:root{--mashu-primary: #7c3aed;--mashu-primary-hover: #6d28d9;--mashu-bg: #ffffff;--mashu-bg-muted: #f3f4f6;--mashu-bg-welcome: linear-gradient(135deg, #fdf2f8 0%, #ede9fe 50%, #f3e8ff 100%);--mashu-text: #111827;--mashu-text-muted: #6b7280;--mashu-border: #e5e7eb;--mashu-radius: 24px;--mashu-radius-sm: 12px}.mashu-chat-container{background:var(--mashu-bg-welcome);border-radius:var(--mashu-radius);overflow:hidden;display:flex;flex-direction:column;min-height:280px;transition:min-height .4s ease,max-height .4s ease,background .4s ease}.mashu-chat-container--expanded{background:var(--mashu-bg);border:1px solid var(--mashu-border);min-height:420px;max-height:560px}.mashu-chat-welcome{display:flex;align-items:center;gap:24px;padding:32px;animation:mashu-fade-in .3s ease}.mashu-chat-welcome__avatar{flex-shrink:0;width:200px;display:flex;align-items:center;justify-content:center}.mashu-chat-welcome__avatar-img{width:180px;height:auto;border-radius:16px;object-fit:cover}.mashu-chat-welcome__content{flex:1;min-width:0;display:flex;flex-direction:column;gap:12px}.mashu-chat-welcome__content>.mashu-chat-input{padding:0}.mashu-chat-welcome__greeting{display:flex;align-items:center;gap:8px;width:100%;background:var(--mashu-bg);border-radius:24px;padding:12px 20px;font-size:15px;color:var(--mashu-text);box-shadow:0 1px 4px #0000000a}.mashu-chat-welcome__greeting-icon{font-size:18px}@media(max-width:640px){.mashu-chat-welcome{flex-direction:column;padding:24px 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