:root{
  --bg:#ffffff; --soft:#f3f7f8; --ink:#15222a; --ink2:#46555e; --ink3:#72818a; --line:#e1e8eb;
  --brand:#0b4f63; --brand2:#0e6a7f; --tint:#e5f2f5; --accent:#e8a23a; --cta:#0b4f63;
  --warn-bg:#fff5e8; --warn:#a4560c; --red-bg:#fdeceb; --red:#a8261b; --ok-bg:#e9f6ee; --ok:#1d7a3f;
  --r:14px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.75 "Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",sans-serif;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:var(--brand2)}
.wrap{max-width:1100px;margin:0 auto;padding:0 16px}
.narrow{max-width:760px}
h1,h2,h3{line-height:1.3;letter-spacing:-.01em;color:var(--ink)}
.small{font-size:.85rem}

/* header */
header.top{position:sticky;top:0;z-index:40;background:rgba(255,255,255,.97);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.bar{display:grid;grid-template-columns:auto 1fr auto;align-items:center;height:64px;gap:20px}
.menu{display:flex;gap:18px;font-size:.88rem;white-space:nowrap;justify-content:center;order:1}
.menu a,.mnav a{color:var(--ink2);text-decoration:none}
.menu a:hover{color:var(--brand)}
.brand{order:0;font-weight:800;font-size:1.05rem;color:var(--ink);text-decoration:none;white-space:nowrap}
.acts{order:2;display:flex;gap:12px;align-items:center;justify-content:flex-end}
.tel{color:var(--ink);text-decoration:none;font-size:.9rem;white-space:nowrap}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:10px 20px;border-radius:999px;background:var(--cta);color:#fff;font-weight:700;font-size:.92rem;text-decoration:none;border:1.5px solid var(--cta);white-space:nowrap;font-family:inherit;cursor:pointer}
.btn:hover{filter:brightness(1.1)}
.btn.ghost{background:#fff;color:var(--brand)}
.btn.light{background:#fff;color:var(--brand);border-color:#fff}
.btn.outline{background:transparent;color:#fff;border-color:rgba(255,255,255,.75)}
.burger{display:none;background:none;border:0;font-size:1.5rem;cursor:pointer;color:var(--ink)}
.mnav{display:none}
@media (max-width:1100px){.menu{display:none}.bar{grid-template-columns:auto 1fr}.brand{justify-self:start}.burger{display:block}.tel{display:none}
  body.open .mnav{display:flex;flex-direction:column;gap:4px;padding:8px 16px 16px;border-top:1px solid var(--line)}
  .mnav a{padding:10px 0;border-bottom:1px solid var(--line)}}
@media (max-width:420px){.acts .btn{display:none}}

/* hero */
.hero{background:linear-gradient(135deg,#0b4f63 0%,#0e6a7f 55%,#2b8a8f 100%);color:#fff;text-align:center;padding:72px 0 64px}
.hero h1{color:#fff;font-size:clamp(1.55rem,3.6vw,2.35rem);font-weight:800;margin:0 0 .6em}
.hero p{opacity:.92;margin:0 0 22px}
.btns{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}

/* list */
.list{max-width:960px;padding-top:36px;padding-bottom:24px}
.card{display:grid;grid-template-columns:260px 1fr;gap:28px;padding:28px 0;border-bottom:1px solid var(--line)}
.card .thumb{display:block;border-radius:10px;overflow:hidden;aspect-ratio:4/3;background:var(--soft)}
.card .thumb img{width:100%;height:100%;object-fit:cover;transition:transform .3s}
.card .thumb:hover img{transform:scale(1.03)}
.card .thumb.empty{display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--tint),#d3e9ee);text-decoration:none}
.card .thumb.empty span{font-weight:700;color:var(--brand);font-size:.9rem;padding:0 12px;text-align:center}
.card h2{font-size:1.25rem;margin:0 0 8px}
.card h2 a{color:var(--ink);text-decoration:none}
.card h2 a:hover{color:var(--brand)}
.card p{color:var(--ink2);margin:0 0 10px;font-size:.96rem;line-height:1.65}
.meta{color:var(--ink3);font-size:.82rem}
@media (max-width:680px){.card{grid-template-columns:1fr;gap:14px}.card .thumb{aspect-ratio:16/9}}
.promo{display:flex;gap:18px;align-items:center;justify-content:space-between;background:var(--tint);border-radius:var(--r);padding:18px 22px;margin-bottom:10px;font-size:.95rem}
@media (max-width:680px){.promo{flex-direction:column;align-items:flex-start}}
.cat-head{background:var(--soft);padding:44px 0 30px;border-bottom:1px solid var(--line)}
.cat-head h1{margin:0 0 .3em}
.cat-head p{color:var(--ink2);margin:0}
.empty-cat{color:var(--ink2);padding:30px 0}

