/* voquocloc.vn bản 7: nền trắng sạch, một cột rõ ràng. Chủ ý một giao diện sáng duy nhất. */
:root{
  --bg:#FFFFFF; --soft:#F6F7F9; --ink:#16324A; --text:#2B3640; --muted:#66727C; --line:#E6E8EC;
  --accent:#B4472E; --accent-dark:#963A25;
  --font:"Be Vietnam Pro",-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;
  --wide:72rem; --gutter:clamp(16px,4vw,32px);
  color-scheme:light;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font);font-size:1.0625rem;line-height:1.7;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:inherit}
h1,h2,h3{color:var(--ink);margin:0;line-height:1.25;text-wrap:balance}
h1{font-size:clamp(2rem,1.4rem + 2.6vw,3.2rem);font-weight:800;letter-spacing:-.01em}
h2{font-size:clamp(1.6rem,1.25rem + 1.4vw,2.2rem);font-weight:800}
h3{font-size:1.15rem;font-weight:700}
p{margin:0}
.wrap{max-width:var(--wide);margin-inline:auto;padding-inline:var(--gutter)}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}

.kicker{font-size:.8rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--accent)}
.lead{font-size:clamp(1.05rem,1rem + .3vw,1.2rem);color:var(--text)}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 24px;border-radius:10px;font:inherit;font-weight:700;font-size:1rem;text-decoration:none;border:1.5px solid transparent;cursor:pointer;transition:background-color .15s ease,transform .15s ease}
.btn:hover{transform:translateY(-1px)}
.btn-main{background:var(--accent);color:#fff}
.btn-main:hover{background:var(--accent-dark)}
.btn-line{background:#fff;border-color:var(--ink);color:var(--ink)}
.btn-white{background:#fff;color:var(--ink)}
.btn-sm{min-height:40px;padding:0 18px;font-size:.92rem}
.ctas{display:flex;flex-wrap:wrap;gap:12px}
.center{display:flex;justify-content:center;margin-top:36px}

/* đầu trang */
.top{position:sticky;top:env(safe-area-inset-top,0px);z-index:10;background:rgba(255,255,255,.94);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.top-in{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:68px}
.logo{display:block;width:176px;max-width:44vw}
.logo svg{display:block;width:100%;height:auto}
.lg-ink{fill:var(--ink)} .lg-son{fill:var(--accent)}
.menu{display:flex;align-items:center;gap:22px;font-size:.95rem;font-weight:600}
.menu a:not(.btn){text-decoration:none;color:var(--muted)}
.menu a:not(.btn):hover,.menu a[aria-current="page"]{color:var(--ink)}
@media (max-width:640px){.menu{gap:14px;font-size:.88rem}.menu a[href="index.html"]{display:none}}

/* màn đầu */
.hero{padding-block:clamp(40px,7vw,88px)}
.hero-in{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,.8fr);gap:clamp(28px,6vw,72px);align-items:center}
.hero-text{display:grid;gap:20px;min-width:0}
.hero-photo{position:relative;margin:0;justify-self:center;width:min(100%,380px)}
.hero-photo img{border-radius:18px;aspect-ratio:4/5;object-fit:cover;width:100%;box-shadow:0 24px 50px -28px rgba(22,50,74,.45)}
@media (max-width:820px){.hero-in{grid-template-columns:1fr}.hero-photo{order:-1;width:min(70%,300px)}}

/* dải bằng chứng */
.proof{border-block:1px solid var(--line);background:var(--soft)}
.proof-in{display:grid;grid-template-columns:repeat(4,minmax(0,1fr))}
.pf{display:grid;gap:4px;padding:24px 20px;border-left:1px solid var(--line);min-width:0}
.pf:first-child{border-left:0}
.pf b{font-size:clamp(1.5rem,1.2rem + 1vw,2rem);font-weight:800;color:var(--ink);line-height:1.15}
.pf span{font-size:.92rem;color:var(--muted);line-height:1.5}
@media (max-width:820px){.proof-in{grid-template-columns:repeat(2,minmax(0,1fr))}.pf:nth-child(3){border-left:0}.pf:nth-child(n+3){border-top:1px solid var(--line)}}

/* khối */
.sec{padding-block:clamp(56px,8vw,96px)}
.sec-soft{background:var(--soft)}
.head{display:grid;gap:10px;margin-bottom:32px}
.two{display:grid;grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);gap:clamp(24px,5vw,64px)}
.two h2{margin-top:10px}
@media (max-width:760px){.two{grid-template-columns:1fr}}
.prose{display:grid;gap:16px;min-width:0;max-width:40rem}
.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
@media (max-width:860px){.cards{grid-template-columns:1fr}}
.card{display:grid;gap:10px;align-content:start;padding:24px;background:#fff;border:1px solid var(--line);border-radius:14px;min-width:0}
.card p{font-size:.97rem;color:var(--muted)}
.card-plain{border-top:3px solid var(--accent)}
.tag{justify-self:start;font-size:.75rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;padding:3px 10px;border-radius:999px;background:var(--soft);color:var(--muted);border:1px solid var(--line)}
.tag-on{background:#FBEDE8;color:var(--accent);border-color:#F1CFC4}

.cta-band{background:var(--ink);color:#fff}
.cta-in{display:grid;justify-items:center;gap:14px;text-align:center;padding-block:clamp(48px,7vw,80px)}
.cta-band h2{color:#fff}
.cta-band p{color:#C9D3DB}

