:root{--bg: #0c0c0e;--surface: #131317;--elevated: #1a1a20;--raised: #22222a;--border: #26262c;--border-strong: #34343c;--text: #f4f1ec;--text-muted: #9a9aa3;--text-dim: #5e5e68;--accent: #ff6b35;--accent-soft: rgba(255, 107, 53, .14);--accent-faint: rgba(255, 107, 53, .06);--brand-gradient-from: #ff6b35;--brand-gradient-to: #8b5cf6;--due: #ff6b35;--learning: #f3c969;--mastered: #7ad36f;--new: #6b9bff;--font-serif: "Instrument Serif", "Times New Roman", Georgia, serif;--font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;--font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;--s-1: 4px;--s-2: 8px;--s-3: 12px;--s-4: 16px;--s-5: 24px;--s-6: 32px;--s-7: 48px;--s-8: 64px;--r-sm: 6px;--r-md: 10px;--r-lg: 14px;--r-xl: 20px;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .4);--shadow-md: 0 8px 24px rgba(0, 0, 0, .4);--shadow-lg: 0 20px 60px rgba(0, 0, 0, .55);--bg-translucent: rgba(12, 12, 14, .85);--bg-translucent-strong: rgba(12, 12, 14, .92);--bg-fade: 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.page{flex:1;min-width:0;max-width:none;margin:0}.deck-chat-aside{flex-shrink:0;width:420px;position:sticky;top:64px;align-self:flex-start;height:calc(100vh - 64px);border-left:1px solid var(--border, #26262c);background:var(--surface, #131317)}.deck-chat-panel{height:100%;display:flex;flex-direction:column}.deck-chat-inner{height:100%;display:flex;flex-direction:column;background:var(--surface, #131317)}.deck-chat-inner .modal-head{border-bottom:1px solid var(--border, #26262c);padding:var(--s-4, 16px) var(--s-5, 24px);flex-shrink:0}.deck-chat-inner .modal-head h2{font-size:18px;margin:0 0 4px}.deck-chat-inner .chat-thread{flex:1;min-height:0}@media (max-width: 980px){.deck-layout.with-chat{flex-direction:column}.deck-chat-aside{width:100%;position:relative;top:0;height:75vh;border-left:none;border-top:1px solid var(--border, #26262c)}}.attach-strip{display:flex;flex-wrap:wrap;gap:6px;padding:0 var(--s-5, 24px) 8px;flex-shrink:0}.attach-chip{display:inline-flex;align-items:center;gap:6px;background:var(--accent-soft, rgba(255, 92, 58, .14));border:1px solid var(--accent, #ff6b35);border-radius:var(--r-sm, 6px);padding:4px 6px 4px 10px;font-size:12px;color:var(--text, #f4f1ec);max-width:260px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.attach-chip .attach-size{font-family:var(--font-mono, monospace);font-size:10px;color:var(--text-muted, #9a9aa3);flex-shrink:0}.attach-chip .attach-remove{background:transparent;color:var(--text-muted, #9a9aa3);width:20px;height:20px;border-radius:4px;font-size:14px;line-height:1;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;padding:0;border:none;flex-shrink:0}.attach-chip .attach-remove:hover{background:var(--highlight-soft-strong);color:var(--text, #f4f1ec)}