:root {
  --primary: #ff7043;
  --primary-dark: #f4511e;
  --bg-light: #f7f8fc;
  --text-main: #333;
  --text-sub: #666;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
	"Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text-main);
  background-color: #ffffff;
  line-height: 1.6;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 16px;
}

/* 顶部导航 */
header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid #eee;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.nav-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  object-fit: contain;
}

.brand-name {
  font-size: 18px;
  font-weight: 700;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 14px;
}

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

.nav-links a:hover {
  color: var(--primary-dark);
}

.nav-download {
  padding: 6px 14px;
  border-radius: 20px;
  background: var(--primary);
  color: #fff;
  font-size: 13px;
  font-weight: 500;
}

.nav-download:hover {
  /*background: var(--primary-dark);*/
  color: #fff;
}

@media (max-width: 768px) {
  .nav-links span {
	display: none;
  }
}

/* 顶部 Hero 区 */
.hero {
  padding: 32px 0 40px;
  background: radial-gradient(circle at top left, #ffe0b2 0, #ffffff 40%, #fff3e0 100%);
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: 32px;
  align-items: center;
}

@media (max-width: 900px) {
  .hero-inner {
	grid-template-columns: 1fr;
  }
}

.hero-title {
  font-size: 30px;
  line-height: 1.3;
  margin: 0 0 12px;
  font-weight: 800;
}

.hero-subtitle {
  font-size: 14px;
  color: var(--text-sub);
  margin-bottom: 20px;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.badge {
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(255, 112, 67, 0.08);
  color: var(--primary-dark);
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 14px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border-radius: 999px;
  border: none;
  background: var(--primary);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

.btn-primary:hover {
  background: var(--primary-dark);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border-radius: 999px;
  border: 1px solid #ddd;
  background: #fff;
  font-size: 14px;
  color: var(--text-sub);
  cursor: pointer;
}

.btn-ghost:hover {
  border-color: #ccc;
}

.hero-note {
  font-size: 12px;
  color: #999;
}

.hero-platforms {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
  font-size: 11px;
  color: #999;
}

.hero-platforms span {
  padding: 2px 8px;
  border-radius: 999px;
  border: 1px solid #eee;
}

.hero-image {
  padding: 10px;
}

.hero-mock {
  border-radius: 20px;
  background: #ffffff;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.06);
  padding: 16px;
}

.hero-mock img {
  border-radius: 12px;
}

/* 下载区域（四个平台） */
.section {
  padding: 32px 0;
}

.section.gray {
  background-color: var(--bg-light);
}

.section-title {
  text-align: center;
  margin-bottom: 24px;
}

.section-title h2 {
  font-size: 22px;
  margin: 0 0 8px;
}

.section-title p {
  margin: 0;
  font-size: 13px;
  color: var(--text-sub);
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

@media (max-width: 900px) {
  .download-grid {
	grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 520px) {
  .download-grid {
	grid-template-columns: 1fr;
  }
}

.card-download {
  background: #ffffff;
  border-radius: 16px;
  padding: 14px 14px 16px;
  text-align: center;
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.04);
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.card-download:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.08);
}

.card-download-icon {
  width: 40px;
  height: 40px;
  margin: 0 auto 10px;
}

.card-download-title {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 4px;
}

.card-download-desc {
  font-size: 12px;
  color: var(--text-sub);
}

/* 产品优势 */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

@media (max-width: 900px) {
  .feature-grid {
	grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 600px) {
  .feature-grid {
	grid-template-columns: 1fr;
  }
}

.card-feature {
  border-radius: 16px;
  background: #ffffff;
  padding: 16px 16px 18px;
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.03);
}

.card-feature-title {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 6px;
}

.card-feature-text {
  font-size: 13px;
  color: var(--text-sub);
}

/* 为什么选择我们 */
.reason-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

@media (max-width: 900px) {
  .reason-grid {
	grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 600px) {
  .reason-grid {
	grid-template-columns: 1fr;
  }
}

.card-reason {
  border-radius: 16px;
  background: #ffffff;
  padding: 16px 16px 18px;
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.03);
}

.card-reason-title {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 6px;
}

.card-reason-text {
  font-size: 13px;
  color: var(--text-sub);
}

/* 底部固定按钮（移动优先） */
.bottom-bar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.88);
  padding: 8px 16px;
  z-index: 20;
}

.bottom-bar-inner {
  max-width: 520px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 10px;
}

.bottom-bar-text {
  flex: 1;
  font-size: 11px;
  color: #ccc;
}

.bottom-bar-btn {
  white-space: nowrap;
  padding: 8px 14px;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  text-align: center;
}

.bottom-bar-btn:hover {
  background: var(--primary-dark);
}

@media (min-width: 900px) {
  .bottom-bar-text {
	font-size: 12px;
  }
}

/* 页脚 */
footer {
  padding: 40px 16px 72px;
  background: #111827;
  color: #9ca3af;
  font-size: 12px;
}

.footer-inner {
  max-width: 1180px;
  margin: 0 auto;
}

.footer-top {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  justify-content: space-between;
  margin-bottom: 18px;
}

.footer-brand {
  max-width: 260px;
}

.footer-brand h3 {
  margin: 0 0 6px;
  font-size: 15px;
  color: #e5e7eb;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-links a {
  color: #9ca3af;
}

.footer-links a:hover {
  color: #e5e7eb;
}

details {
  margin-top: 10px;
  color: #9ca3af;
}

details summary {
  cursor: pointer;
  outline: none;
}

details a {
  color: #9ca3af;
}

details a:hover {
  color: #e5e7eb;
}