```css
/* 必一运动(中国)官方网站-BSports - style.css */
/* 随机风格: 渐变Banner、圆角卡片、毛玻璃效果、响应式、暗色模式、滚动动画、hover动画 */

/* 全局重置与变量 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #ffffff;
  --bg2: #f4f6f9;
  --text: #1a1a2e;
  --text2: #555;
  --primary: #1a1a2e;
  --accent: #f0c040;
  --accent2: #e6a800;
  --card-bg: #ffffff;
  --shadow: 0 8px 32px rgba(0,0,0,0.08);
  --radius: 20px;
  --radius-sm: 12px;
  --glass: rgba(255,255,255,0.7);
  --border: #e0e0e0;
  --nav-bg: rgba(255,255,255,0.9);
  --footer-bg: #1a1a2e;
  --footer-text: #ccc;
}

[data-theme="dark"] {
  --bg: #121212;
  --bg2: #1e1e2e;
  --text: #e0e0e0;
  --text2: #aaa;
  --primary: #f0c040;
  --card-bg: #2a2a3e;
  --shadow: 0 8px 32px rgba(0,0,0,0.4);
  --glass: rgba(30,30,46,0.8);
  --border: #333;
  --nav-bg: rgba(18,18,18,0.95);
  --footer-bg: #0a0a12;
  --footer-text: #999;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.8;
  transition: background 0.3s, color 0.3s;
}

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

/* Header & Nav */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: var(--nav-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: background 0.3s;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  max-width: 1200px;
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  font-weight: 800;
  font-size: 1.4rem;
}

.logo svg {
  width: 40px;
  height: 40px;
}

.logo span {
  background: linear-gradient(135deg, var(--accent), #f5a623);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

nav ul {
  display: flex;
  list-style: none;
  gap: 24px;
}

nav a {
  text-decoration: none;
  color: var(--text);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 6px 0;
  position: relative;
  transition: color 0.3s;
}

nav a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.3s;
}

nav a:hover,
nav a.active {
  color: var(--accent);
}

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

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

.theme-toggle,
.search-toggle,
.menu-toggle {
  background: none;
  border: none;
  font-size: 1.3rem;
  cursor: pointer;
  color: var(--text);
  padding: 4px;
  transition: color 0.3s;
}

.theme-toggle:hover,
.search-toggle:hover,
.menu-toggle:hover {
  color: var(--accent);
}

.menu-toggle {
  display: none;
}

.search-box {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  width: 100%;
  background: var(--nav-bg);
  backdrop-filter: blur(20px);
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}

.search-box.open {
  display: block;
}

.search-box input {
  width: 100%;
  padding: 12px 20px;
  border: 2px solid var(--border);
  border-radius: 30px;
  font-size: 1rem;
  background: var(--bg);
  color: var(--text);
  outline: none;
  transition: border 0.3s;
}

.search-box input:focus {
  border-color: var(--accent);
}

/* Breadcrumb */
.breadcrumb {
  background: var(--bg2);
  padding: 16px 0;
  margin-top: 70px;
  border-bottom: 1px solid var(--border);
}

.breadcrumb ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.9rem;
}

.breadcrumb li + li::before {
  content: '›';
  margin-right: 8px;
  color: var(--text2);
}

.breadcrumb a {
  color: var(--text2);
  text-decoration: none;
  transition: color 0.3s;
}

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

.breadcrumb .current {
  color: var(--text);
  font-weight: 600;
}

/* Hero */
.hero {
  position: relative;
  min-height: 85vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 20px 80px;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 40%, rgba(240,192,64,0.15) 0%, transparent 60%),
              radial-gradient(circle at 70% 60%, rgba(255,255,255,0.05) 0%, transparent 50%);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 900px;
}

.hero h1 {
  font-size: 3.2rem;
  font-weight: 900;
  color: #fff;
  margin-bottom: 20px;
  line-height: 1.2;
  text-shadow: 0 4px 20px rgba(0,0,0,0.3);
}

.hero h1 span {
  background: linear-gradient(135deg, var(--accent), #f5a623);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.2rem;
  color: rgba(255,255,255,0.85);
  max-width: 700px;
  margin: 0 auto 30px;
  line-height: 1.8;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  padding: 14px 36px;
  border-radius: 50px;
  font-weight: 700;
  font-size: 1rem;
  text-decoration: none;
  display: inline-block;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #f5a623);
  color: #1a1a2e;
  box-shadow: 0 8px 24px rgba(240,192,64,0.4);
