/* ==========================================================================
   AN TRẠCH — hệ thống thị giác "MẶT CẮT CẤU TẠO"
   Mọi trang đọc như một bản vẽ mặt cắt: cột số hiệu lớp bên trái, các dải
   vật liệu xếp chồng, nhãn dẫn ra lề kèm số đo.
   ========================================================================== */

:root {
  --paper:      #F2EFE9;
  --paper-2:    #E9E4DA;
  --paper-3:    #DFD9CC;
  --moss:       #3A4A3F;
  --moss-deep:  #2A362E;
  --ink:        #1D231E;
  --cement:     #8A8985;
  --cement-lt:  #B7B5AE;
  --brass:      #B08543;
  --brass-lt:   #D2A85F;
  --rule:       rgba(29, 35, 30, 0.20);
  --rule-soft:  rgba(29, 35, 30, 0.10);
  --rule-onmoss: rgba(242, 239, 233, 0.22);

  --gutter: 104px;
  --wrap: 1280px;

  --f-display: "Archivo", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --f-text: "Be Vietnam Pro", "Segoe UI", Roboto, Arial, sans-serif;
  --f-dim: "Roboto Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  --s1: 4px;  --s2: 8px;  --s3: 12px; --s4: 16px; --s5: 24px;
  --s6: 32px; --s7: 48px; --s8: 72px; --s9: 104px; --s10: 144px;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--f-text);
  font-size: 16.5px;
  line-height: 1.66;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: inherit; }

h1, h2, h3, h4 {
  font-family: var(--f-display);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: -0.022em;
  margin: 0;
  text-wrap: balance;
}

p { margin: 0 0 1.05em; }
p:last-child { margin-bottom: 0; }

::selection { background: var(--brass); color: #fff; }

.skip {
  position: absolute; left: -9999px; top: 0;
  background: var(--moss); color: var(--paper);
  padding: 12px 18px; z-index: 200; font-family: var(--f-dim); font-size: 12px;
}
.skip:focus { left: 0; }

:focus-visible { outline: 2px solid var(--brass); outline-offset: 3px; }

/* --------------------------------------------------------------- hatches */
/* Hatch = ký hiệu vật liệu trên bản vẽ mặt cắt. */
.hatch-concrete {
  background-image: repeating-linear-gradient(45deg,
    rgba(29,35,30,.085) 0 1px, transparent 1px 9px);
}
.hatch-mortar {
  background-image: radial-gradient(rgba(29,35,30,.14) 1px, transparent 1.2px);
  background-size: 9px 9px;
}
.hatch-timber {
  background-image: repeating-linear-gradient(0deg,
    rgba(29,35,30,.09) 0 1px, transparent 1px 7px);
}
.hatch-onmoss {
  background-image: repeating-linear-gradient(45deg,
    rgba(242,239,233,.09) 0 1px, transparent 1px 10px);
}

/* ------------------------------------------------------------- masthead */
.masthead {
  position: sticky; top: 0; z-index: 90;
  background: var(--paper);
  border-bottom: 1px solid var(--ink);
}
.masthead__in {
  max-width: var(--wrap); margin: 0 auto;
  padding: 0 var(--s5);
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--s5);
  min-height: 84px;
}
.brand { text-decoration: none; display: block; padding: 14px 0; }
.brand__name {
  font-family: var(--f-display);
  font-weight: 800;
  font-size: 23px;
  letter-spacing: 0.16em;
  line-height: 1;
  display: block;
}
.brand__sub {
  display: block;
  font-family: var(--f-dim);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--cement);
  margin-top: 6px;
}
.nav { display: flex; gap: var(--s5); justify-content: center; flex-wrap: wrap; }
.nav a {
  text-decoration: none;
  font-size: 14.5px;
  font-weight: 500;
  padding: 6px 0;
  position: relative;
  color: var(--ink);
}
.nav a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 2px;
  background: var(--brass);
  transform: scaleX(0); transform-origin: left;
  transition: transform .3s cubic-bezier(.2,.7,.3,1);
}
.nav a:hover::after, .nav a[aria-current="page"]::after { transform: scaleX(1); }
.nav a[aria-current="page"] { color: var(--moss); }

