/* 全站悬浮菜单：左上角固定按钮 + 覆盖式侧滑抽屉。 */
.drawer-burger{position:fixed;top:14px;left:14px;z-index:9600;display:inline-flex;align-items:center;gap:8px;padding:9px 16px 9px 12px;border:1px solid #ffffff1c;border-radius:999px;background:#151922d9;backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);color:#c6cdd9;font-size:14px;font-weight:550;letter-spacing:.5px;box-shadow:inset 0 1px 0 #ffffff10,0 8px 22px #0000004d;cursor:pointer;transition:color .25s,border-color .25s,background .25s,box-shadow .3s,transform .2s var(--ease,cubic-bezier(.22,1,.36,1))}
.drawer-burger svg{width:18px;height:18px;flex-shrink:0}
.drawer-burger:hover{color:#fff;border-color:#ff465566;background:#1a1f2be6;box-shadow:inset 0 1px 0 #ffffff1a,0 10px 26px #00000059,0 0 18px #ff465514}
.drawer-burger:active{transform:scale(.96)}
.drawer-burger[aria-expanded=true]{color:#ff8790;border-color:#ff465555}
/* 给固定按钮让位：窄屏时各页头部左侧留白 */
.viewer-nav,.treasure-bar{padding-left:86px}
@media(max-width:1200px){.home-header{padding-left:86px}}
@media(max-width:640px){.home-header,.viewer-nav,.treasure-bar{padding-left:62px}.drawer-burger{padding:9px 12px}.drawer-burger span{display:none}}

.drawer-backdrop{position:fixed;inset:0;z-index:9400;border:0;width:100%;height:100%;padding:0;background:#070a1199;backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);opacity:0;transition:opacity .28s ease}
.drawer-backdrop.is-open{opacity:1}

.site-drawer{position:fixed;top:0;left:0;bottom:0;z-index:9500;width:min(308px,86vw);display:flex;flex-direction:column;padding:22px 14px 18px;border-right:1px solid #ffffff14;background:#101319f7;backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);box-shadow:26px 0 70px #00000073, inset 1px 0 0 #ffffff0a;transform:translateX(-102%);visibility:hidden;transition:transform .34s cubic-bezier(.22,1,.36,1),visibility 0s .34s;overflow-y:auto;overscroll-behavior:contain}
.site-drawer.is-open{transform:translateX(0);visibility:visible;transition:transform .34s cubic-bezier(.22,1,.36,1),visibility 0s 0s}
.drawer-head{display:flex;align-items:center;justify-content:space-between;padding:2px 10px 16px}
.drawer-eyebrow{font-size:10px;letter-spacing:.42em;color:#6d7686}
.drawer-head .icon-close{width:30px;height:30px;font-size:20px;line-height:26px}
.drawer-item{display:flex;align-items:center;gap:14px;width:100%;text-align:left;padding:12px 12px;margin-bottom:3px;border:1px solid transparent;border-radius:13px;background:transparent;color:#dce0e8;text-decoration:none;font:inherit;cursor:pointer;transition:background .22s,border-color .22s,translate .3s cubic-bezier(.22,1,.36,1)}
.drawer-item:hover{background:#ffffff07;border-color:#ffffff10;translate:3px 0}
.drawer-item[aria-current=page]{background:#ff465512;border-color:#ff46553d}
.drawer-item[aria-current=page] .drawer-idx{color:#ff8790}
.drawer-item:focus-visible{outline:2px solid #ff929c;outline-offset:2px}
.drawer-idx{font-size:11px;color:#5f6877;font-variant-numeric:tabular-nums;min-width:20px}
.drawer-txt strong{display:block;font-size:15.5px;font-weight:550;letter-spacing:.3px}
.drawer-txt small{display:block;font-size:11.5px;color:#7d8695;margin-top:2px}
.drawer-foot{margin-top:auto;padding:14px 12px 2px;font-size:10.5px;letter-spacing:.14em;color:#4d5563}
@media(prefers-reduced-motion:reduce){.site-drawer,.drawer-backdrop,.drawer-item,.drawer-burger{transition:none}}