:root {
  --bg: #f4f2ed;
  --surface: #ffffff;
  --surface-soft: #faf8f5;
  --ink: #1f2937;
  --muted: #6b7280;
  --line: #d8ddd4;
  --accent: #1f3c88;
  --accent-soft: #e4e9f7;
  --present: #1f3c88;
  --present-soft: #e4e9f7;
  --absent: #6d7480;
  --absent-soft: #eef1f5;
  --danger: #b3261e;
  --danger-soft: #fbeceb;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

.app {
  width: min(1180px, calc(100% - 20px));
  margin: 12px auto 28px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
}

.stack-form {
  display: grid;
  gap: 12px;
}

.topbar,
.toolbar,
.panel {
  padding: 18px;
}

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

.brand-block {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.brand-logo {
  width: 42px;
  height: 42px;
  object-fit: contain;
  background: #fff;
}

h1, h2 { margin: 0; line-height: 1.1; }
h1 { font-size: 2rem; }
h2 { font-size: 1.1rem; }

.eyebrow {
  margin: 0 0 6px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.subtitle,
.muted {
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.5;
}

button,
input,
select {
  font: inherit;
}

button {
  border: 0;
  border-radius: 12px;
  padding: 11px 14px;
  cursor: pointer;
  background: var(--accent);
  color: #fff;
}

button:hover { opacity: 0.95; }

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.secondary-btn {
  align-self: flex-start;
}

.ghost-btn {
  background: var(--surface-soft);
  color: var(--ink);
  border: 1px solid var(--line);
}

.danger-btn {
  color: var(--danger);
  border-color: #e9c9c7;
}

.danger-btn:hover {
  background: var(--danger-soft);
}

label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 0.92rem;
}

input,
select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 11px 12px;
  background: var(--surface-soft);
  color: var(--ink);
}

input:focus,
select:focus {
  outline: 2px solid rgba(31, 60, 136, 0.16);
  border-color: var(--accent);
}

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

.control-tile {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface-soft);
  display: grid;
  gap: 10px;
}

.control-tile h2 {
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.control-tile label {
  gap: 0;
}

.stats {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.stats span {
  display: inline-flex;
  align-items: center;
  padding: 8px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid #cfe3e2;
  font-size: 0.85rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.wide { grid-column: 1 / -1; }

.card-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: flex-start;
  margin-bottom: 14px;
}

.attendance-table,
.student-list {
  display: grid;
  gap: 10px;
}

.attendance-overview {
  display: grid;
  gap: 12px;
  margin-bottom: 0;
}

.overview-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.overview-tile {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface-soft);
  padding: 10px 12px;
}

.overview-tile-sub {
  width: 100%;
}

.overview-label {
  display: block;
  color: var(--muted);
  font-size: 0.82rem;
}

.overview-value {
  display: block;
  margin-top: 4px;
  font-size: 1.4rem;
  font-weight: 700;
}

.overview-tile.present .overview-value {
  color: var(--present);
}

.overview-tile.absent .overview-value {
  color: var(--danger);
}

.overview-tile.not-marked .overview-value {
  color: #6b7280;
}

.bars {
  display: grid;
  gap: 10px;
}

.bar-row {
  display: grid;
  grid-template-columns: 82px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
}

.bar-label {
  color: var(--muted);
  font-size: 0.86rem;
}

.bar-track {
  height: 10px;
  background: #e9edf3;
  border-radius: 999px;
  overflow: hidden;
}

.bar-fill {
  display: block;
  height: 100%;
  width: 0;
  border-radius: 999px;
}

.bar-fill.present {
  background: var(--present);
}

.bar-fill.absent {
  background: var(--danger);
}

.bar-fill.not-marked {
  background: #8b94a3;
}

.bar-value {
  color: var(--ink);
  font-size: 0.86rem;
  font-weight: 600;
}

.table-head,
.table-row,
.student-row {
  display: grid;
  grid-template-columns: 90px minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface-soft);
}

.table-head {
  background: transparent;
  border: 0;
  padding: 0 2px 4px;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
}

.attendance-choice {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--ink);
}

.chip input {
  width: auto;
  margin: 0;
}

.chip.active {
  background: var(--accent-soft);
  border-color: #c9d4f2;
}

.chip.active input {
  accent-color: var(--accent);
}

.footer-actions {
  display: flex;
  justify-content: flex-end;
  padding: 2px 0 0;
}

.student-row strong {
  display: block;
}

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

.empty {
  margin: 0;
  padding: 10px 0 2px;
  color: var(--muted);
}

.hidden { display: none; }

@media (max-width: 900px) {
  .toolbar,
  .grid {
    grid-template-columns: 1fr;
  }

  .topbar {
    flex-direction: column;
  }
}

@media (max-width: 640px) {
  .app {
    width: min(100% - 14px, 1180px);
    margin-top: 8px;
  }

  .topbar,
  .toolbar,
  .panel {
    padding: 14px;
  }

  .footer-actions {
    justify-content: stretch;
  }

  .footer-actions button {
    width: 100%;
  }

  .brand-copy h1 {
    font-size: 1.65rem;
  }

  .table-head,
  .table-row,
  .student-row {
    grid-template-columns: 1fr;
  }

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

  .bar-row {
    grid-template-columns: 70px minmax(0, 1fr) auto;
  }
}