/* ===== 米兰体育 (MILANSPORT) 完整样式 ===== */

/* 1. CSS变量与全局重置 */
:root {
  --primary: #cc0000;
  --primary-dark: #990000;
  --accent: #ffd700;
  --bg: #f8f9fa;
  --text: #1a1a2e;
  --card-bg: #ffffff;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  --radius: 16px;
  --transition: 0.3s ease;
  --max-width: 1200px;
  --nav-height: 70px;
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --gradient-hero: linear-gradient(135deg, #cc0000 0%, #990000 50%, #1a1a2e 100%);
  --gradient-accent: linear-gradient(135deg, #cc0000, #1a1a2e);
  --glass-bg: rgba(255, 255, 255, 0.15);
  --glass-border: rgba(255, 255, 255, 0.2);
  --footer-bg: #1a1a2e;
  --footer-text: rgba(255, 255, 255, 0.8);
}

.dark-mode {
  --bg: #0d0d1a;
  --text: #e8e8f0;
  --card-bg: #1a1a2e;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  --footer-bg: #0a0a14;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  transition: background var(--transition), color var(--transition);
}

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

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

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

/* 2. 工具类 */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

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

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.grid {
  display: grid;
  gap: 30px;
}

/* 3. 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.1);
  opacity: 0;
  transition: opacity var(--transition);
}

.btn:hover::after {
  opacity: 1;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(204, 0, 0, 0.3);
}

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

.btn-outline:hover {
  background: var(--primary);
  color: #fff;
  transform: translateY(-2px);
}

/* 4. 区块通用 */
.section {
  padding: 80px 0;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 12px;
  letter-spacing: -0.5px;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 60px;
  height: 4px;
  background: var(--primary);
  border-radius: 2px;
}

.text-center .section-title::after {
  left: 50%;
  transform: translateX(-50%);
}

.section-subtitle {
  font-size: 1.1rem;
  color: #555;
  margin-bottom: 40px;
  max-width: 700px;
  transition: color var(--transition);
}

.dark-mode .section-subtitle {
  color: #aaa;
}

/* 5. 卡片 */
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 30px;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.12);
}

/* 6. 标签 */
.tag {
  display: inline-block;
  background: rgba(204, 0, 0, 0.1);
  color: var(--primary);
  padding: 4px 12px;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 12px;
  transition: background var(--transition);
}

.dark-mode .tag {
  background: rgba(204, 0, 0, 0.2);
}

/* 7. 头部导航 */
#header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
  transition: all var(--transition);
  height: var(--nav-height);
  display: flex;
  align-items: center;
}

.dark-mode #header {
  background: rgba(13, 13, 26, 0.95);
}

#header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

#header a[href="/"] {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--primary);
  text-decoration: none;
}

#header a[href="/"] svg {
  flex-shrink: 0;
}

#main-nav {
  display: flex;
  align-items: center;
  gap: 30px;
}

#main-nav a {
  font-weight: 500;
  color: var(--text);
  text-decoration: none;
  transition: color var(--transition);
  position: relative;
}

#main-nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width var(--transition);
}

#main-nav a:hover::after,
#main-nav a[style*="color: var(--primary)"]::after {
  width: 100%;
}

#theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1.3rem;
  padding: 5px;
  color: var(--text);
  transition: color var(--transition);
}

#mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 1.8rem;
  cursor: pointer;
  color: var(--text);
  transition: color var(--transition);
}

/* 8. Hero 区域 */
#hero {
  padding: 140px 0 80px;
  background: var(--gradient-hero);
  color: #fff;
  position: relative;
  overflow: hidden;
}

#hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: rgba(255, 215, 0, 0.08);
  pointer-events: none;
}

#hero .container {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 50px;
  flex-wrap: wrap;
}

#hero .container > div:first-child {
  flex: 1;
  min-width: 280px;
}

#hero .container > div:last-child {
  flex: 0 0 300px;
  text-align: center;
}

#hero .tag {
  display: inline-block;
  background: var(--glass-bg);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 20px;
  color: #fff;
}

#hero h1 {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -1px;
}

#hero h1 span {
  color: var(--accent);
}

#hero p {
  font-size: 1.2rem;
  opacity: 0.9;
  max-width: 550px;
  margin-bottom: 30px;
  line-height: 1.6;
}

#hero .btn-primary {
  background: #fff;
  color: var(--primary);
}

#hero .btn-outline {
  border-color: #fff;
  color: #fff;
}

#hero .btn-outline:hover {
  background: #fff;
  color: var(--primary);
}

/* 9. About 区域 */
#about .grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

