/* Khuôn bài viết daklab.vn — bản 08/10/2026. Màu theo hệ DAK LAB: giấy ngà, mực, đất nung (mặt tiền), rêu (bộ máy). */
:root{--muc:#141414;--giay:#fbf9f5;--kem:#f5f1e8;--trang:#fff;--dat:#c96a3f;--dat-dam:#a9532c;--ray:#2d4a35;--ray-nhat:#e6ede7;--da:#8a8378;--phu:#5c564c;--ke:#e4dfd4;
--sans:"Be Vietnam Pro",-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;color-scheme:light}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:84px}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
body{font-family:var(--sans);background:var(--giay);color:var(--muc);line-height:1.75;-webkit-font-smoothing:antialiased}
a{color:var(--dat-dam);text-underline-offset:3px}
a:hover{color:var(--muc)}
:focus-visible{outline:2px solid var(--dat-dam);outline-offset:2px}

/* thanh tiến độ đọc */
.tien-do{position:fixed;top:0;left:0;height:3px;width:0;background:var(--dat);z-index:50}

/* đầu trang */
.top{position:sticky;top:0;z-index:40;background:rgba(251,249,245,.95);backdrop-filter:blur(8px);border-bottom:1px solid var(--ke)}
.top .in{max-width:1060px;margin:0 auto;padding:10px 20px;display:flex;align-items:center;gap:18px;font-size:14.5px}
.top .logo{display:flex;align-items:center;gap:9px;color:var(--muc);text-decoration:none;font-weight:800;letter-spacing:1.5px;font-size:16px}
.top nav{display:flex;gap:22px;margin-left:auto;font-weight:500}
.top nav a{color:var(--muc);text-decoration:none}
.top nav a:hover,.top nav a[aria-current]{color:var(--dat-dam)}
.top .zalo{display:inline-flex;align-items:center;min-height:42px;padding:0 16px;background:var(--muc);color:var(--giay);border-radius:4px;text-decoration:none;font-weight:600;font-size:14px}
.top .zalo:hover{color:var(--giay);opacity:.88}
.mark{color:var(--dat);font-weight:700}
.crumb{display:none}

/* khung bài: cột chữ + cột mục lục dính bên phải trên máy tính */
main{max-width:720px;margin:0 auto;padding:0 20px 72px}
@media (min-width:1100px){
  main{max-width:1060px;display:grid;grid-template-columns:minmax(0,720px) 260px;column-gap:56px;justify-content:center}
  main>*{grid-column:1}
  main>.ben{grid-column:2;grid-row:1/span 300}
}

.hero{padding:48px 0 28px}
.eyebrow{font-size:12px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--dat-dam);margin-bottom:14px}
h1{font-size:42px;line-height:1.12;font-weight:800;letter-spacing:-.025em;text-wrap:balance;margin-bottom:16px}
.dek{font-size:19px;line-height:1.6;color:var(--phu);margin-bottom:20px;text-wrap:pretty}
.byline{display:flex;align-items:center;gap:10px;font-size:13.5px;color:var(--phu)}
.byline:before{content:"";width:28px;height:28px;flex:none;background:var(--muc) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 34 28'%3E%3Cpath d='M8 2H2v24h6M26 2h6v24h-6' fill='none' stroke='%23c96a3f' stroke-width='3.5'/%3E%3Ccircle cx='17' cy='14' r='5' fill='%23f5f1e8'/%3E%3C/svg%3E") center/18px no-repeat;border-radius:999px}

.bia{margin:0 0 36px}
.bia img{display:block;width:100%;height:auto;aspect-ratio:1200/630}

/* trả lời nhanh */
.nhanh{background:var(--trang);border:2px solid var(--muc);padding:24px 26px;margin:0 0 36px}
.nhanh .nhan{font-size:12px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--dat-dam);margin-bottom:12px}
.nhanh ul{list-style:none;margin:0;display:flex;flex-direction:column;gap:10px}
.nhanh li{display:grid;grid-template-columns:22px minmax(0,1fr);gap:8px;font-size:16.5px;line-height:1.6;margin:0}
.nhanh li:before{content:"";width:16px;height:16px;margin-top:5px;background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%232d4a35' stroke-width='3' stroke-linecap='square'%3E%3Cpath d='M4 12l5 5 11-11'/%3E%3C/svg%3E") center/contain no-repeat}

