:root{--bg-main: #0a0a0f;--bg-sidebar: rgba(18, 18, 26, .6);--bg-panel: rgba(24, 24, 34, .7);--bg-glass: rgba(30, 30, 42, .4);--text-main: #f0f0f5;--text-muted: #8a8a9d;--text-heading: #ffffff;--accent-base: #6366f1;--accent-glow: rgba(99, 102, 241, .5);--accent-hover: #4f46e5;--success: #10b981;--warning: #f59e0b;--danger: #ef4444;--border-subtle: rgba(255, 255, 255, .08);--border-focus: rgba(99, 102, 241, .4);--font-ui: "Inter", system-ui, sans-serif;--font-editor: "Playfair Display", serif;font-family:var(--font-ui);line-height:1.5;font-weight:400;color-scheme:dark;color:var(--text-main);background-color:var(--bg-main);font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}*{box-sizing:border-box;margin:0;padding:0}body{margin:0;display:flex;min-height:100vh;background:radial-gradient(circle at 15% 50%,rgba(99,102,241,.08) 0%,transparent 40%),radial-gradient(circle at 85% 30%,rgba(139,92,246,.08) 0%,transparent 40%),var(--bg-main);overflow:hidden}#root{width:100vw;height:100vh;display:flex}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes pulse-glow{0%{box-shadow:0 0 0 0 var(--accent-glow)}70%{box-shadow:0 0 0 10px #6366f100}to{box-shadow:0 0 #6366f100}}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border-subtle);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}.glass-panel{background:var(--bg-glass);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border:1px solid var(--border-subtle)}.btn-primary{background:linear-gradient(135deg,var(--accent-base),var(--accent-hover));color:#fff;border:none;border-radius:8px;padding:8px 16px;font-family:var(--font-ui);font-weight:500;cursor:pointer;transition:all .2s ease;display:inline-flex;align-items:center;gap:8px;box-shadow:0 4px 12px #6366f133}.btn-primary:hover{transform:translateY(-1px);box-shadow:0 6px 16px #6366f14d}.btn-secondary{background:transparent;color:var(--text-main);border:1px solid var(--border-subtle);border-radius:8px;padding:8px 16px;font-family:var(--font-ui);font-weight:500;cursor:pointer;transition:all .2s ease;display:inline-flex;align-items:center;gap:8px}.btn-secondary:hover{background:#ffffff0d;border-color:#fff3}.btn-icon{background:transparent;border:none;color:var(--text-muted);cursor:pointer;padding:6px;border-radius:6px;transition:all .2s;display:flex;align-items:center;justify-content:center}.btn-icon:hover{background:#ffffff0d;color:var(--text-main)}.editor-textarea{width:100%;height:100%;background:transparent;border:none;resize:none;outline:none;font-family:var(--font-editor);font-size:1.15rem;line-height:1.8;color:var(--text-main);padding:2rem}.editor-textarea::placeholder{color:var(--text-muted);opacity:.5}.app-container{display:flex;width:100%;height:100%}.sidebar{width:280px;background:var(--bg-sidebar);border-right:1px solid var(--border-subtle);display:flex;flex-direction:column;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px)}.main-content{flex:1;display:flex;flex-direction:column;position:relative}.top-nav{height:60px;border-bottom:1px solid var(--border-subtle);display:flex;align-items:center;padding:0 1.5rem;justify-content:space-between;background:#0a0a0f66;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);z-index:10}.ai-panel{width:350px;background:var(--bg-panel);border-left:1px solid var(--border-subtle);display:flex;flex-direction:column;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);transform:translate(0);transition:transform .3s cubic-bezier(.16,1,.3,1)}.ai-panel.collapsed{transform:translate(100%);position:absolute;right:0;height:100%}.chapter-list{flex:1;overflow-y:auto;padding:1rem;display:flex;flex-direction:column;gap:.5rem}.chapter-item{padding:.75rem 1rem;border-radius:8px;cursor:pointer;transition:all .2s;display:flex;align-items:center;gap:.75rem;color:var(--text-muted);border:1px solid transparent}.chapter-item:hover{background:#ffffff08}.chapter-item.active{background:#6366f11a;color:var(--accent-base);border-color:#6366f133}.chat-messages{flex:1;overflow-y:auto;padding:1.5rem;display:flex;flex-direction:column;gap:1rem}.chat-msg{padding:1rem;border-radius:12px;line-height:1.5;font-size:.95rem;animation:fadeIn .3s ease forwards}.chat-msg.user{background:var(--bg-glass);border-bottom-right-radius:2px;margin-left:1rem}.chat-msg.ai{background:linear-gradient(145deg,#6366f11a,#8b5cf61a);border:1px solid var(--border-focus);border-bottom-left-radius:2px;margin-right:1rem;position:relative}.chat-input-area{padding:1.5rem;border-top:1px solid var(--border-subtle);background:#12121acc}.input-container{display:flex;background:var(--bg-main);border:1px solid var(--border-subtle);border-radius:12px;padding:.5rem;transition:border-color .2s}.input-container:focus-within{border-color:var(--accent-base);box-shadow:0 0 0 2px var(--accent-glow)}.input-container input{flex:1;background:transparent;border:none;outline:none;color:var(--text-main);padding:.5rem}