@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;700;900&family=Noto+Sans+SC:wght@400;500;600;700&display=swap');

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

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: #eef1f7;
  color: #111;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  background-image: radial-gradient(circle at 20% -10%, rgba(48, 115, 255, 0.15), transparent 35%);
}

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

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 48px;
  background: #fff;
  position: sticky;
  top: 0;
  z-index: 100;
  transition: box-shadow 0.3s;
}

.navbar.scrolled { box-shadow: 0 1px 12px rgba(0,0,0,0.06); }

.logo {
  font-family: 'Noto Sans SC', sans-serif;
  font-weight: 900;
  font-size: 20px;
  letter-spacing: -0.5px;
  color: #3073ff;
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-icon { width: 28px; height: 28px; border-radius: 6px; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
  list-style: none;
}

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: #333;
  transition: color 0.2s;
}

.nav-links a:hover { color: #3073ff; }

.btn-start {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border: 1.5px solid #3073ff;
  border-radius: 50px;
  background: transparent;
  font-size: 14px;
  font-weight: 600;
  color: #3073ff;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
  white-space: nowrap;
  line-height: 1.4;
}

.btn-start::before {
  content: '↓';
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border: 1.5px solid currentColor;
  border-radius: 50%;
  font-size: 13px;
  flex-shrink: 0;
  transition: transform 0.2s;
}

.btn-start:hover { background: #3073ff; color: #fff; }
.btn-start:hover::before { transform: translateY(2px); }

.hero {
  position: relative;
  background: #fff;
  padding: 64px 48px 88px;
  overflow: hidden;
  min-height: 540px;
}

.hero-gradient {
  position: absolute;
  top: -80px;
  right: -120px;
  width: 720px;
  height: 720px;
  background:
    radial-gradient(ellipse at 60% 40%, rgba(48, 115, 255, 0.35) 0%, rgba(80, 140, 255, 0.2) 25%, rgba(48, 115, 255, 0.1) 45%, transparent 70%),
    radial-gradient(ellipse at 40% 60%, rgba(100, 160, 255, 0.2) 0%, rgba(48, 115, 255, 0.08) 40%, transparent 65%);
  filter: blur(40px);
  pointer-events: none;
  z-index: 1;
}

.hero-content { position: relative; z-index: 2; }
.hero-kicker {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 2px;
  color: #3073ff;
  border: 1px solid rgba(48, 115, 255, 0.3);
  border-radius: 999px;
  padding: 7px 12px;
  margin-bottom: 18px;
  background: rgba(48, 115, 255, 0.06);
}
.hero-trust {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: -12px 0 28px;
}
.hero-trust span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid #d9e3f3;
  border-radius: 999px;
  background: rgba(48, 115, 255, 0.04);
  font-size: 12px;
  color: #444;
}

.hero-title {
  font-family: 'Noto Serif SC', serif;
  font-size: clamp(44px, 6.5vw, 80px);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -1px;
  max-width: 780px;
  margin-bottom: 52px;
}

.hero-title .highlight {
  display: inline-block;
  padding: 0 14px;
  border: 2.5px solid #3073ff;
  border-radius: 8px;
  background: rgba(48, 115, 255, 0.05);
  color: #3073ff;
}

.hero-bottom { display: flex; align-items: flex-end; gap: 60px; }

.social-sidebar { display: flex; flex-direction: column; align-items: center; gap: 14px; }

.social-handle {
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  font-size: 12px;
  font-weight: 500;
  color: #3073ff;
  letter-spacing: 1px;
  margin-bottom: 4px;
}

.social-icon { width: 20px; height: 20px; display: flex; align-items: center; justify-content: center; color: #3073ff; }
.social-icon svg { width: 18px; height: 18px; }
.social-line { width: 1.5px; height: 32px; background: #3073ff; }

.hero-info { max-width: 440px; }

.hero-desc { font-size: 15px; line-height: 1.8; color: #555; margin-bottom: 32px; }

.hero-btns { display: flex; gap: 12px; flex-wrap: wrap; }

.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  border: 1.5px solid #3073ff;
  border-radius: 50px;
  background: #3073ff;
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  white-space: nowrap;
  line-height: 1.4;
}

.btn-download::before {
  content: '↓';
  display: flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border: 1.5px solid rgba(255,255,255,0.4);
  border-radius: 50%;
  font-size: 13px;
  flex-shrink: 0;
}

.btn-download:hover { background: #2560db; transform: translateY(-1px); }

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  border: 1.5px solid #3073ff;
  border-radius: 50px;
  background: transparent;
  font-size: 14px;
  font-weight: 600;
  color: #3073ff;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}

