* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
}

body {
  background: #f6f9fc;
  color: #1e293b;
  line-height: 1.5;
  scroll-behavior: smooth;
  padding: 0 1.5rem;
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.2rem 0 0;
}

/* Navigation — pill-shaped frosted glass */
nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  padding: 0.4rem 0.8rem;
  background: rgba(255,255,255,0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-radius: 60px;
  box-shadow: 0 12px 30px -12px rgba(0,0,0,0.08);
  margin-bottom: 2.5rem;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-area img {
  height: 44px;
  width: auto;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.02);
  transition: transform 0.25s ease;
}

.logo-area img:hover { transform: scale(1.02); }

.logo-area .logo-text {
  font-weight: 600;
  font-size: 1.2rem;
  letter-spacing: -0.3px;
  color: #1e293b;
}

.nav-links {
  display: flex;
  gap: 2.2rem;
  flex-wrap: wrap;
  align-items: center;
}

.nav-links a {
  text-decoration: none;
  font-weight: 500;
  font-size: 1rem;
  color: #1e293b;
  transition: 0.2s;
  border-radius: 30px;
  padding: 0.4rem 0.2rem;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 2.5px;
  background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  border-radius: 4px;
  transition: 0.3s;
}

.nav-links a:hover { color: #f5576c; }
.nav-links a:hover::after { width: 100%; }

.nav-download-btn {
  background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%) !important;
  color: #fff !important;
  padding: 0.5rem 1.8rem !important;
  border-radius: 40px !important;
  font-weight: 600 !important;
  box-shadow: 0 10px 20px -8px rgba(79, 172, 254, 0.4);
  transition: 0.2s;
  text-decoration: none;
  font-size: 1rem;
}

.nav-download-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 28px -8px #4facfe;
}

.nav-download-btn::after { display: none !important; }

/* Hero — pastel multi-color gradient */
.hero-gradient {
  background: linear-gradient(135deg, #fbc2eb 0%, #a6c1ee 50%, #84fab0 100%);
  padding: 3.2rem 2.5rem;
  border-radius: 56px;
  text-align: center;
  box-shadow: 0 30px 50px -20px rgba(0,0,0,0.15);
  margin-bottom: 3rem;
  transition: all 0.2s;
}

.hero-gradient h2 {
  font-size: 2.8rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #1e1e2f, #2d2d44);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.75rem;
}

.hero-gradient p {
  font-size: 1.25rem;
  color: #1e293b;
  opacity: 0.8;
  max-width: 600px;
  margin: 0 auto 1.8rem;
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
}

.download-btn {
  display: inline-block;
  padding: 0.9rem 3.2rem;
  border-radius: 60px;
  font-weight: 600;
  font-size: 1.1rem;
  color: #fff;
  text-decoration: none;
  box-shadow: 0 18px 28px -12px rgba(0,0,0,0.2);
  transition: 0.2s;
  border: none;
  cursor: pointer;
  background: linear-gradient(145deg, #2d2d44, #1a1a2e);
}

.download-btn:hover { transform: scale(1.02) translateY(-4px); box-shadow: 0 28px 36px -14px #1e293b; }

.download-btn.primary {
  background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  color: #fff;
}

.download-btn.secondary {
  background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  color: #fff;
}

.download-btn.tertiary {
  background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
  color: #1e293b;
}

/* Stat cards */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 2rem;
  margin: 3rem 0;
}

.stat-card {
  background: rgba(255,255,255,0.6);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  padding: 1.8rem 1rem;
  border-radius: 40px;
  box-shadow: 0 20px 40px -16px rgba(0,0,0,0.06);
  text-align: center;
  border: 1px solid rgba(255,255,255,0.5);
  transition: 0.25s ease;
}

.stat-card:hover { transform: translateY(-8px); box-shadow: 0 30px 48px -18px rgba(0,0,0,0.12); }

.stat-card .number {
  font-size: 2.6rem;
  font-weight: 700;
  background: linear-gradient(135deg, #f093fb, #f5576c);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-card .label { font-size: 1rem; opacity: 0.7; margin-top: 0.4rem; letter-spacing: 0.02em; }

/* Intro card */
.intro-card {
  background: #fff;
  border-radius: 48px;
  padding: 2.2rem 2.5rem;
  box-shadow: 0 20px 40px -14px rgba(0,0,0,0.04);
  margin: 2.2rem 0 2.8rem;
  border: 1px solid rgba(255,255,255,0.6);
}

.intro-card h3 { font-size: 1.8rem; font-weight: 600; margin-bottom: 0.6rem; display: flex; align-items: center; gap: 8px; }

.intro-card h3 span {
  background: linear-gradient(135deg, #f093fb, #f5576c);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.intro-card p { font-size: 1.05rem; opacity: 0.85; max-width: 750px; }

/* Features grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2rem;
  margin: 3rem 0;
}

.feature-item {
  background: rgba(255,255,255,0.7);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  padding: 1.8rem 1.5rem;
  border-radius: 36px;
  box-shadow: 0 12px 28px -12px rgba(0,0,0,0.04);
  border: 1px solid rgba(255,255,255,0.6);
  transition: 0.2s;
}

