/* 球友会官网 - 完整样式文件 */
* { margin: 0; padding: 0; box-sizing: border-box; }
:root { 
  --primary: #1a3a5c; 
  --primary-light: #2a5a8c; 
  --primary-dark: #0f2440; 
  --accent: #e8a838; 
  --accent-light: #f0c060; 
  --bg: #f5f7fa; 
  --bg-card: #ffffff; 
  --text: #1a1a2e; 
  --text-light: #5a5a7a; 
  --border: #e0e4ea; 
  --glass: rgba(255,255,255,0.7); 
  --shadow: 0 8px 32px rgba(0,0,0,0.08); 
  --radius: 16px; 
  --radius-sm: 8px; 
  --transition: 0.3s ease; 
}
[data-theme="dark"] { 
  --primary: #2a5a8c; 
  --primary-light: #4a7aac; 
  --primary-dark: #1a3a5c; 
  --accent: #f0c060; 
  --accent-light: #f8d880; 
  --bg: #121212; 
  --bg-card: #1e1e2e; 
  --text: #e0e0f0; 
  --text-light: #a0a0c0; 
  --border: #2a2a3e; 
  --glass: rgba(30,30,46,0.8); 
  --shadow: 0 8px 32px rgba(0,0,0,0.4); 
}
html { scroll-behavior: smooth; }
body { 
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; 
  background: var(--bg); 
  color: var(--text); 
  line-height: 1.7; 
  transition: background var(--transition), color var(--transition); 
  overflow-x: hidden; 
}
a { color: var(--primary-light); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent); }
img, svg { max-width: 100%; height: auto; display: block; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header { 
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000; 
  background: var(--glass); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); 
  border-bottom: 1px solid var(--border); 
  transition: background var(--transition), border var(--transition); 
}
.header-inner { 
  display: flex; align-items: center; justify-content: space-between; 
  height: 72px; padding: 0 20px; max-width: 1240px; margin: 0 auto; 
}
.logo { display: flex; align-items: center; gap: 10px; }
.logo svg { width: 40px; height: 40px; }
.logo-text { font-size: 1.5rem; font-weight: 700; color: var(--primary); letter-spacing: 1px; }
.nav-menu { display: flex; gap: 28px; list-style: none; }
.nav-menu a { 
  color: var(--text); font-size: 0.95rem; font-weight: 500; padding: 8px 0; 
  position: relative; transition: color var(--transition); 
}
.nav-menu a::after { 
  content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 2px; 
  background: var(--accent); transition: width var(--transition); 
}
.nav-menu a:hover, .nav-menu a.active { color: var(--accent); }
.nav-menu a:hover::after, .nav-menu a.active::after { width: 100%; }
.header-actions { display: flex; align-items: center; gap: 16px; }
.theme-toggle { 
  background: none; border: 2px solid var(--border); border-radius: 50%; width: 40px; height: 40px; 
  display: flex; align-items: center; justify-content: center; cursor: pointer; 
  color: var(--text); font-size: 1.2rem; transition: all var(--transition); 
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }
.mobile-menu-btn { display: none; background: none; border: none; font-size: 1.8rem; color: var(--text); cursor: pointer; padding: 4px; }
@media (max-width: 900px) {
  .nav-menu { 
    display: none; position: absolute; top: 72px; left: 0; right: 0; 
    background: var(--bg-card); flex-direction: column; padding: 20px; gap: 12px; 
    box-shadow: var(--shadow); border-bottom: 1px solid var(--border); 
  }
  .nav-menu.open { display: flex; }
  .mobile-menu-btn { display: block; }
}

