:root {
  color-scheme: light;
  --app-bg: #f8fafd;
  --surface: #ffffff;
  --surface-muted: #f8f9fa;
  --surface-container: #eef3fd;
  --surface-container-high: #e8f0fe;
  --line: #c4c7c5;
  --line-strong: #80868b;
  --text: #1b1b1f;
  --muted: #5f6368;
  --accent: #0b57d0;
  --accent-strong: #0842a0;
  --accent-soft: #e8f0fe;
  --danger: #b3261e;
  --shadow: 0 1px 2px rgb(60 64 67 / 0.16), 0 1px 3px 1px rgb(60 64 67 / 0.08);
  --shadow-soft: 0 1px 2px rgb(60 64 67 / 0.12);
  font-family:
    Roboto,
    "Noto Sans SC",
    "PingFang SC",
    "Hiragino Sans GB",
    "Microsoft YaHei",
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-width: 320px;
  min-height: 100%;
  margin: 0;
}

body {
  background: var(--app-bg);
  color: var(--text);
}

button,
a,
input,
select,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

a {
  color: inherit;
  text-decoration: none;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.65;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
summary:focus-visible {
  outline: 3px solid rgb(11 87 208 / 0.22);
  outline-offset: 2px;
}

.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app[data-app] {
  height: 100vh;
  overflow: hidden;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 14px 20px;
  border-bottom: 1px solid rgb(196 199 197 / 0.72);
  background: rgb(255 255 255 / 0.96);
  box-shadow: 0 1px 2px rgb(60 64 67 / 0.08);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border-radius: 12px;
  background: #e8f0fe;
  color: var(--accent);
  box-shadow: none;
  font-weight: 800;
  letter-spacing: 0;
}

.brand h1 {
  margin: 0;
  font-size: 20px;
  line-height: 1.1;
  letter-spacing: 0;
  font-weight: 700;
}

.brand p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 12px;
  font-weight: 500;
}

.top-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  flex-wrap: wrap;
}

.language-control {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 38px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--surface);
  color: var(--text);
  font-size: 13px;
}

.language-control select {
  height: 30px;
  min-width: 120px;
  max-width: 150px;
  border: 0;
  padding: 0 4px;
  color: var(--text);
  background: transparent;
}

.language-control:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
}

.button,
.text-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: 20px;
  min-height: 38px;
  padding: 0 15px;
  font-weight: 600;
  transition:
    background 0.15s ease,
    border-color 0.15s ease,
    color 0.15s ease,
    box-shadow 0.15s ease,
    transform 0.15s ease;
}

.button-primary {
  color: #ffffff;
  background: var(--accent);
  box-shadow: none;
}

.button-primary:hover {
  background: var(--accent-strong);
}

.button-tonal {
  color: var(--accent);
  border-color: transparent;
  background: var(--accent-soft);
  box-shadow: none;
}

.button-secondary,
.text-button {
  color: var(--text);
  border-color: var(--line);
  background: var(--surface);
  box-shadow: none;
}

.button-tonal:hover {
  background: #dbe7fd;
}

.button-secondary:hover,
.text-button:hover {
  border-color: var(--accent);
  background: #f6f9fe;
}

.text-button {
  color: var(--danger);
  background: transparent;
  border-color: rgb(179 38 30 / 0.18);
}

.workspace {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(320px, 0.92fr) minmax(420px, 1.35fr);
  grid-template-rows: auto minmax(0, 1fr);
  gap: 16px;
  align-items: stretch;
  min-height: 0;
  padding: 16px;
  overflow: hidden;
}

.settings-panel {
  grid-row: 1;
  grid-column: 1 / -1;
  min-width: 0;
  border: 1px solid rgb(196 199 197 / 0.78);
  border-radius: 24px;
  background: #ffffff;
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}

.panel {
  min-width: 0;
  min-height: 0;
  height: 100%;
  border: 1px solid rgb(196 199 197 / 0.78);
  border-radius: 24px;
  background: var(--surface);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}

