/* 简单样式，响应式布局 */
:root{
  --accent:#7c3aed;
  --bg:linear-gradient(180deg, #f0f4f8, #ffffff); /* 冷色调渐变背景 */
  --bg-light:#f5f9ff; /* 辅助冷色调 */
  --text:#222;
  --muted:#666;
  --glass-bg: rgba(255,255,255,0.55);
  --glass-border: rgba(255,255,255,0.65);
  --glass-shadow: rgba(16,24,40,0.06);
  --gradient-1: #ff6b6b;
  --gradient-2: #4ecdc4;
  --gradient-3: #7c3aed;
  --card-shadow: 0 8px 32px rgba(0,0,0,0.1);
  --animation-timing: cubic-bezier(0.4, 0, 0.2, 1);
}
*{box-sizing:border-box}
body{
  font-family:Segoe UI, Roboto, Arial, sans-serif;
  color:var(--text);
  background:var(--bg);
  background-attachment:fixed; /* 固定渐变背景 */
  margin:0;
  line-height:1.5;
  min-height:100vh
}
.container{max-width:1000px;margin:0 auto;padding:1rem}
.site-header{
  background:rgba(255,255,255,0.7);
  border-bottom:1px solid rgba(0,0,0,0.04);position:sticky;top:0;z-index:10;backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px)}
.site-header .container{display:flex;align-items:center;justify-content:space-between}
.logo{font-size:1rem;margin:0}
.nav a{margin-left:1rem;color:var(--text);text-decoration:none}
.hero{
  background:
    linear-gradient(120deg, 
      rgba(255,107,107,0.15) 0%,
      rgba(78,205,196,0.15) 50%,
      rgba(124,58,237,0.15) 100%
    );
  padding:3rem 0;
  position:relative;
  overflow:hidden
}
.hero::before {
  content:'';
  position:absolute;
  width:100%;
  height:100%;
  top:0;
  left:0;
  background:
    radial-gradient(circle at 20% 20%, rgba(255,107,107,0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(124,58,237,0.15) 0%, transparent 50%);
  filter:blur(60px);
  z-index:0;
}
.hero-inner{text-align:center;display:flex;justify-content:center;position:relative}
.hero-card{max-width:720px;padding:2rem;border-radius:14px}

