```css
/* ==========================================================
   PRISM SPORT · 彩虹运动设计系统
   男同网 | nantongwang.cq.cn
   彩虹之下，真爱无界 — Under the Rainbow, Love Without Walls
   ========================================================== */

:root {
  --bg-main: #FAF8F5;
  --bg-soft: #F3F0FF;
  --bg-card: #FFFFFF;
  --ink: #1D1D2A;
  --ink-soft: #6E6A7C;
  --coral: #FF4D6D;
  --orange: #FF8E4D;
  --yellow: #FFBE0B;
  --green: #3BCE7A;
  --blue: #00B4D8;
  --purple: #7B5EA7;
  --rainbow: linear-gradient(90deg, #FF4D6D 0%, #FF8E4D 20%, #FFBE0B 40%, #3BCE7A 60%, #00B4D8 80%, #7B5EA7 100%);
  --rainbow-soft: linear-gradient(135deg, rgba(255,77,109,0.12), rgba(255,142,77,0.10), rgba(255,190,11,0.10), rgba(59,206,122,0.12), rgba(0,180,216,0.10), rgba(123,94,167,0.12));
  --shadow-sm: 0 2px 12px rgba(29,29,42,0.05);
  --shadow-lg: 0 16px 48px rgba(29,29,42,0.10);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 10px;
}

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

body {
  font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  overflow-x: hidden;
  background: var(--bg-main);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--coral); color: #fff; }

/* ===== 核心布局 ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

.section { padding: 100px 0; position: relative; }

.section:nth-child(even) {
  background: var(--bg-soft);
}

/* ===== 导航 ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: none;
  box-shadow: 0 1px 0 rgba(29,29,42,0.04);
}

.site-header::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--rainbow);
  background-size: 200% 100%;
  animation: rainbow-flow 6s linear infinite;
}

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

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.25rem;
  text-decoration: none;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.logo-icon {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  background: var(--rainbow);
  color: #fff;
  box-shadow: 0 4px 14px rgba(255,77,109,0.3);
  position: relative;
  overflow: hidden;
}

.logo-icon::after {
  content: '♂';
  font-weight: 900;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.main-nav a {
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--ink);
  transition: color 0.25s var(--ease);
  position: relative;
  padding: 4px 0;
}

.main-nav a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  background: var(--rainbow);
  border-radius: 2px;
  transition: width 0.35s var(--ease);
}

.main-nav a:hover {
  color: var(--coral);
}

.main-nav a:hover::after {
  width: 100%;
}

.nav-cta {
  padding: 10px 24px;
  border-radius: 100px;
  color: #fff !important;
  font-weight: 700;
  background: var(--rainbow);
  background-size: 200% 100%;
  transition: all 0.4s var(--ease);
  box-shadow: 0 4px 16px rgba(255,77,109,0.25);
}

.nav-cta::after { display: none; }

.nav-cta:hover {
  background-position: 100% 0;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255,77,109,0.35);
  color: #fff !important;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.menu-toggle span {
  width: 22px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: all 0.3s var(--ease);
}

/* ===== Hero ===== */
.hero {
  min-height: 88vh;
  display: flex;
  align-items: centre;
  align-items: center;
  background:
    radial-gradient(circle at 78% 18%, rgba(255,142,77,0.10) 0%, transparent 35%),
    radial-gradient(circle at 88% 80%, rgba(123,94,167,0.12) 0%, transparent 40%),
    radial-gradient(circle at 20% 75%, rgba(0,180,216,0.08) 0%, transparent 30%),
    var(--bg-main);
  padding-top: 72px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  right: -140px;
  top: 10%;
  width: 480px;
  height: 480px;
  border-radius: 50%;
  background: var(--rainbow-soft);
  filter: blur(50px);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  left: -80px;
  bottom: -120px;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,190,11,0.10), transparent 70%);
  pointer-events: none;
}

.hero-content {
  max-width: 720px;
  position: relative;
  z-index: 2;
}

