:root {
  --bg: #0a0b0f;
  --panel: #12131a;
  --accent: #6ee7b7;
  --accent-2: #60a5fa;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --danger: #ef4444;
  --border: #1f2430;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font: 15px/1.5 ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, Noto Sans, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: radial-gradient(1000px 400px at 20% -20%, rgba(110,231,183,0.08), transparent),
              radial-gradient(800px 300px at 80% -10%, rgba(96,165,250,0.08), transparent),
              var(--bg);
}

header {
  padding: 28px 20px 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.brand { display: flex; align-items: center; gap: 10px; }
.brand h1 { margin: 0; font-size: 24px; letter-spacing: 0.5px; }
.brand img { width: 28px; height: 28px; }
.tag { margin: 0; color: var(--muted); }

main { max-width: 900px; margin: 10px auto 40px; padding: 0 16px; }

.card {
  background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  margin-bottom: 14px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}
.card h2, .card h3 { margin: 0 0 10px; }
.card.small { font-size: 14px; color: var(--muted); }

.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }

input[type="password"], input[type="text"], input[type="number"], textarea, select {
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 12px;
  border-radius: 10px;
  outline: none;
  min-width: 220px;
}
textarea { width: 100%; resize: vertical; }

button {
  appearance: none;
  background: #1b1f2a;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 14px;
  border-radius: 10px;
  cursor: pointer;
}
button.primary { background: linear-gradient(90deg, var(--accent), var(--accent-2)); color: #0b1020; border: none; font-weight: 600; }
button.danger { background: #2a1010; border: 1px solid #3a1515; color: #fca5a5; }
button:disabled { opacity: 0.6; cursor: not-allowed; }

.mode-row { display: flex; gap: 18px; }
.radio { display: inline-flex; gap: 8px; align-items: center; color: var(--text); opacity: 0.95; }
.radio input { transform: translateY(1px); }
.radio.disabled { color: var(--muted); opacity: 0.6; }

.hint { color: var(--muted); margin: 6px 0 0; font-size: 13px; }

.call { display: flex; flex-direction: column; gap: 10px; align-items: flex-start; }
.status { color: var(--muted); font-size: 14px; }

footer { max-width: 900px; margin: 30px auto; padding: 0 16px; display: flex; justify-content: space-between; color: var(--muted); }

.usage-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px 20px;
  align-items: start;
}
.muted { color: var(--muted); font-size: 13px; }
.large { font-size: 20px; font-weight: 600; }

details.advanced { margin-top: 10px; }
details.advanced > summary { cursor: pointer; color: var(--accent); margin-bottom: 8px; }
details.advanced h4 { margin: 6px 0; font-size: 14px; color: var(--muted); letter-spacing: 0.2px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 12px 20px; }
.checkbox { display: flex; align-items: center; gap: 8px; }