/* ── 抽屉把手：桌面隐藏 ── */
.drawer-handle{display:none}

/* ── 电脑端右下角「手机扫码」卡片（16:9 位于看板下方空位；4:3 收进顶栏胶囊，点开为下拉卡片） ── */
.qr{display:contents}
.qr .qr-pill{display:none}
.qr .qr-card{position:fixed;right:var(--gap);bottom:calc(var(--gap)*.8);width:var(--panel-w);height:var(--bar-h);box-sizing:border-box;display:flex;align-items:center;gap:14px;padding:10px 40px 10px 12px;border-radius:22px;text-shadow:0 1px 2px rgba(4,26,70,.35);z-index:5}
.qr .qr-box{flex:none;width:calc(var(--bar-h) - 20px);height:calc(var(--bar-h) - 20px);display:grid;place-items:center;padding:0;border-radius:12px;border:2px dashed rgba(255,255,255,.7);background:rgba(255,255,255,.08);color:#fff;cursor:zoom-in}
.qr.ready .qr-box{border:0;background:#fff;padding:4px}
.qr .qr-box svg,.qr .qr-big-box svg{width:100%;height:100%;display:block;border-radius:6px;stroke:none;fill:#06224d} /* 顶栏图标规则带白描边，这里关掉，否则二维码被描边糊成白块 */
.qr .qr-ph{font-size:11px;line-height:1.3;text-align:center;color:#f3f8ff}
.qr .qr-text{display:flex;flex-direction:column;gap:3px;min-width:0}
.qr .qr-text b{font-size:1em;color:#fff}.qr-text small{font-size:.82em;color:var(--muted)}
.qr .qr-min{position:absolute;right:8px;top:8px;width:28px;height:28px;padding:0;border-radius:50%;border:1px solid rgba(255,255,255,.35);background:rgba(255,255,255,.12);color:#fff;font-size:18px;line-height:1;display:grid;place-items:center;cursor:pointer}
.qr[data-state=pill] .qr-card{display:none}
.qr[data-state=pill] .qr-pill{display:flex;position:fixed;right:var(--gap);bottom:calc(var(--gap)*.8);min-height:46px;padding:0 1em;border-radius:999px;gap:.45em;align-items:center;color:#fff;z-index:5}
.qr .qr-pill svg{width:1.15em;height:1.15em;fill:currentColor;stroke:none}
.qr .qr-big{position:fixed;inset:0;z-index:60;display:grid;place-items:center;background:rgba(2,14,40,.45);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px)}
.qr .qr-big[hidden]{display:none}
.qr .qr-big-card{position:relative;display:flex;flex-direction:column;align-items:center;gap:12px;padding:28px 30px 22px;border-radius:26px;color:#fff;background:var(--g-bg),var(--g-noise),rgba(18,52,110,.5);border:1px solid var(--g-edge);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);box-shadow:var(--g-hi),var(--g-shadow);text-shadow:0 1px 2px rgba(4,26,70,.35)}
.qr .qr-big-box{width:min(52vh,340px);height:min(52vh,340px);display:grid;place-items:center;border-radius:16px;border:3px dashed rgba(255,255,255,.7);background:rgba(255,255,255,.08)}
.qr.ready .qr-big-box{border:0;background:#fff;padding:12px}
.qr .qr-big-box .qr-ph{font-size:20px}
.qr .qr-big-card b{font-size:1.15em}.qr-url{max-width:min(70vw,420px);font-size:.8em;color:var(--muted);word-break:break-all;text-align:center}
.qr .qr-big-close{position:absolute;right:12px;top:12px;width:36px;height:36px;padding:0;border-radius:50%;border:1px solid rgba(255,255,255,.4);background:rgba(255,255,255,.14);color:#fff;font-size:22px;display:grid;place-items:center}
/* 4:3：底栏占满宽，右下无空位 → 胶囊进顶栏，卡片作下拉弹层 */
@media (max-aspect-ratio:3/2){
 .qr .qr-pill,.qr[data-state=pill] .qr-pill{display:flex;position:static;min-height:46px;border-radius:12px;padding:0 1em}
 .qr[data-state=card] .qr-pill{background:linear-gradient(180deg,rgba(120,205,255,.55),rgba(40,140,240,.42));border-color:rgba(210,240,255,.95)}
 .qr .qr-card{position:absolute;top:calc(100% + 10px);right:0;bottom:auto;width:300px;height:96px}
 .qr .qr-box{width:76px;height:76px}
}
/* 触屏、小屏：不显示 */
@media (pointer:coarse),(max-width:1099px),(max-height:620px){.qr{display:none!important}}

