:root {
  --bg:#050507;
  --panel:#0d0e12;
  --lime:#caff37;
  --violet:#8f6cff;
  --text:#f7f7f3;
  --muted:#989aa5;
  --line:#24262d;
}
* { box-sizing:border-box }
html { scroll-behavior:smooth }
body {
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;
  overflow-x:hidden;
}
.noise {
  position:fixed;
  inset:0;
  opacity:.04;
  pointer-events:none;
  background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.7'/%3E%3C/svg%3E");
}
.container {
  width:min(1220px,calc(100% - 40px));
  margin:auto;
}
.topline {
  height:5px;
  background:linear-gradient(90deg,var(--lime),var(--violet),#20d9ff);
}
nav {
  height:74px;
  border-bottom:1px solid var(--line);
  display:flex;
  align-items:center;
  position:relative;
  z-index:5;
}
.nav {
  display:flex;
  align-items:center;
  justify-content:space-between;
}
.logo {
  display:inline-flex;
  align-items:center;
  gap:10px;
  text-decoration:none;
  color:var(--text);
  font-weight:800;
  font-size:15px;
  letter-spacing:.04em;
}
.logo::before {
  content:"◆";
  color:var(--lime);
  font-size:11px;
}
.links {
  display:flex;
  gap:28px;
}
.links a {
  color:var(--muted);
  text-decoration:none;
  font-size:13px;
  text-transform:uppercase;
  letter-spacing:.1em;
}
.join {
  border:1px solid var(--lime);
  color:var(--lime);
  padding:11px 16px;
  text-decoration:none;
  font-weight:800;
}
.hero {
  min-height:790px;
  display:flex;
  align-items:center;
  position:relative;
}
.hero-grid {
  display:grid;
  grid-template-columns:1.05fr .95fr;
  gap:54px;
  align-items:center;
  position:relative;
  z-index:1;
}
.pcb-bg {
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  pointer-events:none;
  opacity:.22;
  z-index:0;
}
.hero h1 {
  font-size:clamp(54px,8vw,104px);
  line-height:.9;
  letter-spacing:-.06em;
  margin:24px 0 30px;
  text-transform:uppercase;
}
.hero h1 i {
  font-style:normal;
  color:transparent;
  -webkit-text-stroke:1px #b6b8c0;
}
.hero p {
  font-size:17px;
  color:var(--muted);
  line-height:1.8;
  max-width:600px;
}
.actions {
  display:flex;
  gap:12px;
  margin-top:34px;
}
.btn {
  background:var(--lime);
  color:#070808;
  text-decoration:none;
  padding:14px 22px;
  font-weight:900;
}
.btn.alt {
  background:transparent;
  color:white;
  border:1px solid var(--line);
}
.terminal {
  height:535px;
  border:1px solid #30323a;
  background:rgba(13,14,18,.82);
  position:relative;
  box-shadow:0 0 70px rgba(143,108,255,.12);
  overflow:hidden;
}
.terminal:before {
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(transparent 95%,rgba(202,255,55,.08) 95%);
  background-size:100% 9px;
  animation:scan 8s linear infinite;
}
.term-head {
  height:54px;
  border-bottom:1px solid var(--line);
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:0 18px;
  color:#737681;
  font:12px monospace;
}
.term-body {
  padding:26px;
  font:14px/1.7 monospace;
  color:#c1c5ce;
  position:relative;
}
.prompt { color:var(--lime) }
.purple { color:#ae91ff }
.scope {
  height:150px;
  margin-top:20px;
  position:relative;
  border-left:1px solid #2c2f36;
  border-bottom:1px solid #2c2f36;
}
.scope svg {
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
}
.status {
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:10px;
  margin-top:25px;
}
.status div {
  border:1px solid var(--line);
  padding:14px;
}
.status b {
  display:block;
  color:var(--lime);
  font-size:20px;
}
.status small { color:#797d88 }
.status .led {
  display:inline-block;
  width:8px;
  height:8px;
  border-radius:50%;
  background:var(--lime);
  box-shadow:0 0 8px var(--lime),0 0 14px rgba(202,255,55,.5);
  margin-left:10px;
  vertical-align:middle;
}
.cursor {
  display:inline-block;
  width:7px;
  height:16px;
  background:var(--lime);
  vertical-align:middle;
  animation:blink .8s steps(2) infinite;
}
.floating {
  position:absolute;
  background:var(--violet);
  color:white;
  font-weight:800;
  padding:14px 18px;
  right:-20px;
  bottom:45px;
