:root {
    --bg-primary: #e8f4fd;
    --container-bg: #ffffff;
    --text-color: #2c3e50;
    --accent-green: #2ecc71;
    --accent-red: #ff7675;
    --accent-blue: #3498db;
    --parent-panel: #ffeaa7;
    --box-a-color: #fffae6;
    --box-b-color: #e6f7ff;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Comic Sans MS', 'Chalkboard SE', sans-serif;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 80px 20px 20px 20px;
}

.game-window {
    background: var(--container-bg);
    border-radius: 24px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 855px;
    padding: 30px;
    text-align: center;
    border: 6px solid #dff9fb;
}

/* Parent Panel Area */
.parent-config {
    background-color: var(--parent-panel);
    border: 3px dashed #d35400;
    border-radius: 16px;
    padding: 15px;
    margin-bottom: 25px;
}

.parent-title {
    font-size: 0.9rem;
    font-weight: bold;
    color: #d35400;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 12px;
}

.parent-settings-row {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

.emoji-selector {
    display: flex;
    gap: 8px;
}

.emoji-opt {
    font-size: 1.6rem;
    background: white;
    border: 3px solid #ccc;
    border-radius: 12px;
    width: 44px;
    height: 44px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all 0.2s ease;
}

.emoji-opt.selected {
    border-color: #e67e22;
    background-color: #fff2cc;
    transform: scale(1.1);
}

.parent-input-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.parent-input {
    height: 38px;
    font-size: 1rem;
    padding: 5px 10px;
    border: 2px solid #d35400;
    border-radius: 8px;
    outline: none;
}

.parent-input.name-input { width: 140px; }
.parent-input.num-input { width: 65px; text-align: center; }

.btn-parent-load {
    background-color: #e67e22;
    color: white;
    border: none;
    padding: 8px 14px;
    font-weight: bold;
    border-radius: 8px;
    cursor: pointer;
    box-shadow: 0 3px #b35b10;
}
.btn-parent-load:active {
    transform: translateY(2px);
    box-shadow: 0 1px #b35b10;
}

/* Scoreboards */
.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.badge {
    padding: 8px 16px;
    border-radius: 12px;
    font-weight: bold;
    font-size: 1.1rem;
    background-color: #f1f2f6;
}
.q-badge { background-color: #a29bfe; color: white; }
.score-badge { background-color: #fdcb6e; color: #2c3e50; }

.child-greeting {
    font-size: 1.6rem;
    color: var(--accent-blue);
    font-weight: bold;
    margin-bottom: 15px;
}

/* Vertical Math Worksheet Engine Layout */
.worksheet-grid {
    display: grid;
    grid-template-columns: 80px 100px auto;
    align-items: center;
    row-gap: 20px;
    max-width: 750px;
    margin: 0 auto 25px auto;
}

.math-sign {
    font-size: 4rem;
    font-weight: bold;
    color: #7f8c8d;
    text-align: center;
}

.big-number {
    font-size: 5rem;
    font-weight: bold;
    color: var(--text-color);
    text-align: center;
    background: #f1f2f6;
    border-radius: 12px;
    padding: 5px;
    margin-right: 15px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.sandbox-box {
    border-radius: 16px;
    padding: 15px;
    border: 3px solid #b2bec3;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
    display: flex;
    align-items: center;
    gap: 15px;
    text-align: left;
}
.sandbox-box.type-a { background-color: var(--box-a-color); border-color: #f39c12; }
.sandbox-box.type-b { background-color: var(--box-b-color); border-color: #2980b9; }

.sandbox-canvas {
    background-color: rgba(255, 255, 255, 0.8);
    border-radius: 12px;
    min-height: 80px;
    flex-grow: 1;
    padding: 10px;
    display: flex;
    flex-wrap: wrap;
    align-content: center;
    gap: 6px;
    border: 1px solid rgba(0,0,0,0.1);
}

.sandbox-emoji {
    font-size: 2.2rem;
    animation: popIn 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
    user-select: none;
}

@keyframes popIn {
    0% { transform: scale(0); }
    100% { transform: scale(1); }
}

.sandbox-controls {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.btn-action {
    border: none;
    color: white;
    font-size: 0.95rem;
    font-weight: bold;
    padding: 8px 14px;
    border-radius: 50px;
    cursor: pointer;
    transition: transform 0.1s ease, box-shadow 0.1s ease;
    white-space: nowrap;
}
.btn-add { background-color: var(--accent-green); box-shadow: 0 4px #27ae60; }
.btn-remove { background-color: var(--accent-red); box-shadow: 0 4px #c0392b; }
.btn-action:active { transform: translateY(3px); box-shadow: 0 1px transparent; }

/* The Worksheet Underline Separator */
.worksheet-line {
    grid-column: 1 / span 3;
    height: 6px;
    background-color: var(--text-color);
    border-radius: 3px;
    margin: 5px 0;
}

/* Bottom Row Answer Container */
.answer-row-wrapper {
    grid-column: 1 / span 3;
    display: flex;
    justify-content: flex-start;
    align-items: center;
    padding-left: 80px;
    gap: 25px;
}

.input-box {
    width: 100px;
    height: 65px;
    font-size: 2.5rem;
    text-align: center;
    border: 3px solid var(--accent-blue);
    border-radius: 12px;
    color: var(--text-color);
    outline: none;
}
.btn-submit {
    background-color: var(--accent-blue);
    box-shadow: 0 5px #2980b9;
    font-size: 1.3rem;
    padding: 14px 30px;
    border-radius: 50px;
}

/* Popup Notification Screen */
.modal-screen {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.5);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 100;
}
.modal-card {
    background: white;
    padding: 40px;
    border-radius: 24px;
    text-align: center;
    width: 90%;
    max-width: 400px;
}
.modal-card h2 { font-size: 2.2rem; color: var(--accent-green); margin-bottom: 10px; }
.modal-card p { font-size: 1.2rem; margin-bottom: 20px; }

/* Responsive Adjustments */
@media (max-width: 768px) {
    body {
        padding: 100px 10px 20px 10px;
    }

    .game-window {
        padding: 15px;
    }

    .child-greeting {
        font-size: 1.3rem;
    }

    .badge {
        font-size: 0.9rem;
        padding: 6px 10px;
    }

    .worksheet-grid {
        grid-template-columns: 60px 80px 1fr;
        gap: 10px;
    }

    .big-number {
        font-size: 3rem;
        margin-right: 5px;
        padding: 10px 5px;
    }

    .math-sign {
        font-size: 2.5rem;
    }

    .sandbox-box {
        padding: 10px;
        gap: 10px;
    }

    .sandbox-emoji {
        font-size: 1.8rem;
    }

    .btn-action {
        padding: 6px 10px;
        font-size: 0.85rem;
    }

    .answer-row-wrapper {
        padding-left: 0;
        justify-content: center;
        gap: 15px;
    }

    .input-box {
        width: 80px;
        height: 55px;
        font-size: 2rem;
    }

    .btn-submit {
        padding: 10px 20px;
        font-size: 1.1rem;
    }
}

@media (max-width: 480px) {
    .worksheet-grid {
        grid-template-columns: 40px 60px 1fr;
    }

    .big-number {
        font-size: 2.2rem;
    }

    .math-sign {
        font-size: 2rem;
    }

    .sandbox-box {
        flex-direction: column;
        align-items: stretch;
    }

    .sandbox-controls {
        flex-direction: row;
        justify-content: center;
    }

    .parent-settings-row {
        flex-direction: column;
        gap: 10px;
    }

    .emoji-selector {
        order: -1;
    }
}