:root {
  --navy-900: #0A1428;
  --navy-800: #0B1B3D;
  --navy-700: #1E3A5F;
  --accent: #FF6B35;
  --silver: #C0C0C0;
  --white: #FFFFFF;
  --dim: #B0BEC5;
  --success: #2ECC71;
  --warning: #FFC145;
  --error: #E74C3C;
  --font-display: "Oswald", "Arial Narrow", "Impact", "Noto Sans SC", sans-serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
  --font-mono: "Roboto Mono", "SFMono-Regular", "Consolas", monospace;
  --header-width: 260px;
  --header-mobile-height: 60px;
  --container: 1200px;
  --space: clamp(1rem, 2.2vw, 1.75rem);
  --panel-border: rgba(192, 192, 192, 0.18);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--navy-900);
}

body {
  min-height: 100vh;
  margin: 0;
  padding-left: var(--header-width);
  display: flex;
  flex-direction: column;
  background:
    radial-gradient(1200px 700px at 85% -10%, rgba(255, 107, 53, 0.10), transparent 60%),
    linear-gradient(150deg, #0A1428 0%, #0B1B3D 48%, #0A1428 100%);
  color: var(--white);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

main,
footer {
  position: relative;
}

#main-content {
  flex: 1;
  outline: none;
  scroll-margin-top: calc(var(--header-mobile-height) + 10px);
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

button {
  font: inherit;
  color: inherit;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 50%;
  transform: translateX(-50%) translateY(-220%);
  z-index: 3000;
  background: var(--accent);
  color: var(--navy-900);
  padding: 8px 16px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-decoration: none;
  border: 1px solid rgba(255, 255, 255, 0.4);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.3);
}

.skip-link:focus {
  transform: translateX(-50%) translateY(0);
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--accent), var(--warning));
  z-index: 3000;
  pointer-events: none;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--header-width);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  background: linear-gradient(180deg, #0A1428 0%, #0B1B3D 100%);
  border-right: 1px solid var(--panel-border);
  box-shadow: 1px 0 0 rgba(255, 107, 53, 0.08);
}

.header-inner {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 28px 20px 20px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 107, 53, 0.6) rgba(255, 255, 255, 0.04);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 4px 4px;
  margin-bottom: 24px;
  text-decoration: none;
  color: var(--white);
}

.brand-mark {
  position: relative;
  width: 42px;
  height: 42px;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  border: 1px solid rgba(192, 192, 192, 0.6);
  border-radius: 50%;
}

.brand-mark::before {
  content: "";
  position: absolute;
  inset: 6px;
  border: 1px dashed rgba(255, 107, 53, 0.7);
  border-radius: 50%;
}

.brand-mark::after {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px rgba(255, 107, 53, 0.8);
}

.brand-copy {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--white);
}

.brand-tag {
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  letter-spacing: 0.18em;
  color: var(--dim);
  text-transform: uppercase;
}

.nav-toggle {
  display: none;
}

.site-nav {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 12px;
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  font-size: 0.9375rem;
  color: var(--dim);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.nav-index {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.08em;
  color: var(--accent);
  opacity: 0.75;
  min-width: 18px;
}

.nav-link:hover,
.nav-link:focus-visible {
  background: rgba(255, 255, 255, 0.03);
  color: var(--white);
  border-left-color: rgba(255, 107, 53, 0.5);
}

.nav-link[aria-current="page"] {
  background: linear-gradient(90deg, rgba(255, 107, 53, 0.14) 0%, rgba(30, 58, 95, 0) 90%);
  color: var(--white);
  border-left-color: var(--accent);
}

.nav-link[aria-current="page"] .nav-index {
  opacity: 1;
  color: var(--accent);
}

.nav-cta {
  position: relative;
  margin-top: auto;
  display: block;
  text-align: center;
  padding: 12px 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.9375rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--navy-900);
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: linear-gradient(135deg, var(--accent), #FF8C42);
  box-shadow: 0 6px 18px rgba(255, 107, 53, 0.2);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(255, 107, 53, 0.3);
}

.nav-cta:focus-visible {
  outline: 2px solid var(--silver);
  outline-offset: 3px;
}

.coord-display {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px dashed rgba(192, 192, 192, 0.25);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.coord-display__label {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--accent);
}

.coord-display__value {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--dim);
}

.site-footer {
  flex-shrink: 0;
  padding: clamp(2.5rem, 6vw, 5rem) clamp(1.25rem, 4vw, 4rem) 1.5rem;
  background: linear-gradient(180deg, #0A1428 0%, rgba(10, 20, 40, 0.98) 100%);
  border-top: 1px solid var(--panel-border);
  color: var(--dim);
  position: relative;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent) 0%, rgba(255, 107, 53, 0) 40%, rgba(192, 192, 192, 0.5) 100%);
}

