:root {
  --ink: #12263a;
  --ink-soft: #20384f;
  --paper: #f5f4ef;
  --paper-deep: #ece8df;
  --surface: #ffffff;
  --line: rgba(18, 38, 58, 0.12);
  --accent: #b8893d;
  --accent-soft: #d5b57f;
  --copy: #314456;
  --muted: #6b7b89;
  --shadow: 0 22px 48px rgba(18, 38, 58, 0.08);
  --font-sans: "Source Sans 3", "Noto Sans SC", sans-serif;
  --font-serif: "Cormorant Garamond", "Noto Serif SC", serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 6.5rem;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  background:
    linear-gradient(180deg, #fbfaf6 0%, var(--paper) 22%, #f7f5ef 100%);
  color: var(--copy);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body[data-lang="zh"] .lang-en,
body[data-lang="en"] .lang-zh {
  display: none !important;
}

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

button,
input,
textarea,
select {
  font: inherit;
}

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

.container {
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  backdrop-filter: blur(14px);
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 10px 28px rgba(18, 38, 58, 0.05);
}

.topline {
  border-bottom: 1px solid var(--line);
  background: linear-gradient(90deg, #11283d, #1a3045 60%, #24384a 100%);
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.8);
}

.topline .container {
  padding: 0.65rem 0;
}

.nav-wrap {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 5.25rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.9rem;
  min-width: 0;
  padding: 0.6rem 0.95rem 0.6rem 0.6rem;
  border: 1px solid rgba(18, 38, 58, 0.12);
  border-radius: 0.5rem;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 10px 26px rgba(18, 38, 58, 0.06);
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease,
    border-color 0.2s ease;
}

.brand:hover,
.brand:focus-visible {
  transform: translateY(-1px);
  border-color: rgba(184, 137, 61, 0.36);
  box-shadow: 0 14px 30px rgba(18, 38, 58, 0.09);
}

.brand-mark {
  width: 3.2rem;
  height: 3.2rem;
  display: grid;
  align-content: center;
  gap: 0.28rem;
  padding: 0.7rem;
  border-radius: 0.35rem;
  background:
    linear-gradient(180deg, rgba(184, 137, 61, 0.12), rgba(18, 38, 58, 0.04)),
    #f7f3eb;
  border: 1px solid rgba(18, 38, 58, 0.12);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.65);
}

.brand-mark span {
  display: block;
  height: 0.22rem;
  background: var(--ink);
}

.brand-mark .broken {
  position: relative;
  background: transparent;
}

.brand-mark .broken::before,
.brand-mark .broken::after {
  content: "";
  position: absolute;
  top: 0;
  width: 40%;
  height: 100%;
  background: var(--ink);
}

.brand-mark .broken::after {
  right: 0;
}

.brand-copy {
  min-width: 0;
}

.brand-title {
  display: block;
  font-family: var(--font-serif);
  line-height: 1.05;
  color: var(--ink);
}

.brand-title.lang-zh {
  font-size: clamp(1.35rem, 2vw, 1.72rem);
  letter-spacing: 0.12em;
}

.brand-title.lang-en {
  font-size: clamp(0.94rem, 1.22vw, 1.12rem);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.nav-panel {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.15rem;
}

.nav-links > a,
.nav-parent {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.55rem 0;
  color: var(--copy);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav-parent {
  background: transparent;
  border: 0;
  cursor: pointer;
}

.nav-links > a::after,
.nav-parent::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.2rem;
  width: 100%;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

.nav-links > a:hover::after,
.nav-links > a:focus-visible::after,
.nav-group:hover > .nav-parent::after,
.nav-group:focus-within > .nav-parent::after,
.nav-group.open > .nav-parent::after,
.nav-links > a.is-current::after,
.nav-parent.is-current::after {
  transform: scaleX(1);
}

.nav-links > a.is-current,
.nav-parent.is-current,
.nav-submenu a.is-current {
  color: var(--accent);
}

.nav-group {
  position: relative;
  display: inline-flex;
  align-items: center;
}

.nav-group::after {
  content: "";
  position: absolute;
  left: -1rem;
  right: -1rem;
  top: 100%;
  height: 1rem;
}

.nav-caret {
  width: 0.58rem;
  height: 0.58rem;
  margin-top: -0.12rem;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg);
  transition: transform 0.2s ease;
}

.nav-group:hover .nav-caret,
.nav-group:focus-within .nav-caret,
.nav-group.open .nav-caret {
  transform: rotate(225deg);
}

