/* ===== 全局重置 & 变量 ===== */
:root {
  --bg: #f4f6f9;
  --text: #1a1a2e;
  --primary: #e94560;
  --secondary: #0f3460;
  --accent: #16213e;
  --card-bg: #ffffff;
  --shadow: 0 4px 20px rgba(0,0,0,0.08);
  --radius: 16px;
  --nav-bg: rgba(255,255,255,0.95);
  --footer-bg: #16213e;
  --footer-text: #e0e0e0;
  --heading-font: 'Georgia', 'Times New Roman', serif;
  --body-font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --transition-speed: 0.3s;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f0f23;
    --text: #eaeaea;
    --card-bg: #1a1a2e;
    --shadow: 0 4px 20px rgba(0,0,0,0.4);
    --nav-bg: rgba(15,15,35,0.95);
    --footer-bg: #0a0a1a;
    --footer-text: #b0b0c0;
  }
}
* { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--body-font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  transition: background var(--transition-speed), color var(--transition-speed);
}
a { color: var(--primary); text-decoration:none; transition: color 0.2s; }
a:hover { text-decoration:underline; color: #d63447; }
img { max-width:100%; height:auto; display:block; }
.container { max-width:1200px; margin:0 auto; padding:0 20px; }

/* ===== 头部导航 ===== */
.site-header {
  position: sticky;
  top:0;
  z-index:100;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom:1px solid rgba(233,69,96,0.15);
  transition: background var(--transition-speed);
}
.header-inner {
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:12px 20px;
  max-width:1200px;
  margin:0 auto;
}
.logo {
  font-size:1.6rem;
  font-weight:700;
  color: var(--primary);
  letter-spacing:1px;
  font-family: var(--heading-font);
}
.logo span { color: var(--text); transition: color var(--transition-speed); }
.nav-menu {
  display:flex;
  gap:24px;
  list-style:none;
  font-weight:500;
}
.nav-menu a {
  color: var(--text);
  padding:6px 0;
  border-bottom:2px solid transparent;
  transition: border-color 0.2s, color 0.2s;
}
.nav-menu a:hover { border-color: var(--primary); text-decoration:none; color: var(--primary); }
.mobile-toggle {
  display:none;
  background:none;
  border:none;
  font-size:1.8rem;
  color: var(--text);
  cursor:pointer;
  padding:4px 8px;
  border-radius:8px;
  transition: background 0.2s;
}
.mobile-toggle:hover { background: rgba(0,0,0,0.05); }

/* ===== 英雄区（渐变Banner） ===== */
.hero {
  padding:80px 20px 60px;
  text-align:center;
  background: linear-gradient(135deg, var(--secondary) 0%, var(--accent) 100%);
  color:#fff;
  border-radius:0 0 40px 40px;
  margin-bottom:40px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 40%, rgba(233,69,96,0.2) 0%, transparent 60%);
  animation: heroGlow 8s ease-in-out infinite alternate;
}
@keyframes heroGlow {
  0% { transform: translate(0, 0); }
  100% { transform: translate(10%, 10%); }
}
.hero h1 {
  font-size:2.8rem;
  font-weight:800;
  margin-bottom:16px;
  font-family: var(--heading-font);
  line-height:1.2;
  position: relative;
  z-index: 1;
}
.hero p {
  font-size:1.2rem;
  max-width:700px;
  margin:0 auto 28px;
  opacity:0.9;
  position: relative;
  z-index: 1;
}
.hero-cta {
  display:inline-block;
  background: var(--primary);
  color:#fff;
  padding:14px 40px;
  border-radius:50px;
  font-weight:600;
  font-size:1.1rem;
  transition: transform 0.2s, box-shadow 0.2s;
  position: relative;
  z-index: 1;
}
.hero-cta:hover { 
  transform:translateY(-2px); 
  box-shadow:0 8px 25px rgba(233,69,96,0.4); 
  text-decoration:none;
  color: #fff;
}

/* ===== 通用区块 ===== */
section { padding:60px 0; }
.section-title {
  font-size:2rem;
  font-weight:700;
  margin-bottom:32px;
  text-align:center;
  font-family: var(--heading-font);
  position:relative;
}
.section-title:after {
  content:'';
  display:block;
  width:60px;
  height:4px;
  background: var(--primary);
  margin:12px auto 0;
  border-radius:4px;
  transition: width 0.4s;
}
.section-title:hover:after { width: 100px; }

