:root {
  --brand-color: #2563eb;
  --bg: #f5f6f8;
  --panel-bg: #ffffff;
  --border: #e2e5ea;
  --text: #1f2430;
  --text-light: #6b7280;
  --error: #dc2626;
  --success: #16a34a;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.app-shell {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 20px 60px;
}

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  background: var(--panel-bg);
  border-radius: 12px;
  border: 1px solid var(--border);
  margin-bottom: 24px;
}

.brand { display: flex; align-items: center; gap: 10px; }
.brand h1 { font-size: 18px; margin: 0; }
.brand-dot {
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--brand-color);
  display: inline-block;
}
.client-logo { height: 32px; width: auto; border-radius: 4px; }
.header-logo { height: 36px; width: auto; }

.mode-badge {
  background: var(--brand-color);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 999px;
}

.app-main {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

@media (max-width: 800px) {
  .app-main { grid-template-columns: 1fr; }
}

.panel {
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
}

.panel h2 { margin-top: 0; font-size: 16px; color: var(--text); }

.locked-info {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
  margin-bottom: 18px;
  font-size: 13px;
  color: var(--text-light);
}
.locked-info div { margin: 3px 0; }
.locked-info strong { color: var(--text); }

.form-row { margin-bottom: 16px; }
.form-row label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-light);
}

.form-row.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.form-row.three-col { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 14px; }
@media (max-width: 500px) {
  .form-row.two-col, .form-row.three-col { grid-template-columns: 1fr; }
}

input[type="text"], select, textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
  background: #fff;
  color: var(--text);
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--brand-color);
}
textarea { resize: vertical; }

.divider { border: none; border-top: 1px solid var(--border); margin: 20px 0; }

.btn-primary {
  width: 100%;
  padding: 12px;
  background: var(--brand-color);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s;
}
.btn-primary:hover { opacity: 0.9; }
.btn-primary:disabled { opacity: 0.6; cursor: not-allowed; }

.btn-secondary {
  margin-top: 12px;
  width: 100%;
  padding: 10px;
  background: #fff;
  color: var(--brand-color);
  border: 1px solid var(--brand-color);
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}
.btn-secondary:hover { background: #f0f4ff; }

.btn-link {
  background: none;
  border: none;
  color: var(--brand-color);
  font-size: 12px;
  cursor: pointer;
  padding: 0;
  text-decoration: underline;
}

.output-box {
  min-height: 180px;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  white-space: pre-wrap;
  font-size: 14px;
  line-height: 1.6;
  background: var(--bg);
}
.output-box.empty { color: var(--text-light); font-style: italic; }
.output-box.loading { color: var(--text-light); }

.error-box {
  margin-top: 12px;
  padding: 10px 14px;
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: var(--error);
  border-radius: 8px;
  font-size: 13px;
}