/* Read-only materials viewer — dark shell, light page area */
.viewer-body{margin:0;min-height:100vh;background:#0a1a33;color:#e8eef8;font-family:system-ui,-apple-system,"PingFang SC","Noto Sans SC",sans-serif;-webkit-user-select:none;user-select:none}
.viewer-bar{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:14px;padding:10px 16px;background:rgba(10,26,51,.96);border-bottom:1px solid rgba(255,255,255,.08);backdrop-filter:blur(8px)}
.viewer-back{color:#9db4d4;text-decoration:none;font-size:14px;white-space:nowrap;flex-shrink:0}
.viewer-back:hover{color:#fff}
.viewer-meta{flex:1;min-width:0}
.viewer-ed{margin:0;font-size:11px;letter-spacing:.08em;color:#7a93b3;text-transform:uppercase}
.viewer-title{margin:2px 0 0;font-size:15px;font-weight:600;color:#f2f6fc;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.viewer-badge{margin:0;flex-shrink:0;font-size:11px;line-height:1.3;color:#0a1a33;background:#c9a227;padding:6px 10px;border-radius:4px;max-width:11em;text-align:center}
.viewer-tools{position:sticky;top:52px;z-index:19;display:flex;align-items:center;justify-content:center;gap:8px;padding:8px;background:rgba(10,26,51,.92);border-bottom:1px solid rgba(255,255,255,.06)}
.viewer-tools[hidden]{display:none!important}
.viewer-tools button{width:36px;height:36px;border:1px solid rgba(255,255,255,.18);background:rgba(255,255,255,.06);color:#e8eef8;border-radius:6px;font-size:18px;cursor:pointer;line-height:1}
.viewer-tools button:hover{background:rgba(255,255,255,.14)}
.viewer-tools button:disabled{opacity:.35;cursor:default}
#vpage{min-width:5.5em;text-align:center;font-size:13px;color:#b8c8dc;font-variant-numeric:tabular-nums}
.viewer-main{padding:16px 12px 48px;max-width:920px;margin:0 auto}
.viewer-status{text-align:center;color:#9db4d4;padding:48px 16px;font-size:15px}
.viewer-status.err{color:#f0a0a0}
.viewer-pages{display:flex;flex-direction:column;align-items:center;gap:16px;width:100%}
.viewer-page{position:relative;width:100%;max-width:100%;background:#fff;box-shadow:0 8px 28px rgba(0,0,0,.35);border-radius:2px;overflow:hidden;line-height:0}
.viewer-page canvas{display:block;width:100%!important;height:auto!important;max-width:100%;vertical-align:top}
.viewer-wm{pointer-events:none;position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:clamp(14px,2.8vw,22px);font-weight:500;color:rgba(10,26,51,.07);letter-spacing:.12em;transform:rotate(-28deg);white-space:nowrap;user-select:none}
.viewer-foot{padding:20px 16px 40px;text-align:center;font-size:12px;color:#7a93b3;border-top:1px solid rgba(255,255,255,.06)}
.viewer-foot p{margin:0;max-width:36em;margin-inline:auto;line-height:1.55}
@media (max-width:820px){
  .viewer-body{padding-bottom:calc(72px + env(safe-area-inset-bottom,0px))}
  .viewer-main{padding:12px 10px 88px}
  .viewer-bar{flex-wrap:wrap;gap:8px;padding:10px 12px}
  .viewer-badge{max-width:none;width:100%;order:3}
  .viewer-tools{top:auto;position:sticky}
  .viewer-foot{padding-bottom:calc(24px + env(safe-area-inset-bottom,0px))}
}
@media print{
  body *{display:none!important;visibility:hidden!important}
  body::after{content:"本资料仅供在线阅读，不提供打印。";display:block!important;visibility:visible!important;padding:40px;font-size:18px;color:#000}
}