/*
 * ui.css: Clean, eye-friendly design system inspired by shadcn/ui (Zinc palette).
 * Subtle 1px zinc borders, smooth 6px/8px radii, crisp Geist/Inter typography, and dark mode.
 */

:root {
  color-scheme: light;
  --background: #ffffff;
  --foreground: #09090b;
  --card: #ffffff;
  --card-border: #e4e4e7;
  --primary: #18181b;
  --primary-hover: #27272a;
  --primary-foreground: #fafafa;
  --accent: #f4f4f5;
  --accent-strong: #e4e4e7;
  --muted: #52525b;
  --border: #e4e4e7;
  --border-subtle: #f4f4f5;
  --input: #e4e4e7;
  --ring: #18181b;
  --radius: 6px;
  --radius-lg: 8px;
  --destructive: #dc2626;
  --destructive-bg: #fef2f2;
  --success: #059669;
  --success-bg: #ecfdf5;
  --terminal-bg: #09090b;
  --terminal-fg: #f4f4f5;
  --font: 'Geist', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --mono: 'Geist Mono', 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  /* compatibility aliases */
  --ink: var(--foreground);
  --ember: var(--primary);
  --fog: var(--background);
  /* one page width for every Kreft page (like Bootstrap's .container) */
  --container: 1240px;
  --container-pad: 28px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --background: #09090b;
    --foreground: #fafafa;
    --card: #09090b;
    --card-border: #27272a;
    --primary: #fafafa;
    --primary-hover: #e4e4e7;
    --primary-foreground: #18181b;
    --accent: #18181b;
    --accent-strong: #27272a;
    --muted: #a1a1aa;
    --border: #27272a;
    --border-subtle: #18181b;
    --input: #27272a;
    --ring: #d4d4d8;
    --destructive: #ef4444;
    --destructive-bg: #450a0a;
    --success: #10b981;
    --success-bg: #064e3b;
    --terminal-bg: #09090b;
    --terminal-fg: #f4f4f5;
  }
}

:root[data-theme="dark"], [data-theme="dark"], html.dark, .dark, [data-bs-theme="dark"] {
  color-scheme: dark;
  --background: #09090b;
  --foreground: #fafafa;
  --card: #09090b;
  --card-border: #27272a;
  --primary: #fafafa;
  --primary-hover: #e4e4e7;
  --primary-foreground: #18181b;
  --accent: #18181b;
  --accent-strong: #27272a;
  --muted: #a1a1aa;
  --border: #27272a;
  --border-subtle: #18181b;
  --input: #27272a;
  --ring: #d4d4d8;
  --destructive: #ef4444;
  --destructive-bg: #450a0a;
  --success: #10b981;
  --success-bg: #064e3b;
  --terminal-bg: #09090b;
  --terminal-fg: #f4f4f5;
  /* UI library compatibility bridge */
  --bs-body-bg: var(--background);
  --bs-body-color: var(--foreground);
  --bs-card-bg: var(--card);
  --bs-card-color: var(--foreground);
  --bs-card-border-color: var(--card-border);
  --bs-border-color: var(--border);
  --bs-tertiary-bg: var(--accent);
}

:root[data-theme="light"], [data-theme="light"], html.light, .light, [data-bs-theme="light"] {
  color-scheme: light;
  --background: #ffffff;
  --foreground: #09090b;
  --card: #ffffff;
  --card-border: #e4e4e7;
  --primary: #18181b;
  --primary-hover: #27272a;
  --primary-foreground: #fafafa;
  --accent: #f4f4f5;
  --accent-strong: #e4e4e7;
  --muted: #52525b;
  --border: #e4e4e7;
  --border-subtle: #f4f4f5;
  --input: #e4e4e7;
  --ring: #18181b;
  --destructive: #dc2626;
  --destructive-bg: #fef2f2;
  --success: #059669;
  --success-bg: #ecfdf5;
  --terminal-bg: #09090b;
  --terminal-fg: #f4f4f5;
  /* UI library compatibility bridge */
  --bs-body-bg: var(--background);
  --bs-body-color: var(--foreground);
  --bs-card-bg: var(--card);
  --bs-card-color: var(--foreground);
  --bs-card-border-color: var(--card-border);
  --bs-border-color: var(--border);
  --bs-tertiary-bg: var(--accent);
}