.btn-outline:hover { background: #3073ff; color: #fff; }

.dark-section {
  background: #111;
  color: #fff;
  padding: 80px 48px 100px;
  position: relative;
}

.dark-section::before {
  content: '';
  position: absolute;
  top: -2px;
  right: 0;
  width: 50%;
  height: 60px;
  background: linear-gradient(to right, transparent, rgba(48, 115, 255, 0.25), rgba(80, 140, 255, 0.4));
  filter: blur(20px);
  pointer-events: none;
}

.dark-section-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 40px;
  margin-bottom: 64px;
}

.badge-row { display: flex; align-items: center; gap: 12px; margin-bottom: 24px; }

.badge-arrow {
  width: 36px;
  height: 36px;
  border: 1.5px solid rgba(255,255,255,0.3);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 14px;
}

.badge {
  display: inline-block;
  padding: 6px 16px;
  border: 1px solid rgba(255,255,255,0.25);
  border-radius: 50px;
  font-size: 13px;
  font-weight: 500;
  color: #fff;
}

.dark-title {
  font-family: 'Noto Serif SC', serif;
  font-size: clamp(32px, 4.5vw, 52px);
  font-weight: 900;
  line-height: 1.2;
  max-width: 500px;
}

.dark-desc {
  max-width: 380px;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(255,255,255,0.6);
  padding-top: 60px;
}

.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }

.feature-card {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 16px;
  padding: 32px 28px;
  transition: border-color 0.3s, background 0.3s;
}

.feature-card:hover { border-color: rgba(48, 115, 255, 0.4); background: rgba(255,255,255,0.08); }
.feature-card { backdrop-filter: blur(2px); }
.feature-card .card-icon { font-size: 28px; margin-bottom: 18px; }
.feature-card h3 { font-size: 17px; font-weight: 700; margin-bottom: 10px; color: #fff; }
.feature-card p { font-size: 13px; line-height: 1.7; color: rgba(255,255,255,0.55); }

.download-section {
  background: #f7f8fc;
  padding: 100px 48px;
  position: relative;
  overflow: hidden;
}

.download-section .section-gradient {
  position: absolute;
  bottom: -100px;
  left: -100px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(48, 115, 255, 0.15) 0%, transparent 60%);
  filter: blur(60px);
  pointer-events: none;
}

.download-header { text-align: center; margin-bottom: 56px; position: relative; z-index: 2; }

.download-header h2 {
  font-family: 'Noto Serif SC', serif;
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 900;
  margin-bottom: 16px;
}

.download-header p {
  font-size: 15px;
  color: #666;
  max-width: 580px;
  margin: 0 auto;
  line-height: 1.7;
}
.download-notice {
  margin-top: 18px;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
}
.download-notice span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid #d4ddf0;
  background: #fff;
  font-size: 12px;
  color: #666;
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  max-width: 900px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.dl-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 24px 28px;
  background: #fff;
  border: 1.5px solid #e0e5ef;
  border-radius: 16px;
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.15s;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.dl-card:hover { border-color: #3073ff; box-shadow: 0 4px 20px rgba(48, 115, 255, 0.12); transform: translateY(-2px); }
.dl-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(110deg, transparent 0%, rgba(255,255,255,0.6) 40%, transparent 80%);
  transform: translateX(-120%);
  transition: transform 0.7s ease;
  pointer-events: none;
}
.dl-card:hover::after { transform: translateX(120%); }
.dl-card .dl-icon { width: 44px; height: 44px; display: flex; align-items: center; justify-content: center; background: rgba(48, 115, 255, 0.08); border-radius: 12px; flex-shrink: 0; }
.dl-card .dl-icon svg { width: 24px; height: 24px; color: #3073ff; }
.dl-card .dl-icon i { font-size: 22px; color: #3073ff; }
.dl-card .dl-info { flex: 1; }
.dl-card .os-name { display: block; font-size: 15px; font-weight: 700; color: #111; margin-bottom: 2px; }
.dl-card .os-ver { display: block; font-size: 12px; color: #888; }
.dl-card .dl-arrow { font-size: 18px; color: #999; transition: transform 0.2s; }
.dl-card:hover .dl-arrow { transform: translateY(2px); color: #3073ff; }
.dl-card .dl-item-info { flex: 1; }
.dl-card .dl-item-name { font-size: 15px; font-weight: 700; color: #111; margin-bottom: 2px; }
.dl-card .dl-item-meta { font-size: 12px; color: #888; }
.dl-card .dl-item-tag {
  display: inline-flex;
  margin-top: 8px;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 11px;
  color: #1a4fb0;
  background: rgba(48, 115, 255, 0.1);
}
.dl-card > .fa-download { font-size: 16px; color: #999; transition: color 0.2s, transform 0.2s; }
.dl-card:hover > .fa-download { color: #3073ff; transform: translateY(1px); }
.download-tip {
  text-align: center;
  margin-top: 20px;
  font-size: 12px;
  color: #888;
}

