/* Kệ Số – kiểu dáng chung cho trang chủ và trang giới thiệu từng app */
:root{--g:#0B6E4F;--g2:#08553D;--gl:#E7F4EE;--gx:#F3FAF6;--ink:#0F1F19;--mute:#5B6B64;--line:#DCE7E1;--bg:#FFFFFF;--warm:#FFF7E8;--r:18px;--hero1:#DDF1E7;--hero2:#F6FBF8;--deep:#0A3F2F}
/* trang của Kệ Số Thiết kế: tông xanh dương */
body.app-page .hero h1{font-size:clamp(30px,3.8vw,44px)}
body.tk{--g:#1F5F96;--g2:#174A76;--gl:#E3EDF8;--gx:#F3F7FC;--line:#DAE3EE;--hero1:#DCE8F6;--hero2:#F5F9FD;--deep:#12385A}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;font-family:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:var(--ink);background:var(--bg);line-height:1.55;-webkit-font-smoothing:antialiased}
a{color:inherit}img{max-width:100%;height:auto;display:block}
.wrap{max-width:1180px;margin:0 auto;padding:0 20px}
.btn{white-space:nowrap;display:inline-flex;align-items:center;justify-content:center;gap:8px;height:48px;padding:0 22px;border-radius:12px;font:inherit;font-weight:700;font-size:15px;text-decoration:none;cursor:pointer;border:1.5px solid var(--g);transition:.15s}
.btn.p{background:var(--g);color:#fff}.btn.p:hover{background:var(--g2)}
.btn.o{background:#fff;color:var(--g)}.btn.o:hover{background:var(--gx)}
.btn.sm{height:40px;padding:0 16px;font-size:14px;border-radius:999px}
.tag{display:inline-block;font-size:11.5px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--g);background:var(--gl);padding:5px 12px;border-radius:999px}
h1,h2,h3{line-height:1.2;margin:0}
h2{font-size:clamp(26px,3.4vw,36px);font-weight:800;letter-spacing:-.01em}
.sub{color:var(--mute)}
.ctr{text-align:center}.ctr .sub{max-width:640px;margin:10px auto 0}
section{padding:72px 0}
.alt{background:var(--gx)}
/* header */
header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.94);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.hd{display:flex;align-items:center;gap:20px;height:70px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none}
.logo b{white-space:nowrap;display:block;font-size:21px;font-weight:800;color:#0B6E4F;letter-spacing:.02em;line-height:1}
.logo span{display:block;font-size:11px;color:var(--mute);margin-top:3px}
.crumb{display:flex;align-items:center;gap:8px;font-weight:700;font-size:15px;color:var(--g);text-decoration:none;padding-left:14px;border-left:1px solid var(--line);white-space:nowrap}
.nav{display:flex;gap:26px;margin-left:auto}
.nav a.mo{display:none}
.nav a{text-decoration:none;font-weight:600;font-size:14.5px;color:#33463F}.nav a:hover{color:var(--g)}
.hb{display:flex;gap:10px}
.menu{display:none;margin-left:auto;background:none;border:0;width:44px;height:44px;border-radius:10px;cursor:pointer}
.ws{display:none;background:var(--warm);border-bottom:1px solid #F3DDB2;font-size:14px;text-align:center;padding:9px 16px}
.ws a{font-weight:700;color:var(--g2)}
/* hero */
.hero{background:radial-gradient(1100px 500px at 85% 10%,var(--hero1) 0,rgba(255,255,255,0) 60%),linear-gradient(180deg,var(--hero2),#fff);padding:56px 0 48px;overflow:hidden}
.hg{display:grid;grid-template-columns:minmax(0,1.02fr) minmax(0,1fr);gap:40px;align-items:center}
.hero h1{font-size:clamp(32px,4.4vw,50px);font-weight:800;letter-spacing:-.02em;margin:16px 0 18px;color:var(--deep)}
.hero h1 em{font-style:normal;color:var(--g)}
.hero p.lead{font-size:17px;color:#40534B;max-width:560px;margin:0}
