:root {
  --bg: #0f1412;
  --card: #171e1b;
  --line: #2a3530;
  --text: #e8efe9;
  --muted: #9aada3;
  --accent: #2fd17a;
  --warn: #f0b429;
  --bad: #ef6b6b;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, sans-serif;
  background:
    radial-gradient(1200px 500px at 10% -10%, #1c3a2c 0%, transparent 50%),
    var(--bg);
  color: var(--text);
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 40px 20px 80px;
}

.eyebrow {
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 12px;
  color: var(--accent);
  margin: 0 0 8px;
}

h1, h2 { margin: 0 0 12px; }
h2 { font-size: 18px; }

.lead, .brand {
  color: var(--muted);
  line-height: 1.5;
}

code {
  background: #0b100e;
  padding: 1px 6px;
  border-radius: 4px;
}

form, .result, .history, .alert {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px;
  margin-top: 20px;
}

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.span-2 { grid-column: span 2; }

label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 13px;
  color: var(--muted);
}

input {
  background: #0d1210;
  border: 1px solid var(--line);
  color: var(--text);
  border-radius: 10px;
  padding: 12px;
  font-size: 16px;
}

button {
  margin-top: 18px;
  width: 100%;
  border: 0;
  border-radius: 12px;
  padding: 14px;
  background: var(--accent);
  color: #062016;
  font-weight: 700;
  font-size: 16px;
  cursor: pointer;
}

button:disabled {
  opacity: 0.6;
  cursor: wait;
}

.hidden { display: none; }

.ok { border-color: var(--accent); }
.warn { border-color: var(--warn); }
.bad { border-color: var(--bad); }

.result h3 { margin-top: 0; }
.result p { margin: 6px 0; color: var(--muted); }

.row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
}

.row:last-child { border-bottom: 0; }

@media (max-width: 640px) {
  .grid, .span-2 { grid-template-columns: 1fr; grid-column: auto; }
}