/* Design Tokens */
:root {
    --bg: #f2f2f2;
    --outline: #000000;
    --player1: #e63946;
    --player2: #ffd60a;
    --accent: #00b4d8;
    --panel-bg: #ffffff;
    --shadow-offset: 4px;
    --border-thick: 3px;
    --board-width-max: 900px;
    --text-color: #000000;
    
    /* Colorblind mode colors */
    --player1-alt: #ff6b6b;
    --player2-alt: #4ecdc4;
    
    /* High contrast */
    --high-contrast-bg: #ffffff;
    --high-contrast-outline: #000000;
    
    /* Dark mode colors */
    --dark-bg: #1a1a1a;
    --dark-panel-bg: #2d2d2d;
    --dark-outline: #ffffff;
    --dark-text: #ffffff;
    --dark-accent: #00d4ff;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
    -webkit-touch-callout: none;
}

/* Prevent text selection on game elements */
.board-svg-container,
.btn,
.ai-face,
.modal-overlay {
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    transition: background-color 0.3s, color 0.3s;
}

#app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    background-color: var(--panel-bg);
    border-bottom: var(--border-thick) solid var(--outline);
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 var(--shadow-offset) 0 var(--outline);
}

.title {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.header-controls {
    display: flex;
    gap: 1rem;
}

/* Buttons */
.btn {
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    border: var(--border-thick) solid var(--outline);
    background-color: var(--panel-bg);
    color: var(--outline);
    cursor: pointer;
    transition: transform 0.1s, box-shadow 0.1s;
    box-shadow: var(--shadow-offset) var(--shadow-offset) 0 var(--outline);
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.btn:hover:not(:disabled) {
    transform: translate(2px, 2px);
    box-shadow: 2px 2px 0 var(--outline);
}

.btn:active:not(:disabled) {
    transform: translate(var(--shadow-offset), var(--shadow-offset));
    box-shadow: 0 0 0 var(--outline);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background-color: var(--accent);
    color: var(--panel-bg);
}

.btn-secondary {
    background-color: var(--panel-bg);
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-danger {
    background-color: var(--player1);
    color: var(--panel-bg);
}

/* Main Content */
.main-content {
    flex: 1;
    display: grid;
    grid-template-columns: 250px 1fr 300px;
    gap: 2rem;
    padding: 2rem;
    max-width: 1600px;
    margin: 0 auto;
    width: 100%;
}

/* Side Panels */
.side-panel {
    background-color: var(--panel-bg);
    border: var(--border-thick) solid var(--outline);
    padding: 1.5rem;
    box-shadow: var(--shadow-offset) var(--shadow-offset) 0 var(--outline);
    height: fit-content;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.panel-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.btn-close {
    background: none;
    border: none;
    font-size: 2rem;
    line-height: 1;
    cursor: pointer;
    padding: 0.25rem 0.5rem;
    color: var(--outline);
    transition: transform 0.2s;
    display: none;
}

.btn-close:hover {
    transform: scale(1.2);
}

.btn-close:active {
    transform: scale(0.9);
}

/* AI Face Box */
.ai-face-box {
    background-color: var(--panel-bg);
    border: var(--border-thick) solid var(--outline);
    padding: 2rem;
    text-align: center;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-offset) var(--shadow-offset) 0 var(--outline);
    position: relative;
}

.ai-face {
    font-size: 4rem;
    margin-bottom: 1rem;
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    display: inline-block;
}

.ai-face-box:hover .ai-face {
    transform: scale(1.1);
}

.ai-text {
    font-size: 1rem;
    font-weight: 600;
    font-style: italic;
    color: var(--outline);
    min-height: 1.5rem;
    transition: opacity 0.3s;
}

.ai-text::before {
    content: '"';
}

.ai-text::after {
    content: '"';
}

/* Game Controls */
.game-controls {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.difficulty-selector {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.select {
    font-family: 'Poppins', sans-serif;
    padding: 0.5rem;
    border: var(--border-thick) solid var(--outline);
    background-color: var(--panel-bg);
    font-weight: 600;
    cursor: pointer;
    box-shadow: 2px 2px 0 var(--outline);
}

.select:focus {
    outline: 3px solid var(--accent);
    outline-offset: 2px;
}

.select-small {
    padding: 0.375rem 0.5rem;
    font-size: 0.875rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-weight: 600;
}

.checkbox-label input[type="checkbox"] {
    width: 1.25rem;
    height: 1.25rem;
    cursor: pointer;
    accent-color: var(--accent);
}

.accessibility-controls {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 0.5rem;
}