.stats-bar { background: #111; padding: 48px; }
.stats-grid { display: flex; justify-content: center; gap: 80px; }
.stat-item { text-align: center; }
.stat-item .num { font-family: 'Noto Serif SC', serif; font-size: 36px; font-weight: 900; color: #fff; line-height: 1; margin-bottom: 8px; }
.stat-item .num .accent { color: rgba(48, 145, 255, 0.9); }
.stat-item .label { font-size: 13px; color: rgba(255,255,255,0.5); }

.brand-strip {
  background: #111;
  padding: 16px 48px;
  border-top: 1px solid rgba(255,255,255,0.08);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.brand-strip-inner {
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
  color: rgba(255,255,255,0.78);
  font-size: 13px;
}
.brand-strip-inner span {
  padding: 6px 12px;
  border: 1px solid rgba(255,255,255,0.16);
  border-radius: 999px;
}

.timeline-section {
  background: linear-gradient(180deg, #f7f8fc 0%, #f0f2f8 100%);
  padding: 80px 48px;
}
.timeline-wrap {
  max-width: 1080px;
  margin: 0 auto;
}
.timeline-wrap h2 {
  font-family: 'Noto Serif SC', serif;
  font-size: clamp(28px, 3.5vw, 42px);
  margin-bottom: 28px;
}
.timeline-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.timeline-item {
  background: #fff;
  border: 1px solid #e0e5ef;
  border-radius: 16px;
  padding: 24px;
}
.timeline-no {
  display: inline-flex;
  font-weight: 800;
  color: #3073ff;
  background: rgba(48, 115, 255, 0.08);
  border-radius: 999px;
  padding: 2px 10px;
  margin-bottom: 12px;
}
.timeline-item h3 { font-size: 18px; margin-bottom: 8px; }
.timeline-item p { font-size: 14px; color: #666; line-height: 1.8; }

.final-cta {
  background: #111;
  padding: 72px 48px;
}
.final-cta-card {
  max-width: 980px;
  margin: 0 auto;
  background: linear-gradient(135deg, #1a1a1a 0%, #242424 70%);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 24px;
  padding: 40px;
  color: #fff;
}
.final-cta-card h2 {
  font-family: 'Noto Serif SC', serif;
  font-size: clamp(28px, 3vw, 40px);
  margin-bottom: 12px;
}
.final-cta-card p { color: rgba(255,255,255,0.7); margin-bottom: 20px; }
.final-cta-actions { display: flex; gap: 12px; flex-wrap: wrap; }

.blog-section { background: #f7f8fc; padding: 80px 48px; }

.blog-header { display: flex; align-items: flex-end; justify-content: space-between; margin-bottom: 40px; }

.blog-header h2 {
  font-family: 'Noto Serif SC', serif;
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 900;
}

.blog-header .view-all { font-size: 14px; font-weight: 500; color: #3073ff; border-bottom: 1px solid rgba(48, 115, 255, 0.3); padding-bottom: 2px; transition: color 0.2s; }
.blog-header .view-all:hover { color: #2560db; }
.blog-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }

.blog-card {
  background: #fff;
  border-radius: 16px;
  padding: 28px;
  border: 1px solid #e0e5ef;
  transition: box-shadow 0.2s, transform 0.15s;
}

.blog-card:hover { box-shadow: 0 4px 20px rgba(48, 115, 255, 0.08); transform: translateY(-2px); }
.blog-card .blog-date { font-size: 12px; color: #999; margin-bottom: 12px; }
.blog-card h3 { font-size: 16px; font-weight: 700; line-height: 1.5; margin-bottom: 10px; color: #111; }
.blog-card p { font-size: 13px; line-height: 1.7; color: #777; margin-bottom: 16px; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.blog-card .blog-link { font-size: 13px; font-weight: 600; color: #3073ff; transition: opacity 0.2s; }
.blog-card .blog-link:hover { opacity: 0.6; }

.seo-section { background: #fff; padding: 80px 48px; }
.seo-section .seo-header { text-align: center; margin-bottom: 48px; }
.seo-section .seo-header h2 { font-family: 'Noto Serif SC', serif; font-size: 28px; font-weight: 900; margin-bottom: 12px; }
.seo-section .seo-header p { font-size: 14px; color: #888; }
.seo-articles { max-width: 800px; margin: 0 auto; }

