/*
 * Courseboard's interface is deliberately small and readable. Bootstrap supplies
 * sensible structural utilities when available; these styles keep the application
 * usable and recognisable even before the local Bootstrap assets are installed.
 */

:root {
    --paper: #f6f5f0;
    --paper-deep: #eceae2;
    --surface: #ffffff;
    --ink: #182033;
    --ink-soft: #394154;
    --muted: #667085;
    --line: #d9dee7;
    --line-strong: #7e8795;
    --brand: #1f6657;
    --brand-dark: #154b40;
    --brand-soft: #e2f0eb;
    --accent: #c9792f;
    --accent-soft: #f8ead9;
    --danger: #a23b3b;
    --danger-dark: #7f2929;
    --danger-soft: #f9e8e7;
    --warning: #875d17;
    --warning-soft: #fff3d7;
    --info: #315f8f;
    --info-soft: #e8f1fa;
    --success: #276749;
    --success-soft: #e3f2e9;
    --focus: #9b6400;
    --radius-sm: 6px;
    --radius: 10px;
    --radius-lg: 14px;
    --shadow-sm: 0 1px 2px rgba(24, 32, 51, 0.06);
    --shadow: 0 12px 32px rgba(24, 32, 51, 0.08);
    --content-width: 1160px;
    --reading-width: 720px;
    --transition: 150ms ease;

    --bs-body-font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --bs-body-color: var(--ink);
    --bs-body-bg: var(--paper);
    --bs-primary: var(--brand);
    --bs-primary-rgb: 31, 102, 87;
    --bs-border-color: var(--line);
    --bs-link-color: var(--brand-dark);
    --bs-link-hover-color: var(--brand);
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    min-width: 320px;
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;
    margin: 0;
    display: flex;
    flex-direction: column;
    color: var(--ink);
    background: var(--paper);
    font-family: var(--bs-body-font-family);
    font-size: 1rem;
    line-height: 1.6;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
}

img,
svg {
    max-width: 100%;
    height: auto;
}

a {
    color: var(--brand-dark);
    text-decoration-thickness: 1px;
    text-underline-offset: 0.18em;
}

a:hover {
    color: var(--brand);
}

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

button,
[type="button"],
[type="submit"],
[role="button"],
summary {
    touch-action: manipulation;
}

:focus-visible {
    outline: 3px solid var(--focus) !important;
    outline-offset: 3px !important;
    box-shadow: none !important;
}

::selection {
    color: var(--ink);
    background: #f2cf91;
}

h1,
h2,
h3,
h4,
p,
dl,
ol,
ul {
    margin-top: 0;
}

h1,
h2,
h3,
h4 {
    color: var(--ink);
    line-height: 1.18;
}

h1,
.display-title {
    margin-bottom: 0.75rem;
    font-family: ui-serif, Georgia, Cambria, "Times New Roman", serif;
    font-size: clamp(2rem, 4.5vw, 3rem);
    font-weight: 600;
    letter-spacing: -0.025em;
}

h2 {
    margin-bottom: 0.75rem;
    font-size: clamp(1.5rem, 3vw, 2rem);
    letter-spacing: -0.018em;
}

h3 {
    margin-bottom: 0.5rem;
    font-size: 1.125rem;
}

code {
    color: var(--ink);
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
    font-size: 0.86em;
}

.app-container,
.container {
    width: min(calc(100% - 3rem), var(--content-width));
    margin-inline: auto;
}

.site-main {
    flex: 1 0 auto;
    width: 100%;
}

.skip-link {
    position: fixed;
    z-index: 1100;
    top: 0.75rem;
    left: 0.75rem;
    padding: 0.7rem 1rem;
    color: #fff;
    background: var(--ink);
    border-radius: var(--radius-sm);
    transform: translateY(-160%);
    transition: transform var(--transition);
}

.skip-link:focus {
    color: #fff;
    transform: translateY(0);
}

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

/* Header */

.site-header {
    position: relative;
    z-index: 100;
    min-height: 68px;
    background: rgba(255, 255, 255, 0.96);
    border-bottom: 1px solid var(--line);
}

.site-header__inner {
    min-height: 68px;
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.brand {
    flex: 0 0 auto;
    display: inline-flex;
    align-items: center;
    gap: 0.7rem;
    color: var(--ink);
    text-decoration: none;
}

.brand:hover {
    color: var(--ink);
}

.brand__mark {
    position: relative;
    width: 31px;
    height: 35px;
    display: inline-block;
    background: var(--brand);
    border-radius: 4px 7px 7px 4px;
    box-shadow: inset 5px 0 0 rgba(255, 255, 255, 0.2);
    transform: rotate(-1deg);
}

.brand__mark::before {
    content: "";
    position: absolute;
    top: 7px;
    right: 6px;
    width: 13px;
    height: 2px;
    background: rgba(255, 255, 255, 0.88);
    box-shadow: 0 6px 0 rgba(255, 255, 255, 0.62);
}

.brand__mark::after {
    content: "";
    position: absolute;
    top: 4px;
    right: -3px;
    width: 3px;
    height: 25px;
    background: var(--accent);
    border-radius: 0 3px 3px 0;
}

