/* style.css - 米兰体育官方登录入口 (Milan Sports) */
/* 全局重置与变量 */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg: #f0f4f8;
  --bg-card: rgba(255,255,255,0.75);
  --text: #1a1a2e;
  --text-secondary: #4a4a6a;
  --accent: #e94560;
  --accent-hover: #d63850;
  --gradient: linear-gradient(135deg, #1a1a2e, #16213e);
  --shadow: 0 8px 32px rgba(0,0,0,0.08);
  --radius: 20px;
  --max-width: 1200px;
  --nav-height: 64px;
  --glass-bg: rgba(255,255,255,0.2);
  --glass-border: rgba(255,255,255,0.3);
}
body.dark {
  --bg: #0a0a14;
  --bg-card: rgba(26,26,46,0.85);
  --text: #e0e0e0;
  --text-secondary: #a0a0c0;
  --shadow: 0 8px 32px rgba(0,0,0,0.6);
  --glass-bg: rgba(0,0,0,0.3);
  --glass-border: rgba(255,255,255,0.1);
}
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  transition: background 0.4s ease, color 0.4s ease;
  min-height: 100vh;
}
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* 滚动动画基础 */
.fade-in-up { opacity: 0; transform: translateY(30px); transition: opacity 0.7s ease, transform 0.7s ease; }
.fade-in-up.visible { opacity: 1; transform: translateY(0); }

/* Header 毛玻璃效果 */
header {
  position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
  background: var(--glass-bg);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--glass-border);
  transition: background 0.4s, border-color 0.4s;
}
body.dark header { background: rgba(10,10,20,0.8); border-bottom-color: rgba(255,255,255,0.05); }
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: var(--nav-height); max-width: var(--max-width); margin: 0 auto; padding: 0 24px;
}
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 700; font-size: 1.25rem; color: var(--text); transition: opacity 0.2s; }
.logo:hover { opacity: 0.85; }
.logo svg { width: 36px; height: 36px; filter: drop-shadow(0 2px 4px rgba(0,0,0,0.1)); }
.logo span { background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
nav { display: flex; align-items: center; gap: 6px; }
nav a {
  text-decoration: none; color: var(--text-secondary); padding: 8px 16px; border-radius: 40px;
  font-size: 0.9rem; font-weight: 500; transition: all 0.25s ease; position: relative;
  background: transparent; backdrop-filter: blur(4px);
}
nav a:hover, nav a.active { background: var(--accent); color: #fff; transform: translateY(-1px); box-shadow: 0 4px 12px rgba(233,69,96,0.3); }
.theme-toggle {
  background: var(--glass-bg); border: 1px solid var(--glass-border);
  color: var(--text-secondary); width: 38px; height: 38px; border-radius: 50%;
  cursor: pointer; font-size: 1.1rem; display: flex; align-items: center; justify-content: center;
  transition: 0.3s; margin-left: 8px; backdrop-filter: blur(4px);
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); transform: scale(1.08); }
.menu-btn { display: none; background: none; border: none; font-size: 1.6rem; color: var(--text); cursor: pointer; padding: 4px 8px; border-radius: 8px; transition: background 0.2s; }
.menu-btn:hover { background: var(--glass-bg); }
@media (max-width: 768px) {
  nav { display: none; flex-direction: column; position: absolute; top: var(--nav-height); left: 0; width: 100%; background: var(--glass-bg); backdrop-filter: blur(20px); padding: 16px 24px; gap: 6px; border-bottom: 1px solid var(--glass-border); box-shadow: var(--shadow); }
  nav.open { display: flex; }
  .menu-btn { display: block; }
  nav a { padding: 12px 16px; border-radius: 12px; }
}

