* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Microsoft YaHei", sans-serif;
  background: #f5f7fb;
  color: #1f2a37;
  line-height: 1.65;
}

.wrap {
  width: min(1100px, 92%);
  margin: 0 auto;
}

.site-header {
  background: #0f172a;
  color: #fff;
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
}

.brand-logo {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  object-fit: cover;
}

.nav-links a {
  color: #dbeafe;
  text-decoration: none;
  margin-left: 20px;
  font-size: 14px;
}

.hero {
  background: linear-gradient(135deg, #1d4ed8, #2563eb 60%, #3b82f6);
  color: #fff;
  padding: 72px 0;
}

.hero-content {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 24px;
  align-items: center;
}

.hero h1 {
  margin: 8px 0 14px;
  font-size: 38px;
  line-height: 1.3;
}

.tag {
  display: inline-block;
  margin: 0;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 13px;
  background: rgba(255, 255, 255, 0.2);
}

.hero-desc {
  max-width: 680px;
  color: #e0e7ff;
}

.hero-actions {
  display: flex;
  gap: 12px;
  margin-top: 22px;
}

.hero-card {
  background: rgba(15, 23, 42, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 14px;
  padding: 18px 20px;
}

.hero-card h3 {
  margin-top: 0;
}

.hero-card ul {
  margin: 0;
  padding-left: 18px;
}

.section {
  padding: 46px 0;
}

.section h2 {
  margin: 0 0 18px;
  font-size: 30px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 18px;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.05);
}

.card h3 {
  margin-top: 0;
}

.feature-card {
  position: relative;
  overflow: hidden;
  color: #fff;
  border: none;
  min-height: 200px;
  aspect-ratio: 16 / 9;
  background-color: #334155;
  background-image:
    linear-gradient(155deg, rgba(15, 23, 42, 0.2), rgba(15, 23, 42, 0.78)),
    var(--auto-bg, none);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.feature-card h3,
.feature-card p {
  position: relative;
  z-index: 1;
}

.feature-card p {
  color: rgba(255, 255, 255, 0.92);
}

.feature-points {
  position: relative;
  z-index: 1;
  margin: 10px 0 0;
  padding-left: 18px;
  color: rgba(255, 255, 255, 0.95);
  font-size: 14px;
}

.feature-points li {
  margin-bottom: 3px;
}

.feature-stats {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

.feature-stats span {
  font-size: 12px;
  padding: 3px 8px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.35);
  color: #fff;
}

.steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.step {
  background: #fff;
  border-radius: 10px;
  border: 1px solid #e5e7eb;
  padding: 14px;
  font-size: 14px;
}

.step span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #2563eb;
  color: #fff;
  font-size: 12px;
  margin-right: 6px;
}

.contact {
  margin-bottom: 46px;
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 14px;
  padding: 22px;
}

.download-box {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 28px 40px;
  margin-top: 18px;
  padding-top: 8px;
}

.download-qr-wrap {
  text-align: center;
}

.download-qr {
  display: block;
  width: 220px;
  height: 220px;
  border-radius: 12px;
  border: 1px solid #e5e7eb;
  background: #f9fafb;
  object-fit: contain;
}

.download-qr-tip {
  margin: 10px 0 0;
  font-size: 14px;
  color: #4b5563;
}

.download-actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.cooperation-form {
  display: grid;
  gap: 8px;
  max-width: 620px;
}

.cooperation-form input,
.cooperation-form textarea {
  border: 1px solid #d1d5db;
  border-radius: 8px;
  padding: 10px 12px;
  font: inherit;
}

.cooperation-status {
  min-height: 24px;
  margin: 2px 0 0;
  color: #1d4ed8;
}

.modal-mask {
  position: fixed;
  inset: 0;
  background: rgba(2, 6, 23, 0.56);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 16px;
  z-index: 1000;
}

.modal-mask.show {
  display: flex;
}

.modal-panel {
  width: min(680px, 96%);
  background: #fff;
  border-radius: 14px;
  padding: 20px;
  position: relative;
}

.modal-close {
  position: absolute;
  right: 12px;
  top: 8px;
  border: none;
  background: transparent;
  font-size: 24px;
  cursor: pointer;
  color: #6b7280;
}

.btn {
  display: inline-block;
  text-decoration: none;
  padding: 10px 16px;
  border-radius: 8px;
  background: #2563eb;
  color: #fff;
  border: 1px solid transparent;
}

.btn:hover {
  opacity: 0.92;
}

.btn-secondary {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.5);
}

.container {
  max-width: 760px;
  margin: 60px auto;
  background: #fff;
  border-radius: 12px;
  padding: 28px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.privacy-card {
  margin-top: 12px;
  padding: 16px;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  background: #fafafa;
}

.brand-footer {
  background: linear-gradient(180deg, #0f172a, #020617);
  color: #cbd5e1;
  padding: 56px 0 26px;
}

.brand-footer h2 {
  color: #fff;
  margin: 0 0 14px;
}

.footer-block {
  margin-bottom: 34px;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.footer-card {
  background: rgba(30, 41, 59, 0.72);
  border: 1px solid rgba(148, 163, 184, 0.28);
  border-radius: 12px;
  padding: 16px;
}

.footer-card h3 {
  color: #f8fafc;
  margin-top: 0;
}

.footer-bottom {
  border-top: 1px solid rgba(148, 163, 184, 0.22);
  padding-top: 18px;
  font-size: 13px;
  color: #94a3b8;
}

.footer-bottom a {
  color: #93c5fd;
}

.floating-cooperation-btn {
  position: fixed;
  right: 18px;
  top: 50%;
  transform: translateY(-50%) scale(1);
  border: none;
  border-radius: 999px;
  padding: 9px 14px 9px 10px;
  background: #f59e0b;
  color: #111827;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.2);
  z-index: 999;
  animation: floating-breath 2.6s ease-in-out infinite;
}

.floating-btn-icon {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  object-fit: cover;
}

@keyframes floating-breath {
  0%,
  100% {
    transform: translateY(-50%) scale(1);
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.2);
  }
  50% {
    transform: translateY(-50%) scale(1.04);
    box-shadow: 0 14px 28px rgba(245, 158, 11, 0.32);
  }
}

@media (max-width: 900px) {
  .hero-content,
  .grid,
  .grid-3,
  .steps,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .nav {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .nav-links a {
    margin: 0 14px 0 0;
  }

  .hero h1 {
    font-size: 30px;
  }

  .floating-cooperation-btn {
    right: 12px;
    top: auto;
    bottom: 18px;
    transform: scale(1);
    padding: 10px 12px;
    font-size: 13px;
  }

  @keyframes floating-breath {
    0%,
    100% {
      transform: scale(1);
    }
    50% {
      transform: scale(1.04);
    }
  }
}