:root {
  --ink: #17212a;
  --navy: #2a0b16;
  --navy-soft: #76002c;
  --paper: #f1ede3;
  --paper-deep: #e5ded0;
  --white: #fff;
  --copper: #a4073c;
  --copper-bright: #e4b6c5;
  --red: #a4073c;
  --red-deep: #7d002d;
  --line: rgba(164, 7, 60, 0.42);
  --muted: #6a6a63;
  --max-width: 1440px;
  --header-height: 96px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  overflow-x: hidden;
  color: var(--ink);
  background: var(--paper);
  font-family: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 100;
  padding: 10px 14px;
  color: var(--white);
  background: var(--navy);
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.site-header {
  position: relative;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
  padding: 0 clamp(24px, 6vw, 92px);
  background: rgba(255, 255, 255, 0.97);
  border-bottom: 1px solid rgba(23, 33, 42, 0.09);
}

.brand,
.footer-brand {
  display: flex;
  align-items: center;
  gap: 17px;
}

.brand-mark {
  position: relative;
  display: grid;
  width: 54px;
  height: 54px;
  place-items: center;
  color: var(--white);
  background: var(--red);
  overflow: hidden;
}

.brand-mark::after {
  position: absolute;
  right: -16px;
  bottom: -16px;
  width: 38px;
  height: 38px;
  content: "";
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: 50%;
}

.brand-mark span {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 17px;
  letter-spacing: 0.06em;
}

.brand-name {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 20px;
  letter-spacing: 0.015em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(22px, 3vw, 46px);
}

.site-nav a,
.language-toggle {
  position: relative;
  padding: 12px 0;
  color: #4c5155;
  background: transparent;
  border: 0;
  font: inherit;
  font-size: 14px;
  cursor: pointer;
}

.site-nav a::after {
  position: absolute;
  right: 0;
  bottom: 4px;
  left: 0;
  height: 1px;
  content: "";
  background: var(--copper);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 220ms ease;
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  transform: scaleX(1);
  transform-origin: left;
}

.language-toggle {
  min-width: 48px;
  padding: 9px 12px;
  color: var(--red);
  border: 1px solid rgba(164, 7, 60, 0.26);
}

.menu-toggle {
  display: none;
}

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  min-height: min(720px, calc(100vh - var(--header-height)));
  color: var(--white);
  background: var(--red);
  overflow: hidden;
}

.hero-content {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  justify-content: center;
  width: 100%;
  min-width: 0;
  min-height: inherit;
  margin: 0;
  padding: clamp(70px, 8vw, 120px) clamp(34px, 7vw, 110px);
  background:
    radial-gradient(circle at 22% 14%, rgba(255, 255, 255, 0.08), transparent 26%),
    linear-gradient(145deg, #ad0a43, #930034 74%);
}

.hero-content::after {
  position: absolute;
  right: 0;
  bottom: 0;
  width: 55%;
  height: 1px;
  content: "";
  background: rgba(255, 255, 255, 0.45);
}

.hero-image {
  position: relative;
  min-height: inherit;
  background:
    linear-gradient(90deg, rgba(89, 0, 31, 0.12), transparent 24%),
    url("assets/hong-kong-hero-v2.png") center center / cover no-repeat;
}

.hero-image::before {
  position: absolute;
  inset: 0;
  content: "";
  box-shadow: inset 16px 0 32px rgba(64, 0, 22, 0.13);
}

.eyebrow,
.section-index,
.card-number,
.footer-heading {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.eyebrow {
  margin: 0 0 26px;
  color: rgba(255, 255, 255, 0.78);
}

.hero h1 {
  max-width: 680px;
  margin: 0;
  font-family: Georgia, "Times New Roman", "Songti SC", serif;
  font-size: clamp(58px, 6.4vw, 102px);
  font-weight: 400;
  line-height: 0.96;
  letter-spacing: -0.045em;
}

.hero-intro {
  max-width: 540px;
  margin: 34px 0 0;
  color: rgba(255, 255, 255, 0.82);
  font-family: Georgia, "Times New Roman", "Songti SC", serif;
  font-size: clamp(18px, 2vw, 25px);
  line-height: 1.5;
}

