/* ============================================================
   BLOG MỢ DUNG — design system (brand đỏ mận · gold · kem)
   Dùng chung cho trang danh sách + trang bài viết.
   ============================================================ */

:root{
  --primary:#c0122b;      /* đỏ mận — thương hiệu */
  --primary-soft:#9a0e22;
  --accent:#e01e2f;
  --accent-dark:#a30f22;
  --gold:#d4af37;
  --gold-soft:#e7c85f;
  --dark:#141210;
  --ink:#241d1b;          /* chữ chính */
  --muted:#7a6f68;        /* chữ phụ */
  --line:#ece2d6;         /* viền nhạt */
  --bg:#fffdf7;           /* nền kem sáng */
  --cream:#fbf2e6;        /* nền khối */
  --card:#ffffff;
  --shadow-sm:0 4px 16px rgba(90,30,40,.07);
  --shadow-md:0 12px 32px rgba(90,30,40,.10);
  --shadow-lg:0 22px 50px rgba(90,30,40,.16);
  --radius:16px;
  --radius-sm:10px;
  --maxw:1140px;
  --read:none;
  --font-display:'Montserrat',system-ui,sans-serif;
  --font-body:'Be Vietnam Pro',system-ui,sans-serif;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-body);
  color:var(--ink);
  background:var(--bg);
  line-height:1.72;
  font-size:1.05rem;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:var(--primary);text-decoration:none}
h1,h2,h3,h4{font-family:var(--font-display);line-height:1.2;color:var(--ink);font-weight:800}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 22px}

/* ---------- highlight / tiện ích ---------- */
.hl{background:#f7d94a;color:#1a1310;padding:1px 6px;border-radius:5px;font-weight:700;
  -webkit-box-decoration-break:clone;box-decoration-break:clone}
.eyebrow{font-family:var(--font-display);text-transform:uppercase;letter-spacing:2px;
  font-size:.74rem;font-weight:700}

/* ============================================================
   NAVBAR
   ============================================================ */
.nav{position:sticky;top:0;z-index:60;background:rgba(255,253,247,.88);
  backdrop-filter:saturate(160%) blur(10px);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:66px}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--font-display);
  font-weight:900;font-size:1.32rem;color:var(--primary);letter-spacing:-.3px}
.brand .dot{width:10px;height:10px;border-radius:50%;background:var(--gold);
  box-shadow:0 0 0 4px rgba(212,175,55,.22)}
.brand span{color:var(--dark)}
.nav-links{display:flex;align-items:center;gap:26px;list-style:none}
.nav-links a{color:var(--ink);font-weight:600;font-size:.96rem;position:relative;padding:4px 0}
.nav-links a.active,.nav-links a:hover{color:var(--primary)}
.nav-links a.active::after{content:"";position:absolute;left:0;right:0;bottom:-6px;height:2px;
  background:var(--gold);border-radius:2px}
.nav-cta{background:linear-gradient(180deg,#f7cf2e,#dfa400);color:#1a1310;
  padding:9px 20px;border-radius:9px;font-weight:800;font-size:.9rem;
  box-shadow:0 6px 16px rgba(223,164,0,.32);transition:transform .16s,box-shadow .16s;white-space:nowrap}
.nav-cta:hover{transform:translateY(-1px);box-shadow:0 10px 22px rgba(223,164,0,.45)}
.burger{display:none;background:none;border:0;font-size:1.5rem;color:var(--primary);cursor:pointer}

/* ============================================================
   HERO
   ============================================================ */
.hero{position:relative;background:linear-gradient(150deg,#c0122b 0%,#3a0c10 62%,#160b09 100%);
  color:#fff;border-top:4px solid var(--gold);overflow:hidden}
.hero::after{content:"";position:absolute;inset:0;opacity:.5;pointer-events:none;
  background:radial-gradient(600px 300px at 82% -10%,rgba(212,175,55,.28),transparent 60%)}
.hero .wrap{position:relative;z-index:2;padding:62px 22px 66px;text-align:center}
.hero .eyebrow{color:var(--gold-soft);margin-bottom:16px}
.hero h1{color:#fff;font-weight:900;font-size:clamp(2.1rem,5vw,3.15rem);letter-spacing:-.5px;margin-bottom:16px}
.hero h1 em{color:#f2c53d;font-style:italic}
.hero p{color:#f4e7d6;font-size:1.15rem;max-width:620px;margin:0 auto;line-height:1.6}
.hero .meta{margin-top:22px;display:flex;gap:22px;justify-content:center;flex-wrap:wrap;
  color:#e8d0a6;font-size:.92rem}
.hero .meta span{display:flex;align-items:center;gap:7px}

