:root {
  --c-gold: #F5C518;
  --c-red: #8B0000;
  --c-dark: #1A1A1D;
  --c-bright: #FFD700;
  --c-light-gold: #F9E79F;
  --c-crimson: #DC143C;
  --c-off-white: #F5F5F0;
  --c-muted: #B8860B;
  --c-black: #0A0A0A;
  --font-display: "Songti SC", "STSong", "Noto Serif SC", "Source Han Serif SC", Georgia, "Times New Roman", serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --space-xs: .5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 3rem;
  --space-xl: 5rem;
  --container: 1200px;
  --edge: max(1rem, calc((100vw - var(--container)) / 2));
  --border-w: 2px;
  --shadow-l: 0 12px 34px rgba(0, 0, 0, .5);
}

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

html {
  scroll-behavior: smooth;
}

body {
  background: var(--c-black);
  color: var(--c-off-white);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

ul {
  list-style: none;
}

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

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.15;
}

.site-container {
  width: min(var(--container), 92vw);
  margin-inline: auto;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .8rem 1.6rem;
  font-weight: 700;
  border: var(--border-w) solid transparent;
  letter-spacing: .04em;
  text-transform: uppercase;
  transition: transform .2s, box-shadow .2s, background .2s, color .2s;
}

.btn-gold {
  background: var(--c-gold);
  border-color: var(--c-gold);
  color: var(--c-black);
}

.btn-gold:hover {
  background: var(--c-bright);
  box-shadow: 0 0 0 4px rgba(245, 197, 24, .25);
  transform: translateY(-2px);
}

.btn-crimson {
  background: var(--c-crimson);
  border-color: var(--c-crimson);
  color: #fff;
}

.btn-crimson:hover {
  background: var(--c-red);
  box-shadow: 0 0 0 4px rgba(220, 20, 60, .25);
  transform: translateY(-2px);
}

.btn-ghost {
  background: transparent;
  border-color: var(--c-gold);
  color: var(--c-gold);
}

.btn-ghost:hover {
  background: var(--c-gold);
  color: var(--c-black);
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  padding: 1.2rem 0;
  color: var(--c-muted);
  font-size: .9rem;
}

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

.section {
  padding-block: var(--space-lg);
}

.chapter {
  position: relative;
  padding: var(--space-md) 0;
  border-top: 2px solid rgba(184, 134, 11, .3);
}

.chapter::before {
  content: attr(data-index);
  position: absolute;
  right: 0;
  top: -20px;
  font-family: var(--font-display);
  font-size: 3rem;
  line-height: 1;
  color: rgba(245, 197, 24, .14);
}

.chapter-title {
  font-size: clamp(1.8rem, 4vw, 3rem);
  color: var(--c-light-gold);
}

.prose {
  max-width: 75ch;
}

.prose p {
  margin-bottom: 1.2rem;
  color: rgba(245, 245, 240, .85);
}

.grid-2,
.grid-3,
.grid-layers {
  display: grid;
  gap: var(--space-md);
}

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

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-layers {
  grid-template-columns: 1.4fr .8fr;
}

.img-scene {
  position: relative;
  aspect-ratio: 16 / 9;
  background: linear-gradient(160deg, var(--c-red), var(--c-dark));
  border: 2px solid var(--c-muted);
  box-shadow: var(--shadow-l);
  overflow: hidden;
}

.img-scene::before {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px solid rgba(245, 197, 24, .5);
  z-index: 1;
  pointer-events: none;
}

.img-scene::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 30%, rgba(245, 197, 24, .18));
  pointer-events: none;
}

.img-scene--tall {
  aspect-ratio: 3 / 4;
}

.img-scene--gold {
  background: linear-gradient(160deg, var(--c-gold), var(--c-dark));
}

.tag-chip {
  display: inline-block;
  padding: .3em .7em;
  font-size: .8rem;
  border: 1px solid var(--c-muted);
  color: var(--c-light-gold);
  background: rgba(184, 134, 11, .12);
  border-radius: 999px;
}

.tag-chip--gold {
  border-color: var(--c-gold);
  color: var(--c-gold);
  background: rgba(245, 197, 24, .08);
}

.scroll-x {
  display: flex;
  gap: 1rem;
  overflow-x: auto;
  padding-bottom: 1rem;
  scroll-snap-type: x mandatory;
}

