: uppercase;
}

.table-summary {
    color: var(--muted);
    font-size: 0.92rem;
}

.pagination {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 18px;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
}

.eyebrow {
    margin: 0 0 8px;
    color: var(--accent);
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
}

h1 {
    margin: 0 0 16px;
    font-size: clamp(2rem, 4vw, 3.25rem);
    line-height: 1.1;
}

h2 {
    margin: 0 0 12px;
    font-size: 1.35rem;
}

p {
    margin: 0 0 16px;
}

.meta-list {
    display: grid;
    gap: 10px;
    margin: 16px 0 0;
    padding: 0;
    list-style: none;
}

.meta-list li {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    border-top: 1px solid var(--border);
    padding-top: 10px;
}

.meta-list strong {
    color: var(--muted);
}

.admin-detail {
    display: grid;
    gap: 18px;
}

.admin-detail h1 {
    margin-bottom: 0;
    font-size: clamp(1.2rem, 2.2vw, 1.6rem);
}

.user-panel-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 18px;
}

.tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    border-bottom: 1px solid var(--border);
}

.tab-link {
    border: 1px solid transparent;
    border-bottom: 0;
    border-radius: 6px 6px 0 0;
    color: var(--muted);
    padding: 9px 12px;
    font-size: 0.9rem;
    font-weight: 700;
    text-decoration: none;
}

.tab-link--active {
    border-color: var(--border);
    background: #ffffff;
    color: var(--accent-strong);
}

.summary-grid {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 12px;
}

.summary-tile {
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 14px;
}

.summary-tile span {
    display: block;
    color: var(--muted);
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
}

.summary-tile strong {
    display: block;
    margin-top: 6px;
    font-size: 1.2rem;
}

.table-wrap {
    overflow-x: auto;
}

.empty-state {
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 18px;
}

.empty-state p {
    margin-bottom: 0;
}

.coming-soon {
    margin: 32px 0;
    color: var(--muted);
    font-size: 1.15rem;
    font-weight: 700;
    text-align: center;
}

.generated-password {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 8px;
    border: 1px solid #b9dfca;
    border-radius: 6px;
    background: #effaf4;
    padding: 12px 14px;
}

.generated-password--inline {
    border: 0;
    background: transparent;
    padding: 0;
}

.generated-password span {
    color: #236447;
    font-weight: 700;
}

.generated-password strong {
    color: #13251c;
    font-family: Consolas, "Courier New", monospace;
    font-size: 1.1rem;
    letter-spacing: 0;
}

.password-reset-inline {
    display: inline-flex;
    align-items: center;
    justify-content: flex-end;
    gap: 12px;
    flex-wrap: wrap;
}

.meta-list--detail {
    margin: 0;
    border-top: 1px solid var(--border);
}

.meta-list--detail li {
    min-height: 50px;
    align-items: center;
}

.meta-list--detail span,
.meta-list--detail select {
    text-align: right;
}

.meta-list--detail label {
    color: var(--muted);
    font-weight: 700;
}

.meta-list--detail select {
    width: min(260px, 100%);
    min-height: 38px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: #ffffff;
    padding: 7px 9px;
    font: inherit;
}

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

.detail-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 12px;
    border-top: 1px solid var(--border);
    padding-top: 18px;
}

.admin-table--clickable tbody tr {
    cursor: pointer;
    transition: background 0.12s ease;
}

.admin-table--clickable tbody tr:hover {
    background: #f3f6fa;
}

.admin-table--clickable tbody tr:active {
    background: #e9eef6;
}

.upload-progress-wrap {
    display: grid;
    gap: 8px;
}

.upload-progress-track {
    height: 10px;
    border-radius: 999px;
    background: var(--border);
    overflow: hidden;
}

.upload-progress-fill {
    height: 100%;
    border-radius: 999px;
    background: var(--success);
    transition: width 0.25s ease;
}

.upload-progress-fill--error {
    background: var(--accent);
}

.upload-progress-label {
    margin: 0;
    color: var(--muted);
    font-size: 0.875rem;
}

@media (max-width: 640px) {
    .site-header__inner {
        align-items: flex-start;
        flex-direction: column;
        padding: 16px 0;
    }

    .nav {
        flex-wrap: wrap;
    }

    .top-actions,
    .main-nav__inner {
        flex-wrap: wrap;
    }

    .app-grid,
    .course-hero,
    .course-grid,
    .search-toolbar,
    .form-grid--two {
        grid-template-columns: 1fr;
    }

    .pagination {
        align-items: stretch;
        flex-direction: column;
    }

    .user-panel-header {
        flex-direction: column;
    }

    .summary-grid {
        grid-template-columns: 1fr;
    }

    .detail-actions {
        align-items: stretch;
        flex-direction: column-reverse;
    }

    .meta-list--detail li {
        align-items: stretch;
        flex-direction: column;
    }

    .meta-list--detail span,
    .meta-list--detail select {
        text-align: left;
        width: 100%;
    }

    .page {
        padding: 24px 0;
    }
}