/* ===== Tokens ===== */
:root {
  --navy-900: #0B1324;
  --navy-800: #0F172A;
  --navy-700: #1E293B;
  --slate-600: #475569;
  --slate-500: #64748B;
  --slate-200: #E2E8F0;
  --slate-100: #EEF2F6;
  --slate-50: #F8FAFC;
  --white: #FFFFFF;
  --accent: #C2410C;        /* cam an toàn, đủ tương phản với chữ trắng */
  --accent-hover: #9A3412;
  --accent-soft: #FFF1E8;
  --accent-light: #FB923C;  /* chỉ dùng trên nền tối */

  --font: "Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --radius-sm: 6px;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 2px rgb(15 23 42 / .06), 0 1px 3px rgb(15 23 42 / .08);
  --shadow: 0 10px 30px -12px rgb(15 23 42 / .25);
  --container: 1200px;
  --gutter: 16px;
  --ease: cubic-bezier(.2, .7, .2, 1);
}

/* ===== Base ===== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  color: var(--navy-800);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
h1, h2, h3 { line-height: 1.25; margin: 0 0 .5em; letter-spacing: -.01em; }
h2 { font-size: clamp(1.6rem, 1.2rem + 1.6vw, 2.25rem); font-weight: 700; }
h3 { font-size: 1.125rem; font-weight: 600; }
p { margin: 0 0 1em; }
ul { margin: 0; padding: 0; list-style: none; }

:focus-visible { outline: 3px solid var(--accent-light); outline-offset: 2px; border-radius: 4px; }

.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: var(--gutter); }
@media (min-width: 768px) { :root { --gutter: 24px; } }

.skip-link {
  position: absolute; left: 16px; top: -100px; z-index: 100;
  background: var(--accent); color: var(--white); padding: 10px 16px; border-radius: var(--radius-sm);
}
.skip-link:focus { top: 12px; }

.icon {
  width: 20px; height: 20px; flex: none;
  fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round;
}
.icon--sm { width: 16px; height: 16px; }

.eyebrow {
  display: inline-block; margin-bottom: .75rem;
  font-size: .8125rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase;
  color: var(--accent);
}
.eyebrow--light { color: var(--accent-light); }

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 48px; padding: 12px 24px;
  font: inherit; font-weight: 600; text-decoration: none;
  border: 2px solid transparent; border-radius: var(--radius-sm); cursor: pointer;
  transition: background-color .2s var(--ease), border-color .2s var(--ease), color .2s var(--ease);
}
.btn--primary { background: var(--accent); color: var(--white); }
.btn--primary:hover { background: var(--accent-hover); }
.btn--ghost { border-color: rgb(255 255 255 / .6); color: var(--white); }
.btn--ghost:hover { background: rgb(255 255 255 / .1); border-color: var(--white); }
.btn--sm { min-height: 44px; padding: 8px 18px; }
.btn--block { width: 100%; }

/* ===== Topbar ===== */
.topbar { background: var(--navy-900); color: #CBD5E1; font-size: .875rem; }
.topbar__inner { display: flex; justify-content: space-between; align-items: center; gap: 16px; min-height: 40px; }
.topbar__item, .topbar__links a { display: inline-flex; align-items: center; gap: 6px; }
.topbar__links { display: flex; gap: 20px; }
.topbar__links a { text-decoration: none; }
.topbar__links a:hover { color: var(--white); }
.topbar .icon { width: 16px; height: 16px; color: var(--accent-light); }
@media (max-width: 899px) { .topbar__item { display: none; } .topbar__inner { justify-content: center; } }
@media (max-width: 420px) { .topbar__links a:last-child { display: none; } }

/* ===== Header / Nav ===== */
.header {
  position: sticky; top: 0; z-index: 50;
  background: rgb(255 255 255 / .96); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--slate-200);
}
.header__inner { display: flex; align-items: center; justify-content: space-between; min-height: 72px; gap: 24px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.brand img { height: 36px; width: auto; }
.brand__text { display: flex; flex-direction: column; line-height: 1.2; white-space: nowrap; }
@media (max-width: 399px) { .brand__text small { display: none; } .brand img { height: 32px; } }
.brand__text strong { font-size: 1.125rem; font-weight: 800; color: var(--navy-800); }
.brand__text small { font-size: .75rem; color: var(--slate-600); }

