:root {
  --bg: #f4f7f9;
  --panel: #ffffff;
  --line: #cfd8df;
  --ink: #1f2f39;
  --muted: #4f6775;
  --accent: #0b6a73;
  --accent-soft: #d9eef0;
  --danger: #a12626;
  --shadow: 0 14px 28px rgba(31, 47, 57, 0.12);
  --font-head: "Avenir Next", "Segoe UI", sans-serif;
  --font-body: "Source Sans Pro", "Trebuchet MS", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-body);
  background:
    radial-gradient(700px 360px at 2% 2%, rgba(11, 106, 115, 0.12), transparent 60%),
    linear-gradient(160deg, #edf3f5, #f7f1e8);
}

.app {
  width: min(1200px, 95vw);
  margin: 1.2rem auto 2rem;
  display: grid;
  gap: 1rem;
}

.hero,
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 1rem 1.1rem;
}

.kicker {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  font-family: var(--font-head);
  font-size: 0.8rem;
}

h1,
h2 {
  margin: 0.35rem 0;
  font-family: var(--font-head);
}

p {
  margin: 0.3rem 0;
}

label {
  display: grid;
  gap: 0.3rem;
}

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

input[type="text"],
input[type="number"],
input[type="date"],
select,
textarea {
  border: 1px solid #bfcad2;
  border-radius: 10px;
  padding: 0.5rem 0.6rem;
  background: #fff;
}

button {
  border: 1px solid #2f6970;
  border-radius: 10px;
  padding: 0.45rem 0.7rem;
  background: var(--accent-soft);
  color: #11353a;
  cursor: pointer;
}

button:hover {
  filter: brightness(0.97);
}

button.danger {
  border-color: var(--danger);
  color: #7f1616;
  background: #f7e3e3;
}

.meta {
  display: grid;
  gap: 0.8rem;
  grid-template-columns: repeat(4, minmax(150px, 1fr));
  align-items: end;
}

.class-add-wrap {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.5rem;
  align-items: end;
}

.grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr 1.15fr;
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.8rem;
}

.class-tabs {
  display: flex;
  gap: 0.45rem;
  flex-wrap: wrap;
  margin: 0.4rem 0 0.5rem;
}

.class-tab {
  background: #eef3f6;
  border-color: #9bb2c0;
  color: #1f3e4b;
}

.class-tab.is-active {
  background: #0b6a73;
  border-color: #0b6a73;
  color: #fff;
}

.hint {
  color: var(--muted);
  margin-bottom: 0.6rem;
}

.column-list {
  display: grid;
  gap: 0.65rem;
}

.column-card {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.65rem;
  background: #fdfdfc;
}

.row {
  display: grid;
  gap: 0.55rem;
  grid-template-columns: 1.2fr 0.7fr 0.7fr;
  margin-bottom: 0.55rem;
}

.row-small {
  grid-template-columns: 1fr auto;
  align-items: center;
}

.card-actions {
  display: flex;
  gap: 0.4rem;
}

.check {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.table-wrap {
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 12px;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 620px;
}

th,
td {
  border-bottom: 1px solid #d9e2e7;
  border-right: 1px solid #e2eaef;
  padding: 0.45rem;
  vertical-align: top;
}

th {
  background: #eff6f8;
  text-align: left;
}

td input {
  width: 100%;
}

.summary-grid {
  display: grid;
  gap: 0.6rem;
  grid-template-columns: repeat(4, minmax(120px, 1fr));
}

.summary-grid article {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.65rem;
  background: #fcfefe;
}

.summary-grid .label {
  color: var(--muted);
}

.summary-grid .value {
  font-size: 1.35rem;
  font-weight: 700;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

@media (max-width: 980px) {
  .grid,
  .meta,
  .summary-grid,
  .row,
  .class-add-wrap {
    grid-template-columns: 1fr;
  }
}

@media print {
  .actions,
  .hint,
  .card-actions,
  #add-column,
  #add-class,
  #new-class-name {
    display: none !important;
  }
  body {
    background: #fff;
  }
  .hero,
  .panel,
  .column-card {
    box-shadow: none;
  }
}