:root {
  --bg: #f8fafc;
  --panel: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --brand: #ec4899; /* pink-500 */
  --brand-700: #db2777; /* pink-600 */
  --border: #e5e7eb;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.45 system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
}

.container {
  max-width: 960px;
  margin: 40px auto;
  padding: 0 20px;
}

h1 { font-size: 1.8rem; margin: 0 0 8px; }
.subtitle { color: var(--muted); margin: 0 0 20px; }

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
}

.field { margin-bottom: 16px; }
label { display: block; font-weight: 600; margin-bottom: 8px; }
input[type="file"] { width: 100%; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 12px;
  margin: 6px 0 10px;
}
.checkbox { display: flex; align-items: center; gap: 10px; color: var(--muted); }
.checkbox input { width: 18px; height: 18px; }

.actions { display: flex; gap: 12px; align-items: center; }
.button, button {
  appearance: none;
  border: none;
  background: var(--brand);
  color: white;
  padding: 12px 16px;
  border-radius: 10px;
  font-weight: 600;
  cursor: pointer;
}
.button:hover, button:hover { background: var(--brand-700); }
.button.secondary { background: transparent; border: 1px solid var(--border); color: var(--text); }
button[disabled] { opacity: .5; cursor: not-allowed; }

.preview { margin-top: 20px; }
.preview h2 { margin-top: 0; font-size: 1.1rem; color: var(--muted); }
.preview iframe { width: 100%; min-height: 70vh; border: 1px solid var(--border); background: white; border-radius: 8px; }

footer { color: var(--muted); margin-top: 20px; }
footer a { color: var(--brand); text-decoration: none; }
footer a:hover { color: var(--brand-700); }

/* Toast */
.toast {
  position: fixed;
  top: 16px;
  left: 50%;
  transform: translateX(-50%) translateY(-20px);
  background: #111827;
  color: #f9fafb;
  padding: 10px 1em;
  border-radius: 999px;
  box-shadow: 0 8px 24px rgba(0,0,0,.15);
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s ease, transform .25s ease;
  z-index: 9999;
  font-size: 1.5em;
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}