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

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

.chat-container {
    width: 100%;
    max-width: 450px;
    height: 600px;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Header */
.chat-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-content {
    display: flex;
    align-items: center;
    gap: 15px;
}

.avatar {
    width: 45px;
    height: 45px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.avatar svg {
    width: 28px;
    height: 28px;
}

.header-info h3 {
    font-size: 18px;
    margin-bottom: 4px;
}

.status {
    font-size: 12px;
    opacity: 0.9;
}

.status.online {
    color: #4ade80;
}

.close-btn {
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: white;
    width: 35px;
    height: 35px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s;
}

.close-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.close-btn svg {
    width: 20px;
    height: 20px;
}

/* Messages */
.chat-messages {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    background: #f8f9fa;
}

.chat-messages::-webkit-scrollbar {
    width: 6px;
}

.chat-messages::-webkit-scrollbar-thumb {
    background: #cbd5e0;
    border-radius: 3px;
}

.welcome-message {
    text-align: center;
    padding: 40px 20px;
    color: #64748b;
}

.welcome-message h4 {
    font-size: 20px;
    margin-bottom: 10px;
    color: #334155;
}

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

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

.message-content {
    display: inline-block;
    max-width: 75%;
    padding: 12px 16px;
    border-radius: 18px;
    word-wrap: break-word;
    line-height: 1.4;
}

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

.message.sent .message-content {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-bottom-right-radius: 4px;
}

.message.received .message-content {
    background: white;
    color: #1e293b;
    border-bottom-left-radius: 4px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.message-time {
    font-size: 11px;
    margin-top: 5px;
    opacity: 0.7;
}

.message.sent .message-time {
    text-align: right;
}

.message-files {
    margin-top: 8px;
}

.message-image-container {
    margin: 8px 0;
    max-width: 100%;
}

.message-image {
    max-width: 250px;
    max-height: 250px;
    border-radius: 12px;
    cursor: pointer;
    transition: transform 0.2s;
    display: block;
}

.message-image:hover {
    transform: scale(1.02);
}

.message.sent .message-image {
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.message.received .message-image {
    border: 2px solid #e2e8f0;
}

.file-link {
    display: inline-block;
    padding: 8px 12px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    color: white;
    text-decoration: none;
    font-size: 13px;
    margin-right: 5px;
    margin-bottom: 5px;
    transition: background 0.2s;
}

.file-link:hover {
    background: rgba(255, 255, 255, 0.3);
}

.file-link.received {
    background: #e2e8f0;
    color: #334155;
}

.file-link.received:hover {
    background: #cbd5e0;
}

/* Typing Indicator */
.typing-indicator {
    padding: 10px 20px;
    background: #f8f9fa;
}

.typing-indicator span {
    display: inline-block;
    width: 8px;
    height: 8px;
    margin-right: 4px;
    background: #94a3b8;
    border-radius: 50%;
    animation: typing 1.4s infinite;
}

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

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

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

/* File Preview */
.file-preview {
    padding: 10px 20px;
    background: #fff3cd;
    border-top: 1px solid #ffc107;
}

.preview-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 14px;
    color: #856404;
}

.preview-content button {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: #856404;
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Input */
.chat-input {
    padding: 15px 20px;
    background: white;
    border-top: 1px solid #e2e8f0;
    display: flex;
    gap: 10px;
    align-items: center;
}

.attach-btn,
.send-btn {
    background: none;
    border: none;
    color: #667eea;
    cursor: pointer;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s;
}

.attach-btn:hover,
.send-btn:hover {
    background: #f1f5f9;
}

.attach-btn svg,
.send-btn svg {
    width: 24px;
    height: 24px;
}

#messageInput {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid #e2e8f0;
    border-radius: 24px;
    font-size: 14px;
    outline: none;
    transition: border-color 0.3s;
}

#messageInput:focus {
    border-color: #667eea;
}

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

.send-btn:hover {
    transform: scale(1.05);
    background: linear-gradient(135deg, #5568d3 0%, #65408b 100%);
}

/* Chat Toggle Button */
.chat-toggle {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    border-radius: 50%;
    color: white;
    cursor: pointer;
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.5);
    display: none;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s;
}

.chat-toggle:hover {
    transform: scale(1.1);
}

.chat-toggle svg {
    width: 30px;
    height: 30px;
}

/* Responsive */
@media (max-width: 768px) {
    .chat-container {
        max-width: 100%;
        height: 100vh;
        border-radius: 0;
    }
}

/* Loading More Indicator */
.loading-more {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 15px;
    color: #667eea;
    font-size: 14px;
    background: #f8f9ff;
    border-radius: 8px;
    margin: 10px;
}

.spinner {
    width: 16px;
    height: 16px;
    border: 2px solid #e0e0e0;
    border-top-color: #667eea;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Media Modal */
.media-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.95);
    z-index: 10000;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease-out;
}

.modal-content {
    max-width: 90%;
    max-height: 90%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 30px;
    font-size: 40px;
    color: white;
    background: none;
    border: none;
    cursor: pointer;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background 0.3s;
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.1);
}