  transform:rotate(4deg);
}
section {
  padding:105px 0;
  border-top:1px solid var(--line);
}
.section-title {
  display:flex;
  justify-content:space-between;
  align-items:end;
  margin:12px 0 46px;
}
.section-title h2 {
  font-size:48px;
  margin:0;
  max-width:650px;
}
.section-title p {
  color:var(--muted);
  max-width:450px;
  line-height:1.7;
}
.courses {
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:14px;
}
.course {
  background:var(--panel);
  border:1px solid var(--line);
  padding:32px;
  min-height:240px;
  position:relative;
  overflow:hidden;
  transition:.3s;
}
.course:hover {
  border-color:var(--lime);
  transform:translateY(-5px);
}
.course .index {
  color:#676a74;
  font:13px monospace;
}
.course h3 {
  font-size:30px;
  margin:46px 0 12px;
}
.course p {
  color:var(--muted);
  line-height:1.7;
  max-width:520px;
}
.arrow {
  position:absolute;
  right:24px;
  top:24px;
  color:var(--lime);
  font-size:24px;
}
.course:after {
  content:"";
  position:absolute;
  width:120px;
  height:120px;
  border:1px solid #2c2e35;
  border-radius:50%;
  right:-60px;
  bottom:-60px;
}
.track-anim {
  position:absolute;
  right:18px;
  bottom:14px;
  width:38%;
  height:32%;
  pointer-events:none;
  overflow:visible;
}
.workflow {
  display:grid;
  grid-template-columns:.85fr 1.15fr;
  gap:65px;
  align-items:stretch;
}
.method-intro {
  display:flex;
  flex-direction:column;
}
.method-stats { margin-top:auto }
.bigquote {
  font-size:42px;
  line-height:1.22;
  margin:15px 0;
}
.bigquote span { color:var(--lime) }
.workflow p {
  color:var(--muted);
  line-height:1.8;
}
.stage {
  display:grid;
  grid-template-columns:auto 1fr 160px;
  column-gap:28px;
  align-items:center;
  border-top:1px solid var(--line);
  padding:26px 0;
  position:relative;
}
.method-stages {
  display:grid;
  grid-template-columns:max-content 1fr 160px;
  column-gap:28px;
}
.method-stages .stage {
  grid-template-columns:subgrid;
  grid-column:1/-1;
  column-gap:inherit;
}
.method-stats {
  list-style:none;
  padding:0;
  margin:36px 0 0;
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:12px;
}
.method-stats .stat-item { padding:18px 16px }
.method-stats .stat-value { font-size:32px }
.method-stats .stat-label {
  font-size:10px;
  margin-top:6px;
}
.stage:last-child { border-bottom:1px solid var(--line) }
.stage-anim {
  width:160px;
  height:80px;
  pointer-events:none;
  opacity:0;
  justify-self:end;
}
@media(max-width:900px) {
  .stage-anim { display:none }
  .stage { grid-template-columns:auto 1fr }
  .method-stages { grid-template-columns:none }
}
.stage i {
  color:var(--violet);
  font-style:normal;
  font:14px monospace;
}
.stage h4 {
  font-size:22px;
  margin:0 0 8px;
}
.stage p { margin:0 }
.marquee {
  overflow:hidden;
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  padding:20px 0;
}
.marquee div {
  display:flex;
  width:max-content;
  gap:50px;
  animation:move 18s linear infinite;
  color:#4b4e57;
  font-size:42px;
  font-weight:900;
  white-space:nowrap;
}
.marquee b {
  color:var(--lime);
  display:inline-flex;
  align-items:center;
}
.marquee b .marquee-pulse {
  width:16px;
  height:16px;
  filter:drop-shadow(0 0 6px rgba(202,255,55,.8)) drop-shadow(0 0 12px rgba(202,255,55,.4));
}
.cta {
  padding:90px 0;
  text-align:center;
}
.cta h2 {
  font-size:64px;
  margin:0 0 16px;
  text-transform:uppercase;
}
.cta p {
  color:var(--muted);
  margin-bottom:32px;
}
footer {
  border-top:1px solid var(--line);
  padding:30px 0;
  color:#6f727d;
  font:12px monospace;
}
.footer {
  display:flex;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:16px 24px;
  align-items:center;
}
.footer-brand {
  display:flex;
  align-items:center;
}
.footer-logo {
  height:30px;
  width:auto;
  filter:brightness(0) invert(1);
}
.footer-info {
  display:flex;
  flex-direction:column;
  gap:6px;
  text-align:right;
}
.footer-icp {
  color:#6f727d;
  font-size:11px;
  text-decoration:none;
