:root {
  --color-primary: #FF4E00;
  --color-primary-dark: #D94300;
  --color-bg: #0A0E1A;
  --color-bg-lighter: #10182B;
  --color-bg-card: #151F35;
  --color-accent-green: #39FF14;
  --color-accent-gold: #FFD700;
  --color-teal: #004D40;
  --color-wine: #800020;
  --color-text-warm: #F2F2F2;
  --color-text-muted: #B0B0B0;
  --color-border: rgba(255, 255, 255, 0.1);
  --color-border-green: rgba(57, 255, 20, 0.18);
  --color-primary-soft: rgba(255, 78, 0, 0.12);
  --font-heading: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", "Helvetica Neue", Arial, sans-serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Consolas", "Roboto Mono", "Menlo", monospace;
  --header-width: 280px;
  --header-width-tablet: 240px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 4px 20px rgba(255, 78, 0, 0.35);
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text-warm);
  background-color: var(--color-bg);
  background-image:
    linear-gradient(rgba(57, 255, 20, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(57, 255, 20, 0.025) 1px, transparent 1px);
  background-size: 24px 24px;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

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

ul, ol {
  list-style: none;
}

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

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

input, textarea, select {
  font: inherit;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 900;
  line-height: 1.25;
  color: var(--color-text-warm);
}

.skip-link {
  position: fixed;
  top: -200px;
  left: 16px;
  z-index: 10000;
  background: var(--color-primary);
  color: var(--color-bg);
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 14px;
  padding: 14px 28px;
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
  transition: top var(--transition-fast);
}

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

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent-green) 100%);
  z-index: 9999;
  pointer-events: none;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--header-width);
  height: 100vh;
  background: var(--color-bg);
  border-right: 1px solid var(--color-border-green);
  display: flex;
  flex-direction: column;
  padding: 32px 24px 24px;
  z-index: 1000;
  overflow-y: auto;
}

.site-header::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(57, 255, 20, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(57, 255, 20, 0.03) 1px, transparent 1px);
  background-size: 20px 20px;
  pointer-events: none;
}

.site-header__bar,
.site-nav,
.to-top {
  position: relative;
  z-index: 1;
}

.site-header__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 40px;
  flex-shrink: 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-bg);
  font-family: var(--font-heading);
  font-size: 28px;
  font-weight: 900;
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
  flex-shrink: 0;
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand__name {
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 900;
  color: var(--color-text-warm);
  letter-spacing: 0.02em;
}

.brand__name::after {
  content: '';
  display: inline-block;
  width: 7px;
  height: 7px;
  background: var(--color-accent-gold);
  margin-left: 6px;
  transform: rotate(45deg);
  border-radius: 1px;
}

.brand__sub {
  font-size: 11px;
  color: var(--color-accent-green);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-top: 2px;
}

.nav-toggle {
  display: none;
}

.site-nav {
  display: flex;
  flex-direction: column;
  flex: 1;
}

.site-nav__close {
  display: none;
}

.site-nav__list {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.site-nav__item {
  position: relative;
}

.site-nav__link {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 16px;
  min-height: 44px;
  color: var(--color-text-muted);
  font-weight: 500;
  font-size: 15px;
  border-left: 2px solid transparent;
  transition: background var(--transition-fast), color var(--transition-fast), border-left-color var(--transition-fast);
}

.site-nav__link:hover {
  color: var(--color-text-warm);
  background: var(--color-primary-soft);
  border-left-color: var(--color-primary);
}

.site-nav__link[aria-current="page"] {
  color: var(--color-accent-green);
  border-left-color: var(--color-accent-green);
  background: rgba(57, 255, 20, 0.06);
}

.site-nav__index {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-accent-green);
  opacity: 0.5;
  min-width: 20px;
}

.site-nav__link[aria-current="page"] .site-nav__index {
  opacity: 1;
}

.site-nav__label {
  display: block;
  line-height: 1.3;
}

.site-nav__cta {
  display: block;
  margin-top: 28px;
  padding: 14px 20px;
  background: var(--color-primary);
  color: var(--color-bg);
  font-weight: 700;
  font-size: 15px;
  text-align: center;
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

.site-nav__cta:hover {
  transform: translateY(-2px);
  background: #FF5E1F;
  box-shadow: var(--shadow-glow);
}

.to-top {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--color-border-green);
  background: rgba(57, 255, 20, 0.05);
  color: var(--color-accent-green);
  margin-top: 20px;
  font-size: 20px;
  line-height: 1;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.to-top:hover {
  background: rgba(57, 255, 20, 0.12);
  border-color: var(--color-accent-green);
}

