:root{--bg-main: #ffffff;--bg-sidebar: #f7f7f8;--bg-user-bubble: #f4f4f4;--border-composer: #d8e4f5;--accent: #3b6cff;--accent-soft: #e8eeff;--text: #1a1a1a;--text-secondary: #6b6b6b;--radius-item: 8px;--radius-composer: 22px;font-family:PingFang SC,Microsoft YaHei,system-ui,-apple-system,sans-serif}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg-main);color:var(--text)}.app{display:flex;height:100%;min-height:100vh}.sidebar{width:260px;flex-shrink:0;background:var(--bg-sidebar);display:flex;flex-direction:column;padding:16px 12px;border-right:1px solid #ececee}.brand{display:flex;align-items:center;gap:10px;padding:8px 10px 16px}.brand-avatar{width:32px;height:32px;border-radius:50%;background:linear-gradient(135deg,#6b9dff,#3b6cff)}.brand-avatar-img{width:32px;height:32px;border-radius:50%;object-fit:cover;flex-shrink:0}.brand-name{font-size:17px;font-weight:600;letter-spacing:.02em}.btn-new{margin:0 8px 12px;padding:10px 14px;border:none;border-radius:10px;background:var(--accent);color:#fff;font-size:14px;font-weight:500;cursor:pointer}.btn-new:hover{filter:brightness(1.05)}.chat-list{flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:4px;padding:4px 4px 12px}.chat-item{text-align:left;border:none;background:transparent;border-radius:var(--radius-item);padding:12px 14px;cursor:pointer;color:var(--text);font-size:14px}.chat-item-with-icon{display:flex;align-items:center;gap:10px}.chat-item-with-icon .nav-item-icon{flex-shrink:0;display:inline-flex;align-items:center;justify-content:center;width:20px;height:20px;color:#6b7280}.chat-item-with-icon .nav-item-icon svg{display:block}.chat-item-with-icon .nav-item-label{flex:1;min-width:0;line-height:1.35}.chat-item-with-icon:hover .nav-item-icon,.chat-item-with-icon.active .nav-item-icon{color:var(--text)}.chat-item-with-icon.active .nav-item-icon{color:var(--accent)}.chat-item-logout .nav-item-icon{color:#9ca3af}.chat-item-logout:hover 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p:first-child{margin-top:0}.intro-start{margin:0!important}.card-picker{max-width:880px;margin:0 auto;padding:12px 24px 8px}.card-picker-hint{margin:0 0 14px;font-size:14px;color:var(--text-secondary)}.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:12px}.stimulus-picker-scroll{flex:1;min-height:0;overflow-y:auto;padding-bottom:24px}.stimulus-picker-panel{padding-bottom:32px}.stimulus-picker-lead{font-size:15px;color:var(--text-secondary)}.stimulus-card-grid{margin-top:8px}.stimulus-card{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;min-height:112px;border:1px solid #e4e4e7;border-radius:14px;padding:20px 16px;background:#fff;cursor:pointer;text-align:center;font:inherit;color:inherit;transition:border-color .15s,box-shadow .15s,transform .12s;box-shadow:0 1px 3px #0000000a}.stimulus-card:hover:not(:disabled){border-color:var(--accent);box-shadow:0 4px 16px 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var(--border-composer);font-size:15px;line-height:1.65}.card-option-stimulus{min-height:76px;display:flex;align-items:center;justify-content:center}.card-option-stimulus-label{font-size:18px;font-weight:600;color:var(--text)}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:1000;background:#00000059;display:flex;align-items:center;justify-content:center;padding:24px}.modal-card{width:100%;max-width:400px;background:#fff;border-radius:16px;padding:22px 24px 20px;box-shadow:0 12px 40px #00000026}.modal-title{margin:0 0 6px;font-size:18px;font-weight:600}.modal-sub{margin:0 0 18px;font-size:13px;color:var(--text-secondary)}.profile-stats{margin:0 0 20px}.profile-stat-row{display:grid;grid-template-columns:1fr auto;gap:8px 16px;padding:10px 0;border-bottom:1px solid #f0f0f0;font-size:14px}.profile-stat-row:last-of-type{border-bottom:none}.profile-stat-row dt{margin:0;color:var(--text-secondary);font-weight:400}.profile-stat-row 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