:root {
  --bg-a: #f4f8fb;
  --bg-b: #e9f1f7;
  --card: #ffffff;
  --ink: #1f2937;
  --muted: #5b6470;
  --line: #d8e2eb;
  --accent: #0f766e;
  --accent-strong: #0b5f59;
  --warn: #b91c1c;
  --ok: #1e3a8a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Noto Sans KR", "Malgun Gothic", sans-serif;
  color: var(--ink);
  background: radial-gradient(circle at top right, #d9e9f5, var(--bg-a) 35%, var(--bg-b));
}

.app {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px;
}

.hero {
  margin-bottom: 16px;
}

.hero h1 {
  margin: 0 0 8px;
}

.hero p {
  margin: 0;
  color: var(--muted);
  line-height: 1.5;
}

.stats {
  margin-top: 12px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.stats span {
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  font-size: 13px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px;
  margin-bottom: 14px;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.05);
}

.card h2 {
  margin: 0 0 10px;
  font-size: 18px;
}

.hint {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 13px;
}

textarea,
input[type="text"],
select,
button,
input[type="file"] {
  font: inherit;
}

textarea,
input[type="text"],
select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px;
  background: #fff;
}

textarea {
  resize: vertical;
}

.row {
  display: flex;
  gap: 8px;
  margin-top: 10px;
  align-items: center;
}

.row.wrap {
  flex-wrap: wrap;
}

button {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 12px;
  background: #f8fafc;
  cursor: pointer;
}

button:hover:not(:disabled) {
  border-color: #9cb3c7;
}

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

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

button.ghost {
  background: #fff;
}

button.danger {
  background: #fee2e2;
  border-color: #fecaca;
  color: var(--warn);
}

button:disabled,
input:disabled,
select:disabled,
textarea:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.question-card {
  border-color: #a7f3d0;
  background: linear-gradient(120deg, #f0fdfa, #ffffff);
}

.question-actions {
  display: grid;
  gap: 8px;
  grid-template-columns: 1fr 1fr;
}

.question-actions button:last-child {
  grid-column: 1 / -1;
}

.chart-wrap {
  width: 100%;
  overflow: auto;
}

canvas {
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
}

.table-wrap {
  overflow: auto;
}

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

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

th {
  font-size: 13px;
  color: var(--muted);
}

td .score {
  display: inline-block;
  min-width: 36px;
  font-variant-numeric: tabular-nums;
}

td .task-text.done {
  color: #94a3b8;
  text-decoration: line-through;
}

.slider-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
}

.slider-wrap input[type="range"] {
  width: 150px;
}

.item-actions {
  display: flex;
  gap: 6px;
}

.item-actions button {
  padding: 6px 8px;
  font-size: 12px;
}

@media (max-width: 760px) {
  .app {
    padding: 14px;
  }

  .row {
    flex-direction: column;
    align-items: stretch;
  }

  .question-actions {
    grid-template-columns: 1fr;
  }

  .question-actions button:last-child {
    grid-column: auto;
  }
}