/* Blog Hoàng Hà — hoangmanhha.vn. Màu đồng bộ hoanghabds.vn */
:root{
  --green:#0f4c3a; --green-2:#176b52; --gold:#c9a24b; --gold-soft:#f6efdd; --red:#a61e1e;
  --ink:#1c2420; --muted:#5b6661; --line:#e3e7e4; --bg:#fff; --bg-2:#f5f7f5;
  --serif:"Lora",Georgia,"Times New Roman",serif; --sans:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  --r:14px;
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{scroll-behavior:smooth;scroll-padding-top:76px}
body{margin:0;font-family:var(--sans);color:var(--ink);background:var(--bg);line-height:1.6;font-size:16px;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
.wrap{max-width:1140px;margin:0 auto;padding-inline:16px}
h1,h2,h3{font-family:var(--serif);line-height:1.25;margin:0 0 .4em;text-wrap:balance}
.chip{display:inline-block;font-size:.74rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--red)}
.meta{font-size:.85rem;color:var(--muted)}
.sr{position:absolute;left:-9999px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:10px 18px;border-radius:999px;font-weight:600;font-size:.92rem;white-space:nowrap;border:0;font-family:inherit;cursor:pointer}
.btn-gold{background:var(--gold);color:#1c1606}
.btn-green{background:var(--green);color:#fff}
.btn-line{border:1.5px solid var(--green);color:var(--green);background:#fff}
.btn-zalo{background:#0068ff;color:#fff}
.btn:focus-visible,a:focus-visible,button:focus-visible{outline:2px solid var(--gold);outline-offset:2px}

/* Menu */
.nav{position:sticky;top:0;z-index:40;background:rgba(255,255,255,.97);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;gap:20px;height:64px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--green)}
.logo-mark{width:38px;height:38px;border-radius:10px;background:linear-gradient(145deg,#c0392b,#8e1b1b);color:#f3d27a;display:grid;place-items:center;font-weight:700;letter-spacing:-.04em;box-shadow:inset 0 0 0 1.5px rgba(243,210,122,.55)}
.logo small{display:block;font-weight:500;font-size:.72rem;color:var(--muted);line-height:1.2}
.menu{display:flex;gap:16px;margin-left:auto;font-size:.92rem;font-weight:500;white-space:nowrap;align-items:center}
.menu a:hover,.dd-btn:hover{color:var(--green-2)}
.menu a.on{color:var(--green);font-weight:700}
.dd{position:relative}
.dd-btn{font:inherit;font-weight:500;background:none;border:0;cursor:pointer;color:var(--ink);padding:0}
.dd-list{display:none;position:absolute;top:100%;left:-14px;padding-top:12px;min-width:200px}
.dd-list::before{content:"";position:absolute;inset:12px 0 0;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:0 14px 30px -12px rgba(0,0,0,.2);z-index:-1}
.dd-list a{display:block;padding:9px 16px}
.dd:hover .dd-list,.dd:focus-within .dd-list,.dd.open .dd-list{display:block}
.burger{display:none;background:none;border:0;padding:8px;cursor:pointer}
.burger span{display:block;width:22px;height:2px;background:var(--ink);margin:5px 0}
@media (max-width:1180px) and (min-width:901px){.logo small{display:none}.menu{gap:12px;font-size:.88rem}.nav .wrap{gap:14px}.nav .btn{padding:9px 14px;font-size:.86rem}}
@media (max-width:900px){
  .menu{display:none;position:absolute;top:64px;left:0;right:0;flex-direction:column;align-items:stretch;gap:0;background:#fff;border-bottom:1px solid var(--line);margin:0;max-height:calc(100vh - 64px);overflow:auto}
  .menu.open{display:flex}
  .menu>a,.dd-btn{display:block;width:100%;text-align:left;padding:11px 16px;border-top:1px solid var(--line)}
  .dd-list{position:static;display:block;padding:0 0 6px 14px;min-width:0}
  .dd-list::before{display:none}
  .dd-list a{padding:7px 16px;color:var(--muted)}
  .burger{display:block}
  .nav .btn{margin-left:auto;padding:9px 14px;font-size:.86rem}
}
@media (max-width:400px){.logo small{display:none}}

