/* ============================================================
   base.css — LogiVerse hub. Hướng "Atlas Corporate" (bám _reference/image.png, 2026-07-25).
   Tập đoàn có bốn nền tảng con: hero ảnh phủ lớp tối, thẻ nền tảng chồng lên hero,
   mật độ thông tin cao, chữ vừa phải. Token đồng bộ DESIGN.md.
   ============================================================ */

/* ---------- tokens ---------- */
:root{
  --ink:#2D0D5A;
  --ink-deep:#1B0637;
  --ink-card:#26094B;
  --ink-soft:#463270;
  --violet:#7A1FE0;
  --magenta:#FF3C9D;
  --magenta-ink:#C81A76;
  --paper:#FFFFFF;
  --surface:#F5F2FA;
  --line:#E2DAF0;
  --live:#0F7A4A;
  --pending:#6B5B8A;

  --on-ink:#FFFFFF;
  --on-ink-soft:#CBB8E8;
  --on-ink-line:rgba(255,255,255,.16);

  --ease:cubic-bezier(.16,1,.3,1);
  --shell:1240px;
  --pad:24px;

  --z-header:100;
  --z-menu:200;
}

/* ---------- mechanics ---------- */
html{ -webkit-text-size-adjust:100%; -webkit-tap-highlight-color:transparent; scroll-behavior:smooth; scroll-padding-top:80px; }
*,*::before,*::after{ box-sizing:border-box; }
body{
  margin:0; background:var(--paper); color:var(--ink);
  font-family:'Be Vietnam Pro',system-ui,-apple-system,sans-serif;
  font-size:16px; line-height:1.65; -webkit-font-smoothing:antialiased;
}
img{ max-width:100%; display:block; }
a{ color:inherit; }

/* ---------- type ---------- */
h1,h2,h3,h4{ font-family:'Faustina','Times New Roman',serif; margin:0; text-wrap:balance; font-weight:600; }
h1{ font-size:clamp(2rem,3.6vw,3.15rem); line-height:1.14; letter-spacing:-.015em; font-weight:700; }
h2{ font-size:clamp(1.55rem,2.4vw,2.2rem); line-height:1.2; letter-spacing:-.012em; }
h3{ font-size:clamp(1.1rem,1.4vw,1.32rem); line-height:1.3; letter-spacing:-.008em; }
h4{ font-size:1.02rem; line-height:1.35; }
p{ margin:0; text-wrap:pretty; }
strong{ font-weight:600; }
.lede{ font-size:1.05rem; line-height:1.62; color:var(--ink-soft); max-width:60ch; }
.body-col{ color:var(--ink-soft); max-width:62ch; }
.label{ font-size:.76rem; font-weight:600; letter-spacing:.09em; text-transform:uppercase; color:var(--magenta-ink); }

/* ---------- layout ---------- */
.shell{ width:100%; max-width:var(--shell); margin-inline:auto; padding-inline:var(--pad); }
.section{ padding-block:clamp(52px,6vw,84px); }
.band{ background:var(--ink); color:var(--on-ink); }
.band h2,.band h3,.band h4{ color:var(--on-ink); }
.band .lede,.band .body-col{ color:var(--on-ink-soft); }
.band .label{ color:var(--magenta); }

/* ---------- header ---------- */
.header{
  position:absolute; inset:0 0 auto; z-index:var(--z-header);
  background:transparent; border-bottom:1px solid rgba(255,255,255,.14);
}
/* nav nằm ở nửa phải hero, nơi scrim chỉ 30%: cần dải tối riêng để chữ trắng luôn đủ tương phản */
.header::before{
  content:""; position:absolute; inset:0; z-index:-1; pointer-events:none;
  background:linear-gradient(180deg, rgba(27,6,55,.88) 0%, rgba(27,6,55,.52) 70%, rgba(27,6,55,0) 100%);
}
.header__in{ display:flex; align-items:center; justify-content:space-between; gap:24px; height:76px; }
.brand{
  display:inline-flex; align-items:center; gap:10px; text-decoration:none;
  font-family:'Faustina',serif; font-weight:700; font-size:1.3rem; letter-spacing:-.01em; color:var(--on-ink);
}
.brand__mark{ width:32px; height:32px; flex:none; }
.brand__text{ display:inline-flex; align-items:baseline; gap:1px; }
.brand__text span:last-child{ color:var(--magenta); }
.nav{ display:flex; align-items:center; gap:30px; margin-left:auto; }
.nav a{
  text-decoration:none; font-size:.92rem; font-weight:500; color:rgba(255,255,255,.82);
  padding:8px 0; border-bottom:2px solid transparent;
  transition:color .18s var(--ease), border-color .18s var(--ease);
}
.nav a:hover{ color:var(--on-ink); border-bottom-color:var(--magenta); }
@media (min-width:861px){ .nav.hidden{ display:flex; } }
.header .btn{ margin-left:8px; }
.menu-btn{ display:none; }

