/* Base Reset & Fonts */
:root {
    /* DAY MODE (Default - Pastel) */
    --bg-color: #fdf6e3;
    --text-color: #586e75;
    --accent-color: #b58900;

    --container-bg: #fff;
    --container-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);

    --board-gap: 2px;
    --game-board-bg: #fff;
    --cell-size: 50px;
    --border-radius: 12px;

    --cell-base-bg: #f0f0f0;
    --cell-hover-filter: brightness(0.95);

    --btn-bg: #fff;
    --btn-border: rgba(0, 0, 0, 0.1);
    --btn-hover-bg: #f0f0f0;
    --btn-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
    --btn-text-color: #586e75;

    --modal-overlay: rgba(255, 255, 255, 0.8);
    --modal-bg: #fff;
    --timer-bg: rgba(0, 0, 0, 0.05);

    --icon-queen-fill: #2c3e50;
    --icon-cross-fill: rgba(0, 0, 0, 0.3);

    /* Region Colors - Pastel */
    --color-0: #ffb7b2;
    --color-1: #a2d2ff;
    --color-2: #b5e48c;
    --color-3: #ffdac1;
    --color-4: #cdb4db;
    --color-5: #ff99c8;
    --color-6: #a0c4ff;
    --color-7: #e2f0cb;
    --color-8: #ffc8dd;
    --color-9: #9bf6ff;
}

body.dark-mode {
    /* NIGHT MODE (Vibrant Dark) */
    --bg-color: #121212;
    --text-color: #ffffff;
    --accent-color: #fca311;

    --container-bg: #e0e0e0;
    /* A bit of contrast for the frame */
    --container-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);

    --game-board-bg: #2d2d2d;
    --cell-base-bg: #333;
    --cell-hover-filter: brightness(1.2);

    --btn-bg: #1e1e1e;
    --btn-border: rgba(255, 255, 255, 0.2);
    --btn-hover-bg: #333;
    --btn-shadow: 0 2px 5px rgba(0, 0, 0, 0.5);
    --btn-text-color: #ffffff;

    --modal-overlay: rgba(0, 0, 0, 0.8);
    --modal-bg: #1e1e1e;
    --timer-bg: rgba(255, 255, 255, 0.1);

    --icon-queen-fill: #fff;
    --icon-cross-fill: rgba(255, 255, 255, 0.6);

    /* Region Colors - Saturated Pastel (Soft/Vibrant) */
    --color-0: #ff6b6b;
    /* Soft Red */
    --color-1: #4fabff;
    /* Soft Blue */
    --color-2: #95e06c;
    /* Soft Green */
    --color-3: #ffbe76;
    /* Soft Orange */
    --color-4: #a29bfe;
    /* Soft Purple */
    --color-5: #ff79c6;
    /* Soft Hot Pink */
    --color-6: #74b9ff;
    /* Soft Azure */
    --color-7: #badc58;
    /* Soft Lime */
    --color-8: #ff9ff3;
    /* Soft Pink */
    --color-9: #67e6dc;
    /* Soft Cyan */
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    /* align-items: center; Remove centering enabling long content scrolling */
    min-height: 100vh;
    /* overflow: hidden; Removed to allow scrolling */
}

.app-container {
    width: 100%;
    max-width: 600px;
    padding: 20px 20px 40px 20px;
    /* Add bottom padding for scroll space */
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    margin: 0 auto;
    /* Center horizontally */
}

header {
    text-align: center;
    width: 100%;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

h1 {
    font-weight: 700;
    font-size: 2rem;
    letter-spacing: -0.02em;
}

.timer {
    font-family: monospace;
    font-size: 1.2rem;
    background: rgba(255, 255, 255, 0.1);
    padding: 4px 12px;
    border-radius: 12px;
}

.subtitle {
    font-size: 0.9rem;
    opacity: 0.7;
    margin-bottom: 20px;
}

/* Game Board Container */
.game-board-container {
    /* Removed background/shadow from here to allow labels to be outside */
    display: flex;
    justify-content: center;
    padding: 10px;
}

.game-board {
    display: grid;
    /* Grid Layout: [Corner] [Top Headers]
                    [Left Headers] [Inner Board] */
    grid-template-columns: 30px 1fr;
    grid-template-rows: 30px 1fr;
    gap: 4px;
    /* Gap between labels and board */
}

/* 1. Corner */
/* 1. Corner */
/* .label-corner ruleset moved to bottom with other labels */

