:root {
  --c-deep: #0A1E3F;
  --c-navy: #102A4C;
  --c-gold: #D4A24C;
  --c-gold-bright: #F2C94C;
  --c-crimson: #8C1D2F;
  --c-cyan: #00E5FF;
  --c-violet: #9B59B6;
  --c-moon: #EAECEE;
  --c-ink: #1F2429;
  --c-white: #FFFFFF;
  --font-body: 'Arial', 'Microsoft YaHei', sans-serif;
  --font-title: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
  --header-h: 80px;
  --space: 32px;
  --radius: 8px;
  --content-max: 1240px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  color: var(--c-white);
  background-color: var(--c-deep);
  background-image:
    radial-gradient(circle at 15% 10%, rgba(212, 162, 76, 0.08), transparent 32%),
    radial-gradient(circle at 85% 85%, rgba(0, 229, 255, 0.06), transparent 38%);
  padding-top: var(--header-h);
}

body::before,
body::after {
  content: "";
  position: fixed;
  top: 0;
  bottom: 0;
  width: 10px;
  z-index: 1200;
  pointer-events: none;
}

body::before {
  left: 0;
  border-left: 1px solid rgba(212, 162, 76, 0.32);
}

body::after {
  right: 0;
  border-right: 1px solid rgba(212, 162, 76, 0.32);
}

#main-content {
  min-height: 60vh;
  display: block;
}

h1,
h2,
h3 {
  font-family: var(--font-title);
  line-height: 1.2;
  margin: 0 0 0.6em;
  color: inherit;
}

h1 {
  font-size: clamp(32px, 6vw, 56px);
  font-weight: 700;
}

h2 {
  font-size: clamp(24px, 4vw, 36px);
  font-weight: 700;
}

h3 {
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 600;
}

p {
  margin: 0 0 1em;
}

a {
  color: var(--c-cyan);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

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

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

:focus {
  outline: none;
}

:focus-visible {
  outline: 3px solid var(--c-cyan);
  outline-offset: 2px;
  box-shadow: 0 0 0 6px rgba(0, 229, 255, 0.18);
  border-radius: 4px;
}

.container {
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 48px);
}

.section {
  padding-block: clamp(56px, 10vw, 112px);
}

.section--dark {
  background: var(--c-deep);
  color: var(--c-white);
}

.section--navy {
  background: var(--c-navy);
  color: var(--c-white);
}

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

.section--light a {
  color: var(--c-violet);
}

.section--light a:hover {
  color: var(--c-crimson);
}

.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-title);
  font-size: 13px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-violet);
  font-weight: 700;
  margin-bottom: 12px;
}

.section-kicker::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--c-gold);
}

.section-title {
  margin-bottom: 0.25em;
}

.section-desc {
  font-size: 17px;
  max-width: 720px;
  color: rgba(255, 255, 255, 0.72);
}

.section--light .section-desc {
  color: rgba(31, 36, 41, 0.7);
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
  padding: 0;
  margin: 0 0 28px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.55);
}

.breadcrumbs li + li::before {
  content: "/";
  margin-right: 6px;
  color: rgba(255, 255, 255, 0.35);
}

.breadcrumbs a {
  color: var(--c-cyan);
  text-decoration: none;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 6px;
  font-family: var(--font-title);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  padding: 12px 18px;
  border: 1px solid transparent;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.btn--gold {
  background: linear-gradient(135deg, var(--c-gold), var(--c-gold-bright));
  color: var(--c-deep);
  box-shadow: 0 6px 18px rgba(212, 162, 76, 0.22);
}

.btn--gold:hover {
  color: var(--c-deep);
  filter: brightness(1.04);
  box-shadow: 0 8px 22px rgba(242, 201, 76, 0.32);
}

.btn--outline {
  border-color: var(--c-gold);
  color: var(--c-gold-bright);
  background: rgba(212, 162, 76, 0.04);
}

.btn--outline:hover {
  background: rgba(212, 162, 76, 0.12);
  color: var(--c-gold-bright);
}

.grid {
  display: grid;
  gap: clamp(16px, 3vw, 28px);
}

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

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

.glass-panel {
  background: rgba(255, 255, 255, 0.055);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.card {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color 0.25s ease, transform 0.25s ease, background-color 0.25s ease;
}

.card:hover {
  border-color: var(--c-gold);
  transform: translateY(-3px);
}

.topic-index {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
}

.topic-index__item {
  position: relative;
  padding: 16px 16px 16px 22px;
  border-left: 2px solid var(--c-gold);
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.04), transparent);
}

