@tailwind base;@tailwind components;@tailwind utilities;:root{--bg-primary:#ffffff;--bg-secondary:#f8f9fa;--text-primary:#1a1a1a;--text-secondary:#6b7280;--accent:#0969DA;--border:#e5e7eb}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;margin:0;background:var(--bg-primary);color:var(--text-primary)}.chat-container{max-width:800px;margin:0 auto;height:100vh;display:flex;flex-direction:column}.chat-header{padding:16px 24px;border-bottom:1px solid var(--border);display:flex;align-items:center;gap:12px}.chat-header h1{font-size:18px;font-weight:600;margin:0}.chat-messages{flex:1 1;overflow-y:auto;padding:24px;display:flex;flex-direction:column;gap:16px}.message{max-width:80%;padding:12px 16px;border-radius:12px;line-height:1.5;white-space:pre-wrap}.message.user{align-self:flex-end;background:var(--accent);color:white;border-bottom-right-radius:4px}.message.assistant{align-self:flex-start;background:var(--bg-secondary);border-bottom-left-radius:4px}.message .pdf-download{display:inline-flex;align-items:center;gap:8px;margin-top:8px;padding:8px 16px;background:var(--accent);color:white;border-radius:8px;text-decoration:none;font-size:14px}.chat-input-area{padding:16px 24px;border-top:1px solid var(--border);display:flex;gap:12px}.chat-input{flex:1 1;padding:12px 16px;border:1px solid var(--border);border-radius:8px;font-size:15px;outline:none;resize:none}.chat-input:focus{border-color:var(--accent)}.send-btn{padding:12px 24px;background:var(--accent);color:white;border:none;border-radius:8px;font-size:15px;cursor:pointer}.send-btn:disabled{opacity:.5;cursor:not-allowed}.upload-zone{padding:16px;border:2px dashed var(--border);border-radius:8px;text-align:center;color:var(--text-secondary);cursor:pointer;margin:0 24px 8px}.upload-zone.dragover{border-color:var(--accent);background:#f0f7ff}.thinking{color:var(--text-secondary);font-style:italic}