/* Shared foundations. Page composition belongs in the application stylesheet. */
:root {
  color-scheme: dark;
  --color-bg: #171717;
  --color-sidebar: #111111;
  --color-surface: #202020;
  --color-surface-raised: #262626;
  --color-surface-hover: #2c2c2c;
  --color-border: #333333;
  --color-border-strong: #555555;
  --color-text: #f5f5f5;
  --color-text-secondary: #cccccc;
  --color-text-muted: #aaaaaa;
  --color-text-subtle: #999999;
  --color-inverse-bg: #f5f5f5;
  --color-inverse-text: #171717;
  --color-focus: #eeeeee;
  --font-sans: "Inter", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.8125rem;
  --font-size-base: 0.9375rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-3xl: clamp(2rem, 4vw, 3rem);
  --font-weight-normal: 400;
  --font-weight-book: 450;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --line-height-tight: 1.15;
  --line-height-heading: 1.3;
  --line-height-ui: 1.4;
  --line-height-body: 1.65;
  --tracking-heading: -0.035em;
  --tracking-label: 0.04em;
  --space-0: 0;
  --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-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-pill: 999px;
  --control-height: 2.75rem;
  --transition-fast: 140ms ease;
  --transition-base: 200ms ease;
}

*, *::before, *::after { box-sizing: border-box; }
html {
  font-family: var(--font-sans);
  font-optical-sizing: auto;
  font-feature-settings: "liga" 1, "calt" 1;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  background: var(--color-bg);
  color: var(--color-text);
}
body {
  margin: 0;
  min-width: 20rem;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-body);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4, p, figure { margin: 0; }
h1, h2, h3, h4 {
  color: var(--color-text);
  font-weight: var(--font-weight-medium);
  line-height: var(--line-height-heading);
  text-wrap: balance;
}
h1 {
  font-size: var(--font-size-3xl);
  letter-spacing: var(--tracking-heading);
  line-height: var(--line-height-tight);
}
h2 { font-size: var(--font-size-xl); letter-spacing: -0.025em; }
h3 { font-size: var(--font-size-lg); letter-spacing: -0.015em; }
p { text-wrap: pretty; }
a { color: inherit; text-underline-offset: 0.2em; }
button, input, textarea, select { font: inherit; color: inherit; }
button, input, textarea, select, a { -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }
button:disabled, input:disabled, textarea:disabled, select:disabled { cursor: not-allowed; opacity: 0.55; }
img, video, svg { display: block; max-width: 100%; }
img, video { height: auto; }
svg { flex-shrink: 0; }
[hidden] { display: none !important; }
::selection { background: #cccccc; color: #111111; }
:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 4px; }

.button, .icon-button {
  display: inline-flex;
  min-height: var(--control-height);
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-4);
  background: var(--color-inverse-bg);
  color: var(--color-inverse-text);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  line-height: var(--line-height-ui);
  text-align: center;
  text-decoration: none;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}
.button--secondary { border-color: var(--color-border); background: transparent; color: var(--color-text); }
.button--ghost, .icon-button { background: transparent; color: var(--color-text-secondary); }
.icon-button { width: var(--control-height); min-width: var(--control-height); padding: var(--space-2); }
.icon-button svg, .button svg { width: 1.125rem; height: 1.125rem; }
@media (hover: hover) {
  .button:hover:not(:disabled) { background: #dddddd; }
  .button--secondary:hover:not(:disabled), .button--ghost:hover:not(:disabled), .icon-button:hover:not(:disabled) {
    border-color: var(--color-border);
    background: var(--color-surface-hover);
    color: var(--color-text);
  }
}
.input {
  display: block;
  width: 100%;
  min-height: var(--control-height);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: var(--font-size-base);
  line-height: var(--line-height-ui);
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}
.input::placeholder { color: var(--color-text-subtle); opacity: 1; }
.input:focus { border-color: var(--color-border-strong); }
textarea.input { min-height: 8rem; resize: vertical; line-height: var(--line-height-body); }
.empty-state {
  display: grid;
  justify-items: center;
  gap: var(--space-3);
  padding: var(--space-16) var(--space-6);
  color: var(--color-text-muted);
  text-align: center;
}
.empty-state p { max-width: 36ch; }
.text-muted { color: var(--color-text-muted); }
.tabular-nums { font-variant-numeric: tabular-nums; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  clip-path: inset(50%);
}
.skip-link {
  position: fixed;
  z-index: 1000;
  inset-block-start: var(--space-3);
  inset-inline-start: var(--space-3);
  transform: translateY(-200%);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  background: var(--color-inverse-bg);
  color: var(--color-inverse-text);
  text-decoration: none;
}
.skip-link:focus { transform: translateY(0); }
@media (max-width: 40rem) {
  input.input, select.input, textarea.input { font-size: 1rem; }
}
@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;
  }
}