:root {
  --color-deep-space: #0B1B3A;
  --color-aux-space: #0F2A52;
  --color-gold: #D4AF37;
  --color-gold-end: #F1D07A;
  --color-vivid-orange: #FF6B35;
  --color-bg: #F5F7FA;
  --color-muted: #8A94A6;
  --color-light: #E8EDF2;
  --color-dark: #16233A;
  --color-line: #2C3E50;
  --color-line-light: rgba(44, 62, 80, 0.16);
  --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --font-mono: "Roboto Mono", "SF Mono", "Consolas", monospace;
  --header-width: 280px;
  --content-max: 1280px;
  --radius: 6px;
  --shadow-sm: 0 2px 8px rgba(11, 27, 58, 0.06);
  --shadow-lg: 0 16px 40px rgba(11, 27, 58, 0.14);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

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

html {
  margin: 0;
  padding: 0;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  margin-left: var(--header-width);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-dark);
  background: var(--color-bg);
  min-height: 100vh;
  word-break: break-word;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

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

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

h1, h2, h3, h4 {
  line-height: 1.25;
  font-weight: 800;
  color: var(--color-dark);
  text-wrap: balance;
}

h1 {
  font-size: clamp(2.25rem, 5vw, 4rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.6rem, 3vw, 2.25rem);
}

h3 {
  font-size: 1.2rem;
}

p {
  text-wrap: pretty;
}

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

#main-content {
  outline: none;
  min-height: 60vh;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: calc(var(--header-width) + 8px);
  z-index: 3000;
  background: var(--color-gold);
  color: var(--color-dark);
  padding: 8px 16px;
  border-radius: 4px;
  font-weight: 700;
  box-shadow: var(--shadow-lg);
  transform: translateY(-160%);
  transition: transform 0.25s var(--ease);
}

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

.content-shell {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 56px 28px;
}

.section {
  padding: clamp(40px, 7vw, 88px) 0;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--color-muted);
  margin-bottom: 20px;
}

.breadcrumbs a {
  color: var(--color-gold);
}

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

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: 4px;
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  transition: background 0.25s var(--ease), border-color 0.25s var(--ease), box-shadow 0.25s var(--ease), transform 0.25s var(--ease);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-gold) 0%, var(--color-gold-end) 100%);
  color: var(--color-dark);
  box-shadow: 0 2px 8px rgba(212, 175, 55, 0.2);
}

.btn-primary:hover {
  box-shadow: 0 8px 24px rgba(212, 175, 55, 0.35);
  transform: translateY(-1px);
}

.btn-secondary {
  border-color: rgba(212, 175, 55, 0.65);
  color: var(--color-gold);
}

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

.grid {
  display: grid;
  gap: 24px;
}

.grid-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.card {
  background: var(--color-bg);
  border: 1px solid var(--color-line-light);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.3s var(--ease), transform 0.3s var(--ease), border-color 0.3s var(--ease);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
  border-color: rgba(212, 175, 55, 0.35);
}

.card-summary {
  color: var(--color-muted);
  font-size: 0.94rem;
  line-height: 1.75;
  margin-top: 8px;
}

.card-index {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-gold);
  margin-bottom: 10px;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-gold);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.index-list {
  display: grid;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

.index-list dt {
  color: var(--color-gold);
  font-weight: 700;
}

.index-list dd {
  color: var(--color-muted);
  margin-top: 2px;
}

.visual-placeholder {
  position: relative;
  min-height: 280px;
  border: 1px solid rgba(212, 175, 55, 0.18);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-muted);
  background:
    radial-gradient(circle at 18% 28%, rgba(212, 175, 55, 0.22) 0 1px, transparent 2px),
    radial-gradient(circle at 70% 16%, rgba(241, 208, 122, 0.18) 0 2px, transparent 3px),
    radial-gradient(circle at 42% 68%, rgba(255, 107, 53, 0.16) 0 1px, transparent 2px),
    linear-gradient(135deg, var(--color-aux-space) 0%, var(--color-deep-space) 65%);
}