.editor-panel {
  grid-row: 2;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 76px;
  padding: 16px 18px;
  border-bottom: 1px solid rgb(196 199 197 / 0.68);
  background: #ffffff;
}

.panel-head h2 {
  margin: 0;
  font-size: 16px;
  letter-spacing: 0;
  font-weight: 700;
}

.panel-head p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 12px;
}

#markdownInput {
  flex: 1;
  width: 100%;
  min-height: 0;
  resize: none;
  border: 0;
  outline: none;
  overflow: auto;
  padding: 24px 26px;
  color: #141a23;
  background: #ffffff;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 14px;
  line-height: 1.62;
  tab-size: 2;
}

.preview-panel {
  grid-row: 2;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.controls {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 6px 8px;
  align-items: end;
  padding: 3px 8px;
  background: transparent;
}

.primary-controls {
  display: grid;
  grid-template-columns: minmax(320px, 0.9fr) minmax(410px, 1.08fr) minmax(420px, 1.18fr);
  gap: 8px;
  align-items: end;
  min-width: 0;
}

.control-group {
  min-width: 0;
  display: grid;
  gap: 2px 7px;
  align-items: end;
  padding: 3px 6px 4px;
  border-radius: 18px;
  background: transparent;
  box-shadow: none;
}

.page-controls {
  grid-template-columns: minmax(82px, 0.7fr) minmax(92px, 0.75fr) minmax(132px, 1fr);
}

.type-controls {
  grid-template-columns: minmax(132px, 0.95fr) minmax(132px, 0.95fr) minmax(120px, 0.8fr);
}

.document-control-grid {
  grid-template-columns: minmax(220px, 1fr) minmax(108px, 0.42fr);
}

.control-group-title {
  grid-column: 1 / -1 !important;
  margin-bottom: -1px;
  color: var(--muted);
  font-size: 10px;
  font-weight: 700;
  line-height: 1.15;
  text-transform: none;
  letter-spacing: 0.01em;
}

.controls label {
  min-width: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 3px 6px;
}

.controls span {
  grid-column: 1;
  color: var(--muted);
  font-size: 10px;
  line-height: 1.2;
  white-space: nowrap;
  font-weight: 500;
}

.controls select,
.controls input[type="text"],
.controls input[type="range"],
.controls input[type="color"] {
  grid-column: 1 / -1;
  width: 100%;
}

.controls select,
.controls input[type="text"] {
  height: 32px;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0 12px;
  color: var(--text);
  background: #ffffff;
  box-shadow: none;
}

.controls input[type="text"] {
  min-width: 0;
}

.controls input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  height: 18px;
  background: transparent;
}

.controls input[type="color"] {
  height: 32px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #ffffff;
}

.controls select:hover,
.controls input[type="text"]:hover,
.controls input[type="color"]:hover {
  border-color: var(--line-strong);
}

.controls select:focus,
.controls input[type="text"]:focus,
.controls input[type="color"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
}

.controls input[type="range"]::-webkit-slider-runnable-track {
  height: 4px;
  border-radius: 999px;
  background: #d3d8df;
}

.controls input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  margin-top: -6px;
  border: 0;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 1px 2px rgb(60 64 67 / 0.3);
}

.controls input[type="range"]::-moz-range-track {
  height: 4px;
  border: 0;
  border-radius: 999px;
  background: #d3d8df;
}

.controls input[type="range"]::-moz-range-progress {
  height: 4px;
  border-radius: 999px;
  background: var(--accent);
}

.controls input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border: 0;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 1px 2px rgb(60 64 67 / 0.3);
}

.controls output {
  grid-column: 2;
  grid-row: 1;
  justify-self: end;
  color: var(--text);
  font-size: 10px;
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.switch-label {
  height: 32px;
  display: flex !important;
  align-items: center;
  justify-content: center;
  gap: 7px !important;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #ffffff;
  box-shadow: none;
}

