* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: #1a1a1a;
  background: #f8f9fa;
  line-height: 1.6;
}

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

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-20px); }
  to { opacity: 1; transform: translateX(0); }
}

/* ===== Navigation ===== */
.topnav {
  background: linear-gradient(135deg, #0ea5e9 0%, #06b6d4 100%);
  padding: 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  height: 60px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 18px;
  font-weight: 700;
  color: white;
  text-decoration: none;
}

.brand-icon {
  width: 28px;
  height: 28px;
}

.navlist {
  display: flex;
  list-style: none;
  gap: 0;
}

.navlist li {
  margin: 0;
}

.navlist a {
  display: block;
  padding: 20px 16px;
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.3s ease;
  border-bottom: 3px solid transparent;
}

.navlist a:hover {
  color: white;
  background: rgba(255, 255, 255, 0.1);
}

.navlist a.on {
  color: white;
  border-bottom-color: white;
  background: rgba(255, 255, 255, 0.15);
}

.nav-dl-btn {
  background: white;
  color: #0ea5e9;
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.3s ease;
}

.nav-dl-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* ===== Layout ===== */
.wrap {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.sec {
  padding: 60px 20px;
  animation: fadeIn 0.6s ease;
}

.sec-alt {
  background: white;
}

.sec-alt2 {
  background: linear-gradient(135deg, #f0f9ff 0%, #f0fdfa 100%);
}

.sec-hd {
  text-align: center;
  margin-bottom: 40px;
}

.eyebrow {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: #0ea5e9;
  margin-bottom: 8px;
}

.sec-title {
  font-size: 32px;
  font-weight: 700;
  color: #1a1a1a;
  margin-bottom: 12px;
}

.sec-sub {
  font-size: 16px;
  color: #666;
  max-width: 600px;
  margin: 0 auto;
}

/* ===== Hero ===== */
.hero {
  background: linear-gradient(135deg, #0ea5e9 0%, #06b6d4 50%, #0891b2 100%);
  padding: 80px 20px;
  color: white;
  text-align: center;
}

.hero-inner {
  max-width: 900px;
  margin: 0 auto;
}

.hero-label {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  opacity: 0.9;
  margin-bottom: 12px;
}

.hero-title {
  font-size: 42px;
  font-weight: 700;
  margin-bottom: 16px;
  line-height: 1.2;
}

.hero-desc {
  font-size: 18px;
  opacity: 0.95;
  margin-bottom: 32px;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 20px;
  margin-top: 40px;
  padding-top: 40px;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.stat-item {
  text-align: center;
}

.stat-num {
  font-size: 28px;
  font-weight: 700;
  display: block;
  margin-bottom: 4px;
}

.stat-label {
  font-size: 13px;
  opacity: 0.85;
}

/* ===== Feature Cards Grid ===== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-bottom: 0;
}

.feature-card {
  background: white;
  border-radius: 12px;
  padding: 32px 24px;
  text-align: center;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  transition: all 0.3s ease;
  animation: fadeIn 0.6s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.feature-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #e0f2fe 0%, #ccfbf1 100%);
  border-radius: 12px;
}

.feature-icon svg {
  width: 32px;
  height: 32px;
  color: #0ea5e9;
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
  color: #1a1a1a;
}

.feature-card p {
  font-size: 14px;
  color: #666;
  line-height: 1.6;
}

/* ===== Platform Strip ===== */
.plat-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-bottom: 0;
}

.plat-card {
  background: white;
  border-radius: 12px;
  padding: 28px 20px;
  text-align: center;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  transition: all 0.3s ease;
}

.plat-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.plat-card.featured {
  background: linear-gradient(135deg, #0ea5e9 0%, #06b6d4 100%);
  color: white;
}

.plat-ico {
  width: 48px;
  height: 48px;
  margin: 0 auto 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.plat-ico svg {
  width: 32px;
  height: 32px;
  color: #0ea5e9;
}

