:root{
    --bg-dark:#0B1220;
    --bg-darker:#060A12;
    --steel:#8FA3B8;
    --steel-light:#C8D3DE;
    --surface:#F5F7F9;
    --surface-2:#FFFFFF;
    --ink:#101820;
    --ink-soft:#3C4A57;
    --blue:#2E6FE0;
    --blue-deep:#1B4FB8;
    --ember:#E8632A;
    --flame:#D6303B;
    --gold:#E8B23A;
    --line-dark:rgba(255,255,255,0.10);
    --line-light:rgba(16,24,32,0.10);
    --radius:10px;
    --maxw:1180px;
  }
  *{box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  @media (prefers-reduced-motion: reduce){
    html{scroll-behavior:auto;}
    *{animation-duration:0.001ms !important; transition-duration:0.001ms !important;}
  }
  body{
    margin:0;
    font-family:'Be Vietnam Pro',system-ui,sans-serif;
    background:var(--surface);
    color:var(--ink);
    -webkit-font-smoothing:antialiased;
  }
  h1,h2,h3,.display{
    font-family:'Oswald',system-ui,sans-serif;
    text-transform:uppercase;
    letter-spacing:0.01em;
    margin:0;
    line-height:1.08;
  }
  .mono{ font-family:'IBM Plex Mono',monospace; }
  a{color:inherit;text-decoration:none;}
  img{max-width:100%;display:block;}
  .wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px;}
  button{font-family:inherit;cursor:pointer;}
  .visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);}
  :focus-visible{outline:2px solid var(--blue);outline-offset:2px;}

  /* ---------- NAV ---------- */
  header.site{
    position:sticky;top:0;z-index:50;
    background:var(--bg-dark);
    border-bottom:1px solid var(--line-dark);
  }
  .nav{display:flex;align-items:center;justify-content:space-between;padding:12px 24px;max-width:var(--maxw);margin:0 auto;}
  .nav-brand{display:flex;align-items:center;gap:12px;}
  .nav-brand img{height:46px;width:auto;background:#fff;border-radius:6px;padding:3px;}
  .nav-brand .name{color:#fff;font-family:'Oswald';text-transform:uppercase;font-size:15px;letter-spacing:0.03em;line-height:1.15;}
  .nav-brand .name small{display:block;font-family:'Be Vietnam Pro';text-transform:none;color:var(--steel);font-size:11px;letter-spacing:0.02em;font-weight:400;}
  nav.links{display:flex;gap:28px;align-items:center;}
  nav.links a{color:var(--steel-light);font-size:14px;font-weight:500;padding:6px 2px;border-bottom:2px solid transparent;transition:border-color .15s,color .15s;}
  nav.links a:hover{color:#fff;border-color:var(--ember);}
  .btn{
    display:inline-flex;align-items:center;gap:8px;
    padding:11px 20px;border-radius:6px;border:1px solid transparent;
    font-weight:600;font-size:14px;letter-spacing:0.01em;transition:transform .12s,background .15s,border-color .15s;
  }
  .btn:hover{transform:translateY(-1px);}
  .btn-primary{background:var(--ember);color:#fff;}
  .btn-primary:hover{background:#d1551f;}
  .btn-ghost{background:transparent;color:#fff;border-color:var(--line-dark);}
  .btn-ghost:hover{border-color:var(--steel-light);}
  .btn-dark{background:var(--bg-dark);color:#fff;}
  .btn-outline{background:transparent;border-color:var(--blue);color:var(--blue-deep);}
  .btn-outline:hover{background:var(--blue);color:#fff;}
  .menu-toggle{display:none;background:none;border:1px solid var(--line-dark);color:#fff;padding:8px 10px;border-radius:6px;}

  /* ---------- HERO ---------- */
  .hero{background:var(--bg-dark);color:#fff;position:relative;overflow:hidden;}
  .hero::after{
    content:"";position:absolute;inset:0;
    background:radial-gradient(ellipse at 80% 20%, rgba(46,111,224,0.25), transparent 55%),
               radial-gradient(ellipse at 20% 90%, rgba(232,99,42,0.18), transparent 50%);
    pointer-events:none;
    animation:kilnGlow 7s ease-in-out infinite;
  }
  @keyframes kilnGlow{0%,100%{opacity:1;}50%{opacity:0.55;}}

