@import url('https://fonts.googleapis.com/css2?family=Open+Sans:ital,wght@0,300..800;1,300..800&display=swap');

:root {
    
    --color-background-primary: #36393F;
    --color-background-secondary: #2F3136;
    --color-element-primary: #40444B; 
    --color-element-secondary: #4E525A; 
    --color-text-light: #DCDDDE; 
    --color-text-medium: #99AAB5; 
    --color-brand-blue: #7289DA; 
    --color-brand-blue-hover: #677BC4; 
    --color-success: #43B581; 
    --color-success-hover: #3AA675;
    --color-completion: #2D6A4F; 
    --color-completion-border: #1B4332;
    --color-win-line: #A53F2B; 
    --color-win-line-border: #782D20;
    --color-error-warning: #FAA61A; 

    --board-size: 6;
    --gap-size: 5px;
    --max-cell-size: 85px; 
    
    --animation-duration-fast: 0.2s;
    --animation-duration-medium: 0.4s;
    --animation-duration-slow: 10s; 
    --animation-timing-ease: ease;
}

body {
    font-family: 'Open Sans', sans-serif;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center; 
    background-color: var(--color-background-primary); 
    color: var(--color-text-light);
    margin: 0;
    padding: 20px;
    min-height: 100vh;
    overflow-x: hidden; 
    box-sizing: border-box;
}
.container {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
    margin: 0 auto;
}
h1 {
    color: var(--color-brand-blue); 
    margin-bottom: 10px;
}

.difficulty-select-group {
    margin: 15px 0 20px 0;
    display: flex;
    align-items: center;
    gap: 10px;
}

.difficulty-select-group label {
    font-size: 1.1em;
    color: var(--color-text-light); 
}

#difficulty-select {
    padding: 8px 12px;
    border: 2px solid var(--color-element-primary); 
    border-radius: 5px;
    background-color: var(--color-element-secondary); 
    color: var(--color-text-light); 
    font-size: 1.0em;
    cursor: pointer;
    transition: border-color var(--animation-duration-fast) var(--animation-timing-ease);
}

#difficulty-select:focus {
    border-color: var(--color-brand-blue); 
    outline: none;
}

#bingo-board-wrapper {
    max-width: calc(var(--max-cell-size) * var(--board-size) + var(--gap-size) * (var(--board-size) - 1));
    overflow: hidden; 
    margin-top: 10px;
    padding-bottom: 5px; 
}

#bingo-board {
    display: grid;
    grid-template-columns: repeat(var(--board-size), var(--max-cell-size));
    gap: var(--gap-size);
    max-width: 100%; 
    margin: 0 auto;
    position: relative;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: scale(0.5) translateY(20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.item-cell {
    background-color: var(--color-element-primary); 
    border: 2px solid var(--color-background-secondary); 
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    position: relative;
    transition: transform var(--animation-duration-fast), background-color var(--animation-duration-fast);
    text-align: center;
    box-sizing: border-box;
    padding: 5px;
    opacity: 0; 
    transform: scale(0.5); 
    width: var(--max-cell-size); 
    height: var(--max-cell-size); 
}

.item-cell.animate-in {
    animation: fadeIn var(--animation-duration-medium) ease-out forwards;
}

.item-cell:hover {
    transform: scale(1.03);
    background-color: var(--color-element-secondary); 
}
.item-cell.completed {
    background-color: var(--color-completion); 
    border-color: var(--color-completion-border); 
}

.item-cell.win-line {
    background-color: var(--color-win-line); 
    border-color: var(--color-win-line-border); 
}

.item-image {
    max-width: 80%;
    max-height: 80%;
    object-fit: contain;
}

.item-name {
    font-size: 10px;
    word-break: break-word;
}

.button-group {
    display: flex;
    gap: 15px; 
    margin-top: 20px; 
    width: 100%; 
    max-width: 450px;
    justify-content: center;
}

.button-group button {
    flex: 1;
    padding: 12px;
    font-size: 1.1em;
    background-color: var(--color-brand-blue); 
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: all var(--animation-duration-fast) var(--animation-timing-ease);
    text-align: center;
}

.button-group button:hover {
    background-color: var(--color-brand-blue-hover); 
    transform: translateY(-2px);
}

.import-export-section {
    width: 100%;
    max-width: 450px;
    margin-top: 30px;
    padding: 15px;
    background-color: var(--color-background-secondary); 
    border-radius: 8px;
}

.import-export-section h2 {
    font-size: 1.2em;
    color: var(--color-text-medium); 
    margin-top: 0;
}

#board-code-input {
    width: 100%;
    box-sizing: border-box;
    padding: 10px;
    border: 1px solid var(--color-element-primary); 
    border-radius: 4px;
    background-color: var(--color-element-primary); 
    color: var(--color-text-light); 
    resize: none;
    font-family: monospace;
    font-size: 0.9em;
}

.share-buttons {
    margin-top: 10px;
    width: 100%; 
}

#image-tooltip {
    position: absolute;
    display: none;
    padding: 5px 10px;
    background-color: rgba(0, 0, 0, 0.85);
    color: white;
    border-radius: 4px;
    pointer-events: none;
    z-index: 1000;
    font-size: 14px;
    white-space: nowrap;
    left: auto;
    right: auto;
}
.other-mode-link {
    display: block;
    margin-top: 15px;
    color: var(--color-text-medium); 
    text-decoration: none;
    transition: color var(--animation-duration-fast);
}

