:root {
  --color-bg: #0B0F1A;
  --color-bg-elev: #111827;
  --color-gold: #D4AF37;
  --color-gold-light: #F0C85E;
  --color-orange: #FF4D00;
  --color-text: #E5E7EB;
  --color-muted: #9CA3AF;
  --color-cyan: #00B4D8;
  --color-error: #7F1D1D;
  --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
  --font-serif: "STKaiti", "KaiTi", "楷体", serif;
  --container-max: 1200px;
  --radius-lg: 28px;
  --radius-md: 16px;
  --radius-pill: 999px;
  --shadow-gold: 0 8px 30px rgba(212, 175, 55, 0.28);
  --transition: 0.25s ease;
}

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

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

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  background-color: var(--color-bg);
  background-image:
    radial-gradient(1100px 500px at 85% -10%, rgba(212, 175, 55, 0.12), transparent 60%),
    radial-gradient(800px 600px at -10% 25%, rgba(0, 180, 216, 0.07), transparent 55%),
    linear-gradient(180deg, #0B0F1A, #0A0E18);
  background-attachment: fixed;
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
}

body::selection {
  background: rgba(212, 175, 55, 0.35);
}

::selection {
  background: rgba(212, 175, 55, 0.3);
  color: var(--color-text);
}

main {
  display: block;
  flex: 1 0 auto;
}

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

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

h1,
h2,
h3,
h4,
p {
  margin: 0;
}

a {
  color: var(--color-gold);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-gold-light);
}

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

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

.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: clamp(1.5rem, 5vw, 3rem);
}

#main-content {
  scroll-margin-top: 120px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -100px;
  z-index: 2000;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-pill);
  background: var(--color-gold);
  color: var(--color-bg);
  font-weight: 700;
  letter-spacing: 0.08em;
  transition: top var(--transition);
}

.skip-link:focus {
  top: 1rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 15, 26, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(212, 175, 55, 0.2);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
}

.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(212, 175, 55, 0.7), transparent);
  pointer-events: none;
}

.header-inner {
  max-width: 1280px;
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 4vw, 3rem);
}

.scroll-progress {
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  max-width: 100%;
  height: 2px;
  z-index: 10;
  background: linear-gradient(90deg, var(--color-gold), var(--color-gold-light), var(--color-orange));
  box-shadow: 0 0 12px rgba(240, 200, 94, 0.6);
  pointer-events: none;
}

.masthead-top {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 1rem;
  padding-top: clamp(1rem, 3vw, 2rem);
  padding-bottom: 0.75rem;
}

.masthead-tagline {
  justify-self: start;
  font-size: 0.75rem;
  letter-spacing: 0.28em;
  color: var(--color-muted);
  white-space: nowrap;
}

.masthead-brand {
  justify-self: center;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  line-height: 1.1;
}

.brand-cn {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-gold);
}

@supports ((-webkit-background-clip: text) or (background-clip: text)) {
  .brand-cn {
    color: transparent;
    background: linear-gradient(120deg, #F0C85E, #D4AF37 45%, #FFF4D6 80%);
    -webkit-background-clip: text;
    background-clip: text;
  }
}

.brand-en {
  font-size: 0.65rem;
  letter-spacing: 0.48em;
  text-indent: 0.48em;
  text-transform: uppercase;
  color: var(--color-gold-light);
}

.header-extra {
  justify-self: end;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.9rem;
  border: 1px solid rgba(212, 175, 55, 0.45);
  border-radius: var(--radius-pill);
  background: rgba(212, 175, 55, 0.08);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--color-gold);
  transition: border-color var(--transition), color var(--transition), box-shadow var(--transition);
}

.header-extra:hover {
  border-color: var(--color-orange);
  color: var(--color-orange);
  box-shadow: 0 0 20px rgba(255, 77, 0, 0.18);
}

.header-nav-row {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-bottom: 0.75rem;
}

.site-nav {
  display: block;
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 0.25rem;
}

.nav-link {
  display: block;
  padding: 0.5rem 0.9rem;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  letter-spacing: 0.14em;
  color: var(--color-text);
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

.nav-link:hover {
  background: rgba(212, 175, 55, 0.1);
  color: var(--color-gold-light);
}

.nav-link[aria-current="page"] {
  background: linear-gradient(135deg, var(--color-gold), var(--color-gold-light));
  color: var(--color-bg);
  font-weight: 700;
}

