:root {
  --color-navy: #0A1F44;
  --color-gold: #D4AF37;
  --color-gold-light: #F5E7A3;
  --color-red: #8B0000;
  --color-green: #0F2A1D;
  --color-cyan: #00D4FF;
  --color-slate: #7B8CA6;
  --color-white: #FFFFFF;
  --gradient-primary: linear-gradient(135deg, #0A1F44 0%, #0F2A1D 100%);
  --gradient-gold: linear-gradient(135deg, #D4AF37 0%, #F5E7A3 100%);
  --header-width: 280px;
  --header-height-mobile: 64px;
  --content-width: 1220px;
  --font-display: "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Microsoft YaHei", sans-serif;
  --ease: cubic-bezier(.22,.61,.36,1);
  --body-size: 1rem;
  --line-height: 1.6;
  --letter-spacing: 0.02em;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--gradient-primary);
  color: var(--color-white);
  font-family: var(--font-body);
  font-size: var(--body-size);
  line-height: var(--line-height);
  letter-spacing: var(--letter-spacing);
  padding-left: var(--header-width);
  -webkit-font-smoothing: antialiased;
  transition: background .3s var(--ease);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(circle at 18% 8%, rgba(0, 212, 255, .12), transparent 32%),
    radial-gradient(circle at 80% 70%, rgba(212, 175, 55, .08), transparent 28%),
    linear-gradient(135deg, #0A1F44 0%, #0A1D1A 45%, #0F2A1D 100%);
}

body.nav-lock {
  overflow: hidden;
}

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

a {
  color: var(--color-cyan);
}

:focus-visible {
  outline: 3px solid var(--color-cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

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

#main-content {
  display: block;
  min-height: 70vh;
}

/* 跳转链接 */
.skip-link {
  position: fixed;
  top: -100px;
  left: 12px;
  z-index: 300;
  padding: 12px 20px;
  background: var(--color-cyan);
  color: var(--color-navy);
  font-weight: 900;
  text-decoration: none;
  border-radius: 0 0 12px 12px;
  box-shadow: 0 8px 30px rgba(0, 212, 255, .25);
  transition: top .2s var(--ease);
}

.skip-link:focus {
  top: 0;
}

/* 头部左轨导航 */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--header-width);
  z-index: 100;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: rgba(7, 18, 38, .86);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  border-right: 1px solid rgba(212, 175, 55, .22);
  box-shadow: 8px 0 40px rgba(0, 0, 0, .25);
}

.site-header__inner {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  padding: 28px 20px 20px;
}

.site-header__top {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

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

.site-brand__mark {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: linear-gradient(135deg, #f5e7a3 0%, #D4AF37 60%, #b8860b 100%);
  color: var(--color-navy);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.05rem;
  letter-spacing: .04em;
  box-shadow: 0 0 28px rgba(212, 175, 55, .35);
}

.site-brand__content {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.site-brand__name {
  font-weight: 900;
  font-size: 1.25rem;
  letter-spacing: .08em;
  color: var(--color-white);
}

.site-brand__badge {
  align-self: flex-start;
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--color-gold-light);
  border: 1px solid rgba(212, 175, 55, .45);
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(212, 175, 55, .08);
}

.nav-toggle {
  display: none;
}

.site-nav {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  margin-top: 40px;
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.nav-list__item {
  margin: 0;
}

.nav-list__link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 48px;
  padding: 0 14px 0 18px;
  border-radius: 0 14px 14px 0;
  border-left: 2px solid transparent;
  color: rgba(255, 255, 255, .82);
  text-decoration: none;
  font-weight: 600;
  font-size: .98rem;
  transition:
    color .3s var(--ease),
    background .3s var(--ease),
    border-color .3s var(--ease);
}

.nav-list__link::before {
  content: "";
  position: absolute;
  left: -2px;
  top: 30%;
  bottom: 30%;
  width: 2px;
  background: var(--color-cyan);
  transform: scaleY(0);
  transition: transform .3s var(--ease);
}

.nav-list__link::after {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  margin-left: auto;
  background: transparent;
  box-shadow: 0 0 0 transparent;
  transition:
    background .3s var(--ease),
    box-shadow .3s var(--ease);
}