/* Hero 渐变Banner + 毛玻璃 */
.hero {
  padding: 140px 0 100px; position: relative; overflow: hidden;
  background: linear-gradient(135deg, #0f0c29, #302b63, #24243e);
  text-align: center; color: #fff;
}
.hero::before {
  content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%;
  background: radial-gradient(circle at 30% 50%, rgba(233,69,96,0.15) 0%, transparent 60%),
              radial-gradient(circle at 70% 30%, rgba(100,100,255,0.1) 0%, transparent 50%);
  animation: heroGlow 12s ease-in-out infinite alternate;
  pointer-events: none;
}
@keyframes heroGlow { 0% { transform: translate(0,0) scale(1); } 100% { transform: translate(5%,5%) scale(1.05); } }
.hero .container { position: relative; z-index: 2; }
.hero h1 {
  font-size: clamp(2.2rem, 6vw, 3.6rem); font-weight: 800; line-height: 1.15; margin-bottom: 20px;
  background: linear-gradient(to right, #fff, #f0a0b0); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  text-shadow: 0 2px 20px rgba(0,0,0,0.3);
}
.hero p { font-size: 1.15rem; max-width: 640px; margin: 0 auto 36px; opacity: 0.9; backdrop-filter: blur(2px); }
.hero-buttons { display: flex; gap: 20px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 10px; padding: 16px 36px; border-radius: 60px;
  font-weight: 600; text-decoration: none; transition: all 0.3s cubic-bezier(0.25,0.46,0.45,0.94);
  border: none; cursor: pointer; font-size: 1rem; backdrop-filter: blur(4px);
}
.btn-primary {
  background: linear-gradient(135deg, #e94560, #d63850); color: #fff; box-shadow: 0 4px 20px rgba(233,69,96,0.4);
}
.btn-primary:hover { transform: translateY(-4px) scale(1.02); box-shadow: 0 12px 32px rgba(233,69,96,0.5); }
.btn-outline { background: rgba(255,255,255,0.1); border: 2px solid rgba(255,255,255,0.6); color: #fff; }
.btn-outline:hover { background: rgba(255,255,255,0.2); transform: translateY(-4px); border-color: #fff; }

/* Sections 通用 */
section { padding: 80px 0; position: relative; }
.section-title {
  text-align: center; font-size: clamp(1.6rem, 3.5vw, 2.4rem); font-weight: 700; margin-bottom: 12px;
  background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.section-sub { text-align: center; color: var(--text-secondary); max-width: 640px; margin: 0 auto 48px; font-size: 1.05rem; }

/* 卡片网格 + 毛玻璃卡片 */
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 28px; }
.card, .testimonial-card, .article-card {
  background: var(--bg-card); border-radius: var(--radius); padding: 32px 28px;
  box-shadow: var(--shadow); transition: all 0.4s cubic-bezier(0.25,0.46,0.45,0.94);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border); position: relative; overflow: hidden;
}
.card::before, .testimonial-card::before, .article-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  background: linear-gradient(135deg, rgba(233,69,96,0.03), transparent);
  opacity: 0; transition: opacity 0.4s; pointer-events: none;
}
.card:hover, .testimonial-card:hover, .article-card:hover {
  transform: translateY(-8px) scale(1.01); box-shadow: 0 20px 48px rgba(0,0,0,0.12);
}
.card:hover::before, .testimonial-card:hover::before, .article-card:hover::before { opacity: 1; }
.card-icon { font-size: 2.6rem; margin-bottom: 16px; display: block; }
.card h3, .article-card h3 { font-size: 1.2rem; margin-bottom: 10px; }
.card p, .article-card p { color: var(--text-secondary); font-size: 0.95rem; line-height: 1.7; }

/* 关于区域 */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
@media (max-width: 768px) { .about-grid { grid-template-columns: 1fr; gap: 32px; } }
.about-text h2 { font-size: 1.8rem; margin-bottom: 16px; background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.about-text p { color: var(--text-secondary); margin-bottom: 14px; font-size: 1rem; }
.about-image {
  background: var(--gradient); border-radius: var(--radius); height: 300px;
  display: flex; align-items: center; justify-content: center; color: #fff;
  font-size: 1.3rem; font-weight: 600; position: relative; overflow: hidden;
  box-shadow: 0 12px 40px rgba(0,0,0,0.15); backdrop-filter: blur(4px);
}
.about-image::after {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(circle at 20% 80%, rgba(233,69,96,0.2), transparent);
}

/* Testimonials */
.testimonial-card p { font-style: italic; margin-bottom: 20px; color: var(--text-secondary); font-size: 1rem; line-height: 1.7; }
.testimonial-author { display: flex; align-items: center; gap: 14px; }
.testimonial-author .avatar {
  width: 48px; height: 48px; border-radius: 50%; background: var(--gradient);
  display: flex; align-items: center; justify-content: center; color: #fff; font-weight: 700; font-size: 1.1rem;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

