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

:root {
  --space-blue: #0B1B3A;
  --space-blue-light: #142A54;
  --electric-orange: #FF6B2B;
  --electric-orange-light: #FF8552;
  --electric-green: #00E18B;
  --wine-red: #8B2B45;
  --wine-red-dark: #6E1F35;
  --indigo-purple: #4B2B8B;
  --glass-panel: rgba(255, 255, 255, 0.08);
  --text-primary: #F5F7FA;
  --text-secondary: #B0B8CC;
  --divider-line: #2E3A5C;
  --gold-accent: #E5C37E;
  --container-width: 1200px;
  --header-z: 200;
  --progress-z: 400;
  --backtop-z: 150;
  --radius: 8px;
  --transition-fast: 0.2s ease;
  --transition-medium: 0.35s ease;
  --font-heading: 'Noto Sans SC', 'Microsoft YaHei', 'PingFang SC', sans-serif;
  --font-body: 'Inter', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background-color: var(--space-blue);
  color: var(--text-primary);
  font-size: 1rem;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--text-primary);
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1rem; }

a {
  color: var(--electric-orange);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--electric-orange-light);
}

ul, ol {
  list-style: none;
}

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

:focus-visible {
  outline: 3px solid var(--electric-orange);
  outline-offset: 3px;
  border-radius: 2px;
}

#main-content:focus {
  outline: none;
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: 24px;
}

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

.skip-link {
  position: fixed;
  top: -72px;
  left: 16px;
  z-index: 999;
  padding: 12px 20px;
  background: var(--electric-orange);
  color: #fff;
  border-radius: 4px;
  font-weight: 700;
  font-size: 0.875rem;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 12px;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  z-index: var(--progress-z);
  pointer-events: none;
}

.scroll-progress::before {
  content: '';
  display: block;
  height: 100%;
  width: var(--progress, 0%);
  background: linear-gradient(90deg, var(--electric-green), var(--electric-orange));
  box-shadow: 0 0 10px rgba(0, 225, 139, 0.5);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--header-z);
  background: linear-gradient(180deg, var(--space-blue) 0%, rgba(11, 27, 58, 0.95) 100%);
  border-bottom: 1px solid var(--divider-line);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.site-header__inner {
  position: relative;
}

.site-header__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px 0;
}

.site-header__brand {
  display: inline-flex;
  align-items: baseline;
  gap: 16px;
  flex-shrink: 0;
}

.site-header__logo {
  font-family: var(--font-heading);
  font-size: 1.625rem;
  font-weight: 900;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.site-header__logo::before {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--electric-orange);
  border-radius: 2px;
  transform: skewX(-12deg);
  margin-right: 8px;
}

.site-header__slogan {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  white-space: nowrap;
}

.site-header__quick {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex: 1;
  min-width: 0;
}

.site-header__shortcut {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: transparent;
  border: 1px solid var(--divider-line);
  border-radius: 4px;
  color: var(--text-primary);
  cursor: pointer;
  transition: border-color var(--transition-fast);
}

.nav-toggle:hover {
  border-color: var(--electric-orange);
}

.nav-toggle__box {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 20px;
}

.nav-toggle__line {
  display: block;
  height: 2px;
  background: var(--electric-orange);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.nav-toggle__text {
  font-size: 0.75rem;
}

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

.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-top: 1px solid rgba(46, 58, 92, 0.5);
}

.site-nav__list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
}

.site-nav__item {
  position: relative;
}

.site-nav__link {
  display: block;
  padding: 14px 20px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9375rem;
  color: var(--text-primary);
  letter-spacing: 0.01em;
  position: relative;
}

.site-nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 20px;
  right: 20px;
  height: 3px;
  background: var(--electric-orange);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-medium);
}

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

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

.site-nav__cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  background: var(--electric-orange);
  color: #fff;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.8125rem;
  flex-shrink: 0;
  transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.site-nav__cta::before {
  content: '';
  width: 6px;
  height: 6px;
  background: #fff;
  border-radius: 50%;
}

.site-nav__cta:hover {
  background: var(--electric-orange-light);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(255, 107, 43, 0.4);
}

.page-main {
  min-height: 55vh;
}

.page-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  padding: 48px 0 24px;
}

.section {
  padding-block: 64px;
}

.section-title {
  margin-bottom: 16px;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 14px;
  background: rgba(255, 107, 43, 0.1);
  border-left: 3px solid var(--electric-orange);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--electric-orange);
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 4px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9375rem;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  min-height: 44px;
  transition: background var(--transition-fast), border-color var(--transition-fast),
              color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn--primary {
  background: var(--electric-orange);
  color: #fff;
}

.btn--primary:hover {
  background: var(--electric-orange-light);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255, 107, 43, 0.3);
}

.btn--ghost {
  background: transparent;
  border-color: var(--divider-line);
  color: var(--text-primary);
}

.btn--ghost:hover {
  border-color: var(--electric-orange);
  color: var(--electric-orange);
}