/* 2. Top Labels Container */
.labels-top {
    display: grid;
    /* Columns defined in JS */
    gap: var(--board-gap);
    /* Must match inner-board gap */
    padding: 0 8px;
    /* Match inner-board horizontal padding */
    align-items: end;
    /* Bottom align text */
}

/* 3. Left Labels Container */
.labels-left {
    display: grid;
    /* Rows defined in JS */
    gap: var(--board-gap);
    /* Must match inner-board gap */
    padding: 8px 0;
    /* Match inner-board vertical padding */
    justify-items: end;
    /* Right align text */
}

/* 4. Inner Board (The playing field) */
.inner-board {
    display: grid;
    background: var(--game-board-bg);
    padding: 8px;
    /* Internal padding around cells */
    border-radius: var(--border-radius);
    box-shadow: var(--container-shadow);
    gap: var(--board-gap);
    /* Columns/Rows defined in JS */
}



/* Controls */
.controls {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    width: 100%;
    margin-top: 20px;
}

.control-row {
    display: flex;
    gap: 15px;
    align-items: center;
    flex-wrap: wrap;
    justify-content: center;
}

.actions-row {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

select {
    background: var(--btn-bg);
    color: var(--btn-text-color);
    border: 1px solid var(--btn-border);
    padding: 10px 15px;
    border-radius: 8px;
    cursor: pointer;
    font-family: inherit;
    font-weight: 600;
    box-shadow: var(--btn-shadow);
    outline: none;
}

/* Ensure select matches button height roughly */

button {
    background: var(--btn-bg);
    color: var(--btn-text-color);
    border: 1px solid var(--btn-border);
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-family: inherit;
    font-weight: 600;
    transition: all 0.2s ease;
    box-shadow: var(--btn-shadow);
}

button:hover {
    background: var(--btn-hover-bg);
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

button:active {
    transform: translateY(0);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}



/* Toggle Switch */
.toggle-container {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
    cursor: pointer;
    user-select: none;
}

.toggle-container input:disabled+label {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--modal-overlay);
    backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.modal-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.modal-content {
    background: var(--modal-bg);
    padding: 40px;
    border-radius: 16px;
    text-align: center;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.1);
    max-width: 90%;
    width: 400px;
    border: 1px solid var(--btn-border);
}

.modal-icon {
    font-size: 3rem;
    margin-bottom: 20px;
    display: block;
}

.modal-content h2 {
    margin-bottom: 10px;
    color: var(--text-color);
}

.modal-content p {
    color: var(--text-color);
    opacity: 0.8;
    margin-bottom: 30px;
}

/* Status */
#status-message {
    height: 20px;
    text-align: center;
    font-weight: 600;
    color: var(--text-color);
}

/* Animations */
@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    25% {
        transform: translateX(-5px);
    }

    75% {
        transform: translateX(5px);
    }
}

@keyframes flashAnimation {
    0% {
        background-color: #fff;
    }

    /* Flash white */
    100% {}
}

/* Layout for Dropdown */
select {
    padding: 8px 12px;
    border-radius: 8px;
    border: 1px solid var(--btn-border);
    background: var(--btn-bg);
    font-family: inherit;
    color: var(--text-color);
    cursor: pointer;
}

.timer {
    background: var(--timer-bg);
    color: var(--text-color);
}

header h1 {
    color: var(--text-color);
}

.cell {
    width: var(--cell-size);
    height: var(--cell-size);
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    font-size: 1.5rem;
    transition: background-color 0.2s ease, filter 0.2s ease, transform 0.2s ease;
    user-select: none;
    touch-action: none;
    /* Prevent scroll on mobile/tablet during drag */
    -webkit-user-drag: none;
    /* Webkit specific */
    background-color: var(--cell-base-bg);
    position: relative;
    border-radius: 4px;
    /* Soften cells too */
}

.cell:hover {
    filter: var(--cell-hover-filter);
}

/* Icons */
.icon-queen,
.icon-cross {
    width: 60%;
    height: 60%;
    display: block;
    pointer-events: none;
    /* animation: popIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275); Remove animation to stop re-triggering */
}

.icon-queen {
    fill: var(--icon-queen-fill);
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.icon-cross {
    fill: var(--icon-cross-fill);
}