.masthead__act { display: flex; align-items: center; gap: var(--s4); }

.lang {
  display: inline-flex;
  border: 1px solid var(--ink);
  font-family: var(--f-dim);
  font-size: 11px;
  letter-spacing: .08em;
}
.lang button {
  appearance: none; border: 0; background: transparent; cursor: pointer;
  font: inherit; color: var(--ink);
  padding: 7px 11px; line-height: 1;
  transition: transform .25s ease;
}
.lang button + button { border-left: 1px solid var(--ink); }
.lang button.is-on { background: var(--ink); color: var(--paper); }
.lang button:not(.is-on):hover { transform: translateY(-1px); }

/* ---------------------------------------------------------------- button */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--f-display); font-weight: 600; font-size: 14.5px;
  letter-spacing: .01em;
  padding: 14px 22px;
  text-decoration: none;
  border: 1px solid var(--ink);
  background: var(--paper);
  color: var(--ink);
  cursor: pointer;
  position: relative;
  transition: transform .3s cubic-bezier(.2,.7,.3,1);
}
.btn::after {
  content: ""; position: absolute; inset: 4px -4px -4px 4px;
  border: 1px solid var(--ink); z-index: -1;
  transform: translate(0, 0);
  transition: transform .3s cubic-bezier(.2,.7,.3,1);
}
.btn:hover { transform: translate(-3px, -3px); }
.btn:hover::after { transform: translate(3px, 3px); }
.btn--brass { background: var(--brass); border-color: var(--brass); color: #fff; }
.btn--brass::after { border-color: var(--ink); }
.btn--sm { padding: 10px 15px; font-size: 13px; }
.btn--onmoss { background: transparent; border-color: var(--rule-onmoss); color: var(--paper); }
.btn--onmoss::after { border-color: var(--rule-onmoss); }

/* ----------------------------------------------------------- layer bands */
.layer {
  border-bottom: 1px solid var(--ink);
  position: relative;
}
.layer__in {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: var(--s9) var(--s5) var(--s9) 0;
  display: grid;
  grid-template-columns: var(--gutter) 1fr;
  gap: 0;
}
.layer--tight .layer__in { padding-top: var(--s8); padding-bottom: var(--s8); }

/* cột số hiệu lớp — chạy dọc suốt trang, đây là "thước" của bản vẽ */
.gauge {
  border-right: 1px solid var(--ink);
  padding: 0 var(--s4) 0 var(--s5);
  position: relative;
}
.gauge__no {
  font-family: var(--f-dim);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .12em;
  color: var(--brass);
  display: block;
  position: sticky;
  top: 108px;
}
.gauge__label {
  position: sticky; top: 132px;
  display: block;
  font-family: var(--f-dim);
  font-size: 10px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--cement);
  writing-mode: vertical-rl;
  margin-top: 14px;
  height: 190px;
}
.gauge::after {
  content: ""; position: absolute; right: -1px; top: 0; width: 9px; height: 1px;
  background: var(--ink);
}

.layer__body { padding-left: var(--s7); min-width: 0; }

.layer--moss { background: var(--moss); color: var(--paper); border-bottom-color: var(--moss-deep); }
.layer--moss .gauge { border-right-color: var(--rule-onmoss); }
.layer--moss .gauge::after { background: var(--rule-onmoss); }
.layer--moss .gauge__label { color: rgba(242,239,233,.55); }
.layer--moss .gauge__no { color: var(--brass-lt); }
.layer--paper2 { background: var(--paper-2); }
.layer--paper3 { background: var(--paper-3); }

/* ------------------------------------------------------------ typography */
.eyebrow {
  font-family: var(--f-dim);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--brass);
  margin: 0 0 var(--s4);
  display: block;
}
.layer--moss .eyebrow { color: var(--brass-lt); }

