:root{
  --grad-start:#8a5cff;
  --grad-end:#f54b9f;
  --card-bg:#ffffff;
  --text:#111827;
  --muted:#6b7280;
  --line:#e5e7eb;
  --panel:#f7f8fb;
  --radius:18px;
  --preview-ratio: 16/9;
  --stagger-offset: 24px;
  --preview-width: 720px;
  --preview-height: 500px;
  /* headern */
  --headern-bg: #000000;
  --headern-text: #ffffff;
  --headern-muted: #c9c9c9;
  --headern-height: 36px;
  --headern-max: 1540px;
  --headern-pad: 16px;
  --headern-radius: 10px;
  --headern-border: #1f1f1f;
  --headern-panel-bg: #ffffff;
  --headern-panel-text: #111827;
  --headern-panel-muted: #6b7280;
  --headern-panel-border: #e5e7eb;
}

/* -------------产品模块——-------------------- */
.product-module{
  max-width:1400px;
  margin:120px auto;
  display:flex;
  gap:48px;
  align-items:center;
  padding:8px;
}

.product-module.product-reverse{flex-direction:row-reverse; align-items:center}
.product-preview{
  flex:none;
}
.product-preview-media{
  width:var(--preview-width);
  height:var(--preview-height);
  display:block;
  border-radius:24px;
  box-shadow:0 12px 30px rgba(17,24,39,.12);
  overflow:hidden;
  background:#000;
}
.product-preview-img{
  width:100%;
  height:100%;
  display:block;
  object-fit:cover;
}
.product-card{
  background:var(--card-bg);
  border-radius:16px;
  overflow:hidden;
  box-shadow:0 12px 30px rgba(17,24,39,.12);
}
.product-titlebar{
  display:flex;
  align-items:center;
  gap:8px;
  padding:12px 16px;
  border-bottom:1px solid var(--line);
}
.product-dot{width:10px;height:10px;border-radius:50%}
.product-dot.product-red{background:#ff5f56}
.product-dot.product-yellow{background:#ffbd2e}
.product-dot.product-green{background:#27c93f}
.product-urlbar{
  margin:12px auto 14px;
  width:72%;
  height:34px;
  border:1px solid var(--line);
  border-radius:999px;
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:13px;
  color:#374151;
  background:#fafafa;
}
.product-app{display:flex;border-top:1px solid var(--line)}
.product-sidebar{
  width:190px;
  background:var(--panel);
  border-right:1px solid var(--line);
  padding:16px;
}
.product-logo{
  color:#5b67ff;
  font-weight:700;
  margin-bottom:12px;
}
.product-nav a{
  display:block;
  padding:8px 10px;
  border-radius:8px;
  color:#374151;
  text-decoration:none;
  margin-bottom:4px;
}
.product-nav a.product-active{background:#e9ecff;color:#3b4cff}
.product-main{flex:1;padding:14px 16px}
.product-search input{
  width:100%;
  height:34px;
  border:1px solid var(--line);
  border-radius:8px;
  padding:0 10px;
  font-size:13px;
}
.product-list{margin:12px 0 6px;padding:0;list-style:none}
.product-item{
  display:flex;
  align-items:center;
  gap:12px;
  padding:10px;
  border:1px solid var(--line);
  border-radius:10px;
  margin-bottom:8px;
  background:#fff;
}
.product-icon{
  width:30px;height:30px;border-radius:8px;
  background:linear-gradient(135deg,#60a5fa,#a78bfa);
}
.product-meta{flex:1}
.product-name{font-weight:600;font-size:14px}
.product-desc{font-size:12px;color:var(--muted)}
.product-action{
  border:1px solid #d1d5db;
  background:#f9fafb;
  border-radius:8px;
  padding:6px 10px;
  font-size:12px;
  color:#374151;
}
.product-content{
  flex:.9;
  margin-top: 0;
}
.product-module.product-reverse .product-content{margin-top:0}
.product-content h3{
  font-size:28px;
  margin:0 0 12px;
}
.product-content p{
  margin:0 0 16px;
  color:var(--muted);
  line-height:1.6;
}
.product-features{
  margin:0 0 8px;
  padding:0;
  list-style:none;
  display:grid;
  gap:10px;
}
.product-features li{
  display:flex;
  align-items:flex-start;
  gap:10px;
  font-size:14px;
}
.product-bullet{
  width:20px;height:20px;border-radius:50%;
  background:#e9ecff;color:#3b4cff;
  display:flex;align-items:center;justify-content:center;
  font-weight:700;line-height:1;
}
.product-more{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:8px 12px;
  border-radius:999px;
  border:1px solid #cfd6ff;
  background:transparent;
  color:#3b4cff;
  font-weight:600;
  text-decoration:none;
  line-height:1;
  transition:color .2s ease, border-color .2s ease;
}
  .product-more:hover{color:#1f2bd6;border-color:#1f2bd6}
  .product-more::after{content:"→";font-weight:700}
@media (max-width:980px){
  .product-module{flex-direction:column;gap:24px;margin:20px auto;padding:0}
  .product-module.product-reverse{flex-direction:column}
  .product-content{margin-top:0}
}
/* ————————————————————产品模块结束———————————————————————————————————— */

