/* ===== 米兰体育 完整样式 ===== */
/* 基础重置与全局变量 */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-primary: #e63946;
  --color-primary-dark: #c1121f;
  --color-primary-light: #ff6b6b;
  --color-bg: #f8f9fa;
  --color-surface: #ffffff;
  --color-text: #1a1a2e;
  --color-text-secondary: #4a4a6a;
  --color-border: rgba(0,0,0,0.08);
  --color-glass: rgba(255,255,255,0.25);
  --color-glass-border: rgba(255,255,255,0.4);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-md: 0 8px 30px rgba(0,0,0,0.1);
  --shadow-lg: 0 20px 60px rgba(0,0,0,0.15);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --gradient-banner: linear-gradient(135deg, #1a1a2e 0%, #16213e 40%, #0f3460 70%, #e63946 100%);
  --gradient-card: linear-gradient(145deg, #ffffff, #f0f2f5);
  --gradient-accent: linear-gradient(135deg, #e63946, #ff6b6b);
}

/* 暗色模式 */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0d1117;
    --color-surface: #161b22;
    --color-text: #e6edf3;
    --color-text-secondary: #8b949e;
    --color-border: rgba(255,255,255,0.08);
    --color-glass: rgba(255,255,255,0.08);
    --color-glass-border: rgba(255,255,255,0.15);
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.4);
    --shadow-md: 0 8px 30px rgba(0,0,0,0.5);
    --shadow-lg: 0 20px 60px rgba(0,0,0,0.6);
    --gradient-card: linear-gradient(145deg, #1c2333, #0d1117);
  }
}

/* 滚动条美化 */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--color-bg);
}
::-webkit-scrollbar-thumb {
  background: var(--color-primary);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary-dark);
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* ===== 通用组件 ===== */
a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover {
  color: var(--color-primary-dark);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.3;
  font-weight: 700;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
}
h2 {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  margin-bottom: 1.5rem;
  position: relative;
  display: inline-block;
}
h2::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 60px;
  height: 4px;
  background: var(--gradient-accent);
  border-radius: 2px;
}
h3 {
  font-size: clamp(1.2rem, 3vw, 1.75rem);
  margin-bottom: 0.75rem;
}

p {
  margin-bottom: 1rem;
  color: var(--color-text-secondary);
}

ul, ol {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}
li {
  margin-bottom: 0.5rem;
}

section {
  padding: 4rem 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
}

/* ===== 毛玻璃卡片 ===== */
.glass-card {
  background: var(--color-glass);
  backdrop-filter: blur(20px) saturate(1.2);
  -webkit-backdrop-filter: blur(20px) saturate(1.2);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: 2rem;
  transition: all var(--transition);
}
.glass-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-light);
}

/* ===== 圆角卡片 ===== */
.card {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: 2rem;
  transition: all var(--transition);
  border: 1px solid var(--color-border);
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
}

/* ===== 渐变Banner ===== */
.gradient-banner {
  background: var(--gradient-banner);
  color: #fff;
  padding: 4rem 2rem;
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
}
.gradient-banner::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 50%, rgba(230,57,70,0.3) 0%, transparent 60%);
  animation: bannerGlow 8s ease-in-out infinite alternate;
}
@keyframes bannerGlow {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(10%, 10%) scale(1.1); }
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 2rem;
  background: var(--gradient-accent);
  color: #fff;
  border: none;
  border-radius: 50px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  box-shadow: 0 4px 15px rgba(230,57,70,0.3);
}
.btn:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 8px 25px rgba(230,57,70,0.4);
  color: #fff;
}
.btn:active {
  transform: scale(0.98);
}

/* ===== 滚动动画 ===== */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Header & Navigation ===== */
header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--color-glass);
  backdrop-filter: blur(30px) saturate(1.3);
  -webkit-backdrop-filter: blur(30px) saturate(1.3);
  border-bottom: 1px solid var(--color-glass-border);
  box-shadow: var(--shadow-sm);
  transition: background var(--transition);
}

nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
}

nav ul {
  display: flex;
  gap: 0.25rem;
  list-style: none;
  padding: 0;
  margin: 0;
  flex-wrap: wrap;
}

nav ul li {
  margin: 0;
}

nav ul li a {
  display: block;
  padding: 0.5rem 1rem;
  color: var(--color-text);
  font-weight: 500;
  border-radius: 50px;
  transition: all var(--transition);
  position: relative;
}

nav ul li a:hover {
  background: var(--color-primary);
  color: #fff;
  transform: translateY(-1px);
}

