:root {
  --c-bg: #0A2540;
  --c-bg-2: #12395C;
  --c-bg-3: #1B1F3B;
  --c-panel: #EAF2F8;
  --c-accent: #FFD166;
  --c-accent-strong: #F0B429;
  --c-accent-2: #F85A2A;
  --c-text: #EAF2F8;
  --c-text-strong: #FFFFFF;
  --c-muted: #8D9AA5;
  --c-line: rgba(234, 242, 248, 0.16);
  --c-line-soft: rgba(234, 242, 248, 0.08);
  --font-head: "Roboto Condensed", "Arial Narrow", "DIN Condensed", "Helvetica Neue", Arial, sans-serif;
  --font-body: "Source Sans 3", "Segoe UI", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "Fira Code", "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --container: 1400px;
  --gutter: clamp(1rem, 3vw, 2.5rem);
  --header-h: 72px;
  --radius: 10px;
  --transition: 160ms cubic-bezier(0.2, 0.7, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  background: var(--c-bg);
  color: var(--c-text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

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

ul,
ol {
  list-style: none;
}

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

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

h1,
h2,
h3,
h4 {
  font-family: var(--font-head);
  font-weight: 700;
  color: var(--c-text-strong);
  line-height: 1.15;
  text-wrap: balance;
}

h1 {
  font-size: clamp(2.75rem, 6vw, 4.5rem);
  letter-spacing: -0.01em;
  margin-bottom: 1rem;
}

h2 {
  font-size: clamp(2rem, 3.6vw, 3rem);
  margin-bottom: 0.85rem;
}

h3 {
  font-size: clamp(1.35rem, 2vw, 1.9rem);
  margin-bottom: 0.5rem;
}

p {
  margin-bottom: 1rem;
}

.container {
  width: min(calc(100% - 2 * var(--gutter)), var(--container));
  margin-inline: auto;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

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

.text-accent {
  color: var(--c-accent);
}

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

.skip-link {
  position: fixed;
  top: 0;
  left: var(--gutter);
  z-index: 2000;
  display: inline-block;
  padding: 0.7rem 1.1rem;
  background: var(--c-accent);
  color: var(--c-bg);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  border-radius: 0 0 6px 6px;
  transform: translateY(-150%);
  transition: transform var(--transition);
}

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

:focus:not(:focus-visible) {
  outline: none;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.72rem 1.35rem;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.875rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
  border: 1px solid transparent;
  transition: transform var(--transition), box-shadow var(--transition), background-color var(--transition), color var(--transition);
}

.btn--accent {
  background: var(--c-accent);
  color: var(--c-bg);
}

.btn--accent::after {
  content: "";
  width: 0.55em;
  height: 0.55em;
  border-top: 2px solid currentColor;
  border-right: 2px solid currentColor;
  transform: rotate(45deg);
  transition: transform var(--transition);
}

.btn--accent:hover {
  background: var(--c-accent-strong);
  transform: translateY(-1px);
  box-shadow: 0 8px 22px -8px rgba(255, 209, 102, 0.5);
}

.btn--accent:hover::after {
  transform: rotate(45deg) translate(2px, -2px);
}

.btn--outline {
  border-color: var(--c-line);
  color: var(--c-accent);
}

.btn--outline:hover {
  border-color: var(--c-accent);
  background: rgba(255, 209, 102, 0.08);
}

.btn--ghost {
  color: var(--c-text);
}

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

.status-dot {
  display: inline-block;
  flex: none;
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 999px;
  background: var(--c-accent-2);
  animation: statusPulse 2.4s ease-in-out infinite;
}

@keyframes statusPulse {
  0% {
    box-shadow: 0 0 0 0 rgba(248, 90, 42, 0.35);
  }
  70% {
    box-shadow: 0 0 0 8px rgba(248, 90, 42, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(248, 90, 42, 0);
  }
}

.site-header {
  position: -webkit-sticky;
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 37, 64, 0.94);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  box-shadow: 0 1px 0 var(--c-line);
}

.header-inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2.5vw, 2.5rem);
  min-height: var(--header-h);
  padding-block: 0.75rem;
}