.nav-toggle {
  display: none;
}

.section {
  padding-block: clamp(4rem, 10vw, 7rem);
}

.section-head {
  display: grid;
  gap: 0.75rem;
  margin-bottom: 3rem;
}

.section-index {
  display: block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.3em;
  color: var(--color-orange);
}

.section-title {
  font-size: clamp(2.25rem, 6vw, 4.5rem);
  line-height: 1.15;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--color-text);
}

.section-desc {
  max-width: 42rem;
  color: var(--color-muted);
  font-size: 1.05rem;
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: clamp(1rem, 3vw, 2rem);
}

.grid-6 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: clamp(1rem, 3vw, 2rem);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1rem, 3vw, 2rem);
}

.col-span-4 {
  grid-column: span 4;
}

.col-span-6 {
  grid-column: span 6;
}

.col-span-8 {
  grid-column: span 8;
}

.col-span-12 {
  grid-column: 1 / -1;
}

.page-header {
  padding: clamp(3rem, 8vw, 6rem) 0 2rem;
}

.page-title {
  font-size: clamp(2.75rem, 8vw, 6rem);
  font-weight: 200;
  line-height: 1.1;
}

.page-title strong {
  font-weight: 900;
  color: var(--color-gold);
}

@supports ((-webkit-background-clip: text) or (background-clip: text)) {
  .page-title strong {
    color: transparent;
    background: linear-gradient(120deg, #F0C85E, #D4AF37, #FF4D00);
    -webkit-background-clip: text;
    background-clip: text;
  }
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.25rem 0 2rem;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--color-muted);
}

.breadcrumbs li {
  display: inline-flex;
  align-items: center;
}

.breadcrumbs li + li::before {
  content: "/";
  margin-right: 0.5rem;
  color: rgba(156, 163, 175, 0.6);
}

.breadcrumbs a {
  color: var(--color-muted);
}

.breadcrumbs a:hover {
  color: var(--color-gold);
}

.content-body {
  max-width: 48rem;
  color: var(--color-muted);
}

.content-body h2 {
  margin: 2.5rem 0 1rem;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
}

.content-body p {
  margin: 0 0 1.25rem;
}

.content-body ul {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
  list-style: disc;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.6rem;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-weight: 700;
  letter-spacing: 0.12em;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition);
}

.btn-gold {
  background: linear-gradient(135deg, var(--color-gold), var(--color-gold-light));
  color: var(--color-bg);
}

.btn-gold:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-gold);
  color: var(--color-bg);
}

.btn-outline {
  border-color: rgba(212, 175, 55, 0.6);
  color: var(--color-gold);
}

.btn-outline:hover {
  background: rgba(212, 175, 55, 0.12);
  border-color: var(--color-orange);
  color: var(--color-orange);
}

.tag,
.tag-orange {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.8rem;
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  border: 1px solid rgba(212, 175, 55, 0.35);
}

.tag {
  background: rgba(212, 175, 55, 0.12);
  color: var(--color-gold);
}

.tag-orange {
  background: rgba(255, 77, 0, 0.15);
  border-color: rgba(255, 77, 0, 0.35);
  color: var(--color-orange);
}

.image-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--color-bg-elev);
  aspect-ratio: 16 / 9;
}

.image-frame.portrait {
  aspect-ratio: 4 / 5;
}

.image-frame::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-gold), var(--color-orange), var(--color-gold-light));
  pointer-events: none;
}

.image-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.8s cubic-bezier(0.22, 1, 0.36, 1);
}

.image-frame:hover img {
  transform: scale(1.03);
}

.js .reveal[data-reveal]:not(.is-visible) {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal[data-reveal].is-visible {
  opacity: 1;
  transform: none;
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.site-footer {
  background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-elev) 45%, var(--color-bg) 100%);
  border-top: 1px solid rgba(212, 175, 55, 0.2);
  padding-top: clamp(2.5rem, 6vw, 5rem);
}

.footer-inner {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: clamp(1.5rem, 5vw, 3rem);
  padding-bottom: 2rem;
}

.footer-top {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: clamp(1.5rem, 4vw, 4rem);
  align-items: start;
  padding-bottom: 2rem;
  border-bottom: 1px solid rgba(212, 175, 55, 0.18);
}

.footer-brand {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 3vw, 2.5rem);
  font-weight: 700;
  color: var(--color-gold);
}

