:root {
  --bg: #0b1120;
  --card-bg: #020617;
  --accent: #38bdf8;
  --accent-soft: rgba(56, 189, 248, 0.15);
  --text: #e5e7eb;
  --muted: #9ca3af;
  --danger: #f97373;
  --success: #4ade80;
  --border: #1f2937;
  --radius: 12px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #1e293b 0, #020617 55%);
  color: var(--text);
}

#app {
  max-width: 640px;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
}

.app-header {
  text-align: center;
  margin-bottom: 1.5rem;
}

.app-header h1 {
  margin: 0;
  font-size: 1.6rem;
}

.subtitle {
  margin-top: 0.25rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 1rem 1rem 1.1rem;
  margin-bottom: 1rem;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.45);
}

.card h2 {
  margin-top: 0;
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

label {
  display: block;
  font-size: 0.85rem;
  margin-top: 0.6rem;
  margin-bottom: 0.15rem;
  color: var(--muted);
}

input,
select,
textarea,
button {
  width: 100%;
  font-size: 0.95rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  padding: 0.55rem 0.7rem;
  background: #020617;
  color: var(--text);
}

input:focus,
select:focus,
textarea:focus {
  outline: 1px solid var(--accent);
  border-color: var(--accent);
}

textarea {
  resize: vertical;
}

button {
  margin-top: 0.6rem;
  cursor: pointer;
  background: #020617;
  border: 1px solid var(--accent);
  color: var(--accent);
  font-weight: 500;
}

button.primary {
  background: var(--accent);
  color: #020617;
  border-color: var(--accent);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.status-text {
  font-size: 0.85rem;
  margin-top: 0.4rem;
  color: var(--muted);
}

.status-text.error {
  color: var(--danger);
}

.status-text.success {
  color: var(--success);
}

.log {
  background: #020617;
  border-radius: 8px;
  border: 1px solid var(--border);
  padding: 0.6rem 0.7rem;
  font-size: 0.8rem;
  margin-top: 0.6rem;
  max-height: 180px;
  overflow-y: auto;
  white-space: pre-wrap;
}

.hint {
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 0.4rem;
}

.hidden {
  display: none;
}

@media (min-width: 640px) {
  #app {
    padding: 2rem 0 3rem;
  }
}