.brand__words {
    display: grid;
    line-height: 1.05;
}

.brand__name {
    font-family: ui-serif, Georgia, Cambria, serif;
    font-size: 1.17rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.brand__strapline {
    margin-top: 0.25rem;
    color: var(--muted);
    font-size: 0.68rem;
    font-weight: 650;
    letter-spacing: 0.075em;
    text-transform: uppercase;
}

.primary-navigation,
.guest-navigation,
.header-account {
    display: flex;
    align-items: center;
}

.primary-navigation {
    align-self: stretch;
    min-width: 0;
    gap: 0.2rem;
}

.nav-link,
.notification-link {
    position: relative;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    padding: 0.55rem 0.65rem;
    color: var(--ink-soft);
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    white-space: nowrap;
}

.nav-link::after,
.notification-link::after {
    content: "";
    position: absolute;
    right: 0.65rem;
    bottom: -12px;
    left: 0.65rem;
    height: 3px;
    background: var(--brand);
    border-radius: 3px 3px 0 0;
    opacity: 0;
    transform: scaleX(0.6);
    transition: opacity var(--transition), transform var(--transition);
}

.nav-link:hover,
.nav-link.is-active,
.notification-link:hover,
.notification-link.is-active {
    color: var(--brand-dark);
}

.nav-link.is-active::after,
.notification-link.is-active::after {
    opacity: 1;
    transform: scaleX(1);
}

.guest-navigation {
    margin-left: auto;
    gap: 0.75rem;
}

.header-account {
    margin-left: auto;
    gap: 0.65rem;
}

.notification-link {
    gap: 0.42rem;
}

.notification-count {
    min-width: 1.42rem;
    height: 1.42rem;
    display: inline-grid;
    place-items: center;
    padding-inline: 0.32rem;
    color: #fff;
    background: var(--danger);
    border: 2px solid #fff;
    border-radius: 999px;
    font-size: 0.69rem;
    font-weight: 750;
    line-height: 1;
}

.profile-link {
    max-width: 12rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.25rem;
    color: var(--ink);
    text-decoration: none;
    border-radius: var(--radius-sm);
}

.profile-link:hover {
    color: var(--ink);
    background: var(--paper);
}

.profile-link__text {
    min-width: 0;
    display: grid;
    line-height: 1.25;
}

.profile-link__text strong,
.profile-link__text small {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.profile-link__text strong {
    font-size: 0.82rem;
}

.profile-link__text small {
    color: var(--muted);
    font-size: 0.72rem;
}

.avatar {
    width: 2.35rem;
    height: 2.35rem;
    flex: 0 0 auto;
    display: inline-grid;
    place-items: center;
    overflow: hidden;
    color: var(--brand-dark);
    background: var(--brand-soft);
    border: 1px solid #c2ddd3;
    border-radius: 50%;
    font-size: 0.92rem;
    font-weight: 750;
    text-transform: uppercase;
}

.avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.avatar--small {
    width: 2rem;
    height: 2rem;
    font-size: 0.78rem;
}

.avatar--profile {
    width: 5rem;
    height: 5rem;
    font-size: 1.65rem;
}

.logout-form {
    margin: 0;
}

.text-button {
    min-height: 40px;
    padding: 0.45rem 0.3rem;
    color: var(--muted);
    background: transparent;
    border: 0;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.82rem;
    font-weight: 650;
}

.text-button:hover {
    color: var(--danger-dark);
    text-decoration: underline;
    text-underline-offset: 0.2em;
}

.mobile-navigation {
    position: relative;
    display: none;
    margin-left: auto;
}

.menu-toggle {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.5rem 0.7rem;
    color: var(--ink);
    background: var(--surface);
    border: 1px solid var(--line-strong);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: 700;
    list-style: none;
}

.menu-toggle::-webkit-details-marker {
    display: none;
}

.menu-icon,
.menu-icon::before,
.menu-icon::after {
    width: 18px;
    height: 2px;
    display: block;
    background: currentColor;
    border-radius: 2px;
}

.menu-icon {
    position: relative;
}

.menu-icon::before,
.menu-icon::after {
    content: "";
    position: absolute;
    left: 0;
}

.menu-icon::before {
    top: -6px;
}

.menu-icon::after {
    top: 6px;
}

.mobile-menu {
    position: absolute;
    top: calc(100% + 0.55rem);
    right: 0;
    width: min(19rem, calc(100vw - 2rem));
    padding: 0.6rem;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.mobile-menu nav,
nav.mobile-menu {
    display: grid;
}

.mobile-menu nav a,
nav.mobile-menu a,
.mobile-menu__logout {
    width: 100%;
    min-height: 44px;
    display: flex;
    align-items: center;
    padding: 0.6rem 0.7rem;
    color: var(--ink);
    background: transparent;
    border: 0;
    border-radius: var(--radius-sm);
    text-align: left;
    text-decoration: none;
    cursor: pointer;
    font-weight: 600;
}

.mobile-menu nav a:hover,
nav.mobile-menu a:hover,
.mobile-menu__logout:hover {
    color: var(--brand-dark);
    background: var(--paper);
}

