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

:root {
  --color-bg: #0A0A0A;
  --color-gold-deep: #C9A063;
  --color-gold-light: #F0D77B;
  --color-gold-dark: #8C6C1E;
  --color-red: #C41E3A;
  --color-green: #007A5E;
  --color-silver: #A0A0A0;
  --color-ivory: #F5F5F0;
  --font-heading: "Noto Serif SC", "Songti SC", "SimSun", serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
  --font-mono: "Roboto Mono", "Menlo", "Consolas", monospace;
  --header-h: 76px;
  --content-w: 1200px;
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 32px;
  --space-lg: 64px;
  --space-xl: 120px;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --gold-line: 1px solid rgba(201, 160, 99, 0.28);
  --shadow-gold: 0 8px 32px rgba(0, 0, 0, 0.5);
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

body {
  background-color: var(--color-bg);
  background-image: repeating-linear-gradient(
    -45deg,
    transparent 0px,
    transparent 14px,
    rgba(201, 160, 99, 0.014) 14px,
    rgba(201, 160, 99, 0.014) 15px
  );
  color: var(--color-ivory);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

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

ul, ol { list-style: none; }

a { color: var(--color-gold-light); text-decoration: none; transition: color 0.2s ease; }

a:hover { color: var(--color-ivory); }

button { font-family: var(--font-body); cursor: pointer; }

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

::selection {
  background: rgba(201, 160, 99, 0.3);
  color: var(--color-ivory);
}

.container {
  max-width: var(--content-w);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

.visually-hidden {
  position: fixed;
  overflow: hidden;
  width: 1px;
  height: 1px;
  clip-path: inset(50%);
  white-space: nowrap;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 2100;
  display: block;
  padding: 10px 20px;
  background: var(--color-gold-deep);
  color: var(--color-bg);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  border-radius: 4px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
  transform: translateY(-160%);
  transition: transform 0.25s var(--ease-out);
}

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

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-gold-dark), var(--color-gold-light));
  z-index: 2200;
  border-radius: 0 2px 2px 0;
  transition: width 0.08s linear;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10, 10, 10, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: var(--gold-line);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  height: var(--header-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.brand-mark {
  width: 36px;
  height: 36px;
  filter: drop-shadow(0 0 8px rgba(201, 160, 99, 0.25));
}

.brand-text {
  font-family: var(--font-heading);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--color-ivory);
  line-height: 1.2;
}

.brand-accent {
  color: var(--color-gold-light);
  font-weight: 900;
}

.site-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-item { position: relative; }

.nav-link {
  display: block;
  padding: 10px 16px;
  color: var(--color-silver);
  font-size: 15px;
  font-weight: 400;
  letter-spacing: 0.06em;
  border-radius: 2px;
  position: relative;
  transition: color 0.25s ease;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 4px;
  height: 1px;
  background: linear-gradient(90deg, var(--color-gold-deep), var(--color-gold-light));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease-out);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--color-gold-light);
}

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

.nav-link[aria-current="page"] {
  color: var(--color-gold-light);
  font-weight: 500;
}

.header-status {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 5px 14px;
  border: 1px solid rgba(0, 122, 94, 0.45);
  border-radius: 999px;
  font-size: 12px;
  color: var(--color-silver);
  letter-spacing: 0.1em;
  white-space: nowrap;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-green);
  box-shadow: 0 0 8px rgba(0, 122, 94, 0.7);
  animation: status-pulse 2.4s ease-in-out infinite;
}

@keyframes status-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.55; transform: scale(0.88); }
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid rgba(201, 160, 99, 0.35);
  border-radius: 4px;
  padding: 10px;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.nav-toggle:hover {
  border-color: var(--color-gold-deep);
}

.nav-toggle .toggle-bar {
  width: 22px;
  height: 2px;
  background: var(--color-gold-light);
  border-radius: 1px;
  transition: transform 0.3s var(--ease-out), opacity 0.3s ease;
}

.nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-footer {
  margin-top: var(--space-xl);
  background: linear-gradient(180deg, rgba(201, 160, 99, 0.035) 0%, transparent 40%);
  border-top: var(--gold-line);
  position: relative;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, var(--color-gold-dark), var(--color-gold-light), transparent);
}

.footer-top {
  padding: var(--space-lg) 0 var(--space-md);
}

.footer-grid {
  display: grid;
  gap: var(--space-md);
}

@media (min-width: 601px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1.2fr 1fr 1fr 1.2fr;
    gap: var(--space-lg) 48px;
  }
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.footer-logo-mark {
  width: 30px;
  height: 30px;
  filter: drop-shadow(0 0 6px rgba(201, 160, 99, 0.2));
}

.footer-brand-text {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 700;
  color: var(--color-ivory);
  letter-spacing: 0.04em;
}

