/* Dạo Việt: giao diện web (bản xem thử). Mọi màu đi qua biến; sáng/tối đổi bằng data-theme. */
:root{
  --bg:#fbfaf7;--surface:#fff;--surface-2:#f3f1ea;--line:#e7e5df;--ink:#16181d;--muted:#5f6675;
  --brand:#0f766e;--brand-ink:#fff;--brand-soft:#e6f4f1;--sun:#f59e0b;--danger:#b42318;--danger-bg:#fef3f2;--ok:#067647;--ok-bg:#ecfdf3;
  --r:14px;--shadow:0 1px 2px rgba(16,24,40,.05),0 8px 24px rgba(16,24,40,.06);--max:1180px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;color-scheme:light;
}
[data-theme=dark]{
  --bg:#0d0f12;--surface:#15181d;--surface-2:#1b1f25;--line:#262b33;--ink:#eceef1;--muted:#a0a9ba;
  --brand:#2dd4bf;--brand-ink:#06201c;--brand-soft:#0f2a27;--sun:#fbbf24;--danger:#fda29b;--danger-bg:#3a1512;--ok:#6ce9a6;--ok-bg:#0f2a1c;--shadow:none;color-scheme:dark;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font:16px/1.6 var(--font);color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{margin:0;line-height:1.2;letter-spacing:-.02em;font-weight:700}
h1{font-size:clamp(2rem,4.6vw,3.4rem)}h2{font-size:clamp(1.5rem,3vw,2.1rem)}h3{font-size:1.15rem}h4{font-size:1rem}
p{margin:0}
ul{margin:0;padding:0;list-style:none}
:focus-visible{outline:2px solid var(--brand);outline-offset:3px}
.wrap{width:min(100% - 32px,var(--max));margin-inline:auto}
.muted{color:var(--muted)}.small{font-size:.875rem}
.sr{position:absolute;left:-9999px}

/* nút */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:0 22px;border-radius:999px;border:1px solid transparent;background:var(--brand);color:var(--brand-ink);font:inherit;font-weight:600;cursor:pointer;transition:transform .15s,opacity .15s}
.btn:hover{opacity:.92;transform:translateY(-1px)}
.btn-sm{min-height:38px;padding:0 16px;font-size:.9rem}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn-block{width:100%}
.chip{display:inline-block;padding:4px 10px;border-radius:999px;background:rgba(255,255,255,.92);color:#16181d;font-size:.78rem;font-weight:600}
.badge{display:inline-block;padding:3px 10px;border-radius:999px;background:var(--brand-soft);color:var(--brand);font-size:.8rem;font-weight:600}

/* khung đầu trang */
.demo-bar{background:var(--ink);color:var(--bg);text-align:center;font-size:.8rem;padding:6px 12px}
.site-header{position:sticky;top:0;z-index:40;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.header-row{display:flex;align-items:center;gap:20px;min-height:68px}
.logo{display:inline-flex;align-items:center;gap:10px;font-weight:800;font-size:1.15rem;letter-spacing:-.02em}
.logo-mark{display:grid;place-items:center;width:34px;height:34px;border-radius:10px;background:var(--brand);color:var(--brand-ink);font-weight:800}
.nav{display:flex;gap:6px;margin-left:12px}
.nav a{padding:8px 12px;border-radius:10px;color:var(--muted);font-weight:500}
.nav a:hover,.nav a[aria-current]{color:var(--ink);background:var(--surface-2)}
.header-actions{margin-left:auto;display:flex;align-items:center;gap:10px}
.phone{font-weight:600;font-size:.95rem}
.icon-btn{width:40px;height:40px;border-radius:10px;border:1px solid var(--line);background:var(--surface);color:var(--ink);cursor:pointer;font-size:1.05rem}
.menu-btn{display:none}

/* hero */
.hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line);background:linear-gradient(180deg,var(--brand-soft),var(--bg))}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center;padding:56px 0 64px}
.hero p.lead{font-size:1.15rem;color:var(--muted);margin:16px 0 24px;max-width:48ch}
.hero-art{aspect-ratio:4/3.2;border-radius:28px;background-size:cover;background-position:center;box-shadow:var(--shadow);position:relative}
.hero-art .float{position:absolute;left:-18px;bottom:24px;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:12px 16px;box-shadow:var(--shadow);font-size:.9rem}
.search{display:grid;grid-template-columns:repeat(3,1fr) auto;gap:10px;background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:12px;box-shadow:var(--shadow)}
.field label{display:block;font-size:.75rem;font-weight:600;color:var(--muted);margin:0 0 4px 4px}
input,select,textarea{width:100%;min-height:46px;padding:0 14px;border-radius:12px;border:1px solid var(--line);background:var(--surface);color:var(--ink);font:inherit}
textarea{padding:12px 14px;min-height:110px;resize:vertical}
.search .btn{align-self:end}

