:root {
  --font-mono: "Noto Sans Mono CJK SC", "SF Mono", "Cascadia Mono", "Roboto Mono", Consolas, "Liberation Mono", monospace;
  --font-sans: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --color-ink: #0D2B4E;
  --color-blue: #1E5AA8;
  --color-red: #C3272B;
  --color-gold: #D4AF37;
  --color-text: #4A4A4A;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F5F7FA;
  --color-white: #FFFFFF;
  --color-white-soft: rgba(255, 255, 255, 0.72);
  --color-white-border: rgba(255, 255, 255, 0.6);
  --color-deep-text: rgba(255, 255, 255, 0.82);
  --color-muted-deep: rgba(255, 255, 255, 0.78);
  --color-border-deep: rgba(13, 43, 78, 0.12);
  --color-border-soft: rgba(13, 43, 78, 0.08);
  --color-blue-border: rgba(30, 90, 168, 0.15);
  --color-blue-bg: rgba(30, 90, 168, 0.08);
  --radius: 4px;
  --radius-sm: 2px;
  --shadow-card: 0 8px 30px rgba(13, 43, 78, 0.12);
  --shadow-nav: 0 24px 60px rgba(13, 43, 78, 0.18);
  --transition-fast: 0.2s ease;
  --transition-base: 0.25s ease;
}

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

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

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 1rem;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-sans);
  font-weight: 900;
  color: var(--color-ink);
  line-height: 1.2;
}

h1 {
  font-size: clamp(2.5rem, 6vw, 3.5rem);
  margin: 0 0 1.5rem;
}

h2 {
  font-size: clamp(1.9rem, 4vw, 2.5rem);
  margin: 0 0 1.25rem;
}

h3 {
  font-size: clamp(1.35rem, 3vw, 1.75rem);
  margin: 0 0 1rem;
}

h4 {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  margin: 0 0 0.75rem;
}

p {
  margin: 0 0 1rem;
}

ul, ol {
  margin: 0 0 1.5rem;
  padding-left: 1.5rem;
}

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

strong {
  font-weight: 700;
}

a {
  color: var(--color-blue);
  transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}

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

button {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  border: none;
  background: none;
  padding: 0;
  cursor: pointer;
}

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

.container {
  width: min(calc(100% - 2rem), 1440px);
  margin-inline: auto;
}

.container--narrow {
  width: min(calc(100% - 2rem), 640px);
  margin-inline: auto;
}

.container--wide {
  width: min(calc(100% - 2rem), 840px);
  margin-inline: auto;
}

.section {
  padding-block: clamp(3rem, 8vw, 6rem);
}

.section--condensed {
  padding-block: clamp(2rem, 5vw, 4rem);
}

.section--tight {
  padding-block: 1.5rem;
}

.section--alt {
  background: var(--color-bg-alt);
}

.section--deep {
  background: var(--color-ink);
  color: var(--color-deep-text);
}

.section--deep h1,
.section--deep h2,
.section--deep h3,
.section--deep h4 {
  color: var(--color-white);
}

.split-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.6fr);
  gap: clamp(2rem, 5vw, 4rem);
}

.split-aside {
  position: sticky;
  top: 2rem;
  align-self: start;
}

.split-content {
  min-width: 0;
}

@media (max-width: 1023px) {
  .split-layout {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .split-aside {
    position: static;
  }
}

.glass {
  background: var(--color-white-soft);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border: 1px solid var(--color-white-border);
  box-shadow: var(--shadow-card);
  border-radius: var(--radius);
}

.glass--dark {
  background: rgba(13, 43, 78, 0.72);
  border-color: rgba(13, 43, 78, 0.2);
  color: var(--color-white);
}

.figure {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--color-bg-alt);
}

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

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

.figure--glass {
  border: 1px solid rgba(255, 255, 255, 0.4);
  box-shadow: var(--shadow-card);
}

.figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.figure-caption {
  padding: 0.75rem 0.25rem 0;
  font-size: 0.8125rem;
  color: var(--color-text);
}

.collage-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  grid-auto-rows: 110px;
  gap: 1rem;
}

.collage-item--large {
  grid-column: span 7;
  grid-row: span 3;
}

.collage-item--medium {
  grid-column: span 5;
  grid-row: span 2;
}

.collage-item--small {
  grid-column: span 4;
  grid-row: span 2;
}

@media (max-width: 767px) {
  .collage-grid {
    grid-template-columns: 1fr;
    grid-auto-rows: auto;
  }

