/* Điền Gia Phạm - giao diện (Roboto, nền trắng, lưới ảnh tràn viền, nút xanh bo tròn) */
:root{
  --ink:#1d1d1f; --txt:#4a4a4a; --mute:#777; --line:#e1e1e1; --soft:#f3f4f6;
  --blue:#0071e3; --blue-d:#005bb8; --foot:#555; --w:1200px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:70px}
body{font-family:Roboto,system-ui,-apple-system,"Segoe UI",Arial,sans-serif;font-size:16px;line-height:1.65;color:var(--txt);background:#fff;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%;height:auto}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
ul,ol{list-style:none}
h1,h2,h3,h4{color:var(--ink);line-height:1.25;font-weight:700}
.w{width:100%;max-width:var(--w);margin:0 auto;padding:0 24px}
.skip{position:absolute;left:-999px;top:0;background:#fff;padding:8px 14px;z-index:99}
.skip:focus{left:8px}
.small{font-size:14px;color:var(--mute)}

/* ---------- Thanh trên ---------- */
.bar{position:fixed;inset:0 0 auto;z-index:50;background:linear-gradient(#000a,#0000);transition:background .25s,box-shadow .25s}
.bar__in{display:flex;align-items:center;gap:28px;height:68px}
.logo{display:flex;align-items:center;gap:8px;font-weight:700;font-size:19px;color:#fff;white-space:nowrap}
.logo:hover{text-decoration:none}
.logo__mark{display:block;width:auto;height:32px;flex:none}
.menu{display:flex;align-items:center;gap:22px;flex:1}
.menu a{color:#fff;font-size:13px;font-weight:700;text-transform:uppercase;letter-spacing:.02em;opacity:.92}
.menu a:hover{opacity:1;text-decoration:none}
.menu__tel{margin-left:auto;border:1.5px solid currentColor;border-radius:99px;padding:6px 14px}
.bar.on{background:#fff;box-shadow:0 1px 8px #0002}
.bar.on .logo,.bar.on .menu a{color:var(--ink)}
.bar.on .menu__tel{color:var(--blue)}
.burger{display:none;margin-left:auto;width:40px;height:40px;background:none;border:0;cursor:pointer}
.burger span{display:block;width:22px;height:2px;background:#fff;margin:5px auto;transition:.2s}
.bar.on .burger span,.bar.open .burger span{background:var(--ink)}

/* ---------- Ảnh lớn đầu trang ---------- */
.hero{position:relative;height:min(92vh,820px);min-height:460px;overflow:hidden;background:#222}
.slide{position:absolute;inset:0;opacity:0;transition:opacity .9s ease}
.slide.on{opacity:1}
.slide img{width:100%;height:100%;object-fit:cover}
.hero__in{position:relative;height:100%;display:flex;align-items:center;pointer-events:none}
.info{pointer-events:auto;background:#6e6e6ecc;color:#fff;padding:18px 22px;max-width:300px;font-size:14px;line-height:1.6;box-shadow:0 6px 18px #0004}
.info>b{display:block;margin-bottom:2px}
.hero__nav{position:absolute;top:50%;transform:translateY(-50%);width:44px;height:44px;border:0;border-radius:50%;background:#0004;color:#fff;font-size:30px;line-height:40px;cursor:pointer;opacity:.75}
.hero__nav:hover{opacity:1;background:#0007}
.hero__nav--l{left:16px}.hero__nav--r{right:16px}
.dots{position:absolute;left:0;right:0;bottom:22px;display:flex;justify-content:center;gap:8px}
.dots button{width:10px;height:10px;border-radius:50%;border:2px solid #fff;background:transparent;cursor:pointer;padding:0}
.dots button.on{background:#fff}

/* ---------- Khối chữ chung ---------- */
.sec{padding:72px 0}
.sec--soft{background:var(--soft)}
.head{text-align:center;max-width:960px;margin:0 auto 34px}
.head h1,.head h2{font-size:clamp(26px,3.2vw,34px);margin-bottom:14px}
.head p{color:var(--txt)}
.kick{font-size:13px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--blue);margin-bottom:8px}

/* ---------- Tab và lưới công trình ---------- */
.tabs{display:flex;justify-content:center;gap:10px;margin-top:26px}
.tab{background:none;border:0;border-top:3px solid transparent;padding:10px 8px 4px;font:700 14px Roboto,sans-serif;text-transform:uppercase;color:var(--mute);cursor:pointer}
.tab.on{color:var(--ink);border-top-color:var(--blue)}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:3px}
.grid[hidden]{display:none}
.tile{position:relative;display:block;aspect-ratio:4/3;overflow:hidden;background:#ddd}
.tile img{width:100%;height:100%;object-fit:cover;transition:transform .6s ease}
.tile span{position:absolute;inset:auto 0 0;padding:60px 16px 16px;text-align:center;background:linear-gradient(#0000,#000a);color:#fff}
.tile b{display:block;font-size:14px;text-transform:uppercase;letter-spacing:.02em}
.tile i{display:block;font-style:normal;font-size:12px;text-transform:uppercase;opacity:.75}
.tile:hover{text-decoration:none}
.tile:hover img{transform:scale(1.06)}

