*,:before,:after{box-sizing:border-box;margin:0;padding:0}:root{--color-accent:#7c3aed;--color-accent-light:#ede9fe;--color-accent-dark:#6d28d9;--color-bg:#f9fafb;--color-surface:#fff;--color-text:#1f2937;--color-text-secondary:#6b7280;--color-border:#e5e7eb;--color-user-bubble:#7c3aed;--color-user-text:#fff;--color-assistant-bubble:#f3f4f6;--color-error:#ef4444;--color-online:#10b981;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-xl:20px;--shadow-sm:0 1px 2px #0000000d;--shadow-md:0 4px 6px #00000012;--font-stack:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif}html,body,#root{width:100%;height:100%}body{font-family:var(--font-stack);background:var(--color-bg);color:var(--color-text);-webkit-font-smoothing:antialiased;line-height:1.5}.app-loading,.app-error{height:100vh;color:var(--color-text-secondary);flex-direction:column;justify-content:center;align-items:center;gap:16px;display:flex}.app-error button{border-radius:var(--radius-sm);background:var(--color-accent);color:#fff;cursor:pointer;border:none;padding:8px 24px;font-size:14px}.spinner{border:3px solid var(--color-border);border-top-color:var(--color-accent);border-radius:50%;width:32px;height:32px;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.char-select{max-width:480px;min-height:100vh;margin:0 auto;padding:48px 20px 24px}.char-select-header{text-align:center;margin-bottom:36px}.char-select-header h1{color:var(--color-accent);margin-bottom:4px;font-size:28px;font-weight:700}.char-select-subtitle{color:var(--color-text-secondary);font-size:15px}.char-grid{grid-template-columns:1fr;gap:16px;display:grid}@media (width>=480px){.char-grid{grid-template-columns:1fr 1fr}}.char-card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);cursor:pointer;text-align:center;box-shadow:var(--shadow-sm);flex-direction:column;align-items:center;padding:28px 20px;transition:all .2s;display:flex}.char-card:hover{border-color:var(--color-accent);transform:translateY(-2px);box-shadow:0 4px 12px #7c3aed26}.char-card:active{transform:translateY(0)}.char-avatar{color:#fff;border-radius:50%;justify-content:center;align-items:center;width:64px;height:64px;margin-bottom:12px;font-size:24px;font-weight:600;display:flex}.char-name{margin-bottom:4px;font-size:18px;font-weight:600}.char-tagline{color:var(--color-text-secondary);font-size:13px}.chat-window{background:var(--color-surface);flex-direction:column;max-width:768px;height:100vh;margin:0 auto;display:flex;position:relative}.chat-header{border-bottom:1px solid var(--color-border);background:var(--color-surface);z-index:10;flex-shrink:0;align-items:center;gap:12px;padding:12px 16px;display:flex}.chat-back-btn{cursor:pointer;color:var(--color-text);border-radius:var(--radius-sm);background:0 0;border:none;padding:4px 8px;font-size:22px}.chat-back-btn:hover{background:var(--color-assistant-bubble)}.chat-header-info{align-items:center;gap:10px;display:flex}.chat-header-avatar{color:#fff;border-radius:50%;justify-content:center;align-items:center;width:36px;height:36px;font-size:14px;font-weight:600;display:flex}.chat-header-name{font-size:16px;font-weight:600}.chat-header-status{color:var(--color-online);align-items:center;gap:4px;font-size:12px;display:flex}.chat-header-status:before{content:"";background:var(--color-online);border-radius:50%;width:6px;height:6px;display:inline-block}.chat-messages{flex-direction:column;flex:1;gap:8px;padding:16px;display:flex;overflow-y:auto}.chat-messages::-webkit-scrollbar{width:4px}.chat-messages::-webkit-scrollbar-track{background:0 0}.chat-messages::-webkit-scrollbar-thumb{background:var(--color-border);border-radius:2px}.chat-empty{text-align:center;flex-direction:column;flex:1;justify-content:center;align-items:center;padding:40px 