/* learning.css */
.learning-settings {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
    align-items: center;
    background: var(--bg-primary);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
}

.setting-group {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.setting-label {
    font-weight: 700;
    color: var(--text-secondary);
}

.setting-radio {
    display: flex;
    gap: var(--space-md);
}

.setting-radio label {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    cursor: pointer;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-full);
    transition: all 0.3s ease;
    border: 2px solid var(--border-color);
}

.setting-radio label:hover {
    border-color: var(--primary);
    background: rgba(255, 107, 53, 0.05);
}

.setting-radio input[type="radio"] {
    width: auto;
    accent-color: var(--primary);
}

.pronunciation-selector {
    display: flex;
    gap: var(--space-md);
    align-items: center;
    margin: var(--space-md) 0;
}

.pronunciation-option {
    padding: var(--space-md) var(--space-lg);
    border: 3px solid var(--border-color);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.pronunciation-option:hover {
    border-color: var(--primary);
    background: rgba(255, 107, 53, 0.05);
}

.pronunciation-option.active {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

.spelling-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin: var(--space-lg) 0;
}

.spelling-display {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: 4px;
    background: linear-gradient(135deg, var(--bg-primary), var(--bg-secondary));
    padding: var(--space-lg) var(--space-2xl);
    border-radius: var(--radius-lg);
    min-width: 350px;
    text-align: center;
    margin: var(--space-lg) 0;
    border: 3px solid var(--primary-light);
    box-shadow: var(--shadow-md);
    color: var(--text-primary);
}

.letter-tiles {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-md);
    margin: var(--space-lg) 0;
    max-width: 550px;
}

.letter-tile {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 800;
    border-radius: var(--radius-md);
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: none;
}

.letter-tile:hover {
    transform: translateY(-4px) scale(1.1);
    background: linear-gradient(135deg, var(--secondary), var(--secondary-dark));
    box-shadow: var(--shadow-lg);
}

.letter-tile:active {
    transform: scale(0.95);
}

.spelling-result {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 700;
    margin: var(--space-md) 0;
    min-height: 36px;
    text-align: center;
}

.spelling-controls {
    display: flex;
    gap: var(--space-md);
    margin-top: var(--space-lg);
    flex-wrap: wrap;
    justify-content: center;
}

.spelling-hint {
    background: linear-gradient(135deg, var(--accent-yellow), #FFF0A0);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    margin-top: var(--space-lg);
    text-align: center;
    display: none;
    box-shadow: var(--shadow-md);
    border: 2px solid var(--warning);
}


.word-card-mode {
    max-width: 920px;
}

.word-card-mode-toolbar {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-md);
    flex-wrap: wrap;
    margin-bottom: var(--space-lg);
}

.word-card-setting {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    padding: 6px 12px;
    font-weight: 600;
    color: var(--text-secondary);
}

.word-card-setting input {
    width: 70px;
    padding: 4px 6px;
    text-align: center;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}

.word-card-stage {
    padding: var(--space-md);
    background: linear-gradient(135deg, #FFF7ED, #FFFDF8);
    border-radius: var(--radius-xl);
    border: 2px solid rgba(255, 107, 53, 0.2);
    margin-bottom: var(--space-lg);
}

.word-card-main {
    position: relative;
    background: #FFFDF6;
    border: 3px solid #1F2937;
    border-radius: 28px;
    padding: 48px 36px;
    min-height: 320px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    gap: var(--space-md);
    cursor: pointer;
}

.word-card-progress {
    position: absolute;
    top: 18px;
    left: 18px;
    padding: 4px 10px;
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid var(--border-color);
    border-radius: 999px;
}

.word-card-audio {
    position: absolute;
    top: 16px;
    right: 18px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: 2px solid #1F2937;
    background: #E7F7EF;
    color: #0F766E;
    font-size: 1.1rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.word-card-english {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 800;
    color: var(--text-primary);
}

.word-card-phonetic {
    font-size: 1.2rem;
    color: var(--text-muted);
    letter-spacing: 2px;
}

.word-card-hint {
    font-size: 0.95rem;
    color: var(--text-muted);
}

.word-card-chinese {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--text-secondary);
    display: none;
}

.word-card-main.is-flipped .word-card-chinese {
    display: block;
}

.word-card-main.is-flipped .word-card-hint {
    display: none;
}

.word-card-flip {
    position: absolute;
    bottom: 18px;
    right: 18px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid #1F2937;
    background: #F0FDF4;
    color: #15803D;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.word-card-mode-toggles {
    display: flex;
    justify-content: center;
    gap: var(--space-xl);
    flex-wrap: wrap;
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-full);
    border: 2px dashed rgba(16, 185, 129, 0.4);
    background: rgba(16, 185, 129, 0.08);
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
}

.word-card-mode-toggles input {
    margin-right: var(--space-sm);
    accent-color: var(--success);
}

.word-card-mode-actions {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    flex-wrap: wrap;
}

@media (max-width: 768px) {
    .word-card-mode {
        max-width: 95vw;
    }

    .word-card-english {
        font-size: 2.2rem;
    }

    .word-card-main {
        padding: 36px 20px;
        min-height: 260px;
    }
}

@media (max-width: 600px) {
    .learning-settings {
        padding: var(--space-md);
    }

    .setting-group {
        width: 100%;
        flex-wrap: wrap;
    }

    .spelling-display {
        min-width: 0;
        width: min(100%, 320px);
        font-size: 1.8rem;
        letter-spacing: 2px;
        padding: var(--space-md) var(--space-lg);
    }

    .letter-tiles {
        gap: var(--space-sm);
    }

    .letter-tile {
        width: 44px;
        height: 44px;
        font-size: 1.2rem;
    }

    .pronunciation-option {
        padding: var(--space-sm) var(--space-md);
        font-size: 0.95rem;
    }

    .word-card-main {
        padding: 28px 18px;
    }

    .word-card-english {
        font-size: 1.9rem;
    }

    .word-card-chinese {
        font-size: 1.2rem;
    }
}

@media (max-width: 360px) {
    .spelling-display {
        font-size: 1.6rem;
    }

    .letter-tile {
        width: 40px;
        height: 40px;
        font-size: 1.1rem;
    }
}

@media (hover: none) {
    .letter-tile:hover,
    .pronunciation-option:hover {
        transform: none;
        box-shadow: var(--shadow-md);
    }
}