  letter-spacing:.04em;
  font-family:"PingFang SC","Microsoft YaHei",Arial,sans-serif;
}
.footer-icp:hover {
  color:var(--text);
}
.reveal {
  opacity:0;
  transform:translateY(30px);
  transition:.6s;
}
.reveal.on {
  opacity:1;
  transform:none;
}
@keyframes scan {
  to { background-position:0 90px }
}
@keyframes blink {
  50% { opacity:0 }
}
@keyframes move {
  to { transform:translateX(-50%) }
}
@media(max-width:900px) {
  .links { display:none }
  .hero-grid,.workflow { grid-template-columns:1fr }
  .hero { padding:70px 0 }
  .terminal { margin-top:20px }
  .section-title { display:block }
  .courses { grid-template-columns:1fr }
  .cta h2 { font-size:45px }
}
@media(max-width:560px) {
  .hero h1 { font-size:58px }
  .terminal { height:500px }
  .status { grid-template-columns:1fr }
  .floating { right:0 }
  .section-title h2 { font-size:38px }
}

.section-list h2 {
  font-size:42px;
  margin:12px 0 16px;
  max-width:780px;
  line-height:1.15;
}
.section-list > .container > p {
  color:var(--muted);
  line-height:1.8;
  max-width:760px;
  margin:0 0 50px;
}
.section-list ul {
  list-style:none;
  padding:0;
  margin:0;
}
.grid-2 {
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:18px;
}
.grid-3 {
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:18px;
}
.grid-flow {
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:18px;
}
.section-list li {
  background:var(--panel);
  border:1px solid var(--line);
  padding:26px;
  transition:.3s;
  position:relative;
  overflow:hidden;
}
.section-list li:hover {
  border-color:var(--lime);
  transform:translateY(-3px);
}
.section-list li h3 {
  color:var(--lime);
  font-size:18px;
  margin:0 0 12px;
  font-weight:800;
}
.section-list li p {
  color:var(--muted);
  line-height:1.7;
  margin:0;
  font-size:14px;
}
.grid-flow li {
  position:relative;
  padding-left:50px;
}
.grid-flow li::before {
  counter-increment:step;
  content:counter(step,decimal-leading-zero);
  position:absolute;
  left:18px;
  top:24px;
  color:var(--violet);
  font:14px monospace;
}
.grid-flow { counter-reset:step }
.section-list ul[data-variant="stats"] {
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:18px;
}
.section-list .stat-item { padding:30px 26px }
.section-list .stat-value {
  font-size:54px;
  font-weight:900;
  color:var(--lime);
  letter-spacing:-.03em;
  line-height:1;
}
.section-list .stat-label {
  margin-top:12px;
  font:12px monospace;
  color:var(--muted);
  letter-spacing:.1em;
  text-transform:uppercase;
}
.section-list ul[data-variant="features"] {
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:18px;
}
.section-list .feature-item {
  padding:26px 26px 26px 30px;
  position:relative;
  overflow:hidden;
}
.section-list .feature-item::before {
  content:"";
  position:absolute;
  left:0;
  top:0;
  width:3px;
  height:0;
  background:var(--lime);
  transition:height .4s;
}
.section-list .feature-item:hover::before {
  height:100%;
}
.section-list .feature-icon {
  font:12px monospace;
  color:var(--lime);
  letter-spacing:.1em;
}
.section-list .feature-item h3 {
  color:var(--text);
  font-size:20px;
  margin:14px 0 10px;
  font-weight:800;
}
.section-list .feature-body {
  color:var(--muted);
  line-height:1.7;
  font-size:14px;
  margin:0;
}
@media(max-width:900px) {
  .section-list ul[data-variant="stats"] { grid-template-columns:repeat(2,1fr) }
  .section-list ul[data-variant="features"] {
    grid-template-columns:repeat(2,1fr);
  }
}
@media(max-width:560px) {
  .section-list ul[data-variant="stats"],.section-list ul[data-variant="features"] {
    grid-template-columns:1fr;
  }
}
.page-hero {
  padding:120px 0 80px;
  border-bottom:1px solid var(--line);
}
.page-hero h1 {
  font-size:clamp(40px,6vw,72px);
  margin:18px 0 24px;
  line-height:1.05;
  letter-spacing:-.04em;
  max-width:920px;
}
.page-hero p {
  color:var(--muted);
  font-size:18px;
  line-height:1.8;
  max-width:780px;
  margin:0;
}
.page-hero .actions { margin-top:38px }
