:root {
  --color-obsidian: #0A0A0F;
  --color-carbon: #14141C;
  --color-graphite: #23232F;
  --color-gold: #D4A843;
  --color-gold-bright: #F0C05A;
  --color-tech-blue: #2A6DB5;
  --color-electric-blue: #4A9FF5;
  --color-off-white: #F5F5F6;
  --color-muted-gray: #9A9AA5;
  --color-success: #39C76A;
  --color-danger: #E64A4A;
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Menlo", "Consolas", monospace;
  --header-height: 72px;
  --footer-top-space: 64px;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  background: var(--color-obsidian);
  color: var(--color-off-white);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

body[data-nav-open] {
  overflow: hidden;
}

ul,
ol {
  list-style: none;
}

a {
  color: var(--color-tech-blue);
  text-decoration: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--color-off-white);
}

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

button {
  font-family: inherit;
  font-size: 100%;
  background: none;
  border: none;
  color: inherit;
  cursor: pointer;
}

:focus-visible {
  outline: 2px solid var(--color-electric-blue);
  outline-offset: 2px;
}

::selection {
  background: var(--color-gold);
  color: var(--color-obsidian);
}

.container {
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: 24px;
}

.skip-link {
  position: fixed;
  top: -100px;
  left: 16px;
  z-index: 2000;
  padding: 12px 20px;
  background: var(--color-gold);
  color: var(--color-obsidian);
  font-weight: 700;
  font-size: 14px;
  line-height: 1;
  text-decoration: none;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 16px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--color-obsidian);
}

.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, rgba(212, 168, 67, 0.65) 0%, rgba(212, 168, 67, 0.65) 16%, rgba(42, 109, 181, 0.55) 16%, rgba(42, 109, 181, 0.55) 26%, rgba(255, 255, 255, 0.05) 26%);
  pointer-events: none;
}

.site-header__inner {
  max-width: 1280px;
  margin-inline: auto;
  padding-inline: 24px;
  height: var(--header-height);
  display: flex;
  align-items: center;
  gap: 20px;
}

.site-brand__link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--color-off-white);
  flex-shrink: 0;
}

.site-brand__mark {
  display: inline-block;
  width: 32px;
  height: 32px;
  background: var(--color-gold);
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 0 100%);
  position: relative;
  transition: background-color 0.2s ease;
}

.site-brand__mark::after {
  content: "";
  position: absolute;
  top: 12px;
  left: -4px;
  width: calc(100% + 8px);
  height: 3px;
  background: var(--color-electric-blue);
  transform: rotate(-18deg);
}

.site-brand__link:hover .site-brand__mark {
  background: var(--color-gold-bright);
}

.site-brand__text {
  font-size: 20px;
  font-weight: 900;
  letter-spacing: 0.06em;
  line-height: 1;
  white-space: nowrap;
}

.site-brand__dot {
  color: var(--color-gold);
}

.site-nav {
  margin-left: 12px;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.site-nav__item {
  list-style: none;
}

.site-nav__link {
  display: inline-block;
  padding: 10px 14px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--color-muted-gray);
  text-decoration: none;
  position: relative;
  transition: color 0.2s ease;
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 4px;
  height: 2px;
  background: var(--color-gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

.site-nav__link:hover,
.site-nav__link[aria-current="page"] {
  color: var(--color-off-white);
}

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

.site-header__actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background: rgba(57, 199, 106, 0.08);
  border: 1px solid rgba(57, 199, 106, 0.35);
  clip-path: polygon(0 0, calc(100% - 6px) 0, 100% 6px, 100% 100%, 0 100%);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--color-success);
  line-height: 1;
  white-space: nowrap;
}

.status-badge__dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-success);
  box-shadow: 0 0 6px rgba(57, 199, 106, 0.6);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1;
  text-decoration: none;
  border: none;
  cursor: pointer;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
  transition: background-color 0.2s ease, color 0.2s ease, transform 0.1s ease;
}

.btn--gold {
  background: var(--color-gold);
  color: var(--color-obsidian);
}

.btn--gold:hover {
  background: var(--color-gold-bright);
  color: var(--color-obsidian);
  transform: translateY(-1px);
}

.btn--ghost {
  background: transparent;
  color: var(--color-off-white);
  border: 1px solid var(--color-graphite);
}

.btn--ghost:hover {
  background: var(--color-graphite);
  color: var(--color-gold);
}

.btn__label {
  line-height: 1;
}

.btn__arrow {
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  border: 1px solid rgba(212, 168, 67, 0.4);
  background: var(--color-obsidian);
  gap: 5px;
  padding: 0;
}

.nav-toggle__line {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-gold);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle:hover .nav-toggle__line {
  background: var(--color-gold-bright);
}

.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);
}

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  height: 2px;
  width: 0%;
  background: linear-gradient(90deg, var(--color-gold), var(--color-gold-bright) 50%, var(--color-electric-blue));
  pointer-events: none;
  z-index: 2;
}

