/* Layout: sticky slim top bar, tool grid of "from → to" paper cards, two-column workspace (files | options) */
:root {
  --paper: #f7f6f4;
  --sheet: #ffffff;
  --ink: #1d1a1c;
  --muted: #6b6466;
  --line: #e4dfdf;
  --stamp: #c8322b;
  --stamp-soft: #fbe9e7;
  --ok: #1f7a4d;
  --err: #b3261e;

  --f-display: "Bricolage Grotesque", "Segoe UI", system-ui, sans-serif;
  --f-body: "Figtree", "Segoe UI", system-ui, -apple-system, sans-serif;
  --f-mono: "JetBrains Mono", ui-monospace, Consolas, monospace;

  --radius: 10px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #161415; --sheet: #211e1f; --ink: #f2eeee; --muted: #a9a0a2;
    --line: #353031; --stamp: #f0625a; --stamp-soft: #3a1f1d; --ok: #5fcf96; --err: #ff8a80;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #161415; --sheet: #211e1f; --ink: #f2eeee; --muted: #a9a0a2;
  --line: #353031; --stamp: #f0625a; --stamp-soft: #3a1f1d; --ok: #5fcf96; --err: #ff8a80;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.55 var(--f-body);
  -webkit-font-smoothing: antialiased;
}
[hidden] { display: none !important; }
a { color: inherit; }
:focus-visible { outline: 2px solid var(--stamp); outline-offset: 2px; }

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}

/* Top bar */
.topbar {
  position: sticky; top: 0; z-index: 5;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.topbar-inner { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding-block: 12px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font: 800 20px var(--f-display); letter-spacing: -0.01em; }
.brand-mark {
  display: grid; place-items: center; width: 30px; height: 36px;
  background: var(--stamp); color: #fff; border-radius: 3px 10px 3px 3px;
  font-size: 18px;
}
.privacy-pill {
  font-size: 13px; color: var(--ok); border: 1px solid currentColor;
  padding: 3px 10px; border-radius: 99px; white-space: nowrap;
}

/* Hero */
.hero { padding-block: 56px 32px; max-width: 720px; }
.hero h1 {
  font: 800 clamp(32px, 5.5vw, 54px)/1.05 var(--f-display);
  letter-spacing: -0.025em; margin: 0 0 16px; text-wrap: balance;
}
.hero h1 em { font-style: normal; color: var(--stamp); }
.lede { color: var(--muted); font-size: 18px; margin: 0; max-width: 60ch; }

/* Tool grid */
.tool-grid {
  display: grid; gap: 14px;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  padding-bottom: 56px;
}
.tool-card {
  display: flex; flex-direction: column; gap: 10px;
  text-align: left; font: inherit; color: inherit; text-decoration: none;
  background: var(--sheet); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px; cursor: pointer;
  transition: transform .15s ease, border-color .15s ease, box-shadow .15s ease;
}
.tool-card:hover { transform: translateY(-2px); border-color: var(--stamp); box-shadow: 0 6px 18px -10px color-mix(in srgb, var(--stamp) 60%, transparent); }
.tool-card h3 { margin: 0; font: 600 19px/1.2 var(--f-display); }
.tool-card p { margin: 0; color: var(--muted); font-size: 14px; }

/* "from → to" format chips that look like little file sheets */
.formats { display: flex; align-items: center; gap: 6px; }
.sheet-chip {
  position: relative;
  font: 500 11px var(--f-mono); letter-spacing: .04em;
  padding: 10px 7px 4px; min-width: 38px; text-align: center;
  border: 1.5px solid var(--ink); border-radius: 2px 8px 2px 2px;
  background: var(--sheet);
}
.sheet-chip.pdf { border-color: var(--stamp); color: var(--stamp); background: var(--stamp-soft); }
.arrow { color: var(--muted); font-size: 14px; }

/* Workspace */
.back { display: inline-block; margin-top: 28px; color: var(--muted); text-decoration: none; font-weight: 500; }
.back:hover { color: var(--stamp); }
.tool-head { padding-block: 18px 24px; }
.tool-head h2 { font: 800 clamp(28px, 4vw, 40px)/1.1 var(--f-display); letter-spacing: -0.02em; margin: 12px 0 6px; }
.tool-desc { margin: 0; color: var(--muted); max-width: 62ch; }

.work-grid { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 20px; padding-bottom: 56px; align-items: start; }
@media (max-width: 820px) { .work-grid { grid-template-columns: minmax(0, 1fr); } }
.work-main { min-width: 0; display: flex; flex-direction: column; gap: 14px; }

