:root{--bg:#0b1015;--surface:#121a21;--surface-2:#18232b;--text:#eef3f5;--muted:#a9b6bd;--line:#2a3942;--accent:#e3b35a;--accent-2:#d86c4e;--max:1180px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,Segoe UI,Arial,sans-serif;line-height:1.65}a{color:inherit;text-decoration:none}img{display:block;max-width:100%}.skip{position:absolute;left:-999px}.skip:focus{left:1rem;top:1rem;background:#fff;color:#000;padding:.5rem;z-index:9}.site-header{position:sticky;top:0;z-index:5;background:rgba(11,16,21,.94);border-bottom:1px solid var(--line);backdrop-filter:blur(12px)}.nav{max-width:var(--max);margin:auto;min-height:72px;display:flex;align-items:center;gap:1rem;padding:.75rem 1rem}.brand{display:inline-flex;align-items:center;gap:.6rem;font-weight:800;letter-spacing:.08em;color:var(--accent);white-space:nowrap;font-size:1.15rem}.brand-mark{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#1a0f08;font-weight:900;font-size:1.05rem;box-shadow:0 4px 12px rgba(227,179,90,.25);transition:transform .2s,box-shadow .2s}.brand:hover .brand-mark{transform:rotate(-6deg) scale(1.06);box-shadow:0 6px 18px rgba(227,179,90,.4)}.brand-text{display:inline-flex;align-items:baseline;gap:.4rem;color:var(--text)}.brand-sub{font-size:.7rem;font-weight:500;color:var(--muted);letter-spacing:.04em}.nav-toggle{display:none}.nav-links{display:flex;gap:.2rem;align-items:center;margin-left:auto}.nav-links a{font-size:.82rem;color:var(--muted);padding:.55rem .55rem;border-bottom:2px solid transparent}.nav-links a:hover,.nav-links a.active{color:var(--text);border-color:var(--accent)}.nav-actions{display:flex;gap:.5rem}.button{display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--accent);color:var(--bg);background:var(--accent);font-weight:700;padding:.65rem 1rem;border-radius:4px;cursor:pointer}.button.secondary{color:var(--text);background:transparent;border-color:var(--line)}.button:hover{filter:brightness(1.08)}.container{max-width:var(--max);margin:auto;padding:0 1rem}.hero{min-height:560px;display:grid;align-items:center;position:relative;overflow:hidden;background:#111;padding:4rem 0}.hero:before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(8,12,16,.95) 0%,rgba(8,12,16,.78) 55%,rgba(8,12,16,.35) 100%),url('/image/hero-r88-vietnam.webp') center/cover no-repeat;z-index:0}.hero-grid{position:relative;z-index:1;display:grid;grid-template-columns:1.1fr .9fr;gap:3rem;align-items:center;width:100%;max-width:var(--max);margin:0 auto;padding:0 1rem}.hero-content{position:relative;max-width:640px;text-align:left}.eyebrow{color:var(--accent);font-size:.78rem;font-weight:800;letter-spacing:.14em;text-transform:uppercase}.hero h1,.page-hero h1{font-size:clamp(2.2rem,5vw,4.2rem);line-height:1.08;margin:.8rem 0 1rem;letter-spacing:-.01em;text-align:left}.hero p{font-size:1.1rem;color:#d5dfe2;max-width:600px;text-align:left}.actions{display:flex;gap:.75rem;flex-wrap:wrap;margin-top:1.5rem;justify-content:flex-start}.notice{border-left:3px solid var(--accent);padding:.75rem 1rem;background:rgba(227,179,90,.08);color:#d8e1e3;font-size:.9rem;text-align:left;margin:1.2rem 0 0}.hero-side{position:relative;display:flex;justify-content:flex-end;align-items:center}.hero-card{background:rgba(255,255,255,.05);backdrop-filter:blur(14px);border:1px solid rgba(255,255,255,.1);border-radius:18px;padding:1.5rem;max-width:380px;width:100%;box-shadow:0 24px 60px rgba(0,0,0,.4)}.hero-card h4{color:var(--accent);font-size:.85rem;letter-spacing:.12em;text-transform:uppercase;margin:0 0 .8rem}.hero-card ul{list-style:none;padding:0;margin:0}.hero-card li{padding:.55rem 0;border-bottom:1px dashed rgba(255,255,255,.12);color:#e3e8ea;font-size:.92rem;display:flex;justify-content:space-between;gap:1rem}.hero-card li:last-child{border-bottom:none}.hero-card li strong{color:var(--accent);font-weight:600;white-space:nowrap}.section{padding:4rem 