/* ===== Hero Section ===== */
#hero {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 3rem;
  padding: 5rem 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
  min-height: 70vh;
}

#hero > div {
  flex: 1;
}

#hero h1 {
  font-size: clamp(2.2rem, 6vw, 4rem);
  background: var(--gradient-banner);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1rem;
}

#hero p {
  font-size: 1.1rem;
  margin-bottom: 1.5rem;
}

#hero figure {
  flex: 1;
  max-width: 500px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  transition: transform var(--transition);
}
#hero figure:hover {
  transform: scale(1.02) rotate(-1deg);
}

#hero figure img {
  width: 100%;
  height: auto;
  display: block;
}

/* ===== Section 通用 ===== */
#about, #story, #team, #products, #services, #solutions, #industries,
#features, #advantages, #testimonials, #case-studies, #insights,
#knowledge-center, #faq, #howto, #contact {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  margin: 2rem auto;
  padding: 3rem 2rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}

#about:hover, #story:hover, #team:hover, #products:hover, #services:hover,
#solutions:hover, #industries:hover, #features:hover, #advantages:hover,
#testimonials:hover, #case-studies:hover, #insights:hover,
#knowledge-center:hover, #faq:hover, #howto:hover, #contact:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

/* ===== 产品卡片 ===== */
#products {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

#products h2 {
  grid-column: 1 / -1;
}

#products article {
  background: var(--gradient-card);
  border-radius: var(--radius-md);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  border: 1px solid var(--color-border);
}

#products article:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

/* ===== 评价区块 ===== */
#testimonials blockquote {
  background: var(--gradient-card);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-sm);
  padding: 1.5rem 2rem;
  margin: 1.5rem 0;
  transition: all var(--transition);
  box-shadow: var(--shadow-sm);
}
#testimonials blockquote:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-md);
}
#testimonials blockquote p {
  font-style: italic;
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}
#testimonials blockquote cite {
  font-style: normal;
  font-weight: 600;
  color: var(--color-primary);
}

/* ===== FAQ ===== */
#faq details {
  background: var(--gradient-card);
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
  padding: 1rem 1.5rem;
  cursor: pointer;
  transition: all var(--transition);
  border: 1px solid var(--color-border);
}
#faq details:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}
#faq details summary {
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--color-text);
  transition: color var(--transition);
}
#faq details[open] summary {
  color: var(--color-primary);
  margin-bottom: 0.75rem;
}
#faq details p {
  padding-left: 0.5rem;
  border-left: 2px solid var(--color-primary);
}

/* ===== Contact ===== */
#contact address {
  font-style: normal;
  background: var(--gradient-card);
  border-radius: var(--radius-md);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}
#contact address p {
  margin-bottom: 0.5rem;
}

/* ===== Footer ===== */
footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 2rem 1.5rem;
  text-align: center;
  margin-top: 4rem;
}

footer nav ul {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
  margin-bottom: 1.5rem;
}

footer nav ul li a {
  padding: 0.4rem 0.8rem;
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  border-radius: 50px;
  transition: all var(--transition);
}
footer nav ul li a:hover {
  background: var(--color-primary);
  color: #fff;
}

footer p {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.25rem;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  section {
    padding: 3rem 1rem;
  }
  #hero {
    flex-direction: column;
    text-align: center;
    padding: 3rem 1rem;
  }
  #hero figure {
    max-width: 100%;
  }
  #products {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  nav {
    flex-direction: column;
    gap: 0.75rem;
    padding: 0.5rem 1rem;
  }
  nav ul {
    justify-content: center;
    gap: 0.2rem;
  }
  nav ul li a {
    padding: 0.4rem 0.75rem;
    font-size: 0.9rem;
  }
  #hero {
    min-height: auto;
    padding: 2rem 1rem;
  }
  #hero h1 {
    font-size: 2rem;
  }
  #hero p {
    font-size: 1rem;
  }
  section {
    padding: 2rem 1rem;
    margin: 1rem auto;
  }
  #about, #story, #team, #products, #services, #solutions, #industries,
  #features, #advantages, #testimonials, #case-studies, #insights,
  #knowledge-center, #faq, #howto, #contact {
    padding: 2rem 1rem;
  }
  .glass-card, .card {
    padding: 1.25rem;
  }
  #testimonials blockquote {
    padding: 1rem 1.25rem;
  }
  footer nav ul {
    gap: 0.3rem;
  }
  footer nav ul li a {
    font-size: 0.8rem;
    padding: 0.3rem 0.6rem;
  }
}

