:root {
  --blue: #2563eb;
  --blue-dark: #1d4ed8;
  --ink: #111827;
  --muted: #6b7280;
  --border: #e5e7eb;
  --bg: #f9fafb;
  --ok: #059669;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: #fff;
  line-height: 1.55;
}

a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: 880px; margin: 0 auto; padding: 0 20px; }

header.site {
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
}
header.site .wrap { display: flex; align-items: center; justify-content: space-between; }
.logo { font-size: 22px; font-weight: 700; color: var(--ink); }
.logo span { color: var(--blue); }
nav.site a { margin-left: 20px; color: var(--muted); font-weight: 500; font-size: 15px; }
nav.site a:hover { color: var(--ink); }

main { min-height: 60vh; padding: 40px 0 60px; }

h1 { font-size: 30px; margin: 0 0 10px; }
h2 { font-size: 22px; margin: 32px 0 10px; }
p.lead { color: var(--muted); font-size: 17px; margin: 0 0 30px; }

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-top: 24px;
}
.tool-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  transition: border-color .15s, box-shadow .15s;
  display: block;
}
.tool-card:hover { border-color: var(--blue); box-shadow: 0 2px 10px rgba(37,99,235,.08); text-decoration: none; }
.tool-card .icon { font-size: 26px; margin-bottom: 10px; display: block; }
.tool-card h3 { margin: 0 0 6px; font-size: 17px; color: var(--ink); }
.tool-card p { margin: 0; font-size: 14px; color: var(--muted); }

.tool-box {
  border: 2px dashed var(--border);
  border-radius: 12px;
  padding: 30px;
  text-align: center;
  margin: 24px 0;
  background: var(--bg);
}
.tool-box input[type="file"] {
  display: block;
  margin: 0 auto 16px;
  font-size: 14px;
}
button.primary {
  background: var(--blue);
  color: #fff;
  border: none;
  padding: 12px 22px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
}
button.primary:hover { background: var(--blue-dark); }
button.primary:disabled { background: #9ca3af; cursor: not-allowed; }

.field { margin: 14px 0; text-align: left; max-width: 320px; margin-left: auto; margin-right: auto; }
.field label { display: block; font-size: 13px; font-weight: 600; color: var(--muted); margin-bottom: 6px; }
.field input[type="text"], .field select {
  width: 100%; padding: 9px 10px; border: 1px solid var(--border); border-radius: 6px; font-size: 14px;
}
.field input[type="range"] { width: 100%; }

.status { margin-top: 16px; font-size: 14px; min-height: 20px; }
.status.ok { color: var(--ok); font-weight: 600; }
.status.err { color: #dc2626; font-weight: 600; }

.download-link {
  display: inline-block;
  margin-top: 12px;
  background: var(--ok);
  color: #fff;
  padding: 10px 20px;
  border-radius: 8px;
  font-weight: 600;
}
.download-link:hover { text-decoration: none; opacity: .92; }

.how-it-works { background: var(--bg); border-radius: 10px; padding: 20px 24px; margin-top: 30px; }
.how-it-works li { margin-bottom: 6px; font-size: 14px; color: var(--muted); }

footer.site {
  border-top: 1px solid var(--border);
  padding: 28px 0;
  font-size: 13px;
  color: var(--muted);
  text-align: center;
}
footer.site p { margin: 4px 0; }
footer.site .credit { font-size: 12px; color: #9ca3af; }
footer.site nav a { margin: 0 10px; color: var(--muted); }

.legal h2 { margin-top: 26px; }
.legal p, .legal li { color: var(--ink); font-size: 15px; }