:root{
  /* Token chung lấy từ /theme.css — trang chỉ giữ biến RIÊNG của blog */
  --paper:#fff; --ink-soft:#3f3a33; --ink-mute:#807870;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--f-body);background:var(--navy-900);color:var(--navy-200);line-height:1.7;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:var(--wrap);margin-inline:auto;padding-inline:clamp(20px,5vw,40px)}
h1,h2,h3,.display{font-family:var(--f-serif);color:#fff;line-height:1.14;letter-spacing:-.01em}
em{font-style:normal;color:var(--o-400)}

/* nav */
header{position:sticky;top:0;z-index:50;background:rgba(10,10,36,.82);backdrop-filter:blur(14px);border-bottom:1px solid rgba(136,136,192,.12)}
.nav{display:flex;align-items:center;justify-content:space-between;padding-block:16px}
.brand{display:flex;align-items:center;gap:11px}
.brand img{height:30px;width:auto}
.brand b{font-family:var(--f-display);color:#fff;font-weight:700;letter-spacing:.02em;font-size:1rem}
.nav-links{display:flex;gap:26px;align-items:center;font-size:.92rem;font-weight:500}
.nav-links a{color:var(--navy-200);transition:color .2s}
.nav-links a:hover,.nav-links a.active{color:#fff}
.btn{border:0;display:inline-flex;align-items:center;gap:8px;font-family:var(--f-display);font-weight:700;font-size:.88rem;padding:11px 20px;border-radius:999px;white-space:nowrap;transition:transform .25s var(--ease),background .25s}
.btn-primary{background:var(--o-500);color:#fff;box-shadow:0 10px 28px -8px rgba(201,96,40,.55)}
.btn-primary:hover{transform:translateY(-2px);background:var(--o-400)}

/* register tags */
.tag{display:inline-flex;align-items:center;gap:6px;font-family:var(--f-display);font-size:.7rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;padding:5px 11px;border-radius:999px}
.tag-sage{color:var(--o-300);background:rgba(201,96,40,.13);border:1px solid rgba(217,117,56,.35)}
.tag-sci{color:#9cc0ec;background:rgba(53,53,144,.28);border:1px solid rgba(136,136,192,.35)}

/* blog index hero */
.blog-hero{padding:78px 0 26px;text-align:center;position:relative;isolation:isolate}
.blog-hero::before{content:"";position:absolute;inset:0 0 auto;height:340px;z-index:-1;background:radial-gradient(60% 100% at 50% 0,rgba(201,96,40,.16),transparent 70%)}
.blog-hero .kicker{font-family:var(--f-display);font-weight:700;font-size:.78rem;letter-spacing:.22em;text-transform:uppercase;color:var(--o-400)}
.blog-hero h1{font-size:clamp(2.2rem,5.5vw,3.6rem);font-weight:700;margin:16px 0 12px}
.blog-hero p{color:var(--navy-200);max-width:52ch;margin-inline:auto;font-size:1.05rem}

/* post cards */
.posts{display:grid;grid-template-columns:repeat(auto-fill,minmax(330px,1fr));gap:24px;padding-block:34px 90px}
.card{display:flex;flex-direction:column;align-items:flex-start;background:linear-gradient(180deg,rgba(36,36,106,.3),rgba(18,18,58,.3));border:1px solid rgba(136,136,192,.16);border-radius:18px;padding:30px;transition:transform .4s var(--ease),border-color .4s}
.card:hover{transform:translateY(-6px);border-color:rgba(217,117,56,.45)}
.card h2{font-size:1.45rem;color:#fff;margin:16px 0 10px;line-height:1.25;letter-spacing:-.01em}
.card p{font-size:.97rem;color:var(--navy-300);flex:1}
.card .meta{font-size:.82rem;color:var(--navy-300);margin-top:20px;display:flex;gap:10px;align-items:center}
.card .meta .dot{width:4px;height:4px;border-radius:50%;background:var(--navy-300)}
.card .go{font-family:var(--f-display);font-weight:700;font-size:.9rem;color:var(--o-300);margin-top:14px;display:inline-flex;gap:7px;align-items:center;transition:gap .25s}
.card:hover .go{gap:12px}

/* article hero */
.art-hero{padding:54px 0 46px;position:relative;isolation:isolate}
.art-hero::before{content:"";position:absolute;inset:0 0 auto;height:300px;z-index:-1;background:radial-gradient(55% 100% at 50% 0,rgba(201,96,40,.14),transparent 70%)}
.art-hero .back{font-size:.85rem;color:var(--navy-300);display:inline-flex;gap:7px;align-items:center;margin-bottom:26px;transition:color .2s}
.art-hero .back:hover{color:var(--o-300)}
.art-hero h1{font-size:clamp(2.1rem,5.2vw,3.3rem);font-weight:700;max-width:18ch;margin:18px 0 20px}
.art-meta{display:flex;gap:13px;align-items:center;font-size:.88rem;color:var(--navy-300);flex-wrap:wrap}
.art-meta .dot{width:4px;height:4px;border-radius:50%;background:var(--navy-300)}

/* reading sheet (cream paper on navy) */
.sheet-wrap{background:var(--navy-950);padding:56px 0 70px}
.sheet{max-width:var(--read);margin-inline:auto;background:var(--cream);color:var(--ink-soft);border-radius:22px;padding:clamp(30px,6vw,70px);box-shadow:0 50px 100px -45px rgba(0,0,0,.7)}
.sheet p{font-size:1.17rem;line-height:1.85;margin-bottom:1.25em}
.sheet p.lead{font-size:1.34rem;line-height:1.5;color:var(--ink);font-weight:600;margin-bottom:1em}
.sheet strong{color:var(--ink);font-weight:700}
.sheet em{color:var(--o-600);font-style:normal;font-weight:600}
.sheet .sep{border:0;text-align:center;height:1em;margin:1.7em 0}
.sheet .sep::before{content:"◆ ◆ ◆";color:var(--o-400);font-size:.6rem;letter-spacing:.5em;opacity:.6}
.sheet blockquote{border-left:3px solid var(--o-500);padding:4px 0 4px 26px;margin:1.5em 0;font-family:var(--f-display);font-weight:600;font-size:1.4rem;color:var(--ink);line-height:1.4}
.sheet blockquote.q{font-style:italic}

/* end cta */
.art-cta{max-width:var(--read);margin:36px auto 0;text-align:center;background:linear-gradient(135deg,var(--o-600),var(--o-500));border-radius:22px;padding:46px 32px;position:relative;overflow:hidden}
.art-cta::before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 80% 15%,rgba(255,255,255,.16),transparent 55%)}
.art-cta h3{color:#fff;font-size:clamp(1.4rem,3vw,1.8rem);margin-bottom:10px;position:relative}
.art-cta p{color:rgba(255,255,255,.92);margin-bottom:24px;position:relative}
.art-cta .btn{background:var(--navy-800);color:#fff;position:relative}
.art-cta .btn:hover{background:var(--navy-900)}

/* footer — shared component, injected by /footer.js (self-scoped .x10f styles).
   No bare `footer{}` rules here: they cascade onto the injected footer
   (text-align:center) and break its left-aligned grid layout. */

@media(max-width:680px){
  .nav-links a:not(.btn){display:none}
  .sheet{border-radius:0;margin-inline:-20px;padding:34px 24px}
}