:root {
  color-scheme: light;
  --bg: #f8fafc;
  --card: #ffffff;
  --line: #e2e8f0;
  --text: #0f172a;
  --muted: #64748b;
  --accent: #111827;
  --approved: #166534;
  --approved-bg: #dcfce7;
  --recovery: #92400e;
  --recovery-bg: #fef3c7;
  --pending: #475569;
  --pending-bg: #e2e8f0;
  --dropped: #b91c1c;
  --dropped-bg: #fee2e2;
}

* {
  box-sizing: border-box;
}

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

body.centered {
  display: grid;
  place-items: center;
  padding: 24px;
}

.shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 40px 0;
}

.topbar {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
}

.card {
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--card);
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.04);
}

.auth-card {
  width: min(100%, 420px);
  padding: 28px;
}

.catalog-card {
  width: 100%;
  padding: 32px;
}

.catalog-header,
.section-head {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 16px;
}

.student-card {
  padding: 24px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: clamp(2rem, 5vw, 2.5rem);
  line-height: 1.05;
}

h2 {
  font-size: 1.6rem;
}

.muted {
  margin-top: 10px;
  color: var(--muted);
  line-height: 1.5;
}

.form {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.field {
  display: grid;
  gap: 8px;
}

.field span {
  color: var(--muted);
  font-size: 0.92rem;
}

.field input {
  min-height: 48px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  color: var(--text);
  font: inherit;
}

.field input:focus {
  outline: 2px solid transparent;
  border-color: #94a3b8;
}

.button,
.ghost-button {
  min-height: 48px;
  padding: 0 18px;
  border: 0;
  border-radius: 999px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

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

.ghost-button {
  background: #fff;
  color: var(--text);
  border: 1px solid var(--line);
}

.link-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  white-space: nowrap;
}

.hint,
.feedback {
  margin-top: 14px;
  font-size: 0.92rem;
}

code {
  padding: 2px 6px;
  border-radius: 8px;
  background: #f1f5f9;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.9em;
}

.hint {
  color: var(--muted);
}

.feedback {
  min-height: 22px;
  color: #b91c1c;
}

.dataset-list {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.teacher-dataset-list {
  display: grid;
  gap: 18px;
  margin-top: 24px;
}

.dataset-link {
  display: block;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 18px;
  color: inherit;
  text-decoration: none;
  background: #fcfdff;
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.dataset-link:hover {
  border-color: #cbd5e1;
  transform: translateY(-1px);
  box-shadow: 0 12px 24px rgba(15, 23, 42, 0.06);
}

.dataset-link strong {
  display: block;
  margin-top: 6px;
  font-size: 1.05rem;
}

.dataset-link span {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  line-height: 1.5;
}

.dataset-kicker {
  margin-top: 0;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.teacher-dataset-card {
  border: 1px solid var(--line);
  border-radius: 24px;
  background: #fcfdff;
  padding: 24px;
}

.teacher-dataset-head {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 16px;
}

.teacher-summary-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
  margin-top: 20px;
}

.summary-card {
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fff;
}

.summary-card span {
  display: block;
  margin-top: 0;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.4;
}

.summary-card strong {
  display: block;
  margin-top: 8px;
  font-size: 1.55rem;
  line-height: 1;
  color: var(--text);
}

.summary-card.approved {
  color: var(--approved);
  background: var(--approved-bg);
  border-color: #bbf7d0;
}

.summary-card.approved strong,
.summary-card.approved span {
  color: var(--approved);
}

.summary-card.recovery {
  color: var(--recovery);
  background: var(--recovery-bg);
  border-color: #fde68a;
}

.summary-card.recovery strong,
.summary-card.recovery span {
  color: var(--recovery);
}

.summary-card.pending {
  color: var(--pending);
  background: var(--pending-bg);
  border-color: #cbd5e1;
}

.summary-card.pending strong,
.summary-card.pending span {
  color: var(--pending);
}

.summary-card.dropped {
  color: var(--dropped);
  background: var(--dropped-bg);
  border-color: #fecaca;
}

.summary-card.dropped strong,
.summary-card.dropped span {
  color: var(--dropped);
}

.teacher-table-wrap {
  margin-top: 18px;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fff;
}

.teacher-table {
  width: 100%;
  min-width: 760px;
  border-collapse: collapse;
}

.teacher-table thead th {
  border-top: 0;
  background: #f8fafc;
}

.teacher-table th,
.teacher-table td {
  padding: 12px 10px;
  border-top: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.teacher-table th {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.teacher-student-name {
  font-weight: 700;
}

.teacher-student-meta {
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.84rem;
}

.teacher-student-cards {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.teacher-student-card {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fff;
  padding: 16px;
}

.teacher-student-card-head {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 12px;
}

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

.teacher-info-item {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fcfdff;
  padding: 12px;
}

.teacher-info-item dt {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.teacher-info-item dd {
  margin: 8px 0 0;
  color: var(--text);
  font-size: 1rem;
  font-weight: 700;
}

.desktop-only {
  display: block;
}

.mobile-only {
  display: none;
}

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

.status {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 12px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 700;
}

.status.approved {
  color: var(--approved);
  background: var(--approved-bg);
}

.status.recovery {
  color: var(--recovery);
  background: var(--recovery-bg);
}

.status.pending {
  color: var(--pending);
  background: var(--pending-bg);
}

.status.dropped {
  color: var(--dropped);
  background: var(--dropped-bg);
}

.grades {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 24px;
}

.grade-card {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fcfdff;
}

.grade-card span {
  display: block;
  color: var(--muted);
  font-size: 0.88rem;
}

.grade-card strong {
  display: block;
  margin-top: 10px;
  font-size: 2rem;
  line-height: 1;
}

.notes-row {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

#student-obs {
  margin-top: 8px;
  line-height: 1.6;
}

@media (max-width: 640px) {
  .topbar,
  .student-head,
  .catalog-header,
  .section-head,
  .teacher-dataset-head {
    flex-direction: column;
  }

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

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

  .desktop-only {
    display: none;
  }

  .mobile-only {
    display: grid;
  }

  .ghost-button {
    width: 100%;
  }
}

@media (max-width: 920px) {
  .shell {
    width: min(100%, calc(100% - 24px));
    padding: 24px 0;
  }

  .catalog-card,
  .student-card {
    padding: 20px;
  }

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