:root {
  --container-w: 1440px;
  --header-h: 72px;
  --c-ink: #0B1F1A;
  --c-pine: #0E3B2E;
  --c-neon: #00E88F;
  --c-gold: #D4AF37;
  --c-paper: #F4EFE6;
  --c-red: #C62828;
  --c-mist: #A8C5B8;
  --c-carbon: #111111;
  --font-sans: "Noto Sans SC", "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", STSong, serif;
  --font-mono: "JetBrains Mono", "SF Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

@media (min-width: 768px) {
  :root {
    --header-h: 84px;
  }
}

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

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

body {
  margin: 0;
  background: var(--c-ink);
  color: var(--c-paper);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-sans);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.015em;
  margin: 0 0 0.5em;
  color: inherit;
}

p {
  margin: 0 0 1em;
}

p:last-child {
  margin-bottom: 0;
}

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

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

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

:focus-visible {
  outline: 3px solid var(--c-neon);
  outline-offset: 3px;
  border-radius: 2px;
}

.section--paper :focus-visible,
.site-footer :focus-visible {
  outline-color: var(--c-red);
}

.container {
  position: relative;
  width: 100%;
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 48px);
}

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

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 2000;
  padding: 10px 18px;
  background: var(--c-gold);
  color: var(--c-ink) !important;
  font-weight: 700;
  transform: translateY(-200%);
  transition: transform 0.3s ease;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  padding: 0.68em 1.35em;
  border: 1px solid var(--c-gold);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: 0.04em;
  text-decoration: none;
  cursor: pointer;
  background: transparent;
  transition: background-color 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}

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

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

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

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

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  line-height: 1;
}

.site-brand__mark {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: var(--c-gold);
  color: var(--c-ink);
  font-size: 1.35rem;
  font-weight: 900;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
}

.site-brand__mark::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  border: 0 solid transparent;
  border-top-width: 14px;
  border-right-width: 14px;
  border-top-color: var(--c-red);
}

.site-brand__text {
  display: inline-flex;
  flex-direction: column;
  gap: 5px;
}

.site-brand__name {
  font-size: 1.1rem;
  font-weight: 900;
  letter-spacing: 0.02em;
  color: var(--c-paper);
  line-height: 1;
}

.site-brand__tagline {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.22em;
  color: var(--c-gold);
  text-transform: uppercase;
  line-height: 1;
}

.site-brand--footer .site-brand__name {
  color: var(--c-paper);
}

.site-brand--footer .site-brand__tagline {
  color: var(--c-neon);
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1200;
  border-bottom: 1px solid transparent;
  transition: background-color 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease;
}

.site-header.is-scrolled {
  background: var(--c-ink);
  border-bottom-color: rgba(212, 175, 55, 0.4);
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.35);
}

.site-header.is-scrolled::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(212, 175, 55, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(212, 175, 55, 0.05) 1px, transparent 1px);
  background-size: 36px 36px;
  pointer-events: none;
}

.site-header__inner {
  position: relative;
  z-index: 2;
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
}

.site-nav {
  margin-left: auto;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(2px, 0.8vw, 10px);
}

.site-nav__item {
  flex-shrink: 0;
}

.site-nav__link {
  position: relative;
  display: block;
  padding: 0.55em 0.7em;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--c-paper);
  white-space: nowrap;
  transition: color 0.2s ease;
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0.7em;
  right: 0.7em;
  bottom: 0.25em;
  height: 2px;
  background: var(--c-neon);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.3s ease, background-color 0.3s ease;
}

.site-nav__link:hover::after {
  transform: scaleX(1);
}

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

.site-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--c-gold);
}

.site-nav__action {
  display: none;
}

.site-header__collect {
  flex-shrink: 0;
  margin-left: 4px;
  padding: 0.55em 1.1em;
  font-size: 0.8125rem;
}

.nav-toggle {
  display: none;
  position: relative;
  z-index: 1400;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: 44px;
  height: 44px;
  margin-left: auto;
  background: rgba(11, 31, 26, 0.5);
  border: 1px solid rgba(212, 175, 55, 0.7);
  border-radius: 2px;
  cursor: pointer;
  transition: background-color 0.25s ease, border-color 0.25s ease;
}

.nav-toggle:hover {
  border-color: var(--c-gold);
  background: rgba(212, 175, 55, 0.15);
}

.nav-toggle__line {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--c-gold);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1500;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--c-gold) 0%, var(--c-neon) 100%);
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
  will-change: transform;
}

.site-footer {
  position: relative;
  background: var(--c-carbon);
  color: var(--c-mist);
  border-top: 2px solid var(--c-gold);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -2px;
  right: 0;
  width: 120px;
  height: 6px;
  background: linear-gradient(90deg, transparent, var(--c-red));
}

.site-footer__l1 {
  padding-top: clamp(40px, 6vw, 72px);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 22px;
}

.site-footer__lead {
  max-width: 60ch;
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--c-mist);
}

.site-footer__l2 {
  margin-top: 34px;
  padding: 22px 0;
  border-top: 1px solid rgba(212, 175, 55, 0.28);
  border-bottom: 1px solid rgba(212, 175, 55, 0.28);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px 24px;
  font-size: 0.8125rem;
}

.site-footer__icp {
  color: var(--c-mist);
  letter-spacing: 0.04em;
}

.site-footer__legal {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.site-footer__legal a {
  color: var(--c-gold);
}

.site-footer__legal a:hover {
  color: var(--c-paper);
}

.site-footer__sep {
  color: rgba(212, 175, 55, 0.5);
}

.site-footer__l3 {
  padding: 22px 0 clamp(28px, 5vw, 56px);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 28px;
  font-size: 0.8125rem;
}

