:root {
  --color-primary: #0B3D2E;
  --color-primary-light: #1E5C46;
  --color-gold: #D4AF37;
  --color-gold-deep: #B08D2A;
  --color-black: #111111;
  --color-white: #FFFFFF;
  --color-gray-light: #E5E7EB;
  --color-red-alert: #D0342C;
  --color-muted: rgba(255, 255, 255, 0.66);
  --color-muted-dark: rgba(17, 17, 17, 0.64);
  --font-heading: Impact, "Arial Black", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: Georgia, "Source Serif Pro", "Songti SC", serif;
  --shadow-card: 0 18px 40px rgba(0, 0, 0, 0.18);
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-pill: 999px;
  --header-h: auto;
  --content-max: 1280px;
  --gutter: clamp(1.25rem, 4vw, 3.5rem);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

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

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-white);
  background-color: var(--color-primary);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul,
ol {
  list-style: none;
}

button {
  font: inherit;
  border: none;
  background: none;
  cursor: pointer;
  color: inherit;
}

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

.skip-link {
  position: fixed;
  top: -100px;
  left: 16px;
  z-index: 9999;
  background: var(--color-gold);
  color: var(--color-black);
  font-family: var(--font-heading);
  font-size: 0.875rem;
  letter-spacing: 0.08em;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  transition: top 0.25s var(--ease);
}

.skip-link:focus {
  top: 16px;
}

.site-header {
  position: relative;
  z-index: 100;
  background: linear-gradient(180deg, #0B3D2E 0%, #0E4834 100%);
  border-bottom: 1px solid rgba(212, 175, 55, 0.22);
}

.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0.6rem var(--gutter);
  font-family: var(--font-heading);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--color-muted);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.header-brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  background: var(--color-gold);
  color: var(--color-primary);
  font-family: var(--font-heading);
  font-size: 0.9rem;
  border-radius: 50%;
  flex: 0 0 auto;
}

.header-top-line {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.header-top-dot {
  width: 6px;
  height: 6px;
  background: var(--color-gold);
  border-radius: 50%;
  animation: pulse-dot 2s infinite alternate;
}

@keyframes pulse-dot {
  from {
    opacity: 0.4;
    transform: scale(0.85);
  }
  to {
    opacity: 1;
    transform: scale(1.1);
  }
}

.header-hotline {
  color: var(--color-gold);
  transition: color 0.2s ease;
}

.header-hotline:hover {
  color: var(--color-white);
}

.header-main {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 1.2rem var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  position: relative;
}

.header-brand {
  flex: 0 0 auto;
}

.header-logo {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.logo-cn {
  font-family: var(--font-heading);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--color-white);
  text-transform: uppercase;
}

.logo-en {
  font-family: var(--font-heading);
  font-size: 0.65rem;
  letter-spacing: 0.24em;
  color: var(--color-gold);
  text-transform: uppercase;
  margin-top: 0.3rem;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: 1px solid rgba(212, 175, 55, 0.4);
  border-radius: var(--radius-md);
  background: rgba(212, 175, 55, 0.06);
  transition: background 0.2s ease, border-color 0.2s ease;
}

.nav-toggle-line {
  width: 100%;
  height: 2px;
  background: var(--color-gold);
  border-radius: 2px;
  transition: transform 0.3s var(--ease), opacity 0.2s ease;
}

.nav-toggle:hover {
  background: rgba(212, 175, 55, 0.14);
}

.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);
}

.site-nav {
  display: block;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 0.2rem;
  flex-wrap: wrap;
}

.nav-link {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 1rem;
  letter-spacing: 0.06em;
  color: var(--color-muted);
  padding: 0.6rem 1.1rem;
  border-radius: var(--radius-pill);
  position: relative;
  transition: color 0.25s ease, background 0.25s ease;
}

.nav-link::before {
  content: "";
  position: absolute;
  left: 0.6rem;
  right: auto;
  top: 50%;
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--color-gold);
  opacity: 0;
  transform: translateY(-50%) scale(0);
  transition: opacity 0.25s ease, transform 0.25s var(--ease);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--color-white);
  background: rgba(212, 175, 55, 0.1);
}

.nav-link:hover::before,
.nav-link:focus-visible::before {
  opacity: 1;
  transform: translateY(-50%) scale(1);
}

.nav-link[aria-current="page"] {
  color: var(--color-gold);
  background: rgba(212, 175, 55, 0.12);
  border: 1px solid rgba(212, 175, 55, 0.28);
}

.nav-link[aria-current="page"]::before {
  opacity: 1;
  transform: translateY(-50%) scale(1);
}

.header-bottom {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0.7rem var(--gutter);
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  font-family: var(--font-heading);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: rgba(255, 255, 255, 0.48);
  text-transform: uppercase;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
}