/* Board Container */
.board-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.board-svg-container {
    background-color: var(--panel-bg);
    border: var(--border-thick) solid var(--outline);
    padding: 1.5rem;
    box-shadow: var(--shadow-offset) var(--shadow-offset) 0 var(--outline);
    max-width: var(--board-width-max);
    width: 100%;
    position: relative;
    outline: none;
}

.board-svg-container:focus {
    outline: 3px solid var(--accent);
    outline-offset: 4px;
}

.board-svg-container svg {
    width: 100%;
    height: auto;
    display: block;
}

.game-status {
    font-size: 1.25rem;
    font-weight: 700;
    text-align: center;
    min-height: 2rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Disc Animation */
.disc {
    transition: transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
    transform-origin: center;
}

.disc.dropping {
    animation: dropDisc 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

@keyframes dropDisc {
    0% {
        transform: translateY(-100px) scale(0.8);
        opacity: 0.8;
    }
    60% {
        transform: translateY(10px) scale(1.05);
    }
    100% {
        transform: translateY(0) scale(1);
        opacity: 1;
    }
}

.disc.winning {
    animation: pulseWin 1s ease-in-out infinite;
}

@keyframes pulseWin {
    0%, 100% {
        filter: drop-shadow(0 0 8px currentColor);
        transform: scale(1);
    }
    50% {
        filter: drop-shadow(0 0 16px currentColor);
        transform: scale(1.1);
    }
}

/* Column Hover Effect */
.column-zone {
    cursor: pointer;
    transition: opacity 0.2s;
}

.column-zone:hover {
    opacity: 0.7;
}

.column-zone.disabled {
    cursor: not-allowed;
    opacity: 0.3;
}

.column-zone.keyboard-focus {
    fill: rgba(0, 180, 216, 0.2);
    stroke: var(--accent);
    stroke-width: 3;
}

/* History Panel */
.history-list {
    max-height: 600px;
    overflow-y: auto;
    margin-bottom: 1rem;
}

.history-item {
    background-color: var(--bg);
    border: 2px solid var(--outline);
    padding: 1rem;
    margin-bottom: 0.75rem;
    cursor: pointer;
    transition: transform 0.1s, box-shadow 0.1s;
    box-shadow: 2px 2px 0 var(--outline);
}

.history-item:hover {
    transform: translate(2px, 2px);
    box-shadow: 1px 1px 0 var(--outline);
}

.history-item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.history-item-date {
    font-size: 0.875rem;
    color: #666;
}

.history-item-details {
    font-size: 0.875rem;
    margin-top: 0.5rem;
    display: none;
}

.history-item.expanded .history-item-details {
    display: block;
}

/* Console Panel */
.console-panel {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 400px;
    background-color: var(--panel-bg);
    border-top: var(--border-thick) solid var(--outline);
    box-shadow: 0 calc(-1 * var(--shadow-offset)) var(--shadow-offset) var(--outline);
    display: flex;
    flex-direction: column;
    z-index: 1000;
}

.console-header {
    padding: 1rem 1.5rem;
    border-bottom: var(--border-thick) solid var(--outline);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--bg);
}

.console-controls {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.console-content {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
}

.console-entry {
    padding: 0.5rem;
    margin-bottom: 0.25rem;
    border-left: 3px solid var(--outline);
    padding-left: 0.75rem;
    animation: slideIn 0.2s ease-out;
    display: flex;
    gap: 0.5rem;
    align-items: flex-start;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-10px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.console-entry-type {
    font-weight: 700;
    min-width: 80px;
    text-transform: uppercase;
    font-size: 0.75rem;
}

.console-entry-time {
    color: #666;
    font-size: 0.75rem;
    min-width: 80px;
}

.console-entry-message {
    flex: 1;
}

.console-entry[data-type="info"] {
    border-left-color: var(--accent);
}

.console-entry[data-type="ai"] {
    border-left-color: var(--player2);
    background-color: rgba(255, 214, 10, 0.1);
}

.console-entry[data-type="player"] {
    border-left-color: var(--player1);
    background-color: rgba(230, 57, 70, 0.1);
}

.console-entry[data-type="success"] {
    border-left-color: #06d6a0;
}

.console-entry[data-type="warning"] {
    border-left-color: #ffb627;
}

.console-entry[data-type="error"] {
    border-left-color: var(--player1);
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    animation: fadeIn 0.2s;
}