/* Hero Banner */
.hero { 
  padding: 120px 0 80px; 
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%); 
  position: relative; overflow: hidden; 
}
.hero::before { 
  content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%; 
  background: radial-gradient(circle at 30% 40%, rgba(232,168,56,0.15) 0%, transparent 60%); 
  animation: heroGlow 8s ease-in-out infinite alternate; 
}
@keyframes heroGlow { 0% { transform: translate(0,0); } 100% { transform: translate(5%,5%); } }
.hero-content { position: relative; z-index: 2; display: flex; align-items: center; gap: 60px; flex-wrap: wrap; }
.hero-text { flex: 1; min-width: 280px; }
.hero-text h1 { 
  font-size: 3.2rem; font-weight: 800; color: #ffffff; line-height: 1.2; 
  margin-bottom: 20px; letter-spacing: -0.5px; 
}
.hero-text h1 span { color: var(--accent); }
.hero-text p { font-size: 1.2rem; color: rgba(255,255,255,0.85); margin-bottom: 32px; max-width: 600px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.btn { 
  padding: 14px 36px; border-radius: 50px; font-weight: 600; font-size: 1rem; 
  border: none; cursor: pointer; transition: all var(--transition); 
  display: inline-flex; align-items: center; gap: 8px; 
}
.btn-primary { background: var(--accent); color: var(--primary-dark); }
.btn-primary:hover { 
  background: var(--accent-light); transform: translateY(-2px); 
  box-shadow: 0 8px 24px rgba(232,168,56,0.4); 
}
.btn-outline { background: transparent; border: 2px solid rgba(255,255,255,0.4); color: #ffffff; }
.btn-outline:hover { border-color: var(--accent); background: rgba(232,168,56,0.1); transform: translateY(-2px); }
.hero-visual { flex: 1; min-width: 280px; display: flex; justify-content: center; }
.hero-visual svg { width: 100%; max-width: 480px; height: auto; filter: drop-shadow(0 20px 40px rgba(0,0,0,0.3)); }
.hero-badge { 
  display: inline-block; background: rgba(255,255,255,0.1); backdrop-filter: blur(10px); 
  padding: 8px 20px; border-radius: 50px; color: var(--accent); font-size: 0.85rem; 
  margin-bottom: 16px; border: 1px solid rgba(255,255,255,0.15); 
}
@media (max-width: 768px) {
  .hero-text h1 { font-size: 2.2rem; }
  .hero { padding: 100px 0 60px; }
}

/* Sections */
.section { padding: 80px 0; }
.section-title { text-align: center; margin-bottom: 48px; }
.section-title h2 { font-size: 2.2rem; font-weight: 700; color: var(--primary); margin-bottom: 12px; }
.section-title p { color: var(--text-light); max-width: 600px; margin: 0 auto; font-size: 1.05rem; }
.section-title .accent-line { width: 60px; height: 4px; background: var(--accent); margin: 16px auto; border-radius: 2px; }

/* Brand Intro */
.brand-intro { 
  background: var(--bg-card); border-radius: var(--radius); padding: 60px; 
  box-shadow: var(--shadow); margin-bottom: 40px; transition: background var(--transition); 
}
.brand-intro h2 { font-size: 1.8rem; color: var(--primary); margin-bottom: 20px; }
.brand-intro p { margin-bottom: 16px; color: var(--text); }
.brand-stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 24px; margin-top: 32px; }
.stat-item { 
  text-align: center; padding: 24px 16px; background: var(--bg); 
  border-radius: var(--radius-sm); transition: background var(--transition); 
}
.stat-number { font-size: 2.8rem; font-weight: 800; color: var(--accent); }
.stat-label { color: var(--text-light); font-size: 0.95rem; margin-top: 8px; }

/* Story & Timeline */
.story-timeline { position: relative; padding: 20px 0; }
.timeline-item { display: flex; gap: 30px; margin-bottom: 40px; position: relative; }
.timeline-year { min-width: 100px; font-weight: 700; font-size: 1.3rem; color: var(--accent); }
.timeline-content { 
  flex: 1; background: var(--bg-card); padding: 24px; 
  border-radius: var(--radius-sm); box-shadow: var(--shadow); transition: background var(--transition); 
}
.timeline-content h3 { color: var(--primary); margin-bottom: 8px; }

/* Culture & Team */
.culture-grid, .team-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 24px; }
.culture-card, .team-card { 
  background: var(--bg-card); padding: 32px 24px; border-radius: var(--radius); 
  box-shadow: var(--shadow); text-align: center; transition: all var(--transition); 
}
.culture-card:hover, .team-card:hover { transform: translateY(-4px); box-shadow: 0 12px 40px rgba(0,0,0,0.1); }
.culture-card svg, .team-card svg { width: 56px; height: 56px; margin: 0 auto 16px; color: var(--accent); }
.culture-card h3, .team-card h3 { color: var(--primary); margin-bottom: 8px; }
.team-card .role { color: var(--accent); font-weight: 600; font-size: 0.9rem; }