.nav-submenu {
  position: absolute;
  top: calc(100% + 0.32rem);
  left: -1rem;
  min-width: 17.5rem;
  padding: 0.75rem;
  display: grid;
  gap: 0.15rem;
  border-radius: 0.55rem;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.99);
  box-shadow:
    0 22px 44px rgba(18, 38, 58, 0.1),
    0 0 0 1px rgba(18, 38, 58, 0.02);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(0.35rem);
  transition:
    opacity 0.2s ease,
    transform 0.2s ease,
    visibility 0.2s ease;
}

.nav-submenu::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: -0.75rem;
  height: 0.75rem;
}

.nav-submenu a {
  padding: 0.88rem 0.95rem;
  border-radius: 0.38rem;
  font-size: 0.86rem;
  line-height: 1.3;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: none;
}

.nav-submenu a + a {
  border-top: 1px solid rgba(17, 26, 32, 0.06);
}

.nav-submenu a:hover,
.nav-submenu a:focus-visible {
  background: rgba(17, 26, 32, 0.045);
}

.nav-group:hover .nav-submenu,
.nav-group:focus-within .nav-submenu,
.nav-group.open .nav-submenu {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0);
}

.lang-switch,
.menu-toggle,
.button {
  border: 1px solid transparent;
  cursor: pointer;
  transition:
    transform 0.2s ease,
    background-color 0.2s ease,
    border-color 0.2s ease,
    color 0.2s ease,
    box-shadow 0.2s ease;
}

.lang-switch,
.menu-toggle {
  background: var(--surface);
  color: var(--ink);
  border-color: rgba(17, 26, 32, 0.12);
  border-radius: 0.4rem;
  padding: 0.68rem 1rem;
  font-size: 0.92rem;
}

.lang-switch:hover,
.menu-toggle:hover {
  transform: translateY(-1px);
  border-color: rgba(159, 106, 52, 0.36);
}

.menu-toggle {
  display: none;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
}

.nav-cta {
  padding: 0.82rem 1.2rem;
  border-radius: 0.42rem;
  background: var(--accent);
  color: #fffdfa;
  box-shadow: 0 12px 26px rgba(184, 137, 61, 0.18);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.nav-cta:hover,
.nav-cta:focus-visible {
  transform: translateY(-1px);
}

.page-main {
  min-height: 100vh;
}

.page-hero {
  position: relative;
  overflow: hidden;
  padding: 4.25rem 0 3rem;
  color: rgba(255, 250, 242, 0.9);
  background:
    radial-gradient(circle at 14% 18%, rgba(184, 137, 61, 0.2), transparent 24%),
    radial-gradient(circle at 82% 18%, rgba(213, 181, 127, 0.12), transparent 28%),
    linear-gradient(140deg, #11283d 0%, #17324a 58%, #22384b 100%);
}

.page-hero::before,
.page-hero::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.08);
  pointer-events: none;
}

.page-hero::before {
  width: 34rem;
  height: 34rem;
  right: -10rem;
  top: -8rem;
}

.page-hero::after {
  width: 20rem;
  height: 20rem;
  left: -6rem;
  bottom: -8rem;
}

.breadcrumb {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  margin-bottom: 1.1rem;
  color: rgba(255, 250, 242, 0.66);
  font-size: 0.9rem;
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: #fffaf2;
}

.page-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  margin-bottom: 0.85rem;
  color: var(--accent-soft);
  font-size: 0.82rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.page-kicker::before {
  content: "";
  width: 3rem;
  height: 1px;
  background: currentColor;
}

.page-title {
  max-width: 12ch;
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(3.1rem, 5vw, 5rem);
  line-height: 0.92;
  color: #fffaf2;
}

.page-lead {
  max-width: 44rem;
  margin: 1.15rem 0 0;
  font-size: 1.08rem;
  color: rgba(255, 250, 242, 0.74);
}

.hero-meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

.hero-meta-card,
.content-card,
.callout-card,
.timeline-item {
  border-radius: 0.55rem;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.96);
  box-shadow: var(--shadow);
}

.hero-meta-card {
  padding: 1rem 1.05rem;
  color: var(--copy);
}

.hero-meta-card strong {
  display: block;
  margin-bottom: 0.35rem;
  color: var(--ink);
}

.page-section {
  padding: 2.9rem 0;
}

.page-section.soft {
  background: linear-gradient(180deg, rgba(18, 38, 58, 0.02), rgba(18, 38, 58, 0.03));
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.8rem;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  margin-bottom: 0.6rem;
  color: var(--accent);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.section-tag::before {
  content: "";
  width: 3rem;
  height: 1px;
  background: currentColor;
}

.section-title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(2.25rem, 4vw, 3.75rem);
  line-height: 0.94;
  color: var(--ink);
}

