:root{
  --green:#0b5c8f; --green-d:#08395c; --green-l:#e1eff8;
  --earth:#c26a1a; --gold:#e3b04b;
  --cream:#eef6fb; --paper:#fbfdff; --ink:#14232e; --muted:#51636f; --line:#d3e2ec;
  --r:14px; --max:1120px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"Be Vietnam Pro",system-ui,sans-serif;color:var(--ink);background:var(--paper);line-height:1.7;font-size:17px;-webkit-text-size-adjust:100%}
h1,h2,h3{font-family:Lora,Georgia,serif;line-height:1.25;margin:0 0 .5em;color:var(--green-d)}
a{color:var(--green);text-underline-offset:3px}
img,svg{max-width:100%}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}

/* header */
.site-header{position:sticky;top:0;z-index:20;background:rgba(255,253,248,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.bar{display:flex;align-items:center;justify-content:space-between;height:68px;gap:16px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink)}
.brand .mark{width:42px;height:42px;border-radius:12px;background:var(--green);color:#f3e7c9;display:grid;place-items:center;font:700 24px Lora,serif}
.brand strong{display:block;white-space:nowrap;font-family:Lora,serif;font-size:18px;color:var(--green-d);line-height:1.1}
.brand small{color:var(--muted);font-size:12px}
.nav{display:flex;align-items:center;gap:22px}
.nav a{text-decoration:none;color:var(--ink);font-weight:500;font-size:15px}
.nav a[aria-current]{color:var(--earth)}
.nav a:hover{color:var(--earth)}
.menu-btn{display:none;background:none;border:1px solid var(--line);border-radius:10px;padding:8px 14px;font:inherit;font-weight:600;color:var(--green-d)}

/* buttons */
.btn{display:inline-block;background:var(--green);color:#fff!important;text-decoration:none;font-weight:600;padding:13px 24px;border-radius:999px;border:2px solid var(--green);transition:.15s}
.btn:hover{background:var(--green-d);border-color:var(--green-d)}
.btn-sm{padding:8px 18px;font-size:15px}
.nav .btn{color:#fff}
.btn-ghost-dark{background:transparent;color:var(--green)!important}
.btn-ghost-dark:hover{background:var(--green);color:#fff!important}
.btn-light{background:#fff;color:var(--green-d)!important;border-color:#fff}
.btn-light:hover{background:var(--cream);border-color:var(--cream)}
.btn-ghost{background:transparent;color:#fff!important;border-color:rgba(255,255,255,.6)}
.btn-ghost:hover{background:rgba(255,255,255,.12);border-color:#fff}

/* hero */
.hero{background:linear-gradient(135deg,#eaf5fc 0%,#cfe6f4 100%);border-bottom:1px solid var(--line);position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;right:-120px;top:-120px;width:420px;height:420px;border-radius:50%;background:radial-gradient(circle,rgba(11,92,143,.16),transparent 70%)}
.hero-in{display:grid;grid-template-columns:1.5fr 1fr;gap:48px;align-items:center;padding:72px 20px;position:relative;z-index:1}
.eyebrow{color:var(--earth);font-weight:700;letter-spacing:.08em;text-transform:uppercase;font-size:13px;margin:0 0 12px}
.hero h1{font-size:clamp(32px,5vw,52px);margin-bottom:18px}
.lead{font-size:19px;color:var(--muted);max-width:60ch}
.hero-btns{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}
.hero-card{background:var(--paper);border:1px solid var(--line);border-radius:20px;padding:28px;text-align:center;box-shadow:0 10px 30px rgba(8,57,92,.10)}
.avatar{width:88px;height:88px;border-radius:50%;background:var(--green);color:#f3e7c9;display:grid;place-items:center;font:700 44px Lora,serif;margin:0 auto 12px}
.hero-card strong{display:block;font-family:Lora,serif;font-size:20px;color:var(--green-d)}
.hero-card>span{color:var(--earth);font-weight:600}
.hero-card ul{list-style:none;padding:0;margin:16px 0 0;text-align:left;border-top:1px solid var(--line);padding-top:14px}
.hero-card li{padding:4px 0 4px 24px;position:relative;font-size:15px}
.hero-card li::before{content:"";position:absolute;left:4px;top:13px;width:10px;height:10px;border-radius:50%;background:var(--gold)}

/* sections */
.sec{padding:64px 0}
.sec.alt{background:var(--cream)}
.sec-h{font-size:clamp(24px,3vw,32px);margin-bottom:28px}
.sec-head{display:flex;justify-content:space-between;align-items:baseline;gap:16px}
.sec-head a{font-weight:600;text-decoration:none;white-space:nowrap}
.page-h{background:var(--cream);border-bottom:1px solid var(--line);padding:48px 0 36px}
.page-h h1{font-size:clamp(28px,4vw,42px);margin:0 0 8px}
.page-h .lead{margin:0}
.grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.two{display:grid;grid-template-columns:1.4fr 1fr;gap:48px;align-items:start}

