:root {
  --blue: #1769ff;
  --blue-dark: #0b49d8;
  --blue-soft: #eaf2ff;
  --cyan: #20c6ff;
  --ink: #111827;
  --text: #334155;
  --muted: #64748b;
  --line: #e3ebf6;
  --page: #f4f8ff;
  --card: #ffffff;
  --shadow: 0 22px 55px rgba(15, 76, 180, 0.18);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-text-size-adjust: 100%;
}

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

img {
  max-width: 100%;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 18px;
  min-height: 68px;
  padding: 0 clamp(18px, 6vw, 86px);
  background: rgba(16, 92, 235, 0.92);
  color: #fff;
  backdrop-filter: blur(14px);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.14);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  font-size: 18px;
  font-weight: 900;
  white-space: nowrap;
}

.brand-logo {
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 8px 18px rgba(8, 43, 130, 0.18);
}

.brand-logo img {
  display: block;
  width: 100%;
  height: 100%;
}

.site-nav {
  display: flex;
  gap: 28px;
  margin-left: clamp(14px, 4vw, 54px);
  color: rgba(255, 255, 255, 0.86);
  font-size: 14px;
  min-width: 0;
  flex: 1;
  justify-content: flex-start;
}

.site-nav a:hover {
  color: #fff;
}

.nav-download {
  margin-left: auto;
  flex: 0 0 auto;
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
  border-radius: 999px;
  background: #fff;
  color: var(--blue);
  font-weight: 900;
  font-size: 14px;
}

.disabled-link {
  cursor: not-allowed;
  opacity: 0.72;
}

.hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at 18% 14%, rgba(83, 202, 255, 0.34), transparent 28%),
    radial-gradient(circle at 82% 18%, rgba(255, 255, 255, 0.22), transparent 26%),
    linear-gradient(135deg, #0f66ff 0%, #0753e3 52%, #0438b5 100%);
  color: #fff;
}

.hero::after {
  content: "";
  position: absolute;
  left: -10%;
  right: -10%;
  bottom: -1px;
  height: 94px;
  background: var(--page);
  clip-path: ellipse(62% 72% at 50% 100%);
}

.hero-inner {
  position: relative;
  z-index: 2;
  width: min(1220px, calc(100% - 36px));
  min-height: min(690px, calc(100vh - 68px));
  min-height: min(690px, calc(100svh - 68px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 0.88fr) minmax(0, 1.12fr);
  gap: 48px;
  align-items: center;
  padding: 74px 0 132px;
}

.eyebrow,
.section-kicker {
  margin: 0 0 12px;
  color: #bfe4ff;
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 18px;
  font-size: clamp(44px, 7vw, 84px);
  line-height: 0.98;
  letter-spacing: 0;
}

.subtitle {
  max-width: 560px;
  margin-bottom: 0;
  color: rgba(255, 255, 255, 0.86);
  font-size: clamp(17px, 2vw, 20px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.primary-btn,
.outline-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 24px;
  border-radius: 999px;
  font-weight: 900;
}

.primary-btn {
  background: #fff;
  color: var(--blue);
  box-shadow: 0 16px 34px rgba(3, 31, 98, 0.2);
}

.primary-btn.light {
  background: #fff;
  color: var(--blue);
}

.outline-btn {
  border: 1px solid rgba(255, 255, 255, 0.46);
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.hero-tags span {
  padding: 7px 11px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.88);
  font-size: 13px;
}

.hero-preview {
  overflow: hidden;
  justify-self: end;
  width: min(760px, 100%);
  max-width: 100%;
  border: 10px solid rgba(255, 255, 255, 0.94);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 24px 58px rgba(3, 31, 98, 0.2);
  transform: none;
}

.hero-preview picture,
.hero-preview img {
  display: block;
  width: 100%;
}

.hero-preview picture {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: 8px;
  background: #f8fafc;
}

.hero-preview img {
  height: 100%;
  object-fit: contain;
  object-position: center;
}

.blue-stats {
  position: relative;
  z-index: 4;
  width: min(1080px, calc(100% - 36px));
  margin: -82px auto 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  overflow: hidden;
  border-radius: 18px;
  background: #fff;
  box-shadow: 0 18px 42px rgba(15, 76, 180, 0.12);
}

