/* 品牌资料页 brand/：logo 下载、使用规范、品牌色、字体、企业信息。浅色版由 官网主题/build_theme.py 自动生成 */
:root{color-scheme:dark;--bg:#080b0d;--panel:#101416;--panel-2:#161a1d;--line:#2a2f32;--text:#f4f4f4;--muted:#9b9fa2;--accent:#4d74ff;--paper:#eef0f3;--ink:#0b0d10}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:110px}
body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC","Noto Sans CJK SC","Source Han Sans SC","Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased}
h1,h2,h3,p,figure,dl,dd{margin:0}
h1,h2,h3{font-weight:500;letter-spacing:-.03em}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;cursor:pointer;border:0;background:none}
a:focus-visible,button:focus-visible{outline:2px solid var(--text);outline-offset:4px}
img{display:block;max-width:100%;height:auto}
.ri{width:1em;height:1em;flex:none}
.skip-link{position:fixed;z-index:200;left:20px;top:12px;background:var(--text);color:var(--bg);border-radius:99px;padding:10px 20px;transform:translateY(-180%)}
.skip-link:focus{transform:translateY(0)}
.wrap{width:min(100% - 96px,1200px);margin-inline:auto}

/* 首屏 */
.bk-hero{padding:72px 0 56px;border-bottom:1px solid var(--line)}
.bk-eyebrow{font-size:12px;letter-spacing:.12em;color:var(--muted);margin-bottom:20px}
.bk-hero h1{font-size:clamp(40px,5vw,64px);line-height:1.15}
.bk-hero-desc{max-width:640px;color:var(--muted);font-size:17px;line-height:1.85;margin-top:22px}
.bk-hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}
.bk-btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:46px;padding:10px 22px;border-radius:999px;border:1px solid var(--line);background:var(--panel-2);font-size:15px;transition:background .18s,border-color .18s}
.bk-btn:hover{background:#22272a;border-color:#3a4043}
.bk-btn.is-primary{background:var(--accent);border-color:var(--accent);color:#fff}
.bk-btn.is-primary:hover{background:#3f66f0}
.bk-btn small{font-size:12px;opacity:.75}
.bk-jump{display:flex;flex-wrap:wrap;gap:8px 22px;margin-top:40px;font-size:14px;color:var(--muted)}
.bk-jump a:hover{color:var(--text)}

/* 区块 */
.bk-section{padding:88px 0;border-bottom:1px solid var(--line)}
.bk-section-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:16px 32px;margin-bottom:36px}
.bk-section-head h2{font-size:clamp(28px,3vw,40px);line-height:1.25}
.bk-section-head p{max-width:560px;color:var(--muted);font-size:15px;margin-top:10px}
.bk-num{display:block;font-size:12px;letter-spacing:.12em;color:var(--muted);margin-bottom:12px}

/* logo 卡片 */
.bk-logos{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.bk-logo{display:flex;flex-direction:column;border:1px solid var(--line);border-radius:16px;background:var(--panel);overflow:hidden}
.bk-logo-stage{position:relative;aspect-ratio:16/10;background:var(--paper);transition:background .2s}
.bk-logo-stage.is-dark{background:#14181b}
.bk-logo-stage img{position:absolute;left:14%;top:18%;width:72%;height:64%;object-fit:contain}
.bk-logo-body{display:flex;flex-direction:column;gap:14px;padding:18px 18px 20px;flex:1}
.bk-logo-title{display:flex;align-items:baseline;justify-content:space-between;gap:12px}
.bk-logo-title h3{font-size:18px}
.bk-logo-title span{font-size:12px;color:var(--muted)}
.bk-variants{display:flex;flex-wrap:wrap;gap:6px}
.bk-variant{padding:5px 12px;border-radius:999px;border:1px solid var(--line);font-size:13px;color:var(--muted);transition:color .15s,border-color .15s,background .15s}
.bk-variant:hover{color:var(--text)}
.bk-variant[aria-pressed="true"]{color:var(--text);border-color:var(--text);background:var(--panel-2)}
.bk-dl{display:flex;flex-wrap:wrap;align-items:center;gap:8px 14px;margin-top:auto;font-size:13px}
.bk-dl-png{display:inline-flex;align-items:center;gap:6px;white-space:nowrap}
.bk-dl-label{color:var(--muted);margin-right:2px}
.bk-dl a{display:inline-flex;align-items:center;gap:4px;padding:5px 10px;border-radius:8px;background:var(--panel-2);border:1px solid transparent;transition:border-color .15s}
.bk-dl a:hover{border-color:var(--accent)}
.bk-dl a.is-svg{background:var(--accent);color:#fff}
.bk-dl a.is-svg:hover{background:#3f66f0}
.bk-note{margin-top:20px;font-size:13px;color:var(--muted)}