/* ============================================================
   BỘ LỌC DANH MỤC
   ============================================================ */
.cats{background:var(--bg);border-bottom:1px solid var(--line);position:sticky;top:66px;z-index:40}
.cats .wrap{display:flex;gap:10px;padding:14px 22px;overflow-x:auto;scrollbar-width:none}
.cats .wrap::-webkit-scrollbar{display:none}
.chip{white-space:nowrap;border:1px solid var(--line);background:#fff;color:var(--ink);
  padding:8px 16px;border-radius:999px;font-weight:600;font-size:.9rem;cursor:pointer;
  transition:all .16s;font-family:var(--font-body)}
.chip:hover{border-color:var(--gold);color:var(--primary)}
.chip.active{background:var(--primary);border-color:var(--primary);color:#fff;
  box-shadow:0 6px 14px rgba(192,18,43,.28)}

/* ============================================================
   BÀI NỔI BẬT (featured)
   ============================================================ */
.section{padding-top:46px;padding-bottom:46px}
.section-head{display:flex;align-items:baseline;gap:14px;margin-bottom:24px}
.section-head h2{font-size:1.5rem;color:var(--ink)}
.section-head .bar{flex:1;height:1px;background:var(--line)}
.section-head .eyebrow{color:var(--gold)}

.feature{display:grid;grid-template-columns:1.05fr 1fr;gap:0;background:var(--card);
  border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-md)}
.feature .thumb{min-height:340px}
.feature .body{padding:38px 40px;display:flex;flex-direction:column;justify-content:center}
.feature .body h3{font-size:clamp(1.5rem,2.4vw,2rem);line-height:1.18;margin:14px 0 12px;color:var(--ink)}
.feature .body h3 a{color:inherit}
.feature .body h3 a:hover{color:var(--primary)}
.feature .excerpt{color:#4a3f3a;margin-bottom:20px;font-size:1.06rem}
.feature .btn{align-self:flex-start}

/* ---------- thumbnail gradient (thay ảnh) ---------- */
.thumb{position:relative;display:flex;align-items:center;justify-content:center;color:#fff;overflow:hidden}
.thumb::before{content:"";position:absolute;inset:0;
  background-image:radial-gradient(rgba(255,255,255,.16) 1px,transparent 1.4px);
  background-size:18px 18px;opacity:.5}
.thumb .emoji{font-size:4.6rem;filter:drop-shadow(0 8px 16px rgba(0,0,0,.28));position:relative;z-index:2}
.thumb .tag{position:absolute;top:14px;left:14px;z-index:3}
.g-kdo{background:linear-gradient(135deg,#c0122b,#7a0a1c)}
.g-ban{background:linear-gradient(135deg,#d99b1f,#9c5c17)}
.g-mkt{background:linear-gradient(135deg,#e01e2f,#8f0d1f)}
.g-web{background:linear-gradient(135deg,#3a1620,#7a1226)}
.g-tiem{background:linear-gradient(135deg,#a8631a,#5c3210)}
.g-story{background:linear-gradient(135deg,#8a1230,#340a14)}

/* ---------- category tag ---------- */
.tag{display:inline-block;background:rgba(255,255,255,.16);color:#fff;border:1px solid rgba(255,255,255,.35);
  padding:4px 12px;border-radius:999px;font-family:var(--font-display);font-weight:700;
  font-size:.72rem;letter-spacing:.5px;text-transform:uppercase;backdrop-filter:blur(2px)}
.tag.solid{background:var(--primary);border-color:transparent}
.tag.ink{background:var(--cream);color:var(--primary);border-color:var(--line)}