.h-sec { font-size: clamp(30px, 3.9vw, 50px); max-width: 20ch; }
.h-page { font-size: clamp(38px, 5.4vw, 74px); max-width: 16ch; }
.lede {
  font-size: clamp(16.5px, 1.35vw, 19px);
  line-height: 1.62;
  color: #414a41;
  max-width: 62ch;
  margin-top: var(--s5);
}
.layer--moss .lede { color: rgba(242,239,233,.82); }
.dim {
  font-family: var(--f-dim);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--cement);
}

/* --------------------------------------------------------------- section
   .sec-head = tiêu đề lớp + ghi chú dẫn ra lề phải */
.sec-head {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: var(--s6);
  border-bottom: 1px solid var(--rule);
  padding-bottom: var(--s5);
  margin-bottom: var(--s7);
}
.layer--moss .sec-head { border-bottom-color: var(--rule-onmoss); }
.sec-head__note {
  font-family: var(--f-dim); font-size: 11.5px; letter-spacing: .06em;
  color: var(--cement); text-align: right; white-space: nowrap;
}

/* ------------------------------------------------------------------ hero */
.hero { border-bottom: 1px solid var(--ink); background: var(--paper); overflow: hidden; }
.hero__in {
  max-width: var(--wrap); margin: 0 auto;
  display: grid;
  grid-template-columns: var(--gutter) 1fr 46%;
  min-height: 560px;
}
.hero__gauge {
  border-right: 1px solid var(--ink);
  padding: var(--s7) var(--s4) var(--s5) var(--s5);
  display: flex; flex-direction: column; justify-content: space-between;
}
.hero__datumtick {
  font-family: var(--f-dim); font-size: 11px; letter-spacing: .1em; color: var(--brass);
}
.hero__sheet {
  font-family: var(--f-dim); font-size: 10px; letter-spacing: .16em;
  color: var(--cement); writing-mode: vertical-rl; text-transform: uppercase;
}
.hero__text {
  padding: var(--s7) var(--s7) var(--s7) var(--s7);
  display: flex; flex-direction: column; justify-content: center;
}
.hero__kicker {
  font-family: var(--f-dim); font-size: 11px; letter-spacing: .2em;
  text-transform: uppercase; color: var(--moss);
  padding-bottom: var(--s4); margin-bottom: var(--s5);
  border-bottom: 1px solid var(--ink);
}
.hero h1 {
  font-size: clamp(34px, 4.1vw, 57px);
  letter-spacing: -0.03em;
}
.hero h1 em {
  font-style: normal;
  color: var(--brass);
  display: block;
}
.hero__sub { margin-top: var(--s4); max-width: 48ch; font-size: 16.5px; color: #414a41; }
.hero__acts { margin-top: var(--s5); display: flex; gap: var(--s4); flex-wrap: wrap; }
.hero__plate { position: relative; border-left: 1px solid var(--ink); overflow: hidden; }
.hero__plate img { width: 100%; height: 100%; object-fit: cover; }
.hero__cap {
  position: absolute; left: 0; bottom: 0; right: 0;
  background: var(--ink); color: var(--paper);
  font-family: var(--f-dim); font-size: 11px; letter-spacing: .06em;
  padding: 10px 14px;
  display: flex; justify-content: space-between; gap: var(--s4);
}

/* thanh cốt — dải số năng lực chạy hết chiều rộng dưới hero */
.datum { background: var(--ink); color: var(--paper); border-bottom: 1px solid var(--ink); }
.datum__in {
  max-width: var(--wrap); margin: 0 auto;
  display: grid; grid-template-columns: repeat(4, 1fr);
}
.datum__cell {
  padding: var(--s5) var(--s5);
  border-left: 1px solid rgba(242,239,233,.18);
  display: flex; align-items: baseline; gap: var(--s3);
}
.datum__cell:first-child { border-left: 0; padding-left: var(--s5); }
.datum__n {
  font-family: var(--f-display); font-weight: 700; font-size: 34px;
  letter-spacing: -.02em; color: var(--brass-lt); line-height: 1;
}
.datum__t { font-family: var(--f-dim); font-size: 11.5px; letter-spacing: .05em; color: rgba(242,239,233,.72); line-height: 1.35; }

