:root {
  --bg: #040812;
  --bg-2: #0a1528;
  --panel: rgba(7, 13, 24, 0.78);
  --panel-strong: rgba(11, 19, 34, 0.92);
  --line: rgba(168, 206, 255, 0.12);
  --line-strong: rgba(168, 206, 255, 0.28);
  --text: #edf5ff;
  --muted: #a3b4cb;
  --muted-2: #71849f;
  --cyan: #79e8ff;
  --blue: #78aaff;
  --violet: #b399ff;
  --emerald: #6af1cf;
  --amber: #ffcf77;
  --shadow: 0 28px 90px rgba(0, 0, 0, 0.46);
  --radius-xl: 34px;
  --radius-lg: 24px;
  --radius-md: 18px;
  --container: min(1360px, calc(100vw - 28px));
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body.signal-body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 10% 0%, rgba(79, 141, 255, 0.18), transparent 26%),
    radial-gradient(circle at 88% 4%, rgba(121, 232, 255, 0.16), transparent 24%),
    radial-gradient(circle at 78% 38%, rgba(179, 153, 255, 0.1), transparent 26%),
    linear-gradient(180deg, #040812 0%, #091221 34%, #08111d 58%, #050910 100%);
  font: 16px/1.7 "Avenir Next", "SF Pro Display", "PingFang SC", "Hiragino Sans GB", sans-serif;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
.signal-container { width: var(--container); margin: 0 auto; }
.glass-panel {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}
.glass-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  border-radius: inherit;
  background: linear-gradient(180deg, rgba(255,255,255,0.05), transparent 20%, transparent 82%, rgba(255,255,255,0.02));
}
.signal-topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(20px);
  background: rgba(4, 8, 18, 0.74);
  border-bottom: 1px solid rgba(168, 206, 255, 0.08);
}
.signal-topbar-inner {
  min-height: 84px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.signal-brand {
  display: flex;
  align-items: center;
  gap: 14px;
}
.signal-brand-mark {
  width: 52px;
  height: 52px;
  border-radius: 18px;
  display: grid;
  place-items: center;
  background: radial-gradient(circle at 30% 30%, rgba(121,232,255,0.28), rgba(13,18,36,0.8) 60%), linear-gradient(135deg, rgba(121,232,255,0.14), rgba(120,170,255,0.1));
  border: 1px solid rgba(121,232,255,0.22);
  box-shadow: 0 14px 32px rgba(121, 232, 255, 0.14);
  overflow: hidden;
}
.signal-brand-mark img { width: 100%; height: 100%; object-fit: cover; }
.signal-brand-copy strong,
.signal-brand-copy em {
  display: block;
}
.signal-brand-copy strong {
  font-size: 16px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.signal-brand-copy em {
  font-style: normal;
  color: var(--muted);
  font-size: 12px;
}
.signal-nav {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.signal-nav a {
  padding: 10px 14px;
  border-radius: 999px;
  color: var(--muted);
  transition: all .2s ease;
}
.signal-nav a.current,
.signal-nav a:hover {
  color: var(--text);
  background: rgba(255,255,255,0.05);
}
.signal-main {
  padding: 28px 0 52px;
}
.signal-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.22fr) minmax(340px, 0.88fr);
  gap: 24px;
  margin-bottom: 30px;
}
.signal-hero-copy,
.signal-hero-visual,
.signal-post-card,
.signal-column-panel,
.signal-article-panel,
.signal-comments {
  border-radius: var(--radius-xl);
}
.signal-hero-copy {
  padding: 42px;
  overflow: hidden;
}
.signal-kicker,
.signal-section-head span,
.signal-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 34px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid rgba(121, 232, 255, 0.24);
  background: rgba(121, 232, 255, 0.08);
  color: var(--cyan);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.signal-hero-copy h1 {
  margin: 18px 0 18px;
  font-size: clamp(42px, 7vw, 80px);
  line-height: 0.96;
  letter-spacing: -0.055em;
  max-width: 10ch;
}
.signal-hero-copy p {
  max-width: 43rem;
  color: var(--muted);
  font-size: 18px;
}
.signal-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}
.signal-btn {
  min-height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 22px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.03);
  color: var(--text);
  transition: transform .2s ease, border-color .2s ease, background .2s ease;
}
.signal-btn:hover { transform: translateY(-1px); border-color: rgba(255,255,255,0.22); }
.signal-btn.primary {
  color: #061019;
  border: none;
  background: linear-gradient(135deg, var(--cyan), var(--blue));
  box-shadow: 0 14px 36px rgba(111, 230, 255, 0.22);
}
.signal-stats {
  margin-top: 28px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}
.signal-stats div {
  padding: 18px 18px 16px;
  border-radius: 20px;