  /* ---------- entrance / scroll-reveal animations ---------- */
  @keyframes heroIn{from{opacity:0;transform:translateY(18px);}to{opacity:1;transform:translateY(0);}}
  .hero-anim{opacity:0;animation:heroIn .7s cubic-bezier(.16,.8,.24,1) forwards;}
  @keyframes chipIn{from{opacity:0;transform:translateX(10px);}to{opacity:1;transform:translateX(0);}}
  .swatch-chip{animation:chipIn .5s cubic-bezier(.16,.8,.24,1) both;}

  .reveal{opacity:0;transform:translateY(26px);transition:opacity .65s cubic-bezier(.16,.8,.24,1),transform .65s cubic-bezier(.16,.8,.24,1);}
  .reveal.in-view{opacity:1;transform:translateY(0);}
  .cat-grid .reveal:nth-child(2),.why-grid .reveal:nth-child(2),
  .product-grid .reveal:nth-child(2),.app-grid .reveal:nth-child(2){transition-delay:.06s;}
  .why-grid .reveal:nth-child(3),.product-grid .reveal:nth-child(3),.app-grid .reveal:nth-child(3){transition-delay:.12s;}
  .why-grid .reveal:nth-child(4),.product-grid .reveal:nth-child(4),.app-grid .reveal:nth-child(4){transition-delay:.18s;}
  .product-grid .reveal:nth-child(5),.app-grid .reveal:nth-child(5){transition-delay:.24s;}
  .product-grid .reveal:nth-child(6),.app-grid .reveal:nth-child(6){transition-delay:.3s;}
  .product-grid .reveal:nth-child(7),.app-grid .reveal:nth-child(7){transition-delay:.36s;}
  .product-grid .reveal:nth-child(8),.app-grid .reveal:nth-child(8){transition-delay:.42s;}
  .hero-inner{max-width:var(--maxw);margin:0 auto;padding:76px 24px 64px;display:grid;grid-template-columns:1.15fr 0.85fr;gap:56px;align-items:center;position:relative;z-index:1;}
  .eyebrow{font-family:'IBM Plex Mono';font-size:12px;letter-spacing:0.14em;color:var(--gold);text-transform:uppercase;margin-bottom:16px;display:flex;align-items:center;gap:10px;}
  .eyebrow::before{content:"";width:22px;height:1px;background:var(--gold);display:inline-block;}
  .hero h1{font-size:44px;color:#fff;}
  .hero h1 em{font-style:normal;color:var(--ember);}
  .hero p.lead{color:var(--steel-light);font-size:16px;line-height:1.65;max-width:46ch;margin:20px 0 30px;}
  .hero-ctas{display:flex;gap:14px;flex-wrap:wrap;}

  /* signature swatch card */
  .swatch-card{
    background:rgba(255,255,255,0.03);
    border:1px solid var(--line-dark);
    border-radius:14px;padding:22px;
    transform:rotate(1.2deg);
    box-shadow:0 30px 60px -20px rgba(0,0,0,0.6);
  }
  .swatch-card .cap{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:14px;}
  .swatch-card .cap span:first-child{font-family:'Oswald';font-size:13px;letter-spacing:0.06em;color:var(--steel-light);text-transform:uppercase;}
  .swatch-card .cap span:last-child{font-family:'IBM Plex Mono';font-size:11px;color:var(--steel);}
  .swatch-row{display:flex;flex-direction:column;gap:8px;}
  .swatch-chip{
    display:flex;align-items:center;justify-content:space-between;
    border-radius:8px;padding:12px 14px;
  }
  .swatch-chip .lbl{font-family:'IBM Plex Mono';font-size:12px;color:rgba(0,0,0,0.55);}
  .swatch-chip .t{font-family:'IBM Plex Mono';font-size:12px;font-weight:500;color:rgba(0,0,0,0.65);}

  /* ---------- capability strip ---------- */
  .cap-strip{background:var(--bg-darker);border-top:1px solid var(--line-dark);border-bottom:1px solid var(--line-dark);}
  .cap-strip .wrap{display:flex;flex-wrap:wrap;gap:0;padding:0;}
  .cap-item{flex:1 1 220px;padding:20px 24px;border-right:1px solid var(--line-dark);color:var(--steel-light);font-size:13.5px;display:flex;gap:10px;align-items:flex-start;}
  .cap-item:last-child{border-right:none;}
  .cap-item .dot{width:8px;height:8px;border-radius:50%;background:var(--ember);margin-top:5px;flex-shrink:0;}