/* FAQ */
.faq-item { border-bottom: 1px solid rgba(0,0,0,0.06); padding: 18px 0; transition: border-color 0.3s; }
body.dark .faq-item { border-color: rgba(255,255,255,0.06); }
.faq-question {
  display: flex; justify-content: space-between; align-items: center; cursor: pointer;
  font-weight: 600; font-size: 1.05rem; padding: 8px 0; user-select: none; gap: 16px;
  transition: color 0.2s;
}
.faq-question:hover { color: var(--accent); }
.faq-question::after { content: '+'; font-size: 1.6rem; transition: transform 0.4s ease, color 0.3s; color: var(--accent); flex-shrink: 0; }
.faq-item.open .faq-question::after { transform: rotate(135deg); color: var(--accent-hover); }
.faq-answer {
  max-height: 0; overflow: hidden; transition: max-height 0.45s ease, padding 0.35s ease, opacity 0.3s;
  color: var(--text-secondary); padding: 0; opacity: 0;
}
.faq-item.open .faq-answer { max-height: 400px; padding: 14px 0; opacity: 1; }

/* HowTo */
.howto-step { display: flex; gap: 24px; margin-bottom: 32px; align-items: flex-start; }
.howto-step .step-num {
  width: 44px; height: 44px; border-radius: 50%; background: linear-gradient(135deg, var(--accent), #d63850);
  color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 700; flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(233,69,96,0.3); transition: transform 0.3s;
}
.howto-step:hover .step-num { transform: scale(1.1); }
.howto-step h4 { margin-bottom: 6px; font-size: 1.05rem; }
.howto-step p { color: var(--text-secondary); line-height: 1.7; }

/* Article */
.article-card .date { font-size: 0.8rem; color: var(--text-secondary); margin-bottom: 10px; letter-spacing: 0.3px; }
.article-card a { color: var(--accent); text-decoration: none; font-weight: 500; transition: color 0.2s, gap 0.2s; display: inline-flex; align-items: center; gap: 4px; }
.article-card a:hover { color: var(--accent-hover); gap: 8px; }

/* Contact */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
@media (max-width: 768px) { .contact-grid { grid-template-columns: 1fr; } }
.contact-info p { margin-bottom: 12px; display: flex; align-items: center; gap: 10px; font-size: 0.98rem; }
.contact-info strong { min-width: 80px; }

/* Footer */
footer {
  background: linear-gradient(135deg, #0f0c29, #1a1a2e, #16213e);
  color: rgba(255,255,255,0.8); padding: 64px 0 28px; position: relative;
}
footer::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px; background: linear-gradient(90deg, transparent, var(--accent), transparent); }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 40px; margin-bottom: 40px; }
.footer-col h4 { color: #fff; margin-bottom: 18px; font-size: 1rem; letter-spacing: 0.5px; }
.footer-col a { display: block; color: rgba(255,255,255,0.6); text-decoration: none; margin-bottom: 10px; font-size: 0.9rem; transition: color 0.2s, transform 0.2s; }
.footer-col a:hover { color: #fff; transform: translateX(4px); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); padding-top: 24px; text-align: center; font-size: 0.85rem; }
.footer-bottom a { color: rgba(255,255,255,0.6); text-decoration: none; margin: 0 8px; transition: color 0.2s; }
.footer-bottom a:hover { color: #fff; }

/* Back to top */
.back-to-top {
  position: fixed; bottom: 36px; right: 36px; width: 52px; height: 52px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), #d63850); color: #fff; border: none;
  cursor: pointer; font-size: 1.6rem; box-shadow: 0 8px 24px rgba(233,69,96,0.35);
  opacity: 0; visibility: hidden; transition: all 0.4s cubic-bezier(0.25,0.46,0.45,0.94);
  z-index: 999; display: flex; align-items: center; justify-content: center;
}
.back-to-top.visible { opacity: 1; visibility: visible; }
.back-to-top:hover { transform: translateY(-4px) scale(1.05); box-shadow: 0 12px 32px rgba(233,69,96,0.5); }

/* 响应式微调 */
@media (max-width: 480px) {
  .hero { padding: 120px 0 70px; }
  .hero h1 { font-size: 1.8rem; }
  .btn { padding: 14px 28px; font-size: 0.9rem; }
  .card, .testimonial-card, .article-card { padding: 24px 20px; }
  .section-title { font-size: 1.4rem; }
  .about-image { height: 220px; }
}
@media (min-width: 769px) and (max-width: 1024px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
}

/* 暗色模式微调 */
body.dark .card, body.dark .testimonial-card, body.dark .article-card {
  border-color: rgba(255,255,255,0.05);
}
body.dark .btn-outline { border-color: rgba(255,255,255,0.3); }
body.dark .hero h1 { background: linear-gradient(to right, #fff, #e0a0b0); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }

/* 滚动条美化 */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent-hover); }