.mobile-menu nav a[aria-current="page"],
nav.mobile-menu a[aria-current="page"] {
    color: var(--brand-dark);
    background: var(--brand-soft);
    box-shadow: inset 3px 0 0 var(--brand);
}

.mobile-menu__identity {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    margin: -0.05rem 0 0.5rem;
    padding: 0.65rem 0.65rem 0.8rem;
    border-bottom: 1px solid var(--line);
}

.mobile-menu__identity > span:last-child {
    min-width: 0;
    display: grid;
}

.mobile-menu__identity strong {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.mobile-menu__identity small {
    color: var(--muted);
}

.mobile-menu form {
    margin: 0.35rem 0 0;
    padding-top: 0.35rem;
    border-top: 1px solid var(--line);
}

.mobile-menu__logout {
    color: var(--danger-dark);
}

/* Buttons and common application pieces */

.button,
.btn {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.45rem;
    padding: 0.67rem 1rem;
    color: #fff;
    background: var(--brand);
    border: 1px solid var(--brand);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    font-weight: 700;
    line-height: 1.2;
    text-align: center;
    text-decoration: none;
    transition: background-color var(--transition), border-color var(--transition), color var(--transition), transform var(--transition);
}

.button:hover,
.btn:hover,
.btn-primary:hover {
    color: #fff;
    background: var(--brand-dark);
    border-color: var(--brand-dark);
    transform: translateY(-1px);
}

.button--secondary,
.btn-secondary,
.btn-outline-primary {
    color: var(--brand-dark);
    background: var(--surface);
    border-color: #8dafaa;
}

.button--secondary:hover,
.btn-secondary:hover,
.btn-outline-primary:hover {
    color: var(--brand-dark);
    background: var(--brand-soft);
    border-color: var(--brand);
}

.button--quiet {
    color: var(--brand-dark);
    background: transparent;
    border-color: var(--line-strong);
    box-shadow: none;
}

.button--quiet:hover {
    color: var(--brand-dark);
    background: var(--brand-soft);
    border-color: #8dafaa;
}

.button--danger,
.btn-danger {
    color: #fff;
    background: var(--danger);
    border-color: var(--danger);
}

.button--danger:hover,
.btn-danger:hover {
    color: #fff;
    background: var(--danger-dark);
    border-color: var(--danger-dark);
}

.button--small,
.btn-sm {
    min-height: 38px;
    padding: 0.5rem 0.78rem;
    font-size: 0.88rem;
}

.button:disabled,
.btn:disabled,
button:disabled {
    cursor: not-allowed;
    opacity: 0.58;
    transform: none;
}

.button-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
    gap: 0.85rem;
}

.person-summary,
.profile-identity {
    display: inline-flex;
    align-items: center;
}

.person-summary {
    gap: 0.65rem;
}

.profile-identity {
    gap: 1rem;
}

.profile-identity > div,
.feedback-list__header > div {
    min-width: 0;
}

.profile-identity h1,
.profile-identity p,
.feedback-list__header .quiet-note {
    overflow-wrap: anywhere;
}

.flush-bottom {
    margin-bottom: 0;
}

.eyebrow {
    margin-bottom: 0.55rem;
    color: var(--brand-dark);
    font-size: 0.74rem;
    font-weight: 800;
    letter-spacing: 0.105em;
    text-transform: uppercase;
}

.quiet-note,
.text-muted {
    color: var(--muted) !important;
}

.meta {
    color: var(--muted);
    font-size: 0.8rem;
}

.deadline-warning {
    margin: 0.75rem 0 0;
    padding: 0.55rem 0.7rem;
    color: #68400f;
    background: #fff5df;
    border-left: 3px solid var(--accent);
    font-size: 0.86rem;
}

.badge,
.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.28rem 0.55rem;
    color: var(--ink-soft);
    background: var(--paper-deep);
    border: 1px solid var(--line);
    border-radius: 999px;
    font-size: 0.74rem;
    font-weight: 750;
    letter-spacing: 0.015em;
}

.badge.bg-success,
.status-badge--active {
    color: var(--success);
    background: var(--success-soft) !important;
    border-color: #b9dbc6;
}

.badge.bg-danger,
.status-badge--blocked {
    color: var(--danger-dark);
    background: var(--danger-soft) !important;
    border-color: #ecc4c1;
}

.badge.bg-warning,
.status-badge--removed {
    color: var(--warning);
    background: var(--warning-soft) !important;
    border-color: #ead39f;
}

.card,
.panel {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}

.card-body,
.panel__body {
    padding: 1.25rem;
}

.page-shell {
    padding-block: clamp(2rem, 5vw, 4rem);
}

.page-header {
    display: flex;
    flex-wrap: wrap;
    align-items: end;
    justify-content: space-between;
    gap: 1.5rem;
    margin-bottom: 1.75rem;
}

.page-header > div:first-child {
    max-width: 48rem;
}

.page-header > .eyebrow,
.page-header > h1,
.page-header > h1 + p {
    flex-basis: 100%;
}

