/* KABU 门户网站样式
 * 基线复制自 airplay-sendspin/data/www/kabu.css（设备内嵌管理页），
 * 保持同一套设计 token（暖白/墨黑/硬阴影），再扩展门户专用布局：
 * 顶部导航、落地页 hero、能力卡、文档正文、下载中心表格。
 * 遵循 docs/KABU_WEB_STYLE_GUIDE.md 第 9 节禁止项：无网络字体/CDN/远程图/蓝紫渐变。
 */
*{box-sizing:border-box;margin:0;padding:0}
:root{
  --paper:#F4F0E8;--surface:#FFFBF3;--ink:#0A0A0A;--muted:#74716B;
  --rule:#D9D4CB;--white:#FFFFFF;--success:#2F6B4F;--warning:#9A641C;
  --error:#9E3F36;--radius-card:24px;--radius-input:14px;
  --hard-shadow:8px 10px 0 var(--ink);
  --neutral-bg:#EEE8DE;--success-bg:#E5EFE9;--error-bg:#F5E5E2;
}
html{font-family:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text","Segoe UI",system-ui,sans-serif;background:var(--paper);scroll-behavior:smooth;-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{background:var(--paper);color:var(--ink);min-height:100vh;padding:0;font-size:17px;line-height:1.5;overflow-x:hidden}
button,input,select{font:inherit;color:inherit}
a{color:var(--ink)}
.wrap{width:min(100%,960px);margin:0 auto;padding:0 20px}
.narrow{width:min(100%,720px);margin:0 auto;padding:0 20px}

/* ---- 顶部导航 ---- */
.site-nav{position:sticky;top:0;z-index:30;background:var(--paper);border-bottom:2px solid var(--ink)}
.site-nav .inner{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:12px 20px;max-width:1100px;margin:0 auto;flex-wrap:wrap}
.site-nav .logo{font-weight:850;font-size:24px;letter-spacing:-.05em;text-transform:lowercase;text-decoration:none;flex:0 0 auto}
.site-nav .links{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.site-nav .links a{text-decoration:none;font-weight:700;font-size:15px;padding:8px 14px;border:2px solid transparent;border-radius:999px;white-space:nowrap}
.site-nav .links a:hover{border-color:var(--ink)}
.site-nav .links a.cta{background:var(--ink);color:var(--surface)}
.site-nav .right{display:flex;align-items:center;gap:10px;margin-left:auto}
/* 语言切换 */
.lang-switch{display:inline-flex;border:2px solid var(--ink);border-radius:999px;overflow:hidden;flex:0 0 auto}
.lang-switch button{border:0;background:var(--surface);color:var(--ink);font-weight:700;font-size:13px;padding:6px 12px;min-height:34px;cursor:pointer}
.lang-switch button.active{background:var(--ink);color:var(--surface)}

/* ---- 品牌页头 ---- */
.brand-mark,.page-name{font-weight:850;font-size:clamp(48px,10vw,72px);line-height:.84;letter-spacing:-.055em}
.brand-mark{text-transform:lowercase}
.portal-kicker{margin-top:18px;color:var(--muted);font-size:15px;letter-spacing:.18em;text-transform:uppercase;font-weight:550}

/* ---- Hero ---- */
.hero{padding:56px 0 40px}
.hero .tagline{margin-top:22px;font-size:20px;max-width:640px;color:var(--ink)}
.hero .sub{margin-top:14px;color:var(--muted);font-size:16px;max-width:620px}
.hero .cta-row{display:flex;gap:14px;flex-wrap:wrap;margin-top:30px}

/* ---- 按钮 ---- */
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:10px 22px;border:2px solid var(--ink);border-radius:999px;font-size:17px;font-weight:650;background:var(--surface);color:var(--ink);text-decoration:none;transition:transform .12s,opacity .12s,background .12s}
.btn:active{transform:translate(1px,1px);opacity:.72}
.btn-primary{background:var(--ink);color:var(--surface)}
.btn-secondary{background:transparent;color:var(--ink)}

