:root {
  --bg: #f6f8fb;
  --surface: #ffffff;
  --surface-soft: #eef4fb;
  --ink: #17212b;
  --muted: #5b6b7c;
  --line: #d8e2ec;
  --primary: #1769e0;
  --primary-dark: #0d4fb0;
  --teal: #0f766e;
  --amber: #b7791f;
  --green: #0f7b5f;
  --danger: #b42318;
  --shadow: 0 14px 38px rgba(23, 33, 43, 0.1);
  --radius: 8px;
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  letter-spacing: 0;
}

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

a {
  color: var(--primary);
  text-decoration: none;
}

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

button,
input,
summary {
  font: inherit;
}

pre {
  overflow-x: auto;
  margin: 14px 0 0;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #101923;
  color: #e8eef5;
  line-height: 1.55;
}

code {
  font-family: Consolas, "SFMono-Regular", Menlo, monospace;
  font-size: 0.93em;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(216, 226, 236, 0.82);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(16px);
}

.nav-shell {
  max-width: var(--max);
  margin: 0 auto;
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding: 0 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  font-weight: 700;
  white-space: nowrap;
}

.brand img {
  width: 34px;
  height: 34px;
}

.brand small {
  display: block;
  color: var(--muted);
  font-size: 12px;
  font-weight: 500;
  line-height: 1;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
}

.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  content: "";
}

.nav-toggle span::before {
  transform: translateY(-6px);
}

.nav-toggle span::after {
  transform: translateY(4px);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-links a {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  border-radius: var(--radius);
  color: #334155;
  font-size: 15px;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  background: #eef4fb;
  color: var(--primary-dark);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 42px;
  padding: 9px 16px;
  border: 1px solid var(--primary);
  border-radius: var(--radius);
  background: var(--primary);
  color: #fff;
  cursor: pointer;
  font-weight: 700;
}

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

.page-hero {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}

.hero-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(420px, 1.1fr);
  gap: 44px;
  align-items: center;
  padding: 70px 24px 58px;
}

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

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 16px;
  color: var(--teal);
  font-weight: 700;
  font-size: 14px;
}

.eyebrow::before {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--teal);
  content: "";
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.22;
  letter-spacing: 0;
}

h1 {
  max-width: 760px;
  font-size: clamp(34px, 5vw, 58px);
}

h2 {
  font-size: clamp(27px, 3.4vw, 42px);
}

h3 {
  font-size: 21px;
}

.lead {
  margin: 20px 0 0;
  max-width: 720px;
  color: var(--muted);
  font-size: 18px;
}

.hero-actions,
.actions-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  font-weight: 700;
  text-align: center;
}

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

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

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

.btn.ghost {
  background: #eef4fb;
}

.btn.small {
  min-height: 38px;
  padding: 8px 12px;
  font-size: 14px;
}

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

.browser-frame {
  overflow: hidden;
  border: 1px solid #c7d3e0;
  border-radius: var(--radius);
  background: #eef4fb;
  box-shadow: var(--shadow);
}

.frame-bar {
  height: 38px;
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 0 14px;
  border-bottom: 1px solid #c7d3e0;
  background: #f9fbfd;
}

.frame-bar i {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: #cbd5df;
}

.browser-frame img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.trust-strip {
  border-top: 1px solid var(--line);
  background: #fbfcfe;
}

.trust-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  padding: 0 24px;
}

.trust-item {
  padding: 22px 20px;
  background: #fbfcfe;
  border-left: 1px solid var(--line);
}

.trust-item:last-child {
  border-right: 1px solid var(--line);
}

.trust-item strong {
  display: block;
  color: var(--ink);
  font-size: 18px;
}

.trust-item span {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 14px;
}

.section {
  padding: 76px 24px;
}

.section.alt {
  background: var(--surface);
  border-block: 1px solid var(--line);
}

.section.tight {
  padding-block: 52px;
}

.container {
  max-width: var(--max);
  margin: 0 auto;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 28px;
  margin-bottom: 30px;
}

.section-head p {
  max-width: 650px;
  margin: 12px 0 0;
  color: var(--muted);
}

.grid {
  display: grid;
  gap: 18px;
}

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

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

.grid.cols-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 24px;
}

.card[href] {
  display: block;
  color: var(--ink);
}

.card[href]:hover {
  border-color: var(--primary);
  box-shadow: 0 12px 26px rgba(23, 105, 224, 0.1);
}

.card h3 {
  margin-bottom: 10px;
}

.card p,
.card li {
  color: var(--muted);
}

.card p {
  margin: 0;
}

.icon-mark {
  width: 42px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #f4f8fc;
  color: var(--primary);
  font-weight: 800;
}

.feature-split {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(420px, 1.05fr);
  gap: 42px;
  align-items: center;
}

