:root {
    --global-font-size: 16px;
    --font-stack: 'Courier New', Courier, monospace;
    --background-color: #f4f1ea; 
    --page-main-color: #222222;
    --btn-bg: transparent;
    --border-color: #222222;
    /* 明亮模式懸停：黑底白字 */
    --hover-bg: #222222;
    --hover-text: #ffffff;
}

body.dark-mode {
    --background-color: #1a1a1a;
    --page-main-color: #00ff00; 
    --btn-bg: #000000;
    --border-color: #00ff00;
    /* 深色模式懸停：綠底黑字 */
    --hover-bg: #00ff00;
    --hover-text: #000000;
}

body {
    background-color: var(--background-color);
    color: var(--page-main-color);
    font-family: var(--font-stack);
    transition: background 0.3s, color 0.3s;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 10px 20px;
}

.main-logo {
    font-size: 2.2rem !important;
    font-weight: bold !important;
    color: #000000 !important;
    text-decoration: none;
}

body.dark-mode .main-logo {
    color: #00ff00 !important;
}

.full-hr {
    border-top: 2px dashed var(--border-color);
    width: 100vw;
    position: relative;
    left: 50%;
    right: 50%;
    margin-left: -50vw;
    margin-right: -50vw;
    margin-bottom: 30px;
    margin-top: -5px;
}

/* 懸停效果：根據主題變數切換 */
.hover-effect:hover {
    background-color: var(--hover-bg) !important;
    color: var(--hover-text) !important;
    border-color: var(--hover-bg) !important;
}

.terminal-button, button, .menu-item, .logo, h1, h2, h3, p, .terminal-alert {
    font-family: var(--font-stack) !important;
    text-transform: uppercase;
    color: var(--page-main-color) !important;
}

.terminal-button, button {
    background-color: var(--btn-bg) !important;
    border: 1px solid var(--border-color) !important;
    cursor: pointer;
    padding: 10px;
}

textarea {
    width: 100%;
    background-color: rgba(0,0,0,0.05);
    color: var(--page-main-color);
    border: 2px solid var(--border-color) !important;
    font-family: var(--font-stack);
    padding: 15px;
    outline: none;
    display: block !important;
}

body.dark-mode textarea {
    background-color: #000;
}

.button-group {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 15px;
    margin-top: 20px;
}