/* ==========================================================================
   BASE.CSS — Design tokens, resets, typography
   BirdPersonality Games Hub
   ========================================================================== */

:root {
  /* Brand palette — bird/nature inspired, distinct from generic quiz-site look */
  --color-bg: #FBF7EF;
  --color-bg-alt: #F2ECDD;
  --color-surface: #FFFFFF;
  --color-ink: #1F2A24;
  --color-ink-soft: #4A564E;
  --color-brand: #2F6D53;       /* deep forest green — primary */
  --color-brand-dark: #204A39;
  --color-accent: #E8873F;      /* warm feather orange — CTAs, highlights */
  --color-accent-dark: #C46A28;
  --color-sky: #4A82AE;         /* secondary accent — links, info */
  --color-line: #E1D9C4;
  --color-success: #3F8F5F;
  --color-error: #C24444;

  /* Serious / mental-health tone overrides consumed via [data-tone="serious"] */
  --color-serious-bg: #F3F5F4;
  --color-serious-accent: #5C7A8A;

  /* Typography */
  --font-display: "Fraunces", Georgia, "Times New Roman", serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --fs-h1: clamp(2rem, 1.6rem + 1.8vw, 3.25rem);
  --fs-h2: clamp(1.5rem, 1.3rem + 0.9vw, 2.25rem);
  --fs-h3: clamp(1.15rem, 1.05rem + 0.5vw, 1.5rem);
  --fs-body: 1rem;
  --fs-small: 0.875rem;

  /* Spacing scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;

  /* Radii / elevation */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 28px;
  --shadow-card: 0 6px 24px rgba(31, 42, 36, 0.08);
  --shadow-card-hover: 0 12px 32px rgba(31, 42, 36, 0.14);

  /* Motion tokens (§9 / §11 — global tuning point) */
  --transition-fast: 180ms;
  --transition-base: 300ms;
  --transition-slow: 600ms;
  --ease-standard: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out-back: cubic-bezier(0.34, 1.56, 0.64, 1);

  --content-max: 72rem;
}

/* Dark surfaces are not part of v1 scope; keep tokens system-driven for later use. */

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; display: block; }

h1, h2, h3 {
  font-family: var(--font-display);
  color: var(--color-brand-dark);
  line-height: 1.15;
  margin: 0 0 var(--space-4);
}
h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }

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

a {
  color: var(--color-sky);
  text-decoration-thickness: 1.5px;
  text-underline-offset: 3px;
}
a:hover { color: var(--color-brand-dark); }

button {
  font-family: inherit;
  cursor: pointer;
}

.container {
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.visually-hidden {
  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;
  left: var(--space-4);
  top: -60px;
  background: var(--color-brand);
  color: #fff;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  z-index: 1000;
  transition: top var(--transition-base) var(--ease-standard);
}
.skip-link:focus { top: var(--space-4); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  border: none;
  border-radius: 999px;
  padding: 0.85em 1.75em;
  font-weight: 600;
  font-size: var(--fs-body);
  text-decoration: none;
  transition: transform var(--transition-fast) var(--ease-standard),
              box-shadow var(--transition-fast) var(--ease-standard),
              background var(--transition-fast) var(--ease-standard);
}
.btn-primary {
  background: var(--color-accent);
  color: #fff;
  box-shadow: var(--shadow-card);
}
.btn-primary:hover { background: var(--color-accent-dark); transform: translateY(-2px); color: #fff; }
.btn-secondary {
  background: var(--color-surface);
  color: var(--color-brand-dark);
  border: 1.5px solid var(--color-line);
}
.btn-secondary:hover { border-color: var(--color-brand); transform: translateY(-2px); }

/* Site header / nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(251, 247, 239, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-line);
}
.site-header__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-block: var(--space-3);
}
.brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.25rem;
  color: var(--color-brand-dark);
  text-decoration: none;
}
.brand__mark { font-size: 1.5rem; }

.category-nav {
  display: flex;
  flex-wrap: nowrap;
  overflow-x: auto;
  gap: var(--space-2);
  list-style: none;
  margin: 0; padding: 0;
}
.category-nav a { white-space: nowrap; }
.category-nav a {
  display: inline-block;
  padding: var(--space-2) var(--space-3);
  border-radius: 999px;
  color: var(--color-ink-soft);
  text-decoration: none;
  font-size: var(--fs-small);
  font-weight: 600;
  transition: background var(--transition-fast) var(--ease-standard), color var(--transition-fast) var(--ease-standard);
}
.category-nav a:hover,
.category-nav a[aria-current="page"] {
  background: var(--color-brand);
  color: #fff;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-line);
  margin-top: var(--space-16);
  padding-block: var(--space-8);
  color: var(--color-ink-soft);
  font-size: var(--fs-small);
}
.site-footer a { color: var(--color-ink-soft); }
.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-top: var(--space-2);
}

/* Disclaimer block (§7.1) */
.disclaimer {
  background: var(--color-serious-bg);
  border: 1px solid var(--color-line);
  border-left: 4px solid var(--color-serious-accent);
  border-radius: var(--radius-sm);
  padding: var(--space-4);
  font-size: var(--fs-small);
  color: var(--color-ink-soft);
  margin-block: var(--space-4);
}
.disclaimer strong { color: var(--color-ink); }
.disclaimer a { font-weight: 600; }

@media (max-width: 640px) {
  .site-header__bar { flex-wrap: wrap; }
  .category-nav { width: 100%; overflow-x: auto; flex-wrap: nowrap; padding-bottom: var(--space-2); }
}