  .collage-item--large,
  .collage-item--medium,
  .collage-item--small {
    grid-column: span 1;
    grid-row: span 1;
  }
}

.data-hero {
  font-family: var(--font-mono);
  font-size: clamp(3.5rem, 10vw, 7rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--color-blue);
  font-variant-numeric: tabular-nums;
}

.data-hero[data-accent="gold"] {
  color: var(--color-gold);
}

.data-hero[data-accent="red"] {
  color: var(--color-red);
}

.table-overlay {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--color-blue-border);
  background: linear-gradient(135deg, var(--color-blue-bg), rgba(255, 255, 255, 0.9));
  padding: 1.5rem;
}

.mono-index {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.03em;
  color: var(--color-text);
}

.hover-lift {
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.hover-lift:hover {
  box-shadow: var(--shadow-card);
  transform: translateY(-4px);
}

.diamond {
  display: inline-block;
  width: 0.75rem;
  height: 0.75rem;
  background: var(--color-blue);
  transform: rotate(45deg);
  flex: none;
}

.ridge {
  display: block;
  width: 100%;
  height: 6px;
  background: linear-gradient(90deg, var(--color-blue) 0 42%, var(--color-bg) 42% 58%, var(--color-gold) 58% 100%);
  border: none;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.4rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.2;
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  background: transparent;
  color: var(--color-blue);
  transition: background var(--transition-base), color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

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

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

.btn-ghost {
  border-color: var(--color-blue);
  color: var(--color-blue);
}

.btn-ghost:hover {
  background: var(--color-blue);
  border-color: var(--color-blue);
  color: var(--color-white);
}

.btn-on-dark {
  border-color: rgba(255, 255, 255, 0.7);
  color: var(--color-white);
}

.btn-on-dark:hover {
  background: var(--color-white);
  border-color: var(--color-white);
  color: var(--color-ink);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  padding-block: 1rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-text);
}

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

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

.breadcrumb [aria-current="page"] {
  color: var(--color-ink);
  font-weight: 700;
}

.note {
  padding: 1rem 1.25rem;
  border-left: 4px solid var(--color-blue);
  background: var(--color-bg-alt);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 0.9375rem;
  margin-block: 1.5rem;
}

.note-warning {
  border-left-color: var(--color-red);
  background: rgba(195, 39, 43, 0.06);
}

.site-header {
  position: relative;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border-deep);
}

.skip-link {
  position: absolute;
  top: 0.5rem;
  left: 0.75rem;
  z-index: 200;
  padding: 0.6rem 1rem;
  background: var(--color-ink);
  color: var(--color-white);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  border-radius: var(--radius);
  transform: translateY(-300%);
  transition: transform var(--transition-fast);
}

.skip-link:focus {
  transform: translateY(0);
  color: var(--color-white);
}

.header-topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 0.45rem 1.5rem;
  background: var(--color-ink);
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.75rem;
  letter-spacing: 0.02em;
}

.topbar-tagline {
  margin: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topbar-contact {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  white-space: nowrap;
}

.topbar-contact-sep {
  color: rgba(255, 255, 255, 0.35);
}

.header-masthead {
  padding: 2.5rem 1.5rem 1.75rem;
  text-align: center;
  border-bottom: 1px solid var(--color-border-soft);
}

.brand {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  color: var(--color-blue);
  text-decoration: none;
}

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

.brand-kicker {
  margin-bottom: 0.25rem;
  font-size: 0.75rem;
  letter-spacing: 0.45em;
  text-transform: uppercase;
  color: var(--color-text);
}

.brand-name {
  font-family: var(--font-sans);
  font-size: clamp(2rem, 6vw, 4.25rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: 0.06em;
  color: var(--color-blue);
  background: linear-gradient(175deg, var(--color-blue) 0%, var(--color-ink) 85%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-tagline {
  margin-top: 0.25rem;
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  color: var(--color-text);
}

.main-nav {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  background: var(--color-bg);
}

.nav-toggle {
  display: none;
}

.nav-list {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.25rem;
}

.nav-link {
  display: block;
  padding: 0.9rem 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-text);
  letter-spacing: 0.03em;
  border-bottom: 3px solid transparent;
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-blue);
  background: var(--color-bg-alt);
  border-bottom-color: var(--color-blue);
}

