:root{--bg-color:#f8f5f2;--surface-color:#fff;--text-primary:#2d2424;--text-secondary:#5c5552;--accent-primary:#e07a5f;--accent-secondary:#f2cc8f;--accent-hover:#d0694d;--border-color:#e6e1dc;--message-user-bg:#e07a5f;--message-user-text:#fff;--message-ai-bg:#fff;--message-ai-text:#2d2424;--input-bg:#fff;--shadow-color:#2d242414}[data-theme=dark]{--bg-color:#121212;--surface-color:#1e1e1e;--text-primary:#e0e0e0;--text-secondary:#a0a0a0;--accent-primary:#e07a5f;--accent-secondary:#f2cc8f;--accent-hover:#f4d09c;--border-color:#333;--message-user-bg:#c95d43;--message-user-text:#fff;--message-ai-bg:#e5e5e5;--message-ai-text:#1a1a1a;--input-bg:#2c2c2c;--shadow-color:#0006}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-color);color:var(--text-primary);flex-direction:column;width:100%;height:100dvh;font-family:Inter,sans-serif;transition:background-color .3s,color .3s;display:flex;position:fixed;overflow:hidden}header{z-index:10;background:0 0;justify-content:space-between;align-items:center;padding:16px 24px;display:flex}.header-content{justify-content:space-between;align-items:center;gap:20px;width:100%;display:flex}.header-title{align-items:center;gap:12px;font-size:1.1rem;font-weight:600;display:flex}.header-actions{align-items:center;gap:12px;display:flex}.theme-switch{background:var(--surface-color);border:1px solid var(--border-color);cursor:pointer;width:40px;height:40px;color:var(--text-primary);border-radius:12px;justify-content:center;align-items:center;transition:all .3s;display:flex;position:relative;overflow:hidden}.theme-switch:hover{background:var(--bg-color);border-color:var(--accent-secondary)}.theme-icon{opacity:0;transition:all .5s cubic-bezier(.23,1,.32,1);position:absolute;transform:rotate(90deg)scale(0)}.theme-icon.active{opacity:1;transform:rotate(0)scale(1)}.header-icon-btn{background:var(--surface-color);border:1px solid 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