/* giasu-toancap2 · Cô Thanh Loan · theo bản thiết kế 07/11/2026 */
:root{
  --green:#2C7A4B; --green-dark:#22603B; --green-soft:#E7F4EC;
  --blue:#1D5A9E;  --blue-dark:#164879;  --blue-soft:#E8F0FA; --blue-line:#B9CFEA;
  --ink:#17262F;   --muted:#4F5F69;      --line:#DCE5E3;
  --soft:#F4F8F7;  --footer:#0F2A44;     --error:#B3261E; --error-soft:#FCEDEC;
  --input-border:#C9D5D2; --placeholder-bg:#FFF4D6; --placeholder-fg:#6B5200;
  --font:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--font);color:var(--ink);background:#fff;-webkit-font-smoothing:antialiased;line-height:1.5}
img{max-width:100%;height:auto;display:block}
a{color:var(--blue-dark)}a:hover{color:var(--footer)}
a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #7FB0E6;outline-offset:2px}
input::placeholder,textarea::placeholder{color:#7A8A93}
svg{flex-shrink:0}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}
.skip{position:absolute;left:-999px;top:8px;z-index:100;background:#fff;padding:10px 14px;border-radius:8px}
.skip:focus{left:8px}
.wrap{max-width:1200px;margin:0 auto;padding:0 24px}
.narrow{max-width:760px}
.ph{background:var(--placeholder-bg);color:var(--placeholder-fg);padding:1px 6px;border-radius:4px;font-weight:500}

/* ---------- Header ---------- */
.site-header{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.97);border-bottom:1px solid var(--line)}
.site-header .wrap{min-height:76px;display:flex;flex-wrap:wrap;align-items:center;gap:12px 20px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink)}
.brand-logo{width:40px;height:40px;border-radius:10px;background:var(--blue);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:15px;position:relative}
.brand-logo::after{content:"";position:absolute;right:-3px;bottom:-3px;width:14px;height:14px;border-radius:7px;background:var(--green);border:2px solid #fff}
.brand-text{display:flex;flex-direction:column;line-height:1.2}
.brand-name{font-weight:700;font-size:16px}
.brand-sub{font-size:12.5px;color:var(--muted)}
.main-nav{display:flex;flex-wrap:wrap;gap:2px;margin-left:auto}
.main-nav a{display:inline-flex;align-items:center;min-height:44px;padding:0 14px;border-radius:8px;font-size:15.5px;font-weight:500;text-decoration:none;color:var(--ink)}
.main-nav a:hover{background:var(--soft)}
.main-nav a[aria-current="page"]{font-weight:600;color:var(--blue-dark);background:var(--blue-soft)}
.head-tel{display:inline-flex;align-items:center;gap:6px;min-height:44px;padding:0 12px;font-size:15px;font-weight:600;color:var(--blue-dark);text-decoration:none}
.head-mobile{display:none;margin-left:auto;gap:8px;align-items:center}
.icon-btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;min-height:44px;padding:0 12px;border-radius:10px;border:1.5px solid var(--line);background:#fff;color:var(--ink);font:600 14.5px var(--font);text-decoration:none;cursor:pointer}
.icon-btn.call{background:var(--green);border-color:var(--green);color:#fff}
.icon-btn.zalo{background:var(--blue-soft);border-color:var(--blue-line);color:var(--blue-dark)}
.mobile-menu{display:none;border-top:1px solid var(--line);background:#fff}
.mobile-menu nav{display:flex;flex-direction:column;padding:8px 20px 20px;gap:4px}
.mobile-menu nav a{display:flex;align-items:center;min-height:48px;padding:0 14px;border-radius:10px;font-size:16.5px;font-weight:500;text-decoration:none;color:var(--ink)}
.mobile-menu nav a[aria-current="page"]{background:var(--blue-soft);color:var(--blue-dark);font-weight:600}
.mobile-menu .btn{margin-top:8px}
.mobile-menu.open{display:block}