.pts{display:flex;gap:18px;flex-wrap:wrap;margin:26px 0 30px}
.pts div{display:flex;gap:10px;align-items:center;font-size:13.5px;font-weight:600;color:#33463F}
.pts i{width:38px;height:38px;border-radius:50%;background:var(--gl);display:grid;place-items:center;flex:none}
.pts svg{stroke:var(--g)}
.ctas{display:flex;gap:12px;flex-wrap:wrap}
.dev{position:relative;min-height:400px}
.lap{position:relative;width:100%;max-width:600px;margin-left:auto}
.lap .scr{background:#1D2B26;border-radius:16px 16px 0 0;padding:12px 12px 0;box-shadow:0 30px 60px -20px rgba(8,40,61,.35)}
.lap .scr img{border-radius:6px 6px 0 0;aspect-ratio:16/10;object-fit:cover;object-position:top;width:100%}
.lap .base{height:16px;background:linear-gradient(#D4DDD8,#AEBBB4);border-radius:0 0 18px 18px;margin:0 -28px}
.phone{position:absolute;left:-8px;bottom:-26px;width:31%;max-width:180px;background:#14201C;border-radius:30px;padding:9px;box-shadow:0 26px 50px -16px rgba(8,40,61,.45)}
.phone img{border-radius:22px;aspect-ratio:9/18.5;object-fit:cover;object-position:top}
.phone.r{left:auto;right:-6px}
.bub{position:absolute;right:0;top:-18px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:10px 14px;font-size:13px;font-weight:600;box-shadow:0 10px 30px -10px rgba(0,0,0,.18)}
.bub b{color:var(--g)}
.bub.l{right:auto;left:10%;top:auto;bottom:-14px}
/* trang chủ: thẻ app lớn có ảnh */
.chips{display:flex;gap:8px;flex-wrap:wrap;margin:26px 0 22px}
.chips button{height:38px;padding:0 18px;border-radius:999px;border:1px solid var(--line);background:#fff;font:inherit;font-size:14px;font-weight:600;color:#33463F;cursor:pointer}
.chips button.on{background:var(--g);color:#fff;border-color:var(--g)}
.feat{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px;margin-top:30px}
.fa{border:1px solid var(--line);border-radius:22px;background:#fff;overflow:hidden;display:flex;flex-direction:column;transition:.18s;text-decoration:none}
.fa:hover{box-shadow:0 22px 44px -26px rgba(8,40,61,.45);transform:translateY(-3px)}
.fa .pic{position:relative;background:var(--c2,#EEF6F2);padding:22px 22px 0;height:250px;overflow:hidden}
.fa .pic img{border-radius:12px 12px 0 0;box-shadow:0 18px 40px -18px rgba(0,0,0,.35);width:100%;aspect-ratio:16/10;object-fit:cover;object-position:top}
.fa .pic img.ph{position:absolute;right:20px;bottom:-40px;width:26%;border-radius:16px;border:5px solid #14201C;aspect-ratio:9/18.5}
.fa .bd{padding:22px 24px 24px;display:flex;flex-direction:column;gap:10px;flex:1}
.fa .tt{display:flex;gap:12px;align-items:center}
.fa h3{font-size:21px;font-weight:800}
.fa .cat{font-size:12.5px;color:var(--mute);font-weight:600}
.fa p{margin:0;color:#40534B;font-size:14.5px}
.fa ul{list-style:none;padding:0;margin:4px 0 6px;display:grid;gap:6px;font-size:14px}
.fa li{display:flex;gap:8px}.fa li::before{content:"";flex:none;width:7px;height:7px;border-radius:50%;background:var(--c,#0B6E4F);margin-top:8px}
.fa .act{margin-top:auto;display:flex;gap:10px;align-items:center;flex-wrap:wrap;padding-top:6px}
.fa .from{font-size:13px;color:var(--mute);margin-left:auto}.fa .from b{color:var(--ink);font-size:15px}
.badge{font-size:11.5px;font-weight:700;padding:3px 10px;border-radius:999px;white-space:nowrap}
.badge.live{background:#DCFCE7;color:#166534}.badge.soon{background:#F1F5F9;color:#64748B}
.apps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin-top:18px}