  border: 1px solid rgba(255,255,255,0.06);
  background: rgba(255,255,255,0.03);
}
.signal-stats strong {
  display: block;
  font-size: 28px;
  line-height: 1;
}
.signal-stats span {
  display: block;
  margin-top: 8px;
  color: var(--muted-2);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.signal-hero-visual {
  min-height: 620px;
  overflow: hidden;
  background:
    radial-gradient(circle at 50% 35%, rgba(121,232,255,0.1), transparent 28%),
    linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
}
.signal-orbit,
.signal-node { position: absolute; }
.signal-orbit {
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.1);
}
.orbit-a { inset: 12% 14% auto auto; width: 300px; height: 300px; }
.orbit-b { inset: 22% 26% auto auto; width: 250px; height: 250px; }
.orbit-c { inset: 34% 18% auto auto; width: 370px; height: 370px; }
.signal-node {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 10px rgba(111, 230, 255, 0.08), 0 0 24px rgba(111, 230, 255, 0.38);
}
.node-a { top: 18%; left: 28%; }
.node-b { top: 28%; left: 58%; }
.node-c { top: 46%; left: 40%; }
.node-d { top: 62%; left: 68%; }
.node-e { top: 74%; left: 34%; }
.signal-hero-visual::after {
  content: "";
  position: absolute;
  inset: 18% 18%;
  background:
    linear-gradient(120deg, transparent 20%, rgba(111,230,255,0.16) 21%, transparent 22%) 0 0 / 100% 80%,
    linear-gradient(45deg, transparent 40%, rgba(139,169,255,0.14) 41%, transparent 42%) 0 0 / 100% 100%;
}
.signal-visual-copy {
  position: absolute;
  left: 38px;
  right: 38px;
  bottom: 34px;
  padding: 22px;
  border-radius: 22px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
}
.signal-visual-copy span,
.signal-visual-copy small {
  display: block;
}
.signal-visual-copy span {
  color: var(--cyan);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.signal-visual-copy strong {
  display: block;
  margin-top: 10px;
  font-size: 30px;
  line-height: 1.08;
}
.signal-visual-copy small {
  margin-top: 8px;
  color: var(--muted);
}
.signal-section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}
.signal-section-head p { margin: 0; color: var(--muted-2); }
.signal-section-head.compact { display: block; }
.signal-section-head.compact p { margin-top: 10px; }
.signal-showcase-row { margin-bottom: 28px; }
.signal-post-grid {
  display: grid;
  gap: 22px;
  grid-template-columns: repeat(12, minmax(0, 1fr));
}
.signal-post-card {
  min-width: 0;
  grid-column: span 4;
  overflow: hidden;
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.signal-post-card.feature-xl { grid-column: span 8; }
.signal-post-card:hover {
  transform: translateY(-2px);
  border-color: var(--line-strong);
  box-shadow: 0 28px 90px rgba(0,0,0,0.46);
}
.signal-post-card-link {
  display: block;
  min-height: 100%;
}
.signal-post-thumb-wrap {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
}
.signal-post-card.feature-xl .signal-post-thumb-wrap { aspect-ratio: 16 / 8; }
.signal-post-thumb {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.01);
}
.signal-post-copy { padding: 26px; }
.signal-post-card.feature-xl .signal-post-copy { padding: 32px; }
.signal-post-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px 12px;
  color: var(--muted-2);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.signal-post-card h2,
.signal-article-title {
  margin: 18px 0 14px;
  line-height: 1.04;
  letter-spacing: -0.04em;
}
.signal-post-card h2 { font-size: clamp(28px, 3vw, 42px); }
.signal-post-card p,
.signal-article-summary,
.signal-mini-item .date,
.signal-action-list a,
.signal-comment-content,
.signal-article-content,
.signal-comments h2 + p { color: var(--muted); }
.signal-post-footer {
  margin-top: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--cyan);
}
.signal-arrow { font-size: 18px; }
.accent-cyan { box-shadow: inset 0 1px 0 rgba(111,230,255,0.08), var(--shadow); }
.accent-violet { box-shadow: inset 0 1px 0 rgba(168,140,255,0.1), var(--shadow); }
.accent-emerald { box-shadow: inset 0 1px 0 rgba(101,241,203,0.1), var(--shadow); }
.signal-lower-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
  margin-bottom: 28px;
}
.signal-column-panel { padding: 24px; }
.signal-mini-list,
.signal-action-list,
.signal-comment-list { display: grid; gap: 14px; }
.signal-mini-item,
.signal-action-list a,
.signal-comment-item {
  padding: 16px 18px;
  border-radius: 18px;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
}
.signal-mini-item strong {
