/* ==========================================================================
   Enhancements Stylesheet
   Palette: #fff, #f2f2f2, #f8f8f8, #292929, #686868, #dedede
   ========================================================================== */

:root {
  --color-bg-base: #fff;
  --color-bg-subtle: #f8f8f8;
  --color-bg-muted: #f2f2f2;
  --color-border: #dedede;
  --color-text-main: #292929;
  --color-text-muted: #686868;
}

/* Base font inheritance */
button, input, select, textarea, dialog {
  font-family: inherit;
  color: var(--color-text-main);
}

/* --------------------------------------------------------------------------
   1. Markdown Body & Content Formatting
   -------------------------------------------------------------------------- */
.markdown-body {
  min-width: 0;
  max-width: 100%;
  font-family: inherit;
  font-size: 17px;
  line-height: 1.8;
  color: var(--color-text-main);
  white-space: normal;
  overflow-wrap: break-word;
  word-break: break-word;
}

.markdown-body a {
  color: var(--color-text-main);
  text-decoration: underline;
  text-underline-offset: 3px;
  overflow-wrap: anywhere;
  word-break: break-all;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  color: var(--color-text-main);
  font-weight: 600;
  line-height: 1.35;
  margin-top: 1.5em;
  margin-bottom: 0.6em;
}

.markdown-body h1 {
  font-size: 1.8em;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.3em;
}

.markdown-body h2 {
  font-size: 1.5em;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.25em;
}

.markdown-body h3 { font-size: 1.3em; }
.markdown-body h4 { font-size: 1.15em; }
.markdown-body h5 { font-size: 1.05em; }
.markdown-body h6 { font-size: 0.95em; color: var(--color-text-muted); }

.markdown-body p {
  margin-top: 0;
  margin-bottom: 1em;
}

.markdown-body ul,
.markdown-body ol {
  margin-top: 0;
  margin-bottom: 1em;
  padding-left: 1.6em;
}

.markdown-body li + li {
  margin-top: 0.35em;
}

.markdown-body blockquote {
  margin: 1.2em 0;
  padding: 0.6em 1.1em;
  color: var(--color-text-muted);
  background-color: var(--color-bg-subtle);
  border-left: 4px solid var(--color-border);
  border-radius: 0 4px 4px 0;
}

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

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

.markdown-body hr {
  height: 1px;
  background-color: var(--color-border);
  border: 0;
  margin: 1.8em 0;
}

.markdown-body code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background-color: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 0.15em 0.4em;
  color: var(--color-text-main);
  overflow-wrap: break-word;
}

.markdown-body pre {
  margin: 1.2em 0;
  padding: 1em 1.2em;
  background-color: var(--color-bg-muted);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  overflow-x: auto;
  line-height: 1.5;
  tab-size: 2;
}

.markdown-body pre code {
  font-size: 0.88em;
  background: transparent;
  border: none;
  padding: 0;
  white-space: pre;
  word-break: normal;
  overflow-wrap: normal;
}

.markdown-table-wrap {
  width: 100%;
  overflow-x: auto;
  margin: 1.2em 0;
  border: 1px solid var(--color-border);
  border-radius: 6px;
}

.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95em;
  background-color: var(--color-bg-base);
  margin: 0;
}

.markdown-body th,
.markdown-body td {
  padding: 0.65em 0.9em;
  border: 1px solid var(--color-border);
  text-align: left;
}

.markdown-body th {
  background-color: var(--color-bg-muted);
  font-weight: 600;
  color: var(--color-text-main);
}

.markdown-body tr:nth-child(even) {
  background-color: var(--color-bg-subtle);
}

/* --------------------------------------------------------------------------
   2. Reasoning Panel (details.reasoning-panel)
   -------------------------------------------------------------------------- */
details.reasoning-panel {
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background-color: var(--color-bg-subtle);
  margin: 1em 0;
  overflow: hidden;
  transition: border-color 0.15s ease;
}

