:/* 九游体育(中国)官方网站 - style.css */
:root {
  --primary: #1a73e8;
  --primary-dark: #0d47a1;
  --primary-light: #4fc3f7;
  --primary-gradient: linear-gradient(135deg, #0d47a1 0%, #1a73e8 50%, #4fc3f7 100%);
  --bg: #f8f9fa;
  --bg-card: #ffffff;
  --text: #1a1a2e;
  --text-secondary: #555;
  --shadow: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-hover: 0 12px 40px rgba(0,0,0,0.12);
  --radius: 16px;
  --radius-sm: 8px;
  --radius-full: 50px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --blur: blur(12px);
  --glass-bg: rgba(255,255,255,0.85);
  --glass-border: 1px solid rgba(0,0,0,0.05);
}

.dark {
  --bg: #0d1117;
  --bg-card: #161b22;
  --text: #e6edf3;
  --text-secondary: #8b949e;
  --shadow: 0 4px 20px rgba(0,0,0,0.4);
  --shadow-hover: 0 12px 40px rgba(0,0,0,0.6);
  --glass-bg: rgba(13,17,23,0.85);
  --glass-border: 1px solid rgba(255,255,255,0.05);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  transition: var(--transition);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--primary-dark);
}

img, svg {
  max-width: 100%;
  display: block;
}

ul {
  list-style: none;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== Header & Navigation ===== */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: var(--glass-bg);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border-bottom: var(--glass-border);
  transition: var(--transition);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 24px;
  font-weight: 700;
  color: var(--primary);
  transition: var(--transition);
}

.logo svg {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  gap: 30px;
}

.nav-links a {
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
  padding: 6px 0;
  position: relative;
  transition: var(--transition);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: var(--transition);
  border-radius: 2px;
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-links a:hover {
  color: var(--primary);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.theme-toggle {
  background: none;
  border: none;
  font-size: 22px;
  cursor: pointer;
  color: var(--text);
  padding: 8px;
  border-radius: 50%;
  transition: var(--transition);
  line-height: 1;
}

.theme-toggle:hover {
  background: rgba(0,0,0,0.05);
  transform: scale(1.1);
}

.dark .theme-toggle:hover {
  background: rgba(255,255,255,0.1);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 28px;
  cursor: pointer;
  color: var(--text);
  padding: 4px;
  line-height: 1;
}

.search-box {
  display: flex;
  align-items: center;
  background: var(--bg);
  border-radius: 30px;
  padding: 6px 16px;
  border: 1px solid rgba(0,0,0,0.1);
  transition: var(--transition);
}

.dark .search-box {
  background: #0d1117;
  border-color: rgba(255,255,255,0.1);
}

.search-box:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(26,115,232,0.15);
}

.search-box input {
  border: none;
  background: transparent;
  outline: none;
  font-size: 14px;
  padding: 6px 0;
  color: var(--text);
  width: 120px;
  transition: var(--transition);
}

.search-box input::placeholder {
  color: var(--text-secondary);
  opacity: 0.7;
}

.search-box button {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 16px;
  color: var(--text-secondary);
  transition: var(--transition);
  padding: 4px;
}

.search-box button:hover {
  color: var(--primary);
}

/* ===== Breadcrumb ===== */
.breadcrumb {
  font-size: 0.9rem;
  color: var(--text-secondary);
  padding: 12px 0;
  max-width: 1200px;
  margin: 70px auto 0;
  padding-left: 20px;
}

.breadcrumb a {
  color: var(--primary);
}

.breadcrumb a:hover {
  text-decoration: underline;
}

/* ===== Hero Banner ===== */
.hero {
  margin-top: 70px;
  position: relative;
  overflow: hidden;
  min-height: 600px;
  display: flex;
  align-items: center;
  background: var(--primary-gradient);
}

.dark .hero {
  background: linear-gradient(135deg, #0a0e1a 0%, #0d47a1 60%, #1a3a6b 100%);
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at 20% 50%, rgba(255,255,255,0.1) 0%, transparent 50%);
  pointer-events: none;
}

.hero-slider {
  position: relative;
  width: 100%;
  height: 100%;
}

.hero-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.8s ease;
  padding: 60px 20px;
}

.hero-slide.active {
  opacity: 1;
  position: relative;
}

.hero-content {
  text-align: center;
  color: white;
  max-width: 800px;
  animation: fadeInUp 0.8s ease forwards;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-content h1 {
  font-size: clamp(2.2rem, 6vw, 4rem);
  font-weight: 800;
  margin-bottom: 20px;
  text-shadow: 0 2px 20px rgba(0,0,0,0.2);
  line-height: 1.2;
}

