* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; background: #f5f5f5; color: #333; }
header { display: flex; justify-content: space-between; align-items: center; padding: 12px 24px; background: #1a1a2e; color: #fff; }
header h1 { font-size: 18px; font-weight: 600; }
header nav { display: flex; align-items: center; gap: 12px; }
header button { background: transparent; border: 1px solid #fff; color: #fff; padding: 4px 12px; border-radius: 4px; cursor: pointer; }
main { max-width: 960px; margin: 24px auto; padding: 0 16px; }
.hidden { display: none !important; }

/* Login */
.login-container { max-width: 360px; margin: 80px auto; background: #fff; padding: 32px; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.login-container h2 { margin-bottom: 20px; }
.login-container input { width: 100%; padding: 10px; margin-bottom: 12px; border: 1px solid #ddd; border-radius: 4px; font-size: 14px; }
.login-container button { width: 100%; padding: 10px; background: #1a1a2e; color: #fff; border: none; border-radius: 4px; cursor: pointer; font-size: 14px; }
.login-container .error { color: #e74c3c; font-size: 13px; margin-bottom: 8px; }

/* Cards */
.card { background: #fff; border-radius: 8px; padding: 20px; margin-bottom: 16px; box-shadow: 0 1px 4px rgba(0,0,0,0.08); }
.card h3 { margin-bottom: 8px; }
.card p { color: #666; font-size: 14px; }
.card .meta { font-size: 12px; color: #999; margin-top: 8px; }
.card:hover { box-shadow: 0 2px 8px rgba(0,0,0,0.12); cursor: pointer; }

/* Buttons */
.btn { padding: 8px 16px; border-radius: 4px; border: none; cursor: pointer; font-size: 14px; }
.btn-primary { background: #1a1a2e; color: #fff; }
.btn-secondary { background: #e0e0e0; color: #333; }
.btn-small { padding: 4px 10px; font-size: 12px; }
.actions { display: flex; gap: 8px; margin-bottom: 16px; }

/* Breadcrumb */
.breadcrumb { font-size: 13px; color: #666; margin-bottom: 16px; }
.breadcrumb a { color: #1a1a2e; text-decoration: none; }

/* Artifact editor */
.editor-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.editor-panel textarea { width: 100%; min-height: 400px; padding: 12px; border: 1px solid #ddd; border-radius: 4px; font-family: 'SF Mono', 'Fira Code', monospace; font-size: 13px; line-height: 1.6; resize: vertical; }
.editor-panel .toolbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.editor-panel .version { font-size: 12px; color: #999; }

/* Chat panel */
.chat-panel { background: #fff; border-radius: 8px; box-shadow: 0 1px 4px rgba(0,0,0,0.08); display: flex; flex-direction: column; height: 520px; }
.chat-panel .chat-header { padding: 12px 16px; border-bottom: 1px solid #eee; font-weight: 600; font-size: 14px; }
.chat-messages { flex: 1; overflow-y: auto; padding: 12px 16px; }
.chat-msg { margin-bottom: 12px; }
.chat-msg.user { text-align: right; }
.chat-msg .bubble { display: inline-block; max-width: 85%; padding: 8px 12px; border-radius: 12px; font-size: 13px; line-height: 1.5; }
.chat-msg.user .bubble { background: #1a1a2e; color: #fff; }
.chat-msg.assistant .bubble { background: #f0f0f0; color: #333; text-align: left; }
.chat-input { display: flex; gap: 8px; padding: 12px; border-top: 1px solid #eee; }
.chat-input input { flex: 1; padding: 8px; border: 1px solid #ddd; border-radius: 4px; font-size: 13px; }
.chat-input button { padding: 8px 16px; }

/* Artifact list */
.artifact-item { display: flex; justify-content: space-between; align-items: center; padding: 12px 16px; border-bottom: 1px solid #f0f0f0; }
.artifact-item:last-child { border-bottom: none; }
.artifact-item:hover { background: #fafafa; cursor: pointer; }
.artifact-item .label { font-weight: 500; }
.artifact-item .info { font-size: 12px; color: #999; }
.badge { display: inline-block; padding: 2px 8px; border-radius: 10px; font-size: 11px; background: #e8e8e8; }
.badge.planning { background: #fff3cd; color: #856404; }
.badge.development { background: #d4edda; color: #155724; }

/* Create project form */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 13px; font-weight: 500; margin-bottom: 4px; }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 8px; border: 1px solid #ddd; border-radius: 4px; font-size: 14px; }