/* ------------------------------------------------------------------ */
/* Design tokens                                                        */
/* ------------------------------------------------------------------ */
:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --ink: #111827;
  --muted: #6b7280;
  --line: #e5e7eb;
  --brand: #2563eb;
  --brand-dark: #1d4ed8;
  --accent: #7c3aed;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.06), 0 8px 24px rgba(16, 24, 40, 0.08);
  --wrap: 880px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif;
}

* { box-sizing: border-box; }

/* The `hidden` attribute must win over display rules like .controls{display:grid}. */
[hidden] { display: none !important; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.55;
}

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 16px;
}

/* ------------------------------------------------------------------ */
/* Header / footer                                                      */
/* ------------------------------------------------------------------ */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 56px;
  flex-wrap: wrap;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  text-decoration: none;
  color: var(--ink);
  font-size: 1.05rem;
}
.brand-mark {
  width: 18px;
  height: 18px;
  border-radius: 5px;
  background: linear-gradient(135deg, var(--brand), var(--accent));
  box-shadow: inset 0 0 0 3px rgba(255, 255, 255, 0.5);
}
.privacy-pill {
  font-size: 0.82rem;
  color: var(--muted);
  background: #eef2ff;
  border: 1px solid #e0e7ff;
  padding: 4px 10px;
  border-radius: 999px;
  white-space: nowrap;
}

.site-footer {
  margin-top: 48px;
  padding: 28px 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
}

/* ------------------------------------------------------------------ */
/* Hero + tool                                                          */
/* ------------------------------------------------------------------ */
.hero { padding: 28px 16px 8px; }
h1 {
  font-size: clamp(1.6rem, 4.5vw, 2.3rem);
  line-height: 1.15;
  margin: 0 0 8px;
}
.sub {
  color: var(--muted);
  margin: 0 0 20px;
  max-width: 60ch;
}

.tool {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
}

/* Dropzone */
.dropzone {
  border: 2px dashed #cbd5e1;
  border-radius: 12px;
  background: #fbfcfe;
  padding: 40px 16px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.dropzone:hover,
.dropzone:focus-visible { border-color: var(--brand); background: #f3f7ff; }
.dropzone.dragover {
  border-color: var(--brand);
  background: #eaf1ff;
}
.dz-icon { font-size: 2.4rem; }
.dz-title { font-weight: 600; font-size: 1.1rem; margin: 6px 0 2px; }
.dz-or { color: var(--muted); margin: 0 0 4px; }
.dz-link { color: var(--brand); font-weight: 600; text-decoration: underline; }
.dz-note { color: var(--muted); font-size: 0.82rem; margin: 6px 0 0; }
kbd {
  font: inherit;
  background: #f1f5f9;
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 5px;
  padding: 0 5px;
  font-size: 0.82em;
}

/* Canvas stage */
.stage { text-align: center; }
.canvas-holder {
  position: relative;
  display: inline-block;
  max-width: 100%;
  line-height: 0;
  background: repeating-conic-gradient(#eef0f3 0% 25%, #fff 0% 50%) 50% / 22px 22px;
  border-radius: 10px;
  overflow: hidden;
}
#canvas { max-width: 100%; height: auto; display: block; }
.overlay {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  touch-action: none;
}
.overlay.selectable { cursor: crosshair; }
.region-hint {
  color: var(--muted);
  font-size: 0.88rem;
  margin: 10px auto 0;
  max-width: 46ch;
}

/* Controls */
.controls { margin-top: 16px; display: grid; gap: 14px; }
.control-row { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.slider-label {
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-flex;
  gap: 6px;
  min-width: 120px;
}
.slider-label output {
  color: var(--brand);
  font-variant-numeric: tabular-nums;
}
#blockSlider { flex: 1; min-width: 160px; accent-color: var(--brand); }

.modes { gap: 8px; }
.seg,
.btn-face,
.btn-ghost,
.btn-primary {
  font: inherit;
  border-radius: 9px;
  padding: 9px 14px;
  cursor: pointer;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  transition: background 0.12s, border-color 0.12s, box-shadow 0.12s;
}
.seg.active {
  background: var(--brand);
  border-color: var(--brand);
  color: #fff;
}
.btn-face {
  background: linear-gradient(135deg, var(--brand), var(--accent));
  border: none;
  color: #fff;
  font-weight: 600;
  margin-left: auto;
}
.btn-face:disabled { opacity: 0.6; cursor: default; }
.btn-ghost { color: var(--muted); }
.btn-ghost:hover { border-color: #cbd5e1; }

.download-row { border-top: 1px solid var(--line); padding-top: 14px; }
.fmt-label { font-weight: 600; font-size: 0.9rem; }
#formatSelect {
  font: inherit;
  padding: 9px 10px;
  border-radius: 9px;
  border: 1px solid var(--line);
  background: var(--surface);
}
.btn-primary {
  background: var(--brand);
  border-color: var(--brand);
  color: #fff;
  font-weight: 600;
  min-width: 120px;
}
.btn-primary:hover { background: var(--brand-dark); }
.btn-primary:disabled { opacity: 0.6; cursor: default; }
#resetBtn { margin-left: auto; }

.status {
  min-height: 20px;
  font-size: 0.88rem;
  color: var(--muted);
  text-align: center;
  opacity: 0;
  transition: opacity 0.15s;
}
.status.visible { opacity: 1; }

/* ------------------------------------------------------------------ */
/* LP content                                                           */
/* ------------------------------------------------------------------ */
.content { padding: 8px 16px; }
.content h2 {
  font-size: 1.35rem;
  margin: 34px 0 12px;
}
.steps,
.cases { padding-left: 22px; margin: 0; display: grid; gap: 10px; }
.steps li,
.cases li { padding-left: 4px; }

.faq { display: grid; gap: 10px; }
.faq details {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 4px 14px;
}
.faq summary {
  cursor: pointer;
  font-weight: 600;
  padding: 10px 0;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "＋"; float: right; color: var(--muted); }
.faq details[open] summary::after { content: "－"; }
.faq p { margin: 0 0 12px; color: #374151; }

/* ------------------------------------------------------------------ */
/* Mobile                                                               */
/* ------------------------------------------------------------------ */
@media (max-width: 560px) {
  .privacy-pill { display: none; }
  .btn-face { margin-left: 0; width: 100%; order: 3; }
  #resetBtn { margin-left: 0; }
  .slider-label { min-width: 100%; }
  .modes { gap: 8px; }
  .seg { flex: 1; }
  .download-row { gap: 8px; }
  .btn-primary { flex: 1; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}