.hero-content p {
  font-size: clamp(1rem, 2vw, 1.3rem);
  opacity: 0.9;
  margin-bottom: 30px;
  line-height: 1.7;
  text-shadow: 0 1px 10px rgba(0,0,0,0.1);
}

.hero-btn {
  display: inline-block;
  padding: 14px 40px;
  background: white;
  color: var(--primary);
  font-weight: 700;
  border-radius: var(--radius-full);
  font-size: 16px;
  transition: var(--transition);
  box-shadow: 0 8px 30px rgba(0,0,0,0.15);
  position: relative;
  overflow: hidden;
}

.hero-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  transition: left 0.5s ease;
}

.hero-btn:hover::before {
  left: 100%;
}

.hero-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.2);
  color: var(--primary-dark);
}

.hero-dots {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 12px;
}

.hero-dots span {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255,255,255,0.4);
  cursor: pointer;
  transition: var(--transition);
}

.hero-dots span:hover {
  background: rgba(255,255,255,0.7);
}

.hero-dots span.active {
  background: white;
  transform: scale(1.2);
  box-shadow: 0 0 10px rgba(255,255,255,0.5);
}

/* ===== Sections ===== */
section {
  padding: 80px 0;
}

.section-title {
  text-align: center;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text);
}

.section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 700px;
  margin: 0 auto 50px;
  line-height: 1.6;
}

/* ===== Card Grid ===== */
.grid {
  display: grid;
  gap: 30px;
}

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

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

.card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 30px;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 1px solid rgba(0,0,0,0.04);
  position: relative;
  overflow: hidden;
}

.dark .card {
  border-color: rgba(255,255,255,0.05);
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--primary-gradient);
  opacity: 0;
  transition: var(--transition);
}

.card:hover::before {
  opacity: 1;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}

.card-icon {
  font-size: 40px;
  margin-bottom: 16px;
  display: block;
  line-height: 1;
}

.card h3 {
  font-size: 1.3rem;
  margin-bottom: 10px;
  color: var(--text);
}

.card p {
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===== About Section ===== */
.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-text p {
  margin-bottom: 16px;
  color: var(--text-secondary);
  line-height: 1.8;
}

.about-image {
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  border-radius: var(--radius);
  min-height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 60px;
  position: relative;
  overflow: hidden;
}

.about-image::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 60%);
  animation: rotate 10s linear infinite;
}

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

/* ===== Team Cards ===== */
.team-card {
  text-align: center;
}

.team-avatar {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 40px;
  color: white;
  transition: var(--transition);
}

.team-card:hover .team-avatar {
  transform: scale(1.1);
  box-shadow: 0 8px 25px rgba(26,115,232,0.3);
}

/* ===== Data Grid ===== */
.data-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}

.data-item {
  text-align: center;
  padding: 30px;
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 1px solid rgba(0,0,0,0.04);
}

.dark .data-item {
  border-color: rgba(255,255,255,0.05);
}

.data-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.data-number {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.2;
}

.data-label {
  color: var(--text-secondary);
  margin-top: 8px;
  font-size: 1rem;
}

/* ===== FAQ ===== */
.faq-item {
  background: var(--bg-card);
  border-radius: var(--radius);
  margin-bottom: 12px;
  box-shadow: var(--shadow);
  overflow: hidden;
  border: 1px solid rgba(0,0,0,0.04);
  transition: var(--transition);
}

.dark .faq-item {
  border-color: rgba(255,255,255,0.05);
}

.faq-item:hover {
  box-shadow: var(--shadow-hover);
}

.faq-question {
  padding: 20px 24px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
  user-select: none;
}

.faq-question:hover {
  background: rgba(0,0,0,0.02);
}

.dark .faq-question:hover {
  background: rgba(255,255,255,0.02);
}

.faq-question span {
  transition: var(--transition);
  font-size: 14px;
  line-height: 1;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
  padding: 0 24px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.faq-item.open .faq-answer {
  max-height: 400px;
  padding: 0 24px 20px;
}

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

/* ===== Partner Grid ===== */
.partner-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 20px;
}

.partner-item {
  background: var(--bg-card);
  border-radius: 12px;
  padding: 20px;
  text-align: center;
  box-shadow: var(--shadow);
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
  border: 1px solid rgba(0,0,0,0.04);
  cursor: default;
}

.dark .partner-item {
  border-color: rgba(255,255,255,0.05);
}

.partner-item:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-hover);
  color: var(--primary);
}

/* ===== Client Logos ===== */
.client-logos {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 40px;
  align-items: center;
}

.client-logo {
  width: 120px;
  height: 60px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 14px;
  opacity: 0.6;
  transition: var(--transition);
  border: 1px solid rgba(0,0,0,0.05);
}

