:root {
  --blue: #0057ff;
  --blue-hover: #0048db;
  --ink: #101b30;
  --muted: #536985;
  --border: #dfe9f7;
  --green: #00a878;
  --surface: #f3f9ff;
  --radius: 14px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 100px;
}

body {
  margin: 0;
  color: var(--ink);
  background: #fff;
  font-family: "Segoe UI", "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
}

body > header,
body > main,
body > footer {
  margin-inline: auto;
}

.container {
  width: 100%;
  max-width: 1280px;
  margin: auto;
  padding: 0 1rem;
}

h1,
h2,
h3,
p,
ul {
  margin: 0;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  color: inherit;
  font: inherit;
  cursor: pointer;
}

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

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

button:focus-visible,
a:focus-visible,
summary:focus-visible {
  outline: 3px solid #80afff;
  outline-offset: 5px;
}

[hidden] {
  display: none !important;
}

.header {
  background: #fff;
  border-bottom: 1px solid #edf2f8;
}

.nav-row {
  display: flex;
  align-items: center;
  gap: 28px;
  min-height: 84px;
}

.brand-link {
  flex-shrink: 0;
}

.brand {
  width: 151px;
  height: auto;
}

.main-nav {
  display: flex;
  align-items: stretch;
  align-self: stretch;
  gap: 26px;
  margin-left: 40px;
  margin-right: auto;
}

.main-nav a,
.main-nav button {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 0;
  color: var(--muted);
  background: none;
  border: 0;
  font-size: 15px;
  font-weight: 500;
  white-space: nowrap;
}

.main-nav a:hover,
.main-nav button:hover,
.main-nav .active {
  color: var(--blue);
}

.main-nav .active::after {
  position: absolute;
  right: 0;
  bottom: 15px;
  left: 0;
  height: 2px;
  content: "";
  background: var(--blue);
  border-radius: 2px;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 30px;
  flex-shrink: 0;
}

.language {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  color: #3c5470;
  font-size: 15px;
  line-height: 1;
  white-space: nowrap;
}

.language-icon,
.language-arrow {
  opacity: .7;
}

.menu-toggle {
  display: none;
  padding: 8px;
  background: none;
  border: 0;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 52px;
  padding: 12px 28px;
  border: 1px solid var(--blue);
  border-radius: 9px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.35;
  transition: background .2s, box-shadow .2s, transform .2s;
}

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

.primary img {
  filter: brightness(0) invert(1);
}

.outline {
  color: var(--blue);
  background: #fff;
}

.button:hover {
  box-shadow: 0 6px 20px #0057ff22;
  transform: translateY(-2px);
}

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

.outline:hover {
  background: #edf4ff;
}

.small {
  min-height: 44px;
  padding: 10px 23px;
  font-size: 15px;
}

.hero {
  overflow: hidden;
  background:
    radial-gradient(ellipse at 83% 47%, #aad8ff99 0, transparent 62%),
    linear-gradient(110deg, #fafdff 15%, #edf7ff 55%, #dcf0ff);
}

.hero-grid {
  display: grid;
  grid-template-columns: .96fr 1.04fr;
  align-items: center;
  gap: 28px;
  min-height: 546px;
  padding-top: 64px;
  padding-bottom: 64px;
}

.eyebrow {
  display: inline-block;
  margin-bottom: 18px;
  padding: 4px 10px;
  color: var(--blue);
  background: #d3e5ff;
  border-radius: 5px;
  font-size: 15px;
  font-weight: 650;
  line-height: 1.5;
}

h1 {
  font-size: clamp(36px, 3.6vw, 48px);
  font-weight: 750;
  line-height: 1.26;
  letter-spacing: .2px;
}

h1 span {
  display: block;
  margin-bottom: 6px;
  font-size: clamp(48px, 4.5vw, 64px);
  font-weight: 750;
  line-height: 1.1;
  letter-spacing: -1.4px;
}

.hero-description {
  margin-top: 23px;
  color: #455e7d;
  font-size: 17px;
  line-height: 1.85;
}

.hero-checks {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  margin: 23px 0 30px;
  padding: 0;
  list-style: none;
  font-size: 15px;
}

.hero-checks li {
  display: flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
}

.hero-checks li::before {
  width: 19px;
  height: 19px;
  color: #fff;
  background: var(--blue);
  border-radius: 50%;
  content: "✓";
  font-size: 13px;
  line-height: 19px;
  text-align: center;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.hero-buttons .primary {
  min-width: 222px;
}

