:root {
  --bg: #f4f8ff;
  --bg-soft: #ffffff;
  --bg-accent: #eaf2ff;
  --line: #d9e5ff;
  --ink: #102241;
  --ink-soft: #4d628a;
  --brand: #1677ff;
  --brand-deep: #0f5fd6;
  --brand-light: #dfefff;
  --ok: #19a974;
  --radius-lg: 20px;
  --radius-md: 14px;
  --shadow: 0 14px 38px rgba(16, 34, 65, 0.08);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 10% -10%, rgba(22, 119, 255, 0.2), transparent 40%),
    radial-gradient(circle at 90% 0, rgba(46, 190, 255, 0.16), transparent 42%),
    var(--bg);
  line-height: 1.65;
}

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

.container {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  border-bottom: 1px solid rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(14px);
  background: rgba(255, 255, 255, 0.78);
}

.topbar-inner {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.2px;
}

.brand svg {
  width: 30px;
  height: 30px;
}

.brand small {
  display: block;
  color: var(--ink-soft);
  font-weight: 500;
  font-size: 12px;
  margin-top: 2px;
}

.main-nav {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #f0f5ff;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px;
}

.nav-link {
  padding: 8px 16px;
  border-radius: 999px;
  color: #324f7c;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.2s ease;
}

.nav-link:hover {
  background: #e4edff;
  color: #143060;
}

.page-home .nav-home,
.page-download .nav-download,
.page-zh .nav-zh {
  color: #fff;
  background: linear-gradient(135deg, #1677ff, #0f5fd6);
  box-shadow: 0 8px 20px rgba(22, 119, 255, 0.28);
}

.hero {
  padding: 56px 0 22px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.16fr 0.84fr;
  gap: 24px;
  align-items: stretch;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  background: var(--brand-light);
  border: 1px solid #cbe0ff;
  color: #2358a8;
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 600;
}

.eyebrow svg {
  width: 16px;
  height: 16px;
}

.hero-title {
  margin: 0;
  font-size: clamp(28px, 4vw, 48px);
  line-height: 1.2;
  letter-spacing: 0.2px;
}

.hero-subtitle {
  margin-top: 14px;
  margin-bottom: 0;
  color: var(--ink-soft);
  font-size: 17px;
  max-width: 58ch;
}

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

.btn {
  border: 1px solid transparent;
  border-radius: 12px;
  padding: 12px 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn:disabled {
  cursor: not-allowed;
  opacity: 0.9;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn svg {
  width: 18px;
  height: 18px;
}

.btn-primary {
  color: #fff;
  border-color: #1166e3;
  background: linear-gradient(135deg, #177cff, #0f5fd6);
  box-shadow: 0 12px 22px rgba(22, 119, 255, 0.25);
}

.btn-secondary {
  color: #194686;
  border-color: #bfd7ff;
  background: #f1f7ff;
}

.btn-ghost {
  color: #355178;
  border-color: var(--line);
  background: #fff;
}

.hero-panel,
.card,
.quote-card,
.faq-list details,
.table-wrap,
.timeline,
.cta-highlight {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.hero-panel {
  padding: 22px;
}

.stat-list {
  list-style: none;
  padding: 0;
  margin: 14px 0 0;
  display: grid;
  gap: 10px;
}

.stat-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  color: #2d4b76;
}

.stat-list svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  margin-top: 4px;
  color: var(--brand-deep);
}

.tag-row {
  margin-top: 18px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.tag {
  font-size: 12px;
  border-radius: 999px;
  background: #edf4ff;
  border: 1px solid #cfe2ff;
  color: #38609e;
  padding: 5px 10px;
}

.section {
  margin-top: 48px;
}

.section-head {
  margin-bottom: 18px;
}

.section-head h2 {
  margin: 0;
  font-size: clamp(24px, 2.4vw, 34px);
  line-height: 1.28;
}

.section-head p {
  margin: 10px 0 0;
  color: var(--ink-soft);
}

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

.card {
  padding: 20px;
}

.card h3 {
  margin: 12px 0 8px;
  font-size: 19px;
}

.card p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 14px;
}

.card .icon {
  width: 24px;
  height: 24px;
  color: var(--brand-deep);
}

.platform-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.platform-title {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
}

