:root {
  --c-ink: #121212;
  --c-coal: #191919;
  --c-graphite: #2C2C2C;
  --c-gold-deep: #B8860B;
  --c-red: #8B0000;
  --c-yellow: #FFD700;
  --c-gold-brown: #8B6914;
  --c-gold-light: #DAA520;
  --c-bone: #F5F5DC;
  --text-body: rgba(245, 245, 220, 0.88);
  --text-label: rgba(245, 245, 220, 0.52);
  --border-gold: rgba(184, 134, 11, 0.4);
  --header-h: 72px;
  --content-max: 1200px;
  --content-pad: clamp(16px, 4.2vw, 48px);
  --font-serif: "Noto Serif SC", "Songti SC", "SimSun", serif;
  --font-sans: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  --golden-surface:
    linear-gradient(145deg, rgba(218, 165, 32, 0.1), transparent 46%),
    repeating-linear-gradient(45deg, rgba(218, 165, 32, 0.045) 0 2px, transparent 2px 8px);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  background: var(--c-ink);
  color: var(--text-body);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  min-height: 100vh;
}

main {
  padding-top: var(--header-h);
  min-height: 60vh;
}

img,
svg,
video {
  max-width: 100%;
  display: block;
  height: auto;
}

a {
  color: var(--c-yellow);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

ul,
ol {
  list-style: none;
}

button {
  font: inherit;
  cursor: pointer;
  background: none;
  border: 0;
  color: inherit;
}

address {
  font-style: normal;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-serif);
  font-weight: 900;
  line-height: 1.2;
  color: var(--c-gold-light);
  letter-spacing: 0.02em;
}

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

:focus-visible {
  outline: 2px solid var(--c-yellow);
  outline-offset: 2px;
}

body.is-locked {
  overflow: hidden;
}

.container {
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--content-pad);
}

.section {
  position: relative;
  padding-block: clamp(48px, 8vh, 96px);
}

.section--pattern::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: var(--golden-surface);
  background-color: transparent;
  pointer-events: none;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 2000;
  padding: 0.6rem 1.1rem;
  background: var(--c-gold-deep);
  color: var(--c-ink);
  font-weight: 700;
  border-radius: 2px;
  transform: translateY(-160%);
  transition: transform 0.2s ease;
}

.skip-link:focus {
  transform: translateY(0);
  text-decoration: none;
}

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  z-index: 3;
  background: rgba(218, 165, 32, 0.08);
  pointer-events: none;
}

.scroll-progress::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, var(--c-red), var(--c-gold-light), var(--c-yellow));
  transform: scaleX(var(--scroll-progress, 0));
  transform-origin: 0 0;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color 0.35s ease, border-color 0.35s ease;
}

.site-header.is-scrolled {
  background: rgba(14, 13, 12, 0.96);
  border-bottom-color: var(--border-gold);
}

.site-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  height: 100%;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  flex: 0 0 auto;
}

.site-brand:hover {
  text-decoration: none;
}

.site-brand--header {
  font-size: 1.05rem;
}

.site-brand--footer {
  font-size: 1.15rem;
}

.site-brand__mark {
  position: relative;
  width: 2.2rem;
  height: 2.2rem;
  flex: 0 0 auto;
  transform: rotate(45deg);
  border: 1px solid var(--c-gold-light);
  background: linear-gradient(135deg, rgba(218, 165, 32, 0.18), rgba(18, 18, 18, 0.7));
  box-shadow: inset 0 0 0 1px rgba(139, 105, 32, 0.6), 0 0 14px rgba(218, 165, 32, 0.22);
}

.site-brand__mark span {
  position: absolute;
  inset: 5px;
  border: 1px solid rgba(218, 165, 32, 0.55);
}

.site-brand__text {
  font-family: var(--font-serif);
  font-weight: 900;
  letter-spacing: 0.08em;
  color: var(--c-gold-light);
  text-shadow: 0 -1px 0 rgba(0, 0, 0, 0.65), 0 1px 0 rgba(255, 255, 255, 0.08);
}

@supports ((-webkit-background-clip: text) or (background-clip: text)) {
  .site-brand__text {
    background: linear-gradient(180deg, #FFD700 0%, #DAA520 42%, #B8860B 78%, #8B6914 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
    text-shadow: none;
    filter: drop-shadow(0 1px 0 rgba(0, 0, 0, 0.8)) drop-shadow(0 0 12px rgba(218, 165, 32, 0.2));
  }
}