.nav__list { display: flex; align-items: center; gap: 4px; }
.nav__list > li > a {
  display: inline-flex; align-items: center; gap: 4px;
  min-height: 44px; padding: 8px 14px; border-radius: var(--radius-sm);
  font-size: .9375rem; font-weight: 500; text-decoration: none; color: var(--navy-700);
  transition: color .2s var(--ease), background-color .2s var(--ease);
}
.nav__list > li > a:not(.btn):hover { color: var(--accent); background: var(--accent-soft); }
.nav__list > li > a[aria-current="page"] { color: var(--accent); }
.nav__list > li > a.btn { color: var(--white); margin-left: 8px; }

.nav__has-sub { position: relative; }
.nav__sub {
  position: absolute; top: calc(100% + 8px); left: 0; min-width: 300px;
  padding: 8px; background: var(--white); border: 1px solid var(--slate-200);
  border-radius: var(--radius); box-shadow: var(--shadow);
  opacity: 0; visibility: hidden; transform: translateY(-4px);
  transition: opacity .2s var(--ease), transform .2s var(--ease), visibility .2s;
}
.nav__has-sub:hover .nav__sub,
.nav__has-sub:focus-within .nav__sub { opacity: 1; visibility: visible; transform: none; }
.nav__sub a {
  display: block; padding: 10px 12px; border-radius: var(--radius-sm);
  font-size: .9375rem; text-decoration: none; color: var(--navy-700);
}
.nav__sub a:hover { background: var(--slate-100); color: var(--accent); }

/* Mobile menu (CSS-only) */
.nav-toggle { position: absolute; opacity: 0; width: 1px; height: 1px; }
.nav-toggle__btn { display: none; }

@media (max-width: 1023px) {
  .nav-toggle__btn {
    display: flex; flex-direction: column; justify-content: center; gap: 5px;
    width: 44px; height: 44px; padding: 10px; cursor: pointer; border-radius: var(--radius-sm);
  }
  .nav-toggle__btn span { height: 2px; background: var(--navy-800); border-radius: 2px; transition: transform .25s var(--ease), opacity .2s; }
  .nav-toggle:focus-visible + .nav-toggle__btn { outline: 3px solid var(--accent-light); }
  .nav-toggle:checked + .nav-toggle__btn span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle:checked + .nav-toggle__btn span:nth-child(2) { opacity: 0; }
  .nav-toggle:checked + .nav-toggle__btn span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  .nav {
    position: absolute; top: 100%; left: 0; right: 0;
    background: var(--white); border-bottom: 1px solid var(--slate-200); box-shadow: var(--shadow);
    max-height: 0; overflow: hidden; transition: max-height .3s var(--ease);
  }
  .nav-toggle:checked ~ .nav { max-height: 80vh; overflow-y: auto; }
  .nav__list { flex-direction: column; align-items: stretch; padding: 8px var(--gutter) 16px; gap: 0; }
  .nav__list > li > a { width: 100%; padding: 12px; }
  .nav__list > li > a.btn { margin: 8px 0 0; }
  .nav__sub {
    position: static; min-width: 0; opacity: 1; visibility: visible; transform: none;
    border: 0; box-shadow: none; padding: 0 0 0 12px; border-left: 2px solid var(--slate-200); margin-left: 12px;
  }
  .nav__has-sub > a .icon { display: none; }
}

/* ===== Hero ===== */
.hero {
  position: relative; color: var(--white);
  background:
    linear-gradient(100deg, rgb(11 19 36 / .94) 0%, rgb(11 19 36 / .8) 45%, rgb(11 19 36 / .35) 100%),
    url("assets/img/chung/chung-01.jpg") center 35% / cover no-repeat;
}
.hero__inner { min-height: clamp(480px, 72vh, 640px); display: flex; align-items: center; padding-block: 72px; }
.hero__content { max-width: 760px; }
.hero h1 { font-size: clamp(2rem, 1.3rem + 3vw, 3.25rem); font-weight: 800; margin-bottom: 20px; }
.hero h1 span { display: block; color: var(--accent-light); }
.hero__lead { font-size: 1.125rem; color: #CBD5E1; max-width: 56ch; margin-bottom: 32px; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 12px; }

