/* ===== English Learning Website - Common Styles ===== */

/* Base Layout */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f4f7f6;
    margin: 20px;
}

.container {
    max-width: 1200px;
    margin: auto;
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
}

/* Headings */
h1 {
    color: #2c3e50;
    text-align: center;
    border-bottom: 2px solid #3498db;
    padding-bottom: 10px;
}

h2 {
    color: #e67e22;
    border-left: 5px solid #e67e22;
    padding-left: 10px;
    margin-top: 15px;
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
    table-layout: fixed;
}

th, td {
    border: 1px solid #ddd;
    padding: 8px;
    text-align: left;
    word-wrap: break-word;
}

th {
    background-color: #3498db;
    color: white;
    position: sticky;
    top: 0;
}

tr:nth-child(even) {
    background-color: #f9f9f9;
}

tr:hover {
    background-color: #f1f1f1;
}

/* Vocabulary Cell Styles */
.word {
    font-weight: bold;
    color: #2980b9;
    font-size: 1.1em;
}

.ipa {
    color: #7f8c8d;
    font-style: italic;
}

.inflection {
    color: #c0392b;
    font-size: 0.9em;
    font-weight: bold;
}

.meaning {
    color: #27ae60;
    font-weight: 500;
}

.example {
    font-size: 0.85em;
    color: #555;
    background: #fffbe6;
    padding: 5px;
    border-radius: 3px;
    display: block;
    margin-bottom: 2px;
}

.example-cn {
    color: #888;
    font-size: 0.9em;
    display: block;
    margin-bottom: 5px;
}

.tag {
    display: inline-block;
    background: #eee;
    padding: 2px 5px;
    border-radius: 3px;
    font-size: 0.8em;
    margin-right: 5px;
}

/* ---- Control Panel (Self-test Toggle) ---- */
.control-panel {
    position: sticky;
    top: 10px;
    background: #ffffff;
    padding: 12px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
    margin: 20px auto;
    max-width: 800px;
    z-index: 1000;
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-toggle {
    background-color: #3498db;
    color: white;
    border: none;
    padding: 8px 16px;
    font-size: 0.9em;
    font-weight: bold;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-toggle:hover {
    background-color: #2980b9;
}

.btn-toggle.active {
    background-color: #e67e22;
}

.btn-toggle.active:hover {
    background-color: #d35400;
}

/* Navigation button (gray) */
.btn-nav {
    background-color: #95a5a6 !important;
}

.btn-nav:hover {
    background-color: #7f8c8d !important;
}

/* ---- Hide Toggle CSS Rules ---- */
.hide-words th:nth-child(1),
.hide-words td:nth-child(1) {
    display: none;
}

.hide-inflections th:nth-child(2),
.hide-inflections td:nth-child(2) {
    display: none;
}

.hide-meanings th:nth-child(3),
.hide-meanings td:nth-child(3) {
    display: none;
}

.hide-translations .example-cn {
    display: none;
}

/* 4. 隐藏整个例句列 */
.hide-examples th:nth-child(4),
.hide-examples td:nth-child(4) {
    display: none;
}

/* ---- TTS Clickable Style ---- */
.tts-clickable {
    cursor: pointer;
    text-decoration: underline;
    text-decoration-style: dotted;
    text-decoration-color: #3498db;
    text-underline-offset: 2px;
}

.tts-clickable:hover {
    color: #e67e22;
    text-decoration-color: #e67e22;
}

/* ---- Offline Mode (Service Worker) ---- */
body.offline::after {
    content: '📵 离线模式';
    position: fixed;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 99999;
    background: #e74c3c;
    color: #fff;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.85em;
    font-weight: bold;
    box-shadow: 0 2px 10px rgba(231, 76, 60, 0.4);
    pointer-events: none;
}