:root {
  --bg: #07070b;
  --panel: #0f1016;
  --panel-2: #141625;
  --text: #f5f7ff;
  --muted: #9aa3b2;
  --neon: #00f5ff;
  --neon-2: #7c4dff;
  --line: rgba(255,255,255,0.08);
  --glow: 0 0 24px rgba(0,245,255,0.35);
}

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

body {
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  background: radial-gradient(circle at 20% 10%, #101323 0%, #07070b 45%, #050509 100%);
  color: var(--text);
  line-height: 1.7;
}

.scrollbar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--neon), var(--neon-2));
  box-shadow: var(--glow);
  z-index: 100;
}

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

img {
  max-width: 100%;
  display: block;
}

.skyline {
  padding: 22px 20px 48px;
  background: linear-gradient(120deg, rgba(0,245,255,0.12), transparent 55%),
    radial-gradient(circle at 80% 0%, rgba(124,77,255,0.18), transparent 55%);
  position: relative;
}

.navline {
  position: sticky;
  top: 14px;
  z-index: 20;
  background: rgba(8,9,14,0.75);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 10px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  backdrop-filter: blur(14px);
}

.brandmark {
  display: flex;
  align-items: center;
  gap: 10px;
}

.pulse-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--neon);
  box-shadow: var(--glow);
}

.brand-title {
  font-weight: 600;
  letter-spacing: 0.5px;
}

.topnav {
  display: none;
  gap: 16px;
  font-size: 14px;
  color: var(--muted);
}

.topnav a:hover {
  color: var(--text);
}

.topnav a.active {
  color: var(--text);
  text-shadow: var(--glow);
}

.topnav.open {
  display: flex;
  flex-direction: column;
  position: absolute;
  right: 18px;
  top: 60px;
  background: rgba(8,9,14,0.95);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px;
  gap: 10px;
  z-index: 25;
}

.nav-toggle {
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 8px;
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
}

.nav-toggle span {
  width: 18px;
  height: 2px;
  background: var(--text);
}

.hero-panel {
  margin-top: 24px;
  display: grid;
  gap: 20px;
}

.hero-left h1 {
  font-size: 32px;
  margin: 10px 0 12px;
}

.hero-tag {
  color: var(--neon);
  font-weight: 600;
  letter-spacing: 1px;
}

.hero-text {
  color: var(--muted);
  margin-bottom: 14px;
}

.hero-list {
  list-style: none;
  display: grid;
  gap: 8px;
  color: var(--text);
}

.hero-list li {
  padding: 8px 12px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--line);
  border-radius: 12px;
}

.hero-right {
  display: grid;
  gap: 16px;
}

.hero-visual {
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: 0 18px 40px rgba(0,0,0,0.45);
}

.metric-grid {
  display: grid;
  gap: 12px;
}

.metric {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px;
}

.metric h3 {
  font-size: 16px;
  color: var(--neon);
  margin-bottom: 4px;
}

.toc-float {
  position: fixed;
  right: 14px;
  top: 40%;
  transform: translateY(-50%);
  display: none;
  flex-direction: column;
  gap: 8px;
  background: rgba(8,9,14,0.85);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 10px;
  z-index: 30;
}

.toc-link {
  font-size: 12px;
  color: var(--muted);
  padding: 6px 8px;
  border-radius: 8px;
}

.toc-link.active {
  color: var(--text);
  background: rgba(0,245,255,0.18);
  box-shadow: var(--glow);
}

.page-body {
  padding: 24px 18px 60px;
}

.slice {
  margin: 40px 0;
  padding: 28px 18px;
  border-radius: 18px;
  background: rgba(12,13,20,0.9);
  border: 1px solid var(--line);
}

.section-head h2 {
  font-size: 24px;
  margin-bottom: 10px;
}

.section-head p {
  color: var(--muted);
}

.divider {
  margin-top: 26px;
}

.neon-cut {
  height: 6px;
  background: linear-gradient(90deg, var(--neon), transparent, var(--neon-2));
  border-radius: 999px;
}

