/* 基础主题 */
:root{
  --bg:#f8f9fa; /* 浅灰背景 */
  --card:#e9ecef; /* 卡片底色 */
  --muted:#6c757d; /* 次级文字 */
  --fg:#212529; /* 主要文字 */
  --pri:#495057; /* 深灰主色 */
  --pri-2:#343a40; /* 渐变强调 */
  --accent:#adb5bd; /* 点缀 */
}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;font:16px/1.6 ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial;color:var(--fg);background:radial-gradient(1000px 600px at 10% -10%,rgba(205,212,218,.6),transparent),radial-gradient(1000px 600px at 90% 10%,rgba(173,181,189,.4),transparent),var(--bg)}
a{color:inherit;text-decoration:none}
.container{max-width:1100px;margin:0 auto;padding:24px}

.accent-text{color:var(--pri);font-weight:600}
.accent-text-alt{color:var(--pri-2);font-weight:600}

/* 顶部英雄区 */
.hero{position:relative;border-radius:20px;overflow:hidden;padding:48px;background:linear-gradient(135deg,rgba(206,212,218,.8),rgba(222,226,230,.85));border:1px solid rgba(173,181,189,.5)}
.hero h1{margin:0;font-size:34px;letter-spacing:.2px;color:var(--pri-2)}
.hero p{margin:0;color:var(--muted)}
.hero .stat{display:flex;gap:18px;margin-top:20px}
.badge{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;background:rgba(173,181,189,.25);border:1px solid rgba(108,117,125,.25)}
.badge .dot{width:8px;height:8px;border-radius:50%;background:linear-gradient(135deg,var(--pri),var(--pri-2))}

.media-section{margin:28px 0;display:flex;justify-content:center}
.hero-gallery{position:relative;width:100%;max-width:100%;height:auto;border-radius:18px;overflow:hidden;border:1px solid rgba(173,181,189,.6);box-shadow:0 18px 40px rgba(52,58,64,.25);background:#ffffff}
.hero-gallery img{position:static;display:block;width:100%;height:auto;object-fit:contain;background:#ffffff;opacity:1;animation:none}
.hero-gallery img:nth-child(1){animation-delay:0s}
.hero-gallery img:nth-child(2){animation-delay:6s}

@keyframes heroSlide{
  0%{opacity:0}
  5%{opacity:1}
  45%{opacity:1}
  55%{opacity:0}
  100%{opacity:0}
}

/* 三大板块按钮 */
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:28px 0}
.card{position:relative;padding:22px;border-radius:16px;background:linear-gradient(180deg,rgba(233,236,239,.95),rgba(233,236,239,.75));border:1px solid rgba(173,181,189,.5);box-shadow:0 10px 30px rgba(73,80,87,.15);transition:transform .2s ease, box-shadow .2s ease}
.card:hover{transform:translateY(-3px);box-shadow:0 16px 40px rgba(52,58,64,.28)}
.card h3{margin:6px 0 8px;font-size:20px}
.card p{margin:0;color:var(--muted)}
.chip{position:absolute;right:14px;top:14px;font-size:12px;color:var(--fg);background:linear-gradient(135deg,#ced4da,#adb5bd);padding:4px 8px;border-radius:999px}
.btn{display:inline-flex;align-items:center;gap:8px;margin-top:14px;padding:10px 14px;border-radius:10px;background:linear-gradient(135deg,var(--pri),var(--pri-2));color:#f8f9fa;font-weight:600}

/* 可视化区 */
.section{margin:40px 0}
.section h2{margin:0 0 12px}
.viz{display:grid;grid-template-columns:1.2fr .8fr;gap:18px}
.viz-single{grid-template-columns:1fr}
.viz-alt{grid-template-columns:repeat(3,1fr)}
.panel{background:rgba(233,236,239,.9);border:1px solid rgba(173,181,189,.45);border-radius:16px;padding:12px}
.panel .title{display:flex;align-items:center;justify-content:space-between;margin:4px 6px 10px;color:var(--muted)}
.panel .canvas{height:360px;border-radius:12px;overflow:hidden;position:relative}
/* 3Dmol 在容器内创建绝对定位的 canvas，这里确保其被限制在容器内并铺满 */
.panel .canvas > canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
.canvas-message{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;padding:24px;text-align:center;color:var(--muted);font-size:14px;background:rgba(255,255,255,.65)}
.resource-list{display:flex;flex-direction:column;justify-content:center;align-items:flex-start;padding:24px;gap:18px;background:rgba(255,255,255,.7);height:auto;min-height:240px}
.resource-links{display:flex;flex-wrap:wrap;gap:12px}
.btn-link{padding:8px 14px;border-radius:999px;background:linear-gradient(135deg,var(--pri),var(--pri-2));color:#f8f9fa;font-weight:600;font-size:14px;transition:transform .2s ease, box-shadow .2s ease;box-shadow:0 6px 16px rgba(52,58,64,.2)}
.btn-link:hover{transform:translateY(-2px);box-shadow:0 10px 30px rgba(52,58,64,.25)}
.resource-text{margin:0;color:var(--muted);font-size:14px;line-height:1.5}
.iframe-wrapper{position:relative}
.iframe-wrapper iframe{position:absolute;inset:0;width:100%;height:100%;border:0}

/* 页脚 */
footer{margin:36px 0 16px;color:var(--muted);text-align:center}

/* 响应式 */
@media (max-width:900px){
  .viz{grid-template-columns:1fr}
  .viz-alt{grid-template-columns:1fr}
}
@media (max-width:600px){
  .grid{grid-template-columns:1fr}
}