.hero-eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  padding: 6px 18px;
  border-radius: 100px;
  margin-bottom: 20px;
  color: var(--coral);
  background: linear-gradient(90deg, rgba(255,77,109,0.10), rgba(255,142,77,0.08), rgba(255,190,11,0.10));
  border: 1px solid rgba(255,77,109,0.2);
}

.hero h1 {
  font-size: clamp(2.6rem, 6.5vw, 4.2rem);
  line-height: 1.15;
  margin-bottom: 24px;
  font-weight: 900;
  letter-spacing: -0.03em;
  color: var(--ink);
}

.hero p {
  font-size: 1.1rem;
  opacity: 0.75;
  max-width: 540px;
  margin-bottom: 36px;
  line-height: 1.7;
}

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

.hero-image {
  border-radius: 24px;
  overflow: hidden;
  position: relative;
  z-index: 1;
  box-shadow: var(--shadow-lg);
  border: 4px solid rgba(255,255,255,0.9);
}

.hero-image img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.6s var(--ease);
}

.hero-image:hover img {
  transform: scale(1.03);
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  border-radius: 100px;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: all 0.4s var(--ease);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  color: #fff;
  background: var(--rainbow);
  background-size: 180% 100%;
  box-shadow: 0 6px 24px rgba(255,77,109,0.28);
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.25), transparent);
  transition: left 0.6s var(--ease);
}

.btn-primary:hover {
  background-position: 100% 0;
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 12px 36px rgba(255,77,109,0.38);
}

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

.btn-outline {
  background: transparent;
  border: 2px solid var(--ink);
  color: var(--ink);
}

.btn-outline:hover {
  border-color: var(--coral);
  color: var(--coral);
  background: rgba(255,77,109,0.06);
  transform: translateY(-3px);
}

/* ===== 标签 / 标题 ===== */
.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 4px;
  text-transform: uppercase;
  margin-bottom: 14px;
  color: transparent;
  background: var(--rainbow);
  -webkit-background-clip: text;
  background-clip: text;
  position: relative;
}

.section-label::after {
  content: '';
  display: block;
  width: 32px;
  height: 3px;
  margin-top: 8px;
  background: var(--rainbow);
  border-radius: 3px;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  margin-bottom: 16px;
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.section-desc {
  max-width: 620px;
  opacity: 0.7;
  margin-bottom: 48px;
  font-size: 1rem;
  line-height: 1.7;
}

/* ===== 卡片网格 ===== */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 28px;
}

.category-card {
  border-radius: 20px;
  padding: 32px 28px;
  background: var(--bg-card);
  border: 1px solid rgba(29,29,42,0.04);
  box-shadow: var(--shadow-sm);
  transition: all 0.45s var(--ease);
  position: relative;
  overflow: hidden;
}

.category-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--rainbow);
  background-size: 200% 100%;
  opacity: 0.8;
  transition: opacity 0.3s;
}

.category-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.category-card:hover::before {
  opacity: 1;
  animation: rainbow-flow 3s linear infinite;
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 1.4rem;
  background: var(--rainbow-soft);
  border: 1px solid rgba(29,29,42,0.04);
}

.card-link {
  font-weight: 700;
  font-size: 0.85rem;
  text-decoration: none;
  color: var(--coral);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 12px;
  transition: gap 0.3s var(--ease);
}

.card-link:hover {
  gap: 12px;
}

/* ===== 特性块 ===== */
.feature-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.feature-image {
  border-radius: 24px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  position: relative;
}

.feature-image::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 3px solid transparent;
  border-radius: 24px;
  background: var(--rainbow) border-box;
  -webkit-mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0.6;
}

.feature-image img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.6s var(--ease);
}

.feature-image:hover img {
  transform: scale(1.04);
