:root {
    /* Background colors */
    --color-bg-game: hsla(210, 20%, 35%, 1);
    --color-bg-highlight: hsla(56, 50%, 50%, 0.9);
    --color-bg-button: hsl(200, 30%, 50%, 0.9);
    --color-bg-button-dark: hsla(200, 30%, 45%, 0.9);
    --color-bg-button-light: hsla(200, 30%, 55%, 0.9);
    --color-bg-tfoot: hsla(200, 30%, 40%, 0.9);
    --color-bg-modal-overlay: rgba(0, 0, 0, 0.7);
    
    /* Text colors */
    --color-text: hsla(0, 0%, 90%, 0.9);
    --color-text-grey: hsla(0, 0%, 75%, 0.9);
    --color-text-dark: hsla(0, 0%, 100%, 0.9);
    
    /* Border colors */
    --color-border: hsla(200, 20%, 40%, 0.9);
    
    /* Shadow colors */
    --color-shadow-light: rgba(0, 0, 0, 0.2);
    --color-shadow-medium: rgba(0, 0, 0, 0.3);
    --color-shadow-heavy: rgba(0, 0, 0, 0.5);
    
    /* Overlay/transparency colors */
    --color-overlay-light: rgba(255, 255, 255, 0.03);
    --color-overlay-dark: rgba(0, 0, 0, 0.05);
    --color-overlay-hover: rgba(255, 255, 255, 0.05);
    --color-overlay-focus: rgba(255, 255, 255, 0.08);
    --color-overlay-row-even: rgba(255, 255, 255, 0.025);
    --color-overlay-row-hover: rgba(255, 255, 255, 0.25);
    --color-overlay-category-hover: rgba(255, 255, 255, 0.35);
    
    /* Dice/die colors */
    --color-die-bg: rgba(255, 255, 255, 0.1);
    --color-die-bg-light: rgba(255, 255, 255, 0.05);
    
    /* Highlight/accent colors */
    --color-highlight: rgba(144, 238, 144, 0.1);
    --color-highlight-hover: rgba(229, 238, 144, 0.35);
    --color-highlight-placed: rgba(229, 238, 144, 0.2);
    --color-highlight-empty: rgba(229, 238, 144, 0.05);
    --color-highlight-glow: rgba(229, 238, 144, 0.5);
    --color-highlight-suggested: rgba(229, 238, 144, 0.12);
    --color-highlight-red-hover: rgba(255, 100, 100, 0.3);
    
    /* Animation related */
    --roll-animation-duration: 0.5s;
    
    /* Spacing & sizing */
    --spacing-xs: 0.25em;
    --spacing-sm: 0.5em;
    --spacing-md: 1em;
    --spacing-lg: 2em;
    --border-radius-sm: 0.3em;
    --border-radius-md: 0.4em;
    --border-radius-lg: 0.8em;
}

* {
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    min-width: 100vw;
    height: 100vh;
    width: 100vw;
    margin: 0;
    padding: 0;
    background-color: var(--color-bg-game);
    color: var(--color-text);
    font-size: 16px;
    overflow: hidden;
}

a {
    color: var(--color-text);
    text-decoration: none;
}
a:hover {
    text-decoration: underline;
}

#game-container {
    /* Fill viewport, aspect ratio constraint via max properties */
    width: 100vw;
    height: 100vh;
    aspect-ratio: 16 / 9;
    max-width: 100vw;
    max-height: 100vh;
    
    display: flex;
    flex-direction: column;
    
    background-color: var(--color-bg-game);
    padding: var(--spacing-sm);
    box-shadow: 0 0 2em var(--color-shadow-heavy);
    overflow: hidden;
    contain: layout style paint;
    
