:root{--primary: #044ED7;--primary-dark: #0338A6;--primary-light: #EBF2FC;--primary-lighter: #F5F8FD;--accent: #FF6E00;--accent-light: #FFF4EB;--bg-primary: #FFFFFF;--bg-secondary: #F7F9FB;--bg-tertiary: #EEF2F6;--text-primary: #1A202C;--text-secondary: #5A6775;--text-tertiary: #9AA5B4;--text-inverse: #FFFFFF;--success: #10B981;--border: rgba(4, 78, 215, .12);--shadow-xs: 0 1px 2px rgba(4, 78, 215, .04);--shadow-sm: 0 2px 8px rgba(4, 78, 215, .06);--shadow-md: 0 4px 16px rgba(4, 78, 215, .1);--shadow-lg: 0 8px 32px rgba(4, 78, 215, .14);--shadow-glow: 0 0 0 3px rgba(4, 78, 215, .12);--safe-top: env(safe-area-inset-top, 0px);--safe-bottom: env(safe-area-inset-bottom, 0px);--header-height: 56px;--input-height: 80px;--font-primary: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-secondary: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--ease-out: cubic-bezier(.25, .46, .45, .94);--ease-spring: cubic-bezier(.34, 1.56, .64, 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.subtitle{font-size:11px;color:var(--text-tertiary)}.header-right{display:flex;align-items:center;gap:6px}.icon-btn{width:36px;height:36px;border:none;background:var(--bg-secondary);border-radius:10px;display:flex;align-items:center;justify-content:center;color:var(--text-secondary);cursor:pointer;transition:all .2s var(--ease-out)}.icon-btn:hover{background:var(--primary-light);color:var(--primary)}.icon-btn:active{transform:scale(.95)}.chat-area{flex:1;overflow-y:auto;overflow-x:hidden;scroll-behavior:smooth}.chat-messages{padding:16px;padding-bottom:calc(var(--input-height) + 40px);max-width:720px;margin:0 auto}.chat-area::-webkit-scrollbar{width:4px}.chat-area::-webkit-scrollbar-track{background:transparent}.chat-area::-webkit-scrollbar-thumb{background:var(--text-tertiary);border-radius:2px}.input-area{position:fixed;bottom:0;left:0;right:0;padding:12px 16px;padding-bottom:calc(12px + var(--safe-bottom));background:var(--bg-primary);border-top:1px solid 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