/* ===================================================================
   PT HOME — Nội thất gỗ công nghiệp Việt Trì, Phú Thọ
   Ngôn ngữ thiết kế: kem ấm · gỗ espresso · đồng vàng
   =================================================================== */

:root{
  /* màu */
  --nen:#FCFBF9;
  --nen-2:#F2EDE6;
  --trang:#FFFFFF;
  --rung:#14110E;
  --rung-2:#2A231C;
  --rung-3:#6B5B49;
  --dong:#B08A4A;
  --dong-sang:#D8B478;
  --muc:#14110E;
  --muc-2:#5C544B;
  --muc-3:#8E857A;
  --vien:#E6E0D6;
  --vien-dam:#CFC5B6;

  /* chữ */
  --serif:"Cormorant Garamond",Georgia,"Times New Roman",serif;
  --sans:"Be Vietnam Pro","Segoe UI",-apple-system,BlinkMacSystemFont,Roboto,sans-serif;

  /* nhịp */
  --r:0px;
  --r-to:0px;
  --chuyen:.45s cubic-bezier(.22,.61,.36,1);
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:110px;-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--nen);color:var(--muc);
  font-family:var(--sans);font-size:17px;font-weight:300;line-height:1.8;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
img,svg{max-width:100%;display:block}
a{color:var(--rung-2);text-decoration-thickness:1px;text-underline-offset:4px}
a:hover{color:var(--dong)}

h1,h2,h3,h4{font-family:var(--serif);font-weight:400;line-height:1.1;letter-spacing:-.012em;margin:0 0 .5em;color:var(--muc)}
h1{font-size:clamp(2.5rem,1.3rem + 4.6vw,4.9rem)}
h2{font-size:clamp(1.85rem,1.2rem + 2.4vw,3.05rem)}
h3{font-size:1.36rem;letter-spacing:-.005em}
p{margin:0 0 1.15em}

.bao{width:min(1180px,100% - 3rem);margin-inline:auto}
.bao--hep{width:min(880px,100% - 3rem);margin-inline:auto}
.an{display:none}
.giua{text-align:center}

/* nhãn nhỏ chữ giãn — chi tiết đặc trưng của bộ nhận diện */
.chu-nho{
  font-family:var(--sans);font-size:.68rem;font-weight:500;
  letter-spacing:.26em;text-transform:uppercase;color:var(--dong);
}
.gach-nho{display:flex;align-items:center;gap:.9rem;margin-bottom:1.1rem}
.gach-nho::after{content:"";flex:0 0 46px;height:1px;background:var(--vien-dam)}
.khoi__dau--giua .gach-nho{justify-content:center}
.khoi__dau--giua .gach-nho::before{content:"";flex:0 0 46px;height:1px;background:var(--vien-dam)}

.bo-qua{position:absolute;left:-999px;top:0;background:var(--rung);color:#fff;padding:.8rem 1.1rem;z-index:99}
.bo-qua:focus{left:10px;top:10px}
:focus-visible{outline:1.5px solid var(--dong);outline-offset:3px}
::selection{background:var(--rung);color:#fff}

/* ---------------------------------------------------------- nút */
.nut{
  display:inline-flex;align-items:center;justify-content:center;gap:.6rem;
  padding:1.05rem 2.2rem;border-radius:var(--r);border:1px solid var(--rung);
  background:var(--rung);color:#fff;text-decoration:none;
  font-family:var(--sans);font-size:.76rem;font-weight:500;letter-spacing:.17em;text-transform:uppercase;
  transition:background var(--chuyen),color var(--chuyen),border-color var(--chuyen);
  white-space:nowrap;
}
.nut:hover{background:var(--muc);border-color:var(--muc);color:#fff}
.nut--vien{background:transparent;color:var(--rung);border-color:var(--vien-dam)}
.nut--vien:hover{background:transparent;border-color:var(--rung);color:var(--rung)}
.nut--dong{background:var(--dong);border-color:var(--dong);color:#fff}
.nut--dong:hover{background:#8C6733;border-color:#8C6733}
.nut--nho{padding:.62rem 1.25rem;font-size:.76rem}
.nut--rong{display:flex;width:100%;margin-bottom:.55rem}
.nut svg{width:15px;height:15px;stroke-width:1.5}

/* liên kết có mũi tên */
.lien-mui{
  display:inline-flex;align-items:center;gap:.55rem;text-decoration:none;
  font-size:.83rem;font-weight:500;letter-spacing:.1em;text-transform:uppercase;color:var(--rung-2);
}
.lien-mui::after{content:"";width:22px;height:1px;background:currentColor;transition:width var(--chuyen)}
.lien-mui:hover::after{width:34px}

/* ------------------------------------------------------- đỉnh */
.dinh{
  position:sticky;top:0;z-index:50;background:rgba(252,251,249,.92);
  backdrop-filter:blur(14px);border-bottom:1px solid var(--vien);
}
.dinh__trong{display:flex;align-items:center;justify-content:space-between;gap:1.5rem;min-height:86px}
.hieu{display:flex;align-items:center;gap:.85rem;text-decoration:none;color:var(--muc)}
.hieu__dau{flex:0 0 auto;width:38px;height:38px}
.hieu__ten{font-family:var(--serif);font-size:1.16rem;line-height:1.15;letter-spacing:.01em}
.hieu__ten em{font-style:normal;color:var(--rung-2)}
.hieu__phu{display:block;font-family:var(--sans);font-size:.62rem;font-weight:400;
  letter-spacing:.2em;text-transform:uppercase;color:var(--muc-3);margin-top:.3rem}
.dieu-huong{display:flex;align-items:center;gap:.3rem}
.dieu-huong a{
  padding:.55rem .95rem;text-decoration:none;color:var(--muc-2);
  font-size:.9rem;font-weight:400;position:relative;transition:color var(--chuyen);
}
.dieu-huong a::after{
  content:"";position:absolute;left:.95rem;right:.95rem;bottom:.32rem;height:1px;
  background:var(--dong);transform:scaleX(0);transform-origin:left;transition:transform var(--chuyen);
}
.dieu-huong a:hover{color:var(--muc)}
.dieu-huong a:hover::after{transform:scaleX(1)}
.dieu-huong a.nut{color:#fff;margin-left:.7rem}
.dieu-huong a.nut::after{display:none}
.dieu-huong a.nut.nut--vien{color:var(--rung)}
.nut-menu{display:none}

