/* Custom Styles - Overrides and fine-tuning Tailwind for dark, minimalist theme */
body {
    font-family: 'Rubik', sans-serif;
    background-color: #050711; /* Very dark blue, almost black */
    color: #E0FBFC; /* Light Blue/Cyan for general text */
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    overflow-y: auto; /* Allow scrolling on body if content exceeds viewport */
    -webkit-font-smoothing: antialiased; /* Better font rendering */
    -moz-osx-font-smoothing: grayscale; /* Better font rendering */
    transition: background-color 0.3s ease-in-out, color 0.3s ease-in-out;
}

/* App Container */
.app-container {
    background-color: #0F172A; /* Darker slate blue */
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.7);
    max-width: 450px; /* Constrain max width for 3x3 board */
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 25px;
    border: 1px solid #1E293B; /* Subtle border */
    position: relative; /* For absolutely positioned notifications */
    min-height: 600px; /* Ensure a minimum height for consistent layout */
}

/* View Management */
.view {
    display: none;
    flex-direction: column;
    gap: 25px;
}
.view.active {
    display: flex;
}
.view.hidden {
    display: none;
}

/* Main Menu & Game Setup Buttons */
.menu-buttons button,
.modal-content button.menu-button {
    background-color: #6366F1; /* Indigo-500 */
    color: white;
    padding: 12px 25px;
    border-radius: 10px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    font-size: 1.1em;
}
.menu-buttons button:hover,
.modal-content button.menu-button:hover {
    background-color: #4F46E5; /* Indigo-600 */
    transform: translateY(-2px);
    box-shadow: 0 6px 8px rgba(0, 0, 0, 0.4);
}
.menu-buttons button:active,
.modal-content button.menu-button:active {
    transform: translateY(0);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}
.menu-buttons button.secondary,
.modal-content button.menu-button.secondary {
    background-color: #475569; /* Slate-600 */
}
.menu-buttons button.secondary:hover,
.modal-content button.menu-button.secondary:hover {
    background-color: #334155; /* Slate-700 */
}

/* Game Board */
.game-board,
.game-board-replay {
    display: grid;
    grid-template-columns: repeat(3, 1fr); /* 3 equal columns */
    grid-template-rows: repeat(3, 1fr); /* 3 equal rows */
    gap: 10px; /* Spacing between cells */
    aspect-ratio: 1 / 1; /* Keep board square */
    width: 100%; /* Occupy full width of its parent */
    max-width: 350px; /* Max size for the board itself */
    margin: 0 auto; /* Center the board */
    background-color: #0A1128; /* Base dark blue for board area */
    box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.5);
    border-radius: 10px;
    padding: 10px; /* Inner padding for the grid */
    position: relative; /* For animations */
    overflow: hidden; /* For cell reveal/blind effects */
}

.cell {
    width: 100%; /* Fill grid area */
    height: 100%; /* Fill grid area */
    background-color: #121A2C; /* Darkest blue for cells */
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 3.8em; /* Large font for marks */
    font-weight: bold;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.15s ease-in-out;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.05); /* Very subtle cell border */
    position: relative;
    overflow: hidden; /* For animated marks */
}

.cell:hover:not(.occupied):not(.disabled) {
    background-color: #1A223A; /* Hover effect */
    transform: scale(1.03);
}
.cell.x-mark {
    color: #EF4444; /* Tailwind red-500 */
}
.cell.o-mark {
    color: #3B82F6; /* Tailwind blue-500 */
}
.cell.winning-cell {
    background-color: #10B981; /* Tailwind emerald-500 for win */
    color: #FFFFFF;
    animation: pulse-win 1s infinite alternate;
}
@keyframes pulse-win {
    from { transform: scale(1); opacity: 1; }
    to { transform: scale(1.05); opacity: 0.9; box-shadow: 0 0 15px #10B981; }
}

/* Mark Animation */
.cell span.mark-animated {
    display: block;
    opacity: 0;
    transform: scale(0.5);
    animation: mark-in var(--animation-speed) ease-out forwards;
}
@keyframes mark-in {
    from { opacity: 0; transform: scale(0.5); }
    to { opacity: 1; transform: scale(1); }
}

