:root {
  --color-bg: #0A1128;
  --color-bg-deep: #0D1530;
  --color-panel: #1B2440;
  --color-gold: #D4AF37;
  --color-light-gold: #F5D461;
  --color-crimson: #8B0000;
  --color-neon: #39FF14;
  --color-text: #FFFFFF;
  --color-muted: #A0AEC0;
  --color-grid: #2C3E70;
  --color-error: #FF6B6B;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Source Han Serif CN", "Songti SC", SimSun, serif;
  --font-sans: "Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei", "PingFang SC", sans-serif;
  --font-mono: "Roboto Mono", "SFMono-Regular", Menlo, Consolas, monospace;
  --header-h: 64px;
  --sidebar-w: 240px;
  --transition: 0.25s ease;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  line-height: 1.15;
}

body {
  margin: 0;
  padding: var(--header-h) 0 0;
  background:
    radial-gradient(ellipse at top, rgba(212, 175, 55, 0.04), transparent 70%),
    var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
}

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

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 800;
  line-height: 1.2;
  color: var(--color-text);
  margin: 0 0 1rem;
}

p {
  margin: 0 0 1rem;
}

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

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
}

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

#main-content {
  scroll-margin-top: 88px;
}

.site-main {
  padding: 2rem 0 4rem;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--color-gold);
  color: var(--color-bg);
  padding: 0.75rem 1.25rem;
  font-weight: 700;
  z-index: 1000;
}

.skip-link:focus {
  left: 0;
  top: 0;
  color: var(--color-bg);
  outline: 2px solid var(--color-neon);
}

.site-header {
  position: relative;
  z-index: 100;
}

.header-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0 1.5rem;
  background: rgba(10, 17, 40, 0.92);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(212, 175, 55, 0.3);
  z-index: 200;
}

.brand {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 900;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--color-gold);
  display: inline-flex;
  align-items: baseline;
  white-space: nowrap;
}

.brand-cn {
  color: var(--color-text);
  font-weight: 700;
}

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

.header-meta {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-left: auto;
}

.header-search {
  position: relative;
}

.header-search::before {
  content: "";
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  width: 12px;
  height: 12px;
  border: 2px solid var(--color-muted);
  border-radius: 50%;
  pointer-events: none;
}

.header-search::after {
  content: "";
  position: absolute;
  left: 1.45rem;
  top: calc(50% + 0.4rem);
  width: 7px;
  height: 2px;
  background: var(--color-muted);
  transform: rotate(45deg);
  pointer-events: none;
}

.search-input {
  width: 220px;
  padding: 0.55rem 1rem 0.55rem 2.3rem;
  background: var(--color-panel);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  border-radius: 0;
  transition: border-color 0.2s ease;
}

.search-input::placeholder {
  color: var(--color-muted);
}

.search-input:focus {
  outline: none;
  border-color: var(--color-gold);
}

.sync-status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--color-muted);
  font-family: var(--font-mono);
  white-space: nowrap;
}

.sync-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-neon);
  box-shadow: 0 0 8px var(--color-neon);
  animation: sync-pulse 2.4s ease-in-out infinite;
}

.sync-text {
  font-family: var(--font-mono);
}

@keyframes sync-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: none;
  border: 1px solid rgba(212, 175, 55, 0.4);
  color: var(--color-gold);
  padding: 0.45rem 0.9rem;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  transition: background 0.2s ease;
}

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

.nav-toggle-text {
  margin-right: 0.25rem;
}

.nav-toggle-icon {
  position: relative;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: background 0.2s ease;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: transform 0.2s ease, top 0.2s ease;
}

.nav-toggle-icon::before {
  top: -6px;
}

.nav-toggle-icon::after {
  top: 6px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after {
  top: 0;
  transform: rotate(-45deg);
}

.site-nav {
  position: fixed;
  top: var(--header-h);
  left: 0;
  bottom: 0;
  width: var(--sidebar-w);
  background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-deep) 100%);
  border-right: 1px solid rgba(212, 175, 55, 0.25);
  padding: 2rem 0;
  overflow-y: auto;
  z-index: 150;
  transition: transform var(--transition);
  transform: translateX(-100%);
}

.site-nav[data-open] {
  transform: translateX(0);
  box-shadow: 4px 0 24px rgba(0, 0, 0, 0.4);
}

.nav-list {
  padding: 0 1.25rem;
}

.nav-item {
  margin-bottom: 0.25rem;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.7rem 1rem;
  color: var(--color-muted);
  font-weight: 500;
  border-left: 2px solid transparent;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.nav-link::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.5;
  flex-shrink: 0;
}