.scroll-x > * {
  flex: 0 0 80%;
  scroll-snap-align: start;
}

.card {
  background: var(--c-dark);
  border: 2px solid rgba(184, 134, 11, .35);
  padding: 1.5rem;
  box-shadow: var(--shadow-l);
}

.card--red {
  background: var(--c-red);
  border-color: rgba(245, 197, 24, .4);
  color: var(--c-off-white);
}

.note-vertical {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-size: .8rem;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--c-muted);
}

.hero-plate {
  position: relative;
  background: linear-gradient(135deg, var(--c-red), var(--c-black) 68%);
  border: 3px solid var(--c-muted);
  padding: var(--space-lg);
  box-shadow: var(--shadow-l);
}

.hero-plate::after {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid rgba(245, 197, 24, .4);
  pointer-events: none;
}

[data-toc] a {
  display: block;
  padding: .35rem .8rem;
  border-left: 2px solid transparent;
  color: var(--c-muted);
  transition: color .2s, border-color .2s, background .2s;
}

[data-toc] a:hover {
  color: var(--c-light-gold);
}

[data-toc] a.is-active {
  color: var(--c-gold);
  border-left-color: var(--c-gold);
  background: rgba(245, 197, 24, .06);
}

.site-header {
  position: relative;
  background: var(--c-black);
  color: var(--c-off-white);
  z-index: 100;
}

.skip-link {
  position: fixed;
  top: -120px;
  left: 1rem;
  z-index: 2000;
  background: var(--c-gold);
  color: var(--c-black);
  padding: .7rem 1.2rem;
  font-weight: 700;
  border-radius: 4px;
}

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

.progress-track {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: rgba(255, 255, 255, .1);
  z-index: 3000;
  pointer-events: none;
}

.progress-bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--c-gold), var(--c-crimson));
}

.topbar {
  position: relative;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: .25rem 2rem;
  background: var(--c-red);
  color: var(--c-light-gold);
  padding: .4rem 1rem;
  font-size: .82rem;
  border-bottom: 2px solid var(--c-muted);
  letter-spacing: .08em;
}

.topbar::after {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  width: 8rem;
  height: 100%;
  background: var(--c-crimson);
  clip-path: polygon(18% 0, 100% 0, 100% 100%, 0 100%);
  opacity: .45;
  pointer-events: none;
}

.topbar-badge,
.topbar-time {
  position: relative;
  z-index: 1;
}

.topbar-time {
  font-weight: 600;
}

.masthead {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.1rem;
  padding-block: 1.6rem;
}

.header-glyph {
  position: absolute;
  right: -2vw;
  top: 1rem;
  z-index: 1;
  font-family: var(--font-display);
  font-size: clamp(9rem, 18vw, 17rem);
  line-height: 1;
  color: rgba(245, 197, 24, .05);
  pointer-events: none;
}

.brand-lock {
  position: relative;
  z-index: 2;
  text-align: center;
}

.brand-mark {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
}

.brand-lg {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 7vw, 4.6rem);
  line-height: 1;
  font-weight: 900;
  color: var(--c-gold);
  letter-spacing: .04em;
}

.brand-accent {
  color: var(--c-crimson);
}

.brand-sub {
  margin-top: .25rem;
  font-size: .8rem;
  letter-spacing: .5em;
  text-transform: uppercase;
  color: var(--c-light-gold);
}

.nav-toggle {
  display: none;
}

.main-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: .15rem;
  width: 100%;
  border-top: 1px solid var(--c-muted);
  border-bottom: 1px solid var(--c-muted);
  padding: .5rem .2rem;
}

.main-nav a:not(.btn) {
  padding: .5rem .9rem;
  font-size: .94rem;
  font-weight: 600;
  border: 1px solid transparent;
  transition: color .2s, border-color .2s, background .2s;
}

.main-nav a:not(.btn):hover {
  color: var(--c-gold);
  border-color: var(--c-muted);
}

.main-nav a[aria-current="page"] {
  background: var(--c-gold);
  color: var(--c-black);
  border-color: var(--c-gold);
}

.nav-cta {
  margin-left: auto;
  margin-right: .2rem;
  padding: .45rem 1.1rem;
  font-size: .82rem;
}

.site-footer {
  position: relative;
  margin-top: var(--space-xl);
  background: var(--c-black);
  border-top: 4px solid var(--c-gold);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 2px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--c-crimson);
}

