/* Hallmark · macrostructure: Split Studio · theme: brand-native (ink + gold + cream) · v10 */
/* LAD International Holdings
   Bố cục: diptych đổi chiều luân phiên. Hai khoảnh khắc dàn dựng:
   (1) hero neo trục dọc, (2) hệ sinh thái pane dính + sơ đồ năng lực. */

/* ═══════════════ TOKENS ═══════════════ */
:root{
  --ink:#0a0d12;
  --ink-2:#11151c;
  --light:#f4efe7;
  --cream:#efe7db;
  --paper:#faf7f2;
  --gold:#cda96f;
  --gold-2:#e0c48f;
  --muted-light:rgba(244,239,231,.74);
  --muted-dark:#55504a;
  --line-light:rgba(244,239,231,.14);
  --line-dark:rgba(10,13,18,.13);
  /* thang vang dam cho nen sang — dat tuong phan AA tro len */
  --gold-ink:#8e6d3d;      /* nhan phu tren nen sang */
  --gold-ink-2:#7d5f34;    /* chu nhan trong tieu de */
  --gold-ink-3:#6b4d21;    /* nhan nho, chu hoa giãn cách */
  --gold-ink-4:#7d5f31;    /* icon tren o vang nhat */
  --ink-hover:#141922;     /* nen the toi khi hover */
  --ink-soft:#413b34;      /* chu tren o vang nhat */
  --noise:#f4efe7;         /* cham nhieu - dung mau light, tranh trang thuan */

  --container:min(100vw - 80px,1220px);
  --header:84px;

  /* motion */
  --ease-out:cubic-bezier(0.16,1,0.3,1);
  --ease-in:cubic-bezier(0.7,0,0.84,0);
  --ease-io:cubic-bezier(0.65,0,0.35,1);
  --dur-micro:120ms;
  --dur-short:220ms;
  --dur-long:420ms;
}

/* ═══════════════ RESET ═══════════════ */
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;overflow-x:clip}
body{
  margin:0;background:var(--ink);color:var(--light);
  font-family:"Manrope",system-ui,Arial,sans-serif;font-weight:400;
  line-height:1.65;overflow-x:clip;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
body.menu-open{overflow:hidden}
img{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,p{margin:0}
svg{display:block}

/* ═══════════════ BROWSER SURFACES ═══════════════ */
/* Những thứ trình duyệt tự vẽ — không theme thì trang lộ ra là "lắp ghép" */
::selection{background:rgba(205,169,111,.30);color:var(--light)}
.section-light ::selection,.section-cream ::selection{background:rgba(205,169,111,.34);color:var(--ink)}
::-webkit-scrollbar{width:11px;height:11px}
::-webkit-scrollbar-track{background:var(--ink-2)}
::-webkit-scrollbar-thumb{background:rgba(205,169,111,.34);border-radius:99px;border:3px solid var(--ink-2)}
::-webkit-scrollbar-thumb:hover{background:rgba(205,169,111,.55)}
html{scrollbar-color:rgba(205,169,111,.4) var(--ink-2);scrollbar-width:thin}

:focus{outline:none}
:focus-visible{
  outline:2px solid var(--gold);
  outline-offset:3px;
  border-radius:3px;
}
.section-light :focus-visible,.section-cream :focus-visible{outline-color:var(--gold-ink)}

/* Trang thai :active va :disabled — cong 26 hallmark doi du 5 trang thai
   (mac dinh / hover / focus-visible / active / disabled) cho moi phan tu bam duoc. */
a:active,button:active{transform:translateY(1px)}
.header-cta:active,.chip-link:active,.circle-link:active,.contact-circle:active{
  transform:translateY(1px) scale(.985);
}
.language-switch button:active{transform:scale(.94)}
.menu-toggle:active{transform:scale(.94)}
.year-tab:active strong{color:var(--gold-ink)}

button:disabled,button[aria-disabled="true"],
a[aria-disabled="true"]{
  opacity:.55;cursor:not-allowed;pointer-events:none;
}

/* Focus ring phai hien NGAY, khong duoc fade — nguoi dung ban phim can phan hoi tuc thi (cong 15) */
:focus-visible{transition:none}

.skip-link{
  position:fixed;top:10px;left:10px;z-index:1000;
  padding:12px 20px;background:var(--gold);color:var(--ink);
  font-weight:600;font-size:14px;border-radius:4px;
  transform:translateY(-160%);
  transition:transform var(--dur-short) var(--ease-out);
}
.skip-link:focus-visible{transform:translateY(0)}

/* ═══════════════ LOADER ═══════════════
   QUAN TRỌNG: loader tự ẩn bằng CSS animation sau 2.4s dù JS có chết hay không.
   Trước đây chỉ JS mới gỡ được -> Safari Private / chặn cookie = màn đen vĩnh viễn. */
.page-loader{
  position:fixed;inset:0;z-index:999;background:var(--ink);
  display:grid;place-items:center;align-content:center;gap:26px;
  animation:loaderAutoHide 600ms var(--ease-out) 2.4s forwards;
}
.page-loader.hidden{opacity:0;visibility:hidden;transition:opacity .6s var(--ease-out),visibility .6s}
@keyframes loaderAutoHide{to{opacity:0;visibility:hidden}}
.loader-logo{width:min(340px,56vw);filter:drop-shadow(0 0 28px rgba(205,169,111,.16))}
.loader-line{width:min(260px,46vw);height:1px;background:rgba(244,239,231,.09);overflow:hidden}
.loader-line i{display:block;width:45%;height:100%;background:linear-gradient(90deg,transparent,var(--gold),transparent);animation:loaderSweep 1.1s ease-in-out infinite}
@keyframes loaderSweep{0%{transform:translateX(-110%)}100%{transform:translateX(320%)}}