.page-header:has(> h1) {
    display: block;
}

.page-header h1 {
    margin-bottom: 0.45rem;
}

.page-header p:last-child {
    margin-bottom: 0;
    color: var(--muted);
}

.account-page .page-header,
.account-page .panel {
    margin-inline: auto;
}

.account-page .page-header {
    max-width: 44rem;
}

.page-heading,
.breadcrumbs,
.chat-panel,
.notification-list,
.pagination-region,
.site-main > .empty-state,
.site-main > [data-notification-status] {
    width: min(calc(100% - 3rem), var(--content-width));
    margin-inline: auto;
}

.page-heading {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 1.5rem;
    padding-top: clamp(2rem, 5vw, 4rem);
    margin-bottom: 1.75rem;
}

.page-heading > div:first-child {
    max-width: 48rem;
}

.page-heading h1 {
    margin-bottom: 0.45rem;
}

.page-heading p:last-child {
    margin-bottom: 0;
    color: var(--muted);
}

.page-heading--compact {
    padding-top: 0;
}

.breadcrumbs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    padding-top: 1.4rem;
    color: var(--muted);
    font-size: 0.86rem;
}

.breadcrumbs a {
    color: var(--ink-soft);
}

.breadcrumb {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    margin: 0 0 1rem;
    padding: 0;
    color: var(--muted);
    background: transparent;
    list-style: none;
    font-size: 0.86rem;
}

.breadcrumb-item + .breadcrumb-item::before {
    content: "/";
    margin-right: 0.35rem;
    color: var(--line-strong);
}

.empty-state {
    padding: clamp(2rem, 6vw, 4rem) 1.5rem;
    color: var(--muted);
    background: rgba(255, 255, 255, 0.55);
    border: 1px dashed var(--line-strong);
    border-radius: var(--radius);
    text-align: center;
}

.empty-state h2,
.empty-state h3 {
    color: var(--ink);
}

.empty-state p {
    max-width: 34rem;
    margin-inline: auto;
}

.empty-state--compact {
    padding-block: clamp(1.35rem, 4vw, 2rem);
}

.section-spaced {
    margin-bottom: 2rem;
}

.section-spaced--compact {
    margin-bottom: 1.5rem;
}

.site-main > .empty-state {
    margin-bottom: 3rem;
}

/* Flash messages */

.flash-region {
    position: relative;
    z-index: 10;
    display: grid;
    gap: 0.65rem;
    padding-top: 1rem;
}

.app-alert {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.85rem 1rem;
    color: var(--ink-soft);
    background: var(--info-soft);
    border: 1px solid #bfd5e9;
    border-radius: var(--radius-sm);
}

.app-alert__indicator {
    width: 0.62rem;
    height: 0.62rem;
    flex: 0 0 auto;
    margin-top: 0.42rem;
    background: var(--info);
    border-radius: 50%;
}

.app-alert strong {
    display: block;
    color: var(--ink);
    font-size: 0.86rem;
}

.app-alert p {
    margin: 0.05rem 0 0;
}

.app-alert--success {
    background: var(--success-soft);
    border-color: #b9dbc6;
}

.app-alert--success .app-alert__indicator {
    background: var(--success);
}

.app-alert--warning {
    background: var(--warning-soft);
    border-color: #ead39f;
}

.app-alert--warning .app-alert__indicator {
    background: var(--warning);
}

.app-alert--error,
.app-alert--danger {
    background: var(--danger-soft);
    border-color: #ecc4c1;
}

.app-alert--error .app-alert__indicator,
.app-alert--danger .app-alert__indicator {
    background: var(--danger);
}

/* Forms */

.form-panel {
    max-width: 44rem;
}

.form-panel--narrow {
    max-width: 38rem;
}

.form-panel--medium {
    max-width: 42rem;
}

.form-panel--wide {
    max-width: 47.5rem;
}

.search-form-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 0.75rem;
}

form p {
    margin-bottom: 1rem;
}

label,
.form-label {
    display: inline-block;
    margin-bottom: 0.36rem;
    color: var(--ink);
    font-size: 0.9rem;
    font-weight: 700;
}

input:not([type="checkbox"]):not([type="radio"]):not([type="submit"]),
select,
textarea,
.form-control,
.form-select {
    width: 100%;
    min-height: 44px;
    padding: 0.67rem 0.78rem;
    color: var(--ink);
    background: var(--surface);
    border: 1px solid var(--line-strong);
    border-radius: var(--radius-sm);
    box-shadow: inset 0 1px 1px rgba(24, 32, 51, 0.025);
    transition: border-color var(--transition), box-shadow var(--transition);
}

textarea,
textarea.form-control {
    min-height: 8rem;
    resize: vertical;
}

input:hover,
select:hover,
textarea:hover,
.form-control:hover,
.form-select:hover {
    border-color: #8e99aa;
}

input:focus,
select:focus,
textarea:focus,
.form-control:focus,
.form-select:focus {
    border-color: var(--brand);
}

input[type="checkbox"],
input[type="radio"] {
    width: 1.5rem;
    height: 1.5rem;
    margin-right: 0.35rem;
    accent-color: var(--brand);
}