.header-bottom-sep {
  width: 4px;
  height: 4px;
  background: var(--color-gold);
  border-radius: 50%;
  opacity: 0.7;
}

.site-footer {
  background: var(--color-black);
  color: var(--color-white);
  position: relative;
  overflow: hidden;
}

.footer-rule {
  height: 4px;
  background: linear-gradient(90deg, transparent 0%, var(--color-gold) 25%, var(--color-gold) 55%, transparent 100%);
  opacity: 0.72;
  position: relative;
}

.footer-rule::after {
  content: "";
  position: absolute;
  top: -2px;
  left: -5%;
  width: 40%;
  height: 8px;
  background: linear-gradient(110deg, transparent, rgba(212, 175, 55, 0.38), transparent);
  transform: rotate(-8deg);
  pointer-events: none;
}

.footer-main {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 3.5rem var(--gutter) 2.5rem;
  display: grid;
  grid-template-columns: 2fr 1fr 1.2fr;
  gap: 3rem;
  position: relative;
}

.footer-main::before {
  content: "";
  position: absolute;
  right: -6rem;
  top: -2rem;
  width: 13rem;
  height: 13rem;
  border: 2px solid rgba(212, 175, 55, 0.12);
  border-radius: 50%;
  pointer-events: none;
}

.footer-logo {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--color-gold);
  margin-bottom: 0.8rem;
  text-transform: uppercase;
}

.footer-slogan {
  font-family: var(--font-heading);
  font-size: 1rem;
  letter-spacing: 0.1em;
  color: var(--color-white);
  margin-bottom: 1rem;
}

.footer-desc {
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--color-muted);
  max-width: 34rem;
}

.footer-index-title {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  color: var(--color-gold);
  text-transform: uppercase;
  margin-bottom: 1.2rem;
  border-bottom: 1px solid rgba(212, 175, 55, 0.2);
  padding-bottom: 0.5rem;
}

.footer-index-title--spaced {
  margin-top: 2rem;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.footer-links a {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  color: var(--color-muted);
  padding: 0.2rem 0;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.25s ease, padding-left 0.25s var(--ease);
}

.footer-links a:hover {
  color: var(--color-gold);
  border-bottom-color: rgba(212, 175, 55, 0.4);
  padding-left: 0.4rem;
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--color-muted);
}

.footer-contact a {
  color: var(--color-muted);
  transition: color 0.2s ease;
}

.footer-contact a:hover {
  color: var(--color-gold);
}

.footer-meta {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(0, 0, 0, 0.35);
}

.footer-meta-inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 1rem var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  font-family: var(--font-heading);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.46);
  text-transform: uppercase;
}

.footer-meta-note {
  color: rgba(255, 255, 255, 0.34);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.8rem 1.8rem;
  border: 1px solid var(--color-gold);
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--color-gold);
  transition: background 0.3s var(--ease), color 0.3s var(--ease), box-shadow 0.3s var(--ease), transform 0.3s var(--ease);
}

.btn:hover {
  background: var(--color-gold);
  color: var(--color-primary);
  box-shadow: 0 10px 24px rgba(212, 175, 55, 0.25);
  transform: translateY(-2px);
}

.btn--solid {
  background: var(--color-gold);
  color: var(--color-primary);
}

.btn--solid:hover {
  background: var(--color-gold-deep);
  border-color: var(--color-gold-deep);
  color: var(--color-white);
}

.btn--light {
  border-color: rgba(255, 255, 255, 0.4);
  color: var(--color-white);
}

.btn--light:hover {
  background: var(--color-white);
  border-color: var(--color-white);
  color: var(--color-primary);
}

.section-head {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 1.8rem;
  border-bottom: 1px solid rgba(212, 175, 55, 0.18);
  padding-bottom: 1rem;
}

.section-index {
  font-family: var(--font-heading);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--color-gold);
  text-transform: uppercase;
  flex: 0 0 auto;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 4vw, 3rem);
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--color-white);
  text-transform: uppercase;
}

.section-title--light {
  color: var(--color-primary);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.8rem;
}

.card {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  padding: 2rem;
  position: relative;
  overflow: hidden;
  transition: background 0.35s ease, border-color 0.35s ease, transform 0.35s var(--ease), box-shadow 0.35s ease;
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 2rem;
  width: 3px;
  height: 0;
  background: var(--color-gold);
  border-radius: 0 0 4px 4px;
  transition: height 0.4s var(--ease);
}

.card:hover {
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(212, 175, 55, 0.4);
  transform: translateY(-6px);
  box-shadow: var(--shadow-card);
}

.card:hover::before {
  height: 48%;
}

.card--dark {
  background: rgba(17, 17, 17, 0.35);
}

.card--gold {
  background: linear-gradient(135deg, rgba(212, 175, 55, 0.14), rgba(212, 175, 55, 0.04));
  border-color: rgba(212, 175, 55, 0.3);
}

