:root {
  font-family: 'Noto Sans', 'Segoe UI', Helvetica, Arial, sans-serif;
  line-height: 1.5;
  font-weight: 400;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

:root,
:root[data-theme='light'] {
  color-scheme: light;
  --app-bg: #f4f6fb;
  --app-text: #1f2937;
  --panel-bg: rgba(255, 255, 255, 0.5);
  --panel-border: #d7deea;
  --panel-shadow: 0 8px 24px rgba(16, 24, 40, 0.12);
  --btn-bg: rgba(255, 255, 255, 0.5);
  --btn-fg: #5b6470;
  --btn-hover-bg: #4a90d9;
  --btn-hover-fg: #ffffff;
  --btn-disabled-bg: rgba(207, 213, 223, 0.5);
  --btn-disabled-fg: #8a92a0;
  --overlay-bg: rgba(15, 23, 42, 0.3);
  --tooltip-bg: #111827;
  --tooltip-fg: #f9fafb;
  --muted-text: #6b7280;
  --danger-text: #dc2626;
  --scrollbar-thumb: #d4dae4;
  --scrollbar-thumb-hover: #bbc4d2;
  --focus-ring: #3b82f6;
  --toggle-bg-start: rgba(255, 248, 221, 0.5);
  --toggle-bg-end: rgba(242, 244, 255, 0.5);
  --toggle-thumb-bg: #ffffff;
  --toggle-sun: #f59e0b;
  --toggle-moon: #475569;
  --ghost-text: #7d8796;
  --ghost-code-bg: rgba(15, 23, 42, 0.06);
  --mermaid-max-height: 420px;
  --mermaid-mobile-max-height: 320px;
  --mermaid-action-bg: linear-gradient(180deg, #ffffff 0%, #f4f7fc 100%);
  --mermaid-action-hover-bg: linear-gradient(180deg, #ffffff 0%, #e9f2ff 100%);
  --mermaid-action-fg: #1f2937;
  --mermaid-action-border: #cfd8e6;
  --mermaid-action-shadow: 0 1px 2px rgba(15, 23, 42, 0.08);
  --mermaid-action-shadow-hover: 0 4px 10px rgba(37, 99, 235, 0.16);
  --mermaid-action-disabled-bg: rgba(148, 163, 184, 0.18);
  --mermaid-action-disabled-fg: #9aa4b2;

  --crepe-color-background: #ffffff;
  --crepe-color-on-background: #000000;
  --crepe-color-surface: #f7f7f7;
  --crepe-color-surface-low: #ededed;
  --crepe-color-on-surface: #1c1c1c;
  --crepe-color-on-surface-variant: #4d4d4d;
  --crepe-color-outline: #a8a8a8;
  --crepe-color-primary: #333333;
  --crepe-color-secondary: #cfcfcf;
  --crepe-color-on-secondary: #000000;
  --crepe-color-inverse: #f0f0f0;
  --crepe-color-on-inverse: #1a1a1a;
  --crepe-color-inline-code: #ba1a1a;
  --crepe-color-error: #ba1a1a;
  --crepe-color-hover: #e0e0e0;
  --crepe-color-selected: #d5d5d5;
  --crepe-color-inline-area: #cacaca;
}

