:root {
  color-scheme: dark;
  --bg: #0a192f;
  --bg-alt: #0a1a2f;
  --bg-card: #112240;
  --accent: #ff6b35;
  --accent-2: #39ff14;
  --text: #e6f1ff;
  --text-muted: #8892b0;
  --border: #233554;
  --positive: #64ffda;
  --warning: #ffd700;
  --font-display: "Archivo Black", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Inter", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", "Menlo", monospace;
  --fs-display: 3rem;
  --fs-h1: 2.5rem;
  --fs-h2: 2rem;
  --fs-h3: 1.5rem;
  --fs-body: 1rem;
  --fs-small: .875rem;
  --lh-head: 1.1;
  --lh-body: 1.6;
  --container: 1200px;
  --header-h: 72px;
}

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

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  min-height: 100vh;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

main {
  display: block;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: var(--lh-head);
  color: var(--text);
}

h1 {
  font-size: var(--fs-h1);
}

h2 {
  font-size: var(--fs-h2);
}

h3 {
  font-size: var(--fs-h3);
}

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

ul[class], ol[class] {
  list-style: none;
}

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

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

.container {
  width: min(100% - 48px, var(--container));
  margin-inline: auto;
}

.visually-hidden {
  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: -80px;
  left: 16px;
  z-index: 1100;
  padding: 12px 20px;
  background: var(--accent);
  color: var(--bg);
  font-weight: 600;
  transition: top .2s ease;
}

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

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

::selection {
  background: var(--accent);
  color: var(--bg);
}

body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent) 0 30%, var(--accent-2) 30% 52%, var(--border) 52%);
  transform: scaleX(var(--scroll-progress, 0));
  transform-origin: 0 50%;
  z-index: 1001;
  pointer-events: none;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-family: var(--font-mono);
  font-size: .875rem;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  line-height: 1.2;
  color: var(--text);
  background: transparent;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: background .2s ease, color .2s ease, border-color .2s ease, transform .2s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

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

.btn-primary:hover {
  background: #ff8758;
  border-color: #ff8758;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10, 25, 47, .85);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.site-header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--accent) 0 28%, var(--accent-2) 28% 46%, transparent 46%);
}

.header-inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: var(--header-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  transition: opacity .2s ease;
}

.brand:hover {
  opacity: .92;
}

.brand-mark {
  position: relative;
  flex: 0 0 32px;
  width: 32px;
  height: 32px;
  background: var(--accent);
  clip-path: polygon(0 0, 100% 0, 72% 100%, 28% 100%);
}

.brand-mark::after {
  content: "";
  position: absolute;
  top: 9px;
  left: 9px;
  width: 12px;
  height: 9px;
  background: var(--accent-2);
  clip-path: polygon(0 0, 100% 0, 70% 100%, 30% 100%);
}

.brand-text {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 900;
  letter-spacing: .02em;
}

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

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav-item {
  margin: 0;
  padding: 0;
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 10px 14px;
  font-size: .9375rem;
  color: var(--text-muted);
  transition: color .2s ease;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 4px;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform .2s ease;
}

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

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

.nav-link[aria-current="page"]::after,
.nav-link[aria-current="true"]::after {
  transform: scaleX(1);
}

@media (hover: hover) {
  .nav-link:hover::after {
    transform: scaleX(1);
  }
}

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

.header-actions .btn {
  padding: 8px 16px;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: transparent;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: border-color .2s ease;
}

.nav-toggle-line {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  transition: transform .2s ease, opacity .2s ease;
}

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

.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);
}

.page-hero {
  position: relative;
  padding: 96px 0 112px;
  overflow: hidden;
  background: linear-gradient(135deg, var(--bg-alt), var(--bg) 60%);
}

.page-hero::before {
  content: "";
  position: absolute;
  top: -80px;
  right: -60px;
  width: 46%;
  height: 340px;
  background: var(--accent);
  clip-path: polygon(18% 0, 100% 0, 100% 100%, 0 100%);
  opacity: .45;
}

.page-hero::after {
  content: "";
  position: absolute;
  right: 30%;
  bottom: -140px;
  width: 52%;
  height: 280px;
  background: var(--accent-2);
  clip-path: polygon(0 0, 100% 15%, 100% 100%, 0 60%);
  opacity: .12;
}

.page-hero-tag {
  display: block;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent);
}

.page-hero-title {
  font-family: var(--font-display);
  font-size: var(--fs-h1);
  line-height: var(--lh-head);
  color: var(--text);
  margin-bottom: 16px;
  max-width: 720px;
}

.page-hero-subtitle {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--text-muted);
  max-width: 620px;
}

.section {
  padding: 64px 0;
}

.section + .section {
  padding-top: 0;
}

.section-heading {
  position: relative;
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  line-height: var(--lh-head);
  color: var(--text);
  margin-bottom: 8px;
  padding-left: 20px;
}

.section-heading::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 6px;
  background: linear-gradient(var(--accent), var(--accent-2));
}