/* Products */
.product-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; }
.product-card { 
  background: var(--bg-card); border-radius: var(--radius); overflow: hidden; 
  box-shadow: var(--shadow); transition: all var(--transition); 
}
.product-card:hover { transform: translateY(-4px); box-shadow: 0 12px 40px rgba(0,0,0,0.12); }
.product-card .product-img { 
  background: linear-gradient(135deg, var(--primary-light), var(--primary)); 
  padding: 40px; display: flex; align-items: center; justify-content: center; 
}
.product-card .product-img svg { width: 80px; height: 80px; color: #ffffff; }
.product-card .product-body { padding: 24px; }
.product-card .product-body h3 { color: var(--primary); margin-bottom: 12px; }
.product-card .product-body p { color: var(--text-light); font-size: 0.95rem; }

/* Advantages */
.advantages-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.advantage-item { 
  background: var(--bg-card); padding: 32px 24px; border-radius: var(--radius); 
  box-shadow: var(--shadow); display: flex; gap: 20px; align-items: flex-start; 
  transition: background var(--transition); 
}
.advantage-item svg { width: 48px; height: 48px; flex-shrink: 0; color: var(--accent); }
.advantage-item h3 { color: var(--primary); margin-bottom: 8px; font-size: 1.1rem; }

/* Solutions */
.solution-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 24px; }
.solution-card { 
  background: var(--bg-card); padding: 32px 24px; border-radius: var(--radius); 
  box-shadow: var(--shadow); text-align: center; transition: all var(--transition); 
  border-top: 4px solid var(--accent); 
}
.solution-card:hover { transform: translateY(-4px); }
.solution-card svg { width: 48px; height: 48px; margin: 0 auto 16px; color: var(--accent); }
.solution-card h3 { color: var(--primary); margin-bottom: 8px; }

/* Cases */
.case-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; }
.case-card { 
  background: var(--bg-card); border-radius: var(--radius); overflow: hidden; 
  box-shadow: var(--shadow); transition: all var(--transition); 
}
.case-card:hover { transform: translateY(-4px); }
.case-card .case-img { 
  height: 200px; background: linear-gradient(135deg, var(--primary-light), var(--primary-dark)); 
  display: flex; align-items: center; justify-content: center; color: #ffffff; font-size: 2rem; 
}
.case-card .case-body { padding: 24px; }
.case-card .case-body h3 { color: var(--primary); margin-bottom: 8px; }
.case-card .case-body .case-tag { 
  display: inline-block; background: var(--accent); color: var(--primary-dark); 
  padding: 4px 12px; border-radius: 50px; font-size: 0.8rem; font-weight: 600; margin-bottom: 12px; 
}

/* Testimonials / Feedback */
.feedback-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.feedback-card { 
  background: var(--bg-card); padding: 32px 24px; border-radius: var(--radius); 
  box-shadow: var(--shadow); position: relative; transition: background var(--transition); 
}
.feedback-card::before { 
  content: '"'; font-size: 4rem; color: var(--accent); opacity: 0.3; 
  position: absolute; top: 8px; left: 16px; font-family: serif; 
}
.feedback-card p { font-style: italic; margin-bottom: 16px; color: var(--text); }
.feedback-card .author { font-weight: 600; color: var(--primary); }

/* News / Articles */
.article-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.article-card { 
  background: var(--bg-card); border-radius: var(--radius); overflow: hidden; 
  box-shadow: var(--shadow); transition: all var(--transition); 
}
.article-card:hover { transform: translateY(-4px); }
.article-card .article-img { 
  height: 180px; background: linear-gradient(135deg, var(--primary-light), var(--primary)); 
  display: flex; align-items: center; justify-content: center; color: #ffffff; font-size: 1.5rem; 
}
.article-card .article-body { padding: 20px; }
.article-card .article-body .date { color: var(--text-light); font-size: 0.85rem; margin-bottom: 8px; }
.article-card .article-body h3 { color: var(--primary); font-size: 1.15rem; margin-bottom: 8px; }
.article-card .article-body p { color: var(--text-light); font-size: 0.95rem; margin-bottom: 12px; }
.article-card .article-body .read-more { color: var(--accent); font-weight: 600; font-size: 0.9rem; }