}

.btn-primary:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(240,192,64,0.5);
}

.btn-outline {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255,255,255,0.4);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-4px);
}

.hero-carousel {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 2;
}

.hero-carousel span {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255,255,255,0.3);
  cursor: pointer;
  transition: all 0.3s;
}

.hero-carousel span.active {
  background: var(--accent);
  width: 32px;
  border-radius: 6px;
}

/* Section common */
section {
  padding: 80px 0;
}

.section-title {
  text-align: center;
  margin-bottom: 50px;
}

.section-title h2 {
  font-size: 2.4rem;
  font-weight: 800;
  margin-bottom: 16px;
  position: relative;
  display: inline-block;
}

.section-title h2::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background: var(--accent);
  margin: 12px auto 0;
  border-radius: 4px;
}

.section-title p {
  color: var(--text2);
  max-width: 600px;
  margin: 0 auto;
  font-size: 1.05rem;
}

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 30px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: all 0.4s ease;
  opacity: 0;
  transform: translateY(40px);
}

.card.visible {
  opacity: 1;
  transform: translateY(0);
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: 0 16px 48px rgba(0,0,0,0.12);
}

.card-icon {
  width: 60px;
  height: 60px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--accent), #f5a623);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.card-icon svg {
  width: 32px;
  height: 32px;
  fill: #1a1a2e;
}

.card h3 {
  font-size: 1.3rem;
  margin-bottom: 12px;
}

.card p {
  color: var(--text2);
  line-height: 1.7;
}

/* About / Team */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: center;
}

.about-image {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.about-image svg {
  width: 100%;
  height: auto;
  display: block;
}

.about-text h2 {
  font-size: 2rem;
  margin-bottom: 20px;
}

.about-text p {
  margin-bottom: 16px;
  color: var(--text2);
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}

.team-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: all 0.3s;
  opacity: 0;
  transform: translateY(30px);
}

.team-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.team-card:hover {
  transform: translateY(-6px);
}

.team-card .avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  margin: 0 auto 12px;
  background: linear-gradient(135deg, var(--accent), #f5a623);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  font-weight: 700;
  color: #1a1a2e;
}

.team-card h4 {
  font-size: 1.1rem;
  margin-bottom: 4px;
}

.team-card .role {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 8px;
}

.team-card p {
  font-size: 0.9rem;
  color: var(--text2);
}

/* Stats */
.stats {
  background: var(--bg2);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  text-align: center;
}

.stat-item {
  padding: 20px;
}

.stat-number {
  font-size: 2.8rem;
  font-weight: 900;
  color: var(--accent);
}

.stat-label {
  font-size: 1rem;
  color: var(--text2);
  margin-top: 8px;
}

/* Testimonials */
.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.testimonial-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.4s;
}

.testimonial-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.testimonial-card .stars {
  color: var(--accent);
  font-size: 1.2rem;
  margin-bottom: 12px;
}

.testimonial-card p {
  font-style: italic;
  color: var(--text2);
  margin-bottom: 16px;
}

.testimonial-card .user {
  display: flex;
  align-items: center;
  gap: 12px;
}

.testimonial-card .user .name {
  font-weight: 700;
}

.testimonial-card .user .title {
  font-size: 0.85rem;
  color: var(--text2);
}

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

.faq-item {
  background: var(--card-bg);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  border: 1px solid var(--border);
  overflow: hidden;
  transition: all 0.3s;
}

.faq-question {
  padding: 18px 24px;
  cursor: pointer;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--card-bg);
  transition: background 0.3s;
}

.faq-question:hover {
  background: var(--bg2);
}

.faq-question .icon {
  font-size: 1.4rem;
  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;
}

.faq-item.open .faq-answer {
  max-height: 500px;
  padding: 0 24px 20px;
}

.faq-answer p {
