/* Base page look (your requested theme) */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;600;700&display=swap');

:root{
  --bg: #f6f8fa;
  --card-bg: #fff;
  --muted: #c9d1d9;
  --text: #24292e;
  --subtle: #d0d7de;
  --accent: #0b78ff;
}

* { box-sizing: border-box; }

body {
  font-family: "Inter", system-ui, -apple-system, Roboto, "Segoe UI", Arial;
  background-color: var(--bg);
  color: var(--text);
  margin: 0;
  padding: 0;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

/* header */
header {
  text-align: center;
  padding: 2rem 1rem;
  background: #24292e;
  color: #fff;
}

header h1 {
  margin: 0;
  font-size: 1.4rem;
}

header p {
  color: var(--muted);
  margin: 0.4rem 0 0;
  font-size: 0.95rem;
}

/* main app shell */
.app-shell {
  max-width: 1100px;
  margin: 1.5rem auto;
  padding: 1.25rem;
}

/* controls layout */
.controls {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: flex-start;
  margin-bottom: 12px;
}

.control-block {
  min-width: 220px;
  flex: 0 0 220px;
}

.control-row {
  display: flex;
  gap: 12px;
  flex: 1 1 520px;
  align-items: center;
  flex-wrap: wrap;
}

.control-row label,
.control-block label {
  font-size: 0.95rem;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 140px;
}

input[type="file"] { padding:6px 4px; }

input[type="number"], input[type="text"], select {
  padding:8px 10px;
  border-radius:8px;
  border:1px solid var(--subtle);
  min-width:120px;
  font-size:0.95rem;
}

/* buttons */
.btn {
  background: var(--accent);
  color: white;
  border: none;
  padding: 10px 14px;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  gap: 8px;
  align-items: center;
}

.btn[disabled], .btn.disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn.dark {
  background: #2c2c2c;
}

/* preview card (tile-like) */
.preview {
  background: var(--card-bg);
  border: 1px solid var(--subtle);
  border-radius: 12px;
  padding: 12px;
  max-width: 520px;
  margin-top: 12px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.03);
}

.preview.hidden { display:none; }

.preview-header {
  display:flex;
  justify-content:space-between;
  align-items:center;
  margin-bottom:10px;
}

.small { font-size:0.86rem; color:#555; }

.preview-actions {
  margin-top:8px;
  display:flex;
  gap:8px;
}

/* canvas should be responsive */
canvas { display:block; max-width:100%; height:auto; background:transparent; border-radius:8px; }

/* hint and footer */
.hint {
  font-size:0.9rem;
  color:#57606a;
  margin-top:14px;
}

/* footer tile-like */
footer {
  text-align: center;
  padding: 1rem;
  background: #f1f3f5;
  color: #555;
  margin-top: 2rem;
  border-top: 1px solid #e6e9ee;
}

/* small responsive tweaks */
@media (max-width:760px){
  .control-row { flex-direction: column; align-items: stretch; }
  .control-block { flex: 1 1 auto; min-width: 0; }
  .preview { max-width: 100%; }
}