/*
 * Explore Vietnam area + shared header.
 * Explore pages use a clean pale-blue page with real photos; lesson pages keep the notebook look.
 */
:root {
  --sky: #eaf4fd;
  --sky-2: #f6fbff;
  --sky-deep: #1d5fa8;
  --sky-ink: #12304f;
  --card: #ffffff;
  --card-line: #d6e7f7;
  --soft-shadow: 0 1px 2px rgba(18, 48, 79, .06), 0 10px 28px -14px rgba(18, 48, 79, .25);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --sky: #0f2133; --sky-2: #13283d; --sky-deep: #8ec9ff; --sky-ink: #e6f1fc;
    --card: #172d43; --card-line: #26445f; --soft-shadow: 0 10px 28px -16px rgba(0, 0, 0, .6);
  }
}
:root[data-theme="dark"] {
  --sky: #0f2133; --sky-2: #13283d; --sky-deep: #8ec9ff; --sky-ink: #e6f1fc;
  --card: #172d43; --card-line: #26445f; --soft-shadow: 0 10px 28px -16px rgba(0, 0, 0, .6);
}

/* ---------- header: brand, language switch, navigation ---------- */
.topbar { flex-wrap: wrap; row-gap: 6px; }
.topbar-right { display: flex; align-items: center; gap: 8px; margin-left: auto; }
.lang-switch { display: inline-flex; border: 1.5px solid var(--card-line); border-radius: 999px; overflow: hidden; background: var(--card); }
.lang-switch button {
  border: none; background: transparent; padding: 5px 11px; font: 600 13px var(--f-body, system-ui); color: var(--muted); cursor: pointer;
}
.lang-switch button.on { background: var(--sky-deep); color: #fff; }
.menu-toggle { display: none; border: 1.5px solid var(--card-line); background: var(--card); border-radius: 10px; width: 38px; height: 34px; font-size: 18px; cursor: pointer; color: var(--sky-ink); }
.topnav { order: 3; flex-basis: 100%; display: flex; gap: 2px; overflow-x: auto; padding-bottom: 2px; scrollbar-width: none; }
.topnav::-webkit-scrollbar { display: none; }
.topnav a { flex: none; white-space: nowrap; font-size: 14px; }
.topnav .nav-search span { display: none; }
@media (max-width: 760px) {
  .menu-toggle { display: inline-block; }
  .topnav { display: none; flex-direction: column; gap: 2px; padding: 8px 0 4px; }
  body.menu-open .topnav { display: flex; animation: rise .25s ease both; }
  .topnav a { padding: 10px 12px; border-radius: 10px; font-size: 15px; }
  .topnav .nav-search span { display: inline; }
}

/* ---------- Explore area page ---------- */
body[data-area="explore"] {
  background: linear-gradient(180deg, var(--sky) 0, var(--sky-2) 520px, var(--sky-2) 100%);
  background-attachment: scroll;
}
body[data-area="explore"] .container { max-width: 1180px; }
body[data-area="explore"] h1, body[data-area="explore"] h2, body[data-area="explore"] h3 { color: var(--sky-ink); }

.xhead { padding: 22px 0 14px; }
.xhead h1 { margin: 0 0 6px; font-family: var(--f-display); font-size: clamp(26px, 4vw, 38px); text-wrap: balance; }
.xhead p { margin: 0; color: var(--muted); max-width: 65ch; }

/* hero with the ao dai illustration */
.xhero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); gap: 28px; align-items: center; padding: 18px 0 30px; }
.xkicker { font-family: var(--f-hand); font-size: 21px; color: var(--sky-deep); margin: 0 0 4px; }
.xhero h1 { font-family: var(--f-display); font-weight: 800; font-size: clamp(32px, 5vw, 54px); line-height: 1.08; margin: 0 0 14px; color: var(--sky-ink); text-wrap: balance; }
.xlead { font-size: 17px; line-height: 1.7; color: var(--text); max-width: 60ch; }
.xhero-cta { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0; }
.xhero-art { margin: 0; }
.xhero-art img {
  width: 100%; height: auto; display: block; border-radius: 28px;
  -webkit-mask-image: radial-gradient(ellipse 72% 70% at 50% 50%, #000 62%, transparent 100%);
  mask-image: radial-gradient(ellipse 72% 70% at 50% 50%, #000 62%, transparent 100%);
  animation: floatArt 9s ease-in-out infinite;
}
@keyframes floatArt { 50% { transform: translateY(-6px); } }
@media (max-width: 820px) {
  .xhero { grid-template-columns: 1fr; gap: 6px; padding-top: 6px; }
  .xhero-art { order: -1; }
}

