/**
 * 4 in a Row (Connect Four) Game Styles
 *
 * Features:
 * - Responsive 7x6 game board
 * - Classic blue board with red/yellow discs
 * - Light and dark theme support
 * - Smooth drop animations
 * - Accessible focus indicators
 * - RTL support
 */

/* ===== Custom Properties ===== */
:root {
    /* Player colors - classic Connect Four */
    --fiar-player-red: #dc2626;
    --fiar-player-red-light: #fecaca;
    --fiar-player-yellow: #eab308;
    --fiar-player-yellow-light: #fef08a;
    --fiar-win-bg: #10b981;
    --fiar-win-bg-light: #d1fae5;
    --fiar-draw-bg: #64748b;

    /* Board colors - classic blue */
    --fiar-board-bg: #1d4ed8;
    --fiar-board-bg-dark: #1e40af;
    --fiar-board-border: #1e3a8a;
    --fiar-cell-bg: var(--color-bg-card, #ffffff);
    --fiar-cell-empty: var(--color-bg-alt, #f1f5f9);

    /* Sizing */
    --fiar-cell-size: min(60px, calc((100vw - 80px) / 7));
    --fiar-gap: 6px;
    --fiar-radius: var(--radius-md, 8px);
    --fiar-transition: 0.2s ease-out;
    --fiar-drop-duration: 0.4s;
}

[data-theme="dark"] {
    --fiar-player-red: #ef4444;
    --fiar-player-red-light: #450a0a;
    --fiar-player-yellow: #facc15;
    --fiar-player-yellow-light: #422006;
    --fiar-win-bg: #34d399;
    --fiar-win-bg-light: #064e3b;
    --fiar-board-bg: #1e40af;
    --fiar-board-bg-dark: #1e3a8a;
    --fiar-cell-bg: var(--color-bg-alt, #1e293b);
    --fiar-cell-empty: var(--color-bg, #0f172a);
}

/* ===== Container ===== */
.fiar-container {
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
}

.four-in-a-row {
    background: var(--color-bg-card, #ffffff);
    border: 1px solid var(--color-border, #e2e8f0);
    border-radius: var(--radius-lg, 12px);
    padding: var(--space-6, 24px);
    box-shadow: var(--shadow-lg, 0 10px 15px -3px rgba(0, 0, 0, 0.1));
    margin-bottom: var(--space-8, 32px);
}

/* ===== Mode Selector ===== */
.fiar-mode-selector {
    display: flex;
    gap: var(--space-2, 8px);
    justify-content: center;
    margin-bottom: var(--space-4, 16px);
}

.fiar-mode-btn {
    flex: 1;
    max-width: 150px;
    padding: var(--space-2, 8px) var(--space-4, 16px);
    background: var(--color-bg-alt, #f8fafc);
    border: 2px solid var(--color-border, #e2e8f0);
    border-radius: var(--radius-md, 8px);
    color: var(--color-text, #334155);
    font-size: var(--font-size-sm, 14px);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--fiar-transition);
}

.fiar-mode-btn:hover {
    border-color: var(--color-primary, #4f46e5);
    background: var(--color-bg-card, #ffffff);
}

.fiar-mode-btn:focus-visible {
    outline: 2px solid var(--color-primary, #4f46e5);
    outline-offset: 2px;
}

.fiar-mode-btn.active {
    background: var(--color-primary, #4f46e5);
    border-color: var(--color-primary, #4f46e5);
    color: white;
}

/* ===== Difficulty Selector ===== */
.fiar-difficulty-selector {
    display: flex;
    gap: var(--space-2, 8px);
    justify-content: center;
    margin-bottom: var(--space-4, 16px);
}

.fiar-difficulty-btn {
    padding: var(--space-1, 4px) var(--space-3, 12px);
    background: transparent;
    border: 1px solid var(--color-border, #e2e8f0);
    border-radius: var(--radius-sm, 4px);
    color: var(--color-text-muted, #64748b);
    font-size: var(--font-size-xs, 12px);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--fiar-transition);
}

.fiar-difficulty-btn:hover {
    border-color: var(--color-primary, #4f46e5);
    color: var(--color-primary, #4f46e5);
}

.fiar-difficulty-btn:focus-visible {
    outline: 2px solid var(--color-primary, #4f46e5);
    outline-offset: 2px;
}

.fiar-difficulty-btn.active {
    background: var(--color-primary, #4f46e5);
    border-color: var(--color-primary, #4f46e5);
    color: white;
}

/* ===== First Move Selector ===== */
.fiar-first-move-selector {
    display: flex;
    gap: var(--space-2, 8px);
    justify-content: center;
    align-items: center;
    margin-bottom: var(--space-4, 16px);
}

.fiar-selector-label {
    font-size: var(--font-size-xs, 12px);
    font-weight: 500;
    color: var(--color-text-muted, #64748b);
    margin-right: var(--space-1, 4px);
}

.fiar-first-move-btn {
    padding: var(--space-1, 4px) var(--space-3, 12px);
    background: transparent;
    border: 1px solid var(--color-border, #e2e8f0);
    border-radius: var(--radius-sm, 4px);
    color: var(--color-text-muted, #64748b);
    font-size: var(--font-size-xs, 12px);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--fiar-transition);
}