/* ═══════════════ CHROME ═══════════════ */
.noise{position:fixed;inset:0;pointer-events:none;z-index:90;opacity:.04;
  background-image:radial-gradient(circle at 20% 30%,var(--noise) 0 1px,transparent 1.2px),radial-gradient(circle at 70% 80%,var(--noise) 0 1px,transparent 1.2px);
  background-size:6px 6px,7px 7px;mix-blend-mode:soft-light}
.cursor-glow{
  position:fixed;width:420px;height:420px;border-radius:50%;
  background:radial-gradient(circle,rgba(205,169,111,.16),transparent 62%);
  pointer-events:none;z-index:4;transform:translate(-50%,-50%);
  opacity:0;transition:opacity var(--dur-long) var(--ease-out);
  mix-blend-mode:screen;
}
body:hover .cursor-glow{opacity:1}
.scroll-progress{position:fixed;top:0;left:0;width:100%;height:2px;z-index:100;background:rgba(244,239,231,.05)}
.scroll-progress span{display:block;height:100%;width:100%;transform:scaleX(0);transform-origin:left;will-change:transform;background:linear-gradient(90deg,var(--gold-ink),var(--gold),var(--gold-2));box-shadow:0 0 16px rgba(205,169,111,.5)}

/* ═══════════════ HEADER ═══════════════ */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:80;height:var(--header);
  display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:34px;
  padding:0 max(28px,calc((100vw - 1220px)/2));
  border-bottom:1px solid transparent;
  transition:background var(--dur-long) var(--ease-out),border-color var(--dur-long) var(--ease-out);
}
.site-header.scrolled{background:rgba(10,13,18,.86);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-bottom-color:var(--line-light);height:70px}
.brand{display:flex;align-items:center;min-height:44px}
.brand-logo{width:96px;transition:opacity var(--dur-short) var(--ease-out)}
.brand:hover .brand-logo{opacity:.78}

.desktop-nav{display:flex;gap:34px;justify-self:center}
.desktop-nav a{
  position:relative;font-size:12px;letter-spacing:.14em;text-transform:uppercase;
  font-weight:400;color:var(--muted-light);padding:14px 0;
  transition:color var(--dur-short) var(--ease-out);
}
.desktop-nav a::after{
  content:"";position:absolute;left:0;bottom:8px;height:1px;width:100%;background:var(--gold);
  transform:scaleX(0);transform-origin:left;
  transition:transform var(--dur-long) var(--ease-out);
}
.desktop-nav a:hover,.desktop-nav a.active{color:var(--light)}
.desktop-nav a:hover::after,.desktop-nav a.active::after{transform:scaleX(1)}

.header-actions{display:flex;align-items:center;gap:18px;justify-self:end}
.language-switch{display:flex;align-items:center;gap:2px;border:1px solid var(--line-light);border-radius:99px;padding:2px}
.language-switch button{
  min-width:44px;min-height:44px;padding:0 6px;   /* tap target đạt chuẩn 44x44 */
  font-size:11px;letter-spacing:.1em;font-weight:500;color:var(--muted-light);
  border-radius:99px;transition:color var(--dur-short) var(--ease-out),background var(--dur-short) var(--ease-out);
}
.language-switch button:hover{color:var(--light)}
.language-switch button.active{color:var(--ink);background:var(--gold)}
.language-switch>span{width:1px;height:13px;background:var(--line-light)}

.header-cta{
  display:inline-flex;align-items:center;gap:9px;min-height:44px;padding:0 20px;
  border:1px solid var(--line-light);border-radius:99px;
  font-size:11px;letter-spacing:.13em;text-transform:uppercase;font-weight:500;
  transition:background var(--dur-short) var(--ease-out),color var(--dur-short) var(--ease-out),border-color var(--dur-short) var(--ease-out);
}
.header-cta:hover{background:var(--gold);color:var(--ink);border-color:var(--gold)}
.header-cta i{width:15px;height:15px}

.menu-toggle{display:none;width:44px;height:44px;position:relative;border:1px solid var(--line-light);border-radius:50%}
.menu-toggle span{position:absolute;left:13px;width:18px;height:1px;background:var(--light);transition:transform var(--dur-short) var(--ease-out),opacity var(--dur-micro)}
.menu-toggle span:nth-child(1){top:19px}
.menu-toggle span:nth-child(2){top:24px}
.menu-toggle.open span:nth-child(1){transform:translateY(2.5px) rotate(45deg)}
.menu-toggle.open span:nth-child(2){transform:translateY(-2.5px) rotate(-45deg)}

