/* IBM Carbon Design System, Gray 100 look (static CSS, no React).
   Tokens follow Carbon g100 roles; PalKit legacy vars alias to them. */
@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500;600&family=IBM+Plex+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;1,400&display=swap");

:root {
  color-scheme: dark;

  /* Carbon gray ramp */
  --cds-gray-10: #f4f4f4;
  --cds-gray-20: #e0e0e0;
  --cds-gray-30: #c6c6c6;
  --cds-gray-40: #a8a8a8;
  --cds-gray-50: #8d8d8d;
  --cds-gray-60: #6f6f6f;
  --cds-gray-70: #525252;
  --cds-gray-80: #393939;
  --cds-gray-90: #262626;
  --cds-gray-100: #161616;

  /* Carbon blue / support */
  --cds-blue-40: #78a9ff;
  --cds-blue-50: #4589ff;
  --cds-blue-60: #0f62fe;
  --cds-blue-70: #0043ce;
  --cds-green-40: #42be65;
  --cds-red-50: #fa4d56;
  --cds-yellow-30: #f1c21b;
  --cds-orange-40: #ff832b;
  --cds-purple-50: #a56eff;
  --cds-teal-40: #08bdba;

  /* Theme roles (g100, contrast-tuned for long-form tool UI) */
  --cds-background: var(--cds-gray-100);
  --cds-background-hover: #353535;
  --cds-layer-01: #1e1e1e; /* between gray-100 and gray-90: clearer lift from page */
  --cds-layer-02: var(--cds-gray-80);
  --cds-layer-03: var(--cds-gray-70);
  --cds-layer-accent-01: var(--cds-gray-80);
  --cds-field-01: #262626;
  --cds-field-02: #353535;
  --cds-border-subtle-00: var(--cds-gray-70);
  --cds-border-subtle-01: var(--cds-gray-70); /* was 80: stronger panel edges */
  --cds-border-strong-01: var(--cds-gray-50);
  --cds-border-tile: var(--cds-gray-60);
  --cds-text-primary: #ffffff;
  --cds-text-secondary: var(--cds-gray-20); /* was gray-30: better body/meta contrast */
  --cds-text-placeholder: var(--cds-gray-50);
  --cds-text-on-color: #ffffff;
  --cds-text-helper: var(--cds-gray-30);
  --cds-link-primary: var(--cds-blue-40);
  --cds-link-primary-hover: var(--cds-blue-50);
  --cds-interactive: var(--cds-blue-50);
  --cds-interactive-hover: var(--cds-blue-40);
  --cds-button-primary: var(--cds-blue-60);
  --cds-button-primary-hover: var(--cds-blue-70);
  --cds-button-primary-active: #002d9c;
  --cds-button-secondary: var(--cds-gray-60);
  --cds-button-tertiary: var(--cds-blue-50);
  --cds-focus: var(--cds-blue-50);
  --cds-support-error: var(--cds-red-50);
  --cds-support-success: var(--cds-green-40);
  --cds-support-warning: var(--cds-yellow-30);
  --cds-support-info: var(--cds-blue-50);
  --cds-tag-background: var(--cds-gray-80);
  --cds-overlay: rgba(22, 22, 22, .7);

  /* spacing (Carbon 2px base scale) */
  --cds-spacing-01: .125rem;
  --cds-spacing-02: .25rem;
  --cds-spacing-03: .5rem;
  --cds-spacing-04: .75rem;
  --cds-spacing-05: 1rem;
  --cds-spacing-06: 1.5rem;
  --cds-spacing-07: 2rem;
  --cds-spacing-08: 2.5rem;
  --cds-spacing-09: 3rem;
  --cds-spacing-10: 4rem;

  --cds-radius: 0;
  --cds-radius-sm: 0;
  --cds-radius-md: 0;

  /* PalKit legacy aliases (existing CSS keeps working) */
  --bg: var(--cds-background);
  --panel: var(--cds-layer-01);
  --panel-2: var(--cds-layer-02);
  --line: var(--cds-border-subtle-01);
  --text: var(--cds-text-primary);
  --muted: var(--cds-text-secondary);
  --cyan: var(--cds-link-primary);
  --cyan-soft: color-mix(in srgb, var(--cds-interactive) 18%, var(--cds-layer-01));
  --violet: var(--cds-purple-50);
  --gold: var(--cds-yellow-30);
  --red: var(--cds-support-error);
  --shadow: none;
  --glow: none;

  /* layout chrome (nav rail): keep structure, Carbon colors */
  --rail-w: 16rem;
  --rail-collapsed: 3rem;
  --rail-gap: 0;
  --rail-pad: var(--rail-collapsed);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  /* Between pure Carbon 16px and the old PalKit 20px: readable on tool pages */
  font-size: 18px;
}

body {
  position: relative;
  min-height: 100vh;
  overflow-x: hidden;
  margin: 0;
  padding-left: var(--rail-pad);
  color: var(--cds-text-primary);
  font-family: "IBM Plex Sans", "Helvetica Neue", Arial, sans-serif;
  font-weight: 400;
  line-height: 1.55;
  letter-spacing: .01em;
  background: var(--cds-background);
}

/* Kill HUD grid / vignette if any page stylesheet still defines it */
body::before {
  content: none !important;
  display: none !important;
}

button, input, select, textarea {
  font: inherit;
}

a {
  color: var(--cds-link-primary);
}
a:hover {
  color: var(--cds-link-primary-hover);
}

::selection {
  color: var(--cds-text-on-color);
  background: var(--cds-interactive);
}

code, kbd, pre, .mono {
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

:focus-visible {
  outline: 2px solid var(--cds-focus);
  outline-offset: 1px;
}

.shell {
  width: min(99rem, calc(100% - 2rem));
  margin: 0 auto;
}