:root {
  --color-deep: #0A1E3F;
  --color-gold: #D4A017;
  --color-green: #2ECC71;
  --color-night: #1A2A4A;
  --color-silver: #B0B8C8;
  --color-white: #FFFFFF;
  --color-bronze: #B8860B;
  --color-red: #E74C3C;
  --font-heading: "Source Han Sans Heavy", "Noto Sans CJK SC", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  --font-body: "Inter", "PingFang SC", "Microsoft YaHei", "Segoe UI", Arial, sans-serif;
  --font-mono: "Roboto Mono", "Cascadia Mono", "SF Mono", Consolas, "Liberation Mono", monospace;
  --container-max: 1280px;
  --header-height: 72px;
}

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

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

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--color-deep);
  color: var(--color-white);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  word-break: break-word;
  overflow-wrap: break-word;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 0.5em;
  font-family: var(--font-heading);
  font-weight: 900;
  line-height: 1.15;
  color: var(--color-white);
}

h1 { font-size: clamp(44px, 6vw, 64px); line-height: 1.05; }
h2 { font-size: clamp(30px, 4vw, 40px); line-height: 1.1; }
h3 { font-size: clamp(22px, 2vw, 28px); }
h4 { font-size: clamp(18px, 1.8vw, 20px); font-weight: 700; }

p { margin: 0 0 1em; }
ul, ol { margin: 0; padding-left: 1.2em; }
a { color: var(--color-gold); text-decoration: none; transition: color 0.25s ease; }
a:hover { color: var(--color-bronze); }
img, video, canvas { max-width: 100%; display: block; }

::selection {
  background: var(--color-gold);
  color: var(--color-deep);
}

:focus-visible {
  outline: 2px solid var(--color-gold);
  outline-offset: 3px;
}

#main-content {
  scroll-margin-top: calc(var(--header-height) + 12px);
}

.container {
  width: 100%;
  max-width: calc(var(--container-max) + 48px);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

.grid {
  display: grid;
  gap: 24px;
}
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

@media (max-width: 1024px) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 600px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
}

.main-content {
  position: relative;
  z-index: 1;
  flex: 1 0 auto;
  min-height: 70vh;
}

.section-head {
  margin-bottom: 32px;
}
.section-head--compact { margin-bottom: 20px; }

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.25em;
  color: var(--color-gold);
  text-transform: uppercase;
  margin-bottom: 12px;
}
.section-label__index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 28px;
  padding: 0 8px;
  background: var(--color-gold);
  color: var(--color-deep);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
}
.section-label::after {
  content: "";
  width: 36px;
  height: 2px;
  background: currentColor;
}

.section-title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(32px, 4.5vw, 48px);
  line-height: 1.1;
  margin: 0 0 8px;
  color: var(--color-white);
  letter-spacing: 0.02em;
}

.section-subtitle {
  max-width: 640px;
  color: var(--color-silver);
  font-size: 16px;
  line-height: 1.7;
}

.over-num {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.2em;
  color: var(--color-gold);
}

.slash {
  display: inline-block;
  width: 24px;
  height: 2px;
  margin: 0 10px;
  background: var(--color-gold);
  transform: skewX(-42deg);
  vertical-align: middle;
}

.route-line {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 8px 0 32px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: rgba(176, 184, 200, 0.4);
}
.route-line::before {
  content: "";
  height: 1px;
  flex: 1;
  background: linear-gradient(90deg, transparent, rgba(212, 160, 23, 0.5));
}
.route-line::after {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--color-gold);
  transform: rotate(45deg);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 24px;
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 900;
  letter-spacing: 0.1em;
  color: var(--color-white);
  background: transparent;
  border: 2px solid var(--color-silver);
  border-radius: 0;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.25s ease, color 0.25s ease, border-color 0.25s ease, clip-path 0.25s ease;
}
.btn:hover {
  border-color: var(--color-gold);
  color: var(--color-gold);
}
.btn:active {
  transform: translateY(1px);
}
.btn--gold {
  background: var(--color-gold);
  border-color: var(--color-gold);
  color: var(--color-deep);
}
.btn--gold:hover {
  background: transparent;
  border-color: var(--color-gold);
  color: var(--color-gold);
}
.btn--green {
  background: var(--color-green);
  border-color: var(--color-green);
  color: var(--color-deep);
}
.btn--green:hover {
  background: transparent;
  border-color: var(--color-green);
  color: var(--color-green);
}
.btn--ghost {
  border-color: var(--color-silver);
  color: var(--color-white);
}
.btn--ghost:hover {
  border-color: var(--color-gold);
  color: var(--color-gold);
}
.btn--block {
  display: flex;
  width: 100%;
}
.btn--cut {
  -webkit-clip-path: polygon(10px 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
  clip-path: polygon(10px 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
}
.btn--cut:hover {
  -webkit-clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
  clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 2px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  border: 1px solid;
  white-space: nowrap;
}
.tag--gold { color: var(--color-gold); border-color: rgba(212, 160, 23, 0.5); }
.tag--green { color: var(--color-green); border-color: rgba(46, 204, 113, 0.5); }
.tag--red { color: var(--color-red); border-color: rgba(231, 76, 60, 0.5); }
.tag--silver { color: var(--color-silver); border-color: rgba(176, 184, 200, 0.4); }

