:root {
  --ink: #0d1b24;
  --text: #2f4550;
  --mute: #69818c;
  --line: #dbe9ef;
  --paper: #f5fafc;
  --white: #ffffff;
  --pri: #1d7c98;
  --pri-deep: #17647c;
  --accent: #ff9f43;
  --soft: #e4f3f8;
  --soft-2: #fff2e2;
}

/* 帧率仪表：环形刻度 + 顶部胶囊 + 左侧圆章 */
.hv-meter .hero-visual { min-height: 502px; }
.hv-meter .hero-visual::before {
  content: ""; position: absolute; width: min(330px, 76%); aspect-ratio: 1; border-radius: 50%;
  background: conic-gradient(from 205deg, #1d7c98 0 64%, #dceef5 64% 100%);
  -webkit-mask: radial-gradient(circle, transparent 61%, #000 62%);
  mask: radial-gradient(circle, transparent 61%, #000 62%);
  rotate: -14deg; opacity: .9;
}
.hv-meter .hero-visual::after {
  content: "稳定 60 帧"; position: absolute; right: 2%; top: 5%;
  padding: 8px 13px; border-radius: 999px; background: #fff; color: var(--pri-deep);
  border: 1px solid #dbe9ef; font-size: 12px; font-weight: 800;
  rotate: 2deg; box-shadow: 0 12px 26px rgba(13,45,58,.14);
}
.hv-meter .hero-glow { width: 72%; opacity: .4; }
.hv-meter .stage-phone {
  width: min(206px, 50%); justify-self: center; align-self: center; margin-top: 8px;
  padding: 7px; border-radius: 26px; background: #0f2430; border-color: rgba(29,124,152,.24);
  rotate: 0deg; animation: none; box-shadow: 0 26px 56px rgba(13,45,58,.3);
}
.hv-meter .stage-phone img { border-radius: 20px; }
.hv-meter .hero-badge {
  left: 4%; right: auto; top: 42%; width: 88px; height: 88px;
  border-radius: 50%; background: #fff; color: var(--pri-deep); border: 1px solid #dbe9ef;
  rotate: -6deg; box-shadow: 0 14px 30px rgba(13,45,58,.16);
}
.hv-meter .hero-badge strong { font-size: 26px; }
.hv-meter .hero-badge span { color: var(--mute); }
.hv-meter .hero-strip {
  left: 4%; right: 4%; bottom: 2%; justify-content: center; gap: 6px; padding: 7px 10px;
  border-radius: 999px; background: #fff; border: 1px solid #e0eef4;
  box-shadow: 0 12px 26px rgba(13,45,58,.12);
}
.hv-meter .hero-strip span:first-child { background: var(--pri); color: #fff; }
.fv-split .feature { min-height: 0; }

@media (max-width: 640px) {
  .hv-meter .hero-grid { grid-template-columns: 1fr; gap: 16px; }
  .hv-meter .hero-visual { min-height: 466px; }
  .hv-meter .hero-visual::before { width: 236px; }
  .hv-meter .hero-visual::after { right: 8px; top: 6px; font-size: 10px; padding: 6px 10px; }
  .hv-meter .stage-phone { width: min(172px, 52%); margin-top: 42px; }
  .hv-meter .hero-badge { display: grid; left: 8px; right: auto; top: auto; bottom: 84px; width: 58px; height: 58px; }
  .hv-meter .hero-badge strong { font-size: 18px; }
  .hv-meter .hero-strip { left: 8px; right: 8px; bottom: 6px; padding: 6px 8px; gap: 4px; }
  .hv-meter .hero-strip span { padding: 3px 7px; font-size: 10px; }
  .fv-split .features .wrap { grid-template-columns: 1fr; }
  .fv-split .feature-grid { grid-template-columns: 1fr; }
}