:root {
  --bg: #0f1419;
  --card: #1a222c;
  --line: #2c3846;
  --text: #e8eef5;
  --muted: #8b9aab;
  --accent: #3d9cf0;
  --ok: #3ecf8e;
  --bad: #f07178;
  --font: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(1100px 560px at 8% -10%, #1b3a5a 0%, transparent 55%),
    radial-gradient(800px 420px at 100% 0%, #1a2f28 0%, transparent 50%),
    var(--bg);
}
.wrap {
  width: min(640px, calc(100% - 32px));
  margin: 0 auto;
  padding: 52px 0 72px;
}
.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  letter-spacing: 0.08em;
  font-size: 13px;
  text-transform: uppercase;
}
h1 {
  margin: 0 0 12px;
  font-size: clamp(28px, 5vw, 40px);
  line-height: 1.15;
}
.sub { margin: 0 0 24px; color: var(--muted); line-height: 1.55; }
.drop {
  border: 1.5px dashed var(--line);
  background: color-mix(in srgb, var(--card) 88%, transparent);
  border-radius: 16px;
  padding: 44px 20px;
  text-align: center;
  cursor: pointer;
}
.drop.drag { border-color: var(--accent); }
.drop-title { margin: 0 0 6px; font-size: 18px; }
.drop-hint { margin: 0; color: var(--muted); font-size: 13px; }
.list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}
.list li {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 14px;
}
.list button {
  background: transparent;
  border: 0;
  color: var(--muted);
  cursor: pointer;
  padding: 0;
}
.check {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 14px 0;
  color: var(--muted);
  font-size: 14px;
}
#go {
  width: 100%;
  border: 0;
  border-radius: 12px;
  padding: 12px 16px;
  background: var(--accent);
  color: #fff;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
#go:disabled { opacity: 0.45; cursor: not-allowed; }
.status { margin: 12px 0 0; font-size: 14px; }
.status.ok { color: var(--ok); }
.status.bad { color: var(--bad); }
.why { margin-top: 28px; }
.why h2 { font-size: 16px; margin: 0 0 8px; }
.why ul { margin: 0; padding-left: 18px; color: var(--muted); line-height: 1.7; }