.switch-label input {
  width: 16px;
  height: 16px;
  margin: 0;
  accent-color: var(--accent);
}

.switch-label span {
  color: var(--text);
}

.advanced-controls {
  min-width: 114px;
  display: grid;
  grid-column: 2;
  grid-row: 1;
  align-self: start;
}

.advanced-controls summary {
  grid-column: 1;
  grid-row: 1;
  position: relative;
  top: 15px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 0 13px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--surface);
  color: var(--text);
  box-shadow: none;
  cursor: pointer;
  list-style: none;
  user-select: none;
  align-self: start;
}

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

.advanced-controls summary::after {
  content: "+";
  color: var(--muted);
  font-weight: 700;
}

.advanced-controls[open] {
  grid-column: 1 / -1;
  display: contents;
}

.advanced-controls[open] summary {
  grid-column: 2;
  grid-row: 1;
  justify-self: end;
  width: auto;
  margin-bottom: 0;
  align-self: start;
}

.advanced-controls[open] summary::after {
  content: "-";
}

.advanced-grid {
  grid-column: 1;
  grid-row: 2;
  display: grid;
  grid-template-columns:
    minmax(160px, 0.9fr)
    minmax(160px, 0.9fr)
    minmax(180px, 1fr)
    minmax(180px, 1fr)
    minmax(160px, 0.9fr)
    minmax(110px, 0.6fr);
  gap: 8px;
  padding-top: 2px;
}

.advanced-switch-field {
  align-self: end;
}

.advanced-switch-field > .switch-label {
  grid-column: 1 / -1;
}

.preview-head {
  background: #ffffff;
}

.preview-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  flex-wrap: wrap;
}

.status-pill {
  flex: 0 0 auto;
  min-height: 32px;
  display: inline-flex;
  align-items: center;
  padding: 0 12px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
}

.preview-tools {
  display: flex;
  align-items: center;
  gap: 4px;
}

.zoom-select {
  width: 104px;
  height: 34px;
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 0 12px;
  color: var(--text);
  background: #ffffff;
  box-shadow: none;
}

.icon-button,
.tool-button {
  height: 34px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: #ffffff;
  color: var(--text);
  box-shadow: none;
}

.icon-button {
  width: 34px;
  padding: 0;
  font-size: 17px;
  line-height: 1;
}

.tool-button {
  padding: 0 12px;
  font-weight: 600;
}

.icon-button:hover,
.tool-button:hover {
  border-color: var(--accent);
  background: #f6f9fe;
}

.preview-scroller {
  flex: 1;
  min-height: 0;
  overflow: auto;
  padding: 26px;
  cursor: grab;
  user-select: none;
  background:
    linear-gradient(rgb(213 220 232 / 0.88) 1px, transparent 1px),
    linear-gradient(90deg, rgb(213 220 232 / 0.88) 1px, transparent 1px);
  background-size: 20px 20px;
}

.preview-scroller.is-dragging {
  cursor: grabbing;
}

.preview-scroller .document-page {
  user-select: none;
}

.page-shell {
  width: max-content;
  min-width: 1px;
  min-height: 1px;
  margin: 0 auto;
  transform: translate(var(--preview-pan-x, 0), var(--preview-pan-y, 0)) scale(var(--preview-scale, 1));
  transform-origin: top center;
}

.page-shell.is-exporting {
  width: auto !important;
  height: auto !important;
  transform: none !important;
}

.page-shell.is-exporting .preview-page-numbers {
  display: none !important;
}

.document-page.is-pdf-numbering .page-number {
  visibility: hidden;
}

.document-page {
  position: relative;
  width: var(--paper-width, 210mm);
  min-height: var(--paper-min-height, 297mm);
  margin: 0;
  padding: var(--page-padding, 18mm);
  background: var(--document-paper-color, #ffffff);
  color: var(--document-text-color, #20242a);
  box-shadow: var(--shadow);
  overflow-wrap: anywhere;
  cursor: grab;
  border-radius: 4px;
}

