:root {
  --c-primary: #0B1D3A;
  --c-accent: #00FF87;
  --c-orange: #FF6A00;
  --c-purple: #9D4EDD;
  --c-bg-light: #F4F7FB;
  --c-text-on-dark: #FFFFFF;
  --c-text-on-light: #1A1A1A;
  --c-text-secondary: #8FA3BF;
  --c-border-green: rgba(0, 255, 135, 0.27);
  --c-overlay-dark: rgba(0, 0, 0, 0.2);
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: "SF Mono", "Cascadia Code", "Roboto Mono", "Consolas", monospace;
  --container-max: 1240px;
  --container-pad: 24px;
  --transition-base: 0.3s ease;
  --transition-fast: 0.2s ease;
  --radius-sm: 4px;
  --radius-md: 8px;
}

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

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

body {
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--c-text-on-light);
  background: var(--c-bg-light);
  -webkit-font-smoothing: antialiased;
}

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

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

button {
  font: inherit;
  border: 0;
  background: none;
  cursor: pointer;
}

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 900;
  line-height: 1.15;
  color: var(--c-primary);
}

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

.grid-2, .grid-3 {
  display: grid;
  gap: 28px;
}

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

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

.section-pad {
  padding-block: 72px;
}

.section-pad-sm {
  padding-block: 40px;
}

.section-dark {
  background: var(--c-primary);
  color: var(--c-text-on-dark);
}

.section-dark h1,
.section-dark h2,
.section-dark h3,
.section-dark h4 {
  color: var(--c-text-on-dark);
}

.section-dark a {
  color: var(--c-accent);
}

.section-dark a:hover {
  color: var(--c-text-on-dark);
}

.section-light {
  background: var(--c-bg-light);
  color: var(--c-text-on-light);
}

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

.skip-link {
  position: fixed;
  top: -100px;
  left: 16px;
  z-index: 10000;
  background: var(--c-accent);
  color: var(--c-primary);
  font-weight: 900;
  font-size: 14px;
  padding: 12px 24px;
  clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0;
}

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

#main-content {
  scroll-margin-top: 130px;
  outline: none;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  z-index: 5000;
  pointer-events: none;
  background: rgba(0, 255, 135, 0.12);
}

.scroll-progress__bar {
  display: block;
  width: 0%;
  height: 100%;
  background: var(--c-accent);
  transition: width 0.08s linear;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--c-primary);
  color: var(--c-text-on-dark);
}

.site-header__top {
  background: var(--c-primary);
  border-bottom: 1px solid var(--c-border-green);
}

.site-header__top-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 56px;
  gap: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--c-text-on-dark);
  text-decoration: none;
}

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

.brand__logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  background: var(--c-accent);
  color: var(--c-primary);
  font-family: var(--font-mono);
  font-weight: 900;
  font-size: 14px;
  line-height: 1;
  clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}

.brand__name {
  font-weight: 900;
  font-size: 19px;
  letter-spacing: 0.04em;
  color: inherit;
  line-height: 1.2;
}

.site-header__note {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-text-secondary);
  letter-spacing: 0.04em;
  margin: 0;
}

.site-header__note-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-accent);
  box-shadow: 0 0 8px rgba(0, 255, 135, 0.5);
  animation: pulse 2s ease-in-out infinite;
}

.site-header__nav {
  background: var(--c-primary);
  position: relative;
  border-bottom: 3px solid var(--c-accent);
}

.site-header__nav::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -3px;
  width: 80px;
  height: 3px;
  background: var(--c-orange);
  clip-path: polygon(0 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
  z-index: 1;
}

.site-header__nav-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 62px;
  position: relative;
}

.site-nav {
  flex: 1;
}

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

.site-nav__link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 18px 14px 16px;
  color: rgba(255, 255, 255, 0.84);
  font-weight: 700;
  font-size: 15px;
  position: relative;
  transition: color var(--transition-fast);
}

.site-nav__link::after {
  content: '';
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: -3px;
  height: 3px;
  background: var(--c-accent);
  clip-path: polygon(0 0, 100% 0, calc(100% - 6px) 100%, 0 100%);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

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

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

.site-nav__index {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--c-text-secondary);
  transition: color var(--transition-fast);
}

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

.site-nav__text {
  font-weight: 700;
}

.site-header__status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--c-text-secondary);
  border: 1px solid var(--c-border-green);
  padding: 6px 14px;
  clip-path: polygon(6px 0, 100% 0, calc(100% - 6px) 100%, 0 100%);
}