20px;display:flex}.chat-empty-avatar{color:#fff;border-radius:50%;justify-content:center;align-items:center;width:72px;height:72px;margin-bottom:16px;font-size:28px;font-weight:600;display:flex}.chat-empty-greeting{color:var(--color-text-secondary);max-width:280px;font-size:15px;line-height:1.6}.msg-row{gap:8px;max-width:80%;animation:.2s fadeIn;display:flex}@keyframes fadeIn{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}.msg-user{flex-direction:row-reverse;align-self:flex-end}.msg-assistant{align-self:flex-start}.msg-avatar{color:#fff;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:28px;height:28px;margin-top:4px;font-size:11px;font-weight:600;display:flex}.msg-bubble{border-radius:var(--radius-xl);word-wrap:break-word;white-space:pre-wrap;padding:10px 14px;font-size:14px;line-height:1.5}.msg-user .msg-bubble{background:var(--color-user-bubble);color:var(--color-user-text);border-bottom-right-radius:4px}.msg-assistant .msg-bubble{background:var(--color-assistant-bubble);color:var(--color-text);border-bottom-left-radius:4px}.msg-typing{align-items:center;gap:3px;padding:4px 0;display:inline-flex}.typing-dot{background:var(--color-text-secondary);border-radius:50%;width:6px;height:6px;animation:1.4s ease-in-out infinite typingBounce}.typing-dot:first-child{animation-delay:0s}.typing-dot:nth-child(2){animation-delay:.2s}.typing-dot:nth-child(3){animation-delay:.4s}@keyframes typingBounce{0%,60%,to{opacity:.4;transform:translateY(0)}30%{opacity:1;transform:translateY(-4px)}}.chat-error-banner{border-radius:var(--radius-sm);color:var(--color-error);background:#fef2f2;border:1px solid #fecaca;justify-content:space-between;align-items:center;padding:10px 14px;font-size:13px;display:flex}.chat-error-banner button{border:1px solid var(--color-error);border-radius:var(--radius-sm);color:var(--color-error);cursor:pointer;white-space:nowrap;background:#fff;padding:4px 12px;font-size:12px}.chat-error-banner button:hover{background:var(--color-error);color:#fff}.input-area{border-top:1px solid var(--color-border);background:var(--color-surface);flex-shrink:0;padding:12px 16px}.streaming-indicator{align-items:center;gap:3px;padding:0 0 8px;display:flex}.streaming-dot{background:var(--color-accent);border-radius:50%;width:5px;height:5px;animation:1.4s ease-in-out infinite typingBounce}.streaming-dot:first-child{animation-delay:0s}.streaming-dot:nth-child(2){animation-delay:.2s}.streaming-dot:nth-child(3){animation-delay:.4s}.streaming-text{color:var(--color-text-secondary);margin-left:4px;font-size:11px}.input-row{align-items:flex-end;gap:8px;display:flex}.input-field{border:1px solid var(--color-border);border-radius:var(--radius-md);font-family:var(--font-stack);resize:none;background:var(--color-bg);outline:none;flex:1;max-height:120px;padding:10px 14px;font-size:14px;line-height:1.5;transition:border-color .2s}.input-field:focus{border-color:var(--color-accent)}.input-field:disabled{opacity:.6;cursor:not-allowed}.input-send{background:var(--color-accent);color:#fff;border-radius:var(--radius-md);cursor:pointer;white-space:nowrap;border:none;height:fit-content;padding:10px 20px;font-size:14px;font-weight:500;transition:background .2s}.input-send:hover:not(:disabled){background:var(--color-accent-dark)}.input-send:disabled{opacity:.5;cursor:not-allowed}.chat-error-state{height:100vh;color:var(--color-text-secondary);flex-direction:column;justify-content:center;align-items:center;gap:12px;display:flex}.chat-error-state button{border-radius:var(--radius-sm);background:var(--color-accent);color:#fff;cursor:pointer;border:none;padding:8px 24px;font-size:14px}@media (width>=768px){.chat-window{border-radius:var(--radius-lg);height:calc(100vh - 40px);box-shadow:0 0 0 1px var(--color-border), var(--shadow-md);margin:20px auto}.char-select{padding-top:80px}}@media (width<=767px){.chat-window{border-radius:0}}