/* ── 手机竖屏：3D 在上，看板为底部可上拉抽屉 ── */
@media (orientation:portrait) and (max-width:1024px){
 :root{--gap:12px;--fs:clamp(14px,3.7vw,17px);--sa-t:env(safe-area-inset-top,0px);--sa-b:env(safe-area-inset-bottom,0px);--sa-l:env(safe-area-inset-left,0px);--sa-r:env(safe-area-inset-right,0px)}
 header{left:calc(14px + var(--sa-l));top:calc(10px + var(--sa-t));max-width:calc(100vw - 196px - var(--sa-l) - var(--sa-r))}
 .eyebrow,.subtitle,.hint{display:none}
 h1{font-size:clamp(18px,4.9vw,28px);line-height:1.25}
 .top-tools{right:calc(10px + var(--sa-r));top:calc(8px + var(--sa-t));gap:6px}
 .top-tools>button,.top-tools .bg-tools>button,.top-tools .pd-tools>button{min-height:44px;height:44px;border-radius:14px}
 #knowledge,#pd-toggle{width:52px;padding:0!important;justify-content:center;font-size:0!important;gap:0!important}
 #knowledge svg,#pd-toggle svg{width:22px!important;height:22px!important}
 .top-tools #bg-color{width:44px}
 .top-tools .bg-switch,#fullscreen{display:none!important}
 .bg-pop,.pd-pop{position:fixed!important;left:10px!important;right:10px!important;top:calc(62px + var(--sa-t))!important;width:auto!important;max-height:calc(100vh - 140px);overflow:auto}
 .tabs{top:var(--tabs-top,80px)!important;bottom:auto!important;left:0!important;right:0!important;display:flex!important;flex-direction:row!important;align-items:center!important;align-content:normal!important;flex-wrap:nowrap;overflow-x:auto;overscroll-behavior-x:contain;padding:4px calc(12px + var(--sa-r)) 6px calc(12px + var(--sa-l));gap:8px;min-height:0!important;scrollbar-width:none;scroll-snap-type:x proximity;pointer-events:auto!important;-webkit-overflow-scrolling:touch}
 .tabs::-webkit-scrollbar{display:none}
 .tabs button{flex:none;min-height:44px!important;font-size:.9em;padding:.2em .95em .2em .45em;scroll-snap-align:center;white-space:nowrap}
 #controls{left:calc(8px + var(--sa-l))!important;right:calc(8px + var(--sa-r))!important;bottom:calc(8px + var(--sa-b));min-height:0;padding:8px 10px;gap:6px 6px;flex-wrap:wrap;justify-content:center;border-radius:20px}
 #controls .sep,#controls [id$=-flow],#an-spin{display:none}
 #controls .grow{order:-1;flex:1 1 100%;min-width:0}
 #controls label{font-size:.92em}
 #controls button{min-height:44px;padding:0 .75em;font-size:.92em;border-radius:12px}
 #controls button.primary{min-width:4.6em}
 #panel{left:calc(8px + var(--sa-l));right:calc(8px + var(--sa-r));top:auto;width:auto;display:flex;flex-direction:column;overflow:hidden;padding:0;border-radius:22px;transition:height .28s cubic-bezier(.2,.8,.2,1);font-size:.95em}
 #panel.dragging{transition:none}
 #panel>:not(.drawer-handle){flex:1;min-height:0;overflow:auto;overscroll-behavior:contain;padding:2px 16px 16px}
 #panel.collapsed>:not(.drawer-handle){visibility:hidden}
 .drawer-handle{display:flex;flex:none;flex-direction:column;align-items:center;gap:5px;width:100%;min-height:48px;padding:8px 0 6px;border:0;background:transparent;color:var(--muted);font-size:13px;touch-action:none;cursor:grab;text-shadow:0 1px 2px rgba(4,26,70,.35)}
 .drawer-handle i{width:44px;height:5px;border-radius:5px;background:rgba(255,255,255,.75);box-shadow:0 1px 2px rgba(0,20,60,.25)}
}
/* 平板竖屏（820×1180 等）：看板稍宽松 */
@media (orientation:portrait) and (min-width:700px) and (max-width:1024px){
 h1{font-size:28px}
 #controls{left:calc(16px + var(--sa-l))!important;right:calc(16px + var(--sa-r))!important;bottom:calc(14px + var(--sa-b));flex-wrap:nowrap}
