@font-face {
  font-family: "Instrument Serif";
  src: url("/fonts/instrument-serif-latin-400-normal.DnYpCC2O.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "IBM Plex Sans";
  src: url("/fonts/ibm-plex-sans-latin-400-normal.CDDApCn2.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

:root {
  --bg: #14110f;
  --raised: #1b1714;
  --sunken: #0e0b09;
  --ink: #f5ede4;
  --ink-soft: #e0d4c5;
  --ink-muted: #a8998a;
  --ink-dim: #6e625a;
  --line: #f5ede41a;
  --line-strong: #f5ede42e;
  --accent: #c9774d;
  --accent-dark: #9e5734;
  --ok: #7fad7b;
  --danger: #d46a5f;
  --font-sans: "IBM Plex Sans", "HarmonyOS Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", ui-sans-serif, system-ui, sans-serif;
  --font-serif: "Instrument Serif", "Source Han Serif SC", "Noto Serif SC", "Songti SC", STSong, ui-serif, Georgia, serif;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
}

body {
  min-height: 100vh;
  margin: 0;
  background:
    linear-gradient(90deg, rgba(245, 237, 228, 0.035) 1px, transparent 1px) 0 0 / 72px 72px,
    linear-gradient(rgba(245, 237, 228, 0.03) 1px, transparent 1px) 0 0 / 72px 72px,
    var(--bg);
  color: var(--ink);
}

button,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

[hidden] {
  display: none !important;
}

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

.site-header,
.site-footer,
.page-shell {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  border-bottom: 1px solid var(--line);
}

.wordmark {
  display: inline-flex;
  align-items: baseline;
  font-family: var(--font-serif);
  font-size: 1.75rem;
  line-height: 1;
}

.accent {
  color: var(--accent);
}

.language-toggle {
  display: inline-grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  overflow: hidden;
  background: rgba(14, 11, 9, 0.72);
}

.lang-button {
  min-width: 48px;
  min-height: 34px;
  border: 0;
  color: var(--ink-muted);
  background: transparent;
}

.lang-button.active {
  color: var(--ink);
  background: var(--accent-dark);
}

.page-shell {
  padding: 54px 0 34px;
}

.intro {
  display: grid;
  gap: 16px;
  max-width: 860px;
}

.eyebrow {
  margin: 0;
  color: var(--ink-muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.72rem;
  line-height: 1.3;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(3.1rem, 6vw, 5.9rem);
  font-weight: 400;
  line-height: 0.98;
  letter-spacing: 0;
}

.subtitle {
  max-width: 760px;
  margin: 0;
  color: var(--ink-soft);
  font-size: 1.05rem;
  line-height: 1.75;
}

.tool-grid {
  display: grid;
  grid-template-columns: minmax(290px, 0.8fr) minmax(340px, 1fr) minmax(360px, 1.1fr);
  gap: 18px;
  margin-top: 38px;
  align-items: stretch;
}

.upload-panel,
.preview-panel,
.markdown-panel {
  min-width: 0;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: rgba(27, 23, 20, 0.86);
}

.upload-panel {
  display: grid;
  align-content: start;
  gap: 18px;
  padding: 18px;
}

.mode-toggle {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.mode-button {
  display: grid;
  gap: 4px;
  min-height: 68px;
  padding: 10px 12px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: var(--sunken);
  color: var(--ink-muted);
  text-align: left;
}

.mode-button span {
  color: var(--ink-soft);
  font-size: 0.98rem;
  line-height: 1.25;
}

.mode-button small {
  color: var(--ink-dim);
  font-size: 0.78rem;
  line-height: 1.4;
}

.mode-button.active {
  border-color: var(--accent);
  background: #20150f;
}

.mode-button.active span,
.mode-button.active small {
  color: var(--ink);
}

.drop-zone {
  display: grid;
  gap: 12px;
  place-items: center;
  min-height: 236px;
  width: 100%;
  border: 1px dashed var(--line-strong);
  border-radius: 8px;
  background: var(--sunken);
  color: var(--ink);
  text-align: center;
  transition: border-color 150ms ease, background-color 150ms ease, transform 150ms ease;
}