/* ------------------------------------------------------ banner */
.banner{position:relative;overflow:hidden;background:var(--nen);
  padding:clamp(3.6rem,8vw,7rem) 0 clamp(3rem,6vw,5rem)}
.banner::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(720px 460px at 82% 8%, rgba(66,107,89,.10), transparent 68%),
    radial-gradient(520px 380px at 6% 92%, rgba(160,120,63,.07), transparent 70%);
}
.banner__trong{position:relative;max-width:900px}
.banner h1{margin-bottom:.6em}
.banner h1 em{font-style:italic;color:var(--rung-2)}
.banner__mo{font-size:1.09rem;color:var(--muc-2);max-width:60ch;font-weight:300}
.banner__nut{display:flex;flex-wrap:wrap;gap:.9rem;margin:2.2rem 0 0}

.cot-diem{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  gap:2.4rem;margin-top:clamp(3rem,6vw,4.5rem);padding-top:2.6rem;border-top:1px solid var(--vien);
}
.cot-diem div{display:flex;gap:1rem;align-items:flex-start}
.cot-diem span.so{font-family:var(--serif);font-size:.95rem;color:var(--dong);padding-top:.15rem}
.cot-diem p{margin:0;font-size:.95rem;color:var(--muc-2)}
.cot-diem strong{display:block;font-weight:500;color:var(--muc);margin-bottom:.15rem}

/* ------------------------------------------------------ khối */
.khoi{padding:clamp(3.4rem,7vw,6rem) 0}
.khoi__dau{max-width:640px;margin-bottom:3rem}
.khoi__dau--giua{margin-inline:auto;text-align:center}
.khoi__dau p{color:var(--muc-2);margin:0;font-weight:300}
.luoi{display:grid;gap:0}
.luoi--3{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}
.luoi--2{grid-template-columns:repeat(auto-fit,minmax(340px,1fr))}
.luoi--4{grid-template-columns:repeat(auto-fit,minmax(210px,1fr))}

/* ------------------------------------------------- thẻ dịch vụ */
.the--dv{
  display:block;position:relative;padding:2.4rem 2.1rem 2.6rem;text-decoration:none;color:inherit;
  border-right:1px solid var(--vien);border-bottom:1px solid var(--vien);
  transition:background var(--chuyen);
}
.the--dv:hover{background:var(--trang)}
.the--dv .so-tt{
  position:absolute;top:1.7rem;right:1.9rem;font-family:var(--serif);font-size:.9rem;
  color:var(--vien-dam);letter-spacing:.05em;
}
.the--dv .bt{width:30px;height:30px;stroke:var(--rung-3);stroke-width:1.15;fill:none;margin-bottom:1.4rem}
.the--dv h3{font-size:1.24rem;margin-bottom:.5rem;transition:color var(--chuyen)}
.the--dv:hover h3{color:var(--rung-2)}
.the--dv p{color:var(--muc-2);font-size:.94rem;font-weight:300;margin:0}
.the--dv .lien-mui{margin-top:1.5rem}

/* ----------------------------------------------------- thẻ bài */
.the--bai{border-top:1px solid var(--vien);transition:background var(--chuyen)}
.the--bai:hover{background:var(--trang)}
.the--bai a{display:block;padding:2rem 1.9rem 2.2rem;text-decoration:none;color:inherit;height:100%}
.the--bai h3{font-size:1.2rem;margin:.9rem 0 .55rem;transition:color var(--chuyen)}
.the--bai:hover h3{color:var(--rung-2)}
.the--bai p{color:var(--muc-2);font-size:.92rem;font-weight:300;margin:0}
.the__meta{display:block;margin-top:1.3rem;font-size:.74rem;letter-spacing:.13em;
  text-transform:uppercase;color:var(--muc-3)}
.nhan{font-size:.68rem;letter-spacing:.19em;text-transform:uppercase;color:var(--dong);font-weight:500}

/* ------------------------------------------------- dải tương phản */
.dai-toi{background:var(--rung);color:#EFEAE0;padding:clamp(3.6rem,7vw,6rem) 0}
.dai-toi h2,.dai-toi h3{color:#fff}
.dai-toi .chu-nho{color:var(--dong-sang)}
.dai-toi .gach-nho::before,.dai-toi .gach-nho::after{background:rgba(255,255,255,.26)}
.dai-toi p{color:rgba(239,234,224,.8);font-weight:300}
.tru{padding:2.2rem 2rem;border-left:1px solid rgba(255,255,255,.16)}
.tru:first-child{border-left:0;padding-left:0}
.tru .bt{width:28px;height:28px;stroke:var(--dong-sang);stroke-width:1.15;fill:none;margin-bottom:1.3rem}
.tru h3{font-size:1.18rem;margin-bottom:.5rem}
.tru p{font-size:.93rem;margin:0}