  color: var(--text2);
  line-height: 1.7;
}

/* HowTo */
.howto {
  background: var(--bg2);
}

.howto-content {
  max-width: 800px;
  margin: 0 auto;
}

.howto-step {
  display: flex;
  gap: 20px;
  margin-bottom: 24px;
  align-items: flex-start;
  opacity: 0;
  transform: translateX(-20px);
  transition: all 0.4s;
}

.howto-step.visible {
  opacity: 1;
  transform: translateX(0);
}

.howto-step .step-num {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent);
  color: #1a1a2e;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.howto-step .step-text h4 {
  font-size: 1.1rem;
  margin-bottom: 6px;
}

.howto-step .step-text p {
  color: var(--text2);
}

/* Articles */
.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.article-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: all 0.4s;
  opacity: 0;
  transform: translateY(30px);
}

.article-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.article-card:hover {
  transform: translateY(-6px);
}

.article-card .article-img {
  height: 200px;
  background: linear-gradient(135deg, #1a1a2e, #0f3460);
  display: flex;
  align-items: center;
  justify-content: center;
}

.article-card .article-img svg {
  width: 80px;
  height: 80px;
  opacity: 0.6;
}

.article-card .article-body {
  padding: 20px;
}

.article-card .date {
  font-size: 0.85rem;
  color: var(--text2);
  margin-bottom: 8px;
}

.article-card h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.article-card p {
  color: var(--text2);
  font-size: 0.95rem;
  margin-bottom: 16px;
}

.article-card .read-more {
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
  transition: color 0.3s;
}

.article-card .read-more:hover {
  color: var(--accent2);
}

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.contact-info h3 {
  font-size: 1.6rem;
  margin-bottom: 20px;
}

.contact-info p {
  margin-bottom: 12px;
  color: var(--text2);
  display: flex;
  align-items: center;
  gap: 12px;
}

.contact-info .icon {
  font-size: 1.3rem;
  width: 24px;
}

.contact-qr {
  display: flex;
  gap: 20px;
  margin-top: 20px;
}

.contact-qr .qr-item {
  text-align: center;
}

.contact-qr svg {
  width: 120px;
  height: 120px;
  border-radius: 12px;
  background: #fff;
  padding: 8px;
  box-shadow: var(--shadow);
}

.contact-qr .qr-label {
  margin-top: 8px;
  font-size: 0.9rem;
  color: var(--text2);
}

/* Footer */
footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  padding: 60px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  margin-bottom: 40px;
}

.footer-col h4 {
  color: #fff;
  font-size: 1.1rem;
  margin-bottom: 16px;
}

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

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

.footer-col a {
  color: var(--footer-text);
  text-decoration: none;
  transition: color 0.3s;
  font-size: 0.9rem;
}

.footer-col a:hover {
  color: var(--accent);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.85rem;
}

.footer-bottom a {
  color: var(--footer-text);
  text-decoration: none;
  margin: 0 8px;
}

.footer-bottom a:hover {
  color: var(--accent);
}

/* Back to top */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--accent);
  color: #1a1a2e;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(240,192,64,0.4);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s;
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(240,192,64,0.5);
}

/* Responsive */
@media (max-width: 992px) {
  .about-grid {
    grid-template-columns: 1fr;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  nav ul {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: var(--nav-bg);
    backdrop-filter: blur(20px);
    padding: 20px;
    border-bottom: 1px solid var(--border);
  }
  nav ul.open {
    display: flex;
  }
  .menu-toggle {
    display: block;
  }
  .hero h1 {
    font-size: 2.2rem;
  }
  .hero p {
    font-size: 1rem;
  }
  .section-title h2 {
    font-size: 1.8rem;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.8rem;
  }
  .btn {
    padding: 12px 24px;
    font-size: 0.9rem;
  }
  .card-grid {
    grid-template-columns: 1fr;
  }
}

/* Animation helpers */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease;
}

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

.glass-card {
  background: var(--glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: var(--radius);
}

.dark-mode-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
}
```