/* Minimal black & white styles */
:root {
  --bg: #F1FFD8; /* soft lime */
  --fg: #0E4D2D; /* deep green */
  --muted: #2F6D3A; /* softer green for hints */
  --border: #0E4D2D; /* deep green border */
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.5;
}

.container {
  max-width: 960px;
  padding: 24px;
  margin: 0 auto;
}

.site-header, .site-footer {
  border-bottom: 1px solid var(--border);
}
.site-footer { border-top: 1px solid var(--border); border-bottom: none; }

.brand { margin: 0; font-size: 28px; }
.tagline { margin: 8px 0 0; color: var(--muted); }

.panel { padding: 24px 0; border-bottom: 1px solid var(--border); }
.panel:last-of-type { border-bottom: none; }

.qr-form { display: grid; grid-template-columns: 1fr; gap: 12px; }
.label { font-weight: 600; }

input[type="url"], input[type="text"] {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg);
  font-size: 16px;
  border-radius: 8px;
}
input[type="url"]:focus, input[type="text"]:focus { outline: 3px solid rgba(14, 77, 45, 0.25); outline-offset: 2px; }

.hint { color: var(--muted); margin: 0; }

.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 8px; }
.btn {
  appearance: none;
  background: var(--fg);
  color: #ffffff;
  border: 1px solid var(--border);
  padding: 10px 16px;
  font-size: 15px;
  cursor: pointer;
  border-radius: 999px;
  transition: background-color 120ms ease, transform 80ms ease;
}
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn:hover:not(:disabled) { background: #0b3f25; }
.btn:active:not(:disabled) { transform: translateY(1px); }
.btn:focus { outline: 3px solid rgba(14, 77, 45, 0.25); outline-offset: 2px; }

.preview-panel { padding-top: 0; }
.qr-preview { display: grid; place-items: center; min-height: 400px; padding: 24px; border: 1px solid var(--border); border-radius: 12px; background: #ffffff; box-shadow: 0 2px 12px rgba(14,77,45,0.08); }
.qr-preview svg { width: min(80vw, 640px); height: auto; display: block; }

/* Navigation links */
.site-header nav, .site-footer nav { margin-top: 12px; }
.site-header nav a, .site-footer nav a { color: var(--fg); text-decoration: none; padding: 4px 6px; border-radius: 6px; }
.site-header nav a:hover, .site-footer nav a:hover { background: rgba(14,77,45,0.08); }
.site-header nav a[aria-current="page"], .site-footer nav a[aria-current="page"] { background: rgba(14,77,45,0.12); font-weight: 600; }