.hero-buttons .outline {
  min-width: 180px;
  background: #ffffff75;
}

.version {
  margin-top: 22px;
  color: var(--muted);
  font-size: 14px;
}

.version span {
  display: inline-block;
  margin-left: 12px;
}

.hero-visual {
  min-width: 0;
}

.hero-art {
  width: 100%;
  height: auto;
}

.section {
  padding: 60px 0;
}

.section-heading {
  margin-bottom: 32px;
}

.section-heading h2 {
  font-size: 30px;
  font-weight: 700;
  line-height: 1.4;
}

.section-heading h2::before {
  display: block;
  width: 32px;
  height: 3px;
  margin-bottom: 13px;
  background: var(--blue);
  border-radius: 2px;
  content: "";
}

.section-heading p {
  margin-top: 8px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.75;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 24px;
}

.feature {
  position: relative;
  padding: 6px 8px 0;
  text-align: center;
}

.feature + .feature::before {
  position: absolute;
  top: 17px;
  bottom: 5px;
  left: -12px;
  width: 1px;
  background: #e8eff8;
  content: "";
}

.feature img {
  margin: 0 auto 18px;
  border-radius: 19px;
}

.feature h3 {
  margin-bottom: 12px;
  font-size: 20px;
  line-height: 1.5;
}

.feature p {
  color: var(--muted);
  font-size: 15px;
  line-height: 1.85;
}

.downloads {
  background: linear-gradient(115deg, #f2f9ff, #f7fbff);
}

.download-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  margin-bottom: 30px;
}

.download-heading .section-heading {
  margin-bottom: 0;
}

.nodes-card {
  position: relative;
  display: flex;
  align-items: center;
  flex-shrink: 0;
  width: 350px;
  min-height: 124px;
  padding: 22px;
  overflow: hidden;
  background: #ffffffb0;
  border: 1px solid #fff;
  border-radius: 16px;
  box-shadow: 0 5px 24px #c0d7ee1c;
}

.nodes-card div {
  position: relative;
  z-index: 1;
}

.nodes-card h3 {
  color: var(--blue);
  font-size: 20px;
  line-height: 1.5;
}

.nodes-card p {
  margin-top: 7px;
  color: var(--muted);
  font-size: 14px;
}

.nodes-card img {
  position: absolute;
  right: 0;
  bottom: 0;
  width: 118px;
  height: auto;
  opacity: .65;
  mix-blend-mode: multiply;
}

.platform-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 20px;
}

.platform {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 185px;
  padding: 23px 10px;
  background: #ffffffbb;
  border: 1px solid #e7f0fb;
  border-radius: var(--radius);
  text-align: center;
  transition: transform .2s, box-shadow .2s, border-color .2s;
}

.platform:hover {
  border-color: #b9d1ff;
  box-shadow: 0 8px 26px #6595d51a;
  transform: translateY(-4px);
}

.platform img {
  width: 40px;
  height: 46px;
  margin-bottom: 12px;
  object-fit: contain;
}

.platform strong {
  margin-bottom: 7px;
  font-size: 20px;
  font-weight: 600;
}

.platform span {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.8;
}

.plans {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}

.plan {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 27px 25px 25px;
  overflow: hidden;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 3px 14px #adc5ea20;
}

.plan h3 {
  font-size: 22px;
  line-height: 1.4;
}

.plan-description {
  min-height: 26px;
  margin-top: 7px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

.price {
  margin: 19px 0 16px;
  color: var(--blue);
  font-size: 36px;
  font-weight: 750;
  line-height: 1.3;
  letter-spacing: -.5px;
}

.price span {
  color: var(--muted);
  font-size: 14px;
  font-weight: 400;
}

.plan ul {
  flex-grow: 1;
  margin-bottom: 25px;
  padding: 0;
  color: var(--muted);
  list-style: none;
  font-size: 15px;
  line-height: 2.1;
}

.plan li::before {
  margin-right: 10px;
  color: var(--green);
  content: "✓";
  font-weight: 650;
}

.plan .button {
  width: 100%;
  min-height: 45px;
  padding: 10px 12px;
  font-size: 15px;
}

.recommended {
  padding: 26px 24px 24px;
  border: 2px solid var(--blue);
  box-shadow: 0 8px 28px #0057ff12;
}

.recommended h3 {
  color: var(--blue);
}

.recommended-label {
  position: absolute;
  top: 0;
  right: 0;
  padding: 3px 18px;
  color: #fff;
  background: var(--blue);
  border-radius: 0 0 0 16px;
  font-size: 14px;
}