.nav-link[aria-current="page"] {
  color: var(--color-blue);
  font-weight: 700;
  border-bottom-color: var(--color-red);
}

.site-footer {
  background: var(--color-ink);
  color: var(--color-muted-deep);
  font-size: 0.875rem;
}

.footer-main {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.2fr;
  gap: 2.5rem;
  max-width: calc(1440px + 3rem);
  margin-inline: auto;
  padding: 4rem 1.5rem 3rem;
}

.footer-brand-kicker {
  margin-bottom: 0.25rem;
  font-size: 0.75rem;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.45);
}

.footer-brand-name {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 1.75rem;
  line-height: 1.2;
  color: var(--color-white);
  margin-bottom: 0.5rem;
}

.footer-brand-tagline {
  font-size: 0.8125rem;
  color: #A8D0E6;
  margin-bottom: 1.5rem;
}

.footer-trust {
  color: rgba(255, 255, 255, 0.65);
  line-height: 1.7;
  margin: 0;
}

.footer-heading {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--color-white);
  margin-bottom: 1rem;
}

.footer-nav-list,
.footer-contact-list {
  display: grid;
  gap: 0.4rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-nav-list li,
.footer-contact-item {
  margin: 0;
}

.footer-link {
  color: var(--color-muted-deep);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.footer-support .footer-contact-item {
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.6;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  max-width: calc(1440px + 3rem);
  margin-inline: auto;
  padding: 1.25rem 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.55);
}

.footer-copy {
  margin: 0;
}

.footer-legal {
  display: flex;
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-legal .footer-link {
  color: rgba(255, 255, 255, 0.6);
}

.footer-legal .footer-link:hover {
  color: var(--color-white);
}

.footer-icp {
  margin: 0;
}

@media (max-width: 1023px) and (min-width: 768px) {
  .header-masthead {
    padding: 2rem 1.5rem 1.25rem;
  }

  .nav-link {
    padding: 0.8rem 0.9rem;
    font-size: 0.8125rem;
  }

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

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 767px) {
  .header-topbar {
    padding-inline: 1rem;
  }

  .topbar-contact {
    display: none;
  }

  .header-masthead {
    padding: 1.75rem 1rem 1.25rem;
  }

  .brand-name {
    font-size: clamp(1.8rem, 9vw, 2.75rem);
  }

  .brand-tagline {
    font-size: 0.75rem;
  }

  .main-nav {
    justify-content: space-between;
    align-items: center;
    min-height: 3.5rem;
    padding: 0 0.75rem;
    border-top: 1px solid var(--color-border-deep);
  }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem;
    font-size: 0.75rem;
    color: var(--color-blue);
  }

  .nav-toggle-box {
    display: inline-flex;
    flex-direction: column;
    gap: 3px;
    width: 1.25rem;
  }

  .nav-toggle-bar {
    display: block;
    width: 100%;
    height: 2px;
    background: currentColor;
    border-radius: var(--radius-sm);
    transition: transform 0.3s ease, opacity 0.3s ease;
  }

  .main-nav[data-open="true"] .nav-toggle-bar:nth-child(1) {
    transform: translateY(5px) rotate(45deg);
  }

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

  .main-nav[data-open="true"] .nav-toggle-bar:nth-child(3) {
    transform: translateY(-5px) rotate(-45deg);
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: var(--color-bg);
    box-shadow: var(--shadow-nav);
    border-top: 1px solid var(--color-bg-alt);
  }

  .main-nav[data-open="true"] .nav-list {
    display: flex;
  }

  .nav-link {
    padding: 0.9rem 1.5rem;
    border-bottom: 1px solid var(--color-bg-alt);
    font-size: 1rem;
    border-bottom-color: var(--color-bg-alt);
  }

  .footer-main {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    padding-block: 2.5rem 2rem;
  }

  .footer-brand {
    grid-column: auto;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
    gap: 0.5rem;
  }

  .footer-legal {
    justify-content: center;
  }
}

html.js [data-reveal] {
  opacity: 0;
  transform: translateY(1.25rem);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

html.js [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

@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;
  }

  html.js [data-reveal],
  html.js [data-reveal].is-revealed {
    opacity: 1;
    transform: none;
    transition: none;
  }
}