/* -------------页面顶部------------------- */
.headern {
    width: 100%;
    background: var(--headern-bg);
    color: var(--headern-text);
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    box-shadow: 0 1px 0 rgba(255, 255, 255, .08);
}

.headern-inner {
    max-width: var(--headern-max);
    height: var(--headern-height);
    margin: 0 auto;
    padding: 0 var(--headern-pad);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    font: 13px/1.2 system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
}

.headern-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--headern-text);
    text-decoration: none;
}

.headern-logo {
    font-weight: 800;
    letter-spacing: .2px;
}

.headern-sub {
    color: var(--headern-muted);
    font-weight: 600;
}

.headern-actions {
    display: flex;
    align-items: center;
    gap: 14px;
}

.headern-link {
    color: var(--headern-muted);
    text-decoration: none;
    transition: color .15s ease;
}

.headern-link:hover {
    color: var(--headern-text);
}

.headern-trigger {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--headern-muted);
    background: transparent;
    border: 0;
    padding: 0;
    margin: 0;
    cursor: pointer;
    transition: color .15s ease;
}

.headern-trigger:hover {
    color: var(--headern-text);
}

.headern-caret {
    transform: translateY(.5px);
}

.headern-dropdown {
    position: relative;
}

.headern-panel {
    position: absolute;
    right: 0;
    top: calc(100% + 8px);
    min-width: 260px;
    background: var(--headern-panel-bg);
    border: 1px solid var(--headern-panel-border);
    border-radius: 12px;
    padding: 8px;
    display: none;
    box-shadow: 0 10px 30px rgba(17, 24, 39, .12);
}

.headern-panel::before {
    content: "";
    position: absolute;
    right: 14px;
    top: -6px;
    border-width: 6px;
    border-style: solid;
    border-color: transparent transparent var(--headern-panel-bg) transparent;
}

.headern-dropdown.is-open .headern-panel {
    display: block;
}

.headern-item {
    display: block;
    padding: 10px 12px;
    border-radius: 8px;
    text-decoration: none;
}

.headern-item-title {
    display: block;
    color: var(--headern-panel-text);
    font-weight: 600;
}

.headern-item-desc {
    display: block;
    color: var(--headern-panel-muted);
    font-size: 12px;
    margin-top: 2px;
}

.headern-item:hover {
    background: #f5f7fa;
}

.headern-item:hover .headern-item-title {
    color: #0f172a;
}

@media (max-width: 768px) {
    .headern-inner {
        padding: 0 10px;
    }
    
    .headern-sub {
        display: none;
    }
    
    .headern-actions {
        gap: 10px;
    }
}