/* Fantasy Streamer — shared design tokens and base styles.
   Zero-build: no framework, no CDN, no fonts fetched. Consumed by
   index.html and how-it-works.html. Replaces the ad-hoc inline colors
   (#555, #b00020, #ddd, #f6f6f6, #fafafa, #777) that used to live in
   index.html's <style> block. */

:root {
  /* Keeps UA-rendered parts — the date picker's calendar glyph and popup — on
     the active palette. */
  color-scheme: light dark;

  /* Type scale (1.25 ratio, rem off the browser's root size — never pinned) */
  --fs-xs: 0.8rem;
  --fs-sm: 0.9rem;
  --fs-base: 1rem;
  --fs-lg: 1.25rem;
  --fs-xl: 1.5rem;
  --fs-2xl: 1.9rem;

  --lh-tight: 1.25;
  --lh-base: 1.5;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    "Liberation Mono", monospace;

  /* Spacing scale */
  --sp-1: 0.25rem;
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-6: 1.5rem;
  --sp-8: 2rem;

  --radius: 6px;
  --measure: 680px;

  /* Light palette */
  --color-bg: #ffffff;
  --color-surface: #f6f6f6;
  --color-surface-alt: #fafafa;
  --color-text: #1a1a1a;
  --color-muted: #666666;
  --color-border: #dddddd;
  --color-error: #b00020;

  /* Single accent — links, active date control, diagram highlights */
  --color-accent: #2b6cb0;
  --color-accent-contrast: #ffffff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #16181c;
    --color-surface: #212429;
    --color-surface-alt: #1b1e22;
    --color-text: #e8e8e8;
    --color-muted: #9aa0a6;
    --color-border: #3a3f45;
    --color-error: #ff6b81;

    --color-accent: #63b3ed;
    --color-accent-contrast: #16181c;
  }
}

/* ---- Shared base styles ---- */

body {
  margin: 0;
  padding: var(--sp-4);
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: var(--lh-base);
  color: var(--color-text);
  background: var(--color-bg);
}

.container {
  max-width: var(--measure);
  margin: 0 auto;
}

h1 {
  font-size: var(--fs-2xl);
  line-height: var(--lh-tight);
  margin: 0 0 var(--sp-2);
}

h2 {
  font-size: var(--fs-xl);
  line-height: var(--lh-tight);
  margin: var(--sp-8) 0 var(--sp-3);
}

h3 {
  font-size: var(--fs-lg);
  line-height: var(--lh-tight);
  margin: var(--sp-6) 0 var(--sp-2);
}

a {
  color: var(--color-accent);
}

a:hover {
  text-decoration: none;
}

.subhead {
  color: var(--color-muted);
  margin: 0 0 var(--sp-4);
}

.muted {
  color: var(--color-muted);
  font-style: italic;
}

/* Available to screen readers, clipped visually. Used for the date input's
   label, which would otherwise leave the primary control unnamed. */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---- Nav ---- */

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-4);
  font-size: var(--fs-sm);
  padding-bottom: var(--sp-3);
  margin-bottom: var(--sp-6);
  border-bottom: 1px solid var(--color-border);
}

.site-nav a {
  color: var(--color-muted);
  text-decoration: none;
}

.site-nav a:hover {
  color: var(--color-accent);
}

.site-nav a[aria-current="page"] {
  color: var(--color-accent);
  font-weight: 600;
}

/* ---- Table ---- */

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 520px;
}

th,
td {
  border: 1px solid var(--color-border);
  padding: var(--sp-2);
  text-align: left;
}

th {
  background: var(--color-surface);
}

tbody tr:nth-child(even) {
  background: var(--color-surface-alt);
}

td {
  font-size: var(--fs-sm);
}

.right {
  text-align: right;
}

/* ---- Controls / status ---- */

.controls {
  display: flex;
  gap: var(--sp-2);
  align-items: center;
  flex-wrap: wrap;
  margin: var(--sp-3) 0 var(--sp-4);
}

.controls > * {
  font-size: var(--fs-base);
}

.controls input[type="date"] {
  padding: var(--sp-1);
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.controls input[type="date"]:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 1px;
}

button {
  font-size: var(--fs-base);
  padding: var(--sp-1) var(--sp-3);
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  cursor: pointer;
}

button:hover {
  border-color: var(--color-accent);
}

.status {
  min-height: 1.25rem;
  color: var(--color-muted);
  margin: var(--sp-1) 0 var(--sp-2);
}

.status.error {
  color: var(--color-error);
}

/* ---- Inline code ---- */

code {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
}

/* ---- Footer ---- */

.site-footer {
  margin-top: var(--sp-8);
  padding-top: var(--sp-4);
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: var(--fs-sm);
}

.site-footer a {
  color: var(--color-accent);
}