/* ------------------------------------------------- spec / leader devices
   Chi tiết chữ ký: đường gióng chấm tự kéo dài ra tới nhãn số đo. */
.spec {
  display: grid;
  grid-template-columns: max-content 1fr max-content;
  align-items: center;
  gap: 0 12px;
  padding: 13px 0;
  border-bottom: 1px solid var(--rule-soft);
}
.layer--moss .spec { border-bottom-color: var(--rule-onmoss); }
.spec__k { font-size: 14.5px; font-weight: 500; }
.spec__lead {
  height: 1px;
  position: relative;
  border-bottom: 1px dashed var(--cement);
  transform: scaleX(.28);
  transform-origin: left center;
  transition: transform .5s cubic-bezier(.2,.7,.3,1);
}
.spec__lead::after {
  content: ""; position: absolute; right: 0; top: -3px;
  width: 1px; height: 7px; background: var(--cement);
}
.layer--moss .spec__lead { border-bottom-color: rgba(242,239,233,.4); }
.layer--moss .spec__lead::after { background: rgba(242,239,233,.55); }
.spec__v { font-family: var(--f-dim); font-size: 13px; color: var(--moss); white-space: nowrap; }
.layer--moss .spec__v { color: var(--brass-lt); }
.spec:hover .spec__lead,
.card:hover .spec__lead,
.card:focus-within .spec__lead { transform: scaleX(1); }

/* ------------------------------------------------------------- packages */
.pkgs { display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid var(--ink); }
.pkg {
  border-bottom: 1px solid var(--ink);
  border-right: 1px solid var(--ink);
  padding: var(--s6) var(--s6) var(--s6) 0;
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: var(--s5);
  transition: transform .35s cubic-bezier(.2,.7,.3,1);
}
.pkg:nth-child(2n) { border-right: 0; }
.pkg:hover { transform: translateY(-3px); }
/* "bề dày lớp" — thanh vật liệu dựng đứng, đậm dần theo cấp gói */
.pkg__thick { position: relative; background: var(--paper-3); }
.pkg__thick span {
  position: absolute; left: 0; right: 0; bottom: 0;
  background: var(--moss);
  transition: transform .5s cubic-bezier(.2,.7,.3,1);
  transform-origin: bottom;
}
.pkg:hover .pkg__thick span { transform: scaleY(1.06); }
.pkg h3 { font-size: 21px; margin-bottom: var(--s3); }
.pkg__price {
  font-family: var(--f-dim); font-size: 15px; color: var(--brass);
  font-weight: 500; margin-top: var(--s4); display: block;
}
.pkg ul { list-style: none; margin: var(--s3) 0 0; padding: 0; }
.pkg li {
  font-size: 14.5px; color: #4a534a; padding-left: 18px; position: relative;
  margin-bottom: 5px;
}
.pkg li::before {
  content: ""; position: absolute; left: 0; top: .72em;
  width: 9px; height: 1px; background: var(--cement);
}

/* --------------------------------------------------------------- process */
.steps { border-top: 1px solid var(--rule-onmoss); }
.step {
  display: grid;
  grid-template-columns: 74px 1fr 1fr;
  gap: var(--s5);
  padding: var(--s5) 0;
  border-bottom: 1px solid var(--rule-onmoss);
  align-items: start;
  transition: transform .35s cubic-bezier(.2,.7,.3,1);
}
.step:hover { transform: translateX(6px); }
.step__n { font-family: var(--f-dim); font-size: 12px; color: var(--brass-lt); letter-spacing: .1em; padding-top: 4px; }
.step h3 { font-size: 20px; color: var(--paper); }
.step p { font-size: 14.5px; color: rgba(242,239,233,.74); margin: 0; }

/* --------------------------------------------------------------- pledges */
.pledges { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0; border-top: 1px solid var(--rule); }
.pledge {
  border-bottom: 1px solid var(--rule);
  border-right: 1px solid var(--rule);
  padding: var(--s6) var(--s6) var(--s6) 0;
}
.pledge:nth-child(2n) { border-right: 0; padding-right: 0; }
.pledge__no { font-family: var(--f-dim); font-size: 11px; color: var(--brass); letter-spacing: .14em; }
.pledge h3 { font-size: 19px; margin: var(--s3) 0 var(--s3); }
.pledge p { font-size: 14.5px; color: #4a534a; margin: 0; }