.nav-list__index {
  font-size: .7rem;
  font-weight: 800;
  letter-spacing: .08em;
  color: var(--color-slate);
  transition: color .3s var(--ease);
}

.nav-list__link:hover {
  color: var(--color-white);
  background: rgba(255, 255, 255, .04);
}

.nav-list__link:hover::before {
  transform: scaleY(1);
}

.nav-list__link:hover .nav-list__index {
  color: var(--color-cyan);
}

.nav-list__link[aria-current="page"] {
  color: var(--color-gold);
  background: linear-gradient(90deg, rgba(212, 175, 55, .2), rgba(212, 175, 55, .04));
}

.nav-list__link[aria-current="page"]::before {
  transform: scaleY(1);
  background: var(--color-gold);
}

.nav-list__link[aria-current="page"]::after {
  background: var(--color-gold);
  box-shadow: 0 0 12px var(--color-gold);
}

.nav-list__link[aria-current="page"] .nav-list__index {
  color: var(--color-gold);
}

.nav-aside {
  margin-top: auto;
  border-top: 1px solid rgba(255, 255, 255, .1);
  padding-top: 18px;
}

.nav-aside__kicker {
  font-size: .7rem;
  font-weight: 800;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--color-cyan);
  margin: 0 0 6px;
}

.nav-aside__text {
  font-size: .8rem;
  color: var(--color-slate);
  line-height: 1.6;
  margin: 0 0 14px;
}

.nav-aside__pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: .72rem;
  color: var(--color-gold-light);
  background: rgba(212, 175, 55, .08);
  border: 1px solid rgba(212, 175, 55, .3);
  padding: 5px 10px;
  border-radius: 999px;
  margin: 0;
}

.nav-aside__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-cyan);
  box-shadow: 0 0 8px var(--color-cyan);
}

/* 阅读进度 */
.scroll-progress {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 2px;
  background: rgba(255, 255, 255, .08);
  z-index: 2;
}

.scroll-progress__fill {
  display: block;
  width: 100%;
  height: 0%;
  background: linear-gradient(180deg, var(--color-gold), var(--color-cyan));
  box-shadow: 0 0 12px rgba(212, 175, 55, .5);
}

/* 移动端头部与抽屉导航 */
@media (max-width: 920px) {
  body {
    padding-left: 0;
    padding-top: var(--header-height-mobile);
  }

  .site-header {
    top: 0;
    right: 0;
    bottom: auto;
    width: auto;
    height: var(--header-height-mobile);
    overflow: visible;
    background: rgba(7, 18, 38, .9);
    border-right: 0;
    border-bottom: 1px solid rgba(212, 175, 55, .25);
  }

  .site-header__inner {
    display: flex;
    flex-direction: row;
    align-items: center;
    padding: 0 16px;
  }

  .site-header__top {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    width: 100%;
  }

  .site-brand__mark {
    width: 38px;
    height: 38px;
    font-size: .9rem;
    border-radius: 10px;
  }

  .site-brand__name {
    font-size: 1.05rem;
  }

  .site-brand__badge {
    font-size: .6rem;
  }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    min-height: 40px;
    padding: 0 10px;
    background: transparent;
    border: 1px solid rgba(255, 255, 255, .15);
    border-radius: 12px;
    color: var(--color-white);
    cursor: pointer;
  }

  .nav-toggle__box {
    display: grid;
    gap: 4px;
    width: 18px;
  }

  .nav-toggle__bar {
    height: 2px;
    background: var(--color-gold);
    border-radius: 2px;
    transition: transform .3s var(--ease), opacity .3s var(--ease);
  }

  .nav-toggle__label {
    font-size: .75rem;
    color: var(--color-slate);
  }

  .site-nav {
    position: absolute;
    top: var(--header-height-mobile);
    left: 0;
    right: 0;
    max-height: 0;
    overflow: hidden;
    margin: 0;
    background: linear-gradient(180deg, #0A1F44 0%, #0F2A1D 100%);
    border-bottom: 1px solid rgba(212, 175, 55, .3);
    box-shadow: 0 18px 40px rgba(0, 0, 0, .35);
    visibility: hidden;
    transition:
      max-height .45s var(--ease),
      visibility 0s linear .45s;
  }

  .site-nav[data-open] {
    max-height: calc(100vh - var(--header-height-mobile));
    overflow-y: auto;
    visibility: visible;
    transition:
      max-height .45s var(--ease),
      visibility 0s;
  }

