:root {
  --bg: #0f1419;
  --card: #1a222c;
  --line: #2c3846;
  --text: #e8eef5;
  --muted: #8b9aab;
  --accent: #3d9cf0;
  --ok: #3ecf8e;
  --bad: #f07178;
  --font: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 10% -10%, #1b3a5a 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, #1a2f28 0%, transparent 50%),
    var(--bg);
}

.wrap {
  width: min(640px, calc(100% - 32px));
  margin: 0 auto;
  padding: 56px 0 80px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  letter-spacing: 0.08em;
  font-size: 13px;
  text-transform: uppercase;
}

h1 {
  margin: 0 0 14px;
  font-size: clamp(28px, 5vw, 40px);
  line-height: 1.15;
  font-weight: 700;
}

.sub {
  margin: 0 0 28px;
  color: var(--muted);
  line-height: 1.6;
}

.drop {
  border: 1.5px dashed var(--line);
  background: color-mix(in srgb, var(--card) 88%, transparent);
  border-radius: 16px;
  padding: 48px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.drop:hover, .drop:focus, .drop.drag {
  border-color: var(--accent);
  background: #1c2836;
  outline: none;
}

.drop-title { margin: 0 0 6px; font-size: 18px; font-weight: 600; }
.drop-hint { margin: 0; color: var(--muted); font-size: 14px; }

.status {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 14px;
}
.status.bad { color: var(--bad); }
.status.ok { color: var(--ok); }

.result {
  margin-top: 20px;
  padding: 18px;
  border-radius: 14px;
  background: var(--card);
  border: 1px solid var(--line);
}

.result label {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 13px;
}

.row { display: flex; gap: 8px; }
.row input {
  flex: 1;
  min-width: 0;
  border: 1px solid var(--line);
  background: #121820;
  color: var(--text);
  border-radius: 10px;
  padding: 12px 14px;
  font-size: 14px;
}

button, .result a {
  border: 0;
  border-radius: 10px;
  padding: 12px 16px;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
}

.expire {
  margin: 12px 0 10px;
  color: var(--muted);
  font-size: 13px;
}

.why {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}
.why h2 { margin: 0 0 12px; font-size: 18px; }
.why ul { margin: 0; padding-left: 18px; color: var(--muted); line-height: 1.8; }