/* ---------- Buttons, tags ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:0 22px;border-radius:10px;border:1.5px solid var(--line);background:#fff;color:var(--ink);font:600 16px var(--font);text-decoration:none;white-space:nowrap;cursor:pointer}
.btn:hover{color:inherit;filter:brightness(.97)}
.btn-sm{min-height:44px;padding:0 18px;font-size:15px}
.btn-lg{min-height:52px}
.btn-green{background:var(--green);border-color:var(--green);color:#fff}
.btn-green:hover{background:var(--green-dark);border-color:var(--green-dark);color:#fff}
.btn-zalo{background:var(--blue-soft);border-color:var(--blue-line);color:var(--blue-dark)}
.btn-blue{background:var(--blue);border-color:var(--blue);color:#fff}
.btn-blue:hover{color:#fff;background:var(--blue-dark)}
.btn-block{width:100%}
.btn-row{display:flex;flex-wrap:wrap;gap:12px}
.tags{display:flex;flex-wrap:wrap;gap:8px}
.tag{display:inline-flex;align-items:center;gap:6px;padding:5px 11px;border-radius:999px;background:var(--blue-soft);color:var(--blue-dark);font-size:13.5px;font-weight:600;white-space:nowrap}
.tag-green{background:var(--green-soft);color:var(--green-dark)}

/* ---------- Sections ---------- */
.sec{padding:88px 0}
.sec-soft{background:var(--soft)}
.sec-head{display:flex;flex-direction:column;gap:12px;max-width:720px;margin:0 0 36px}
.eyebrow{font-size:13.5px;font-weight:600;letter-spacing:.06em;color:var(--green);text-transform:uppercase}
h1,h2,h3{margin:0;color:var(--ink)}
h1{font-size:54px;line-height:1.15;font-weight:700;letter-spacing:-.01em}
.page-hero h1{font-size:44px;line-height:1.2}
h2{font-size:36px;line-height:1.25;font-weight:700}
h3{font-size:21px;line-height:1.35}
.lead{margin:0;font-size:19px;line-height:1.6;color:var(--muted)}
.sub{margin:0;font-size:17.5px;line-height:1.6;color:var(--muted)}
.muted{color:var(--muted)}
p{margin:0}
.c-blue{color:var(--blue)}.c-green{color:var(--green)}

/* hero */
.hero{background:var(--soft);padding:64px 0 80px}
.hero-grid{display:flex;flex-wrap:wrap;gap:32px 56px;align-items:center}
.hero-text{flex:1 1 520px;display:flex;flex-direction:column;gap:24px}
.hero-media{flex:1 1 380px;min-width:0}
.facts{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.fact{display:flex;gap:10px;align-items:flex-start;padding:14px;border-radius:12px;background:#fff;border:1px solid var(--line)}
.fact svg{margin-top:2px}
.fact span{display:block}
.fact .k{font-size:13px;color:var(--muted)}
.fact .v{font-size:15.5px;font-weight:600}
.page-hero{background:var(--soft);padding:56px 0 60px}
.page-hero .inner{display:flex;flex-direction:column;gap:16px;max-width:760px}
.crumb{font-size:14px;color:var(--muted);display:flex;gap:8px;flex-wrap:wrap}
.crumb a{color:var(--blue-dark)}
.page-hero .lead{font-size:18px}

/* placeholder images */
.ph-img{border-radius:16px;background:var(--blue-soft);border:1.5px dashed var(--blue);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;padding:16px;text-align:center;min-height:220px}
.ph-img span{font-size:14px;font-weight:500;color:var(--muted)}
.ph-img.green{background:var(--green-soft);border-color:var(--green)}
.ph-img.tall{min-height:480px;border-radius:24px}
.ph-img.flat{border-radius:0;min-height:168px;border-width:0 0 1.5px}