/* ===== 网格布局 ===== */
.grid-2, .grid-3, .grid-4 {
  display:grid;
  gap:24px;
}
.grid-2 { grid-template-columns:repeat(2,1fr); }
.grid-3 { grid-template-columns:repeat(3,1fr); }
.grid-4 { grid-template-columns:repeat(4,1fr); }

/* ===== 卡片（圆角+毛玻璃效果） ===== */
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding:24px;
  box-shadow: var(--shadow);
  transition: transform 0.3s, box-shadow 0.3s, background var(--transition-speed);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  border: 1px solid rgba(255,255,255,0.1);
}
.card:hover { 
  transform:translateY(-6px); 
  box-shadow: 0 12px 30px rgba(0,0,0,0.12);
}
.card h3 { font-size:1.3rem; margin-bottom:12px; color: var(--primary); }
.card p { font-size:0.95rem; opacity:0.85; }

/* ===== 关于/故事 ===== */
.about-content {
  max-width:800px;
  margin:0 auto;
  text-align:center;
  font-size:1.05rem;
}
.about-content p { margin-bottom:16px; }
.story-block {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding:32px;
  box-shadow: var(--shadow);
  max-width:900px;
  margin:0 auto;
  transition: transform 0.3s, box-shadow 0.3s;
}
.story-block:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(0,0,0,0.1);
}

/* ===== 图标特性 ===== */
.icon-feature { font-size:2.2rem; margin-bottom:8px; display:block; }

/* ===== 推荐卡片（左框线） ===== */
.testimonial-card {
  background: var(--card-bg);
  border-left:4px solid var(--primary);
  padding:20px 24px;
  border-radius:0 var(--radius) var(--radius) 0;
  box-shadow: var(--shadow);
  transition: transform 0.3s, border-left-color 0.3s;
}
.testimonial-card:hover {
  transform: translateX(6px);
  border-left-color: #d63447;
}
.testimonial-card cite { display:block; margin-top:12px; font-style:normal; font-weight:600; opacity:0.7; }

/* ===== FAQ手风琴 ===== */
.faq-item {
  border-bottom:1px solid rgba(0,0,0,0.08);
  padding:16px 0;
  transition: background 0.2s;
}
.faq-item:hover { background: rgba(233,69,96,0.03); }
.faq-question {
  font-weight:600;
  cursor:pointer;
  display:flex;
  justify-content:space-between;
  align-items:center;
  font-size:1.05rem;
  user-select: none;
}
.faq-question:after {
  content:'+';
  font-size:1.4rem;
  transition: transform 0.3s;
}
.faq-item.active .faq-question:after { content:'−'; transform: rotate(180deg); }
.faq-answer {
  max-height:0;
  overflow:hidden;
  transition: max-height 0.4s ease, padding-top 0.4s ease;
  padding-top:0;
  opacity:0.8;
}
.faq-item.active .faq-answer {
  max-height:300px;
  padding-top:12px;
}

/* ===== HowTo步骤 ===== */
.howto-step {
  display:flex;
  gap:16px;
  margin-bottom:20px;
  align-items:flex-start;
  transition: transform 0.2s;
}
.howto-step:hover { transform: translateX(8px); }
.howto-step-num {
  background: var(--primary);
  color:#fff;
  width:36px;
  height:36px;
  border-radius:50%;
  display:flex;
  align-items:center;
  justify-content:center;
  font-weight:700;
  flex-shrink:0;
}

/* ===== 联系方式卡片 ===== */
.contact-info p { margin-bottom:8px; }

/* ===== 页脚 ===== */
.site-footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  padding:40px 20px 20px;
  margin-top:40px;
  transition: background var(--transition-speed), color var(--transition-speed);
}
.footer-grid {
  display:grid;
  grid-template-columns:repeat(auto-fit, minmax(180px,1fr));
  gap:32px;
  max-width:1200px;
  margin:0 auto;
}
.footer-grid h4 { color:#fff; margin-bottom:12px; font-size:1.1rem; }
.footer-grid a { color: var(--footer-text); display:block; margin-bottom:6px; transition: color 0.2s; }
.footer-grid a:hover { color: var(--primary); text-decoration: none; }
.footer-bottom {
  border-top:1px solid rgba(255,255,255,0.1);
  margin-top:32px;
  padding-top:16px;
  text-align:center;
  font-size:0.9rem;
}