.dai-so{background:var(--nen-2);padding:clamp(2.8rem,5vw,4rem) 0}
.so-lieu div{text-align:center;padding:1.2rem .8rem;border-left:1px solid var(--vien-dam)}
.so-lieu div:first-child{border-left:0}
.so-lieu strong{display:block;font-family:var(--serif);font-size:2.5rem;font-weight:500;color:var(--rung-2);line-height:1}
.so-lieu span{display:block;margin-top:.7rem;font-size:.74rem;letter-spacing:.14em;
  text-transform:uppercase;color:var(--muc-3)}

/* ------------------------------------------------------ bài viết */
.bai{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:4.5rem;
  padding:2.5rem 0 5rem;align-items:start}
.bai--rong{grid-template-columns:minmax(0,1fr)}
.bai--rong .bai__than{max-width:760px}
.bai__than{min-width:0;max-width:74ch}
.bai__than h1{margin-bottom:.45em}
.bai__meta{font-size:.74rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muc-3);margin-bottom:1.6rem}
.bai__mo{font-family:var(--serif);font-size:1.25rem;line-height:1.62;color:var(--muc-2);
  font-weight:400;margin-bottom:2rem;padding-bottom:2rem;border-bottom:1px solid var(--vien)}
.bai__than h2{margin-top:2.8rem;font-size:1.62rem}
.bai__than h3{margin-top:1.9rem;font-size:1.15rem;font-family:var(--sans);font-weight:600;letter-spacing:0}
.bai__than ul,.bai__than ol{padding-left:1.15rem;margin-bottom:1.3rem}
.bai__than li{margin-bottom:.5rem}
.bai__than li::marker{color:var(--dong)}
.bai__than blockquote{
  margin:2rem 0;padding:.2rem 0 .2rem 1.8rem;border-left:2px solid var(--dong);
  font-family:var(--serif);font-size:1.16rem;line-height:1.62;color:var(--muc-2);font-style:italic;
}
.bai__than blockquote p:last-child{margin:0}
.bai__than hr{border:0;height:1px;background:var(--vien);margin:2.8rem 0}
.bai__than code{background:var(--nen-2);padding:.12em .45em;border-radius:var(--r);font-size:.9em}
.bai__than strong{font-weight:600}

.bang-boc{overflow-x:auto;margin:1.9rem 0}
table{border-collapse:collapse;width:100%;font-size:.92rem;min-width:440px}
th,td{padding:.9rem 1.1rem;text-align:left;border-bottom:1px solid var(--vien)}
th{font-family:var(--sans);font-size:.72rem;font-weight:600;letter-spacing:.13em;
  text-transform:uppercase;color:var(--muc-2);border-bottom:1px solid var(--vien-dam)}
td{font-weight:300;color:var(--muc-2)}
td:first-child{color:var(--muc);font-weight:400}
tbody tr:last-child td{border-bottom:1px solid var(--vien)}

.muc-luc{border-top:1px solid var(--vien);border-bottom:1px solid var(--vien);
  padding:1.6rem 0;margin:2rem 0 2.6rem}
.muc-luc p{margin:0 0 .9rem}
.muc-luc ol{margin:0;padding:0;list-style:none;counter-reset:ml;
  columns:2;column-gap:2.4rem}
.muc-luc li{counter-increment:ml;margin-bottom:.45rem;font-size:.9rem;break-inside:avoid}
.muc-luc li::before{content:counter(ml,decimal-leading-zero);color:var(--dong);
  font-family:var(--serif);font-size:.78rem;margin-right:.6rem}
.muc-luc a{text-decoration:none;color:var(--muc-2)}
.muc-luc a:hover{color:var(--dong)}

/* hộp ghi chú */
.hop{margin:2rem 0;padding:1.6rem 1.9rem;background:var(--nen-2);border-left:2px solid var(--rung-3)}
.hop--luuy{border-left-color:var(--dong)}
.hop--tien{border-left-color:var(--dong)}
.hop__ten{display:block;font-size:.68rem;letter-spacing:.19em;text-transform:uppercase;
  color:var(--dong);font-weight:500;margin-bottom:.7rem}
.hop p{margin-bottom:.7rem;font-size:.96rem}
.hop p:last-child{margin:0}
.hop ul,.hop ol{margin:0;font-size:.96rem}

/* cột bên */
.bai__ben{position:sticky;top:110px;display:grid;gap:2.4rem}
.hop-lien-he{background:var(--rung);color:#EFEAE0;padding:2rem 1.8rem}
.hop-lien-he .chu-nho{color:var(--dong-sang)}
.hop-lien-he h2{font-size:1.28rem;color:#fff;margin:.7rem 0 .5rem}
.hop-lien-he p{font-size:.92rem;color:rgba(239,234,224,.78);font-weight:300;margin-bottom:1.4rem}
.hop-lien-he .nut{background:transparent;border-color:rgba(255,255,255,.32);color:#fff}
.hop-lien-he .nut:hover{background:#fff;border-color:#fff;color:var(--rung)}
.hop-khac h2{font-size:.72rem;font-family:var(--sans);font-weight:500;letter-spacing:.19em;
  text-transform:uppercase;color:var(--dong);margin-bottom:1.1rem}
.hop-khac ul{list-style:none;margin:0;padding:0}
.hop-khac li{border-top:1px solid var(--vien);padding:.85rem 0}
.hop-khac li:last-child{border-bottom:1px solid var(--vien)}
.hop-khac a{text-decoration:none;font-size:.93rem;color:var(--muc-2);font-weight:300;
  display:block;transition:color var(--chuyen)}
.hop-khac a:hover{color:var(--dong)}

