:root {
  --bg: #0f1412;
  --card: #161d1a;
  --border: #253028;
  --text: #e9f2ec;
  --dim: #8fa399;
  --accent: #5fd896;
  --warn-bg: #2b2214;
  --warn-border: #5a4420;
  --warn-text: #e8c878;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  padding-bottom: 60px;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
}

header h1 { font-size: 20px; margin: 0; }

button {
  background: var(--accent);
  color: #0a140e;
  border: none;
  border-radius: 8px;
  padding: 10px 18px;
  font-weight: 600;
  cursor: pointer;
  font-size: 14px;
}

button:hover { filter: brightness(1.08); }
button:disabled { opacity: 0.5; cursor: not-allowed; }

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 16px;
}

.banner {
  border-radius: 10px;
  padding: 14px 18px;
  margin-bottom: 20px;
  font-size: 14px;
  line-height: 1.5;
}

.banner.warning {
  background: var(--warn-bg);
  border: 1px solid var(--warn-border);
  color: var(--warn-text);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
  margin-bottom: 16px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
}

.card h2 {
  font-size: 15px;
  margin: 0 0 12px 0;
  color: var(--dim);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.row {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
  font-size: 14px;
  border-bottom: 1px solid var(--border);
}
.row:last-of-type { border-bottom: none; }

label {
  display: block;
  font-size: 13px;
  color: var(--dim);
  margin-bottom: 10px;
}

input {
  display: block;
  width: 100%;
  margin-top: 6px;
  background: #0d1210;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px;
  color: var(--text);
  font-size: 14px;
}

.hint {
  font-size: 12px;
  color: var(--dim);
  margin-top: 10px;
  line-height: 1.4;
}

footer {
  max-width: 960px;
  margin: 0 auto;
  padding: 20px 16px;
  color: var(--dim);
  font-size: 12px;
  text-align: center;
}

footer a { color: var(--accent); }

.toggle-row {
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
}

.mode-btn {
  background: #0d1210;
  color: var(--dim);
  border: 1px solid var(--border);
  flex: 1;
}

.mode-btn.active {
  background: var(--accent);
  color: #0a140e;
}