:root {
  --bg: #0f1419;
  --surface: #1a2332;
  --border: #2d3a4f;
  --text: #e8edf4;
  --muted: #8b9cb3;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --danger: #ef4444;
  --success: #22c55e;
  --radius: 10px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.container {
  max-width: 560px;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

header h1 {
  margin: 0 0 0.25rem;
  font-size: 1.75rem;
  font-weight: 600;
}

.subtitle {
  margin: 0 0 1.5rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
}

.card h2 {
  margin: 0 0 1rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

form {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
}

label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.875rem;
  color: var(--muted);
}

input {
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
}

input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

button[type="submit"] {
  margin-top: 0.25rem;
  padding: 0.65rem 1rem;
  border: none;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
}

button[type="submit"]:hover:not(:disabled) {
  background: var(--accent-hover);
}

button[type="submit"]:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.hint {
  margin: 0.75rem 0 0;
  font-size: 0.8rem;
  color: var(--muted);
}

.error {
  margin: 0.75rem 0 0;
  font-size: 0.875rem;
  color: var(--danger);
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.section-header h2 {
  margin: 0;
}

.badge {
  font-size: 0.8rem;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  background: var(--bg);
  color: var(--muted);
  border: 1px solid var(--border);
}

.plan-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.plan-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border);
}

.plan-list li:last-child {
  border-bottom: none;
}

.plan-info {
  flex: 1;
  min-width: 0;
}

.plan-amount {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--success);
}

.plan-desc {
  font-size: 0.875rem;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.delete-btn {
  flex-shrink: 0;
  padding: 0.35rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  font-size: 0.8rem;
  cursor: pointer;
}

.delete-btn:hover {
  border-color: var(--danger);
  color: var(--danger);
}

.empty {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.empty[hidden],
.plan-list:not(:empty) + .empty {
  display: none;
}

.plan-list:not(:empty) ~ .empty {
  display: none;
}

.api-card p {
  margin: 0 0 0.5rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.endpoint {
  display: block;
  padding: 0.6rem 0.75rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.85rem;
  word-break: break-all;
  color: var(--accent);
}