/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #10a37f;
    --primary-hover: #0d8a6a;
    --bg-main: #ffffff;
    --bg-secondary: #f7f7f8;
    --bg-user: #f7f7f8;
    --bg-bot: #ffffff;
    --text-primary: #2d2d2d;
    --text-secondary: #6e6e80;
    --border-color: #e5e5e5;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.15);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
        'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
        sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    overflow: hidden;
}

/* Chat Container */
.chat-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    max-width: 900px;
    margin: 0 auto;
    background-color: var(--bg-main);
}

/* Header */
.chat-header {
    background-color: var(--bg-main);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 24px;
    box-shadow: var(--shadow);
    z-index: 10;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo h1 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-secondary);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: #ffa500;
    animation: pulse 2s infinite;
}

.status-dot.online {
    background-color: var(--primary-color);
}

.status-dot.offline {
    background-color: #dc3545;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Messages Container */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    scroll-behavior: smooth;
}

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

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

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

.messages-container::-webkit-scrollbar-thumb:hover {
    background: #c0c0c0;
}

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

.welcome-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.welcome-message h2 {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.welcome-message p {
    font-size: 16px;
}

/* Message Bubbles */
.message {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
    animation: messageSlide 0.3s ease-out;
}

@keyframes messageSlide {
    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-weight: 600;
    font-size: 14px;
    flex-shrink: 0;
}

.message.user .message-avatar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.message.bot .message-avatar {
    background: linear-gradient(135deg, #10a37f 0%, #0d8a6a 100%);
    color: white;
}

.message-content {
    max-width: 70%;
    padding: 12px 16px;
    border-radius: 12px;
    line-height: 1.6;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.message.user .message-content {
    background-color: var(--bg-user);
    color: var(--text-primary);
}

.message.bot .message-content {
    background-color: var(--bg-bot);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.message-time {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* Input Container */
.input-container {
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-main);
    padding: 16px 24px;
}

.input-wrapper {
    display: flex;
    gap: 12px;
    align-items: flex-end;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 8px 12px;
    transition: border-color 0.2s;
}

.input-wrapper:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(16, 163, 127, 0.1);
}

#messageInput {
    flex: 1;
    border: none;
    background: transparent;
    resize: none;
    outline: none;
    font-family: inherit;
    font-size: 15px;
    line-height: 1.5;
    max-height: 200px;
    overflow-y: auto;
}

#messageInput::-webkit-scrollbar {
    width: 6px;
}

#messageInput::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.send-button {
    width: 36px;
    height: 36px;
    border: none;
    background-color: var(--primary-color);
    color: white;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    flex-shrink: 0;
}

.send-button:hover:not(:disabled) {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.send-button:active:not(:disabled) {
    transform: translateY(0);
}

.send-button:disabled {
    background-color: var(--border-color);
    cursor: not-allowed;
    opacity: 0.5;
}

.input-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 8px;
    font-size: 12px;
    color: var(--text-secondary);
}

.char-count {
    font-weight: 500;
}

.hint {
    font-style: italic;
}

/* Loading Indicator */
.loading-indicator {
    display: none;
    justify-content: center;
    padding: 8px;
}

.loading-indicator.show {
    display: flex;
}

.loading-dots {
    display: flex;
    gap: 6px;
}

.loading-dots span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--primary-color);
    animation: bounce 1.4s infinite ease-in-out both;
}

.loading-dots span:nth-child(1) {
    animation-delay: -0.32s;
}

.loading-dots span:nth-child(2) {
    animation-delay: -0.16s;
}

@keyframes bounce {
    0%, 80%, 100% {
        transform: scale(0);
    }
    40% {
        transform: scale(1);
    }
}

/* Error Message */
.error-message {
    background-color: #fee;
    border: 1px solid #fcc;
    color: #c33;
    padding: 12px 16px;
    border-radius: 8px;
    margin: 16px 0;
    text-align: center;
}

/* Responsive Design */
@media (max-width: 768px) {
    .chat-header {
        padding: 12px 16px;
    }

    .messages-container {
        padding: 16px;
    }

    .input-container {
        padding: 12px 16px;
    }

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

    .hint {
        display: none;
    }

    .logo h1 {
        font-size: 18px;
    }
}

@media (max-width: 480px) {
    .status-indicator span {
        display: none;
    }

    .char-count {
        font-size: 11px;
    }
}