:root {
  color-scheme: light;
  --bg: #f6f7f4;
  --panel: #ffffff;
  --panel-strong: #eef3ec;
  --ink: #1f2724;
  --muted: #64716d;
  --line: #d7ddd8;
  --accent: #2f6f56;
  --accent-strong: #214f3f;
  --danger: #a33b3b;
  --link: #235f9f;
  --shadow: 0 18px 50px rgba(31, 39, 36, 0.08);
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 24px clamp(20px, 5vw, 64px);
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.82);
}

.brand-lockup {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.app-icon {
  flex: 0 0 auto;
  width: 56px;
  height: 56px;
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: 0 10px 24px rgba(31, 39, 36, 0.12);
  object-fit: cover;
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
}

h1,
h2,
h3,
p,
dl {
  margin: 0;
}

h1 {
  font-size: clamp(1.6rem, 3vw, 2.25rem);
  letter-spacing: 0;
}

h2 {
  font-size: 1.08rem;
  letter-spacing: 0;
}

h3 {
  font-size: 1.35rem;
  letter-spacing: 0;
}

.session {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
  min-height: 42px;
  color: var(--muted);
  font-size: 0.95rem;
}

.session img {
  width: 32px;
  height: 32px;
  border-radius: 50%;
}

main {
  padding-bottom: 48px;
}

.home-view {
  display: grid;
  gap: 28px;
  width: min(1080px, calc(100% - 40px));
  margin: 34px auto 0;
}

.home-hero {
  display: grid;
  justify-items: start;
  gap: 16px;
  border-bottom: 1px solid var(--line);
  padding: 8px 0 30px;
}

.home-icon {
  width: 112px;
  height: 112px;
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: 0 16px 36px rgba(31, 39, 36, 0.14);
  object-fit: cover;
}

.home-hero h2 {
  max-width: 760px;
  font-size: clamp(2rem, 5vw, 4rem);
  line-height: 1.02;
}

.home-lede {
  max-width: 780px;
  color: var(--muted);
  font-size: 1.08rem;
  line-height: 1.65;
}

.home-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 4px;
}

.primary-link-button,
.secondary-link-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  border-radius: 6px;
  padding: 0 16px;
  font-weight: 750;
  text-decoration: none;
}

.primary-link-button {
  background: var(--accent);
  color: #fff;
}

.primary-link-button:hover {
  background: var(--accent-strong);
}

.secondary-link-button {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
}

.secondary-link-button:hover {
  border-color: rgba(35, 95, 159, 0.42);
  color: var(--link);
}

.home-details {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.home-details section {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  padding: 18px;
}

.home-details h3 {
  font-size: 1rem;
}

.home-details p {
  margin-top: 10px;
  color: var(--muted);
  line-height: 1.55;
}

.summary-band {
  border-bottom: 1px solid var(--line);
  background: var(--panel-strong);
  padding: 18px clamp(20px, 5vw, 64px);
}

.class-detail-bar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(220px, 320px);
  gap: 20px;
  align-items: end;
}

.class-detail-main {
  display: grid;
  gap: 8px;
  min-width: 0;
}

.class-display {
  display: grid;
  gap: 12px;
}

.summary-details {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.summary-details div {
  min-width: 0;
}

.summary-message {
  color: var(--muted);
  font-weight: 650;
}

.summary-org-control {
  display: grid;
  gap: 7px;
  position: relative;
}

.summary-org-control[hidden] {
  display: none;
}

.summary-link {
  color: var(--link);
  font-size: 0.84rem;
  font-weight: 750;
  text-decoration: none;
}

.summary-link:hover {
  text-decoration: underline;
}

.org-dropdown {
  position: relative;
}

.org-dropdown-button {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto 18px;
  gap: 10px;
  align-items: center;
  width: 100%;
  border: 1px solid rgba(31, 39, 36, 0.12);
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
  padding: 10px 12px;
  text-align: left;
}

.org-dropdown-button:hover:not(:disabled),
.org-dropdown-button:focus {
  border-color: rgba(47, 111, 86, 0.5);
  background: #fff;
}

.org-selected-label {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.org-selected-label strong,
.org-choice strong {
  overflow-wrap: anywhere;
  color: var(--ink);
  font-size: 0.9rem;
}

.org-selected-label small,
.org-choice small,
.org-empty {
  color: var(--muted);
  font-size: 0.8rem;
}

.org-dropdown-chevron {
  position: relative;
  width: 18px;
  height: 18px;
}

.org-dropdown-chevron::before {
  position: absolute;
  top: 4px;
  left: 4px;
  width: 7px;
  height: 7px;
  border-right: 2px solid var(--muted);
  border-bottom: 2px solid var(--muted);
  content: "";
  transform: rotate(45deg);
}