/* ===== Stats ===== */
.stats { position: relative; z-index: 2; margin-top: -48px; }
.stats__grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  background: var(--white); border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 0;
}
.stat { padding: 28px 24px; text-align: center; border-right: 1px solid var(--slate-200); }
.stat:last-child { border-right: 0; }
.stat strong { display: block; font-size: 2rem; font-weight: 800; color: var(--accent); line-height: 1.1; }
.stat span { font-size: .9375rem; color: var(--slate-600); }
@media (max-width: 767px) {
  .stats__grid { grid-template-columns: repeat(2, 1fr); margin-inline: var(--gutter); width: auto; }
  .stat:nth-child(2) { border-right: 0; }
  .stat:nth-child(-n+2) { border-bottom: 1px solid var(--slate-200); }
  .stat { padding: 20px 12px; }
}

/* ===== Sections ===== */
.section { padding-block: clamp(64px, 8vw, 104px); }
.section--muted { background: var(--slate-50); }
.section__head { max-width: 680px; margin: 0 auto 48px; text-align: center; }
.section__head p:last-child { color: var(--slate-600); font-size: 1.0625rem; }
.section__head--row {
  max-width: none; display: flex; justify-content: space-between; align-items: flex-end; gap: 16px; text-align: left;
}
.section__head--row h2 { margin: 0; }

.link-arrow {
  display: inline-flex; align-items: center; gap: 6px; min-height: 44px;
  font-weight: 600; color: var(--accent); text-decoration: none;
}
.link-arrow:hover { text-decoration: underline; text-underline-offset: 4px; }

/* ===== Services ===== */
.services { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 24px; }
.service {
  display: flex; flex-direction: column;
  padding: 32px 28px; background: var(--white);
  border: 1px solid var(--slate-200); border-radius: var(--radius);
  text-decoration: none; color: inherit;
  transition: border-color .2s var(--ease), box-shadow .2s var(--ease);
}
.service:hover { border-color: var(--accent); box-shadow: var(--shadow); }
.service__icon {
  display: grid; place-items: center; width: 56px; height: 56px; margin-bottom: 20px;
  border-radius: var(--radius); background: var(--accent-soft); color: var(--accent);
}
.service__icon .icon { width: 28px; height: 28px; }
.service p { color: var(--slate-600); font-size: .9375rem; flex: 1; }
.service__more { display: inline-flex; align-items: center; gap: 6px; font-weight: 600; color: var(--accent); }
.service:hover .service__more .icon { transform: translateX(3px); }
.service__more .icon { transition: transform .2s var(--ease); }

/* ===== About ===== */
.about { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(32px, 5vw, 72px); align-items: center; }
.about__media { position: relative; }
.about__media img { width: 100%; aspect-ratio: 4 / 5; object-fit: cover; border-radius: var(--radius-lg); }
.about__badge {
  position: absolute; right: -16px; bottom: 32px; max-width: 240px;
  padding: 20px 24px; background: var(--navy-800); color: var(--white);
  border-radius: var(--radius); box-shadow: var(--shadow);
}
.about__badge strong { display: block; font-size: 1.5rem; color: var(--accent-light); }
.about__badge span { font-size: .875rem; color: #CBD5E1; }
.about__content p { color: var(--slate-600); }
.checklist { display: grid; gap: 12px; margin-top: 24px; }
.checklist li { position: relative; padding-left: 32px; font-weight: 500; }
.checklist li::before {
  content: ""; position: absolute; left: 0; top: 3px; width: 20px; height: 20px; border-radius: 50%;
  background: var(--accent) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m5 12 5 5 9-10'/%3E%3C/svg%3E") center / 12px no-repeat;
}
@media (max-width: 899px) {
  .about { grid-template-columns: 1fr; }
  .about__media img { aspect-ratio: 16 / 10; }
  .about__badge { right: 16px; bottom: 16px; }
}

