/* =========================================================
   PHỤ KIỆN HÀNG HIỆU — Design system "Phòng giám định"
   v1.0 · 2026-07-26
   Quy ước: mỗi component một tiền tố class riêng, chỉ dùng
   selector 1 class ở mức mặc định để tránh xung đột specificity.
   ========================================================= */

/* ---------- 1. TOKENS ---------- */
:root{
  /* màu */
  --ink:#1B1D21;
  --ink-2:#2A2D33;
  --ink-3:#3C4048;
  --ink-4:#6B707A;
  --calib:#C9C7C0;          /* xám 18% — nền chuẩn đọc đúng màu vật phẩm */
  --calib-dim:#B7B5AD;
  --calib-lift:#D5D3CC;
  --paper:#F4F3F0;
  --paper-2:#EAE8E4;
  --verd:#2C574E;
  --verd-lt:#3E7A6C;
  --verd-pale:#DDE7E4;
  --brass:#B08A48;
  --oxide:#A63D2F;
  --line:rgba(27,29,33,.18);
  --line-2:rgba(27,29,33,.10);
  --line-on-dark:rgba(255,255,255,.14);

  /* chữ */
  --ff-ui:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",sans-serif;
  --ff-doc:"Source Serif 4",Georgia,"Times New Roman",serif;
  --ff-data:"IBM Plex Mono",ui-monospace,"SFMono-Regular",monospace;

  /* nhịp */
  --gut:clamp(16px,4vw,40px);
  --maxw:1240px;
  --maxw-txt:68ch;
  --r:3px;
  --sec-y:clamp(44px,6.5vw,86px);

  /* bóng */
  --sh-1:0 2px 8px -4px rgba(15,17,20,.3);
  --sh-2:0 16px 34px -20px rgba(15,17,20,.55);
  --sh-3:0 24px 60px -30px rgba(15,17,20,.75);
}

/* ---------- 2. RESET / BASE ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;background:var(--calib);color:var(--ink);
  font-family:var(--ff-ui);font-size:16px;line-height:1.6;font-weight:400;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
img,svg,video{display:block;max-width:100%}
img{height:auto}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--verd);outline-offset:3px;border-radius:2px}
h1,h2,h3,h4,p,ul,ol,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
table{border-collapse:collapse;width:100%}

/* ---------- 3. TIỆN ÍCH ---------- */
.wrap{max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gut)}
.wrap-txt{max-width:var(--maxw-txt);margin-inline:auto;padding-inline:var(--gut)}
.sr{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;
  clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip{position:absolute;left:-9999px;top:0;z-index:99;background:var(--ink);color:var(--paper);
  padding:12px 18px;font-weight:600}
.skip:focus{left:8px;top:8px}
.mono{font-family:var(--ff-data);font-size:.72rem;letter-spacing:.08em;text-transform:uppercase}
.nowrap{white-space:nowrap}

/* ---------- 4. TYPO ---------- */
.h1{font-size:clamp(2rem,5.2vw,3.5rem);line-height:1.04;letter-spacing:-.035em;font-weight:800}
.h2{font-size:clamp(1.5rem,3.4vw,2.3rem);line-height:1.1;letter-spacing:-.028em;font-weight:800}
.h3{font-size:clamp(1.12rem,2vw,1.4rem);line-height:1.22;letter-spacing:-.02em;font-weight:600}
.h4{font-size:1rem;font-weight:600;letter-spacing:-.012em}
.lede{font-family:var(--ff-doc);font-size:clamp(1rem,1.6vw,1.13rem);line-height:1.62;color:var(--ink-2)}
.accent{color:var(--verd)}

.eyebrow{display:inline-flex;align-items:center;gap:9px;font-family:var(--ff-data);font-size:.66rem;
  letter-spacing:.14em;text-transform:uppercase;color:var(--verd);margin-bottom:14px;line-height:1.4}
.eyebrow::before{content:"";width:26px;height:1px;background:currentColor;flex:none}

