/* ==========================================================================
   City Group - landing page va ba trang phap ly
   Mot ho chu: Archivo (ban hep wdth 78 cho tieu de, ban thuong cho noi dung).
   Mau: nen xam am, muc gan den, xanh bien ten duong cho hanh dong, the ho so va
   mot mang mau lon; vang chi o logo va trang thai hover/focus.
   Quy tac: khong gradient, khong bong do, khong nhan nho viet hoa tren tieu de,
   khong danh so 01/02/03, nut goc vuong. Xem DESIGN.md.
   ========================================================================== */

:root {
  --ground: #F3F2EE;
  --tone: #E8E6E0;
  --paper: #FFFFFF;
  --ink: #14181D;
  --ink-2: #353B42;
  --muted: #565C63;
  --rule: #CFCBC2;
  --plate: #1B4A8F;
  --plate-dk: #143A72;
  --on-plate: #FFFFFF;
  --on-plate-2: #D5DEEC;
  --plot: #F2C14E;
  --foot: #14181D;
  --on-foot: #C3C8CE;

  --f: "Archivo", "Archivo Fallback", Arial, "Helvetica Neue", sans-serif;
  --narrow: 78%;

  --s-small: 0.875rem;
  --s-body: clamp(1.0625rem, 1rem + 0.25vw, 1.1875rem);
  --s-lead: clamp(1.25rem, 1.1rem + 0.6vw, 1.5rem);
  --s-head: clamp(2.125rem, 1.35rem + 3.1vw, 3.75rem);
  --s-display: clamp(2.6rem, 1rem + 6.4vw, 7.25rem);

  --wrap: 1240px;
  --gut: clamp(20px, 4vw, 40px);
  --sec: clamp(72px, 8.5vw, 128px);

  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --t-press: 140ms;
  --t-hover: 180ms;
  --t-reveal: 800ms;
}

/* ---------- Nen tang ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 84px; }
body {
  margin: 0;
  font-family: var(--f);
  font-size: var(--s-body);
  line-height: 1.55;
  color: var(--ink);
  background: var(--ground);
  -webkit-font-smoothing: antialiased;
  font-kerning: normal;
}
img, svg { max-width: 100%; height: auto; display: block; }
a { color: var(--plate); text-decoration-thickness: 1px; text-underline-offset: 0.2em; transition: color var(--t-hover) ease; }
a:hover { color: var(--plate-dk); }
h1, h2, h3 {
  font-family: var(--f); font-stretch: var(--narrow); font-weight: 620;
  color: var(--ink); margin: 0; text-wrap: balance;
}
p { margin: 0; text-wrap: pretty; }
p + p { margin-top: 0.9em; }
ul { margin: 0; padding: 0; list-style: none; }
figure { margin: 0; }
:focus-visible { outline: 3px solid var(--plot); outline-offset: 3px; }
::selection { background: var(--plot); color: var(--ink); }

.wrap { max-width: var(--wrap); margin-inline: auto; padding-inline: var(--gut); }
.skip {
  position: absolute; left: -9999px; top: 0; z-index: 999;
  background: var(--ink); color: #fff; padding: 12px 20px;
}
.skip:focus { left: 0; color: #fff; }

/* ---------- Nut va lien ket ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  font: 600 1rem/1.2 var(--f); letter-spacing: 0.005em;
  padding: 15px 26px; border-radius: 2px; border: 0;
  background: var(--plate); color: var(--on-plate); text-decoration: none;
  cursor: pointer; white-space: nowrap;
  transition: background-color var(--t-hover) ease, transform var(--t-press) var(--ease-out);
}
.btn:hover { background: var(--plate-dk); color: var(--on-plate); }
.btn:active { transform: scale(0.97); }
.btn--sm { padding: 11px 18px; font-size: 0.9375rem; }
.btn--lg { padding: 19px 32px; font-size: 1.0625rem; }
.link {
  font-weight: 600; color: var(--ink); text-decoration: underline;
  text-decoration-color: var(--rule); text-decoration-thickness: 2px; text-underline-offset: 0.3em;
  transition: text-decoration-color var(--t-hover) ease, color var(--t-hover) ease;
}
.link:hover { color: var(--ink); text-decoration-color: var(--plate); }

