:root {
  --bg: #f5f2ea;
  --panel: #fffdfa;
  --panel-strong: #ffffff;
  --ink: #22211e;
  --muted: #6b675f;
  --line: #ddd5c8;
  --accent: #2f6f73;
  --accent-ink: #17464a;
  --danger: #9d3f36;
  --code-bg: #f0ece3;
  --shadow: 0 18px 48px rgba(36, 31, 24, 0.12);
  --radius: 8px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
}

button, input { font: inherit; }

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 292px minmax(0, 1fr);
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto;
  border-right: 1px solid var(--line);
  background: #ede7dc;
  padding: 18px 14px;
}

.brand-block {
  padding: 8px 8px 18px;
  border-bottom: 1px solid rgba(93, 83, 68, 0.22);
  margin-bottom: 16px;
}

.brand-title {
  font-size: 20px;
  font-weight: 750;
  letter-spacing: 0;
}

.brand-subtitle {
  margin-top: 4px;
  color: var(--muted);
  font-size: 13px;
}

.search-label {
  display: block;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  margin: 0 8px 6px;
  text-transform: uppercase;
}

.search-input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--ink);
  padding: 10px 12px;
  outline: none;
}

.search-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(47, 111, 115, 0.16);
}

.doc-list {
  display: grid;
  gap: 4px;
  margin-top: 14px;
}

.doc-button {
  width: 100%;
  display: grid;
  gap: 3px;
  text-align: left;
  border: 0;
  border-radius: var(--radius);
  background: transparent;
  color: var(--ink);
  padding: 10px 10px;
  cursor: pointer;
}

.doc-button:hover { background: rgba(47, 111, 115, 0.09); }
.doc-button.active { background: var(--accent); color: #fff; }
.doc-button.active .doc-meta { color: rgba(255, 255, 255, 0.78); }

.doc-name { font-weight: 720; }
.doc-meta { color: var(--muted); font-size: 12px; }

.main-panel {
  min-width: 0;
  padding: 28px 30px 44px;
}

.mobile-controls {
  display: none;
}

.topbar {
  max-width: 1280px;
  margin: 0 auto 18px;
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 16px;
}

.crumb {
  color: var(--accent-ink);
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 4px;
}

h1 {
  margin: 0;
  font-size: 30px;
  line-height: 1.14;
  letter-spacing: 0;
}

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

.icon-button {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel-strong);
  color: var(--ink);
  padding: 9px 12px;
  cursor: pointer;
}

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

.content-grid {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 18px;
  align-items: start;
}

.markdown-body,
.context-panel {
  background: var(--panel-strong);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.markdown-body {
  min-height: 72vh;
  padding: 34px clamp(22px, 4vw, 58px);
  overflow-wrap: anywhere;
}

.context-panel {
  position: sticky;
  top: 18px;
  padding: 18px;
  display: grid;
  gap: 22px;
}

.context-panel h2 {
  margin: 0 0 10px;
  font-size: 13px;
  text-transform: uppercase;
  color: var(--muted);
  letter-spacing: 0;
}

.link-stack {
  display: grid;
  gap: 7px;
}

.note-link,
.markdown-body a {
  color: var(--accent-ink);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 111, 115, 0.28);
}

.note-link {
  display: block;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fbf8f1;
  padding: 9px 10px;
  cursor: pointer;
}

.note-link:hover,
.markdown-body a:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.empty-state {
  color: var(--muted);
  font-size: 14px;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4 {
  line-height: 1.2;
  letter-spacing: 0;
}

.markdown-body h1 { font-size: 34px; margin: 0 0 24px; }
.markdown-body h2 { font-size: 22px; margin: 34px 0 12px; padding-bottom: 8px; border-bottom: 1px solid var(--line); }
.markdown-body h3 { font-size: 17px; margin: 24px 0 10px; }
.markdown-body h4 { font-size: 15px; margin: 18px 0 8px; }
.markdown-body p { line-height: 1.68; margin: 0 0 14px; }
.markdown-body ul,
.markdown-body ol { margin: 0 0 18px 22px; padding: 0; line-height: 1.62; }
.markdown-body li { margin: 5px 0; }
.markdown-body blockquote {
  margin: 18px 0;
  padding: 12px 16px;
  border-left: 4px solid var(--accent);
  background: #f4f0e7;
  color: #3f3a33;
}
.markdown-body code {
  background: var(--code-bg);
  border: 1px solid #e5dccd;
  border-radius: 5px;
  padding: 1px 5px;
  font-family: "Cascadia Code", "Consolas", monospace;
  font-size: 0.92em;
}
.markdown-body pre {
  overflow: auto;
  background: #211f1c;
  color: #f8f3e7;
  border-radius: var(--radius);
  padding: 16px;
  line-height: 1.55;
}
.markdown-body pre code {
  background: transparent;
  border: 0;
  padding: 0;
  color: inherit;
}
.markdown-body hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 28px 0;
}

mark {
  background: rgba(215, 177, 75, 0.34);
  color: inherit;
  padding: 0 2px;
  border-radius: 3px;
}

.error-box {
  border: 1px solid rgba(157, 63, 54, 0.38);
  background: rgba(157, 63, 54, 0.08);
  color: var(--danger);
  padding: 14px;
  border-radius: var(--radius);
}

@media (max-width: 980px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  .main-panel { padding: 14px 12px 28px; }
  .mobile-controls {
    display: grid;
    gap: 8px;
    background: var(--panel-strong);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 12px;
    margin: 0 0 14px;
    box-shadow: 0 10px 28px rgba(36, 31, 24, 0.08);
  }
  .mobile-select-label { margin-top: 4px; }
  .mobile-doc-select {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--panel);
    color: var(--ink);
    padding: 10px 12px;
    outline: none;
  }
  .mobile-doc-select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(47, 111, 115, 0.16);
  }
  .topbar { flex-direction: column; margin-bottom: 12px; }
  .topbar-actions { justify-content: start; width: 100%; }
  .icon-button { flex: 1; min-width: 110px; }
  .content-grid { grid-template-columns: 1fr; gap: 12px; }
  .markdown-body { min-height: 55vh; padding: 22px 16px; }
  .context-panel { position: relative; top: 0; padding: 14px; }
  h1 { font-size: 24px; }
  .markdown-body h1 { font-size: 26px; }
  .markdown-body h2 { font-size: 19px; margin-top: 28px; }
}

@media (max-width: 520px) {
  .main-panel { padding: 10px 8px 24px; }
  .mobile-controls, .markdown-body, .context-panel { border-radius: 7px; }
  .markdown-body { padding: 18px 13px; }
  .topbar-actions { gap: 6px; }
  .icon-button { padding: 9px 8px; }
  .markdown-body p, .markdown-body li { line-height: 1.58; }
}