.site-header__status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-orange);
  animation: pulse 2s ease-in-out infinite;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  background: transparent;
  border: 1px solid var(--c-border-green);
  padding: 8px 14px;
  color: var(--c-text-on-dark);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  line-height: 1;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.nav-toggle:hover {
  border-color: var(--c-accent);
  background: rgba(0, 255, 135, 0.08);
}

.nav-toggle__bars {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 18px;
}

.nav-toggle__bar {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--c-accent);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.nav-toggle__text {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.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-footer {
  position: relative;
  background: var(--c-primary);
  color: var(--c-text-secondary);
  margin-top: 96px;
}

.site-footer__decor {
  height: 8px;
  background: repeating-linear-gradient(135deg, var(--c-accent) 0 16px, transparent 16px 32px);
  opacity: 0.5;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.4fr;
  gap: 40px;
  padding-top: 56px;
  padding-bottom: 48px;
}

.site-footer .brand {
  color: var(--c-text-on-dark);
}

.site-footer .brand:hover {
  color: var(--c-accent);
}

.site-footer__slogan {
  color: var(--c-accent);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  margin: 14px 0 12px;
}

.site-footer__trust {
  max-width: 340px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-text-secondary);
}

.site-footer__heading {
  color: var(--c-text-on-dark);
  font-size: 14px;
  font-weight: 900;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
  padding-bottom: 8px;
  position: relative;
}

.site-footer__heading::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 32px;
  height: 2px;
  background: var(--c-accent);
}

.site-footer__links li {
  margin-bottom: 10px;
}

.site-footer__links a {
  color: var(--c-text-secondary);
  font-size: 14px;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.site-footer__links a:hover {
  color: var(--c-accent);
  padding-left: 4px;
}

.site-footer__contact-line {
  font-size: 14px;
  margin-bottom: 10px;
  line-height: 1.5;
}

.site-footer__contact-note {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--c-text-secondary);
  opacity: 0.8;
  margin-top: 12px;
  line-height: 1.6;
}

.site-footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(0, 0, 0, 0.22);
}

.site-footer__bottom-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 56px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-text-secondary);
}

.site-footer__copyright,
.site-footer__icp {
  margin: 0;
  line-height: 1.4;
}

.back-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 46px;
  height: 46px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--c-primary);
  border: 2px solid var(--c-accent);
  color: var(--c-accent);
  font-size: 20px;
  cursor: pointer;
  clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity var(--transition-base), visibility var(--transition-base), transform var(--transition-base), background var(--transition-fast), color var(--transition-fast);
  z-index: 900;
}

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

.back-top:hover {
  background: var(--c-accent);
  color: var(--c-primary);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 900;
  letter-spacing: 0.04em;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  background: transparent;
  border: 0;
  clip-path: polygon(12px 0, 100% 0, calc(100% - 12px) 100%, 0 100%);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast), color var(--transition-fast);
}

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

.btn--primary:hover {
  transform: translateX(3px);
  box-shadow: 4px 4px 0 rgba(0, 255, 135, 0.35);
  color: var(--c-primary);
}

.btn--ghost {
  background: transparent;
  color: var(--c-accent);
  border: 2px solid var(--c-accent);
}

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

.btn--sm {
  padding: 8px 18px;
  font-size: 12px;
}

.breadcrumbs {
  font-family: var(--font-mono);
  font-size: 13px;
  margin: 20px 0;
  color: var(--c-text-secondary);
}

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

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

.breadcrumbs__item:not(:last-child)::after {
  content: '/';
  margin: 0 8px;
  color: var(--c-accent);
  font-weight: 900;
}

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

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

.breadcrumbs__item[aria-current="page"] {
  color: var(--c-primary);
  font-weight: 700;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-primary);
  margin-bottom: 12px;
}

.section-label::before {
  content: '';
  width: 28px;
  height: 2px;
  background: var(--c-accent);
  display: inline-block;
}

.page-title {
  font-size: clamp(30px, 5vw, 46px);
  font-weight: 900;
  line-height: 1.08;
  color: var(--c-primary);
  letter-spacing: -0.01em;
  margin-bottom: 16px;
}

.lead {
  font-size: 17px;
  line-height: 1.75;
  color: var(--c-text-secondary);
  max-width: 62ch;
  margin-bottom: 28px;
}

.prose {
  font-size: 16px;
  line-height: 1.8;
  color: var(--c-text-on-light);
  max-width: 72ch;
}

