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18vw, 6rem);--tablet-chrome-bottom-clearance: clamp(5.5rem, 24vw, 7.25rem);--mobile-shell-bg: #edf3fb;--mobile-surface: rgba(255, 255, 255, .9);--mobile-surface-strong: #ffffff;--mobile-surface-soft: #f8fbff;--mobile-surface-muted: #eef5ff;--mobile-border: rgba(148, 163, 184, .24);--mobile-border-strong: rgba(148, 163, 184, .38);--mobile-text: #0f172a;--mobile-muted: #64748b;--mobile-shadow: 0 18px 40px rgba(15, 23, 42, .14);--mobile-shadow-soft: 0 12px 28px rgba(15, 23, 42, .1);--mobile-accent-bg: rgba(74, 144, 217, .12);--mobile-accent-border: rgba(74, 144, 217, .42);--mobile-accent-text: #1d4f91;--mobile-danger: #e11d48;--mobile-handle: rgba(148, 163, 184, .52);background:radial-gradient(circle at top,rgba(125,168,230,.24),transparent 34%),linear-gradient(180deg,#f7fbff,#edf3fb 40%,#e7eef8)}.mobile-shell .toast-container{top:calc(var(--mobile-top-gap) + var(--safe-top) + var(--shell-banner-height));right:calc(var(--mobile-gutter) + var(--safe-right));left:calc(var(--mobile-gutter) + 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.mobile-room-status-dot{background:#22c55e}.mobile-room-status.syncing .mobile-room-status-dot{background:#60a5fa}.mobile-room-status.connecting .mobile-room-status-dot{background:#cbd5e1}.mobile-room-status.reconnecting .mobile-room-status-dot,.mobile-room-status.disconnected .mobile-room-status-dot,.mobile-room-status.warning .mobile-room-status-dot{background:#f59e0b}.mobile-room-status.danger .mobile-room-status-dot{background:#fb7185}.mobile-selection-bar{position:fixed;left:50%;transform:translate(-50%);bottom:calc(var(--mobile-selection-bottom-offset) + var(--safe-bottom));display:flex;align-items:center;gap:clamp(.3rem,1.4vw,.55rem);padding:calc(var(--mobile-selection-padding-y) + .1rem) calc(var(--mobile-selection-padding-x) + .1rem);border-radius:clamp(1.05rem,4.4vw,1.45rem);background:#fffffff5;border:1px solid var(--mobile-border);box-shadow:var(--mobile-shadow),inset 0 1px #ffffff94;z-index:2105;max-width:calc(100vw - 1.1rem - var(--safe-left) - var(--safe-right))}.mobile-selection-group{display:flex;align-items:center;gap:clamp(.3rem,1vw,.42rem)}.mobile-selection-group--clipboard{padding:0;border-radius:0;background:transparent}.mobile-selection-divider{width:1px;align-self:stretch;margin:0 .05rem;background:linear-gradient(180deg,#e2e8f000,#cbd5e1f2,#e2e8f000)}.mobile-selection-btn{width:clamp(2.2rem,9vw,2.85rem);height:clamp(2.2rem,9vw,2.85rem);border:none;border-radius:calc(var(--mobile-control-radius) * .95);background:var(--mobile-surface-soft);color:var(--mobile-text);display:grid;place-items:center;box-shadow:inset 0 1px #ffffff9e}.mobile-selection-btn--accent{background:#fffffff0;color:#2563eb}.mobile-selection-btn--danger{color:var(--mobile-danger)}.mobile-selection-btn:disabled{opacity:.42}.mobile-toolbar{position:fixed;left:50%;bottom:calc(var(--mobile-gutter) + var(--safe-bottom));transform:translate(-50%);width:var(--mobile-toolbar-width);height:var(--mobile-toolbar-height);border-radius:var(--mobile-control-radius);background:#fffffff5;border:1px solid var(--mobile-border);box-shadow:var(--mobile-shadow),inset 0 1px #ffffff80;display:grid;grid-template-columns:repeat(4,var(--mobile-control-size));align-items:center;justify-content:center;gap:var(--mobile-toolbar-gap);padding:var(--mobile-toolbar-inset);z-index:2100}.mobile-toolbar-btn{width:var(--mobile-control-size);height:var(--mobile-control-size);border:none;background:transparent;color:var(--mobile-text);border-radius:var(--mobile-control-radius);display:grid;place-items:center;flex:0 0 