:root {
  color-scheme: light;
  --bg: #f5f6f8;
  --panel: #ffffff;
  --panel-soft: #f9fafb;
  --border: #d9dee7;
  --border-strong: #b9c2d0;
  --text: #111827;
  --muted: #5d6878;
  --accent: #0f766e;
  --accent-strong: #115e59;
  --danger: #b42318;
  --code-bg: #101828;
  --code-inline-bg: #edf0f5;
  --content-bg: #ffffff;
  --active-bg: #eefaf7;
  --drop-active-bg: #e7f7f4;
  --tab-hover-bg: #edf7f5;
  --danger-bg: #fff4f2;
  --danger-border: #f2a7a0;
  --quote-text: #344054;
  --code-text: #f9fafb;
  --shadow: 0 12px 28px rgba(17, 24, 39, 0.08);
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0f1217;
  --panel: #171b22;
  --panel-soft: #202631;
  --border: #303846;
  --border-strong: #485366;
  --text: #e7eaf0;
  --muted: #a4adba;
  --accent: #2dd4bf;
  --accent-strong: #5eead4;
  --danger: #fca5a5;
  --code-bg: #080b10;
  --code-inline-bg: #293241;
  --content-bg: #151922;
  --active-bg: #183a37;
  --drop-active-bg: #143532;
  --tab-hover-bg: #1c332f;
  --danger-bg: #351716;
  --danger-border: #7f2a26;
  --quote-text: #c6ccd6;
  --code-text: #f7fafc;
  --shadow: 0 12px 28px rgba(0, 0, 0, 0.34);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
}

button,
input {
  font: inherit;
}

button {
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  min-height: 36px;
  padding: 0 12px;
}

button:hover {
  border-color: var(--accent);
}

.app-heading {
  display: flex;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
}

.app-heading h1 {
  margin: 0;
  font-size: 20px;
  line-height: 1.2;
}

.app-shell {
  display: grid;
  grid-template-columns: minmax(280px, 340px) minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  display: flex;
  flex-direction: column;
  gap: 18px;
  height: 100vh;
  overflow: auto;
  border-right: 1px solid var(--border);
  background: var(--panel);
  padding: 22px;
}

.upload-zone {
  display: grid;
  gap: 8px;
  align-items: center;
  min-height: 154px;
  border: 1px dashed var(--border-strong);
  border-radius: 8px;
  background: var(--panel-soft);
  padding: 18px;
  text-align: center;
  cursor: pointer;
}

.upload-zone.dragging {
  border-color: var(--accent);
  background: var(--drop-active-bg);
}

.upload-zone input {
  display: none;
}

.upload-icon {
  justify-self: center;
  width: 54px;
  height: 34px;
  border-radius: 6px;
  background: var(--accent);
  color: white;
  display: inline-grid;
  place-items: center;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
}

.upload-zone small,
.file-status,
.filter-block label {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.file-status {
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--panel-soft);
  padding: 10px 12px;
}

.file-status.error {
  border-color: var(--danger-border);
  background: var(--danger-bg);
  color: var(--danger);
}

.filter-block {
  display: grid;
  gap: 8px;
}

.filter-block input {
  width: 100%;
  min-height: 38px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--panel);
  color: var(--text);
  padding: 8px 10px;
}

.record-list {
  display: grid;
  gap: 8px;
  padding-bottom: 12px;
}

.record-card {
  display: grid;
  gap: 5px;
  width: 100%;
  min-height: 76px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--panel);
  padding: 10px;
  text-align: left;
}

.record-card.active {
  border-color: var(--accent);
  background: var(--active-bg);
}

.record-card strong {
  font-size: 14px;
}

.record-card span {
  color: var(--muted);
  font-size: 12px;
}

.content {
  min-width: 0;
  padding: 26px;
}

.empty-state {
  display: grid;
  align-content: center;
  min-height: calc(100vh - 52px);
  max-width: 760px;
  margin: 0 auto;
}