/* search */
.xsearch { display: flex; gap: 8px; max-width: 560px; }
.xsearch input {
  flex: 1; min-width: 0; font: 16px var(--f-body); padding: 11px 16px; border-radius: 999px;
  border: 1.5px solid var(--card-line); background: var(--card); color: var(--text);
}
.xsearch input:focus { outline: 3px solid color-mix(in srgb, var(--sky-deep) 25%, transparent); border-color: var(--sky-deep); }
.xsearch.big { max-width: 720px; margin-bottom: 14px; }

/* sections */
.xsection { margin: 26px 0 34px; }
.xsection > h2, .xsection-head h2 { font-family: var(--f-display); font-size: 23px; margin: 0 0 14px; }
.xsection-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.xsection-head a { color: var(--sky-deep); font-weight: 600; text-decoration: none; }

/* cards */
.xgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 18px; }
.xgrid.six { grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); }
.xcard {
  display: flex; flex-direction: column; background: var(--card); border: 1px solid var(--card-line); border-radius: 18px;
  overflow: hidden; text-decoration: none; color: var(--text); box-shadow: var(--soft-shadow);
  transition: transform .25s ease, box-shadow .25s ease;
}
a.xcard:hover { transform: translateY(-4px); box-shadow: 0 16px 34px -16px rgba(18, 48, 79, .45); }
a.xcard:hover .ph img { transform: scale(1.05); }
.xcard-body { padding: 14px 16px 16px; display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.xcard-body h3 { margin: 0; font-family: var(--f-display); font-size: 17px; line-height: 1.3; }
.xcard-body p { margin: 0; font-size: 14.5px; color: var(--muted); line-height: 1.55; }
.xgrid.six .xcard-body { padding: 10px 12px 12px; }
.xgrid.six .xcard-body h3 { font-size: 15px; }

/* photos */
.ph { position: relative; aspect-ratio: 16 / 10; overflow: hidden; background: color-mix(in srgb, var(--sky-deep) 10%, var(--card)); max-width: 100%; }
.ph img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform .6s ease; }
.ph.wide { aspect-ratio: 21 / 9; border-radius: 20px; }
.ph.small { aspect-ratio: 1; width: 64px; flex: none; border-radius: 12px; }
.ph-empty { display: grid; place-items: center; color: var(--muted); font-size: 13px; text-align: center; padding: 8px;
  background: repeating-linear-gradient(135deg, color-mix(in srgb, var(--sky-deep) 7%, var(--card)) 0 10px, var(--card) 10px 20px); }
.ph.small.ph-empty span { font-size: 0; } .ph.small.ph-empty span::first-letter { font-size: 22px; }
.lesson-ph { display: grid; place-items: center; font-size: 26px; }
.credit { font-size: 12px; color: var(--muted); margin: 6px 2px 12px; }
.credit a { color: inherit; }

/* tags, pills, chips */
.tag { display: inline-block; font-size: 12px; font-weight: 600; color: var(--sky-deep); background: color-mix(in srgb, var(--sky-deep) 10%, transparent); padding: 2px 9px; border-radius: 999px; }
.tags { display: flex; flex-wrap: wrap; gap: 5px; }
.pill { display: inline-block; font-size: 12px; padding: 3px 10px; border-radius: 999px; margin: 4px 0; }
.pill-draft { background: #fff3cd; color: #7a5600; }
.pill-spec { background: #dff3e6; color: #1d6b3d; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 6px 0 14px; }
.chip {
  border: 1.5px solid var(--card-line); background: var(--card); color: var(--sky-ink); border-radius: 999px;
  padding: 6px 14px; font: 500 14px var(--f-body); cursor: pointer; text-decoration: none; transition: background .2s, border-color .2s;
}
.chip:hover { border-color: var(--sky-deep); }
.chip.on { background: var(--sky-deep); border-color: var(--sky-deep); color: #fff; }
.chip:disabled { opacity: .55; cursor: not-allowed; }