/* blog */
.page-head{padding-block:clamp(44px,6vw,72px) clamp(20px,3vw,32px);border-bottom:1px solid var(--line)}
.page-head .wrap{display:grid;gap:12px}
.page-head .lead{max-width:42rem;color:var(--muted)}
.posts{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
@media (max-width:760px){.posts{grid-template-columns:1fr}}
.post{display:grid;gap:10px;align-content:start;padding:24px;border:1px solid var(--line);border-radius:14px;text-decoration:none;min-width:0;transition:border-color .15s ease}
.post:hover{border-color:var(--ink)}
.post h3{font-size:1.25rem}
.post p{color:var(--muted);font-size:.97rem}
.meta{font-size:.78rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--accent)}
.more{font-weight:700;color:var(--ink);font-size:.95rem}

/* bài viết */
.narrow{max-width:calc(42rem + 2*var(--gutter));display:grid;gap:16px}
.article h1{font-size:clamp(1.8rem,1.3rem + 2vw,2.6rem)}
.back{font-size:.92rem;font-weight:600;color:var(--muted);text-decoration:none}
.article .prose{max-width:none;font-size:1.08rem;line-height:1.85}
.article .lede{font-size:1.2rem;color:var(--ink);font-weight:500}
.article .prose h3{font-size:1.3rem;margin-top:12px}
.article .aside{padding:16px 20px;border-left:3px solid var(--accent);background:var(--soft);border-radius:0 12px 12px 0;display:grid;gap:6px}
.article .aside .k{font-size:.75rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--accent)}
.article .fine{font-size:.88rem;color:var(--muted);padding-top:12px;border-top:1px solid var(--line)}
.author{display:flex;flex-wrap:wrap;align-items:center;gap:14px;margin-top:20px;padding:18px;border:1px solid var(--line);border-radius:14px}
.author img{width:64px;height:64px;border-radius:50%;object-fit:cover;object-position:top}
.author div{display:grid;flex:1 1 12rem}
.author b{color:var(--ink)}
.author span{font-size:.92rem;color:var(--accent);font-weight:600}

/* liên hệ */
.contact{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:18px;align-items:start}
@media (max-width:820px){.contact{grid-template-columns:1fr}}
.contact-card{gap:16px;padding:28px}
.mail span{font-weight:700;font-size:clamp(1.05rem,.95rem + .8vw,1.35rem);color:var(--ink);user-select:all;overflow-wrap:anywhere}
.sign{display:grid;gap:2px;font-weight:700;color:var(--ink);padding-top:14px;border-top:1px solid var(--line)}
.sign span{font-weight:600;font-size:.92rem;color:var(--accent)}
.contact-list{display:grid;gap:12px}
.link-card{text-decoration:none;gap:4px}
.link-card:hover{border-color:var(--ink)}
.link-card b{color:var(--ink)}
.link-card span:last-child{font-size:.92rem;color:var(--muted)}

/* chân trang */
.foot{border-top:1px solid var(--line);padding-block:32px 24px}
.foot-in{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px}
.foot-brand{display:grid;gap:6px}
.foot-brand .logo{width:150px}
.foot-brand p{font-size:.82rem;font-weight:600;letter-spacing:.06em;color:var(--muted)}
.foot-links{display:flex;flex-wrap:wrap;gap:8px 22px;font-size:.92rem;font-weight:600}
.foot-links a{text-decoration:none;color:var(--muted)}
.foot-links a:hover{color:var(--ink)}
.fine{margin-top:18px;font-size:.82rem;color:var(--muted)}
.menu a{white-space:nowrap}
@media (max-width:640px){.logo{width:132px}.top-in{gap:10px}.menu .btn-sm{padding:0 12px;min-height:36px}}
@media (max-width:360px){.menu a[href="blog.html"]{display:none}}
/* câu chuyện Về tôi */
.story-in{max-width:calc(40rem + 2*var(--gutter));display:grid;gap:18px;font-size:1.08rem;line-height:1.85}
.story h2{margin-bottom:4px}
.story-lead{font-size:1.25rem;line-height:1.7;color:var(--ink);font-weight:500}
.turn{margin:10px 0;padding:22px 26px;border-left:4px solid var(--accent);background:var(--soft);border-radius:0 14px 14px 0;display:grid;gap:8px}
.turn p{font-size:1.3rem;line-height:1.55;font-weight:700;color:var(--ink)}
.turn cite{font-style:normal;font-size:.9rem;font-weight:600;color:var(--accent)}
.story .ctas{margin-top:8px}
/* ô chữ nổi dưới ảnh chân dung */
.photo-tag{position:absolute;left:-22px;bottom:28px;display:flex;align-items:flex-start;gap:10px;background:#fff;border:1px solid var(--line);border-left:4px solid var(--accent);border-radius:12px;padding:12px 20px 12px 14px;box-shadow:0 18px 40px -22px rgba(22,50,74,.5);white-space:nowrap}
.photo-tag .q{font-size:2.4rem;line-height:1;font-weight:800;color:var(--accent);margin-top:-4px}
.photo-tag .t{display:grid;gap:2px;font-size:1.08rem;font-weight:700;color:var(--ink);line-height:1.3}
.photo-tag small{font-size:.7rem;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
@media (max-width:820px){.photo-tag{left:-12px;bottom:16px;padding:10px 16px 10px 12px}.photo-tag .t{font-size:1rem}}
.br-dt{display:none}
@media (max-width:820px){.br-dt{display:inline}}