/* Iphanmem — giao diện B2B: nền sáng, chữ đậm, màu nhấn xanh dương. Mọi màu là token; có bản tối theo hệ điều hành. */
:root{
  --bg:#f5f7fa; --surface:#fff; --surface2:#eef2f7; --ink:#0e1a2b; --muted:#566377; --line:#dde3ec;
  --accent:#1457d6; --accent-ink:#fff; --accent-soft:#e6eefc; --good:#0f7a4a; --good-bg:#e1f4ea;
  --shadow:0 1px 2px rgba(14,26,43,.06),0 8px 24px rgba(14,26,43,.07);
  --sans:'Be Vietnam Pro',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;
  --mono:'JetBrains Mono',ui-monospace,Consolas,monospace;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#0b121c; --surface:#131c29; --surface2:#1a2535; --ink:#e8eef7; --muted:#97a5ba; --line:#243349;
  --accent:#6a9bff; --accent-ink:#07142b; --accent-soft:#16294a; --good:#4fd18b; --good-bg:#11301f;
  --shadow:0 1px 2px rgba(0,0,0,.4),0 8px 24px rgba(0,0,0,.3); color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#0b121c; --surface:#131c29; --surface2:#1a2535; --ink:#e8eef7; --muted:#97a5ba; --line:#243349;
  --accent:#6a9bff; --accent-ink:#07142b; --accent-soft:#16294a; --good:#4fd18b; --good-bg:#11301f;
  --shadow:0 1px 2px rgba(0,0,0,.4),0 8px 24px rgba(0,0,0,.3); color-scheme:dark}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:400 15px/1.6 var(--sans)}
a{color:inherit;text-decoration:none}
h1,h2,h3{margin:0;line-height:1.2;text-wrap:balance}
p{margin:0}
img,svg{max-width:100%}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.wrap{max-width:1120px;margin-inline:auto;padding-inline:16px}
.muted{color:var(--muted)}
.eyebrow{font-size:12px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--accent)}
.mono{font-family:var(--mono);font-size:13px}
/* header */
.site-h{background:var(--surface);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}
.site-h .wrap{display:flex;align-items:center;gap:20px;height:64px}
.logo{display:flex;align-items:center;gap:9px;font-weight:700;font-size:18px;letter-spacing:-.01em}
.logo i{width:28px;height:28px;border-radius:8px;background:var(--accent);display:grid;place-items:center}
.logo i::after{content:"";width:11px;height:11px;border:2px solid var(--accent-ink);border-radius:3px}
.logo b{color:var(--accent);font-weight:700}
.site-h nav{display:flex;gap:2px;flex:1}
.site-h nav a{padding:7px 12px;border-radius:8px;color:var(--muted);font-weight:500}
.site-h nav a:hover,.site-h nav a[aria-current]{color:var(--ink);background:var(--surface2)}
.site-h .menu-btn{display:none;margin-left:auto}
@media(max-width:820px){
  .site-h .menu-btn{display:inline-flex}
  .site-h .wrap{flex-wrap:wrap;height:auto;min-height:64px;padding-block:10px}
  .site-h nav{display:none;order:3;flex-basis:100%;flex-direction:column}
  .site-h nav.open{display:flex}
  .site-h .cta-h{display:none}
}
/* nút */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;height:40px;padding:0 18px;border-radius:9px;border:1px solid var(--line);background:var(--surface);color:var(--ink);font:600 14px var(--sans);cursor:pointer;white-space:nowrap}
.btn:hover{border-color:var(--accent)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.btn.primary:hover{filter:brightness(1.08)}
.btn.lg{height:48px;padding:0 26px;font-size:15px}
.btn.sm{height:32px;padding:0 12px;font-size:13px}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.pill{display:inline-flex;align-items:center;height:24px;padding:0 10px;border-radius:99px;font-size:12px;font-weight:600;background:var(--accent-soft);color:var(--accent)}
/* bố cục */
.hero{padding-block:64px 48px;display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr);gap:40px;align-items:center}
.hero h1{font-size:clamp(32px,5vw,52px);font-weight:700;letter-spacing:-.025em;margin:12px 0 16px}
.hero .lead{font-size:17px;color:var(--muted);max-width:52ch}
.hero.compact{padding-block:48px 24px}
@media(max-width:860px){.hero{grid-template-columns:minmax(0,1fr);padding-block:36px 24px}}
.sec{padding-block:44px}
.sec h2{font-size:26px;font-weight:700;letter-spacing:-.015em;margin-bottom:8px}
.sec .sub{color:var(--muted);margin-bottom:24px;max-width:62ch}
.grid{display:grid;gap:16px}
.g2{grid-template-columns:repeat(2,minmax(0,1fr))}
.g3{grid-template-columns:repeat(3,minmax(0,1fr))}
.g4{grid-template-columns:repeat(4,minmax(0,1fr))}
@media(max-width:860px){.g3,.g4{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:600px){.g2,.g3,.g4{grid-template-columns:minmax(0,1fr)}}
.card{background:var(--surface);border:1px solid var(--line);border-radius:12px}
.card.pad{padding:22px}
.pcard{padding:24px;display:flex;flex-direction:column;gap:10px}
.pcard h3{font-size:20px}
.pcard .pill{align-self:flex-start}
.pcard .btn{align-self:flex-start;margin-top:auto}
.feat{padding:18px;display:flex;flex-direction:column;gap:6px}
.feat b{font-size:15px}
.feat span{color:var(--muted)}
.viz{padding:16px;box-shadow:var(--shadow)}
.viz svg{display:block;width:100%;height:auto}
.viz .cap{font-size:12px;color:var(--muted);margin-top:8px}
.steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;list-style:none;padding:0;margin:0;counter-reset:s}