/* ═══════════════ MOBILE MENU ═══════════════ */
.mobile-menu{
  position:fixed;inset:0;z-index:70;background:var(--ink);
  transform:translateY(-100%);transition:transform var(--dur-long) var(--ease-out);
  padding-top:var(--header);visibility:hidden;
}
.mobile-menu.open{transform:translateY(0);visibility:visible}
.mobile-menu-inner{display:flex;flex-direction:column;justify-content:space-between;height:100%;padding:40px 24px 40px}
.mobile-menu nav{display:flex;flex-direction:column;gap:4px}
.mobile-menu nav a{
  display:flex;align-items:center;min-height:56px;
  border-bottom:1px solid var(--line-light);
  font-family:"Be Vietnam Pro",sans-serif;font-size:26px;font-weight:600;letter-spacing:-.01em;
  transition:color var(--dur-short) var(--ease-out),transform var(--dur-short) var(--ease-out);
}
.mobile-menu nav a:hover{color:var(--gold);transform:translateX(8px)}
.mobile-bottom{display:flex;flex-direction:column;gap:20px;color:var(--muted-light);font-size:14px}
.mobile-bottom a{min-height:44px;display:flex;align-items:center}

/* ═══════════════ LAYOUT PRIMITIVES ═══════════════ */
.split,.purpose,.values,.milestones,.capability,.contact,.stack{padding:150px 0}
.split-inner,.purpose-inner,.values-inner,.milestones-inner,.capability-inner,.contact-inner,.stack-inner{
  width:var(--container);margin-inline:auto;
}
.section-light{background:var(--paper);color:var(--ink)}
.section-cream{background:var(--cream);color:var(--ink)}
.section-dark{background:var(--ink);color:var(--light)}

.display-heading{
  font-family:"Be Vietnam Pro",sans-serif;font-weight:700;
  font-size:clamp(28px,2.9vw,44px);line-height:1.22;letter-spacing:-.02em;
  text-wrap:balance;
  overflow-wrap:anywhere;
  min-width:0;
}
/* Cum nhan mach trong tieu de — phuong an F.
   KHONG dung chu nghieng: hallmark cong 38a xep tieu de in nghieng vao dau hieu AI hang dau,
   va dau thanh tieng Viet tren chu nghieng cung kho doc hon. Nhan manh bang khoi + neo doc. */
.display-heading em{
  display:block;font-style:normal;font-weight:600;color:var(--gold-ink-2);
  border-left:2px solid var(--gold-ink);padding-left:18px;margin-top:12px;
}
.display-heading.light em{color:var(--gold-2);border-left-color:var(--gold)}
.contact-heading em{
  display:block;font-style:normal;font-weight:700;color:var(--gold-2);
  border-left:2px solid var(--gold);padding-left:20px;margin-top:14px;text-transform:none;
}

/* Cột hẹp (Split Studio ~560px, Feature Stack ~487px) cần thang chữ nhỏ hơn
   bản tràn ngang — nếu không tiếng Việt chỉ vừa ~9 ký tự/dòng và sinh dòng mồ côi. */
.split-text .display-heading,
.stack-pane .display-heading{font-size:clamp(26px,2.3vw,35px);line-height:1.26}

.lead{font-size:17px;line-height:1.75;color:var(--muted-dark)}
.section-dark .lead{color:var(--muted-light)}
.split-text p{font-size:15.5px;line-height:1.8;color:var(--muted-dark)}
.section-dark .split-text p{color:var(--muted-light)}

.chip-link{
  display:inline-flex;align-items:center;gap:10px;min-height:44px;padding:0 22px;
  border:1px solid var(--line-dark);border-radius:99px;
  font-size:12px;letter-spacing:.11em;text-transform:uppercase;font-weight:500;
  transition:background var(--dur-short) var(--ease-out),color var(--dur-short) var(--ease-out),border-color var(--dur-short) var(--ease-out),gap var(--dur-short) var(--ease-out);
}
.chip-link:hover{background:var(--ink);color:var(--light);border-color:var(--ink);gap:14px}
.chip-link i{width:15px;height:15px}

/* ═══════════════ HERO · HP1 Vertical-rail ═══════════════ */
/* Xep lop bang GRID 1x1 thay vi absolute. Truoc day ray/anh/chu/marquee moi lop mot he
   toa do rieng nen chu troi so voi anh khi doi viewport — day la goc cua "bo cuc chu kem". */
.hero{
  position:relative;display:grid;grid-template-columns:100%;
  min-height:max(100svh,640px);          /* min-height tinh CA padding (border-box) */
  align-content:center;
  overflow:hidden;isolation:isolate;
  padding:calc(var(--header) + 20px) 0 140px;   /* day/dinh = 1.35, keo hero vao nhip trang */
}
.hero>*{grid-area:1/1}                    /* moi lop chung MOT o canh chinh */
.hero-media{align-self:stretch;justify-self:stretch}
.hero-media{position:absolute;inset:0;z-index:0;overflow:hidden}
.hero-media img{width:100%;height:100%;object-fit:cover;object-position:center right;
  filter:saturate(.8) contrast(1.05) brightness(.62);transform:scale(1.06);
  animation:kenBurns 26s ease-in-out infinite alternate}
@keyframes kenBurns{
  from{transform:scale(1.06) translate3d(0,0,0)}
  to{transform:scale(1.14) translate3d(-1.6%,-1.2%,0)}
}
.hero-media-overlay{position:absolute;inset:0;
  background:linear-gradient(90deg,rgba(10,13,18,.97) 0%,rgba(10,13,18,.90) 32%,rgba(10,13,18,.62) 60%,rgba(10,13,18,.34) 100%),
             linear-gradient(180deg,rgba(10,13,18,.10),rgba(10,13,18,.60))}
.hero-light{position:absolute;z-index:1;left:-14%;top:-24%;width:78%;height:150%;
  background:radial-gradient(ellipse at center,rgba(205,169,111,.15),transparent 62%)}
.hero-orbit{position:absolute;z-index:1;border:1px solid var(--line-light);border-radius:50%;pointer-events:none}
.orbit-one{width:min(760px,88vw);aspect-ratio:1;left:6%;top:50%;transform:translateY(-50%);animation:spin 74s linear infinite}
.orbit-two{width:min(470px,58vw);aspect-ratio:1;left:2%;top:56%;transform:translateY(-50%);border-style:dashed;border-color:rgba(205,169,111,.20);animation:spinReverse 56s linear infinite}
@keyframes spin{to{transform:translateY(-50%) rotate(360deg)}}
@keyframes spinReverse{to{transform:translateY(-50%) rotate(-360deg)}}