.hero-button {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  width: 210px;
  margin-top: 52px;
  padding: 16px 20px;
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: 999px;
  transition: color 200ms ease, background-color 200ms ease;
}

.hero-button:hover,
.hero-button:focus-visible {
  color: var(--red);
  background: var(--white);
}

.scroll-cue {
  position: absolute;
  right: 28px;
  bottom: 32px;
  z-index: 3;
  width: 34px;
  height: 50px;
  border: 1px solid rgba(255, 255, 255, 0.32);
  border-radius: 22px;
}

.scroll-cue span {
  position: absolute;
  top: 10px;
  left: 15px;
  width: 2px;
  height: 9px;
  background: var(--copper-bright);
  animation: scroll-cue 1.8s ease infinite;
}

@keyframes scroll-cue {
  0% { transform: translateY(0); opacity: 0; }
  30% { opacity: 1; }
  80% { opacity: 1; }
  100% { transform: translateY(19px); opacity: 0; }
}

.overview-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  max-width: var(--max-width);
  margin: 0 auto;
  border-right: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.overview-lead {
  padding: clamp(56px, 7vw, 110px) clamp(30px, 6vw, 90px);
  border-right: 1px solid var(--line);
}

.section-index {
  margin: 0 0 34px;
  color: var(--copper);
}

.overview-lead h2,
.contact-section h2 {
  margin: 0;
  font-family: Georgia, "Times New Roman", "Songti SC", serif;
  font-size: clamp(44px, 5.2vw, 78px);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -0.04em;
}

.overview-lead h2 {
  color: var(--red);
}

.lead-copy {
  max-width: 600px;
  margin: 40px 0 0;
  color: #434844;
  font-size: 17px;
  line-height: 1.75;
}

.approach-photo {
  min-height: 560px;
  margin-top: 72px;
  background:
    linear-gradient(180deg, rgba(85, 0, 29, 0.04), rgba(85, 0, 29, 0.15)),
    url("assets/approach-architecture-v1.png") center center / cover no-repeat;
}

.principle-stack {
  display: flex;
  flex-direction: column;
}

.principle-card {
  position: relative;
  flex: 1;
  min-height: 420px;
  padding: clamp(50px, 6vw, 88px) clamp(32px, 6vw, 92px);
  border-bottom: 1px solid var(--line);
  transition: background-color 240ms ease, color 240ms ease;
}

.principle-card:last-child {
  border-bottom: 0;
}

.principle-card:hover {
  color: var(--white);
  background: var(--red);
}

.card-number {
  position: absolute;
  top: 34px;
  right: 36px;
  margin: 0;
  color: var(--copper);
}

.principle-card h3 {
  max-width: 530px;
  margin: 0;
  color: var(--copper);
  font-family: Georgia, "Times New Roman", "Songti SC", serif;
  font-size: clamp(36px, 4vw, 58px);
  font-weight: 400;
  line-height: 1.06;
  letter-spacing: -0.025em;
}

.principle-card:hover h3,
.principle-card:hover .card-number {
  color: var(--copper-bright);
}

.card-kicker {
  margin: 34px 0 24px;
  font-weight: 600;
  line-height: 1.5;
}

.principle-card ul {
  max-width: 620px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.principle-card li {
  position: relative;
  margin: 12px 0;
  padding-left: 18px;
  color: #565a56;
  font-size: 15px;
  line-height: 1.55;
}

.principle-card:hover li {
  color: rgba(255, 255, 255, 0.72);
}

.principle-card li::before {
  position: absolute;
  top: 0.63em;
  left: 0;
  width: 5px;
  height: 5px;
  content: "";
  background: var(--copper);
  border-radius: 50%;
}

.contact-section {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: clamp(48px, 10vw, 160px);
  padding: clamp(80px, 10vw, 150px) max(24px, calc((100vw - 1260px) / 2));
  color: var(--white);
  background: var(--red-deep);
}

