:root {
  --c-deep: #0A1F44;
  --c-deep-alt: #0E2854;
  --c-gold: #D4AF37;
  --c-gold-bright: #F2D06B;
  --c-red: #E63946;
  --c-off: #F4F6FA;
  --c-slate: #8892A6;
  --c-white: #FFFFFF;
  --glass-face: rgba(10, 31, 68, 0.72);
  --glass-border: rgba(212, 175, 55, 0.35);
  --font-display: "Oswald", "DIN Alternate", "Arial Narrow", "Helvetica Neue", sans-serif;
  --font-body: "Roboto", "Noto Sans SC", -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", "Menlo", "Consolas", monospace;
  --nav-h: 72px;
  --nav-h-mobile: 62px;
  --container: 1280px;
  --gutter: clamp(16px, 4vw, 40px);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --display-max: 76px;
  --hero-max: 58px;
}

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

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

body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--c-off);
  background-color: var(--c-deep);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  line-height: 1.2;
  font-weight: 700;
}

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

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

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

ul, ol {
  padding: 0;
}

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

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

/* ========== 跳转与进度 ========== */

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 1400;
  background: var(--c-gold);
  color: var(--c-deep);
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 14px;
  padding: 10px 16px;
  border-radius: 2px;
  transform: translateY(-220%);
  transition: transform 0.2s var(--ease);
}

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

.site-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  z-index: 1301;
  pointer-events: none;
  background: transparent;
}

.site-progress span {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--c-gold) 0%, var(--c-red) 100%);
  transition: width 0.15s var(--ease);
}

/* ========== 头部 ========== */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1300;
  height: var(--nav-h);
  background: transparent;
  border-bottom: 1px solid rgba(212, 175, 55, 0.18);
  transition: background-color 0.35s var(--ease), border-color 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

.site-header.is-scrolled {
  background: rgba(10, 31, 68, 0.92);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom-color: var(--glass-border);
  box-shadow: 0 8px 30px rgba(2, 8, 22, 0.35);
}

.site-header__inner {
  max-width: var(--container);
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-height: 44px;
  flex: 0 0 auto;
}

.site-header__brand-mark {
  position: relative;
  display: block;
  width: 16px;
  height: 16px;
  border: 2px solid var(--c-gold);
  transform: rotate(45deg);
  flex: 0 0 auto;
  transition: transform 0.3s var(--ease);
}

.site-header__brand-mark::before {
  content: "";
  position: absolute;
  inset: 3px;
  background: var(--c-red);
}

.site-header__brand:hover .site-header__brand-mark {
  transform: rotate(135deg);
}

.site-header__brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
}

.site-header__brand-cn {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--c-white);
}

.site-header__brand-en {
  font-family: var(--font-display);
  font-size: 10px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--c-gold);
}

/* ========== 导航 ========== */

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(4px, 1.2vw, 22px);
  list-style: none;
}

.site-nav__link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 6px;
  padding: 10px 4px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.02em;
  white-space: nowrap;
  color: rgba(244, 246, 250, 0.86);
  text-decoration: none;
  transition: color 0.2s, text-shadow 0.2s;
}

.site-nav__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--c-gold);
  opacity: 0.85;
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 4px;
  right: 4px;
  bottom: 2px;
  height: 2px;
  background: var(--c-red);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s var(--ease);
}

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

.site-nav__link:hover::after,
.site-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
}

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

.site-nav__link[aria-current="page"]::before {
  content: "";
  position: absolute;
  top: 6px;
  right: -4px;
  width: 6px;
  height: 6px;
  background: var(--c-red);
  transform: rotate(45deg);
}

.site-nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  background: rgba(10, 31, 68, 0.5);
  border: 1px solid var(--glass-border);
  color: var(--c-white);
  font-family: var(--font-body);
  font-size: 12px;
  cursor: pointer;
}

.site-nav-toggle__bars {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 18px;
}

.site-nav-toggle__bar {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--c-gold);
  transition: transform 0.25s var(--ease), opacity 0.2s;
}

.site-nav-toggle__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--c-gold);
}

.site-nav-toggle.is-active .site-nav-toggle__bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.site-nav-toggle.is-active .site-nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.site-nav-toggle.is-active .site-nav-toggle__bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* ========== 页脚 ========== */

.site-footer {
  position: relative;
  background: var(--c-deep);
  border-top: 1px solid var(--glass-border);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--c-red) 0 64px, var(--c-gold) 64px 120px, transparent 120px);
}

.site-footer__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: clamp(48px, 6vw, 80px) var(--gutter) 24px;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: clamp(32px, 5vw, 80px);
}

.site-footer__brand-name {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--c-white);
}

.site-footer__brand-name::before {
  content: "";
  display: inline-block;
  width: 9px;
  height: 9px;
  margin-right: 8px;
  background: var(--c-red);
  transform: rotate(45deg);
}