}

.feature-text {
  padding: 12px 0;
}

.feature-text h3 {
  font-size: 1.6rem;
  font-weight: 900;
  margin-bottom: 14px;
  letter-spacing: -0.01em;
}

.feature-text p {
  opacity: 0.75;
  margin-bottom: 20px;
  line-height: 1.7;
}

.feature-list {
  list-style: none;
  margin-top: 16px;
}

.feature-list li {
  padding: 8px 0;
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 500;
}

.feature-list li::before {
  content: '✓';
  font-weight: 900;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--rainbow);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  flex-shrink: 0;
}

/* ===== 数据条 ===== */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stat-item {
  padding: 36px 20px;
  border-radius: 20px;
  background: var(--bg-card);
  border: 1px solid rgba(29,29,42,0.04);
  box-shadow: var(--shadow-sm);
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease);
  position: relative;
  overflow: hidden;
}

.stat-item::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 3px;
  background: var(--rainbow);
  border-radius: 3px;
  transition: width 0.4s var(--ease);
}

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

.stat-item:hover::before {
  width: 60px;
}

.stat-number {
  font-size: 2.6rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  color: transparent;
  background: var(--rainbow);
  -webkit-background-clip: text;
  background-clip: text;
  line-height: 1.2;
}

.stat-label {
  font-size: 0.85rem;
  opacity: 0.6;
  margin-top: 8px;
  font-weight: 500;
  letter-spacing: 1px;
}

/* ===== 内容墙 ===== */
.content-wall {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.content-wall-item {
  border-radius: 18px;
  overflow: hidden;
  background: var(--bg-card);
  border: 1px solid rgba(29,29,42,0.04);
  box-shadow: var(--shadow-sm);
  transition: all 0.45s var(--ease);
  position: relative;
}

.content-wall-item:nth-child(3n+1) { border-top: 4px solid var(--coral); }
.content-wall-item:nth-child(3n+2) { border-top: 4px solid var(--blue); }
.content-wall-item:nth-child(3n+3) { border-top: 4px solid var(--green); }

.content-wall-item:hover {
  transform: translateY(-6px) rotate(-0.5deg);
  box-shadow: var(--shadow-lg);
}

.content-wall-item img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: transform 0.6s var(--ease);
  display: block;
}

.content-wall-item:hover img {
  transform: scale(1.05);
}

.content-wall-body {
  padding: 22px;
}

.content-wall-body h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.content-wall-body p {
  font-size: 0.9rem;
  opacity: 0.7;
  line-height: 1.6;
}

/* ===== FAQ ===== */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
}

.faq-item {
  border: none;
  border-radius: 16px;
  margin-bottom: 12px;
  overflow: hidden;
  cursor: pointer;
  background: var(--bg-card);
  box-shadow: var(--shadow-sm);
  transition: all 0.4s var(--ease);
}

.faq-item:hover {
  box-shadow: var(--shadow-lg);
  transform: translateX(4px);
}

.faq-item .faq-question {
  padding: 20px 24px;
  font-weight: 700;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1rem;
  color: var(--ink);
  position: relative;
}

.faq-item .faq-question::after {
  content: '+';
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--coral);
  transition: transform 0.4s var(--ease);
  flex-shrink: 0;
  margin-left: 16px;
}

.faq-item.open .faq-question::after {
  transform: rotate(45deg);
}

.faq-item .faq-answer {
  padding: 0 24px 22px;
  display: none;
  opacity: 0.7;
  font-size: 0.95rem;
  line-height: 1.7;
  border-top: 1px solid rgba(29,29,42,0.05);
  padding-top: 14px;
}

.faq-item.open .faq-answer {
  display: block;
  animation: fade-slide-in 0.4s var(--ease);
}

@keyframes fade-slide-in {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 0.7; transform: translateY(0); }
}

/* ===== CTA横幅 ===== */
.cta-banner {
  padding: 72px 40px;
  text-align: center;
  border-radius: 28px;
  background: var(--rainbow);
  background-size: 200% 100%;
  color: #fff;
  position: relative;
  overflow: hidden;
  box-shadow: 0 16px 48px rgba(255,77,109,0.3);