/* ===== 回到顶部按钮 ===== */
.back-to-top {
  position:fixed;
  bottom:30px;
  right:30px;
  background: var(--primary);
  color:#fff;
  width:48px;
  height:48px;
  border-radius:50%;
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:1.6rem;
  cursor:pointer;
  box-shadow:0 4px 12px rgba(0,0,0,0.3);
  opacity:0;
  transition: opacity 0.3s, transform 0.3s;
  border:none;
  z-index:99;
}
.back-to-top.visible { opacity:1; }
.back-to-top:hover { transform:scale(1.1); }

/* ===== Banner轮播 ===== */
.banner-carousel {
  position:relative;
  overflow:hidden;
  border-radius: var(--radius);
  margin-bottom:32px;
  background: var(--card-bg);
  box-shadow: var(--shadow);
  transition: box-shadow 0.3s;
}
.banner-carousel:hover { box-shadow: 0 8px 30px rgba(0,0,0,0.12); }
.banner-slide {
  display:none;
  padding:40px 32px;
  text-align:center;
  animation: fadeSlide 0.5s ease;
}
@keyframes fadeSlide {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}
.banner-slide.active { display:block; }
.banner-slide h2 { font-size:1.8rem; margin-bottom:12px; }
.banner-dots {
  display:flex;
  justify-content:center;
  gap:8px;
  padding:12px 0;
}
.banner-dot {
  width:12px;
  height:12px;
  border-radius:50%;
  background:#ccc;
  cursor:pointer;
  border:none;
  transition: background 0.3s, transform 0.2s;
}
.banner-dot.active { background: var(--primary); transform: scale(1.2); }
.banner-dot:hover { background: #aaa; }

/* ===== 暗色模式切换按钮 ===== */
.dark-toggle {
  background:none;
  border:2px solid var(--text);
  border-radius:30px;
  padding:6px 14px;
  color: var(--text);
  cursor:pointer;
  font-size:0.9rem;
  font-weight:500;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}
.dark-toggle:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(233,69,96,0.05);
}

/* ===== 搜索框 ===== */
.search-box {
  display:flex;
  gap:8px;
  max-width:400px;
  margin:20px auto;
}
.search-box input {
  flex:1;
  padding:10px 16px;
  border:2px solid #ddd;
  border-radius:30px;
  font-size:1rem;
  background: var(--card-bg);
  color: var(--text);
  transition: border-color 0.3s;
}
.search-box input:focus { border-color: var(--primary); outline: none; }
.search-box button {
  padding:10px 20px;
  background: var(--primary);
  color:#fff;
  border:none;
  border-radius:30px;
  cursor:pointer;
  font-weight:600;
  transition: background 0.2s, transform 0.2s;
}
.search-box button:hover { background: #d63447; transform: scale(1.02); }
.search-results { margin-top:20px; }
.search-result-item { 
  padding:12px; 
  border-bottom:1px solid rgba(0,0,0,0.05);
  transition: background 0.2s;
}
.search-result-item:hover { background: rgba(233,69,96,0.03); }

/* ===== 统计数字 ===== */
.stat-number { 
  font-size:2.4rem; 
  font-weight:800; 
  color: var(--primary);
  transition: color 0.3s;
}
.stat-label { font-size:0.95rem; opacity:0.75; }
.text-center { text-align: center; }

/* ===== 可访问性 ===== */
:focus-visible { outline:3px solid var(--primary); outline-offset:2px; }
@media (prefers-reduced-motion: reduce) {
  * { animation-duration:0.01ms !important; transition-duration:0.01ms !important; }
}

/* ===== 滚动动画（配合Intersection Observer） ===== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== 响应式 ===== */
@media (max-width:768px) {
  .nav-menu { 
    display:none; 
    flex-direction:column; 
    background: var(--nav-bg); 
    position:absolute; 
    top:60px; 
    left:0; 
    right:0; 
    padding:20px; 
    gap:16px; 
    border-bottom:1px solid var(--primary);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
  }
  .nav-menu.open { display:flex; }
  .mobile-toggle { display:block; }
  .hero h1 { font-size:2rem; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns:1fr; }
  .section-title { font-size:1.6rem; }
  .hero { padding:60px 20px 40px; }
  section { padding:40px 0; }
  .banner-slide { padding:24px 16px; }
  .banner-slide h2 { font-size:1.4rem; }
}
@media (min-width:769px) {
  .mobile-toggle { display:none; }
}
@media (max-width:480px) {
  .hero h1 { font-size:1.6rem; }
  .hero p { font-size:1rem; }
  .logo { font-size:1.3rem; }
  .card { padding:16px; }
  .section-title { font-size:1.3rem; }
  .stat-number { font-size:1.8rem; }
}