/* khối nội dung */
.section{padding:64px 0}
.section.alt{background:var(--surface-2)}
.section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:28px}
.section-head p{color:var(--muted);margin-top:6px}
.grid{display:grid;gap:22px}
.g3{grid-template-columns:repeat(3,1fr)}.g4{grid-template-columns:repeat(4,1fr)}.g2{grid-template-columns:repeat(2,1fr)}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;display:flex;flex-direction:column;box-shadow:var(--shadow);transition:transform .2s}
.card:hover{transform:translateY(-3px)}
.card-img{display:block;aspect-ratio:16/10;background-size:cover;background-position:center;padding:12px}
.card-body{padding:18px;display:flex;flex-direction:column;gap:8px;flex:1}
.card-body h3 a:hover{color:var(--brand)}
.card-foot{display:flex;align-items:center;justify-content:space-between;margin-top:auto;padding-top:10px}
.price{font-size:1.2rem;color:var(--brand)}
.dest-card{position:relative;border-radius:var(--r);overflow:hidden;aspect-ratio:4/5;background-size:cover;background-position:center;display:flex;align-items:flex-end;color:#fff;box-shadow:var(--shadow)}
.dest-card::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 35%,rgba(0,0,0,.65))}
.dest-card div{position:relative;z-index:1;padding:20px}
.feature{padding:22px;border:1px solid var(--line);border-radius:var(--r);background:var(--surface)}
.feature .ico{display:grid;place-items:center;width:44px;height:44px;border-radius:12px;background:var(--brand-soft);color:var(--brand);font-size:1.3rem;margin-bottom:14px}
.step{counter-increment:s;padding:22px;border-radius:var(--r);background:var(--surface);border:1px solid var(--line)}
.step::before{content:counter(s);display:grid;place-items:center;width:34px;height:34px;border-radius:50%;background:var(--ink);color:var(--bg);font-weight:700;margin-bottom:12px}
.steps{counter-reset:s}
.cta{border-radius:28px;background:var(--brand);color:var(--brand-ink);padding:44px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.cta .btn{background:var(--brand-ink);color:var(--brand)}
.notice{border:1px dashed var(--line);border-radius:var(--r);padding:20px;color:var(--muted);background:var(--surface)}

/* trang trong */
.page-head{padding:44px 0 28px;border-bottom:1px solid var(--line);background:linear-gradient(180deg,var(--brand-soft),transparent)}
.crumbs{display:flex;flex-wrap:wrap;gap:8px;font-size:.875rem;color:var(--muted);margin-bottom:14px}
.crumbs a:hover{color:var(--brand)}
.filters{display:flex;flex-wrap:wrap;gap:12px;align-items:end;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:14px;margin:26px 0}
.filters .field{min-width:170px;flex:1}
.pill-row{display:flex;flex-wrap:wrap;gap:8px}
.pill{padding:8px 16px;border-radius:999px;border:1px solid var(--line);background:var(--surface);font-weight:500}
.pill.on,.pill:hover{background:var(--ink);color:var(--bg);border-color:var(--ink)}