/* vụn đường & lọc */
.vun ol{list-style:none;display:flex;flex-wrap:wrap;gap:.55rem;padding:0;margin:0 0 2rem;
  font-size:.72rem;letter-spacing:.11em;text-transform:uppercase;color:var(--muc-3)}
.vun li+li::before{content:"—";margin-right:.55rem;color:var(--vien-dam)}
.vun a{text-decoration:none;color:var(--muc-3)}
.vun a:hover{color:var(--dong)}

.loc{display:flex;flex-wrap:wrap;gap:2rem;margin:0 0 .5rem;padding-bottom:1.4rem}
.loc__nut{
  background:none;border:0;padding:0 0 .4rem;font:inherit;font-size:.8rem;font-weight:400;
  letter-spacing:.13em;text-transform:uppercase;color:var(--muc-3);cursor:pointer;
  border-bottom:1px solid transparent;transition:color var(--chuyen),border-color var(--chuyen);
}
.loc__nut:hover{color:var(--muc)}
.loc__nut.dang-chon{color:var(--rung-2);border-bottom-color:var(--dong)}

/* --------------------------------------------------- gọi cuối */
.goi-cuoi{background:var(--rung);color:#EFEAE0;padding:clamp(3.4rem,6vw,5rem) 0}
.goi-cuoi__trong{display:flex;flex-wrap:wrap;gap:2.5rem;align-items:center;justify-content:space-between}
.goi-cuoi .chu-nho{color:var(--dong-sang)}
.goi-cuoi h2{color:#fff;margin:.9rem 0 .5rem;max-width:18ch}
.goi-cuoi p{max-width:48ch;color:rgba(239,234,224,.8);font-weight:300;margin:0}
.goi-cuoi__nut{display:flex;flex-wrap:wrap;gap:.9rem}
.goi-cuoi .nut{background:#fff;border-color:#fff;color:var(--rung)}
.goi-cuoi .nut:hover{background:var(--dong-sang);border-color:var(--dong-sang);color:var(--rung)}
.goi-cuoi .nut--vien{background:transparent;border-color:rgba(255,255,255,.34);color:#fff}
.goi-cuoi .nut--vien:hover{background:transparent;border-color:#fff;color:#fff}

/* ------------------------------------------------------- chân */
.chan{background:var(--muc);color:rgba(239,234,224,.72);padding:clamp(3rem,5vw,4.4rem) 0 1.6rem;
  font-size:.9rem;font-weight:300}
.chan__luoi{display:grid;grid-template-columns:1.5fr 1fr 1.1fr 1.2fr;gap:2.6rem}
.chan h3{font-size:.7rem;font-family:var(--sans);font-weight:500;letter-spacing:.19em;
  text-transform:uppercase;color:var(--dong-sang);margin-bottom:1.2rem}
.chan__hieu{display:flex;align-items:center;gap:.8rem;margin-bottom:1.2rem}
.chan__hieu span{font-family:var(--serif);font-size:1.15rem;color:#fff}
.chan__nho{font-size:.8rem;color:rgba(239,234,224,.5);margin-top:1.1rem}
.chan__ds{list-style:none;margin:0;padding:0}
.chan__ds li{margin-bottom:.6rem}
.chan__ds a{color:rgba(239,234,224,.72);text-decoration:none;transition:color var(--chuyen)}
.chan__ds a:hover{color:var(--dong-sang)}
.chan__day{display:flex;flex-wrap:wrap;justify-content:space-between;gap:.8rem;
  border-top:1px solid rgba(255,255,255,.11);margin-top:3rem;padding-top:1.5rem;
  font-size:.76rem;letter-spacing:.08em;color:rgba(239,234,224,.45)}
.chan__day p{margin:0}
.chan__day a{color:rgba(239,234,224,.45);text-decoration:none}
.chan__day a:hover{color:var(--dong-sang)}

/* ------------------------------------------- thanh gọi (mobile) */
.goi-noi{
  position:fixed;left:0;right:0;bottom:0;z-index:60;display:none;
  align-items:center;justify-content:center;gap:.6rem;
  background:var(--rung);color:#fff;text-decoration:none;padding:1rem;
  font-size:.78rem;letter-spacing:.16em;text-transform:uppercase;
}
.goi-noi svg{width:15px;height:15px;stroke:currentColor;stroke-width:1.6;fill:none}

