:root {
    --blue1: #48e3fb;
    --blue2: #00b6ff;
    --blue3: #00a3fe;
    --blue4: #0480ff;
    --blue5: #0057fe;

    --purple1: #643efe;
    --purple2: #5e50ff;
    --purple3: #5765ff;
    --purple4: #5177fe;
    --purple5: #5081ff;
    --purple6: #479afe;
    --purple7: #2929d6;

    /* Apple-style glass effect colors */
    --glass-bg: rgba(20, 22, 42, 0.5);
    --glass-border: rgba(255, 255, 255, 0.12);
    --glass-highlight: rgba(255, 255, 255, 0.05);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.15);

    /* Text colors with better readability */
    --main-dark: #15172a;
    --text-main: #ffffff;
    --text-sub: #e1e3eb;
    --text-muted: #9ba1b9;

    --text-highlight: linear-gradient(45deg, var(--purple1), var(--purple3));
    
    /* Theme Mapping */
    --bg-color: var(--main-dark);
    --primary-color: var(--glass-bg);
    --secondary-color: var(--purple6);
    --accent-color: var(--purple2);
    --text-color: var(--text-main);
    --light-square-bg: #f0d9b5;
    --dark-square-bg: #b58863;
    --border-color: var(--glass-border);
    --shadow-color: var(--glass-shadow);
}

@keyframes skeleton-pulse {
    0% {
        background-color: rgba(255, 255, 255, 0.08);
    }
    50% {
        background-color: rgba(255, 255, 255, 0.15);
    }
    100% {
        background-color: rgba(255, 255, 255, 0.08);
    }
}

@keyframes animated-border-glow {
    0% {
        border-color: var(--purple2);
        box-shadow: 0 0 10px var(--purple2);
    }
    33% {
        border-color: var(--blue2);
        box-shadow: 0 0 15px var(--blue2);
    }
    66% {
        border-color: var(--purple5);
        box-shadow: 0 0 10px var(--purple5);
    }
    100% {
        border-color: var(--purple2);
        box-shadow: 0 0 10px var(--purple2);
    }
}

.skeleton {
    animation: skeleton-pulse 1.5s infinite ease-in-out;
    color: transparent !important;
    user-select: none;
}

#bot-avatar-container {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    overflow: hidden;
    position: relative;
    border: 3px solid var(--accent-color);
    box-shadow: 0 0 10px var(--accent-color);
    transition: border-color 0.5s ease, box-shadow 0.5s ease;
    animation: animated-border-glow 4s linear infinite;
}

#bot-avatar-container.skeleton {
    border-color: transparent !important;
    box-shadow: none !important;
    background-color: rgba(255, 255, 255, 0.08);
}

#bot-avatar-container.skeleton img {
    visibility: hidden; /* hide alt text */
}

.skeleton-text {
    border-radius: 5px;
    height: 1.2em;
    width: 60%;
}

.skeleton-bubble {
    border-radius: 15px;
    height: 4em;
    width: 100%;
}

button.skeleton {
    border-color: transparent !important;
    box-shadow: none !important;
    background: var(--glass-bg) !important;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    min-height: 100vh;
}

.container {
    display: grid;
    grid-template-areas:
        "header header"
        "game controls"
        "game controls";
    grid-template-columns: 1fr 340px;
    grid-template-rows: auto 1fr;
    gap: 30px;
    width: 100%;
    max-width: 1200px;
}

header {
    grid-area: header;
    text-align: center;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    margin-bottom: 20px;
}

header h1 {
    margin: 0;
    font-weight: 600;
    background: var(--text-highlight);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.setup-item {
    margin: 10px 0;
}

/* Engine Status Hidden */
.engine-status-container {
    display: none;
}

.game-area {
    grid-area: game;
    display: flex;
    align-items: center;
    justify-content: center;
}

#evaluation-bar-container {
    width: 20px;
    height: clamp(300px, 80vmin, 600px);
    background-color: var(--primary-color);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    display: flex;
    flex-direction: column-reverse; /* White's advantage at the bottom */
    margin-right: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-color);
    position: relative;
}

#evaluation-bar {
    width: 100%;
    background: linear-gradient(180deg, var(--blue1), var(--blue3));
    transition: height 0.5s ease;
    height: 50%; /* Start at 50% for an equal position */
    box-shadow: 0 0 15px var(--blue2);
}