/* -------------------------------------------------------------- projects */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--s6); }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--s6); }

.card {
  background: var(--paper);
  border: 1px solid var(--ink);
  display: flex; flex-direction: column;
  text-decoration: none;
  transition: transform .38s cubic-bezier(.2,.7,.3,1);
}
.card:hover { transform: translateY(-5px); }
.card__plate { position: relative; overflow: hidden; border-bottom: 1px solid var(--ink); }
.card__plate img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; transition: transform .8s cubic-bezier(.2,.7,.3,1); }
.card:hover .card__plate img { transform: scale(1.045); }
.card__tag {
  position: absolute; top: 0; left: 0;
  background: var(--ink); color: var(--paper);
  font-family: var(--f-dim); font-size: 10.5px; letter-spacing: .1em;
  padding: 6px 10px; text-transform: uppercase;
}
.card__body { padding: var(--s5); flex: 1; display: flex; flex-direction: column; }
.card h3 { font-size: 19px; margin-bottom: 6px; }
.card__area { font-family: var(--f-dim); font-size: 12px; color: var(--cement); margin-bottom: var(--s4); }
.card__specs { margin-top: auto; }
.card__specs .spec { padding: 8px 0; }
.card__specs .spec:last-child { border-bottom: 0; }

/* filter bar (trang công trình) */
.filters { display: flex; gap: var(--s3); flex-wrap: wrap; margin-bottom: var(--s6); }
.filters button {
  appearance: none; cursor: pointer;
  font-family: var(--f-dim); font-size: 12px; letter-spacing: .08em;
  padding: 9px 16px; background: transparent;
  border: 1px solid var(--ink); color: var(--ink);
  transition: transform .28s cubic-bezier(.2,.7,.3,1);
}
.filters button:hover { transform: translateY(-2px); }
.filters button.is-on { background: var(--ink); color: var(--paper); }

/* ----------------------------------------------------------- plan models */
.plan { border: 1px solid var(--ink); background: var(--paper); display: flex; flex-direction: column;
  transition: transform .38s cubic-bezier(.2,.7,.3,1); }
.plan:hover { transform: translateY(-5px); }
.plan__code {
  font-family: var(--f-dim); font-size: 12px; letter-spacing: .14em;
  background: var(--moss); color: var(--paper); padding: 8px 12px;
}
.plan__plate { border-bottom: 1px solid var(--ink); overflow: hidden; }
.plan__plate img { aspect-ratio: 16 / 10; object-fit: cover; width: 100%;
  transition: transform .8s cubic-bezier(.2,.7,.3,1); }
.plan:hover .plan__plate img { transform: scale(1.04); }
.plan__body { padding: var(--s5); display: flex; flex-direction: column; flex: 1; }
.plan h3 { font-size: 19px; margin-bottom: var(--s4); }
.plan__cta { margin-top: var(--s5); }

/* ------------------------------------------------------------- quotes */
.quote { border-top: 2px solid var(--ink); padding-top: var(--s5); }
.quote p { font-family: var(--f-display); font-size: 19.5px; line-height: 1.42; letter-spacing: -.015em; }
.quote footer { font-family: var(--f-dim); font-size: 12px; color: var(--cement); margin-top: var(--s4); }

/* -------------------------------------------------------------- articles */
.post { border-top: 1px solid var(--ink); padding-top: var(--s5); text-decoration: none; display: block;
  transition: transform .35s cubic-bezier(.2,.7,.3,1); }
.post:hover { transform: translateY(-4px); }
.post__plate { overflow: hidden; margin-bottom: var(--s4); border: 1px solid var(--rule); }
.post__plate img { aspect-ratio: 3 / 2; object-fit: cover; width: 100%;
  transition: transform .8s cubic-bezier(.2,.7,.3,1); }
.post:hover .post__plate img { transform: scale(1.05); }
.post__meta { font-family: var(--f-dim); font-size: 11.5px; color: var(--cement); letter-spacing: .05em; margin-bottom: var(--s3); }
.post h3 { font-size: 20px; margin-bottom: var(--s3); }
.post p { font-size: 14.5px; color: #4a534a; }