/* ============================================================
   LƯỚI BÀI VIẾT
   ============================================================ */
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;box-shadow:var(--shadow-sm);transition:transform .2s,box-shadow .2s;
  display:flex;flex-direction:column}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.card .thumb{height:172px}
.card .thumb .emoji{font-size:3.2rem}
.card .body{padding:20px 22px 22px;display:flex;flex-direction:column;flex:1}
.card .kmeta{font-size:.76rem;color:var(--muted);font-weight:600;letter-spacing:.4px;
  text-transform:uppercase;margin-bottom:9px;font-family:var(--font-display)}
.card h3{font-size:1.14rem;line-height:1.3;margin-bottom:10px;color:var(--ink)}
.card h3 a{color:inherit}
.card h3 a:hover{color:var(--primary)}
.card .excerpt{font-size:.95rem;color:#5a4f49;margin-bottom:16px;flex:1}
.card .foot{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:.82rem;
  border-top:1px solid var(--line);padding-top:13px}
.card .foot .av{width:24px;height:24px;border-radius:50%;background:linear-gradient(135deg,var(--primary),#7a0a1c);
  color:#fff;display:grid;place-items:center;font-size:.66rem;font-weight:800;font-family:var(--font-display)}

/* card "Sắp ra" (bài chưa viết) */
.card.soon{opacity:.9}
.card.soon:hover{transform:none;box-shadow:var(--shadow-sm)}
.card.soon h3{color:var(--muted)}
.card.soon .thumb{filter:grayscale(.35)}
.badge-soon{position:absolute;top:14px;right:14px;z-index:3;background:rgba(20,18,16,.55);color:#f2e7d6;
  border:1px solid rgba(255,255,255,.32);padding:3px 11px;border-radius:999px;font-family:var(--font-display);
  font-weight:700;font-size:.66rem;letter-spacing:.6px;text-transform:uppercase;backdrop-filter:blur(2px)}

/* ============================================================
   NÚT
   ============================================================ */
.btn{display:inline-flex;align-items:center;gap:9px;background:linear-gradient(180deg,#f7cf2e,#dfa400);
  color:#1a1310;padding:14px 30px;border-radius:11px;font-weight:800;font-family:var(--font-body);
  font-size:1rem;box-shadow:0 10px 24px rgba(223,164,0,.34);transition:transform .16s,box-shadow .16s}
.btn:hover{transform:translateY(-2px);box-shadow:0 14px 30px rgba(223,164,0,.5)}
.btn.ghost{background:transparent;color:#fff;border:1.5px solid rgba(255,255,255,.5);box-shadow:none}
.btn.ghost:hover{background:rgba(255,255,255,.1);border-color:#fff}
.btn.red{background:linear-gradient(180deg,var(--accent),var(--primary-soft));color:#fff;
  box-shadow:0 10px 24px rgba(192,18,43,.34)}

/* ============================================================
   DẢI CTA
   ============================================================ */
.cta-band{background:linear-gradient(150deg,#c0122b,#2a0a0d);color:#fff;border-top:4px solid var(--gold);
  border-bottom:4px solid var(--gold);text-align:center;position:relative;overflow:hidden}
.cta-band::after{content:"";position:absolute;inset:0;
  background:radial-gradient(500px 260px at 20% 120%,rgba(212,175,55,.24),transparent 60%);pointer-events:none}
.cta-band .wrap{position:relative;z-index:2;padding:56px 22px}
.cta-band h2{color:#fff;font-size:clamp(1.6rem,3.2vw,2.2rem);margin-bottom:12px}
.cta-band p{color:#f4e7d6;max-width:560px;margin:0 auto 26px;font-size:1.1rem}

/* ============================================================
   FOOTER
   ============================================================ */
.footer{background:var(--dark);color:#d8cabb;padding:52px 0 26px}
.footer .cols{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:38px;margin-bottom:34px}
.footer .brand{color:#fff;margin-bottom:14px}
.footer .brand span{color:var(--gold)}
.footer p{color:#b7a898;font-size:.94rem;max-width:340px}
.footer h4{color:#fff;font-size:.82rem;text-transform:uppercase;letter-spacing:1.5px;margin-bottom:16px}
.footer ul{list-style:none}
.footer li{margin-bottom:10px}
.footer a{color:#c8b9a9;font-size:.94rem}
.footer a:hover{color:var(--gold)}
.footer .bottom{border-top:1px solid rgba(255,255,255,.1);padding-top:20px;
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;color:#8f8175;font-size:.85rem}