.hero-inner{
  position:relative;z-index:3;width:var(--container);margin-inline:auto;
  display:grid;grid-template-columns:auto 1fr;gap:36px;align-items:start;
}
/* Thanh ray dọc — neo cấu trúc cho khối chữ */
.hero-rail{display:flex;flex-direction:column;align-items:center;gap:16px;padding-top:14px;align-self:stretch}
.rail-line{flex:1;width:1px;background:linear-gradient(180deg,transparent,var(--line-light) 22%,var(--line-light) 78%,transparent)}
.rail-line:first-child{flex:0 0 64px;background:linear-gradient(180deg,transparent,var(--gold))}
.rail-mark{font-size:10px;letter-spacing:.28em;color:var(--gold);writing-mode:vertical-rl;text-orientation:mixed}

.hero-title{
  font-family:"Be Vietnam Pro",sans-serif;font-weight:700;
  font-size:clamp(46px,6.2vw,92px);line-height:1.14;letter-spacing:-.018em;
  text-transform:uppercase;max-width:14ch;margin:0 0 40px;
}
/* Mask theo TU — thong so lay tu Hartmann Capital + Gruppo Saida + Zypsy.
   DAY DAY HON DINH: dau nang tieng Viet nam duoi baseline. Truoc day nguoc (.14 dinh / .12 day). */
.title-line{display:block;overflow:hidden;padding:.20em .28em .26em;margin:-.20em -.28em -.26em}
.title-line>span{display:block}
/* Chan "TOAN" va "CAU" roi hai dong khi doi ngon ngu / breakpoint */
.title-line .w{white-space:nowrap}
.title-line .w{display:inline-block;font-style:inherit;will-change:transform}
/* Dong 2 hero — phuong an C: cung font display, chi doi mau. Bo serif nghieng (cong 38a). */
.title-serif{color:var(--gold-2);letter-spacing:-.022em;padding-left:clamp(30px,5vw,88px)}
.title-indent{padding-left:clamp(52px,9vw,150px)}

.hero-lower{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:44px;align-items:end}
.hero-description{max-width:56ch;color:rgba(244,239,231,.76);font-size:clamp(15px,1.1vw,17px);line-height:1.82}
.hero-description strong{font-weight:500;color:var(--light)}

.circle-link,.contact-circle{
  display:grid;place-items:center;gap:6px;width:132px;height:132px;flex:0 0 auto;
  border:1px solid var(--line-light);border-radius:50%;text-align:center;
  font-size:11px;letter-spacing:.13em;text-transform:uppercase;font-weight:500;
  transition:background var(--dur-long) var(--ease-out),color var(--dur-long) var(--ease-out),border-color var(--dur-long) var(--ease-out);
}
.circle-link:hover,.contact-circle:hover{background:var(--gold);color:var(--ink);border-color:var(--gold)}
.circle-link i,.contact-circle i{width:17px;height:17px}

.hero-marquee{position:absolute;bottom:0;left:0;right:0;z-index:3;
  border-top:1px solid var(--line-light);border-bottom:1px solid var(--line-light);
  overflow:hidden;padding:15px 0;background:rgba(10,13,18,.55);backdrop-filter:blur(6px)}
.marquee-track{display:flex;align-items:center;gap:30px;width:max-content;animation:marquee 44s linear infinite}
.marquee-track span{font-size:11px;letter-spacing:.24em;color:var(--muted-light);white-space:nowrap;font-weight:400}
.marquee-track i{width:3px;height:3px;border-radius:50%;background:var(--gold);flex:0 0 auto}
@keyframes marquee{to{transform:translateX(-50%)}}

/* ═══════════════ SPLIT STUDIO ═══════════════ */
.split-inner{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:clamp(48px,7vw,110px);align-items:center}
.split-reverse .split-inner{direction:rtl}
.split-reverse .split-inner>*{direction:ltr}
.split-text{display:flex;flex-direction:column;align-items:flex-start;gap:26px;max-width:60ch}