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

.modal-content {
    background-color: var(--panel-bg);
    border: var(--border-thick) solid var(--outline);
    padding: 2rem;
    box-shadow: var(--shadow-offset) var(--shadow-offset) 0 var(--outline);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideUp 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.modal-large {
    max-width: 900px;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(50px) scale(0.9);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.modal-title {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.new-game-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.875rem;
}

.form-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 1rem;
}

/* Replay Controls */
.replay-board-container {
    margin-bottom: 1.5rem;
    min-height: 400px;
}

.replay-controls {
    display: flex;
    gap: 1rem;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.replay-speed {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.replay-speed input[type="range"] {
    width: 150px;
}

.replay-timeline {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    padding: 1rem;
    background-color: var(--bg);
    border: 2px solid var(--outline);
    max-height: 150px;
    overflow-y: auto;
}

.timeline-move {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid var(--outline);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    font-size: 0.75rem;
    font-weight: 700;
}

.timeline-move:hover {
    transform: scale(1.1);
    box-shadow: 2px 2px 0 var(--outline);
}

.timeline-move.active {
    box-shadow: 0 0 0 3px var(--accent);
    transform: scale(1.15);
}

.timeline-move.player1 {
    background-color: var(--player1);
    color: var(--panel-bg);
}

.timeline-move.player2 {
    background-color: var(--player2);
    color: var(--outline);
}

/* Colorblind Mode */
body.colorblind .player1-disc {
    fill: var(--player1-alt) !important;
}

body.colorblind .player2-disc {
    fill: var(--player2-alt) !important;
}

body.colorblind .timeline-move.player1 {
    background-color: var(--player1-alt);
}

body.colorblind .timeline-move.player2 {
    background-color: var(--player2-alt);
}

/* High Contrast Mode */
body.high-contrast {
    --bg: var(--high-contrast-bg);
    --panel-bg: var(--high-contrast-bg);
    --outline: var(--high-contrast-outline);
}

body.high-contrast .btn {
    border-width: 4px;
}

body.high-contrast .board-svg-container {
    border-width: 4px;
}

/* Dark Mode */
body.dark-mode {
    --bg: var(--dark-bg);
    --panel-bg: var(--dark-panel-bg);
    --outline: var(--dark-outline);
    --text-color: var(--dark-text);
    --accent: var(--dark-accent);
}

body.dark-mode .board-svg-container {
    background-color: var(--dark-panel-bg);
}

.board-bg {
    fill: #f2f2f2;
    stroke: #000;
}

body.dark-mode .board-bg {
    fill: #2d2d2d;
    stroke: #ffffff;
}

.board-cell {
    fill: #ffffff;
    stroke: #000;
}

body.dark-mode .board-cell {
    fill: #1a1a1a;
    stroke: #ffffff;
}

.disc {
    stroke: #000;
}

body.dark-mode .disc {
    stroke: #ffffff;
}

body.dark-mode .history-item {
    background-color: var(--dark-bg);
    color: var(--dark-text);
}

body.dark-mode .console-entry-time {
    color: #999;
}

body.dark-mode .ai-text {
    color: var(--dark-text);
}

body.dark-mode .game-status {
    color: var(--dark-text);
}

body.dark-mode .select,
body.dark-mode .btn {
    color: var(--text-color);
}

body.dark-mode .btn-primary {
    color: #000000;
}

body.dark-mode .timeline-move {
    color: #000000;
}

body.dark-mode .replay-timeline {
    background-color: var(--dark-bg);
}

/* Responsive */
@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: 200px 1fr;
    }
    
    /* Make history panel appear as overlay on smaller screens */
    .right-panel {
        display: none;
        position: fixed;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        z-index: 1500;
        max-width: 90%;
        width: 400px;
        max-height: 80vh;
        overflow-y: auto;
        box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
    }
    
    /* Add backdrop when history is shown */
    .right-panel[style*="display: block"]::before {
        content: '';
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: -1;
    }
    
    /* Show close button on tablets too */
    .right-panel .btn-close {
        display: block;
    }
}

@media (max-width: 768px) {
    .main-content {
        grid-template-columns: 1fr;
        padding: 1rem;
        gap: 1rem;
    }
    
    .header {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }
    
    .title {
        font-size: 1.75rem;
    }
    
    .header-controls {
        flex-wrap: wrap;
        justify-content: center;
        width: 100%;
    }
    
    .header-controls .btn {
        flex: 1;
        min-width: 100px;
        padding: 0.875rem 1rem;
        font-size: 0.875rem;
    }
    