.empty-state h2 {
  margin: 0;
  font-size: 32px;
}

.empty-state p {
  color: var(--muted);
  font-size: 16px;
  line-height: 1.7;
}

.hidden {
  display: none !important;
}

.viewer {
  display: grid;
  gap: 18px;
}

.viewer-header {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
  padding-bottom: 16px;
}

.viewer-header h2 {
  margin: 4px 0 0;
  font-size: 28px;
  line-height: 1.2;
}

.eyebrow {
  margin: 0;
  color: var(--accent-strong);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

.viewer-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 10px;
}

.summary-item {
  min-height: 70px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--panel);
  padding: 10px 12px;
}

.summary-item span {
  display: block;
  color: var(--muted);
  font-size: 12px;
}

.summary-item strong {
  display: block;
  margin-top: 6px;
  overflow-wrap: anywhere;
  font-size: 15px;
}

.section-stack {
  min-width: 0;
}

.tabs-shell {
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.tab-list {
  display: flex;
  gap: 0;
  overflow-x: auto;
  border-bottom: 1px solid var(--border);
  background: var(--panel-soft);
}

.tab-button {
  flex: 0 0 auto;
  display: grid;
  gap: 3px;
  min-width: 150px;
  min-height: 58px;
  border: 0;
  border-right: 1px solid var(--border);
  border-radius: 0;
  background: transparent;
  padding: 9px 14px;
  text-align: left;
}

.tab-button:hover {
  background: var(--tab-hover-bg);
}

.tab-button.active {
  background: var(--panel);
  color: var(--accent-strong);
  box-shadow: inset 0 -3px 0 var(--accent);
}

.tab-button span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 14px;
  font-weight: 700;
}

.tab-button small {
  color: var(--muted);
  font-size: 12px;
}

.tab-panel {
  min-width: 0;
}

.tab-body {
  background: var(--content-bg);
  padding: 18px;
}

.markdown-body {
  max-width: 980px;
  color: var(--text);
  font-size: 15px;
  line-height: 1.72;
}

.markdown-body > :first-child {
  margin-top: 0;
}

.markdown-body > :last-child {
  margin-bottom: 0;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3 {
  line-height: 1.25;
}

.markdown-body pre {
  overflow: auto;
  border-radius: 7px;
  background: var(--code-bg);
  color: var(--code-text);
  padding: 14px;
}

.markdown-body code {
  border-radius: 4px;
  background: var(--code-inline-bg);
  padding: 2px 4px;
}

.markdown-body pre code {
  background: transparent;
  padding: 0;
}

.markdown-body blockquote {
  margin-left: 0;
  border-left: 4px solid var(--border-strong);
  color: var(--quote-text);
  padding-left: 14px;
}

.markdown-body table {
  display: block;
  max-width: 100%;
  overflow: auto;
  border-collapse: collapse;
}

.markdown-body th,
.markdown-body td {
  border: 1px solid var(--border);
  padding: 8px 10px;
}

.raw-block {
  overflow: auto;
  max-height: 70vh;
  border-radius: 7px;
  background: var(--code-bg);
  color: var(--code-text);
  padding: 14px;
  font-size: 13px;
  line-height: 1.55;
  white-space: pre-wrap;
}

.verify-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px;
  margin-bottom: 14px;
}

.subsection {
  border-top: 1px solid var(--border);
  margin-top: 18px;
  padding-top: 18px;
}

.subsection h3 {
  margin: 0 0 10px;
  font-size: 15px;
}

.message-list {
  display: grid;
  gap: 12px;
}

.message-card {
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--panel-soft);
  padding: 12px;
}

.message-card h4 {
  margin: 0 0 10px;
  font-size: 14px;
}

@media (max-width: 860px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    height: auto;
  }

  .content {
    padding: 18px;
  }

  .viewer-header {
    display: grid;
  }
}