/* ---------- Báo giá ---------- */
.price{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.pc__img{position:relative;aspect-ratio:5/6;overflow:hidden;background:#666}
.pc__img img{width:100%;height:100%;object-fit:cover;transition:transform .6s}
.pc:hover .pc__img img{transform:scale(1.05)}
.pc__img .pill{position:absolute;left:50%;bottom:18px;transform:translateX(-50%);white-space:nowrap}
.pc__n{display:block;color:var(--ink);font-size:18px;margin:14px 0 4px;text-align:center}
.pc__n s{display:block;font-size:13px;font-weight:400;color:var(--mute)}
.pc p{font-size:14px;text-align:center;color:var(--mute)}
.note{text-align:center;font-size:14px;color:var(--mute);margin-top:28px}
.pill{display:inline-block;background:var(--blue);color:#fff;border:0;border-radius:99px;padding:9px 22px;font:500 15px Roboto,sans-serif;cursor:pointer;transition:background .2s}
.pill:hover{background:var(--blue-d);text-decoration:none}
.pill--lg{padding:11px 30px;text-transform:uppercase}

/* ---------- Tại sao chọn ---------- */
.why{display:grid;grid-template-columns:5fr 7fr;gap:40px;align-items:center}
.why__pic img{width:100%;max-height:560px;object-fit:cover}
.why__r p{margin-top:18px}
.facts{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--line);border:1px solid var(--line)}
.facts div{background:#fff;padding:22px}
.facts b{display:block;color:var(--ink);font-size:22px}
.facts span{font-size:14px;color:var(--mute)}

/* ---------- Dịch vụ dạng hàng ảnh + chữ ---------- */
.row{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.row--rev .row__pic{order:2}
.row__pic img{width:100%;aspect-ratio:4/3;object-fit:cover}
.row__txt h2{font-size:clamp(24px,2.6vw,30px);margin-bottom:12px}
.list{margin-top:20px;border-top:1px solid var(--line)}
.list li{padding:12px 0;border-bottom:1px solid var(--line)}
.list b{display:block;color:var(--ink)}
.list span{font-size:15px}
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;counter-reset:b}
.steps li{background:#fff}
.steps img{width:100%;aspect-ratio:4/3;object-fit:cover}
.steps b{display:block;padding:12px 14px;color:var(--ink);font-size:15px;counter-increment:b}
.steps b::before{content:"Bước " counter(b) ": ";color:var(--blue)}
.pack{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:20px}
.card{background:#fff;padding:26px}
.card h3{font-size:19px;margin-bottom:12px}
.ticks li{position:relative;padding:5px 0 5px 26px}
.ticks li::before{content:"";position:absolute;left:2px;top:11px;width:12px;height:7px;border-left:2px solid var(--blue);border-bottom:2px solid var(--blue);transform:rotate(-45deg)}
.card .small{margin-top:12px}
.tv a{display:block;padding:11px 0;border-bottom:1px solid var(--line)}
.tv a:last-child{border-bottom:0}
.tv b{display:block;color:var(--ink)}
.tv span{font-size:14px;color:var(--mute)}
.tv a:hover b{color:var(--blue)}
.pledge{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:20px 0 16px}
.pledge div{border-left:3px solid var(--blue);background:var(--soft);padding:14px 16px}
.pledge h3{font-size:16px;margin-bottom:4px}
.pledge p{font-size:14px}

/* ---------- Về thầy ---------- */
.me{display:grid;grid-template-columns:4fr 6fr;gap:16px}
.me img{width:100%;height:100%;max-height:520px;object-fit:cover}

/* ---------- Hỏi đáp ---------- */
.faq{max-width:860px}
.faq details{border-bottom:1px solid var(--line)}
.faq summary{list-style:none;cursor:pointer;padding:16px 34px 16px 0;position:relative;color:var(--ink);font-weight:500}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:4px;top:12px;font-size:24px;color:var(--blue)}
.faq details[open] summary::after{content:"−"}
.faq details p{padding:0 0 16px}