.plat-card.featured .plat-ico svg {
  color: white;
}

.plat-name {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}

.plat-ver {
  font-size: 12px;
  opacity: 0.7;
  margin-bottom: 16px;
}

.plat-card.featured .plat-ver {
  opacity: 0.85;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.3s ease;
  text-decoration: none;
  gap: 8px;
}

.btn-primary {
  background: linear-gradient(135deg, #0ea5e9 0%, #06b6d4 100%);
  color: white;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(14, 165, 233, 0.3);
}

.btn-primary:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.btn-outline {
  background: transparent;
  color: #0ea5e9;
  border: 2px solid #0ea5e9;
}

.btn-outline:hover {
  background: #e0f2fe;
}

.btn-white {
  background: white;
  color: #0ea5e9;
}

.btn-white:hover {
  background: #f0f9ff;
}

.btn-ghost {
  background: transparent;
  color: white;
  border: 2px solid white;
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.1);
}

.btn-lg {
  padding: 14px 32px;
  font-size: 16px;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 12px;
}

/* ===== Reviews ===== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  margin-bottom: 0;
}

.rev-card {
  background: white;
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  transition: all 0.3s ease;
}

.rev-card:hover {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.rev-top {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.rev-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, #0ea5e9 0%, #06b6d4 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 16px;
}

.rev-info {
  flex: 1;
}

.rev-name {
  font-size: 14px;
  font-weight: 600;
  color: #1a1a1a;
}

.rev-stars {
  font-size: 12px;
  color: #f59e0b;
}

.rev-text {
  font-size: 14px;
  color: #666;
  line-height: 1.6;
}

/* ===== Comparison Table ===== */
.cmp-wrap {
  overflow-x: auto;
}

.cmp-table {
  width: 100%;
  border-collapse: collapse;
  background: white;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.cmp-table th {
  background: linear-gradient(135deg, #0ea5e9 0%, #06b6d4 100%);
  color: white;
  padding: 16px;
  text-align: left;
  font-weight: 600;
  font-size: 14px;
}

.cmp-table td {
  padding: 14px 16px;
  border-bottom: 1px solid #e5e7eb;
  font-size: 14px;
}

.cmp-table tr:last-child td {
  border-bottom: none;
}

.cmp-table tr:nth-child(even) {
  background: #f9fafb;
}

.cmp-table .hl {
  background: #fef3c7;
  font-weight: 600;
}

/* ===== FAQ ===== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: white;
  border-radius: 12px;
  margin-bottom: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  overflow: hidden;
  transition: all 0.3s ease;
}

.faq-item:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.faq-q {
  padding: 18px 20px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: white;
  font-weight: 600;
  font-size: 15px;
  color: #1a1a1a;
  user-select: none;
  transition: all 0.3s ease;
}

.faq-q:hover {
  background: #f9fafb;
}

.faq-chevron {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #0ea5e9;
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

.faq-item.open .faq-chevron {
  transform: rotate(180deg);
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  background: #f9fafb;
}

.faq-item.open .faq-a {
  max-height: 500px;
}

.faq-a-inner {
  padding: 0 20px 18px;
  font-size: 14px;
  color: #666;
  line-height: 1.6;
}

/* ===== CTA Banner ===== */
.cta-banner {
  background: linear-gradient(135deg, #0ea5e9 0%, #06b6d4 100%);
  color: white;
  padding: 48px 20px;
  text-align: center;
  border-radius: 12px;
}

.cta-banner h2 {
  font-size: 28px;
  margin-bottom: 12px;
}

.cta-banner p {
  font-size: 16px;
  opacity: 0.95;
  margin-bottom: 24px;
}

/* ===== Download Page ===== */
.dl-hero {
  background: linear-gradient(135deg, #0ea5e9 0%, #06b6d4 50%, #0891b2 100%);
  padding: 60px 20px;
  color: white;
  text-align: center;
}

