:root {
  --bg: #0b1110;
  --card: #121c19;
  --border: #1f2f2a;
  --text: #e8f3ef;
  --muted: #8fa89f;
  --accent: #4ade80;
  --accent-dark: #22c55e;
  --danger: #f87171;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: radial-gradient(1200px 600px at 50% -10%, #12302a 0%, var(--bg) 60%);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.5;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
}

.brand { font-size: 1.25rem; font-weight: 700; letter-spacing: 0.5px; }
.brand span { color: var(--accent); }

.container {
  width: 100%;
  max-width: 640px;
  margin: 0 auto;
  padding: 32px 20px;
  flex: 1;
}

.hero { text-align: center; margin-bottom: 28px; }
.hero h1 { font-size: 2.2rem; margin: 0 0 10px; }
.hero p { color: var(--muted); margin: 0; }
.accent { color: var(--accent); }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 22px;
  margin-bottom: 20px;
}
.card h2 { margin: 0 0 16px; font-size: 1.1rem; }

.row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--border);
}
.row:last-of-type { border-bottom: none; }

.label { color: var(--muted); font-size: 0.9rem; }
.label.block { display: block; margin: 16px 0 8px; }
.value { font-weight: 600; text-align: right; word-break: break-all; }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.9rem; }
.muted { color: var(--muted); margin: 0; }

.badge {
  font-size: 0.8rem;
  padding: 3px 10px;
  border-radius: 999px;
  background: #2a1b1b;
  color: var(--danger);
  border: 1px solid #4a2a2a;
}
.badge.ok { background: #14281d; color: var(--accent); border-color: #1f4a30; }

.actions { display: flex; gap: 10px; margin-top: 16px; flex-wrap: wrap; }

.btn {
  border: none;
  border-radius: 10px;
  padding: 10px 18px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.05s, opacity 0.2s, background 0.2s;
}
.btn:active { transform: scale(0.98); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: #062014; }
.btn-primary:hover:not(:disabled) { background: var(--accent-dark); }
.btn-ghost { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn-ghost:hover { background: #17241f; }

.input-row { display: flex; gap: 10px; margin-bottom: 8px; }
input[type="text"] {
  flex: 1;
  min-width: 0;
  background: #0d1614;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 0.9rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
input[type="text"]:focus { outline: 2px solid var(--accent); outline-offset: 0; }

.message { min-height: 1.4em; text-align: center; color: var(--muted); font-size: 0.9rem; }
.message.error { color: var(--danger); }
.message.success { color: var(--accent); }

.hidden { display: none !important; }

.footer {
  text-align: center;
  padding: 20px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.8rem;
}

@media (max-width: 480px) {
  .hero h1 { font-size: 1.7rem; }
  .row { flex-direction: column; align-items: flex-start; }
  .value { text-align: left; }
}