*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #f6f4f0;
  --surface: #eceae4;
  --text: #22211e;
  --text2: #7a756d;
  --border: #ddd9d2;
  --gov: #3d6bab;
  --int: #2e7e76;
  --aca: #a86a2a;
  --pri: #6e5ba3;
  --accent: #3d6bab;
  --font-body: system-ui, -apple-system, "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  --font-heading: "DM Serif Display", Georgia, "Hiragino Mincho ProN", serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #191816;
    --surface: #232220;
    --text: #d5d0c8;
    --text2: #8a847b;
    --border: #35332e;
    --gov: #7aa0d4;
    --int: #5fb8ae;
    --aca: #d4a46a;
    --pri: #a594d0;
    --accent: #7aa0d4;
  }
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* --- Header --- */
.header {
  max-width: 720px;
  width: 100%;
  margin: 0 auto;
  padding: 4rem 1.5rem 0;
}

.title {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 2rem;
}

.search-wrap {
  background: var(--surface);
  margin: 0 -1.5rem;
  padding: 1rem 1.5rem;
}

.search-wrap input {
  width: 100%;
  padding: 0.5rem 0;
  border: none;
  border-bottom: 1px solid var(--border);
  font-size: 1rem;
  background: transparent;
  color: var(--text);
  outline: none;
  transition: border-color 0.15s;
}

.search-wrap input:focus {
  border-bottom-color: var(--text);
}

.search-wrap input::placeholder {
  color: var(--text2);
}

.filters {
  display: flex;
  gap: 0.25rem;
  margin-top: 1.25rem;
  flex-wrap: wrap;
}

.filter {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.375rem 0.75rem;
  border: none;
  border-radius: 4px;
  background: transparent;
  color: var(--text2);
  font-size: 0.8125rem;
  cursor: pointer;
  transition: color 0.15s, background 0.15s;
}

.filter:hover {
  color: var(--text);
}

.filter.active {
  color: var(--text);
  font-weight: 600;
}

.dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  flex-shrink: 0;
}

.dot--gov { background: var(--gov); }
.dot--int { background: var(--int); }
.dot--aca { background: var(--aca); }
.dot--pri { background: var(--pri); }

/* --- Main --- */
.main {
  max-width: 720px;
  width: 100%;
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
  flex: 1;
}

.status {
  font-size: 0.75rem;
  color: var(--text2);
  margin-bottom: 2rem;
  letter-spacing: 0.02em;
}

/* --- Source group --- */
.source-group {
  margin-bottom: 3rem;
}

.source-header {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  margin-bottom: 0.25rem;
}

.source-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
  position: relative;
  top: -1px;
}

.source-name {
  font-family: var(--font-heading);
  font-size: 1.375rem;
  font-weight: 400;
  letter-spacing: -0.01em;
}

.source-provider {
  font-size: 0.6875rem;
  color: var(--text2);
  margin-left: auto;
  white-space: nowrap;
  letter-spacing: 0.02em;
}

.source-meta {
  display: flex;
  gap: 0.75rem;
  font-size: 0.6875rem;
  color: var(--text2);
  padding: 0.375rem 0 0.875rem 1rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0;
}

.source-meta a { color: var(--text2); }
.source-meta a:hover { color: var(--text); }

/* --- Dataset row --- */
.dataset + .dataset {
  border-top: 1px solid var(--border);
}

.dataset:last-child {
  border-bottom: none;
}

.dataset-summary {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.625rem 0.5rem 0.625rem 1rem;
  cursor: pointer;
  transition: background 0.1s;
  list-style: none;
}

.dataset-summary::-webkit-details-marker { display: none; }

.dataset-summary:hover {
  background: var(--surface);
  border-radius: 3px;
}

.dataset-summary-text {
  flex: 1;
  min-width: 0;
}

.dataset-title {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text);
}

.dataset-desc {
  display: block;
  font-size: 0.75rem;
  color: var(--text2);
  line-height: 1.5;
  margin-top: 0.125rem;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.dataset-method {
  font-size: 0.625rem;
  color: var(--text2);
  flex-shrink: 0;
  align-self: flex-start;
  margin-top: 0.25rem;
}

.dataset-arrow {
  font-size: 0.5625rem;
  color: var(--text2);
  flex-shrink: 0;
  opacity: 0.4;
  align-self: flex-start;
  margin-top: 0.3rem;
  transition: transform 0.15s, opacity 0.15s;
}

.dataset-summary:hover .dataset-arrow {
  opacity: 0.8;
}

details[open] > .dataset-summary .dataset-arrow {
  transform: rotate(90deg);
  opacity: 0.8;
}

/* --- Dataset detail (inline) --- */
.dataset-detail {
  padding: 0.5rem 0 1.25rem 1rem;
  font-size: 0.8125rem;
  line-height: 1.7;
}

.dataset-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  margin-bottom: 0.75rem;
}

.tag {
  font-size: 0.625rem;
  padding: 0.125rem 0.375rem;
  border-radius: 2px;
  background: var(--surface);
  color: var(--text2);
}

.dataset-fields {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.25rem 1rem;
  font-size: 0.75rem;
}

.dataset-fields dt {
  color: var(--text2);
}

.dataset-fields dd {
  word-break: break-all;
}

/* --- Empty state --- */
.empty {
  text-align: center;
  padding: 5rem 1rem;
  color: var(--text2);
}

.empty-heading {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.empty-action {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.375rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: transparent;
  color: var(--text);
  font-size: 0.8125rem;
  cursor: pointer;
}

.empty-action:hover {
  background: var(--surface);
}

/* --- Footer --- */
.footer {
  max-width: 720px;
  width: 100%;
  margin: 0 auto;
  padding: 3rem 1.5rem 2rem;
  font-size: 0.6875rem;
  color: var(--text2);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  letter-spacing: 0.02em;
}

/* --- Responsive --- */
@media (max-width: 640px) {
  .header {
    padding: 2.5rem 1rem 0;
  }

  .title {
    font-size: 2rem;
  }

  .search-wrap {
    margin: 0 -1rem;
    padding: 1rem;
  }

  .main, .footer {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .source-provider {
    display: none;
  }
}