.about__content .link-arrow { margin-top: 20px; }
.partners__list { display: flex; flex-wrap: wrap; gap: 10px; }
.partners__list li {
  padding: 8px 16px; border: 1px solid var(--slate-200); border-radius: 999px; background: var(--white);
  font-size: .9375rem; font-weight: 600; color: var(--navy-700);
}

/* ===== Gallery ===== */
.gallery { display: grid; grid-template-columns: repeat(4, 1fr); grid-auto-rows: 240px; gap: 16px; }
.gallery__item { position: relative; margin: 0; overflow: hidden; border-radius: var(--radius); background: var(--slate-100); }
.gallery__item--wide { grid-column: span 2; }
.gallery__item img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s var(--ease); }
.gallery__item:hover img { transform: scale(1.04); }
.gallery__item span {
  position: absolute; inset: auto 0 0 0; padding: 32px 16px 14px;
  background: linear-gradient(transparent, rgb(11 19 36 / .85));
  color: var(--white); font-weight: 600; font-size: .9375rem;
}
@media (max-width: 899px) { .gallery { grid-template-columns: repeat(2, 1fr); grid-auto-rows: 200px; } }
@media (max-width: 559px) {
  .gallery { grid-template-columns: 1fr; }
  .gallery__item--wide { grid-column: auto; }
}

/* ===== News ===== */
.news { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.post {
  position: relative; padding: 28px; background: var(--white);
  border: 1px solid var(--slate-200); border-radius: var(--radius);
  transition: box-shadow .2s var(--ease), border-color .2s var(--ease);
}
.post:hover { box-shadow: var(--shadow); border-color: var(--slate-500); }
.post__meta { display: flex; align-items: center; flex-wrap: wrap; gap: 12px; margin-bottom: 12px; font-size: .875rem; color: var(--slate-600); }
.post__meta time { display: inline-flex; align-items: center; gap: 6px; }
.post__tag {
  display: inline-block; padding: 4px 10px; border-radius: 999px;
  background: var(--accent-soft); color: var(--accent-hover); font-size: .8125rem; font-weight: 600;
}
.post h3 a { text-decoration: none; }
.post h3 a::after { content: ""; position: absolute; inset: 0; border-radius: inherit; }
.post:hover h3 a { color: var(--accent); }
.post p:last-child { color: var(--slate-600); font-size: .9375rem; margin: 0; }
@media (max-width: 559px) { .section__head--row { flex-direction: column; align-items: flex-start; } }

/* ===== Page hero & breadcrumb ===== */
.page-hero {
  color: var(--white); padding-block: clamp(48px, 7vw, 88px);
  background:
    linear-gradient(100deg, rgb(11 19 36 / .95) 0%, rgb(11 19 36 / .82) 55%, rgb(11 19 36 / .6) 100%),
    var(--hero-img, none) center / cover no-repeat,
    var(--navy-800);
}
.page-hero h1 { font-size: clamp(1.75rem, 1.2rem + 2.4vw, 2.75rem); font-weight: 800; max-width: 22ch; margin: 0; }
.page-hero p { max-width: 60ch; margin: 16px 0 0; font-size: 1.0625rem; color: #CBD5E1; }
.breadcrumb ol { display: flex; flex-wrap: wrap; gap: 4px 8px; margin: 0 0 16px; padding: 0; list-style: none; font-size: .875rem; color: #94A3B8; }
.breadcrumb li + li::before { content: "/"; margin-right: 8px; color: #64748B; }
.breadcrumb a { text-decoration: none; color: #CBD5E1; }
.breadcrumb a:hover { color: var(--white); text-decoration: underline; }
.breadcrumb [aria-current] { color: var(--accent-light); max-width: 40ch; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.section--tight { padding-block: clamp(40px, 5vw, 64px); }
.muted { color: var(--slate-600); margin: 0; }
.lead { font-size: 1.125rem; color: var(--navy-700); }

/* ===== Buttons extra ===== */
.btn--outline { border-color: var(--accent); color: var(--accent); background: transparent; }
.btn--outline:hover { background: var(--accent); color: var(--white); }