.app{border:1px dashed var(--line);border-radius:16px;padding:16px;background:#FBFCFB;display:flex;gap:12px;align-items:flex-start}
.app h3{font-size:15.5px;font-weight:700;display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.app p{margin:4px 0 6px;font-size:13.5px;color:var(--mute)}
.app a{font-size:13.5px;font-weight:700;color:var(--g);text-decoration:none}
.app .ic{filter:saturate(.6)}
.ic{width:56px;height:56px;border-radius:16px;display:grid;place-items:center;flex:none}
.soonh{display:flex;justify-content:space-between;align-items:flex-end;gap:12px;flex-wrap:wrap;margin-top:44px}
.soonh h3{font-size:19px}
/* vì sao */
.why{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-top:30px}
.why div{padding:22px;border-radius:16px;border:1px solid var(--line);background:#fff}
.why i{width:44px;height:44px;border-radius:12px;background:var(--gl);display:grid;place-items:center;margin-bottom:12px}
.why i svg{stroke:var(--g)}
.why b{display:block;font-size:16px;margin-bottom:6px}.why span{font-size:14px;color:var(--mute)}
/* con số */
.nums{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;margin-top:30px}
.nums div{background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px;text-align:center}
.nums b{display:block;font-size:30px;font-weight:800;color:var(--g)}.nums span{font-size:13.5px;color:var(--mute)}
/* các bước */
.steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;margin-top:30px;counter-reset:s}
.st{border-radius:var(--r);padding:24px;background:var(--gx);border:1px solid var(--line);position:relative}
.st::before{counter-increment:s;content:counter(s);width:40px;height:40px;border-radius:50%;background:var(--g);color:#fff;font-weight:800;display:grid;place-items:center;margin-bottom:14px}
.st>b{font-size:17px;display:block;margin-bottom:6px}.st span{font-size:14.5px;color:#40534B}
/* đánh giá */
.revs{display:flex;flex-wrap:wrap;justify-content:center;gap:16px;margin-top:30px}.revs .rv{flex:0 1 calc((100% - 32px)/3);min-width:260px}
.rv{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px;display:flex;flex-direction:column;gap:12px}
.rv .stars{color:#F5A524;letter-spacing:2px;font-size:16px}
.rv p{margin:0;font-size:15px;color:#2B3C35}
.rv .who{display:flex;gap:10px;align-items:center;margin-top:auto}
.rv .av{width:40px;height:40px;border-radius:50%;background:var(--gl);color:var(--g);display:grid;place-items:center;font-weight:800;flex:none}
.rv .who b{display:block;font-size:14px}.rv .who span{font-size:12.5px;color:var(--mute)}
.rv .ap{font-size:11.5px;font-weight:700;color:var(--g);background:var(--gl);padding:2px 9px;border-radius:999px;align-self:flex-start}
/* trang app: khối tính năng xen kẽ */
.for{display:flex;gap:8px;flex-wrap:wrap;margin-top:18px}
.for span{background:#fff;border:1px solid var(--line);border-radius:999px;padding:7px 14px;font-size:13.5px;font-weight:600;color:#33463F}
.pain{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-top:28px}
.pain div{border-radius:16px;padding:20px;background:#fff;border:1px solid var(--line)}
.pain s{display:block;text-decoration:none;color:#B42318;font-size:13.5px;font-weight:600;margin-bottom:8px}
.pain b{display:block;font-size:15.5px}
.blk{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);gap:52px;align-items:center;margin-top:64px}
.blk.rev>:first-child{order:2}