.site-footer {
  margin-left: var(--header-width);
  padding: 64px 48px 24px;
  background: var(--color-bg);
  border-top: 1px solid var(--color-border-green);
  position: relative;
}

.site-footer::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(57, 255, 20, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(57, 255, 20, 0.02) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}

.site-footer__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.6fr 1fr 1.4fr;
  gap: 48px;
  max-width: 1280px;
  margin: 0 auto;
}

.brand--footer .brand__mark {
  width: 40px;
  height: 40px;
  font-size: 22px;
}

.site-footer__about {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-top: 14px;
}

.site-footer__title {
  display: inline-block;
  font-size: 14px;
  font-weight: 700;
  color: var(--color-text-warm);
  letter-spacing: 0.08em;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border-green);
}

.site-footer__title::before {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--color-accent-green);
  margin-right: 8px;
  border-radius: 1px;
}

.site-footer__list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px 16px;
}

.site-footer__link {
  display: inline-block;
  padding: 4px 0;
  font-size: 14px;
  color: var(--color-text-muted);
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.site-footer__link:hover {
  color: var(--color-accent-green);
  padding-left: 6px;
}

.site-footer__contact {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.8;
}

.site-footer__contact p + p {
  margin-top: 4px;
}

.site-footer__note {
  margin-top: 12px !important;
  font-size: 13px;
  opacity: 0.8;
}

.site-footer__bottom {
  position: relative;
  z-index: 1;
  max-width: 1280px;
  margin: 48px auto 0;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 16px;
  font-size: 13px;
  color: var(--color-text-muted);
}

.site-footer__icp {
  color: var(--color-text-muted);
}

#main-content {
  display: block;
  margin-left: var(--header-width);
  min-height: 60vh;
}

.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 32px;
}

.btn {
  display: inline-block;
  padding: 12px 28px;
  font-weight: 700;
  font-size: 15px;
  line-height: 1.4;
  background: var(--color-primary);
  color: var(--color-bg);
  text-align: center;
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
  background: #FF5E1F;
}

.btn:active {
  transform: translateY(0);
}

.btn--outline {
  background: transparent;
  color: var(--color-text-warm);
  border: 1px solid var(--color-primary);
}

.btn--outline:hover {
  background: var(--color-primary-soft);
  box-shadow: none;
}

.btn--ghost-green {
  background: transparent;
  color: var(--color-accent-green);
  border: 1px solid var(--color-accent-green);
}

.btn--ghost-green:hover {
  background: rgba(57, 255, 20, 0.08);
  box-shadow: 0 4px 20px rgba(57, 255, 20, 0.2);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--color-text-muted);
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

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

.breadcrumb__item + .breadcrumb__item::before {
  content: '/';
  color: var(--color-primary);
  font-weight: 700;
}

.breadcrumb__link {
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.breadcrumb__link:hover {
  color: var(--color-accent-green);
}

.breadcrumb__current {
  color: var(--color-text-warm);
  font-weight: 600;
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 24px;
}

.grid--2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.grid--3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.grid--4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.prose {
  max-width: 760px;
  line-height: 1.8;
  color: var(--color-text-warm);
  font-size: 15px;
}

.prose p + p {
  margin-top: 1.2em;
}

.prose h2 {
  font-size: 32px;
  margin: 1.8em 0 0.8em;
  padding-left: 20px;
  position: relative;
}

.prose h2::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.1em;
  bottom: 0.1em;
  width: 4px;
  background: linear-gradient(to bottom, var(--color-primary), var(--color-accent-green));
}

.prose h3 {
  font-size: 22px;
  margin: 1.5em 0 0.6em;
  color: var(--color-text-warm);
}

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

.prose ul {
  list-style: disc;
}

.prose ol {
  list-style: decimal;
}

.prose li + li {
  margin-top: 0.4em;
}

.prose a {
  color: var(--color-primary);
  font-weight: 600;
}

.prose a:hover {
  color: var(--color-accent-green);
}

.media-frame {
  position: relative;
  overflow: hidden;
  background: var(--color-bg-lighter);
  aspect-ratio: 16 / 9;
  border: 1px solid var(--color-border-green);
}

.media-frame::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 55%, rgba(255, 78, 0, 0.12));
  pointer-events: none;
  z-index: 1;
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.45s ease;
}

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

.media-frame--hero {
  aspect-ratio: 21 / 9;
}

.media-frame--wide {
  aspect-ratio: 2 / 1;
}

.media-frame--square {
  aspect-ratio: 1 / 1;
}

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

.has-blueprint-bg {
  position: relative;
}

.has-blueprint-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(57, 255, 20, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(57, 255, 20, 0.04) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
  z-index: 0;
}