/* ============================================================
   TRANG BÀI VIẾT
   ============================================================ */
.art-hero{background:var(--cream);border-bottom:1px solid var(--line)}
.art-hero .wrap{max-width:820px;padding:34px 22px 30px}
.crumb{font-size:.85rem;color:var(--muted);margin-bottom:18px}
.crumb a{color:var(--muted)}.crumb a:hover{color:var(--primary)}
.crumb b{color:var(--primary)}
.art-hero h1{font-size:clamp(1.9rem,4.3vw,2.75rem);line-height:1.16;letter-spacing:-.5px;
  color:var(--ink);margin:12px 0 20px}
.byline{display:flex;align-items:center;gap:13px;flex-wrap:wrap}
.byline .av{width:46px;height:46px;border-radius:50%;background:linear-gradient(135deg,var(--primary),#7a0a1c);
  color:#fff;display:grid;place-items:center;font-weight:800;font-family:var(--font-display);
  box-shadow:0 6px 14px rgba(192,18,43,.3)}
.byline .who b{color:var(--ink);font-weight:700}
.byline .who .sub{color:var(--muted);font-size:.86rem}

.art-cover{max-width:900px;margin:26px auto 0;padding:0 22px}
.art-cover .box{height:clamp(200px,34vw,360px);border-radius:var(--radius);color:#fff;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;
  box-shadow:var(--shadow-md);text-align:center;padding:20px}
.art-cover .box .emoji{font-size:4.6rem;filter:drop-shadow(0 8px 16px rgba(0,0,0,.3))}
.art-cover .cap{color:var(--muted);font-size:.82rem;text-align:center;margin-top:10px;font-style:italic}

/* layout đọc: nội dung + mục lục */
.art-layout{max-width:1080px;margin:0 auto;padding:44px 22px 20px;
  display:grid;grid-template-columns:minmax(0,1fr) 264px;gap:52px;align-items:start}
.article{max-width:none;font-size:1.09rem}
.article > p{margin:0 0 20px}
.article .lead{font-size:1.2rem;line-height:1.6;color:var(--ink)}
.article .lead strong,.article strong{color:var(--primary);font-weight:700}
.article h2{font-size:1.62rem;margin:40px 0 15px;color:var(--ink);scroll-margin-top:150px;
  padding-top:8px;position:relative}
.article h2::before{content:"";position:absolute;top:-2px;left:0;width:46px;height:4px;
  background:var(--gold);border-radius:3px}
.article h3{font-size:1.22rem;margin:26px 0 10px;color:var(--primary-soft)}
.article ul,.article ol{margin:0 0 20px;padding-left:22px}
.article li{margin-bottom:9px}
.article ol{counter-reset:li;list-style:none;padding-left:0}
.article ol > li{counter-increment:li;position:relative;padding-left:44px;margin-bottom:13px}
.article ol > li::before{content:counter(li);position:absolute;left:0;top:-1px;width:29px;height:29px;
  background:var(--primary);color:#fff;border-radius:50%;display:grid;place-items:center;
  font-family:var(--font-display);font-weight:800;font-size:.9rem;box-shadow:0 4px 10px rgba(192,18,43,.28)}
.article a.inlink{color:var(--primary);font-weight:600;border-bottom:1.5px solid rgba(192,18,43,.3)}
.article a.inlink:hover{border-color:var(--primary)}

/* hộp Trả lời nhanh */
.quickbox{background:linear-gradient(180deg,#fffaf0,#fbf2e0);border:1px solid #ecd9a8;
  border-left:5px solid var(--gold);border-radius:14px;padding:24px 28px;margin:26px 0 30px;
  box-shadow:var(--shadow-sm)}
.quickbox .qh{font-family:var(--font-display);font-weight:800;color:var(--primary);
  text-transform:uppercase;letter-spacing:1px;font-size:.86rem;margin-bottom:14px;
  display:flex;align-items:center;gap:9px}
.quickbox ol{margin:0;padding-left:0}
.quickbox ol > li{padding-left:40px;margin-bottom:11px}
.quickbox ol > li::before{width:26px;height:26px;font-size:.85rem;background:var(--gold);color:#1a1310;
  box-shadow:0 3px 8px rgba(212,175,55,.4)}

/* định nghĩa nổi bật */
.def{background:#fff;border:1px solid var(--line);border-left:4px solid var(--primary);
  border-radius:0 12px 12px 0;padding:15px 20px;margin:22px 0;color:#3d332f;box-shadow:var(--shadow-sm)}

/* ảnh minh hoạ trong bài (placeholder) */
.figph{background:var(--cream);border:1px dashed #d9c6a8;border-radius:12px;
  padding:26px;margin:24px 0;text-align:center;color:var(--muted);font-size:.9rem}
.figph .ic{font-size:2rem;display:block;margin-bottom:8px;opacity:.7}