.pricing-note {
  margin-top: 20px;
  color: var(--muted);
  font-size: 14px;
}

.blog {
  background: linear-gradient(115deg, #f3faff, #f8fbff);
}

.heading-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.text-button {
  padding: 8px 0;
  color: var(--blue);
  background: none;
  border: 0;
  font-size: 15px;
  font-weight: 600;
  white-space: nowrap;
}

.text-button:hover {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.articles {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}

.article {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: #fff;
  border: 1px solid #edf2f8;
  border-radius: var(--radius);
  transition: box-shadow .2s, transform .2s;
}

.article:hover {
  box-shadow: 0 8px 26px #5a7cab15;
  transform: translateY(-3px);
}

.article > img {
  width: 100%;
  height: auto;
  aspect-ratio: 209 / 76;
  object-fit: cover;
}

.article-content {
  display: flex;
  flex-direction: column;
  flex-grow: 1;
  padding: 20px;
}

.article h3 {
  font-size: 18px;
  line-height: 1.55;
}

.article h3 a {
  padding: 0;
  background: none;
  border: 0;
  font: inherit;
  font-weight: 650;
  line-height: inherit;
  text-align: left;
}

.article h3 a:hover {
  color: var(--blue);
}

.article p {
  flex-grow: 1;
  margin: 12px 0 18px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.8;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2; /* 2行后省略 */
  -webkit-box-orient: vertical;
}
.article-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: auto;
}

.article-footer time {
  color: #547396;
  font-size: 14px;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.article-read {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0;
  color: var(--blue);
  background: none;
  border: 0;
  font-size: 14px;
  line-height: 1.6;
  white-space: nowrap;
}

.article-read:hover {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: stretch;
  grid-auto-rows: 1fr;
  gap: 24px;
}

.qa-card {
  height: 100%;
  min-width: 0;
  padding: 24px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
}

.qa-question {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin: 0 0 16px;
  color: var(--ink);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.65;
}

.qa-answer {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.9;
}

.qa-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 28px;
  width: 28px;
  height: 28px;
  border-radius: 7px;
  font-size: 14px;
  font-weight: 650;
  line-height: 1;
}

.question-mark {
  margin-top: 1px;
  color: #0051df;
  background: #edf4ff;
}

.answer-mark {
  margin-top: 2px;
  color: #526986;
  background: #f1f5f9;
}

.footer {
  padding: 30px 0;
  color: #fff;
  background: linear-gradient(110deg, #0c1828, #101e31);
}

.footer-row {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 30px;
}

.footer-brand img {
  width: 143px;
  height: auto;
}

.footer-brand p {
  margin-top: 9px;
  color: #a5b4c8;
  font-size: 14px;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
}

.footer-nav a,
.footer-nav button {
  padding: 0;
  color: #b5c2d4;
  background: none;
  border: 0;
  font-size: 15px;
  font-weight: 500;
  line-height: 1.8;
  white-space: nowrap;
}

.footer-nav a:hover,
.footer-nav button:hover {
  color: #fff;
}

.footer-right {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 18px;
}

.copyright {
  color: #b1bfd2;
  font-size: 14px;
  line-height: 1.6;
  white-space: normal;
}

.back-to-top {
  position: fixed;
  right: 2rem;
  bottom: 26px;
  z-index: 20;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  padding: 0;
  background: #fff;
  border: 1px solid #d7e5f8;
  border-radius: 12px;
  box-shadow: 0 6px 22px #1027471f;
  transition: transform .2s, background .2s;
}

.back-to-top:hover {
  background: #eaf3ff;
  transform: translateY(-3px);
}

@media (max-width: 1100px) {
  .nav-row {
    gap: 18px;
  }

  .brand {
    width: 134px;
  }

  .main-nav {
    gap: 18px;
    margin-left: 10px;
  }

  .nav-actions {
    gap: 20px;
  }

  .hero-grid {
    gap: 18px;
    min-height: 500px;
    padding-top: 50px;
    padding-bottom: 50px;
  }

  .hero-description {
    font-size: 16px;
  }

  .hero-checks {
    gap: 10px 14px;
    font-size: 14px;
  }

  .hero-buttons {
    gap: 12px;
  }

  .hero-buttons .primary,
  .hero-buttons .outline {
    min-width: 0;
    padding-right: 20px;
    padding-left: 20px;
  }

  .feature-grid {
    gap: 18px;
  }

  .feature h3 {
    font-size: 18px;
  }

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

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

}

@media (max-width: 900px) {
  .nav-row {
    position: relative;
    min-height: 76px;
  }

