/* Base styles */
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 20px;
    background-color: #f0f0f0;
    touch-action: pan-y pinch-zoom;
}

#app {
    max-width: 800px;
    margin: 0 auto;
    background-color: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

/* Navigation space for drill mode */
#navSpace {
    margin-bottom: 15px;
    background-color: white;
}

/* Override back-to-topics-container styling in navSpace */
#navSpace .back-to-topics-container {
    margin-top: 0;
    padding-top: 0;
    border-top: none;
}

/* Selector space for drill mode */
#selectorSpace {
    margin-top: 15px;
    background-color: white;
    position: sticky;
    bottom: 20px;
    z-index: 10;
}

/* Selector container layout */
.selector-container {
    display: flex;
    flex-direction: column;
    gap: 10px;
    align-items: center;
}

/* Letter selector container */
.letter-selector-container {
    width: 100%;
    display: flex;
    justify-content: center;
}

/* Number selector container */
.number-selector-container {
    width: 100%;
    display: flex;
    justify-content: center;
}

/* Update letter and number selectors for new container */
#selectorSpace .letter-selector,
#selectorSpace .number-selector {
    margin: 0;
    max-width: 100%;
    background-color: #f8f9fa;
    border-radius: 8px;
    padding: 10px;
}

/* Card styles */
.card {
    border: 1px solid #ddd;
    border-radius: 8px;
    margin-bottom: 15px;
    padding: 15px;
    background-color: white;
}

.card-content {
    margin-bottom: 10px;
}

.card-label {
    margin-bottom: 10px;
}

.card-description {
    color: #666;
    line-height: 1.5;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

/* Card label parts */
.label-main {
    font-size: 1.4em;
    font-weight: bold;
    color: #333;
    display: inline;
}

.label-sub {
    font-size: 1.1em;
    color: #0066cc;
    font-weight: normal;
    margin-left: 8px;
    display: inline;
}

/* Mode buttons */
.mode-buttons {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.mode-button {
    padding: 8px 24px;
    border: none;
    border-radius: 6px;
    background-color: #007bff;
    color: white;
    cursor: pointer;
    transition: background-color 0.2s;
    font-size: 16px;
}

.mode-button:hover:not(:disabled) {
    background-color: #0056b3;
}

.mode-button:disabled {
    background-color: #ccc;
    cursor: not-allowed;
}

.mode-button.active {
    background-color: #28a745;
}

/* Mode containers */
.mode-container {
    display: none;
}

.mode-container.active {
    display: block;
}

/* Back to Topics button */
.back-to-topics-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid #eee;
}

.back-to-topics-container .center-buttons {
    display: flex;
    gap: 10px;
}

.back-to-topics-button {
    padding: 10px 20px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.2s;
}

.back-to-topics-button:hover {
    background-color: #0056b3;
}

/* Topic selector container */
.topic-selector-container {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
}

/* Search box */
.search-box {
    flex: 1;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

/* Topic selector */
.topic-selector {
    flex: 2;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

/* Letter selector */
.letter-selector {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 10px;
    margin: 5px auto;
    max-width: 600px;
    position: relative;
    background-color: #f8f9fa;
    border-radius: 8px;
}

.letter-row {
    display: flex;
    justify-content: center;
    position: relative;
    margin-bottom: 5px;
}

/* Position rows for interlocking - default for large screens */
.letter-row:nth-child(2) {
    margin-top: -17px;
    margin-left: 1px;
}

.letter-row:nth-child(3) {
    margin-top: -17px;
}

.letter-row:nth-child(4) {
    margin-top: -17px;
}

.letter-button {
    width: 60px;
    height: 60px;
    border: 2px solid #0056b3;
    background-color: #007bff;
    color: white;
    font-size: 24px;
    cursor: pointer;
    transition: transform 0.2s, background-color 0.2s, box-shadow 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
    margin: 0 -2px;
    padding: 0;
    position: relative;
    box-shadow: 
        inset -2px -2px 4px rgba(0, 0, 0, 0.2),
        inset 2px 2px 4px rgba(255, 255, 255, 0.2),
        0 4px 8px rgba(0, 0, 0, 0.15);
}

.letter-button:hover {
    background-color: #0056b3;
    transform: scale(1.1);
    z-index: 2;
    box-shadow: 
        inset -2px -2px 4px rgba(0, 0, 0, 0.3),
        inset 2px 2px 4px rgba(255, 255, 255, 0.3),
        0 6px 12px rgba(0, 0, 0, 0.2);
}

/* Number selector */
.number-selector {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 10px;
    margin: 5px auto;
    max-width: 600px;
    position: relative;
    background-color: #f8f9fa;
    border-radius: 8px;
}

.number-row {
    display: flex;
    justify-content: center;
    position: relative;
    margin-bottom: 5px;
}

/* Position rows for interlocking */
.number-row:nth-child(2) {
    margin-top: -12px;
}

.number-button {
    width: 60px;
    height: 60px;
    border: 2px solid #0056b3;
    background-color: #007bff;
    color: white;
    font-size: 24px;
    cursor: pointer;
    transition: transform 0.2s, background-color 0.2s, box-shadow 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
    margin: 0 -1px;
    padding: 0;
    position: relative;
    box-shadow: 
        inset -2px -2px 4px rgba(0, 0, 0, 0.2),
        inset 2px 2px 4px rgba(255, 255, 255, 0.2),
        0 4px 8px rgba(0, 0, 0, 0.15);
}