.prose p {
  margin-bottom: 1em;
}

.prose h2 {
  font-size: 24px;
  color: var(--c-primary);
  margin: 2em 0 0.7em;
  padding-left: 14px;
  border-left: 4px solid var(--c-accent);
}

.prose h3 {
  font-size: 19px;
  color: var(--c-primary);
  margin: 1.6em 0 0.6em;
}

.prose ul,
.prose ol {
  margin: 1em 0;
  padding-left: 1.4em;
}

.prose ul {
  list-style: disc;
}

.prose ol {
  list-style: decimal;
}

.prose li {
  margin-bottom: 0.4em;
}

.prose a {
  color: var(--c-primary);
  font-weight: 700;
  text-decoration: underline;
  text-decoration-color: var(--c-accent);
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

.prose a:hover {
  color: var(--c-orange);
}

.prose blockquote {
  margin: 1.5em 0;
  padding: 16px 20px;
  border-left: 4px solid var(--c-purple);
  background: #fff;
  color: var(--c-text-secondary);
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--c-primary);
  color: var(--c-accent);
  padding: 2px 6px;
}

.txt-accent {
  font-style: italic;
  font-weight: 900;
  color: var(--c-accent);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  line-height: 1;
  padding: 5px 10px;
  text-transform: uppercase;
  color: #fff;
  clip-path: polygon(4px 0, 100% 0, calc(100% - 4px) 100%, 0 100%);
}

.badge--hot {
  background: var(--c-orange);
}

.badge--new {
  background: var(--c-accent);
  color: var(--c-primary);
}

.badge--tag {
  background: var(--c-purple);
}

.stat-chip {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 400;
  color: var(--c-text-secondary);
  background: #fff;
  border: 1px solid var(--c-border-green);
  padding: 8px 16px;
  line-height: 1;
}

.stat-chip strong {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--c-primary);
}

.stat-chip .stat-chip__delta {
  color: var(--c-orange);
  font-size: 12px;
  font-weight: 700;
}

.img-frame {
  position: relative;
  display: block;
  overflow: hidden;
  background: var(--c-primary);
  clip-path: polygon(16px 0, 100% 0, calc(100% - 16px) 100%, 0 100%);
}

.img-frame::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(135deg, var(--c-overlay-dark), transparent 70%);
  pointer-events: none;
}

.img-frame--3-2 {
  aspect-ratio: 3 / 2;
}

.img-frame--16-9 {
  aspect-ratio: 16 / 9;
}

.img-frame--4-3 {
  aspect-ratio: 4 / 3;
}

.img-frame > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.6s ease;
}

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

[data-reveal] {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.6s ease-out var(--reveal-delay, 0s), transform 0.6s ease-out var(--reveal-delay, 0s);
}

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

@keyframes pulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.4;
    transform: scale(0.8);
  }
}

@media (max-width: 900px) {
  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex: none;
    background: var(--c-primary);
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.35);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transition: max-height 0.4s ease, opacity 0.3s ease, visibility 0.4s;
  }

  .site-nav[data-open] {
    max-height: 520px;
    opacity: 1;
    visibility: visible;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    padding: 8px 24px 16px;
    gap: 0;
  }

  .site-nav__link {
    display: flex;
    align-items: center;
    padding: 14px 12px;
    border-left: 3px solid transparent;
  }

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

  .site-nav__link:hover,
  .site-nav__link[aria-current="page"] {
    color: var(--c-accent);
    background: rgba(0, 255, 135, 0.06);
    border-left-color: var(--c-accent);
  }

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

  .site-header__status {
    display: none;
  }

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

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

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

@media (max-width: 640px) {
  :root {
    --container-pad: 16px;
  }

  .site-header__note {
    font-size: 11px;
  }

  .brand__name {
    font-size: 17px;
  }

  .brand__logo {
    width: 34px;
    height: 34px;
    font-size: 12px;
  }

  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: 32px 0;
    padding-top: 40px;
    padding-bottom: 36px;
  }

  .site-footer__bottom-inner {
    flex-direction: column;
    align-items: flex-start;
    padding-top: 14px;
    padding-bottom: 14px;
    gap: 4px;
  }

  .back-top {
    right: 16px;
    bottom: 16px;
    width: 42px;
    height: 42px;
  }

  .section-pad {
    padding-block: 48px;
  }

  .section-pad-sm {
    padding-block: 32px;
  }
}

@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;
  }

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

  .site-nav[data-open] {
    max-height: none;
    transition: none;
  }
}