:root {
  --amber-50: #fff8ed;
  --amber-100: #fef3c7;
  --amber-200: #fde68a;
  --amber-300: #fcd34d;
  --amber-500: #f59e0b;
  --amber-600: #d97706;
  --amber-700: #b45309;
  --stone-50: #fafaf9;
  --stone-500: #78716c;
  --stone-600: #57534e;
  --stone-700: #44403c;
  --stone-900: #1c1917;
  --stone-950: #0c0a09;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Microsoft YaHei", "PingFang SC", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--stone-900);
  background: radial-gradient(circle at top left, #fde68a 0, #fff8ed 38%, #fff 100%);
}
a { color: inherit; text-decoration: none; }
.top-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(245, 158, 11, .22);
  background: rgba(255, 251, 235, .88);
  backdrop-filter: blur(18px);
}
.nav-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 12px 16px;
  display: flex;
  gap: 10px;
  overflow-x: auto;
}
.nav-inner a {
  white-space: nowrap;
  padding: 10px 16px;
  border-radius: 999px;
  border: 1px solid var(--amber-200);
  background: white;
  color: #78350f;
  font-size: 14px;
  font-weight: 700;
  box-shadow: 0 4px 16px rgba(120, 80, 20, .06);
}
main { overflow: hidden; }
.section, .hero {
  max-width: 1180px;
  margin: 0 auto;
  padding: 72px 16px;
}
.last-section { padding-bottom: 100px; }
.section-grid {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  align-items: center;
  gap: 48px;
  min-height: 640px;
}
.badge {
  display: inline-flex;
  align-items: center;
  padding: 10px 18px;
  border: 1px solid var(--amber-300);
  border-radius: 999px;
  background: white;
  color: #92400e;
  font-weight: 800;
  box-shadow: 0 4px 16px rgba(120, 80, 20, .08);
}
h1 {
  margin: 22px 0 0;
  font-size: clamp(38px, 5vw, 68px);
  line-height: 1.08;
  letter-spacing: -1.6px;
  color: var(--stone-950);
}
.lead {
  margin-top: 24px;
  max-width: 720px;
  color: var(--stone-700);
  font-size: 18px;
  line-height: 2;
}
.hero-actions {
  margin-top: 32px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}
.primary-btn, .secondary-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 24px;
  border-radius: 18px;
  font-weight: 900;
}
.primary-btn {
  background: var(--amber-500);
  color: white;
  box-shadow: 0 14px 32px rgba(245, 158, 11, .28);
}
.secondary-btn {
  background: white;
  color: #78350f;
  border: 1px solid var(--amber-300);
}
.card {
  position: relative;
  border: 1px solid rgba(245, 158, 11, .28);
  background: rgba(255, 255, 255, .92);
  border-radius: 30px;
  padding: 28px;
  box-shadow: 0 20px 70px rgba(81, 56, 22, .12);
}
.hero-card { overflow: hidden; }
.card-glow {
  position: absolute;
  right: -60px;
  top: -60px;
  width: 190px;
  height: 190px;
  border-radius: 999px;
  background: rgba(252, 211, 77, .6);
  filter: blur(42px);
}
.version-row {
  position: relative;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
}
.muted { margin: 0; color: var(--stone-500); font-weight: 700; }
.version-row h2 { margin: 6px 0 0; font-size: 28px; }
.bee-icon { font-size: 48px; }
.metric-grid {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 28px;
}
.metric-grid div {
  padding: 18px;
  border-radius: 22px;
  background: var(--amber-50);
}
.metric-grid strong { display: block; color: var(--amber-600); font-size: 34px; }
.metric-grid span { display: block; margin-top: 8px; font-weight: 900; }
.note {
  position: relative;
  margin: 26px 0 0;
  padding: 16px;
  border-radius: 20px;
  border: 1px solid var(--amber-200);
  background: white;
  color: var(--stone-600);
  line-height: 1.8;
}
.section-title { margin-bottom: 32px; }
.section-title span, .final-note span {
  display: block;
  margin-bottom: 10px;
  color: var(--amber-600);
  font-size: 14px;
  font-weight: 900;
  letter-spacing: .25em;
}
.section-title h2 {
