:root{color-scheme:dark;--bg:#0b1220;--panel:#121a2b;--panel-soft:#182235;--text:#ecf3ff;--muted:#9fb0cc;--border:hsla(0,0%,100%,.08);--accent:#2563eb;--accent-2:#3b82f6;--danger:#ef4444}*{box-sizing:border-box}body,html{margin:0;min-height:100%;background:linear-gradient(180deg,#0b1220,#0f172a);color:var(--text);font-family:Inter,Arial,Helvetica,sans-serif}button,input,textarea{font:inherit}.page{min-height:100vh;display:flex;justify-content:center;align-items:center;padding:24px}.chat-card{width:min(100%,960px);min-height:88vh;display:grid;grid-template-rows:auto 1fr auto;background:rgba(18,26,43,.96);border:1px solid var(--border);border-radius:24px;overflow:hidden;box-shadow:0 24px 64px rgba(0,0,0,.35)}.chat-header{padding:22px 24px;border-bottom:1px solid var(--border)}.header-row{justify-content:space-between;gap:16px}.brand-left,.header-row{display:flex;align-items:center}.brand-left{gap:14px}.brand-logo-wrap{width:60px;height:60px;padding:4px;border-radius:18px;background:hsla(0,0%,100%,.04);border:1px solid var(--border)}.brand-logo{width:100%;height:100%;object-fit:cover;border-radius:14px}.chat-title{margin:0;font-size:28px}.chat-subtitle{margin:6px 0 0;color:var(--muted);line-height:1.5}.status-pill{display:inline-flex;align-items:center;gap:8px;padding:10px 14px;border-radius:999px;border:1px solid rgba(59,130,246,.25);background:rgba(37,99,235,.12);color:#cfe1ff;font-size:14px}.status-dot{width:8px;height:8px;border-radius:50%;background:#60a5fa}.messages{padding:24px;overflow-y:auto;display:flex;flex-direction:column;gap:14px}.welcome-card{margin:auto;width:min(100%,680px);padding:28px;border-radius:20px;background:hsla(0,0%,100%,.03);border:1px solid var(--border)}.welcome-card h2{margin:0 0 12px;font-size:32px}.welcome-card p{margin:0;color:var(--muted);line-height:1.7}.starter-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));grid-gap:12px;gap:12px;margin-top:22px}.starter-button{text-align:left;padding:16px;border:1px solid rgba(59,130,246,.18);background:rgba(37,99,235,.08);color:var(--text);border-radius:16px;cursor:pointer;transition:.18s ease}.starter-button:hover:not(:disabled){background:rgba(37,99,235,.14);transform:translateY(-1px)}.message-row{display:flex}.message-row.user{justify-content:flex-end}.message-bubble{max-width:min(80%,720px);padding:14px 16px;border-radius:18px;border:1px solid var(--border);line-height:1.7;white-space:pre-wrap;word-break:break-word}.message-row.user .message-bubble{background:linear-gradient(180deg,var(--accent-2),var(--accent))}.message-row.assistant .message-bubble{background:var(--panel-soft)}.typing-bubble{min-width:72px}.typing{display:inline-flex;gap:6px;align-items:center}.typing span{width:8px;height:8px;border-radius:50%;background:#93c5fd;animation:blink 1.2s ease-in-out infinite}.typing span:nth-child(2){animation-delay:.2s}.typing span:nth-child(3){animation-delay:.4s}.attachment-strip,.message-attachments{display:grid;grid-gap:10px;gap:10px;margin-top:12px}.message-attachments{grid-template-columns:repeat(auto-fit,minmax(180px,1fr))}.attachment-chip,.message-attachment-card{display:grid;grid-gap:8px;gap:8px;padding:10px 12px;border-radius:14px;border:1px solid hsla(0,0%,100%,.08);background:hsla(0,0%,100%,.04)}.attachment-chip strong,.message-attachment-card strong{display:block;font-size:13px}.attachment-chip span,.message-attachment-card span{color:var(--muted);font-size:12px}.message-attachment-preview{width:100%;height:120px;object-fit:cover;border-radius:12px}.file-badge{display:inline-flex;width:-moz-fit-content;width:fit-content;padding:6px 10px;border-radius:999px;background:hsla(0,0%,100%,.06);color:var(--muted);font-size:12px}.composer{padding:20px 24px 24px;border-top:1px solid var(--border)}.composer-form{grid-template-columns:1fr auto}.composer-form,.composer-main{display:grid;grid-gap:12px;gap:12px}.composer-main{padding:14px;border-radius:18px;border:1px solid var(--border);background:hsla(0,0%,100%,.02)}.composer-main.drag-active{border-color:rgba(59,130,246,.35);box-shadow:0 0 0 3px rgba(37,99,235,.12)}.composer-toolbar{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}.toolbar-hint{color:var(--muted);font-size:13px}.hidden-input{display:none}.composer-textarea{width:100%;min-height:72px;max-height:220px;resize:vertical;border-radius:14px;border:1px solid var(--border);background:hsla(0,0%,100%,.03);color:var(--text);padding:14px 16px;outline:none}.composer-textarea:focus{border-color:rgba(59,130,246,.35)}.composer-actions{display:flex;flex-direction:column;gap:10px}.attachment-remove,.primary-button,.secondary-button{border:none;border-radius:14px;cursor:pointer}.primary-button,.secondary-button{padding:14px 18px}.primary-button{min-width:128px;color:#fff;background:linear-gradient(180deg,var(--accent-2),var(--accent))}.secondary-button{color:var(--text);background:hsla(0,0%,100%,.05);border:1px solid var(--border)}.secondary-button.danger{color:#fecaca;background:rgba(239,68,68,.08);border-color:rgba(239,68,68,.22)}.attachment-chip{grid-template-columns:1fr auto;align-items:center}.attachment-remove{width:28px;height:28px;background:rgba(239,68,68,.12);color:#fecaca}.error-box{margin-top:12px;color:#fecaca;background:rgba(239,68,68,.08);border:1px solid rgba(239,68,68,.2);border-radius:14px;padding:12px 14px}@keyframes blink{0%,80%,to{opacity:.3;transform:translateY(0)}40%{opacity:1;transform:translateY(-2px)}}@media (max-width:768px){.page{padding:0}.chat-card{width:100%;min-height:100vh;border-radius:0}.composer-form,.header-row{display:grid;grid-template-columns:1fr}.composer-actions{display:grid;grid-template-columns:1fr 1fr}.message-bubble{max-width:92%}}