.topic-index__link {
  display: block;
  color: var(--c-white);
  text-decoration: none;
}

.topic-index__num {
  display: block;
  font-family: var(--font-title);
  font-size: 12px;
  color: var(--c-cyan);
  letter-spacing: 0.15em;
}

.image-shell {
  position: relative;
  display: block;
  overflow: hidden;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--c-navy), var(--c-deep));
  border: 1px solid rgba(212, 162, 76, 0.24);
  min-height: 180px;
}

.image-shell::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(90deg, transparent 0 18px, rgba(212, 162, 76, 0.07) 18px 19px, transparent 19px 36px),
    repeating-linear-gradient(0deg, transparent 0 18px, rgba(255, 255, 255, 0.03) 18px 19px, transparent 19px 36px);
  pointer-events: none;
}

.image-shell::after {
  content: "";
  position: absolute;
  right: -20%;
  bottom: -30%;
  width: 60%;
  aspect-ratio: 1;
  border-radius: 50%;
  border: 1px solid rgba(0, 229, 255, 0.18);
  pointer-events: none;
}

.image-shell--wide {
  aspect-ratio: 16 / 7;
}

.image-shell--square {
  aspect-ratio: 1 / 1;
}

.image-shell--arch {
  aspect-ratio: 4 / 5;
  border-radius: 2rem 2rem 10px 10px;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -100px;
  z-index: 1300;
  background: var(--c-gold);
  color: var(--c-deep);
  padding: 12px 18px;
  border-radius: 4px;
  text-decoration: none;
  font-weight: 700;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 12px;
}

.site-header {
  position: fixed;
  inset-inline: 0;
  top: 0;
  z-index: 1100;
  background: rgba(10, 30, 63, 0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-gold);
}

.progress-bar {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--c-gold), var(--c-cyan), var(--c-violet));
  transform: scaleX(0);
  transform-origin: left center;
  will-change: transform;
}

.header__inner {
  max-width: var(--content-max);
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 24px);
  min-height: var(--header-h);
  padding-inline: clamp(14px, 4vw, 48px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--c-white);
  flex-shrink: 0;
}

.brand:hover {
  color: var(--c-white);
}

.brand__mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border: 1px solid var(--c-gold);
  border-radius: 5px;
  font-family: var(--font-title);
  font-size: 20px;
  font-weight: 700;
  color: var(--c-gold-bright);
  background: linear-gradient(145deg, rgba(212, 162, 76, 0.24), rgba(212, 162, 76, 0.05));
  box-shadow: 0 0 14px rgba(212, 162, 76, 0.12);
}

.brand__text {
  display: grid;
  line-height: 1.1;
}

.brand__name {
  display: block;
  font-family: var(--font-title);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.brand__sub {
  display: block;
  font-size: 11px;
  letter-spacing: 0.32em;
  color: var(--c-gold);
}

.site-nav {
  margin-left: clamp(24px, 4vw, 72px);
}

.site-nav__list {
  display: flex;
  flex-wrap: nowrap;
  gap: clamp(12px, 2vw, 32px);
}

.site-nav__link {
  display: inline-block;
  color: rgba(255, 255, 255, 0.78);
  text-decoration: none;
  font-family: var(--font-title);
  font-size: 15px;
  font-weight: 600;
  white-space: nowrap;
  padding-block: 10px;
  border-bottom: 2px solid transparent;
  transition: color 0.25s ease, border-color 0.25s ease;
}

.site-nav__link:hover {
  color: var(--c-gold-bright);
  border-bottom-color: var(--c-gold);
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.header-search-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--c-cyan);
  text-decoration: none;
  font-size: 14px;
  padding: 8px 14px;
  border: 1px solid rgba(0, 229, 255, 0.35);
  border-radius: 999px;
  background: rgba(0, 229, 255, 0.06);
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.header-search-link:hover {
  color: var(--c-gold-bright);
  border-color: var(--c-gold);
  background: rgba(242, 201, 76, 0.06);
}

.header-search-link__label {
  display: inline;
}

.quick-link {
  position: relative;
  padding: 8px 14px;
  font-size: 14px;
}

.quick-link--hot::after {
  content: "";
  position: absolute;
  top: 2px;
  right: 2px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-crimson);
  box-shadow: 0 0 8px rgba(140, 29, 47, 0.8);
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  width: 48px;
  height: 48px;
  padding: 6px 10px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 6px;
  background: transparent;
  cursor: pointer;
  flex-shrink: 0;
}