.footer-grid {
  max-width: var(--container);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr) minmax(0, 1.4fr) minmax(0, 1fr);
  gap: clamp(2rem, 4vw, 3.5rem);
  align-items: start;
}

.footer-brand {
  display: grid;
  gap: 0.75rem;
}

.footer-brand__name {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--white);
  text-decoration: none;
  letter-spacing: 0.04em;
}

.footer-brand__desc {
  margin: 0;
  max-width: 36ch;
  font-size: 0.875rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.72);
}

.footer-brand__site {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: rgba(176, 190, 197, 0.7);
}

.footer-nav {
  display: grid;
  gap: 1rem;
}

.footer-title {
  margin: 0 0 0.75rem;
  padding-left: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--silver);
  border-left: 2px solid var(--accent);
}

.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
}

.footer-link {
  display: inline-block;
  color: var(--dim);
  font-size: 0.875rem;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.footer-link:hover {
  color: var(--white);
  border-bottom-color: var(--accent);
}

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

.footer-contact {
  margin: 0;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--dim);
}

.footer-meta {
  display: grid;
  gap: 0.625rem;
  align-content: start;
}

.footer-status {
  margin: 0;
  display: flex;
  align-items: center;
  font-size: 0.8125rem;
  color: var(--dim);
}

.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 8px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 8px rgba(46, 204, 113, 0.7);
}

.footer-signal {
  margin: 0;
  padding-left: 0.75rem;
  border-left: 1px solid rgba(255, 107, 53, 0.6);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: rgba(176, 190, 197, 0.82);
}

.footer-signal [data-year] {
  font-variant-numeric: tabular-nums;
}

.footer-icp {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: rgba(176, 190, 197, 0.65);
}

.to-top {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 500;
  padding: 10px 14px;
  border: 1px solid rgba(255, 107, 53, 0.6);
  background: rgba(11, 27, 61, 0.85);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease, transform 0.25s ease, background 0.25s ease, color 0.25s ease;
}

html[data-scrolled="true"] .to-top {
  opacity: 1;
  visibility: visible;
}

.to-top:hover {
  background: var(--accent);
  color: var(--navy-900);
  transform: translateY(-2px);
}

.content-container {
  width: calc(100% - clamp(2rem, 6vw, 4rem));
  max-width: var(--container);
  margin-inline: auto;
}

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

.section--tight {
  padding-block: 2rem;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
}

.section-label::before {
  content: "";
  width: 24px;
  height: 1px;
  background: var(--accent);
}

.breadcrumb {
  margin: 0;
  padding: 1rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--dim);
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.375rem 0.75rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
}

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  color: var(--accent);
  opacity: 0.7;
}

.breadcrumb__link {
  color: var(--dim);
  text-decoration: none;
}

.breadcrumb__link:hover,
.breadcrumb__link[aria-current="page"] {
  color: var(--accent);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  border: 1px solid rgba(255, 107, 53, 0.6);
  background: transparent;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.btn:hover {
  background: rgba(255, 107, 53, 0.12);
  transform: translateY(-2px);
}

.btn--primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--navy-900);
  font-weight: 700;
}

.btn--primary:hover {
  background: #FF8752;
  color: var(--navy-900);
}

.glass-card {
  position: relative;
  padding: clamp(1rem, 2.5vw, 1.5rem);
  border: 1px solid var(--panel-border);
  border-radius: 2px;
  background: rgba(30, 58, 95, 0.34);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.glass-card:hover {
  border-color: rgba(255, 107, 53, 0.35);
}

.bento-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space);
}

.bento-card {
  position: relative;
  grid-column: span 4;
  padding: clamp(1rem, 2.5vw, 1.5rem);
  background: linear-gradient(145deg, rgba(30, 58, 95, 0.42), rgba(11, 27, 61, 0.66));
  border: 1px solid var(--panel-border);
  border-top: 2px solid transparent;
  border-radius: 2px;
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.bento-card:hover {
  border-color: rgba(255, 107, 53, 0.4);
  transform: translateY(-3px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.25);
}

.bento-card--wide {
  grid-column: span 8;
}

.bento-card--full {
  grid-column: 1 / -1;
}

.bento-card--accent {
  border-top-color: var(--accent);
}

.metric-card {
  padding: 1.25rem;
  background: linear-gradient(135deg, rgba(30, 58, 95, 0.5), rgba(11, 27, 61, 0.4));
  border: 1px solid var(--panel-border);
  border-left: 3px solid var(--accent);
  border-radius: 2px;
}

.metric-value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  line-height: 1;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.metric-label {
  margin: 0.5rem 0 0;
  font-size: 0.875rem;
  letter-spacing: 0.04em;
  color: var(--dim);
}

.data-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.65rem;
  border: 1px solid rgba(192, 192, 192, 0.22);
  border-left-color: var(--accent);
  background: rgba(11, 27, 61, 0.72);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--dim);
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.625rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  color: var(--dim);
}