/* cards */
.card{display:block;background:var(--paper);border:1px solid var(--line);border-radius:var(--r);padding:24px;text-decoration:none;color:var(--ink);transition:.18s}
a.card:hover{transform:translateY(-3px);box-shadow:0 12px 28px rgba(8,57,92,.12);border-color:var(--gold)}
.card h3{font-size:19px;margin-bottom:8px}
.card p{color:var(--muted);font-size:15px;margin:0}
.topic .num{display:inline-block;font:700 14px Lora,serif;color:var(--earth);border:1.5px solid var(--earth);border-radius:999px;padding:2px 10px;margin-bottom:12px}
.art{display:flex;flex-direction:column;gap:6px}
.art .meta{margin-top:auto;padding-top:10px}
.tag{display:inline-block;align-self:flex-start;background:var(--green-l);color:var(--green);font-size:12px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;padding:3px 10px;border-radius:999px}
.meta{color:var(--muted);font-size:13.5px}
.why{background:var(--green-l);border-radius:var(--r);padding:26px}
.why h3{font-size:19px}
.why ul,.why ol{padding-left:20px;margin:0}
.why li{margin:8px 0}
.small{font-size:14px;color:var(--muted)}
.big{font:700 28px Lora,serif;text-decoration:none}

/* chips */
.chips{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:28px}
.chip{font:inherit;font-weight:600;font-size:15px;padding:8px 18px;border-radius:999px;border:1.5px solid var(--line);background:var(--paper);color:var(--ink);cursor:pointer}
.chip.on,.chip:hover{background:var(--green);border-color:var(--green);color:#fff}

/* article */
.post{max-width:760px;padding-top:40px;padding-bottom:48px}
.post h1{font-size:clamp(28px,4.2vw,40px);margin:12px 0 10px}
.crumb{font-size:14px;color:var(--muted);margin:0 0 14px}
.crumb a{color:var(--muted)}
.prose{font-size:18px}
.prose h2{font-size:25px;margin:2em 0 .5em}
.prose p{margin:0 0 1.1em}
.prose ul,.prose ol{padding-left:24px;margin:0 0 1.2em}
.prose li{margin:.4em 0}
.callout{border-left:4px solid var(--earth);background:#fff4e3;padding:16px 20px;border-radius:0 var(--r) var(--r) 0;margin:1.6em 0}
.tbl{overflow-x:auto;margin:1.4em 0}
table{border-collapse:collapse;width:100%;font-size:16px}
th,td{border:1px solid var(--line);padding:10px 14px;text-align:left}
th{background:var(--green-l);color:var(--green-d)}
td:last-child,th:last-child{text-align:right;white-space:nowrap}
.note-box{margin-top:36px;padding:16px 20px;background:var(--cream);border:1px dashed var(--gold);border-radius:var(--r);font-size:15px;color:var(--muted)}

/* cta + footer */
.cta{background:var(--green);color:#fff}
.cta-in{display:flex;align-items:center;justify-content:space-between;gap:32px;padding:44px 20px}
.cta h2{color:#fff;font-size:26px;margin-bottom:6px}
.cta p{margin:0;color:#d6e9f5;max-width:56ch}
.cta-btns{display:flex;gap:12px;flex-wrap:wrap}
.site-footer{background:var(--green-d);color:#cfe0ec;padding:40px 0 20px;font-size:15px}
.site-footer a{color:#f3e7c9}
.site-footer strong{color:#fff;font-family:Lora,serif;font-size:18px}
.foot{display:grid;grid-template-columns:1fr 1.3fr;gap:40px}
.foot p{margin:.4em 0}
.disclaimer{font-size:13.5px;color:#a6c1d3}
.copy{margin-top:28px;padding-top:16px;border-top:1px solid rgba(255,255,255,.14);font-size:13px;color:#86a6bb}
.float-zalo{position:fixed;right:16px;bottom:16px;z-index:30;background:#0068ff;color:#fff;font-weight:700;text-decoration:none;padding:12px 18px;border-radius:999px;box-shadow:0 6px 18px rgba(0,0,0,.25)}