.footer-trust {
  color: var(--color-silver);
  font-size: 14px;
  line-height: 1.8;
  max-width: 300px;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-heading {
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 600;
  color: var(--color-gold-light);
  letter-spacing: 0.08em;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(201, 160, 99, 0.2);
  position: relative;
}

.footer-heading::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 48px;
  height: 1px;
  background: var(--color-gold-deep);
}

.footer-nav-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-nav-list a {
  color: var(--color-silver);
  font-size: 14px;
  letter-spacing: 0.03em;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.footer-nav-list a:hover {
  color: var(--color-gold-light);
  padding-left: 6px;
}

.contact-line {
  font-size: 14px;
  color: var(--color-silver);
  line-height: 1.9;
  margin-bottom: 4px;
}

.footer-icp {
  color: var(--color-gold-dark);
  font-size: 13px;
  letter-spacing: 0.06em;
}

.footer-bottom {
  border-top: 1px solid rgba(201, 160, 99, 0.14);
  padding: 20px 0;
}

.footer-bottom-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-copyright {
  color: var(--color-silver);
  font-size: 13px;
  letter-spacing: 0.04em;
}

.footer-motto {
  color: var(--color-gold-dark);
  font-size: 13px;
  letter-spacing: 0.18em;
  font-family: var(--font-heading);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 28px;
  border: 1px solid var(--color-gold-deep);
  background: transparent;
  color: var(--color-gold-light);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.08em;
  border-radius: 3px;
  position: relative;
  overflow: hidden;
  transition: color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.btn::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(240, 215, 123, 0.14), transparent);
  transform: translateX(-100%);
  transition: transform 0.5s ease;
}

.btn:hover,
.btn:focus-visible {
  color: var(--color-ivory);
  border-color: var(--color-gold-light);
  box-shadow: 0 0 28px rgba(201, 160, 99, 0.15);
}

.btn:hover::before {
  transform: translateX(100%);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-gold-deep), var(--color-gold-light));
  color: var(--color-bg);
  border-color: transparent;
  font-weight: 700;
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--color-gold-light), var(--color-gold-deep));
  color: var(--color-bg);
  box-shadow: 0 4px 28px rgba(201, 160, 99, 0.3);
}

.btn-ghost {
  border-color: rgba(201, 160, 99, 0.45);
  color: var(--color-silver);
}

.btn-ghost:hover {
  border-color: var(--color-gold-deep);
  color: var(--color-gold-light);
  box-shadow: none;
}

.breadcrumb {
  padding: 20px 0 8px;
  font-size: 14px;
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  color: var(--color-silver);
}

.breadcrumb-item {
  display: inline-flex;
  align-items: center;
}

.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  color: var(--color-gold-dark);
  margin-right: 6px;
}

.breadcrumb-link {
  color: var(--color-gold-deep);
}

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

.breadcrumb-current {
  color: var(--color-silver);
}

.page-container {
  max-width: 960px;
  margin: 0 auto;
  padding: var(--space-lg) 24px;
}

.cut-panel {
  position: relative;
  padding: var(--space-md) var(--space-md) var(--space-lg);
  background: linear-gradient(135deg, rgba(201, 160, 99, 0.055) 0%, rgba(201, 160, 99, 0.02) 100%);
  border: 1px solid rgba(201, 160, 99, 0.25);
}

.cut-panel::before {
  content: "";
  position: absolute;
  top: -1px;
  right: -1px;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 26px 26px 0;
  border-color: transparent var(--color-gold-deep) transparent transparent;
}

.cut-panel::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: -1px;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 26px 0 0 26px;
  border-color: transparent transparent transparent rgba(201, 160, 99, 0.45);
}

.section-label {
  display: inline-block;
  margin-bottom: 12px;
  padding: 4px 14px;
  border-left: 3px solid var(--color-gold-deep);
  background: rgba(201, 160, 99, 0.07);
  color: var(--color-gold-light);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.diagonal-line {
  height: 1px;
  margin: var(--space-md) 0;
  background: linear-gradient(90deg, transparent, var(--color-gold-deep) 30%, var(--color-gold-light) 50%, var(--color-gold-dark) 70%, transparent);
  transform: rotate(-1.5deg);
  opacity: 0.55;
}

.speed-stripe {
  height: 6px;
  background: repeating-linear-gradient(
    -55deg,
    rgba(201, 160, 99, 0.85) 0px,
    rgba(201, 160, 99, 0.85) 4px,
    transparent 4px,
    transparent 9px
  );
  border-left: 3px solid var(--color-gold-light);
  border-right: 3px solid var(--color-gold-dark);
  opacity: 0.6;
}

.grid {
  display: grid;
  gap: var(--space-md);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