/* ===== CTA band ===== */
.cta { background: var(--navy-800); color: var(--white); padding-block: clamp(48px, 6vw, 72px); }
.cta__inner { display: flex; align-items: center; justify-content: space-between; gap: 24px 48px; flex-wrap: wrap; }
.cta h2 { margin-bottom: 8px; }
.cta p { margin: 0; color: #CBD5E1; }
.cta__actions { display: flex; flex-wrap: wrap; gap: 12px; }

/* ===== Service overview rows ===== */
.service-rows { display: grid; gap: clamp(48px, 7vw, 88px); }
.service-row { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(28px, 5vw, 64px); align-items: center; }
.service-row img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; border-radius: var(--radius-lg); }
.service-row--flip img { order: 2; }
.service-row h2 { font-size: clamp(1.35rem, 1.1rem + 1vw, 1.75rem); }
.service-row p { color: var(--slate-600); margin-bottom: 24px; }
@media (max-width: 767px) {
  .service-row { grid-template-columns: 1fr; }
  .service-row--flip img { order: 0; }
}

/* ===== Detail layout (dịch vụ, bài viết) ===== */
.detail { display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: clamp(32px, 5vw, 64px); align-items: start; }
.detail__main h2 { font-size: 1.5rem; margin-top: 40px; }
.detail__main > h2:first-of-type { margin-top: 32px; }
.detail__aside { position: sticky; top: 96px; display: grid; gap: 20px; }
@media (max-width: 959px) {
  .detail { grid-template-columns: 1fr; }
  .detail__aside { position: static; }
}

.scope { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.scope__item { display: flex; gap: 16px; padding: 20px; border: 1px solid var(--slate-200); border-radius: var(--radius); }
.scope__item .service__icon { width: 48px; height: 48px; margin: 0; flex: none; }
.scope__item .service__icon .icon { width: 24px; height: 24px; }
.scope__item h3 { font-size: 1rem; margin-bottom: 4px; }
.scope__item p { margin: 0; font-size: .9375rem; color: var(--slate-600); }
@media (max-width: 639px) { .scope { grid-template-columns: 1fr; } }

.steps { counter-reset: step; display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin: 0; padding: 0; list-style: none; }
.steps li { counter-increment: step; position: relative; padding: 20px 20px 20px 68px; background: var(--slate-50); border-radius: var(--radius); }
.steps li::before {
  content: counter(step); position: absolute; left: 20px; top: 20px;
  display: grid; place-items: center; width: 32px; height: 32px; border-radius: 50%;
  background: var(--navy-800); color: var(--white); font-weight: 700; font-size: .9375rem;
}
.steps strong { display: block; }
.steps span { font-size: .9375rem; color: var(--slate-600); }
@media (max-width: 639px) { .steps { grid-template-columns: 1fr; } }

.aside-card { padding: 24px; border: 1px solid var(--slate-200); border-radius: var(--radius); background: var(--white); }
.aside-card h2 { font-size: 1.125rem; margin-bottom: 8px; }
.aside-card--dark { background: var(--navy-800); border-color: var(--navy-800); color: var(--white); display: grid; gap: 12px; }
.aside-card--dark h2 { margin: 0; }
.aside-card--dark p { margin: 0 0 4px; color: #CBD5E1; font-size: .9375rem; }
.aside-links { display: grid; gap: 4px; margin-top: 8px; }
.aside-links a {
  display: flex; align-items: center; gap: 12px; min-height: 44px; padding: 8px 10px; border-radius: var(--radius-sm);
  text-decoration: none; font-weight: 500; color: var(--navy-700);
}
.aside-links a:hover { background: var(--accent-soft); color: var(--accent); }
.aside-links .icon { color: var(--accent); }