var(--mobile-control-size);padding:0}.mobile-toolbar-btn.is-active{background:var(--mobile-accent-bg)}.mobile-toolbar-btn.is-pen{color:#79a7ff}.mobile-toolbar-btn.is-eraser{color:#8b5cf6}.mobile-toolbar-btn.is-highlighter{color:#d8c55a}.mobile-toolbar-btn.is-text{color:#fda4af}.mobile-toolbar-btn.is-select{color:var(--mobile-accent-text)}.mobile-sheet-overlay{position:fixed;top:0;right:0;bottom:0;left:0;border:none;background:#0f172a29;z-index:2140}.mobile-bottom-sheet{position:fixed;left:0;right:0;bottom:0;z-index:2150}.mobile-sheet-card{background:var(--mobile-surface-strong);border-top:1px solid var(--mobile-border);border-radius:var(--mobile-sheet-radius) var(--mobile-sheet-radius) 0 0;box-shadow:0 -18px 40px #0f172a24;padding:var(--mobile-sheet-padding-y) calc(var(--mobile-sheet-padding-x) + var(--safe-right)) calc(var(--mobile-sheet-padding-x) + var(--safe-bottom)) calc(var(--mobile-sheet-padding-x) + var(--safe-left))}.mobile-sheet-handle{width:var(--mobile-sheet-handle-width);height:var(--mobile-sheet-handle-height);border-radius:999px;background:var(--mobile-handle);margin:0 auto clamp(.75rem,3vw,1rem)}.mobile-sheet-header{display:flex;align-items:center;justify-content:space-between;gap:var(--mobile-floating-gap);margin-bottom:clamp(.5rem,2vw,.75rem)}.mobile-sheet-title{font-size:var(--mobile-title-sm);font-weight:800;letter-spacing:-.03em;color:var(--mobile-text)}.mobile-sheet-close{border:none;background:var(--mobile-surface-soft);color:var(--mobile-text);border-radius:calc(var(--mobile-control-radius) * .85);padding:clamp(.42rem,1.8vw,.58rem) clamp(.58rem,2.5vw,.78rem);font-size:var(--mobile-label-sm)}.mobile-tool-list{display:grid;gap:clamp(.625rem,2.6vw,.9rem)}.mobile-tool-list-item{border:none;background:transparent;border-radius:calc(var(--mobile-control-radius) * .95);padding:0;display:flex;align-items:center;gap:clamp(.75rem,3vw,1rem);color:var(--mobile-text);text-align:left}.mobile-tool-list-item.active .mobile-tool-list-icon{background:var(--mobile-accent-bg);color:var(--mobile-accent-text)}.mobile-tool-list-icon{width:var(--mobile-tool-icon-box);height:var(--mobile-tool-icon-box);border-radius:calc(var(--mobile-control-radius) * .85);display:grid;place-items:center;flex-shrink:0;background:var(--mobile-surface-soft)}.mobile-tool-list-icon svg{width:clamp(1.2rem,5vw,1.6rem);height:clamp(1.2rem,5vw,1.6rem)}.mobile-tool-list-icon .mobile-drag-icon svg{width:clamp(.98rem,4.1vw,1.28rem);height:clamp(.98rem,4.1vw,1.28rem)}.mobile-tool-list-copy strong{display:block;font-size:var(--mobile-title-sm);font-weight:800;letter-spacing:-.03em}.mobile-shell .touch-settings-backdrop{z-index:2160;background:#0f172a29;padding:calc(var(--mobile-gutter) + var(--safe-top)) calc(var(--mobile-gutter) + var(--safe-right)) calc(var(--mobile-gutter) + var(--safe-bottom)) calc(var(--mobile-gutter) + var(--safe-left))}.mobile-settings-sheet{width:min(var(--mobile-sheet-width),100%);background:var(--mobile-surface-strong);border:1px solid var(--mobile-border);border-radius:var(--mobile-sheet-radius) var(--mobile-sheet-radius) 0 0;box-shadow:0 -18px 40px #0f172a24;color:var(--mobile-text)}.mobile-settings-header{border-bottom-color:var(--mobile-border);background:transparent}.mobile-shell .touch-settings-title{color:var(--mobile-text);font-size:var(--mobile-title-sm)}.mobile-shell .touch-settings-close,.mobile-shell .touch-settings-reset{color:var(--mobile-muted);border-radius:calc(var(--mobile-control-radius) * .85)}.mobile-shell .touch-settings-reset{padding:clamp(.42rem,1.8vw,.58rem) clamp(.58rem,2.5vw,.78rem);font-size:var(--mobile-label-sm)}.mobile-shell .touch-settings-close{width:var(--mobile-control-size-sm);height:var(--mobile-control-size-sm);font-size:clamp(1rem,4vw,1.3rem)}.mobile-shell .touch-settings-close:hover,.mobile-shell .touch-settings-reset:hover{background:var(--mobile-surface-soft);color:var(--mobile-text)}.mobile-settings-body{background:transparent}.mobile-draw-settings-preview{margin-top:-2px}.mobile-draw-settings-preview-track{display:flex;align-items:center;justify-content:center;min-height:clamp(3.1rem,12vw,3.75rem);padding:0 clamp(.85rem,3.6vw,1.1rem);border-radius:calc(var(--mobile-control-radius) * .9);background:var(--mobile-surface-soft);border:1px solid var(--mobile-border)}.mobile-draw-settings-preview-sample{width:100%;max-width:clamp(10rem,46vw,14rem);border-radius:999px;background:#111827}.mobile-draw-settings-preview-sample--highlighter{opacity:.4;border-radius:.3rem}.mobile-draw-settings-preview-sample--eraser{border:1px solid #94a3b8;background:#e2e8f0;width:auto;aspect-ratio:1;min-width:18px;max-width:none;border-radius:999px}.mobile-shell .touch-font-size-btn,.mobile-shell .touch-draw-tool-option{border-color:var(--mobile-border);background:var(--mobile-surface-soft);color:var(--mobile-text);border-radius:calc(var(--mobile-control-radius) * .85);padding:clamp(.55rem,2.2vw,.75rem) clamp(.55rem,2.2vw,.75rem);font-size:var(--mobile-label-sm)}.mobile-shell .touch-font-size-btn.active,.mobile-shell .touch-draw-tool-option.active{border-color:var(--mobile-accent-border);background:var(--mobile-accent-bg);color:var(--mobile-accent-text)}.mobile-shell .touch-stroke-label,.mobile-shell .touch-stroke-value{color:var(--mobile-muted);font-size:var(--mobile-label-sm)}.mobile-shell .touch-color-option{border-color:var(--mobile-border-strong);width:clamp(2rem,8.6vw,2.6rem);height:clamp(2rem,8.6vw,2.6rem)}.mobile-shell .touch-color-option.active{border-color:var(--mobile-accent-border);box-shadow:0 0 0 3px #4a90d92e}.mobile-shell .touch-custom-add{border-color:var(--mobile-border);background:var(--mobile-surface-soft);color:var(--mobile-text)}.mobile-shell .touch-custom-add:active:not(:disabled){background:var(--mobile-accent-bg);transform:translateY(1px)}.mobile-shell .touch-custom-add:disabled{opacity:.5}.touch-settings-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#0f172a59;z-index:3000;display:flex;align-items:flex-end;justify-content:center;padding:calc(12px + var(--safe-top)) calc(12px + var(--safe-right)) calc(12px + var(--safe-bottom)) calc(12px + var(--safe-left))}.touch-settings-sheet{width:min(420px,100%);background:#fff;border:1px solid #e2e8f0;border-radius:14px;box-shadow:0 20px 48px #0f172a33;overflow:hidden}.touch-settings-header{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:12px 14px;border-bottom:1px solid #e2e8f0;background:#fff}.touch-settings-title{font-size:13px;font-weight:600;color:#0f172a}.touch-settings-close,.touch-settings-reset{border:none;background:transparent;color:#64748b;border-radius:8px;cursor:pointer;transition:background .15s ease,color .15s ease}.touch-settings-reset{padding:7px 10px;font-size:12px}.touch-settings-close{width:32px;height:32px;font-size:20px;line-height:1;display:flex;align-items:center;justify-content:center}.touch-settings-close:hover,.touch-settings-reset:hover{background:#f1f5f9;color:#334155}.touch-settings-body{padding:12px 14px calc(12px + var(--safe-bottom));display:flex;flex-direction:column;gap:12px}.touch-draw-tool-selector{display:flex;gap:8px}.touch-draw-tool-option{flex:1;display:flex;align-items:center;justify-content:center;gap:6px;padding:10px;border:1px solid #e2e8f0;background:#f8fafc;border-radius:10px;color:#334155;font-size:12px;cursor:pointer;transition:background .15s ease,border-color .15s ease}.touch-draw-tool-option:hover{background:#f1f5f9;border-color:#cbd5e1}.touch-draw-tool-option.active{border-color:#4a90d9;background:#4a90d91f;color:#0f172a}.touch-draw-tool-option 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