/* Mở đầu */
.intro{background:linear-gradient(180deg,var(--bg-2),#fff);padding-block:40px 24px}
.intro .wrap{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,.7fr);gap:40px;align-items:center}
.intro h1{font-size:clamp(1.8rem,3.6vw,2.8rem);margin-top:8px}
.intro p{color:var(--muted);font-size:1.05rem;max-width:60ch;margin:0 0 18px}
.intro img{border-radius:18px;width:100%;aspect-ratio:4/5;object-fit:cover;object-position:50% 30%;max-height:440px;box-shadow:0 24px 50px -24px rgba(15,76,58,.45)}
.istats{display:flex;flex-wrap:wrap;gap:10px 28px;list-style:none;padding:0;margin:0 0 22px;font-size:.88rem;color:var(--muted)}
.istats b{display:block;font-family:var(--serif);font-size:1.35rem;color:var(--green)}
.irow{display:flex;gap:10px;flex-wrap:wrap}
@media (max-width:760px){.intro .wrap{grid-template-columns:minmax(0,1fr);gap:20px}.intro img{order:-1;aspect-ratio:4/3;max-height:none}}

/* Bài nổi bật */
.top{padding-block:32px 8px}
.top .wrap{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(0,1fr);gap:32px}
.sec-title{font-size:.8rem;letter-spacing:.08em;text-transform:uppercase;color:var(--green);font-weight:700;margin:0 0 12px}
.feat img{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:var(--r)}
.feat h2{font-size:clamp(1.4rem,2.6vw,2rem);margin-top:12px}
.feat p{color:var(--muted);margin:0 0 8px}
.feat:hover h2{color:var(--green-2)}
.popular{border-left:1px solid var(--line);padding-left:28px}
.popular ol{list-style:none;margin:0;padding:0;counter-reset:n}
.popular li{counter-increment:n;display:grid;grid-template-columns:34px 1fr;gap:6px;padding:14px 0;border-top:1px solid var(--line)}
.popular li::before{content:counter(n);font-family:var(--serif);font-size:1.6rem;font-weight:700;color:var(--gold);line-height:1}
.popular h3{font-size:1rem;margin:0 0 4px}
.popular a:hover h3{color:var(--green-2)}
@media (max-width:860px){.top .wrap{grid-template-columns:minmax(0,1fr)}.popular{border-left:0;padding-left:0}}

/* 2 cổng */
.gates{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;padding-block:28px 0}
.gate{display:flex;gap:16px;align-items:center;padding:20px;border-radius:var(--r);border:1px solid var(--line);background:var(--bg-2)}
.gate b{display:block;font-family:var(--serif);font-size:1.15rem;color:var(--green)}
.gate span{color:var(--muted);font-size:.92rem}
.gate i{font-style:normal;font-size:1.8rem}
.gate:hover{border-color:var(--gold)}
@media (max-width:700px){.gates{grid-template-columns:minmax(0,1fr)}}

/* Lưới bài */
.cats{display:flex;gap:8px;flex-wrap:wrap;padding-block:28px 8px}
.cats a{font-size:.9rem;border:1px solid var(--line);background:#fff;border-radius:999px;padding:7px 15px}
.cats a.on{background:var(--green);border-color:var(--green);color:#fff}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:28px 24px;padding-block:16px 48px}
.card img{width:100%;aspect-ratio:3/2;object-fit:cover;border-radius:12px;background:var(--bg-2)}
.card h3{font-size:1.12rem;margin:10px 0 6px}
.card p{color:var(--muted);font-size:.93rem;margin:0 0 6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card:hover h3{color:var(--green-2)}
.empty{grid-column:1/-1;background:var(--bg-2);border-radius:var(--r);padding:28px;text-align:center;color:var(--muted)}
@media (max-width:900px){.grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:560px){.grid{grid-template-columns:minmax(0,1fr)}}

/* Trang chuyên mục */
.phead{background:var(--green);color:#fff;padding-block:36px}
.phead h1{color:#fff;font-size:clamp(1.7rem,3.4vw,2.4rem)}
.phead p{color:rgba(255,255,255,.8);margin:0;max-width:62ch}
.phead .chip{color:var(--gold)}