.legend__item {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
}

.legend__key {
  width: 8px;
  height: 8px;
  background: var(--silver);
  border-radius: 1px;
}

.legend__key--accent {
  background: var(--accent);
}

.legend__key--line {
  height: 2px;
  width: 14px;
  background: var(--accent);
}

.frame-window {
  position: relative;
  padding: clamp(1rem, 3vw, 2rem);
  border: 1px solid var(--panel-border);
  background: linear-gradient(145deg, rgba(30, 58, 95, 0.28), rgba(11, 27, 61, 0.5));
}

.frame-window::before {
  content: "";
  position: absolute;
  inset: 6px;
  border: 1px solid rgba(255, 107, 53, 0.18);
  pointer-events: none;
}

.frame-window::after {
  content: attr(data-coord);
  position: absolute;
  top: -0.5em;
  right: 12px;
  padding: 0 0.5em;
  background: var(--navy-900);
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.12em;
  color: var(--accent);
}

.image-frame {
  position: relative;
  display: block;
  min-height: 220px;
  overflow: hidden;
  border: 1px solid var(--panel-border);
  background: linear-gradient(140deg, rgba(30, 58, 95, 0.5), rgba(11, 27, 61, 0.8));
}

.image-frame::before {
  content: "";
  position: absolute;
  top: -10%;
  bottom: -10%;
  right: -10%;
  width: 60%;
  background: linear-gradient(180deg, rgba(255, 107, 53, 0.22), rgba(255, 255, 255, 0.02) 70%);
  transform: skewX(-12deg);
  pointer-events: none;
}

.image-frame::after {
  content: attr(data-index);
  position: absolute;
  left: 10px;
  bottom: 10px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--silver);
}

.image-frame--wide {
  min-height: 280px;
}

.image-frame--portrait {
  min-height: 340px;
}

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

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space);
}

.js [data-reveal] {
  transition: opacity 0.45s ease, transform 0.45s ease;
}

.js [data-reveal]:not([data-visible]) {
  opacity: 0;
  transform: translateY(14px);
}

[data-reveal][data-visible] {
  opacity: 1;
  transform: none;
}

@media (min-width: 900px) {
  #main-content {
    scroll-margin-top: 0;
  }
}

@media (min-width: 900px) and (max-width: 1199px) {
  :root {
    --header-width: 220px;
  }

  .header-inner {
    padding: 20px 16px;
  }

  .brand-tag {
    font-size: 0.5rem;
  }

  .coord-display__value {
    font-size: 0.625rem;
  }
}

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

  .site-header {
    top: 0;
    left: 0;
    right: 0;
    bottom: auto;
    width: auto;
    height: var(--header-mobile-height);
    border-right: none;
    border-bottom: 1px solid var(--panel-border);
    background: rgba(10, 20, 40, 0.92);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
  }

  .header-inner {
    position: relative;
    z-index: 1100;
    flex-direction: row;
    align-items: center;
    gap: 8px;
    padding: 0 12px;
  }

  .brand {
    margin: 0;
    flex: 1 1 auto;
  }

  .brand-mark {
    width: 32px;
    height: 32px;
  }

  .brand-mark::before {
    inset: 4px;
  }

  .brand-name {
    font-size: 1.1rem;
  }

  .nav-toggle {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    width: 44px;
    height: 44px;
    margin-left: auto;
    padding: 0;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 2px;
    cursor: pointer;
    color: var(--white);
  }

  .nav-toggle__bar {
    display: block;
    width: 18px;
    height: 2px;
    background: currentColor;
    transition: transform 0.2s ease, opacity 0.2s ease;
  }

  .nav-toggle__label {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }

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

  .nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }

  .site-nav {
    position: fixed;
    top: var(--header-mobile-height);
    left: 0;
    bottom: 0;
    width: min(88vw, 360px);
    z-index: 1000;
    margin: 0;
    padding: 24px;
    background: linear-gradient(180deg, #0A1428 0%, #0B1B3D 100%);
    border-right: 1px solid var(--panel-border);
    box-shadow: 8px 0 28px rgba(0, 0, 0, 0.35);
    transform: translateX(-100%);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: transform 0.25s ease, opacity 0.2s ease, visibility 0s linear 0.25s;
  }

  .site-nav[data-open] {
    transform: translateX(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transition: transform 0.25s ease, opacity 0.2s ease;
  }

  body.nav-open {
    overflow: hidden;
  }

  .coord-display {
    display: none;
  }

  .nav-cta {
    margin-top: auto;
  }

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

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

  .footer-nav,
  .footer-coordinate,
  .footer-meta {
    padding-top: 0.5rem;
  }

  .to-top {
    right: 14px;
    bottom: 14px;
  }

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

  .bento-card,
  .bento-card--wide {
    grid-column: span 1;
  }
}

@media (min-width: 900px) and (max-width: 1199px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@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;
  }

  .js [data-reveal]:not([data-visible]) {
    opacity: 1;
    transform: none;
  }
}