  /* ---------- section shell ---------- */
  section{padding:80px 0;}
  .section-head{max-width:640px;margin-bottom:44px;}
  .section-head .eyebrow{color:var(--blue-deep);}
  .section-head .eyebrow::before{background:var(--blue-deep);}
  .section-head h2{font-size:32px;color:var(--ink);}
  .section-head p{color:var(--ink-soft);font-size:15.5px;line-height:1.6;margin-top:14px;}
  .on-dark .section-head h2{color:#fff;}
  .on-dark .section-head p{color:var(--steel-light);}
  .on-dark .section-head .eyebrow{color:var(--gold);}
  .on-dark .section-head .eyebrow::before{background:var(--gold);}

  /* ---------- category split ---------- */
  .cat-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;}
  .cat-card{
    border-radius:14px;padding:32px;position:relative;overflow:hidden;
    border:1px solid var(--line-light);background:var(--surface-2);
    transition:transform .18s, box-shadow .18s;
  }
  .cat-card:hover{transform:translateY(-4px);box-shadow:0 24px 40px -24px rgba(16,24,32,0.25);}
  .cat-card .tag{font-family:'IBM Plex Mono';font-size:11px;letter-spacing:0.08em;color:#fff;background:var(--blue-deep);display:inline-block;padding:4px 10px;border-radius:20px;text-transform:uppercase;margin-bottom:16px;}
  .cat-card.jewelry .tag{background:var(--ember);}
  .cat-card.additive .tag{background:#B08B2E;}
  .cat-card.equipment .tag{background:var(--ink-soft);}
  .cat-card h3{font-size:22px;margin-bottom:10px;}
  .cat-card p{color:var(--ink-soft);font-size:14.5px;line-height:1.6;margin-bottom:18px;}
  .mini-swatches{display:flex;gap:6px;margin-bottom:20px;}
  .mini-swatches i{width:22px;height:22px;border-radius:5px;display:block;}

  /* ---------- product filter/grid ---------- */
  .filter-bar{display:flex;gap:10px;margin-bottom:28px;flex-wrap:wrap;}
  .filter-btn{
    padding:9px 18px;border-radius:20px;border:1px solid var(--line-light);
    background:var(--surface-2);font-size:13.5px;font-weight:600;color:var(--ink-soft);
  }
  .filter-btn.active{background:var(--bg-dark);color:#fff;border-color:var(--bg-dark);}
  .product-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(258px,1fr));gap:22px;}
  .p-card{
    background:var(--surface-2);border:1px solid var(--line-light);border-radius:12px;overflow:hidden;
    display:flex;flex-direction:column;transition:transform .15s,box-shadow .15s;
  }
  .p-card:hover{transform:translateY(-3px);box-shadow:0 20px 34px -22px rgba(16,24,32,0.3);}
  .p-thumb{height:150px;position:relative;display:flex;align-items:flex-end;}
  .p-thumb img{width:100%;height:100%;object-fit:contain;}
  .p-thumb .cat-pill{
    position:absolute;top:10px;left:10px;background:rgba(6,10,18,0.7);color:#fff;
    font-family:'IBM Plex Mono';font-size:10px;letter-spacing:0.04em;padding:3px 9px;border-radius:20px;text-transform:uppercase;
  }
  .p-body{padding:16px 16px 18px;display:flex;flex-direction:column;gap:8px;flex:1;}
  .p-body h4{font-family:'Oswald';font-size:16px;text-transform:none;letter-spacing:0;color:var(--ink);transition:color .15s;}
  .p-body h4:hover{color:var(--blue-deep);}
  .p-body p{font-size:13px;color:var(--ink-soft);line-height:1.55;margin:0;flex:1;}
  .p-meta{display:flex;gap:10px;font-family:'IBM Plex Mono';font-size:11px;color:var(--blue-deep);}
  .p-actions{margin-top:6px;}
  .p-actions button{width:100%;background:var(--surface);border:1px solid var(--line-light);border-radius:6px;padding:9px;font-size:13px;font-weight:600;color:var(--ink);}
  .p-actions button:hover{background:var(--bg-dark);color:#fff;border-color:var(--bg-dark);}
  .empty-state{padding:50px 20px;text-align:center;color:var(--ink-soft);border:1px dashed var(--line-light);border-radius:12px;}