/* văn bản dài */
.prose{font-family:var(--ff-doc);font-size:1.03rem;line-height:1.72;color:var(--ink-2)}
.prose > * + *{margin-top:1.05em}
.prose h2{font-family:var(--ff-ui);font-size:1.42rem;font-weight:800;letter-spacing:-.022em;
  line-height:1.2;color:var(--ink);margin-top:2.1em}
.prose h3{font-family:var(--ff-ui);font-size:1.06rem;font-weight:600;color:var(--ink);margin-top:1.7em}
.prose a{color:var(--verd);text-decoration:underline;text-underline-offset:3px}
.prose ul{padding-left:1.15em;list-style:disc}
.prose ol{padding-left:1.3em;list-style:decimal}
.prose li + li{margin-top:.42em}
.prose strong{font-weight:600;color:var(--ink)}

/* ---------- 5. SECTION ---------- */
.sec{padding-block:var(--sec-y)}
.sec-ink{background:var(--ink);color:var(--paper)}
.sec-paper{background:var(--paper)}
.sec-hd{max-width:62ch;margin-bottom:clamp(26px,4vw,44px)}
.sec-hd .h2{margin-bottom:12px}
.sec-ink .eyebrow{color:var(--verd-lt)}
.sec-ink .lede{color:#B6BAC1}
.rule{height:1px;background:var(--line);border:0;margin:0}

/* ---------- 6. THANH TIỆN ÍCH ---------- */
.util{background:var(--ink);color:#CFCEC8}
.util-row{display:flex;flex-wrap:wrap;gap:6px 22px;align-items:center;justify-content:center;
  padding-block:9px;font-family:var(--ff-data);font-size:.67rem;letter-spacing:.06em;text-transform:uppercase}
.util-row li{display:flex;align-items:center;gap:7px}
.util-row li::before{content:"";width:5px;height:5px;background:var(--verd-lt);border-radius:50%;flex:none}

/* ---------- 7. HEADER ---------- */
.hd{position:sticky;top:0;z-index:60;background:rgba(201,199,192,.94);
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.hd-row{display:flex;align-items:center;gap:clamp(12px,2.6vw,30px);padding-block:13px}
.brand{display:flex;align-items:center;gap:11px;flex:none}
.brand-mark{width:32px;height:32px;flex:none}
.brand-name{font-weight:800;font-size:.93rem;letter-spacing:-.02em;text-transform:uppercase;line-height:1}
.brand-sub{display:block;font-family:var(--ff-data);font-size:.57rem;letter-spacing:.16em;
  color:var(--ink-3);margin-top:4px;line-height:1}
.nav{display:flex;gap:clamp(10px,1.8vw,24px);margin-left:auto;font-size:.87rem;font-weight:600}
.nav a{padding-block:6px;border-bottom:1.5px solid transparent}
.nav a:hover,.nav a:focus-visible{border-bottom-color:var(--verd)}
.nav a[aria-current="page"]{border-bottom-color:var(--ink)}
.hd-act{display:flex;align-items:center;gap:8px;flex:none}
.burger{display:none;width:42px;height:42px;background:none;border:1px solid var(--line);
  border-radius:var(--r);cursor:pointer;padding:0;place-items:center}
.burger svg{width:20px;height:20px}

/* drawer mobile */
.drawer{position:fixed;inset:0;z-index:80;background:var(--ink);color:var(--paper);
  padding:20px var(--gut);display:none;overflow-y:auto}
.drawer[data-open="true"]{display:block}
.drawer-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:26px}
.drawer-close{background:none;border:1px solid var(--line-on-dark);border-radius:var(--r);
  width:42px;height:42px;display:grid;place-items:center;cursor:pointer;color:var(--paper)}
.drawer-close svg{width:18px;height:18px}
.drawer-nav li{border-bottom:1px solid var(--line-on-dark)}
.drawer-nav a{display:block;padding:15px 0;font-size:1.05rem;font-weight:600;letter-spacing:-.015em}
.drawer-foot{margin-top:26px;font-family:var(--ff-data);font-size:.66rem;letter-spacing:.07em;color:#8E939B;line-height:1.9}