.angled-split {
  height: 18px;
  background: linear-gradient(135deg, rgba(0,245,255,0.3) 0%, rgba(124,77,255,0.2) 50%, transparent 100%);
  border-radius: 12px;
}

.gradient-bar {
  height: 12px;
  background: linear-gradient(90deg, rgba(124,77,255,0.5), rgba(0,245,255,0.4));
  border-radius: 999px;
}

.model-grid {
  display: grid;
  gap: 16px;
  margin-top: 18px;
}

.model-card {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
  display: grid;
  transition: transform 0.35s ease, box-shadow 0.35s ease;
}

.model-media img {
  width: 100%;
  height: auto;
}

.model-info {
  padding: 16px;
  color: var(--muted);
}

.model-info h3 {
  color: var(--text);
  margin-bottom: 8px;
}

.scoreboard {
  margin-top: 18px;
  display: grid;
  gap: 10px;
}

.score-row {
  display: grid;
  grid-template-columns: 88px 1fr 90px;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--muted);
}

.bar {
  height: 8px;
  background: rgba(255,255,255,0.08);
  border-radius: 999px;
  overflow: hidden;
}

.bar i {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--neon), var(--neon-2));
}

.timeline {
  display: grid;
  gap: 16px;
  margin-top: 16px;
}

.step-block {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 12px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px;
}

.step-num {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: rgba(0,245,255,0.18);
  color: var(--text);
  font-weight: 600;
}

.image-band, .image-strip {
  margin-top: 18px;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--line);
}

.warning-banner {
  margin: 16px 0 12px;
  padding: 12px 14px;
  border: 1px solid rgba(255,77,77,0.4);
  background: rgba(255,77,77,0.1);
  border-radius: 12px;
}

.checklist {
  display: grid;
  gap: 10px;
  margin-top: 12px;
}

.check-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px 12px;
  color: var(--muted);
  transition: transform 0.35s ease, box-shadow 0.35s ease;
}

.tri-grid {
  display: grid;
  gap: 16px;
  margin-top: 16px;
}

.tri-card {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px;
  color: var(--muted);
  transition: transform 0.35s ease, box-shadow 0.35s ease;
}

.tri-card h3 {
  color: var(--text);
  margin-bottom: 8px;
}

.update-list {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.update-item {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px 12px;
  color: var(--muted);
  transition: transform 0.35s ease, box-shadow 0.35s ease;
}

.accordion {
  display: grid;
  gap: 10px;
  margin-top: 12px;
}

.qa-item {
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  background: rgba(255,255,255,0.03);
  transition: transform 0.35s ease, box-shadow 0.35s ease;
}

.lift:hover {
  transform: translateY(-6px);
  box-shadow: 0 18px 40px rgba(0,0,0,0.4);
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: all 0.6s ease;
}

.reveal.in-view {
  opacity: 1;
  transform: translateY(0);
}

.qa-title {
  width: 100%;
  text-align: left;
  padding: 12px 14px;
  background: transparent;
  border: none;
  color: var(--text);
  font-size: 15px;
  cursor: pointer;
}

.qa-body {
  display: none;
  padding: 0 14px 14px;
  color: var(--muted);
}

.qa-item.open .qa-body {
  display: block;
}

.footer-area {
  padding: 32px 18px 24px;
  border-top: 1px solid var(--line);
  background: #050509;
}

.footer-inner {
  display: grid;
  gap: 16px;
}

.footer-inner a {
  display: block;
  color: var(--muted);
  margin-bottom: 6px;
}

.footer-bottom {
  text-align: center;
  color: var(--muted);
  margin-top: 18px;
  font-size: 12px;
}

@media (min-width: 768px) {
  .topnav { display: flex; }
  .nav-toggle { display: none; }
  .hero-panel { grid-template-columns: 1.1fr 0.9fr; align-items: center; }
  .model-grid { grid-template-columns: repeat(3, 1fr); }
  .tri-grid { grid-template-columns: repeat(3, 1fr); }
  .toc-float { display: flex; }
  .page-body { padding: 30px 70px 80px; }
  .footer-inner { grid-template-columns: repeat(3, 1fr); }
}

@media (min-width: 1200px) {
  .hero-left h1 { font-size: 44px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}