.drop-zone:hover,
.drop-zone.dragging {
  border-color: var(--accent);
  background: #17110d;
}

.drop-icon {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--accent);
  border-radius: 50%;
  color: var(--accent);
  font-size: 1.5rem;
}

.drop-title {
  color: var(--ink);
  font-size: 1.04rem;
}

.drop-note,
.file-size,
.message,
.processing-copy,
.empty {
  color: var(--ink-muted);
  font-size: 0.9rem;
  line-height: 1.55;
}

.file-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.file-name,
.file-size {
  margin: 0;
  overflow-wrap: anywhere;
}

.file-name {
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.ghost-button,
.icon-button {
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  color: var(--ink);
  background: transparent;
}

.ghost-button {
  min-height: 36px;
  padding: 0 12px;
}

.progress-wrap {
  display: grid;
  gap: 10px;
}

.progress-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.progress-track {
  height: 8px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--sunken);
}

.progress-bar {
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: var(--accent);
  transition: width 160ms ease;
}

.progress-bar.processing {
  width: 100%;
  animation: pulse 1.3s ease-in-out infinite;
}

.processing-copy {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
}

.spinner {
  width: 15px;
  height: 15px;
  border: 2px solid var(--line-strong);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 800ms linear infinite;
  flex: 0 0 auto;
}

.message {
  min-height: 1.4em;
  margin: 0;
}

.message.error {
  color: var(--danger);
}

.message.success {
  color: var(--ok);
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 54px;
  padding: 0 16px;
  border-bottom: 1px solid var(--line);
}

.panel-head p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.preview-frame {
  position: relative;
  min-height: 540px;
  background: var(--sunken);
}

#pdfPreview {
  display: none;
  width: 100%;
  height: 540px;
  border: 0;
}

#pdfPreview.ready {
  display: block;
}

.empty {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  margin: 0;
  padding: 24px;
  text-align: center;
}

.empty.hidden {
  display: none;
}

.result-head {
  align-items: center;
}

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

.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  min-height: 34px;
  padding: 0 10px;
  white-space: nowrap;
  font-size: 0.86rem;
}

.icon-button:not(:disabled):hover,
.ghost-button:hover {
  border-color: var(--accent);
  color: var(--accent);
}

#markdownOutput {
  display: block;
  width: 100%;
  min-height: 540px;
  padding: 16px;
  border: 0;
  resize: vertical;
  color: var(--ink);
  background: var(--sunken);
  outline: none;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9rem;
  line-height: 1.65;
}

#markdownOutput::placeholder {
  color: var(--ink-dim);
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 18px;
  min-height: 78px;
  border-top: 1px solid var(--line);
  color: var(--ink-dim);
  font-size: 0.82rem;
}

.site-footer p {
  margin: 0;
}

.site-footer a:hover {
  color: var(--accent);
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes pulse {
  0%,
  100% {
    opacity: 0.48;
  }
  50% {
    opacity: 1;
  }
}

@media (max-width: 1060px) {
  .tool-grid {
    grid-template-columns: 1fr 1fr;
  }

  .upload-panel {
    grid-column: 1 / -1;
  }
}

@media (max-width: 768px) {
  .site-header,
  .site-footer,
  .page-shell {
    width: min(100% - 28px, 1180px);
  }

  .page-shell {
    padding-top: 34px;
  }

  h1 {
    font-size: 3rem;
  }

  .tool-grid {
    grid-template-columns: 1fr;
    margin-top: 28px;
  }

  .preview-frame,
  #pdfPreview,
  #markdownOutput {
    min-height: 420px;
    height: 420px;
  }

  .panel-head,
  .file-row {
    align-items: flex-start;
    flex-direction: column;
  }

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

  .icon-button {
    flex: 1 1 136px;
  }
}