:root[data-theme='dark'] {
  color-scheme: dark;
  --app-bg: #0f1117;
  --app-text: #e5e7eb;
  --panel-bg: rgba(26, 30, 39, 0.5);
  --panel-border: #2f3644;
  --panel-shadow: 0 10px 26px rgba(0, 0, 0, 0.5);
  --btn-bg: rgba(34, 40, 52, 0.5);
  --btn-fg: #d2d8e4;
  --btn-hover-bg: #6ea8ff;
  --btn-hover-fg: #0d1117;
  --btn-disabled-bg: rgba(46, 52, 65, 0.5);
  --btn-disabled-fg: #7a8498;
  --overlay-bg: rgba(2, 6, 23, 0.65);
  --tooltip-bg: #f8fafc;
  --tooltip-fg: #0f172a;
  --muted-text: #aeb6c5;
  --danger-text: #f87171;
  --scrollbar-thumb: #40485a;
  --scrollbar-thumb-hover: #5f6980;
  --focus-ring: #60a5fa;
  --toggle-bg-start: rgba(45, 49, 64, 0.5);
  --toggle-bg-end: rgba(31, 36, 48, 0.5);
  --toggle-thumb-bg: #dbe3f2;
  --toggle-sun: #fbbf24;
  --toggle-moon: #e2e8f0;
  --ghost-text: #95a0b4;
  --ghost-code-bg: rgba(226, 232, 240, 0.12);
  --mermaid-action-bg: linear-gradient(180deg, #30394b 0%, #242c3a 100%);
  --mermaid-action-hover-bg: linear-gradient(180deg, #3a4760 0%, #2a3445 100%);
  --mermaid-action-fg: #e5e7eb;
  --mermaid-action-border: #3e4a61;
  --mermaid-action-shadow: 0 1px 2px rgba(2, 6, 23, 0.45);
  --mermaid-action-shadow-hover: 0 5px 12px rgba(2, 6, 23, 0.55);
  --mermaid-action-disabled-bg: rgba(82, 93, 110, 0.3);
  --mermaid-action-disabled-fg: #9aa4b2;

  --crepe-color-background: #1a1a1a;
  --crepe-color-on-background: #e6e6e6;
  --crepe-color-surface: #121212;
  --crepe-color-surface-low: #1c1c1c;
  --crepe-color-on-surface: #d1d1d1;
  --crepe-color-on-surface-variant: #a9a9a9;
  --crepe-color-outline: #757575;
  --crepe-color-primary: #b5b5b5;
  --crepe-color-secondary: #4d4d4d;
  --crepe-color-on-secondary: #d6d6d6;
  --crepe-color-inverse: #e5e5e5;
  --crepe-color-on-inverse: #2a2a2a;
  --crepe-color-inline-code: #ff6666;
  --crepe-color-error: #ff6666;
  --crepe-color-hover: #232323;
  --crepe-color-selected: #2f2f2f;
  --crepe-color-inline-area: #2b2b2b;
}

:root[data-theme='light'] .milkdown {
  --crepe-color-background: transparent;
  --crepe-color-on-background: #000000;
  --crepe-color-surface: rgba(247, 247, 247, 0.5);
  --crepe-color-surface-low: rgba(237, 237, 237, 0.5);
  --crepe-color-on-surface: #1c1c1c;
  --crepe-color-on-surface-variant: #4d4d4d;
  --crepe-color-outline: #a8a8a8;
  --crepe-color-primary: #333333;
  --crepe-color-secondary: #cfcfcf;
  --crepe-color-on-secondary: #000000;
  --crepe-color-inverse: #f0f0f0;
  --crepe-color-on-inverse: #1a1a1a;
  --crepe-color-inline-code: #ba1a1a;
  --crepe-color-error: #ba1a1a;
  --crepe-color-hover: #e0e0e0;
  --crepe-color-selected: #d5d5d5;
  --crepe-color-inline-area: #cacaca;
}

:root[data-theme='dark'] .milkdown {
  --crepe-color-background: transparent;
  --crepe-color-on-background: #e6e6e6;
  --crepe-color-surface: rgba(18, 18, 18, 0.5);
  --crepe-color-surface-low: rgba(28, 28, 28, 0.5);
  --crepe-color-on-surface: #d1d1d1;
  --crepe-color-on-surface-variant: #a9a9a9;
  --crepe-color-outline: #757575;
  --crepe-color-primary: #b5b5b5;
  --crepe-color-secondary: #4d4d4d;
  --crepe-color-on-secondary: #d6d6d6;
  --crepe-color-inverse: #e5e5e5;
  --crepe-color-on-inverse: #2a2a2a;
  --crepe-color-inline-code: #ff6666;
  --crepe-color-error: #ff6666;
  --crepe-color-hover: #232323;
  --crepe-color-selected: #2f2f2f;
  --crepe-color-inline-area: #2b2b2b;
}

html,
body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow-x: hidden;
  overflow-y: auto;
  background: var(--app-bg);
  color: var(--app-text);
}

body {
  min-width: 320px;
}

#app {
  width: 100vw;
  height: 100vh;
  margin: 0;
  padding: 0;
  max-width: none;
  background: var(--app-bg);
  color: var(--app-text);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  transition:
    background-color 220ms ease,
    color 220ms ease,
    border-color 220ms ease,
    box-shadow 220ms ease;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition: none !important;
  }
}