.blue-stats div {
  min-height: 118px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  border-right: 1px solid var(--line);
}

.blue-stats div:last-child {
  border-right: 0;
}

.blue-stats strong {
  color: var(--blue);
  font-size: 30px;
  line-height: 1.1;
}

.blue-stats span {
  margin-top: 8px;
  color: var(--muted);
  font-size: 14px;
}

.section,
.feature-grid,
.pricing-section,
.flow-section,
.download-card,
.faq-section {
  width: min(1180px, calc(100% - 36px));
  margin: 0 auto;
}

.section-title {
  padding: 92px 0 28px;
  text-align: center;
}

.section-title .section-kicker,
.flow-copy .section-kicker,
.download-card .section-kicker,
.faq-section .section-kicker {
  color: var(--blue);
}

.section-title h2,
.flow-copy h2,
.download-card h2,
.faq-section h2 {
  margin-bottom: 12px;
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.14;
  letter-spacing: 0;
}

.section-title p {
  max-width: 720px;
  margin: 0 auto;
  color: var(--muted);
  font-size: 17px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.feature-card {
  min-height: 244px;
  padding: clamp(20px, 2.3vw, 28px);
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
  box-shadow: 0 10px 28px rgba(15, 76, 180, 0.06);
}

.feature-card .icon {
  display: inline-grid;
  place-items: center;
  width: 46px;
  height: 46px;
  margin-bottom: 26px;
  border-radius: 14px;
  background: var(--blue-soft);
  color: var(--blue);
  font-weight: 900;
}

.feature-card h3 {
  margin-bottom: 10px;
  font-size: 22px;
}

.feature-card p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 15px;
}

.feature-card-more {
  display: inline-flex;
  margin-top: 18px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 900;
}

.feature-card-more:hover {
  color: var(--blue-dark);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.pricing-section {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(260px, 0.75fr);
  gap: 44px;
  align-items: center;
  padding: 96px 0 24px;
}

.pricing-copy h2 {
  margin-bottom: 12px;
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.14;
}

.pricing-copy > p:not(.section-kicker) {
  max-width: 650px;
  color: var(--muted);
  font-size: 17px;
}

.pricing-copy ul {
  display: grid;
  gap: 10px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  color: var(--text);
}

.pricing-copy li::before {
  content: "✓";
  margin-right: 10px;
  color: #15803d;
  font-weight: 900;
}

.pricing-offer {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
  box-shadow: 0 10px 28px rgba(15, 76, 180, 0.08);
}

.pricing-offer > span {
  color: var(--blue);
  font-size: 14px;
  font-weight: 900;
}

.pricing-offer strong {
  display: block;
  margin: 8px 0 0;
  color: var(--ink);
  font-size: 54px;
  line-height: 1;
}

.pricing-offer strong small {
  margin-right: 4px;
  font-size: 24px;
}

.pricing-offer b {
  display: block;
  margin-top: 10px;
  color: var(--text);
  font-size: 18px;
}

.pricing-offer p {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.flow-section {
  display: grid;
  grid-template-columns: minmax(320px, 0.82fr) minmax(420px, 1.18fr);
  gap: 44px;
  align-items: center;
  padding: 96px 0;
}

.flow-copy p {
  color: var(--muted);
  font-size: 17px;
}

.flow-list {
  display: grid;
  gap: 14px;
}

.flow-item {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 16px;
  align-items: center;
  min-height: 104px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
}

.flow-item span {
  display: inline-grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 14px;
  background: linear-gradient(135deg, #1769ff, #20c6ff);
  color: #fff;
  font-weight: 900;
}

.flow-item h3 {
  margin-bottom: 2px;
  font-size: 19px;
}

.flow-item p {
  margin-bottom: 0;
  color: var(--muted);
}

.download-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 34px;
  padding: clamp(26px, 4vw, 42px);
  border-radius: 22px;
  background: linear-gradient(135deg, #1769ff, #0b49d8);
  color: #fff;
  box-shadow: var(--shadow);
}