.panel {
  background: var(--color-night);
  border: 1px solid rgba(176, 184, 200, 0.14);
  padding: 28px;
  position: relative;
  transition: border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
}
.panel--topline {
  border-top: 3px solid var(--color-gold);
}
.panel--cut::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 22px;
  height: 22px;
  border-top: 3px solid var(--color-gold);
  border-left: 3px solid var(--color-gold);
  pointer-events: none;
}
.panel--hover:hover {
  border-color: rgba(212, 160, 23, 0.4);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.25);
  transform: translateY(-2px);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 16px 0;
  font-size: 14px;
  color: var(--color-silver);
}
.breadcrumb__sep {
  opacity: 0.5;
}
.breadcrumb a {
  color: var(--color-silver);
  transition: color 0.2s ease;
}
.breadcrumb a:hover {
  color: var(--color-gold);
}
.breadcrumb__current {
  color: var(--color-gold);
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  padding: 16px 0;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-silver);
  letter-spacing: 0.05em;
}
.legend__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.legend__dot {
  width: 10px;
  height: 10px;
  flex: none;
  transform: rotate(45deg);
}
.legend__dot--gold { background: var(--color-gold); }
.legend__dot--green { background: var(--color-green); }
.legend__dot--red { background: var(--color-red); }
.legend__dot--silver { background: var(--color-silver); }
.legend__key {
  font-size: 13px;
  color: var(--color-white);
}

.visual {
  position: relative;
  overflow: hidden;
  background: var(--color-night);
  border: 1px solid rgba(176, 184, 200, 0.12);
}
.visual--16-9 { aspect-ratio: 16 / 9; }
.visual--4-3 { aspect-ratio: 4 / 3; }
.visual--3-2 { aspect-ratio: 3 / 2; }
.visual--1-1 { aspect-ratio: 1 / 1; }
.visual__thumb {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.15em;
  color: var(--color-silver);
  background:
    repeating-linear-gradient(-45deg, rgba(26, 42, 74, 0.6) 0 10px, rgba(26, 42, 74, 0.1) 10px 20px),
    linear-gradient(135deg, rgba(212, 160, 23, 0.15) 0%, transparent 50%);
}
.visual__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.visual:hover .visual__img {
  transform: scale(1.03);
}

.prose {
  max-width: 780px;
}
.prose p,
.prose ul,
.prose ol {
  margin-bottom: 1.5em;
}
.prose li {
  margin-bottom: 0.5em;
}
.prose h2,
.prose h3,
.prose h4 {
  margin-top: 1.8em;
}

body::before,
body::after {
  content: "";
  position: fixed;
  top: 0;
  bottom: 0;
  width: 1px;
  background: rgba(255, 255, 255, 0.04);
  pointer-events: none;
  z-index: 0;
}
body::before {
  left: 6%;
}
body::after {
  right: 6%;
}
@media (max-width: 600px) {
  body::before,
  body::after {
    display: none;
  }
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 2000;
  padding: 10px 20px;
  background: var(--color-gold);
  color: var(--color-deep);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transform: translateY(-200%);
  transition: transform 0.2s ease;
}
.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: -webkit-sticky;
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10, 30, 63, 0);
  border-bottom: 1px solid rgba(176, 184, 200, 0.12);
  transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease, backdrop-filter 0.3s ease;
}
.site-header.is-scrolled {
  background: rgba(10, 30, 63, 0.92);
  border-bottom-color: rgba(212, 160, 23, 0.3);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.25);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.site-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: 24px;
  height: var(--header-height);
}

.site-header__brand {
  display: flex;
  align-items: center;
  gap: 14px;
  flex: none;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 2px;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 26px;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--color-white);
  text-decoration: none;
}
.brand__main {
  display: inline-flex;
  align-items: baseline;
  gap: 2px;
}
.brand__accent {
  color: var(--color-gold);
}
.brand--footer {
  font-size: 32px;
  text-decoration: none;
}
.brand--footer:hover .brand__accent {
  color: var(--color-bronze);
}