/* ── Mermaid diagram blocks ─────────────────────────────────────────── */
.mermaid-block {
  display: block;
  width: fit-content;
  max-width: 100%;
  margin: 1em auto;
  padding: 12px;
  background: var(--crepe-color-surface, #f7f7f7);
  border: 1px solid var(--panel-border, #d7deea);
  border-radius: 10px;
  transition: border-color 160ms ease, box-shadow 160ms ease, background-color 160ms ease;
}

.mermaid-block:hover {
  border-color: var(--focus-ring, #3b82f6);
}

.mermaid-controls {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-bottom: 10px;
  flex-wrap: wrap;
}

.mermaid-action-btn {
  appearance: none;
  border: 1px solid var(--mermaid-action-border);
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.01em;
  line-height: 1.2;
  background: var(--mermaid-action-bg);
  color: var(--mermaid-action-fg);
  cursor: pointer;
  box-shadow: var(--mermaid-action-shadow);
  transition: border-color 160ms ease, box-shadow 160ms ease, transform 160ms ease, background 160ms ease;
}

.mermaid-action-btn:hover:not([disabled]) {
  border-color: var(--focus-ring);
  background: var(--mermaid-action-hover-bg);
  box-shadow: var(--mermaid-action-shadow-hover);
  transform: translateY(-1px);
}

.mermaid-action-btn:active:not([disabled]) {
  transform: translateY(0);
}

.mermaid-action-btn[disabled] {
  background: var(--mermaid-action-disabled-bg);
  color: var(--mermaid-action-disabled-fg);
  cursor: not-allowed;
}

.mermaid-inner {
  display: block;
  max-width: 100%;
  max-height: var(--mermaid-max-height);
  overflow: auto;
  border-radius: 8px;
  padding: 8px;
  background: rgba(255, 255, 255, 0.88);
}

.mermaid-inner::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

.mermaid-inner::-webkit-scrollbar-thumb {
  background-color: var(--scrollbar-thumb);
  border-radius: 4px;
}

.mermaid-image {
  display: block;
  width: auto;
  height: auto;
  max-width: none;
  margin: 0 auto;
}

.mermaid-inner svg {
  display: block;
}

.mermaid-loading {
  padding: 24px;
  text-align: center;
  font-size: 1.4em;
  color: var(--muted-text, #6b7280);
  letter-spacing: 0.2em;
  animation: mermaid-pulse 1.2s ease-in-out infinite;
}

@keyframes mermaid-pulse {
  0%, 100% { opacity: 0.4; }
  50%       { opacity: 1;   }
}

.mermaid-error {
  padding: 12px 16px;
  margin: 0;
  background: rgba(220, 38, 38, 0.08);
  border: 1px solid var(--danger-text, #dc2626);
  border-radius: 6px;
  color: var(--danger-text, #dc2626);
  font-size: 12px;
  font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Mono', monospace;
  white-space: pre-wrap;
  word-break: break-word;
}

:root[data-theme='dark'] .milkdown .katex {
  color: var(--crepe-color-on-background);
}

:root[data-theme='dark'] .milkdown .cm-editor,
:root[data-theme='dark'] .milkdown .cm-scroller {
  background-color: rgba(237, 237, 237, 0.86);
  color: var(--crepe-color-on-surface);
}

:root[data-theme='dark'] .milkdown .cm-gutters {
  background-color: rgba(237, 237, 237, 0.86);
  color: var(--crepe-color-on-surface-variant);
  border-right-color: var(--panel-border);
}

@media (max-width: 768px) {
  .mermaid-inner {
    max-height: var(--mermaid-mobile-max-height);
  }
}