0}.section-head{display:flex;justify-content:space-between;gap:2rem;align-items:end;margin-bottom:1.5rem}.section h2{font-size:2rem;line-height:1.15;margin:0}.section-intro{color:var(--muted);max-width:680px;margin:.7rem 0 0}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem}.grid.four{grid-template-columns:repeat(4,1fr)}.card{background:var(--surface);border:1px solid var(--line);border-radius:6px;overflow:hidden}.card-media{aspect-ratio:16/9;object-fit:cover;width:100%}.card-body{padding:1.2rem}.card h3{margin:0 0 .4rem;font-size:1.1rem}.card p{color:var(--muted);margin:.35rem 0 1rem;font-size:.93rem}.text-link{color:var(--accent);font-weight:700;font-size:.9rem}.band{background:var(--surface);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.split{display:grid;grid-template-columns:1fr 1fr;gap:2rem;align-items:center}.split img{width:100%;aspect-ratio:3/2;object-fit:cover;border-radius:6px}.checklist{padding:0;list-style:none}.checklist li{padding:.65rem 0 .65rem 1.6rem;border-bottom:1px solid var(--line);position:relative}.checklist li:before{content:"✓";position:absolute;left:0;color:var(--accent);font-weight:800}.page-hero{padding:5rem 0 3rem;background:var(--surface);border-bottom:1px solid var(--line)}.page-hero h1{font-size:clamp(2rem,5vw,3.6rem);max-width:850px}.page-hero p{color:var(--muted);max-width:760px;font-size:1.05rem}.breadcrumbs{color:var(--muted);font-size:.83rem;margin-bottom:1.2rem}.breadcrumbs a{color:var(--accent)}.article{max-width:850px}.article h2{margin-top:2.4rem}.article h3{margin-top:1.5rem}.article p,.article li{color:#c6d1d5}.article ul{padding-left:1.2rem}.article-media{width:100%;max-height:450px;object-fit:cover;border-radius:6px;margin:1.5rem 0}.faq{border-top:1px solid var(--line)}details{border-bottom:1px solid var(--line);padding:1rem 0}summary{cursor:pointer;font-weight:700}details p{color:var(--muted);max-width:760px}.table-wrap{overflow-x:auto}table{width:100%;border-collapse:collapse;background:var(--surface)}th,td{text-align:left;padding:.85rem;border:1px solid var(--line);vertical-align:top}th{color:var(--accent);font-size:.85rem}.footer{background:#070a0d;border-top:1px solid var(--line);padding:3rem 0 1.5rem;color:var(--muted)}.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:2rem}.footer h3{color:var(--text);font-size:1rem}.footer a{display:block;margin:.4rem 0;font-size:.9rem}.footer a:hover{color:var(--accent)}.legal{border-top:1px solid var(--line);margin-top:2rem;padding-top:1rem;font-size:.78rem}.empty-image{background:var(--surface-2);aspect-ratio:16/9;display:grid;place-items:center;color:var(--muted)}@media(max-width:980px){.nav-toggle{display:block;margin-left:auto;background:none;border:1px solid var(--line);color:var(--text);padding:.45rem .7rem}.nav-links{display:none;position:absolute;left:0;right:0;top:72px;background:var(--bg);padding:1rem;flex-direction:column;align-items:stretch;border-bottom:1px solid var(--line)}.nav-links.open{display:flex}.nav-actions{display:none}.grid,.grid.four{grid-template-columns:repeat(2,1fr)}.footer-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:620px){.hero{min-height:auto;padding:2rem 0}.hero-grid{grid-template-columns:1fr;gap:1.5rem}.hero-card{max-width:100%}.hero-content,.hero h1,.hero p,.actions,.notice{text-align:left}.actions{display:flex}}@media(min-width:621px) and (max-width:980px){.hero-grid{grid-template-columns:1fr;gap:1.5rem}.hero-side{justify-content:flex-start}}

/* ============ Article page styles ============ */