@media(max-width:860px){.steps{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:600px){.steps{grid-template-columns:minmax(0,1fr)}}
.steps li{counter-increment:s;padding:18px;border-top:2px solid var(--accent);background:var(--surface);border-radius:0 0 10px 10px}
.steps li::before{content:"Bước " counter(s);display:block;font-size:12px;font-weight:600;color:var(--accent);margin-bottom:4px}
.steps b{display:block;margin-bottom:2px}
.steps span{color:var(--muted)}
.band{background:var(--ink);color:var(--bg);border-radius:14px;padding:32px;display:flex;gap:20px;justify-content:space-between;align-items:center;flex-wrap:wrap}
.band h2{font-size:22px;margin:0}
.band .btn{border-color:transparent}
.ph{border:1.5px dashed var(--line);border-radius:12px;padding:28px;color:var(--muted);text-align:center;background:var(--surface2)}
.ph b{color:var(--ink)}
table{border-collapse:collapse;width:100%}
td,th{padding:10px 14px;text-align:left;border-top:1px solid var(--line)}
tr:first-child td{border-top:0}
td:first-child{color:var(--muted);width:38%}
details{border-bottom:1px solid var(--line);padding:14px 0}
details summary{cursor:pointer;font-weight:600}
details p{color:var(--muted);margin-top:8px;max-width:70ch}
/* bảng giá */
.seg{display:inline-flex;background:var(--surface2);border-radius:10px;padding:3px;gap:2px;flex-wrap:wrap}
.seg button{border:0;background:transparent;color:var(--muted);font:600 13.5px var(--sans);height:34px;padding:0 15px;border-radius:8px;cursor:pointer}
.seg button.on{background:var(--surface);color:var(--ink);box-shadow:var(--shadow)}
.js .panel:not(.on){display:none}
.bar-row{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;align-items:center;margin-bottom:20px}
.plan{padding:24px;display:flex;flex-direction:column;gap:12px}
.plan.hl{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent)}
.plan .price{font-size:30px;font-weight:700;letter-spacing:-.02em;font-variant-numeric:tabular-nums}
.plan .price small{font-size:13px;color:var(--muted);font-weight:500;letter-spacing:0}
.plan ul{list-style:none;padding:0;margin:0;display:grid;gap:8px}
.plan li{padding-left:22px;position:relative}
.plan li::before{content:"";position:absolute;left:3px;top:.5em;width:9px;height:5px;border-left:2px solid var(--accent);border-bottom:2px solid var(--accent);transform:rotate(-45deg)}
.plan .btn{margin-top:auto}
.old{color:var(--muted);text-decoration:line-through;font-size:13px}
/* form */
form.card{display:grid;gap:14px}
label.f{display:grid;gap:5px;font-weight:500;font-size:13.5px}
input,select,textarea{font:inherit;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:9px 12px;width:100%;max-width:100%}
.notice{padding:12px 16px;border-radius:10px;background:var(--accent-soft);color:var(--accent);font-weight:500}
/* footer */
.foot{margin-top:48px;border-top:1px solid var(--line);background:var(--surface)}
.foot .wrap{padding-block:32px;display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:24px;font-size:14px}
@media(max-width:700px){.foot .wrap{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}}
.foot h4{margin:0 0 8px;font-size:13px;color:var(--muted);font-weight:600;letter-spacing:.04em;text-transform:uppercase}
.foot a{display:block;padding:3px 0;color:var(--ink)}
.foot a:hover{color:var(--accent)}
.legal{border-top:1px solid var(--line);padding-block:14px;color:var(--muted);font-size:13px}
svg text{font-family:var(--sans);fill:var(--muted);font-size:11px}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
/* giá IB và trang tải xuống */
.logo b{color:var(--accent)}
.ibprice{font-size:15px;color:var(--muted);font-weight:500}
.ibprice span{font-size:34px;font-weight:700;color:var(--ink);letter-spacing:-.02em;margin-left:4px}
.meta{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px 16px;margin:16px 0}
.meta div{min-width:0}
.meta dt{font-size:12px;color:var(--muted)}
.meta dd{margin:0;font-weight:600;font-variant-numeric:tabular-nums}
.hashrow{display:flex;gap:10px;align-items:center;flex-wrap:wrap;padding:10px 12px;background:var(--surface2);border-radius:8px}
.hashrow code{flex:1;min-width:0;overflow-wrap:anywhere}
.btn[aria-disabled="true"]{opacity:.55;pointer-events:none}
.rel ul{margin:8px 0 0;padding-left:18px}
.code{margin:16px 0 0;padding:14px 16px;background:var(--surface2);border:1px solid var(--line);border-radius:10px;overflow-x:auto}
.rel{scroll-margin-top:84px}
/* nút Zalo nổi */
.zalo-fab{position:fixed;right:16px;bottom:calc(16px + env(safe-area-inset-bottom,0px));z-index:15;background:var(--accent);color:var(--accent-ink);font-weight:600;padding:11px 18px;border-radius:99px;box-shadow:var(--shadow)}
.zalo-fab:hover{filter:brightness(1.08)}
/* chân trang: không để email dài làm tràn ngang trên điện thoại */
.foot .wrap>div{min-width:0}
.foot .wrap{grid-template-columns:1.2fr .7fr .8fr 1.5fr}
@media(max-width:900px){.foot .wrap{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:520px){.foot .wrap{grid-template-columns:minmax(0,1fr)}.foot a{overflow-wrap:anywhere}}
.foot .wrap.legal{display:block}
.foot a.logo{display:flex}