.dark .client-logo {
  border-color: rgba(255,255,255,0.05);
}

.client-logo:hover {
  opacity: 1;
  transform: scale(1.05);
}

/* ===== Footer ===== */
footer {
  background: var(--bg-card);
  border-top: 1px solid rgba(0,0,0,0.05);
  padding: 60px 0 30px;
  margin-top: 40px;
}

.dark footer {
  border-top-color: rgba(255,255,255,0.05);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
}

.footer-col h4 {
  font-size: 1.1rem;
  margin-bottom: 16px;
  color: var(--text);
}

.footer-col ul li {
  margin-bottom: 8px;
}

.footer-col ul li a {
  color: var(--text-secondary);
  font-size: 0.95rem;
  transition: var(--transition);
}

.footer-col ul li a:hover {
  color: var(--primary);
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid rgba(0,0,0,0.05);
  margin-top: 40px;
  padding-top: 20px;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.8;
}

.dark .footer-bottom {
  border-top-color: rgba(255,255,255,0.05);
}

/* ===== Back to Top ===== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 50%;
  font-size: 22px;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(0,0,0,0.2);
  transition: var(--transition);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--primary-dark);
  transform: translateY(-4px);
  box-shadow: 0 8px 25px rgba(26,115,232,0.4);
}

/* ===== Scroll Animation ===== */
.fade-up {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Structured Data Hidden ===== */
.hidden-schema {
  display: none;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .data-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  
  .partner-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    background: var(--bg-card);
    flex-direction: column;
    padding: 20px;
    gap: 16px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    transform: translateY(-120%);
    transition: var(--transition);
    border-bottom: 1px solid rgba(0,0,0,0.05);
    z-index: 999;
  }
  
  .nav-links.open {
    transform: translateY(0);
  }
  
  .menu-toggle {
    display: block;
  }
  
  .search-box {
    display: none;
  }
  
  .about-content {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  
  .grid-3 {
    grid-template-columns: 1fr;
  }
  
  .grid-2 {
    grid-template-columns: 1fr;
  }
  
  .data-grid {
    grid-template-columns: 1fr 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
  }
  
  .hero {
    min-height: 450px;
  }
  
  .hero-content h1 {
    font-size: 2rem;
  }
  
  .partner-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  section {
    padding: 60px 0;
  }
  
  .card {
    padding: 24px;
  }
}

@media (max-width: 480px) {
  section {
    padding: 50px 0;
  }
  
  .data-grid {
    grid-template-columns: 1fr;
  }
  
  .partner-grid {
    grid-template-columns: 1fr;
  }
  
  .grid-4 {
    grid-template-columns: 1fr;
  }
  
  .hero {
    min-height: 380px;
  }
  
  .hero-content h1 {
    font-size: 1.8rem;
  }
  
  .hero-btn {
    padding: 12px 30px;
    font-size: 14px;
  }
  
  .back-to-top {
    width: 40px;
    height: 40px;
    font-size: 18px;
    bottom: 20px;
    right: 20px;
  }
}

/* ===== Additional Enhancements ===== */
/* Smooth scrollbar */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--text-secondary);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary);
}

/* Focus styles for accessibility */
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* Selection color */
::selection {
  background: var(--primary);
  color: white;
}

/* Gradient text effect for titles */
.gradient-text {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Glass morphism effect */
.glass {
  background: var(--glass-bg);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border: var(--glass-border);
}

/* Button hover effect */
.btn-hover-effect {
  position: relative;
  overflow: hidden;
}

.btn-hover-effect::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255,255,255,0.2);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.6s ease, height 0.6s ease;
}

.btn-hover-effect:hover::after {
  width: 300px;
  height: 300px;
}

/* Card image placeholder */
.card-image-placeholder {
  width: 100%;
  height: 180px;
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 48px;
}

/* Tag / Badge */
.tag {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(26,115,232,0.1);
  color: var(--primary);
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  transition: var(--transition);
}

.tag:hover {
  background: var(--primary);
  color: white;
}

/* Divider */
.divider {
  width: 60px;
  height: 4px;
  background: var(--primary-gradient);
  border-radius: 2px;
  margin: 20px auto;
}

/* Loading spinner */
.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid rgba(26,115,232,0.1);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* Pulse animation for important elements */
.pulse {
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(26,115,232,0.4);
  }
  70% {
    box-shadow: 0 0 0 10px rgba(26,115,232,0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(26,115,232,0);
  }
}

/* Shimmer loading effect */
.shimmer {
  background: linear-gradient(90deg, var(--bg) 25%, var(--bg-card) 50%, var(--bg) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}