/* cards */
.grid-2{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,420px),1fr));gap:24px}
.grid-3{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,300px),1fr));gap:24px}
.grid-4{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,240px),1fr));gap:20px}
.card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:28px;display:flex;flex-direction:column;gap:14px}
.card p{font-size:16px;line-height:1.6;color:var(--muted)}
.fix{display:flex;gap:10px;align-items:flex-start;padding:14px 16px;border-radius:12px;background:var(--green-soft);color:var(--green-dark);font-size:15.5px;font-weight:500;line-height:1.5}
.more{font-size:15px;font-weight:600;color:var(--blue-dark);display:inline-flex;gap:6px;align-items:center;min-height:32px}
.step{display:flex;flex-direction:column;gap:12px;padding:24px;background:#fff;border-radius:16px;border:1px solid var(--line)}
.step-top{display:flex;align-items:center;gap:12px}
.ico{width:44px;height:44px;border-radius:12px;background:var(--blue-soft);display:flex;align-items:center;justify-content:center}
.ico-lg{width:52px;height:52px;border-radius:14px}
.ico.green{background:var(--green-soft)}
.step-no{font-size:14px;font-weight:600;color:var(--muted)}
.step h3{font-size:19px}
.step p{font-size:15.5px;line-height:1.6;color:var(--muted)}
.course-head{display:flex;align-items:center;gap:14px}
.course-head h3{font-size:22px}
.course-head .lv{font-size:14.5px;color:var(--muted);display:block;margin-top:4px}
.card .desc{font-size:15.5px}
.rows > div{display:flex;gap:12px;align-items:flex-start;padding:12px 0;border-top:1px solid var(--line)}
.rows .rk{width:92px;flex-shrink:0;font-size:14.5px;color:var(--muted)}
.rows .rv{font-size:15.5px;font-weight:500}
.checks{margin:0;padding:0;list-style:none;display:flex;flex-direction:column;gap:10px}
.checks li{display:flex;gap:10px;align-items:flex-start;font-size:15.5px;line-height:1.55}
.proof-band{display:flex;flex-wrap:wrap;align-items:center;gap:16px 28px;padding:28px 36px;border-radius:16px;background:var(--blue-dark);color:#fff;margin-bottom:28px}
.proof-band .big{font-size:52px;font-weight:700;line-height:1}
.proof-band .txt{font-size:17px;line-height:1.5;color:#D6E2EE;flex:1 1 280px}
.proof{display:flex;flex-direction:column;gap:10px}
.proof .t{font-size:15px;font-weight:600}
.proof .s{font-size:14px;color:var(--muted)}
.post-card{text-decoration:none;color:var(--ink);background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden;display:flex;flex-direction:column}
.post-card:hover{color:var(--ink);box-shadow:0 4px 16px rgba(23,38,47,.08)}
.post-card .body{padding:20px;display:flex;flex-direction:column;gap:10px}
.post-card .meta{display:flex;align-items:center;gap:10px;flex-wrap:wrap;font-size:13.5px;color:var(--muted)}
.post-card h3{font-size:19px}
.post-card p{font-size:15px;line-height:1.6;color:var(--muted)}
.post-card .go{display:inline-flex;align-items:center;gap:6px;font-size:15px;font-weight:600;color:var(--blue-dark)}
.head-row{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:16px;margin-bottom:36px}
.head-row .sec-head{margin:0}
.cta-sec{padding:16px 0 96px}
.cta{background:var(--green-soft);border-radius:20px;padding:40px 44px;display:flex;flex-wrap:wrap;align-items:center;gap:24px}
.cta .t{flex:1 1 420px;display:flex;flex-direction:column;gap:8px}
.cta h2{font-size:28px;line-height:1.3;color:var(--green-dark)}
.cta p{font-size:16px;line-height:1.6}