.helptext,
.form-text {
    display: block;
    margin-top: 0.35rem;
    color: var(--muted);
    font-size: 0.82rem;
}

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

.form-error-summary {
    margin-bottom: 1.25rem;
    padding: 0.9rem 1rem;
    color: var(--danger-dark);
    background: var(--danger-soft);
    border: 1px solid #ecc4c1;
    border-left: 4px solid var(--danger);
    border-radius: var(--radius-sm);
}

.form-error-summary h3,
.form-error-summary p {
    margin-bottom: 0.3rem;
}

.status-list {
    display: grid;
    gap: 0.8rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

[aria-invalid="true"] {
    border-color: var(--danger) !important;
}

.errorlist,
.invalid-feedback {
    display: block;
    margin: 0.4rem 0 0;
    padding: 0;
    color: var(--danger-dark);
    list-style: none;
    font-size: 0.86rem;
    font-weight: 650;
}

.errorlist.nonfield {
    margin-bottom: 1rem;
    padding: 0.8rem 0.9rem;
    background: var(--danger-soft);
    border: 1px solid #ecc4c1;
    border-radius: var(--radius-sm);
}

/* Feedback */

.feedback-summary {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.8rem;
    margin: 1rem 0 1.5rem;
}

.feedback-summary > div {
    padding: 0.85rem 1rem;
    background: var(--paper);
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
}

.feedback-summary dt {
    color: var(--muted);
    font-size: 0.76rem;
    font-weight: 750;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.feedback-summary dd {
    margin: 0.15rem 0 0;
    color: var(--ink);
    font-family: ui-serif, Georgia, Cambria, serif;
    font-size: 1.55rem;
    font-weight: 700;
}

.feedback-list {
    margin: 0;
    padding: 0;
    border-top: 1px solid var(--line);
    list-style: none;
}

.feedback-list > li {
    padding: 1rem 0;
    border-bottom: 1px solid var(--line);
}

.feedback-list > li:last-child {
    padding-bottom: 0;
    border-bottom: 0;
}

.feedback-list__header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 0.55rem;
}

.feedback-list__header > div {
    display: grid;
}

.feedback-score {
    flex: 0 0 auto;
    padding: 0.25rem 0.55rem;
    color: var(--brand-dark);
    background: var(--brand-soft);
    border: 1px solid #bed9cf;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 750;
}

/* Tables and pagination */

.table-responsive {
    max-width: 100%;
    overflow-x: auto;
    contain: layout inline-size;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    -webkit-overflow-scrolling: touch;
}

table,
.table {
    width: 100%;
    margin: 0;
    color: var(--ink);
    background: var(--surface);
    border-collapse: collapse;
}

caption {
    padding: 0.75rem 1rem;
    color: var(--muted);
    text-align: left;
}

th,
td,
.table > :not(caption) > * > * {
    padding: 0.82rem 1rem;
    border-bottom: 1px solid var(--line);
    text-align: left;
    vertical-align: middle;
}

th,
.table th {
    color: var(--ink-soft);
    background: #fafaf8;
    font-size: 0.75rem;
    font-weight: 800;
    letter-spacing: 0.055em;
    text-transform: uppercase;
}

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

tbody tr:hover td {
    background: #fbfcfa;
}

.pagination {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.35rem;
    margin: 1.5rem 0 0;
    padding: 0;
    list-style: none;
}

.page-link {
    min-width: 42px;
    min-height: 42px;
    display: inline-grid;
    place-items: center;
    padding: 0.45rem 0.7rem;
    color: var(--ink-soft);
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius-sm) !important;
    text-decoration: none;
}

.page-item.active .page-link,
.page-link:hover {
    color: #fff;
    background: var(--brand);
    border-color: var(--brand);
}

.page-item.disabled .page-link {
    color: #8b93a1;
    background: #f3f3f0;
    border-color: var(--line);
    pointer-events: none;
}

.pagination-region {
    margin-bottom: 3rem;
}

/* Notifications */

.notification-list {
    max-width: 58rem;
    margin-bottom: 1.5rem;
    padding: 0;
    overflow: hidden;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    list-style: none;
}

.notification-row {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.25rem;
    min-height: 6.2rem;
    padding: 1rem 1.15rem;
    border-bottom: 1px solid var(--line);
    transition: background-color var(--transition);
}

.notification-row:last-child {
    border-bottom: 0;
}

.notification-row::before {
    content: "";
    position: absolute;
    inset: 0 auto 0 0;
    width: 4px;
    background: transparent;
}

.notification--unread {
    background: #f2f8f5;
}

.notification--unread::before {
    background: var(--brand);
}

.notification-row__body {
    min-width: 0;
}

.notification-row__heading {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.24rem;
}

.notification-row__body > p {
    margin-bottom: 0.22rem;
    overflow-wrap: anywhere;
}

.notification-row__body > p:last-child {
    margin-bottom: 0;
}

.unread-dot {
    width: 0.54rem;
    height: 0.54rem;
    flex: 0 0 auto;
    display: inline-block;
    background: var(--brand);
    border-radius: 50%;
}

