body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    margin: 0;
    padding: 0;
    background: #fff;
    color: #222;
}

.container {
    max-width: 700px;
    margin: 0 auto;
    padding: 24px 12px 0 12px;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.header {
    margin-bottom: 18px;
}

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

.header-buttons {
    margin-bottom: 8px;
}

.header-buttons a {
    margin-right: 16px;
    color: #222;
    text-decoration: underline;
    font-size: 1em;
}

.messages-container {
    flex: 1;
    margin-bottom: 18px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.message {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.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;
}

.form-container {
    margin-top: 12px;
    padding-top: 12px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

input[type="text"], textarea {
    width: 100%;
    font-size: 1em;
    padding: 6px;
    margin-bottom: 4px;
    border: 1px solid #ccc;
    box-sizing: border-box;
}

button {
    width: fit-content;
    font-size: 1em;
    padding: 6px 16px;
    background: #fff;
    color: #222;
    border: 1px solid #ccc;
    cursor: pointer;
}

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

.api-info pre {
    font-family: monospace;
    font-size: 1em;
    background: #f8f8f8;
    padding: 10px;
    margin: 0;
    border: 1px solid #eee;
    overflow-x: auto;
}

.modal-content {
    background: #fff;
    padding: 18px;
    max-width: 600px;
    margin: 40px auto;
}

.close {
    font-size: 1.5em;
    cursor: pointer;
    color: #888;
}