.preview-scroller.is-dragging .document-page {
  cursor: grabbing;
}

.document-header,
.document-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 26px;
  color: #6b7280;
  font-family: var(--document-font);
  font-size: max(11px, calc(var(--document-font-size) * 0.82));
  line-height: 1.35;
}

.document-header {
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid #d7dce5;
}

.document-footer {
  margin-top: 22px;
  padding-top: 8px;
  border-top: 1px solid #d7dce5;
}

.document-header[hidden],
.document-footer[hidden],
.page-number[hidden] {
  display: none;
}

.page-number {
  flex: 0 0 auto;
}

.preview-page-numbers {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  color: #6b7280;
  font-family: var(--document-font);
  font-size: max(11px, calc(var(--document-font-size) * 0.82));
  line-height: 1;
}

.preview-page-number {
  position: absolute;
  transform: translateY(-50%);
  white-space: nowrap;
}

.markdown-body {
  font-family: var(--document-font);
  font-size: var(--document-font-size);
  line-height: var(--document-line-height);
  color: var(--document-text-color);
}

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

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

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  margin: 1.45em 0 0.55em;
  color: var(--document-text-color);
  line-height: 1.22;
  letter-spacing: 0;
  page-break-after: avoid;
}

.markdown-body h1 {
  margin-top: 0;
  padding-bottom: 0.35em;
  border-bottom: 2px solid var(--document-accent-color);
  font-size: 2em;
}

.markdown-body h2 {
  padding-bottom: 0.25em;
  border-bottom: 1px solid #d8dee7;
  font-size: 1.45em;
}

.markdown-body h3 {
  font-size: 1.18em;
}

.markdown-body p,
.markdown-body ul,
.markdown-body ol,
.markdown-body blockquote,
.markdown-body table,
.markdown-body pre {
  margin: 0.85em 0;
}

.markdown-body a {
  color: var(--document-accent-color);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

.markdown-body blockquote {
  padding: 0.1em 1em;
  color: #4b5563;
  border-left: 4px solid var(--document-accent-color);
  background: #eef3fd;
  border-radius: 0 8px 8px 0;
}

.markdown-body code {
  padding: 0.15em 0.35em;
  border-radius: 6px;
  background: #eef3fd;
  color: #26313d;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: var(--document-code-font-size);
}

.markdown-body pre {
  overflow-x: auto;
  padding: 14px;
  border: 1px solid #d8dee7;
  border-radius: 16px;
  background: #f8f9fa;
  page-break-inside: avoid;
}

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

.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  page-break-inside: avoid;
}

.markdown-body th,
.markdown-body td {
  padding: 8px 10px;
  border: 1px solid #d8dee7;
  vertical-align: top;
}

.markdown-body th {
  background: #eef3fd;
  text-align: left;
}

.markdown-body img {
  display: block;
  max-width: min(100%, var(--document-image-scale, 100%));
  height: auto;
  margin: 1em auto;
}

.markdown-body .pdf-bookmark-placeholder {
  display: none;
}

.markdown-body hr {
  height: 1px;
  margin: 1.7em 0;
  border: 0;
  background: #d8dee7;
}

.markdown-body .task-list-item {
  list-style: none;
}

.markdown-body .task-list-item-checkbox {
  width: 1em;
  height: 1em;
  margin: 0 0.45em 0 -1.25em;
  vertical-align: -0.14em;
  accent-color: var(--document-accent-color);
}

.markdown-body .footnotes {
  margin-top: 2.2em;
  font-size: 0.9em;
}

.markdown-body .footnotes ol {
  padding-left: 1.35em;
}

.markdown-body .page-break {
  break-before: page;
  page-break-before: always;
  height: 0;
  margin: 0;
  border: 0;
}

.load-error {
  color: var(--danger);
  font-weight: 600;
}

.help-layout {
  width: min(1180px, calc(100% - 28px));
  margin: 18px auto 40px;
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
}