 #controls .grow{order:0;flex:1 1 auto;min-width:200px}
 #controls [id$=-flow]{display:flex}
 #panel{left:calc(16px + var(--sa-l));right:calc(16px + var(--sa-r))}
}

/* ── 手机横屏：看板在右（可收成胶囊），控制条在左下 ── */
@media (orientation:landscape) and (max-height:520px){
 :root{--gap:10px;--fs:14px;--mp-w:min(40vw,330px);--sa-t:env(safe-area-inset-top,0px);--sa-b:env(safe-area-inset-bottom,0px);--sa-l:env(safe-area-inset-left,0px);--sa-r:env(safe-area-inset-right,0px)}
 header{left:calc(12px + var(--sa-l));top:calc(6px + var(--sa-t));max-width:calc(100vw - var(--mp-w) - 40px - var(--sa-l) - var(--sa-r))}
 .eyebrow,.subtitle,.hint{display:none}
 h1{font-size:18px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
 .top-tools{right:calc(10px + var(--sa-r));top:calc(6px + var(--sa-t));gap:6px}
 .top-tools>button,.top-tools .bg-tools>button,.top-tools .pd-tools>button{min-height:44px;height:44px;border-radius:14px}
 #knowledge,#pd-toggle{width:52px;padding:0!important;justify-content:center;font-size:0!important;gap:0!important}
 #knowledge svg,#pd-toggle svg{width:22px!important;height:22px!important}
 .top-tools #bg-color{width:44px}
 .top-tools .bg-switch,#fullscreen{display:none!important}
 .bg-pop,.pd-pop{position:fixed!important;right:10px!important;top:58px!important;bottom:8px;left:auto!important;width:min(380px,60vw)!important;overflow:auto}
 .tabs{top:var(--tabs-top,40px)!important;bottom:auto!important;left:0!important;right:calc(var(--mp-w) + 16px + var(--sa-r))!important;display:flex!important;flex-direction:row!important;align-items:center!important;flex-wrap:nowrap;overflow-x:auto;padding:2px 8px 4px calc(10px + var(--sa-l));gap:6px;min-height:0!important;scrollbar-width:none;pointer-events:auto!important}
 .tabs::-webkit-scrollbar{display:none}
 .tabs button{flex:none;min-height:44px!important;font-size:.88em;padding:.1em .8em .1em .4em;white-space:nowrap}
 #controls{left:calc(8px + var(--sa-l))!important;right:calc(var(--mp-w) + 16px + var(--sa-r))!important;bottom:calc(6px + var(--sa-b));min-height:0;padding:5px 8px;gap:6px;flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none;border-radius:18px}
 #controls::-webkit-scrollbar{display:none}
 #controls .sep,#controls [id$=-flow],#an-spin{display:none}
 #controls .grow{flex:1 0 150px;min-width:150px}
 #controls label{font-size:.9em}
 #controls button{min-height:44px;padding:0 .7em;font-size:.9em;flex:none}
 #panel{top:calc(58px + var(--sa-t));right:calc(8px + var(--sa-r));bottom:calc(6px + var(--sa-b));left:auto;width:var(--mp-w);display:flex;flex-direction:column;overflow:hidden;padding:0;border-radius:20px;font-size:.92em}
 #panel>:not(.drawer-handle){flex:1;min-height:0;overflow:auto;padding:0 14px 14px}
 .drawer-handle{display:flex;flex:none;align-self:flex-end;align-items:center;gap:6px;min-height:44px;padding:0 14px;border:0;background:transparent;color:var(--muted);font-size:13px}
 .drawer-handle i{width:8px;height:8px;border-right:2px solid currentColor;border-bottom:2px solid currentColor;transform:rotate(-45deg)}
 #panel.collapsed{top:auto;height:56px;width:auto;border-radius:999px}
 #panel.collapsed>:not(.drawer-handle){display:none}
 #panel.collapsed .drawer-handle{align-self:center;min-height:54px;color:#fff}
 #panel.collapsed .drawer-handle i{transform:rotate(135deg)}
 #course:has(#panel.collapsed) #controls{right:calc(120px + var(--sa-r))!important}
 #course:has(#panel.collapsed) .tabs{right:0!important}
 #course:has(#panel.collapsed) header{max-width:calc(100vw - 200px)}
}