/* ---------- Thanh tren ---------- */
.hdr {
  position: sticky; top: 0; z-index: 100;
  background: var(--ground);
  transition: background-color 300ms ease;
}
.hdr.is-scrolled { background: var(--paper); }
.hdr__in { display: flex; align-items: center; gap: 32px; min-height: 72px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; margin-right: auto; color: var(--ink); }
.brand:hover { color: var(--ink); }
.brand__mark { width: 36px; height: 36px; flex: 0 0 36px; }
.brand__name {
  font-stretch: 80%; font-weight: 650; font-size: 1.25rem; letter-spacing: 0.045em;
  text-transform: uppercase; line-height: 1;
}
.nav { display: flex; gap: 28px; }
.nav a {
  font-size: 0.9375rem; font-weight: 500; color: var(--ink); text-decoration: none;
  padding: 6px 0; background: linear-gradient(var(--plate), var(--plate)) 0 100% / 0 2px no-repeat;
  transition: background-size 300ms var(--ease-out), color var(--t-hover) ease;
}
.nav a:hover, .nav a[aria-current] { background-size: 100% 2px; color: var(--ink); }
.nav-toggle { display: none; }

/* ---------- Dau trang ---------- */
.hero__in {
  display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  gap: 48px clamp(40px, 6vw, 96px); align-items: center;
  padding-block: clamp(48px, 7vw, 104px) clamp(64px, 8vw, 112px);
}
/* Co chu tieu de theo be rong cot: dong dai nhat ~7.9em, nen 12.2cqi luon vua 2 dong */
.hero__text { container-type: inline-size; }
.hero h1 {
  font-size: min(var(--s-display), 12.2cqi); line-height: 1.02; letter-spacing: -0.02em;
  margin-left: -0.04em;
}
.hero h1 span { display: block; white-space: nowrap; }
.hero__lead { font-size: var(--s-lead); line-height: 1.42; max-width: 28em; margin-top: 28px; }
.hero__cta { display: flex; align-items: center; gap: 28px; flex-wrap: wrap; margin-top: 36px; }

/* The ho so doanh nghiep: thong tin that, de doi chieu */
.card {
  background: var(--plate); color: var(--on-plate);
  padding: clamp(28px, 3.2vw, 44px);
}
.card__mark { width: 56px; height: 56px; margin: -6px 0 22px -6px; }
.card__name { font-size: clamp(1.375rem, 1.1rem + 0.8vw, 1.75rem); line-height: 1.12; color: var(--on-plate); letter-spacing: 0; }
.card__en { color: var(--on-plate-2); font-size: 0.9375rem; margin-top: 6px; letter-spacing: 0.02em; }
.card__facts { margin: 26px 0 0; display: grid; gap: 14px; }
.card__facts div { padding-top: 14px; border-top: 1px solid rgba(255, 255, 255, 0.22); }
.card__facts dt { font-size: var(--s-small); color: var(--on-plate-2); }
.card__facts dd { margin: 2px 0 0; font-weight: 500; }
.card a { color: var(--on-plate); text-underline-offset: 0.22em; }
.card a:hover { color: var(--plot); }
.card__more { display: inline-block; margin-top: 26px; font-weight: 600; }

/* ---------- Muc chung ---------- */
.sec { padding-block: var(--sec); }
.sec--plate { background: var(--plate); color: var(--on-plate); }
.sec--plate h2 { color: var(--on-plate); }
.sec--tone { background: var(--tone); }
.sec--paper { background: var(--paper); }
.sec h2 { font-size: var(--s-head); line-height: 1.04; letter-spacing: -0.015em; }
.sec__head { max-width: 46rem; margin-bottom: clamp(40px, 5vw, 64px); }
.sec__head p { margin-top: 20px; max-width: 40em; }

/* ---------- Dich vu: luoi 2x2, moi o mo dau bang mot vach dam ---------- */
.svc { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: clamp(40px, 5vw, 64px) clamp(32px, 5vw, 80px); }
.svc__item { border-top: 3px solid var(--ink); padding-top: 22px; }
.svc__item h3 {
  font-size: clamp(1.75rem, 1.3rem + 1.4vw, 2.5rem); line-height: 1.05; letter-spacing: -0.01em;
  margin-bottom: 14px;
}
.svc__item p { max-width: 34em; }

/* ---------- Vi sao ---------- */
.why { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: 40px clamp(40px, 6vw, 96px); align-items: end; }
.statement {
  font-size: clamp(1.35rem, 1.05rem + 1.1vw, 2rem); line-height: 1.3; font-weight: 500;
  margin-top: clamp(24px, 3vw, 36px); max-width: 24em;
}
.why__side { color: #E6ECF5; font-size: var(--s-body); }

/* ---------- Quy trinh: bon buoc, danh so bang counter cua danh sach ---------- */
.steps {
  list-style: none; margin: 0; padding: 0; counter-reset: buoc;
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 40px clamp(24px, 3vw, 44px);
}
.steps li { counter-increment: buoc; border-top: 3px solid var(--plate); padding-top: 22px; }
.steps h3 { font-size: clamp(1.25rem, 1.1rem + 0.5vw, 1.5rem); line-height: 1.15; margin-bottom: 12px; }
.steps h3::before {
  content: "Bước " counter(buoc); display: block; margin-bottom: 10px;
  font-size: var(--s-small); font-weight: 600; font-stretch: 100%; letter-spacing: 0; color: var(--plate);
}

