*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--color-bg: #f8f9fa;--color-surface: #ffffff;--color-border: #e5e7eb;--color-text: #111827;--color-muted: #6b7280;--color-primary: #6366f1;--color-primary-dark: #4f46e5;--color-danger: #ef4444;--color-success: #22c55e;--color-warning: #f97316;--radius: 8px;--radius-sm: 4px;--shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.05);--shadow-md: 0 4px 6px -1px rgba(0,0,0,.08);font-size:14px}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--color-bg);color:var(--color-text);line-height:1.5;height:100vh;overflow:hidden}button{cursor:pointer;border:none;background:none;font:inherit}textarea,input{font:inherit}.app{display:flex;flex-direction:column;height:100vh}.app-header{display:flex;align-items:center;gap:24px;padding:0 20px;height:56px;background:var(--color-surface);border-bottom:1px solid var(--color-border);flex-shrink:0;box-shadow:var(--shadow)}.app-brand{display:flex;align-items:baseline;gap:8px}.brand-name{font-size:20px;font-weight:700;color:var(--color-primary);letter-spacing:-.5px}.brand-sub{font-size:11px;color:var(--color-muted)}.app-nav{display:flex;gap:4px}.nav-btn{display:flex;align-items:center;gap:6px;padding:6px 14px;border-radius:var(--radius);color:var(--color-muted);font-size:13px;font-weight:500;transition:all .15s}.nav-btn:hover{background:var(--color-bg);color:var(--color-text)}.nav-btn--active{background:#ede9fe;color:var(--color-primary)}.nav-icon{font-size:14px}.app-body{display:flex;flex:1;overflow:hidden}.app-main{flex:1;overflow:auto;padding:20px}.app-sidebar{width:380px;flex-shrink:0;border-left:1px solid var(--color-border);background:var(--color-surface);display:flex;flex-direction:column}.section-header{display:flex;align-items:baseline;gap:12px;margin-bottom:16px}.section-title{font-size:18px;font-weight:600}.section-hint{font-size:12px;color:var(--color-muted)}.loading-state{padding:40px;text-align:center;color:var(--color-muted)}.error-state{padding:40px;text-align:center;color:var(--color-danger)}.empty-state{display:flex;flex-direction:column;align-items:center;gap:8px;padding:60px 20px;color:var(--color-muted);text-align:center}.empty-icon{font-size:36px}.task-board{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;height:100%;align-items:start}.task-column{background:var(--color-surface);border-radius:var(--radius);border:1px solid var(--color-border);overflow:hidden}.column-header{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;border-top:3px solid 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.15s;max-height:120px;overflow-y:auto}.chat-input:focus{outline:none;border-color:var(--color-primary)}.chat-input:disabled{background:var(--color-bg)}.chat-send{width:36px;height:36px;border-radius:50%;background:var(--color-primary);color:#fff;font-size:16px;display:flex;align-items:center;justify-content:center;transition:opacity .15s,transform .1s;flex-shrink:0}.chat-send:hover{opacity:.9;transform:scale(1.05)}.chat-send:disabled{opacity:.4;cursor:default;transform:none}