.panel {
  background: var(--glass-panel);
  border: 1px solid rgba(46, 58, 92, 0.6);
  border-radius: var(--radius);
  padding: 32px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.panel--tilt {
  transform: rotate(5deg);
}

.panel--tilt-alt {
  transform: rotate(-5deg);
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 20px 0 0;
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.breadcrumbs__link {
  color: var(--text-secondary);
}

.breadcrumbs__link:hover {
  color: var(--electric-orange);
}

.breadcrumbs__separator {
  color: var(--divider-line);
  margin-inline: 2px;
}

.breadcrumbs__current {
  color: var(--text-primary);
  font-weight: 700;
}

.frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(46, 58, 92, 0.6), rgba(11, 27, 58, 0.2));
}

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

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.js-enabled [data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.js-enabled [data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

.site-footer {
  position: relative;
  background: linear-gradient(150deg, var(--wine-red-dark) 0%, var(--wine-red) 60%, #9A3150 100%);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  margin-top: 80px;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--electric-orange), var(--gold-accent), var(--electric-green));
}

.site-footer__inner {
  padding-top: 56px;
  padding-bottom: 32px;
}

.site-footer__top {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr 0.8fr 1.2fr;
  gap: 48px;
  margin-bottom: 48px;
}

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

.site-footer__logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--text-primary);
}

.site-footer__logo::before {
  content: '◆\00a0';
  color: var(--electric-orange);
}

.site-footer__desc {
  margin-top: 12px;
  font-size: 0.875rem;
  color: rgba(245, 247, 250, 0.75);
  line-height: 1.6;
  max-width: 300px;
}

.site-footer__col {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
}

.site-footer__title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--gold-accent);
  margin-bottom: 8px;
}

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

.site-footer__link {
  display: inline-block;
  padding: 4px 0;
  color: rgba(245, 247, 250, 0.85);
  font-size: 0.9375rem;
}

.site-footer__link:hover {
  color: var(--electric-green);
}

.site-footer__contact {
  padding: 4px 0;
  font-size: 0.875rem;
  color: rgba(245, 247, 250, 0.85);
  line-height: 1.6;
}

.site-footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 0.8125rem;
  color: rgba(245, 247, 250, 0.7);
}

.site-footer__copyright,
.site-footer__icp {
  color: rgba(245, 247, 250, 0.7);
}

.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 32px;
  z-index: var(--backtop-z);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  background: rgba(11, 27, 58, 0.92);
  border: 1px solid var(--divider-line);
  border-radius: 999px;
  color: var(--text-primary);
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 700;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: opacity var(--transition-medium), transform var(--transition-medium), visibility var(--transition-medium);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

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

.back-to-top:hover {
  border-color: var(--electric-orange);
  color: var(--electric-orange);
}

.back-to-top__icon {
  font-family: var(--font-mono);
  font-size: 1rem;
  line-height: 1;
}

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

  .site-footer__top {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .site-footer__brand {
    grid-column: 1 / -1;
  }

  .site-footer__desc {
    max-width: 100%;
  }
}

@media (max-width: 767px) {
  .container {
    padding-inline: 16px;
  }

  .site-header__top {
    padding: 12px 0;
  }

  .site-header__brand {
    flex-direction: column;
    gap: 2px;
    align-items: flex-start;
  }

  .site-header__logo {
    font-size: 1.375rem;
  }

  .site-header__slogan {
    font-size: 0.75rem;
  }

  .site-header__quick {
    flex: 0;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: -16px;
    right: -16px;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 0 24px;
    background: rgba(11, 27, 58, 0.98);
    border-top: 1px solid var(--divider-line);
    border-bottom: 1px solid var(--divider-line);
    box-shadow: 0 24px 40px rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
  }

  .site-nav[data-open] {
    display: flex;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
  }

  .site-nav__item {
    border-bottom: 1px solid rgba(46, 58, 92, 0.4);
  }

  .site-nav__link {
    padding: 14px 24px;
    font-size: 1rem;
  }

  .site-nav__link::after {
    left: 24px;
    right: auto;
    width: 0;
    transition: width var(--transition-medium);
  }

  .site-nav__link:hover::after,
  .site-nav__link[aria-current="page"]::after {
    width: 32px;
    transform: none;
  }

  .site-nav__cta {
    margin: 16px 24px 0;
    justify-content: center;
  }

  .section {
    padding-block: 40px;
  }

  .split {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .panel {
    padding: 20px;
  }

  .panel--tilt,
  .panel--tilt-alt {
    transform: none;
  }

  .site-footer {
    margin-top: 48px;
  }

  .site-footer__inner {
    padding-top: 40px;
  }

  .site-footer__top {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .site-footer__bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .back-to-top {
    right: 16px;
    bottom: 16px;
    padding: 8px 14px;
  }
}

@media (max-width: 480px) {
  .site-header__slogan {
    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;
  }

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

  .panel--tilt,
  .panel--tilt-alt {
    transform: none;
  }
}