@supports ((-webkit-background-clip: text) or (background-clip: text)) {
  .footer-brand {
    color: transparent;
    background: linear-gradient(120deg, #F0C85E, #D4AF37, #FFF4D6);
    -webkit-background-clip: text;
    background-clip: text;
  }
}

.footer-trust {
  max-width: 42rem;
  color: var(--color-muted);
  font-size: 0.95rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr 0.8fr 1.2fr;
  gap: clamp(2rem, 4vw, 4rem);
  padding-block: 2rem 2.5rem;
}

.footer-block {
  min-width: 0;
}

.footer-heading {
  margin-bottom: 1rem;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.24em;
  color: var(--color-gold);
}

.footer-links,
.contact-list {
  display: grid;
  gap: 0.6rem;
}

.footer-links a {
  display: inline-block;
  color: var(--color-text);
  font-size: 0.95rem;
  transition: color var(--transition), transform var(--transition);
}

.footer-links a:hover {
  color: var(--color-orange);
  transform: translateX(4px);
}

.contact-list li {
  font-size: 0.9rem;
  color: var(--color-muted);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(212, 175, 55, 0.14);
  font-size: 0.8rem;
  color: var(--color-muted);
}

.footer-bottom a {
  color: var(--color-muted);
}

.footer-bottom a:hover {
  color: var(--color-gold);
}

.back-to-top {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 90;
  display: none;
  width: 3rem;
  height: 3rem;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--color-gold);
  background: rgba(11, 15, 26, 0.85);
  color: var(--color-gold);
  font-size: 1.25rem;
  box-shadow: 0 0 20px rgba(212, 175, 55, 0.25);
  transition: background var(--transition), color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.back-to-top.show {
  display: grid;
}

.back-to-top:hover {
  background: linear-gradient(135deg, var(--color-gold), var(--color-gold-light));
  color: var(--color-bg);
  transform: translateY(-3px);
  box-shadow: var(--shadow-gold);
}

@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

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

  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .col-span-4 {
    grid-column: span 2;
  }

  .col-span-6,
  .col-span-8 {
    grid-column: span 6;
  }
}

@media (max-width: 860px) {
  .nav-toggle {
    position: absolute;
    left: 0.5rem;
    top: 50%;
    transform: translateY(-50%);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem;
    color: var(--color-muted);
    font-size: 0.75rem;
    letter-spacing: 0.18em;
  }

  .nav-toggle-icon {
    position: relative;
    display: inline-block;
    width: 1.25rem;
    height: 1rem;
  }

  .nav-toggle-icon::before,
  .nav-toggle-icon::after {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 100%;
    height: 1px;
    background: currentColor;
    transition: transform var(--transition), box-shadow var(--transition);
  }

  .nav-toggle-icon::before {
    transform: translateY(-4px);
    box-shadow: 0 8px 0 currentColor;
  }

  .nav-toggle-icon::after {
    transform: translateY(4px);
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle-icon::before {
    transform: rotate(45deg);
    box-shadow: none;
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle-icon::after {
    transform: rotate(-45deg);
  }

  .site-nav {
    display: none;
    width: 100%;
    padding: 0.75rem 0 0.5rem;
  }

  .site-nav[data-open] {
    display: block;
    border-top: 1px solid rgba(212, 175, 55, 0.18);
    margin-top: 0.5rem;
  }

  .header-nav-row {
    flex-wrap: wrap;
    justify-content: center;
  }

  .nav-list {
    flex-direction: column;
    gap: 0.35rem;
  }

  .nav-link {
    width: 100%;
    padding: 0.65rem 0.5rem;
    text-align: center;
  }
}

@media (max-width: 720px) {
  .masthead-top {
    padding-top: 0.75rem;
  }

  .brand-cn {
    font-size: 1.75rem;
  }

  .brand-en {
    font-size: 0.55rem;
  }

  .header-extra {
    padding: 0.3rem 0.65rem;
    font-size: 0.65rem;
  }

  .grid-6,
  .grid-4,
  .grid-12 {
    grid-template-columns: 1fr;
  }

  .col-span-4,
  .col-span-6,
  .col-span-8,
  .col-span-12 {
    grid-column: 1 / -1;
  }

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

  .footer-bottom {
    justify-content: center;
    text-align: center;
  }
}

@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;
    scroll-behavior: auto !important;
  }

  .js .reveal[data-reveal]:not(.is-visible),
  .reveal[data-reveal].is-visible {
    opacity: 1 !important;
    transform: none !important;
  }
}