#evaluation-score {
    position: absolute;
    bottom: 5px;
    left: 50%;
    transform: translateX(-50%);
    color: white;
    font-size: 12px;
    font-weight: bold;
    text-shadow: 1px 1px 2px black;
    z-index: 2;
    text-orientation: mixed;
}

#board-wrapper {
    position: relative;
    width: clamp(300px, 80vmin, 600px);
    height: clamp(300px, 80vmin, 600px);
}

#board {
    position: absolute;
    top: 0;
    left: 0;
    display: grid;
    grid-template-columns: repeat(8, 12.5%);
    grid-template-rows: repeat(8, 12.5%);
    width: 100%;
    height: 100%;
    border: 5px solid var(--glass-bg);
    box-shadow: var(--shadow-color);
    border-radius: 10px;
    overflow: hidden;
}

.coords {
    position: absolute;
    color: var(--text-main);
    font-size: clamp(10px, 1.5vmin, 14px);
    font-weight: 600;
    pointer-events: none;
    text-shadow: 0 1px 3px rgba(0,0,0,0.5);
    z-index: 1;
}

.coords.ranks {
    top: 2px;
    left: 2px;
}

.coords.files {
    bottom: 2px;
    right: 2px;
}

.square.light .coords {
    color: var(--dark-square-bg);
}

.square.dark .coords {
    color: var(--light-square-bg);
}

/* .is-flipped .coords.ranks {
    left: auto;
    right: 2px;
} */

.is-flipped .coords.files {
    right: auto;
    left: 2px;
}

.square {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.square.light {
    background-color: var(--light-square-bg);
}

.square.dark {
    background-color: var(--dark-square-bg);
}

.square.selected {
    background-color: rgba(129, 182, 76, 0.7);
}
.valid-move-dot {
    position: absolute;
    width: 25%;
    height: 25%;
    background-color: rgba(40, 40, 40, 0.4);
    border-radius: 50%;
    pointer-events: none; /* So it doesn't interfere with clicks */
}

.piece {
    width: 85%;
    height: 85%;
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    cursor: grab;
    transition: transform 0.1s ease;
    filter: drop-shadow(0 2px 3px rgba(0,0,0,0.3));
}

.piece.dragging {
    opacity: 0.5;
    cursor: grabbing;
    transform: scale(1.15);
}

.bot-card {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.bot-profile {
    display: flex;
    align-items: center;
    gap: 15px;
    text-align: left;
    margin-bottom: 0;
    width: 100%; /* Added to allow margin-left: auto to work */
}

#play-bot-btn {
    margin-left: auto;
}

#bot-avatar {
    width: 100%;
    height: 100%;
    vertical-align: top;
    opacity: 0;
    transition: opacity 0.4s ease-in-out;
}

#bot-avatar.loaded {
    opacity: 1;
}

#bot-name {
    margin: 0;
    font-weight: 600;
    font-size: 1.2em;
}

#elo-badge {
    background-color: var(--accent-color);
    color: #fff;
    padding: 3px 8px;
    border-radius: 8px;
    font-size: 0.7em;
    font-weight: 600;
    margin-left: 8px;
    vertical-align: middle;
    box-shadow: 0 0 8px var(--accent-color);
}

.bot-chat-bubble {
    background-color: #4a4a4a;
    padding: 12px 15px;
    border-radius: 15px;
    margin-bottom: 20px;
    position: relative;
    width: 100%;
    box-sizing: border-box;
}

.bot-chat-bubble::before {
    content: '';
    position: absolute;
    bottom: 100%;
    left: 25px;
    border-width: 10px;
    border-style: solid;
    border-color: transparent transparent #4a4a4a transparent;
}

.actions-card {
    flex-direction: row;
    justify-content: flex-start;
    align-items: center;
    gap: 15px;
}

.move-navigation {
    display: none;
    gap: 10px;
    margin-left: auto;
}

#prev-move-btn,
#next-move-btn {
    padding: 8px;
    min-width: 40px;
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-sub);
    border-radius: 12px;
    transition: all 0.2s ease;
}

#prev-move-btn:not(:disabled):hover,
#next-move-btn:not(:disabled):hover {
    background: var(--accent-color);
    border-color: var(--purple1);
    box-shadow: 0 0 10px var(--accent-color);
    color: #fff;
}