/* 通用毛玻璃样式 */
.glass{
  background:linear-gradient(180deg, 
    rgba(255,255,255,0.7), 
    rgba(255,255,255,0.5)
  );
  box-shadow:
    0 8px 30px var(--glass-shadow),
    0 1px 0 rgba(255,255,255,0.4) inset;
  border:1px solid var(--glass-border);
  backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px)
}
.glass:where(:hover){transform:none}
.hero-card.glass{
  transition:transform .25s ease, box-shadow .25s ease;
  background:linear-gradient(120deg, 
    rgba(255,255,255,0.7) 0%,
    rgba(255,255,255,0.6) 100%
  );
  border:1px solid rgba(255,255,255,0.8);
}
.hero-card.glass:hover{
  transform:translateY(-6px);
  box-shadow:
    0 18px 50px rgba(16,24,40,0.12),
    0 1px 0 rgba(255,255,255,0.4) inset;
}
.hero h2{margin:0 0 .5rem}
.lead{color:var(--muted)}
.btn{
  display:inline-block;
  margin-top:1rem;
  background:linear-gradient(120deg, var(--gradient-1), var(--gradient-3));
  color:#fff;
  padding:.7rem 1.2rem;
  border-radius:8px;
  text-decoration:none;
  transition:all .2s ease;
  box-shadow:0 4px 12px rgba(124,58,237,0.2);
}
.btn:hover {
  transform:translateY(-2px);
  box-shadow:0 6px 20px rgba(124,58,237,0.25);
}
.about,.career,.projects,.research,.contact{padding:2rem 0}
.note{background:#fff8e6;border-left:4px solid var(--accent);padding:.6rem;margin-bottom:1rem}
.grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1rem}
.card{/* 改为毛玻璃卡片 */
  background:linear-gradient(180deg, 
    rgba(255,255,255,0.75), 
    rgba(255,255,255,0.65)
  );
  padding:1.2rem;
  border-radius:12px;
  border:1px solid rgba(255,255,255,0.8);
  box-shadow:
    0 10px 30px var(--glass-shadow),
    0 1px 0 rgba(255,255,255,0.4) inset;
  backdrop-filter:blur(6px);
  -webkit-backdrop-filter:blur(6px);
  transition:all .2s ease;
  position:relative;
}
.card::before {
  content:'';
  position:absolute;
  inset:-1px;
  padding:1px;
  border-radius:12px;
  background:linear-gradient(
    120deg,
    transparent,
    rgba(var(--gradient-1),0.1),
    rgba(var(--gradient-2),0.1)
  );
  -webkit-mask:linear-gradient(#fff 0 0) content-box,
           linear-gradient(#fff 0 0);
  mask:linear-gradient(#fff 0 0) content-box,
       linear-gradient(#fff 0 0);
  -webkit-mask-composite:xor;
  mask-composite:exclude;
  pointer-events:none;
}
.card:hover{
  transform:translateY(-6px);
  box-shadow:
    0 20px 45px rgba(16,24,40,0.12),
    0 1px 0 rgba(255,255,255,0.4) inset;
}
.card h4{margin-top:0}
.thumbs{
  display:flex;
  gap:1rem;
  flex-wrap:wrap;
  margin:1.5rem 0;
}
.thumbs .thumb-link{
  flex:1 1 calc(33% - 0.7rem);
  min-width:180px;
  display:block;
  text-decoration:none;
}
.thumbs .thumb-link img{
  width:100%;
  height:200px;
  object-fit:cover;
  border-radius:12px;
  border:1px solid rgba(255,255,255,0.8);
  box-shadow:0 6px 18px rgba(16,24,40,0.06);
  transition:all 0.3s var(--animation-timing);
  cursor:pointer;
}
.thumbs .thumb-link img:hover {
  transform:scale(1.02) translateY(-4px);
  box-shadow:0 12px 24px rgba(0,0,0,0.15);
  border-color:rgba(255,255,255,0.9);
}
.thumbs .thumb-link:focus-visible img{
  transform:scale(1.02) translateY(-4px);
  box-shadow:0 12px 24px rgba(0,0,0,0.18);
  border-color:var(--gradient-3);
  outline:3px solid rgba(124,58,237,0.35);
  outline-offset:4px;
}
.process{
  background:linear-gradient(180deg,
    rgba(255,255,255,0.85),
    rgba(255,255,255,0.7)
  );
  border:1px solid rgba(255,255,255,0.85);
  border-radius:10px;
  padding:1rem 1.2rem;
  margin:0 0 1.2rem;
  box-shadow:0 6px 20px rgba(16,24,40,0.08);
}
.process h5{
  margin:0 0 .6rem;
  font-size:1rem;
  letter-spacing:0.02em;
  text-transform:uppercase;
  color:var(--text);
}
.process ul{
  margin:0;
  padding-left:1.1rem;
  font-size:.92rem;
  color:var(--muted);
  display:grid;
  gap:.35rem;
  list-style:disc;
}
.process li::marker{
  color:var(--gradient-3);
}
.research{
  padding-bottom:3rem;
}
.research-intro{
  max-width:720px;
  color:var(--muted);
}
.research-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit, minmax(280px, 1fr));
  gap:1.2rem;
  margin-top:1.5rem;
}
.research-card{
  padding:1.4rem;
  border-radius:12px;
  min-height:220px;
  display:flex;
  flex-direction:column;
  gap:.75rem;
}
.research-card h4{
  margin:0;
}
.resource-link{
  margin-top:auto;
  color:var(--gradient-3);
  font-weight:600;
  text-decoration:none;
}
.resource-link:hover{
  text-decoration:underline;
}
.references-note{
  color:var(--muted);
  max-width:720px;
}
.reference-list{
  margin:1.2rem 0 0;
  padding-left:1.4rem;
  display:grid;
  gap:.8rem;
  color:var(--muted);
  font-size:.95rem;
}
.statement{font-size:.95rem;color:var(--muted)}
.product-caption{
  font-size:.9rem;
  color:var(--muted);
  font-style:italic;
  line-height:1.5;
  margin:-.3rem 0 1rem;
}
.contact form{display:grid;gap:.5rem;max-width:520px}
.contact label{display:flex;flex-direction:column;font-size:.95rem}
input,textarea{padding:.5rem;border:1px solid #ddd;border-radius:4px}
.form-msg{color:green}
.site-footer{
  border-top:1px solid rgba(255,255,255,0.8);
  background:rgba(255,255,255,0.5);
  padding:1.5rem 0;
  margin-top:3rem;
  backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);
}

