:root {
  --bg: #0f0f14;
  --card: #1b1b24;
  --fg: #f4f4f6;
  --muted: #9b9ba6;
  --accent: #e1306c; /* Instagram pink */
  --border: #2c2c38;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg);
  color: var(--fg);
  padding: 1rem;
}
.card {
  width: 100%;
  max-width: 520px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem;
}
h1 { margin: 0; font-size: 1.8rem; }
.subtitle { color: var(--muted); margin: 0.25rem 0 1.5rem; }
.row { display: flex; gap: 0.5rem; }
input {
  flex: 1;
  padding: 0.75rem 1rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #12121a;
  color: var(--fg);
  font-size: 1rem;
}
input:focus { outline: 2px solid var(--accent); border-color: transparent; }
button {
  padding: 0.75rem 1.25rem;
  border: 0;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
}
button:disabled { opacity: 0.6; cursor: progress; }
.error { color: #ff6b6b; margin-top: 1rem; }
.preview { margin-top: 1.5rem; display: flex; gap: 1rem; align-items: center; }
.preview[hidden] { display: none; } /* hidden attr must win over display:flex */
.preview img { width: 120px; height: 120px; object-fit: cover; border-radius: 10px; background: #12121a; }
.title { margin: 0 0 0.75rem; font-size: 0.95rem; color: var(--fg); }
.download {
  display: inline-block;
  padding: 0.6rem 1rem;
  background: var(--accent);
  color: #fff;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 600;
}
.legal { margin-top: 2rem; font-size: 0.75rem; color: var(--muted); }