/* Blind Play Mode */
.cell.blind {
    background-color: rgba(0, 0, 0, 0.7); /* Dark overlay */
    color: transparent; /* Hide X/O */
    cursor: default;
    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.8);
    transition: all 0.5s ease-in-out;
}
.cell.blind.highlight-on-hover:hover {
    background-color: rgba(0, 0, 0, 0.4); /* Slightly reveal on hover */
    cursor: pointer;
}

/* Winning Line Animation */
.winning-line-animation {
    position: absolute;
    background-color: rgba(255, 255, 255, 0.7); /* White line */
    z-index: 10;
    pointer-events: none; /* Don't block clicks */
    border-radius: 5px;
    animation: draw-line var(--animation-speed) ease-out forwards;
}
/* Horizontal */
.winning-line-animation.horizontal {
    height: 10px;
    width: 0%;
    left: 0;
    transform: translateY(-50%);
}
@keyframes draw-line {
    from { width: 0%; }
    to { width: 100%; }
}
/* Vertical */
.winning-line-animation.vertical {
    width: 10px;
    height: 0%;
    top: 0;
    transform: translateX(-50%);
}
@keyframes draw-line-vertical {
    from { height: 0%; }
    to { height: 100%; }
}
/* Diagonal TL-BR */
.winning-line-animation.diag1 {
    width: 10px;
    height: 0%;
    transform-origin: top left;
    transform: rotate(45deg) scaleY(0);
    left: 0; top: 0;
}
@keyframes draw-line-diag1 {
    from { transform: rotate(45deg) scaleY(0); }
    to { transform: rotate(45deg) scaleY(1); height: calc(141.42% * (var(--board-size-px) / 100)); } /* ~sqrt(2) * length */
}
/* Diagonal TR-BL */
.winning-line-animation.diag2 {
    width: 10px;
    height: 0%;
    transform-origin: top right;
    transform: rotate(-45deg) scaleY(0);
    right: 0; top: 0;
}
@keyframes draw-line-diag2 {
    from { transform: rotate(-45deg) scaleY(0); }
    to { transform: rotate(-45deg) scaleY(1); height: calc(141.42% * (var(--board-size-px) / 100)); }
}


/* Status & Buttons (tailwind in html) */
.status-bar {
    background-color: #1E293B;
    padding: 15px 20px;
    border-radius: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1.2em;
    font-weight: bold;
    color: #94A3B8; /* Slate-400 */
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.3);
    flex-wrap: wrap;
}
.player-indicator {
    padding: 5px 10px;
    border-radius: 5px;
    transition: background-color 0.3s;
    margin: 5px 0;
}
.player-indicator.x-active { background-color: rgba(239, 68, 68, 0.2); color: #EF4444; }
.player-indicator.o-active { background-color: rgba(59, 130, 246, 0.2); color: #3B82F6; }


/* Game Timer (Sudden Death) */
.game-timer-container {
    background-color: #1E293B;
    border-radius: 10px;
    padding: 10px 20px;
    text-align: center;
    font-size: 1.8em;
    font-weight: bold;
    color: #E2E8F0;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.3);
    overflow: hidden; /* For progress bar effect */
    position: relative;
}
.game-timer-container.hidden {
    display: none;
}
.game-timer {
    position: relative;
    z-index: 2; /* Above the background bar */
}
.game-timer-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(239, 68, 68, 0.3); /* Reddish overlay for time running out */
    transform-origin: left;
    transform: scaleX(var(--timer-progress, 1)); /* Custom property for JS */
    transition: transform 0.1s linear; /* Smooth fill/empty */
    z-index: 1;
}

