:root {
  color-scheme: dark;
  --bg: #0a1930;
  --panel: #0e2340;
  --elevated: #132b4d;
  --accent: #ff6b35;
  --accent-2: #00d4ff;
  --text: #f5f8ff;
  --text-2: #b8c6e0;
  --text-3: #6f82a3;
  --border: rgba(0, 212, 255, 0.25);
  --border-strong: rgba(0, 212, 255, 0.45);
  --success: #37d67a;
  --header-h: 76px;
  --container: 1280px;
  --gutter: clamp(16px, 3vw, 32px);
  --font-head: "Exo 2", "Noto Sans SC", "PingFang SC", sans-serif;
  --font-body: "Source Serif SC", "Noto Serif SC", serif;
}

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

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

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--bg);
  background-image:
    linear-gradient(rgba(0, 212, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.045) 1px, transparent 1px);
  background-size: 48px 48px;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
}

main {
  display: block;
}

h1, h2, h3, h4 {
  margin: 0 0 0.5em;
  font-family: var(--font-head);
  color: var(--text);
  font-weight: 700;
  line-height: 1.2;
}

p {
  margin: 0 0 1em;
}

ul, ol {
  margin: 0;
  padding: 0;
}

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

button {
  font-family: inherit;
}

a {
  color: var(--accent-2);
}

::selection {
  background: rgba(255, 107, 53, 0.35);
  color: var(--text);
}

[hidden] {
  display: none !important;
}

[id] {
  scroll-margin-top: 96px;
}

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

.wrap {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.skip-link {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 300;
  display: inline-flex;
  align-items: center;
  padding: 10px 18px;
  background: var(--accent);
  color: #0a1930;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  transform: translateY(-120%);
  transition: transform 0.2s ease;
}

.skip-link:focus {
  transform: translateY(0);
  outline: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 25, 48, 0.92);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}

.site-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 24px);
  min-height: var(--header-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  text-decoration: none;
}

.brand__mark {
  position: relative;
  display: block;
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent) 52%, transparent 52.5%);
  border: 1px solid rgba(0, 212, 255, 0.5);
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
}

.brand__mark::after {
  content: '';
  position: absolute;
  right: 5px;
  bottom: 5px;
  width: 8px;
  height: 8px;
  background: var(--accent-2);
}

.brand__text {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
}

.brand__name {
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--text);
}

.brand__tag {
  font-family: var(--font-head);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent);
  border: 1px solid rgba(255, 107, 53, 0.6);
  padding: 2px 6px;
  clip-path: polygon(4px 0, 100% 0, 100% calc(100% - 4px), calc(100% - 4px) 100%, 0 100%, 0 4px);
}

.site-header__tagline {
  margin: 0;
  padding-left: clamp(12px, 2vw, 20px);
  border-left: 1px solid var(--border);
  font-family: var(--font-head);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-3);
  white-space: nowrap;
}

.site-header__coord {
  margin-left: clamp(8px, 1.5vw, 18px);
  font-family: var(--font-head);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--text-3);
  white-space: nowrap;
}

.site-nav {
  margin-left: auto;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav__item {
  margin: 0;
  padding: 0;
}

.site-nav__link {
  position: relative;
  display: inline-block;
  padding: 10px 14px;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text-2);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.15s ease;
}

.site-nav__link:hover {
  color: var(--text);
}

.site-nav__link::after {
  content: '';
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 5px;
  height: 2px;
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent-2) 100%);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.22s ease;
}

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

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

.site-nav__toggle {
  display: none;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  padding: 8px 12px;
  background: transparent;
  border: 1px solid var(--border);
  cursor: pointer;
  color: var(--text-2);
  font-family: var(--font-head);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.site-nav__toggle:hover {
  border-color: var(--accent-2);
}

.site-nav__toggle-icon {
  display: inline-flex;
  flex-direction: column;
  gap: 5px;
  width: 18px;
}

.site-nav__toggle-line {
  display: block;
  height: 2px;
  background: currentColor;
  transform-origin: center;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.site-nav__toggle.is-active .site-nav__toggle-line--top {
  transform: translateY(3.5px) rotate(45deg);
}