.visual-placeholder::before {
  content: "168";
  font-family: var(--font-mono);
  font-size: clamp(3rem, 8vw, 7rem);
  font-weight: 800;
  letter-spacing: -0.08em;
  color: var(--color-gold);
  opacity: 0.7;
}

.visual-placeholder::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(212, 175, 55, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(212, 175, 55, 0.08) 1px, transparent 1px);
  background-size: 34px 34px;
  mix-blend-mode: overlay;
  pointer-events: none;
}

.image-caption {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-muted);
  margin-top: 8px;
  padding: 0 2px;
}

.site-header {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  width: var(--header-width);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  background: linear-gradient(180deg, rgba(11, 27, 58, 0.82) 0%, rgba(15, 42, 82, 0.88) 100%);
  border-right: 1px solid rgba(212, 175, 55, 0.22);
  backdrop-filter: blur(14px);
  transition: background 0.4s var(--ease), box-shadow 0.4s var(--ease);
}

[data-scrolled] .site-header {
  background: linear-gradient(180deg, var(--color-deep-space) 0%, var(--color-aux-space) 100%);
  box-shadow: 0 1px 0 rgba(212, 175, 55, 0.28);
}

.brand-rail {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 36px 24px 22px;
  overflow-x: hidden;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(212, 175, 55, 0.3) transparent;
}

.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  color: var(--color-light);
}

.brand-lockup:hover .brand-mark {
  border-color: var(--color-gold-end);
  box-shadow: 0 0 0 4px rgba(212, 175, 55, 0.12);
}

.brand-mark {
  position: relative;
  flex: 0 0 auto;
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border: 1px solid var(--color-gold);
  border-radius: 50% 50% 2px 50%;
  background: linear-gradient(135deg, rgba(212, 175, 55, 0.12), rgba(241, 208, 122, 0.28));
  transition: border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.brand-mark::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 24px;
  height: 24px;
  border: 1px solid rgba(255, 107, 53, 0.7);
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

.brand-mark-core {
  width: 10px;
  height: 10px;
  background: var(--color-gold);
  transform: rotate(45deg);
  box-shadow: 0 0 8px rgba(241, 208, 122, 0.8);
}

.brand-text {
  display: grid;
  gap: 2px;
}

.brand-name {
  font-size: 1.28rem;
  font-weight: 900;
  letter-spacing: 0.02em;
  line-height: 1.2;
  color: var(--color-gold);
}

.brand-subtitle {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.site-nav {
  margin-top: 44px;
}

.nav-list {
  display: grid;
  gap: 6px;
}

.nav-item {
  margin: 0;
}

.nav-link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 10px;
  border-radius: 4px;
  border-left: 2px solid transparent;
  color: var(--color-light);
  font-size: 0.94rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  transition: color 0.2s var(--ease), background 0.2s var(--ease), padding-left 0.25s var(--ease), border-color 0.2s var(--ease);
}

.nav-link:hover {
  color: var(--color-gold);
  background: rgba(212, 175, 55, 0.06);
  padding-left: 14px;
}

.nav-link[aria-current="page"] {
  color: var(--color-gold);
  border-left-color: var(--color-gold);
  background: linear-gradient(90deg, rgba(212, 175, 55, 0.1), transparent);
}

.nav-index {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-muted);
  letter-spacing: 0.05em;
  min-width: 23px;
}

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

.nav-text {
  white-space: nowrap;
}

.header-actions {
  margin-top: auto;
  padding-top: 24px;
}

.btn-header-cta {
  width: 100%;
}

.nav-toggle {
  display: none;
}

.nav-toggle-lines {
  display: grid;
  gap: 5px;
  justify-items: center;
}

.nav-toggle-line {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-gold);
  transition: transform 0.25s var(--ease), opacity 0.25s var(--ease);
}

.nav-toggle-label {
  font-size: 0.64rem;
  color: var(--color-muted);
  letter-spacing: 0.06em;
}

.scroll-progress {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--color-gold) 0%, var(--color-vivid-orange) 100%);
  transform: scaleY(0);
  transform-origin: top;
  pointer-events: none;
  z-index: 5;
}