  .menu-toggle {
    display: block;
    flex-shrink: 0;
  }

  .nav-actions {
    margin-left: auto;
  }

  .main-nav {
    position: absolute;
    top: 76px;
    right: 16px;
    left: 16px;
    z-index: 10;
    display: none;
    align-items: stretch;
    flex-direction: column;
    gap: 0;
    margin: 0;
    padding: 10px 18px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 0 0 12px 12px;
    box-shadow: 0 12px 24px #13294712;
  }

  .main-nav.open {
    display: flex;
  }

  .main-nav a,
  .main-nav button {
    min-height: 44px;
    padding: 8px 0;
    text-align: left;
  }

  .main-nav .active::after {
    display: none;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 38px;
    padding-top: 44px;
    padding-bottom: 44px;
    text-align: center;
  }

  h1 {
    font-size: 43px;
  }

  h1 span {
    font-size: 60px;
  }

  .hero-checks,
  .hero-buttons {
    justify-content: center;
  }

  .hero-visual {
    width: 100%;
    max-width: 640px;
    margin-inline: auto;
  }

  .feature-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 32px 20px;
  }

  .feature + .feature::before {
    display: none;
  }

  .download-heading {
    align-items: flex-start;
    flex-direction: column;
    gap: 22px;
  }

  .nodes-card {
    width: 100%;
  }

  .footer-row {
    grid-template-columns: 1fr 1fr;
    gap: 25px;
  }

  .footer-right {
    align-items: flex-end;
  }
}

@media (max-width: 600px) {
  .section {
    padding: 44px 0;
  }

  .section-heading {
    margin-bottom: 25px;
  }

  .section-heading h2 {
    font-size: 27px;
  }

  .section-heading p {
    font-size: 15px;
  }

  .nav-row {
    gap: 8px;
  }

  .brand {
    width: 126px;
  }

  .language {
    display: none;
  }

  .nav-actions {
    gap: 0;
  }

  .small {
    min-height: 40px;
    padding: 9px 16px;
    font-size: 14px;
  }

  .hero-grid {
    gap: 30px;
    padding-top: 36px;
    padding-bottom: 40px;
  }

  .eyebrow {
    font-size: 13px;
  }

  h1 {
    font-size: 36px;
  }

  h1 span {
    font-size: 52px;
  }

  .hero-description {
    font-size: 16px;
  }

  .desktop-break {
    display: none;
  }

  .hero-checks {
    gap: 10px 14px;
    margin: 22px 0 25px;
    font-size: 14px;
  }

  .hero-buttons {
    gap: 12px;
  }

  .hero-buttons .button {
    padding: 12px 17px;
    font-size: 15px;
  }

  .version span {
    display: block;
    margin: 3px 0 0;
  }

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

  .feature-grid {
    gap: 28px 18px;
  }

  .feature:last-child {
    grid-column: 1 / -1;
  }

  .feature p {
    font-size: 14px;
  }

  .platform-grid {
    gap: 16px;
  }

  .platform {
    min-height: 190px;
    padding: 22px 8px;
  }

  .platform strong {
    font-size: 19px;
  }

  .platform span {
    font-size: 14px;
  }

  .platform:last-child {
    grid-column: 1 / -1;
  }

  .plans,
  .articles,
  .faq-grid {
    grid-template-columns: 1fr;
  }

  .plan {
    padding: 26px;
  }

  .recommended {
    padding: 25px;
  }

  .heading-row {
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
  }

  .article h3 {
    font-size: 20px;
  }

  .article p {
    font-size: 15px;
  }

  .article-content {
    padding: 24px;
  }

  .qa-card {
    padding: 20px 18px;
  }

  .qa-question {
    font-size: 17px;
  }

  .footer-row {
    grid-template-columns: 1fr;
    gap: 25px;
  }

  .footer-nav {
    grid-row: auto;
    grid-column: auto;
    gap: 14px 24px;
  }

  .footer-right {
    align-items: flex-start;
    gap: 16px;
  }

}

@media (max-width: 360px) {
  .brand {
    width: 112px;
  }

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

  .hero-buttons .button {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition: none !important;
  }
}

.brand-link {
  width: 151px;
  overflow: hidden;
}

.brand {
  width: 247px;
  max-width: none;
  height: auto;
}

.footer-brand a {
  display: block;
  width: 143px;
  overflow: hidden;
}

.footer-brand img {
  width: 234px;
  max-width: none;
  height: auto;
}

@media (max-width: 600px) {
  .brand-link {
    width: 126px;
  }

  .brand {
    width: 206px;
  }
}