.org-list {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  left: 0;
  z-index: 30;
  display: grid;
  gap: 4px;
  max-height: 280px;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  box-shadow: 0 16px 36px rgba(31, 39, 36, 0.14);
  padding: 4px;
}

.org-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  width: 100%;
  min-height: 0;
  border: 1px solid transparent;
  border-radius: 4px;
  background: transparent;
  color: var(--ink);
  padding: 9px 10px;
  text-align: left;
}

.org-row.is-selected {
  border-color: rgba(47, 111, 86, 0.5);
  background: var(--panel-strong);
}

.org-row:hover:not(:disabled),
.org-row:focus {
  background: var(--panel-strong);
}

.org-choice {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

.org-choice span {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.org-choice .org-help {
  color: var(--danger);
}

.org-status-badge {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 8px;
  font-size: 0.76rem;
  font-weight: 800;
  line-height: 1;
  white-space: nowrap;
}

.org-status-badge.is-ready {
  border-color: rgba(47, 111, 86, 0.35);
  background: rgba(47, 111, 86, 0.1);
  color: var(--accent-strong);
}

.org-status-badge.is-warning {
  border-color: rgba(163, 59, 59, 0.26);
  background: rgba(163, 59, 59, 0.08);
  color: var(--danger);
}

.summary-band .class-setup-form {
  margin-top: 16px;
}

dt {
  color: var(--muted);
  font-size: 0.74rem;
  font-weight: 700;
  text-transform: uppercase;
}

dd {
  margin: 4px 0 0;
  overflow-wrap: anywhere;
  font-weight: 650;
}

.workspace,
.instructor-view,
.assignment-view {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(300px, 0.85fr);
  gap: 24px;
  width: min(1180px, calc(100% - 40px));
  margin: 28px auto 0;
}

.assignment-view {
  grid-template-columns: minmax(0, 720px);
  justify-content: center;
}

.tool-panel,
.result-panel,
.assignment-main {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.instructor-view {
  grid-template-columns: 1fr;
  align-items: start;
}

.class-panel,
.assignment-panel,
.section-panel {
  grid-column: 1 / -1;
}

.tool-panel,
.assignment-main {
  display: grid;
  gap: 18px;
  padding: 24px;
}

.assignment-state {
  display: grid;
  gap: 18px;
}

.inline-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr)) auto;
  gap: 12px;
  align-items: end;
}

.inline-form button {
  min-width: 140px;
}

.class-setup-form {
  grid-template-columns: minmax(0, 1fr) auto;
}

.class-body {
  display: grid;
  gap: 12px;
}

.class-summary {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 18px;
  align-items: start;
}

.class-title-row {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.class-title-row h2,
.class-title-row h3 {
  overflow-wrap: anywhere;
}

.class-meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 12px;
}

.list-stack {
  display: grid;
  gap: 10px;
}

.list-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 12px;
}

.list-item strong {
  display: block;
  overflow-wrap: anywhere;
}

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

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.button-row button,
.small-button {
  min-height: 34px;
  padding: 0 10px;
  font-size: 0.88rem;
}

.tooltip-anchor {
  position: relative;
  display: inline-block;
}

.tooltip-anchor > button:disabled {
  pointer-events: none;
}

.tooltip-anchor::after {
  position: absolute;
  right: 0;
  bottom: calc(100% + 8px);
  z-index: 10;
  width: min(260px, 70vw);
  border-radius: 6px;
  background: var(--ink);
  color: #fff;
  content: attr(data-tooltip);
  font-size: 0.78rem;
  font-weight: 650;
  line-height: 1.35;
  opacity: 0;
  padding: 8px 10px;
  pointer-events: none;
  transform: translateY(4px);
  transition: opacity 120ms ease, transform 120ms ease;
}

.tooltip-anchor:hover::after,
.tooltip-anchor:focus-within::after {
  opacity: 1;
  transform: translateY(0);
}

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

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

.data-table th,
.data-table td {
  border-bottom: 1px solid var(--line);
  padding: 10px 8px;
  text-align: left;
  vertical-align: middle;
}

.data-table th {
  color: var(--muted);
  font-size: 0.74rem;
  text-transform: uppercase;
}

.section-details {
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
}

.section-details[open] {
  border-color: rgba(47, 111, 86, 0.42);
}

.section-details summary {
  cursor: pointer;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  padding: 12px;
}

