:root {
    --bg-color: #ffffff;
    --text-color: #000000;
    --input-bg: #f5f5f5;
    --input-border: #dddddd;
    --button-bg: #2196F3;
    --button-color: #ffffff;
    --link-color: #2196F3;
    --error-color: #f44336;
    --success-color: #4CAF50;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #1a1a1a;
        --text-color: #ffffff;
        --input-bg: #2d2d2d;
        --input-border: #404040;
        --button-bg: #1976D2;
        --button-color: #ffffff;
        --link-color: #64B5F6;
        --error-color: #EF5350;
        --success-color: #66BB6A;
    }
}

body {
    font-family: Arial, sans-serif;
    max-width: 400px;
    margin: 20px auto;
    padding: 20px;
    background-color: var(--bg-color);
    color: var(--text-color);
}

.form-group {
    margin: 10px 0;
}

input, textarea {
    width: 100%;
    padding: 8px;
    margin: 5px 0;
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    color: var(--text-color);
    border-radius: 4px;
}

textarea {
    height: 100px;
    resize: vertical;
}

button {
    width: 100%;
    padding: 10px;
    background: var(--button-bg);
    color: var(--button-color);
    border: none;
    cursor: pointer;
    border-radius: 4px;
    font-size: 16px;
}

button:hover {
    opacity: 0.9;
}

.error {
    color: var(--error-color);
    margin: 10px 0;
    padding: 10px;
    border-radius: 4px;
    background-color: rgba(244, 67, 54, 0.1);
}

.success {
    color: var(--success-color);
    margin: 10px 0;
    padding: 10px;
    border-radius: 4px;
    background-color: rgba(76, 175, 80, 0.1);
}

a {
    color: var(--link-color);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.message {
    margin: 10px 0;
    padding: 10px;
    border-radius: 4px;
    background-color: var(--input-bg);
}

.message-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 5px;
    font-size: 0.9em;
    color: var(--text-color);
    opacity: 0.8;
}

.message-content {
    word-break: break-word;
}

.message-encrypted {
    font-style: italic;
    opacity: 0.8;
}

.message-signed {
    font-style: italic;
    opacity: 0.8;
}

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