#about .grid-2 > div:last-child {
  background: var(--gradient-accent);
  border-radius: var(--radius);
  padding: 40px;
  color: #fff;
  text-align: center;
  transition: transform var(--transition);
}

#about .grid-2 > div:last-child:hover {
  transform: scale(1.02);
}

#about h3 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 16px;
}

#about p {
  margin-bottom: 16px;
  font-size: 1.05rem;
}

/* 10. Services 区域 */
#services {
  background: var(--card-bg);
  transition: background var(--transition);
}

#services .grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 30px;
}

#services .card {
  text-align: center;
}

#services .card div:first-child {
  font-size: 2.5rem;
  margin-bottom: 15px;
}

#services .card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 10px;
}

#services .card p {
  color: #555;
  font-size: 0.95rem;
  transition: color var(--transition);
}

.dark-mode #services .card p {
  color: #aaa;
}

/* 11. Advantages 区域 */
#advantages .grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 25px;
}

#advantages .advantage-item {
  display: flex;
  gap: 15px;
  align-items: flex-start;
  background: var(--card-bg);
  padding: 25px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}

#advantages .advantage-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
}

#advantages .advantage-item span {
  font-size: 2rem;
  flex-shrink: 0;
}

#advantages .advantage-item h4 {
  font-weight: 700;
  margin-bottom: 5px;
}

#advantages .advantage-item p {
  font-size: 0.9rem;
  color: #555;
  transition: color var(--transition);
}

.dark-mode #advantages .advantage-item p {
  color: #aaa;
}

/* 12. Insights 区域 */
#insights {
  background: var(--card-bg);
  transition: background var(--transition);
}

#insights .grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

#insights .card span {
  display: inline-block;
  background: rgba(204, 0, 0, 0.08);
  color: var(--primary);
  padding: 4px 12px;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 12px;
}

#insights .card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
}

#insights .card p {
  font-size: 0.95rem;
  color: #555;
  margin-bottom: 15px;
  transition: color var(--transition);
}

.dark-mode #insights .card p {
  color: #aaa;
}

#insights .card a {
  font-weight: 600;
  font-size: 0.9rem;
}

/* 13. HowTo 区域 */
#howto .howto-card {
  max-width: 800px;
  margin: 0 auto;
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 40px;
  transition: background var(--transition);
}

#howto ol {
  list-style: none;
  counter-reset: step;
}

#howto li {
  counter-increment: step;
  margin-bottom: 30px;
  padding-left: 50px;
  position: relative;
}

#howto li:last-child {
  margin-bottom: 0;
}

#howto li span {
  position: absolute;
  left: 0;
  top: 0;
  width: 36px;
  height: 36px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
}

#howto li h3 {
  font-weight: 700;
  margin-bottom: 5px;
}

#howto li p {
  color: #555;
  transition: color var(--transition);
}

.dark-mode #howto li p {
  color: #aaa;
}

/* 14. FAQ 区域 */
#faq {
  background: var(--card-bg);
  transition: background var(--transition);
}

.faq-item {
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
  padding: 18px 0;
  transition: border-color var(--transition);
}

.dark-mode .faq-item {
  border-bottom-color: rgba(255, 255, 255, 0.08);
}

.faq-question {
  width: 100%;
  background: none;
  border: none;
  text-align: left;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 5px 0;
  color: var(--text);
  transition: color var(--transition);
}

.faq-question span:last-child {
  font-size: 1.3rem;
  transition: transform 0.3s;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
  padding: 0 10px;
}

.faq-answer p {
  padding: 10px 0;
  color: #555;
  transition: color var(--transition);
}

.dark-mode .faq-answer p {
  color: #aaa;
}

/* 15. Contact 区域 */
#contact .contact-card {
  max-width: 700px;
  margin: 0 auto;
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 40px;
  transition: background var(--transition);
}

#contact-form {
  display: grid;
  gap: 20px;
}

#contact-form label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
}

#contact-form input,
#contact-form textarea {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid #e0e0e0;
  border-radius: 10px;
  font-size: 1rem;
  background: var(--bg);
  color: var(--text);
  transition: border-color var(--transition), background var(--transition), color var(--transition);
}

.dark-mode #contact-form input,
.dark-mode #contact-form textarea {
  border-color: #333;
  background: #1a1a2e;
  color: #e8e8f0;
}

#contact-form input:focus,
#contact-form textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(204, 0, 0, 0.1);
}