/* ---------- 8. NÚT & FORM ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;cursor:pointer;
  border:1.5px solid transparent;border-radius:var(--r);padding:13px 22px;
  font-family:var(--ff-ui);font-weight:600;font-size:.93rem;line-height:1.2;
  transition:background .18s ease,color .18s ease,border-color .18s ease}
.btn-primary{background:var(--verd);color:var(--paper)}
.btn-primary:hover{background:var(--verd-lt)}
.btn-ink{background:var(--ink);color:var(--paper)}
.btn-ink:hover{background:var(--verd)}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--ink)}
.btn-ghost:hover{background:var(--ink);color:var(--paper)}
.btn-sm{padding:10px 15px;font-family:var(--ff-data);font-size:.67rem;letter-spacing:.08em;
  text-transform:uppercase;font-weight:400}
.btn-block{width:100%}

.field{display:grid;gap:7px}
.field label{font-family:var(--ff-data);font-size:.63rem;letter-spacing:.1em;
  text-transform:uppercase;color:var(--ink-3)}
.field input,.field select,.field textarea{
  width:100%;padding:13px 14px;background:var(--paper);color:var(--ink);
  border:1.5px solid var(--ink);border-radius:var(--r);font-size:.97rem}
.field input::placeholder,.field textarea::placeholder{color:#8C8F96}
.field-note{font-family:var(--ff-data);font-size:.62rem;letter-spacing:.05em;color:var(--ink-3);line-height:1.7}
.field-row{display:flex;gap:9px;flex-wrap:wrap}
.field-row input{flex:1 1 210px;min-width:0}

/* ---------- 9. BREADCRUMB ---------- */
.crumb{padding-block:16px;font-family:var(--ff-data);font-size:.63rem;letter-spacing:.08em;
  text-transform:uppercase;color:var(--ink-3)}
.crumb ol{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.crumb li{display:flex;gap:8px;align-items:center}
.crumb li + li::before{content:"›";color:var(--ink-4)}
.crumb a:hover{color:var(--verd)}
.crumb [aria-current]{color:var(--ink)}

/* ---------- 10. HỒ SƠ GIÁM ĐỊNH (component chữ ký) ---------- */
.dossier{display:grid;grid-template-columns:minmax(0,1.02fr) minmax(0,1fr);
  background:var(--ink);border-radius:var(--r);overflow:hidden;box-shadow:var(--sh-3)}
.tray{padding:clamp(20px,3vw,32px);
  background:radial-gradient(120% 90% at 50% 15%,#4A4E56 0%,#2A2D33 58%,#1F2126 100%)}
.tray-head{display:flex;justify-content:space-between;align-items:baseline;gap:12px;color:#9EA3AB;
  font-family:var(--ff-data);font-size:.63rem;letter-spacing:.1em;text-transform:uppercase;
  padding-bottom:12px;border-bottom:1px solid var(--line-on-dark)}
.tray-stage{aspect-ratio:4/3;display:grid;place-items:center;margin-block:clamp(12px,2vw,20px)}
.tray-stage svg{width:min(76%,320px);height:auto}
.thumbs{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
.thumb{background:rgba(255,255,255,.055);border:1px solid var(--line-on-dark);border-radius:2px;
  padding:8px 6px 7px;text-align:center;cursor:pointer;transition:border-color .18s,background .18s}
.thumb:hover{border-color:var(--verd-lt)}
.thumb[aria-current="true"]{border-color:var(--verd-lt);background:rgba(62,122,108,.16)}
.thumb svg{width:100%;height:38px;margin-inline:auto}
.thumb span{display:block;font-family:var(--ff-data);font-size:.55rem;letter-spacing:.06em;
  color:#8E939B;margin-top:6px;text-transform:uppercase}
.thumb[aria-current="true"] span{color:#CFE3DD}

.cert{background:var(--paper);padding:clamp(20px,3vw,32px);display:flex;flex-direction:column}
.cert-top{display:flex;justify-content:space-between;align-items:flex-start;gap:14px;
  padding-bottom:14px;border-bottom:1.5px solid var(--ink)}
.cert-label{font-family:var(--ff-data);font-size:.6rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--ink-3);margin-bottom:5px}
.cert-no{font-family:var(--ff-data);font-size:1.02rem;font-weight:500;letter-spacing:.02em}
.seal{width:52px;height:52px;flex:none}