/* ---- 卡片 ---- */
.card{background:var(--surface);border:2px solid var(--ink);border-radius:var(--radius-card);overflow:hidden;box-shadow:var(--hard-shadow)}
.card-header{color:var(--muted);font-size:13px;font-weight:650;letter-spacing:.12em;text-transform:uppercase;padding:18px 20px 4px}
.card-body{padding:8px 20px 20px}

/* ---- 能力网格 ---- */
.section-title{margin:48px 0 20px;font-weight:850;font-size:clamp(28px,5vw,40px);letter-spacing:-.04em}
.feature-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin-bottom:12px}
.feature{padding:24px}
.feature h3{font-size:20px;font-weight:800;letter-spacing:-.02em}
.feature p{margin-top:10px;color:var(--muted);font-size:15px;line-height:1.5}
.feature .ico{display:inline-block;font-size:13px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--success);margin-bottom:12px}

/* ---- 图片卡 ---- */
.gallery{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.gallery figure{border:2px solid var(--ink);border-radius:var(--radius-card);overflow:hidden;background:var(--surface);box-shadow:var(--hard-shadow)}
.gallery img{display:block;width:100%;height:auto}
.gallery figcaption{padding:14px 18px;font-size:14px;color:var(--muted)}

/* ---- 文档正文 ---- */
.doc{padding:40px 0 72px}
.doc h1{font-weight:850;font-size:clamp(34px,7vw,52px);line-height:.9;letter-spacing:-.05em;margin-bottom:8px}
.doc .doc-kicker{color:var(--muted);font-size:14px;letter-spacing:.16em;text-transform:uppercase;margin-bottom:28px}
.doc-body{font-size:17px;line-height:1.65;max-width:720px}
.doc-body h2{margin:34px 0 12px;font-weight:800;font-size:26px;letter-spacing:-.02em}
.doc-body h3{margin:26px 0 10px;font-weight:750;font-size:20px}
.doc-body p{margin:0 0 16px}
.doc-body ul,.doc-body ol{margin:0 0 16px;padding-left:24px}
.doc-body li{margin:6px 0}
.doc-body a{color:var(--ink);text-decoration:underline}
.doc-body code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:var(--neutral-bg);padding:2px 6px;border-radius:6px;font-size:15px}
.doc-body pre{background:var(--ink);color:var(--surface);padding:16px 18px;border-radius:14px;overflow-x:auto;margin:0 0 18px}
.doc-body pre code{background:transparent;color:inherit;padding:0;font-size:14px}
.doc-body blockquote{border-left:4px solid var(--ink);padding:4px 0 4px 16px;color:var(--muted);margin:0 0 16px}
.doc-body table{border-collapse:collapse;width:100%;margin:0 0 18px;font-size:15px}
.doc-body th,.doc-body td{border:1px solid var(--rule);padding:9px 12px;text-align:left}
.doc-body th{background:var(--neutral-bg);font-weight:700}
.doc-nav{display:flex;flex-wrap:wrap;gap:10px;margin:8px 0 24px}
.doc-nav a{text-decoration:none;font-weight:700;font-size:14px;padding:8px 14px;border:2px solid var(--ink);border-radius:999px;background:var(--surface)}