    /* Font scales with viewport */
    font-size: clamp(8px, 1.8vmin, 24px);
}

header {
    flex-shrink: 0;
    height: 1.8em;
    display: grid;
    grid-template-columns: 1fr auto 1fr; 
    align-items: center;
    width: 100%;
    margin-block-end: var(--spacing-sm);
    gap: var(--spacing-sm);
    position: relative;
}

button {
    outline: none;
    font-size: 0.85em;
    padding: 0.35em 0.6em;
    border-radius: var(--border-radius-md);
    border: 0.06em solid var(--color-border);
    background-color: var(--color-bg-button);
    color: var(--color-text);
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 0.1em 0.2em var(--color-shadow-light);
}
button:hover:not(:disabled), button:focus:not(:disabled) {
    filter: brightness(1.2);
    box-shadow: 0 0.15em 0.3em var(--color-shadow-medium);

}
button:active:not(:disabled) {
    box-shadow: 0 0.05em 0.1em var(--color-shadow-light);
}
button:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    filter: grayscale(0.5);
}
button.primary {
    background: linear-gradient(135deg, var(--color-bg-button) 0%, var(--color-bg-button-dark) 100%);
    font-weight: bold;
    box-shadow: 0 0.15em 0.3em var(--color-shadow-medium);
}
button.primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--color-bg-button-light) 0%, var(--color-bg-button) 100%);
}

a:focus {
    filter: brightness(1.25);
}

#title {
    font-size: 1.6em;
    color: var(--color-text);
    display: flex; 
    align-items: center;
    justify-content: center;
    grid-column: 2;
    justify-self: center;
    font-weight: bold;
    text-shadow: 0 0.1em 0.3em var(--color-shadow-heavy);
    letter-spacing: 0.05em;
}

#message-container {
    position: fixed;
    bottom: 2em;
    left: 50%;
    transform: translateX(-50%);
    z-index: 50;
    pointer-events: none;
}

#message-text {
    font-size: 1em;
    font-weight: bold;
    text-align: center;
    white-space: nowrap;
    padding: 0.6em 1.2em;
    border-radius: 0.5em;
    background-color: var(--color-bg-button);
    color: var(--color-text);
    box-shadow: 0 0.3em 0.8em var(--color-shadow-heavy);
    border: 0.1em solid var(--color-border);
    opacity: 0;
    transition: opacity 0.3s ease;
}

#message-text:not(:empty) {
    opacity: 1;
}

#game-info {
    position: absolute;
    top: 0.5em;
    right: 0.5em;
    font-size: 0.55em;
    color: var(--color-text);
    opacity: 0.5;
}
#game-info a {
    color: var(--color-text);
    text-decoration: none;
}
#game-info a:hover {
    text-decoration: underline;
}

/* Modal styles */
.modal {
    display: none;
    position: fixed;
    z-index: 100;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: var(--color-bg-modal-overlay);
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background-color: var(--color-bg-game);
    margin: 5% auto;
    padding: var(--spacing-lg);
    border: 0.1em solid var(--color-border);
    width: 90%;
    max-width: 50em;
    border-radius: var(--border-radius-lg);
    position: relative;
    box-shadow: 0 0.5em 2em var(--color-shadow-heavy);
    animation: slideDown 0.3s ease;
    contain: layout style paint;
}

@keyframes slideDown {
    from {
        transform: translateY(-2em);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@media (prefers-reduced-motion: reduce) {
    .modal {
        animation: none;
    }
    .modal-content {
        animation: none;
    }
}

.close-button {
    color: var(--color-text-grey);
    position: absolute;
    top: 0.5em;
    right: 0.8em;
    font-size: 2em;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.2s ease;
}

.close-button:hover,
.close-button:focus {
    color: var(--color-text);
    text-decoration: none;
}