.dropzone {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 6px;
  min-height: 180px; padding: 24px; text-align: center; cursor: pointer;
  border: 2px dashed var(--line); border-radius: var(--radius); background: var(--sheet);
  transition: border-color .15s, background .15s;
}
.dropzone:hover, .dropzone.drag { border-color: var(--stamp); background: var(--stamp-soft); }
.dz-title { font: 600 20px var(--f-display); }
.dz-title u { color: var(--stamp); text-underline-offset: 3px; }
.dz-hint { color: var(--muted); font-size: 14px; }

.field-label { display: block; font-weight: 600; font-size: 14px; margin-bottom: 6px; }
textarea, input[type="text"], input[type="number"], select {
  width: 100%; font: inherit; font-size: 15px; color: var(--ink);
  background: var(--sheet); border: 1px solid var(--line); border-radius: 8px; padding: 9px 11px;
}
textarea { resize: vertical; line-height: 1.5; }
input[type="color"] { width: 48px; height: 38px; padding: 2px; border: 1px solid var(--line); border-radius: 8px; background: var(--sheet); }
input[type="range"] { width: 100%; accent-color: var(--stamp); }

.file-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.file-item {
  display: grid; grid-template-columns: 48px minmax(0, 1fr) auto; align-items: center; gap: 12px;
  background: var(--sheet); border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px;
}
.thumb {
  width: 48px; height: 60px; border-radius: 3px; object-fit: cover;
  background: var(--paper); border: 1px solid var(--line);
  display: grid; place-items: center; font: 500 10px var(--f-mono); color: var(--stamp);
}
.file-info { min-width: 0; }
.file-name { font-weight: 600; font-size: 14px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file-meta { font: 500 12px var(--f-mono); color: var(--muted); font-variant-numeric: tabular-nums; }
.file-actions { display: flex; gap: 4px; }
.icon-btn {
  width: 32px; height: 32px; border-radius: 6px; border: 1px solid var(--line);
  background: transparent; color: var(--ink); cursor: pointer; font-size: 14px;
}
.icon-btn:hover:not(:disabled) { border-color: var(--stamp); color: var(--stamp); }
.icon-btn:disabled { opacity: .35; cursor: default; }

/* Options panel */
.options, .result {
  background: var(--sheet); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px;
}
#optionsBody { display: flex; flex-direction: column; gap: 14px; margin-bottom: 16px; }
#optionsBody:empty { display: none; }
.opt-row { display: flex; gap: 10px; align-items: end; }
.opt-row > * { flex: 1; min-width: 0; }
.hint { font-size: 13px; color: var(--muted); margin: 4px 0 0; }
.seg { display: flex; flex-wrap: wrap; gap: 6px; }
.seg label {
  flex: 1; text-align: center; cursor: pointer; font-size: 14px; white-space: nowrap;
  border: 1px solid var(--line); border-radius: 7px; padding: 7px 8px;
}
.seg input { position: absolute; opacity: 0; pointer-events: none; }
.seg input:checked + span { color: var(--stamp); font-weight: 600; }
.seg label:has(input:checked) { border-color: var(--stamp); background: var(--stamp-soft); }
.seg label:has(input:focus-visible) { outline: 2px solid var(--stamp); outline-offset: 2px; }

.btn-primary, .btn-download {
  display: block; width: 100%; text-align: center; text-decoration: none;
  font: 600 16px var(--f-body); padding: 12px; border-radius: 8px; border: 0; cursor: pointer;
  background: var(--stamp); color: #fff;
}
.btn-primary:hover, .btn-download:hover { filter: brightness(1.08); }
.btn-primary:disabled { opacity: .5; cursor: progress; }
.status { margin: 10px 0 0; font-size: 14px; color: var(--muted); min-height: 1.4em; }
.status.error { color: var(--err); }

.result { margin-top: 14px; border-color: var(--ok); }
.result-label { margin: 0; font: 500 11px var(--f-mono); text-transform: uppercase; letter-spacing: .1em; color: var(--ok); }
.result-name { margin: 4px 0 0; font-weight: 600; word-break: break-all; }
.result-meta { margin: 2px 0 14px; font: 500 13px var(--f-mono); color: var(--muted); }
.btn-download { background: var(--ok); }

.footer { padding-block: 24px 40px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
.footer p { margin: 0; }

@media (max-width: 480px) {
  .privacy-pill { display: none; }
  .hero { padding-block: 36px 24px; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}