/* Hide the front checkbox when card is flipped, show the back checkbox */
.card.flipped .card-checkbox-label { display: none !important; }
.card.flipped .card-checkbox-label-back { display: inline-block !important; }
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    background-color: #f5f5f5;
    padding: 20px;
}

#main-content {
    padding-right: 20px;
}

.container {
    /* max-width: 1400px; */
    margin: 0 auto;
}

.grid {
    display: grid;
    grid-template-columns: 100px 1fr 1fr 1fr;
    gap: 10px;
    background-color: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.header-cell {
    background-color: #e8e8e8;
    padding: 15px;
    text-align: center;
    font-weight: bold;
    border-radius: 5px;
}

.row-header {
    background-color: #f0f0f0;
    padding: 15px;
    text-align: center;
    font-weight: bold;
    border-radius: 5px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.cell {
    background-color: #f9f9f9;
    padding: 15px;
    border-radius: 5px;
    position: relative;
    min-height: 200px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-content: flex-start;
}

.card {
    width: 120px;
    height: 150px;
    perspective: 1000px;
    cursor: pointer;
}

.card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    text-align: center;
    transition: transform 0.6s;
    transform-style: preserve-3d;
}

.card.flipped .card-inner {
    transform: rotateY(180deg);
}

.card-front, .card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    display: flex;
    flex-direction: column;
    padding: 10px;
}

.card-front {
    background-color: #ffffcc;
}

.card-back {
    background-color: #ffcccc;
    transform: rotateY(180deg);
}

.card-title {
    font-weight: bold;
    font-size: 14px;
    margin-bottom: 10px;
    text-align: center;
}

/* Make card checkboxes visually larger */
.card-checkbox {
    transform: scale(1.4);
    -webkit-transform: scale(1.4);
    margin: 4px;
    cursor: pointer;
    /* keep layout stable when transformed */
    transform-origin: center center;
}

.card-checkbox-label {
    display: inline-block;
    line-height: 0; /* avoid extra vertical gap */
}

.card-checkbox-label-back {
    display: none;
    line-height: 0;
}

/* Larger checkboxes for expanded cards as well */
.expanded-card .card-checkbox {
    transform: scale(1.6);
}

.card-content {
    font-size: 12px;
    text-align: left;
    overflow: hidden;
}

.expand-btn {
    position: absolute;
    bottom: 10px;
    right: 10px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    cursor: pointer;
    font-size: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
}

.expand-btn:hover {
    background-color: #45a049;
    transform: scale(1.1);
}

.overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    z-index: 1000;
}

.expanded-content {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 90%;
    height: 90%;
    background-color: white;
    border-radius: 10px;
    padding: 30px;
    z-index: 1001;
    display: none;
    overflow-y: auto;
}

.close-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    background-color: #f44336;
    color: white;
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    font-size: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.close-btn:hover {
    background-color: #da190b;
}

.expanded-cards {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-top: 40px;
}

.expanded-card {
    width: 200px;
    height: 250px;
    perspective: 1000px;
    cursor: pointer;
}

.expanded-card .card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    text-align: center;
    transition: transform 0.6s;
    transform-style: preserve-3d;
}

.expanded-card.flipped .card-inner {
    transform: rotateY(180deg);
}

.expanded-card .card-front,
.expanded-card .card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    display: flex;
    flex-direction: column;
    padding: 20px;
}

.expanded-card .card-title {
    font-size: 18px;
    margin-bottom: 15px;
}

.short-content-text {
    font-size: xx-small;
}

.expanded-card .card-content {
    font-size: 14px;
}

.chevron-down {
    display: inline-block;
    width: 12px;
    height: 12px;
    border-style: solid;
    border-width: 0 4px 4px 0;
    border-color: transparent #888 #888 transparent;
    transform: rotate(45deg);
    margin-top: 2px;
    animation: chevron-bounce 1.2s 3;
}

@keyframes chevron-bounce {
    0%, 100% { transform: translateY(0) rotate(45deg); opacity: 0.7; }
    50% { transform: translateY(6px) rotate(45deg); opacity: 1; }
}

.click-hint { 
    pointer-events: none; 
}

/* Shared action button styles */
.action-btn {
    background: #ddd;
    color: white;
    border: none;
    border-radius: 8px;
    padding: 1%;
    font-weight: 600;
    box-shadow: 0 6px 18px rgba(0,0,0,0.12);
    cursor: pointer;
    z-index: 2001;
    font-size: x-large;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

/* Per-button color overrides */
.download-word-btn { background: #2b8cff; box-shadow: 0 4px 12px rgba(43,140,255,0.28); }
.download-word-btn:hover { background: #1b73e8; }

.select-all-btn { background: #4CAF50; box-shadow: 0 4px 12px rgba(76,175,80,0.22); }
.select-all-btn:hover { background: #3ea34a; }

/* When in unselect mode show red button */
.select-all-btn.unselect-mode { background: #f44336; box-shadow: 0 4px 12px rgba(244,67,54,0.22); }
.select-all-btn.unselect-mode:hover { background: #da190b; }

#side-panel-description {
    font-size: large;
    margin-top: 10px;
    display:none;
    border-top:1px solid #eee;color:#444;
}