/* Game UI styles */
.panel {
    width: 100%;
    margin-block-end: var(--spacing-sm);
    padding: 0.4em;
    border: 0.05em solid var(--color-border);
    border-radius: var(--border-radius-md);
    background: linear-gradient(135deg, var(--color-overlay-light) 0%, var(--color-overlay-dark) 100%);
    box-shadow: 0 0.15em 0.4em var(--color-shadow-light);
    overflow: hidden;
    flex-shrink: 0;
    contain: layout style;
}
.panel h3 {
    margin-top: 0;
    margin-bottom: 0.25em;
    color: var(--color-text);
    font-size: 0.9em;
    border-bottom: 0.06em solid var(--color-border);
    padding-bottom: 0.2em;
}

#game-area {
    flex: 1 1 auto;
    display: none;
    flex-direction: column;
    gap: var(--spacing-sm);
    min-height: 0;
    overflow: hidden;
}

#game-area.active {
    display: flex;
}

#top-bar {
    flex-shrink: 0;
    display: grid;
    grid-template-columns: auto auto auto 1fr auto;
    gap: 0.4em;
    align-items: center;
    padding: 0.4em;
    background: linear-gradient(135deg, var(--color-overlay-light) 0%, var(--color-overlay-dark) 100%);
    border: 0.08em solid var(--color-border);
    border-radius: var(--border-radius-md);
    contain: layout style;
}

#top-controls {
    display: flex;
    gap: var(--spacing-sm);
}

#scoreboard-panel {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    min-height: 0;
}

.players-inputs {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.4em;
}
.players-inputs input[type="text"] {
    padding: 0.4em 0.6em;
    border-radius: var(--border-radius-sm);
    border: 0.08em solid var(--color-border);
    background: var(--color-die-bg-light);
    color: var(--color-text);
    font-size: 0.9em;
    transition: all 0.2s ease;
}
.players-inputs input[type="text"]:focus {
    outline: none;
    border-color: var(--color-bg-highlight);
    background: var(--color-overlay-focus);
    box-shadow: 0 0 0.3em var(--color-bg-highlight);
}
.players-setup-controls {
    margin-top: 0.5em;
    display: flex;
    gap: 0.4em;
    flex-wrap: wrap;
}

#dice-container {
    display: flex;
    gap: 0.35em;
    align-items: center;
    justify-content: center;
}

#roll-button {
    white-space: nowrap;
    padding: 0.8em 1em;
    font-size: 0.9em;
    font-weight: bold;
}

#next-player-button, #new-game-button {
    padding: 0.9em 1em;
}

#turn-info {
    text-align: center;
    font-size: 1em;
    color: var(--color-text);
}

.die {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.8em;
    height: 2.8em;
    cursor: pointer;
    user-select: none;
    border: 0.15em solid var(--color-border);
    border-radius: var(--spacing-sm);
    background: linear-gradient(135deg, var(--color-die-bg) 0%, var(--color-die-bg-light) 100%);
    box-shadow: 0 0.2em 0.5em var(--color-shadow-medium);
    transition: all 0.2s ease;
    position: relative;
    contain: layout style paint;
}
.die svg {
    width: 100%;
    height: 100%;
    pointer-events: none;
}

/* Dice face patterns using radial gradients */
.die[data-value="0"]::before {
    content: '';
}

.die[data-value="1"] {
    background-image: 
        radial-gradient(circle at 50% 50%, var(--color-text) 8%, transparent 8%);
}

.die[data-value="2"] {
    background-image: 
        radial-gradient(circle at 30% 30%, var(--color-text) 8%, transparent 8%),
        radial-gradient(circle at 70% 70%, var(--color-text) 8%, transparent 8%);
}

.die[data-value="3"] {
    background-image: 
        radial-gradient(circle at 30% 30%, var(--color-text) 8%, transparent 8%),
        radial-gradient(circle at 50% 50%, var(--color-text) 8%, transparent 8%),
        radial-gradient(circle at 70% 70%, var(--color-text) 8%, transparent 8%);
}