.dl-hero h1 {
  font-size: 36px;
  margin-bottom: 12px;
}

.dl-hero p {
  font-size: 16px;
  opacity: 0.95;
  max-width: 600px;
  margin: 0 auto;
}

.win-box {
  background: white;
  border-radius: 12px;
  padding: 32px;
  margin-bottom: 40px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
  border: 2px solid #e0f2fe;
}

.win-box h3 {
  font-size: 20px;
  margin-bottom: 24px;
  color: #1a1a1a;
}

.win-specs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.win-spec {
  text-align: center;
  padding: 12px;
  background: #f9fafb;
  border-radius: 8px;
}

.win-spec-label {
  font-size: 12px;
  color: #666;
  margin-bottom: 4px;
}

.win-spec-value {
  font-size: 14px;
  font-weight: 600;
  color: #1a1a1a;
}

.other-plats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}

.op-card {
  background: white;
  border-radius: 12px;
  padding: 24px;
  text-align: center;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.op-card h4 {
  font-size: 16px;
  margin-bottom: 8px;
}

.op-card p {
  font-size: 13px;
  color: #666;
  margin-bottom: 16px;
}

/* ===== Installation Guide ===== */
.guide-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 24px;
  margin-bottom: 0;
}

.gstep {
  background: white;
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.gstep-num {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, #0ea5e9 0%, #06b6d4 100%);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 18px;
  margin-bottom: 12px;
}

.gstep h4 {
  font-size: 16px;
  margin-bottom: 8px;
  color: #1a1a1a;
}

.gstep p {
  font-size: 14px;
  color: #666;
  line-height: 1.6;
}

/* ===== Requirements Grid ===== */
.req-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-bottom: 0;
}

.req-card {
  background: white;
  border-radius: 12px;
  padding: 20px;
  text-align: center;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.req-ico {
  width: 40px;
  height: 40px;
  margin: 0 auto 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #e0f2fe;
  border-radius: 8px;
}

.req-ico svg {
  width: 24px;
  height: 24px;
  color: #0ea5e9;
}

.req-card h4 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 8px;
  color: #1a1a1a;
}

.req-card p {
  font-size: 13px;
  color: #666;
}

/* ===== Version Timeline ===== */
.ver-timeline {
  position: relative;
  padding: 20px 0;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.ver-item {
  display: flex;
  gap: 20px;
  margin-bottom: 24px;
  position: relative;
  padding-left: 40px;
  max-width: 600px;
}

.ver-item::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 8px;
  width: 12px;
  height: 12px;
  background: linear-gradient(135deg, #0ea5e9 0%, #06b6d4 100%);
  border-radius: 50%;
  border: 3px solid white;
  box-shadow: 0 0 0 2px #0ea5e9;
}

.ver-item:not(:last-child)::after {
  content: '';
  position: absolute;
  left: 17px;
  top: 20px;
  width: 2px;
  height: calc(100% + 24px);
  background: #e5e7eb;
}

.ver-info {
  flex: 1;
}

.ver-tag {
  display: inline-block;
  background: #e0f2fe;
  color: #0ea5e9;
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 4px;
}

.ver-date {
  font-size: 13px;
  color: #666;
  margin-bottom: 4px;
}

.ver-desc {
  font-size: 14px;
  color: #1a1a1a;
  line-height: 1.6;
}

/* ===== Article Layout (zh-cn) ===== */
.article-hero {
  background: linear-gradient(135deg, #0ea5e9 0%, #06b6d4 50%, #0891b2 100%);
  padding: 60px 20px;
  color: white;
  text-align: center;
}

.article-hero h1 {
  font-size: 36px;
  margin-bottom: 12px;
}

.article-hero p {
  font-size: 16px;
  opacity: 0.95;
  max-width: 700px;
  margin: 0 auto;
}

.kw-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-top: 20px;
}

.kw {
  background: rgba(255, 255, 255, 0.2);
  color: white;
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 500;
}

.article-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 40px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 20px;
}

