/* TN Repair: CSS thuần, không font ngoài, không framework. */
:root{
	--brand:#c8102e;--brand-dark:#9d0c24;--ink:#0f172a;--muted:#475569;
	--bg:#fff;--surface:#f8fafc;--line:#e2e8f0;--radius:12px;
	--font:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
	--shadow:0 1px 2px rgba(15,23,42,.06),0 4px 16px rgba(15,23,42,.06);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:80px}
body{margin:0;font-family:var(--font);font-size:17px;line-height:1.65;color:var(--ink);background:var(--bg)}
img,svg,video{max-width:100%;height:auto}
a{color:var(--brand);text-decoration-thickness:1px;text-underline-offset:2px}
a:hover{color:var(--brand-dark)}
h1,h2,h3{line-height:1.25;margin:0 0 .5em;letter-spacing:-.01em}
h1{font-size:clamp(1.9rem,4.5vw,2.8rem)}
h2{font-size:clamp(1.45rem,3vw,1.9rem)}
h3{font-size:1.15rem}
p{margin:0 0 1em}
ul,ol{padding-left:1.25em}
address{font-style:normal}
.sr-only,.skip-link:not(:focus){position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip-link:focus{position:fixed;top:8px;left:8px;z-index:100;background:#fff;padding:8px 14px;border-radius:8px;box-shadow:var(--shadow)}
:focus-visible{outline:3px solid #f59e0b;outline-offset:2px}
.container{width:min(1140px,100% - 32px);margin-inline:auto}
.narrow{max-width:760px;margin-inline:auto}
.center{text-align:center}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line)}
.site-header.scrolled{box-shadow:var(--shadow)}
.header-inner{display:flex;align-items:center;gap:16px;min-height:68px}
.brand{display:flex;align-items:center;text-decoration:none;color:var(--ink);font-weight:800;font-size:1.2rem}
.brand img{max-height:48px;width:auto}
.nav{margin-left:auto;display:flex;align-items:center;gap:20px}
.nav-list,.footer-menu{list-style:none;margin:0;padding:0;display:flex;gap:20px;flex-wrap:wrap}
.nav-list a{color:var(--ink);text-decoration:none;font-weight:600}
.nav-list a:hover{color:var(--brand)}
.nav-toggle{display:none;margin-left:auto;background:none;border:1px solid var(--line);border-radius:10px;padding:8px;color:var(--ink);cursor:pointer}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 18px;border-radius:999px;border:2px solid transparent;font:inherit;font-weight:700;text-decoration:none;cursor:pointer;line-height:1.2}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand-dark);color:#fff}
.btn-outline{background:#fff;color:var(--ink);border-color:var(--line)}
.btn-outline:hover{border-color:var(--brand);color:var(--brand)}
.btn-lg{padding:14px 24px;font-size:1.05rem}
.btn-block{display:flex;width:100%}

/* Hero */
.hero{background:linear-gradient(135deg,#fff5f6 0%,#fff 55%,#f1f5f9 100%);padding:clamp(32px,6vw,72px) 0}
.hero-inner{display:grid;grid-template-columns:1.3fr 1fr;gap:32px;align-items:center}
.lead{font-size:1.15rem;color:var(--muted)}
.hero-points{list-style:none;padding:0;margin:0 0 24px;display:grid;gap:6px}
.hero-points li{padding-left:28px;position:relative;font-weight:600}
.hero-points li::before{content:"";position:absolute;left:0;top:.45em;width:16px;height:16px;border-radius:50%;background:var(--brand) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M4 8.5l2.5 2.5L12 5.5' fill='none' stroke='%23fff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/100% no-repeat}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap}
.hero-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.hero-card dl{margin:0 0 16px}
.hero-card dt{font-size:.8rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);font-weight:700}
.hero-card dd{margin:0 0 12px;font-weight:600}

/* Sections */
.section{padding:clamp(36px,6vw,72px) 0}
.section-alt{background:var(--surface)}
.section-title{text-align:center;margin-bottom:1.2em}
.section-title.left{text-align:left}
.grid{display:grid;gap:20px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.card .ico{color:var(--brand);margin-bottom:8px}
.card p:last-child{margin-bottom:0}
.steps{list-style:none;counter-reset:s;padding:0;display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.steps li{counter-increment:s;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;position:relative}
.steps li::before{content:counter(s);display:grid;place-items:center;width:34px;height:34px;border-radius:50%;background:var(--brand);color:#fff;font-weight:800;margin-bottom:10px}