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

.nav-toggle__text {
  font-family: var(--font-title);
  font-size: 11px;
  color: var(--c-gold);
  letter-spacing: 0.1em;
}

.site-footer {
  position: relative;
  overflow: hidden;
  background: linear-gradient(180deg, var(--c-deep), #060F21);
  border-top: 2px solid var(--c-gold);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset-inline: 0;
  top: 0;
  height: 34px;
  background: repeating-linear-gradient(90deg, transparent 0 32px, rgba(212, 162, 76, 0.18) 32px 33px, transparent 33px 64px);
  pointer-events: none;
}

.footer__inner {
  max-width: var(--content-max);
  margin-inline: auto;
  padding: 64px clamp(20px, 4vw, 48px) 28px;
  position: relative;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.2fr 1fr;
  gap: clamp(28px, 5vw, 64px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding-bottom: 40px;
}

.footer-block--brand {
  display: grid;
  align-content: start;
}

.brand--footer {
  margin-bottom: 18px;
}

.brand--footer .brand__mark {
  width: 46px;
  height: 46px;
  font-size: 22px;
}

.brand--footer .brand__name {
  font-size: 22px;
}

.footer-statement {
  font-size: 14px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.55);
  max-width: 360px;
  margin: 0;
}

.footer-title {
  color: var(--c-gold);
  font-family: var(--font-title);
  font-size: 14px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin: 0 0 18px;
}

.footer-list {
  display: grid;
  gap: 10px;
}

.footer-list a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.footer-list a:hover {
  color: var(--c-gold-bright);
  padding-left: 4px;
}

.footer-contact li {
  border-left: 1px solid rgba(212, 162, 76, 0.25);
  padding-left: 12px;
}

.footer-contact__label {
  display: block;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.45);
}

.footer-contact-link {
  font-weight: 600;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
}

.footer-bottom p {
  margin: 0;
}

.js [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.45s cubic-bezier(0.22, 0.61, 0.36, 1), transform 0.45s cubic-bezier(0.22, 0.61, 0.36, 1);
}

.js [data-reveal="visible"] {
  opacity: 1;
  transform: none;
}

@media (max-width: 1024px) {
  :root {
    --header-h: 72px;
  }

  .header__inner {
    flex-wrap: wrap;
    padding-block: 8px;
  }

  .header-actions {
    margin-left: auto;
  }

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

  .site-nav {
    flex-basis: 100%;
    order: 3;
    margin-left: 0;
    display: none;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    border-top: 1px solid rgba(212, 162, 76, 0.25);
    margin-top: 10px;
    padding-bottom: 14px;
  }

  .site-nav__list {
    flex-direction: column;
    gap: 0;
  }

  .site-nav__link {
    display: block;
    padding: 16px 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    border-left: 3px solid transparent;
  }

  .site-nav__link:hover {
    border-bottom-color: rgba(255, 255, 255, 0.08);
  }

  .site-nav__link[aria-current="page"] {
    border-bottom-color: transparent;
    border-left-color: var(--c-gold);
    background: rgba(212, 162, 76, 0.08);
  }

  .site-header[data-open] .site-nav {
    display: block;
  }

  .site-header[data-open] .nav-toggle__line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .site-header[data-open] .nav-toggle__line:nth-child(2) {
    opacity: 0;
  }

  .site-header[data-open] .nav-toggle__line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

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

@media (max-width: 640px) {
  body::before,
  body::after {
    width: 4px;
  }

  .header__inner {
    gap: 10px;
    padding-inline: 10px;
  }

  .header-actions {
    gap: 6px;
  }

  .header-search-link {
    width: 40px;
    height: 40px;
    padding: 0;
    justify-content: center;
    border-radius: 50%;
  }

  .header-search-link__label {
    display: none;
  }

  .header-search-link::before {
    content: "⌕";
    font-size: 18px;
    line-height: 1;
  }

  .quick-link {
    padding: 7px 9px;
    font-size: 13px;
  }

  .quick-link--hot::after {
    display: none;
  }

  .brand__sub {
    display: none;
  }

  .brand__name {
    font-size: 18px;
  }

  .nav-toggle__text {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (min-width: 1025px) {
  .nav-toggle {
    display: none;
  }
}

@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;
  }

  .js [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }

  .card:hover {
    transform: none;
  }
}