.download-card p {
  margin-bottom: 0;
  color: rgba(255, 255, 255, 0.84);
}

.faq-section {
  padding: 92px 0 76px;
}

.faq-section > h2,
.faq-section > .section-kicker {
  text-align: center;
}

.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 32px;
}

.faq-grid article {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
}

.faq-grid h3 {
  margin-bottom: 8px;
  font-size: 18px;
}

.faq-grid p {
  margin-bottom: 0;
  color: var(--muted);
}

.site-footer {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px 32px;
  padding: 26px clamp(18px, 6vw, 86px);
  color: #dbeafe;
  background: #0b49d8;
  font-size: 14px;
}

.site-footer-main,
.site-footer-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 20px;
}

.site-footer-main {
  gap: 20px;
}

.site-footer-links {
  justify-content: flex-end;
}

.site-footer-links a:hover {
  color: #fff;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.site-disclaimer {
  grid-column: 1 / -1;
  margin: 2px 0 0;
  color: rgba(219, 234, 254, 0.76);
  font-size: 12px;
  line-height: 1.6;
}

/* SEO专题页 */
.seo-page {
  background: var(--page);
}

.seo-hero {
  background: #0d56dd;
  color: #fff;
}

.seo-hero-inner,
.seo-section,
.seo-cta,
.seo-related {
  width: min(1180px, calc(100% - 36px));
  margin: 0 auto;
}

.seo-hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 52px;
  align-items: center;
  min-height: 500px;
  padding: 76px 0 88px;
}

.seo-hero .eyebrow {
  color: #bfdbfe;
}

.seo-hero h1 {
  max-width: 650px;
  margin-bottom: 18px;
  font-size: clamp(38px, 5.4vw, 66px);
  line-height: 1.08;
}

.seo-hero-copy > p:not(.eyebrow) {
  max-width: 600px;
  margin-bottom: 0;
  color: rgba(255, 255, 255, 0.86);
  font-size: 18px;
}

.seo-hero-points {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.seo-hero-points li {
  padding: 7px 11px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.9);
  font-size: 13px;
}

.seo-hero-preview {
  overflow: hidden;
  border: 8px solid rgba(255, 255, 255, 0.94);
  border-radius: 14px;
  background: #fff;
  box-shadow: 0 24px 54px rgba(3, 31, 98, 0.2);
}

.seo-hero-preview img {
  display: block;
  width: 100%;
  height: auto;
}

.seo-section {
  padding: 84px 0 26px;
}

.seo-section-header {
  max-width: 760px;
  margin: 0 auto 30px;
  text-align: center;
}

.seo-section-header .section-kicker {
  color: var(--blue);
}

.seo-section-header h2,
.seo-related h2 {
  margin-bottom: 12px;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.18;
}

.seo-section-header p,
.seo-section > p {
  color: var(--muted);
  font-size: 16px;
}

.seo-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.seo-card {
  min-height: 190px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  box-shadow: 0 10px 28px rgba(15, 76, 180, 0.06);
}

.seo-card h3 {
  margin-bottom: 9px;
  font-size: 19px;
}

.seo-card p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 14px;
}

.seo-process {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-top: 28px;
}

.seo-process-item {
  padding: 20px;
  border-top: 3px solid var(--blue);
  background: #fff;
}

.seo-process-item span {
  display: block;
  margin-bottom: 10px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 900;
}

.seo-process-item h3 {
  margin-bottom: 6px;
  font-size: 17px;
}

.seo-process-item p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 14px;
}

.seo-note {
  margin: 28px auto 0;
  padding: 18px 20px;
  border-left: 3px solid #60a5fa;
  background: #eaf2ff;
  color: #475569;
  font-size: 14px;
}

.seo-note strong {
  color: #1d4ed8;
}

.seo-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-top: 58px;
  padding: 30px clamp(24px, 4vw, 44px);
  border-radius: 16px;
  background: #0d56dd;
  color: #fff;
  box-shadow: var(--shadow);
}

.seo-cta h2 {
  margin-bottom: 6px;
  font-size: 26px;
}

.seo-cta p {
  margin: 0;
  color: rgba(255, 255, 255, 0.82);
  font-size: 14px;
}

