:root {
  --ink: #14202b;
  --muted: #5b6b7a;
  --brand: #0b5fa5;
  --brand-dark: #084a83;
  --ok: #177245;
  --bg: #f6f8fa;
  --card: #ffffff;
  --line: #d9e1e8;
}
* { box-sizing: border-box; }
body {
  margin: 0; font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--ink); background: var(--bg); line-height: 1.5;
}
header { padding: 28px 20px 8px; text-align: center; max-width: 720px; margin: 0 auto; }
h1 { margin: 0; font-size: 2.2rem; letter-spacing: -0.5px; }
.tagline { margin: 6px 0 10px; font-size: 1.08rem; color: var(--ink); }
.privacy { color: var(--muted); font-size: 0.95rem; margin: 0 auto; max-width: 560px; }
.privacy a { color: var(--brand); }
main { max-width: 720px; margin: 0 auto; padding: 16px 16px 32px; }
.tabs { display: flex; gap: 8px; margin-bottom: 12px; }
.tab {
  flex: 1; padding: 12px; border: 1px solid var(--line); background: var(--card);
  border-radius: 10px; font-size: 1rem; cursor: pointer; color: var(--muted);
}
.tab.active { background: var(--brand); border-color: var(--brand); color: #fff; font-weight: 600; }
.panel, .why {
  background: var(--card); border: 1px solid var(--line); border-radius: 14px;
  padding: 18px; margin-bottom: 16px;
}
.drop {
  display: block; border: 2px dashed var(--brand); border-radius: 12px;
  padding: 26px 16px; text-align: center; cursor: pointer; background: #eef5fb;
}
.drop-title { display: block; font-weight: 600; font-size: 1.05rem; }
.drop-sub { display: block; color: var(--muted); font-size: 0.9rem; margin-top: 4px; }
.preview { display: block; max-width: 220px; max-height: 260px; margin: 14px auto; border-radius: 8px; border: 1px solid var(--line); }
.field { display: block; margin: 12px 0 4px; font-size: 0.95rem; font-weight: 600; }
.field select, .field input {
  display: block; width: 100%; margin-top: 6px; padding: 11px; font-size: 1rem;
  border: 1px solid var(--line); border-radius: 9px; background: #fff; font-weight: 400;
}
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 12px; }
.hint { color: var(--muted); font-size: 0.9rem; }
.primary {
  display: block; width: 100%; margin-top: 16px; padding: 14px; border: 0;
  border-radius: 11px; background: var(--brand); color: #fff; font-size: 1.05rem;
  font-weight: 600; cursor: pointer; text-align: center; text-decoration: none;
}
.primary:hover { background: var(--brand-dark); }
.primary:disabled { background: #9db8cc; cursor: not-allowed; }
.result { margin-top: 18px; border-top: 1px solid var(--line); padding-top: 8px; }
.checks { list-style: none; padding: 0; margin: 10px 0; }
.checks li { padding: 5px 0 5px 26px; position: relative; }
.checks li::before { content: "✓"; position: absolute; left: 2px; color: var(--ok); font-weight: 700; }
.error { color: #b3261e; font-weight: 600; }
.why h2 { margin-top: 2px; font-size: 1.25rem; }
.why ul { padding-left: 20px; }
footer { text-align: center; color: var(--muted); padding: 8px 20px 34px; font-size: 0.92rem; max-width: 720px; margin: 0 auto; }