.site-header__tagline {
  display: inline-flex;
  align-items: center;
  padding-left: 14px;
  border-left: 1px solid rgba(176, 184, 200, 0.22);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--color-silver);
  white-space: nowrap;
}

.site-nav {
  margin-left: auto;
}
.site-nav__list {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-nav__item {
  position: relative;
}
.site-nav__link {
  position: relative;
  display: block;
  padding: 12px 14px;
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-silver);
  text-decoration: none;
  transition: color 0.25s ease;
}
.site-nav__link::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 4px;
  height: 2px;
  background: var(--color-gold);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.3s ease;
}
.site-nav__link:hover {
  color: var(--color-white);
}
.site-nav__link:hover::after,
.site-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
}
.site-nav__link[aria-current="page"] {
  color: var(--color-white);
}

.site-header__cta {
  flex: none;
}

.nav-toggle {
  display: none;
  position: relative;
  width: 44px;
  height: 44px;
  padding: 11px;
  background: transparent;
  border: 1px solid rgba(176, 184, 200, 0.3);
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  transition: border-color 0.2s ease;
}
.nav-toggle:hover {
  border-color: var(--color-gold);
}
.nav-toggle__bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-white);
  transition: transform 0.3s ease, opacity 0.3s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 0%;
  height: 2px;
  background: linear-gradient(90deg, var(--color-gold) 0%, var(--color-green) 100%);
  pointer-events: none;
  z-index: 2;
}

.site-footer {
  position: relative;
  z-index: 1;
  background: #07162d;
  border-top: 1px solid rgba(212, 160, 23, 0.28);
  margin-top: auto;
}
.site-footer::before {
  content: "";
  display: block;
  height: 3px;
  background: linear-gradient(90deg, var(--color-gold) 0%, rgba(212, 160, 23, 0.4) 40%, transparent 100%);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr) minmax(0, 1fr);
  gap: 40px;
  padding-top: 48px;
  padding-bottom: 32px;
}

.site-footer__col {
  min-width: 0;
}

.site-footer__summary {
  margin: 16px 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-silver);
}

.site-footer__trust {
  margin: 8px 0 20px;
  padding-left: 12px;
  border-left: 2px solid var(--color-gold);
  font-size: 13px;
  line-height: 1.7;
  color: rgba(176, 184, 200, 0.65);
}

.site-footer__contact-lines {
  display: grid;
  gap: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-silver);
  line-height: 1.6;
}

.site-footer__heading {
  margin: 16px 0 12px;
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 900;
  letter-spacing: 0.15em;
  color: var(--color-gold);
  text-transform: uppercase;
}

.site-footer__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}
.site-footer__list a {
  display: inline-block;
  padding: 2px 0;
  color: var(--color-silver);
  font-size: 15px;
  text-decoration: none;
  transition: color 0.2s ease, transform 0.2s ease;
}
.site-footer__list a:hover {
  color: var(--color-gold);
  transform: translateX(4px);
}

.site-footer__bottom {
  background: rgba(0, 0, 0, 0.25);
  border-top: 1px solid rgba(176, 184, 200, 0.12);
  padding: 16px 0;
}

.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}
.site-footer__legal-text {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--color-silver);
}

@media (max-width: 900px) {
  .site-header__cta {
    display: none;
  }
  .nav-toggle {
    display: inline-flex;
  }
  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    margin-left: 0;
    background: rgba(10, 30, 63, 0.98);
    border-top: 1px solid rgba(212, 160, 23, 0.2);
    border-bottom: 1px solid rgba(212, 160, 23, 0.25);
    padding: 0 24px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, padding 0.35s ease;
  }
  .site-nav[data-open] {
    max-height: 460px;
    padding-top: 12px;
    padding-bottom: 20px;
  }
  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .site-nav__item {
    border-bottom: 1px solid rgba(176, 184, 200, 0.08);
  }
  .site-nav__item:last-child {
    border-bottom: none;
  }
  .site-nav__link {
    padding: 14px 0;
    font-size: 16px;
  }
  .site-nav__link::after {
    left: 0;
    right: auto;
    width: 36px;
    bottom: 12px;
  }

  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: 28px;
    padding-top: 32px;
  }
}

@media (max-width: 600px) {
  :root {
    --header-height: 60px;
  }
  .site-header__inner {
    gap: 12px;
  }
  .site-header__tagline {
    display: none;
  }
  .brand {
    font-size: 22px;
  }
  .brand--footer {
    font-size: 28px;
  }
}

@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;
  }
}