/* ===== Prose (bài viết) ===== */
.prose { font-size: 1.0625rem; line-height: 1.75; color: var(--navy-700); max-width: 72ch; }
.prose h2 { font-size: 1.375rem; margin: 2em 0 .6em; color: var(--navy-800); }
.prose h3 { font-size: 1.125rem; margin: 1.6em 0 .5em; }
.prose ul { list-style: disc; padding-left: 1.4em; margin: 0 0 1.2em; display: grid; gap: .5em; }
.prose li::marker { color: var(--accent); }
.prose img { border-radius: var(--radius); margin: 1.5em 0; }
.prose em { color: var(--slate-600); }
.about__content.prose { max-width: none; font-size: 1rem; }

/* ===== Masonry gallery + lightbox ===== */
.masonry { columns: 4 220px; column-gap: 12px; }
.masonry__item { display: block; margin-bottom: 12px; break-inside: avoid; border-radius: var(--radius-sm); overflow: hidden; background: var(--slate-100); }
.masonry__item img { width: 100%; height: auto; transition: transform .4s var(--ease), opacity .2s; }
.masonry__item:hover img { transform: scale(1.03); }
.masonry__item:focus-visible { outline-offset: 3px; }
@media (max-width: 559px) { .masonry { columns: 2 140px; column-gap: 8px; } .masonry__item { margin-bottom: 8px; } }

.lightbox {
  width: 100vw; height: 100dvh; max-width: none; max-height: none; margin: 0; padding: 0; border: 0;
  background: rgb(11 19 36 / .94); color: var(--white);
}
.lightbox::backdrop { background: transparent; }
.lightbox[open] { display: grid; place-items: center; }
.lightbox__figure { margin: 0; display: grid; justify-items: center; gap: 12px; }
.lightbox__figure img { max-width: calc(100vw - 32px); max-height: calc(100dvh - 120px); object-fit: contain; border-radius: var(--radius-sm); }
.lightbox__figure figcaption { font-size: .875rem; color: #CBD5E1; }
.lightbox__btn {
  position: fixed; display: grid; place-items: center; width: 48px; height: 48px;
  border: 0; border-radius: 50%; cursor: pointer; color: var(--white); background: rgb(255 255 255 / .12);
  transition: background-color .2s var(--ease);
}
.lightbox__btn:hover { background: rgb(255 255 255 / .24); }
.lightbox__close { top: 16px; right: 16px; }
.lightbox__prev { left: 16px; top: 50%; translate: 0 -50%; }
.lightbox__next { right: 16px; top: 50%; translate: 0 -50%; }
@media (max-width: 559px) { .lightbox__prev, .lightbox__next { top: auto; bottom: 16px; translate: none; } }

/* ===== Công trình ===== */
.tabs {
  position: sticky; top: 72px; z-index: 5; display: flex; gap: 8px; flex-wrap: wrap;
  padding-block: 12px; margin-bottom: 32px; background: rgb(255 255 255 / .96);
}
.tabs a {
  display: inline-flex; align-items: center; gap: 8px; min-height: 44px; padding: 8px 18px;
  border: 1px solid var(--slate-200); border-radius: 999px; text-decoration: none; font-weight: 600; color: var(--navy-700);
}
.tabs a:hover { border-color: var(--accent); color: var(--accent); }
.tabs span { padding: 0 8px; border-radius: 999px; background: var(--slate-100); font-size: .8125rem; color: var(--slate-600); }
.project-group + .project-group { margin-top: 72px; }
.project-group { scroll-margin-top: 150px; }
.project-group .section__head { margin-bottom: 24px; }

/* ===== Giới thiệu ===== */
.timeline { position: relative; display: grid; gap: 24px; max-width: 760px; margin: 0 auto; padding: 0; list-style: none; }
.timeline::before { content: ""; position: absolute; left: 39px; top: 8px; bottom: 8px; width: 2px; background: var(--slate-200); }
.timeline li { position: relative; display: grid; grid-template-columns: 80px 1fr; gap: 24px; align-items: start; }
.timeline__year {
  position: relative; z-index: 1; display: grid; place-items: center; width: 80px; height: 40px;
  border-radius: 999px; background: var(--accent); color: var(--white); font-weight: 700;
}
.timeline li div { padding: 16px 20px; background: var(--white); border: 1px solid var(--slate-200); border-radius: var(--radius); }
.timeline h3 { margin-bottom: 4px; }
.timeline p { margin: 0; color: var(--slate-600); font-size: .9375rem; }