.section-lead {
  color: var(--text-muted);
  max-width: 640px;
  margin-bottom: 24px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: .8125rem;
  color: var(--text-muted);
  padding: 20px 0 0;
}

.breadcrumb-link {
  color: var(--text-muted);
  transition: color .2s ease;
}

.breadcrumb-link:hover {
  color: var(--accent);
}

.breadcrumb-sep {
  opacity: .5;
}

.breadcrumb-current {
  color: var(--text);
}

.prose {
  color: var(--text);
  line-height: var(--lh-body);
}

.prose h2 {
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  line-height: var(--lh-head);
  margin: 40px 0 16px;
}

.prose h3 {
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  margin: 32px 0 12px;
}

.prose p {
  margin: 0 0 16px;
}

.prose a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.prose strong {
  color: var(--text);
  font-weight: 600;
}

.prose ul {
  margin: 0 0 16px;
  padding-left: 20px;
  list-style: none;
}

.prose ul li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 8px;
}

.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .55em;
  width: 6px;
  height: 6px;
  background: var(--accent);
  clip-path: polygon(100% 0, 0 100%, 100% 100%);
}

.card {
  position: relative;
  overflow: hidden;
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--accent);
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: 0 12px 30px rgba(0, 0, 0, .25);
}

.card-title {
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  line-height: var(--lh-head);
  color: var(--text);
  margin-bottom: 8px;
}

.card-meta {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

.card-body {
  color: var(--text-muted);
  font-size: .9375rem;
  line-height: 1.6;
}

.card-note {
  margin-top: 16px;
  font-size: .8125rem;
  color: var(--text-muted);
}

.card--green::before {
  background: var(--accent-2);
}

.card--orange::before {
  background: var(--accent);
}

.tabs {
  margin: 24px 0;
}

.tab-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.tab-button {
  padding: 8px 18px;
  font-family: var(--font-mono);
  font-size: .875rem;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: color .2s ease, background .2s ease, border-color .2s ease;
}

.tab-button:hover {
  color: var(--text);
  border-color: var(--accent);
}

.tab-button.is-active,
.tab-button[aria-selected="true"] {
  color: var(--bg);
  background: var(--accent);
  border-color: var(--accent);
}

.tab-panel {
  padding: 24px 0;
}

.tab-panel[hidden] {
  display: none;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.image-figure {
  position: relative;
  margin: 24px 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  overflow: hidden;
}

.image-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.image-figure figcaption {
  padding: 12px 16px;
  font-size: .8125rem;
  color: var(--text-muted);
  background: var(--bg-card);
  border-top: 1px solid var(--border);
}

.image-figure--ratio {
  position: relative;
  padding-bottom: 56.25%;
}

.image-figure--ratio img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.image-figure--ratio figcaption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
}

.site-footer {
  position: relative;
  margin-top: 80px;
  padding: 64px 0 32px;
  background: var(--bg-alt);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent) 0 30%, var(--accent-2) 30% 50%, transparent 50%);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.2fr;
  gap: 40px 48px;
}

.footer-brand .brand {
  margin-bottom: 16px;
}

.footer-trust {
  font-size: .9375rem;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 360px;
}

.footer-heading {
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: .02em;
  color: var(--text);
  margin-bottom: 16px;
  text-transform: uppercase;
}

.footer-links,
.footer-legal-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.footer-link {
  font-size: .9375rem;
  color: var(--text-muted);
  transition: color .2s ease;
}

.footer-link:hover {
  color: var(--accent);
}

.footer-contact {
  font-family: var(--font-mono);
  font-size: .8125rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  word-break: break-all;
}

.footer-address {
  font-size: .875rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-top: 12px;
}

.footer-legal {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.footer-legal-links {
  display: flex;
  gap: 20px;
}

.footer-copy,
.footer-icp {
  font-family: var(--font-mono);
  font-size: .8125rem;
  color: var(--text-muted);
}

.scroll-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 900;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: .75rem;
  font-weight: 600;
  color: var(--bg);
  background: var(--accent);
  border: 1px solid var(--accent);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity .2s ease, transform .2s ease, visibility .2s ease, background .2s ease;
}

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

.scroll-top:hover {
  background: #ff8758;
}

@media (max-width: 1023px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: block;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 16px 24px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity .2s ease, transform .2s ease, visibility .2s ease;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
  }

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

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav-link {
    padding: 14px 8px;
    border-bottom: 1px solid var(--border);
  }

  .nav-link::after {
    display: none;
  }

  .nav-link[aria-current="page"],
  .nav-link[aria-current="true"] {
    background: rgba(255, 107, 53, .08);
  }

  .header-actions .btn {
    display: none;
  }

  .page-hero {
    padding: 64px 0 80px;
  }

  .page-hero-title {
    font-size: var(--fs-h2);
  }
}

@media (max-width: 900px) {
  .grid-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-legal {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}

@media (max-width: 640px) {
  .container {
    width: min(100% - 24px, var(--container));
  }

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }

  body::before {
    display: none;
  }
}