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

:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #8b5cf6;
    --bg-color: #0f172a;
    --surface-color: #1e293b;
    --surface-light: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --border-color: #475569;
    --success-color: #10b981;
    --shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: var(--text-primary);
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background: var(--bg-color);
    border-radius: 20px;
    box-shadow: var(--shadow);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    height: calc(100vh - 40px);
}

.header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    padding: 30px;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.header h1 {
    font-size: 2rem;
    margin-bottom: 8px;
    font-weight: 700;
}

.subtitle {
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.95rem;
    margin-bottom: 20px;
}

.status-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
    margin-top: 15px;
    font-size: 0.85rem;
}

.online-users {
    background: rgba(255, 255, 255, 0.2);
    padding: 6px 12px;
    border-radius: 20px;
    backdrop-filter: blur(10px);
}

.anonymous-id {
    background: rgba(255, 255, 255, 0.15);
    padding: 6px 12px;
    border-radius: 20px;
    font-family: 'Courier New', monospace;
    backdrop-filter: blur(10px);
}

.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    background: var(--bg-color);
}

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

.messages::-webkit-scrollbar-track {
    background: var(--surface-color);
    border-radius: 10px;
}

.messages::-webkit-scrollbar-thumb {
    background: var(--surface-light);
    border-radius: 10px;
}

.messages::-webkit-scrollbar-thumb:hover {
    background: var(--border-color);
}

.welcome-message {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-secondary);
}

.welcome-message p {
    margin-bottom: 10px;
}

.small-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.message {
    margin-bottom: 15px;
    animation: slideIn 0.3s ease-out;
}

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

.message-content {
    background: var(--surface-color);
    padding: 12px 16px;
    border-radius: 12px;
    border-left: 3px solid var(--primary-color);
    word-wrap: break-word;
    line-height: 1.5;
}

.message-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 6px;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.message-time {
    font-family: 'Courier New', monospace;
}

.message-id {
    font-family: 'Courier New', monospace;
    color: var(--primary-color);
}

.message-own {
    text-align: right;
}

.message-own .message-content {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-left: none;
    border-right: 3px solid var(--primary-dark);
    margin-left: auto;
    max-width: 80%;
}

.input-area {
    padding: 20px;
    background: var(--surface-color);
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 10px;
    align-items: flex-end;
}

#messageInput {
    flex: 1;
    background: var(--bg-color);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 12px 16px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    resize: none;
    transition: all 0.3s ease;
}

#messageInput:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

#messageInput::placeholder {
    color: var(--text-secondary);
}

.send-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border: none;
    border-radius: 12px;
    padding: 12px 24px;
    color: white;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
    font-size: 0.95rem;
}

.send-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(99, 102, 241, 0.4);
}

.send-btn:active {
    transform: translateY(0);
}

.send-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.info-box {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    padding: 20px;
    background: var(--surface-color);
    border-top: 1px solid var(--border-color);
}

.info-item {
    flex: 1;
    min-width: 200px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    padding: 10px;
    background: var(--bg-color);
    border-radius: 8px;
}

.info-item strong {
    color: var(--text-primary);
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        height: 100vh;
        border-radius: 0;
    }
    
    body {
        padding: 0;
    }
    
    .header h1 {
        font-size: 1.5rem;
    }
    
    .status-bar {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .input-area {
        flex-direction: column;
    }
    
    .send-btn {
        width: 100%;
        justify-content: center;
    }
    
    .message-own .message-content {
        max-width: 90%;
    }
}