/* CSS Variables for Light/Dark Mode */
:root {
    --bg-color: #ffffff;
    --text-color: #333333;
    --section-bg: #f9f9f9;
    --border-color: #dddddd;
    --input-bg: #ffffff;
    --input-border: #cccccc;
    --muted-text: #666666;
    --timestamp-text: #999999;
    --description-text: #666666;
}

/* Dark mode variables */
html[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --text-color: #e0e0e0;
    --section-bg: #2d2d2d;
    --border-color: #444444;
    --input-bg: #2d2d2d;
    --input-border: #555555;
    --muted-text: #aaaaaa;
    --timestamp-text: #888888;
    --description-text: #aaaaaa;
}

/* Base Layout */
body {
    font-family: Arial, sans-serif;
    max-width: 700px;
    margin: 50px auto;
    padding: 20px;
    line-height: 1.6;
    background-color: var(--bg-color);
    color: var(--text-color);
}

/* Typography */
h1 {
    color: var(--text-color);
    text-align: center;
    margin-bottom: 30px;
}

h3 {
    color: var(--text-color);
    margin-top: 0;
}

p {
    color: var(--text-color);
}

/* Buttons */
button {
    font-size: 16px;
    padding: 10px 20px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    margin-right: 10px;
}

button:hover {
    background-color: #0056b3;
}

button:disabled {
    background-color: #6c757d;
    cursor: not-allowed;
}

/* Large button variant for special cases */
.btn-large {
    font-size: 18px;
    padding: 12px 24px;
}

/* Sections */
.section {
    margin: 30px 0;
    padding: 20px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--section-bg);
}

/* Feature List (for index page) */
.feature-list {
    list-style: none;
    padding: 0;
}

.feature-list li {
    margin: 15px 0;
    padding: 15px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--section-bg);
}

.feature-list a {
    text-decoration: none;
    color: #007bff;
    font-weight: bold;
    font-size: 18px;
}

.feature-list a:hover {
    text-decoration: underline;
}

.description {
    color: var(--description-text);
    margin-top: 8px;
    font-size: 14px;
}

/* Response Fields */
.response-field {
    min-height: 50px;
    padding: 15px;
    border: 2px solid var(--input-border);
    border-radius: 4px;
    background-color: var(--input-bg);
    color: var(--text-color);
    margin: 15px 0;
    font-size: 16px;
    word-wrap: break-word;
}

/* Special display for large numbers */
.display-large {
    font-size: 48px;
    font-weight: bold;
    color: var(--text-color);
    margin: 30px 0;
    padding: 20px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--section-bg);
    text-align: center;
}

/* Centered response fields */
.response-field.centered {
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Forms */
.form-group {
    margin: 15px 0;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

input[type="text"] {
    width: 100%;
    padding: 10px;
    border: 2px solid var(--input-border);
    border-radius: 4px;
    font-size: 16px;
    box-sizing: border-box;
    background-color: var(--input-bg);
    color: var(--text-color);
}

/* Status Classes */
.loading {
    color: var(--muted-text);
    font-style: italic;
}

.response {
    color: #007bff;
    font-weight: bold;
}

.response.large {
    font-size: 18px;
}

.error {
    color: #dc3545;
}

/* Navigation */
.back-link {
    margin-top: 30px;
    text-align: center;
}

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

.back-link a:hover {
    text-decoration: underline;
}

/* Utility Classes */
.info {
    color: var(--muted-text);
    font-size: 14px;
    margin-top: 10px;
}

.timestamp {
    color: var(--timestamp-text);
    font-size: 12px;
    margin-top: 5px;
}

.text-center {
    text-align: center;
}

/* Items Management Styles */
.container {
    max-width: 800px;
    margin: 0 auto;
}

.items-container {
    min-height: 100px;
}

.item-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 15px;
    margin: 8px 0;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: var(--input-bg);
}

.item-name {
    flex-grow: 1;
    font-size: 16px;
    color: var(--text-color);
}

.item-id {
    color: var(--muted-text);
    font-size: 14px;
    margin-right: 15px;
}

.delete-btn {
    background-color: #dc3545;
    padding: 6px 12px;
    font-size: 14px;
    margin: 0;
}

.delete-btn:hover {
    background-color: #c82333;
}

.form-group {
    display: flex;
    gap: 10px;
    align-items: center;
}

.form-group input[type="text"] {
    flex-grow: 1;
    width: auto;
}

.empty {
    color: var(--muted-text);
    font-style: italic;
    text-align: center;
    padding: 20px;
}

.back-button {
    color: var(--muted-text);
    text-decoration: none;
    font-size: 16px;
}

/* Dark Mode Toggle */
.dark-mode-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    background-color: var(--section-bg);
    border: 2px solid var(--border-color);
    border-radius: 25px;
    padding: 8px 16px;
    cursor: pointer;
    font-size: 16px;
    color: var(--text-color);
    transition: all 0.3s ease;
    z-index: 1000;
}

.dark-mode-toggle:hover {
    background-color: var(--border-color);
}

.back-button:hover {
    text-decoration: underline;
}