:root {
  color-scheme: dark;
  --bg: #05070a;
  --panel: rgba(13, 19, 28, .78);
  --panel-strong: rgba(18, 29, 40, .92);
  --glass: rgba(185, 230, 255, .09);
  --line: rgba(176, 225, 255, .24);
  --line-strong: rgba(123, 230, 255, .56);
  --text: #eef8ff;
  --muted: #a9bac7;
  --cyan: #4fd8ff;
  --lime: #95f084;
  --amber: #ffcc66;
  --coral: #ff7c70;
  --shadow: 0 24px 80px rgba(0, 0, 0, .42);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background:
    linear-gradient(180deg, rgba(7, 15, 24, .96), var(--bg) 40%, #030405 100%);
  color: var(--text);
  letter-spacing: 0;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(rgba(79, 216, 255, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(79, 216, 255, .04) 1px, transparent 1px);
  background-size: 68px 68px;
  mask-image: linear-gradient(to bottom, rgba(0,0,0,.9), transparent 78%);
}
a { color: inherit; }
img { display: block; max-width: 100%; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 22px;
  align-items: center;
  padding: 14px clamp(16px, 4vw, 54px);
  border-bottom: 1px solid var(--line);
  background: rgba(4, 7, 11, .82);
  backdrop-filter: blur(18px);
}
.brand {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  text-decoration: none;
  font-weight: 900;
  white-space: nowrap;
}
.brand-mark {
  width: 30px;
  height: 30px;
  border: 1px solid var(--line-strong);
  border-radius: 9px;
  background:
    linear-gradient(135deg, rgba(79,216,255,.28), rgba(149,240,132,.12)),
    rgba(255,255,255,.04);
  box-shadow: inset 0 0 18px rgba(79,216,255,.22), 0 0 22px rgba(79,216,255,.18);
  position: relative;
}
.brand-mark::after {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid rgba(255,255,255,.54);
  border-radius: 999px;
}
#site-nav {
  display: flex;
  justify-content: flex-end;
  gap: 18px;
  align-items: center;
  flex-wrap: wrap;
}
#site-nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 800;
}
#site-nav a:hover { color: var(--cyan); }
.menu-button {
  display: none;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.06);
  color: var(--text);
  border-radius: 8px;
  padding: 9px 12px;
  font-weight: 900;
}
main { position: relative; overflow: hidden; }
.obsidian-stage {
  max-width: 1280px;
  min-height: 680px;
  margin: 0 auto;
  padding: clamp(34px, 6vw, 74px) clamp(16px, 4vw, 46px) 34px;
  display: grid;
  grid-template-columns: minmax(0, .86fr) minmax(420px, 1.14fr);
  gap: clamp(24px, 4vw, 48px);
  align-items: center;
  position: relative;
}
.stage-copy { position: relative; z-index: 2; }
.signal-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 12px;
  color: var(--lime);
  font-size: 13px;
  font-weight: 900;
  text-transform: uppercase;
}
.signal-label::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--lime);
  box-shadow: 0 0 16px var(--lime);
}
h1, h2, h3, p { overflow-wrap: anywhere; }
.stage-copy h1,
.inner-hero h1,
.article-head h1 {
  margin: 0 0 18px;
  font-size: clamp(42px, 6.8vw, 86px);
  line-height: .98;
  max-width: 820px;
}
.lead {
  margin: 0;
  color: #c4d5df;
  line-height: 1.8;
  font-size: clamp(17px, 2vw, 22px);
  max-width: 760px;
}
.stage-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}
.primary-action,
.ghost-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 12px 18px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 900;
}
.primary-action {
  color: #031015;
  background: linear-gradient(135deg, var(--cyan), var(--lime));
  box-shadow: 0 0 28px rgba(79,216,255,.22);
}
.ghost-action {
  border: 1px solid var(--line-strong);
  background: rgba(255,255,255,.05);
  color: var(--text);
}
.small { min-height: 38px; padding: 9px 13px; }
.stage-visual {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 24px;
  overflow: hidden;
  background: rgba(255,255,255,.04);
  box-shadow: var(--shadow), inset 0 0 38px rgba(79,216,255,.08);
}
.stage-visual img {
  width: 100%;
  aspect-ratio: 16 / 9;
  height: auto;
  object-fit: cover;
}
.glass-strip {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255,255,255,.05);
  backdrop-filter: blur(16px);
}
.glass-strip span {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  padding: 14px;
  border-radius: 12px;
  background: rgba(6, 11, 17, .56);