/* mục lục */
.muc-luc{border-top:3px solid var(--dat);padding-top:14px;font-size:14px}
.muc-luc .nhan{font-size:12px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--phu);margin-bottom:8px}
.muc-luc ol{list-style:none;margin:0;counter-reset:m}
.muc-luc li{counter-increment:m;margin:0;font-size:14px}
.muc-luc a{display:grid;grid-template-columns:26px minmax(0,1fr);padding:7px 0;color:var(--phu);text-decoration:none;line-height:1.45;border-bottom:1px solid var(--ke)}
.muc-luc a:before{content:counter(m,decimal-leading-zero);font-weight:700;color:var(--dat);font-variant-numeric:tabular-nums}
.muc-luc a:hover,.muc-luc a.dang{color:var(--muc)}
.muc-luc a.dang{font-weight:600}
.ben{display:none}
@media (min-width:1100px){.ben{display:block;padding-top:48px}.ben .dinh{position:sticky;top:88px;display:flex;flex-direction:column;gap:28px}}
.ben .the{background:var(--kem);padding:18px;font-size:14px;line-height:1.55;display:flex;flex-direction:column;gap:10px}
.ben .the b{font-size:15px}
.ben .the a.nut{display:flex;align-items:center;justify-content:center;min-height:44px;background:var(--muc);color:var(--giay);border-radius:4px;text-decoration:none;font-weight:600}
.muc-luc-gon{margin:0 0 36px;border:1px solid var(--ke);background:var(--trang)}
.muc-luc-gon summary{cursor:pointer;list-style:none;padding:14px 18px;font-weight:600;display:flex;justify-content:space-between;min-height:48px;align-items:center}
.muc-luc-gon summary::-webkit-details-marker{display:none}
.muc-luc-gon summary:after{content:"+";color:var(--dat-dam);font-size:22px;font-weight:400}
.muc-luc-gon[open] summary:after{content:"−"}
.muc-luc-gon .muc-luc{border-top:0;padding:0 18px 12px}
.muc-luc-gon .muc-luc .nhan{display:none}
@media (min-width:1100px){.muc-luc-gon{display:none}}

/* chữ thân bài */
h2{font-size:27px;line-height:1.25;font-weight:800;letter-spacing:-.02em;margin:56px 0 16px;padding-top:24px;border-top:1px solid var(--ke);text-wrap:balance}
h3{font-size:19px;line-height:1.35;font-weight:700;margin:32px 0 10px}
p{margin-bottom:18px;font-size:17px}
ul,ol{margin:0 0 20px 22px}
li{margin-bottom:9px;font-size:17px}
li::marker{color:var(--dat);font-weight:700}
strong{font-weight:700}
.lead{font-size:20px;line-height:1.65}
.lead:first-letter{font-size:3.1em;float:left;line-height:.85;font-weight:800;color:var(--dat);margin:.08em .1em 0 0}

/* bảng */
.scroll{overflow-x:auto;margin:8px 0 24px;border:1px solid var(--ke);background:var(--trang)}
table{width:100%;border-collapse:collapse;font-size:15.5px;min-width:480px}
th{background:var(--muc);color:var(--kem);text-align:left;padding:12px 14px;font-weight:600;font-size:13.5px;letter-spacing:.02em}
td{padding:12px 14px;border-bottom:1px solid var(--ke);vertical-align:top}
tr:nth-child(even) td{background:#fcfbf8}
th.n,td.n{text-align:right;font-variant-numeric:tabular-nums;white-space:nowrap}
tr:last-child td{border-bottom:0}
tr.tong td{background:var(--kem);font-weight:700}
.re{color:var(--ray);font-weight:700}
.sonho{font-size:13.5px;color:var(--phu)}
.big{font-size:15px;color:var(--phu)}

/* ô lưu ý */
.box{background:var(--kem);padding:24px 26px;margin:30px 0;position:relative}
.box:before{content:"";position:absolute;left:0;top:0;width:44px;height:4px;background:var(--dat)}
.box.xanh{background:var(--ray-nhat)}
.box.xanh:before{background:var(--ray)}
.box h3{margin-top:0;font-size:13px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--dat-dam)}
.box.xanh h3{color:var(--ray)}
.box p{font-size:17px}
.box p:last-child,.box ul:last-child{margin-bottom:0}

