/* ==========================================================================
   Kestrel Documentation — Design System
   Inspired by Shadcn UI, Go (#00ADD8) and Kubernetes (#326CE5) brand colors.
   No purple palette. CSS variables based design tokens.
   ========================================================================== */

/* ─── Design Tokens ───────────────────────────────────────── */

:root {
  /* Brand: Go cyan + Kubernetes blue */
  --color-go: #00ADD8;
  --color-go-dark: #007D9B;
  --color-go-light: #5AC8E8;
  --color-k8s: #326CE5;
  --color-k8s-dark: #1F4FB8;
  --color-k8s-light: #6B9BFF;

  /* Neutral scale (zinc-like) */
  --color-bg: #FFFFFF;
  --color-bg-subtle: #FAFAFA;
  --color-bg-muted: #F4F4F5;
  --color-bg-elevated: #FFFFFF;
  --color-border: #E4E4E7;
  --color-border-strong: #D4D4D8;
  --color-fg: #0A0A0A;
  --color-fg-muted: #52525B;
  --color-fg-subtle: #71717A;

  /* Status colors (no purple) */
  --color-success: #16A34A;
  --color-success-bg: #F0FDF4;
  --color-warning: #EA580C;
  --color-warning-bg: #FFF7ED;
  --color-error: #DC2626;
  --color-error-bg: #FEF2F2;
  --color-info: #0284C7;
  --color-info-bg: #F0F9FF;

  /* Typography */
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", "SF Mono", "Cascadia Code",
               Consolas, "Liberation Mono", monospace;

  /* Spacing scale (4px base) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Shadow (shadcn-style) */
  --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.04);
  --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.08), 0 1px 2px -1px rgb(0 0 0 / 0.08);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.08), 0 2px 4px -2px rgb(0 0 0 / 0.08);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.08);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-focus: 0 0 0 3px rgb(50 108 229 / 0.18);

  /* Layout */
  --header-height: 4rem;
  --sidebar-width: 280px;
  --sidebar-collapsed: 0px;
  --content-max: 1280px;
  --transition: 150ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Z-index scale */
  --z-base: 1;
  --z-sticky: 100;
  --z-header: 200;
  --z-dropdown: 1000;
  --z-modal: 2000;
  --z-toast: 3000;
}

/* Dark mode tokens */
[data-theme="dark"] {
  --color-go: #5AC8E8;
  --color-go-dark: #00ADD8;
  --color-go-light: #8DDAF0;
  --color-k8s: #6B9BFF;
  --color-k8s-dark: #326CE5;
  --color-k8s-light: #9DB8FF;

  --color-bg: #09090B;
  --color-bg-subtle: #131316;
  --color-bg-muted: #1F1F23;
  --color-bg-elevated: #18181B;
  --color-border: #27272A;
  --color-border-strong: #3F3F46;
  --color-fg: #FAFAFA;
  --color-fg-muted: #A1A1AA;
  --color-fg-subtle: #71717A;

  --color-success-bg: #052E16;
  --color-warning-bg: #2A1207;
  --color-error-bg: #2A0A0A;
  --color-info-bg: #082F49;

  --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.4);
  --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.5), 0 1px 2px -1px rgb(0 0 0 / 0.5);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.5), 0 2px 4px -2px rgb(0 0 0 / 0.5);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.5), 0 4px 6px -4px rgb(0 0 0 / 0.5);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.6), 0 8px 10px -6px rgb(0 0 0 / 0.6);
  --shadow-focus: 0 0 0 3px rgb(107 155 255 / 0.3);
}

/* ─── Reset & Base ────────────────────────────────────────── */

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

html {
  -webkit-text-size-adjust: 100%;
  -moz-tab-size: 4;
  tab-size: 4;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + var(--space-4));
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--color-fg);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--space-4);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--color-fg);
}

h1 { font-size: clamp(2rem, 4vw, 2.75rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); margin-top: var(--space-12); }
h3 { font-size: 1.375rem; margin-top: var(--space-8); }
h4 { font-size: 1.125rem; margin-top: var(--space-6); }

p { margin: 0 0 var(--space-4); }

a {
  color: var(--color-k8s);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: var(--color-k8s-dark); }

code, pre, kbd, samp {
  font-family: var(--font-mono);
  font-size: 0.875em;
}

code {
  padding: 0.125em 0.375em;
  background: var(--color-bg-muted);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-go-dark);
  word-break: break-word;
}

[data-theme="dark"] code { color: var(--color-go-light); }

pre {
  margin: 0 0 var(--space-4);
  padding: var(--space-4);
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow-x: auto;
  line-height: 1.5;
}

pre code {
  padding: 0;
  background: transparent;
  border: 0;
  color: inherit;
  font-size: 0.875rem;
}

blockquote {
  margin: var(--space-4) 0;
  padding: var(--space-2) var(--space-4);
  border-left: 3px solid var(--color-go);
  background: var(--color-info-bg);
  color: var(--color-fg-muted);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

hr {
  margin: var(--space-8) 0;
  border: 0;
  border-top: 1px solid var(--color-border);
}

img, svg { max-width: 100%; height: auto; vertical-align: middle; }

ul, ol { margin: 0 0 var(--space-4); padding-left: var(--space-6); }
li { margin-bottom: var(--space-2); }

table {
  border-collapse: collapse;
  width: 100%;
  margin: var(--space-4) 0;
  font-size: 0.9375rem;
}

th, td {
  padding: var(--space-3);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

th {
  background: var(--color-bg-muted);
  font-weight: 600;
  color: var(--color-fg);
}

tbody tr:hover { background: var(--color-bg-subtle); }

::selection {
  background: var(--color-k8s);
  color: #fff;
}

:focus-visible {
  outline: 2px solid var(--color-k8s);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Scrollbar */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--color-bg-subtle); }
::-webkit-scrollbar-thumb {
  background: var(--color-border-strong);
  border-radius: var(--radius-full);
  border: 2px solid var(--color-bg-subtle);
}
::-webkit-scrollbar-thumb:hover { background: var(--color-fg-subtle); }

/* ─── Accessibility ──────────────────────────────────────── */

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-4);
  z-index: var(--z-toast);
  padding: var(--space-3) var(--space-4);
  background: var(--color-k8s);
  color: #fff;
  border-radius: var(--radius-md);
  font-weight: 600;
  transition: top var(--transition);
}
.skip-link:focus { top: var(--space-4); }

/* ─── Reduced motion ──────────────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ─── Print ───────────────────────────────────────────────── */

@media print {
  .site-header, .sidebar, .toc, .search-modal, .theme-toggle, .breadcrumb {
    display: none !important;
  }
  .main { margin: 0 !important; padding: 0 !important; }
  body { color: #000; background: #fff; }
  pre, blockquote { page-break-inside: avoid; }
}