/* ==========================================================================
   AI Usage — admin styles
   Rigid, flat, near-monochrome. Square corners, no gradients, no decoration.
   ========================================================================== */
:root {
  --ink: #1f2329;
  --ink-soft: #57606b;
  --ink-faint: #858d98;

  --card: #ffffff;
  --panel: #f4f5f7;
  --field: #ffffff;
  --line: #d5d9df;
  --line-strong: #b9bfc7;

  --accent: #2f5f8f;
  --accent-hover: #24496e;

  --font: "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100vh;
  padding-bottom: 48px;
  background: var(--panel);
  color: var(--ink);
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.45;
}

/* ---------- top bar ---------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 12px 24px;
  background: var(--card);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 12px; min-width: 0; }
.brand-chip { width: 28px; height: 28px; display: block; }
.brand-text h1 {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--ink);
}
.brand-text p { margin: 1px 0 0; font-size: 12.5px; color: var(--ink-soft); }

/* ---------- layout ---------- */
.wrap {
  max-width: 640px;
  margin: 24px auto 0;
  padding: 0 20px;
}

.card,
.preview-card {
  background: var(--card);
  border: 1px solid var(--line);
  margin-bottom: 16px;
}
.card-head {
  padding: 10px 16px;
  border-bottom: 1px solid var(--line);
  background: var(--panel);
}
.card-head h2 {
  margin: 0;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--ink-soft);
}
.card-body { padding: 16px; display: flex; flex-direction: column; gap: 14px; }

/* ---------- fields ---------- */
.field { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.field label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}
.field-hint { margin: 0; font-size: 12px; color: var(--ink-faint); }

input[type=text], select {
  width: 100%;
  font-family: var(--font);
  font-size: 14px;
  color: var(--ink);
  background: var(--field);
  border: 1px solid var(--line-strong);
  border-radius: 0;
  padding: 8px 10px;
}
input[type=text]:focus, select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: inset 0 0 0 1px var(--accent);
}
input[type=text]::placeholder { color: var(--ink-faint); }
select {
  appearance: none;
  cursor: pointer;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'><path d='M2 4l4 4 4-4' fill='none' stroke='%2357606b' stroke-width='1.5'/></svg>");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 30px;
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font);
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  background: var(--card);
  border: 1px solid var(--line-strong);
  border-radius: 0;
  padding: 8px 14px;
  cursor: pointer;
  white-space: nowrap;
  text-decoration: none;
  transition: background-color .12s, border-color .12s;
}
.btn:hover { background: var(--panel); border-color: var(--ink-faint); }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
}
.btn.primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn:disabled { opacity: .45; cursor: not-allowed; }

/* ---------- preview ---------- */
.preview-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 16px;
  border-bottom: 1px solid var(--line);
  background: var(--panel);
}
.preview-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--ink-soft);
}
.size-badge {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-soft);
  background: var(--card);
  border: 1px solid var(--line);
  padding: 2px 8px;
  white-space: nowrap;
}
.canvas-wrap {
  padding: 16px;
  overflow: auto;
  background: #f7f8fa;
}
#canvas { display: block; max-width: 100%; height: auto; border: 1px solid var(--line); }

/* ---------- actions / share ---------- */
.actions { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; }
.share-row { display: flex; gap: 8px; margin-bottom: 10px; }
.share-row input {
  flex: 1 1 auto;
  min-width: 0;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-soft);
}
.hint { margin: 0 0 14px; font-size: 12px; color: var(--ink-faint); }
.credit {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--ink-faint);
  text-align: center;
}

.shared-only { display: none !important; }
body.shared .shared-only { display: inline-flex !important; }
.shared-by {
  margin: 0 0 14px;
  text-align: center;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
}

/* ---------- read-only shared view ---------- */
body.shared .card,
body.shared .share-row,
body.shared #btnGenerate,
body.shared #btnCopyShare { display: none !important; }

/* ---------- toast ---------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%);
  background: var(--ink);
  color: #ffffff;
  font-size: 13px;
  font-weight: 500;
  padding: 9px 16px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .18s;
  z-index: 60;
}
.toast.show { opacity: 1; }