/* Cột số liệu — kích thước lệch nhau, không phải card đồng dạng */
.figure-stack{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.figure{
  display:flex;flex-direction:column;justify-content:flex-end;gap:10px;
  padding:28px 26px;min-height:180px;border:1px solid var(--line-dark);border-radius:16px;
  background:rgba(255,255,255,.42);
  transition:transform var(--dur-long) var(--ease-out),border-color var(--dur-long) var(--ease-out),background var(--dur-long) var(--ease-out);
}
.figure:hover{transform:translateY(-4px);border-color:rgba(205,169,111,.5);background:rgba(255,255,255,.7)}
.figure strong{font-family:"Be Vietnam Pro",sans-serif;font-size:clamp(42px,4vw,60px);font-weight:700;letter-spacing:-.03em;line-height:1;color:var(--ink)}
.figure strong sup{font-size:.42em;vertical-align:super;color:var(--gold);margin-left:2px}
.figure p{font-size:13.5px;line-height:1.55;color:var(--muted-dark)}
.figure-lg{grid-column:span 2;min-height:150px}
.figure-lg strong{font-size:clamp(56px,5.4vw,84px)}
.figure-mark strong{font-family:"Lora",Georgia,serif;color:var(--gold-ink);font-size:clamp(50px,4.6vw,72px)}
.figure-stack-4{grid-template-columns:1fr 1fr}
.figure-stack-4 .figure{min-height:158px}

.panel-pair{display:grid;gap:16px}
.panel{padding:32px 30px;border:1px solid var(--line-dark);border-radius:16px;background:rgba(255,255,255,.44)}
.panel>span{display:block;font-size:12px;letter-spacing:.13em;text-transform:uppercase;color:var(--gold-ink-3);margin-bottom:18px;font-weight:600}
.panel li{position:relative;padding-left:20px;font-size:14.5px;line-height:1.9;color:var(--muted-dark)}
.panel li::before{content:"";position:absolute;left:0;top:13px;width:6px;height:1px;background:var(--gold)}
.panel-dark{background:var(--ink);border-color:transparent;color:var(--light)}
.panel-dark>span{color:var(--gold)}
.panel-dark li{color:var(--muted-light)}

/* ═══════════════ PURPOSE (diptych) ═══════════════ */
.purpose-inner{display:grid;grid-template-columns:1fr 1fr;gap:clamp(20px,3vw,40px)}
.purpose-half{display:flex;flex-direction:column;gap:18px;padding:44px 42px 38px;border-radius:20px;background:rgba(255,255,255,.40);border:1px solid var(--line-dark)}
.purpose-half.mission{background:var(--ink);color:var(--light);border-color:transparent}
.purpose-icon{width:46px;height:46px;display:grid;place-items:center;border:1px solid var(--line-dark);border-radius:50%;color:var(--gold-ink)}
.mission .purpose-icon{border-color:var(--line-light);color:var(--gold)}
.purpose-icon i{width:20px;height:20px}
.purpose-tag{font-size:12px;letter-spacing:.13em;text-transform:uppercase;color:var(--gold-ink-3);font-weight:600}
.mission .purpose-tag{color:var(--gold)}
.purpose-half h3{font-family:"Be Vietnam Pro",sans-serif;font-size:clamp(21px,1.8vw,27px);font-weight:700;line-height:1.32;letter-spacing:-.02em;max-width:19ch;text-wrap:balance}
.purpose-half p{font-size:15px;line-height:1.75;color:var(--muted-dark);max-width:38ch}
.mission p{color:var(--muted-light)}

/* ═══════════════ FEATURE STACK (hệ sinh thái) ═══════════════ */
.stack-inner{display:grid;grid-template-columns:minmax(0,.86fr) minmax(0,1.14fr);gap:clamp(40px,6vw,96px);align-items:start}
.stack-pane{position:sticky;top:calc(var(--header) + 60px);display:flex;flex-direction:column;gap:38px}
.stack-counter{display:flex;align-items:center;gap:14px;font-family:"Be Vietnam Pro",sans-serif}
.stack-counter b{font-size:52px;font-weight:700;color:var(--gold);line-height:1;letter-spacing:-.03em;font-variant-numeric:tabular-nums}
.stack-counter i{width:44px;height:1px;background:var(--line-light)}
.stack-counter span{font-size:15px;color:var(--muted-light);font-variant-numeric:tabular-nums}

.stack-list{display:flex;flex-direction:column;gap:20px}
.stack-item{
  display:grid;gap:0;border:1px solid var(--line-light);border-radius:20px;overflow:hidden;
  background:var(--ink-2);
  transition:border-color var(--dur-long) var(--ease-out),transform var(--dur-long) var(--ease-out);
}
.stack-item.is-active{border-color:rgba(205,169,111,.42)}
.stack-thumb{margin:0;overflow:hidden;aspect-ratio:16/9}
.stack-thumb img{width:100%;height:100%;object-fit:cover;
  filter:grayscale(1) brightness(.72) contrast(1.06);
  transform:scale(1.04);
  transition:transform 900ms var(--ease-out),filter 900ms var(--ease-out)}
.stack-item.is-active .stack-thumb img,.stack-item:hover .stack-thumb img{filter:grayscale(.35) brightness(.88) contrast(1.02);transform:scale(1)}
.stack-body{padding:30px 32px 34px;display:flex;flex-direction:column;gap:12px}
.stack-kind{font-size:11px;letter-spacing:.17em;text-transform:uppercase;color:var(--gold);font-weight:500}
.stack-body h3{font-family:"Be Vietnam Pro",sans-serif;font-size:clamp(21px,1.9vw,28px);font-weight:700;line-height:1.32;letter-spacing:-.02em}
.stack-body p{font-size:15px;line-height:1.78;color:var(--muted-light);max-width:52ch}

