:root {
  color-scheme: light;
  --bg: #f6f4ee;
  --panel: #ffffff;
  --text: #1f2933;
  --muted: #65717c;
  --line: #d9dee5;
  --accent: #0f766e;
  --accent-dark: #115e59;
  --danger: #a13f3f;
  --shadow: 0 10px 30px rgba(31, 41, 51, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Noto Sans TC", "Segoe UI", sans-serif;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 28px 32px 18px;
}

h1,
h2,
h3,
p {
  margin: 0;
}

h1 {
  font-size: 28px;
  font-weight: 720;
}

h2 {
  font-size: 18px;
}

h3 {
  font-size: 15px;
  margin-bottom: 10px;
}

.topbar p,
.demo-panel p {
  color: var(--muted);
  margin-top: 6px;
}

.status-pill {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  padding: 8px 12px;
  color: var(--muted);
  white-space: nowrap;
}

.layout {
  display: grid;
  grid-template-columns: minmax(300px, 0.9fr) minmax(420px, 1.35fr);
  gap: 18px;
  padding: 0 32px 32px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  min-width: 0;
}

.panel-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px;
  border-bottom: 1px solid var(--line);
}

.filters,
.actions {
  display: flex;
  gap: 8px;
}

input,
select,
textarea,
button {
  border: 1px solid var(--line);
  border-radius: 6px;
  font: inherit;
}

input,
select,
textarea {
  width: 100%;
  padding: 9px 10px;
  color: var(--text);
  background: #fff;
}

textarea {
  min-height: 74px;
  resize: vertical;
}

button {
  min-height: 38px;
  padding: 8px 14px;
  background: #fff;
  color: var(--text);
  cursor: pointer;
}

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

button.primary:hover {
  background: var(--accent-dark);
}

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

.card-list {
  max-height: 720px;
  overflow: auto;
}

.knowledge-card {
  padding: 14px 18px;
  border-bottom: 1px solid var(--line);
  cursor: pointer;
}

.knowledge-card:hover,
.knowledge-card.active {
  background: #edf7f5;
}

.knowledge-card h3 {
  margin: 0 0 8px;
}

.card-preview {
  color: var(--muted);
  display: -webkit-box;
  font-size: 14px;
  line-height: 1.5;
  margin: 0 0 10px;
  overflow: hidden;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
}

.tag {
  border-radius: 999px;
  background: #eef1f4;
  padding: 3px 8px;
}

.tag.pending_review {
  background: #fff1c2;
  color: #765800;
}

.tag.approved {
  background: #dff6ee;
  color: #0f5e45;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  padding: 18px;
}

.note-form {
  display: grid;
  gap: 14px;
  padding: 18px;
}

.note-form textarea {
  min-height: 220px;
}

.recorded-at {
  background: #f7f8f9;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--muted);
  font-size: 14px;
  padding: 10px 12px;
}

label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
}

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

.source-box {
  border-top: 1px solid var(--line);
  padding: 18px;
}

.source-meta {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
  margin-bottom: 10px;
  word-break: break-word;
}

pre {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  color: #34414d;
  background: #f7f8f9;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 12px;
  max-height: 260px;
  overflow: auto;
}

.demo-panel {
  grid-column: 1 / -1;
  padding-bottom: 14px;
}

.demo-panel .panel-heading {
  align-items: center;
}

.demo-panel textarea,
.demo-panel .helper-text {
  margin: 14px 18px 0;
}

.demo-panel textarea {
  width: calc(100% - 36px);
  min-height: 86px;
}

.helper-text {
  color: var(--muted);
  font-size: 14px;
}

.demo-panel button {
  min-width: 150px;
}

@media (max-width: 980px) {
  .topbar,
  .layout {
    padding-left: 16px;
    padding-right: 16px;
  }

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

  .panel-heading,
  .topbar {
    align-items: stretch;
    flex-direction: column;
  }

  .filters,
  .actions {
    width: 100%;
  }
}