.site-footer__contact-link {
  font-weight: 700;
  color: var(--c-gold);
  border-bottom: 1px solid rgba(212, 175, 55, 0.4);
  padding-bottom: 2px;
}

.site-footer__contact-link:hover {
  color: var(--c-paper);
  border-color: var(--c-paper);
}

.site-footer__meta {
  color: var(--c-mist);
  line-height: 1.7;
}

.page-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + clamp(48px, 8vw, 96px)) 0 clamp(36px, 6vw, 72px);
  background: var(--c-ink);
  color: var(--c-paper);
  border-bottom: 1px solid rgba(212, 175, 55, 0.3);
}

.page-hero::after {
  content: "";
  position: absolute;
  top: -20%;
  right: -6%;
  width: min(44%, 560px);
  height: 160%;
  background: rgba(212, 175, 55, 0.08);
  transform: skewX(-18deg);
  pointer-events: none;
}

.page-hero .container {
  position: relative;
  z-index: 1;
}

.page-hero__title {
  font-size: clamp(2.25rem, 5.5vw, 4.75rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  margin: 0 0 16px;
  max-width: 16em;
}

.page-hero__sub {
  max-width: 46ch;
  font-size: clamp(1rem, 1.5vw, 1.25rem);
  line-height: 1.7;
  color: var(--c-mist);
  margin: 0;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: clamp(20px, 3vw, 36px);
  font-size: 0.8125rem;
}

.breadcrumbs__list {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 8px;
}

.breadcrumbs__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.breadcrumbs__link {
  color: var(--c-gold);
}

.breadcrumbs__link:hover {
  text-decoration: underline;
  color: var(--c-paper);
}

.breadcrumbs__sep {
  color: rgba(212, 175, 55, 0.5);
}

.breadcrumbs [aria-current="page"] {
  color: var(--c-mist);
}

.section {
  padding: clamp(48px, 7vw, 96px) 0;
}

.section--ink {
  background: var(--c-ink);
  color: var(--c-paper);
}

.section--pine {
  background: var(--c-pine);
  color: var(--c-paper);
}

.section--paper {
  background: var(--c-paper);
  color: var(--c-ink);
}

.section--carbon {
  background: var(--c-carbon);
  color: var(--c-paper);
}

.grid {
  display: grid;
  gap: clamp(16px, 2vw, 28px);
}

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

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

@media (min-width: 640px) {
  .grid--2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .grid--2 {
    grid-template-columns: repeat(2, 1fr);
  }

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

.tag {
  display: inline-block;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--c-gold);
  border: 1px solid rgba(212, 175, 55, 0.45);
  background: rgba(212, 175, 55, 0.08);
}

.more-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--c-gold);
  font-weight: 700;
  font-size: 0.9375rem;
  padding-bottom: 4px;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.more-link:hover {
  color: var(--c-red);
  border-color: var(--c-red);
}

.stat-block {
  position: relative;
  padding: 26px 26px 28px;
  border-top: 2px solid var(--c-gold);
  border-left: 1px solid rgba(212, 175, 55, 0.2);
  border-right: 1px solid rgba(212, 175, 55, 0.2);
  border-bottom: 1px solid rgba(212, 175, 55, 0.2);
  background: rgba(255, 255, 255, 0.02);
  overflow: hidden;
}

.stat-block::after {
  content: "";
  position: absolute;
  right: -14px;
  bottom: -14px;
  width: 28px;
  height: 28px;
  background: var(--c-neon);
  transform: rotate(45deg);
  opacity: 0.35;
}

.stat-block__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 4vw, 3.4rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--c-gold);
  letter-spacing: -0.02em;
}

.stat-block__label {
  display: block;
  margin-top: 10px;
  font-size: 0.875rem;
  color: var(--c-mist);
  letter-spacing: 0.05em;
}

.section--paper .stat-block {
  background: rgba(11, 31, 26, 0.03);
  border-color: rgba(11, 31, 26, 0.18);
}

.section--paper .stat-block__num {
  color: var(--c-ink);
}

[data-reveal] {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

[data-reveal-delay="1"].is-visible {
  transition-delay: 0.08s;
}

[data-reveal-delay="2"].is-visible {
  transition-delay: 0.16s;
}

[data-reveal-delay="3"].is-visible {
  transition-delay: 0.24s;
}

[data-reveal-delay="4"].is-visible {
  transition-delay: 0.32s;
}

@media (max-width: 1023px) {
  .site-header__collect {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 1300;
    width: min(86vw, 420px);
    margin: 0;
    padding: calc(var(--header-h) + 28px) clamp(24px, 6vw, 40px) 40px;
    background: var(--c-ink);
    border-left: 1px solid rgba(212, 175, 55, 0.45);
    box-shadow: -24px 0 60px rgba(0, 0, 0, 0.5);
    transform: translateX(102%);
    visibility: hidden;
    transition: transform 0.5s cubic-bezier(0.77, 0, 0.18, 1), visibility 0.5s;
    overflow-y: auto;
  }

  .site-nav[data-open] {
    transform: translateX(0);
    visibility: visible;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .site-nav__link {
    padding: 0.9em 0.6em;
    font-size: 1.125rem;
    font-weight: 700;
    border-bottom: 1px solid rgba(212, 175, 55, 0.12);
  }

  .site-nav__link::after {
    left: 0.6em;
    right: 0.6em;
    bottom: 0.55em;
  }

  .site-nav__action {
    display: block;
    margin-top: 28px;
  }

  .site-nav__cta {
    width: 100%;
  }
}

@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;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .skip-link {
    transition: none;
  }

  .nav-toggle__line {
    transition: none;
  }
}