  animation: rainbow-flow 8s linear infinite;
}

.cta-banner::before {
  content: '';
  position: absolute;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: rgba(255,255,255,0.12);
  top: -80px;
  right: -50px;
}

.cta-banner::after {
  content: '';
  position: absolute;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: rgba(255,255,255,0.10);
  bottom: -40px;
  left: 10%;
}

.cta-banner h2 {
  color: #fff;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 900;
  margin-bottom: 12px;
  position: relative;
  z-index: 1;
  letter-spacing: -0.02em;
}

.cta-banner p {
  color: rgba(255,255,255,0.9);
  max-width: 500px;
  margin: 0 auto 28px;
  position: relative;
  z-index: 1;
}

.cta-banner .btn-primary {
  background: #fff;
  color: var(--coral);
  box-shadow: 0 6px 24px rgba(0,0,0,0.15);
  position: relative;
  z-index: 1;
}

.cta-banner .btn-primary:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 12px 36px rgba(0,0,0,0.2);
}

/* ===== 页脚 ===== */
.site-footer {
  padding: 64px 0 32px;
  background: var(--bg-card);
  border-top: none;
  position: relative;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--rainbow);
  background-size: 200% 100%;
  animation: rainbow-flow 8s linear infinite;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.footer-brand .logo {
  margin-bottom: 16px;
}

.footer-brand p {
  font-size: 0.9rem;
  opacity: 0.65;
  line-height: 1.7;
  max-width: 260px;
}

.footer-col {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.footer-col h4 {
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 14px;
  color: var(--ink);
}

.footer-col a {
  text-decoration: none;
  color: var(--ink-soft);
  font-size: 0.9rem;
  padding: 6px 0;
  transition: all 0.3s var(--ease);
}

.footer-col a:hover {
  color: var(--coral);
  transform: translateX(4px);
}

.footer-bottom {
  border-top: 1px solid rgba(29,29,42,0.06);
  margin-top: 48px;
  padding-top: 24px;
  text-align: center;
  font-size: 0.8rem;
  opacity: 0.6;
  letter-spacing: 1px;
}

/* ===== 工具类 ===== */
.text-accent {
  color: transparent;
  background: var(--rainbow);
  -webkit-background-clip: text;
  background-clip: text;
  font-weight: 900;
}

.text-center { text-align: center; }

.seo-description {
  max-width: 620px;
  margin: 0 auto 48px;
  opacity: 0.7;
  line-height: 1.7;
}

.mt-0 { margin-top: 0 !important; }
.mb-0 { margin-bottom: 0 !important; }

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .section { padding: 64px 0; }

  .feature-block {
    grid-template-columns: 1fr;
    gap: 32px;
  }

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

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .main-nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(20px);
    padding: 24px 32px;
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    letter-spacing: 0;
    box-shadow: 0 20px 40px rgba(29,29,42,0.08);
    border-bottom: 3px solid transparent;
    border-image: var(--rainbow) 1;
  }

  .main-nav.open {
    display: flex;
  }

  .main-nav li {
    width: 100%;
  }

  .main-nav a {
    display: block;
    padding: 12px 0;
    font-size: 1.05rem;
    font-weight: 600;
  }

  .nav-cta {
    margin-top: 8px;
    text-align: center;
    border-radius: 12px;
    width: 100%;
  }

  .menu-toggle {
    display: flex;
  }

  .menu-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .menu-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .menu-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .hero { min-height: 70vh; padding-top: 80px; }

  .hero h1 { font-size: 2.4rem; }

  .hero-buttons {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    justify-content: center;
  }

  .card-link { margin-top: 8px; }
}

@media (max-width: 480px) {
  .cards-grid,
  .content-wall,
  .stats-bar {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .hero-buttons {
    flex-direction: column;
  }

  .container { padding: 0 20px; }

  .section-title { font-size: 1.6rem; }

  .stat-number { font-size: 2.2rem; }

  .cta-banner { padding: 48px 24px; border-radius: 20px; }
}