  /* ---------- applications ---------- */
  .app-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px;}
  .app-card{background:var(--surface-2);border:1px solid var(--line-light);border-radius:10px;padding:20px;}
  .app-card .n{font-family:'IBM Plex Mono';font-size:11px;color:var(--steel);}
  .app-card h4{font-family:'Oswald';font-size:15px;text-transform:none;margin-top:6px;color:var(--ink);}

  /* ---------- why us ---------- */
  .why-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
  .why-card{border-top:3px solid var(--ember);padding-top:16px;}
  .why-card h4{font-family:'Oswald';font-size:15px;text-transform:none;color:#fff;margin-bottom:8px;}
  .why-card p{color:var(--steel-light);font-size:13.5px;line-height:1.6;margin:0;}

  /* ---------- divider swatch strip ---------- */
  .divider-strip{display:flex;height:10px;}
  .divider-strip i{flex:1;}

  /* ---------- contact ---------- */
  .contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;}
  .field{margin-bottom:16px;}
  .field label{display:block;font-size:12.5px;font-weight:600;color:var(--ink-soft);margin-bottom:6px;text-transform:uppercase;letter-spacing:0.03em;}
  .field input,.field select,.field textarea{
    width:100%;padding:11px 13px;border-radius:7px;border:1px solid var(--line-light);
    font-family:inherit;font-size:14px;background:#fff;color:var(--ink);
  }
  .field input:focus,.field select:focus,.field textarea:focus{border-color:var(--blue);}
  .two-col{display:grid;grid-template-columns:1fr 1fr;gap:14px;}
  .info-card{background:var(--bg-dark);color:#fff;border-radius:14px;padding:30px;}
  .info-card h3{font-size:20px;margin-bottom:16px;}
  .info-row{display:flex;gap:12px;padding:12px 0;border-top:1px solid var(--line-dark);font-size:14px;color:var(--steel-light);}
  .info-row:first-of-type{border-top:none;}
  .info-row .k{font-family:'IBM Plex Mono';font-size:11px;color:var(--gold);text-transform:uppercase;min-width:90px;}

  /* ---------- footer ---------- */
  footer{background:var(--bg-darker);color:var(--steel);padding:44px 0 24px;}
  .foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:32px;margin-bottom:32px;}
  .foot-brand{display:flex;gap:12px;align-items:center;margin-bottom:12px;}
  .foot-brand img{height:38px;background:#fff;border-radius:5px;padding:2px;}
  footer h5{font-family:'Oswald';font-size:12px;letter-spacing:0.08em;text-transform:uppercase;color:var(--steel-light);margin-bottom:14px;}
  footer a{display:block;color:var(--steel);font-size:13.5px;margin-bottom:9px;}
  footer a:hover{color:#fff;}
  .foot-bottom{border-top:1px solid var(--line-dark);padding-top:18px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:12.5px;color:var(--steel);}

  /* ---------- modal ---------- */
  .modal-backdrop{position:fixed;inset:0;background:rgba(6,10,18,0.72);display:none;align-items:center;justify-content:center;z-index:200;padding:20px;}
  .modal-backdrop.open{display:flex;}
  .modal{background:#fff;border-radius:14px;max-width:640px;width:100%;max-height:88vh;overflow:auto;}
  .modal-hero{height:320px;background:var(--bg-dark);position:relative;}
  .modal-hero img{width:100%;height:100%;object-fit:contain;}
  .modal-close{position:absolute;top:14px;right:14px;background:rgba(0,0,0,0.5);color:#fff;border:none;width:34px;height:34px;border-radius:50%;font-size:16px;}
  .modal-body{padding:26px 28px 30px;}
  .modal-body .cat-pill{font-family:'IBM Plex Mono';font-size:10.5px;background:var(--surface);padding:4px 10px;border-radius:20px;color:var(--blue-deep);text-transform:uppercase;}
  .modal-body h3{font-size:24px;margin:14px 0 12px;}
  .modal-body p.desc{color:var(--ink-soft);font-size:14.5px;line-height:1.7;margin-bottom:18px;}
  .spec-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:22px;}
  .spec-box{background:var(--surface);border-radius:8px;padding:12px 14px;}
  .spec-box .k{font-family:'IBM Plex Mono';font-size:10.5px;color:var(--steel);text-transform:uppercase;letter-spacing:0.04em;}
  .spec-box .v{font-size:14px;font-weight:600;color:var(--ink);margin-top:4px;}