.number-button:hover {
    background-color: #0056b3;
    transform: scale(1.1);
    z-index: 2;
    box-shadow: 
        inset -2px -2px 4px rgba(0, 0, 0, 0.3),
        inset 2px 2px 4px rgba(255, 255, 255, 0.3),
        0 6px 12px rgba(0, 0, 0, 0.2);
}

/* Responsive styles for small screens */
@media (max-width: 767px) {
    /* Update selector space for mobile */
    #selectorSpace {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        margin: 0;
        border-radius: 8px 8px 0 0;
        box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
    }
    
    .selector-container {
        gap: 5px;
    }
    
    #selectorSpace .letter-selector,
    #selectorSpace .number-selector {
        padding: 5px;
    }
    
    .letter-button {
        width: 50px;
        height: 50px;
        font-size: 20px;
        border-width: 1px;
        margin: 0 0px !important;
    }

    .number-button {
        width: 50px;
        height: 50px;
        font-size: 20px;
        border-width: 1px;
        margin: 0 0px !important;
    }

    .letter-row, .number-row {
        margin: 0 !important;
        justify-content: center;
    }

    .letter-row:nth-child(1) {
        margin: 0 0 0 0 !important;
    }

    .letter-row:nth-child(2),
    .letter-row:nth-child(3),
    .letter-row:nth-child(4) {
        margin: -11px 0 0 0 !important;
    }

    .number-row:nth-child(1) {
        margin: 0 0 0 0 !important;
    }

    .number-row:nth-child(2) {
        margin: -11px 0 0 0 !important;
    }

    .letter-selector, .number-selector {
        padding: 0;
        margin: 0 auto;
    }
    
    .topic-selector-container {
        flex-direction: row;
        flex-wrap: nowrap;
        justify-content: space-between;
        align-items: center;
        gap: 10px;
    }
    
    .search-box {
        width: 40%;
        margin-bottom: 0;
    }
    
    .topic-selector {
        width: 60%;
        margin-bottom: 0;
        font-size: 14px;
        padding: 6px;
    }
    
    .mode-buttons {
        display: flex;
        flex-wrap: nowrap;
        justify-content: center;
        gap: 5px;
    }
    
    .mode-button {
        padding: 8px 12px;
        margin: 0;
        min-width: 70px;
        font-size: 14px;
    }
    
    .back-to-topics-container {
        justify-content: space-between;
    }
    
    .back-to-topics-container .center-buttons {
        gap: 6px;
    }
    
    .back-to-topics-button {
        padding: 8px 12px;
        font-size: 13px;
    }
}

/* Answer box */
.answer-box {
    font-size: 24px;
    padding: 15px;
    margin: 15px 0;
    border: 2px solid #ddd;
    border-radius: 8px;
    min-height: 40px;
    background-color: #f8f9fa;
    text-align: center;
    letter-spacing: 2px;
    position: relative;
}

.answer-box.error {
    background-color: #ffdddd;
    border-color: #ff6b6b;
    animation: shake 0.5s;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
    20%, 40%, 60%, 80% { transform: translateX(5px); }
}

.cursor {
    display: inline-block;
    width: 2px;
    height: 24px;
    background-color: #333;
    margin-left: 2px;
    animation: blink 1s infinite;
    vertical-align: middle;
}

@keyframes blink {
    0%, 49% { opacity: 1; }
    50%, 100% { opacity: 0; }
}

.answer-display {
    font-size: 24px;
    padding: 15px;
    margin: 15px 0;
    text-align: center;
    font-weight: bold;
    color: #28a745;
}

/* List display for completed answers */
.list-display {
    font-size: 18px;
    padding: 5px 15px;
    margin: 10px 0 0 0;
    background-color: #f8f9fa;
    border-radius: 8px;
    line-height: 1.6;
    height: 200px;
    overflow-y: auto;
    scroll-behavior: smooth;
}

.list-item {
    padding: 3px 10px;
    margin: 1px 0;
    border-radius: 4px;
}

.list-item:first-child {
    margin-top: 0;
}

.list-item:last-child {
    margin-bottom: 0;
}

.list-item.highlight {
    background-color: #fff3cd;
    font-weight: bold;
    color: #856404;
    border: 2px solid #ffc107;
}

.card-answer {
    margin-top: 20px;
    padding: 15px;
    border-top: 1px solid #eee;
}

.completed-answer {
    opacity: 1;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.prev-next-buttons {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid #eee;
}

.prev-button, .next-button {
    padding: 10px 16px;
    background-color: #007bff;
    color: white;
    border: none;
    cursor: pointer;
    font-size: 20px;
    transition: background-color 0.2s;
}

.prev-button {
    border-radius: 8px 4px 4px 8px;
}

.next-button {
    border-radius: 4px 8px 8px 4px;
}

.prev-button:hover:not(:disabled), .next-button:hover:not(:disabled) {
    background-color: #0056b3;
}

.prev-button:disabled, .next-button:disabled {
    background-color: #cccccc;
    cursor: not-allowed;
}

.consecutive-correct {
    display: inline-block;
    margin: 0 20px;
    color: #7f8c8d;
    font-size: 16px;
}

/* Version display */
.version {
    position: fixed;
    bottom: 10px;
    right: 10px;
    font-size: 12px;
    color: #666;
}