/* ---------- buttons ---------- */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:9px;
  border-radius:3px; text-decoration:none; cursor:pointer;
  font-family:'Be Vietnam Pro',sans-serif; font-weight:600; font-size:.92rem; line-height:1;
  padding:13px 20px; min-height:44px;
  background:var(--ink); color:var(--on-ink); border:1.5px solid var(--ink);
  transition:background-color .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease);
}
.btn svg{ transition:transform .18s var(--ease); flex:none; }
.btn:hover{ background:#3F1478; border-color:#3F1478; }
.btn:hover svg{ transform:translateX(3px); }
.btn:active{ background:var(--ink); }
.btn--light{ background:var(--paper); color:var(--ink); border-color:var(--paper); }
.btn--light:hover{ background:var(--magenta); color:var(--ink); border-color:var(--magenta); }
.btn--ghost{ background:transparent; color:var(--on-ink); border-color:rgba(255,255,255,.45); }
.btn--ghost:hover{ background:rgba(255,255,255,.12); border-color:var(--on-ink); }
.btn--sm{ padding:10px 15px; min-height:40px; font-size:.85rem; }

.link-go{
  display:inline-flex; align-items:center; gap:8px; text-decoration:none;
  font-weight:600; font-size:.9rem; color:var(--ink); padding-block:4px;
  border-bottom:2px solid var(--magenta); transition:color .18s var(--ease);
}
.link-go svg{ transition:transform .18s var(--ease); }
.link-go:hover{ color:var(--magenta-ink); }
.link-go:hover svg{ transform:translateX(4px); }

:where(a,button,summary):focus-visible{ outline:2px solid var(--violet); outline-offset:2px; border-radius:2px; }
.band :where(a,button,summary):focus-visible,.hero :where(a,button,summary):focus-visible,
.footer :where(a,button,summary):focus-visible,.units :where(a,button,summary):focus-visible{ outline-color:var(--magenta); }

/* ---------- hero ---------- */
.hero{ position:relative; background:var(--ink-deep); color:var(--on-ink); isolation:isolate; }
.hero__bg{ position:absolute; inset:0; z-index:-2; overflow:hidden; }
.hero__bg img{ width:100%; height:100%; object-fit:cover; object-position:50% 46%; }
/* scrim cho ảnh nền: đậm bên trái để chữ đạt tương phản, nhạt bên phải để ảnh cảng còn đọc được */
.hero__bg::after{
  content:""; position:absolute; inset:0;
  background:linear-gradient(90deg, rgba(27,6,55,.92) 0%, rgba(27,6,55,.74) 44%, rgba(27,6,55,.30) 100%);
}
.hero__in{ padding-top:clamp(140px,15vw,190px); padding-bottom:clamp(96px,11vw,150px); }
.hero__copy{ max-width:640px; }
.hero h1{ color:var(--on-ink); margin-top:14px; }
.hero__sub{ color:rgba(255,255,255,.86); font-size:1.02rem; line-height:1.62; margin-top:16px; max-width:52ch; }
.hero__cta{ display:flex; flex-wrap:wrap; gap:12px; margin-top:26px; }
.hero__note{ margin-top:20px; color:rgba(203,184,232,.9); font-size:.85rem; }

