:root {
  --bg: #f5f5f7;
  --bg-panel: #ffffff;
  --border-subtle: #e0e0e5;
  --border-strong: #c4c4cf;
  --text-main: #1f1f24;
  --text-muted: #6b6b76;
  --accent: #2563eb;
  --accent-soft: rgba(37, 99, 235, 0.08);
  --accent-strong: #1d4ed8;
  --danger: #b91c1c;
  --radius-lg: 14px;
  --radius-md: 10px;
  --radius-sm: 6px;
  --shadow-soft: 0 14px 30px rgba(15, 23, 42, 0.08);
  --shadow-subtle: 0 1px 3px rgba(15, 23, 42, 0.08);
  --font-main: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Segoe UI", sans-serif;
}

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

html,
body {
  margin: 0;
  padding: 0;
  font-family: var(--font-main);
  color: var(--text-main);
  background: radial-gradient(circle at top left, #e5edff 0, #f5f5f7 40%, #f5f5f7 100%);
}

body {
  min-height: 100vh;
}

.app-shell {
  max-width: 1200px;
  margin: 32px auto;
  padding: 0 16px 32px;
}

/* Header */

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 24px;
  gap: 16px;
}

.app-header-main h1 {
  margin: 0 0 4px;
  font-size: 28px;
  letter-spacing: -0.02em;
}

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

.app-header-meta {
  display: flex;
  align-items: center;
  gap: 8px;
}

.badge {
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--border-subtle);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

/* Menu - Home */

.main-nav {
  background: white;
  border-bottom: 1px solid #eee;
  padding: 14px 20px;
  display: flex;
  justify-content: center;
  gap: 40px;
  font-size: 1rem;
  margin-bottom: 32px;
}

.main-nav a {
  text-decoration: none;
  color: #444;
  font-weight: 500;
  transition: color 0.2s ease;
}

.main-nav a:hover {
  color: #d4af37;
}


/* Panels */

.app-main {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.panel {
  background: var(--bg-panel);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(148, 163, 184, 0.25);
}

.panel-header {
  padding: 16px 20px 8px;
  border-bottom: 1px solid var(--border-subtle);
}

.panel-header h2 {
  margin: 0 0 4px;
  font-size: 18px;
}

.panel-header p {
  margin: 0;
  color: var(--text-muted);
  font-size: 13px;
}

.panel-body {
  padding: 16px 20px 20px;
}

.panel-body-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

/* Config cards */

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

.config-card {
  background: #fafafa;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  padding: 14px 14px 12px;
  box-shadow: var(--shadow-subtle);
}

.config-card h3 {
  margin: 0 0 4px;
  font-size: 15px;
}

.config-desc {
  margin: 0 0 10px;
  color: var(--text-muted);
  font-size: 12px;
}

/* Fields */

.field-group {
  margin-bottom: 10px;
}

.field-group:last-child {
  margin-bottom: 0;
}

.field-label {
  display: block;
  font-size: 12px;
  font-weight: 500;
  margin-bottom: 4px;
}

.field-help {
  margin: 4px 0 0;
  font-size: 11px;
  color: var(--text-muted);
}

.field-group-inline {
  display: flex;
  gap: 10px;
}

.field-group-inline > div {
  flex: 1;
}

.align-end {
  justify-content: flex-end;
}

/* Inputs */

.input,
.select,
.textarea {
  width: 100%;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  padding: 6px 8px;
  font-size: 13px;
  font-family: inherit;
  background: #ffffff;
  color: var(--text-main);
}

.input:focus,
.select:focus,
.textarea:focus {
  outline: 2px solid var(--accent-soft);
  border-color: var(--accent);
}

.textarea {
  resize: vertical;
}

/* Radio / checkbox groups */

.radio-group,
.checkbox-group {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
}

.radio-option,
.checkbox-option {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-main);
}

.radio-option input,
.checkbox-option input {
  accent-color: var(--accent);
}

/* Pills */

.pill-toggle {
  display: inline-flex;
  padding: 2px;
  border-radius: 999px;
  background: #f3f4f6;
  border: 1px solid var(--border-subtle);
}

.pill-option {
  border: none;
  background: transparent;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  cursor: pointer;
  color: var(--text-muted);
}

.pill-option.active {
  background: #ffffff;
  color: var(--accent-strong);
  box-shadow: 0 0 0 1px rgba(37, 99, 235, 0.15);
}

/* Buttons */

.btn {
  border-radius: 999px;
  border: 1px solid transparent;
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  font-family: inherit;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.btn-sm {
  padding: 4px 10px;
  font-size: 12px;
}

.btn-primary {
  background: var(--accent);
  color: #ffffff;
  border-color: var(--accent-strong);
}

.btn-primary:hover {
  background: var(--accent-strong);
}

.btn-secondary {
  background: #ffffff;
  color: var(--text-main);
  border-color: var(--border-strong);
}

.btn-secondary:hover {
  border-color: var(--accent);
}

/* Output */

.panel-output .panel-header-output {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 12px;
}

.output-meta {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.meta-pill {
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 11px;
  background: #f3f4f6;
  color: var(--text-muted);
}

.panel-body-output {
  padding-top: 10px;
}

.output-toolbar {
  display: flex;
  gap: 8px;
  margin-bottom: 10px;
}

.output-box {
  margin: 0;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: #0b1120;
  color: #e5e7eb;
  font-family: "SF Mono", ui-monospace, Menlo, Monaco, Consolas, "Liberation Mono",
    "Courier New", monospace;
  font-size: 12px;
  line-height: 1.4;
  max-height: 420px;
  overflow: auto;
  white-space: pre;
}

.output-empty {
  color: #9ca3af;
}

/* Preview box */

.preview-box {
  margin: 0;
  padding: 6px 8px;
  border-radius: var(--radius-sm);
  border: 1px dashed var(--border-subtle);
  background: #f9fafb;
  font-family: "SF Mono", ui-monospace, Menlo, Monaco, Consolas, "Liberation Mono",
    "Courier New", monospace;
  font-size: 11px;
  white-space: pre-wrap;
}

/* Utility */

.hidden {
  display: none !important;
}

/* Responsive */

@media (max-width: 768px) {
  .app-shell {
    margin-top: 20px;
  }

  .app-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .panel-header {
    padding: 14px 14px 8px;
  }

  .panel-body {
    padding: 12px 14px 14px;
  }

  .output-box {
    max-height: 320px;
  }
}