/* ================================================================
   OTTER RAFT — SHARED STYLES
   Loaded by every page. Contains: CSS variables, base reset,
   nav (both variants), footer, social buttons, responsive rules.
   ================================================================ */

/* ── DESIGN TOKENS ──────────────────────────────────────────── */
:root {
  --cream:        #FAF6EF;
  --cream-warm:   #F5EDE0;
  --cream-deep:   #EDE0CC;
  --lav:          #C4B5E8;
  --lav-mid:      #A99AD0;
  --lav-deep:     #7B6BAD;
  --sage:         #B8D4C8;
  --peach:        #F0C9A8;
  --brown:        #3D2B1E;
  --brown-mid:    #6B4F3A;
  --brown-lt:     #9B7B62;
  --ff-display:   'Fraunces', Georgia, serif;
  --ff-body:      'Plus Jakarta Sans', system-ui, sans-serif;
  --ff-hand:      'Playpen Sans', cursive;
  --ease:         cubic-bezier(0.4, 0, 0.2, 1);
  --shadow:       0 8px 32px rgba(61,43,30,0.12);
}

/* ── BASE RESET ─────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--cream);
  color: var(--brown);
  font-family: var(--ff-body);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ── NAV — shared shell ─────────────────────────────────────── */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 200;
  display: flex; align-items: center; justify-content: space-between;
  padding: 1.1rem 2.5rem;
  background: rgba(250,246,239,.88);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(196,181,232,.25);
}

.nav-logo {
  font-family: var(--ff-display);
  font-size: 1.45rem; font-weight: 600;
  letter-spacing: -.02em; color: var(--brown);
  text-decoration: none;
}
.nav-logo span { color: var(--lav-deep); }

/* main nav — language toggle */
.lang-toggle {
  display: flex; gap: 0;
  background: var(--cream-warm);
  border: 1.5px solid var(--lav);
  border-radius: 2rem; padding: .25rem;
}
.lang-btn {
  padding: .3rem .8rem; border-radius: 1.5rem;
  font-family: var(--ff-body); font-size: .8rem; font-weight: 500;
  border: none; background: transparent;
  color: var(--brown-lt); cursor: pointer;
  transition: .25s var(--ease);
}
.lang-btn.active { background: var(--lav); color: var(--brown); }

/* inner-page nav — back link + lang toggle grouped */
.nav-end {
  display: flex; align-items: center; gap: 1rem;
}
.nav-back {
  font-size: .875rem; color: var(--brown-lt);
  text-decoration: none;
  display: flex; align-items: center; gap: .4rem;
  transition: color .2s var(--ease);
}
.nav-back:hover { color: var(--lav-deep); }

/* ── LANGUAGE BLOCKS ────────────────────────────────────────
   Sections with [lang="en"] or [lang="vi"] are shown/hidden
   automatically when setLang() changes html[lang].           */
html[lang="vi"] [lang="en"] { display: none; }
html[lang="en"] [lang="vi"] { display: none; }

/* ── FOOTER ─────────────────────────────────────────────────── */
.footer {
  background: #4A2D7A;
  color: var(--cream-warm);
  padding: 3rem 2.5rem 2rem;
}
.footer-inner {
  max-width: 1100px; margin: 0 auto;
  display: flex; align-items: flex-start;
  justify-content: space-between; flex-wrap: wrap; gap: 2rem;
}
.footer-logo {
  font-family: var(--ff-display);
  font-size: 1.4rem; font-weight: 600; color: var(--cream);
}
.footer-logo span { color: var(--lav); }
.footer-tagline {
  font-family: var(--ff-hand);
  font-size: 1rem; color: #FFF8DE; margin-top: .2rem;
}
.footer-links { display: flex; gap: 1.5rem; align-items: center; flex-wrap: wrap; }
.footer-link {
  color: var(--cream-warm); text-decoration: none;
  font-size: .9rem; opacity: .65; transition: .25s var(--ease);
}
.footer-link:hover { opacity: 1; color: var(--lav); }

.footer-social { display: flex; gap: .85rem; }
.social-btn {
  width: 36px; height: 36px; border-radius: 50%;
  border: 1px solid rgba(250,246,239,.2);
  display: flex; align-items: center; justify-content: center;
  color: var(--cream-warm); text-decoration: none;
  transition: .25s var(--ease); opacity: .65;
}
.social-btn:hover { opacity: 1; border-color: var(--lav); background: rgba(196,181,232,.15); }

.footer-bottom {
  max-width: 1100px; margin: 2rem auto 0;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(250,246,239,.1);
  font-size: .8rem; color: #FFF8DE; opacity: .5;
  text-align: center;
}

/* ── RESPONSIVE ─────────────────────────────────────────────── */
@media (max-width: 768px) {
  .nav { padding: 1rem 1.25rem; }
  .footer-inner { flex-direction: column; align-items: center; text-align: center; }
  .footer-social { justify-content: center; }
  .footer-links  { justify-content: center; }
}