  .nav-list {
    padding: 16px;
  }

  .nav-aside {
    margin: 8px 16px 16px;
  }

  .scroll-progress {
    top: auto;
    right: auto;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 2px;
    background: rgba(255, 255, 255, .1);
  }

  .scroll-progress__fill {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, var(--color-gold), var(--color-cyan));
  }
}

/* 页脚 */
.site-footer {
  position: relative;
  z-index: 1;
  background: linear-gradient(180deg, rgba(10, 31, 68, .96), rgba(15, 42, 29, .98));
  border-top: 1px solid rgba(212, 175, 55, .22);
}

.site-footer__inner {
  width: min(100% - 40px, var(--content-width));
  margin-inline: auto;
  padding: 56px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
  gap: 40px;
}

.footer-brand__mark {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: var(--gradient-gold);
  color: var(--color-navy);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: .95rem;
  margin: 0 0 14px;
  box-shadow: 0 0 24px rgba(212, 175, 55, .3);
}

.footer-brand__name {
  font-size: 1.4rem;
  font-weight: 900;
  letter-spacing: .06em;
  margin: 0 0 6px;
  color: var(--color-white);
}

.footer-brand__desc {
  font-size: .85rem;
  color: var(--color-slate);
  margin: 0 0 16px;
}

.footer-trust {
  font-size: .78rem;
  color: var(--color-slate);
  border-left: 3px solid var(--color-gold);
  padding-left: 12px;
  margin: 0;
  line-height: 1.7;
}

.footer-nav__title {
  color: var(--color-gold);
  font-size: .9rem;
  font-weight: 800;
  letter-spacing: .05em;
  margin: 0 0 14px;
}

.footer-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.footer-nav__link {
  color: var(--color-slate);
  text-decoration: none;
  font-size: .9rem;
  transition:
    color .2s var(--ease),
    padding-left .2s var(--ease);
}

.footer-nav__link:hover {
  color: var(--color-gold);
  padding-left: 4px;
}

.footer-nav__link--legacy {
  color: var(--color-cyan);
}

.footer-nav__link--legacy:hover {
  color: var(--color-gold-light);
}

.footer-contact__line {
  margin: 0 0 10px;
  color: var(--color-slate);
  font-size: .88rem;
}

.footer-contact__line--address {
  max-width: 28em;
}

.footer-contact__note {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid rgba(255, 255, 255, .08);
  color: var(--color-cyan);
  font-size: .75rem;
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  align-items: center;
  justify-content: space-between;
  margin-top: 48px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, .1);
  color: var(--color-slate);
  font-size: .8rem;
}

.footer-icp {
  color: var(--color-slate);
  letter-spacing: .08em;
}

@media (max-width: 920px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .site-footer__inner {
    padding-top: 40px;
  }
}

@media (max-width: 600px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

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

/* 通用布局 */
.container {
  width: min(100% - 48px, var(--content-width));
  margin-inline: auto;
}

.section {
  position: relative;
  padding-block: clamp(56px, 8vw, 96px);
}

.section--tight {
  padding-block: 32px;
}

.section-head {
  max-width: 760px;
  margin-bottom: 40px;
}

.eyebrow {
  font-size: .75rem;
  font-weight: 800;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--color-cyan);
  margin: 0 0 8px;
}

.section-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.8rem, 4vw, 3rem);
  line-height: 1.15;
  margin: 8px 0 12px;
  color: var(--color-white);
}

.lead {
  font-size: 1.05rem;
  color: var(--color-slate);
  margin: 0;
}

.prose {
  max-width: 72ch;
  color: #D6E1F0;
}

.prose p {
  margin: 0 0 1.2em;
}

.prose a {
  color: var(--color-cyan);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.prose h2,
.prose h3 {
  color: var(--color-white);
}

/* 图片容器基础 */
.media {
  position: relative;
  width: 100%;
  border-radius: 16px;
  overflow: hidden;
  background: linear-gradient(145deg, rgba(255, 255, 255, .08), rgba(255, 255, 255, .02));
  border: 1px solid rgba(255, 255, 255, .12);
}