/* table */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:14px}
table{width:100%;min-width:680px;border-collapse:collapse}
th{text-align:left;padding:14px 16px;font-size:14px;font-weight:600;color:var(--muted);background:var(--soft);border-bottom:1px solid var(--line)}
td{padding:14px 16px;font-size:15.5px;border-bottom:1px solid var(--line);vertical-align:top}
tr:last-child td{border-bottom:0}
td.b{font-weight:600}
.note{margin:14px 0 0;font-size:14.5px;color:var(--muted)}

/* FAQ */
.faq{display:flex;flex-direction:column;gap:12px;max-width:860px}
.faq-item{border:1px solid var(--line);border-radius:14px;background:#fff}
.faq-item h3{margin:0;font-size:17px}
.faq-btn{width:100%;min-height:60px;padding:16px 20px;display:flex;align-items:center;gap:16px;background:transparent;border:0;text-align:left;font:600 17px var(--font);color:var(--ink);cursor:pointer}
.faq-btn span:first-child{flex:1}
.faq-btn .chev{display:flex;color:var(--muted);transition:transform .2s}
.faq-btn[aria-expanded="true"] .chev{transform:rotate(180deg)}
.faq-ans{margin:0;padding:0 20px 20px;font-size:15.5px;line-height:1.65;color:var(--muted)}
.faq-ans[hidden]{display:none}

/* form */
.form-sec{background:var(--soft);padding:88px 0;scroll-margin-top:76px}
.form-grid{display:flex;flex-wrap:wrap;gap:32px 48px;align-items:flex-start}
.form-side{flex:1 1 300px;display:flex;flex-direction:column;gap:16px}
.form-side .sec-head{margin:0 0 20px}
.quick{display:flex;flex-direction:column;gap:12px;padding:20px;border-radius:14px;background:#fff;border:1px solid var(--line)}
.quick .t{font-size:15px;font-weight:600}
.form-box{flex:999 1 520px;min-width:0;background:#fff;border:1px solid var(--line);border-radius:20px;padding:36px;box-shadow:0 2px 10px rgba(23,38,47,.05)}
form.reg{display:flex;flex-direction:column;gap:22px}
.f2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.field{display:flex;flex-direction:column;gap:8px;border:0;margin:0;padding:0;min-width:0}
.field label,.field legend,.field .lbl{font-size:15px;font-weight:600;color:var(--ink);padding:0}
.field legend{margin-bottom:8px}
.opt{font-weight:400;color:var(--muted)}
.input{width:100%;min-height:50px;padding:12px 14px;border-radius:10px;border:1.5px solid var(--input-border);background:#fff;font:16px var(--font);color:var(--ink)}
textarea.input{resize:vertical}
.input[aria-invalid="true"]{border-color:var(--error)}
.choices{display:flex;flex-wrap:wrap;gap:8px}
.choice{min-height:46px;padding:0 16px;border-radius:10px;border:1.5px solid var(--input-border);background:#fff;color:var(--ink);font:600 15.5px var(--font);cursor:pointer}
.choice[aria-pressed="true"]{background:var(--blue);border-color:var(--blue);color:#fff}
.field.invalid .choice[aria-pressed="false"]{border-color:var(--error)}
.err{display:flex;gap:6px;align-items:center;font-size:14px;color:var(--error)}
.err:empty{display:none}
.err-sum{display:flex;gap:10px;align-items:flex-start;padding:14px 16px;border-radius:12px;background:var(--error-soft);color:var(--error);font-size:15px;line-height:1.5}
.err-sum[hidden],.fail[hidden]{display:none}
.agree{display:flex;gap:12px;align-items:flex-start;font-size:15px;line-height:1.5;cursor:pointer;font-weight:400 !important}
.agree input{width:22px;height:22px;margin:1px 0 0;accent-color:var(--green);flex-shrink:0}
.fail{display:flex;flex-direction:column;gap:12px;padding:16px 18px;border-radius:12px;background:var(--error-soft);border:1px solid #F1C5C1}
.fail .t{font-size:15.5px;font-weight:600;color:var(--error)}
.fail .s{font-size:15px;line-height:1.5}
.submit{min-height:54px;padding:0 28px;border-radius:12px;border:0;background:var(--green);color:#fff;font:700 17px var(--font);cursor:pointer;align-self:flex-start}
.submit:hover{background:var(--green-dark)}
.submit:disabled{opacity:.6;cursor:wait}
.form-note{font-size:14px;color:var(--muted)}
.hp{position:absolute;left:-5000px;width:1px;height:1px;overflow:hidden}

