:root{--md-sys-typescale-font: "Roboto Flex", "Noto Sans SC", -apple-system, BlinkMacSystemFont, sans-serif;--md-sys-typescale-mono: "Roboto Mono", monospace;--md-sys-shape-corner-xs: 4px;--md-sys-shape-corner-sm: 8px;--md-sys-shape-corner-md: 12px;--md-sys-shape-corner-lg: 16px;--md-sys-shape-corner-xl: 28px;--md-sys-shape-corner-full: 999px;--md-sys-elevation-0: none;--md-sys-elevation-1: 0 1px 3px 1px rgba(0,0,0,.15), 0 1px 2px rgba(0,0,0,.3);--md-sys-elevation-2: 0 2px 6px 2px rgba(0,0,0,.15), 0 1px 2px rgba(0,0,0,.3);--md-sys-elevation-3: 0 4px 8px 3px rgba(0,0,0,.15), 0 1px 3px rgba(0,0,0,.3);--sidebar-width: 280px;--top-bar-height: 64px;--md-sys-color-success: #2e7d32;--chat-bg: 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var(--sidebar-width))}.sidebar-content{flex:1;display:flex;flex-direction:column;padding:16px;overflow:hidden}.new-chat-btn{display:flex;align-items:center;gap:8px;width:100%;padding:14px 20px;background:var(--md-sys-color-primary-container);color:var(--md-sys-color-on-primary-container);border:none;border-radius:var(--md-sys-shape-corner-full);font-size:14px;font-weight:500;cursor:pointer;transition:all .2s ease;font-family:var(--md-sys-typescale-font)}.new-chat-btn:hover{background:var(--md-sys-color-primary);color:var(--md-sys-color-on-primary);box-shadow:var(--md-sys-elevation-1)}.new-chat-btn svg{flex-shrink:0}.conversation-list{flex:1;overflow-y:auto;margin-top:16px}.empty-state{color:var(--md-sys-color-on-surface-variant);text-align:center;padding:24px 0;font-size:13px}.conversation-item{display:flex;align-items:center;gap:12px;padding:12px 14px;border-radius:var(--md-sys-shape-corner-md);cursor:pointer;transition:background .15s 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var(--md-sys-color-outline-variant)}.login-icon{display:flex;align-items:center;justify-content:center;width:80px;height:80px;margin:0 auto 24px;background:var(--md-sys-color-primary-container);color:var(--md-sys-color-primary);border-radius:var(--md-sys-shape-corner-lg)}.login-icon md-icon{font-size:48px;width:48px;height:48px}.login-title{font-size:28px;font-weight:400;color:var(--md-sys-color-on-surface);margin-bottom:8px;letter-spacing:-.5px}.login-subtitle{font-size:15px;color:var(--md-sys-color-primary);margin-bottom:16px}.login-desc{font-size:13px;color:var(--md-sys-color-on-surface-variant);line-height:1.6;margin-bottom:32px}.dingtalk-login-btn{display:flex;align-items:center;justify-content:center;gap:10px;width:100%;padding:14px 24px;background:#0089ff;color:#fff;border:none;border-radius:var(--md-sys-shape-corner-full);font-size:15px;font-weight:500;cursor:pointer;transition:all .2s 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rgba(0,0,0,.32))}.settings-content{min-width:320px;padding:8px 24px 0}.settings-dialog-headline{font-size:1.5rem;font-weight:500;color:var(--md-sys-color-on-surface);padding:24px 24px 8px}.settings-section{margin-bottom:4px}.settings-section-title{font-size:13px;font-weight:500;color:var(--md-sys-color-on-surface-variant);margin-bottom:12px}.theme-options{display:flex;gap:10px}.theme-option{display:flex;flex-direction:column;align-items:center;gap:8px;flex:1;padding:16px 8px;background:var(--md-sys-color-surface-container);border:2px solid transparent;border-radius:var(--md-sys-shape-corner-md);color:var(--md-sys-color-on-surface-variant);font-size:12px;font-family:var(--md-sys-typescale-font);cursor:pointer;transition:background .15s ease,border-color .15s ease,color .15s ease}.theme-option md-icon{font-size:24px;width:24px;height:24px}.theme-option:hover{background:var(--md-sys-color-surface-container-high)}.theme-option.active{background:var(--md-sys-color-primary-container);border-color:var(--md-sys-color-primary);color:var(--md-sys-color-on-primary-container)}.settings-actions{display:flex;gap:8px;align-items:center;padding:16px 24px 24px}.settings-actions .logout-btn{margin-right:auto;--md-text-button-label-text-color: var(--md-sys-color-error);color:var(--md-sys-color-error)}.callback-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:var(--md-sys-color-surface-dim)}.callback-card{background:var(--md-sys-color-surface);border-radius:var(--md-sys-shape-corner-xl);padding:48px 40px;text-align:center;box-shadow:var(--md-sys-elevation-3);border:1px solid var(--md-sys-color-outline-variant);max-width:400px;width:90%}.callback-icon{display:flex;align-items:center;justify-content:center;width:72px;height:72px;margin:0 auto 20px;background:var(--md-sys-color-primary-container);color:var(--md-sys-color-primary);border-radius:50%;font-size:28px}.callback-icon.loading{animation:pulse 1.5s ease-in-out infinite}.callback-icon.error{background:var(--md-sys-color-error);color:var(--md-sys-color-on-error)}.callback-card h2{color:var(--md-sys-color-on-surface);font-size:20px;font-weight:500;margin-bottom:8px}.callback-card p{color:var(--md-sys-color-on-surface-variant);font-size:14px;margin-bottom:24px}.callback-card button{background:var(--md-sys-color-primary);color:var(--md-sys-color-on-primary);border:none;padding:10px 24px;border-radius:var(--md-sys-shape-corner-full);font-size:14px;cursor:pointer}.callback-card button:hover{box-shadow:var(--md-sys-elevation-1)}.loading-spinner{width:32px;height:32px;border:3px solid var(--md-sys-color-outline-variant);border-top-color:var(--md-sys-color-primary);border-radius:50%;animation:spin .8s linear infinite;margin:0 auto}@keyframes spin{to{transform:rotate(360deg)}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}