#prev-move-btn:disabled,
#next-move-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background: var(--glass-bg);
    box-shadow: none;
}

#flip-board-btn, #play-bot-btn, #share-btn, #play-again-btn, #copy-link-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 15px;
    border: 1px solid var(--border-color);
    background: var(--glass-bg);
    color: var(--text-main);
    cursor: pointer;
    border-radius: 15px;
    font-size: 0.9em;
    font-weight: 600;
    transition: all 0.2s ease;
    -webkit-backdrop-filter: blur(2px);
    backdrop-filter: blur(2px);
}

#flip-board-btn, #play-bot-btn, #share-btn {
    width: auto;
    flex-grow: 0;
}

#flip-board-btn:disabled {
    display: none;
}

#play-again-btn, #copy-link-btn {
    width: 100%;
}

#flip-board-btn:hover, #play-bot-btn:hover, #play-again-btn:hover, #share-btn:hover, #copy-link-btn:hover {
    background: var(--accent-color);
    border-color: var(--purple1);
    box-shadow: 0 0 15px var(--accent-color);
    color: #fff;
}

.controls-area {
    grid-area: controls;
    display: flex;
    flex-direction: column;
    gap: 20px;
    min-width: 320px;
}

.control-card {
    background-color: var(--primary-color);
    padding: 20px;
    border-radius: 15px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-color);
}

#controls {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.control-group label {
    font-weight: 400;
    color: var(--text-sub);
}

#new-game-btn {
    padding: 12px 20px;
    border: none;
    background-color: var(--accent-color);
    color: #fff;
    cursor: pointer;
    border-radius: 5px;
    font-size: 1em;
    font-weight: 600;
    transition: background-color 0.2s ease;
}

#new-game-btn:hover {
    background-color: #6a9a3c;
}

#fen-input {
    padding: 10px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-color);
    color: var(--text-color);
    border-radius: 5px;
    width: 100%;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

#pgn-input {
    padding: 10px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-color);
    color: var(--text-color);
    border-radius: 5px;
    width: 100%;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
    resize: vertical;
    min-height: 80px;
}

#analyze-pgn-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 15px;
    border: 1px solid var(--border-color);
    background: var(--glass-bg);
    color: var(--text-main);
    cursor: pointer;
    border-radius: 15px;
    font-size: 0.9em;
    font-weight: 600;
    transition: all 0.2s ease;
    -webkit-backdrop-filter: blur(2px);
    backdrop-filter: blur(2px);
    width: 100%;
}

#analyze-pgn-btn:hover {
    background: var(--accent-color);
    border-color: var(--purple1);
    box-shadow: 0 0 15px var(--accent-color);
    color: #fff;
}

#elo-controls {
    gap: 15px;
}

.elo-checkbox-wrapper {
    display: flex;
    align-items: center;
    gap: 10px;
}

#elo-limit-checkbox {
    width: 18px;
    height: 18px;
    accent-color: var(--accent-color);
}

.elo-slider-wrapper {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

#elo-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 8px;
    background: rgba(0,0,0,0.3);
    outline: none;
    border-radius: 5px;
    opacity: 0.7;
    transition: opacity .2s;
}

#elo-slider:hover {
    opacity: 1;
}

#elo-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  background: var(--accent-color);
  cursor: pointer;
  border-radius: 50%;
  border: 2px solid #fff;
  box-shadow: 0 0 5px var(--accent-color);
}

#elo-slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  background: var(--accent-color);
  cursor: pointer;
  border-radius: 50%;
  border: 2px solid #fff;
  box-shadow: 0 0 5px var(--accent-color);
}

#elo-slider:disabled {
    opacity: 0.4;
}

#elo-slider:disabled::-webkit-slider-thumb {
    background: var(--secondary-color);
}
#elo-slider:disabled::-moz-range-thumb {
    background: var(--secondary-color);
}

#status-message {
    font-weight: 400;
    margin: 0;
    font-size: 0.9em;
    color: var(--text-sub);
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.modal-overlay.hidden {
    display: none;
}

.modal-content {
    background: var(--primary-color);
    padding: 30px;
    border-radius: 15px;
    border: 1px solid var(--glass-border);
    box-shadow: 0 10px 40px rgba(0,0,0,0.3);
    text-align: center;
    position: relative;
    width: 90%;
    max-width: 400px;
}