.media--16x9 {
  aspect-ratio: 16 / 9;
}

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

.media--wide {
  aspect-ratio: 21 / 9;
}

.media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media__placeholder {
  display: grid;
  place-items: center;
  min-height: 220px;
  height: 100%;
  color: var(--color-slate);
  font-size: .85rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  background:
    radial-gradient(circle at 30% 40%, rgba(0, 212, 255, .1), transparent 32%),
    radial-gradient(circle at 70% 80%, rgba(212, 175, 55, .08), transparent 30%);
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  list-style: none;
  padding: 0;
  margin: 0 0 24px;
  color: var(--color-slate);
  font-size: .85rem;
}

.breadcrumb__item {
  margin: 0;
}

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: .5rem;
  color: rgba(255, 255, 255, .2);
}

.breadcrumb__link {
  color: var(--color-slate);
  text-decoration: none;
}

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

.breadcrumb__current {
  color: var(--color-gold);
}

/* 卡片 */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.card {
  position: relative;
  background: linear-gradient(145deg, rgba(255, 255, 255, .1), rgba(255, 255, 255, .03));
  border: 1px solid rgba(255, 255, 255, .12);
  border-radius: 20px;
  padding: 24px;
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  transition:
    transform .3s var(--ease),
    border-color .3s var(--ease),
    box-shadow .3s var(--ease);
}

.card:hover {
  transform: translateY(-4px);
  border-color: rgba(212, 175, 55, .5);
  box-shadow: 0 16px 40px rgba(0, 0, 0, .3);
}

.card--accent {
  border-top: 3px solid var(--color-gold);
}

.card__title {
  font-size: 1.15rem;
  font-weight: 900;
  margin: 0 0 8px;
  color: var(--color-white);
}

.card__text {
  color: var(--color-slate);
  margin: 0;
}

@media (max-width: 920px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .card-grid {
    grid-template-columns: 1fr;
  }
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .6rem;
  min-height: 46px;
  padding: .8rem 1.6rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition:
    transform .3s var(--ease),
    box-shadow .3s var(--ease),
    background .3s var(--ease),
    border-color .3s var(--ease);
}

.btn--primary {
  background: linear-gradient(135deg, var(--color-gold), var(--color-gold-light));
  color: var(--color-navy);
  box-shadow: 0 8px 30px rgba(212, 175, 55, .25);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 36px rgba(212, 175, 55, .35);
}

.btn--ghost {
  border-color: rgba(0, 212, 255, .4);
  color: var(--color-cyan);
  background: rgba(0, 212, 255, .06);
}

.btn--ghost:hover {
  background: rgba(0, 212, 255, .12);
  transform: translateY(-2px);
}

.btn--dark {
  background: rgba(10, 31, 68, .85);
  border-color: rgba(255, 255, 255, .16);
  color: var(--color-white);
}

.btn--dark:hover {
  border-color: rgba(212, 175, 55, .5);
  color: var(--color-gold);
  transform: translateY(-2px);
}

/* 页面首屏 */
.page-hero {
  padding: clamp(72px, 10vw, 120px) 0 48px;
}

.page-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 6vw, 4.5rem);
  line-height: .95;
  letter-spacing: -0.02em;
  margin: 12px 0 16px;
  color: var(--color-white);
}

.page-hero__lead {
  max-width: 640px;
  color: var(--color-slate);
  font-size: 1.1rem;
  margin: 0;
}

.page-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.meta-pill {
  font-size: .75rem;
  border: 1px solid rgba(212, 175, 55, .35);
  color: var(--color-gold-light);
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(212, 175, 55, .08);
}

/* 警示与说明 */
.notice {
  padding: 16px 18px;
  border-radius: 14px;
  border-left: 4px solid var(--color-red);
  background: linear-gradient(135deg, rgba(139, 0, 0, .22), rgba(139, 0, 0, .06));
  color: var(--color-white);
}

.notice--gold {
  border-left-color: var(--color-gold);
  background: linear-gradient(135deg, rgba(212, 175, 55, .2), rgba(212, 175, 55, .04));
}

/* 章节高亮辅助 */
.spy-link {
  color: var(--color-slate);
  text-decoration: none;
  transition: color .25s var(--ease);
}

.spy-link[data-active] {
  color: var(--color-gold);
}

/* 减少动态 */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }

  .site-nav {
    transition: max-height .2s linear, visibility 0s;
  }
}