/* Global Reset & Base Styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: #121212;
    color: #e0e0e0;
    line-height: 1.6;
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

/* Typography */
h1,
h2,
h3 {
    margin-bottom: 0.5em;
    font-weight: 600;
}

a {
    color: #4fc3f7;
    text-decoration: none;
    transition: color 0.3s;
}

a:hover {
    color: #81d4fa;
}

/* Layout Containers */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    width: 100%;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.center-content {
    justify-content: center;
    align-items: center;
    text-align: center;
}

/* Header */
header {
    background: #1e1e1e;
    padding: 1rem 2rem;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: #ffffff;
}

/* Cards & Glassmorphism */
.card {
    background: rgba(30, 30, 30, 0.8);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 2rem;
    margin: 1rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 12px rgba(0, 0, 0, 0.4);
}

.btn {
    display: inline-block;
    background: linear-gradient(135deg, #1e88e5 0%, #1565c0 100%);
    color: white;
    padding: 12px 24px;
    border-radius: 25px;
    border: none;
    font-size: 1rem;
    cursor: pointer;
    transition: filter 0.3s, transform 0.1s;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.btn:hover {
    filter: brightness(1.2);
}

.btn:active {
    transform: scale(0.98);
}

.btn-secondary {
    background: linear-gradient(135deg, #424242 0%, #303030 100%);
}

.btn-level {
    width: 80px;
    padding: 8px 0;
    margin: 0 5px;
    font-size: 0.9rem;
}

/* Level Colors (matching Python app) */
.level-0 {
    background-color: #D32F2F !important;
    color: white !important;
}

.level-1 {
    background-color: #FF9800 !important;
    color: black !important;
}

.level-2 {
    background-color: #FBC02D !important;
    color: black !important;
}

.level-3 {
    background-color: #8BC34A !important;
    color: black !important;
}

.level-4 {
    background-color: #2196F3 !important;
    color: white !important;
}

/* Visual Table */
.card-grid {
    display: grid;
    grid-template-columns: repeat(18, 1fr);
    grid-template-rows: repeat(7, 1fr);
    /* Standard 7 periods */
    gap: 4px;
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
    overflow-x: auto;
}

.card-cell {
    aspect-ratio: 1 / 1;
    background: #333;
    border: 1px solid #555;
    border-radius: 4px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    font-weight: bold;
    position: relative;
    transition: transform 0.1s;
    user-select: none;
    min-width: 40px;
}

.card-cell:hover {
    transform: scale(1.1);
    z-index: 10;
    border-color: #fff;
}

.card-term {
    font-size: 1.2rem;
    opacity: 0;
    /* Hidden by default */
    transition: opacity 0.2s;
}

.card-no {
    font-size: 0.7rem;
    position: absolute;
    top: 2px;
    left: 4px;
    color: #eee;
    /* Changed from #aaa for better visibility against colors if shown */
    opacity: 0;
    /* Hidden by default */
    transition: opacity 0.2s;
}

.card-cell:hover .card-term,
.card-cell:hover .card-no {
    opacity: 1;
    /* Show on hover */
}


.empty-cell {
    pointer-events: none;
}

/* Context Menu */
#context-menu {
    display: none;
    position: absolute;
    z-index: 1000;
    background: #2c2c2c;
    border: 1px solid #555;
    box-shadow: 2px 2px 5px rgba(0, 0, 0, 0.5);
    border-radius: 4px;
    padding: 5px 0;
}

#context-menu .menu-item {
    padding: 8px 20px;
    cursor: pointer;
    color: #eee;
}

#context-menu .menu-item:hover {
    background: #444;
}

/* Info Panel for Table */
.info-panel {
    background: #1e1e1e;
    padding: 15px;
    text-align: center;
    border-top: 1px solid #333;
    position: sticky;
    bottom: 0;
    width: 100%;
    z-index: 100;
}

.info-text-large {
    font-size: 1.5rem;
    margin-bottom: 5px;
}

.info-text-small {
    font-size: 1.1rem;
    color: #aaa;
}

.settings-panel {
    background: #2c2c2c;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    width: 100%;
    max-width: 600px;
    display: none;
    /* Toggled via JS */
}

.settings-panel.active {
    display: block;
}

.checkbox-group {
    display: flex;
    gap: 15px;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.checkbox-label {
    display: flex;
    align-items: center;
    cursor: pointer;
}