.cell.error {
    animation: shake 0.4s ease-in-out;
}

.cell.error .icon-queen {
    fill: #ff3333;
}

/* Region Colors */
.cell.region-0 {
    background-color: var(--color-0);
}

.cell.region-1 {
    background-color: var(--color-1);
}

.cell.region-2 {
    background-color: var(--color-2);
}

.cell.region-3 {
    background-color: var(--color-3);
}

.cell.region-4 {
    background-color: var(--color-4);
}

.cell.region-5 {
    background-color: var(--color-5);
}

.cell.region-6 {
    background-color: var(--color-6);
}

.cell.region-7 {
    background-color: var(--color-7);
}

.cell.region-8 {
    background-color: var(--color-8);
}

.cell.region-9 {
    background-color: var(--color-9);
}

.cell.flash {
    animation: flashAnimation 0.5s ease-in-out;
    background-color: #ffd700 !important;
}

/* Region Border Highlighting (Perimeter only) */
.cell.highlight-region {
    /* Remove previous filter/inset shadow */
    filter: none;
    box-shadow: none;
    z-index: 2;
    /* Bring above neighbors */
}

/* Use inset box-shadows to draw inner borders on specific sides */
/* Note: We accumulate shadows if multiple sides match. */
/* CSS doesn't support additive classes for one property easily without separate rules. */
/* We will use separate properties or a different approach? */
/* Actually, simple border properties are easiest if box-sizing is border-box. */
/* But border adds size or shrinks content. */
/* Let's use box-shadow with specific offsets. */
/* Or, since we have specific classes: */

.cell.highlight-region.region-top {
    border-top: 2px solid rgba(255, 255, 255, 0.8);
}

.cell.highlight-region.region-bottom {
    border-bottom: 2px solid rgba(255, 255, 255, 0.8);
}

.cell.highlight-region.region-left {
    border-left: 2px solid rgba(255, 255, 255, 0.8);
}

.cell.highlight-region.region-right {
    border-right: 2px solid rgba(255, 255, 255, 0.8);
}

body.dark-mode .cell.highlight-region.region-top {
    border-top-color: rgba(255, 255, 255, 0.9);
}

body.dark-mode .cell.highlight-region.region-bottom {
    border-bottom-color: rgba(255, 255, 255, 0.9);
}

body.dark-mode .cell.highlight-region.region-left {
    border-left-color: rgba(255, 255, 255, 0.9);
}

body.dark-mode .cell.highlight-region.region-right {
    border-right-color: rgba(255, 255, 255, 0.9);
}

@keyframes flashAnimation {
    0% {
        filter: brightness(1);
    }

    50% {
        filter: brightness(2);
    }

    100% {
        filter: brightness(1);
    }
}


/* Controls */
.controls {
    display: flex;
    gap: 20px;
    align-items: center;
    margin-top: 10px;
}

.btn {
    border: none;
    padding: 10px 24px;
    border-radius: 20px;
    font-family: inherit;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.1s;
}

.btn:active {
    transform: scale(0.95);
}

.btn.primary {
    background-color: var(--accent-color);
    color: #fff;
    /* Primary always white text on accent */
}

.btn.primary:hover {
    filter: brightness(0.9);
}

.btn.secondary {
    background-color: var(--btn-bg);
    color: var(--btn-text-color);
    border: 1px solid var(--btn-border);
}

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

.toggle-container {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
}

.status-message {
    height: 20px;
    font-size: 0.9rem;
    color: #ff5555;
    font-weight: 500;
}

/* Board Labels */
.label-corner {
    width: 30px;
    height: 30px;
    /* Aligns with column headers if needed, but grid handles it */
}

.label-col {
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: bold;
    color: var(--text-color);
    padding-bottom: 4px;
}

.label-row {
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: bold;
    color: var(--text-color);
    padding-right: 4px;
    /* Height matches cell size via grid, but we can center it */
}

/* Modals */
#win-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    /* Hidden state */
    transition: opacity 0.3s;
}

.modal:not(.hidden) {
    opacity: 1;
    pointer-events: auto;
}

.modal-content {
    background: #1e1e1e;
    padding: 40px;
    border-radius: 16px;
    text-align: center;
    min-width: 300px;
    transform: translateY(20px);
    transition: transform 0.3s;
}

.modal:not(.hidden) .modal-content {
    transform: translateY(0);
}

.modal h2 {
    margin-bottom: 10px;
    color: var(--accent-color);
}

.modal p {
    margin-bottom: 24px;
}

/* Animations */
@keyframes popIn {
    0% {
        transform: scale(0);
        opacity: 0;
    }

    100% {
        transform: scale(1);
        opacity: 1;
    }
}

@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    25% {
        transform: translateX(-4px);
    }

    75% {
        transform: translateX(4px);
    }
}

/* Responsive */
@media (max-width: 500px) {
    :root {
        --cell-size: 40px;
    }
}

.hidden {
    display: none !important;
}