/* bài viết chi tiết */
.article { max-width: 720px; }
.article h2 {
  font-size: clamp(23px, 2.4vw, 30px);
  margin: var(--s8) 0 var(--s4);
  padding-top: var(--s4);
  border-top: 1px solid var(--rule);
}
.article h3 { font-size: 19px; margin: var(--s6) 0 var(--s3); }
.article p, .article li { font-size: 16.5px; line-height: 1.78; color: #2c332d; }
.article ul, .article ol { padding-left: 20px; margin: 0 0 1.05em; }
.article li { margin-bottom: 7px; }
.article strong { font-weight: 600; color: var(--ink); }
.article table { width: 100%; border-collapse: collapse; margin: var(--s5) 0; font-size: 14.5px; }
.article th, .article td { border: 1px solid var(--rule); padding: 10px 12px; text-align: left; vertical-align: top; }
.article th { background: var(--paper-2); font-family: var(--f-dim); font-size: 12px; letter-spacing: .05em; font-weight: 500; }
.article figure { margin: var(--s6) 0; }
.article figure img { border: 1px solid var(--ink); }
.article figcaption { font-family: var(--f-dim); font-size: 11.5px; color: var(--cement); margin-top: var(--s3); }

.toc { border: 1px solid var(--ink); background: var(--paper-2); padding: var(--s5); margin-bottom: var(--s7); }
.toc__t { font-family: var(--f-dim); font-size: 11px; letter-spacing: .16em; text-transform: uppercase; color: var(--brass); margin-bottom: var(--s3); }
.toc ol { margin: 0; padding-left: 20px; }
.toc li { font-size: 14.5px; margin-bottom: 5px; }
.toc a { text-decoration: none; border-bottom: 1px solid var(--rule); }
.toc a:hover { border-bottom-color: var(--brass); }

.byline { font-family: var(--f-dim); font-size: 12px; color: var(--cement); letter-spacing: .05em; margin-top: var(--s5); }

/* ------------------------------------------------------------------ form */
.quoteform { background: var(--paper); border: 1px solid var(--ink); padding: var(--s6); }
.field { margin-bottom: var(--s4); }
.field label {
  display: block; font-family: var(--f-dim); font-size: 11px;
  letter-spacing: .12em; text-transform: uppercase; color: var(--moss); margin-bottom: 7px;
}
.field input, .field select, .field textarea {
  width: 100%; font-family: var(--f-text); font-size: 15.5px; color: var(--ink);
  padding: 12px 13px; background: var(--paper-2);
  border: 1px solid var(--rule); border-bottom: 1px solid var(--ink);
  transition: transform .25s ease;
}
.field input:focus, .field select:focus, .field textarea:focus { transform: translateY(-2px); }
.field textarea { min-height: 96px; resize: vertical; }
.form-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--s4); }
.form-row-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--s4); }
.formnote { font-family: var(--f-dim); font-size: 11.5px; color: var(--cement); margin-top: var(--s4); }

/* --------------------------------------------------------------- prepare */
.prep { list-style: none; margin: 0; padding: 0; }
.prep li {
  border-bottom: 1px solid var(--rule); padding: 13px 0;
  display: flex; justify-content: space-between; gap: var(--s4);
  font-size: 15px;
}
.prep li span:last-child { font-family: var(--f-dim); font-size: 12.5px; color: var(--cement); text-align: right; }

/* ------------------------------------------------------------- site map */
.mapblock {
  border: 1px solid var(--ink);
  background: var(--paper-2);
  padding: var(--s6);
  position: relative;
  min-height: 260px;
}
.mapblock__grid {
  position: absolute; inset: 0;
  background-image:
    repeating-linear-gradient(0deg, var(--rule-soft) 0 1px, transparent 1px 26px),
    repeating-linear-gradient(90deg, var(--rule-soft) 0 1px, transparent 1px 26px);
}
.mapblock__pin { position: relative; margin-bottom: var(--s5); }
.mapblock__pin b { font-family: var(--f-dim); font-size: 11px; letter-spacing: .12em; color: var(--brass); display: block; margin-bottom: 5px; }
.mapblock__pin span { font-size: 15px; }