/* Modals */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.85); /* Slightly darker overlay */
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease-in-out, visibility 0.3s ease-in-out;
    padding: 20px; /* Padding for mobile view */
}
.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}
.modal-content {
    background-color: #1E293B;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.7);
    max-width: 550px; /* Slightly wider modal content */
    width: 100%;
    color: #E2E8F0; /* Slate-200 */
    transform: translateY(-20px);
    opacity: 0;
    transition: transform 0.3s ease-in-out, opacity 0.3s ease-in-out;
    position: relative; /* For close button */
    max-height: 90vh; /* Ensure modal fits on screen vertically */
    overflow-y: auto; /* Allow scrolling within modal content */
}
.modal-overlay.active .modal-content {
    transform: translateY(0);
    opacity: 1;
}
.modal-content h2 {
    font-size: 2em;
    font-weight: bold;
    margin-bottom: 20px;
    text-align: center;
    color: #6366F1; /* Indigo-500 */
}
.modal-close-button {
    position: absolute;
    top: 15px;
    right: 15px;
    background: none;
    border: none;
    font-size: 1.8em;
    color: #CBD5E1; /* Slate-300 */
    cursor: pointer;
    transition: color 0.2s;
    line-height: 1; /* Better alignment for 'x' */
}
.modal-close-button:hover {
    color: #E2E8F0;
}

/* Settings Modal Specifics */
.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px dashed rgba(255, 255, 255, 0.1);
}
.setting-item:last-child {
    border-bottom: none;
}
.setting-item label {
    font-size: 1.1em;
    color: #94A3B8;
    flex-grow: 1;
}
.setting-item input[type="range"] {
    width: 180px;
    accent-color: #6366F1;
}
.setting-item input[type="checkbox"] {
    width: 24px;
    height: 24px;
    accent-color: #6366F1;
    cursor: pointer;
    margin-left: 10px;
}
.slider-value {
    min-width: 50px;
    text-align: right;
    font-weight: bold;
    color: #E2E8F0;
    margin-left: 10px;
}

/* Radio Button Group */
.setting-group {
    border-bottom: 1px dashed rgba(255, 255, 255, 0.1);
    padding-bottom: 20px;
    margin-bottom: 20px;
}
.setting-group-label {
    font-size: 1.2em;
    font-weight: bold;
    color: #6366F1;
    margin-bottom: 10px;
    display: block;
}
.radio-label {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.1em;
    color: #E2E8F0;
    cursor: pointer;
    transition: color 0.2s;
}
.radio-label:hover {
    color: #CBD5E1;
}
.radio-label input[type="radio"] {
    accent-color: #6366F1;
    width: 18px;
    height: 18px;
}

/* Achievement Modal Specifics */
.achievement-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 15px;
    margin-top: 20px;
}
.achievement-card {
    background-color: #0A1128;
    border-radius: 10px;
    padding: 15px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.4);
    text-align: center;
    transition: transform 0.2s, border-color 0.3s;
    border: 1px solid rgba(255, 255, 255, 0.05);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}
.achievement-card.unlocked {
    border-color: #10B981; /* Emerald border */
    transform: scale(1.02);
}
.achievement-icon {
    font-size: 2.2em;
    margin-bottom: 8px;
    color: #475569; /* Slate for locked */
    transition: color 0.3s;
}
.achievement-card.unlocked .achievement-icon {
    color: #10B981; /* Emerald for unlocked */
}
.achievement-name {
    font-weight: bold;
    color: #E2E8F0;
    margin-bottom: 5px;
    font-size: 0.95em;
}
.achievement-description {
    font-size: 0.75em;
    color: #94A3B8;
}
.achievement-card.unlocked .achievement-description {
    color: #E0FBFC;
}

/* Stats Modal Specifics */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    margin-top: 20px;
}
.stat-card {
    background-color: #0A1128;
    border-radius: 10px;
    padding: 15px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.4);
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.05);
}
.stat-label {
    font-size: 0.9em;
    color: #94A3B8;
    display: block;
    margin-bottom: 5px;
}
.stat-value {
    font-size: 1.8em;
    font-weight: bold;
    color: #E0FBFC;
}

/* Notifications */
.notification {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: #3B82F6; /* Blue for notifications */
    color: white;
    padding: 15px 25px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.4);
    z-index: 2000;
    transform: translateX(120%);
    transition: transform 0.5s ease-out;
    max-width: 300px;
    opacity: 0;
    visibility: hidden;
}
.notification.show {
    transform: translateX(0);
    opacity: 1;
    visibility: visible;
}
.notification h3 {
    font-weight: bold;
    margin-bottom: 5px;
}