.faq-list {
  display:grid;
  grid-template-columns:1fr;
  gap:14px;
}
.faq-item {
  background:var(--panel);
  border:1px solid var(--line);
  padding:28px 32px;
}
.faq-item h3 {
  color:var(--lime);
  font-size:18px;
  margin:0 0 12px;
  font-weight:700;
  line-height:1.4;
}
.faq-item p {
  color:var(--muted);
  line-height:1.8;
  margin:0;
  font-size:15px;
}
.contact-grid {
  display:grid;
  grid-template-columns:1.2fr .8fr;
  gap:60px;
  align-items:start;
}
.contact-info li {
  list-style:none;
  padding:18px 0;
  border-bottom:1px solid var(--line);
}
.contact-info li h3 {
  color:var(--lime);
  font:13px monospace;
  margin:0 0 6px;
}
.contact-info li p {
  color:var(--text);
  font-size:18px;
  margin:0;
  line-height:1.6;
}
.contact-cta {
  background:var(--panel);
  border:1px solid var(--lime);
  padding:32px;
}
.contact-cta h3 {
  color:var(--lime);
  margin:0 0 12px;
  font-size:22px;
}
.contact-cta p {
  color:var(--muted);
  line-height:1.7;
  margin:0 0 22px;
  font-size:14px;
}
.contact-cta .btn { display:inline-block }
@media(max-width:900px) {
  .grid-3,.grid-flow { grid-template-columns:repeat(2,1fr) }
  .contact-grid {
    grid-template-columns:1fr;
    gap:30px;
  }
}
@media(max-width:768px) {
  .hero h1 { font-size:48px }
  .section-title h2 { font-size:36px }
  .section-list h2 { font-size:32px }
  .cta h2 { font-size:38px }
  .bigquote { font-size:30px }
  .method-stats .stat-value { font-size:26px }
  .page-hero h1 { font-size:36px }
}
@media(max-width:414px) {
  .hero h1 { font-size:38px }
  .section-title h2 { font-size:28px }
  .cta h2 { font-size:30px }
  .bigquote { font-size:24px }
  .section-list li { padding:18px }
  .courses { grid-template-columns:1fr }
  .page-hero { padding:80px 0 50px }
  .method-stats { grid-template-columns:1fr }
}
@media(min-width:1440px) {
  .container { width:min(1320px,calc(100% - 60px)) }
  .hero h1 { font-size:114px }
  .section-list h2 { font-size:48px }
  .section-title h2 { font-size:56px }
}
@media(max-width:560px) {
  .grid-2,.grid-3,.grid-flow { grid-template-columns:1fr }
  .section-list h2 { font-size:32px }
}

.load-failed::before{content:"内容加载失败,请刷新页面";position:fixed;top:0;left:0;right:0;background:#ff3b3b;color:#fff;padding:14px;text-align:center;font:14px monospace;z-index:9999}

#loader{position:fixed;inset:0;background:var(--bg);z-index:9998;display:flex;align-items:center;justify-content:center;transition:opacity .4s ease-out}
body.loaded #loader,body.load-failed #loader{opacity:0;pointer-events:none}
.loader-spinner{animation:loader-spin 1.2s linear infinite}
@keyframes loader-spin{to{transform:rotate(360deg)}}
@media (prefers-reduced-motion:reduce){.loader-spinner{animation-duration:3s}}

/* 候选 B — touch 设备禁用 hover 视觉变化。touch 设备 :hover 在 tap 后会粘住,
   border/transform 长期挂着造成视觉错乱。hover 媒体查询精确区分能力。*/
@media (hover:none),(pointer:coarse){.course:hover,.section-list li:hover{border-color:var(--line);transform:none}.section-list .feature-item:hover::before{height:0}}

/* 候选 D — 键盘焦点可见。鼠标点击不显示轮廓,Tab 导航清晰可见。*/
.btn:focus-visible,.join:focus-visible,.links a:focus-visible,.logo:focus-visible{outline:2px solid var(--lime);outline-offset:3px}

/* 装饰前缀统一驱动 — section 在 HTML 上声明 data-h3-prefix / data-li-prefix,
   renderSectionList / renderFaq 复制到每个 h3 / li,这里单点渲染。
   原本 13 条分散在 css/pages/*.css 的 .page-X .SECTION li h3::before 全部删除。*/
.section-list li h3[data-h3-prefix]::before,
.faq .faq-item h3[data-h3-prefix]::before{content:attr(data-h3-prefix) " ";color:var(--lime)}
.section-list li h3[data-h3-accent="violet"]::before,
.faq .faq-item h3[data-h3-accent="violet"]::before{color:var(--violet)}
.section-list li h3[data-h3-mono]::before,
.faq .faq-item h3[data-h3-mono]::before{font-family:monospace;font-size:.8em}
.section-list li[data-li-prefix]::before{content:attr(data-li-prefix) " ";color:var(--lime)}
.section-list li[data-li-accent="violet"]::before{color:var(--violet)}
.section-list li[data-li-bold]::before{font-weight:800}