/* Course chat */

.chat-panel {
    max-width: 52rem;
    margin-bottom: clamp(2.5rem, 6vw, 5rem);
    overflow: hidden;
    background: var(--surface);
    border: 1px solid var(--line-strong);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.chat-panel__status {
    padding: 0.6rem 1rem;
    color: var(--muted);
    background: #fafaf8;
    border-bottom: 1px solid var(--line);
    font-size: 0.78rem;
    text-align: right;
}

.chat-panel__status strong {
    color: var(--brand-dark);
}

.chat-log {
    height: clamp(22rem, 56vh, 36rem);
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    margin: 0;
    padding: 1.25rem;
    overflow-y: auto;
    overscroll-behavior: contain;
    background: #fbfbf8;
    list-style: none;
    scrollbar-color: var(--line-strong) transparent;
}

.chat-message {
    width: fit-content;
    max-width: min(76%, 36rem);
    padding: 0.72rem 0.85rem;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 4px var(--radius) var(--radius) var(--radius);
    box-shadow: var(--shadow-sm);
}

.chat-message--own {
    align-self: flex-end;
    background: var(--brand-soft);
    border-color: #bed9cf;
    border-radius: var(--radius) 4px var(--radius) var(--radius);
}

.chat-message__meta {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 0.25rem;
    color: var(--muted);
    font-size: 0.72rem;
}

.chat-message__meta strong {
    color: var(--ink-soft);
}

.chat-message p {
    margin: 0;
    overflow-wrap: anywhere;
    white-space: pre-wrap;
}

.chat-empty {
    max-width: 28rem;
    margin: auto;
    padding: 1rem;
    color: var(--muted);
    text-align: center;
}

.chat-composer {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 0.55rem 0.8rem;
    margin: 0;
    padding: 1rem;
    background: var(--surface);
    border-top: 1px solid var(--line);
}

.chat-composer label {
    grid-column: 1 / -1;
    margin-bottom: 0;
}

.chat-composer textarea {
    min-height: 4.4rem;
    margin: 0;
}

.chat-composer__actions {
    min-width: 8.5rem;
    display: grid;
    justify-items: end;
    gap: 0.35rem;
}

/* Landing page */

.landing-hero {
    position: relative;
    overflow: hidden;
    padding-block: clamp(3.25rem, 8vw, 6.75rem);
    border-bottom: 1px solid var(--line);
}

.landing-hero::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: -1;
    background:
        linear-gradient(90deg, rgba(31, 102, 87, 0.045) 1px, transparent 1px) 0 0 / 56px 56px,
        linear-gradient(rgba(31, 102, 87, 0.045) 1px, transparent 1px) 0 0 / 56px 56px;
    mask-image: linear-gradient(to bottom, black, transparent 84%);
}

.landing-hero__grid {
    display: grid;
    grid-template-columns: minmax(0, 1.12fr) minmax(25rem, 0.88fr);
    align-items: center;
    gap: clamp(2.5rem, 7vw, 6.5rem);
}

.landing-introduction {
    max-width: 39rem;
}

.landing-introduction h1 {
    max-width: 10ch;
    margin-bottom: 1rem;
    font-size: clamp(3rem, 7vw, 5.7rem);
    line-height: 0.98;
}

.landing-introduction__lead {
    max-width: 35rem;
    margin-bottom: 1.65rem;
    color: var(--ink-soft);
    font-size: clamp(1.08rem, 2vw, 1.27rem);
}

.landing-notes {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.2rem;
    margin: 2.4rem 0 0;
    padding-top: 1.15rem;
    border-top: 1px solid var(--line-strong);
}

.landing-notes div {
    padding-left: 0.8rem;
    border-left: 3px solid var(--accent);
}

.landing-notes dt {
    margin-bottom: 0.2rem;
    font-weight: 750;
}

.landing-notes dd {
    margin: 0;
    color: var(--muted);
    font-size: 0.88rem;
}

.demo-panel {
    position: relative;
    padding: clamp(1.2rem, 3vw, 1.65rem);
    background: var(--surface);
    border: 1px solid var(--line-strong);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

.demo-panel::before {
    content: "";
    position: absolute;
    top: 1rem;
    bottom: 1rem;
    left: -5px;
    width: 5px;
    background: var(--brand);
    border-radius: 5px 0 0 5px;
}

.demo-panel__header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1rem;
}

.demo-panel__header h2 {
    margin-bottom: 0;
    font-size: 1.35rem;
}

.demo-panel__status {
    flex: 0 0 auto;
    display: inline-flex;
    align-items: center;
    gap: 0.38rem;
    padding: 0.28rem 0.48rem;
    color: var(--success);
    background: var(--success-soft);
    border-radius: 999px;
    font-size: 0.7rem;
    font-weight: 750;
}

.demo-panel__status::before {
    content: "";
    width: 0.43rem;
    height: 0.43rem;
    background: var(--success);
    border-radius: 50%;
}

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

.runtime-list div {
    display: grid;
    grid-template-columns: minmax(8rem, 0.8fr) minmax(0, 1.2fr);
    gap: 1rem;
    padding: 0.52rem 0;
    border-bottom: 1px solid var(--line);
}