@media (max-width: 480px) {
  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.35rem; }
  h3 { font-size: 1.1rem; }
  .btn {
    padding: 0.6rem 1.5rem;
    font-size: 0.9rem;
  }
  nav ul li a {
    font-size: 0.8rem;
    padding: 0.3rem 0.5rem;
  }
  #hero h1 {
    font-size: 1.6rem;
  }
  #hero p {
    font-size: 0.9rem;
  }
}

/* ===== 辅助动画 ===== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.animate-pulse {
  animation: pulse 2s ease-in-out infinite;
}

/* ===== 链接悬停下划线动画 ===== */
a:not(.btn):not(nav a):not(footer a) {
  position: relative;
}
a:not(.btn):not(nav a):not(footer a)::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-accent);
  transition: width var(--transition);
}
a:not(.btn):not(nav a):not(footer a):hover::after {
  width: 100%;
}

/* ===== 服务列表 ===== */
#services ul li, #solutions ul li, #industries ul li, #features ul li, #advantages ul li {
  background: var(--gradient-card);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  margin-bottom: 0.75rem;
  border-left: 3px solid var(--color-primary);
  transition: all var(--transition);
  list-style: none;
}
#services ul li:hover, #solutions ul li:hover, #industries ul li:hover,
#features ul li:hover, #advantages ul li:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-sm);
}

/* ===== 团队列表 ===== */
#team ul {
  list-style: none;
  padding: 0;
}
#team ul li {
  background: var(--gradient-card);
  border-radius: var(--radius-sm);
  padding: 1rem 1.5rem;
  margin-bottom: 0.75rem;
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}
#team ul li:hover {
  border-color: var(--color-primary);
  transform: translateX(6px);
}
#team ul li strong {
  color: var(--color-primary);
}

/* ===== 案例展示 ===== */
#case-studies article {
  background: var(--gradient-card);
  border-radius: var(--radius-sm);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}
#case-studies article:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

/* ===== 资讯区块 ===== */
#insights article {
  background: var(--gradient-card);
  border-radius: var(--radius-sm);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}
#insights article:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}
#insights time {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  background: var(--color-glass);
  padding: 0.2rem 0.8rem;
  border-radius: 50px;
  margin-top: 0.5rem;
}

/* ===== 知识中心 ===== */
#knowledge-center article {
  background: var(--gradient-card);
  border-radius: var(--radius-sm);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}
#knowledge-center article:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

/* ===== 下载指南 ===== */
#howto ol {
  list-style: none;
  counter-reset: step;
  padding: 0;
}
#howto ol li {
  counter-increment: step;
  background: var(--gradient-card);
  border-radius: var(--radius-sm);
  padding: 1rem 1.5rem 1rem 3rem;
  margin-bottom: 1rem;
  position: relative;
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}
#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  width: 30px;
  height: 30px;
  background: var(--gradient-accent);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
}
#howto ol li:hover {
  border-color: var(--color-primary);
  transform: translateX(6px);
}

/* ===== 选择理由 ===== */
#advantages ul {
  list-style: none;
  padding: 0;
}
#advantages ul li::before {
  content: '✓ ';
  color: var(--color-primary);
  font-weight: bold;
}

/* ===== 用户评价额外样式 ===== */
#testimonials {
  display: flex;
  flex-direction: column;
}

/* ===== 品牌故事特殊 ===== */
#story p:first-of-type::first-letter {
  font-size: 2.5em;
  float: left;
  line-height: 1;
  margin-right: 0.5rem;
  color: var(--color-primary);
  font-weight: bold;
}

/* ===== 暗色下细节优化 ===== */
@media (prefers-color-scheme: dark) {
  .gradient-banner {
    background: linear-gradient(135deg, #0d1117 0%, #161b22 40%, #1c2333 70%, #e63946 100%);
  }
  #hero h1 {
    background: linear-gradient(135deg, #e63946, #ff6b6b, #ffb3b3);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
  }
  .btn {
    box-shadow: 0 4px 15px rgba(230,57,70,0.5);
  }
}

/* ===== 打印样式 ===== */
@media print {
  header, footer, .btn, .animate-on-scroll {
    display: none;
  }
  body {
    background: #fff;
    color: #000;
  }
  section {
    box-shadow: none;
    border: 1px solid #ddd;
    break-inside: avoid;
  }
}