/* Animations */
.animate-fade-in {
    animation: fadeIn 1s ease-out forwards;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Themes */
body.theme-dark {
    background-color: #050711;
    color: #E0FBFC;
}
body.theme-dark .app-container,
body.theme-dark .modal-content {
    background-color: #0F172A;
    border-color: #1E293B;
}
body.theme-dark .status-bar,
body.theme-dark .game-timer-container {
    background-color: #1E293B;
    color: #94A3B8;
}
body.theme-dark .game-board,
body.theme-dark .achievement-card,
body.theme-dark .stat-card {
    background-color: #0A1128;
}
body.theme-dark .cell {
    background-color: #121A2C;
    border-color: rgba(255, 255, 255, 0.05);
}
body.theme-dark .cell:hover:not(.occupied):not(.disabled) {
    background-color: #1A223A;
}

/* Light Theme */
body.theme-light {
    background-color: #E0FBFC;
    color: #0F172A;
}
body.theme-light .app-container,
body.theme-light .modal-content {
    background-color: #FFFFFF;
    border-color: #D1D5DB;
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
}
body.theme-light .status-bar,
body.theme-light .game-timer-container {
    background-color: #F3F4F6;
    color: #4B5563;
}
body.theme-light .game-board,
body.theme-light .achievement-card,
body.theme-light .stat-card {
    background-color: #F9FAFB;
}
body.theme-light .cell {
    background-color: #E5E7EB;
    border-color: rgba(0, 0, 0, 0.05);
}
body.theme-light .cell:hover:not(.occupied):not(.disabled) {
    background-color: #D1D5DB;
}
body.theme-light .modal-content h2,
body.theme-light .menu-buttons button,
body.theme-light .modal-content button.menu-button,
body.theme-light .setting-group-label,
body.theme-light .radio-label input[type="radio"] {
    color: #4F46E5; /* Indigo-600 */
    accent-color: #4F46E5;
}
body.theme-light .player-indicator.x-active { background-color: rgba(239, 68, 68, 0.1); }
body.theme-light .player-indicator.o-active { background-color: rgba(59, 130, 246, 0.1); }


/* Matrix Green Theme */
body.theme-matrix {
    background-color: #000000; /* Black */
    color: #00FF41; /* Neo Green */
}
body.theme-matrix .app-container,
body.theme-matrix .modal-content {
    background-color: #000F00; /* Darker green */
    border-color: #008F00;
    box-shadow: 0 15px 30px rgba(0, 255, 65, 0.3);
}
body.theme-matrix h1,
body.theme-matrix .modal-content h2,
body.theme-matrix .menu-buttons button,
body.theme-matrix .modal-content button.menu-button,
body.theme-matrix .setting-group-label,
body.theme-matrix .radio-label input[type="radio"] {
    color: #33FF66; /* Lighter green */
    accent-color: #33FF66;
}
body.theme-matrix .status-bar,
body.theme-matrix .game-timer-container {
    background-color: #002200;
    color: #00B100;
}
body.theme-matrix .game-board,
body.theme-matrix .achievement-card,
body.theme-matrix .stat-card {
    background-color: #001100;
}
body.theme-matrix .cell {
    background-color: #001A00;
    border-color: rgba(0, 255, 65, 0.1);
}
body.theme-matrix .cell:hover:not(.occupied):not(.disabled) {
    background-color: #002A00;
}
body.theme-matrix .cell.x-mark {
    color: #FF0000; /* Red for X */
}
body.theme-matrix .cell.o-mark {
    color: #00AAFF; /* Blue for O */
}
body.theme-matrix .cell.winning-cell {
    background-color: #00FF41;
    color: #000000;
    animation: pulse-win-matrix 1s infinite alternate;
}
@keyframes pulse-win-matrix {
    from { transform: scale(1); opacity: 1; }
    to { transform: scale(1.05); opacity: 0.9; box-shadow: 0 0 15px #00FF41; }
}
body.theme-matrix .achievement-card.unlocked {
    border-color: #00FF41;
}
body.theme-matrix .achievement-card.unlocked .achievement-icon {
    color: #00FF41;
}
body.theme-matrix .game-timer-container::before {
    background-color: rgba(255, 0, 0, 0.3); /* Reddish overlay for time running out */
}
.notification {
    background-color: #00B100;
}