/* ------------------------------------------------- responsive */
@media (max-width:1080px){
  .bai{grid-template-columns:minmax(0,1fr) 270px;gap:3rem}
}
@media (max-width:920px){
  .bai{grid-template-columns:1fr;gap:2.5rem}
  .bai__ben{position:static;grid-template-columns:1fr 1fr;display:grid;gap:2rem}
  .chan__luoi{grid-template-columns:1fr 1fr;gap:2.5rem}
  .tru{border-left:0;padding:1.6rem 0;border-top:1px solid rgba(255,255,255,.16)}
  .tru:first-child{border-top:0;padding-top:0}
  .so-lieu div{border-left:0}
}
@media (max-width:760px){
  body{font-size:16px;padding-bottom:3.4rem}
  .bao,.bao--hep{width:min(100% - 2.2rem,1180px)}
  .muc-luc ol{columns:1}
  .bai__ben{grid-template-columns:1fr}
  .chan__luoi{grid-template-columns:1fr}
  .goi-noi{display:flex}
  .the--dv,.the--bai a{padding-inline:0}
  .the--dv{border-right:0}
  .the--dv .so-tt{right:0}
  .goi-cuoi__trong{flex-direction:column;align-items:flex-start}
  .nut-menu{
    display:flex;flex-direction:column;justify-content:center;gap:5px;
    width:42px;height:42px;padding:0 8px;border:1px solid var(--vien-dam);cursor:pointer;background:none;
  }
  .nut-menu span{display:block;height:1px;background:var(--muc);transition:var(--chuyen)}
  .nut-menu span:nth-child(2){width:70%}
  .dieu-huong{
    display:none;position:absolute;left:0;right:0;top:100%;background:var(--nen);
    border-bottom:1px solid var(--vien);flex-direction:column;align-items:stretch;
    padding:1rem 1.1rem 1.6rem;gap:0;
  }
  #mo-menu:checked ~ .dieu-huong{display:flex}
  .dieu-huong a{padding:.95rem .3rem;border-bottom:1px solid var(--vien);font-size:1rem}
  .dieu-huong a::after{display:none}
  .dieu-huong a.nut{margin:1.1rem 0 0;justify-content:center;border-bottom:1px solid var(--rung)}
  .cot-diem{gap:1.6rem}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto}}
@media print{.dinh,.goi-cuoi,.goi-noi,.bai__ben,.loc,.chan{display:none}}

/* ô mời liên hệ khép lưới dịch vụ */
.the--dv-cta{background:var(--nen-2)}
.the--dv-cta:hover{background:var(--rung);color:#EFEAE0}
.the--dv-cta:hover h3{color:#fff}
.the--dv-cta:hover p{color:rgba(239,234,224,.78)}
.the--dv-cta:hover .so-tt{color:rgba(255,255,255,.3)}
.the--dv-cta h3{margin-top:3.2rem}

/* ---------- video dọc ---------- */
.video{margin:2.2rem 0 2.6rem;padding:0}
.video__khung{background:var(--muc);display:flex;justify-content:center;padding:1.2rem}
.video video{width:100%;max-width:330px;height:auto;display:block;background:#000}
.video figcaption{margin-top:.85rem;font-size:.88rem;color:var(--muc-3);
  border-left:2px solid var(--dong);padding-left:.9rem;font-weight:300}
@media (max-width:760px){
  .video__khung{padding:.8rem}
  .video video{max-width:100%}
}

/* ---------- thư viện video ---------- */
.luoi-video{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:1px;
  background:var(--vien);border:1px solid var(--vien)}
.the-video{background:var(--nen);display:flex;flex-direction:column}
.the-video__khung{background:var(--muc);display:flex;justify-content:center;padding:1.1rem}
.the-video video{width:100%;max-width:250px;height:auto;display:block;background:#000}
.the-video__chu{padding:1.5rem 1.6rem 1.8rem;display:flex;flex-direction:column;flex:1}
.the-video__chu h2{font-size:1.14rem;margin:.6rem 0 .5rem}
.the-video__chu p{font-size:.93rem;color:var(--muc-2);font-weight:300;margin:0}
.the-video__meta{font-family:var(--sans);font-size:.72rem;letter-spacing:.13em;text-transform:uppercase;
  color:var(--muc-3);margin-top:.9rem!important}
.the-video .lien-mui{margin-top:auto;padding-top:1.2rem}
@media (max-width:760px){
  .the-video video{max-width:100%}
}

/* ---- Khối liên hệ cuối bài viết ---- */
.lh-bai{margin:3.5rem 0 0;padding:2rem 1.75rem;border:1px solid var(--vien);background:var(--nen-2);border-radius:2px}
.lh-bai h2{margin:.35rem 0 .75rem;font-size:1.45rem}
.lh-bai__mo{margin:0 0 1.25rem;color:var(--muc-2)}
.lh-bai__tt{margin:0 0 1.5rem;display:grid;gap:.65rem}
.lh-bai__tt > div{display:grid;grid-template-columns:9.5rem 1fr;gap:.5rem 1rem;align-items:baseline}
.lh-bai__tt dt{font-size:.74rem;letter-spacing:.09em;text-transform:uppercase;color:var(--muc-3);margin:0}
.lh-bai__tt dd{margin:0}
.lh-bai__nut{display:flex;flex-wrap:wrap;gap:.75rem;margin:0}
@media (max-width:640px){
  .lh-bai{padding:1.5rem 1.15rem}
  .lh-bai__tt > div{grid-template-columns:1fr;gap:.15rem}
}

/* ---- Ảnh minh hoạ đầu bài viết ---- */
.anh-bai{margin:1.75rem 0 2rem;border:1px solid var(--vien);border-radius:2px;overflow:hidden;background:var(--nen-2)}
.anh-bai img{display:block;width:100%;height:auto}

/* ===================================================================
   PT HOME — khối riêng: thư viện công trình, quy trình, nút liên hệ nổi
   =================================================================== */

/* --- lưới thẻ công trình --- */
.luoi-da{display:grid;gap:1.6rem;grid-template-columns:repeat(auto-fill,minmax(310px,1fr))}
.luoi-da--nho{grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:1.1rem;margin-top:1.4rem}