.die[data-value="4"] {
    background-image: 
        radial-gradient(circle at 30% 30%, var(--color-text) 8%, transparent 8%),
        radial-gradient(circle at 70% 30%, var(--color-text) 8%, transparent 8%),
        radial-gradient(circle at 30% 70%, var(--color-text) 8%, transparent 8%),
        radial-gradient(circle at 70% 70%, var(--color-text) 8%, transparent 8%);
}

.die[data-value="5"] {
    background-image: 
        radial-gradient(circle at 30% 30%, var(--color-text) 8%, transparent 8%),
        radial-gradient(circle at 70% 30%, var(--color-text) 8%, transparent 8%),
        radial-gradient(circle at 50% 50%, var(--color-text) 8%, transparent 8%),
        radial-gradient(circle at 30% 70%, var(--color-text) 8%, transparent 8%),
        radial-gradient(circle at 70% 70%, var(--color-text) 8%, transparent 8%);
}

.die[data-value="6"] {
    background-image: 
        radial-gradient(circle at 30% 30%, var(--color-text) 8%, transparent 8%),
        radial-gradient(circle at 70% 30%, var(--color-text) 8%, transparent 8%),
        radial-gradient(circle at 30% 50%, var(--color-text) 8%, transparent 8%),
        radial-gradient(circle at 70% 50%, var(--color-text) 8%, transparent 8%),
        radial-gradient(circle at 30% 70%, var(--color-text) 8%, transparent 8%),
        radial-gradient(circle at 70% 70%, var(--color-text) 8%, transparent 8%);
}

.die:hover {
    box-shadow: 0 0.3em 0.6em var(--color-shadow-medium);
    filter: brightness(1.25);
}
.die.category-icon {
    cursor: default;
}
.die.category-icon:hover {
    box-shadow: 0 0.2em 0.5em var(--color-shadow-medium);
    filter: none;
}
.die.held {
    background-color: var(--color-bg-highlight);
    border-color: var(--color-bg-highlight);
    box-shadow: 0 0.3em 0.8em var(--color-highlight-glow), 0 0 0.8em var(--color-bg-highlight) inset;
}
.die.yatzy {
    animation: yatzyPulse 1s ease-in-out infinite;
}
@keyframes yatzyPulse {
    0%, 100% {
        box-shadow: 0 0.3em 0.8em var(--color-highlight-glow), 0 0 1em gold inset;
        border-color: gold;
        transform: scale(1);
    }
    50% {
        box-shadow: 0 0.5em 1em var(--color-highlight-glow), 0 0 1.5em gold inset;
        border-color: var(--color-bg-highlight);
        transform: scale(1.05);
    }
}
.die.rolling {
    animation: roll-dice var(--roll-animation-duration) ease-in-out infinite;
}
@keyframes roll-dice {
    0%, 100% { transform: rotate(0deg) scale(1); }
    25% { transform: rotate(90deg) scale(0.95); }
    50% { transform: rotate(180deg) scale(1); }
    75% { transform: rotate(270deg) scale(0.95); }
}

@media (prefers-reduced-motion: reduce) {
    .die {
        transition: none;
    }
    .die.rolling {
        animation: none;
    }
    .die.yatzy {
        animation: none;
        box-shadow: 0 0.3em 0.8em var(--color-highlight-glow), 0 0 1em gold inset;
        border-color: gold;
    }
    #scoreboard-table tbody td.placed-this-turn {
        animation: none;
    }
    #scoreboard-table td.suggested {
        animation: none;
    }
}

/* Scoreboard styles */

#scoreboard-container {
    flex: 1 1 auto;
    overflow: hidden;
    min-height: 0;
    display: block;
    height: 100%;
}
#scoreboard-table {
    width: 100%;
    height: 100%;
    border-collapse: collapse;
    box-shadow: 0 0.1em 0.3em var(--color-shadow-light);
    font-size: 0.95em;
}
#scoreboard-table th, #scoreboard-table td {
    border: 0.1em solid var(--color-border);
    padding: 0.3em 0.4em;
    text-align: center;
    vertical-align: middle;
    box-sizing: border-box;
    font-weight: 500;
    height: 2.2em;
}
#scoreboard-table .category-cell {
    width: 18%;
    min-width: 10em;
}
#scoreboard-table tbody tr:nth-child(even) {
    background-color: var(--color-overlay-row-even);
}
#scoreboard-table tbody tr:hover {
    background-color: var(--color-overlay-hover);
}
#scoreboard-table tbody tr:hover .category-cell {
    background-color: var(--color-overlay-category-hover);