.blk h3{font-size:clamp(22px,2.6vw,28px);font-weight:800;margin:12px 0 10px;letter-spacing:-.01em}
.blk p{color:#40534B;margin:0 0 6px;font-size:15.5px}
.list{list-style:none;padding:0;margin:16px 0 0;display:grid;gap:10px}
.list li{display:flex;gap:12px;align-items:flex-start;font-size:15px}
.list li i{flex:none;width:22px;height:22px;border-radius:50%;background:var(--g);display:grid;place-items:center;margin-top:2px}
.shot{border-radius:16px;overflow:hidden;border:1px solid var(--line);box-shadow:0 24px 50px -24px rgba(8,40,61,.4);background:#fff}
.shot img{width:100%;aspect-ratio:16/10;object-fit:cover;object-position:top}
.duo{display:flex;gap:16px;justify-content:center;align-items:flex-end}
.duo img{width:46%;max-width:250px;border-radius:24px;border:7px solid #14201C;box-shadow:0 24px 50px -24px rgba(8,40,61,.45);aspect-ratio:9/18.5;object-fit:cover;object-position:top}
.duo img:nth-child(2){margin-bottom:34px}
.grid4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;margin-top:30px}
.fc{border:1px solid var(--line);border-radius:16px;padding:18px;background:#fff}
.fc b{display:block;font-size:15px;margin:10px 0 4px}.fc span{font-size:13.5px;color:var(--mute)}
.fc i{width:42px;height:42px;border-radius:12px;background:var(--gl);display:grid;place-items:center}
.fc i svg{stroke:var(--g)}
.roles{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:14px;margin-top:28px}
.role{border-radius:16px;padding:18px;background:#fff;border:1px solid var(--line)}
.role b{display:block;font-size:15.5px;margin-bottom:6px;color:var(--g2)}.role span{font-size:13.5px;color:#40534B}
.gal{display:flex;gap:14px;overflow-x:auto;padding:6px 2px 14px;scroll-snap-type:x mandatory;margin-top:26px}
.gal figure{margin:0;flex:none;scroll-snap-align:start}
.gal img{height:420px;width:auto;border-radius:20px;border:6px solid #14201C}
.gal figcaption{font-size:13px;color:var(--mute);text-align:center;margin-top:8px;font-weight:600}
/* bảng giá */
.plans{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;margin-top:28px;align-items:stretch}
.plan{border:1px solid var(--line);border-radius:var(--r);padding:22px;display:flex;flex-direction:column;background:#fff;position:relative}
.plan.hot{border:2px solid var(--g);box-shadow:0 20px 44px -24px rgba(8,40,61,.5)}
.plan .hl{position:absolute;top:-12px;left:50%;transform:translateX(-50%);background:var(--g);color:#fff;font-size:12px;font-weight:700;padding:3px 14px;border-radius:999px;white-space:nowrap}
.plan h3{font-size:17px}.plan .nt{font-size:13px;color:var(--mute);margin-top:4px;min-height:40px}
.plan .pz{margin:14px 0 4px;font-size:30px;font-weight:800;color:var(--g2)}.plan .pz small{font-size:14px;font-weight:600;color:var(--mute)}
.plan .pm{font-size:12.5px;color:var(--mute);min-height:20px}
.plan ul{list-style:none;padding:0;margin:14px 0 18px;display:grid;gap:7px;font-size:13.5px}
.plan li{display:flex;gap:8px;align-items:flex-start}.plan li svg{flex:none;margin-top:3px;stroke:var(--g)}.plan li.no{color:#A3B1AA}.plan li.no svg{stroke:#A3B1AA}
.plan .btn{margin-top:auto;width:100%}
.pnote{font-size:13px;color:var(--mute);margin-top:16px}
/* hỏi đáp */
.faq{max-width:820px;margin:26px auto 0}
.faq details{border-bottom:1px solid var(--line);padding:16px 4px}
.faq summary{font-weight:700;cursor:pointer;font-size:16px;list-style:none;display:flex;justify-content:space-between;gap:12px}