.feature-split img {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.text-list {
  display: grid;
  gap: 16px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.text-list li {
  padding: 16px 0 16px 18px;
  border-left: 3px solid var(--primary);
  color: var(--muted);
}

.text-list strong {
  display: block;
  margin-bottom: 4px;
  color: var(--ink);
}

.compare-table {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 720px;
}

th,
td {
  padding: 15px 18px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  background: #eef4fb;
  color: var(--ink);
}

td {
  color: var(--muted);
}

tr:last-child td {
  border-bottom: 0;
}

.download-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.45fr);
  gap: 22px;
  align-items: stretch;
}

.download-primary {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 32px;
}

.download-meta {
  display: grid;
  gap: 12px;
  margin-top: 22px;
}

.meta-line {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
}

.meta-line strong {
  color: var(--ink);
}

.notice {
  border-left: 4px solid var(--amber);
  border-radius: var(--radius);
  background: #fff8eb;
  padding: 18px 20px;
  color: #694600;
}

.notice.green {
  border-left-color: var(--green);
  background: #edf8f4;
  color: #174c3c;
}

.step-list {
  counter-reset: steps;
  display: grid;
  gap: 16px;
  padding: 0;
  list-style: none;
}

.step-list li {
  counter-increment: steps;
  position: relative;
  padding: 20px 20px 20px 68px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.step-list li::before {
  position: absolute;
  left: 20px;
  top: 20px;
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  background: var(--primary);
  color: #fff;
  content: counter(steps);
  font-weight: 800;
}

.step-list p {
  margin: 8px 0 0;
  color: var(--muted);
}

.faq-list {
  display: grid;
  gap: 12px;
}

details {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 0 18px;
}

summary {
  min-height: 58px;
  display: flex;
  align-items: center;
  cursor: pointer;
  color: var(--ink);
  font-weight: 700;
}

details p {
  margin: 0 0 18px;
  color: var(--muted);
}

.source-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.source-list a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 7px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--muted);
  font-size: 14px;
}

.site-footer {
  background: #101923;
  color: #e8eef5;
  padding: 48px 24px 28px;
}

.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  gap: 80px;
}

.site-footer a {
  color: #d4e3f4;
  display: block;
  width:25%;
}

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

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
}

.footer-brand img {
  width: 34px;
  height: 34px;
}

.site-footer p {
  color: #aebccd;
}

.footer-links {
	display: flex;
  gap: 8px;
}

.footer-links strong {
  color: #fff;
}

.footer-bottom {
  max-width: var(--max);
  margin: 30px auto 0;
  padding-top: 22px;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  color: #aebccd;
  font-size: 14px;
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(11, 18, 26, 0.58);
}

.modal.is-open {
  display: flex;
}

.modal-card {
  width: min(760px, 100%);
  max-height: calc(100vh - 48px);
  overflow: auto;
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 22px 70px rgba(0, 0, 0, 0.28);
}

.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 22px 24px;
  border-bottom: 1px solid var(--line);
}

.modal-head p {
  margin: 6px 0 0;
  color: var(--muted);
}

.modal-close {
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #f7fafc;
  color: var(--ink);
  cursor: pointer;
  font-size: 24px;
  line-height: 1;
}

.qr-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  padding: 24px;
}

.qr-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  text-align: center;
}

.qr-item img {
  width: min(220px, 100%);
  margin: 12px auto;
}

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

.modal-foot {
  padding: 0 24px 24px;
  color: var(--muted);
  font-size: 14px;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -80px;
  z-index: 100;
  padding: 10px 14px;
  background: var(--primary);
  color: #fff;
  border-radius: var(--radius);
}

.skip-link:focus {
  top: 16px;
}

@media (max-width: 980px) {
  .hero-inner,
  .feature-split,
  .download-panel {
    grid-template-columns: 1fr;
  }

  .hero-inner {
    padding-top: 46px;
  }

  .trust-inner,
  .grid.cols-4,
  .grid.cols-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (max-width: 760px) {
  .nav-shell {
    min-height: 64px;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .nav-links {
    position: fixed;
    left: 0;
    right: 0;
    top: 64px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    border-bottom: 1px solid var(--line);
    background: var(--surface);
    padding: 10px 24px 18px;
  }

  body.nav-open .nav-links {
    display: flex;
  }

  .nav-links a,
  .nav-links button {
    width: 100%;
    justify-content: flex-start;
  }

  .section {
    padding-block: 54px;
  }

  .section-head {
    display: block;
  }

  .trust-inner,
  .grid.cols-2,
  .grid.cols-3,
  .grid.cols-4,
  .qr-grid,
  .footer-inner {
    grid-template-columns: 1fr;
  }

  .trust-item,
  .trust-item:last-child {
    border: 0;
    border-bottom: 1px solid var(--line);
  }

  .download-primary {
    padding: 24px;
  }
}