}
#scoreboard-table tbody td {
    cursor: pointer;
}
#scoreboard-table tbody td:hover {
    background-color: var(--color-overlay-row-hover);
}
#scoreboard-table th {
    background-color: var(--color-bg-button);
    font-weight: bold;
    position: sticky;
    top: 0;
    z-index: 10;
}
#scoreboard-table tfoot th {
    background-color: var(--color-bg-tfoot);
    font-size: 1.1em;
    font-weight: bold;
}
.category-cell {
    text-align: left;
    font-weight: 500;
    font-size: 0.85em;
}
.category-cell-content {
    display: flex;
    align-items: center;
    gap: 0.3em;
    width: 100%;
}
.category-icon {
    width: 1.4em;
    height: 1.4em;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 0.08em solid var(--color-border);
    border-radius: 0.2em;
    background: var(--color-die-bg-light);
    flex-shrink: 0;
}
.score-hint {
    font-size: 0.8em;
    color: var(--color-text-grey);
    margin-left: auto;
    padding-left: var(--spacing-sm);
}
#scoreboard-table tbody td.clickable {
    cursor: pointer;
    position: relative;
}
#scoreboard-table tbody td.clickable:hover {
    background-color: var(--color-highlight-hover);
}
#scoreboard-table tbody td.clickable .score-hint {
    opacity: 0;
}
#scoreboard-table tbody td.clickable:hover .score-hint {
    opacity: 1;
}

#scoreboard-table tbody td.placed-this-turn {
    cursor: pointer;
    animation: scorePlace 0.5s ease;
    color: var(--color-text-dark);
    text-shadow: 0 0 0.2em var(--color-bg-highlight);
}

@keyframes scorePlace {
    0% {
        background-color: var(--color-bg-highlight);
        box-shadow: 0 0 0.8em var(--color-bg-highlight) inset;
    }
    100% {
        background-color: var(--color-highlight-placed);
        box-shadow: none;
    }
}

#scoreboard-table tbody td.placed-this-turn:hover {
    background-color: var(--color-highlight-red-hover);
}

/* Suggested category highlight when a roll has been made */
#scoreboard-table td.suggested {
    background-color: var(--color-highlight-suggested);
    box-shadow: 0 0 0.4em var(--color-bg-highlight) inset;
    animation: suggestPulse 2s ease-in-out infinite;
}

@keyframes suggestPulse {
    0%, 100% {
        box-shadow: 0 0 0.4em var(--color-bg-highlight) inset;
    }
    50% {
        box-shadow: 0 0 0.8em var(--color-bg-highlight) inset;
    }
}

/* Winner modal styling */
#winner-modal .modal-content {
    max-width: 35em;
    text-align: center;
}

#winner-modal h2 {
    font-size: 1.8em;
    margin-top: 0;
    color: var(--color-bg-highlight);
}

#winner-content {
    margin: var(--spacing-md) 0;
}

#winner-content p {
    font-size: 1.1em;
    line-height: 1.4;
}

#winner-content table {
    margin: var(--spacing-md) auto;
    border: 0.1em solid var(--color-border);
}

#winner-content table tr {
    border-bottom: 0.05em solid var(--color-border);
}

#winner-content table tr:last-child {
    border-bottom: none;
}

#winner-content table tr:hover {
    background-color: var(--color-overlay-hover);
}

#winner-content table td {
    font-size: 1em;
}