:root {
  --paper: #f2f0ea;
  --paper-raised: #fbfaf7;
  --ink: #15233b;
  --ink-soft: #4a5670;
  --blue: #3a6ea5;
  --blue-dim: #b9cbdd;
  --rust: #c1440e;
  --rust-dark: #9c360a;
  --green: #2f6f4f;
  --line: #c7c2b6;
  --radius: 3px;
}

* { box-sizing: border-box; }

html { scroll-padding-top: 24px; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  position: relative;
}

.grid-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 32px 32px;
  opacity: 0.28;
}

.wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* ---------- header ---------- */
.site-head {
  padding: 28px 0 20px;
  border-bottom: 1px solid var(--line);
  background: var(--paper);
  position: relative;
  z-index: 2;
}
.site-head .wrap { display: flex; align-items: baseline; gap: 10px; }
.mark { color: var(--rust); font-size: 20px; }
.brand-mono {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}

/* ---------- hero ---------- */
.hero { padding: 64px 0 40px; }
.hero h1 {
  font-family: 'Newsreader', serif;
  font-weight: 500;
  font-size: clamp(32px, 5vw, 48px);
  line-height: 1.12;
  margin: 0 0 20px;
  max-width: 14ch;
}
.lede {
  font-size: 18px;
  color: var(--ink-soft);
  max-width: 52ch;
  margin: 0;
}

/* ---------- steps ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  padding: 8px 0 56px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 48px;
}
.step-no {
  display: block;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 13px;
  color: var(--rust);
  margin-bottom: 8px;
}
.step h3 {
  font-family: 'Newsreader', serif;
  font-weight: 500;
  font-size: 19px;
  margin: 0 0 6px;
}
.step p {
  color: var(--ink-soft);
  font-size: 14.5px;
  margin: 0;
}

/* ---------- drafting table / dropzone ---------- */
.drafting-table { padding-bottom: 56px; }

.dropzone {
  position: relative;
  background: var(--paper-raised);
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  min-height: 260px;
  padding: 48px 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  transition: border-color 0.15s ease, background 0.15s ease;
}
.dropzone:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
}
.dropzone.drag-over {
  border-color: var(--blue);
  background: #eef3f8;
}

.corner {
  position: absolute;
  width: 14px;
  height: 14px;
  border: 2px solid var(--ink-soft);
  opacity: 0.55;
}
.corner.tl { top: -1px; left: -1px; border-right: none; border-bottom: none; }
.corner.tr { top: -1px; right: -1px; border-left: none; border-bottom: none; }
.corner.bl { bottom: -1px; left: -1px; border-right: none; border-top: none; }
.corner.br { bottom: -1px; right: -1px; border-left: none; border-top: none; }

.dz-state { width: 100%; }

.dz-title {
  font-family: 'Newsreader', serif;
  font-size: 21px;
  margin: 0 0 6px;
}
.dz-sub {
  color: var(--ink-soft);
  font-size: 14px;
  margin: 0 0 22px;
}

#preview-img {
  max-width: 100%;
  max-height: 320px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 20px;
  background: #fff;
}
.dz-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

.spinner {
  width: 30px;
  height: 30px;
  margin: 0 auto 18px;
  border: 3px solid var(--blue-dim);
  border-top-color: var(--blue);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- buttons ---------- */
.btn {
  font-family: 'Inter', sans-serif;
  font-size: 14.5px;
  font-weight: 500;
  padding: 11px 20px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}
.btn-primary {
  background: var(--rust);
  color: #fff;
}
.btn-primary:hover { background: var(--rust-dark); }
.btn-outline {
  background: transparent;
  border-color: var(--ink);
  color: var(--ink);
}
.btn-outline:hover { background: var(--ink); color: var(--paper-raised); }
.btn-ghost {
  background: transparent;
  color: var(--ink-soft);
  border-color: transparent;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.btn-ghost:hover { color: var(--ink); }
.btn:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; }

/* ---------- result ---------- */
.result { padding-bottom: 72px; }
.result-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}
.result-head h2 {
  font-family: 'Newsreader', serif;
  font-weight: 500;
  font-size: 26px;
  margin: 0;
}
.result-actions { display: flex; gap: 10px; }

.tabs {
  display: flex;
  gap: 2px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 0;
}
.tab {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12.5px;
  letter-spacing: 0.03em;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 10px 4px;
  margin-right: 22px;
  color: var(--ink-soft);
  cursor: pointer;
}
.tab.active { color: var(--ink); border-bottom-color: var(--rust); }

.panel { padding-top: 18px; }

.monitor {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-raised);
  padding: 8px;
}
#preview-frame {
  width: 100%;
  height: 520px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: #fff;
}

#code-output {
  width: 100%;
  height: 420px;
  resize: vertical;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--ink);
  background: #111a2b;
  color: #d8dee9;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
}

/* ---------- errors ---------- */
.error-box {
  border: 1px solid #d8ab9a;
  background: #fbeee8;
  color: var(--rust-dark);
  border-radius: var(--radius);
  padding: 16px 18px;
  margin-bottom: 56px;
  font-size: 14.5px;
}

/* ---------- footer ---------- */
.site-foot {
  border-top: 1px solid var(--line);
  padding: 24px 0 40px;
}
.site-foot p {
  color: var(--ink-soft);
  font-size: 13px;
  margin: 0;
}
.site-foot code {
  font-family: 'IBM Plex Mono', monospace;
  background: var(--paper-raised);
  border: 1px solid var(--line);
  padding: 1px 5px;
  border-radius: 2px;
}

@media (max-width: 640px) {
  .steps { grid-template-columns: 1fr; gap: 28px; }
  .dropzone { padding: 36px 18px; }
}