.site-footer__brand-name span {
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--c-gold);
  margin-left: 12px;
}

.site-footer__statement {
  margin-top: 16px;
  max-width: 44ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-slate);
}

.site-footer__contact {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-style: normal;
}

.site-footer__contact-row {
  font-size: 13px;
  color: var(--c-slate);
}

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

.site-footer__contact-row a:hover {
  color: var(--c-gold-bright);
}

.site-footer__cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.site-footer__heading {
  display: block;
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-gold);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(212, 175, 55, 0.18);
}

.site-footer__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.site-footer__link {
  font-size: 14px;
  color: rgba(244, 246, 250, 0.72);
  transition: color 0.2s, padding-left 0.2s;
}

.site-footer__link:hover {
  color: var(--c-gold-bright);
  padding-left: 4px;
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 22px;
  margin-top: clamp(36px, 5vw, 56px);
  padding-top: 18px;
  border-top: 1px solid rgba(244, 246, 250, 0.1);
}

.site-footer__meta {
  font-size: 12px;
  color: var(--c-slate);
}

.site-footer__bottom a.site-footer__meta:hover {
  color: var(--c-gold-bright);
}

/* ========== 容器与章节 ========== */

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding-inline: var(--gutter);
}

.section {
  padding: clamp(64px, 9vw, 116px) var(--gutter);
}

.section--alt {
  background: var(--c-deep-alt);
}

.section--pale {
  background: var(--c-off);
  color: var(--c-deep);
}

.section__inner {
  max-width: var(--container);
  margin: 0 auto;
}

/* ========== 网格 ========== */

.grid {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
}

.grid--73 {
  grid-template-columns: 7fr 3fr;
}

.grid--53 {
  grid-template-columns: 5fr 3fr;
}

.grid--50 {
  grid-template-columns: 1fr 1fr;
}

.grid--33 {
  grid-template-columns: repeat(3, 1fr);
}

.grid--24 {
  grid-template-columns: 2fr 4fr;
}

/* ========== 标题与索引 ========== */

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--c-gold);
}

.eyebrow::before {
  content: "";
  width: 8px;
  height: 8px;
  flex: 0 0 auto;
  background: var(--c-red);
  transform: rotate(45deg);
}

.eyebrow--on-pale {
  color: var(--c-deep);
}

.eyebrow--on-pale::before {
  background: var(--c-red);
}

.display-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(40px, 7.5vw, var(--display-max));
  line-height: 1.08;
  letter-spacing: 0.02em;
  color: var(--c-white);
}

.display-title em {
  font-style: normal;
  color: var(--c-gold);
}

.display-title--pale {
  color: var(--c-deep);
}

/* ========== 内页头图与面包屑 ========== */

.page-hero {
  position: relative;
  padding: calc(var(--nav-h) + clamp(40px, 6vw, 72px)) var(--gutter) clamp(40px, 6vw, 72px);
  background-color: var(--c-deep);
  overflow: hidden;
}

.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(115deg, rgba(212, 175, 55, 0.08) 0 1px, transparent 1px 18px), linear-gradient(25deg, rgba(212, 175, 55, 0.05) 0 1px, transparent 1px 24px);
}

.page-hero::after {
  content: "";
  position: absolute;
  right: -120px;
  top: 24px;
  width: 280px;
  height: 280px;
  border: 1px solid rgba(212, 175, 55, 0.16);
  transform: rotate(45deg);
}

.page-hero__inner {
  position: relative;
  z-index: 1;
  max-width: var(--container);
  margin: 0 auto;
}

.page-hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(36px, 5.5vw, var(--hero-max));
  line-height: 1.08;
  letter-spacing: 0.02em;
  color: var(--c-white);
}

.page-hero__lead {
  max-width: 56ch;
  margin-top: 18px;
  font-size: 17px;
  color: rgba(244, 246, 250, 0.78);
}

.breadcrumb {
  position: relative;
  z-index: 1;
  max-width: var(--container);
  margin: 0 auto;
  padding: calc(var(--nav-h) + 20px) var(--gutter) 0;
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  font-size: 13px;
  color: var(--c-slate);
}

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

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

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

.breadcrumb__sep {
  font-family: var(--font-mono);
  color: var(--c-gold);
  opacity: 0.6;
}

.breadcrumb__current {
  color: var(--c-off);
}

/* ========== 按钮 ========== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 26px;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-white);
  background: transparent;
  border: 1px solid var(--c-gold);
  cursor: pointer;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
  transition: background-color 0.25s, color 0.25s, border-color 0.25s, transform 0.25s var(--ease);
}

.btn:hover {
  transform: translate(-2px, -2px);
}

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

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

.btn--red {
  background: var(--c-red);
  border-color: var(--c-red);
  color: var(--c-white);
}