.feature-item:hover { transform: scale(1.01); background: #fff; }

.feature-item h4 { font-size: 1.4rem; font-weight: 600; margin-bottom: 0.6rem; }

.feature-item p { font-size: 0.98rem; opacity: 0.8; line-height: 1.6; }

/* Category grid */
.section-heading {
  font-weight: 600;
  font-size: 1.6rem;
  margin: 2.5rem 0 1.2rem;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1.6rem;
  margin: 1rem 0 3rem;
}

.category-card {
  background: #fff;
  padding: 1.5rem 0.8rem;
  border-radius: 40px;
  text-align: center;
  box-shadow: 0 12px 28px -10px rgba(0,0,0,0.02);
  border: 1px solid #f0f4f9;
  transition: 0.2s;
}

.category-card:hover { transform: translateY(-5px); box-shadow: 0 24px 40px -16px rgba(0,0,0,0.08); }

.category-card img { width: 48px; height: 48px; border-radius: 20px; margin-bottom: 0.6rem; object-fit: cover; background: #eef2f6; }

.category-card .cat-name { font-weight: 600; }

.category-card .cat-desc { font-size: 0.8rem; opacity: 0.7; margin-top: 4px; }

/* FAQ section */
.faq-section {
  margin: 3.5rem 0 2.5rem;
}

.faq-item {
  background: #fff;
  border-radius: 32px;
  padding: 1.6rem 2rem;
  margin-bottom: 1.4rem;
  box-shadow: 0 8px 22px -10px rgba(0,0,0,0.02);
  border: 1px solid #f0f4fa;
}

.faq-item h4 { font-size: 1.2rem; font-weight: 600; margin-bottom: 0.4rem; color: #0b1a2b; }

.faq-item p { opacity: 0.85; font-size: 0.98rem; line-height: 1.7; }

.faq-item ol { padding-left: 1.6rem; margin: 0.6rem 0 0.2rem; }

.faq-item ol li { margin-bottom: 0.2rem; opacity: 0.85; font-size: 0.95rem; }

/* Guide steps */
.guide-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.6rem;
  margin: 1rem 0 2.5rem;
}

.guide-card {
  background: #fff;
  border-radius: 40px;
  padding: 1.5rem 1rem;
  text-align: center;
  border: 1px solid #edf2f7;
  transition: 0.2s;
}

.guide-card:hover { background: #fafcff; transform: translateY(-3px); }

.guide-card .step-num {
  font-size: 2.2rem;
  font-weight: 700;
  background: linear-gradient(135deg, #4facfe, #00f2fe);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.guide-card .step-title { font-weight: 600; margin-top: 0.3rem; }

.guide-card .step-desc { font-size: 0.9rem; opacity: 0.7; margin-top: 0.2rem; }

/* Article pages */
.article-page { margin: 2rem 0 3rem; }

.article-page h1 {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, #1e1e2f, #2d2d44);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.article-page .article-date { font-size: 0.9rem; color: #94a3b8; margin-bottom: 2rem; }

.article-card {
  background: #fff;
  border-radius: 40px;
  padding: 2.5rem 2.8rem;
  box-shadow: 0 12px 32px -12px rgba(0,0,0,0.04);
  border: 1px solid #f0f4f9;
}

.article-card h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 2rem 0 0.8rem;
  color: #1e293b;
}

.article-card h2:first-child { margin-top: 0; }

.article-card p {
  font-size: 1.02rem;
  line-height: 1.8;
  color: #334155;
  margin-bottom: 1rem;
}

.article-card ul, .article-card ol {
  padding-left: 1.8rem;
  margin: 0.8rem 0 1.2rem;
  color: #334155;
}

.article-card li {
  font-size: 1rem;
  margin-bottom: 0.4rem;
  line-height: 1.7;
}

.article-card strong { color: #1e293b; }

.breadcrumb {
  padding: 0.5rem 0;
  font-size: 0.95rem;
  color: #94a3b8;
  margin-bottom: 1rem;
}

.breadcrumb a { color: #64748b; text-decoration: none; }

.breadcrumb a:hover { color: #f5576c; }

/* Download page cards */
.download-page { margin: 2rem 0 3rem; }

.download-page h1 {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.download-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.8rem;
  margin: 2rem 0;
}

.download-card-item {
  background: #fff;
  border-radius: 36px;
  padding: 2rem 1.5rem;
  text-align: center;
  box-shadow: 0 12px 28px -10px rgba(0,0,0,0.03);
  border: 1px solid #f0f4f9;
  transition: 0.2s;
}

.download-card-item:hover { transform: translateY(-4px); box-shadow: 0 20px 36px -14px rgba(0,0,0,0.08); }

.download-card-item .d-icon { font-size: 3rem; margin-bottom: 0.8rem; }

.download-card-item h3 { font-size: 1.2rem; font-weight: 600; margin-bottom: 0.4rem; }

.download-card-item p { font-size: 0.92rem; opacity: 0.75; margin-bottom: 1.2rem; line-height: 1.6; }