.section-index.light {
  color: var(--copper-bright);
}

.contact-copy {
  align-self: end;
}

.contact-copy p {
  max-width: 510px;
  margin: 0 0 34px;
  color: rgba(255, 255, 255, 0.7);
  font-size: 16px;
  line-height: 1.7;
}

.outline-button {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  min-width: 220px;
  padding: 16px 19px;
  border: 1px solid rgba(255, 255, 255, 0.52);
  transition: color 200ms ease, background-color 200ms ease;
}

.outline-button:hover,
.outline-button:focus-visible {
  color: var(--red);
  background: var(--white);
}

.site-footer {
  padding: 70px max(24px, calc((100vw - 1260px) / 2)) 34px;
  color: rgba(255, 255, 255, 0.76);
  background: #a4073c;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.6fr 0.8fr 0.8fr;
  gap: 50px;
  padding-bottom: 72px;
}

.brand-mark-light {
  color: var(--red);
  background: var(--paper);
}

.footer-brand p {
  color: var(--white);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 18px;
}

.footer-heading {
  margin: 0 0 19px;
  color: var(--white);
}

.footer-top > div:not(.footer-brand) {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 11px;
  font-size: 14px;
}

.footer-top > div:not(.footer-brand) p {
  margin: 0;
}

.footer-top a:hover {
  color: var(--white);
}

.footer-legal {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 50px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.38);
  font-size: 11px;
  line-height: 1.6;
}

.footer-legal p {
  margin: 0;
}

@media (max-width: 900px) {
  :root { --header-height: 78px; }

  .site-header {
    padding: 0 22px;
  }

  .brand-mark {
    width: 45px;
    height: 45px;
  }

  .brand-name {
    font-size: 17px;
  }

  .menu-toggle {
    display: flex;
    width: 42px;
    height: 42px;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 7px;
    background: transparent;
    border: 0;
  }

  .menu-toggle span:not(.sr-only) {
    width: 24px;
    height: 1px;
    background: var(--ink);
    transition: transform 200ms ease;
  }

  .menu-toggle[aria-expanded="true"] span:first-child {
    transform: translateY(4px) rotate(45deg);
  }

  .menu-toggle[aria-expanded="true"] span:nth-child(2) {
    transform: translateY(-4px) rotate(-45deg);
  }

  .site-nav {
    position: absolute;
    top: 100%;
    right: 0;
    left: 0;
    display: none;
    align-items: stretch;
    padding: 24px;
    background: var(--white);
    border-top: 1px solid rgba(23, 33, 42, 0.09);
  }

  .site-nav.is-open {
    display: flex;
    flex-direction: column;
    gap: 4px;
  }

  .site-nav a {
    padding: 12px 0;
  }

  .language-toggle {
    align-self: flex-start;
    margin-top: 12px;
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .hero-content {
    min-height: 560px;
  }

  .hero-image {
    min-height: 460px;
  }

  .overview-section,
  .contact-section {
    grid-template-columns: 1fr;
  }

  .overview-section {
    border: 0;
  }

  .overview-lead {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .approach-photo {
    min-height: 430px;
  }

  .principle-card {
    min-height: auto;
  }

  .contact-copy {
    align-self: auto;
  }

  .footer-top {
    grid-template-columns: 1fr 1fr;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 560px) {
  .brand-name {
    max-width: 132px;
    line-height: 1.1;
  }

  .hero-content {
    width: 100vw;
    max-width: 100vw;
    padding-right: 24px;
    padding-left: 24px;
  }

  .hero h1 {
    font-size: clamp(48px, 14vw, 58px);
    line-height: 1;
  }

  .hero-intro {
    width: calc(100vw - 48px);
    max-width: calc(100vw - 48px);
    font-size: 19px;
    overflow-wrap: anywhere;
  }

  .overview-lead,
  .principle-card {
    padding-right: 24px;
    padding-left: 24px;
  }

  .approach-photo {
    min-height: 360px;
    margin-top: 52px;
  }

  .contact-section {
    padding-right: 24px;
    padding-left: 24px;
  }

  .footer-top,
  .footer-legal {
    grid-template-columns: 1fr;
  }

  .site-footer {
    padding-right: 24px;
    padding-left: 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}