  margin: 0;
  color: var(--stone-950);
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.2;
}
.section-title p {
  max-width: 800px;
  margin: 14px 0 0;
  color: var(--stone-600);
  line-height: 1.9;
}
.mind-layout { display: grid; grid-template-columns: .95fr 1.05fr; gap: 24px; }
.mind-buttons { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.mind-button {
  cursor: pointer;
  padding: 18px;
  border-radius: 22px;
  border: 1px solid var(--amber-200);
  background: white;
  text-align: left;
  transition: .2s ease;
}
.mind-button:hover, .mind-button.active { background: var(--amber-100); border-color: var(--amber-500); transform: translateY(-2px); }
.mind-button b { display: block; font-size: 18px; color: var(--stone-950); }
.mind-button small { color: var(--stone-500); font-weight: 700; }
.active-panel {
  min-height: 330px;
  background: linear-gradient(135deg, #fef3c7, #fff);
}
.active-panel .emoji { font-size: 48px; }
.active-panel h3 { margin: 14px 0 20px; font-size: 34px; }
.active-points { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.active-points span {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px;
  border-radius: 18px;
  background: white;
  font-weight: 800;
}
.three-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.two-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.feature-card .feature-icon { font-size: 38px; }
.feature-card h3, .channel-card h3, .risk-card h3 { margin: 14px 0 10px; font-size: 25px; }
.feature-card p, .risk-card p { color: var(--stone-600); line-height: 1.85; }
ul { margin: 20px 0 0; padding: 0; list-style: none; }
li { margin: 10px 0; color: var(--stone-700); font-weight: 700; }
li::before, .checklist p::before { content: "✓"; margin-right: 10px; color: var(--amber-600); font-weight: 900; }
.channel-card strong { color: var(--amber-700); }
.channel-card div {
  margin-top: 18px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}
.channel-card span {
  display: block;
  padding: 14px;
  border-radius: 16px;
  background: var(--stone-50);
  color: var(--stone-700);
  font-weight: 700;
}
.steps { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; }
.steps div {
  padding: 20px;
  border-radius: 22px;
  background: var(--amber-50);
}
.steps b, .timeline-row b { color: var(--amber-600); }
.steps h3, .timeline-row h3 { margin: 12px 0; }
.steps p, .timeline-row p { margin: 0; color: var(--stone-600); line-height: 1.75; }
.timeline { display: grid; gap: 16px; }
.timeline-row {
  display: grid;
  grid-template-columns: 140px 180px 1fr;
  align-items: center;
  gap: 20px;
}
.checklist { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.checklist p {
  margin: 0;
  padding: 18px;
  border-radius: 18px;
  background: rgba(254, 243, 199, .62);
  color: var(--stone-700);
  font-weight: 700;
  line-height: 1.8;
}
.final-note {
  margin-top: 34px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 30px;
  padding: 36px;
  border-radius: 30px;
  background: var(--stone-950);
  color: white;
  box-shadow: 0 20px 70px rgba(81, 56, 22, .18);
}
.final-note h2 { margin: 0; font-size: 28px; }
.final-note p { color: #d6d3d1; line-height: 1.8; }
.final-note > div:last-child { font-size: 54px; }
.fade-up { animation: fadeUp .6s ease both; }
.delay { animation-delay: .12s; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(22px); } to { opacity: 1; transform: translateY(0); } }
@media (max-width: 900px) {
  .section-grid, .mind-layout, .three-grid, .two-grid, .steps, .checklist { grid-template-columns: 1fr; }
  .timeline-row { grid-template-columns: 1fr; }
  .hero { min-height: auto; padding-top: 56px; }
  .active-points, .channel-card div, .metric-grid, .mind-buttons { grid-template-columns: 1fr; }
  .section, .hero { padding: 54px 16px; }
}