.site-nav__toggle.is-active .site-nav__toggle-line--bottom {
  transform: translateY(-3.5px) rotate(-45deg);
}

.site-nav__toggle-label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--text-2);
}

.site-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent-2) 100%);
  transform: scaleX(0);
  transform-origin: left center;
  pointer-events: none;
  z-index: 6;
}

.site-footer {
  position: relative;
  margin-top: clamp(56px, 10vw, 110px);
  overflow: hidden;
  background: #071225;
  border-top: 1px solid var(--border-strong);
}

.site-footer__diag {
  position: absolute;
  top: -1px;
  left: 0;
  width: 34%;
  height: 4px;
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent-2) 100%);
  transform: skewX(-24deg);
  transform-origin: left top;
  pointer-events: none;
}

.site-footer__inner {
  position: relative;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
  gap: clamp(24px, 4vw, 48px);
  padding: 52px 0 36px;
}

.site-footer__col {
  min-width: 0;
}

.site-footer__col--about .brand {
  margin-bottom: 16px;
}

.site-footer__heading {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--accent-2);
}

.site-footer__heading::before {
  content: '';
  width: 16px;
  height: 2px;
  flex-shrink: 0;
  background: var(--accent);
}

.site-footer__about,
.site-footer__note {
  margin: 0 0 12px;
  font-size: 13px;
  line-height: 1.8;
  color: var(--text-2);
}

.site-footer__note {
  color: var(--text-3);
  border-left: 2px solid var(--accent);
  padding-left: 10px;
}

.site-footer__trust {
  margin: 16px 0 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--text-3);
}

.site-footer__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-footer__list li {
  margin: 0;
}

.site-footer__list a {
  display: inline-block;
  font-size: 14px;
  line-height: 2.2;
  color: var(--text-2);
  text-decoration: none;
  transition: color 0.15s ease, transform 0.15s ease;
}

.site-footer__list a:hover {
  color: var(--accent-2);
  transform: translateX(3px);
}

.site-footer__list--contact {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.site-footer__contact-item {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-2);
}

.site-footer__contact-item::before {
  content: '//';
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-head);
  font-size: 11px;
  color: var(--accent);
}

.site-footer__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 16px;
  border-top: 1px solid rgba(0, 212, 255, 0.14);
  padding: 16px 0 22px;
}

.site-footer__icp,
.site-footer__copyright {
  margin: 0;
  font-family: var(--font-head);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--text-3);
}

.brand--footer {
  gap: 14px;
}

.brand--footer .brand__mark {
  width: 42px;
  height: 42px;
}

.brand--footer .brand__name {
  font-size: 24px;
}

.brand--footer .brand__tag {
  font-size: 12px;
}

.panel {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--border);
  padding: clamp(20px, 3vw, 36px);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
}

.card {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--border);
  padding: clamp(18px, 2.5vw, 28px);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 14px 100%, 0 calc(100% - 14px));
}

.card--elevated {
  background: var(--elevated);
  border-color: var(--border-strong);
  box-shadow: 0 20px 44px rgba(2, 8, 20, 0.5);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 24px;
  border: 1px solid var(--border-strong);
  background: transparent;
  color: var(--text);
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.05em;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.btn--primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #0a1930;
}

.btn--primary:hover {
  background: #ff8a5c;
  border-color: #ff8a5c;
}

.btn--ghost {
  color: var(--accent-2);
}

.btn--ghost:hover {
  background: rgba(0, 212, 255, 0.08);
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 24px;
}

.filter-btn {
  display: inline-flex;
  align-items: center;
  padding: 8px 18px;
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--text-2);
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  cursor: pointer;
  clip-path: polygon(6px 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%, 0 6px);
  transition: background 0.16s ease, color 0.16s ease, border-color 0.16s ease;
}

.filter-btn:hover {
  color: var(--text);
  border-color: var(--accent-2);
}

.filter-btn.is-active {
  background: var(--accent);
  border-color: var(--accent);
  color: #0a1930;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 24px 0 6px;
  font-family: var(--font-head);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--text-3);
}

