/* site-header.css - 全前台共享头部样式(默认白底 sticky 深色文字,内页用)
   首页透明态由首页内联 CSS 负责(不加载本文件) */
:root {
    --blue: #1e50ae; --blue-dark: #174090; --blue-light: #eef3fb; --blue-soft: #f3f6fc;
    --text: #222; --text-sub: #4b4b4b; --text-gray: #a9a9a9;
    --bg: #fff; --bg-soft: #f5f7fa; --border: #e8eaed;
}
.site-header a { text-decoration: none; }
.site-header { background: #fff; border-bottom: 1px solid var(--border); position: sticky; top: 0; left: 0; right: 0; z-index: 300; }
.header-inner { display: flex; align-items: center; height: 80px; gap: 24px; position: relative; }
.wrap { max-width: 1540px; margin: 0 auto; padding: 0 20px; }
.wrap.header-inner { max-width: 1400px; }
.header-logo { font-size: 22px; font-weight: 900; color: var(--blue); white-space: nowrap; display: flex; align-items: center; gap: 6px; }
.header-logo small { font-size: 11px; color: var(--text-gray); font-weight: 400; letter-spacing: 1px; }
.header-nav { display: flex; align-items: center; gap: 26px; flex: 1; }
.header-nav > a { font-size: 15px; color: var(--text); transition: color .2s; white-space: nowrap; position: relative; padding: 4px 0; display: inline-flex; align-items: center; gap: 4px; }
.header-nav > a:hover, .header-nav > a.active, .header-nav > a.mega-on { color: var(--blue); }
.header-nav > a[data-mega]::after { content: ""; display: inline-block; width: 0; height: 0; border-left: 4px solid transparent; border-right: 4px solid transparent; border-top: 5px solid currentColor; opacity: .5; margin-left: 2px; transition: transform .2s; }
.header-nav > a.mega-on[data-mega]::after { transform: rotate(180deg); opacity: 1; }
.header-cta { display: flex; align-items: center; gap: 14px; }
.btn-login { font-size: 14px; color: var(--text); }
.btn-login:hover { color: var(--blue); }
.btn-register { font-size: 13px; font-weight: 700; padding: 7px 20px; border-radius: 4px; background: var(--blue); color: #fff; transition: background .2s; }
.btn-register:hover { background: var(--blue-dark); }
.nav-toggle { display: none; width: 40px; height: 40px; border: none; background: none; cursor: pointer; flex-direction: column; gap: 5px; align-items: center; justify-content: center; }
.nav-toggle span { width: 22px; height: 2px; background: var(--text); border-radius: 2px; transition: transform .25s, opacity .25s; }
body.drawer-open .nav-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
body.drawer-open .nav-toggle span:nth-child(2) { opacity: 0; }
body.drawer-open .nav-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== Mega Menu ===== */
.mega { position: absolute; top: 100%; left: 50%; width: 1200px; max-width: calc(100vw - 40px); background: #fff;
    border-radius: 0 0 10px 10px; box-shadow: 0 18px 44px rgba(30,80,174,.18), 0 2px 10px rgba(0,0,0,.05);
    opacity: 0; visibility: hidden; transform: translateX(-50%) translateY(-10px); transition: opacity .2s ease, transform .2s ease, visibility .2s;
    pointer-events: none; z-index: 200; display: flex; flex-direction: column; overflow: hidden; border: 1px solid var(--border); border-top: none; }
.mega.open { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); pointer-events: auto; }
.mega-body { display: flex; }
.mega-left { width: 200px; flex-shrink: 0; background: var(--blue-soft); padding: 12px 0; }
.mega-left-title { padding: 8px 22px 10px; color: #8b96a9; font-size: 12px; font-weight: 700; letter-spacing: 1px; }
.mega-cat { padding: 12px 22px; font-size: 14px; color: var(--text-sub); cursor: pointer; display: flex; align-items: center; gap: 10px; border-left: 3px solid transparent; transition: background .15s, color .15s; }
.mega-cat .ico { width: 16px; height: 16px; stroke: currentColor; fill: none; stroke-width: 1.8; flex-shrink: 0; }
.mega-cat:hover, .mega-cat.active { background: #fff; color: var(--blue); font-weight: 700; border-left-color: var(--blue); }
.mega-right { flex: 1; padding: 22px 24px; background: #fff; min-height: 280px; }
.mega-pane { display: none; }
.mega-pane.active { display: block; animation: megaFade .2s ease; }
@keyframes megaFade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } }
.mega-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 4px 12px; }
.mega-grid.cols4 { grid-template-columns: repeat(4, 1fr); }
.mega-item { display: flex; align-items: center; gap: 10px; padding: 11px 12px; border-radius: 6px; color: var(--text-sub); font-size: 13px; transition: background .15s, color .15s; }
.mega-item .ico { width: 18px; height: 18px; stroke: currentColor; fill: none; stroke-width: 1.7; flex-shrink: 0; opacity: .8; }
.mega-item:hover { background: var(--blue-light); color: var(--blue); }
.mega-item:hover .ico { opacity: 1; }
.product-pane-head { margin-bottom: 18px; }
.product-pane-head h3 { color: #18243b; font-size: 19px; line-height: 1.35; margin-bottom: 5px; }
.product-pane-head p { color: #8b96a9; font-size: 13px; }
.product-options { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 14px; }
.product-options.two { grid-template-columns: repeat(2, minmax(0,1fr)); }
.product-card { min-height: 116px; padding: 18px; border: 1px solid #e5eaf3; border-radius: 10px; background: #fbfcff; transition: transform .2s, border-color .2s, box-shadow .2s; }
.product-card:hover { transform: translateY(-2px); border-color: #9eb7e4; box-shadow: 0 10px 24px rgba(30,80,174,.10); }
.product-card-top { display: flex; align-items: center; gap: 9px; margin-bottom: 9px; }
.product-card .ico { width: 20px; height: 20px; stroke: var(--blue); fill: none; stroke-width: 1.8; }
.product-card strong { color: #17243c; font-size: 15px; }
.product-card span { display: block; color: #758096; font-size: 12px; line-height: 1.7; }
.mega-foot { padding: 12px 24px; border-top: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center; font-size: 12px; color: var(--text-gray); background: #fbfcfe; }
.mega-foot a { color: var(--blue); font-weight: 600; }