/* article */
.article{max-width:760px}
.article h2{font-size:28px;margin:40px 0 14px}
.article h3{font-size:21px;margin:28px 0 10px}
.article p,.article li{font-size:18px;line-height:1.7}
.article p{margin:0 0 16px}
.article ul,.article ol{margin:0 0 16px;padding-left:24px}
.article li{margin-bottom:8px}
.box{padding:20px 22px;border-radius:14px;background:var(--blue-soft);border:1px solid var(--blue-line);margin:24px 0}
.box.green{background:var(--green-soft);border-color:#BFE0CB}
.box p:last-child{margin:0}
.author{display:flex;gap:14px;align-items:center;padding:20px;border-radius:14px;border:1px solid var(--line);margin-top:36px}

.post{max-width:760px;margin:0 auto;padding:48px 24px 80px;display:flex;flex-direction:column;gap:22px}
.post h1{font-size:42px;line-height:1.25}
.post .meta{display:flex;gap:10px;align-items:center;flex-wrap:wrap;font-size:14px;color:var(--muted)}
.post h2{margin:16px 0 0;font-size:26px;line-height:1.35;scroll-margin-top:90px}
.post p,.post li{font-size:18px;line-height:1.8}
.post ul,.post ol{margin:0;padding-left:22px;display:flex;flex-direction:column;gap:10px}
.post .ph-img{min-height:380px}
.toc{padding:20px 22px;border-radius:14px;border:1px solid var(--line);background:var(--soft);display:flex;flex-direction:column;gap:6px}
.toc .h{font-size:14px;font-weight:600;color:var(--muted)}
.toc a{font-size:16px;color:var(--blue-dark);min-height:36px;display:flex;align-items:center}
.ex{padding:20px 22px;border-radius:14px;background:var(--blue-soft);border:1px solid #C8D9EE;display:flex;flex-direction:column;gap:10px}
.ex .h{font-size:14px;font-weight:600;color:var(--blue-dark)}
.ex .f{font-size:20px;font-weight:500;font-variant-numeric:tabular-nums}
.ex .s{font-size:15.5px;line-height:1.6;color:var(--muted)}
.ex.green{background:var(--green-soft);border-color:#C7E3D1}
.ex.green .h{color:var(--green-dark)}
.post-cta{display:flex;flex-direction:column;gap:14px;padding:24px;border-radius:16px;background:var(--green-soft);border:1px solid #C7E3D1}
.post-cta .t{font-size:18px;font-weight:600;line-height:1.45;color:var(--green-dark)}
@media (max-width:768px){.post{padding:28px 20px 56px}.post h1{font-size:30px}.post h2{font-size:22px}.post p,.post li{font-size:16.5px;line-height:1.75}.post .ph-img{min-height:220px}}

/* filter */
.filters{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:28px}
.filter{min-height:44px;padding:0 18px;border-radius:999px;border:1.5px solid var(--input-border);background:#fff;color:var(--ink);font:600 15px var(--font);cursor:pointer}
.filter[aria-pressed="true"]{background:var(--blue-dark);border-color:var(--blue-dark);color:#fff}
.empty{display:flex;flex-direction:column;align-items:center;gap:14px;padding:48px 24px;border:1.5px dashed var(--line);border-radius:16px;text-align:center}
.empty[hidden]{display:none}

