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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    background: #0f0f0f;
    color: #ececec;
    height: 100vh;
    display: flex;
    flex-direction: column;
}

.chat-container {
    background: #212121;
    flex: 1;
    display: flex;
    flex-direction: column;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
}

.chat-header {
    background: #0f0f0f;
    border-bottom: 1px solid #333;
    padding: 16px 20px;
    position: relative;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1000px;
    margin: 0 auto;
}

.logo {
    font-size: 18px;
    font-weight: 600;
    color: #fff;
    display: flex;
    align-items: center;
    gap: 8px;
}

.encryption-badge {
    background: #10a37f;
    color: white;
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
}

.room-section {
    background: #2d2d2d;
    padding: 20px;
    margin: 20px;
    border-radius: 12px;
    border: 1px solid #404040;
}

.room-input-container {
    display: flex;
    gap: 12px;
    align-items: center;
    margin-top: 16px;
}

.room-input {
    flex: 1;
    background: #0f0f0f;
    border: 1px solid #404040;
    color: #ececec;
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 14px;
    outline: none;
    transition: border-color 0.2s;
}

.room-input:focus {
    border-color: #10a37f;
    box-shadow: 0 0 0 2px rgba(16, 163, 127, 0.1);
}

.btn {
    background: #10a37f;
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    font-size: 14px;
    transition: all 0.2s;
    white-space: nowrap;
}

.btn:hover {
    background: #0d8c6a;
}

.btn-secondary {
    background: #2d2d2d;
    border: 1px solid #404040;
}

.btn-secondary:hover {
    background: #3d3d3d;
}

.status-text {
    color: #b4b4b4;
    font-size: 14px;
    margin-top: 12px;
}

.room-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: #2d2d2d;
    border-radius: 8px;
    font-size: 13px;
    color: #b4b4b4;
    margin-bottom: 16px;
}

.room-details {
    display: flex;
    gap: 20px;
}

.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    background: #212121;
    max-width: 1000px;
    margin: 0 auto;
    width: 100%;
}

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

.messages-container::-webkit-scrollbar-track {
    background: #2d2d2d;
}

.messages-container::-webkit-scrollbar-thumb {
    background: #404040;
    border-radius: 4px;
}


.message-group {
    margin-bottom: 24px;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.message-group.sent {
    align-items: flex-end;
}

.message-group.received {
    align-items: flex-start;
}

.message-header {
    display: flex;
    align-items: center;
    margin-bottom: 8px;
    gap: 8px;
}

.user-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: linear-gradient(45deg, #10a37f, #0d8c6a);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: bold;
    color: white;
}

.user-avatar.own {
    background: linear-gradient(45deg, #6366f1, #8b5cf6);
}

.user-name {
    font-weight: 600;
    font-size: 14px;
    color: #ececec;
}

.message-time {
    color: #888;
    font-size: 12px;
    margin-left: auto;
}


.message-content {
    background: #2d2d2d;
    padding: 12px 16px;
    border-radius: 12px;
    margin-left: 36px;
    border: 1px solid #404040;
    line-height: 1.5;
    word-wrap: break-word;
    max-width: 70%;
    text-align: left;
}

.message-group.sent .message-content {
    background: #0f0f0f;
    border-color: #333;
    margin-left: 0;
    margin-right: 36px;
    text-align: right;
    align-self: flex-end;
}

.message-group.received .message-content {
    align-self: flex-start;
}

.input-section {
    background: #0f0f0f;
    padding: 20px;
    border-top: 1px solid #333;
}

.input-container {
    max-width: 1000px;
    margin: 0 auto;
    position: relative;
}

.message-input {
    width: 100%;
    background: #2d2d2d;
    border: 1px solid #404040;
    color: #ececec;
    padding: 16px 60px 16px 20px;
    border-radius: 12px;
    font-size: 16px;
    outline: none;
    resize: none;
    min-height: 24px;
    max-height: 200px;
    font-family: inherit;
    line-height: 1.5;
    transition: border-color 0.2s;
}

.message-input:focus {
    border-color: #10a37f;
    box-shadow: 0 0 0 2px rgba(16, 163, 127, 0.1);
}

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

.send-button {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    background: #10a37f;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    color: white;
}

.send-button:hover:not(:disabled) {
    background: #0d8c6a;
}

.send-button:disabled {
    background: #404040;
    cursor: not-allowed;
}

.welcome-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex: 1;
    text-align: center;
    padding: 40px 20px;
}

.welcome-title {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 16px;
    background: linear-gradient(45deg, #10a37f, #6366f1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.welcome-subtitle {
    font-size: 18px;
    color: #b4b4b4;
    margin-bottom: 32px;
    max-width: 600px;
}

.feature-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 32px;
    max-width: 800px;
}

.feature-item {
    background: #2d2d2d;
    padding: 20px;
    border-radius: 12px;
    border: 1px solid #404040;
}

.feature-icon {
    font-size: 24px;
    margin-bottom: 12px;
}

.feature-title {
    font-weight: 600;
    margin-bottom: 8px;
    color: #ececec;
}

.feature-desc {
    color: #b4b4b4;
    font-size: 14px;
    line-height: 1.4;
}

.loading-message {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #b4b4b4;
    font-size: 14px;
}

.loading-spinner {
    width: 16px;
    height: 16px;
    border: 2px solid #404040;
    border-top: 2px solid #10a37f;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.error-message {
    background: #dc2626;
    color: white;
    padding: 12px 16px;
    border-radius: 8px;
    margin: 16px 0;
    font-size: 14px;
}

.typing-indicator {
    color: #888;
    font-style: italic;
    font-size: 13px;
    padding: 8px 20px;
}

@media (max-width: 768px) {
    .chat-container {
        height: 100vh;
    }
    
    .header-content {
        padding: 0 4px;
    }
    
    .room-input-container {
        flex-direction: column;
        gap: 8px;
    }
    
    .room-input, .btn {
        width: 100%;
    }
    
    .room-details {
        flex-direction: column;
        gap: 8px;
    }
    
    .message-content {
        margin-left: 0;
        margin-top: 8px;
    }

    .feature-list {
        grid-template-columns: 1fr;
    }
}