.btn--red:hover {
  background: #d92b39;
  border-color: #d92b39;
}

.btn--ghost {
  border-color: var(--glass-border);
  color: var(--c-off);
}

.btn--ghost:hover {
  border-color: var(--c-gold);
  background: rgba(212, 175, 55, 0.08);
}

.btn--sm {
  padding: 9px 16px;
  font-size: 12px;
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
}

/* ========== 卡片与媒体 ========== */

.glass-card {
  padding: clamp(20px, 3vw, 32px);
  background: var(--glass-face);
  border: 1px solid var(--glass-border);
  border-radius: 2px;
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}

.glass-card__title {
  font-family: var(--font-display);
  font-size: 22px;
  letter-spacing: 0.04em;
  color: var(--c-white);
  margin-bottom: 10px;
}

.image-frame {
  position: relative;
  overflow: hidden;
  background: var(--c-deep-alt);
  border: 1px solid var(--glass-border);
}

.image-frame--16x10 {
  aspect-ratio: 16 / 10;
}

.image-frame--4x3 {
  aspect-ratio: 4 / 3;
}

.image-frame--1x1 {
  aspect-ratio: 1 / 1;
}

.image-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.7s var(--ease);
}

.image-frame:hover img {
  transform: scale(1.04);
}

.image-frame__caption {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
  font-size: 12px;
  color: var(--c-slate);
}

.image-frame__caption::before {
  content: "▍";
  color: var(--c-gold);
}

.diag-bar {
  display: block;
  width: 64px;
  height: 6px;
  background: linear-gradient(90deg, var(--c-red), var(--c-gold));
  transform: skewX(-24deg);
}

.diag-bar--sm {
  width: 40px;
  height: 4px;
}

/* ========== 数据与正文 ========== */

.stat {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.1;
  color: var(--c-gold);
}

.stat__label {
  display: block;
  margin-top: 6px;
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-slate);
}

.stat--pale {
  color: var(--c-deep);
}

.prose {
  max-width: 68ch;
}

.prose h2 {
  margin: 2.2em 0 0.7em;
  font-family: var(--font-display);
  font-size: 24px;
  letter-spacing: 0.04em;
  color: inherit;
}

.prose h2::before {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-right: 10px;
  background: var(--c-red);
  transform: rotate(45deg);
}

.prose p {
  margin-bottom: 1.4em;
}

.prose ul,
.prose ol {
  margin: 0 0 1.4em 1.4em;
}

.prose li {
  margin-bottom: 0.5em;
}

.prose a {
  color: var(--c-gold);
  text-decoration: underline;
  text-decoration-color: rgba(212, 175, 55, 0.4);
  text-underline-offset: 3px;
}

.prose--pale a {
  color: var(--c-deep);
  text-decoration-color: rgba(10, 31, 68, 0.4);
}

/* ========== 滚动显现 ========== */

@media (prefers-reduced-motion: no-preference) {
  .js-ok [data-reveal] {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.65s var(--ease), transform 0.65s var(--ease);
    transition-delay: var(--reveal-delay, 0ms);
    will-change: opacity, transform;
  }

  .js-ok [data-reveal="fade"] {
    transform: none;
  }

  .js-ok [data-reveal="left"] {
    transform: translateX(-30px);
  }

  .js-ok [data-reveal="right"] {
    transform: translateX(30px);
  }

  .js-ok [data-reveal="scale"] {
    transform: scale(0.94);
  }

  .js-ok [data-reveal].is-inview {
    opacity: 1;
    transform: none;
  }
}

/* ========== 响应式 ========== */

@media (max-width: 880px) {
  .site-header {
    height: var(--nav-h-mobile);
  }

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

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(10, 31, 68, 0.97);
    border-bottom: 1px solid var(--glass-border);
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    transition: max-height 0.4s var(--ease), visibility 0s linear 0.4s;
  }

  .site-nav[data-open="true"] {
    max-height: min(540px, calc(100vh - var(--nav-h-mobile)));
    overflow-y: auto;
    visibility: visible;
    transition: max-height 0.4s var(--ease), visibility 0s linear 0s;
  }

  .site-nav__list {
    flex-direction: column;
    gap: 0;
    padding: 8px var(--gutter) 20px;
  }

  .site-nav__item {
    width: 100%;
    border-bottom: 1px solid rgba(136, 146, 166, 0.16);
  }

  .site-nav__item:last-child {
    border-bottom: 0;
  }

  .site-nav__link {
    padding: 14px 4px;
    font-size: 17px;
    white-space: normal;
  }

  .site-nav__num {
    font-size: 12px;
  }

  .grid--73,
  .grid--53,
  .grid--50,
  .grid--33,
  .grid--24 {
    grid-template-columns: 1fr;
  }

  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

@media (max-width: 640px) {
  .site-footer__cols {
    grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
  }
}

/* ========== 减弱动效 ========== */

@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;
  }
}