.article-hero{padding:5rem 0 2rem;background:linear-gradient(180deg,var(--surface) 0%,var(--bg) 100%);border-bottom:1px solid var(--line)}.article-hero-grid{display:grid;grid-template-columns:1.2fr 1fr;gap:3rem;align-items:center}.article-hero h1{font-size:clamp(1.8rem,4vw,3rem);line-height:1.15;margin:.5rem 0 1rem}.article-lead{font-size:1.1rem;color:#d5dfe2;max-width:680px;margin:0 0 1.5rem}.article-meta{display:flex;align-items:center;gap:.6rem;color:var(--muted);font-size:.85rem}.article-meta-dot{opacity:.4}.article-tags{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:1rem}.tag{display:inline-block;padding:.35rem .8rem;background:rgba(227,179,90,.1);border:1px solid rgba(227,179,90,.3);color:var(--accent);border-radius:999px;font-size:.8rem;font-weight:600;transition:.2s}.tag:hover{background:rgba(227,179,90,.2);transform:translateY(-1px)}.article-hero-cover img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:14px;box-shadow:0 20px 50px rgba(0,0,0,.4);border:1px solid var(--line)}
.article-progress{position:sticky;top:72px;height:3px;background:transparent;z-index:4}.article-progress-bar{height:100%;background:linear-gradient(90deg,var(--accent),var(--accent-2));width:0;transition:width .1s ease-out}
.article-layout{display:grid;grid-template-columns:1fr 320px;gap:3rem;max-width:1180px;margin:0 auto;padding:0 1rem}.article-body{min-width:0}.article-body h2{font-size:1.6rem;margin-top:2.4rem;color:var(--text);position:relative;padding-left:1rem}.article-body h2:before{content:"";position:absolute;left:0;top:.4rem;bottom:.4rem;width:4px;background:linear-gradient(180deg,var(--accent),var(--accent-2));border-radius:2px}.article-body p{font-size:1.02rem;line-height:1.75;color:#cdd7da;margin:1rem 0}.article-body ul{padding-left:1.4rem}.article-body li{padding:.4rem 0;color:#cdd7da}
.article-figure{margin:2rem 0;border-radius:10px;overflow:hidden;border:1px solid var(--line)}.article-figure img{width:100%;aspect-ratio:16/9;object-fit:cover;display:block}
.callout{margin:1.5rem 0;padding:1.1rem 1.3rem;background:linear-gradient(135deg,rgba(227,179,90,.12),rgba(216,108,78,.06));border-left:4px solid var(--accent);border-radius:6px;color:#e3e8ea;font-size:.96rem;line-height:1.6}.callout strong{color:var(--accent)}
.article-share{display:flex;align-items:center;gap:.6rem;flex-wrap:wrap;padding:1.5rem 0;margin-top:2rem;border-top:1px solid var(--line);color:var(--muted);font-size:.9rem}.article-share a{display:inline-block;padding:.5rem 1rem;background:var(--surface-2);border:1px solid var(--line);border-radius:6px;font-size:.85rem;color:var(--text);transition:.2s}.article-share a:hover{background:var(--accent);color:var(--bg);border-color:var(--accent)}
.article-sidebar{position:sticky;top:90px;align-self:start;display:flex;flex-direction:column;gap:1.5rem;max-height:calc(100vh - 100px);overflow-y:auto;padding-right:.5rem}.article-sidebar::-webkit-scrollbar{width:6px}.article-sidebar::-webkit-scrollbar-thumb{background:var(--line);border-radius:3px}
.sidebar-card{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:1.2rem}.sidebar-card h3{font-size:1rem;margin:0 0 .9rem;color:var(--accent);text-transform:uppercase;letter-spacing:.08em;font-weight:700}
.toc{list-style:none;padding:0;margin:0}.toc li{padding:.5rem 0;border-bottom:1px dashed var(--line)}.toc li:last-child{border-bottom:none}.toc a{font-size:.88rem;color:var(--muted);transition:.2s;display:block}.toc a:hover{color:var(--accent);padding-left:4px}
.related-grid{display:grid;grid-template-columns:1fr;gap:.75rem}.related-card{margin:0}.related-card .card-body{padding:.9rem}.related-card h3{font-size:.92rem;margin:0 0 .5rem;line-height:1.3}.related-card img{aspect-ratio:16/9}
.support-list{list-style:none;padding:0;margin:0}.support-list li{padding:.45rem 0;color:var(--text);font-size:.88rem;border-bottom:1px dashed var(--line)}.support-list li:last-child{border-bottom:none}
@media(max-width:980px){.article-hero-grid{grid-template-columns:1fr;gap:1.5rem}.article-hero-cover img{aspect-ratio:16/9}.article-layout{grid-template-columns:1fr;gap:2rem}.article-sidebar{position:static;max-height:none;order:-1}}
@media(max-width:620px){.article-hero{padding:3rem 0 1.5rem}.article-hero h1{font-size:1.6rem}.article-body h2{font-size:1.3rem;margin-top:1.8rem}.article-progress{top:64px}.article-tags{gap:.35rem}.tag{padding:.3rem .6rem;font-size:.72rem}}