/* 使用规范 */
.bk-rules{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.bk-rule{border:1px solid var(--line);border-radius:16px;background:var(--panel);overflow:hidden}
.bk-rule a.bk-rule-img{display:block;background:#fff}
.bk-rule img{width:100%;aspect-ratio:16/9;object-fit:cover}
.bk-rule-copy{padding:18px 20px 22px}
.bk-rule h3{font-size:18px;margin-bottom:6px}
.bk-rule p{font-size:14px;color:var(--muted);line-height:1.8}
.bk-sub{font-size:22px;margin:56px 0 20px}

/* 品牌色 */
.bk-colors{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
.bk-color{display:flex;flex-direction:column;text-align:left;border:1px solid var(--line);border-radius:16px;background:var(--panel);overflow:hidden;transition:border-color .15s}
.bk-color:hover{border-color:#4a5053}
.bk-swatch{height:120px;width:100%}
.bk-color-copy{display:flex;flex-direction:column;gap:2px;padding:14px 16px 16px;font-size:13px;color:var(--muted)}
.bk-color-copy strong{font-size:16px;font-weight:500;color:var(--text);margin-bottom:4px}
.bk-color-copy em{font-style:normal;margin-top:6px;font-size:12px}
.bk-hex{color:var(--text);font-variant-numeric:tabular-nums}

/* 字体 */
.bk-fonts{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.bk-font{display:flex;flex-direction:column;gap:8px;padding:22px;border:1px solid var(--line);border-radius:16px;background:var(--panel)}
.bk-font span{font-size:12px;color:var(--muted);letter-spacing:.06em}
.bk-font h3{font-size:20px}
.bk-font p{font-size:14px;color:var(--muted);flex:1}
.bk-font a{display:inline-flex;align-items:center;gap:6px;margin-top:6px;font-size:14px;color:var(--accent)}
.bk-font a:hover{text-decoration:underline}

/* 企业信息 */
.bk-info{border-top:1px solid var(--line)}
.bk-info>div{display:grid;grid-template-columns:160px 1fr auto;align-items:center;gap:16px;padding:16px 0;border-bottom:1px solid var(--line)}
.bk-info dt{font-size:14px;color:var(--muted)}
.bk-info dd{font-size:16px;word-break:break-word}
.bk-copy{display:inline-flex;align-items:center;gap:6px;padding:6px 12px;border-radius:8px;border:1px solid var(--line);font-size:13px;color:var(--muted);transition:color .15s,border-color .15s}
.bk-copy:hover{color:var(--text);border-color:#4a5053}
.bk-info-note{margin-top:20px;font-size:14px;color:var(--muted)}
.bk-info-note a{color:var(--text);border-bottom:1px solid #656a6c}

/* 复制提示 */
.bk-toast{position:fixed;left:50%;bottom:32px;z-index:300;transform:translate(-50%,20px);padding:10px 18px;border-radius:999px;background:var(--text);color:var(--bg);font-size:14px;opacity:0;pointer-events:none;transition:opacity .2s,transform .2s}
.bk-toast.is-on{opacity:1;transform:translate(-50%,0)}

@media(max-width:1000px){
  .bk-logos{grid-template-columns:repeat(2,minmax(0,1fr))}
  .bk-colors{grid-template-columns:repeat(2,minmax(0,1fr))}
  .bk-fonts{grid-template-columns:1fr}
  .bk-rules{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:700px){
  .wrap{width:calc(100% - 32px)}
  .bk-hero{padding:44px 0 40px}
  .bk-hero-desc{font-size:15px}
  .bk-section{padding:56px 0}
  .bk-logos,.bk-rules{grid-template-columns:1fr}
  .bk-info>div{grid-template-columns:1fr auto;gap:4px 12px}
  .bk-info dt{grid-column:1/-1}
  .bk-sub{margin-top:40px}
}
@media(max-width:380px){.bk-colors{grid-template-columns:1fr}}