.nav-link:hover,
.nav-link[aria-current="page"] {
  color: var(--color-light-gold);
  border-left-color: var(--color-gold);
  background: rgba(212, 175, 55, 0.08);
}

.nav-link[aria-current="page"]::before {
  background: var(--color-gold);
  opacity: 1;
  box-shadow: 0 0 8px var(--color-gold);
}

.nav-note {
  margin: 1.5rem 1.25rem 0;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.7rem;
  color: var(--color-muted);
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
}

.site-footer {
  position: relative;
  background: var(--color-bg-deep);
  border-top: 1px solid rgba(212, 175, 55, 0.25);
  padding: 3rem 1.5rem 1.5rem;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-gold), var(--color-crimson), var(--color-neon));
  opacity: 0.6;
}

.footer-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.8fr;
  gap: 2rem;
}

.footer-brand .brand {
  font-size: 1.8rem;
}

.footer-tagline {
  color: var(--color-muted);
  margin: 0.75rem 0 1rem;
}

.footer-sync {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-neon);
  font-size: 0.8rem;
  font-family: var(--font-mono);
}

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

.footer-links ul {
  display: grid;
  gap: 0.5rem;
}

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

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

.footer-title {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--color-gold);
  margin-bottom: 1rem;
}

.footer-contact-line {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
  color: var(--color-muted);
}

.footer-note {
  color: var(--color-neon);
  font-size: 0.8rem;
}

.footer-bottom {
  max-width: 1200px;
  margin: 2rem auto 0;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--color-muted);
}

.btn {
  display: inline-block;
  padding: 0.65rem 1.4rem;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.9rem;
  line-height: 1;
  border: 1px solid var(--color-gold);
  color: var(--color-gold);
  background: transparent;
  text-align: center;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn:hover {
  background: rgba(212, 175, 55, 0.12);
  color: var(--color-light-gold);
}

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

.btn-primary:hover {
  background: var(--color-light-gold);
  color: var(--color-bg-deep);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--color-muted);
  margin-bottom: 2rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

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

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

.breadcrumb [aria-current="page"] {
  color: var(--color-text);
}

.card {
  background: var(--color-panel);
  border: 1px solid rgba(255, 255, 255, 0.08);
  padding: 1.5rem;
  transition: border-color 0.2s ease;
}

.card:hover {
  border-color: rgba(212, 175, 55, 0.4);
}

.section-title {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--color-gold);
  border-left: 4px solid var(--color-gold);
  padding-left: 1rem;
  margin-bottom: 1.25rem;
}

.grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: 1fr;
}

.image-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 180px;
  background: linear-gradient(135deg, var(--color-panel), var(--color-bg-deep));
  border: 1px solid rgba(212, 175, 55, 0.25);
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  position: relative;
  overflow: hidden;
}

.image-placeholder::before {
  content: attr(data-label);
}

.image-placeholder:not([data-label])::before {
  content: "IMG";
}

.image-placeholder::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 24px 24px;
  pointer-events: none;
}

.filter-btn {
  display: inline-block;
  padding: 0.5rem 1rem;
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: transparent;
  color: var(--color-muted);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.filter-btn:hover {
  color: var(--color-light-gold);
  border-color: rgba(212, 175, 55, 0.5);
}

.filter-btn.is-active {
  color: var(--color-gold);
  border-color: var(--color-gold);
  background: rgba(212, 175, 55, 0.12);
}

.is-hidden {
  display: none !important;
}

.text-danger {
  color: var(--color-error);
}

@media (max-width: 640px) {
  .header-bar {
    padding: 0 0.75rem;
  }

  .brand {
    font-size: 1.15rem;
  }

  .header-meta {
    gap: 0.5rem;
  }

  .header-search {
    display: none;
  }

  .sync-text {
    display: none;
  }

  .nav-toggle-text {
    display: none;
  }

  .nav-toggle {
    padding: 0.45rem 0.6rem;
  }

  .site-nav {
    width: 280px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

@media (min-width: 641px) and (max-width: 991px) {
  .site-nav {
    width: 280px;
  }

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

@media (min-width: 992px) {
  body {
    padding-left: var(--sidebar-w);
  }

  .nav-toggle {
    display: none;
  }

  .site-nav {
    transform: none;
  }

  .site-nav[data-open] {
    box-shadow: none;
  }

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

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