#contact-form textarea {
  resize: vertical;
}

#contact-form .btn {
  justify-content: center;
  width: 100%;
}

.contact-info {
  margin-top: 30px;
  padding-top: 30px;
  border-top: 1px solid rgba(0, 0, 0, 0.08);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  text-align: center;
  transition: border-color var(--transition);
}

.dark-mode .contact-info {
  border-top-color: rgba(255, 255, 255, 0.08);
}

.contact-info div span {
  font-size: 1.5rem;
}

.contact-info div p {
  font-weight: 600;
  margin-top: 5px;
}

/* 16. Footer */
footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  padding: 60px 0 30px;
  transition: background var(--transition);
}

footer .grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 40px;
  margin-bottom: 40px;
}

footer h4 {
  color: #fff;
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 16px;
}

footer h4 + p {
  font-size: 0.9rem;
  line-height: 1.6;
}

footer ul {
  list-style: none;
  font-size: 0.9rem;
}

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

footer ul li a {
  color: rgba(255, 255, 255, 0.7);
  transition: color var(--transition);
}

footer ul li a:hover {
  color: #fff;
}

footer .footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 30px;
  text-align: center;
  font-size: 0.85rem;
}

footer .footer-bottom p:last-child {
  margin-top: 8px;
  opacity: 0.6;
}

/* 17. 返回顶部按钮 */
#back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  box-shadow: 0 4px 15px rgba(204, 0, 0, 0.3);
  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 {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(204, 0, 0, 0.4);
}

/* 18. 滚动动画 */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.slide-in-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.slide-in-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

/* 19. 毛玻璃效果 */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
}

/* 20. 响应式设计 */
@media (max-width: 1024px) {
  #hero h1 {
    font-size: 2.5rem;
  }

  #hero .container > div:last-child {
    flex: 0 0 250px;
  }

  #hero svg {
    width: 240px;
    height: 240px;
  }

  #about .grid-2 {
    grid-template-columns: 1fr;
    gap: 30px;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 50px 0;
  }

  .section-title {
    font-size: 1.7rem;
  }

  .grid {
    grid-template-columns: 1fr !important;
  }

  #header {
    height: 60px;
  }

  #header a[href="/"] {
    font-size: 1.2rem;
  }

  #header a[href="/"] svg {
    width: 30px;
    height: 30px;
  }

  #main-nav {
    display: none;
    flex-direction: column;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    padding: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    gap: 20px;
  }

  .dark-mode #main-nav {
    background: rgba(13, 13, 26, 0.98);
  }

  #mobile-menu-btn {
    display: block;
  }

  #hero {
    padding: 100px 0 60px;
  }

  #hero h1 {
    font-size: 2rem;
  }

  #hero p {
    font-size: 1rem;
  }

  #hero .container > div:last-child {
    flex: 0 0 200px;
  }

  #hero svg {
    width: 200px;
    height: 200px;
  }

  #hero .btn {
    width: 100%;
    justify-content: center;
  }

  .contact-info {
    grid-template-columns: 1fr;
  }

  #back-to-top {
    bottom: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
    font-size: 1.2rem;
  }

  footer .grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  footer .grid > div:first-child {
    text-align: center;
  }
}

@media (max-width: 480px) {
  #hero h1 {
    font-size: 1.6rem;
  }

  #hero .container > div:last-child {
    flex: 0 0 160px;
  }

  #hero svg {
    width: 160px;
    height: 160px;
  }

  .card {
    padding: 20px;
  }

  #howto .howto-card {
    padding: 25px;
  }

  #contact .contact-card {
    padding: 25px;
  }

  #howto li {
    padding-left: 40px;
  }

  #howto li span {
    width: 30px;
    height: 30px;
    font-size: 0.9rem;
  }
}

/* 21. 暗色模式额外适配 */
.dark-mode .card:hover {
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

.dark-mode #hero .btn-primary {
  background: #fff;
  color: var(--primary);
}

.dark-mode #hero .btn-outline {
  border-color: #fff;
  color: #fff;
}

.dark-mode #hero .btn-outline:hover {
  background: #fff;
  color: var(--primary);
}

/* 22. 打印样式 */
@media print {
  #header,
  #back-to-top,
  #mobile-menu-btn,
  #theme-toggle {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
  }

  .card {
    box-shadow: none;
    border: 1px solid #ddd;
  }

  #hero {
    padding: 20px 0;
    background: #fff !important;
    color: #000;
  }

  #hero h1 span {
    color: var(--primary);
  }

  .section {
    padding: 30px 0;
    page-break-inside: avoid;
  }
}