/* Video */
.videos{background:var(--bg-2);padding-block:40px}
.vgrid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin-top:16px}
.vbox{position:relative;aspect-ratio:16/9;border-radius:var(--r);overflow:hidden;background:#000;cursor:pointer;border:0;padding:0;width:100%;display:block}
.vbox img{width:100%;height:100%;object-fit:cover;opacity:.92}
.vbox .play{position:absolute;inset:0;margin:auto;width:68px;height:48px;border-radius:14px;background:#ff0000;display:grid;place-items:center}
.vbox .play::after{content:"";border-style:solid;border-width:10px 0 10px 17px;border-color:transparent transparent transparent #fff;margin-left:4px}
.vbox iframe{width:100%;height:100%;border:0;display:block}
.vtitle{font-weight:600;margin:10px 0 0;font-size:.98rem}
@media (max-width:860px){.vgrid{grid-template-columns:minmax(0,1fr)}}

/* Tiện ích */
.tools{padding-block:44px}
.tgrid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-top:16px}
.tool{border:1px solid var(--line);border-radius:var(--r);padding:20px;display:block}
a.tool:hover{border-color:var(--gold)}
.tool i{font-style:normal;font-size:1.6rem}
.tool h3{font-size:1.08rem;margin:8px 0 4px}
.tool p{margin:0;color:var(--muted);font-size:.92rem}
.soon{font-size:.75rem;font-weight:700;color:var(--gold);text-transform:uppercase;letter-spacing:.06em}
@media (max-width:760px){.tgrid{grid-template-columns:minmax(0,1fr)}}
.calc{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:24px;background:var(--bg-2);border-radius:var(--r);padding:24px;margin:16px 0 36px}
.calc label{display:block;font-size:.88rem;font-weight:500;margin:10px 0 4px}
.calc input,.calc select{width:100%;font:inherit;padding:11px 14px;border:1px solid #cdd4d0;border-radius:10px;background:#fff}
.res{background:#fff;border-radius:12px;padding:18px}
.res div{display:flex;justify-content:space-between;gap:12px;padding:9px 0;border-top:1px solid var(--line);font-variant-numeric:tabular-nums}
.res div:first-child{border-top:0}
.res b{color:var(--green);font-size:1.1rem}
.disc{font-size:.82rem;color:var(--muted);margin-top:10px}
@media (max-width:760px){.calc{grid-template-columns:minmax(0,1fr)}}

/* Form 3 tab */
.signup{background:var(--bg-2);padding-block:48px}
.signup .wrap{display:grid;grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);gap:40px}
.signup ul{list-style:none;padding:0;margin:14px 0 0}
.signup li{padding:6px 0 6px 28px;position:relative}
.signup li::before{content:"✓";position:absolute;left:0;top:6px;width:20px;height:20px;border-radius:50%;background:var(--gold);color:#1c1606;font-size:.72rem;display:grid;place-items:center;font-weight:700}
.fbox{background:#fff;border-radius:16px;padding:6px 22px 22px;box-shadow:0 10px 30px -18px rgba(0,0,0,.25)}
.tabs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));border-bottom:1px solid var(--line);margin:0 -22px 18px}
.tab{background:none;border:0;padding:14px 6px;font:inherit;font-weight:600;font-size:.9rem;color:var(--muted);cursor:pointer;border-bottom:3px solid transparent}
.tab[aria-selected="true"]{color:var(--green);border-bottom-color:var(--gold)}
.f{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.f label{display:block;font-size:.85rem;font-weight:500;margin-bottom:4px}
.f input,.f select{width:100%;font:inherit;padding:11px 14px;border:1px solid #cdd4d0;border-radius:10px;background:#fff;color:var(--ink)}
.f .full{grid-column:1/-1}
.f button{grid-column:1/-1;padding:13px;margin-top:4px}
.msg{grid-column:1/-1;font-size:.93rem;border-radius:10px;padding:0}
.msg.ok{background:#e6f4ee;color:var(--green);padding:12px}
.msg.err{background:#fdecea;color:#8a1c12;padding:12px}
.hp{position:absolute;left:-9999px}
@media (max-width:860px){.signup .wrap{grid-template-columns:minmax(0,1fr)}.f{grid-template-columns:minmax(0,1fr)}.tab{font-size:.8rem}}

/* Tác giả */
.author{padding-block:44px}
.abox{display:flex;gap:18px;align-items:center;background:var(--bg-2);border-radius:var(--r);padding:20px}
.abox img{width:96px;height:96px;border-radius:50%;object-fit:cover;object-position:50% 25%;flex:none}
.abox p{margin:0;color:var(--muted);font-size:.93rem}