  /* ---------- toast ---------- */
  .toast{position:fixed;bottom:24px;left:24px;background:var(--bg-dark);color:#fff;padding:14px 20px;border-radius:8px;font-size:14px;box-shadow:0 20px 40px rgba(0,0,0,0.3);z-index:300;display:none;border-left:4px solid var(--ember);max-width:320px;}
  .toast.show{display:block;}

  /* ---------- floating contact (call / zalo) ---------- */
  .float-contact{
    position:fixed;right:20px;bottom:20px;
    padding-bottom:env(safe-area-inset-bottom, 0);
    z-index:150;display:flex;flex-direction:column;gap:14px;align-items:flex-end;
  }
  .fab-btn{
    position:relative;width:56px;height:56px;border-radius:50%;
    display:flex;align-items:center;justify-content:center;color:#fff;
    box-shadow:0 12px 26px rgba(6,10,18,0.3);
    transition:transform .15s;
  }
  .fab-btn:hover{transform:translateY(-2px) scale(1.05);}
  .fab-call{background:var(--ember);}
  .fab-zalo{background:#0068FF;}
  .fab-chat{background:var(--bg-dark);border:none;}
  .fab-ping{
    position:absolute;inset:-6px;border-radius:50%;border:2px solid var(--ember);
    opacity:0;animation:fabping 2.4s ease-out infinite;
  }
  @keyframes fabping{0%{transform:scale(0.85);opacity:0.65;}100%{transform:scale(1.4);opacity:0;}}
  .fab-tip{
    position:absolute;right:68px;top:50%;transform:translateY(-50%) translateX(6px);
    background:var(--bg-dark);color:#fff;font-size:12.5px;font-weight:600;
    padding:7px 12px;border-radius:6px;white-space:nowrap;
    opacity:0;pointer-events:none;transition:opacity .15s,transform .15s;
  }
  .fab-btn:hover .fab-tip,.fab-btn:focus-visible .fab-tip{opacity:1;transform:translateY(-50%) translateX(0);}
  @media (max-width:680px){
    .float-contact{right:14px;bottom:14px;gap:12px;}
    .fab-btn{width:50px;height:50px;}
    .fab-tip{display:none;}
    .chat-panel{right:12px;left:12px;width:auto;bottom:78px;}
  }

  /* ---------- chat panel ---------- */
  .chat-panel{
    position:fixed;right:20px;bottom:96px;width:320px;max-height:440px;
    background:#fff;border-radius:16px;box-shadow:0 24px 60px rgba(6,10,18,0.35);
    display:none;flex-direction:column;overflow:hidden;z-index:160;border:1px solid var(--line-light);
  }
  .chat-panel.open{display:flex;}
  .chat-head{background:var(--bg-dark);color:#fff;padding:14px 16px;display:flex;justify-content:space-between;align-items:center;font-family:'Oswald';font-size:14px;letter-spacing:0.02em;text-transform:uppercase;}
  .chat-head button{background:none;border:none;color:#fff;font-size:16px;opacity:0.8;}
  .chat-head button:hover{opacity:1;}
  .chat-body{padding:16px;overflow-y:auto;flex:1;display:flex;flex-direction:column;gap:10px;background:var(--surface);}
  .chat-msg{max-width:85%;padding:10px 13px;border-radius:12px;font-size:13.5px;line-height:1.5;}
  .chat-msg.bot{background:#fff;border:1px solid var(--line-light);align-self:flex-start;border-bottom-left-radius:3px;}
  .chat-msg.user{background:var(--blue);color:#fff;align-self:flex-end;border-bottom-right-radius:3px;}
  .chat-input-area{padding:12px;border-top:1px solid var(--line-light);background:#fff;display:flex;gap:8px;}
  .chat-input-area input,.chat-input-area textarea{flex:1;border:1px solid var(--line-light);border-radius:8px;padding:9px 11px;font-family:inherit;font-size:13.5px;resize:none;}
  .chat-input-area button{background:var(--ember);color:#fff;border:none;border-radius:8px;padding:0 16px;font-weight:600;font-size:13px;}
  .chat-input-area button:hover{background:#d1551f;}