/* chào giữa bài */
.chao{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:18px;align-items:center;border:1px solid var(--ke);background:var(--trang);padding:20px 22px;margin:36px 0}
.chao b{display:block;font-size:17px;line-height:1.35;margin-bottom:4px}
.chao span{font-size:15px;color:var(--phu);line-height:1.5}
.chao a{display:inline-flex;align-items:center;min-height:46px;padding:0 18px;border-radius:4px;background:var(--muc);color:var(--giay);text-decoration:none;font-weight:600;font-size:14.5px;white-space:nowrap}
.chao a:hover{color:var(--giay);opacity:.88}

/* chào cuối bài */
.cta{background:var(--muc);color:var(--kem);padding:34px 32px;margin:48px 0}
.cta h3{margin:0 0 10px;font-size:23px;line-height:1.3;font-weight:800;color:var(--giay)}
.cta p{margin-bottom:20px;font-size:16px;color:#cfc8bb}
.btn{display:inline-flex;align-items:center;min-height:50px;background:var(--kem);color:var(--muc);padding:0 24px;font-weight:700;font-size:15.5px;text-decoration:none;border-radius:4px}
.btn:hover{background:var(--dat);color:var(--muc)}
.cta .btn+.btn,.cta .phu{margin-left:10px;background:transparent;color:var(--kem);border:1px solid #7a7368}

/* hỏi đáp, nguồn */
.faq{border-top:1px solid var(--ke);margin-top:48px;padding-top:8px}
.faq h2{border-top:0;padding-top:0;margin-top:24px}
.faq details{border-bottom:1px solid var(--ke);padding:16px 0}
.faq summary{font-weight:700;cursor:pointer;font-size:17px;list-style:none;display:flex;gap:12px;min-height:28px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"+";color:var(--dat);font-weight:800;width:14px;flex:none}
.faq details[open] summary::before{content:"–"}
.faq p{margin:10px 0 0 26px;font-size:16px}
.nguon{font-size:14px;color:var(--phu);background:var(--kem);margin-top:48px;padding:22px 24px}
.nguon li{font-size:14px;margin-bottom:6px}

/* người viết + bài liên quan */
.tac-gia{display:grid;grid-template-columns:56px minmax(0,1fr);gap:16px;align-items:center;border-top:1px solid var(--ke);border-bottom:1px solid var(--ke);padding:22px 0;margin:48px 0 0}
.tac-gia .dau{width:56px;height:56px;background:var(--muc) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 34 28'%3E%3Cpath d='M8 2H2v24h6M26 2h6v24h-6' fill='none' stroke='%23c96a3f' stroke-width='3.5'/%3E%3Ccircle cx='17' cy='14' r='5' fill='%23f5f1e8'/%3E%3C/svg%3E") center/32px no-repeat;border-radius:999px}
.tac-gia b{font-size:16px}
.tac-gia p{font-size:14.5px;color:var(--phu);margin:2px 0 0}
.lien-quan{margin-top:48px}
.lien-quan .nhan{font-size:12px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--dat-dam);margin-bottom:16px}
.lien-quan .luoi{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.lien-quan a{display:flex;flex-direction:column;gap:10px;text-decoration:none;color:var(--muc)}
.lien-quan img{width:100%;height:auto;aspect-ratio:1200/630;display:block;transition:transform .2s}
.lien-quan a:hover img{transform:translateY(-3px)}
.lien-quan b{font-size:15.5px;line-height:1.4}
.lien-quan span{font-size:13px;color:var(--phu)}

footer{border-top:1px solid var(--ke);padding:24px 0;font-size:13.5px;color:var(--phu);background:var(--giay)}
footer .in{max-width:1060px;margin:0 auto;padding:0 20px}

/* thanh đáy điện thoại */
.day{display:none}

@media(max-width:760px){
  .top nav{display:none}
  .top .zalo{margin-left:auto}
  h1{font-size:30px}
  .dek{font-size:17px}
  h2{font-size:23px;margin-top:44px}
  p,li{font-size:16.5px}
  .lead{font-size:18px}
  .nhanh{padding:20px}
  .box{padding:20px}
  .cta{padding:26px 22px}
  .cta .btn+.btn,.cta .phu{margin:10px 0 0}
  .chao{grid-template-columns:minmax(0,1fr)}
  .chao a{justify-content:center}
  .lien-quan .luoi{grid-template-columns:minmax(0,1fr)}
  .lien-quan a{display:grid;grid-template-columns:120px minmax(0,1fr);gap:12px;align-items:start}
  .lien-quan a div{display:flex;flex-direction:column;gap:4px}
  .day{display:flex;position:fixed;left:0;right:0;bottom:0;z-index:45;gap:10px;padding:10px 16px calc(10px + env(safe-area-inset-bottom));background:rgba(251,249,245,.97);border-top:1px solid var(--ke)}
  .day a{display:flex;align-items:center;justify-content:center;min-height:48px;border-radius:4px;text-decoration:none;font-weight:600;font-size:15px}
  .day .goi{padding:0 18px;border:1px solid var(--da);color:var(--muc)}
  .day .nhan-zalo{flex:1;background:var(--muc);color:var(--giay)}
  body{padding-bottom:74px}
}