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

.grid item-style {
  background: rgba(201, 160, 99, 0.04);
  border: 1px solid rgba(201, 160, 99, 0.16);
  border-radius: 4px;
  padding: var(--space-md);
}

.img-container {
  position: relative;
  overflow: hidden;
  background: rgba(201, 160, 99, 0.05);
  border: 1px solid rgba(201, 160, 99, 0.18);
  border-radius: 3px;
}

.img-container img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.5s var(--ease-out);
}

.img-container:hover img {
  transform: scale(1.02);
}

.img-ratio-wide { aspect-ratio: 16 / 9; }
.img-ratio-portrait { aspect-ratio: 3 / 4; }
.img-ratio-square { aspect-ratio: 1 / 1; }

.figure-caption {
  margin-top: 8px;
  color: var(--color-silver);
  font-size: 13px;
  line-height: 1.5;
  letter-spacing: 0.03em;
}

.stat-number {
  font-family: var(--font-mono);
  font-size: 36px;
  font-weight: 700;
  color: var(--color-gold-light);
  line-height: 1.1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

.stat-label {
  margin-top: 6px;
  color: var(--color-silver);
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.trust-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border: 1px solid rgba(0, 122, 94, 0.45);
  border-radius: 3px;
  color: var(--color-green);
  font-size: 13px;
  letter-spacing: 0.06em;
  background: rgba(0, 122, 94, 0.06);
}

.alert-tag {
  display: inline-block;
  padding: 4px 12px;
  border: 1px solid rgba(196, 30, 58, 0.5);
  border-radius: 2px;
  color: var(--color-red);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  background: rgba(196, 30, 58, 0.06);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag-item {
  display: inline-block;
  padding: 8px 16px;
  border: 1px solid rgba(201, 160, 99, 0.35);
  border-radius: 2px;
  color: var(--color-gold-deep);
  font-size: 14px;
  letter-spacing: 0.04em;
  background: rgba(201, 160, 99, 0.04);
  transition: all 0.25s ease;
}

.tag-item:hover {
  border-color: var(--color-gold-light);
  color: var(--color-gold-light);
  background: rgba(201, 160, 99, 0.1);
}

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

.tab-list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  border-bottom: 1px solid rgba(201, 160, 99, 0.2);
  padding-bottom: 0;
}

.tab-trigger {
  display: inline-block;
  padding: 10px 18px;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--color-silver);
  font-size: 14px;
  letter-spacing: 0.05em;
  transition: color 0.25s ease, border-color 0.25s ease;
}

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

.tab-trigger[aria-selected="true"] {
  color: var(--color-gold-light);
  border-bottom-color: var(--color-gold-deep);
  font-weight: 600;
}

.tab-panel {
  background: rgba(201, 160, 99, 0.02);
  border: 1px solid rgba(201, 160, 99, 0.14);
  border-radius: 0 0 4px 4px;
  padding: var(--space-md);
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-gold-light);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.04em;
  transition: gap 0.2s ease;
}

.link-arrow::after {
  content: "→";
  font-family: var(--font-mono);
  transition: transform 0.2s ease;
}

.link-arrow:hover {
  gap: 10px;
}

.link-arrow:hover::after {
  transform: translateX(2px);
}

@media (max-width: 900px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background: rgba(10, 10, 10, 0.97);
    border-bottom: 1px solid var(--color-gold-dark);
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.6);
    padding: 16px 24px 28px;
    display: none;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
  }

  .site-nav[data-open] {
    display: flex;
    animation: nav-in 0.25s var(--ease-out);
  }

  @keyframes nav-in {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    width: 100%;
  }

  .nav-item {
    width: 100%;
  }

  .nav-link {
    padding: 14px 12px;
    font-size: 16px;
    border-bottom: 1px solid rgba(201, 160, 99, 0.1);
    width: 100%;
  }

  .nav-link::after {
    display: none;
  }

  .nav-item:last-child .nav-link {
    border-bottom: none;
  }

  .header-status {
    display: none;
  }

  .container {
    padding-left: 20px;
    padding-right: 20px;
  }

  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 901px) and (max-width: 1100px) {
  .nav-link {
    padding: 10px 12px;
    font-size: 14px;
  }

  .brand-text {
    font-size: 17px;
  }
}

@media (min-width: 1024px) {
  .header-status {
    display: inline-flex;
  }
}

@media (max-width: 600px) {
  :root {
    --header-h: 64px;
  }

  .brand-mark {
    width: 30px;
    height: 30px;
  }

  .brand-text {
    font-size: 17px;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .page-container {
    padding: var(--space-md) 20px;
  }

  .cut-panel {
    padding: 20px 16px 28px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

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

  .footer-motto {
    font-size: 12px;
  }

  .stat-number {
    font-size: 30px;
  }
}

@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;
  }

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

  .status-dot {
    animation: none;
  }
}