body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    margin: 0;
    padding: 0;
    background: #fff;
    color: #222;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 700px;
    margin: 0 auto;
    padding: 0;
    width: 100%;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    height: 100vh;
}

.header {
    padding: 12px;
    background: #fff;
    border-bottom: 1px solid #eee;
    flex-shrink: 0;
}

.header h1 {
    margin: 0 0 8px 0;
    font-size: 2.2em;
    font-weight: bold;
}

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

.header-buttons a {
    color: #222;
    text-decoration: underline;
    font-size: 1em;
}

.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-height: 0;
}

.messages-container {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding-bottom: 12px;
    min-height: 0;
}

.message {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: 12px;
    border-radius: 8px;
    background: #f8f9fa;
}

.username {
    font-weight: 600;
    margin-right: 8px;
}

.time {
    color: #888;
    font-size: 0.9em;
    margin-left: 8px;
}

.encrypted {
    color: #666;
    font-size: 0.9em;
    margin-left: 8px;
}

.signature {
    color: #666;
    font-size: 0.9em;
    margin-top: 2px;
}

.message-bar {
    background: #fff;
    padding: 12px;
    border-top: 1px solid #eee;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
    flex-shrink: 0;
}

.message-form {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.message-inputs {
    display: flex;
    gap: 8px;
}

.message-inputs input[type="text"] {
    width: 150px;
    flex-shrink: 0;
}

.message-inputs textarea {
    flex: 1;
    min-height: 40px;
    resize: none;
}

.message-options {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
}

.signature-input {
    flex: 1;
    min-height: 40px;
    resize: none;
}

input[type="text"], textarea {
    font-size: 1em;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    box-sizing: border-box;
}

button {
    font-size: 1em;
    padding: 8px 16px;
    background: #222;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

button:hover {
    background: #444;
}

.checkbox-wrapper {
    display: flex;
    align-items: center;
    gap: 6px;
}

.delete-btn {
    background: none;
    color: #dc3545;
    padding: 0;
    font-size: 0.9em;
}

.delete-btn:hover {
    background: none;
    text-decoration: underline;
}

.error {
    color: #dc3545;
    margin-bottom: 10px;
    padding: 8px;
    background: #fff;
    border-radius: 4px;
    border: 1px solid #dc3545;
}

.api-info, .api-info pre, .modal, .modal-content, .close { display: none !important; }

@media (max-width: 600px) {
    .message-inputs {
        flex-direction: column;
    }
    
    .message-inputs input[type="text"] {
        width: 100%;
    }
    
    .message-options {
        flex-direction: column;
        align-items: stretch;
    }
    
    .signature-input {
        width: 100%;
    }
    
    .header-buttons {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .container {
        padding: 0;
        height: 100dvh;
    }
    
    .message {
        padding: 8px;
        margin: 4px 0;
    }
    
    .chat-container {
        padding: 8px;
    }

    .header h1 {
        font-size: 1.8em;
    }

    button {
        width: 100%;
        padding: 12px;
        font-size: 1.1em;
    }

    input[type="text"], textarea {
        font-size: 16px;
        padding: 12px;
    }
}

@media (max-width: 400px) {
    .header h1 {
        font-size: 1.5em;
    }
    
    .message {
        font-size: 0.95em;
    }
}