.app{display:flex;flex-direction:column;height:100dvh;max-width:720px;margin:0 auto;width:100%}.loading{height:100dvh;display:grid;place-items:center;font-size:24px;opacity:.4}.header{display:flex;align-items:center;justify-content:space-between;padding:max(env(safe-area-inset-top),12px) 16px 8px 16px;border-bottom:1px solid var(--border);background:var(--bg)}.header h1{margin:0;font-size:22px;font-weight:700;letter-spacing:-.5px;color:var(--primary)}.header-actions{display:flex;gap:4px}.icon-btn{width:40px;height:40px;border-radius:10px;font-size:20px;display:grid;place-items:center}.icon-btn:active{background:var(--muted)}.empty{flex:1;display:flex;flex-direction:column;justify-content:center;align-items:center;padding:24px;text-align:center;gap:8px}.empty p{margin:0}.empty-hint{opacity:.6;font-size:14px}.pdf-picker{display:flex;align-items:center;gap:8px;padding:8px 16px;border-bottom:1px solid var(--border);background:var(--bg)}.pdf-picker select{flex:1;height:40px;padding:0 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var(--border);border-radius:999px;font-size:13px;font-weight:600;color:var(--primary);cursor:pointer;display:inline-flex;align-items:center;gap:4px}.msg-study-btn:active{background:var(--muted)}.mode-chips{display:flex;gap:6px;padding:8px 12px 0;overflow-x:auto;-webkit-overflow-scrolling:touch}.mode-chips::-webkit-scrollbar{height:0}.mode-chip{flex-shrink:0;padding:6px 12px;border-radius:999px;border:1px solid var(--border);background:var(--bg);font-size:13px;font-weight:500;color:var(--fg);opacity:.65;transition:all .15s;white-space:nowrap}.mode-chip:active{background:var(--muted)}.mode-chip.active{background:var(--primary);color:var(--user-fg);border-color:var(--primary);opacity:1}.mode-chip:disabled{opacity:.3}.composer{display:flex;gap:8px;padding:8px 12px max(env(safe-area-inset-bottom),12px) 12px;border-top:1px solid var(--border);background:var(--bg)}.composer textarea{flex:1;resize:none;border-radius:16px;border:1px solid var(--border);background:var(--muted);padding:10px 14px;font-size:16px;line-height:1.4;max-height:140px}.composer textarea:focus{outline:none;border-color:var(--primary)}.composer button{align-self:flex-end;height:40px;padding:0 16px;border-radius:14px;background:var(--primary);color:var(--user-fg);font-weight:600}.composer button:disabled{opacity:.4}.settings{height:100dvh;max-width:480px;margin:0 auto;padding:max(env(safe-area-inset-top),24px) 20px env(safe-area-inset-bottom) 20px;display:flex;flex-direction:column;gap:16px;overflow-y:auto}.settings h2{margin:0 0 8px;color:var(--primary);font-size:24px}.settings label{display:flex;flex-direction:column;gap:6px;font-size:14px;font-weight:600}.settings input,.settings select{height:44px;padding:0 12px;border-radius:10px;border:1px solid var(--border);background:var(--muted);font-size:16px}.settings .hint{margin:-8px 0 0;font-size:13px;opacity:.7;line-height:1.4}.settings .actions{margin-top:auto;display:flex;gap:8px;justify-content:flex-end}.settings .actions button{height:44px;padding:0 20px;border-radius:12px;font-weight:600;background:var(--muted);border:1px solid var(--border)}.settings .actions .primary{background:var(--primary);color:var(--user-fg);border-color:var(--primary)}.settings .actions button:disabled{opacity:.4}.studies{display:flex;flex-direction:column;height:100dvh;max-width:720px;margin:0 auto;width:100%}.studies-header{display:flex;align-items:center;gap:12px;padding:max(env(safe-area-inset-top),12px) 16px 12px 16px;border-bottom:1px solid var(--border)}.studies-header h2{margin:0;font-size:18px;font-weight:700;color:var(--primary)}.studies-header p{margin:0;font-size:12px;color:var(--fg);opacity:.6;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.studies-list{flex:1;overflow-y:auto;padding:12px;display:flex;flex-direction:column;gap:10px}.study-card{display:flex;gap:12px;padding:12px;background:var(--muted);border:1px solid var(--border);border-radius:14px;align-items:flex-start}.study-flashcards{border-left:3px solid #6c63ff}.study-mindmap{border-left:3px solid #58a6ff}.study-icon{font-size:28px;line-height:1;flex-shrink:0}.study-body{flex:1;min-width:0}.study-body h3{margin:0 0 4px;font-size:15px;font-weight:600;color:var(--fg)}.study-meta{margin:0 0 4px;font-size:12px;color:var(--fg);opacity:.6}.study-topic{margin:0;font-size:12px;font-style:italic;color:var(--fg);opacity:.5;overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}.study-actions{display:flex;flex-direction:column;gap:4px;flex-shrink:0}.study-actions button{height:32px;min-width:32px;padding:0 10px;border-radius:8px;background:var(--bg);border:1px solid var(--border);font-size:14px;color:var(--fg)}.study-actions .study-btn-primary{background:var(--primary);color:var(--user-fg);border-color:var(--primary);font-weight:600;font-size:13px}.study-actions .study-btn-danger:active{background:#b3464626}.study-view{display:flex;flex-direction:column;height:100dvh;width:100%;background:var(--bg)}.study-view-header{display:flex;align-items:center;gap:8px;padding:max(env(safe-area-inset-top),8px) 12px 8px 12px;border-bottom:1px solid var(--border);background:var(--bg);flex-shrink:0}.study-view-title{flex:1;display:flex;align-items:center;gap:8px;font-size:14px;font-weight:600;color:var(--fg);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.study-view-icon{font-size:18px;flex-shrink:0}.study-view-iframe{flex:1;width:100%;border:none;background:#fff}:root{color-scheme:light dark;--bg: #f8f5f0;--fg: #1a1a1a;--primary: #1a3a5c;--accent: #c9a961;--gold: #f4d35e;--muted: #ece8df;--muted-2: #d4cfc4;--border: #c8c4ba;--user-bg: #1a3a5c;--user-fg: #f8f5f0;--assistant-bg: #ece8df;--assistant-fg: #1a1a1a;--danger: #b34646}@media (prefers-color-scheme: dark){:root{--bg: #181613;--fg: #f3eee3;--primary: #c9a961;--accent: #f4d35e;--muted: #2a2620;--muted-2: #3d3830;--border: #3d3830;--user-bg: #c9a961;--user-fg: #181613;--assistant-bg: #2a2620;--assistant-fg: #f3eee3;--danger: #d97070}}*{box-sizing:border-box}html,body,#root{margin:0;padding:0;height:100dvh;overflow:hidden}body{background:var(--bg);color:var(--fg);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,system-ui,sans-serif;font-size:16px;line-height:1.5;-webkit-tap-highlight-color:transparent;-webkit-font-smoothing:antialiased}button{font:inherit;cursor:pointer;border:none;background:transparent;color:inherit}input,textarea,select{font:inherit;color:inherit}a{color:var(--primary)}