.runtime-list dt {
    color: var(--muted);
    font-size: 0.78rem;
    font-weight: 650;
}

.runtime-list dd {
    min-width: 0;
    margin: 0;
    overflow-wrap: anywhere;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.76rem;
    text-align: right;
}

.demo-accounts {
    margin-top: 1.2rem;
}

.demo-accounts h3 {
    margin-bottom: 0.1rem;
    font-size: 0.98rem;
}

.demo-accounts > p {
    margin-bottom: 0.7rem;
    color: var(--muted);
    font-size: 0.8rem;
}

.demo-account-list {
    display: grid;
    gap: 0.4rem;
}

.demo-account {
    display: grid;
    grid-template-columns: minmax(5.9rem, 0.72fr) minmax(5.7rem, 0.85fr) minmax(9.4rem, 1.35fr);
    align-items: center;
    gap: 0.55rem;
    padding: 0.47rem 0.55rem;
    background: var(--paper);
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    font-size: 0.77rem;
}

.demo-account strong {
    color: var(--ink-soft);
}

.demo-account code {
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 0.76rem;
}

.demo-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem 1rem;
    margin-top: 1rem;
    padding-top: 0.9rem;
    border-top: 1px solid var(--line);
}

.demo-links a {
    font-size: 0.8rem;
    font-weight: 700;
}

.landing-section {
    padding-block: clamp(3.5rem, 8vw, 6rem);
    background: var(--surface);
    border-bottom: 1px solid var(--line);
}

.section-heading {
    margin-bottom: 1.6rem;
}

.section-heading--split {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    align-items: end;
    gap: 2rem;
}

.section-heading h2 {
    margin-bottom: 0;
}

.section-heading--split > p {
    max-width: 38rem;
    margin: 0;
    color: var(--muted);
}

.feature-ledger {
    margin: 0;
    padding: 0;
    border-top: 1px solid var(--line-strong);
    list-style: none;
}

.feature-ledger li {
    display: grid;
    grid-template-columns: 3.5rem minmax(0, 1fr) auto;
    align-items: center;
    gap: 1.25rem;
    padding: 1.35rem 0;
    border-bottom: 1px solid var(--line);
}

.feature-ledger__number {
    color: var(--accent);
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.78rem;
    font-weight: 750;
}

.feature-ledger h3 {
    margin-bottom: 0.2rem;
}

.feature-ledger p {
    max-width: 48rem;
    margin-bottom: 0;
    color: var(--muted);
}

.feature-ledger__label {
    padding: 0.25rem 0.55rem;
    color: var(--ink-soft);
    background: var(--paper);
    border-radius: 999px;
    font-size: 0.73rem;
    font-weight: 700;
}

.project-note {
    padding-block: clamp(3rem, 6vw, 4.5rem);
    background: var(--paper);
}

.project-note__inner {
    display: grid;
    grid-template-columns: 4px minmax(16rem, 0.82fr) minmax(0, 1.18fr);
    align-items: center;
    gap: clamp(1.3rem, 4vw, 3.5rem);
}

.project-note__rule {
    align-self: stretch;
    background: var(--accent);
    border-radius: 4px;
}

.project-note h2,
.project-note p:last-child {
    margin-bottom: 0;
}

.project-note p:last-child {
    color: var(--ink-soft);
}

/* Error pages */

.error-page-body .site-main {
    display: grid;
    align-items: center;
}

.error-page {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(16rem, 0.38fr);
    align-items: end;
    gap: clamp(1.5rem, 5vw, 4rem);
    padding-block: clamp(4rem, 12vw, 8rem);
}

.error-page__panel {
    max-width: 47rem;
}

.error-code {
    margin-bottom: -0.7rem;
    color: var(--paper-deep);
    font-family: ui-serif, Georgia, Cambria, serif;
    font-size: clamp(5rem, 16vw, 10rem);
    font-weight: 700;
    line-height: 0.75;
    letter-spacing: -0.07em;
    user-select: none;
}

.error-page__panel h1 {
    max-width: 13ch;
}

.error-page__explanation {
    max-width: 41rem;
    margin-bottom: 1.5rem;
    color: var(--muted);
    font-size: 1.06rem;
}

.error-page__note {
    padding: 1.15rem;
    background: var(--surface);
    border: 1px solid var(--line);
    border-top: 4px solid var(--accent);
    border-radius: var(--radius);
}

.error-page__note strong {
    display: block;
    margin-bottom: 0.25rem;
}

.error-page__note p {
    margin: 0;
    color: var(--muted);
    font-size: 0.9rem;
}

/* Footer */

.site-footer {
    padding-block: 1.25rem;
    color: var(--muted);
    background: var(--surface);
    border-top: 1px solid var(--line);
    font-size: 0.78rem;
}

.site-footer__inner,
.site-footer__inner p,
.site-footer nav {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
}

.site-footer__inner {
    justify-content: space-between;
    gap: 0.8rem 2rem;
}

.site-footer__inner p {
    gap: 0.55rem;
    margin: 0;
}

.site-footer__inner p span::before {
    content: "|";
    margin-right: 0.55rem;
}