.seo-related {
  padding: 70px 0 82px;
}

.seo-related h2 {
  text-align: center;
}

.seo-related-links {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-top: 24px;
}

.seo-related-links a {
  padding: 15px 16px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--blue);
  font-size: 14px;
  font-weight: 800;
  text-align: center;
}

.seo-related-links a:hover {
  border-color: #93c5fd;
  background: var(--blue-soft);
}

@media (max-width: 1050px) {
  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 960px) {
  .hero-inner,
  .pricing-section,
  .flow-section {
    grid-template-columns: 1fr;
  }

  .hero-inner {
    min-height: auto;
    gap: 34px;
    padding-top: 56px;
  }

  .hero-preview {
    transform: none;
    justify-self: center;
    width: min(860px, 100%);
  }
}

@media (max-width: 820px) {
  .site-header {
    gap: 12px;
  }

  .site-nav {
    display: none;
  }

  .blue-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .blue-stats div:nth-child(2) {
    border-right: 0;
  }

  .blue-stats div:nth-child(-n+2) {
    border-bottom: 1px solid var(--line);
  }

  .download-card {
    align-items: stretch;
    flex-direction: column;
  }

  .seo-hero-inner {
    grid-template-columns: 1fr;
    min-height: auto;
    gap: 32px;
    padding: 54px 0 68px;
  }

  .seo-grid,
  .seo-process {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .seo-related-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .site-header {
    min-height: 62px;
    padding: 0 14px;
  }

  .brand {
    font-size: 16px;
  }

  .brand-logo {
    width: 30px;
    height: 30px;
  }

  .nav-download {
    padding: 0 12px;
    font-size: 13px;
  }

  .hero-inner {
    width: min(100% - 28px, 1220px);
    min-height: auto;
    gap: 26px;
    padding: 38px 0 96px;
  }

  .hero-preview {
    border-width: 6px;
    border-radius: 14px;
  }

  .section,
  .feature-grid,
  .pricing-section,
  .flow-section,
  .download-card,
  .faq-section,
  .blue-stats {
    width: min(100% - 28px, 1180px);
  }

  .section-title {
    padding: 72px 0 24px;
  }

  .section-title h2,
  .flow-copy h2,
  .download-card h2,
  .faq-section h2 {
    font-size: clamp(26px, 8vw, 34px);
  }

  .subtitle,
  .section-title p,
  .flow-copy p {
    font-size: 15px;
  }

  .blue-stats,
  .feature-grid,
  .faq-grid {
    grid-template-columns: 1fr;
  }

  .blue-stats div {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .blue-stats div:last-child {
    border-bottom: 0;
  }

  .feature-card {
    min-height: 0;
  }

  .flow-item {
    grid-template-columns: 1fr;
  }

  .site-footer {
    flex-direction: column;
  }

  .site-footer {
    display: flex;
  }

  .site-footer-links {
    justify-content: flex-start;
  }

  .seo-hero-inner,
  .seo-section,
  .seo-cta,
  .seo-related {
    width: min(100% - 28px, 1180px);
  }

  .seo-section {
    padding-top: 66px;
  }

  .seo-grid,
  .seo-process,
  .seo-related-links {
    grid-template-columns: 1fr;
  }

  .seo-cta {
    align-items: stretch;
    flex-direction: column;
  }
}

@media (max-width: 420px) {
  .site-header {
    padding: 0 12px;
  }

  .brand span:last-child {
    max-width: 92px;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .nav-download {
    min-height: 34px;
    padding: 0 10px;
    font-size: 12px;
  }

  h1 {
    font-size: clamp(38px, 14vw, 52px);
  }

  .hero-actions {
    flex-direction: column;
  }

  .primary-btn,
  .outline-btn {
    width: 100%;
  }

  .blue-stats {
    margin-top: -68px;
  }
}

@media (max-height: 760px) and (min-width: 961px) {
  .hero-inner {
    min-height: 610px;
    padding-top: 44px;
    padding-bottom: 112px;
  }

  .hero-preview {
    width: min(690px, 100%);
  }
}