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

/* .container — centered, same width as the built-in pages */
.container {
  width: 100%;
  max-width: calc(var(--container) + var(--container-pad) * 2);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

@media (max-width: 760px) {
  :root { --container-pad: 16px; }
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 14.5px;
  font-weight: 400;
  line-height: 1.65;
  letter-spacing: -0.011em;
  background-color: var(--background);
  color: var(--foreground);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 12px;
  font-family: var(--font);
  line-height: 1.2;
  letter-spacing: -0.03em;
  font-weight: 700;
  color: var(--foreground);
}

h1 { font-size: clamp(30px, 4vw, 40px); font-weight: 800; letter-spacing: -0.035em; }
h2 { font-size: 24px; font-weight: 700; letter-spacing: -0.025em; }
h3 { font-size: 18px; font-weight: 600; letter-spacing: -0.015em; }
h4 { font-size: 15px; font-weight: 600; }

p { margin: 0 0 16px; color: var(--foreground); }
a { color: var(--foreground); font-weight: 500; text-underline-offset: 4px; transition: color .15s ease, background .15s ease; }
a:hover { color: var(--foreground); }
hr { border: 0; border-top: 1px solid var(--border); margin: 32px 0; }
::selection { background: var(--accent-strong); color: var(--foreground); }

/* ---- shadcn/ui Buttons ---- */
button, .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 36px;
  padding: 0 16px;
  font-family: var(--font);
  font-size: 13.5px;
  font-weight: 500;
  white-space: nowrap;
  color: var(--foreground);
  background: var(--background);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
  cursor: pointer;
  text-decoration: none;
  transition: background .15s ease, border-color .15s ease, color .15s ease;
  user-select: none;
}

button:hover, .btn:hover {
  background: var(--accent);
  color: var(--foreground);
}

button:active, .btn:active {
  transform: translateY(1px);
}

button.primary, .btn.primary {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--primary-foreground);
}

button.primary:hover, .btn.primary:hover {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
  color: var(--primary-foreground);
  opacity: 0.92;
}

button.secondary, .btn.secondary {
  background: var(--accent);
  border-color: var(--border);
  color: var(--foreground);
}

button.secondary:hover, .btn.secondary:hover {
  background: var(--accent-strong);
  border-color: var(--foreground);
}

button.ghost, .btn.ghost {
  background: transparent;
  border-color: transparent;
  color: var(--muted);
}

button.ghost:hover, .btn.ghost:hover {
  background: var(--accent);
  border-color: var(--border);
  color: var(--foreground);
}

button.danger, .btn.danger {
  background: var(--destructive);
  border-color: var(--destructive);
  color: #ffffff;
}

button.danger:hover, .btn.danger:hover {
  background: #b91c1c;
  border-color: #b91c1c;
  color: #ffffff;
}

button.sm, .btn.sm { height: 30px; padding: 0 12px; font-size: 12px; }
button.lg, .btn.lg { height: 44px; padding: 0 24px; font-size: 14px; }
button.icon-btn, .btn.icon-btn { width: 36px; height: 36px; padding: 0; display: inline-flex; align-items: center; justify-content: center; }
button:disabled, .btn[aria-disabled="true"] { opacity: .45; pointer-events: none; }

/* ---- HTML5 Dialog & Modal ---- */
dialog {
  color-scheme: inherit;
  background: var(--card);
  color: var(--foreground);
  border: 1px solid var(--border);
  padding: 24px;
  max-width: min(90vw, 540px);
  width: 100%;
}
dialog::backdrop {
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(4px);
}