/* post */
.post{padding-top:38px;padding-bottom:30px}
.crumb a{font-size:.8rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--brand2);text-decoration:none}
.post h1{font-size:clamp(1.6rem,3.6vw,2.2rem);margin:.3em 0 .35em}
.post .meta{margin-bottom:22px}
.cover{margin:0 0 22px}
.cover img{border-radius:12px;width:100%}
figure{margin:24px 0}
figure img{border-radius:10px}
figcaption{font-size:.82rem;color:var(--ink3);margin-top:6px}
.content h2{font-size:1.35rem;margin:1.8em 0 .5em}
.content h3{font-size:1.1rem;margin:1.4em 0 .4em}
.content p{margin:0 0 1em}
.content ul,.content ol{padding-left:1.2em;margin:0 0 1em}
.content li{margin-bottom:.35em}
.content hr{border:0;border-top:1px solid var(--line);margin:2em 0}
.tbl{overflow-x:auto;margin:0 0 1.2em;border:1px solid var(--line);border-radius:10px}
table{border-collapse:collapse;width:100%;font-size:.9rem;line-height:1.5}
th,td{padding:9px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
th{background:var(--tint);font-weight:700;white-space:nowrap}
tr:last-child td{border-bottom:0}
.callout{border-left:4px solid var(--brand2);background:var(--tint);border-radius:0 10px 10px 0;padding:14px 18px;margin:0 0 1.3em}
.callout p{margin:0 0 .5em}.callout p:last-child{margin:0}
.callout.ask{border-left-color:var(--accent);background:#fff8ec}
.callout.warn{border-left-color:var(--warn);background:var(--warn-bg)}
.callout.red{border-left-color:var(--red);background:var(--red-bg)}
.callout.ok{border-left-color:var(--ok);background:var(--ok-bg)}
.toc{background:var(--soft);border-radius:12px;padding:14px 18px;margin:0 0 1.5em;font-size:.92rem}
.toc ol{margin:.4em 0 0;padding-left:1.2em}
.toc a{color:var(--ink2);text-decoration:none}
.toc a:hover{color:var(--brand)}
.video{position:relative;aspect-ratio:16/9;border-radius:12px;overflow:hidden;margin:0 0 1.5em}
.video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.cta-box{background:linear-gradient(135deg,#0b4f63,#0e6a7f);color:#fff;border-radius:var(--r);padding:24px;margin:2em 0}
.cta-box h3{color:#fff;margin:0 0 .4em}
.cta-box p{opacity:.92;margin:0 0 14px;font-size:.95rem}
.cta-box .btns{justify-content:flex-start}
.cta-box .btn{background:#fff;color:var(--brand);border-color:#fff}
.cta-box .btn.ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.7)}
.related{padding-left:1.1em}
.related li{margin-bottom:.4em}
.intro-card{display:grid;grid-template-columns:200px 1fr;gap:22px;align-items:center;background:var(--soft);border-radius:var(--r);padding:20px;margin:10px 0 26px}
.intro-card img{border-radius:10px;aspect-ratio:1;object-fit:cover}
.intro-card h2{margin:0 0 .3em;color:var(--brand);font-size:1.15rem}
.intro-card p{margin:0;color:var(--ink2)}
@media (max-width:600px){.intro-card{grid-template-columns:1fr}.intro-card img{max-width:180px}}

/* follow + footer */
.follow{background:var(--soft);text-align:center;padding:52px 0;border-top:1px solid var(--line)}
.follow h2{margin:0 0 .4em}
.follow p{color:var(--ink2);margin:0 0 20px}
footer{padding:26px 0 90px;color:var(--ink3);font-size:.88rem;text-align:center}
footer p{margin:.3em 0}
footer a{color:var(--ink2)}
.mbar{display:none}
@media (max-width:680px){.mbar{display:flex;gap:8px;position:fixed;left:0;right:0;bottom:0;padding:10px 12px;background:#fff;border-top:1px solid var(--line);z-index:50}.mbar .btn{flex:1}}