.faq summary::after{content:"+";font-size:22px;color:var(--g);line-height:1}.faq details[open] summary::after{content:"–"}
.faq p{margin:10px 0 0;color:#40534B;font-size:15px}
.supbox{max-width:820px;margin:26px auto 0;text-align:center;font-size:15px;color:#40534B}.supbox a{color:var(--g);font-weight:700}
/* cta + footer */
.cta{background:var(--g2);color:#fff;border-radius:28px;padding:34px 36px;display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap;margin:0 auto}
.cta h2{font-size:26px}.cta p{margin:6px 0 0;color:rgba(255,255,255,.8)}
.cta .btn.o{border-color:#fff}
footer{padding:46px 0 34px;border-top:1px solid var(--line);margin-top:72px}
.ft{display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;align-items:center}
.ft nav{display:flex;gap:22px;flex-wrap:wrap}.ft nav a{text-decoration:none;font-size:14px;color:#40534B}
.copy{font-size:12.5px;color:var(--mute);margin-top:18px}
/* hộp chọn app khi đăng ký */
.md{position:fixed;inset:0;background:rgba(10,30,22,.55);z-index:50;display:none;align-items:center;justify-content:center;padding:16px}
.md.on{display:flex}
.mb{background:#fff;border-radius:22px;max-width:640px;width:100%;max-height:90vh;overflow:auto;padding:26px}
.mb .x{float:right;width:40px;height:40px;border-radius:50%;border:0;background:#F1F5F3;font-size:22px;cursor:pointer}
.mb h3{font-size:22px;margin-bottom:6px}
.pick{display:grid;gap:10px;margin-top:16px}
.pick a{display:flex;gap:14px;align-items:center;border:1.5px solid var(--line);border-radius:16px;padding:14px 16px;text-decoration:none}
.pick a:hover{border-color:var(--g);background:var(--gx)}.pick a b{display:block}.pick a span{font-size:13.5px;color:var(--mute)}
.pick a.off{opacity:.55;pointer-events:none}
/* thanh dùng thử dính dưới màn hình điện thoại (trang app) */
.sticky{display:none}
@media (max-width:980px){
  .hg,.blk{grid-template-columns:minmax(0,1fr)}.blk{gap:26px;margin-top:48px}.blk.rev>:first-child{order:0}
  .dev{min-height:auto;margin-top:20px}.phone{left:0;width:28%}
  .feat{grid-template-columns:1fr}.apps{grid-template-columns:repeat(2,minmax(0,1fr))}.grid4,.nums{grid-template-columns:repeat(2,minmax(0,1fr))}.why,.revs,.pain{grid-template-columns:1fr 1fr}
  .nav{display:none}.menu{display:block;margin-left:0}.hb{margin-left:auto}
  .nav.open{display:flex;position:absolute;top:70px;left:0;right:0;flex-direction:column;background:#fff;padding:16px 20px;border-bottom:1px solid var(--line);gap:14px}
}
@media (max-width:640px){
  section{padding:54px 0}.apps,.steps,.why,.revs,.pain{grid-template-columns:1fr}
  .hd{gap:8px}.logo span{display:none}.logo b{font-size:19px}.btn.sm{padding:0 12px;height:38px;font-size:13.5px}
  .crumb{padding-left:8px;font-size:14px}.crumb .ic{display:none}
  .bub{display:none}.cta{padding:26px 22px;border-radius:22px}.hero h1 br{display:none}
  .fa .pic{height:200px;padding:16px 16px 0}
  .gal img{height:340px}
  body.app-page{padding-bottom:74px}
  .app-page .hb .btn.o{display:none}.nav.open a.mo{display:block}
  .sticky{display:flex;gap:10px;position:fixed;left:0;right:0;bottom:0;z-index:30;background:#fff;border-top:1px solid var(--line);padding:12px 16px calc(12px + env(safe-area-inset-bottom));box-shadow:0 -10px 30px -18px rgba(0,0,0,.3)}
  .sticky .btn{flex:1;height:46px;padding:0 10px}
}