.the-da{
  display:block;background:var(--trang);border:1px solid var(--vien);
  border-radius:var(--r-to);overflow:hidden;text-decoration:none;color:inherit;
  transition:border-color var(--chuyen),transform var(--chuyen),box-shadow var(--chuyen);
}
.the-da:hover{border-color:var(--dong);transform:translateY(-3px);box-shadow:0 14px 34px rgba(42,33,25,.11)}
.the-da__anh{display:block;aspect-ratio:4/3;overflow:hidden;background:var(--nen-2)}
.the-da__anh img{width:100%;height:100%;object-fit:cover;transition:transform .6s cubic-bezier(.22,.61,.36,1)}
.the-da:hover .the-da__anh img{transform:scale(1.045)}
.the-da__chu{display:block;padding:1.15rem 1.3rem 1.35rem}
.the-da__chu strong{display:block;font-family:var(--serif);font-size:1.16rem;font-weight:500;line-height:1.28;margin:.45rem 0 .4rem;color:var(--muc)}
.the-da__meta{display:block;font-size:.85rem;color:var(--muc-3)}
.the-da .nhan{
  display:inline-block;font-size:.68rem;font-weight:500;letter-spacing:.14em;
  text-transform:uppercase;color:var(--dong);
}
.luoi-da--nho .the-da__chu{padding:.85rem 1rem 1.05rem}
.luoi-da--nho .the-da__chu strong{font-size:1rem}

.khoi-da-nho{margin:3rem 0 1rem}
.khoi-da-nho h2{font-size:1.45rem}

/* --- bảng thông tin công trình --- */
.da-tt{
  display:grid;gap:0;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));
  margin:2rem 0 2.6rem;border-top:1px solid var(--vien);
}
.da-tt>div{padding:1.05rem 1.2rem 1.05rem 0;border-bottom:1px solid var(--vien)}
.da-tt dt{
  font-size:.7rem;font-weight:500;letter-spacing:.16em;text-transform:uppercase;
  color:var(--muc-3);margin-bottom:.3rem;
}
.da-tt dd{margin:0;font-size:.98rem;color:var(--muc);line-height:1.5}

/* --- thư viện ảnh trong trang công trình --- */
.thu-vien{display:grid;gap:1.1rem;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));margin:2.4rem 0 1rem}
.thu-vien figure{margin:0;border-radius:var(--r-to);overflow:hidden;background:var(--nen-2);border:1px solid var(--vien)}
.thu-vien img{width:100%;height:100%;aspect-ratio:4/3;object-fit:cover}
.thu-vien figure:first-child{grid-column:1/-1}
.thu-vien figure:first-child img{aspect-ratio:16/9}

/* --- ảnh đầu bài / đầu trang dịch vụ --- */
.anh-bai{margin:1.8rem 0 2.2rem;border-radius:var(--r-to);overflow:hidden;border:1px solid var(--vien)}
.anh-bai img{width:100%;height:auto;aspect-ratio:3/2;object-fit:cover}

/* --- quy trình 5 bước --- */
.quy-trinh{
  list-style:none;margin:0;padding:0;display:grid;gap:1.3rem;
  grid-template-columns:repeat(auto-fit,minmax(200px,1fr));
}
.quy-trinh li{
  position:relative;padding:1.7rem 1.4rem 1.5rem;background:var(--trang);
  border:1px solid var(--vien);border-radius:var(--r-to);
}
.qt__so{
  display:flex;align-items:center;justify-content:center;
  width:34px;height:34px;border-radius:50%;
  background:var(--rung);color:#fff;
  font-family:var(--serif);font-size:1.02rem;line-height:1;margin-bottom:.95rem;
}
.quy-trinh h3{font-size:1.1rem;margin-bottom:.5rem}
.quy-trinh p{margin:0;font-size:.94rem;color:var(--muc-2);line-height:1.66}

/* --- cụm nút liên hệ nổi (Zalo + Gọi) --- */
.lien-he-noi{
  position:fixed;right:18px;bottom:18px;z-index:900;
  display:flex;flex-direction:column;gap:11px;align-items:flex-end;
}
.lhn{
  display:flex;align-items:center;gap:.5rem;text-decoration:none;
  border-radius:999px;color:#fff;font-size:.93rem;font-weight:500;line-height:1;
  padding:.82rem 1.15rem;box-shadow:0 6px 20px rgba(28,23,19,.26);
  transition:transform var(--chuyen),box-shadow var(--chuyen);
}
.lhn:hover{transform:translateY(-2px);color:#fff;box-shadow:0 10px 26px rgba(28,23,19,.32)}
.lhn svg{width:19px;height:19px;flex:none;fill:currentColor}
.lhn--zalo{background:#0068FF}
.lhn--goi{background:var(--rung)}
@media(max-width:600px){
  .lien-he-noi{right:11px;bottom:11px;gap:9px}
  .lhn{font-size:.87rem;padding:.75rem 1rem}
  .thu-vien figure:first-child img{aspect-ratio:4/3}
}

/* khoảng trống dưới cùng để nút nổi không che nội dung chân trang */
.chan__day{padding-bottom:4.6rem}

/* --- logo PT HOME: cố định kích thước ở cả đỉnh trang và chân trang --- */
.logo{flex:0 0 auto;width:38px;height:38px}
.chan__hieu .logo{width:30px;height:30px;color:#fff}


/* ===================================================================
   PT HOME · LỚP HIỆN ĐẠI — SANG TRỌNG
   Ảnh bìa tối toàn màn · đỉnh trang trong suốt · chữ lớn, nhiều khoảng thở
   =================================================================== */