/* ═══════════════ VALUES (lưới không đều) ═══════════════ */
.values-inner{display:flex;flex-direction:column;gap:60px}
.values-list{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.value-item{
  display:flex;flex-direction:column;gap:12px;padding:32px 30px;min-height:210px;
  border:1px solid var(--line-dark);border-radius:18px;background:rgba(255,255,255,.40);
  transition:transform var(--dur-long) var(--ease-out),background var(--dur-long) var(--ease-out),border-color var(--dur-long) var(--ease-out);
}
.value-item:hover{transform:translateY(-5px);background:rgba(255,255,255,.72);border-color:rgba(205,169,111,.45)}
.value-item i{width:22px;height:22px;color:var(--gold-ink)}
.value-item h3{font-family:"Be Vietnam Pro",sans-serif;font-size:20px;font-weight:700;letter-spacing:-.015em;margin-top:auto}
.value-item p{font-size:14.5px;line-height:1.7;color:var(--muted-dark)}
.value-item.is-wide{grid-column:span 2;background:var(--ink);color:var(--light);border-color:transparent}
.value-item.is-wide i{color:var(--gold)}
.value-item.is-wide h3{font-size:26px}
.value-item.is-wide p{color:var(--muted-light);max-width:46ch}
.value-item.is-wide:hover{background:var(--ink-hover)}
.value-item.is-tall{background:rgba(205,169,111,.15);border-color:rgba(205,169,111,.40)}
.value-item.is-tall p{color:var(--ink-soft)}
.value-item.is-tall i{color:var(--gold-ink-4)}

/* ═══════════════ MILESTONES ═══════════════ */
.milestones-inner{display:flex;flex-direction:column;gap:56px}
.milestones-head{display:grid;grid-template-columns:1.25fr 1fr;gap:56px;align-items:end}
.milestones-intro{font-size:15.5px;line-height:1.82;color:var(--muted-dark);max-width:46ch}
.timeline{position:relative;display:flex;flex-direction:column}
.timeline-line{position:absolute;left:0;right:0;top:0;height:1px;background:var(--line-dark)}
.timeline-line span{display:block;height:100%;width:100%;transform:scaleX(.25);transform-origin:left;background:var(--gold);transition:transform var(--dur-long) var(--ease-out)}
.timeline-year{border-bottom:1px solid var(--line-dark)}
.year-tab{
  display:grid;grid-template-columns:170px 1fr auto;align-items:center;gap:22px;
  width:100%;min-height:88px;padding:22px 0;text-align:left;
  transition:color var(--dur-short) var(--ease-out)}
.year-tab strong{font-family:"Be Vietnam Pro",sans-serif;font-size:clamp(30px,3vw,44px);font-weight:700;letter-spacing:-.03em;color:var(--muted-dark);transition:color var(--dur-short) var(--ease-out);font-variant-numeric:tabular-nums}
.year-tab>span{font-family:"Be Vietnam Pro",sans-serif;font-size:clamp(17px,1.6vw,22px);font-weight:600;letter-spacing:-.015em}
.year-tab i{width:20px;height:20px;color:var(--muted-dark);transition:transform var(--dur-long) var(--ease-out),color var(--dur-short) var(--ease-out)}
.timeline-year:hover .year-tab strong,.timeline-year.active .year-tab strong{color:var(--ink)}
.timeline-year.active .year-tab i{transform:rotate(135deg);color:var(--gold)}
.year-content{display:grid;grid-template-rows:0fr;transition:grid-template-rows var(--dur-long) var(--ease-io)}
.timeline-year.active .year-content{grid-template-rows:1fr}
.year-content>ul{overflow:hidden;padding-left:192px}
.timeline-year.active .year-content>ul{padding-bottom:26px}
.year-content li{position:relative;padding-left:20px;font-size:15px;line-height:1.85;color:var(--muted-dark);max-width:70ch}
.year-content li::before{content:"";position:absolute;left:0;top:14px;width:7px;height:1px;background:var(--gold)}