/* bảng */
.article .tablewrap{overflow-x:auto;margin:24px 0;border-radius:12px;box-shadow:var(--shadow-sm)}
.article table{width:100%;border-collapse:collapse;background:#fff;font-size:.98rem;min-width:520px}
.article th,.article td{padding:12px 16px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
.article thead th{background:var(--primary);color:#fff;font-family:var(--font-display);font-weight:700;font-size:.9rem}
.article tbody tr:nth-child(even){background:#fdf8ef}
.article td:first-child{font-weight:600;color:var(--ink)}

/* trích dẫn / câu chốt */
.pullquote{font-family:var(--font-display);font-style:italic;font-size:1.35rem;line-height:1.4;
  color:var(--primary);text-align:center;border-top:2px solid var(--gold);border-bottom:2px solid var(--gold);
  padding:22px 10px;margin:32px 0}

/* FAQ */
.faq{margin:22px 0 8px}
.faq details{background:#fff;border:1px solid var(--line);border-radius:12px;margin-bottom:12px;
  overflow:hidden;box-shadow:var(--shadow-sm)}
.faq summary{cursor:pointer;list-style:none;padding:16px 22px;font-family:var(--font-display);
  font-weight:700;color:var(--ink);font-size:1.04rem;display:flex;justify-content:space-between;
  align-items:center;gap:14px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--primary);font-size:1.5rem;font-weight:700;
  transition:transform .2s;line-height:1}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details[open] summary{color:var(--primary)}
.faq .a{padding:0 22px 18px;color:#4a3f3a}

/* hộp tác giả */
.authorbox{display:flex;gap:20px;background:linear-gradient(150deg,#fbf2e6,#fff);
  border:1px solid var(--line);border-radius:16px;padding:26px 28px;margin:40px 0 10px;box-shadow:var(--shadow-sm)}
.authorbox .av{width:72px;height:72px;border-radius:50%;flex-shrink:0;
  background:linear-gradient(135deg,var(--primary),#7a0a1c);color:#fff;display:grid;place-items:center;
  font-family:var(--font-display);font-weight:800;font-size:1.5rem;box-shadow:0 8px 18px rgba(192,18,43,.32)}
.authorbox h4{font-size:1.15rem;color:var(--primary);margin-bottom:4px}
.authorbox .role{color:var(--muted);font-size:.86rem;margin-bottom:10px}
.authorbox p{font-size:.96rem;color:#4a3f3a;margin:0}
.updated{color:var(--muted);font-size:.86rem;font-style:italic;margin-top:26px}

/* mục lục dính lề */
.toc{position:sticky;top:96px}
.toc .card2{background:#fff;border:1px solid var(--line);border-radius:14px;padding:20px 20px;
  box-shadow:var(--shadow-sm)}
.toc h4{font-family:var(--font-display);font-size:.78rem;text-transform:uppercase;letter-spacing:1.4px;
  color:var(--gold);margin-bottom:14px;padding-bottom:10px;border-bottom:1px solid var(--line)}
.toc ul{list-style:none}
.toc li{margin-bottom:2px}
.toc a{display:block;color:#5a4f49;font-size:.9rem;line-height:1.4;padding:6px 10px;border-radius:8px;
  border-left:2px solid transparent;transition:all .15s}
.toc a:hover{background:var(--cream);color:var(--primary)}
.toc a.active{background:var(--cream);color:var(--primary);border-left-color:var(--gold);font-weight:600}
.toc .share{margin-top:16px;padding-top:16px;border-top:1px solid var(--line);
  display:flex;gap:8px;align-items:center;color:var(--muted);font-size:.8rem}
.toc .share a{width:34px;height:34px;border-radius:8px;background:var(--cream);display:grid;place-items:center;
  padding:0;border:0}
.toc .share a:hover{background:var(--primary);color:#fff}

/* liên quan */
.related{background:var(--cream);border-top:1px solid var(--line)}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media(max-width:940px){
  .art-layout{grid-template-columns:1fr;gap:0}
  .toc{display:none}
  .grid{grid-template-columns:repeat(2,1fr)}
  .feature{grid-template-columns:1fr}
  .feature .thumb{min-height:220px}
}
@media(max-width:680px){
  body{font-size:1.02rem}
  .nav-links{display:none}
  .burger{display:block}
  .grid{grid-template-columns:1fr}
  .footer .cols{grid-template-columns:1fr;gap:26px}
  .feature .body{padding:26px 24px}
  .article{font-size:1.05rem}
  .cats{top:66px}
}