.site-nav-toggle {
  position: relative;
  z-index: 1300;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid transparent;
}

.site-nav-toggle__line {
  width: 22px;
  height: 2px;
  background: var(--c-gold-light);
  transition: transform 0.25s ease, opacity 0.2s ease;
}

.site-nav-toggle__label {
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  color: rgba(245, 245, 220, 0.6);
}

.site-nav-toggle[aria-expanded="true"] .site-nav-toggle__line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.site-nav-toggle[aria-expanded="true"] .site-nav-toggle__line:nth-child(2) {
  opacity: 0;
}

.site-nav-toggle[aria-expanded="true"] .site-nav-toggle__line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-nav {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  z-index: 1100;
  max-width: 100%;
  overflow-y: auto;
  padding: calc(var(--header-h) + 24px) var(--content-pad) 32px;
  background-color: #14120e;
  background-image: var(--golden-surface);
  border-left: 1px solid rgba(184, 134, 11, 0.45);
  transform: translateX(102%);
  visibility: hidden;
  transition: transform 0.32s cubic-bezier(0.22, 0.61, 0.36, 1), visibility 0s 0.32s;
}

.site-nav[data-open="true"] {
  transform: translateX(0);
  visibility: visible;
  transition: transform 0.32s cubic-bezier(0.22, 0.61, 0.36, 1), visibility 0s;
}

.site-nav::after {
  content: "";
  display: block;
  margin-top: 24px;
  height: 1px;
  background: linear-gradient(90deg, rgba(184, 134, 11, 0.4), transparent);
}

.site-nav__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.site-nav__item {
  margin: 0;
}

.site-nav__link {
  display: block;
  position: relative;
  padding: 0.7rem 0.5rem;
  color: rgba(245, 245, 220, 0.8);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-decoration: none;
  transition: color 0.25s ease, background-color 0.25s ease;
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  height: 2px;
  width: 0;
  background: linear-gradient(90deg, var(--c-red), var(--c-yellow));
  transition: width 0.25s ease;
}

.site-nav__link:hover {
  color: var(--c-yellow);
  background: rgba(218, 165, 32, 0.08);
  text-decoration: none;
}

.site-nav__link:hover::after,
.site-nav__link.is-current::after,
.site-nav__link[aria-current="page"]::after {
  width: 100%;
}

.site-nav__link.is-current,
.site-nav__link[aria-current="page"] {
  color: var(--c-yellow);
}

.site-nav__status {
  display: none;
}

.site-nav__status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-yellow);
  box-shadow: 0 0 8px var(--c-yellow);
  animation: status-pulse 2.8s ease-in-out infinite;
}

@keyframes status-pulse {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 1; }
}

.site-footer {
  position: relative;
  margin-top: auto;
  background-color: #151414;
  background-image: var(--golden-surface);
  border-top: 1px solid rgba(184, 134, 11, 0.35);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset-inline: 0;
  top: -3px;
  height: 3px;
  background: linear-gradient(135deg, var(--c-red), var(--c-gold-deep) 40%, var(--c-yellow) 80%);
  opacity: 0.7;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.25rem;
  padding-block: 3rem 2rem;
}

.site-footer__brand {
  display: block;
}

.site-footer__tagline {
  margin-top: 0.6rem;
  font-family: var(--font-serif);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--c-gold-light);
}

.site-footer__trust {
  margin-top: 0.75rem;
  max-width: 46em;
  font-size: 0.9rem;
  color: var(--text-label);
}

.site-footer__title {
  font-size: 1.02rem;
  color: var(--c-gold-light);
  margin-bottom: 0.9rem;
  letter-spacing: 0.12em;
  font-weight: 900;
}

.site-footer__links,
.site-footer__legal {
  display: grid;
  gap: 0.55rem;
}

.site-footer__link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: rgba(245, 245, 220, 0.72);
  transition: color 0.2s ease;
}

.site-footer__link::before {
  content: "→";
  color: var(--c-gold-light);
}

.site-footer__link:hover {
  color: var(--c-yellow);
  text-decoration: none;
}

.site-footer__address {
  margin-top: 0.2rem;
  font-size: 0.92rem;
  line-height: 1.8;
  color: rgba(245, 245, 220, 0.8);
}