.article-body {
  background: white;
  border-radius: 12px;
  padding: 40px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.article-body h2 {
  font-size: 24px;
  margin: 32px 0 16px;
  color: #1a1a1a;
  padding-bottom: 12px;
  border-bottom: 2px solid #e0f2fe;
}

.article-body h3 {
  font-size: 18px;
  margin: 24px 0 12px;
  color: #1a1a1a;
}

.article-body p {
  margin-bottom: 16px;
  color: #666;
  line-height: 1.8;
}

.article-body ul, .article-body ol {
  margin: 16px 0 16px 24px;
  color: #666;
}

.article-body li {
  margin-bottom: 8px;
  line-height: 1.6;
}

.inline-cta {
  background: linear-gradient(135deg, #e0f2fe 0%, #ccfbf1 100%);
  border-left: 4px solid #0ea5e9;
  padding: 20px;
  border-radius: 8px;
  margin: 24px 0;
}

.inline-cta p {
  margin-bottom: 12px;
  color: #1a1a1a;
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.sbox {
  background: white;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  position: sticky;
  top: 80px;
}

.sbox h4 {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 12px;
  color: #1a1a1a;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.sbox-item {
  margin-bottom: 8px;
}

.sbox-item a {
  color: #0ea5e9;
  text-decoration: none;
  font-size: 13px;
  display: block;
  padding: 6px 0;
  transition: all 0.3s ease;
}

.sbox-item a:hover {
  color: #06b6d4;
  padding-left: 4px;
}

.stoc {
  max-height: 400px;
  overflow-y: auto;
}

.stoc a {
  font-size: 13px;
  color: #666;
}

.stoc a:hover {
  color: #0ea5e9;
}

.sstat {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.sstat-item {
  text-align: center;
  padding: 12px;
  background: #f9fafb;
  border-radius: 8px;
}

.sstat-num {
  font-size: 18px;
  font-weight: 700;
  color: #0ea5e9;
  display: block;
}

.sstat-label {
  font-size: 11px;
  color: #666;
  margin-top: 4px;
}

.cta-box {
  background: linear-gradient(135deg, #0ea5e9 0%, #06b6d4 100%);
  color: white;
  padding: 20px;
  border-radius: 12px;
  text-align: center;
}

.cta-box p {
  margin-bottom: 12px;
  font-size: 14px;
}

.cta-box a {
  display: inline-block;
  background: white;
  color: #0ea5e9;
  padding: 8px 16px;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
  font-size: 13px;
  transition: all 0.3s ease;
}

.cta-box a:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* ===== Footer ===== */
.site-footer {
  background: #1a1a1a;
  color: #ccc;
  padding: 40px 20px;
  text-align: center;
  font-size: 13px;
  line-height: 1.8;
}

.footer-brand {
  font-size: 14px;
  font-weight: 600;
  color: white;
  margin-bottom: 12px;
}

.security-line {
  color: #fbbf24;
  font-weight: 500;
  margin: 12px 0;
}

.footer-note {
  color: #999;
  font-size: 12px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid #333;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .nav-inner {
    padding: 0 12px;
  }

  .navlist a {
    padding: 16px 12px;
    font-size: 13px;
  }

  .hero-title {
    font-size: 28px;
  }

  .sec-title {
    font-size: 24px;
  }

  .feature-grid, .plat-strip, .reviews-grid, .guide-steps, .req-grid, .other-plats {
    grid-template-columns: 1fr;
  }

  .article-layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    order: -1;
  }

  .sbox {
    position: static;
  }

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

  .btn {
    width: 100%;
  }

  .cmp-table {
    font-size: 12px;
  }

  .cmp-table th, .cmp-table td {
    padding: 10px 8px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 22px;
  }

  .sec-title {
    font-size: 20px;
  }

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

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

  .navlist {
    gap: 0;
  }

  .navlist a {
    padding: 16px 10px;
    font-size: 12px;
  }
}