.breadcrumbs__sep {
  opacity: 0.5;
}

.breadcrumbs a {
  color: var(--text-2);
  text-decoration: none;
}

.breadcrumbs a:hover {
  color: var(--accent-2);
}

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

.page-title {
  margin: 6px 0 12px;
  font-family: var(--font-head);
  font-size: clamp(34px, 5.4vw, 60px);
  font-weight: 800;
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--text);
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--accent-2);
}

.kicker::before {
  content: '';
  width: 22px;
  height: 2px;
  background: var(--accent);
}

.kicker::after {
  content: '//';
  opacity: 0.5;
}

.aside-note {
  margin: 0;
  padding-left: 14px;
  border-left: 2px solid var(--accent);
  font-family: var(--font-head);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.06em;
  color: var(--text-3);
}

.vertical-note {
  margin: 0;
  writing-mode: vertical-rl;
  font-family: var(--font-head);
  font-size: 11px;
  letter-spacing: 0.28em;
  color: var(--text-3);
  text-transform: uppercase;
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-head);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--text-2);
}

.legend__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.legend__swatch {
  display: inline-block;
  width: 10px;
  height: 10px;
  flex-shrink: 0;
}

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

.legend__swatch--blue {
  background: var(--accent-2);
}

.legend__swatch--panel {
  background: var(--panel);
  border: 1px solid var(--border-strong);
}

.route-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-head);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-3);
}

.route-meta__item {
  display: inline-flex;
  align-items: center;
}

.route-meta__item::before {
  content: '◤';
  margin-right: 7px;
  font-size: 10px;
  color: var(--accent-2);
}

.media-frame {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  border: 1px solid var(--border);
  background:
    linear-gradient(135deg, rgba(0, 212, 255, 0.08) 0%, transparent 32%),
    linear-gradient(320deg, rgba(255, 107, 53, 0.10) 0%, transparent 40%),
    radial-gradient(120% 130% at 80% 10%, var(--elevated) 0%, var(--panel) 70%);
}

.media-frame::before {
  content: 'IMG / DATA';
  position: absolute;
  top: 12px;
  left: 14px;
  z-index: 2;
  font-family: var(--font-head);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.22em;
  color: var(--accent-2);
  opacity: 0.8;
  text-transform: uppercase;
}

.media-frame::after {
  content: '';
  display: block;
  padding-top: 56.25%;
}

.media-frame--16x9::after {
  padding-top: 56.25%;
}

.media-frame--4x3::after {
  padding-top: 75%;
}

.media-frame--1x1::after {
  padding-top: 100%;
}

.media-frame > img,
.media-frame > picture,
.media-frame > video,
.media-frame > div {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.divider-diag {
  position: relative;
  height: 1px;
  margin: 40px 0;
  overflow: hidden;
}

.divider-diag::before {
  content: '';
  position: absolute;
  left: -2%;
  right: -2%;
  height: 2px;
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent-2) 45%, transparent 80%);
  transform: skewX(-24deg);
  transform-origin: left center;
}

.js [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.35s ease, transform 0.35s ease;
}

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

@media (max-width: 1240px) {
  .site-header__tagline {
    display: none;
  }
}

@media (max-width: 1024px) {
  .site-header__coord {
    display: none;
  }

  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 860px) {
  :root {
    --header-h: 64px;
  }

  .site-nav__toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: calc(100% - 1px);
    left: var(--gutter);
    right: var(--gutter);
    margin: 0;
    padding: 10px 0;
    background: var(--elevated);
    border: 1px solid var(--border-strong);
    box-shadow: 0 24px 60px rgba(2, 8, 20, 0.45);
    clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 16px 100%, 0 calc(100% - 16px));
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: transform 0.2s ease, opacity 0.2s ease, visibility 0.2s ease;
  }

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

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-nav__link {
    display: block;
    padding: 13px 18px;
    border-bottom: 1px solid rgba(0, 212, 255, 0.12);
  }

  .site-nav__link::after {
    display: none;
  }

  .site-nav__item:last-child .site-nav__link {
    border-bottom: 0;
  }
}

@media (max-width: 560px) {
  .site-footer__grid {
    grid-template-columns: 1fr;
    padding: 36px 0 28px;
  }

  .site-footer__meta {
    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;
  }

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

  .site-nav {
    transition: none;
  }
}