  color: #dceaf2;
  font-weight: 900;
}
.glass-strip b { color: var(--amber); }
.subscription-board,
.client-console,
.node-horizon,
.article-console,
.support-grid,
.issue-grid,
.contrast-panels,
.first-run-rail,
.contact-note,
.timeline,
.plain-prose,
.archive-grid {
  max-width: 1180px;
  margin: 62px auto;
  padding: 0 clamp(16px, 4vw, 34px);
}
.section-copy {
  max-width: 760px;
  margin-bottom: 22px;
}
.section-copy h2,
.section-title-row h2,
.first-run-rail h2,
.contact-note h2 {
  margin: 0 0 10px;
  font-size: clamp(28px, 4vw, 52px);
  line-height: 1.08;
}
.section-copy p { color: var(--muted); line-height: 1.85; }
.plan-rails {
  display: grid;
  gap: 12px;
}
.plan-rail {
  display: grid;
  grid-template-columns: 1.1fr 1.35fr .72fr;
  gap: 18px;
  align-items: center;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(255,255,255,.08), rgba(255,255,255,.025));
  box-shadow: inset 0 0 26px rgba(79,216,255,.06);
}
.plan-rail span {
  display: block;
  color: var(--amber);
  font-weight: 950;
  font-size: 20px;
}
.plan-rail p {
  margin: 6px 0 0;
  color: var(--muted);
  line-height: 1.7;
}
.plan-rail b {
  justify-self: end;
  color: var(--lime);
  font-size: 14px;
}
.section-title-row {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 22px;
}
.inline-link {
  color: var(--cyan);
  text-decoration-thickness: 2px;
  text-underline-offset: 5px;
  font-weight: 900;
}
.device-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}
.device-pane,
.node-pane,
.article-card a,
.issue-pane,
.contrast-panels article,
.contact-desk article,
.archive-grid article a {
  display: block;
  height: 100%;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.08);
  text-decoration: none;
}
.device-pane h3,
.issue-pane h2,
.contrast-panels h2,
.contact-desk h2 {
  margin: 0 0 10px;
  font-size: 22px;
}
.device-pane p,
.node-pane p,
.node-pane small,
.article-card p,
.issue-pane p,
.contrast-panels p,
.contact-desk p,
.plain-prose p,
.archive-grid p {
  color: var(--muted);
  line-height: 1.8;
}
.device-pane div {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}
.device-pane span {
  border: 1px solid rgba(255,255,255,.16);
  color: #d9f8ff;
  border-radius: 999px;
  padding: 6px 9px;
  font-size: 13px;
  font-weight: 800;
}
.node-horizon {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding-top: 38px;
  padding-bottom: 38px;
}
.node-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}
.node-pane strong {
  display: block;
  color: var(--cyan);
  font-size: 21px;
}
.node-pane small {
  display: block;
  margin-top: 14px;
  color: var(--amber);
}
.article-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}
.article-console.full .article-grid { grid-template-columns: repeat(3, 1fr); }
.article-card time {
  display: block;
  color: var(--lime);
  font-size: 13px;
  font-weight: 900;
  margin-bottom: 10px;
}
.article-card strong {
  display: block;
  font-size: 19px;
  line-height: 1.35;
}
.article-card span {
  display: inline-flex;
  margin-top: 12px;
  color: var(--amber);
  font-size: 13px;
  font-weight: 900;
}
.support-grid {
  display: grid;
  grid-template-columns: .68fr 1.32fr;
  gap: 24px;
}
.support-grid.solo { display: block; max-width: 900px; }
.answer-stack {
  display: grid;
  gap: 10px;
}
details {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255,255,255,.055);
  padding: 16px 18px;
}
summary {
  cursor: pointer;
  font-weight: 900;
  color: #ecf8ff;
}
details p { color: var(--muted); line-height: 1.78; }
.inner-hero {
  max-width: 1180px;
  margin: 0 auto;
  padding: clamp(44px, 7vw, 92px) clamp(16px, 4vw, 34px) 28px;
  border-bottom: 1px solid var(--line);
}
.first-run-rail {
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--panel-strong);
  padding-top: 26px;
  padding-bottom: 26px;
}
.first-run-rail ol {
  margin: 0;
  padding-left: 22px;
  display: grid;
  gap: 14px;
  color: var(--muted);
  line-height: 1.8;
}
.contrast-panels,
.contact-desk,
.issue-grid,
.archive-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}
.contact-desk {
  max-width: 1180px;
  margin: 54px auto;
  padding: 0 clamp(16px, 4vw, 34px);
  grid-template-columns: repeat(3, 1fr);
}
.issue-grid { grid-template-columns: repeat(5, 1fr); }