.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  flex: none;
}

.brand-badge {
  display: grid;
  place-items: center;
  width: 2.6rem;
  height: 2.6rem;
  background: var(--c-accent);
  color: var(--c-bg);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.05rem;
  clip-path: polygon(0 0, 78% 0, 100% 22%, 100% 100%, 0 100%);
  transition: background-color var(--transition), transform var(--transition);
}

.brand-lockup:hover .brand-badge {
  background: var(--c-accent-strong);
  transform: translateY(-1px);
}

.brand-copy {
  display: grid;
  gap: 0.1rem;
  line-height: 1.2;
}

.brand-name {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.4rem;
  color: var(--c-text-strong);
  letter-spacing: 0.02em;
}

.brand-name__accent {
  color: var(--c-accent);
}

.brand-meta {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  color: var(--c-muted);
  text-transform: uppercase;
}

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

.nav-list {
  display: flex;
  align-items: center;
  gap: min(1.75rem, 2.2vw);
}

.nav-item {
  position: relative;
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.85rem 0.1rem;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.98rem;
  letter-spacing: 0.04em;
  color: var(--c-text);
  transition: color var(--transition);
}

.nav-link::before {
  content: "//";
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 400;
  letter-spacing: -0.08em;
  color: var(--c-muted);
  transition: color var(--transition);
}

.nav-link__idx {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--c-accent-2);
  opacity: 0.85;
}

.nav-link:hover {
  color: var(--c-text-strong);
}

.nav-link:hover::before {
  color: var(--c-accent);
}

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

.nav-link[aria-current="page"]::before {
  color: var(--c-accent-2);
}

.nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.6rem;
  height: 2px;
  background: var(--c-accent);
}

.nav-link--cta::before,
.nav-link--cta::after {
  display: none;
}

.nav-item--mobile,
.nav-toggle {
  display: none;
}

.header-cta {
  flex: none;
}

.header-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 0%;
  height: 2px;
  background: linear-gradient(90deg, var(--c-accent), var(--c-accent-2));
  z-index: 2;
  transition: width 120ms linear;
}

.site-footer {
  position: relative;
  margin-top: clamp(4rem, 10vw, 8rem);
  background: var(--c-bg-3);
  color: var(--c-muted);
  border-top: 1px solid var(--c-line);
}

.site-footer::before {
  content: "";
  display: block;
  height: 3px;
  background: linear-gradient(90deg, var(--c-accent) 0px, var(--c-accent) 72px, rgba(255, 209, 102, 0.25) 72px, rgba(255, 209, 102, 0.25) 74px, transparent 74px);
}

.footer-main {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  padding-block: clamp(2.5rem, 5vw, 4.5rem) 2.5rem;
}

.footer-brand .brand-lockup {
  margin-bottom: 1.1rem;
}

.footer-statement {
  max-width: 34rem;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--c-muted);
}

.footer-title {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: 1rem;
}

.footer-links a,
.footer-legal a {
  display: block;
  padding: 0.32rem 0;
  color: var(--c-text);
  font-size: 0.95rem;
  transition: color var(--transition), padding-left var(--transition);
}

.footer-links a:hover,
.footer-legal a:hover {
  color: var(--c-accent);
  padding-left: 0.35rem;
}

.footer-contact__line {
  display: block;
  padding: 0.3rem 0;
  color: var(--c-text);
  font-size: 0.95rem;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem 1.5rem;
  padding-block: 1.25rem 1.6rem;
  border-top: 1px solid var(--c-line-soft);
  font-size: 0.85rem;
  color: var(--c-muted);
}

.footer-accent-line {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--c-accent-2);
}

.back-to-top {
  position: fixed;
  right: clamp(0.75rem, 2vw, 1.5rem);
  bottom: clamp(0.75rem, 2vw, 1.5rem);
  z-index: 90;
  display: grid;
  place-items: center;
  width: 3rem;
  height: 3rem;
  background: var(--c-accent);
  color: var(--c-bg);
  border-radius: 4px;
  opacity: 0;
  transform: translateY(0.75rem);
  pointer-events: none;
  transition: opacity var(--transition), transform var(--transition);
}

.back-to-top.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.back-to-top:hover {
  background: var(--c-accent-strong);
}

.back-to-top__icon {
  font-size: 1.15rem;
  line-height: 1;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.6rem;
  padding-block: 0.9rem 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--c-muted);
}

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 0.6rem;
  color: var(--c-muted);
  opacity: 0.7;
}