/* footer */
.site-footer{background:var(--footer);color:#fff;padding:56px 0 40px}
.foot-grid{display:flex;flex-wrap:wrap;gap:36px 56px}
.foot-col{display:flex;flex-direction:column;gap:10px}
.foot-col.a{flex:1 1 300px}.foot-col.b{flex:1 1 200px}.foot-col.c{flex:1 1 260px}
.foot-name{font-weight:700;font-size:18px}
.foot-desc{color:#C3D3E3;font-size:15px;line-height:1.6}
.foot-h{font-weight:600;font-size:14px;color:#9FB6CC}
.site-footer a{color:#D6E2EE;text-decoration:none;font-size:15px;min-height:32px;display:inline-flex;align-items:center;gap:8px}
.site-footer a:hover{color:#fff;text-decoration:underline}
.foot-addr{display:flex;gap:8px;color:#D6E2EE;font-size:15px}
.foot-addr .ph2{color:#FFE7A3}
.foot-bottom{max-width:1200px;margin:36px auto 0;padding:20px 24px 0;border-top:1px solid #2A4763;display:flex;flex-wrap:wrap;gap:8px 24px;font-size:14px;color:#9FB6CC}
.foot-bottom a{text-decoration:underline}

/* floating */
.float{position:fixed;right:24px;bottom:24px;z-index:40;display:flex;flex-direction:column;align-items:flex-end;gap:10px}
.float a{display:inline-flex;align-items:center;gap:8px;min-height:48px;padding:0 18px 0 14px;border-radius:24px;font-weight:600;font-size:15px;text-decoration:none;box-shadow:0 4px 14px rgba(23,38,47,.18);color:#fff}
.float .z{background:var(--blue)}.float .g{background:var(--green)}
.float a:hover{color:#fff;filter:brightness(1.08)}

/* simple centered pages (cam on, 404) */
.center-page{padding:88px 0;background:var(--soft);min-height:60vh}
.center-box{max-width:640px;margin:0 auto;background:#fff;border:1px solid var(--line);border-radius:20px;padding:44px;display:flex;flex-direction:column;gap:18px;align-items:flex-start}
.ok-ico{width:60px;height:60px;border-radius:30px;background:var(--green);display:flex;align-items:center;justify-content:center}
.policy h2{font-size:24px;margin:32px 0 10px}
.policy p,.policy li{font-size:17px;line-height:1.7}
.policy ul{padding-left:22px}

/* ---------- Mobile ---------- */
@media (max-width:1080px){
  .main-nav,.head-tel,.head-cta{display:none}
  .head-mobile{display:flex}
}
@media (max-width:768px){
  .wrap{padding:0 20px}
  .site-header .wrap{min-height:64px;flex-wrap:nowrap;gap:10px}
  .brand{min-width:0}
  .brand-name{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .head-mobile{flex-shrink:0;gap:6px}
  .brand-sub{display:none}
  h1{font-size:34px}
  .page-hero h1{font-size:30px}
  h2{font-size:26px}
  .lead{font-size:17px}
  .sub{font-size:16px}
  .sec,.form-sec,.center-page{padding:56px 0}
  .hero{padding:36px 0 48px}
  .hero-text{gap:18px}
  .page-hero{padding:32px 0 36px}
  .ph-img.tall{min-height:300px}
  .card{padding:22px}
  .proof-band{padding:22px}
  .proof-band .big{font-size:40px}
  .cta{padding:28px 22px}
  .cta h2{font-size:23px}
  .cta-sec{padding:8px 0 72px}
  .form-box{padding:22px}
  .f2{grid-template-columns:1fr}
  .submit{align-self:stretch}
  .btn-row .btn{flex:1 1 100%}
  .btn{white-space:normal;text-align:center;max-width:100%}
  .article p,.article li{font-size:16.5px}
  .article h2{font-size:23px}
  .center-box{padding:28px 22px}
  .float{right:14px;bottom:14px}
  .float a{min-height:46px;padding:0 14px 0 12px}
  .site-footer{padding:44px 0 96px}
}
@media (max-width:380px){
  .facts{grid-template-columns:1fr}
  .icon-btn .lbl{display:none}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none !important}}