/* 12/10/2026: thanh trên cùng giống các trang khác + chuyển động nhẹ */
.dlnav{padding:0!important;margin:0!important;color:#141414!important;text-align:left!important;position:sticky;top:0;z-index:40;background:rgba(251,249,245,.95);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border-bottom:1px solid #e4dfd4;font-family:"Be Vietnam Pro",-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif}
.dlnav .w{max-width:1160px;margin:0 auto;padding:12px 40px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.dlnav .lg{display:flex;align-items:center;gap:10px;text-decoration:none;color:#141414}
.dlnav .lg b{font-weight:800;letter-spacing:1.5px;font-size:17px}
.dlnav nav{display:flex;gap:26px;font-size:14.5px;font-weight:700;margin:0;padding:0}
.dlnav nav a{font-weight:700!important}
.dlnav nav a{color:#141414;text-decoration:none}
.dlnav nav a:hover,.dlnav nav a[aria-current]{color:#a9532c}
.dlnav .z{display:inline-flex;align-items:center;min-height:44px;padding:0 18px;border-radius:4px;background:#141414;color:#fbf9f5;text-decoration:none;font-weight:700;font-size:14px}
@media (max-width:1000px){.dlnav nav{display:none}}
@media (max-width:640px){.dlnav .w{padding:12px 16px}}
.dlnav nav a[aria-current]{color:#a9532c}
.bjs .rv{opacity:0;transform:translateY(16px);transition:opacity .5s ease,transform .5s ease}
.bjs .rv.on{opacity:1;transform:none}
.bjs figure.rv{transform:none;clip-path:inset(0 100% 0 0);opacity:1;transition:clip-path 1.1s cubic-bezier(.2,.7,.2,1)}
.bjs figure.rv.on{clip-path:inset(0 0 0 0)}
.bjs .hero>*{animation:bai-len .6s ease both}
.bjs .hero>*:nth-child(2){animation-delay:.06s}.bjs .hero>*:nth-child(3){animation-delay:.12s}.bjs .hero>*:nth-child(4){animation-delay:.18s}
.bjs .bia img{animation:bai-bia 1.2s ease both}
@keyframes bai-len{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
@keyframes bai-bia{from{opacity:0;transform:scale(1.03)}to{opacity:1;transform:none}}
.bjs .nhanh li{opacity:0;transform:translateX(-10px);transition:opacity .4s ease,transform .4s ease}
.bjs .nhanh.on li{opacity:1;transform:none}
.bjs .nhanh.on li:nth-child(2){transition-delay:.15s}.bjs .nhanh.on li:nth-child(3){transition-delay:.3s}.bjs .nhanh.on li:nth-child(4){transition-delay:.45s}
.bjs tbody tr{opacity:0;transition:opacity .4s ease}
.bjs .rv.on tbody tr{opacity:1}
.bjs .rv.on tbody tr:nth-child(2){transition-delay:.08s}.bjs .rv.on tbody tr:nth-child(3){transition-delay:.16s}.bjs .rv.on tbody tr:nth-child(4){transition-delay:.24s}.bjs .rv.on tbody tr:nth-child(5){transition-delay:.32s}.bjs .rv.on tbody tr:nth-child(n+6){transition-delay:.4s}
main h2:not(.faq h2){position:relative}
main h2:not(.faq h2)::before{content:"";position:absolute;left:0;top:-2px;height:3px;width:0;background:var(--dat);transition:width .8s ease}
main h2.on::before{width:56px}
.bjs .chao.rv.on,.bjs .cta.rv.on{animation:bai-nhay 1.2s ease .4s 1}
@keyframes bai-nhay{50%{box-shadow:0 0 0 4px rgba(201,106,63,.18)}}
@media (prefers-reduced-motion:reduce){.bjs .rv,.bjs figure.rv,.bjs .nhanh li,.bjs tbody tr{opacity:1!important;transform:none!important;clip-path:none!important;transition:none!important}.bjs .hero>*,.bjs .bia img{animation:none}}