.contact-note {
  border: 1px solid var(--line-strong);
  border-radius: 22px;
  background: rgba(79,216,255,.08);
  padding-top: 26px;
  padding-bottom: 26px;
}
.contact-note p { color: var(--muted); line-height: 1.85; }
.timeline {
  display: grid;
  gap: 12px;
}
.timeline article {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 18px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--panel);
  padding: 18px;
}
.timeline time { color: var(--amber); font-weight: 900; }
.timeline p { margin: 0; color: var(--muted); line-height: 1.7; }
.article-head {
  max-width: 1020px;
  margin: 0 auto;
  padding: clamp(44px, 7vw, 92px) clamp(16px, 4vw, 34px) 26px;
}
.article-head time {
  display: inline-flex;
  margin-top: 18px;
  color: var(--lime);
  font-weight: 900;
}
.article-shell {
  max-width: 1180px;
  margin: 32px auto;
  padding: 0 clamp(16px, 4vw, 34px);
  display: grid;
  grid-template-columns: 230px 1fr;
  gap: 28px;
  align-items: start;
}
.chapter-nav {
  position: sticky;
  top: 86px;
  display: grid;
  gap: 8px;
}
.chapter-nav a {
  color: var(--muted);
  text-decoration: none;
  border-left: 2px solid var(--line);
  padding: 9px 10px;
  font-weight: 800;
}
.chapter-nav a:hover { color: var(--cyan); border-color: var(--cyan); }
.article-body section {
  scroll-margin-top: 96px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255,255,255,.055);
  padding: 24px;
  margin-bottom: 14px;
}
.article-body h2 {
  margin: 0 0 12px;
  font-size: clamp(23px, 3vw, 36px);
}
.article-body p { color: #c6d5de; line-height: 1.95; }
.related-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-top: 22px;
}
.related-links span { font-weight: 900; }
.related-links a {
  text-decoration: none;
  color: var(--cyan);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 12px;
  font-weight: 900;
}
.plain-prose { max-width: 900px; }
.archive-grid { grid-template-columns: repeat(4, 1fr); }
.site-footer {
  margin-top: 70px;
  padding: 34px clamp(16px, 4vw, 54px);
  border-top: 1px solid var(--line);
  background: #030507;
  display: grid;
  grid-template-columns: minmax(220px, .75fr) minmax(0, 1.25fr);
  gap: 26px;
}
.footer-brand p {
  color: var(--muted);
  line-height: 1.75;
  margin: 8px 0 0;
}
.footer-groups {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.footer-groups nav {
  display: grid;
  gap: 8px;
  align-content: start;
}
.footer-groups span {
  color: var(--amber);
  font-weight: 900;
}
.footer-groups a {
  color: var(--muted);
  text-decoration: none;
  font-weight: 800;
}
.footer-groups a:hover { color: var(--cyan); }
@media (max-width: 980px) {
  .site-header { grid-template-columns: 1fr auto; }
  .menu-button { display: inline-flex; }
  #site-nav {
    grid-column: 1 / -1;
    display: none;
    justify-content: start;
  }
  #site-nav.open { display: flex; }
  .obsidian-stage,
  .support-grid,
  .article-shell,
  .site-footer {
    grid-template-columns: 1fr;
  }
  .stage-visual { order: -1; }
  .device-grid,
  .node-list,
  .article-grid,
  .article-console.full .article-grid,
  .issue-grid,
  .archive-grid,
  .footer-groups {
    grid-template-columns: repeat(2, 1fr);
  }
  .glass-strip,
  .contact-desk,
  .contrast-panels {
    grid-template-columns: 1fr 1fr;
  }
  .chapter-nav { position: static; grid-template-columns: repeat(2, 1fr); }
  .plan-rail { grid-template-columns: 1fr; }
  .plan-rail b { justify-self: start; }
}
@media (max-width: 560px) {
  .site-header { padding: 12px 15px; gap: 10px; }
  .brand span:last-child { max-width: 220px; overflow: hidden; text-overflow: ellipsis; }
  .obsidian-stage { min-height: auto; padding-top: 20px; }
  .stage-copy h1,
  .inner-hero h1,
  .article-head h1 {
    font-size: 38px;
    line-height: 1.06;
  }
  .lead { font-size: 17px; }
  .stage-actions,
  .glass-strip,
  .device-grid,
  .node-list,
  .article-grid,
  .article-console.full .article-grid,
  .issue-grid,
  .archive-grid,
  .footer-groups,
  .contact-desk,
  .contrast-panels,
  .chapter-nav {
    grid-template-columns: 1fr;
  }
  .primary-action,
  .ghost-action { width: 100%; }
  .timeline article { grid-template-columns: 1fr; }
  .stage-visual { border-radius: 18px; }
  .site-footer { gap: 22px; }
}