/* ---------- units (4 nền tảng, thẻ chồng lên hero) ---------- */
.units{ background:var(--ink); color:var(--on-ink); padding-bottom:clamp(52px,6vw,80px); }
.units__grid{
  display:grid; grid-template-columns:repeat(4,minmax(0,1fr)); gap:20px;
  margin-top:clamp(-104px,-9vw,-72px); position:relative; z-index:1;
}
.unit{
  display:flex; flex-direction:column; background:var(--ink-card);
  border:1px solid rgba(255,255,255,.12); border-radius:4px; overflow:hidden;
  transition:border-color .2s var(--ease), transform .2s var(--ease);
}
.unit:hover{ border-color:var(--magenta); transform:translateY(-3px); }
/* flex item: phải khoá height, aspect-ratio bị chiều cao nội tại của ảnh ghi đè */
.unit__shot{ flex:none; width:100%; height:clamp(148px,13vw,186px); object-fit:cover; object-position:50% 0; background:var(--ink-deep); }
.unit__body{ padding:18px 18px 20px; display:flex; flex-direction:column; gap:9px; flex:1; }
.unit__name{ color:var(--on-ink); }
.unit__desc{ color:var(--on-ink-soft); font-size:.88rem; line-height:1.55; flex:1; }
.unit__foot{ display:flex; align-items:center; justify-content:flex-start; gap:12px; margin-top:6px; }
.unit--soon{ background:rgba(255,255,255,.05); }
.unit--soon .unit__shot{ filter:grayscale(.9) brightness(.6); }
.unit__soon{
  display:inline-flex; align-items:center; min-height:40px; padding:10px 15px;
  border:1.5px solid rgba(255,255,255,.28); border-radius:3px;
  font-size:.85rem; font-weight:600; color:var(--on-ink-soft);
}

/* ---------- about + nguyên tắc ---------- */
.about{ display:grid; grid-template-columns:minmax(0,5fr) minmax(0,7fr); gap:clamp(28px,4vw,64px); align-items:center; }
.about__img{ width:100%; height:clamp(190px,20vw,250px); object-fit:cover; border-radius:4px; margin-top:20px; }
.about__note{ margin-top:16px; font-size:.88rem; color:var(--pending); }
.grid2{ display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:26px 32px; margin-top:22px; }
.feat{ display:grid; grid-template-columns:40px minmax(0,1fr); gap:14px; align-items:start; }
.feat__ic{
  width:40px; height:40px; display:grid; place-items:center; border-radius:3px;
  background:var(--surface); color:var(--violet); border:1px solid var(--line);
}
.feat h4{ margin-bottom:5px; }
.feat p{ font-size:.9rem; line-height:1.58; color:var(--ink-soft); }

/* ---------- loop ---------- */
.loop{ display:grid; grid-template-columns:repeat(4,minmax(0,1fr)); gap:24px; margin-top:26px; }
.loop__step{ padding-top:20px; border-top:2px solid var(--on-ink-line); position:relative; }
.loop__step::before{ content:""; position:absolute; top:-6px; left:0; width:10px; height:10px; background:var(--magenta); border-radius:2px; }
.loop__step h4{ margin-bottom:6px; }
.loop__step p{ font-size:.88rem; line-height:1.55; color:var(--on-ink-soft); }

/* ---------- faq + liên hệ ---------- */
.close{ display:grid; grid-template-columns:minmax(0,7fr) minmax(0,5fr); gap:clamp(28px,4vw,64px); align-items:start; }
.faq{ border-top:1px solid var(--line); margin-top:18px; }
.faq details{ border-bottom:1px solid var(--line); }
.faq summary{
  display:flex; align-items:flex-start; justify-content:space-between; gap:20px;
  padding:16px 0; cursor:pointer; list-style:none;
  font-family:'Faustina',serif; font-weight:600; font-size:1rem; line-height:1.4;
  transition:color .18s var(--ease);
}
.faq summary::-webkit-details-marker{ display:none; }
.faq summary:hover{ color:var(--magenta-ink); }
.faq summary::after{ content:"+"; font-weight:500; color:var(--pending); flex:none; }
.faq details[open] summary::after{ content:"–"; }
.faq__a{ padding:0 0 18px; color:var(--ink-soft); font-size:.94rem; max-width:64ch; }