/* ═══════════════ CAPABILITY · sơ đồ hệ thống ═══════════════ */
.capability{position:relative;overflow:hidden}
.capability-glow{position:absolute;top:-20%;right:-14%;width:56%;height:120%;
  background:radial-gradient(circle,rgba(205,169,111,.13),transparent 62%);pointer-events:none}
.capability-inner{position:relative;display:flex;flex-direction:column;gap:70px}
.system{display:grid;grid-template-columns:minmax(0,.95fr) minmax(0,1.05fr);gap:clamp(44px,6vw,92px);align-items:center}
.system-diagram{position:relative;max-width:460px;margin-inline:auto;width:100%}
.system-diagram svg{width:100%;height:auto;overflow:visible}
.sys-ring{fill:none;stroke:var(--line-light);stroke-width:1}
.sys-ring-1{stroke:rgba(205,169,111,.42)}
.sys-ring-2{stroke-dasharray:3 8;animation:sysSpin 60s linear infinite;transform-origin:210px 210px}
.sys-ring-3{stroke-dasharray:2 14;animation:sysSpinRev 90s linear infinite;transform-origin:210px 210px}
@keyframes sysSpin{to{transform:rotate(360deg)}}
@keyframes sysSpinRev{to{transform:rotate(-360deg)}}
.sys-spokes line{stroke:var(--line-light);stroke-width:1;stroke-dasharray:2 6}
.sys-nodes circle{fill:var(--gold);opacity:.85}
.sys-nodes circle:nth-child(1){animation:nodePulse 4s var(--ease-io) infinite}
.sys-nodes circle:nth-child(2){animation:nodePulse 4s var(--ease-io) 1s infinite}
.sys-nodes circle:nth-child(3){animation:nodePulse 4s var(--ease-io) 2s infinite}
.sys-nodes circle:nth-child(4){animation:nodePulse 4s var(--ease-io) 3s infinite}
@keyframes nodePulse{0%,100%{opacity:.5;r:5}50%{opacity:1;r:8}}
.sys-labels text{fill:var(--muted-light);font-family:"Manrope",sans-serif;font-size:10px;letter-spacing:.2em;font-weight:400}
.sys-core{fill:var(--light);font-family:"Be Vietnam Pro",sans-serif;font-size:44px;font-weight:700;letter-spacing:-.02em}
.sys-core-sub{fill:var(--gold);font-family:"Manrope",sans-serif;font-size:9px;letter-spacing:.26em;font-weight:400}

.system-points{display:flex;flex-direction:column;counter-reset:pt}
.system-points li{
  position:relative;padding:26px 0 26px 60px;border-bottom:1px solid var(--line-light);
  counter-increment:pt;
}
.system-points li:first-child{border-top:1px solid var(--line-light)}
.system-points li::before{
  content:counter(pt,decimal-leading-zero);position:absolute;left:0;top:28px;
  font-family:"Be Vietnam Pro",sans-serif;font-size:12px;font-weight:600;color:var(--gold);
  letter-spacing:.08em;font-variant-numeric:tabular-nums;
}
.system-points h3{font-family:"Be Vietnam Pro",sans-serif;font-size:19px;font-weight:700;letter-spacing:-.015em;margin-bottom:8px}
.system-points p{font-size:14.5px;line-height:1.78;color:var(--muted-light);max-width:52ch}

/* ═══════════════ ORG MARQUEE ═══════════════ */
.org-marquee{margin-top:80px;overflow:hidden;border-top:1px solid var(--line-dark);border-bottom:1px solid var(--line-dark);padding:17px 0}
.org-track{display:flex;gap:44px;width:max-content;animation:marquee 52s linear infinite}
.org-track span{font-size:12px;letter-spacing:.13em;color:var(--muted-dark);white-space:nowrap;text-transform:uppercase}

/* ═══════════════ CONTACT ═══════════════ */
.contact{position:relative;overflow:hidden;padding-bottom:56px}
.contact-art{position:absolute;right:-140px;top:70px;pointer-events:none;opacity:.5}
.contact-ring{width:540px;height:540px;border:1px solid var(--line-light);border-radius:50%}
.contact-word{position:absolute;inset:0;display:grid;place-items:center;font-family:"Lora",Georgia,serif;font-size:160px;font-style:italic;color:rgba(205,169,111,.09)}
.contact-inner{position:relative}
.contact-top{display:flex;justify-content:space-between;align-items:flex-end;gap:44px}
.contact-heading{font-family:"Be Vietnam Pro",sans-serif;font-size:clamp(34px,3.8vw,54px);font-weight:700;line-height:1.16;letter-spacing:-.025em;text-transform:uppercase}

.contact-divider{height:1px;background:var(--line-light);margin:76px 0 42px}
.contact-details{display:grid;grid-template-columns:repeat(4,1fr);gap:30px}
.contact-block small{display:block;font-size:10px;letter-spacing:.16em;text-transform:uppercase;color:var(--gold);margin-bottom:16px}
.contact-block p,.contact-block>a{margin:0;color:var(--muted-light);display:block;line-height:1.85;font-size:15px}
.contact-block>a{min-height:44px;display:flex;align-items:center;transition:color var(--dur-short) var(--ease-out)}
.contact-block>a:hover{color:var(--gold)}
.social-links a{display:inline-flex;align-items:center;gap:8px;min-height:44px;color:var(--muted-light);transition:color var(--dur-short) var(--ease-out),gap var(--dur-short) var(--ease-out)}
.social-links a:hover{color:var(--gold);gap:12px}
.social-links i{width:14px;height:14px}

/* ═══════════════ FOOTER ═══════════════ */
.footer{background:var(--ink);border-top:1px solid var(--line-light);padding:30px 0 38px}
.footer-inner{width:var(--container);margin-inline:auto;display:flex;align-items:center;justify-content:space-between;gap:24px;color:var(--muted-light);font-size:12.5px}
.footer-logo{width:150px}
.back-top{display:inline-flex;align-items:center;gap:9px;min-height:44px;text-transform:uppercase;letter-spacing:.11em;font-size:11px;transition:color var(--dur-short) var(--ease-out),gap var(--dur-short) var(--ease-out)}
.back-top:hover{color:var(--gold);gap:13px}
.back-top i{width:14px;height:14px}