.site-footer__note {
  margin-top: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-label);
}

.site-footer__legal {
  margin-top: 1.25rem;
  border-top: 1px dashed rgba(184, 134, 11, 0.25);
  padding-top: 1rem;
}

.site-footer__meta {
  border-top: 1px solid rgba(184, 134, 11, 0.2);
}

.site-footer__meta-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
  padding-block: 1rem 1.2rem;
  font-size: 0.82rem;
  color: rgba(245, 245, 220, 0.5);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  border-radius: 2px;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

.btn--primary {
  background: linear-gradient(135deg, var(--c-gold-light), var(--c-gold-deep));
  color: var(--c-ink);
  box-shadow: 0 2px 0 var(--c-red), 0 6px 18px rgba(0, 0, 0, 0.35);
}

.btn--primary:hover {
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 4px 0 var(--c-red), 0 10px 24px rgba(0, 0, 0, 0.4);
}

.btn--ghost {
  border: 1px solid rgba(184, 134, 11, 0.6);
  color: var(--c-yellow);
  background: rgba(18, 18, 18, 0.6);
}

.btn--ghost:hover {
  border-color: var(--c-yellow);
  background: rgba(184, 134, 11, 0.12);
  text-decoration: none;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.85rem;
  color: var(--text-label);
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  color: rgba(218, 165, 32, 0.35);
}

.breadcrumb__link {
  color: rgba(245, 245, 220, 0.62);
  transition: color 0.2s ease;
}

.breadcrumb__link:hover {
  color: var(--c-yellow);
}

.breadcrumb__link[aria-current="page"],
.breadcrumb__link--current {
  color: var(--c-yellow);
}

.page-heading {
  padding-block: 4rem 2.5rem;
}

.page-heading__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.85rem;
  letter-spacing: 0.18em;
  font-weight: 700;
  color: var(--c-yellow);
  text-transform: uppercase;
}

.page-heading__eyebrow::before {
  content: "";
  width: 32px;
  height: 2px;
  background: var(--c-gold-light);
}

.page-heading__title {
  font-size: clamp(2rem, 5.2vw, 3.75rem);
  margin-top: 0.6rem;
}

.page-heading__intro {
  max-width: 44em;
  margin-top: 0.8rem;
  font-size: 1.05rem;
  color: var(--text-body);
}

.chapter-heading {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  border-bottom: 1px solid var(--border-gold);
  padding-bottom: 0.75rem;
  margin-bottom: 2rem;
}

.chapter-heading__number {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 2.6rem;
  line-height: 1;
  letter-spacing: -0.02em;
  color: transparent;
  -webkit-text-stroke: 1px var(--c-gold-light);
}

.chapter-heading__title {
  font-size: clamp(1.4rem, 3vw, 2.1rem);
  color: var(--c-gold-light);
}

.chapter-heading__meta {
  margin-left: auto;
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  color: var(--text-label);
}

.chapter-section {
  position: relative;
  padding-left: clamp(20px, 3vw, 36px);
}

.chapter-section::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, rgba(139, 0, 0, 0.7), rgba(218, 165, 32, 0.8));
  opacity: 0.35;
  transition: opacity 0.3s ease, box-shadow 0.3s ease;
}

.chapter-section.is-current::before {
  opacity: 1;
  box-shadow: 0 0 12px rgba(218, 165, 32, 0.5);
}

.data-panel {
  position: relative;
  background-color: #1a1a1a;
  background-image: linear-gradient(180deg, rgba(44, 44, 44, 0.45), rgba(20, 20, 20, 0.92));
  border: 1px solid rgba(184, 134, 11, 0.3);
  border-top: 3px solid var(--c-gold-deep);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.32);
}

.data-panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid rgba(184, 134, 11, 0.2);
}

.data-panel__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--c-gold-light);
  letter-spacing: 0.08em;
  font-family: var(--font-sans);
}

.data-panel__status {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.75rem;
  color: var(--text-label);
}

.data-panel__status::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-yellow);
  box-shadow: 0 0 8px var(--c-yellow);
}

.data-panel__body {
  padding: 1.25rem;
}

.metric-panel {
  display: grid;
  gap: 0.4rem;
}

.metric-value {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 2.4rem;
  line-height: 1.1;
  color: var(--c-yellow);
  letter-spacing: 0.02em;
}

