:root {
    --primary-color: #4a90e2;
    --secondary-color: #50e3c2;
    --background-color: #f0f4f8;
    --card-hormone-bg: #fff1f0;
    --card-hormone-border: #ffccc7;
    --card-item-bg: #f6ffed;
    --card-item-border: #b7eb8f;
    --card-selected: #fffbe6;
    --card-selected-border: #ffe58f;
    --text-color: #333;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh; /* 修正：直接用 height */
    overflow: auto; /* 允許滾動 */
}
.hud {
    display: flex;
    align-items: center;
    gap: 16px; /* 控制間距，可調整 */
}

.game-container {
    background: white;
    padding: 15px;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    max-width: 1200px;
    width: 98vw;
    height: 98vh; /* 修正：最大化高度 */
    display: flex;
    flex-direction: column;
    align-items: center;
}


.game-wrapper {
    width: 100%;
    height: 100%;
    flex: 1;
    display: flex;
    flex-direction: column;
}
.grid {
    width: 100%;
    height: 100%;
    flex: 1;
    display: grid;
    gap: 4px;
    padding: 5px;
    background: #e6f7ff;
    border-radius: 8px;
    user-select: none;
    overflow: hidden; /* 不顯示捲動條 */
    align-content: stretch;
    justify-content: stretch;
}
.card {
    /* Responsive sizing */
    width: 100%;
    height: 100%;
    min-width: 60px; /* Minimum legibility */
    min-height: 20px;
    aspect-ratio: 5 / 3; /* Maintain shape */
    
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 2px;
    border: 2px solid #ccc;
    border-radius: 6px;
    background-color: white;
    font-size: 1.5rem; /* 原本是 0.85rem，這裡調大 */
    font-weight: 500;
    cursor: pointer;
    transition: transform 0.1s, background-color 0.2s, opacity 0.3s;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.card.hormone {
    background-color: var(--card-hormone-bg);
    border-color: var(--card-hormone-border);
    color: #cf1322;
}

.card.item {
    background-color: var(--card-item-bg);
    border-color: var(--card-item-border);
    color: #389e0d;
}

.card.selected {
    background-color: var(--card-selected);
    border-color: var(--card-selected-border);
    transform: scale(0.95);
    box-shadow: inset 0 0 5px rgba(0,0,0,0.1);
}

.card.matched {
    opacity: 0;
    pointer-events: none;
}

.card.empty {
    visibility: hidden;
    pointer-events: none;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
}

.modal.hidden {
    display: none;
}

.modal-content {
    background-color: white;
    padding: 40px;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.modal-content h2 {
    margin-bottom: 20px;
    color: var(--primary-color);
}

.modal-content p {
    margin: 10px 0;
    font-size: 1.2rem;
}

.modal-content button {
    margin-top: 20px;
}