/* ---------- Liên hệ ---------- */
.contact{position:relative;background:var(--soft);padding:0 0 40px}
.contact__band{height:200px;background:#e0e0e0}
.contact__box{position:relative;margin-top:-130px;display:grid;grid-template-columns:1fr 1fr;gap:36px;background:#fff;padding:44px 40px;max-width:calc(var(--w) - 48px);box-shadow:0 2px 14px #0001}
.contact__l h2{font-size:26px;padding-bottom:12px;border-bottom:1px solid var(--line);margin-bottom:20px}
.contact__l h2 span{color:var(--mute)}
.contact__l p{margin-bottom:14px}
.contact__tel a{font-size:24px;font-weight:700;color:var(--ink)}
.contact__tel small{display:block;color:var(--mute);font-size:13px}
.form label{display:block;font-size:13px;font-weight:700;color:var(--txt);margin-bottom:12px}
.form input,.form select{display:block;width:100%;margin-top:5px;padding:10px 12px;border:1px solid #ccc;border-radius:2px;font:16px Roboto,sans-serif;color:var(--ink);background:#fff}
.form input:focus,.form select:focus{outline:2px solid var(--blue);outline-offset:-1px;border-color:var(--blue)}
.form__msg{margin-top:10px;font-size:14px;color:var(--blue-d);min-height:1.4em}

/* ---------- Chân trang ---------- */
.foot{background:var(--foot);color:#eee;padding:56px 0 30px;font-size:14px}
.foot a{color:#fff}
.foot__cols{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:30px}
.foot h4{color:#fff;font-size:16px;margin-bottom:16px}
.foot__c li{display:flex;gap:10px;align-items:baseline;margin-bottom:12px}
.foot__c span{width:18px;flex:none;text-align:center}
.foot__l li{border-bottom:1px solid #ffffff26;padding:7px 0 7px 16px;position:relative}
.foot__l li::before{content:"›";position:absolute;left:0;color:#f0b849}
.foot__copy{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;margin-top:44px;padding-top:18px;border-top:1px solid #ffffff40}
.foot__brand{display:flex;align-items:center;gap:10px}
.foot__brand img{height:28px;width:auto}
.foot__soc{display:flex;gap:14px}
.foot__soc a{font-weight:700}

/* ---------- Nút Zalo nổi, xem ảnh lớn ---------- */
.zalo{position:fixed;right:18px;bottom:18px;z-index:40;width:56px;height:56px;border-radius:50%;background:var(--blue);color:#fff;display:grid;place-items:center;font-weight:700;font-size:14px;box-shadow:0 4px 14px #0004}
.zalo:hover{text-decoration:none;background:var(--blue-d)}
.lb{position:fixed;inset:0;z-index:60;background:#000e;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:20px}
.lb[hidden]{display:none}
.lb img{max-height:84vh;width:auto}
.lb p{color:#ddd;margin-top:12px;text-align:center}
.lb button{position:absolute;top:10px;right:16px;background:none;border:0;color:#fff;font-size:40px;cursor:pointer}

/* ---------- Trang Thước Lỗ Ban ---------- */
.page{padding-top:68px}
.lbx{padding:28px 0 40px}
.lb-in{display:flex;flex-wrap:wrap;align-items:center;gap:10px 18px}
.lb-in label{font-weight:700;color:var(--ink)}
.lb-in__o{display:flex;align-items:center;gap:6px}
.lb-in__o input{width:150px;padding:9px 10px;font:700 24px Roboto,sans-serif;color:#d0021b;text-align:center;border:2px solid #f0b849;border-radius:6px;background:#fffbea;-moz-appearance:textfield}
.lb-in__o input::-webkit-inner-spin-button,.lb-in__o input::-webkit-outer-spin-button{-webkit-appearance:none;margin:0}
.lb-in__o button{width:38px;height:38px;border:1px solid #ccc;border-radius:50%;background:#fff;font-size:20px;cursor:pointer;color:var(--ink)}
.lb-in__o button:hover{border-color:var(--blue);color:var(--blue)}
.lb-in__o span{color:var(--mute)}
.lb-in__vd{font-size:14px;color:var(--mute)}
.lb-in__vd button{margin-left:6px;border:1px solid var(--line);background:var(--soft);border-radius:99px;padding:3px 11px;font:14px Roboto,sans-serif;cursor:pointer;color:var(--ink)}
.lb-in__vd button:hover{border-color:var(--blue);color:var(--blue)}
.lb-kq{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:20px 0 22px}
.lbk{display:flex;gap:12px;align-items:flex-start;padding:14px 16px;border:1px solid var(--line);border-left:4px solid #999}
.lbk--tot{border-left-color:#d0021b;background:#fff5f5}
.lbk--xau{background:#f6f6f6}
.lbk__nhan{flex:none;min-width:44px;text-align:center;font-size:13px;color:#fff;background:#777;border-radius:4px;padding:3px 6px;text-transform:uppercase}
.lbk--tot .lbk__nhan{background:#d0021b}
.lbk__t{font-size:13px;color:var(--mute)}
.lbk__c{font-size:17px;color:var(--ink)}
.lbk--tot .lbk__c b{color:#d0021b}
.lbk__g{font-size:13px;margin-top:4px}
.lbk__g button{border:0;background:none;color:var(--blue);font:700 13px Roboto,sans-serif;cursor:pointer;padding:0;text-decoration:underline}
.lb-thuoc{display:grid;gap:16px}
.lbt__t{font-size:14px;margin-bottom:4px;color:var(--txt)}
.lbt__t b{color:var(--ink)}
.lbt canvas{display:block;width:100%;border-top:1px solid #ccc;border-bottom:2px solid #555;cursor:grab;touch-action:pan-y;user-select:none}
.lbt canvas:active{cursor:grabbing}
.lbt canvas:focus-visible{outline:2px solid var(--blue)}
.lb-goi{margin-top:14px}
.lb-link{margin-top:22px}
.page .head h1{font-size:clamp(26px,3.2vw,34px)}
.menu a[aria-current]{text-decoration:underline;text-underline-offset:6px}
@media (max-width:860px){.lb-kq{grid-template-columns:1fr}}