  display: block;
  margin-top: 8px;
  font-size: 18px;
  line-height: 1.3;
}
.signal-tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.signal-tag-cloud a {
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  color: var(--text);
}
.signal-pagination .page-nav {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}
.signal-pagination .page-nav a,
.signal-pagination .page-nav span {
  min-width: 42px;
  min-height: 42px;
  padding: 0 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
}
.signal-article-layout {
  padding: 36px 0 52px;
  display: grid;
  gap: 24px;
}
.signal-article-panel {
  width: min(960px, 100%);
  margin: 0 auto;
  padding: 34px;
}
.signal-article-title { font-size: clamp(40px, 5vw, 66px); }
.signal-article-summary {
  max-width: 48rem;
  font-size: 20px;
}
.signal-article-author,
.signal-article-tags,
.signal-comment-head time,
.signal-login-status { color: var(--muted-2); }
.signal-article-cover {
  margin: 28px 0 12px;
  border-radius: 26px;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.08);
  background: var(--panel-strong);
}
.signal-article-cover img {
  width: 100%;
  aspect-ratio: 16 / 8;
  object-fit: cover;
}
.signal-article-content {
  margin-top: 28px;
  font-size: 18px;
}
.signal-article-content h2,
.signal-article-content h3,
.signal-article-content h4 {
  margin: 1.4em 0 .6em;
  line-height: 1.15;
}
.signal-article-content p,
.signal-article-content ul,
.signal-article-content ol,
.signal-article-content blockquote,
.signal-article-content pre { margin: 0 0 1.1em; }
.signal-article-content a { color: var(--cyan); }
.signal-article-content blockquote {
  padding: 18px 20px;
  border-left: 3px solid var(--cyan);
  background: rgba(255,255,255,0.03);
  border-radius: 0 18px 18px 0;
}
.signal-article-content pre,
.signal-article-content code { font-family: "SFMono-Regular", Menlo, Consolas, monospace; }
.signal-article-content pre {
  padding: 16px;
  overflow: auto;
  border-radius: 18px;
  background: rgba(0,0,0,0.22);
  border: 1px solid rgba(255,255,255,0.06);
}
.signal-article-content code {
  padding: 2px 7px;
  border-radius: 8px;
  background: rgba(255,255,255,0.06);
}
.signal-article-nav {
  margin-top: 30px;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.08);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}
.signal-comments {
  width: min(960px, 100%);
  margin: 0 auto;
  padding: 30px;
}
.signal-comments h2 {
  margin: 0 0 18px;
  font-size: 28px;
}
.signal-comment-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}
.signal-respond { margin-top: 28px; }
.signal-comment-form { display: grid; gap: 16px; }
.signal-form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}
.signal-comment-form label span {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
}
.signal-comment-form input,
.signal-comment-form textarea {
  width: 100%;
  padding: 14px 16px;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.04);
  color: var(--text);
  font: inherit;
}
.signal-comment-form textarea { resize: vertical; }
.signal-footer {
  border-top: 1px solid rgba(255,255,255,0.07);
  background: rgba(6,10,18,0.44);
}
.signal-footer-inner {
  min-height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted-2);
  font-size: 14px;
}
.signal-not-found .signal-article-summary { margin-bottom: 20px; }
@media (max-width: 1180px) {
  .signal-hero,
  .signal-lower-grid { grid-template-columns: 1fr; }
  .signal-post-card,
  .signal-post-card.feature-xl { grid-column: span 6; }
}
@media (max-width: 860px) {
  .signal-topbar-inner { padding: 14px 0; align-items: flex-start; flex-direction: column; }
  .signal-nav { width: 100%; overflow: auto; white-space: nowrap; }
  .signal-post-grid { grid-template-columns: 1fr; }
  .signal-post-card,
  .signal-post-card.feature-xl { grid-column: auto; }
  .signal-stats,
  .signal-form-grid,
  .signal-article-nav { grid-template-columns: 1fr; }
  .signal-hero-copy,
  .signal-column-panel,
  .signal-article-panel,
  .signal-comments { padding: 22px; }
  .signal-hero-visual { min-height: 380px; }
}
@media (max-width: 560px) {
  :root { --container: min(100vw - 16px, 100%); }
  .signal-brand-copy em { max-width: 220px; }
  .signal-hero-copy h1,
  .signal-article-title { font-size: 36px; }
  .signal-hero-copy p,
  .signal-article-summary,
  .signal-article-content { font-size: 16px; }
  .signal-footer-inner { flex-direction: column; justify-content: center; text-align: center; padding: 14px 0; }
}