/* ---------- Hoi dap: details/summary, khong can JS ---------- */
.faq { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 40px clamp(40px, 6vw, 96px); align-items: start; }
.faq__head p { margin-top: 20px; max-width: 26em; }
.faq__list { border-top: 1px solid var(--rule); }
.faq__list details { border-bottom: 1px solid var(--rule); }
.faq__list summary {
  position: relative; display: block; list-style: none; cursor: pointer;
  padding: 20px 48px 20px 0; font-weight: 600; font-size: clamp(1.0625rem, 1rem + 0.3vw, 1.25rem); line-height: 1.35;
  transition: color var(--t-hover) var(--ease-out);
}
.faq__list summary::-webkit-details-marker { display: none; }
.faq__list summary::before, .faq__list summary::after {
  content: ""; position: absolute; right: 8px; top: 50%; width: 16px; height: 2px; margin-top: -1px;
  background: var(--plate); transition: transform 240ms var(--ease-out);
}
.faq__list summary::after { transform: rotate(90deg); }
.faq__list details[open] summary::after { transform: rotate(0deg); }
.faq__list summary:hover { color: var(--plate); }
.faq__list summary:focus-visible { outline: 3px solid var(--plot); outline-offset: 2px; }
.faq__list details p { padding-bottom: 22px; max-width: 38em; color: var(--ink-2); }

/* ---------- Lien he ---------- */
.contact { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: 48px clamp(40px, 6vw, 96px); align-items: start; }
.contact__lead { margin-top: 20px; max-width: 34em; }
.contact__big { display: grid; gap: 20px; margin-top: 36px; }
.contact__big p + p { margin-top: 0; }
.contact__big span { display: block; font-size: var(--s-small); color: var(--muted); }
.contact__big a {
  display: inline-block; padding-block: 4px;
  font-stretch: var(--narrow); font-weight: 620; font-size: clamp(1.875rem, 1.2rem + 2.6vw, 3.25rem);
  line-height: 1.05; letter-spacing: -0.01em; color: var(--ink); text-decoration: none;
  overflow-wrap: anywhere;
}
.contact__big a:hover { color: var(--plate); }
.info { margin: 0; display: grid; gap: 22px; background: var(--paper); padding: clamp(24px, 3vw, 36px); }
.info dt { font-size: var(--s-small); color: var(--muted); }
.info dd { margin: 2px 0 0; }
.info dd a[target] { display: block; margin-top: 6px; font-size: 1rem; }

/* ---------- Chan trang ---------- */
.ft { background: var(--foot); color: var(--on-foot); font-size: 0.9375rem; }
.ft__in { padding-block: clamp(48px, 6vw, 80px) 32px; }
.ft__logo { height: 40px; width: auto; margin-bottom: 40px; }
.ft__cols { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 32px clamp(24px, 3vw, 48px); }
.ft__h { font: 600 0.9375rem/1.4 var(--f); color: #fff; margin-bottom: 8px; letter-spacing: 0; }
.ft p + p { margin-top: 6px; }
.ft a { color: #fff; text-decoration: none; }
.ft__cols a { display: inline-block; padding-block: 5px; }
.ft a:hover { color: var(--plot); }
.ft__copy { margin-top: 48px; font-size: var(--s-small); }

/* ---------- Trang phap ly ---------- */
.page-hd__in { padding-block: clamp(48px, 7vw, 104px) clamp(32px, 4vw, 56px); }
.page-hd h1 { font-size: var(--s-head); line-height: 1.04; letter-spacing: -0.015em; }
.page-hd__lead { font-size: var(--s-lead); line-height: 1.4; max-width: 32em; margin-top: 24px; }
.page-hd__meta { font-size: var(--s-small); color: var(--muted); margin-top: 18px; }
.doc { padding-block: clamp(24px, 4vw, 48px) var(--sec); }
.doc > * { max-width: 920px; }
.doc h2 { font-size: clamp(1.5rem, 1.2rem + 1.1vw, 2.125rem); line-height: 1.1; margin-top: 1.8em; margin-bottom: 0.6em; }
.doc h2:first-child { margin-top: 0; }
.doc p, .doc li { max-width: 40em; }
.doc ul { list-style: disc; padding-left: 1.2em; margin: 0.8em 0; }
.doc li + li { margin-top: 0.4em; }
.doc ul + p { margin-top: 0.9em; }
.facts { margin: 0; background: var(--paper); padding: 8px clamp(20px, 3vw, 36px); }
.facts__row { display: grid; grid-template-columns: 15em 1fr; gap: 4px 28px; padding: 16px 0; }
.facts__row + .facts__row { border-top: 1px solid var(--tone); }
.facts dt { font-size: var(--s-small); color: var(--muted); padding-top: 3px; }
.facts dd { margin: 0; font-weight: 600; overflow-wrap: anywhere; }
.facts dd small { display: block; font-weight: 400; font-size: var(--s-small); color: var(--muted); margin-top: 2px; }