.metric-label {
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--text-label);
  text-transform: uppercase;
}

.stat-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.7rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  border: 1px solid rgba(184, 134, 11, 0.45);
  background: rgba(18, 18, 18, 0.65);
  color: var(--c-bone);
}

.stat-tag::before {
  content: "";
  width: 5px;
  height: 5px;
  background: var(--c-gold-deep);
  transform: rotate(45deg);
}

.media-frame {
  position: relative;
  overflow: hidden;
  min-height: 180px;
  border: 1px solid rgba(184, 134, 11, 0.3);
  background-image: linear-gradient(135deg, #191919 0%, #242424 55%, #2c2c2c 100%);
}

.media-frame::before {
  content: attr(data-caption);
  position: absolute;
  left: 16px;
  bottom: 14px;
  color: rgba(245, 245, 220, 0.75);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  padding-bottom: 2px;
  border-bottom: 1px solid var(--c-gold-light);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 12px;
  border: 1px solid rgba(184, 134, 11, 0.3);
  pointer-events: none;
}

.info-card {
  position: relative;
  padding: 1.5rem;
  background: rgba(44, 44, 44, 0.42);
  border: 1px solid rgba(184, 134, 11, 0.22);
  transition: border-color 0.25s ease, background-color 0.25s ease;
}

.info-card::after {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid rgba(184, 134, 11, 0.15);
  pointer-events: none;
}

.info-card:hover {
  border-color: rgba(218, 165, 32, 0.55);
  background: rgba(44, 44, 44, 0.65);
}

.info-card__title {
  font-family: var(--font-serif);
  font-weight: 900;
  color: var(--c-yellow);
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.grid-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.config-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 1rem;
}

.o-reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s cubic-bezier(0.22, 0.61, 0.36, 1), transform 0.6s cubic-bezier(0.22, 0.61, 0.36, 1);
  will-change: opacity, transform;
}

.o-reveal.is-visible {
  opacity: 1;
  transform: none;
}

.legal-content {
  max-width: 70ch;
  font-size: 0.98rem;
  line-height: 1.75;
  color: var(--text-body);
}

.legal-content h2 {
  margin-top: 2.2rem;
  margin-bottom: 0.7rem;
  font-size: 1.25rem;
  color: var(--c-gold-light);
}

.legal-content p {
  margin-bottom: 1rem;
}

.legal-content ul {
  list-style: disc;
  padding-left: 1.4rem;
  margin-bottom: 1rem;
}

.legal-content a {
  color: var(--c-yellow);
  text-decoration: underline;
}

@media (min-width: 768px) {
  .site-footer__grid {
    grid-template-columns: 1.4fr 0.8fr 1fr;
    gap: 3rem;
  }

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

  .grid-split--wide-left {
    grid-template-columns: 1.5fr 1fr;
  }

  .grid-split--wide-right {
    grid-template-columns: 1fr 1.5fr;
  }
}

@media (min-width: 960px) {
  .site-nav-toggle {
    display: none;
  }

  .site-nav {
    position: static;
    width: auto;
    height: auto;
    max-width: none;
    visibility: visible;
    transform: none;
    display: flex;
    align-items: center;
    overflow: visible;
    padding: 0;
    background: transparent;
    border-left: 0;
    transition: none;
  }

  .site-nav[data-open="true"] {
    transform: none;
    transition: none;
  }

  .site-nav::after {
    display: none;
  }

  .site-nav__list {
    flex-direction: row;
    align-items: center;
    gap: 0.25rem;
  }

  .site-nav__link {
    padding: 0.6rem 0.8rem;
    font-size: 0.95rem;
  }

  .site-nav__link:hover {
    background: transparent;
  }

  .site-nav__status {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    margin-left: 1rem;
    padding-left: 1rem;
    border-left: 1px solid var(--border-gold);
    font-size: 0.78rem;
    letter-spacing: 0.1em;
    color: var(--text-label);
  }
}

@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;
  }

  .o-reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

@media print {
  .site-header,
  .site-nav-toggle,
  .scroll-progress,
  .skip-link {
    display: none !important;
  }

  main {
    padding-top: 0;
  }

  body {
    background: #fff;
    color: #111;
  }

  .site-footer {
    background: #fff;
    border-top: 1px solid #333;
  }
}