/* ===== Character Grid ===== */
.char-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
    gap: 0.75rem;
}

.char-grid--compact {
    grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
    gap: 0.5rem;
}

/* ===== Character Tile ===== */
.char-tile {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 0.5rem;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    position: relative;
    min-height: 100px;
}

.char-tile:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.char-tile:active {
    transform: translateY(0);
}

.char-tile--compact {
    padding: 0.5rem 0.25rem;
    min-height: 80px;
}

.char-tile__hanzi {
    font-family: 'Noto Sans SC', sans-serif;
    font-size: 2rem;
    font-weight: 500;
    color: var(--gray-900);
    line-height: 1.2;
}

.char-tile--compact .char-tile__hanzi {
    font-size: 1.5rem;
}

.char-tile__pinyin {
    font-size: 0.8125rem;
    font-weight: 500;
    margin-top: 0.25rem;
}

.char-tile__german {
    font-size: 0.6875rem;
    color: var(--gray-500);
    margin-top: 0.125rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 100%;
}

.char-tile__lesson {
    position: absolute;
    top: 0.25rem;
    right: 0.375rem;
    font-size: 0.625rem;
    color: var(--gray-400);
    font-weight: 600;
}

/* ===== Status Badges ===== */
.char-tile[data-status="learning"] {
    border-color: var(--info);
    border-width: 2px;
}

.char-tile[data-status="known"] {
    border-color: var(--warning);
    border-width: 2px;
}

.char-tile[data-status="mastered"] {
    border-color: var(--success);
    border-width: 2px;
}

/* ===== Tone Colors ===== */
.tone-1 { color: var(--tone-1); }
.tone-2 { color: var(--tone-2); }
.tone-3 { color: var(--tone-3); }
.tone-4 { color: var(--tone-4); }
.tone-neutral { color: var(--gray-500); }

/* Tone color definitions */
:root {
    --tone-1: #e74c3c;  /* Red - high flat */
    --tone-2: #27ae60;  /* Green - rising */
    --tone-3: #3498db;  /* Blue - dipping */
    --tone-4: #e67e22;  /* Orange - falling */
}

[data-theme="dark"] {
    --tone-1: #ff6b6b;
    --tone-2: #51cf66;
    --tone-3: #74c0fc;
    --tone-4: #ffa94d;
}

/* ===== Character Detail Card ===== */
.char-detail {
    text-align: center;
}

.char-detail__hanzi {
    font-family: 'Noto Sans SC', sans-serif;
    font-size: 5rem;
    font-weight: 500;
    color: var(--gray-900);
    line-height: 1.2;
    margin-bottom: 0.5rem;
}

.char-detail__pinyin {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.char-detail__german {
    font-size: 1.125rem;
    color: var(--gray-600);
    margin-bottom: 1.5rem;
}

.char-detail__meta {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    font-size: 0.875rem;
    color: var(--gray-500);
}

.char-detail__meta span {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

/* Hanzi Writer Container */
.char-detail__writer {
    display: flex;
    justify-content: center;
    margin: 1.5rem 0;
}

.char-detail__writer svg {
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
}

.char-detail__actions {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

/* ===== Quiz UI ===== */
.quiz-container {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.quiz-progress {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.quiz-progress__bar {
    flex: 1;
    height: 6px;
    background: var(--gray-200);
    border-radius: 3px;
    overflow: hidden;
}

.quiz-progress__fill {
    height: 100%;
    background: var(--primary);
    border-radius: 3px;
    transition: width 0.3s ease;
}

.quiz-progress__text {
    font-size: 0.8125rem;
    color: var(--gray-500);
    font-weight: 500;
    white-space: nowrap;
}

.quiz-prompt {
    margin-bottom: 2rem;
}

.quiz-prompt__hanzi {
    font-family: 'Noto Sans SC', sans-serif;
    font-size: 5rem;
    font-weight: 500;
    color: var(--gray-900);
    line-height: 1.2;
}

.quiz-prompt__text {
    font-size: 1.25rem;
    color: var(--gray-600);
    margin-top: 0.5rem;
}

/* Quiz Options (4 buttons) */
.quiz-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.quiz-option {
    padding: 1rem;
    background: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: var(--transition);
    font-size: 1rem;
    text-align: center;
}

.quiz-option:hover {
    border-color: var(--primary-light);
    background: var(--primary-bg);
}

.quiz-option--correct {
    border-color: var(--success);
    background: var(--success-bg);
    color: var(--success-text);
}

.quiz-option--wrong {
    border-color: var(--danger);
    background: var(--danger-bg);
    color: var(--danger-text);
}

.quiz-option--disabled {
    pointer-events: none;
    opacity: 0.6;
}

.quiz-option__hanzi {
    font-family: 'Noto Sans SC', sans-serif;
    font-size: 2.5rem;
    font-weight: 500;
    display: block;
    margin-bottom: 0.25rem;
}

.quiz-option__pinyin {
    font-size: 0.875rem;
    color: var(--gray-500);
}

/* Quiz Result */
.quiz-result {
    padding: 2rem;
    text-align: center;
}

.quiz-result__score {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.quiz-result__label {
    font-size: 1.125rem;
    color: var(--gray-600);
    margin-bottom: 1.5rem;
}

/* ===== Tone Drill ===== */
.tone-drill {
    max-width: 500px;
    margin: 0 auto;
    text-align: center;
}

.tone-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.75rem;
    margin: 1.5rem 0;
}

.tone-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem;
    background: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: var(--transition);
}

.tone-btn:hover {
    border-color: var(--primary-light);
}

.tone-btn__number {
    font-size: 1.5rem;
    font-weight: 700;
}

.tone-btn__label {
    font-size: 0.75rem;
    color: var(--gray-500);
}

.tone-btn[data-tone="1"] .tone-btn__number { color: var(--tone-1); }
.tone-btn[data-tone="2"] .tone-btn__number { color: var(--tone-2); }
.tone-btn[data-tone="3"] .tone-btn__number { color: var(--tone-3); }
.tone-btn[data-tone="4"] .tone-btn__number { color: var(--tone-4); }

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .char-grid {
        grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
        gap: 0.5rem;
    }

    .char-tile {
        padding: 0.5rem 0.25rem;
        min-height: 85px;
    }

    .char-tile__hanzi {
        font-size: 1.75rem;
    }

    .char-tile__pinyin {
        font-size: 0.75rem;
    }

    .char-tile__german {
        font-size: 0.625rem;
    }

    .char-detail__hanzi {
        font-size: 4rem;
    }

    .quiz-prompt__hanzi {
        font-size: 4rem;
    }

    .quiz-options {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .char-grid {
        grid-template-columns: repeat(auto-fill, minmax(75px, 1fr));
    }

    .tone-buttons {
        grid-template-columns: repeat(2, 1fr);
    }
}