:root {
  --bg: #1c1917;
  --paper: #2a2118;
  --card: #3b2c1c;
  --ink: #fff7ed;
  --muted: #e7c9a3;
  --amber: #f59e0b;
  --amber-deep: #b45309;
  --amber-soft: #fde68a;
  --line: #92400e;
  --cool: #44c7a0;
  --hot: #ef4444;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: auto; }
body {
  font-family: "Avenir Next", "PingFang SC", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at 12% -10%, rgba(245,158,11,0.22), transparent 36%),
    radial-gradient(circle at 90% 8%, rgba(180,83,9,0.18), transparent 32%),
    var(--bg);
  color: var(--ink);
  line-height: 1.8;
}

.top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 32px;
  border-bottom: 1px solid rgba(245,158,11,0.28);
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
}
.menu { display: flex; gap: 16px; flex-wrap: wrap; }
.menu a {
  color: var(--amber-soft);
  text-decoration: none;
  font-size: 14px;
}
.menu a:hover { color: #fff; }

.billboard {
  padding: 40px 32px 28px;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 28px;
  align-items: center;
}
.billboard h1 {
  font-size: 32px;
  line-height: 1.3;
  margin: 8px 0 14px;
}
.kicker {
  color: var(--amber);
  font-size: 12px;
  letter-spacing: 0.14em;
  font-weight: 700;
}
.billboard p { color: var(--muted); max-width: 38em; }

.meters {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 18px 18px 16px;
  display: grid;
  gap: 16px;
}
.meter label {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  margin-bottom: 6px;
  color: var(--amber-soft);
}
.track {
  height: 14px;
  background: #1c140d;
  border: 1px solid #78350f;
  overflow: hidden;
}
.track b {
  display: block;
  height: 100%;
}
.battery b {
  width: 62%;
  background: linear-gradient(90deg, var(--amber-deep), var(--amber));
}
.temp b {
  width: 74%;
  background: linear-gradient(90deg, #f59e0b, #ef4444);
}
.pulse {
  font-size: 12px;
  color: var(--muted);
}

.wrap { padding: 8px 32px 56px; display: grid; gap: 28px; }
.sec h2 {
  font-size: 23px;
  line-height: 1.4;
  margin-bottom: 12px;
  color: var(--amber-soft);
}
.sec p { margin-bottom: 12px; color: #ffe8c7; }

.costs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin: 16px 0 8px;
}
.cost {
  background: var(--card);
  border: 1px solid var(--line);
  padding: 16px 16px 14px;
}
.cost strong {
  display: block;
  font-size: 28px;
  color: var(--amber);
  line-height: 1.1;
  margin: 6px 0 8px;
}
.cost h3 { font-size: 15px; margin-bottom: 4px; }
.cost p { color: var(--muted); font-size: 14px; margin: 0; }

.curve {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 8px 14px;
  align-items: center;
  margin: 16px 0;
}
.curve .lab { font-size: 12px; color: var(--amber-soft); }
.bar {
  height: 22px;
  background: repeating-linear-gradient(
    90deg,
    rgba(245,158,11,0.15) 0 8px,
    transparent 8px 16px
  );
  border: 1px solid #78350f;
}
.bar i {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, #b45309, #fbbf24);
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.panel {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 16px 18px;
}
.panel h3 { color: var(--amber); font-size: 16px; margin-bottom: 8px; }

.faq-wrap {
  background: #22180f;
  border-top: 1px solid var(--line);
  padding: 32px;
}
.faq-wrap h2 { margin-bottom: 14px; color: var(--amber-soft); font-size: 23px; }
.faq-card {
  border: 1px solid #78350f;
  background: #2c2014;
  padding: 14px 16px;
  margin-bottom: 10px;
}
.faq-card h3 { font-size: 16px; margin-bottom: 6px; color: #fde68a; }
.faq-card p { color: #ffe8c7; }

footer {
  padding: 20px 32px 28px;
  border-top: 1px solid rgba(245,158,11,0.25);
  color: #e7c9a3;
  font-size: 13px;
  display: grid;
  gap: 6px;
}

@media (max-width: 900px) {
  .billboard, .costs, .split { grid-template-columns: 1fr; }
  .billboard h1 { font-size: 26px; }
}