:root {
  --ink: #233047;
  --muted: #667085;
  --line: #dbe3ec;
  --paper: #fbf8f1;
  --card: #fff;
  --sky: #55b9d2;
  --rose: #e8657a;
  --leaf: #63b882;
  --gold: #f2bd49;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background: linear-gradient(135deg, rgba(85,185,210,.16), rgba(242,189,73,.16)), var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.app-shell {
  width: min(1180px, calc(100% - 28px));
  margin: 0 auto;
  padding: 28px 0 46px;
}

.access-panel {
  display: grid;
  grid-template-columns: 1fr minmax(260px, 380px);
  gap: 18px;
  align-items: end;
  margin-bottom: 18px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 14px 34px rgba(35,48,71,.12);
}

.access-panel.is-unlocked {
  display: none;
}

.access-panel h1 {
  font-size: clamp(2rem, 4vw, 3.2rem);
}

#accessForm {
  display: grid;
  gap: 10px;
}

.access-message {
  min-height: 20px;
  margin: 0;
  color: var(--rose);
  font-weight: 800;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 180px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255,255,255,.9);
  box-shadow: 0 14px 34px rgba(35,48,71,.12);
}

.app-header img {
  width: 112px;
  height: 112px;
  object-fit: contain;
}

.kicker {
  margin: 0 0 8px;
  color: var(--rose);
  font-size: .78rem;
  font-weight: 900;
  text-transform: uppercase;
}

h1 {
  margin: 0 0 8px;
  font-size: clamp(2.3rem, 5vw, 4.2rem);
  line-height: .98;
}

.intro {
  margin: 0;
  color: var(--muted);
}

.toolbar {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) 140px 140px 140px 170px 140px 130px;
  gap: 12px;
  margin: 18px 0;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255,255,255,.92);
}

.toolbar button {
  align-self: end;
}

.checkin-details {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 12px;
  margin: -6px 0 18px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255,255,255,.92);
}

.deduct-control {
  align-content: end;
  grid-template-columns: auto 1fr;
  gap: 9px;
  min-height: 44px;
}

.deduct-control input {
  width: 18px;
  min-height: 18px;
}

label {
  display: grid;
  gap: 6px;
  color: #40516a;
  font-size: .9rem;
  font-weight: 800;
}

input,
select {
  min-height: 44px;
  width: 100%;
  border: 1px solid #cdd6e1;
  border-radius: 8px;
  padding: 9px 11px;
  font: inherit;
}

.stats {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 12px;
  margin-bottom: 18px;
}

.stat-card,
.student-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--card);
  box-shadow: 0 10px 24px rgba(35,48,71,.08);
}

.stat-card {
  padding: 16px;
}

.stat-card strong {
  display: block;
  font-size: 1.8rem;
}

.student-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(285px, 1fr));
  gap: 14px;
}

.upload-check {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 14px;
  align-items: start;
  margin-bottom: 18px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255,255,255,.92);
}

.upload-check h2 {
  margin: 0;
  font-size: 1.4rem;
}

.health-results {
  grid-column: 1 / -1;
}

.health-pass,
.health-fail {
  margin: 0 0 10px;
  font-weight: 900;
}

.health-pass {
  color: #2f8b55;
}

.health-fail {
  color: var(--rose);
}

.health-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 10px;
}

.health-grid article {
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.health-grid article.is-ok {
  border-color: rgba(99,184,130,.68);
}

.health-grid article.is-failed {
  border-color: rgba(232,101,122,.78);
}

.health-grid strong,
.health-grid span,
.health-grid small {
  display: block;
}

.health-grid span,
.health-grid small {
  margin-top: 4px;
  color: var(--muted);
}

.health-grid ul {
  margin: 8px 0 0;
  padding-left: 16px;
  color: var(--rose);
  font-size: .78rem;
  overflow-wrap: anywhere;
}

.session-mode {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 16px;
  align-items: center;
  margin-bottom: 18px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255,255,255,.92);
}

.session-mode h2 {
  margin: 0;
  font-size: 1.4rem;
}

.session-totals {
  display: grid;
  grid-template-columns: repeat(3, minmax(88px, 1fr));
  gap: 10px;
}

.session-totals article {
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.session-totals strong,
.session-totals span {
  display: block;
}

.session-totals strong {
  font-size: 1.45rem;
}

.session-totals span {
  color: var(--muted);
  font-size: .78rem;
  font-weight: 900;
  text-transform: uppercase;
}

.recent-panel {
  margin-bottom: 18px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255,255,255,.92);
}

.panel-heading {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  margin-bottom: 12px;
}

.panel-heading h2 {
  margin: 0;
}

.session-list {
  display: grid;
  gap: 8px;
}

.session-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.session-item strong {
  display: block;
}

.session-item span {
  color: var(--muted);
  font-size: .88rem;
}

.session-actions {
  display: grid;
  gap: 6px;
  justify-items: end;
}

.session-actions button {
  min-height: 32px;
  padding: 0 10px;
  background: var(--ink);
  font-size: .82rem;
}

.student-card {
  display: grid;
  gap: 14px;
  padding: 16px;
}

.student-card.is-checked-today {
  border-color: rgba(99,184,130,.72);
  box-shadow: 0 10px 24px rgba(99,184,130,.16);
}

.student-card.needs-reply {
  border-color: rgba(232,101,122,.72);
}

.student-card header,
.student-card footer {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: flex-start;
}

.student-card h2 {
  margin: 0 0 4px;
  font-size: 1.15rem;
}

.student-card p {
  margin: 0;
  color: var(--muted);
}

.credit-pill {
  min-width: 42px;
  padding: 8px 10px;
  border-radius: 999px;
  color: #fff;
  background: var(--leaf);
  text-align: center;
  font-weight: 900;
}

dl {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 9px;
  margin: 0;
}

dt {
  color: var(--muted);
  font-size: .75rem;
  font-weight: 900;
  text-transform: uppercase;
}

dd {
  margin: 2px 0 0;
  font-weight: 800;
}

button {
  min-height: 40px;
  border: 0;
  border-radius: 8px;
  padding: 0 13px;
  color: #fff;
  background: var(--sky);
  font: inherit;
  font-weight: 900;
  cursor: pointer;
}

button[data-action="checkin"] {
  background: var(--rose);
}

button[data-action="profile"] {
  background: var(--ink);
}

button:disabled {
  background: #9aa7b5;
  cursor: not-allowed;
}

dialog {
  width: min(760px, calc(100% - 28px));
  border: 0;
  border-radius: 8px;
  padding: 22px;
}

dialog::backdrop {
  background: rgba(35,48,71,.45);
}

.close-button {
  float: right;
  width: 38px;
  padding: 0;
  background: var(--ink);
}

pre {
  max-height: 520px;
  overflow: auto;
  padding: 14px;
  border-radius: 8px;
  background: #172033;
  color: #f8fbff;
}

@media (max-width: 760px) {
  .app-header,
  .access-panel,
  .toolbar,
  .checkin-details,
  .upload-check,
  .session-mode {
    grid-template-columns: 1fr;
  }

  .app-header {
    display: grid;
  }

  .stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .session-totals {
    grid-template-columns: repeat(3, 1fr);
  }
}