:root {
  color-scheme: light dark;
  --bg: #0f172a;
  --card: #111827;
  --card-border: #263244;
  --text: #e5e7eb;
  --muted: #a7b0c0;
  --accent: #60a5fa;
  --accent-strong: #2563eb;
  --success: #16a34a;
  --success-strong: #15803d;
  --redirect: #9333ea;
  --redirect-strong: #7e22ce;
  --danger: #dc2626;
  --visited: #f1f5f9;
  --visited-strong: #cbd5e1;
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(37, 99, 235, 0.22), transparent 32rem),
    var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

code {
  border: 1px solid rgba(148, 163, 184, 0.35);
  border-radius: 0.35rem;
  background: rgba(15, 23, 42, 0.68);
  padding: 0.08rem 0.28rem;
  font-size: 0.92em;
  overflow-wrap: anywhere;
}

.shell {
  width: min(100% - 2rem, 44rem);
  margin: 0 auto;
  padding: 3rem 0;
}

.hero h1 {
  margin: 0;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  line-height: 1.15;
}

.hero p {
  margin: 0.5rem 0 1.5rem;
  color: var(--muted);
}

.card {
  border: 1px solid var(--card-border);
  border-radius: 1rem;
  background: rgba(17, 24, 39, 0.88);
  padding: 1.25rem;
}

.card + .card,
#ip-list .card {
  margin-top: 1rem;
}

.ip-form label {
  display: block;
  margin-bottom: 0.4rem;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 700;
}

.ip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.ip-row input {
  flex: 1 1 12rem;
  min-height: 2.5rem;
  border: 1px solid rgba(148, 163, 184, 0.38);
  border-radius: 0.7rem;
  background: rgba(15, 23, 42, 0.55);
  color: var(--text);
  font: inherit;
  padding: 0.55rem 0.8rem;
}

.ip-row input:focus {
  border-color: var(--accent);
  outline: none;
}

.ip-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.ip-card-head h2 {
  margin: 0;
  font-size: 1.15rem;
}

.link-group {
  margin-top: 1rem;
}

.link-group h3 {
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 700;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 0.5rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.4rem;
  border: 1px solid rgba(148, 163, 184, 0.38);
  border-radius: 999px;
  background: rgba(30, 41, 59, 0.82);
  color: var(--text);
  cursor: pointer;
  font: inherit;
  font-weight: 700;
  padding: 0.45rem 0.9rem;
  text-decoration: none;
}

.button:hover,
.button:focus-visible {
  outline: none;
}

.button.primary {
  border-color: var(--accent-strong);
  background: var(--accent-strong);
  color: white;
}

.button.success {
  border-color: var(--success-strong);
  background: var(--success);
  color: white;
}

.button.redirect {
  border-color: var(--redirect-strong);
  background: var(--redirect);
  color: white;
}

.ip-card.is-visited {
  border-color: var(--visited-strong);
  background: var(--visited);
  color: #64748b;
}

.ip-card.is-visited .link-group h3,
.ip-card.is-visited .hero p {
  color: #94a3b8;
}

.ip-card.is-visited .button.primary,
.ip-card.is-visited .button.success,
.ip-card.is-visited .button.redirect {
  border-color: var(--visited-strong);
  background: #e2e8f0;
  color: #64748b;
}

.button.ghost {
  background: transparent;
}

.button.danger {
  border-color: transparent;
  color: var(--danger);
}

.empty {
  color: var(--muted);
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #eef2ff;
    --card: #ffffff;
    --card-border: #dbe2ef;
    --text: #0f172a;
    --muted: #475569;
  }

  .card,
  code,
  .ip-row input {
    background: rgba(255, 255, 255, 0.9);
  }
}