/* 图片模态框样式 */
.modal {
  position:fixed;
  top:0;
  left:0;
  width:100%;
  height:100%;
  background:rgba(0,0,0,0.85);
  display:none;
  justify-content:center;
  align-items:center;
  z-index:1000;
  backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);
}

.modal.active {
  display:flex;
  animation:modalFadeIn 0.3s var(--animation-timing);
}

.modal-content {
  position:relative;
  max-width:90%;
  max-height:90vh;
  border-radius:16px;
  overflow:hidden;
  padding:8px;
}

.modal-content img {
  max-width:100%;
  max-height:85vh;
  object-fit:contain;
  border-radius:8px;
  display:block;
}

.modal-close {
  position:absolute;
  top:16px;
  right:16px;
  background:rgba(255,255,255,0.9);
  border:none;
  width:32px;
  height:32px;
  border-radius:50%;
  cursor:pointer;
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:24px;
  color:var(--text);
  transition:all 0.2s ease;
  z-index:1;
}

.modal-close:hover {
  background:white;
  transform:scale(1.1);
}

/* 视频展示区样式 */
.video-showcase {
  margin: 1.5rem 0 0;
  padding: 1.5rem;
  border-radius: 12px;
  background: linear-gradient(
    to bottom right,
    rgba(255,255,255,0.9),
    rgba(255,255,255,0.7)
  );
  border: 1px solid rgba(255,255,255,0.8);
}

.video-showcase h4 {
  margin-top: 0;
  margin-bottom: 1.5rem;
  font-size: 1.5rem;
  background: linear-gradient(120deg, var(--gradient-1), var(--gradient-3));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.video-container {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%; /* 16:9 比例 */
  margin-bottom: 2rem;
  border-radius: 12px;
  overflow: hidden;
  background: rgba(0,0,0,0.05);
  box-shadow: 0 8px 32px rgba(0,0,0,0.1);
  transition: transform 0.3s var(--animation-timing);
}

.video-container:hover {
  transform: scale(1.01);
}

.video-container:last-child {
  margin-bottom: 0;
}

.video-container video,
.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: 12px;
  object-fit: cover;
  background: #000;
}

/* 视频控制器美化 */
video::-webkit-media-controls-panel {
  background: linear-gradient(
    to top,
    rgba(0,0,0,0.7),
    rgba(0,0,0,0.4)
  );
}

/* YouTube 容器特殊样式 */
.youtube-container {
  background: #000;
}

@keyframes modalFadeIn {
  from {
    opacity:0;
    transform:scale(0.95);
  }
  to {
    opacity:1;
    transform:scale(1);
  }
}

@media (max-width:800px){
  .grid{grid-template-columns:1fr}
  .nav{display:none}
  .thumbs .thumb-link{flex:1 1 100%;min-width:0}
  .thumbs .thumb-link img{height:180px}
  .site-header .container{padding:0 1rem}
  .process{padding:.9rem 1rem;margin-bottom:1rem}
  .process ul{gap:.25rem}
  .research-grid{grid-template-columns:1fr}
}