/* ---------- đỉnh trang: trong suốt trên ảnh bìa, đặc lại khi cuộn ---------- */
body.co-bia .dinh{
  position:fixed;left:0;right:0;top:0;
  background:transparent;backdrop-filter:none;border-bottom:1px solid rgba(255,255,255,.14);
  transition:background var(--chuyen),border-color var(--chuyen),backdrop-filter var(--chuyen);
}
body.co-bia .dinh .hieu,
body.co-bia .dinh .hieu__ten,
body.co-bia .dinh .dieu-huong a{color:#fff}
body.co-bia .dinh .hieu__ten em{color:var(--dong-sang)}
body.co-bia .dinh .hieu__phu{color:rgba(255,255,255,.62)}
body.co-bia .dinh .nut{background:transparent;border-color:rgba(255,255,255,.45);color:#fff}
body.co-bia .dinh .nut:hover{background:#fff;border-color:#fff;color:var(--muc)}
body.co-bia .dinh .nut-menu{border-color:rgba(255,255,255,.4)}
body.co-bia .dinh .nut-menu span{background:#fff}

body.co-bia .dinh--dac{
  background:rgba(20,17,14,.9);backdrop-filter:blur(16px) saturate(140%);
  border-bottom-color:rgba(255,255,255,.1);
}

/* ---------- ảnh bìa tối toàn màn ---------- */
.banner--bia{
  position:relative;min-height:min(92vh,880px);display:flex;align-items:flex-end;
  padding:clamp(7rem,16vh,11rem) 0 clamp(3.4rem,8vh,5.4rem);
  background:var(--muc);overflow:hidden;isolation:isolate;
}
.banner--bia::before{content:none}
.banner__nen{position:absolute;inset:0;z-index:-2;margin:0}
.banner__nen img{width:100%;height:100%;object-fit:cover;display:block}
.banner--bia::after{
  content:"";position:absolute;inset:0;z-index:-1;
  background:
    linear-gradient(to right, rgba(10,8,6,.88) 0%, rgba(10,8,6,.72) 42%, rgba(10,8,6,.30) 78%, rgba(10,8,6,.22) 100%),
    linear-gradient(to top, rgba(10,8,6,.86) 0%, rgba(10,8,6,.42) 38%, rgba(10,8,6,.20) 66%, rgba(10,8,6,.62) 100%);
}
/* trên điện thoại chữ tràn ngang nên phủ đều thay vì phủ lệch trái */
@media(max-width:760px){
  .banner--bia::after{
    background:linear-gradient(to top, rgba(10,8,6,.92) 0%, rgba(10,8,6,.76) 42%, rgba(10,8,6,.5) 72%, rgba(10,8,6,.66) 100%);
  }
}
/* chữ trên ảnh: thêm bóng rất nhẹ để luôn đọc được dù ảnh sáng */
.banner--bia h1,
.banner--bia .banner__mo{text-shadow:0 1px 26px rgba(8,6,4,.5)}
.banner--bia .banner__trong{max-width:1000px;color:#fff}
.banner--bia h1{color:#fff;margin-bottom:.42em;text-wrap:balance}
.banner--bia h1 em{font-style:italic;color:var(--dong-sang)}
.banner--bia .chu-nho{color:var(--dong-sang)}
.banner--bia .gach-nho::after{background:rgba(255,255,255,.4)}
.banner--bia .banner__mo{
  color:rgba(255,255,255,.86);font-size:clamp(1.02rem,.94rem + .4vw,1.2rem);
  max-width:56ch;font-weight:300;
}
.banner--bia .banner__nut{margin-top:2.6rem}
.banner--bia .nut{background:#fff;border-color:#fff;color:var(--muc)}
.banner--bia .nut:hover{background:var(--dong-sang);border-color:var(--dong-sang);color:var(--muc)}
.banner--bia .nut--vien{background:transparent;border-color:rgba(255,255,255,.5);color:#fff}
.banner--bia .nut--vien:hover{background:rgba(255,255,255,.1);border-color:#fff;color:#fff}

/* ---------- dải 3 điểm mạnh ngay dưới ảnh bìa ---------- */
.dai-diem{background:var(--muc);color:rgba(255,255,255,.78);padding:0 0 clamp(2.6rem,5vw,3.8rem)}
.dai-diem .cot-diem{
  margin-top:0;padding-top:2.8rem;border-top:1px solid rgba(255,255,255,.14);gap:2.8rem;
}
.dai-diem .cot-diem span.so{color:var(--dong-sang);font-size:1rem}
.dai-diem .cot-diem strong{color:#fff;font-weight:400;font-size:1.02rem;margin-bottom:.35rem}
.dai-diem .cot-diem p{color:rgba(255,255,255,.66);font-size:.93rem;line-height:1.7}

/* ---------- tiêu đề khối: to hơn, thoáng hơn ---------- */
.khoi{padding:clamp(4.2rem,9vw,8rem) 0}
.khoi__dau{max-width:700px;margin-bottom:3.6rem}
.khoi__dau p{font-size:1.04rem;line-height:1.75}

/* ---------- thẻ dịch vụ: đường kẻ mảnh, gạch đồng khi rê chuột ---------- */
.the--dv{padding:2.9rem 2.4rem 3rem;overflow:hidden}
.the--dv::after{
  content:"";position:absolute;left:0;bottom:-1px;width:0;height:1px;
  background:var(--dong);transition:width var(--chuyen);
}
.the--dv:hover::after{width:100%}
.the--dv:hover{background:var(--trang)}
.the--dv .bt{width:26px;height:26px;stroke:var(--dong);stroke-width:1;margin-bottom:1.7rem}
.the--dv h3{font-size:1.4rem}
.the--dv .so-tt{color:var(--vien-dam);font-size:.82rem}