/* responsive */

.grid5{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.steps{padding-left:22px;margin:0}.steps li{margin:10px 0}
.empty,.empty-card{color:var(--muted)}
.empty-card{background:var(--paper);border:1px dashed var(--gold)}
.facts{list-style:none;padding:0;margin:10px 0 14px;font-size:15px}
.facts li{display:flex;justify-content:space-between;gap:12px;padding:6px 0;border-bottom:1px solid var(--line)}
.facts span{color:var(--muted)}
.lst .btn{margin:8px 0}
.nav a{font-size:14.5px}
@media (max-width:1100px){.grid5{grid-template-columns:repeat(3,1fr)}.nav{gap:14px}}
@media (max-width:900px){
  .hero-in,.two,.foot{grid-template-columns:1fr}
  .hero-in{padding:48px 20px}
  .grid4{grid-template-columns:repeat(2,1fr)}
  .grid3,.grid5{grid-template-columns:1fr 1fr}
  .cta-in{flex-direction:column;align-items:flex-start}
}
@media (max-width:640px){
  body{font-size:16px}
  .hero h1 br{display:none}
  .brand strong{font-size:16px}
  .menu-btn{display:block}
  .nav{display:none;position:absolute;left:0;right:0;top:68px;background:var(--paper);border-bottom:1px solid var(--line);flex-direction:column;align-items:flex-start;padding:16px 20px;gap:14px}
  .nav.open{display:flex}
  .grid4,.grid3,.grid5{grid-template-columns:1fr}
  .sec{padding:44px 0}
  .prose{font-size:17px}
  .sec-head{flex-direction:column;gap:4px}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}

/* ảnh Nha Trang */
.hero-photo{background:linear-gradient(180deg,rgba(8,57,92,.42),rgba(8,57,92,.62)),url(images/bai-tam.jpg) center/cover;border-bottom:none}
.hero-photo::after{display:none}
.hero-photo h1,.hero-photo .lead{color:#fff}
.hero-photo .eyebrow{color:#ffd58a}
.hero-photo .btn-ghost-dark{color:#fff!important;border-color:rgba(255,255,255,.7)}
.hero-photo .btn-ghost-dark:hover{background:#fff;color:var(--green-d)!important}
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.gallery figure{margin:0}
.gallery img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:var(--r);display:block;border:1px solid var(--line)}
.gallery figcaption{font-size:14px;color:var(--muted);margin-top:8px}
.zalo-band{background:linear-gradient(90deg,var(--green-d),var(--green));color:#fff}
.zb{display:flex;align-items:center;justify-content:space-between;gap:28px;padding:32px 20px}
.zb h2{color:#fff;font-size:24px;margin-bottom:6px}
.zb p{margin:0;color:#d6e9f5;max-width:60ch}
.copy a{color:#cfe0ec}
@media (max-width:1199px){.nav{display:none;position:absolute;left:0;right:0;top:68px;background:var(--paper);border-bottom:1px solid var(--line);flex-direction:column;align-items:flex-start;padding:16px 20px;gap:14px}.nav.open{display:flex}.menu-btn{display:block}}
@media (max-width:900px){.gallery{grid-template-columns:1fr}.zb{flex-direction:column;align-items:flex-start}}

.grp{font-size:20px;margin:34px 0 14px;color:var(--green-d);border-left:4px solid var(--gold);padding-left:12px}
.grp:first-child{margin-top:0}

.nav a{white-space:nowrap}
.nav{gap:16px}
.tbl.left td:last-child,.tbl.left th:last-child{text-align:left;white-space:normal}

@media (max-width:640px){.facts li{flex-direction:column;gap:2px}.facts strong{text-align:left}}

/* trình xem slide */
.viewer{max-width:1000px;margin:0 auto}
.stage{position:relative;background:#0b1620;border-radius:var(--r);overflow:hidden}
.stage img{display:block;width:100%;height:auto;aspect-ratio:16/9;object-fit:contain;background:#0b1620}
.nv{position:absolute;top:50%;transform:translateY(-50%);width:44px;height:44px;border-radius:50%;border:none;background:rgba(255,255,255,.85);color:var(--green-d);font-size:30px;line-height:1;cursor:pointer}
.nv.prev{left:12px}.nv.next{right:12px}
.vcap{margin:12px 0;font-size:16px}.vcap span{color:var(--muted);margin-right:8px}
.thumbs{display:grid;grid-template-columns:repeat(auto-fill,minmax(90px,1fr));gap:8px;margin-bottom:20px}
.th{padding:0;border:2px solid transparent;border-radius:8px;overflow:hidden;background:none;cursor:pointer}
.th img{display:block;width:100%;aspect-ratio:16/9;object-fit:cover}
.th.on{border-color:var(--earth)}

.lotimg{margin:0 0 28px}.lotimg img{width:100%;border-radius:var(--r);border:1px solid var(--line);display:block}
.lotimg figcaption{font-size:14px;color:var(--muted);margin-top:8px}
.tbl.lots table{font-size:15px}.tbl.lots td,.tbl.lots th{text-align:left;white-space:nowrap}
.tbl.lots td:last-child,.tbl.lots th:last-child{text-align:right}
.tbl.lots tr.tot td{font-weight:700;background:var(--green-l)}
.notes{padding-left:22px}.notes li{margin:8px 0}

.stack .why{margin-top:24px;max-width:560px}

.avatar-img{width:96px;height:96px;border-radius:50%;object-fit:cover;object-position:center 30%;margin:0 auto 12px;display:block;border:3px solid var(--gold)}
.portrait{width:100%;max-width:300px;aspect-ratio:1/1;object-fit:cover;border-radius:var(--r);margin:0 0 20px;display:block;border:1px solid var(--line)}