.checks{counter-reset:c;margin-top:16px}
.checks li{display:grid;grid-template-columns:26px 1fr auto;gap:10px;align-items:center;
  padding-block:9px;border-bottom:1px dotted rgba(27,29,33,.24);font-size:.9rem}
.checks li::before{counter-increment:c;content:counter(c,decimal-leading-zero);
  font-family:var(--ff-data);font-size:.66rem;color:var(--ink-3)}
.tick{width:17px;height:17px;flex:none}
.tick path{stroke:var(--verd);stroke-width:2.4;fill:none;stroke-linecap:round;stroke-linejoin:round;
  stroke-dasharray:24;stroke-dashoffset:24;animation:tickdraw .42s ease forwards}
.checks li:nth-child(1) .tick path{animation-delay:.28s}
.checks li:nth-child(2) .tick path{animation-delay:.42s}
.checks li:nth-child(3) .tick path{animation-delay:.56s}
.checks li:nth-child(4) .tick path{animation-delay:.70s}
.checks li:nth-child(5) .tick path{animation-delay:.84s}
.checks li:nth-child(6) .tick path{animation-delay:.98s}
.checks li:nth-child(7) .tick path{animation-delay:1.12s}
.checks li:nth-child(8) .tick path{animation-delay:1.26s}
@keyframes tickdraw{to{stroke-dashoffset:0}}

.cert-foot{margin-top:auto;padding-top:18px}
.grade{display:flex;align-items:center;gap:14px;background:var(--ink);color:var(--paper);
  padding:13px 16px;border-radius:2px;margin-bottom:14px}
.grade-ltr{font-size:1.5rem;font-weight:800;line-height:1;color:var(--brass);flex:none}
.grade-txt{font-size:.79rem;line-height:1.45;color:#D3D2CC}
.signer{display:flex;justify-content:space-between;gap:12px;align-items:flex-end;
  font-family:var(--ff-data);font-size:.63rem;letter-spacing:.05em;color:var(--ink-3);
  padding-top:12px;border-top:1px solid var(--line)}
.signer b{display:block;font-family:var(--ff-ui);font-size:.86rem;font-weight:600;letter-spacing:0;
  color:var(--ink);text-transform:none;margin-top:3px}

/* ---------- 11. THẺ SẢN PHẨM ---------- */
.grid-prod{display:grid;grid-template-columns:repeat(auto-fill,minmax(232px,1fr));gap:clamp(12px,2vw,22px)}
.card{background:var(--paper);border-radius:var(--r);overflow:hidden;display:flex;flex-direction:column;
  transition:transform .2s ease,box-shadow .2s ease}
.card:hover{transform:translateY(-3px);box-shadow:var(--sh-2)}
.card-fig{position:relative;aspect-ratio:1;display:grid;place-items:center;
  background:linear-gradient(168deg,#D8D6CF,#C4C2BA)}
.card-fig svg{width:58%;height:auto}
.card-grade{position:absolute;top:10px;left:10px;background:var(--ink);color:var(--paper);
  font-family:var(--ff-data);font-size:.6rem;letter-spacing:.1em;padding:4px 8px;border-radius:2px}
.card-sold{position:absolute;inset:0;background:rgba(27,29,33,.62);display:grid;place-items:center;
  color:var(--paper);font-family:var(--ff-data);font-size:.66rem;letter-spacing:.14em;text-transform:uppercase}
.card-body{padding:15px 16px 18px;display:flex;flex-direction:column;gap:7px;flex:1}
.card-no{font-family:var(--ff-data);font-size:.6rem;letter-spacing:.1em;color:var(--ink-3)}
.card-title{font-size:.97rem;font-weight:600;letter-spacing:-.012em;line-height:1.35}
.card-meta{font-size:.79rem;color:var(--ink-3)}
.card-price{margin-top:auto;padding-top:10px;display:flex;align-items:baseline;gap:9px;
  border-top:1px solid var(--line-2)}
.card-price b{font-size:1.02rem;font-weight:800;letter-spacing:-.02em}
.card-price s{font-size:.76rem;color:var(--ink-3)}
.pass{display:inline-flex;align-items:center;gap:6px;font-family:var(--ff-data);font-size:.58rem;
  letter-spacing:.08em;color:var(--verd)}