/* ---------- thẻ công trình: ảnh lớn, chữ đè nhẹ ---------- */
.the-da{border:0;background:transparent}
.the-da:hover{transform:none;box-shadow:none}
.the-da__anh{aspect-ratio:4/5;background:var(--nen-2)}
.the-da:hover .the-da__anh img{transform:scale(1.06)}
.the-da__chu{padding:1.35rem 0 0}
.the-da__chu strong{font-size:1.32rem;margin:.5rem 0 .35rem;transition:color var(--chuyen)}
.the-da:hover .the-da__chu strong{color:var(--dong)}
.the-da__meta{font-size:.8rem;letter-spacing:.04em}
.luoi-da{gap:2.2rem 1.8rem}
.luoi-da--nho .the-da__anh{aspect-ratio:4/3}

/* ---------- dải tối: nền gần đen, chữ sáng ---------- */
.dai-toi{background:var(--muc)}
.dai-toi p{color:rgba(255,255,255,.7)}
.dai-toi .luoi-da .the-da__chu strong{color:#fff}
.dai-toi .the-da:hover .the-da__chu strong{color:var(--dong-sang)}
.dai-toi .the-da__meta{color:rgba(255,255,255,.52)}
.dai-toi .lien-mui{color:var(--dong-sang)}

/* ---------- quy trình: số lớn kiểu tạp chí ---------- */
.quy-trinh li{border:0;border-top:1px solid var(--vien);background:transparent;padding:1.9rem 1.4rem 1.6rem 0}
.qt__so{
  width:auto;height:auto;background:none;color:var(--dong);border-radius:0;
  font-family:var(--serif);font-size:2.4rem;line-height:1;margin-bottom:.9rem;font-weight:400;
}
.quy-trinh h3{font-size:1.18rem;margin-bottom:.45rem}

/* ---------- dải số liệu: chữ số rất lớn ---------- */
.dai-so{background:var(--nen-2);padding:clamp(3.4rem,6vw,5rem) 0}
.so-lieu strong{font-size:clamp(2.6rem,1.8rem + 2.4vw,3.9rem);color:var(--muc);font-weight:400}
.so-lieu span{color:var(--muc-3);letter-spacing:.2em;font-size:.7rem}
.so-lieu div{border-left-color:var(--vien)}

/* ---------- mở bài: chữ serif lớn ---------- */
.bai__mo{font-size:clamp(1.24rem,1.1rem + .6vw,1.48rem);line-height:1.56;font-weight:400;color:var(--muc-2)}
.bai__than h2{font-size:clamp(1.7rem,1.35rem + 1.1vw,2.15rem);margin-top:3.2rem}
.bai__than h3{font-size:1.1rem;letter-spacing:.005em;font-weight:600}

/* ---------- ảnh bìa trang trong (dịch vụ / bài viết) ---------- */
.anh-bai{border:0;margin:2.2rem 0 2.6rem}
.anh-bai img{aspect-ratio:16/9;object-fit:cover}

/* ---------- thư viện ảnh công trình: không viền, sát nhau ---------- */
.thu-vien{gap:1.4rem}
.thu-vien figure{border:0}

/* ---------- gọi cuối & chân trang ---------- */
.goi-cuoi{background:var(--muc);padding:clamp(4rem,7vw,6.2rem) 0}
.goi-cuoi h2{max-width:20ch}
.chan{background:#0C0A08}

/* ---------- nút nổi: tinh hơn ---------- */
.lhn{font-size:.88rem;font-weight:400;letter-spacing:.02em;padding:.86rem 1.25rem;
  box-shadow:0 10px 30px rgba(12,10,8,.3)}
.lhn--goi{background:var(--muc)}

/* ---------- điện thoại ---------- */
@media (max-width:760px){
  .banner--bia{min-height:min(88vh,760px);padding-top:8.5rem}
  .banner--bia .banner__nut{margin-top:2rem}
  .banner--bia .banner__nut .nut{flex:1 1 100%}
  .the-da__anh{aspect-ratio:4/3}
  .luoi-da{gap:2rem 1.2rem}
  .the--dv{padding:2.4rem 0 2.6rem}
  .quy-trinh li{padding-right:0}
  body.co-bia .dieu-huong{background:rgba(20,17,14,.97);border-bottom-color:rgba(255,255,255,.12)}
  body.co-bia .dieu-huong a{border-bottom-color:rgba(255,255,255,.12)}
}
.chan__nhan{display:block;font-size:.68rem;letter-spacing:.18em;text-transform:uppercase;
  color:rgba(239,234,224,.4);margin-bottom:.15rem}
.chan__ds li{margin-bottom:.85rem;line-height:1.55}

/* Trên điện thoại: nút nổi thu về dạng tròn chỉ có biểu tượng,
   để không che mất nút bấm chính trong nội dung */
@media (max-width:760px){
  .lien-he-noi{gap:.7rem;right:14px;bottom:14px}
  .lhn{width:50px;height:50px;padding:0;border-radius:50%;justify-content:center}
  .lhn span{display:none}
  .lhn svg{width:22px;height:22px}
}

/* Chữ số: dùng phông sans cho rõ — số 1 của phông serif dễ nhìn nhầm thành chữ I */
.qt__so{
  font-family:var(--sans);font-weight:200;font-size:2.1rem;
  font-variant-numeric:lining-nums tabular-nums;letter-spacing:-.02em;
}
.so-lieu strong{font-family:var(--sans);font-weight:200;letter-spacing:-.025em;
  font-variant-numeric:lining-nums tabular-nums}
.the--dv .so-tt{font-family:var(--sans);font-weight:400;font-size:.72rem;letter-spacing:.12em}
.cot-diem span.so{font-family:var(--sans);font-weight:400;font-size:.76rem;letter-spacing:.12em}
.muc-luc li::before{font-family:var(--sans);font-weight:400;font-size:.72rem}