/* filters */
.xfilters { display: grid; gap: 8px; background: var(--card); border: 1px solid var(--card-line); border-radius: 18px; padding: 16px; margin-bottom: 14px; box-shadow: var(--soft-shadow); }
.flabel { display: block; font-size: 13px; font-weight: 600; color: var(--muted); margin-top: 4px; }
.xfilters select.text { max-width: 320px; }

/* facts */
.xfacts { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 10px; margin: 12px 0; }
.xfacts > div { background: var(--card); border: 1px solid var(--card-line); border-radius: 14px; padding: 10px 14px; display: flex; flex-direction: column; gap: 2px; }
.xfacts span { font-size: 12.5px; color: var(--muted); }
.xfacts b { font-size: 16px; color: var(--sky-ink); }
.muted { color: var(--muted); } .small { font-size: 13.5px; }

/* article */
.xarticle { background: var(--card); border: 1px solid var(--card-line); border-radius: 24px; padding: 18px; box-shadow: var(--soft-shadow); }
.xarticle h1 { font-family: var(--f-display); font-size: clamp(26px, 4vw, 38px); margin: 10px 0 2px; }
.xarticle h2 { font-family: var(--f-display); font-size: 20px; margin-top: 22px; }
.xalt { color: var(--muted); margin: 0 0 10px; }
.note { font-size: 13.5px; color: var(--muted); border-left: 3px solid #f0c24b; padding: 6px 12px; background: color-mix(in srgb, #f0c24b 10%, transparent); border-radius: 0 10px 10px 0; }
.related h3, .sources h3 { font-family: var(--f-display); font-size: 16px; margin: 18px 0 6px; }
.sources ul { margin: 0; padding-left: 18px; font-size: 14px; line-height: 1.7; }
.sources a { color: var(--sky-deep); }
@media (min-width: 900px) { .xarticle { padding: 26px 30px; } }

/* list rows (cuisine on home, search results) */
.xlist { display: grid; gap: 10px; }
.xrow { display: flex; gap: 14px; align-items: center; background: var(--card); border: 1px solid var(--card-line); border-radius: 16px; padding: 10px 12px; text-decoration: none; color: var(--text); transition: transform .2s, border-color .2s; }
.xrow:hover { transform: translateX(4px); border-color: var(--sky-deep); }
.xrow b { display: block; font-family: var(--f-display); color: var(--sky-ink); }
.xrow span { font-size: 14px; color: var(--muted); }
.xrow > div:last-child { min-width: 0; }

/* cuisine band with the food illustration */
.xfood { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 24px; align-items: center; }
.xfood-art img, .xbanner img { width: 100%; height: auto; display: block; border-radius: 24px; box-shadow: var(--soft-shadow); }
.xbanner { margin: 0 0 18px; }
.xbanner img { max-height: 380px; object-fit: cover; }
.xbanner figcaption { font-size: 12px; color: var(--muted); margin-top: 6px; }
@media (max-width: 820px) { .xfood { grid-template-columns: 1fr; } }

/* learn teaser */
.xlearn { background: linear-gradient(120deg, color-mix(in srgb, var(--sky-deep) 14%, var(--card)), var(--card)); border: 1px solid var(--card-line); border-radius: 24px; padding: 24px; }
.xlearn h2 { font-family: var(--f-display); margin: 0 0 8px; }
.xstats b { font-size: 22px; color: var(--sky-deep); }

/* guide */
.xguide { display: grid; gap: 14px; }
.xguide-item { display: flex; gap: 16px; background: var(--card); border: 1px solid var(--card-line); border-radius: 18px; padding: 16px 18px; box-shadow: var(--soft-shadow); }
.xguide-item h3 { margin: 0 0 4px; font-family: var(--f-display); }
.xguide-item p { margin: 0; }
.xicon { font-size: 30px; line-height: 1; }

.xnav-tiles { display: flex; flex-wrap: wrap; gap: 10px; }
.empty { padding: 30px 0; color: var(--muted); }

/* lesson explanation language selector on the Learn page */
.explain-lang { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 10px; font-size: 14px; }
.explain-lang .chip { margin: 0; padding: 4px 12px; font-size: 13px; }

@media (prefers-reduced-motion: reduce) {
  .xhero-art img { animation: none; }
  .xcard, .ph img, .xrow { transition: none; }
}

.xcard-body .tag, .xarticle > .tag { align-self: flex-start; }
.ph.art img { transform-origin: center; }