.site-footer {
  position: relative;
  background: var(--color-carbon);
  color: var(--color-muted-gray);
  font-size: 14px;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  height: 2px;
  width: 28%;
  background: linear-gradient(90deg, var(--color-gold), var(--color-gold-bright));
}

.site-footer__inner {
  max-width: 1280px;
  margin-inline: auto;
  padding: var(--footer-top-space) 24px 48px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 48px;
}

.site-footer__brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
}

.site-footer__mark {
  display: inline-block;
  width: 36px;
  height: 36px;
  background: var(--color-gold);
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 0 100%);
  position: relative;
}

.site-footer__mark::after {
  content: "";
  position: absolute;
  top: 13px;
  left: -4px;
  width: calc(100% + 8px);
  height: 3px;
  background: var(--color-tech-blue);
  transform: rotate(-18deg);
}

.site-footer__brand-text {
  font-size: 22px;
  font-weight: 900;
  letter-spacing: 0.08em;
  color: var(--color-off-white);
  line-height: 1;
}

.site-footer__tagline {
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-muted-gray);
  max-width: 32ch;
}

.site-footer__col,
.site-footer__contact {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.site-footer__title {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-off-white);
  margin: 0;
}

.site-footer__list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.site-footer__list a {
  color: var(--color-muted-gray);
  text-decoration: none;
  position: relative;
  padding-bottom: 2px;
  transition: color 0.2s ease;
}

.site-footer__list a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--color-gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.2s ease;
}

.site-footer__list a:hover {
  color: var(--color-gold);
}

.site-footer__list a:hover::after {
  transform: scaleX(1);
}

.site-footer__contact-item {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.8;
  color: var(--color-muted-gray);
}

.site-footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.site-footer__bottom-inner {
  max-width: 1280px;
  margin-inline: auto;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 13px;
  color: var(--color-muted-gray);
}

.site-footer__copyright {
  white-space: nowrap;
}

.site-footer__divider {
  display: inline-block;
  width: 1px;
  height: 12px;
  background: rgba(255, 255, 255, 0.18);
}

.site-footer__icp {
  white-space: nowrap;
}

.back-top {
  position: fixed;
  right: 28px;
  bottom: 28px;
  z-index: 999;
  width: 44px;
  height: 44px;
  background: var(--color-carbon);
  border: 1px solid var(--color-gold);
  color: var(--color-gold);
  font-size: 18px;
  line-height: 1;
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 0 100%);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 0.2s ease, visibility 0.2s ease, transform 0.2s ease, background-color 0.2s ease;
}

.back-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-top:hover {
  background: var(--color-gold);
  color: var(--color-obsidian);
}

.back-top__icon {
  display: block;
  line-height: 1;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-gold);
}

.section-label::before {
  content: "";
  display: block;
  width: 28px;
  height: 1px;
  background: var(--color-gold);
}

.img-frame {
  position: relative;
  overflow: hidden;
  background: var(--color-carbon);
  border: 1px solid rgba(255, 255, 255, 0.08);
  aspect-ratio: 16 / 9;
}

.img-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 60%, rgba(212, 168, 67, 0.12) 100%);
  pointer-events: none;
}

.img-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.data-line {
  display: block;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-gold) 25%, var(--color-tech-blue) 65%, transparent);
}

.prose {
  max-width: 72ch;
  color: var(--color-muted-gray);
  line-height: 1.9;
}

.prose p {
  margin-bottom: 1.2em;
}

@media (max-width: 1023.98px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 50;
    background: var(--color-carbon);
    border-top: 1px solid rgba(212, 168, 67, 0.25);
    border-bottom: 1px solid rgba(212, 168, 67, 0.25);
    max-height: calc(100vh - var(--header-height));
    overflow-y: auto;
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease;
    margin-left: 0;
  }

  .site-nav[data-open] {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .site-nav__list {
    display: grid;
    gap: 0;
    padding: 8px 24px 16px;
  }

  .site-nav__item {
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }

  .site-nav__item:last-child {
    border-bottom: none;
  }

  .site-nav__link {
    display: block;
    padding: 14px 8px;
    font-size: 16px;
  }

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

  .site-nav__link:hover {
    background: var(--color-graphite);
    color: var(--color-off-white);
  }

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

  .site-header__inner {
    gap: 14px;
  }
}

@media (max-width: 640px) {
  .status-badge {
    display: none;
  }

  .btn--gold {
    padding: 10px 14px;
    font-size: 13px;
  }

  .site-brand__text {
    font-size: 17px;
  }

  .site-footer__inner {
    grid-template-columns: 1fr;
    gap: 28px;
    padding-top: 48px;
    padding-bottom: 32px;
  }

  .site-footer__bottom-inner {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }

  .site-footer__divider {
    display: none;
  }

  .back-top {
    right: 16px;
    bottom: 16px;
  }
}

@media (min-width: 1024px) {
  body[data-nav-open] {
    overflow: auto;
  }
}

@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;
  }
}