.section-copy {
  max-width: 38rem;
  margin: 0;
  color: var(--muted);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.card-grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.content-card {
  padding: 1.35rem;
}

.content-card h3 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 1.72rem;
  line-height: 1.02;
  color: var(--ink);
}

.content-card p {
  margin: 0.72rem 0 0;
}

.mini-label {
  display: inline-flex;
  margin-bottom: 0.55rem;
  color: var(--accent);
  font-size: 0.78rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.split-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.06fr) minmax(280px, 0.94fr);
  gap: 1rem;
  align-items: start;
}

.detail-list {
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.8rem;
}

.detail-list li {
  position: relative;
  padding-left: 1rem;
}

.detail-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78rem;
  width: 0.42rem;
  height: 0.42rem;
  border-radius: 50%;
  background: var(--accent);
}

.timeline {
  display: grid;
  gap: 1rem;
}

.timeline-item {
  position: relative;
  padding: 1.25rem 1.25rem 1.2rem 4.35rem;
  border-top: 3px solid rgba(184, 137, 61, 0.16);
}

.timeline-item::before {
  content: attr(data-step);
  position: absolute;
  left: 1.15rem;
  top: 1rem;
  font-family: var(--font-serif);
  font-size: 2rem;
  line-height: 1;
  color: rgba(184, 137, 61, 0.24);
}

.timeline-item h3 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 1.55rem;
  line-height: 1.06;
}

.timeline-item p {
  margin: 0.65rem 0 0;
}

.callout-card {
  padding: 1.35rem;
}

.callout-card.dark {
  color: rgba(255, 250, 242, 0.86);
  background:
    linear-gradient(145deg, #11283d 0%, #17324a 58%, #20384f 100%);
  border-color: rgba(255, 250, 242, 0.12);
}

.callout-card.dark h3,
.callout-card.dark p,
.callout-card.dark li {
  color: rgba(255, 250, 242, 0.84);
}

.callout-card.dark h3 {
  color: #fffaf2;
}

.callout-card h3 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 1.8rem;
  line-height: 1.06;
}

.callout-card p {
  margin: 0.75rem 0 0;
}

.footer {
  padding: 2.2rem 0;
  color: rgba(255, 250, 242, 0.7);
  background: #11283d;
  border-top: 1px solid rgba(255, 250, 242, 0.08);
}

.footer-grid {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.2rem;
}

.footer-title {
  color: #fffaf2;
  font-size: 1.6rem;
}

.footer-copy p {
  margin: 0.28rem 0 0;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem 1.2rem;
}

@media (max-width: 1080px) {
  .hero-meta,
  .card-grid,
  .card-grid.two,
  .split-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 860px) {
  .menu-toggle {
    display: inline-flex;
  }

  .nav-panel {
    position: absolute;
    top: calc(100% + 0.8rem);
    left: 0;
    right: 0;
    z-index: 20;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 1rem;
    border-radius: 0.7rem;
    border: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.99);
    box-shadow: var(--shadow);
  }

  .nav-panel.open {
    display: flex;
  }

  .nav-links {
    flex-direction: column;
    align-items: stretch;
    gap: 0.2rem;
  }

  .nav-group {
    width: 100%;
  }

  .nav-group::after,
  .nav-submenu::before {
    display: none;
  }

  .nav-links > a,
  .nav-parent {
    width: 100%;
    justify-content: space-between;
    padding: 0.7rem 0;
  }

  .nav-submenu {
    position: static;
    min-width: 0;
    margin: 0 0 0.35rem;
    padding: 0.2rem 0 0.2rem 0.9rem;
    border: 0;
    border-left: 1px solid rgba(17, 26, 32, 0.1);
    border-radius: 0;
    background: transparent;
    box-shadow: none;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
    display: none;
  }

  .nav-submenu a {
    padding: 0.62rem 0;
    border-radius: 0;
  }

  .nav-submenu a:hover,
  .nav-submenu a:focus-visible {
    background: transparent;
    color: var(--accent);
  }

  .nav-group.open .nav-submenu {
    display: grid;
  }

  .page-hero {
    padding-top: 3.5rem;
  }

  .section-head,
  .footer-grid {
    align-items: start;
    flex-direction: column;
  }
}

@media (max-width: 640px) {
  .topline {
    font-size: 0.78rem;
  }

  .brand {
    gap: 0.72rem;
    padding: 0.45rem 0.72rem 0.45rem 0.45rem;
    border-radius: 1.1rem;
  }

  .page-title {
    font-size: 2.8rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .button,
  .lang-switch,
  .menu-toggle,
  .nav-links > a::after,
  .nav-parent::after,
  .nav-caret,
  .nav-submenu {
    transition: none;
  }
}