    /* History panel as full-screen overlay on mobile */
    .right-panel {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        width: 100%;
        max-width: 100%;
        max-height: 100vh;
        transform: none;
        z-index: 2000;
        margin: 0;
        padding: 1.5rem;
    }
    
    /* Show close button on mobile */
    .right-panel .btn-close {
        display: block;
    }
    
    .side-panel {
        order: 2;
        padding: 1rem;
    }
    
    .board-container {
        order: 1;
    }
    
    .ai-face-box {
        padding: 1rem;
        margin-bottom: 1rem;
    }
    
    .ai-face {
        font-size: 3rem;
    }
    
    .ai-text {
        font-size: 0.875rem;
    }
    
    .game-status {
        font-size: 1rem;
    }
    
    .board-svg-container {
        padding: 0.75rem;
    }
    
    /* Larger touch targets for mobile */
    .btn {
        min-height: 44px;
        padding: 0.875rem 1.25rem;
    }
    
    .btn-small {
        min-height: 40px;
        padding: 0.625rem 1rem;
    }
    
    /* Mobile console */
    .console-panel {
        height: 300px;
    }
    
    .console-header {
        padding: 0.75rem 1rem;
        flex-direction: column;
        gap: 0.75rem;
        align-items: stretch;
    }
    
    .console-controls {
        justify-content: space-between;
    }
    
    .console-content {
        font-size: 0.75rem;
        padding: 0.75rem;
    }
    
    /* Mobile modal */
    .modal-content {
        width: 95%;
        padding: 1rem;
        max-height: 90vh;
    }
    
    .modal-title {
        font-size: 1.25rem;
        margin-bottom: 1rem;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .form-actions .btn {
        width: 100%;
    }
    
    /* Replay modal - more compact on mobile */
    .modal-large {
        max-width: 95%;
        padding: 0.75rem;
    }
    
    .replay-board-container {
        min-height: auto;
        margin-bottom: 0.75rem;
    }
    
    /* Replay controls mobile */
    .replay-controls {
        flex-wrap: wrap;
        gap: 0.5rem;
        margin-bottom: 0.75rem;
        justify-content: space-between;
    }
    
    .replay-controls .btn {
        flex: 1;
        min-width: 80px;
        padding: 0.5rem;
        font-size: 0.75rem;
    }
    
    .replay-speed {
        width: 100%;
        justify-content: space-between;
        order: 10;
    }
    
    .replay-speed label {
        font-size: 0.875rem;
    }
    
    .replay-speed input[type="range"] {
        flex: 1;
        max-width: 150px;
    }
    
    #replay-speed-value {
        font-size: 0.875rem;
        min-width: 40px;
    }
    
    #btn-close-replay {
        width: 100%;
        order: 11;
    }
    
    .replay-timeline {
        max-height: 100px;
        padding: 0.5rem;
    }
    
    .timeline-move {
        width: 32px;
        height: 32px;
        font-size: 0.7rem;
    }
    
    /* Mobile history */
    .history-list {
        max-height: 400px;
    }
    
    /* Better spacing for accessibility controls */
    .accessibility-controls {
        gap: 1rem;
    }
    
    .checkbox-label {
        font-size: 0.875rem;
    }
}

@media (max-width: 480px) {
    .title {
        font-size: 1.5rem;
        letter-spacing: 0.05em;
    }
    
    .header-controls {
        flex-direction: column;
        width: 100%;
    }
    
    .header-controls .btn {
        width: 100%;
    }
    
    .ai-face {
        font-size: 2.5rem;
    }
    
    .panel-title {
        font-size: 1.25rem;
    }
    
    .board-svg-container {
        padding: 0.5rem;
    }
    
    /* Stack everything vertically on very small screens */
    .game-controls {
        gap: 0.75rem;
    }
    
    .console-panel {
        height: 250px;
    }
    
    /* Even more compact replay on small phones */
    .modal-large {
        padding: 0.5rem;
    }
    
    .modal-title {
        font-size: 1.1rem;
        margin-bottom: 0.75rem;
    }
    
    .replay-controls .btn {
        padding: 0.4rem;
        font-size: 0.7rem;
        min-width: 70px;
    }
    
    .replay-timeline {
        max-height: 80px;
    }
    
    .timeline-move {
        width: 28px;
        height: 28px;
        font-size: 0.65rem;
    }
}

/* Focus Indicators */
*:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 2px;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 12px;
    height: 12px;
}

::-webkit-scrollbar-track {
    background: var(--bg);
    border: 2px solid var(--outline);
}

::-webkit-scrollbar-thumb {
    background: var(--accent);
    border: 2px solid var(--outline);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--player1);
}