/* ---------- Menu con ---------- */
.dd{position:relative}
.dd__t::after{content:"";display:inline-block;margin-left:6px;border:4px solid transparent;border-top-color:currentColor;border-bottom:0;vertical-align:middle}
.sub{position:absolute;top:100%;left:-14px;min-width:210px;background:#fff;box-shadow:0 10px 24px #0003;padding:6px 0;display:none;z-index:30}
.dd:hover .sub,.dd:focus-within .sub{display:block}
.dd::after{content:"";position:absolute;left:0;right:0;top:100%;height:14px}
.menu .sub a{display:block;color:var(--ink);padding:9px 16px;text-transform:none;font-size:14px;font-weight:500;opacity:1;white-space:nowrap}
.menu .sub a:hover{background:#f2f2f2;color:var(--blue)}
.sub{margin-top:10px}
.price--3{grid-template-columns:repeat(3,1fr);margin-top:28px}
.price--3 .pc__img{aspect-ratio:4/3}
.pc[id]{scroll-margin-top:90px}

/* ---------- Màn vừa và nhỏ ---------- */
@media (max-width:1020px){
  .burger{display:block}
  .menu{position:fixed;inset:68px 0 auto;flex-direction:column;align-items:stretch;gap:0;background:#fff;padding:8px 24px 20px;box-shadow:0 8px 16px #0002;transform:translateY(-130%);transition:transform .25s}
  .menu.open{transform:none}
  .menu a{color:var(--ink);padding:13px 0;border-bottom:1px solid var(--line);opacity:1}
  .menu__tel{margin:14px 0 0;text-align:center;color:var(--blue)!important}
  .menu{max-height:calc(100vh - 68px);overflow-y:auto}
  .dd__t::after{display:none}
  .menu .dd__t{display:block}
  .sub,.dd:hover .sub{display:block;position:static;box-shadow:none;padding:0 0 6px 16px;margin:0;min-width:0}
  .dd::after{display:none}
  .menu .sub a{padding:10px 0;font-size:14px;border-bottom:1px dashed var(--line)}
  .bar.open{background:#fff}
  .bar.open .logo{color:var(--ink)}
  .price{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
  .foot__cols{grid-template-columns:1fr 1fr}
}
@media (max-width:860px){
  .grid{grid-template-columns:repeat(2,1fr)}
  .why,.row,.pack,.me,.contact__box{grid-template-columns:1fr}
  .row--rev .row__pic{order:0}
  .why__pic img{max-height:420px}
  .contact__box{padding:30px 22px}
}
@media (max-width:560px){
  .sec{padding:52px 0}
  .w{padding:0 18px}
  .contact__band{height:110px}
  .contact__box{margin:-70px 12px 0;width:auto;padding:28px 18px}
  .contact__l h2{font-size:22px}
  .hero{height:72vh;min-height:420px}
  .hero__in{align-items:flex-end;padding-bottom:56px}
  .info{max-width:none;width:100%;font-size:13px;padding:12px 16px}
  .hero__nav{display:none}
  .tabs{gap:4px}
  .tab{font-size:12.5px}
  .grid{grid-template-columns:1fr}
  .price,.price--3{grid-template-columns:1fr 1fr;gap:14px}
  .pc__img .pill{font-size:13px;padding:7px 14px}
  .pc__n{font-size:15px}
  .facts b{font-size:18px}
  .facts div{padding:16px}
  .pledge{grid-template-columns:1fr}
  .foot__cols{grid-template-columns:1fr}
  .foot__copy{flex-direction:column;text-align:center}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}