:root{--bg-primary: #0d0d0d;--bg-secondary: #161616;--bg-tertiary: #1f1f1f;--bg-elevated: #252525;--text-primary: #f0ede6;--text-secondary: #9a9590;--text-muted: #5a5550;--accent: #e8a04c;--accent-hover: #f0b060;--accent-muted: rgba(232, 160, 76, .15);--border: #2a2a2a;--border-light: #333333;--success: #4caf50;--error: #e85555;--shadow-sm: 0 2px 8px rgba(0, 0, 0, .3);--shadow-md: 0 4px 16px rgba(0, 0, 0, .4);--shadow-lg: 0 8px 32px rgba(0, 0, 0, .5);--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px;--font-body: "Outfit", -apple-system, BlinkMacSystemFont, sans-serif;--font-mono: "JetBrains Mono", monospace;--transition-fast: .15s ease;--transition-normal: .25s ease}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-body);background:var(--bg-primary);color:var(--text-primary);line-height:1.5;min-height:100vh}body:before{content:"";position:fixed;top:0;right:0;bottom:0;left:0;background:radial-gradient(circle at 20% 20%,rgba(232,160,76,.03) 0%,transparent 50%),radial-gradient(circle at 80% 80%,rgba(232,160,76,.02) 0%,transparent 50%);pointer-events:none;z-index:-1}a{color:inherit;text-decoration:none}button{font-family:inherit;cursor:pointer}input{font-family:inherit}.app{display:flex;flex-direction:column;min-height:100vh}.main-content{flex:1;padding-top:60px}.header{position:fixed;top:0;left:0;right:0;height:60px;background:#0d0d0de6;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:0 24px;z-index:100}.logo{display:flex;align-items:center;gap:8px;font-weight:600;font-size:1.1rem;letter-spacing:-.02em}.logo-icon{color:var(--accent);font-size:1.4rem}.logo-text{color:var(--text-primary)}.user-info{display:flex;align-items:center}.nickname-display{display:flex;align-items:center;gap:8px;padding:8px 14px;background:var(--bg-tertiary);border:1px solid var(--border);border-radius:var(--radius-md);color:var(--text-secondary);font-size:.875rem;transition:all var(--transition-fast)}.nickname-display:hover{background:var(--bg-elevated);border-color:var(--border-light);color:var(--text-primary)}.nickname-label{font-size:.75rem;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted)}.nickname-value{font-weight:500;color:var(--accent)}.nickname-edit{display:flex;align-items:center;gap:6px}.nickname-edit input{width:160px;padding:8px 12px;background:var(--bg-tertiary);border:1px solid var(--accent);border-radius:var(--radius-sm);color:var(--text-primary);font-size:.875rem;outline:none}.btn-save,.btn-cancel{width:32px;height:32px;display:flex;align-items:center;justify-content:center;border:none;border-radius:var(--radius-sm);font-size:.9rem;transition:all var(--transition-fast)}.btn-save{background:var(--accent);color:var(--bg-primary)}.btn-save:hover{background:var(--accent-hover)}.btn-cancel{background:var(--bg-tertiary);color:var(--text-secondary)}.btn-cancel:hover{background:var(--bg-elevated);color:var(--text-primary)}.page-container{max-width:1200px;margin:0 auto;padding:32px 24px}.home-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:32px}.page-title{font-size:1.5rem;font-weight:600;letter-spacing:-.02em}.btn-new-topic{padding:10px 20px;background:var(--accent);color:var(--bg-primary);border:none;border-radius:var(--radius-md);font-weight:500;font-size:.9rem;transition:all var(--transition-fast)}.btn-new-topic:hover{background:var(--accent-hover);transform:translateY(-1px)}.btn-new-topic--active{background:var(--bg-tertiary);color:var(--text-secondary)}.btn-new-topic--active:hover{background:var(--bg-elevated);color:var(--text-primary);transform:none}.form-container{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-lg);padding:24px;margin-bottom:32px;animation:slideDown .3s ease}@keyframes slideDown{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.create-topic-form{display:flex;flex-direction:column;gap:16px}.drop-zone{position:relative;border:2px dashed var(--border-light);border-radius:var(--radius-lg);padding:48px;text-align:center;cursor:pointer;transition:all var(--transition-fast)}.drop-zone:hover,.drop-zone--active{border-color:var(--accent);background:var(--accent-muted)}.drop-zone--has-preview{padding:0;border-style:solid}.drop-zone__placeholder{display:flex;flex-direction:column;align-items:center;gap:8px;color:var(--text-secondary)}.drop-zone__icon{font-size:2rem;color:var(--text-muted)}.drop-zone__text{font-size:.95rem}.drop-zone__hint{font-size:.8rem;color:var(--text-muted)}.drop-zone__preview{position:relative}.drop-zone__preview img{width:100%;max-height:300px;object-fit:cover;border-radius:var(--radius-lg)}.drop-zone__clear{position:absolute;top:12px;right:12px;width:32px;height:32px;display:flex;align-items:center;justify-content:center;background:var(--bg-primary);border:1px solid var(--border);border-radius:50%;color:var(--text-secondary);font-size:.9rem;transition:all var(--transition-fast)}.drop-zone__clear:hover{background:var(--error);border-color:var(--error);color:#fff}.input-title{width:100%;padding:14px 16px;background:var(--bg-tertiary);border:1px solid var(--border);border-radius:var(--radius-md);color:var(--text-primary);font-size:1rem;outline:none;transition:border-color var(--transition-fast)}.input-title::placeholder{color:var(--text-muted)}.input-title:focus{border-color:var(--accent)}.form-error{padding:10px 14px;background:#e855551a;border:1px solid rgba(232,85,85,.3);border-radius:var(--radius-sm);color:var(--error);font-size:.875rem}.btn-submit{align-self:flex-end;padding:12px 