/* ---------------------------------------------------------------- footer */
.site-foot { background: var(--moss-deep); color: rgba(242,239,233,.8); }
.site-foot__in {
  max-width: var(--wrap); margin: 0 auto; padding: var(--s8) var(--s5);
  display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.1fr; gap: var(--s6);
}
.site-foot h4 {
  font-family: var(--f-dim); font-size: 10.5px; letter-spacing: .16em;
  text-transform: uppercase; color: var(--brass-lt); font-weight: 500; margin-bottom: var(--s4);
}
.site-foot ul { list-style: none; margin: 0; padding: 0; }
.site-foot li { margin-bottom: 9px; font-size: 14.5px; }
.site-foot a { text-decoration: none; border-bottom: 1px solid transparent; transition: transform .25s ease; display: inline-block; }
.site-foot a:hover { border-bottom-color: var(--brass-lt); transform: translateX(3px); }
.site-foot__brand { font-family: var(--f-display); font-weight: 800; font-size: 21px; letter-spacing: .16em; color: var(--paper); margin-bottom: var(--s4); }
.site-foot p { font-size: 14.5px; }
.site-foot__base {
  border-top: 1px solid var(--rule-onmoss);
  max-width: var(--wrap); margin: 0 auto; padding: var(--s5);
  display: flex; justify-content: space-between; gap: var(--s5); flex-wrap: wrap;
  font-family: var(--f-dim); font-size: 11.5px; letter-spacing: .04em;
  color: rgba(242,239,233,.55);
}

/* ------------------------------------------------------------- CTA layer */
.ctaband__in { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s8); align-items: start; }
.callout { font-family: var(--f-dim); font-size: 14px; letter-spacing: .04em; }
.callout b { color: var(--brass); font-size: 22px; letter-spacing: .02em; display: block; margin-top: 6px; }

/* ================================================================ MOTION
   Bất biến: reveal chỉ dùng transform. opacity không bao giờ tham gia. */
.reveal {
  transform: translateY(20px);
  transition: transform .78s cubic-bezier(.16,.72,.28,1);
  will-change: transform;
}
.reveal.is-visible { transform: none; }
.reveal--d1 { transition-delay: .07s; }
.reveal--d2 { transition-delay: .14s; }
.reveal--d3 { transition-delay: .21s; }
.reveal--x { transform: translateX(-22px); }
.reveal--x.is-visible { transform: none; }

/* Hero entrance — transform-only, stagger qua animation-delay */
@keyframes strata-rise { from { transform: translateY(22px); } to { transform: none; } }
@keyframes plate-set   { from { transform: translateY(30px) scale(1.03); } to { transform: none; } }
@keyframes rule-draw   { from { transform: scaleX(0); } to { transform: scaleX(1); } }

.hero__kicker { animation: rule-draw .7s cubic-bezier(.16,.72,.28,1) both; transform-origin: left; }
.hero h1        { animation: strata-rise .78s cubic-bezier(.16,.72,.28,1) .08s both; }
.hero__sub      { animation: strata-rise .78s cubic-bezier(.16,.72,.28,1) .16s both; }
.hero__acts     { animation: strata-rise .78s cubic-bezier(.16,.72,.28,1) .24s both; }
.hero__plate img{ animation: plate-set 1s cubic-bezier(.16,.72,.28,1) .1s both; }
.datum__cell:nth-child(1) { animation: strata-rise .6s cubic-bezier(.16,.72,.28,1) .30s both; }
.datum__cell:nth-child(2) { animation: strata-rise .6s cubic-bezier(.16,.72,.28,1) .36s both; }
.datum__cell:nth-child(3) { animation: strata-rise .6s cubic-bezier(.16,.72,.28,1) .42s both; }
.datum__cell:nth-child(4) { animation: strata-rise .6s cubic-bezier(.16,.72,.28,1) .48s both; }