.help-nav {
  position: sticky;
  top: 88px;
  display: grid;
  gap: 6px;
  padding: 12px;
  border: 1px solid rgb(196 199 197 / 0.78);
  border-radius: 24px;
  background: #ffffff;
  box-shadow: var(--shadow-soft);
}

.help-nav a {
  padding: 10px 12px;
  border-radius: 16px;
  color: var(--muted);
  font-weight: 500;
}

.help-nav a:hover {
  color: var(--accent);
  background: var(--accent-soft);
}

.help-content {
  min-width: 0;
  padding: 30px 34px 36px;
  border: 1px solid rgb(196 199 197 / 0.78);
  border-radius: 24px;
  background: #ffffff;
  box-shadow: var(--shadow-soft);
}

.help-hero {
  padding-bottom: 18px;
  border-bottom: 1px solid rgb(196 199 197 / 0.68);
}

.help-hero p {
  margin: 0 0 8px;
  color: var(--accent);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 12px;
}

.help-hero h1 {
  margin: 0;
  font-size: 32px;
  line-height: 1.18;
  letter-spacing: 0;
}

.help-content section {
  padding-top: 22px;
}

.help-content h2 {
  margin: 0 0 10px;
  font-size: 22px;
  letter-spacing: 0;
}

.help-content p,
.help-content li {
  color: #334155;
  font-size: 15px;
  line-height: 1.75;
}

.help-contact {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #f8f9fa;
}

.help-contact strong {
  color: var(--text);
  font-weight: 700;
}

.help-contact a {
  color: var(--accent);
  font-weight: 600;
}

.not-found-layout {
  min-height: calc(100vh - 73px);
  display: grid;
  place-items: center;
  padding: 24px;
}

.not-found-card {
  width: min(560px, 100%);
  padding: 32px 28px;
  border: 1px solid rgb(196 199 197 / 0.72);
  border-radius: 28px;
  background: var(--surface);
  box-shadow: var(--shadow-soft);
}

.not-found-code {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.not-found-card h2 {
  margin: 0;
  font-size: 32px;
  line-height: 1.1;
}

.not-found-card p:not(.not-found-code) {
  margin: 14px 0 0;
  color: var(--muted);
  line-height: 1.7;
}

.not-found-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 22px;
}

.help-content pre {
  overflow-x: auto;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #f7f9ff;
}

.help-content code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

@media (max-width: 1360px) {
  .controls {
    grid-template-columns: 1fr auto;
  }

  .primary-controls {
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  }

  .advanced-controls {
    min-width: 0;
  }

  .advanced-grid {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  }
}

@media (max-width: 900px) {
  .app[data-app] {
    height: auto;
    overflow: visible;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .top-actions {
    width: 100%;
    justify-content: flex-start;
  }

  .workspace {
    grid-template-columns: 1fr;
    grid-template-rows: auto;
    overflow: visible;
  }

  .panel {
    min-height: auto;
    height: auto;
  }

  #markdownInput {
    min-height: 420px;
  }

  .settings-panel {
    grid-column: auto;
  }

  .editor-panel,
  .preview-panel {
    grid-row: auto;
  }

  .help-layout {
    grid-template-columns: 1fr;
  }

  .help-nav {
    position: static;
  }
}

@media (max-width: 560px) {
  .workspace {
    padding: 8px;
  }

  .page-controls,
  .type-controls,
  .document-control-grid {
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  }

  .preview-scroller {
    padding: 12px;
  }

  .page-shell {
    transform-origin: top left;
  }

  .help-layout {
    width: calc(100% - 16px);
    margin-top: 8px;
  }

  .help-content {
    padding: 22px 18px 26px;
  }

  .help-hero h1 {
    font-size: 25px;
  }
}

@media print {
  .page-shell {
    width: auto !important;
    height: auto !important;
    transform: none !important;
  }
}