/* chi tiết tour */
.tour-layout{display:grid;grid-template-columns:1fr 380px;gap:40px;padding:36px 0 64px;align-items:start}
.gallery{display:grid;grid-template-columns:2fr 1fr;grid-template-rows:1fr 1fr;gap:10px;height:420px;margin-bottom:26px}
.gallery div{border-radius:var(--r);background-size:cover;background-position:center}
.gallery div:first-child{grid-row:1/3}
.meta{display:flex;flex-wrap:wrap;gap:10px;margin:14px 0 6px}
.meta span{padding:6px 12px;border-radius:999px;background:var(--surface-2);font-size:.9rem}
.block{padding:26px 0;border-top:1px solid var(--line)}
.block h2{font-size:1.4rem;margin-bottom:14px}
.ticks li{padding-left:28px;position:relative;margin:8px 0}
.ticks li::before{content:"✓";position:absolute;left:0;color:var(--brand);font-weight:700}
.ticks.x li::before{content:"✕";color:var(--danger)}
.timeline li{display:grid;grid-template-columns:64px 1fr;gap:14px;padding:12px 0;border-left:2px solid var(--line);padding-left:16px;margin-left:8px;position:relative}
.timeline li::before{content:"";position:absolute;left:-7px;top:18px;width:12px;height:12px;border-radius:50%;background:var(--brand)}
.timeline time{font-weight:700;color:var(--brand)}
details{border:1px solid var(--line);border-radius:12px;background:var(--surface);margin:10px 0}
summary{cursor:pointer;padding:14px 18px;font-weight:600;list-style:none;display:flex;justify-content:space-between;gap:12px}
summary::after{content:"+";color:var(--brand);font-size:1.3rem;line-height:1}
details[open] summary::after{content:"–"}
details>div{padding:0 18px 16px;color:var(--muted)}
.book{position:sticky;top:90px;background:var(--surface);border:1px solid var(--line);border-radius:20px;padding:22px;box-shadow:var(--shadow)}
.book .row{display:grid;gap:12px;margin-top:14px}
.book .total{display:flex;justify-content:space-between;align-items:baseline;margin:16px 0;padding-top:14px;border-top:1px dashed var(--line)}
.book .total strong{font-size:1.5rem;color:var(--brand)}
.form-ok{display:none;padding:14px;border-radius:12px;background:var(--ok-bg);color:var(--ok);margin-top:12px;font-weight:500}
.form-ok.show{display:block}
.hp{position:absolute;left:-9999px}

/* blog */
.article{max-width:760px;margin:0 auto;padding:36px 0 64px}
.article h2{margin:34px 0 10px;font-size:1.5rem}
.article p{margin:12px 0;font-size:1.06rem;color:var(--ink)}
.toc{background:var(--surface-2);border-radius:var(--r);padding:16px 20px;margin:22px 0}
.toc a{color:var(--brand)}
.post-hero{aspect-ratio:21/9;border-radius:22px;background-size:cover;background-position:center;margin:22px 0}
.post-meta{display:flex;flex-wrap:wrap;gap:14px;color:var(--muted);font-size:.9rem}
.author{display:flex;gap:14px;align-items:center;padding:18px;border:1px solid var(--line);border-radius:var(--r);margin-top:34px;background:var(--surface)}
.avatar{width:48px;height:48px;border-radius:50%;background:var(--brand-soft);color:var(--brand);display:grid;place-items:center;font-weight:700}
.cta-inline{padding:22px;border-radius:var(--r);background:var(--brand-soft);margin:28px 0;display:flex;gap:16px;align-items:center;justify-content:space-between}

/* chân trang */
.site-footer{border-top:1px solid var(--line);background:var(--surface);padding:48px 0 22px;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.3fr;gap:32px}
.site-footer h4{margin-bottom:12px}
.site-footer li{margin:7px 0;color:var(--muted)}
.site-footer li a:hover{color:var(--brand)}
.footer-bottom{margin-top:30px;padding-top:18px;border-top:1px solid var(--line);font-size:.85rem;color:var(--muted)}
.zalo-fab{position:fixed;right:16px;bottom:16px;z-index:50;width:56px;height:56px;border-radius:50%;background:#0068ff;color:#fff;display:grid;place-items:center;font-weight:800;font-size:.85rem;box-shadow:var(--shadow)}

@media (max-width:980px){
  .hero-grid,.tour-layout{grid-template-columns:1fr}
  .g4{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .book{position:static}
  .search{grid-template-columns:1fr 1fr}
  .hero-art .float{left:12px}
}
@media (max-width:720px){
  .menu-btn{display:inline-block}.hide-sm,.phone{display:none}
  .nav{position:absolute;left:0;right:0;top:100%;flex-direction:column;background:var(--bg);border-bottom:1px solid var(--line);padding:10px 16px;display:none;margin:0}
  .nav.open{display:flex}.nav a{padding:12px}
  .site-header{position:sticky}
  .g2,.g3,.g4{grid-template-columns:1fr}
  .search{grid-template-columns:1fr}
  .gallery{grid-template-columns:1fr;grid-template-rows:240px;height:auto}.gallery div:not(:first-child){display:none}.gallery div:first-child{grid-row:auto}
  .cta,.cta-inline{flex-direction:column;align-items:flex-start;padding:26px}
  .section{padding:44px 0}.footer-grid{grid-template-columns:1fr}
}