/* Entrance của tiêu đề trang trong — cùng ngữ pháp với hero, chỉ transform */
.enter-1 { animation: strata-rise .7s cubic-bezier(.16,.72,.28,1) .02s both; }
.enter-2 { animation: strata-rise .74s cubic-bezier(.16,.72,.28,1) .10s both; }
.enter-3 { animation: strata-rise .74s cubic-bezier(.16,.72,.28,1) .18s both; }

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .001ms !important; animation-delay: 0s !important;
      transition-duration: .001ms !important; }
  .reveal { transform: none; }
  html { scroll-behavior: auto; }
}

/* ============================================================ RESPONSIVE */
@media (max-width: 1080px) {
  :root { --gutter: 76px; }
  .hero__in { grid-template-columns: var(--gutter) 1fr 40%; min-height: 560px; }
  .hero__text { padding: var(--s8) var(--s6) var(--s7) var(--s6); }
  .layer__body { padding-left: var(--s6); }
  .site-foot__in { grid-template-columns: 1fr 1fr; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 900px) {
  .masthead__in { grid-template-columns: 1fr auto; row-gap: 0; padding: 0 var(--s4); min-height: 0; }
  .nav {
    order: 3; grid-column: 1 / -1; justify-content: flex-start;
    border-top: 1px solid var(--rule); padding: 10px 0; gap: var(--s4);
    overflow-x: auto; flex-wrap: nowrap; white-space: nowrap;
  }
  .nav a { font-size: 13.5px; }
  .hero__in { grid-template-columns: 1fr; min-height: 0; }
  .hero__gauge {
    flex-direction: row; align-items: center; justify-content: space-between;
    border-right: 0; border-bottom: 1px solid var(--ink); padding: 12px var(--s4);
  }
  .hero__sheet { writing-mode: horizontal-tb; }
  .hero__text { padding: var(--s7) var(--s4); }
  .hero__plate { border-left: 0; border-top: 1px solid var(--ink); }
  .hero__plate img { height: 320px; }
  .datum__in { grid-template-columns: repeat(2, 1fr); }
  .datum__cell { border-top: 1px solid rgba(242,239,233,.18); }
  .datum__cell:nth-child(odd) { border-left: 0; }

  .layer__in { grid-template-columns: 1fr; padding: var(--s8) var(--s4); }
  .gauge {
    border-right: 0; border-bottom: 1px solid var(--rule);
    padding: 0 0 var(--s3); margin-bottom: var(--s5);
    display: flex; align-items: baseline; gap: var(--s4);
  }
  .gauge__no, .gauge__label { position: static; }
  .gauge__label { writing-mode: horizontal-tb; height: auto; margin-top: 0; }
  .gauge::after { display: none; }
  .layer--moss .gauge { border-bottom-color: var(--rule-onmoss); }
  .layer__body { padding-left: 0; }

  .pkgs, .pledges { grid-template-columns: 1fr; }
  .pkg, .pledge { border-right: 0; padding-right: 0; }
  .step { grid-template-columns: 54px 1fr; }
  .step p { grid-column: 2; }
  .grid-3, .grid-2 { grid-template-columns: repeat(2, 1fr); gap: var(--s5); }
  .ctaband__in { grid-template-columns: 1fr; gap: var(--s7); }
  .form-row, .form-row-2 { grid-template-columns: 1fr; }
  .sec-head { grid-template-columns: 1fr; align-items: start; gap: var(--s3); }
  .sec-head__note { text-align: left; white-space: normal; }
  .site-foot__in { grid-template-columns: 1fr; padding: var(--s7) var(--s4); }
  .article h2 { font-size: 24px; }
}

@media (max-width: 640px) {
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
}

@media (max-width: 520px) {
  body { font-size: 16px; }
  .datum__in { grid-template-columns: 1fr; }
  .datum__cell { border-left: 0; }
  .brand__name { font-size: 19px; }
  .quoteform { padding: var(--s5) var(--s4); }
}