/* Utility */
.hidden {
    display: none !important;
}

/* Modal Styles */
.modal {
    display: none;
    /* Hidden by default */
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
}

.modal.active {
    display: flex;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background-color: #2c2c2c;
    margin: auto;
    padding: 2.5rem;
    border: 1px solid #555;
    border-radius: 12px;
    width: 90%;
    max-width: 600px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
    position: relative;
    max-height: 90vh;
    overflow-y: auto;
}

.close-btn {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    position: absolute;
    top: 10px;
    right: 20px;
    cursor: pointer;
}

.close-btn:hover,
.close-btn:focus {
    color: #fff;
    text-decoration: none;
    cursor: pointer;
}

.data-section {
    margin-bottom: 1rem;
}

.data-section h3 {
    margin-bottom: 0.5rem;
    color: #4fc3f7;
}

.desc {
    font-size: 0.9rem;
    color: #bbb;
    margin-bottom: 0.5rem;
}

textarea {
    width: 100%;
    height: 100px;
    background-color: #1e1e1e;
    color: #e0e0e0;
    border: 1px solid #444;
    border-radius: 4px;
    padding: 10px;
    font-family: monospace;
    resize: vertical;
    margin-bottom: 10px;
}

textarea:focus {
    outline: none;
    border-color: #2196F3;
}

/* Quiz Typography Override */
.hanzi-text {
    font-size: 4rem;
    /* Specific request for larger Hanzi */
    font-family: "Microsoft JhengHei", "Noto Sans TC", sans-serif;
    margin: 10px 0;
    line-height: 1.2;
}

.sub-text {
    font-size: 1.5rem;
    color: #aaa;
    margin-bottom: 10px;
}

/* ============================================================
   長文対応版 追加スタイル
   ============================================================ */

/* ヒント表示用スタイル */
.hint-text {
    font-size: 1rem;
    color: #888;
    font-style: italic;
    margin-bottom: 8px;
    padding: 8px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 4px;
}

/* 長文対応フォントサイズ */
.long-text {
    font-size: 1.5rem;
    line-height: 1.5;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

/* 横長タイル形式 (table.html用) */
.horizontal-tile {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 12px 16px;
    background: #333;
    border: 1px solid #555;
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
}

.horizontal-tile:hover {
    background: #444;
    transform: translateX(4px);
}

.tile-front {
    flex: 2;
    font-size: 1rem;
    font-weight: 600;
    color: #fff;
    word-wrap: break-word;
}

.tile-hint {
    flex: 2;
    font-size: 0.85rem;
    color: #888;
    font-style: italic;
    word-wrap: break-word;
}

.tile-back {
    flex: 1;
    font-size: 1rem;
    color: #4fc3f7;
    font-weight: bold;
    text-align: center;
}

.tile-level {
    width: 50px;
    font-size: 0.75rem;
    color: #666;
    text-align: right;
}

/* Editable Table Styles */
.edit-table-container {
    overflow: auto;
    /* Handle both X and Y */
    width: 100%;
    margin-top: 10px;
    max-height: 500px;
    /* Constrain height to force scrollbars to appear on container */
    border: 1px solid #444;
    /* Optional visual boundary */
}

.edit-table {
    width: 100%;
    border-collapse: collapse;
    min-width: 800px;
}

.edit-table th,
.edit-table td {
    border: 1px solid #444;
    padding: 8px;
    text-align: left;
    vertical-align: top;
}

.edit-table th {
    background-color: #333;
    font-weight: bold;
    color: #eee;
    position: sticky;
    top: 0;
    z-index: 10;
    /* Ensure header stays on top */
}

.edit-table input,
.edit-table select {
    width: 100%;
    background: #222;
    border: 1px solid #555;
    color: #e0e0e0;
    padding: 4px;
    border-radius: 4px;
}

.edit-table input:focus {
    border-color: #2196F3;
    outline: none;
}

.btn-small {
    padding: 4px 8px;
    font-size: 0.8rem;
    margin-right: 4px;
    border-radius: 4px;
    cursor: pointer;
    border: none;
}

.btn-save {
    background-color: #4caf50;
    color: white;
}

.btn-del {
    background-color: #f44336;
    color: white;
}