  /* ---------- admin ---------- */
  #admin-view{display:none;min-height:100vh;background:var(--surface);}
  .admin-shell{display:grid;grid-template-columns:220px 1fr;min-height:100vh;}
  .admin-side{background:var(--bg-dark);color:#fff;padding:24px 18px;}
  .admin-side .a-brand{font-family:'Oswald';font-size:14px;letter-spacing:0.03em;margin-bottom:26px;color:#fff;}
  .admin-side a.tab{display:block;padding:11px 12px;border-radius:7px;color:var(--steel-light);font-size:13.5px;font-weight:600;margin-bottom:6px;}
  .admin-side a.tab.active,.admin-side a.tab:hover{background:rgba(255,255,255,0.08);color:#fff;}
  .admin-main{padding:32px 36px;}
  .admin-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px;}
  .admin-head h2{font-size:22px;}
  .admin-login{max-width:380px;margin:110px auto;background:#fff;padding:34px;border-radius:14px;border:1px solid var(--line-light);}
  .admin-login h2{font-size:20px;margin-bottom:6px;}
  .admin-login p{color:var(--ink-soft);font-size:13.5px;margin-bottom:20px;}
  .admin-table{width:100%;border-collapse:collapse;background:#fff;border-radius:10px;overflow:hidden;border:1px solid var(--line-light);}
  .admin-table th{text-align:left;font-family:'IBM Plex Mono';font-size:11px;text-transform:uppercase;color:var(--steel);background:var(--surface);padding:12px 14px;letter-spacing:0.03em;}
  .admin-table td{padding:12px 14px;border-top:1px solid var(--line-light);font-size:13.5px;vertical-align:middle;}
  .admin-table img{width:42px;height:42px;object-fit:cover;border-radius:6px;}
  .row-actions{display:flex;gap:8px;}
  .row-actions button{padding:6px 10px;font-size:12px;border-radius:5px;border:1px solid var(--line-light);background:#fff;}
  .row-actions button.danger{color:var(--flame);border-color:var(--flame);}
  .admin-form{background:#fff;border:1px solid var(--line-light);border-radius:12px;padding:24px;max-width:640px;}
  .admin-form .grid2{display:grid;grid-template-columns:1fr 1fr;gap:14px;}
  .lead-card{background:#fff;border:1px solid var(--line-light);border-radius:10px;padding:16px 18px;margin-bottom:12px;}
  .lead-card .top{display:flex;justify-content:space-between;font-size:13px;color:var(--ink-soft);margin-bottom:6px;}
  .lead-card h4{font-size:15px;margin-bottom:4px;}
  .file-drop{border:1.5px dashed var(--line-light);border-radius:8px;padding:16px;text-align:center;font-size:13px;color:var(--ink-soft);}
  .thumb-preview{width:80px;height:80px;object-fit:cover;border-radius:8px;margin-top:10px;}

  /* ---------- responsive ---------- */
  @media (max-width:960px){
    .hero-inner{grid-template-columns:1fr;padding-top:44px;}
    .cat-grid{grid-template-columns:1fr;}
    .why-grid{grid-template-columns:1fr 1fr;}
    .contact-grid{grid-template-columns:1fr;}
    .foot-grid{grid-template-columns:1fr 1fr;}
    .admin-shell{grid-template-columns:1fr;}
    .admin-side{display:flex;overflow-x:auto;gap:6px;padding:14px;}
    .admin-side .a-brand{display:none;}
  }
  @media (max-width:680px){
    nav.links{display:none;}
    .menu-toggle{display:inline-flex;}
    .hero h1{font-size:32px;}
    .why-grid{grid-template-columns:1fr;}
    .two-col{grid-template-columns:1fr;}
    .foot-grid{grid-template-columns:1fr;}
    .spec-grid{grid-template-columns:1fr;}
    section{padding:56px 0;}
  }
  nav.links.mobile-open{
    display:flex;position:absolute;top:70px;left:0;right:0;background:var(--bg-dark);
    flex-direction:column;padding:16px 24px;gap:4px;border-bottom:1px solid var(--line-dark);
  }