.platform-title svg {
  width: 20px;
  height: 20px;
}

.platform-note {
  margin-top: 10px;
  font-size: 13px;
  color: #56729b;
  min-height: 42px;
}

.platform-card .btn {
  margin-top: 14px;
  width: 100%;
}

.quote-card {
  padding: 18px;
}

.quote-header {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #2e568f;
  font-size: 13px;
  font-weight: 600;
}

.quote-header svg {
  width: 16px;
  height: 16px;
}

.quote-card p {
  margin: 10px 0;
  color: #264069;
}

.quote-card strong {
  font-size: 14px;
}

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

.faq-list details {
  padding: 0;
  overflow: hidden;
}

.faq-list summary {
  list-style: none;
  padding: 16px 18px;
  cursor: pointer;
  font-weight: 700;
  color: #1a3765;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary svg {
  width: 16px;
  height: 16px;
  color: #4c6997;
  transition: transform 0.2s ease;
}

.faq-list details[open] summary svg {
  transform: rotate(180deg);
}

.faq-content {
  border-top: 1px solid #e6efff;
  padding: 14px 18px 18px;
  color: #4b628a;
  font-size: 14px;
}

.download-focus {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 14px;
}

.focus-list {
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.focus-list li {
  display: inline-flex;
  align-items: flex-start;
  gap: 8px;
  color: #35527e;
}

.focus-list svg {
  width: 16px;
  height: 16px;
  color: var(--ok);
  flex-shrink: 0;
  margin-top: 4px;
}

.table-wrap {
  overflow-x: auto;
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
}

.spec-table th,
.spec-table td {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid #e7f0ff;
  font-size: 14px;
}

.spec-table th {
  color: #1c3d6f;
  background: #f5f9ff;
}

.spec-table td {
  color: #3f5a84;
}

.timeline {
  padding: 18px;
}

.timeline ol {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.timeline li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.step-index {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: linear-gradient(135deg, #1677ff, #0f5fd6);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
}

.muted {
  color: var(--ink-soft);
}

.article-layout {
  display: grid;
  gap: 14px;
}

.article-block {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 18px;
}

.article-block h2,
.article-block h3 {
  margin-top: 0;
}

.article-block p,
.article-block li {
  color: #3d5680;
}

.article-block ul {
  margin: 0;
  padding-left: 20px;
}

.log-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.cta-highlight {
  margin-top: 18px;
  padding: 24px;
  text-align: center;
  background:
    linear-gradient(140deg, rgba(22, 119, 255, 0.12), rgba(26, 210, 190, 0.08)),
    #fff;
}

.cta-highlight h2 {
  margin-top: 0;
  margin-bottom: 8px;
}

.cta-highlight p {
  margin-top: 0;
  color: #4a6289;
}

.cta-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
  padding: 12px 24px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, #1677ff, #0e61dc);
  box-shadow: 0 12px 24px rgba(22, 119, 255, 0.26);
}

.site-footer {
  margin-top: 54px;
  padding: 28px 0 34px;
  border-top: 1px solid var(--line);
  color: #486288;
  font-size: 14px;
  text-align: center;
}

.site-footer .safe-line {
  margin-bottom: 8px;
  font-weight: 600;
  color: #1f3d6f;
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@media (max-width: 980px) {
  .hero-grid,
  .download-focus,
  .feature-grid,
  .platform-grid,
  .quote-grid,
  .info-grid,
  .log-grid {
    grid-template-columns: 1fr 1fr;
  }

  .download-focus .card:last-child {
    grid-column: 1 / -1;
  }
}

@media (max-width: 760px) {
  .container {
    width: min(1120px, calc(100% - 24px));
  }

  .topbar-inner {
    min-height: 68px;
    flex-direction: column;
    justify-content: center;
    padding: 10px 0;
  }

  .main-nav {
    width: 100%;
    justify-content: space-between;
  }

  .nav-link {
    flex: 1;
    text-align: center;
    padding: 8px 10px;
  }

  .hero {
    padding-top: 36px;
  }

  .hero-grid,
  .download-focus,
  .feature-grid,
  .platform-grid,
  .quote-grid,
  .info-grid,
  .log-grid {
    grid-template-columns: 1fr;
  }

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

  .btn,
  .platform-card .btn {
    width: 100%;
  }
}