.download-info-card {
  background: #fff;
  border-radius: 40px;
  padding: 2.5rem 2.8rem;
  box-shadow: 0 12px 32px -12px rgba(0,0,0,0.04);
  border: 1px solid #f0f4f9;
  margin: 2rem 0;
}

.download-info-card h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 1.8rem 0 0.8rem;
  color: #1e293b;
}

.download-info-card h2:first-child { margin-top: 0; }

.download-info-card p {
  font-size: 1rem;
  line-height: 1.8;
  color: #475569;
  margin-bottom: 0.8rem;
}

/* 404 page */
.error-section {
  text-align: center;
  padding: 5rem 0;
}

.error-section .err-num {
  font-size: 7rem;
  font-weight: 800;
  background: linear-gradient(135deg, #f093fb, #f5576c);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.1;
}

.error-section h2 { font-size: 1.6rem; margin: 1rem 0 0.5rem; }

.error-section p { opacity: 0.7; margin-bottom: 2rem; font-size: 1.05rem; }

/* Sitemap page */
.sitemap-section {
  margin: 2rem 0 3rem;
}

.sitemap-section h1 {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 2rem;
  background: linear-gradient(135deg, #1e1e2f, #2d2d44);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.sitemap-col {
  background: #fff;
  border-radius: 36px;
  padding: 2rem 2.2rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 8px 24px -10px rgba(0,0,0,0.03);
  border: 1px solid #f0f4f9;
}

.sitemap-col h2 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 1rem;
  display: inline-block;
  padding-bottom: 0.4rem;
  border-bottom: 3px solid;
  border-image: linear-gradient(135deg, #f093fb, #f5576c) 1;
}

.sitemap-col ul { list-style: none; }

.sitemap-col li { padding: 0.5rem 0; }

.sitemap-col a {
  color: #475569;
  text-decoration: none;
  font-size: 0.98rem;
  transition: 0.2s;
}

.sitemap-col a:hover { color: #f5576c; }

/* Footer */
.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 2rem;
  background: #fff;
  border-radius: 48px 48px 28px 28px;
  padding: 2.5rem 2.2rem;
  margin: 2.8rem 0 1.2rem;
  box-shadow: 0 -4px 20px rgba(0,0,0,0.02);
}

.footer-col { flex: 1 1 160px; }

.footer-col h5 { font-weight: 600; margin-bottom: 0.8rem; font-size: 1rem; }

.footer-col ul { list-style: none; }

.footer-col ul li { margin-bottom: 0.4rem; opacity: 0.7; font-size: 0.9rem; }

.footer-col ul li a { text-decoration: none; color: inherit; }

.footer-col ul li a:hover { color: #f5576c; }

.copyright {
  text-align: center;
  padding: 1.2rem 0.5rem;
  font-size: 0.9rem;
  color: #2d3a4f;
  opacity: 0.7;
  border-top: 1px solid rgba(0,0,0,0.02);
  margin-top: 0.5rem;
}

/* Responsive */
@media (max-width: 768px) {
  body { padding: 0 0.8rem; }

  nav { border-radius: 40px; padding: 0.6rem 1rem; }

  .nav-links { gap: 1.2rem; }

  .hero-gradient { padding: 2.2rem 1.5rem; border-radius: 36px; }

  .hero-gradient h2 { font-size: 2rem; }

  .hero-gradient p { font-size: 1.05rem; }

  .download-btn { padding: 0.8rem 2rem; font-size: 1rem; }

  .intro-card { padding: 1.5rem 1.5rem; border-radius: 32px; }

  .article-card, .download-info-card { padding: 1.5rem; border-radius: 28px; }

  .article-page h1 { font-size: 1.6rem; }

  .footer-links { border-radius: 32px 32px 20px 20px; padding: 1.8rem 1.5rem; }
}

@media (max-width: 480px) {
  body { padding: 0 0.5rem; }

  nav { border-radius: 32px; padding: 0.5rem 0.8rem; }

  .nav-links { gap: 0.8rem; }

  .nav-links a { font-size: 0.85rem; }

  .nav-download-btn { padding: 0.4rem 1rem !important; font-size: 0.85rem !important; }

  .logo-area img { height: 34px; }

  .logo-area .logo-text { font-size: 1rem; }

  .hero-gradient { padding: 1.8rem 1rem; border-radius: 28px; }

  .hero-gradient h2 { font-size: 1.5rem; }

  .hero-gradient p { font-size: 0.95rem; }

  .btn-group { gap: 0.6rem; }

  .download-btn { padding: 0.7rem 1.4rem; font-size: 0.9rem; }

  .intro-card, .article-card, .download-info-card { padding: 1.2rem; border-radius: 24px; }

  .intro-card h3 { font-size: 1.3rem; }

  .stat-card .number { font-size: 2rem; }

  .section-heading { font-size: 1.3rem; }

  .features-grid { grid-template-columns: 1fr; gap: 1.2rem; }

  .article-page h1 { font-size: 1.4rem; }

  .error-section .err-num { font-size: 5rem; }

  .footer-links { gap: 1.2rem; }
}