style.css

* {
margin: 0;
padding: 0;
box-sizing: border-box;
}

body {
font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
min-height: 100vh;
display: flex;
align-items: center;
justify-content: center;
padding: 20px;
}

.app-container {
width: 100%;
max-width: 900px;
height: 90vh;
max-height: 800px;
background: rgba(255, 255, 255, 0.95);
backdrop-filter: blur(20px);
border-radius: 24px;
box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
display: flex;
flex-direction: column;
overflow: hidden;
}

.header {
background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
padding: 20px 24px;
border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.header-content {
display: flex;
justify-content: space-between;
align-items: center;
}

.app-info {
display: flex;
align-items: center;
gap: 16px;
}

.app-icon {
width: 48px;
height: 48px;
background: rgba(255, 255, 255, 0.2);
border-radius: 12px;
display: flex;
align-items: center;
justify-content: center;
}

.app-icon svg {
filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}

.app-info h1 {
color: white;
font-size: 24px;
font-weight: 600;
margin-bottom: 2px;
}

.subtitle {
color: rgba(255, 255, 255, 0.8);
font-size: 14px;
font-weight: 400;
}

.built-with {
color: rgba(255, 255, 255, 0.9);
text-decoration: none;
font-size: 12px;
padding: 8px 16px;
background: rgba(255, 255, 255, 0.1);
border-radius: 20px;
transition: all 0.3s ease;
}

.built-with:hover {
background: rgba(255, 255, 255, 0.2);
transform: translateY(-1px);
}

.chat-container {
flex: 1;
overflow-y: auto;
padding: 24px;
background: #f8f9fa;
}

.messages-container {
display: flex;
flex-direction: column;
gap: 16px;
}

.message {
display: flex;
gap: 12px;
animation: fadeIn 0.3s ease;
}

.message-avatar {
width: 36px;
height: 36px;
border-radius: 50%;
background: #e9ecef;
display: flex;
align-items: center;
justify-content: center;
font-size: 18px;
flex-shrink: 0;
}

.message-bubble {
flex: 1;
max-width: 70%;
padding: 12px 16px;
border-radius: 18px;
position: relative;
box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.message-bubble.user {
background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
color: white;
align-self: flex-end;
margin-left: auto;
}

.message-bubble.assistant {
background: white;
color: #333;
}

.message-bubble.system {
background: #fff3cd;
color: #856404;
border: 1px solid #ffeaa7;
}

.message-content {
font-size: 15px;
line-height: 1.5;
word-wrap: break-word;
}

.message-time {
font-size: 11px;
opacity: 0.7;
margin-top: 4px;
}

.typing-indicator {
animation: fadeIn 0.3s ease;
}

.typing-dots {
display: flex;
gap: 4px;
padding: 8px 0;
}

.typing-dots span {
width: 8px;
height: 8px;
background: #667eea;
border-radius: 50%;
animation: typing 1.4s infinite;
}

.typing-dots span:nth-child(2) {
animation-delay: 0.2s;
}

.typing-dots span:nth-child(3) {
animation-delay: 0.4s;
}

.input-container {
background: white;
border-top: 1px solid #e9ecef;
padding: 20px 24px;
}

.input-wrapper {
position: relative;
}

.input-group {
display: flex;
gap: 12px;
align-items: flex-end;
}

.message-input {
flex: 1;
border: 2px solid #e9ecef;
border-radius: 20px;
padding: 12px 20px;
font-size: 15px;
font-family: inherit;
resize: none;
outline: none;
transition: all 0.3s ease;
min-height: 44px;
max-height: 120px;
overflow-y: auto;
}

.message-input:focus {
border-color: #667eea;
box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.message-input:disabled {
background: #f8f9fa;
cursor: not-allowed;
}

.send-button {
width: 44px;
height: 44px;
border-radius: 50%;
background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
border: none;
color: white;
cursor: pointer;
display: flex;
align-items: center;
justify-content: center;
transition: all 0.3s ease;
box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.send-button:hover:not(:disabled) {
transform: translateY(-2px);
box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.send-button:disabled {
opacity: 0.5;
cursor: not-allowed;
}

.status-bar {
margin-top: 12px;
}

.status-text {
font-size: 12px;
color: #6c757d;
margin-bottom: 6px;
}

.progress-bar {
height: 3px;
background: #e9ecef;
border-radius: 10px;
overflow: hidden;
display: none;
}

.progress-fill {
height: 100%;
background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
border-radius: 10px;
transition: width 0.3s ease;
width: 0%;
}

.error-message {
animation: shake 0.5s ease;
}

.welcome-message {
text-align: center;
padding: 20px;
}

@keyframes fadeIn {
from {
opacity: 0;
transform: translateY(10px);
}
to {
opacity: 1;
transform: translateY(0);
}
}

@keyframes typing {
0%, 60%, 100% {
transform: translateY(0);
}
30% {
transform: translateY(-10px);
}
}

@keyframes shake {
0%, 100% { transform: translateX(0); }
10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
20%, 40%, 60%, 80% { transform: translateX(5px); }
}

@media (max-width: 640px) {
.app-container {
height: 100vh;
max-height: 100vh;
border-radius: 0;
}

.message-bubble {
max-width: 85%;
}

.header {
padding: 16px;
}

.app-info h1 {
font-size: 20px;
}

.built-with {
display: none;
}
}