/* ---------- Man hinh hep ---------- */
@media (max-width: 1000px) {
  .hero__in, .why, .contact, .faq { grid-template-columns: 1fr; }
  .card { max-width: 560px; }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .ft__cols { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 900px) {
  .nav-toggle {
    display: inline-flex; flex-direction: column; justify-content: center; gap: 7px;
    width: 44px; height: 44px; padding: 0 10px; background: transparent; border: 0; cursor: pointer;
  }
  .nav-toggle span { display: block; height: 2px; background: var(--ink); transition: transform 240ms var(--ease-out); }
  .nav-toggle[aria-expanded="true"] span:first-child { transform: translateY(4.5px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] span:last-child { transform: translateY(-4.5px) rotate(-45deg); }
  .hdr__in { min-height: 64px; gap: 12px; }
  .hdr__cta { display: none; }
  .nav {
    position: absolute; left: 0; right: 0; top: 100%;
    flex-direction: column; gap: 0; background: var(--paper);
    padding: 8px var(--gut) 24px; border-bottom: 3px solid var(--plate);
  }
  .nav[hidden] { display: none; }
  .nav a { padding: 14px 0; font-size: 1.125rem; background: none; }
  .facts__row { grid-template-columns: 1fr; }
}
@media (min-width: 901px) {
  .nav[hidden] { display: flex; }
}
@media (max-width: 700px) {
  .svc, .steps { grid-template-columns: 1fr; }
  .steps { gap: 32px; }
}
@media (max-width: 560px) {
  .ft__cols { grid-template-columns: 1fr; }
}

/* ---------- Chuyen dong ----------
   Noi dung luon hien khi khong co JS: trang thai an chi ap dung duoi html.r-on,
   lop nay do main.js tu them. Chi transform va opacity, khong lam doi bo cuc (CLS 0).
   Tieu de va doan mo ta dau trang khong co hieu ung: chung la phan tu LCP. */
@media (prefers-reduced-motion: no-preference) {
  /* Tai trang: the ho so truot len nhe, cac dong thong tin den lan luot */
  .card { animation: len 900ms var(--ease-expo) both 120ms; }
  .card__facts div { animation: len 700ms var(--ease-expo) both; }
  .card__facts div:nth-child(1) { animation-delay: 300ms; }
  .card__facts div:nth-child(2) { animation-delay: 380ms; }
  .card__facts div:nth-child(3) { animation-delay: 460ms; }
  .card__facts div:nth-child(4) { animation-delay: 540ms; }
  @keyframes len { from { transform: translateY(18px); } }

  /* Tung phan cua moi muc den lan luot khi cuon toi */
  html.r-on [data-r] {
    opacity: 0; transform: translateY(24px);
    transition: opacity var(--t-reveal) var(--ease-expo), transform var(--t-reveal) var(--ease-expo);
    transition-delay: calc(var(--i, 0) * 85ms);
  }
  html.r-on [data-r].in { opacity: 1; transform: none; }

  /* Vach dau moi o dich vu va moi buoc chay ra khi o hien */
  html.r-on .svc__item, html.r-on .steps li { border-top-color: transparent; position: relative; }
  html.r-on .svc__item::before, html.r-on .steps li::before {
    content: ""; position: absolute; left: 0; right: 0; top: -3px; height: 3px;
    background: var(--ink); transform: scaleX(0); transform-origin: left;
    transition: transform 900ms var(--ease-expo); transition-delay: calc(var(--i, 0) * 85ms + 150ms);
  }
  html.r-on .steps li::before { background: var(--plate); }
  html.r-on .svc__item.in::before, html.r-on .steps li.in::before { transform: none; }
}

/* ---------- In ---------- */
@media print {
  .hdr, .hero__cta, .nav-toggle { display: none; }
  body { background: #fff; color: #000; font-size: 11pt; }
  .sec--plate, .sec--tone, .ft { background: #fff !important; color: #000 !important; }
  .sec--plate h2, .card, .card *, .ft__h, .ft a { color: #000 !important; }
  .card { background: #fff !important; border: 1px solid #000; }
  [data-r] { opacity: 1 !important; transform: none !important; }
}