:root {
  --bg: #0f1419;
  --panel: #182029;
  --line: #2a3642;
  --text: #e8eef4;
  --muted: #8b9aab;
  --accent: #2f9e7f;
  --accent-press: #247a62;
  --danger: #d45b5b;
  --ok: #3cb371;
  --font: "IBM Plex Sans", "Segoe UI", "PingFang SC", "Hiragino Sans GB", sans-serif;
  --mono: "IBM Plex Mono", "SF Mono", Menlo, Consolas, monospace;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(1000px 500px at 10% -10%, rgba(47, 158, 127, 0.18), transparent 60%),
    radial-gradient(800px 400px at 90% 0%, rgba(70, 120, 180, 0.16), transparent 55%),
    linear-gradient(180deg, #10161d 0%, #0c1116 100%);
}

.wrap {
  width: min(560px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 4rem 0 3rem;
}

.header {
  margin-bottom: 1.75rem;
}

.brand {
  margin: 0 0 0.75rem;
  font-size: 0.85rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
}

h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.6rem, 4vw, 2rem);
  font-weight: 650;
  letter-spacing: -0.02em;
}

.desc {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
}

.form {
  display: grid;
  gap: 1rem;
  padding: 1.25rem;
  background: color-mix(in srgb, var(--panel) 92%, black);
  border: 1px solid var(--line);
  border-radius: 14px;
}

.sites {
  margin: 0;
  padding: 0;
  border: 0;
  display: grid;
  gap: 0.65rem;
}

.sites legend {
  margin-bottom: 0.55rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.site {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.8rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.site:hover,
.site:has(input:checked) {
  border-color: color-mix(in srgb, var(--accent) 70%, var(--line));
  background: color-mix(in srgb, var(--accent) 10%, transparent);
}

.site input {
  accent-color: var(--accent);
}

.site strong {
  display: block;
  font-size: 1rem;
}

.site small {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.78rem;
}

.field {
  display: grid;
  gap: 0.4rem;
}

.field span {
  color: var(--muted);
  font-size: 0.9rem;
}

.field input {
  width: 100%;
  padding: 0.85rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #10171e;
  color: var(--text);
  font: inherit;
  outline: none;
}

.field input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(47, 158, 127, 0.18);
}

button {
  margin-top: 0.25rem;
  padding: 0.9rem 1rem;
  border: 0;
  border-radius: 10px;
  background: var(--accent);
  color: #04130e;
  font: inherit;
  font-weight: 650;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.1s ease;
}

button:hover {
  background: var(--accent-press);
}

button:active {
  transform: translateY(1px);
}

button:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

.result {
  margin-top: 1rem;
  padding: 1rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(16, 23, 30, 0.8);
}

.result h2 {
  margin: 0 0 0.6rem;
  font-size: 0.95rem;
  font-weight: 600;
}

.result.ok {
  border-color: color-mix(in srgb, var(--ok) 45%, var(--line));
}

.result.err {
  border-color: color-mix(in srgb, var(--danger) 45%, var(--line));
}

pre {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.5;
  color: #c9d5e1;
}