:root {
    --color-bg: #F4F5F7;
    --color-surface: #FFFFFF;
    --color-border: #E1E4EA;
    --color-text: #1B1E27;
    --color-text-secondary: #5A6270;

    --color-accent: #2A3EB1;
    --color-accent-hover: #223491;
    --color-accent-tip: #7FA6D9;
    --color-accent-bg: #EEF1FB;

    --color-success: #3B6D11;
    --color-success-hover: #2C5A0E;
    --color-success-bg: #EAF3DE;
    --color-danger: #A32D2D;
    --color-danger-bg: #FCEBEB;
    --color-reward: #E06A1F;

    --font-display: 'Space Grotesk', sans-serif;
    --font-body: 'Plus Jakarta Sans', sans-serif;
    --font-mono: 'IBM Plex Mono', monospace;
}

body {
    font-family: var(--font-body);
    background-color: var(--color-bg);
    color: var(--color-text);
}

h1, h2, h3, .task-question {
    font-family: var(--font-display);
    color: var(--color-text);
}

.app-header {
    padding: 14px 0;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 1.5rem;
}

.app-wordmark {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.15rem;
    color: var(--color-accent);
    letter-spacing: -0.01em;
    text-decoration: none;
}

.task-progress {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    margin: 0 0 1rem;
}

.progress-track {
    position: relative;
    height: 5px;
    background: var(--color-border);
    border-radius: 999px;
    margin-bottom: 8px;
}

.progress-fill {
    height: 100%;
    background: var(--color-accent);
    border-radius: 999px;
}

.progress-tip {
    position: absolute;
    top: 50%;
    width: 9px;
    height: 9px;
    background: var(--color-accent-tip);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    border: 2px solid var(--color-bg);
}

.feedback {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    border-radius: 8px;
    padding: 12px 14px;
    margin: 1rem 0;
    font-size: 0.95rem;
}

.feedback--correct {
    background: var(--color-success-bg);
    color: var(--color-success);
}

.feedback--wrong {
    background: var(--color-danger-bg);
    color: var(--color-danger);
}

.spark-icon {
    flex-shrink: 0;
    margin-top: 2px;
    fill: var(--color-reward);
}

.options-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin: 20px 0;
}

.option-label {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    padding: 10px 14px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    background-color: var(--color-surface);
}

.option-label:hover {
    background-color: var(--color-accent-bg);
    border-color: var(--color-accent);
}

.hidden {
    display: none;
}

.app-footer {
    margin-top: 2rem;
    padding-top: 1rem;
    text-align: center;
    font-size: 0.85rem;
}

.lesson-index-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.game-controls {
    display: flex;
    gap: 0.5rem;
    margin-top: 10px;
}

.stats-table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

.stats-table th,
.stats-table td {
    text-align: left;
    padding: 8px 12px;
    border-bottom: 1px solid #ddd;
}

.mole-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin: 20px 0;
}

.mole-hole {
    width: 100%;
    height: 90px;
    border: none;
    border-radius: 50% / 40%;
    background: radial-gradient(ellipse at center, #6b4a30 0%, #4a3320 60%, #2e1f13 100%);
    box-shadow: inset 0 6px 12px rgba(0, 0, 0, 0.6);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: transparent;
    font-weight: bold;
    text-align: center;
    padding: 0 8px;
}

.mole-hole.mole-visible {
    background: #fdf6e3;
    color: #2e1f13;
    box-shadow: 0 0 0 4px #4da855, inset 0 -4px 6px rgba(0, 0, 0, 0.15);
    animation: mole-pop 150ms ease-out;
}

@keyframes mole-pop {
    from {
        transform: scale(0.7);
    }
    to {
        transform: scale(1);
    }
}

.btn.btn-primary {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: #fff;
}

.btn.btn-primary:hover,
.btn.btn-primary:focus,
.btn.btn-primary.active,
.btn.btn-primary:active {
    background: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
    color: #fff;
}

.btn.btn-success {
    background: var(--color-success);
    border-color: var(--color-success);
    color: #fff;
}

.btn.btn-success:hover,
.btn.btn-success:focus,
.btn.btn-success.active,
.btn.btn-success:active {
    background: var(--color-success-hover);
    border-color: var(--color-success-hover);
    color: #fff;
}