/* ===== Design tokens (dark theme) ===== */
:root {
  --bg: #0f1420;
  --surface: #1a2130;
  --surface-2: #222b3d;
  --ink: #e6e9f2;
  --muted: #97a0b5;
  --brand: #7c85ff;
  --brand-dark: #6670ff;
  --border: #2c3444;
  --shadow: 0 1px 3px rgba(0, 0, 0, .35), 0 12px 32px rgba(0, 0, 0, .35);
  --radius: 14px;

  /* Light "paper" surface for the document preview */
  --paper: #ffffff;
  --paper-ink: #1c2333;
  --paper-border: #e4e7ef;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.55;
}

h1, h2, h3 { line-height: 1.2; }

/* ===== Ad slots (placeholders) ===== */
.ad-slot {
  display: flex;
  align-items: center;
  justify-content: center;
  background: repeating-linear-gradient(45deg, #1d2534, #1d2534 10px, #232c3d 10px, #232c3d 20px);
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: .8rem;
  letter-spacing: .03em;
  border-radius: 10px;
}
.ad-banner { height: 90px; margin: 12px auto; max-width: 970px; }
.ad-box { height: 250px; margin-bottom: 16px; }

/* ===== Header ===== */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 24px;
  max-width: 1200px;
  margin: 0 auto;
}
.brand { display: flex; align-items: center; gap: 14px; }
.logo { font-size: 2rem; }
.site-header h1 { margin: 0; font-size: 1.5rem; }
.tagline { margin: 2px 0 0; color: var(--muted); font-size: .9rem; }

/* ===== Layout ===== */
.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr) 260px;
  gap: 20px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 8px 24px 40px;
  align-items: start;
}
.workspace { display: flex; flex-direction: column; gap: 20px; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
}
.card h2 { margin: 0 0 14px; font-size: 1.1rem; display: flex; align-items: center; gap: 10px; }
.step {
  display: inline-grid;
  place-items: center;
  width: 26px; height: 26px;
  background: var(--brand);
  color: #fff;
  border-radius: 50%;
  font-size: .85rem;
  font-weight: 700;
}

/* ===== Dropzone ===== */
.dropzone {
  border: 2px dashed var(--border);
  border-radius: 12px;
  padding: 22px;
  text-align: center;
  transition: border-color .15s, background .15s;
}
.dropzone.dragover { border-color: var(--brand); background: rgba(124, 133, 255, .1); }
.dropzone p { margin: 4px 0; }
.file-btn {
  display: inline-block;
  background: var(--brand);
  color: #fff;
  padding: 9px 18px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  margin: 6px 0;
}
.file-btn:hover { background: var(--brand-dark); }

.md-input {
  width: 100%;
  min-height: 180px;
  margin-top: 14px;
  padding: 12px;
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-size: .85rem;
  color: var(--ink);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  resize: vertical;
}
.md-input::placeholder { color: var(--muted); }
.md-input:focus { outline: 2px solid var(--brand); border-color: transparent; }

.toolbar { display: flex; justify-content: space-between; margin-top: 8px; font-size: .85rem; }

/* ===== Buttons ===== */
.btn {
  border: none;
  border-radius: 10px;
  padding: 12px 18px;
  font-size: .95rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform .05s, background .15s, opacity .15s;
}
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--brand-dark); }
.btn-ghost { background: var(--surface-2); color: var(--ink); border: 1px solid var(--border); }
.btn-ghost:hover:not(:disabled) { background: #2b3549; }
.link-btn {
  background: none; border: none; color: var(--brand);
  cursor: pointer; font-size: .85rem; text-decoration: underline; padding: 0;
}

.export-row { display: flex; flex-wrap: wrap; gap: 10px; }
.fname-row { display: flex; align-items: center; gap: 10px; margin-top: 14px; font-size: .9rem; }
.fname-row input {
  flex: 1; padding: 8px 10px; border: 1px solid var(--border); border-radius: 8px;
  background: var(--surface-2); color: var(--ink);
}
.status { margin: 12px 0 0; font-size: .9rem; min-height: 1.2em; }
.status.ok { color: #4ade80; }
.status.err { color: #f87171; }

/* ===== Preview ===== */
.preview-card { position: sticky; top: 16px; }
.preview {
  border: 1px solid var(--paper-border);
  border-radius: 10px;
  padding: 28px 32px;
  min-height: 420px;
  max-height: 70vh;
  overflow: auto;
  background: var(--paper);
  color: var(--paper-ink);
}
/* Keep the document preview readable on its light "paper" regardless of the dark UI */
.preview.markdown-body h1 { border-bottom-color: var(--paper-border); }
.preview.markdown-body h2 { border-bottom-color: var(--paper-border); }
.preview.markdown-body a { color: var(--brand-dark); }
.preview .muted { color: #6b7488; }

/* ===== Sidebar / footer ===== */
.sidebar { display: flex; flex-direction: column; }
.recommend h3 { margin: 0 0 10px; font-size: 1rem; }
.recommend ul { padding-left: 0; list-style: none; margin: 0 0 10px; }
.recommend li { margin: 8px 0; }
.recommend a { color: var(--brand); text-decoration: none; font-weight: 500; }
.recommend a:hover { text-decoration: underline; }

.site-footer { text-align: center; padding: 24px; color: var(--muted); font-size: .9rem; }
.footer-nav { margin: 0 0 10px; display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; }
.footer-nav a { color: var(--brand); text-decoration: none; }
.footer-nav a:hover { text-decoration: underline; }
.footer-nav .sep { color: var(--border); }

