:root {
  --bg: #0b1220;
  --bg-soft: #121d33;
  --card: #17253f;
  --text: #eaf0ff;
  --muted: #a8b6d7;
  --brand: #d11600;
  --brand-2: #ff4a2f;
  --line: #2a3a5d;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Inter", system-ui, -apple-system, sans-serif;
  background: linear-gradient(180deg, var(--bg), #0a1529 45%, #091426);
  color: var(--text);
}

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

.container {
  width: min(1120px, 92%);
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(8px);
  background: rgba(11, 18, 32, 0.82);
  border-bottom: 1px solid rgba(234, 240, 255, 0.08);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: 0.4px;
}

.logo-mark {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
}

.nav-links {
  display: flex;
  gap: 22px;
  font-size: 14px;
}

.nav-links a {
  color: var(--muted);
}

.nav-links a.active,
.nav-links a:hover {
  color: var(--text);
}

.btn {
  display: inline-block;
  padding: 12px 18px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 14px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: #fff;
}

.btn-ghost {
  border: 1px solid var(--line);
  color: var(--text);
}

.hero {
  padding: 72px 0 40px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 28px;
}

.hero h1 {
  font-size: clamp(32px, 4.2vw, 56px);
  line-height: 1.08;
  margin: 0 0 14px;
}

.hero p {
  color: var(--muted);
  margin: 0 0 22px;
  line-height: 1.7;
}

.hero-card,
.card {
  background: linear-gradient(180deg, rgba(23, 37, 63, 0.88), rgba(18, 29, 51, 0.92));
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  padding: 20px;
}

.hero-card img,
.banner img {
  width: 100%;
  border-radius: 12px;
  object-fit: cover;
}

.section {
  padding: 34px 0;
}

.section h2 {
  font-size: 30px;
  margin: 0 0 12px;
}

.section-desc {
  color: var(--muted);
  margin: 0 0 20px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.tag {
  display: inline-block;
  padding: 5px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 12px;
  color: #c8d5f1;
}

.kpi {
  font-size: 30px;
  font-weight: 700;
  color: #fff;
}

.list {
  margin: 10px 0 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.7;
}

.cta {
  margin: 26px 0 10px;
  padding: 26px;
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: linear-gradient(135deg, rgba(209, 22, 0, 0.2), rgba(255, 74, 47, 0.08));
}

.form {
  display: grid;
  gap: 12px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

input,
textarea,
select {
  width: 100%;
  border: 1px solid var(--line);
  background: #101a2f;
  color: var(--text);
  border-radius: 10px;
  padding: 12px;
  font-size: 14px;
}

textarea {
  min-height: 110px;
  resize: vertical;
}

.footer {
  margin-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 20px 0 30px;
  color: var(--muted);
  font-size: 13px;
}

.notice {
  display: none;
  padding: 10px 12px;
  border-radius: 10px;
  font-size: 14px;
}

.notice.ok {
  display: block;
  background: rgba(48, 180, 110, 0.18);
  border: 1px solid rgba(48, 180, 110, 0.4);
}

.notice.err {
  display: block;
  background: rgba(255, 74, 47, 0.18);
  border: 1px solid rgba(255, 74, 47, 0.5);
}

.lead-float {
  position: fixed;
  right: 16px;
  top: 88px;
  width: min(420px, calc(100vw - 24px));
  z-index: 40;
  transition: transform 0.25s ease;
}

.lead-panel {
  background: linear-gradient(180deg, rgba(23, 37, 63, 0.95), rgba(18, 29, 51, 0.97));
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 14px;
  padding: 16px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.35);
}

.lead-panel h3 {
  margin: 0 0 12px;
}

.lead-toggle {
  margin-left: auto;
  margin-bottom: 8px;
  display: inline-block;
  border: 1px solid var(--line);
  background: #0f1a31;
  color: var(--text);
  border-radius: 9px;
  padding: 8px 12px;
  cursor: pointer;
}

.lead-float.is-collapsed {
  transform: translateX(calc(100% - 110px));
}

.lead-float.is-collapsed .lead-panel {
  opacity: 0;
  pointer-events: none;
}

@media (max-width: 920px) {
  .hero-grid,
  .grid-3,
  .grid-2,
  .form-grid {
    grid-template-columns: 1fr;
  }

  .nav {
    flex-wrap: wrap;
    padding: 8px 0;
  }

  .nav-links {
    width: 100%;
    overflow-x: auto;
    padding-bottom: 8px;
  }

  .lead-float {
    right: 8px;
    left: 8px;
    width: auto;
    top: auto;
    bottom: 8px;
  }

  .lead-float.is-collapsed {
    transform: translateY(calc(100% - 46px));
  }
}