.has-blueprint-bg > * {
  position: relative;
  z-index: 1;
}

.coord-index {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--color-accent-green);
  border: 1px solid var(--color-border-green);
  background: rgba(57, 255, 20, 0.04);
  letter-spacing: 0.04em;
}

.coord-index::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--color-accent-green);
  display: inline-block;
  flex-shrink: 0;
}

.corner-mark {
  position: relative;
}

.corner-mark::before,
.corner-mark::after {
  content: '';
  position: absolute;
  width: 18px;
  height: 18px;
  border-color: rgba(255, 78, 0, 0.6);
  border-style: solid;
  z-index: 2;
  pointer-events: none;
}

.corner-mark::before {
  top: 0;
  left: 0;
  border-width: 2px 0 0 2px;
}

.corner-mark::after {
  bottom: 0;
  right: 0;
  border-width: 0 2px 2px 0;
}

.js .reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.reveal {
  will-change: opacity, transform;
}

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

a:focus-visible,
button:focus-visible {
  border-radius: 2px;
}

@media (max-width: 1023px) {
  .grid--3,
  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 768px) and (max-width: 1023px) {
  :root {
    --header-width: var(--header-width-tablet);
  }

  .site-header {
    padding: 24px 20px 20px;
  }

  .site-header__bar {
    margin-bottom: 28px;
  }

  .site-nav__link {
    padding: 10px 12px;
    font-size: 14px;
  }

  .site-nav__index {
    min-width: 16px;
  }

  .site-nav__cta {
    padding: 12px 16px;
    font-size: 14px;
  }

  .site-footer__grid {
    grid-template-columns: 1.4fr 1fr 1.2fr;
    gap: 32px;
  }
}

@media (max-width: 767px) {
  .site-header {
    width: 100%;
    height: 64px;
    min-height: 64px;
    padding: 0 20px;
    border-right: none;
    border-bottom: 1px solid var(--color-border-green);
    flex-direction: row;
    align-items: center;
    overflow: visible;
  }

  .site-header__bar {
    margin-bottom: 0;
    flex: 1;
  }

  .brand__mark {
    width: 40px;
    height: 40px;
    font-size: 22px;
  }

  .brand__name {
    font-size: 18px;
  }

  .brand__sub {
    font-size: 10px;
  }

  .nav-toggle {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    border: 1px solid var(--color-border-green);
    background: rgba(57, 255, 20, 0.05);
    color: var(--color-text-warm);
    font-size: 12px;
    min-height: 44px;
  }

  .nav-toggle__bar {
    display: block;
    width: 18px;
    height: 2px;
    background: var(--color-text-warm);
    margin: 2px auto;
    transition: transform var(--transition-fast), opacity var(--transition-fast);
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
    transform: translateY(5px) 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(-5px) rotate(-45deg);
  }

  .nav-toggle__label {
    font-size: 12px;
    line-height: 1;
  }

  .site-nav {
    position: fixed;
    top: 64px;
    bottom: 0;
    left: 0;
    width: min(320px, 85vw);
    height: auto;
    background: var(--color-bg-lighter);
    border-right: 1px solid var(--color-border-green);
    z-index: 1500;
    padding: 80px 24px 32px;
    overflow-y: auto;
    transform: translateX(-100%);
    transition: transform var(--transition-base);
  }

  .site-nav[data-open] {
    transform: translateX(0);
  }

  .site-nav__close {
    display: grid;
    place-items: center;
    position: absolute;
    top: 16px;
    right: 16px;
    width: 40px;
    height: 40px;
    border: 1px solid var(--color-border);
    background: rgba(255, 255, 255, 0.04);
    color: var(--color-text-warm);
    font-size: 24px;
    line-height: 1;
    z-index: 10;
    transition: background var(--transition-fast), border-color var(--transition-fast);
  }

  .site-nav__close:hover {
    background: rgba(255, 78, 0, 0.15);
    border-color: var(--color-primary);
  }

  .site-nav__list {
    gap: 2px;
  }

  .site-nav__cta {
    margin-top: 20px;
  }

  .to-top {
    display: none;
  }

  body.nav-lock {
    overflow: hidden;
  }

  #main-content {
    margin-left: 0;
    padding-top: 64px;
  }

  .site-footer {
    margin-left: 0;
    padding: 48px 20px 24px;
  }

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

  .container {
    padding: 0 20px;
  }

  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: 1fr;
  }

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

  .media-frame--wide {
    aspect-ratio: 16 / 10;
  }
}

@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 .reveal,
  .js .reveal.is-visible {
    opacity: 1 !important;
    transform: none !important;
  }

  .media-frame img,
  .site-nav__link,
  .btn,
  .brand,
  .site-nav,
  .nav-toggle__bar {
    transition: none !important;
  }
}