/* ---- Form Fields & Controls ---- */
input, select, textarea, .input {
  font-family: var(--font);
  font-size: 13.5px;
  color: var(--foreground);
  background: var(--background);
  border: 1px solid var(--input);
  border-radius: var(--radius);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
  padding: 0 12px;
  height: 36px;
  min-width: 0;
  transition: border-color .15s ease, box-shadow .15s ease;
}

textarea { height: auto; min-height: 96px; padding: 10px 12px; line-height: 1.5; resize: vertical; }
select { padding-right: 28px; cursor: pointer; }
input[type=checkbox], input[type=radio] {
  width: 16px;
  height: 16px;
  margin: 0;
  cursor: pointer;
  accent-color: var(--primary);
  vertical-align: middle;
}

input::placeholder, textarea::placeholder { color: var(--muted); opacity: 0.7; }
.label, label.label { display: block; font-size: 13px; font-weight: 500; margin-bottom: 6px; color: var(--foreground); }
.field { display: grid; gap: 6px; margin-bottom: 18px; }
.field small { color: var(--muted); font-size: 12px; }

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

input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: none;
  border-color: #71717a;
  box-shadow: 0 0 0 3px rgba(24, 24, 27, 0.08);
  background: var(--background);
}

/* ---- shadcn/ui Cards ---- */
.card {
  background: var(--card);
  color: var(--foreground);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.02);
  padding: 24px;
  margin-bottom: 16px;
  position: relative;
}

.card > h2:first-child, .card > h1:first-child { margin-top: 0; }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 22px;
  padding: 0 8px;
  font-family: var(--font);
  font-size: 11.5px;
  font-weight: 600;
  border: 1px solid var(--border);
  border-radius: 5px;
  background: var(--accent);
  color: var(--foreground);
  text-decoration: none;
}

.badge.solid {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--primary-foreground);
}

.badge.success {
  background: var(--success-bg);
  border-color: var(--success);
  color: var(--success);
}

.alert {
  border: 1px solid var(--border);
  padding: 14px 18px;
  margin: 16px 0;
  font-size: 13px;
  line-height: 1.5;
}

.alert.danger, .error { color: var(--destructive); }
.alert.danger { border-color: var(--destructive); background: var(--destructive-bg); }
.alert.success { border-color: var(--success); background: var(--success-bg); color: var(--success); }

.muted { color: var(--muted); }
.lead { font-size: 16px; line-height: 1.5; color: var(--muted); margin-bottom: 24px; }

/* ---- Technical Terminal & Code Typography ---- */
code, kbd, .kbd {
  font-family: var(--mono);
  font-size: 0.88em;
}

code {
  background: var(--accent);
  border: 1px solid var(--border);
  padding: 2px 6px;
  color: var(--foreground);
}

kbd, .kbd {
  padding: 2px 6px;
  border: 1px solid var(--border);
  background: var(--accent);
  font-size: 11px;
}

pre {
  font-family: var(--mono);
  background: var(--terminal-bg);
  color: var(--terminal-fg);
  border: 1px solid var(--border);
  padding: 18px 20px;
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.6;
  margin: 0 0 16px;
}

pre code {
  background: none;
  border: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

/* ---- Terminal Quickstart Box ---- */
.terminal-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 16px;
  background: var(--terminal-bg);
  color: var(--terminal-fg);
  border: 1px solid var(--border);
  font-family: var(--mono);
  font-size: 13px;
}

.terminal-box .cmd {
  display: flex;
  align-items: center;
  gap: 10px;
}

.terminal-box .prompt {
  color: var(--success);
  user-select: none;
  font-weight: 700;
}

.terminal-box .copy-btn {
  height: 28px;
  padding: 0 10px;
  font-size: 11px;
  font-family: var(--mono);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #ffffff;
  cursor: pointer;
}

.terminal-box .copy-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: #ffffff;
}

/* ---- High-Precision Data Tables ---- */
table, .table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--foreground);
}

th, td {
  text-align: start;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
  color: var(--foreground);
}

th {
  font-weight: 600;
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  background: var(--accent);
  border-bottom: 1px solid var(--border);
}

tbody tr {
  transition: background .15s ease;
  background: var(--card);
}

tbody tr:hover {
  background: var(--accent);
}

/* ---- Responsive & Accessibility Rules ---- */
@media (max-width: 640px) {
  .card { padding: 18px; }
  .terminal-box { flex-direction: column; align-items: flex-start; gap: 10px; }
  .terminal-box .copy-btn { width: 100%; justify-content: center; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition: none !important;
    animation: none !important;
  }
}