.site-footer nav {
    gap: 1rem;
}

.site-footer a {
    color: var(--ink-soft);
    font-weight: 650;
}

/* Responsive adjustments */

@media (max-width: 1110px) {
    .site-header__inner {
        gap: 0.8rem;
    }

    .primary-navigation {
        gap: 0;
    }

    .nav-link,
    .notification-link {
        padding-inline: 0.45rem;
        font-size: 0.82rem;
    }

    .nav-link::after,
    .notification-link::after {
        right: 0.45rem;
        left: 0.45rem;
    }

    .profile-link__text,
    .logout-form {
        display: none;
    }
}

@media (max-width: 991.98px) {
    .primary-navigation,
    .guest-navigation,
    .header-account {
        display: none;
    }

    .mobile-navigation {
        display: block;
    }

    .landing-hero__grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .landing-introduction {
        max-width: 44rem;
    }

    .landing-introduction h1 {
        max-width: 12ch;
    }

    .demo-panel {
        max-width: 43rem;
    }

    .error-page {
        grid-template-columns: 1fr;
        align-items: start;
    }

    .error-page__note {
        max-width: 35rem;
    }
}

@media (max-width: 767.98px) {
    .app-container,
    .container,
    .page-heading,
    .breadcrumbs,
    .chat-panel,
    .notification-list,
    .pagination-region,
    .site-main > .empty-state,
    .site-main > [data-notification-status] {
        width: min(calc(100% - 2rem), var(--content-width));
    }

    .brand__strapline {
        display: none;
    }

    .page-header,
    .page-heading,
    .section-heading--split,
    .project-note__inner {
        display: grid;
        grid-template-columns: 1fr;
        align-items: start;
    }

    .page-header .button-row {
        width: 100%;
    }

    .project-note__rule {
        width: 3.5rem;
        height: 4px;
    }

    .feature-ledger li {
        grid-template-columns: 2.5rem minmax(0, 1fr);
        align-items: start;
        gap: 0.8rem;
    }

    .feature-ledger__label {
        grid-column: 2;
        justify-self: start;
    }

    .notification-row {
        align-items: flex-start;
    }

    .chat-message {
        max-width: 86%;
    }
}

@media (max-width: 575.98px) {
    .site-header,
    .site-header__inner {
        min-height: 62px;
    }

    .brand__mark {
        width: 27px;
        height: 31px;
    }

    .brand__name {
        font-size: 1.05rem;
    }

    .menu-toggle {
        padding-inline: 0.6rem;
    }

    .landing-hero {
        padding-block: 2.75rem 3.5rem;
    }

    .landing-introduction h1 {
        font-size: clamp(2.7rem, 15vw, 4rem);
    }

    .button-row {
        display: grid;
        grid-template-columns: 1fr;
    }

    .button-row .button,
    .button-row .btn {
        width: 100%;
    }

    .avatar--profile {
        width: 4rem;
        height: 4rem;
        font-size: 1.35rem;
    }

    .search-form-row,
    .feedback-summary {
        grid-template-columns: 1fr;
    }

    .search-form-row .button {
        width: 100%;
    }

    .notification-row {
        display: grid;
        gap: 0.8rem;
        padding: 0.9rem;
    }

    .notification-row .button {
        width: 100%;
    }

    .chat-log {
        height: min(55vh, 30rem);
        padding: 0.85rem;
    }

    .chat-message {
        max-width: 92%;
    }

    .chat-composer {
        grid-template-columns: 1fr;
        padding: 0.85rem;
    }

    .chat-composer__actions {
        width: 100%;
        grid-template-columns: 1fr auto;
        align-items: center;
        justify-items: start;
    }

    .landing-notes {
        grid-template-columns: 1fr;
    }

    .demo-panel__header {
        display: grid;
    }

    .demo-panel__status {
        justify-self: start;
    }

    .runtime-list div {
        grid-template-columns: 1fr;
        gap: 0.08rem;
    }

    .runtime-list dd {
        text-align: left;
    }

    .demo-account {
        grid-template-columns: 1fr 1fr;
    }

    .demo-account strong {
        grid-column: 1 / -1;
    }

    .site-footer__inner {
        align-items: flex-start;
        flex-direction: column;
    }
}

@media (max-width: 374px) {
    .app-container,
    .container,
    .page-heading,
    .breadcrumbs,
    .chat-panel,
    .notification-list,
    .pagination-region,
    .site-main > .empty-state,
    .site-main > [data-notification-status] {
        width: min(calc(100% - 1.5rem), var(--content-width));
    }

    .menu-toggle > span:nth-child(2) {
        position: absolute;
        width: 1px;
        height: 1px;
        overflow: hidden;
        clip: rect(0, 0, 0, 0);
    }

    .demo-account {
        grid-template-columns: 1fr;
    }

    .demo-account strong {
        grid-column: auto;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
    }
}

@media print {
    .site-header,
    .site-footer,
    .button-row,
    .flash-region {
        display: none !important;
    }

    body,
    .landing-section,
    .project-note {
        background: #fff;
    }

    .site-main {
        display: block;
    }
}