:root {
  --bg: #0f1115;
  --panel: #181b22;
  --panel-2: #21252e;
  --border: #2a2f3a;
  --text: #e6e8ee;
  --text-dim: #9aa3b2;
  --accent: #5b8def;
  --accent-hover: #4071d6;
  --danger: #e06666;
  --success: #7bc97b;
  --warn-bg: #3a2e1f;
  --warn-border: #6b4f24;
  --warn-text: #f0c987;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  min-height: 100vh;
}

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

h1 {
  font-size: 24px;
  font-weight: 600;
  margin: 0 0 8px 0;
  letter-spacing: -0.01em;
}

.subtitle {
  color: var(--text-dim);
  margin: 0 0 24px 0;
  font-size: 14px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  margin-bottom: 16px;
}

label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-dim);
  margin-bottom: 8px;
}

textarea, select, input[type="text"] {
  width: 100%;
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 12px;
  font-size: 14px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  resize: vertical;
}

textarea {
  min-height: 140px;
}

textarea:focus, select:focus, input:focus {
  outline: none;
  border-color: var(--accent);
}

select {
  font-family: inherit;
  cursor: pointer;
}

.row {
  display: flex;
  gap: 12px;
  align-items: flex-end;
}

.row > * {
  flex: 1;
}

button {
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 6px;
  padding: 12px 18px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  width: 100%;
  transition: background 120ms;
}

button:hover:not(:disabled) {
  background: var(--accent-hover);
}

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

button.secondary {
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
}

button.secondary:hover:not(:disabled) {
  background: var(--border);
}

.url-display {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 13px;
  word-break: break-all;
  user-select: all;
  margin-bottom: 12px;
}

.warn {
  background: var(--warn-bg);
  border: 1px solid var(--warn-border);
  color: var(--warn-text);
  border-radius: 6px;
  padding: 12px 14px;
  font-size: 13px;
  margin-bottom: 16px;
}

.error {
  background: #3a1f1f;
  border: 1px solid #6b2424;
  color: #f08787;
  border-radius: 6px;
  padding: 12px 14px;
  font-size: 14px;
}

.success-msg {
  color: var(--success);
  font-size: 13px;
  margin-top: 8px;
  height: 16px;
}

.hidden { display: none !important; }

.footer {
  text-align: center;
  color: var(--text-dim);
  font-size: 12px;
  margin-top: 32px;
}

.footer a {
  color: var(--text-dim);
  text-decoration: underline;
}

.center {
  text-align: center;
}

.btn-group {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}

.btn-group button {
  flex: 1;
}

@media (max-width: 480px) {
  .row { flex-direction: column; align-items: stretch; }
  .container { padding: 20px 16px; }
}