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

.section-head {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 1.75rem;
}

.section-head__idx {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--c-accent);
}

.section-head__title {
  margin-bottom: 0;
}

.section-head__line {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--c-line), transparent);
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3.5rem);
  align-items: start;
}

.grid--2,
.grid--3,
.grid--4 {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1rem, 2.2vw, 1.75rem);
}

.cut-panel {
  position: relative;
  padding: clamp(1.5rem, 3.5vw, 3rem);
  background: var(--c-bg-2);
  clip-path: polygon(0 0, calc(100% - 1.75rem) 0, 100% 1.75rem, 100% 100%, 0 100%);
}

.cut-panel--light {
  background: var(--c-panel);
  color: var(--c-bg);
}

.cut-panel--light h1,
.cut-panel--light h2,
.cut-panel--light h3 {
  color: var(--c-bg);
}

.data-group {
  display: grid;
  gap: 0.15rem;
}

.data-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2rem, 5vw, 3.5rem);
  line-height: 1;
  color: var(--c-accent);
}

.data-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-muted);
}

.slat {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 1rem;
  padding: 1.05rem 0;
  border-bottom: 1px solid var(--c-line);
}

.slat__idx {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--c-accent-2);
}

.slat__title {
  font-weight: 700;
  color: var(--c-text-strong);
}

.slat__meta {
  font-size: 0.85rem;
  color: var(--c-muted);
}

.slat__value {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--c-accent);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.3rem 0.65rem;
  border: 1px solid var(--c-line);
  background: rgba(255, 209, 102, 0.06);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-accent);
}

.tag::before {
  content: "";
  width: 0.35rem;
  height: 0.35rem;
  background: var(--c-accent-2);
}

.img-frame {
  position: relative;
  display: block;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: linear-gradient(135deg, #12395C 0%, #0A2540 55%, #1B1F3B 100%);
}

.img-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 240ms ease;
}

.img-frame:hover img {
  transform: scale(1.03);
}

@media (min-width: 768px) {
  .footer-main {
    grid-template-columns: 1fr 1fr;
  }

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

  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .split {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  }

  .footer-main {
    grid-template-columns: 2fr 1fr 1fr 1.4fr;
  }

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

  .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));
  }
}

@media (max-width: 1023px) {
  .header-inner {
    min-height: 64px;
  }

  .main-nav {
    position: absolute;
    top: calc(100% - 1px);
    left: 0;
    right: 0;
    display: none;
    background: linear-gradient(180deg, var(--c-bg-2), var(--c-bg));
    border-bottom: 1px solid var(--c-line);
    box-shadow: 0 32px 48px -24px rgba(0, 0, 0, 0.55);
  }

  .main-nav[data-open] {
    display: block;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    max-height: calc(100vh - 64px - 1rem);
    overflow-y: auto;
    padding: 0.25rem var(--gutter) 1.25rem;
  }

  .nav-item {
    border-bottom: 1px solid var(--c-line-soft);
  }

  .nav-item:last-of-type {
    border-bottom: none;
  }

  .nav-link {
    width: 100%;
    padding: 0.9rem 0.25rem;
    font-size: 1.02rem;
  }

  .nav-item--mobile {
    display: block;
    padding-top: 0.85rem;
  }

  .nav-item--mobile .nav-link {
    justify-content: center;
    background: var(--c-accent);
    color: var(--c-bg);
    padding: 0.85rem 1rem;
  }

  .nav-item--mobile .nav-link:hover {
    background: var(--c-accent-strong);
  }

  .nav-toggle {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    width: 2.75rem;
    height: 2.75rem;
    margin-left: auto;
    flex: none;
    background: rgba(18, 57, 92, 0.6);
    border: 1px solid var(--c-line);
    border-radius: 4px;
  }

  .nav-toggle__line {
    width: 1.25rem;
    height: 2px;
    background: var(--c-accent);
    border-radius: 2px;
    transition: transform 200ms ease, opacity 200ms ease;
  }

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

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

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

  .header-cta {
    display: none;
  }
}

@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;
  }

  .status-dot {
    animation: none;
  }

  .header-progress {
    transition: none;
  }

  .nav-toggle__line {
    transition: none;
  }

  .img-frame img {
    transition: none;
  }
}