.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 24px; }
.feature { padding: 28px; border-radius: var(--radius); background: var(--slate-50); }
.feature > .icon { width: 44px; height: 44px; padding: 10px; margin-bottom: 16px; border-radius: var(--radius-sm); background: var(--accent-soft); color: var(--accent); }
.feature p { margin: 0; color: var(--slate-600); font-size: .9375rem; }

.partner-groups { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; }
.partner-group { padding: 24px; background: var(--white); border: 1px solid var(--slate-200); border-radius: var(--radius); }
.partner-group h3 { font-size: .875rem; text-transform: uppercase; letter-spacing: .06em; color: var(--slate-600); margin-bottom: 14px; }
.partner-group .partners__list li { background: var(--slate-50); }

/* ===== Liên hệ ===== */
.contact-cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 48px; }
.contact-card { display: flex; gap: 14px; padding: 20px; border: 1px solid var(--slate-200); border-radius: var(--radius); }
.contact-card > .icon { width: 44px; height: 44px; padding: 11px; flex: none; border-radius: var(--radius-sm); background: var(--accent-soft); color: var(--accent); }
.contact-card h2 { font-size: .8125rem; text-transform: uppercase; letter-spacing: .06em; color: var(--slate-600); margin-bottom: 4px; }
.contact-card p { margin: 0; font-weight: 500; font-size: .9375rem; }
.contact-card a { text-decoration: none; font-weight: 700; color: var(--accent); }
.contact-card a:hover { text-decoration: underline; }
@media (max-width: 1023px) { .contact-cards { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 559px) { .contact-cards { grid-template-columns: 1fr; } }

.contact-page__grid { display: grid; grid-template-columns: 400px 1fr; gap: 32px; align-items: stretch; }
.contact-quick { align-content: start; padding: clamp(24px, 4vw, 36px); border-radius: var(--radius-lg); }
.contact-quick h2 { font-size: 1.375rem; }
.contact-quick__list { display: grid; gap: 4px; margin-top: 12px; padding-top: 16px; border-top: 1px solid rgb(255 255 255 / .12); }
.contact-quick__list a {
  display: flex; align-items: center; gap: 12px; min-height: 44px; padding: 8px 10px;
  border-radius: var(--radius-sm); text-decoration: none; color: #E2E8F0;
}
.contact-quick__list a:hover { background: rgb(255 255 255 / .08); color: var(--white); }
.contact-quick__list .icon { color: var(--accent-light); }
.map { min-height: 420px; border-radius: var(--radius-lg); overflow: hidden; background: var(--slate-100); }
.map iframe { width: 100%; height: 100%; min-height: 420px; border: 0; display: block; }
@media (max-width: 899px) { .contact-page__grid { grid-template-columns: 1fr; } }

/* ===== 404 ===== */
.empty { text-align: center; }
.empty h1 { font-size: clamp(2rem, 1.4rem + 2vw, 3rem); }
.empty p { color: var(--slate-600); }

/* ===== Footer ===== */
.footer { background: var(--navy-900); color: #94A3B8; font-size: .9375rem; padding-top: 64px; }
.footer__grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 32px; padding-bottom: 48px; }
.footer__brand { font-size: 1.125rem; font-weight: 700; color: var(--white); }
.footer__title { font-weight: 600; color: var(--white); margin-bottom: 12px; }
.footer ul { display: grid; gap: 4px; }
.footer a { display: inline-block; padding-block: 6px; text-decoration: none; }
.footer a:hover { color: var(--white); }
.footer__contact li { display: flex; gap: 10px; align-items: flex-start; }
.footer__contact .icon { width: 18px; height: 18px; margin-top: 8px; color: var(--accent-light); }
.footer__contact span { padding-block: 6px; }
.footer__bottom { border-top: 1px solid rgb(255 255 255 / .08); padding-block: 20px; font-size: .875rem; }
.footer__bottom p { margin: 0; }
@media (max-width: 899px) { .footer__grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 559px) { .footer__grid { grid-template-columns: 1fr; } }

/* ===== Reduced motion ===== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}