/* ---------- 12. QUY TRÌNH ---------- */
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:1px;
  background:var(--line-on-dark)}
.step{background:var(--ink);padding:22px 20px 26px}
.step-n{font-family:var(--ff-data);font-size:.66rem;letter-spacing:.1em;color:var(--verd-lt);
  padding-bottom:12px;margin-bottom:14px;border-bottom:1px solid var(--line-on-dark)}
.step h3{font-size:1rem;font-weight:600;margin-bottom:8px;letter-spacing:-.01em}
.step p{font-size:.87rem;line-height:1.58;color:#A9AEB6}

/* ---------- 13. BẢNG ---------- */
.tbl{font-size:.9rem;background:var(--paper);border-radius:var(--r);overflow:hidden}
.tbl th,.tbl td{padding:13px 15px;text-align:left;border-bottom:1px solid var(--line-2);vertical-align:top}
.tbl th{font-family:var(--ff-data);font-size:.62rem;letter-spacing:.1em;text-transform:uppercase;
  color:var(--paper);background:var(--ink);font-weight:400;border-bottom:0}
.tbl tr:last-child td{border-bottom:0}
.tbl-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}
.tbl-grade{font-family:var(--ff-data);font-weight:500;color:var(--verd)}

/* ---------- 14. ACCORDION ---------- */
.acc{background:var(--paper);border-radius:var(--r);overflow:hidden}
.acc details{border-bottom:1px solid var(--line-2)}
.acc details:last-child{border-bottom:0}
.acc summary{padding:16px 18px;cursor:pointer;font-weight:600;font-size:.97rem;
  display:flex;justify-content:space-between;gap:14px;align-items:center;list-style:none}
.acc summary::-webkit-details-marker{display:none}
.acc summary::after{content:"+";font-family:var(--ff-data);font-size:1.1rem;color:var(--verd);flex:none}
.acc details[open] summary::after{content:"−"}
.acc-body{padding:0 18px 18px;font-family:var(--ff-doc);font-size:.97rem;line-height:1.68;color:var(--ink-2)}
.acc-body > * + *{margin-top:.8em}

/* ---------- 15. TRA CỨU ---------- */
.lookup{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.1fr);gap:clamp(22px,4vw,54px);align-items:start}
.result{min-height:186px;background:var(--paper);border:1.5px solid var(--ink);border-radius:var(--r);padding:20px}
.result[data-state="empty"]{border-style:dashed;border-color:rgba(27,29,33,.35);background:transparent}
.result-idle{font-family:var(--ff-doc);color:var(--ink-2);font-size:.97rem}
.rrow{display:flex;justify-content:space-between;gap:12px;padding-block:8px;font-size:.88rem;
  border-bottom:1px dotted rgba(27,29,33,.22)}
.rrow:last-child{border-bottom:0}
.rrow dt{font-family:var(--ff-data);font-size:.62rem;letter-spacing:.09em;color:var(--ink-3);padding-top:3px}
.rrow dd{margin:0;text-align:right;font-weight:600}
.rhead{display:flex;align-items:center;gap:11px;margin-bottom:12px;flex-wrap:wrap}
.rhead b{font-size:1.02rem;letter-spacing:-.01em;font-family:var(--ff-data);font-weight:500}
.badge{font-family:var(--ff-data);font-size:.6rem;letter-spacing:.1em;padding:5px 9px;border-radius:2px;
  text-transform:uppercase}
.badge-ok{background:var(--verd);color:var(--paper)}
.badge-no{background:var(--oxide);color:var(--paper)}
.badge-sold{background:var(--ink-3);color:var(--paper)}

/* ---------- 16. CAM KẾT ---------- */
.pledge{display:grid;grid-template-columns:repeat(auto-fit,minmax(228px,1fr));gap:clamp(14px,2.4vw,26px)}
.pledge > li{border-top:2px solid var(--ink);padding-top:15px}
.pledge h3{font-size:.98rem;font-weight:600;margin-bottom:7px;letter-spacing:-.012em}
.pledge p{font-size:.87rem;line-height:1.6;color:var(--ink-2)}
.pledge cite{display:block;font-family:var(--ff-data);font-size:.6rem;letter-spacing:.07em;
  color:var(--verd);font-style:normal;margin-top:9px;line-height:1.6}