/* ---- 下载中心 ---- */
.dl-banner{border:2px solid var(--ink);border-radius:var(--radius-card);padding:22px 24px;background:var(--surface);box-shadow:var(--hard-shadow);margin-bottom:28px}
.dl-banner .ver{font-weight:850;font-size:clamp(30px,6vw,44px);letter-spacing:-.04em}
.dl-warn{margin-top:16px;background:var(--error-bg);color:var(--error);border:1px solid currentColor;border-radius:12px;padding:12px 14px;font-size:14px;font-weight:600}
.dl-meta{display:grid;grid-template-columns:1fr 1fr;gap:0;margin:6px 0 0}
.dl-meta .cell{padding:12px 0;border-bottom:1px solid var(--rule)}
.dl-meta .cell label{display:block;font-size:12px;color:var(--muted);letter-spacing:.08em;text-transform:uppercase;margin-bottom:4px}
.dl-meta .cell span{font-size:15px;font-weight:700;word-break:break-all}
.dl-meta .cell .mono{font-family:ui-monospace,SFMono-Regular,Menlo,monospace}
.dl-actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:20px}
.dl-list{margin-top:36px}
.dl-list table{width:100%;border-collapse:collapse;font-size:15px}
.dl-list th,.dl-list td{border:1px solid var(--rule);padding:11px 14px;text-align:left}
.dl-list th{background:var(--neutral-bg);font-weight:700;text-transform:uppercase;font-size:12px;letter-spacing:.1em;color:var(--muted)}
.dl-list td.mono{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px;word-break:break-all}
.dl-list a.dl-btn{text-decoration:none;font-weight:700;font-size:13px;padding:6px 12px;border:2px solid var(--ink);border-radius:999px;white-space:nowrap}

/* ---- 页脚 ---- */
.site-footer{border-top:2px solid var(--ink);margin-top:60px;padding:32px 0 48px}
.site-footer .inner{display:flex;flex-wrap:wrap;gap:16px;justify-content:space-between;align-items:center;color:var(--muted);font-size:14px}
.site-footer .logo{font-weight:850;color:var(--ink);letter-spacing:-.04em;text-transform:lowercase}

/* ---- 语言提示条（仅英文时显示，用于提示未翻译的文档页）---- */
.lang-notice{display:none;background:var(--neutral-bg);border:2px solid var(--ink);border-radius:14px;padding:12px 16px;margin:0 0 24px;font-size:14px;font-weight:600}
html[data-lang="en"] .lang-notice{display:block}

/* ---- 响应式：平板 ---- */
@media(max-width:820px){
  .wrap,.narrow{padding:0 16px}
}
@media(max-width:720px){
  .feature-grid,.gallery,.dl-meta{grid-template-columns:1fr}
  .hero{padding:36px 0 24px}
  .section-title{margin:36px 0 16px}
}
/* ---- 响应式：手机 ---- */
@media(max-width:640px){
  .site-nav .inner{padding:10px 14px;gap:10px}
  .site-nav .logo{font-size:22px}
  .site-nav .links{order:3;width:100%;flex-wrap:nowrap;overflow-x:auto;-webkit-overflow-scrolling:touch;padding-bottom:4px;scrollbar-width:none}
  .site-nav .links::-webkit-scrollbar{display:none}
  .site-nav .links a{font-size:14px;padding:6px 12px}
  .lang-switch button{padding:5px 10px;min-height:30px}
  .wrap,.narrow{padding:0 14px}
  body{font-size:16px}
  .hero .tagline{font-size:18px}
  .hero .cta-row{gap:10px}
  .hero .cta-row .btn{flex:1 1 100%;justify-content:center}
  .card{margin-right:6px;margin-bottom:26px;box-shadow:7px 8px 0 var(--ink)}
  .feature{padding:20px}
  .doc{padding:28px 0 56px}
  .doc h1{font-size:clamp(30px,9vw,40px)}
  .doc-body{font-size:16px}
  /* 表格横向滚动，避免小屏溢出 */
  .doc-body table,.dl-list table{display:block;overflow-x:auto;white-space:nowrap}
  .dl-list th,.dl-list td,.doc-body th,.doc-body td{white-space:nowrap}
  .dl-banner{padding:18px}
  .dl-actions .btn{flex:1 1 100%;justify-content:center}
}
@media(max-width:400px){
  .brand-mark,.page-name{font-size:clamp(40px,13vw,56px)}
  .site-nav .links a{font-size:13px;padding:5px 10px}
}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}