.other-mode-link:hover {
    color: var(--color-text-light); 
}

.popup-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    display: none; 
    justify-content: center;
    align-items: flex-start; 
    z-index: 2000;
    opacity: 0;
    transition: opacity 0.3s ease;
    padding-top: 50px; 
    box-sizing: border-box;
}

.popup-container.show {
    display: flex;
    opacity: 1;
}

.popup-container.main-popup .popup-content {
    background-color: var(--color-background-secondary); 
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
    width: 90%;
    max-width: 400px;
    text-align: center;
    position: relative;
    transform: translateY(-100vh); 
    transition: transform 0.4s cubic-bezier(0.25, 0.1, 0.25, 1.5); 
}

.popup-container.show .popup-content {
    transform: translateY(0); 
}

.popup-container.hide .popup-content {
    transform: translateY(-100vh); 
    transition: transform 0.3s ease-in;
}

.popup-content h3 {
    color: var(--color-brand-blue); 
    margin-top: 0;
    margin-bottom: 10px;
    font-size: 1.3em;
}

#popup-board-code {
    background-color: var(--color-element-primary); 
    padding: 10px;
    border-radius: 4px;
    word-break: break-all;
    font-family: monospace;
    font-size: 0.9em;
    border: 1px solid var(--color-element-secondary); 
    display: block;
}

.close-btn {
    position: absolute;
    top: 10px;
    right: 15px;
    font-size: 24px;
    font-weight: bold;
    color: var(--color-text-medium); 
    cursor: pointer;
    transition: color var(--animation-duration-fast);
}

.close-btn:hover {
    color: var(--color-text-light); 
}

.popup-content button {
    margin-top: 15px;
    padding: 10px 20px;
    background-color: var(--color-success); 
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color var(--animation-duration-fast);
}

.popup-content button:hover {
    background-color: var(--color-success-hover); 
}

.notification-popup {
    background-color: transparent; 
    pointer-events: none; 
    padding-top: 20px;
    align-items: flex-start;
    height: auto; 
    max-height: 100px;
}

.notification-content {
    background-color: var(--color-brand-blue); 
    color: white;
    padding: 12px 25px;
    border-radius: 5px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
    transform: translateY(-100px); 
    transition: transform 0.3s ease-out;
    max-width: 300px;
    text-align: center;
    font-weight: bold;
}

.notification-popup.show .notification-content {
    transform: translateY(0); 
}

.notification-popup.hide .notification-content {
    transform: translateY(-100px); 
    transition: transform 0.3s ease-in;
}

.bingo-line {
    position: absolute;
    background-color: red;
    z-index: 10;
    pointer-events: none;
    transition: width 0.5s ease, height 0.5s ease, opacity 0.3s ease;
    opacity: 0;
}

.bingo-line.show {
    opacity: 1;
}

#achievements-section {
    margin: 20px 0;
    text-align: center;
}

#achievements-bar {
    display: flex;
    justify-content: center;
    gap: var(--gap-size);
    background-color: var(--color-background-secondary);
    padding: 15px;
    border-radius: 8px;
    border: 2px solid var(--color-element-primary);
}

.achievement-icon {
    width: var(--max-cell-size);
    height: var(--max-cell-size);
    background-color: var(--color-element-primary);
    border: 2px solid var(--color-element-secondary);
    border-radius: 4px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: help;
    transition: all 0.2s ease;
}

.achievement-icon:hover {
    background-color: var(--color-element-secondary);
    border-color: var(--color-brand-blue);
    transform: scale(1.1);
}

.achievement-icon img {
    width: 70%;
    height: 70%;
    object-fit: contain;
}

@media (max-width: 600px) {
    :root {
        --cell-size-vw: 14vw; 
        --gap-size: 0.5vw;
    }
    
    #bingo-board-wrapper {
        padding: 0 10px;
        box-sizing: border-box;
    }

    #bingo-board {
        grid-template-columns: repeat(var(--board-size), var(--cell-size-vw));
        gap: var(--gap-size);
        width: 100%;
    }
    .item-cell {
        width: var(--cell-size-vw); 
        height: var(--cell-size-vw); 
    }
    .item-name {
        font-size: 2vw;
    }
    .achievement-icon {
        width: var(--cell-size-vw);
        height: var(--cell-size-vw);
    }
}

@media (max-width: 400px) {
    :root {
        --cell-size-vw: 15vw; 
        --gap-size: 0.5vw;
    }
    .item-name {
        font-size: 2.2vw;
    }
}


@media (max-width: 500px) {
    .button-group button {
        flex-basis: auto; 
        font-size: 1em;
    }
    .button-group {
        flex-direction: column;
        gap: 10px;
    }
}

@media (max-width: 382px) {
    .difficulty-select-group label{
        font-size: 1em;
    }
}

@media (max-width: 362px){
    .difficulty-select-group label{
        font-size: 0.9em;
    }
}

@media (max-width: 342px){
    .difficulty-select-group label{
        font-size: 0.8em;
    }
}

@media (max-width: 322px){
    .difficulty-select-group label{
        font-size: 0.7em;
    }
}