.analysis-modal-content {
    max-width: 600px;
    text-align: left;
}

#analysis-results {
    max-height: 70vh;
    overflow-y: auto;
    padding-right: 15px;
}

#analysis-results h2 {
    text-align: center;
}

.analysis-summary {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.accuracy-score {
    text-align: center;
}

.accuracy-score .score {
    font-size: 2em;
    font-weight: 600;
}

.move-analysis-item {
    display: flex;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid var(--glass-border);
}

.move-number {
    width: 40px;
    color: var(--text-muted);
}

.move-notation {
    flex-grow: 1;
    font-weight: 600;
}

.move-classification-icon {
    width: 30px;
    height: 30px;
    margin: 0 10px;
}

.move-classification-text {
    width: 80px;
    font-size: 0.9em;
}


.modal-content h2 {
    margin-top: 0;
    margin-bottom: 20px;
    background: var(--text-highlight);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.close-btn {
    position: absolute;
    top: 10px;
    right: 15px;
    background: transparent;
    border: none;
    font-size: 2rem;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0;
    line-height: 1;
}

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

#share-link-input {
    width: calc(100% - 20px);
    padding: 10px;
    margin: 10px 0 15px 0;
    border: 1px solid var(--border-color);
    background-color: var(--bg-color);
    color: var(--text-sub);
    border-radius: 5px;
    font-family: 'Poppins', sans-serif;
    box-sizing: border-box;
}

/* Responsive Design */
@media (max-width: 900px) {
    .container {
        grid-template-areas:
            "header"
            "game"
            "controls";
        grid-template-columns: 1fr;
        gap: 20px;
        padding: 0 15px;
    }

    .footer-content {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .game-area {
        flex-direction: column;
        align-items: center;
        width: 100%;
    }

    .actions-card {
        order: -1; /* Move actions card to the top */
    }

    .move-navigation {
        grid-area: nav;
        justify-content: center;
        gap: 1rem;
        width: 100%;
    }

    #board-wrapper {
        width: 100%;
        height: auto;
        padding-bottom: 100%; /* Maintain 1:1 aspect ratio */
        max-width: none;
        max-height: none;
    }

    #board {
        width: 100%;
        height: 100%;
    }
    
    #evaluation-bar-container {
        width: 100%;
        height: 15px;
        flex-direction: row; /* Horizontal bar */
        margin-right: 0;
        margin-bottom: 15px;
        order: -1; /* Show above the board */
    }

    #evaluation-bar {
        height: 100%;
        width: 50%; /* Start at 50% */
        transition: width 0.5s ease;
    }

    #evaluation-score {
        writing-mode: horizontal-tb;
        bottom: auto;
        top: 50%;
        left: 10px;
        transform: translateY(-50%);
    }

    .controls-area {
        grid-area: controls;
        width: 100%;
        max-width: none;
    }
}

@media (max-width: 480px) {
    body {
        padding: 10px;
    }
    header h1 {
        font-size: 1.8em;
    }
}

.site-footer {
    background-color: var(--primary-color);
    padding: 40px 20px;
    border-top: 1px solid var(--border-color);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    width: 100%;
    max-width: 1200px;
    box-sizing: border-box;
    border-radius: 15px;
    box-shadow: var(--shadow-color);
    margin-top: 40px;
}

.footer-content {
    display: flex;
    justify-content: space-around;
    gap: 40px;
    margin: 0 auto 30px;
    flex-wrap: wrap;
}

.footer-section {
    flex: 1;
    min-width: 300px;
}

.footer-section h2 {
    font-weight: 600;
    background: var(--text-highlight);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 10px;
    margin-bottom: 20px;
    display: inline-block;
}

.footer-section p {
    color: var(--text-sub);
    line-height: 1.6;
}

.footer-section ul {
    list-style: none;
    padding: 0;
}

.footer-section ul li {
    color: var(--text-sub);
    margin-bottom: 10px;
    line-height: 1.6;
    position: relative;
    padding-left: 25px;
}

.footer-section ul li::before {
    content: '⚡';
    position: absolute;
    left: 0;
    top: 0;
    color: var(--accent-color);
}

.footer-section ul li strong {
    color: var(--text-main);
}

.footer-bottom {
    text-align: center;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
}