.seo-article { margin-bottom: 56px; padding-bottom: 56px; border-bottom: 1px solid #eee; }
.seo-article:last-child { border-bottom: none; margin-bottom: 0; }
.seo-article h2 { font-family: 'Noto Serif SC', serif; font-size: 22px; font-weight: 900; margin-bottom: 24px; line-height: 1.4; }
.seo-article h3 { font-size: 17px; font-weight: 700; margin: 28px 0 12px; color: #111; }
.seo-article h4 { font-size: 15px; font-weight: 600; margin: 20px 0 8px; color: #333; }
.seo-article p { font-size: 14px; line-height: 1.9; color: #555; margin-bottom: 12px; }
.seo-article ul, .seo-article ol { padding-left: 20px; margin-bottom: 16px; }
.seo-article li { font-size: 14px; line-height: 1.8; color: #555; margin-bottom: 4px; }
.seo-article dt { font-size: 14px; font-weight: 700; color: #333; margin: 12px 0 4px; }
.seo-article dd { font-size: 14px; line-height: 1.8; color: #555; margin-bottom: 8px; margin-left: 0; }

.site-footer { background: #111; color: #fff; padding: 64px 48px 32px; }
.footer-top { display: flex; justify-content: space-between; gap: 40px; margin-bottom: 48px; }
.footer-brand .brand-text { font-family: 'Noto Sans SC', sans-serif; font-size: 20px; font-weight: 900; display: block; margin-bottom: 8px; color: #fff; }
.footer-brand p { font-size: 13px; color: rgba(255,255,255,0.4); }
.footer-nav { display: flex; gap: 64px; }
.footer-col h4 { font-size: 13px; font-weight: 700; margin-bottom: 16px; color: rgba(255,255,255,0.9); }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 10px; }
.footer-col a { font-size: 13px; color: rgba(255,255,255,0.45); transition: color 0.2s; }
.footer-col a:hover { color: rgba(255,255,255,0.8); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); padding-top: 24px; font-size: 12px; color: rgba(255,255,255,0.3); line-height: 1.6; }

.download-fallback-toast {
  position: fixed;
  left: 50%;
  bottom: 26px;
  transform: translateX(-50%) translateY(18px);
  background: rgba(17,17,17,0.92);
  color: #fff;
  font-size: 13px;
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid rgba(255,255,255,0.18);
  box-shadow: 0 10px 28px rgba(0,0,0,0.24);
  opacity: 0;
  pointer-events: none;
  z-index: 9999;
  transition: opacity 0.2s ease, transform 0.2s ease;
}
.download-fallback-toast.is-show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}
.download-fallback-toast.is-warning {
  background: rgba(76, 58, 18, 0.95);
  border-color: rgba(255, 215, 64, 0.42);
}

@media (max-width: 1024px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .blog-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { gap: 40px; }
  .timeline-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .navbar { padding: 16px 24px; }
  .nav-links { display: none; }
  .hero { padding: 40px 24px 60px; }
  .hero-title { font-size: 36px; }
  .hero-trust { margin-bottom: 20px; }
  .hero-bottom { flex-direction: column; align-items: flex-start; gap: 32px; }
  .social-sidebar { flex-direction: row; }
  .social-handle { writing-mode: horizontal-tb; transform: none; }
  .social-line { width: 32px; height: 1.5px; }
  .dark-section { padding: 48px 24px 64px; }
  .brand-strip { padding: 14px 24px; }
  .dark-section-header { flex-direction: column; }
  .dark-desc { padding-top: 0; }
  .feature-grid { grid-template-columns: 1fr; }
  .download-section { padding: 60px 24px; }
  .download-grid { grid-template-columns: 1fr; }
  .download-notice { justify-content: flex-start; }
  .stats-grid { flex-direction: column; gap: 24px; }
  .blog-section { padding: 48px 24px; }
  .blog-grid { grid-template-columns: 1fr; }
  .blog-header { flex-direction: column; gap: 12px; align-items: flex-start; }
  .seo-section { padding: 48px 24px; }
  .timeline-section { padding: 52px 24px; }
  .final-cta { padding: 48px 24px; }
  .final-cta-card { padding: 28px 22px; }
  .site-footer { padding: 40px 24px 24px; }
  .download-fallback-toast { bottom: 18px; width: calc(100% - 32px); text-align: center; }
  .footer-top { flex-direction: column; }
  .footer-nav { flex-wrap: wrap; gap: 32px; }
  .hero-btns { flex-direction: column; }
}