/* Giao diện dùng chung cho các trang trong /blog/ – cùng bảng màu và font với trang chủ */
:root{
  --ink:#1c1b19;--ink-2:#2a2826;--paper:#f7f3ec;--paper-2:#efe8dc;--white:#fffdf9;
  --text:#2b2926;--muted:#6b655c;--line:#ddd3c3;--accent:#b8672a;--gold:#e3a857;
  --radius:14px;--serif:'Fraunces',Georgia,serif;
  --sans:'Be Vietnam Pro',system-ui,-apple-system,'Segoe UI',sans-serif;--max:1180px;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:var(--sans);color:var(--text);background:var(--paper);line-height:1.7;font-size:16.5px;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}
.narrow{max-width:740px}
h1,h2,h3{font-family:var(--serif);font-weight:600;line-height:1.2;letter-spacing:-.01em}
.eyebrow{font-size:.78rem;font-weight:600;letter-spacing:.18em;text-transform:uppercase;color:var(--gold);display:flex;align-items:center;gap:10px;margin-bottom:14px}
.eyebrow::before{content:"";width:28px;height:1.5px;background:currentColor}

/* NAV */
.nav{background:var(--ink);position:sticky;top:0;z-index:50}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:68px;gap:16px}
.logo{font-family:var(--serif);font-size:1.2rem;color:#fff;text-decoration:none;font-weight:600;white-space:nowrap}
.logo span{color:var(--gold)}
.menu{display:flex;gap:24px;list-style:none;align-items:center}
.menu a{color:rgba(255,255,255,.8);text-decoration:none;font-size:.92rem;font-weight:500;white-space:nowrap}
.menu a:hover,.menu a[aria-current]{color:var(--gold)}
.menu .cta{color:var(--ink);background:var(--gold);padding:8px 18px;border-radius:999px}
@media (max-width:640px){.menu li.hide-m{display:none}.menu{gap:14px}.logo{font-size:1.02rem}.menu a{font-size:.86rem}.menu .cta{padding:7px 14px}}

/* ĐẦU TRANG */
.page-head{background:var(--ink);color:#fff;padding:72px 0 64px}
.page-head h1{font-size:clamp(2.2rem,5vw,3.4rem);margin-bottom:14px;max-width:20ch}
.page-head p{color:rgba(255,255,255,.72);max-width:62ch;font-size:1.05rem}

/* NÚT */
.btn{display:inline-flex;align-items:center;gap:10px;padding:13px 24px;border-radius:999px;font-weight:600;font-size:.95rem;text-decoration:none;transition:transform .2s,background .2s}
.btn:hover{transform:translateY(-2px)}
.btn-gold{background:var(--gold);color:var(--ink)}
.btn-dark{background:var(--ink);color:#fff}
.btn-dark:hover{background:var(--accent)}
.btn-line{border:1.5px solid var(--line);color:var(--ink)}
.btn-line:hover{border-color:var(--accent);color:var(--accent)}

/* DANH SÁCH BÀI */
main{padding:56px 0 88px}
.blog-filter{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:32px}
.blog-filter button{font:inherit;font-size:.9rem;font-weight:500;padding:8px 16px;border-radius:999px;border:1px solid var(--line);background:var(--white);color:var(--text);cursor:pointer}
.blog-filter button[aria-pressed="true"]{background:var(--ink);color:#fff;border-color:var(--ink)}
.art-list{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.article-card{display:block;text-decoration:none;background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:26px 26px 22px;transition:border-color .2s,transform .2s,box-shadow .2s}
a.article-card:hover{border-color:var(--accent);transform:translateY(-3px);box-shadow:0 18px 40px rgba(60,40,20,.08)}
.article-card.is-soon{border-style:dashed;background:transparent}
.article-card h3{font-size:1.3rem;margin:10px 0 8px;color:var(--ink)}
.article-card p{font-size:.93rem;color:var(--muted);margin-bottom:14px;line-height:1.6}
.art-tag{display:inline-block;font-size:.72rem;font-weight:600;letter-spacing:.1em;text-transform:uppercase;background:var(--paper-2);color:var(--accent);padding:5px 11px;border-radius:999px}
.art-meta{font-size:.82rem;color:var(--muted);font-weight:500}
.art-empty{color:var(--muted)}
@media (max-width:640px){.art-list{grid-template-columns:1fr}}

/* KHỐI THEO DÕI / LIÊN HỆ */
.follow{margin-top:56px;background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:32px;display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap}
.follow h2{font-size:1.5rem;margin-bottom:6px}
.follow p{color:var(--muted);max-width:52ch}
.follow .btns{display:flex;gap:12px;flex-wrap:wrap}

/* BÀI VIẾT */
.article-head{background:var(--ink);color:#fff;padding:64px 0 56px}
.back{display:inline-block;color:rgba(255,255,255,.65);text-decoration:none;font-size:.9rem;margin-bottom:22px}
.back:hover{color:var(--gold)}
.article-head .art-tag{background:rgba(227,168,87,.16);color:var(--gold)}
.article-head h1{font-size:clamp(2rem,4.6vw,3rem);margin:16px 0 14px}
.article-head .art-meta{color:rgba(255,255,255,.6)}
.article-body{padding:48px 0 24px;font-size:1.06rem}
.article-body .lede{font-family:var(--serif);font-size:1.35rem;line-height:1.5;color:var(--ink);margin-bottom:28px}
.article-body h2{font-size:1.65rem;margin:40px 0 14px;color:var(--ink)}
.article-body h3{font-size:1.25rem;margin:28px 0 10px;color:var(--ink)}
.article-body p{margin-bottom:18px}
.article-body ul,.article-body ol{margin:0 0 18px 22px}
.article-body li{margin-bottom:8px}
.article-body blockquote{font-family:var(--serif);font-size:1.3rem;line-height:1.5;color:var(--ink);border-left:3px solid var(--accent);padding-left:20px;margin:28px 0}
.article-body figure{margin:28px 0}
.article-body figure img{border-radius:var(--radius)}
.article-body figcaption{font-size:.85rem;color:var(--muted);margin-top:8px}
.why{background:var(--paper-2);border-radius:var(--radius);padding:22px 24px;margin:28px 0}
.why b{display:block;font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);margin-bottom:6px}
.why p:last-child{margin-bottom:0}
.author{display:flex;gap:20px;align-items:center;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:26px 0;margin:36px 0}
.author img{width:76px;height:76px;border-radius:50%;object-fit:cover;object-position:top;flex:none}
.author b{font-family:var(--serif);font-size:1.15rem;color:var(--ink)}
.author p{font-size:.93rem;color:var(--muted);margin:2px 0 0}
.related h2{font-size:1.4rem;margin:44px 0 18px}

footer{background:var(--ink);color:rgba(255,255,255,.55);padding:28px 0;font-size:.88rem}
footer .wrap{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
footer a{text-decoration:none}