.footer-badge-strip {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem 2.5rem;
  background: var(--c-red);
  color: var(--c-light-gold);
  padding: .55rem 1rem;
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .15em;
  text-transform: uppercase;
  border-bottom: 2px solid var(--c-muted);
}

.footer-main {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.4fr .8fr .8fr 1fr;
  gap: var(--space-md);
  padding: var(--space-lg) var(--edge);
}

.footer-glyph {
  position: absolute;
  right: -1rem;
  bottom: -3rem;
  z-index: 0;
  font-family: var(--font-display);
  font-size: clamp(10rem, 22vw, 22rem);
  line-height: 1;
  color: rgba(245, 197, 24, .04);
  pointer-events: none;
}

.footer-logo {
  font-family: var(--font-display);
  font-size: 2.3rem;
  font-weight: 900;
  color: var(--c-gold);
}

.footer-brand {
  position: relative;
  z-index: 1;
}

.footer-desc,
.footer-trust-detail {
  max-width: 42ch;
  margin-top: .55rem;
  font-size: .92rem;
  color: rgba(245, 245, 240, .75);
}

.footer-trust-detail {
  color: var(--c-light-gold);
  border-left: 3px solid var(--c-crimson);
  padding-left: .8rem;
}

.footer-main h2 {
  position: relative;
  z-index: 1;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: .2em;
  color: var(--c-gold);
  border-bottom: 1px solid var(--c-muted);
  padding-bottom: .5rem;
  margin-bottom: 1rem;
}

.footer-main ul {
  position: relative;
  z-index: 1;
}

.footer-main ul li a {
  display: block;
  padding: .32rem 0;
  color: rgba(245, 245, 240, .7);
  transition: color .2s, text-indent .2s;
}

.footer-main ul li a:hover {
  color: var(--c-gold);
  text-indent: .3rem;
}

.footer-contact-col li {
  padding: .3rem 0;
  color: rgba(245, 245, 240, .7);
  font-size: .92rem;
}

.footer-legal {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  border-top: 1px solid var(--c-muted);
  padding: 1rem var(--edge);
  font-size: .82rem;
  color: var(--c-muted);
}

.back-top {
  position: fixed;
  right: 1.2rem;
  bottom: 1.2rem;
  z-index: 500;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--c-gold);
  color: var(--c-black);
  font-size: 1.2rem;
  font-weight: 900;
  box-shadow: 0 8px 20px rgba(0, 0, 0, .5);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity .25s, transform .25s, visibility .25s;
}

.back-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-top:hover {
  background: var(--c-crimson);
  color: #fff;
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--c-gold);
  outline-offset: 3px;
}

@media (max-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

@media (max-width: 767px) {
  .masthead {
    padding-block: 1rem;
  }

  .nav-toggle {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: .35rem;
    align-self: center;
    padding: .55rem 1.1rem;
    border: 2px solid var(--c-muted);
    color: var(--c-light-gold);
  }

  .toggle-bar {
    width: 24px;
    height: 2px;
    background: var(--c-gold);
    transition: transform .25s, opacity .25s, background .25s;
  }

  .toggle-text {
    font-size: .68rem;
    letter-spacing: .3em;
    text-transform: uppercase;
  }

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

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

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

  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--c-black);
    border-top: none;
    border-bottom: 2px solid var(--c-gold);
    padding: 1rem;
    box-shadow: 0 20px 40px rgba(0, 0, 0, .7);
  }

  .main-nav[data-open] {
    display: flex;
  }

  .main-nav a:not(.btn) {
    display: block;
    width: 100%;
    padding: .9rem 1rem;
    border-bottom: 1px solid rgba(184, 134, 11, .25);
  }

  .main-nav a[aria-current="page"] {
    background: var(--c-gold);
    color: var(--c-black);
  }

  .nav-cta {
    margin-left: 0;
    margin-top: .6rem;
    justify-content: center;
  }

  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }

  .scroll-x > * {
    flex-basis: 85%;
  }

  .img-scene {
    aspect-ratio: 4 / 3;
  }

  .topbar {
    gap: .1rem .6rem;
    padding: .3rem .6rem;
    font-size: .74rem;
  }

  .footer-main {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
    padding-top: var(--space-md);
  }

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

  .back-top {
    right: .8rem;
    bottom: .8rem;
  }
}

@media (min-width: 768px) and (max-width: 1024px) {
  .scroll-x > * {
    flex-basis: 46%;
  }
}

@media (min-width: 1025px) {
  .scroll-x > * {
    flex-basis: 30%;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}