/* FAQ */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { 
  background: var(--bg-card); border-radius: var(--radius-sm); margin-bottom: 12px; 
  box-shadow: var(--shadow); overflow: hidden; transition: background var(--transition); 
}
.faq-question { 
  padding: 18px 24px; cursor: pointer; display: flex; justify-content: space-between; 
  align-items: center; font-weight: 600; color: var(--primary); transition: color var(--transition); 
}
.faq-question:hover { color: var(--accent); }
.faq-question .icon { font-size: 1.2rem; transition: transform 0.3s; }
.faq-item.open .faq-question .icon { transform: rotate(45deg); }
.faq-answer { 
  max-height: 0; overflow: hidden; transition: max-height 0.4s ease, padding 0.3s; 
  padding: 0 24px; color: var(--text); 
}
.faq-item.open .faq-answer { max-height: 400px; padding: 0 24px 18px; }

/* HowTo */
.howto-section { 
  background: var(--bg-card); border-radius: var(--radius); padding: 40px; 
  box-shadow: var(--shadow); margin-top: 40px; transition: background var(--transition); 
}
.howto-section h2 { color: var(--primary); margin-bottom: 24px; }
.howto-step { display: flex; gap: 20px; margin-bottom: 20px; align-items: flex-start; }
.howto-step .step-num { 
  width: 36px; height: 36px; border-radius: 50%; background: var(--accent); 
  color: var(--primary-dark); display: flex; align-items: center; justify-content: center; 
  font-weight: 700; flex-shrink: 0; 
}
.howto-step .step-content { flex: 1; }
.howto-step .step-content h4 { color: var(--primary); margin-bottom: 4px; }

/* Contact */
.contact-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 32px; }
.contact-info { 
  background: var(--bg-card); padding: 32px; border-radius: var(--radius); 
  box-shadow: var(--shadow); transition: background var(--transition); 
}
.contact-info h3 { color: var(--primary); margin-bottom: 20px; }
.contact-info .info-item { display: flex; gap: 16px; margin-bottom: 16px; align-items: center; }
.contact-info .info-item svg { width: 24px; height: 24px; color: var(--accent); flex-shrink: 0; }
.contact-form { 
  background: var(--bg-card); padding: 32px; border-radius: var(--radius); 
  box-shadow: var(--shadow); transition: background var(--transition); 
}
.contact-form .form-group { margin-bottom: 16px; }
.contact-form input, .contact-form textarea { 
  width: 100%; padding: 14px 16px; border: 2px solid var(--border); 
  border-radius: var(--radius-sm); background: var(--bg); color: var(--text); 
  font-size: 1rem; transition: border var(--transition), background var(--transition); 
}
.contact-form input:focus, .contact-form textarea:focus { outline: none; border-color: var(--accent); }
.contact-form textarea { height: 120px; resize: vertical; }

/* Footer */
.site-footer { 
  background: var(--primary-dark); color: rgba(255,255,255,0.8); 
  padding: 60px 0 30px; margin-top: 60px; 
}
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 40px; margin-bottom: 40px; }
.footer-col h4 { color: #ffffff; margin-bottom: 16px; font-size: 1.1rem; }
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a { color: rgba(255,255,255,0.7); font-size: 0.9rem; }
.footer-col ul li a:hover { color: var(--accent); }
.footer-bottom { 
  border-top: 1px solid rgba(255,255,255,0.1); padding-top: 24px; 
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px; font-size: 0.85rem; 
}
.footer-bottom a { color: rgba(255,255,255,0.7); }
.footer-bottom a:hover { color: var(--accent); }

/* Back to top */
.back-to-top { 
  position: fixed; bottom: 30px; right: 30px; width: 48px; height: 48px; 
  border-radius: 50%; background: var(--accent); color: var(--primary-dark); 
  border: none; cursor: pointer; font-size: 1.4rem; box-shadow: var(--shadow); 
  opacity: 0; visibility: hidden; transition: all var(--transition); z-index: 999; 
  display: flex; align-items: center; justify-content: center; 
}
.back-to-top.visible { opacity: 1; visibility: visible; }
.back-to-top:hover { transform: translateY(-4px); }

/* Animations */
.fade-in { 
  opacity: 0; transform: translateY(30px); 
  transition: opacity 0.6s ease, transform 0.6s ease; 
}
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* Scrollbar */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-light); }

@media (max-width: 600px) {
  .section-title h2 { font-size: 1.6rem; }
  .brand-intro { padding: 32px 20px; }
  .howto-section { padding: 24px; }
}