.card-title {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  line-height: 1.25;
  margin-bottom: 0.8rem;
  letter-spacing: 0.02em;
}

.card-text {
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--color-muted);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-heading);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-pill);
  background: rgba(212, 175, 55, 0.14);
  color: var(--color-gold);
  border: 1px solid rgba(212, 175, 55, 0.3);
}

.tag--alert {
  background: rgba(208, 52, 44, 0.14);
  color: #ff8a7a;
  border-color: rgba(208, 52, 44, 0.4);
}

.tag--plain {
  background: rgba(255, 255, 255, 0.08);
  color: var(--color-muted);
  border-color: rgba(255, 255, 255, 0.16);
}

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.6rem;
  font-family: var(--font-heading);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: 2.2rem;
}

.breadcrumb a {
  color: var(--color-gold);
  transition: color 0.2s ease;
}

.breadcrumb a:hover {
  color: var(--color-white);
}

.breadcrumb-sep {
  color: rgba(255, 255, 255, 0.3);
}

.article-body {
  max-width: 46rem;
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.88);
}

.article-body p {
  margin-bottom: 1.4rem;
}

.article-body h2,
.article-body h3 {
  font-family: var(--font-heading);
  color: var(--color-white);
  letter-spacing: 0.02em;
  margin-top: 2.4rem;
  margin-bottom: 1rem;
  line-height: 1.2;
}

.article-body h2 {
  font-size: 1.8rem;
}

.article-body h3 {
  font-size: 1.3rem;
}

.article-body ul,
.article-body ol {
  margin-bottom: 1.4rem;
  padding-left: 1.4rem;
}

.article-body ul li {
  list-style: disc;
  margin-bottom: 0.4rem;
}

.article-body ol li {
  list-style: decimal;
  margin-bottom: 0.4rem;
}

.article-body blockquote {
  border-left: 3px solid var(--color-gold);
  background: rgba(212, 175, 55, 0.06);
  padding: 1rem 1.5rem;
  margin: 1.6rem 0;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-style: italic;
  color: rgba(255, 255, 255, 0.78);
}

.article-body a {
  color: var(--color-gold);
  border-bottom: 1px solid rgba(212, 175, 55, 0.35);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.article-body a:hover {
  color: var(--color-white);
  border-bottom-color: var(--color-gold);
}

.side-note {
  background: rgba(212, 175, 55, 0.07);
  border: 1px solid rgba(212, 175, 55, 0.22);
  border-radius: var(--radius-md);
  padding: 1.6rem;
  font-size: 0.92rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.78);
}

.side-note-title {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  letter-spacing: 0.1em;
  color: var(--color-gold);
  text-transform: uppercase;
  margin-bottom: 0.6rem;
}

.side-note a {
  color: var(--color-gold);
  border-bottom: 1px solid rgba(212, 175, 55, 0.3);
}

.side-note a:hover {
  color: var(--color-white);
}

.progress-track {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  z-index: 200;
  background: transparent;
  pointer-events: none;
}

.progress-track-bar {
  display: block;
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--color-gold-deep), var(--color-gold));
  border-radius: 0 4px 4px 0;
  transition: width 0.1s linear;
}

[data-progress-section] {
  position: relative;
}

[data-progress-section][data-active]::after {
  content: "";
  position: absolute;
  left: -18px;
  top: 0.6em;
  width: 6px;
  height: 6px;
  background: var(--color-gold);
  border-radius: 50%;
  box-shadow: 0 0 12px rgba(212, 175, 55, 0.8);
}

@media (max-width: 1024px) {
  .footer-main {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .header-top-line {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: linear-gradient(180deg, #0E4834 0%, #0B3D2E 100%);
    border-bottom: 1px solid rgba(212, 175, 55, 0.3);
    padding: 0 var(--gutter);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: max-height 0.4s var(--ease), opacity 0.3s ease, transform 0.3s var(--ease), visibility 0.3s;
  }

  .site-nav[data-open] {
    max-height: 480px;
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    overflow-y: auto;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0.2rem;
    padding: 1rem 0 1.4rem;
  }

  .nav-link {
    display: block;
    padding: 0.9rem 1rem;
    font-size: 1.05rem;
    border-radius: var(--radius-md);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }

  .nav-link:hover {
    background: rgba(212, 175, 55, 0.1);
  }

  .header-bottom {
    gap: 0.6rem;
  }

  .header-bottom-sep {
    display: none;
  }

  .footer-main {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding-top: 2.5rem;
  }

  .footer-meta-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.4rem;
  }
}

@media (max-width: 480px) {
  .header-main {
    padding-top: 1rem;
    padding-bottom: 1rem;
  }

  .logo-cn {
    font-size: 1.5rem;
  }

  .logo-en {
    font-size: 0.55rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .card:hover {
    transform: none;
  }

  .btn:hover {
    transform: none;
  }
}