/* ---------- 17. TRANG SẢN PHẨM ---------- */
.pdp{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:clamp(24px,4vw,56px);align-items:start}
.gal-main{aspect-ratio:1;background:radial-gradient(120% 90% at 50% 20%,#D9D7D0,#BEBCB4);
  border-radius:var(--r);display:grid;place-items:center;overflow:hidden}
.gal-main svg{width:64%;height:auto}
.gal-strip{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;margin-top:8px}
.gal-btn{aspect-ratio:1;background:var(--calib-lift);border:1.5px solid transparent;border-radius:2px;
  cursor:pointer;display:grid;place-items:center;padding:8px}
.gal-btn svg{width:74%;height:auto}
.gal-btn[aria-current="true"]{border-color:var(--ink)}
.gal-cap{font-family:var(--ff-data);font-size:.62rem;letter-spacing:.08em;text-transform:uppercase;
  color:var(--ink-3);margin-top:10px}

.buy-head{padding-bottom:16px;border-bottom:1.5px solid var(--ink)}
.buy-price{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap;margin-top:14px}
.buy-price b{font-size:clamp(1.5rem,3vw,2rem);font-weight:800;letter-spacing:-.03em}
.buy-price s{color:var(--ink-3);font-size:.95rem}
.buy-save{font-family:var(--ff-data);font-size:.62rem;letter-spacing:.08em;background:var(--verd-pale);
  color:var(--verd);padding:4px 8px;border-radius:2px}
.spec{margin-block:18px}
.spec div{display:flex;justify-content:space-between;gap:14px;padding-block:9px;
  border-bottom:1px dotted rgba(27,29,33,.22);font-size:.89rem}
.spec dt{font-family:var(--ff-data);font-size:.62rem;letter-spacing:.09em;color:var(--ink-3);padding-top:3px}
.spec dd{margin:0;text-align:right;font-weight:600}
.buy-act{display:grid;gap:9px;margin-top:20px}
.tldr{background:var(--paper);border-left:3px solid var(--verd);padding:16px 18px;border-radius:0 var(--r) var(--r) 0;
  font-family:var(--ff-doc);font-size:.97rem;line-height:1.66;color:var(--ink-2);margin-bottom:20px}

/* ---------- 18. FOOTER ---------- */
.ft{background:var(--ink);color:#A9AEB6;padding-block:clamp(38px,5vw,62px) 26px;font-size:.85rem}
.ft-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:26px 30px;margin-bottom:30px}
.ft-h{font-family:var(--ff-data);font-size:.62rem;letter-spacing:.13em;text-transform:uppercase;
  color:var(--paper);margin-bottom:12px;font-weight:400}
.ft ul{display:grid;gap:7px}
.ft a:hover{color:var(--paper)}
.ft-legal{border-top:1px solid var(--line-on-dark);padding-top:20px;font-size:.76rem;
  line-height:1.68;color:#868B93}
.ft-legal p + p{margin-top:8px}
.ft-legal strong{color:#C3C7CD;font-weight:600}

/* ---------- 19. RESPONSIVE ---------- */
@media (max-width:980px){
  .dossier{grid-template-columns:1fr}
  .pdp{grid-template-columns:1fr}
  .lookup{grid-template-columns:1fr}
}
@media (max-width:860px){
  .nav{display:none}
  .burger{display:grid}
}
@media (max-width:520px){
  .brand-sub{display:none}
  .thumbs{grid-template-columns:repeat(2,1fr)}
  .gal-strip{grid-template-columns:repeat(3,1fr)}
  .util-row{font-size:.62rem;gap:5px 14px}
}

/* ---------- 20. GIẢM CHUYỂN ĐỘNG / IN ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;
    transition-duration:.001ms!important}
  .tick path{stroke-dashoffset:0}
}
@media print{
  .hd,.util,.ft,.drawer,.buy-act{display:none}
  body{background:#fff;color:#000}
  .dossier{box-shadow:none;border:1px solid #000}
}