/* Brand as a link (used on sub-pages to return home) */
.brand-link { text-decoration: none; color: inherit; }

.muted { color: var(--muted); }
.tiny { font-size: .75rem; }

/* ===== Content pages (About / Privacy / Contact) ===== */
.page { max-width: 780px; margin: 0 auto; padding: 8px 24px 48px; }
.page .card { padding: 28px 30px; }
.page h1.page-title { margin: 0 0 6px; font-size: 1.6rem; }
.page h2 { margin: 1.6em 0 .5em; font-size: 1.15rem; }
.page p, .page li { color: var(--ink); line-height: 1.65; }
.page ul { padding-left: 20px; }
.page li { margin: 6px 0; }
.page a { color: var(--brand); }
.page .lead { color: var(--muted); font-size: 1.05rem; }
.page .updated { color: var(--muted); font-size: .85rem; }
.contact-email {
  display: inline-block; margin: 6px 0 2px; padding: 12px 18px;
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 10px; font-size: 1.05rem; text-decoration: none; color: var(--brand);
}
.contact-email:hover { background: #2b3549; }

@media (max-width: 600px) {
  .page { padding: 8px 14px 32px; }
  .page .card { padding: 18px; }
}

/* ===== Markdown body styling (preview + exports) ===== */
.markdown-body h1, .markdown-body h2, .markdown-body h3 { margin-top: 1.4em; }
.markdown-body h1 { border-bottom: 2px solid var(--border); padding-bottom: .3em; }
.markdown-body h2 { border-bottom: 1px solid var(--border); padding-bottom: .3em; }
.markdown-body code {
  background: #f0f2f8; padding: 2px 6px; border-radius: 5px;
  font-family: ui-monospace, Consolas, monospace; font-size: .9em;
}
.markdown-body pre {
  background: #1e2430; color: #e6e9f0; padding: 14px 16px;
  border-radius: 10px; overflow-x: auto;
}
.markdown-body pre code { background: none; color: inherit; padding: 0; }
.markdown-body blockquote {
  margin: 1em 0; padding: .4em 1em; border-left: 4px solid var(--brand);
  color: var(--muted); background: #f7f8fc;
}
.markdown-body table { border-collapse: collapse; width: 100%; margin: 1em 0; }
.markdown-body th, .markdown-body td { border: 1px solid var(--border); padding: 8px 12px; }
.markdown-body th { background: #f4f6fb; }
.markdown-body img { max-width: 100%; }
.markdown-body a { color: var(--brand); }

/* ===== Privacy note ===== */
.privacy-note {
  max-width: 1200px;
  margin: 0 auto 8px;
  padding: 12px 20px;
  background: rgba(74, 222, 128, .08);
  border: 1px solid rgba(74, 222, 128, .25);
  border-radius: 12px;
  color: #b8f0cd;
  font-size: .9rem;
}
.privacy-note strong { color: #4ade80; }

/* ===== Metadata remover ===== */
.tool-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 40px;
}
.meta-card h2 { font-size: 1.15rem; }
.meta-intro { margin-top: -4px; max-width: 720px; }
.meta-report {
  margin: 16px 0;
  padding: 14px 16px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 10px;
}
.meta-found { margin: 0 0 10px; font-weight: 600; color: #ffd369; }
.meta-clean { margin: 0; font-weight: 600; color: #4ade80; }
.meta-list { list-style: none; margin: 0 0 8px; padding: 0; }
.meta-list li {
  display: flex; justify-content: space-between; gap: 12px;
  padding: 7px 0; border-bottom: 1px solid var(--border); font-size: .9rem;
}
.meta-list li:last-child { border-bottom: none; }

/* ===== Responsive ===== */

/* Tablet: collapse the 3-column grid to a single column */
@media (max-width: 980px) {
  .layout { grid-template-columns: 1fr; }
  .preview-card { position: static; }
  .preview { max-height: none; }
  .sidebar { flex-direction: row; flex-wrap: wrap; }
  .sidebar > * { flex: 1 1 260px; }
}

/* Phone */
@media (max-width: 600px) {
  .site-header {
    flex-wrap: wrap;
    padding: 14px 16px;
    gap: 12px;
  }
  .site-header h1 { font-size: 1.25rem; }
  .logo { font-size: 1.6rem; }
  .tagline { font-size: .82rem; }

  .privacy-note {
    margin: 0 12px 8px;
    padding: 10px 14px;
    font-size: .82rem;
  }

  .layout { padding: 8px 14px 28px; gap: 14px; }
  .tool-section { padding: 0 14px 28px; }
  .card { padding: 16px; }

  .dropzone { padding: 16px; }
  .md-input { min-height: 150px; }

  /* Stack export buttons full-width for easy tapping */
  .export-row { flex-direction: column; }
  .export-row .btn { width: 100%; }

  .fname-row { flex-wrap: wrap; }

  .preview { padding: 18px 16px; }
  /* Let wide tables/code scroll instead of breaking the layout */
  .markdown-body pre,
  .markdown-body table { max-width: 100%; }

  .sidebar { flex-direction: column; }
  .ad-banner { height: 70px; }
}

/* Very small phones */
@media (max-width: 380px) {
  .site-header h1 { font-size: 1.1rem; }
  .step { width: 22px; height: 22px; font-size: .75rem; }
  .card h2 { font-size: 1rem; }
}