/* ═══════════════ REVEAL · biến thể theo vai trò section ═══════════════ */
/* Không dùng một kiểu duy nhất cho mọi thứ — mỗi loại có chuyển động riêng */
[data-reveal]{opacity:0;will-change:opacity,transform}
[data-reveal="rise"]{transform:translateY(30px)}
[data-reveal="mask"]{clip-path:inset(0 0 100% 0);transform:none}
[data-reveal="slide-l"]{transform:translateX(-38px)}
[data-reveal="slide-r"]{transform:translateX(38px)}
[data-reveal="soft"]{transform:scale(.965);filter:blur(7px)}
[data-reveal].is-in{
  opacity:1;transform:none;filter:none;clip-path:inset(0 0 0 0);
  transition:opacity 760ms var(--ease-out),transform 860ms var(--ease-out),
             clip-path 900ms var(--ease-out),filter 700ms var(--ease-out);
  transition-delay:calc(var(--d,0) * 85ms);
}

/* ═══════════════ RESPONSIVE ═══════════════ */
@media (max-width:1180px){
  :root{--container:min(100vw - 56px,1220px)}
  .desktop-nav,.header-cta{display:none}
  .menu-toggle{display:block}
  .split-inner,.system,.stack-inner,.milestones-head{grid-template-columns:1fr;gap:48px}
  .split-reverse .split-inner{direction:ltr}
  .split-reverse .split-proof{order:2}
  .stack-pane{position:static}
  .values-list{grid-template-columns:repeat(2,1fr)}
  .value-item.is-wide{grid-column:span 2}
  .purpose-inner{grid-template-columns:1fr}
  .contact-details{grid-template-columns:repeat(2,1fr)}
  .milestones-head{align-items:start}
}

@media (max-width:760px){
  :root{--container:min(100vw - 32px,1220px);--header:70px}
  .split,.purpose,.values,.milestones,.capability,.contact,.stack{padding:84px 0}
  .site-header{padding:0 16px}
  .brand-logo{width:80px}
  .cursor-glow{display:none}

  .hero{padding:calc(var(--header) + 56px) 0 96px;min-height:auto}
  .hero-inner{grid-template-columns:1fr;gap:0}
  .hero-rail{display:none}
  .hero-title{font-size:clamp(38px,10.5vw,56px);line-height:1.16;max-width:none;margin-bottom:30px}
  /* Bo mask duoi 991px: chu nho thi sai so 1px cua mask la mat dau */
  .title-line{overflow:visible;padding:0;margin:0}
  .title-serif,.title-indent{padding-left:0}
  .hero-lower{grid-template-columns:1fr;gap:34px;align-items:start}
  .circle-link{width:112px;height:112px}
  .hero-media img{object-position:64% center;filter:saturate(.78) contrast(1.04) brightness(.5);animation-duration:34s}

  .display-heading{font-size:clamp(26px,7vw,34px);line-height:1.26}
  .display-heading em{padding-left:13px;margin-top:9px}
  .contact-heading em{padding-left:15px;margin-top:10px}
  /* Cột hẹp trên mobile: nhỏ thêm để câu tiếng Việt không rớt chữ cuối xuống dòng riêng */
  .split-text .display-heading,
  .stack-pane .display-heading{font-size:clamp(22px,6vw,26px);line-height:1.3}
  .figure-stack,.figure-stack-4{grid-template-columns:1fr 1fr;gap:10px}
  .figure{padding:20px 18px;min-height:142px}
  .figure-lg{grid-column:span 2;min-height:126px}
  .figure p{font-size:12.5px}
  .purpose-half{padding:28px 24px 26px}
  .values-list{grid-template-columns:1fr}
  .value-item,.value-item.is-wide{grid-column:span 1;min-height:0;padding:26px 24px}
  .year-tab{grid-template-columns:88px 1fr auto;gap:14px;min-height:72px}
  .year-content>ul{padding-left:0}
  .system-diagram{max-width:320px}
  .system-points li{padding:22px 0 22px 46px}
  .contact-details{grid-template-columns:1fr;gap:26px}
  .contact-top{flex-direction:column;align-items:flex-start;gap:32px}
  .contact-circle{width:118px;height:118px}
  .contact-art{right:-230px;top:110px}
  .contact-word{font-size:110px}
  .contact-divider{margin:52px 0 32px}
  .footer-inner{flex-direction:column;align-items:flex-start;gap:18px}
  .footer-logo{width:128px}
  .org-marquee{margin-top:52px}
}

/* ═══════════════ REDUCED MOTION ═══════════════ */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;animation-iteration-count:1!important;
    transition-duration:.001ms!important;scroll-behavior:auto!important;
  }
  /* Vẫn phải hiện nội dung — không được để reveal kẹt ở opacity 0 */
  [data-reveal]{opacity:1!important;transform:none!important;filter:none!important;clip-path:none!important}
  .page-loader{animation:none;opacity:0;visibility:hidden}
  .hero-media img{animation:none;transform:scale(1.06)}
}