/* tpl 主题(绿色,跟随产品 mega) */
.mega[data-mega="tpl"] { background: #edf8f2; border-color: rgba(26,142,91,.22); box-shadow: 0 20px 48px rgba(0,91,57,.22), 0 3px 12px rgba(0,65,41,.08); }
.mega[data-mega="tpl"] .mega-left { background: #e4f4ea; }
.mega[data-mega="tpl"] .mega-left-title { color: #628173; }
.mega[data-mega="tpl"] .mega-cat { color: #365f50; }
.mega[data-mega="tpl"] .mega-cat:hover, .mega[data-mega="tpl"] .mega-cat.active { background: #f4fbf7; color: #078a55; border-left-color: #10a566; }
.mega[data-mega="tpl"] .mega-right { background: linear-gradient(135deg,#f7fcf9 0%,#edf8f2 100%); }
.mega[data-mega="tpl"] .product-pane-head h3 { color: #153f31; }
.mega[data-mega="tpl"] .product-pane-head p { color: #688477; }
.mega[data-mega="tpl"] .product-card { border-color: #cfe6d8; background: rgba(255,255,255,.7); }
.mega[data-mega="tpl"] .product-card:hover { border-color: #6fc596; box-shadow: 0 10px 24px rgba(0,118,72,.12); }
.mega[data-mega="tpl"] .product-card .ico { stroke: #07925a; }
.mega[data-mega="tpl"] .product-card strong { color: #174435; }
.mega[data-mega="tpl"] .product-card span { color: #607b70; }
.mega[data-mega="tpl"] .mega-foot { border-top-color: #cde5d6; color: #678075; background: #e5f3eb; }
.mega[data-mega="tpl"] .mega-foot a { color: #078a55; }

/* ===== Mobile Drawer ===== */
.drawer { position: fixed; top: 80px; left: 0; right: 0; bottom: 0; background: #fff; z-index: 250; overflow-y: auto; transform: translateX(100%); transition: transform .25s ease; padding: 12px 20px 40px; }
body.drawer-open .drawer { transform: translateX(0); }
.drawer a.d-link { display: flex; align-items: center; justify-content: space-between; padding: 14px 4px; border-bottom: 1px solid var(--border); font-size: 15px; color: var(--text); }
.drawer a.d-link.main { font-weight: 700; }
.drawer .d-sub { padding: 6px 0 6px 16px; }
.drawer .d-sub a { display: block; padding: 9px 4px; font-size: 13px; color: var(--text-sub); }
.drawer .d-group { border-bottom: 1px solid var(--border); }
.drawer .d-cat { padding: 8px 0 4px; font-size: 12px; color: var(--text-gray); }
.drawer-cta { display: flex; gap: 12px; margin-top: 18px; }
.drawer-cta a { flex: 1; text-align: center; padding: 12px; border-radius: 6px; font-size: 14px; font-weight: 700; }
.drawer-cta .login { background: var(--blue-light); color: var(--blue); }
.drawer-cta .reg { background: var(--blue); color: #fff; }
.drawer-backdrop { display: none; position: fixed; inset: 80px 0 0 0; background: rgba(0,0,0,.3); z-index: 240; }
body.drawer-open .drawer-backdrop { display: block; }

@media (max-width: 900px) {
    .header-nav, .header-cta { display: none; }
    .nav-toggle { display: flex; }
}