/* Bài viết */
.crumb{font-size:.85rem;color:var(--muted);padding-block:20px 6px}.crumb a{color:var(--green-2)}
.layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:48px;padding-bottom:56px}
.post h1{font-size:clamp(1.7rem,3.6vw,2.5rem);margin-top:6px}
.byline{display:flex;align-items:center;gap:10px;margin:8px 0 20px}
.byline img{width:40px;height:40px;border-radius:50%;object-fit:cover;object-position:50% 25%}
.cover{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:var(--r)}
.body{max-width:68ch;font-size:1.06rem;margin-top:20px}
.body h2{font-size:1.4rem;margin-top:1.6em;color:var(--green)}
.body h3{font-size:1.15rem;margin-top:1.3em}
.body p{margin:0 0 1em}
.body ul,.body ol{padding-left:22px;margin:0 0 1em}
.body li{margin:4px 0}
.body a{color:var(--green-2);text-decoration:underline}
.body figure{margin:1.4em 0}.body figure img{border-radius:12px}
.body figcaption{font-size:.86rem;color:var(--muted);margin-top:6px}
.body blockquote{margin:1.5em 0;padding:16px 20px;border-top:2px solid var(--gold);border-bottom:2px solid var(--gold);background:var(--gold-soft);border-radius:10px;font-style:italic;font-weight:600;color:var(--green);text-align:center}
.toc{background:var(--bg-2);border-radius:var(--r);padding:16px 20px;margin:0 0 24px;font-size:.98rem}
.toc b{font-size:.8rem;letter-spacing:.08em;text-transform:uppercase;color:var(--green)}
.toc ol{margin:8px 0 0;padding-left:20px}.toc li{margin:3px 0}.toc a{text-decoration:none;color:var(--ink)}.toc a:hover{color:var(--green-2)}
.cta{background:var(--green);color:#fff;border-radius:var(--r);padding:22px;margin:32px 0}
.cta h3{color:#fff;margin-bottom:6px}.cta p{color:rgba(255,255,255,.82);margin:0 0 14px}
.cta .row{display:flex;gap:10px;flex-wrap:wrap}
aside .box{position:sticky;top:84px;display:grid;gap:18px}
.side{border:1px solid var(--line);border-radius:var(--r);padding:18px}
.side h3{font-family:var(--sans);font-size:.8rem;letter-spacing:.08em;text-transform:uppercase;color:var(--green)}
.side>a{display:block;padding:10px 0;border-top:1px solid var(--line);font-weight:600;font-size:.95rem}
.side>a:hover{color:var(--green-2)}
.side.form{background:var(--gold-soft);border-color:#eadfc0}
.side .f{grid-template-columns:minmax(0,1fr);gap:8px}
@media (max-width:900px){.layout{grid-template-columns:minmax(0,1fr)}aside .box{position:static}}
.related{background:var(--bg-2);padding-block:36px 48px}

/* Giới thiệu */
.about{padding-block:40px}
.about .wrap{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,.8fr);gap:40px;align-items:start}
.about .body{margin-top:0}
.about figure{margin:0 0 16px}.about figure img{border-radius:var(--r)}
.quote{margin:24px 0;padding:18px 20px;border-top:2px solid var(--gold);border-bottom:2px solid var(--gold);background:var(--gold-soft);border-radius:10px;font-style:italic;font-weight:600;color:var(--green);text-align:center;font-family:var(--serif);font-size:1.15rem}
@media (max-width:860px){.about .wrap{grid-template-columns:minmax(0,1fr)}}

footer{background:#0b2f25;color:rgba(255,255,255,.78);padding-block:36px 96px;font-size:.9rem}
footer .wrap{display:grid;grid-template-columns:minmax(0,1.4fr) repeat(2,minmax(0,1fr));gap:28px}
footer h4{color:#fff;margin:0 0 10px;font-size:.95rem}
footer a{display:block;padding:3px 0}footer a:hover{color:var(--gold)}
footer .copy{grid-column:1/-1;border-top:1px solid rgba(255,255,255,.12);padding-top:14px;font-size:.82rem}
@media (max-width:760px){footer .wrap{grid-template-columns:minmax(0,1fr)}}
.float{position:fixed;right:16px;bottom:calc(16px + env(safe-area-inset-bottom,0px));display:flex;flex-direction:column;gap:10px;z-index:50}
.float a{width:52px;height:52px;border-radius:50%;display:grid;place-items:center;color:#fff;font-weight:700;font-size:.78rem;box-shadow:0 8px 22px -6px rgba(0,0,0,.35)}
.float .z{background:#0068ff}.float .c{background:#e53935}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}