.site-footer {
  background: linear-gradient(180deg, var(--color-deep-space) 0%, var(--color-aux-space) 100%);
  color: var(--color-light);
  border-top: 1px solid rgba(212, 175, 55, 0.2);
  padding: 56px 0 22px;
}

.footer-grid {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 28px;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.6fr;
  gap: 44px;
}

.footer-brand,
.footer-col,
.footer-contact {
  min-width: 0;
}

.brand-lockup--footer .brand-mark {
  width: 38px;
  height: 38px;
}

.footer-slogan {
  color: var(--color-muted);
  margin-top: 18px;
  max-width: 42ch;
  font-size: 0.92rem;
  line-height: 1.8;
}

.trust-line {
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: rgba(212, 175, 55, 0.9);
  letter-spacing: 0.03em;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 12px;
}

.footer-title {
  color: var(--color-gold);
  font-size: 0.84rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 14px;
}

.footer-links {
  display: grid;
  gap: 10px;
}

.footer-link {
  color: var(--color-light);
  opacity: 0.82;
  font-size: 0.92rem;
  transition: color 0.2s var(--ease), opacity 0.2s var(--ease), padding-left 0.25s var(--ease);
}

.footer-link:hover {
  color: var(--color-gold);
  opacity: 1;
  padding-left: 4px;
}

.contact-list {
  display: grid;
  gap: 10px;
  font-size: 0.9rem;
}

.contact-item {
  display: grid;
  gap: 2px;
  color: var(--color-light);
  opacity: 0.85;
}

.contact-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--color-gold);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.footer-bottom {
  max-width: var(--content-max);
  margin: 42px auto 0;
  padding: 22px 28px 0;
  border-top: 1px solid rgba(212, 175, 55, 0.16);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  flex-wrap: wrap;
  color: var(--color-muted);
  font-size: 0.8rem;
}

.footer-copy {
  font-family: var(--font-mono);
}

.footer-icp {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

@media (max-width: 1100px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 899px) {
  body {
    margin-left: 0;
  }

  .skip-link {
    left: 8px;
  }

  .site-header {
    top: 0;
    right: 0;
    bottom: auto;
    left: 0;
    width: auto;
    height: 64px;
    display: flex;
    flex-direction: row;
    align-items: center;
    padding: 0 14px;
    background: linear-gradient(180deg, rgba(11, 27, 58, 0.94), rgba(15, 42, 82, 0.96));
    border-right: 0;
    border-bottom: 1px solid rgba(212, 175, 55, 0.2);
  }

  [data-scrolled] .site-header {
    background: linear-gradient(180deg, var(--color-deep-space) 0%, var(--color-aux-space) 100%);
  }

  .scroll-progress {
    display: none;
  }

  .brand-rail {
    flex-direction: row;
    align-items: center;
    width: 100%;
    height: 64px;
    padding: 0;
    gap: 12px;
    overflow: visible;
  }

  .brand-lockup {
    margin-right: auto;
  }

  .brand-mark {
    width: 36px;
    height: 36px;
  }

  .brand-subtitle {
    display: none;
  }

  .header-actions {
    display: none;
  }

  .site-nav {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    display: none;
    margin: 0;
    padding: 14px;
    background: linear-gradient(180deg, var(--color-deep-space) 0%, var(--color-aux-space) 100%);
    border-bottom: 1px solid rgba(212, 175, 55, 0.24);
    box-shadow: 0 16px 32px rgba(11, 27, 58, 0.25);
    opacity: 0;
    transform: translateY(-6px);
    transition: opacity 0.25s var(--ease), transform 0.25s var(--ease);
  }

  .site-nav[data-open] {
    display: block;
    opacity: 1;
    transform: none;
  }

  .nav-list {
    gap: 4px;
  }

  .nav-link {
    padding: 12px 10px;
    border-left-width: 2px;
  }

  .nav-toggle {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 6px 4px;
    margin-left: 4px;
    border-radius: 4px;
  }

  .nav-toggle-lines {
    gap: 5px;
  }

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

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

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

  .content-shell {
    padding: 36px 20px;
  }

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 0 20px;
  }

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

@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;
  }
}