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

:root {
--primary-color: #007AFF;
--secondary-color: #5856D6;
--background: #F5F5F7;
--surface: #FFFFFF;
--text-primary: #1D1D1F;
--text-secondary: #86868B;
--border-color: #D2D2D7;
--shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
--shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.12);
--radius: 18px;
--radius-small: 12px;
}

body {
font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, sans-serif;
background: var(--background);
color: var(--text-primary);
line-height: 1.6;
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
}

.container {
max-width: 900px;
margin: 0 auto;
padding: 20px;
min-height: 100vh;
display: flex;
flex-direction: column;
}

/* Header */
.header {
text-align: center;
padding: 40px 20px 30px;
display: flex;
flex-direction: column;
align-items: center;
gap: 15px;
}

.header-content {
display: flex;
flex-direction: column;
gap: 8px;
}

.title {
font-size: 48px;
font-weight: 700;
letter-spacing: -0.5px;
}

.gradient-text {
background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
-webkit-background-clip: text;
-webkit-text-fill-color: transparent;
background-clip: text;
}

.subtitle {
font-size: 16px;
color: var(--text-secondary);
font-weight: 400;
}

.built-with {
display: inline-flex;
align-items: center;
gap: 6px;
padding: 8px 16px;
background: rgba(0, 122, 255, 0.1);
color: var(--primary-color);
text-decoration: none;
border-radius: 20px;
font-size: 14px;
font-weight: 500;
transition: all 0.3s ease;
}

.built-with:hover {
background: rgba(0, 122, 255, 0.15);
transform: translateY(-2px);
}

/* Model Status */
.model-status {
background: var(--surface);
border-radius: var(--radius);
padding: 20px;
margin-bottom: 20px;
box-shadow: var(--shadow);
}

.status-content {
display: flex;
align-items: center;
gap: 12px;
margin-bottom: 12px;
}

.loader {
width: 20px;
height: 20px;
border: 3px solid var(--border-color);
border-top-color: var(--primary-color);
border-radius: 50%;
animation: spin 1s linear infinite;
}

@keyframes spin {
to { transform: rotate(360deg); }
}

.model-status.ready .loader {
display: none;
}

.model-status.ready .status-content::before {
content: "✓";
width: 20px;
height: 20px;
background: #34C759;
color: white;
border-radius: 50%;
display: flex;
align-items: center;
justify-content: center;
font-size: 14px;
font-weight: 700;
}

#statusText {
font-size: 14px;
font-weight: 500;
color: var(--text-primary);
}

.progress-bar {
width: 100%;
height: 4px;
background: var(--border-color);
border-radius: 2px;
overflow: hidden;
}

.progress-fill {
height: 100%;
background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
width: 0%;
transition: width 0.3s ease;
}

.model-status.ready .progress-bar {
display: none;
}

/* Chat Container */
.chat-container {
flex: 1;
background: var(--surface);
border-radius: var(--radius);
box-shadow: var(--shadow);
display: flex;
flex-direction: column;
overflow: hidden;
}

.chat-messages {
flex: 1;
overflow-y: auto;
padding: 30px;
display: flex;
flex-direction: column;
gap: 20px;
}

.chat-messages::-webkit-scrollbar {
width: 8px;
}

.chat-messages::-webkit-scrollbar-track {
background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb {
background: var(--border-color);
border-radius: 4px;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
background: var(--text-secondary);
}

/* Welcome Message */
.welcome-message {
text-align: center;
padding: 60px 20px;
color: var(--text-secondary);
}

.welcome-icon {
font-size: 64px;
margin-bottom: 20px;
}

.welcome-message h2 {
font-size: 28px;
font-weight: 600;
color: var(--text-primary);
margin-bottom: 12px;
}

.welcome-message p {
font-size: 16px;
max-width: 400px;
margin: 0 auto;
}

/* Message Bubbles */
.message {
display: flex;
gap: 12px;
animation: slideIn 0.3s ease;
}

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

.message.user {
flex-direction: row-reverse;
}

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

.message.user .message-avatar {
background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

.message.assistant .message-avatar {
background: var(--border-color);
}

.message-content {
max-width: 70%;
padding: 14px 18px;
border-radius: var(--radius-small);
font-size: 15px;
line-height: 1.5;
}

.message.user .message-content {
background: var(--primary-color);
color: white;
border-bottom-right-radius: 4px;
}

.message.assistant .message-content {
background: var(--background);
color: var(--text-primary);
border-bottom-left-radius: 4px;
}

.message-content p {
margin: 0 0 8px 0;
}

.message-content p:last-child {
margin-bottom: 0;
}

.message-content code {
background: rgba(0, 0, 0, 0.1);
padding: 2px 6px;
border-radius: 4px;
font-family: 'SF Mono', Monaco, monospace;
font-size: 13px;
}

.message.user .message-content code {
background: rgba(255, 255, 255, 0.2);
}

.typing-indicator {
display: flex;
gap: 4px;
padding: 14px 18px;
}

.typing-dot {
width: 8px;
height: 8px;
background: var(--text-secondary);
border-radius: 50%;
animation: typing 1.4s infinite;
}

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

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

@keyframes typing {
0%, 60%, 100% {
transform: translateY(0);
opacity: 0.7;
}
30% {
transform: translateY(-10px);
opacity: 1;
}
}

/* Input Area */
.input-container {
padding: 20px;
border-top: 1px solid var(--border-color);
background: var(--surface);
}

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

.user-input {
flex: 1;
padding: 14px 18px;
border: 2px solid var(--border-color);
border-radius: var(--radius-small);
font-size: 15px;
font-family: inherit;
resize: none;
max-height: 120px;
transition: all 0.3s ease;
background: var(--background);
}

.user-input:focus {
outline: none;
border-color: var(--primary-color);
background: var(--surface);
}

.user-input:disabled {
opacity: 0.5;
cursor: not-allowed;
}

.send-button {
width: 48px;
height: 48px;
border: none;
border-radius: 50%;
background: var(--primary-color);
color: white;
cursor: pointer;
display: flex;
align-items: center;
justify-content: center;
transition: all 0.3s ease;
flex-shrink: 0;
}

.send-button:hover:not(:disabled) {
background: var(--secondary-color);
transform: scale(1.05);
}

.send-button:active:not(:disabled) {
transform: scale(0.95);
}

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

.input-hint {
margin-top: 8px;
font-size: 12px;
color: var(--text-secondary);
text-align: center;
}

/* Responsive */
@media (max-width: 768px) {
.container {
padding: 10px;
}

.header {
padding: 20px 10px 15px;
}

.title {
font-size: 36px;
}

.chat-messages {
padding: 20px 15px;
}

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

.welcome-message {
padding: 40px 15px;
}

.welcome-icon {
font-size: 48px;
}

.welcome-message h2 {
font-size: 24px;
}
}