/* Cards bài viết */
.post-card{display:flex;flex-direction:column;padding:0;overflow:hidden}
.post-card h3,.post-card .meta,.post-card p{padding-inline:20px}
.post-card h3{margin-top:16px}
.post-card h3 a{color:var(--ink);text-decoration:none}
.post-card h3 a:hover{color:var(--brand)}
.post-card p:last-child{padding-bottom:20px}
.card-thumb{display:block;aspect-ratio:16/9;background:var(--surface)}
.card-thumb img{width:100%;height:100%;object-fit:cover;display:block}
.meta{color:var(--muted);font-size:.9rem}

/* FAQ */
.faq details{background:#fff;border:1px solid var(--line);border-radius:var(--radius);margin-bottom:10px;padding:0 18px}
.faq summary{cursor:pointer;font-weight:700;padding:14px 0;list-style:none;position:relative;padding-right:28px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:0;top:12px;font-size:1.4rem;line-height:1;color:var(--brand)}
.faq details[open] summary::after{content:"\2212"}
.faq details p{margin:0 0 14px;color:var(--muted)}

/* Form */
.contact-grid{display:grid;grid-template-columns:1.3fr 1fr;gap:36px;align-items:start}
.form{display:grid;gap:14px;margin-top:12px}
.form label{display:grid;gap:6px;font-weight:600}
.form input,.form textarea,.search-form input{font:inherit;padding:12px 14px;border:1px solid #cbd5e1;border-radius:10px;width:100%;background:#fff;color:var(--ink)}
.form input:focus,.form textarea:focus,.search-form input:focus{border-color:var(--brand);outline:2px solid rgba(200,16,46,.2)}
.hp{position:absolute!important;left:-9999px!important;opacity:0}
.form-status{min-height:1.4em;margin:0;font-weight:600}
.form-status.ok{color:#15803d}
.form-status.err{color:#b91c1c}
.contact-info{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.search-form{display:flex;gap:10px;max-width:420px;margin:16px auto}

/* Bài viết */
.breadcrumbs{font-size:.9rem;color:var(--muted);margin-bottom:18px}
.breadcrumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;margin:0;padding:0}
.breadcrumbs li+li::before{content:"/";margin-right:6px;color:#94a3b8}
.breadcrumbs a{color:var(--muted)}
.archive-head{margin-bottom:28px}
.archive-desc{color:var(--muted)}
.entry-head h1{margin-bottom:.3em}
.entry-thumb{margin:0 0 20px}
.entry-thumb img{width:100%;border-radius:var(--radius);display:block}
.tldr{background:#fff7ed;border-left:4px solid #f59e0b;padding:14px 18px;border-radius:8px;margin:0 0 22px}
.toc{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:14px 20px;margin:0 0 24px}
.toc ol{margin:8px 0 0}
.entry-content h2{margin-top:1.8em}
.entry-content h3{margin-top:1.4em}
.entry-content table{border-collapse:collapse;width:100%;display:block;overflow-x:auto}
.entry-content th,.entry-content td{border:1px solid var(--line);padding:8px 12px;text-align:left}
.entry-content th{background:var(--surface)}
.entry-content img{border-radius:8px}
.cta-box{display:flex;flex-wrap:wrap;align-items:center;gap:12px;background:#fff5f6;border:1px solid #fecdd3;border-radius:var(--radius);padding:18px 20px;margin:32px 0}
.cta-box p{flex:1 1 260px;margin:0}
.related{margin-top:40px}
.pagination{margin-top:32px}
.nav-links{display:flex;gap:8px;flex-wrap:wrap;justify-content:center}
.page-numbers{padding:8px 14px;border:1px solid var(--line);border-radius:8px;text-decoration:none;color:var(--ink)}
.page-numbers.current{background:var(--brand);color:#fff;border-color:var(--brand)}
.comments{margin-top:40px}
.comment-list{list-style:none;padding:0}
.comment-body{border:1px solid var(--line);border-radius:var(--radius);padding:14px 16px;margin-bottom:12px}