.markdown-body > :first-child { margin-top: 0; }
.markdown-body > :last-child { margin-bottom: 0; }
.reasoning-content > ol { padding-left: 1.4em; }
.reasoning-content li + li { margin-top: 0.6em; }
.reasoning-panel:first-child { margin-top: 0; }

details.reasoning-panel > summary {
  padding: 0.75em 1em;
  font-weight: 500;
  color: var(--color-text-main);
  cursor: pointer;
  background-color: var(--color-bg-subtle);
  user-select: none;
  list-style-position: inside;
  outline: none;
}

details.reasoning-panel > summary:hover {
  background-color: var(--color-bg-muted);
}

details.reasoning-panel > summary:focus-visible {
  outline: 2px solid var(--color-text-main);
  outline-offset: -2px;
}

details.reasoning-panel[open] > summary {
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-bg-muted);
}

.reasoning-content {
  padding: 0.9em 1em;
  font-size: 0.95em;
  line-height: 1.6;
  color: var(--color-text-main);
  background-color: var(--color-bg-base);
}

.reasoning-note {
  margin-top: 0.6em;
  padding-top: 0.6em;
  border-top: 1px dashed var(--color-border);
  font-size: 0.85em;
  color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   3. Settings Dialog (dialog.settings-dialog)
   -------------------------------------------------------------------------- */
/* Do NOT set display on closed dialog to preserve browser default hidden state */
dialog.settings-dialog {
  box-sizing: border-box;
  width: calc(100vw - 32px);
  max-width: 680px;
  max-height: min(90dvh, 920px);
  overflow-y: auto;
  border: 1px solid var(--color-border);
  border-radius: 20px;
  padding: 0;
  margin: auto;
  background-color: var(--color-bg-base);
  color: var(--color-text-main);
  box-shadow: 0 10px 25px rgba(41, 41, 41, 0.12);
}

dialog.settings-dialog::backdrop {
  background-color: rgba(41, 41, 41, 0.4);
  backdrop-filter: blur(2px);
}

dialog.settings-dialog[open] {
  display: flex;
  flex-direction: column;
}

.settings-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1em 1.4em;
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-bg-subtle);
  position: sticky;
  top: 0;
  z-index: 2;
}

.settings-header h2,
.settings-header h3 {
  margin: 0;
  font-size: 1.25em;
  font-weight: 600;
  color: var(--color-text-main);
}

.settings-close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  min-width: 58px;
  min-height: 44px;
  font-size: 1.1em;
  line-height: 1;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 0;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.settings-close:hover {
  background-color: var(--color-bg-muted);
  color: var(--color-text-main);
}

.settings-form {
  padding: 1.4em;
  flex: 1 1 auto;
}

.settings-form fieldset {
  border: none;
  margin: 0;
  padding: 0;
}

.settings-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.1em 1.2em;
}

@media (max-width: 640px) {
  .settings-grid {
    grid-template-columns: 1fr;
    gap: 1em;
  }

  dialog.settings-dialog {
    max-height: 94vh;
  }
}

.settings-help {
  font-size: 0.85em;
  color: var(--color-text-muted);
  margin-top: 0.4em;
  line-height: 1.4;
}

.settings-dialog > .settings-help { margin: 18px 24px 0; }
.settings-status:empty { display: none; }
.settings-header { flex-shrink: 0; }
.settings-form { min-width: 0; }
.settings-grid > *, .settings-form fieldset { min-width: 0; }
.settings-status.form-error { color: var(--color-error); background: var(--color-error-bg); border-color: var(--color-error-border); }

.settings-status {
  padding: 0.75em 1em;
  margin-top: 1em;
  border-radius: 4px;
  border: 1px solid var(--color-border);
  background-color: var(--color-bg-subtle);
  font-size: 0.9em;
  color: var(--color-text-muted);
}

.settings-actions {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 0.75em;
  margin-top: 1.5em;
  padding-top: 1em;
  border-top: 1px solid var(--color-border);
}

/* --------------------------------------------------------------------------
   Accessibility & States: Focus-Visible, Disabled, Reduced-Motion
   -------------------------------------------------------------------------- */
.settings-form input,
.settings-form select,
.settings-form textarea,
.settings-actions button,
.settings-close {
  font-family: inherit;
}

:focus-visible {
  outline: 2px solid var(--color-text-main);
  outline-offset: 2px;
}

input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  border-color: var(--color-text-main);
}

button:disabled,
input:disabled,
select:disabled,
textarea:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  background-color: var(--color-bg-muted);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}