.card-contact{ background:var(--surface); border:1px solid var(--line); border-radius:4px; padding:24px; }
.card-contact h3{ margin-bottom:10px; }
.sites{ list-style:none; margin:16px 0 0; padding:0; display:grid; gap:1px; background:var(--line); border:1px solid var(--line); border-radius:3px; overflow:hidden; }
.sites li{ background:var(--paper); }
.sites a,.sites span{
  display:flex; align-items:center; justify-content:space-between; gap:12px;
  padding:12px 14px; text-decoration:none; font-weight:600; font-size:.92rem; color:var(--ink);
  transition:background-color .16s var(--ease), color .16s var(--ease);
}
.sites a:hover{ background:var(--ink); color:var(--on-ink); }
.sites .dom{ font-weight:400; font-size:.82rem; color:var(--pending); }
.sites a:hover .dom{ color:var(--on-ink-soft); }
.sites span{ color:var(--pending); }

/* ---------- footer ---------- */
.footer{ background:var(--ink-deep); color:var(--on-ink-soft); }
.footer__in{ display:grid; grid-template-columns:minmax(0,2fr) repeat(2,minmax(0,1fr)); gap:36px; padding-block:44px; }
.footer h4{ font-size:.9rem; color:var(--on-ink); margin:0 0 12px; }
.footer ul{ list-style:none; margin:0; padding:0; display:grid; gap:8px; }
.footer a{ text-decoration:none; font-size:.9rem; transition:color .18s var(--ease); }
.footer a:hover{ color:var(--magenta); }
.footer__bottom{ border-top:1px solid var(--on-ink-line); padding-block:18px; display:flex; flex-wrap:wrap; gap:14px; justify-content:space-between; font-size:.78rem; }
.footer__credit{ color:rgba(203,184,232,.68); max-width:64ch; }

/* ---------- reveal ---------- */
html.js .reveal{ opacity:0; transform:translateY(12px); }
html.js .reveal.in{ opacity:1; transform:none; transition:opacity .4s var(--ease), transform .5s var(--ease); }
html.js .unit.reveal.in:nth-child(2){ transition-delay:.05s; }
html.js .unit.reveal.in:nth-child(3){ transition-delay:.1s; }
html.js .unit.reveal.in:nth-child(4){ transition-delay:.15s; }

/* ---------- responsive ---------- */
@media (max-width:1080px){
  .units__grid{ grid-template-columns:repeat(2,minmax(0,1fr)); margin-top:-64px; }
  .about,.close{ grid-template-columns:1fr; }
  .loop{ grid-template-columns:repeat(2,minmax(0,1fr)); }
}
@media (max-width:860px){
  .nav{
    display:flex; position:fixed; inset:76px 0 auto; z-index:var(--z-menu);
    flex-direction:column; align-items:stretch; gap:0; margin-left:0;
    background:var(--ink); border-bottom:1px solid var(--on-ink-line); padding:6px var(--pad) 18px;
  }
  .nav.hidden{ display:none; }
  .nav a{ padding:13px 0; border-bottom:1px solid var(--on-ink-line); font-size:1rem; }
  .menu-btn{
    display:grid; place-items:center; width:44px; height:44px; background:transparent;
    border:1.5px solid rgba(255,255,255,.4); border-radius:3px; color:var(--on-ink); cursor:pointer;
  }
  .header .btn{ display:none; }
  .header__in{ height:76px; }
}
@media (max-width:860px){
  /* vùng chạm tối thiểu 44px trên thiết bị cảm ứng */
  .footer a{ display:inline-block; padding-block:11px; }
  .footer ul{ gap:2px; }
  .link-go{ padding-block:10px; }
  .brand{ padding-block:6px; }
}
@media (max-width:640px){
  :root{ --pad:20px; }
  .hero__bg::after{ background:linear-gradient(180deg, rgba(27,6,55,.72) 0%, rgba(27,6,55,.92) 72%); }
  .hero__in{ padding-top:130px; padding-bottom:88px; }
  .units__grid{ grid-template-columns:1fr; margin-top:-52px; gap:16px; }
  .grid2,.loop{ grid-template-columns:1fr; gap:20px; }
  .footer__in{ grid-template-columns:1fr; gap:26px; }
  .btn{ width:100%; }
  .header .btn,.unit .btn{ width:auto; }
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion:reduce){
  html{ scroll-behavior:auto; }
  *{ animation:none !important; transition-duration:.001ms !important; }
  .reveal{ opacity:1 !important; transform:none !important; }
}