/* ---------- 21. BỘ LỌC DANH MỤC ---------- */
.filter{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:clamp(18px,3vw,28px)}
.filter-lbl{font-family:var(--ff-data);font-size:.62rem;letter-spacing:.1em;text-transform:uppercase;
  color:var(--ink-3);margin-right:4px}
.chip{background:transparent;border:1.5px solid var(--line);border-radius:var(--r);cursor:pointer;
  padding:8px 14px;font-family:var(--ff-data);font-size:.66rem;letter-spacing:.08em;text-transform:uppercase;
  color:var(--ink-2);transition:background .16s,border-color .16s,color .16s}
.chip:hover{border-color:var(--ink)}
.chip[aria-pressed="true"]{background:var(--ink);border-color:var(--ink);color:var(--paper)}
.filter-count{font-family:var(--ff-data);font-size:.66rem;letter-spacing:.06em;color:var(--ink-3);margin-left:auto}
.card[hidden]{display:none}

/* ---------- 22. TRẠNG THÁI RỖNG ---------- */
.empty{border:1.5px dashed rgba(27,29,33,.35);border-radius:var(--r);padding:clamp(24px,4vw,40px);
  text-align:center;max-width:62ch;margin-inline:auto}
.empty h3{font-size:1.05rem;font-weight:600;margin-bottom:8px}
.empty p{font-size:.92rem;line-height:1.6;color:var(--ink-2);margin-bottom:16px}

/* ---------- 23. BÀI VIẾT ---------- */
.art-hd{max-width:70ch;margin-bottom:clamp(24px,4vw,38px)}
.art-meta{display:flex;flex-wrap:wrap;gap:6px 18px;font-family:var(--ff-data);font-size:.63rem;
  letter-spacing:.07em;color:var(--ink-3);margin-top:14px;padding-top:14px;border-top:1px solid var(--line)}
.art-body{max-width:70ch}
.art-body .tldr{margin-bottom:26px}
.callout{background:var(--paper);border-left:3px solid var(--brass);padding:16px 18px;
  border-radius:0 var(--r) var(--r) 0;font-size:.93rem;line-height:1.64;margin-block:1.3em}
.callout strong{font-weight:600}
.art-list{display:grid;gap:1px;background:var(--line);border-radius:var(--r);overflow:hidden}
.art-list li{background:var(--paper)}
.art-list a{display:block;padding:18px 20px;transition:background .16s}
.art-list a:hover{background:var(--paper-2)}
.art-list h3{font-size:1.02rem;font-weight:600;letter-spacing:-.014em;margin-bottom:6px}
.art-list p{font-size:.87rem;line-height:1.55;color:var(--ink-3)}

/* ---------- 24. SHOWROOM / LIÊN HỆ ---------- */
.two-col{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:clamp(24px,4vw,52px);align-items:start}
.info-list li{display:flex;justify-content:space-between;gap:16px;padding-block:12px;
  border-bottom:1px dotted rgba(27,29,33,.22);font-size:.92rem}
.info-list li:last-child{border-bottom:0}
.info-list b{font-family:var(--ff-data);font-size:.62rem;letter-spacing:.09em;color:var(--ink-3);
  font-weight:400;padding-top:3px;flex:none}
.info-list span{text-align:right;font-weight:600}
.form-grid{display:grid;gap:14px}
.form-note{background:var(--paper);border-radius:var(--r);padding:14px 16px;font-size:.85rem;
  line-height:1.6;color:var(--ink-2)}
@media (max-width:900px){.two-col{grid-template-columns:1fr}}

/* ---------- 25. PHẢN HỒI BIỂU MẪU ---------- */
.form-msg{font-size:.88rem;line-height:1.55;min-height:1.3em}
.form-msg[data-state="ok"]{color:var(--verd);font-weight:600}
.form-msg[data-state="err"]{color:var(--oxide);font-weight:600}
.consent{display:flex;gap:9px;align-items:flex-start;font-size:.83rem;line-height:1.55;color:var(--ink-2)}
.consent input{margin-top:3px;flex:none;width:16px;height:16px;accent-color:var(--verd)}
.consent a{color:var(--verd);text-decoration:underline;text-underline-offset:2px}