24px;background:var(--accent);color:var(--bg-primary);border:none;border-radius:var(--radius-md);font-weight:500;font-size:.95rem;transition:all var(--transition-fast)}.btn-submit:hover:not(:disabled){background:var(--accent-hover);transform:translateY(-1px)}.btn-submit:disabled{opacity:.5;cursor:not-allowed}.topics-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}.topic-card{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;transition:all var(--transition-normal)}.topic-card:hover{border-color:var(--border-light);transform:translateY(-4px);box-shadow:var(--shadow-lg)}.topic-card--new{animation:topicPulse 2s ease}@keyframes topicPulse{0%{box-shadow:0 0 #e8a04c66}50%{box-shadow:0 0 0 8px #e8a04c00}to{box-shadow:0 0 #e8a04c00}}.topic-card__image-wrapper{aspect-ratio:16/10;overflow:hidden;background:var(--bg-tertiary)}.topic-card__image{width:100%;height:100%;object-fit:cover;transition:transform var(--transition-normal)}.topic-card:hover .topic-card__image{transform:scale(1.05)}.topic-card__content{padding:16px}.topic-card__title{font-size:1rem;font-weight:500;line-height:1.4;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.topic-card__meta{display:flex;align-items:center;gap:6px;font-size:.8rem;color:var(--text-secondary)}.topic-card__author{color:var(--accent)}.topic-card__separator{color:var(--text-muted)}.loading{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;padding:80px 20px;color:var(--text-secondary)}.loading-spinner{width:40px;height:40px;border:3px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;padding:80px 20px;text-align:center;color:var(--text-secondary)}.empty-state__icon{font-size:3rem;color:var(--text-muted)}.error-state{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;padding:80px 20px;text-align:center}.error-state__icon{font-size:3rem;color:var(--error)}.error-message{padding:12px 16px;background:#e855551a;border:1px solid rgba(232,85,85,.3);border-radius:var(--radius-md);color:var(--error);margin-bottom:24px}.btn-back{padding:10px 20px;background:var(--bg-tertiary);border:1px solid var(--border);border-radius:var(--radius-md);color:var(--text-secondary);font-size:.9rem;transition:all var(--transition-fast)}.btn-back:hover{background:var(--bg-elevated);color:var(--text-primary)}.topic-page{display:grid;grid-template-columns:1fr 400px;min-height:calc(100vh - 60px)}@media (max-width: 900px){.topic-page{grid-template-columns:1fr}}.topic-content{padding:24px;border-right:1px solid var(--border)}@media (max-width: 900px){.topic-content{border-right:none;border-bottom:1px solid var(--border)}}.back-link{display:inline-flex;align-items:center;padding:8px 0;color:var(--text-secondary);font-size:.9rem;margin-bottom:16px;transition:color var(--transition-fast)}.back-link:hover{color:var(--accent)}.topic-image-container{border-radius:var(--radius-lg);overflow:hidden;margin-bottom:20px;background:var(--bg-secondary)}.topic-image{width:100%;max-height:500px;object-fit:contain}.topic-info{padding:4px 0}.topic-title{font-size:1.5rem;font-weight:600;line-height:1.3;margin-bottom:12px}.topic-meta{display:flex;align-items:center;gap:8px;color:var(--text-secondary);font-size:.9rem}.topic-author{color:var(--accent)}.topic-separator{color:var(--text-muted)}.chat-section{display:flex;flex-direction:column;height:calc(100vh - 60px);background:var(--bg-secondary)}@media (max-width: 900px){.chat-section{height:500px}}.chat-header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid var(--border)}.chat-header h2{font-size:1rem;font-weight:500}.message-count{font-size:.8rem;color:var(--text-muted);font-family:var(--font-mono)}.chat-messages{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:12px}.chat-empty{flex:1;display:flex;align-items:center;justify-content:center;color:var(--text-muted);font-size:.9rem;font-style:italic}.chat-message{padding:12px 14px;background:var(--bg-tertiary);border-radius:var(--radius-md);border-left:2px solid transparent;animation:messageIn .3s ease}@keyframes messageIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.chat-message--new{border-left-color:var(--accent);background:var(--accent-muted)}.chat-message__header{display:flex;align-items:center;justify-content:space-between;margin-bottom:6px}.chat-message__author{font-weight:500;font-size:.85rem;color:var(--accent)}.chat-message__time{font-size:.75rem;color:var(--text-muted);font-family:var(--font-mono)}.chat-message__content{font-size:.9rem;line-height:1.5;color:var(--text-primary);word-break:break-word}.chat-input-form{display:flex;gap:10px;padding:16px;border-top:1px solid var(--border);background:var(--bg-primary)}.chat-input{flex:1;padding:12px 14px;background:var(--bg-tertiary);border:1px solid var(--border);border-radius:var(--radius-md);color:var(--text-primary);font-size:.9rem;outline:none;transition:border-color var(--transition-fast)}.chat-input::placeholder{color:var(--text-muted)}.chat-input:focus{border-color:var(--accent)}.btn-send{padding:12px 20px;background:var(--accent);color:var(--bg-primary);border:none;border-radius:var(--radius-md);font-weight:500;font-size:.9rem;transition:all var(--transition-fast)}.btn-send:hover:not(:disabled){background:var(--accent-hover)}.btn-send:disabled{opacity:.5;cursor:not-allowed}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:var(--bg-secondary)}::-webkit-scrollbar-thumb{background:var(--border-light);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}