/* Footer */
.site-footer{background:#0f172a;color:#cbd5e1;padding:44px 0 90px;margin-top:0}
.site-footer a{color:#fff}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:28px}
.footer-brand{font-size:1.2rem;font-weight:800;color:#fff}
.footer-title{font-weight:700;color:#fff;margin-bottom:.6em}
.site-footer ul{list-style:none;padding:0;margin:0}
.site-footer li{margin-bottom:6px}
.footer-copy{margin-top:28px;padding-top:18px;border-top:1px solid #1e293b;font-size:.9rem}

/* Thanh gọi nhanh (mobile) */
.callbar{display:none}

/* Chat */
.chat{position:fixed;right:16px;bottom:16px;z-index:60;font-size:15px}
.chat-toggle{display:flex;align-items:center;gap:8px;background:var(--brand);color:#fff;border:0;border-radius:999px;padding:12px 18px;font:inherit;font-weight:700;cursor:pointer;box-shadow:var(--shadow)}
.chat-toggle:hover{background:var(--brand-dark)}
.chat-panel{position:absolute;right:0;bottom:56px;width:min(370px,calc(100vw - 32px));height:min(540px,calc(100vh - 110px));display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:0 12px 40px rgba(15,23,42,.25);overflow:hidden}
.chat-panel[hidden]{display:none}
.chat-head{display:flex;justify-content:space-between;align-items:center;background:var(--brand);color:#fff;padding:12px 16px}
.chat-close{background:none;border:0;color:#fff;font-size:1.6rem;line-height:1;cursor:pointer}
.chat-log{flex:1;overflow-y:auto;padding:14px;display:flex;flex-direction:column;gap:10px;background:var(--surface)}
.msg{max-width:86%;padding:9px 13px;border-radius:14px;white-space:pre-wrap;word-wrap:break-word;line-height:1.5}
.msg.assistant{background:#fff;border:1px solid var(--line);align-self:flex-start;border-bottom-left-radius:4px}
.msg.user{background:var(--brand);color:#fff;align-self:flex-end;border-bottom-right-radius:4px}
.msg.user a{color:#fff}
.msg.typing{color:var(--muted);font-style:italic}
.chat-chips{display:flex;flex-wrap:wrap;gap:6px;padding:8px 12px 0}
.chat-chips:empty{display:none}
.chat-chips button{background:#fff;border:1px solid var(--line);border-radius:999px;padding:6px 12px;font:inherit;font-size:13px;cursor:pointer}
.chat-chips button:hover{border-color:var(--brand);color:var(--brand)}
.chat-form{display:flex;gap:8px;padding:10px 12px}
.chat-form input{flex:1;font:inherit;padding:10px 12px;border:1px solid #cbd5e1;border-radius:10px;min-width:0}
.chat-form button{background:var(--brand);color:#fff;border:0;border-radius:10px;padding:0 16px;font:inherit;font-weight:700;cursor:pointer}
.chat-form button:disabled{opacity:.6;cursor:wait}
.chat-note{margin:0;padding:0 12px 10px;font-size:12px;color:var(--muted)}

/* Responsive */
@media (max-width:900px){
	.hero-inner,.contact-grid{grid-template-columns:1fr}
	.grid-3,.steps{grid-template-columns:repeat(2,1fr)}
	.footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:720px){
	body{font-size:16px}
	.nav-toggle{display:inline-flex}
	.nav{display:none;position:absolute;left:0;right:0;top:100%;flex-direction:column;align-items:stretch;gap:12px;background:#fff;border-bottom:1px solid var(--line);padding:16px}
	.nav.open{display:flex}
	.nav-list{flex-direction:column;gap:12px}
	.nav-call{display:none}
	.grid-3,.steps,.footer-grid{grid-template-columns:1fr}
	.callbar{display:grid;grid-template-columns:repeat(3,1fr);position:fixed;left:0;right:0;bottom:0;z-index:55;background:#fff;border-top:1px solid var(--line)}
	.callbar a{padding:13px 8px;text-align:center;font-weight:700;text-decoration:none;color:var(--ink)}
	.callbar-call{background:var(--brand);color:#fff!important}
	.chat{bottom:68px}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}