.section-details summary::marker,
.section-details summary::-webkit-details-marker {
  display: none;
  content: "";
}

.section-summary-title {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.section-summary-title strong {
  overflow-wrap: anywhere;
}

.section-disclosure-icon {
  position: relative;
  flex: 0 0 auto;
  width: 20px;
  height: 20px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--panel-strong);
}

.section-disclosure-icon::before {
  position: absolute;
  top: 5px;
  left: 5px;
  width: 6px;
  height: 6px;
  border-right: 2px solid var(--muted);
  border-bottom: 2px solid var(--muted);
  content: "";
  transform: rotate(-45deg);
  transition: transform 140ms ease, top 140ms ease, left 140ms ease;
}

.section-details[open] .section-disclosure-icon::before {
  top: 4px;
  left: 6px;
  transform: rotate(45deg);
}

.section-assignment-row {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr) auto auto;
  gap: 12px;
  align-items: center;
  border-top: 1px solid var(--line);
  padding: 10px 12px;
}

.section-assignment-row strong {
  display: block;
  margin-bottom: 3px;
}

.section-assignment-row.is-updating {
  background: #f8faf7;
}

.section-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-end;
}

.student-link {
  color: var(--link);
  font-size: 0.9rem;
  font-weight: 700;
}

.result-panel {
  min-height: 260px;
  padding: 24px;
}

.form-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.status-pill {
  flex: 0 0 auto;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 10px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
}

label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 650;
}

.autocomplete-field {
  position: relative;
}

.autocomplete-list {
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  left: 0;
  z-index: 20;
  display: grid;
  gap: 2px;
  max-height: 240px;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  box-shadow: 0 16px 36px rgba(31, 39, 36, 0.14);
  padding: 4px;
}

.autocomplete-option {
  display: grid;
  gap: 2px;
  width: 100%;
  min-height: 0;
  border: 0;
  border-radius: 4px;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  padding: 8px 10px;
  text-align: left;
}

.autocomplete-option:hover,
.autocomplete-option:focus {
  background: var(--panel-strong);
}

.autocomplete-option strong {
  overflow-wrap: anywhere;
  font-size: 0.9rem;
}

.autocomplete-option small {
  overflow-wrap: anywhere;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 650;
}

.autocomplete-status {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 38px;
  padding: 8px 10px;
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 700;
}

.autocomplete-spinner {
  width: 14px;
  height: 14px;
  border: 2px solid rgba(47, 111, 86, 0.18);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 700ms linear infinite;
}

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

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
  padding: 11px 12px;
  outline: none;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(47, 111, 86, 0.16);
}

textarea {
  resize: vertical;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(180px, 0.5fr);
  gap: 16px;
  align-items: end;
}

.checkbox-row {
  grid-template-columns: 18px minmax(0, 1fr);
  align-items: center;
  min-height: 43px;
  padding-bottom: 2px;
}

.checkbox-row input {
  width: 18px;
  height: 18px;
}

button {
  min-height: 44px;
  border: 0;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  font-weight: 750;
}

button:hover:not(:disabled) {
  background: var(--accent-strong);
}

button.secondary {
  min-height: 38px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.result-panel p {
  margin-top: 12px;
  color: var(--muted);
  line-height: 1.55;
}

.result-panel a {
  color: var(--link);
  font-weight: 700;
}

.detail-list {
  display: grid;
  gap: 12px;
  margin-top: 20px;
}

.detail-list div {
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

.assignment-meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.assignment-action-text {
  margin: 0;
  color: var(--muted);
  line-height: 1.45;
}

.assignment-action-text a {
  color: var(--link);
  font-weight: 750;
  text-decoration: none;
}

.assignment-action-text a:hover {
  text-decoration: underline;
}

.accept-block {
  display: grid;
  gap: 12px;
  margin-top: 28px;
  border-top: 1px solid var(--line);
  padding-top: 20px;
}

.error {
  color: var(--danger);
}

@media (max-width: 840px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .brand-lockup {
    align-items: flex-start;
  }

  .session {
    justify-content: flex-start;
  }

  .class-detail-bar,
  .summary-details,
  .home-details,
  .workspace,
  .instructor-view,
  .assignment-view,
  .assignment-meta,
  .class-meta,
  .class-summary,
  .inline-form,
  .split {
    grid-template-columns: 1fr;
  }

  .section-assignment-row {
    grid-template-columns: 22px minmax(0, 1fr);
  }

  .section-assignment-row > .small-button,
  .section-links {
    grid-column: 2;
    justify-self: start;
  }

  .section-links {
    justify-content: flex-start;
  }
}