.fiar-first-move-btn:hover {
    border-color: var(--color-primary, #4f46e5);
    color: var(--color-primary, #4f46e5);
}

.fiar-first-move-btn:focus-visible {
    outline: 2px solid var(--color-primary, #4f46e5);
    outline-offset: 2px;
}

.fiar-first-move-btn.active {
    background: var(--color-primary, #4f46e5);
    border-color: var(--color-primary, #4f46e5);
    color: white;
}

/* ===== Game Status ===== */
.fiar-status {
    text-align: center;
    margin-bottom: var(--space-4, 16px);
    padding: var(--space-3, 12px);
    background: var(--color-bg-alt, #f8fafc);
    border-radius: var(--radius-md, 8px);
    transition: background-color var(--fiar-transition), border-color var(--fiar-transition);
    /* Fixed height to prevent layout shifts */
    min-height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    /* Always have border to prevent size changes */
    border: 2px solid transparent;
    box-sizing: border-box;
}

.fiar-status .status-text {
    font-size: var(--font-size-lg, 18px);
    font-weight: 600;
    color: var(--color-text, #334155);
}

.fiar-status.player-red .status-text {
    color: var(--fiar-player-red);
}

.fiar-status.player-yellow .status-text {
    color: var(--fiar-player-yellow);
}

/* Your Turn indicator */
.fiar-status.your-turn {
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.1) 0%, rgba(79, 70, 229, 0.05) 100%);
    border-color: var(--color-primary, #4f46e5);
    animation: yourTurnPulse 2s ease-in-out infinite;
}

.fiar-status.your-turn .status-text {
    color: var(--color-primary, #4f46e5);
    font-weight: 700;
}

.fiar-status.your-turn::before {
    content: "👆 ";
}

@keyframes yourTurnPulse {
    0%, 100% {
        box-shadow: 0 0 0 0 rgba(79, 70, 229, 0.3);
    }
    50% {
        box-shadow: 0 0 0 8px rgba(79, 70, 229, 0);
    }
}

/* Computer thinking state */
.fiar-status.thinking {
    background: rgba(100, 116, 139, 0.1);
    border-color: var(--color-text-muted, #64748b);
}

.fiar-status.thinking .status-text {
    color: var(--color-text-muted, #64748b);
}

.fiar-status.thinking::after {
    content: "";
    display: inline-block;
    width: 1em;
    animation: dots 1.5s steps(4, end) infinite;
}

@keyframes dots {
    0%, 20% { content: ""; }
    40% { content: "."; }
    60% { content: ".."; }
    80%, 100% { content: "..."; }
}

.fiar-status.winner {
    background: var(--fiar-win-bg-light);
    border-color: var(--fiar-win-bg);
    animation: winnerHighlight 0.5s ease-out;
}

.fiar-status.winner .status-text {
    color: var(--fiar-win-bg);
}

.fiar-status.draw {
    background: rgba(100, 116, 139, 0.1);
    border-color: var(--fiar-draw-bg);
}

.fiar-status.draw .status-text {
    color: var(--fiar-draw-bg);
}

/* Use box-shadow animation instead of scale to avoid layout shifts */
@keyframes winnerHighlight {
    0%, 100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
    50% { box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.3); }
}

/* ===== Game Board ===== */
.fiar-board-wrapper {
    display: flex;
    justify-content: center;
    margin-bottom: var(--space-4, 16px);
    /* Prevent layout shifts from winning glow */
    overflow: visible;
}

.fiar-board {
    background: var(--fiar-board-bg);
    border-radius: var(--radius-lg, 12px);
    padding: var(--space-3, 12px);
    box-shadow:
        inset 0 2px 4px rgba(0, 0, 0, 0.1),
        0 4px 6px -1px rgba(0, 0, 0, 0.1);
    position: relative;
    /* Fixed dimensions based on cells to prevent any layout shifts */
    width: calc(var(--fiar-cell-size) * 7 + var(--fiar-gap) * 6 + var(--space-3, 12px) * 2);
}

/* Column indicators for hover feedback */
.fiar-column-indicators {
    display: flex;
    gap: var(--fiar-gap);
    padding: 0 0 var(--space-2, 8px) 0;
    position: relative;
    height: calc(var(--fiar-cell-size) * 0.5);
}

.fiar-column-indicator {
    width: var(--fiar-cell-size);
    height: 100%;
    border-radius: 50%;
    transition: all 0.15s ease;
    opacity: 0;
}

.fiar-column-indicator.preview-red {
    background: var(--fiar-player-red);
    opacity: 0.5;
}

.fiar-column-indicator.preview-yellow {
    background: var(--fiar-player-yellow);
    opacity: 0.5;
}

/* Grid */
.fiar-grid {
    display: flex;
    flex-direction: column;
    gap: var(--fiar-gap);
}

.fiar-row {
    display: flex;
    gap: var(--fiar-gap);
}

.fiar-cell {
    width: var(--fiar-cell-size);
    height: var(--fiar-cell-size);
    background: transparent;
    border: none;
    border-radius: 50%;
    padding: 0;
    cursor: pointer;
    position: relative;
    transition: transform 0.1s ease;
}

.fiar-cell:hover:not(.red):not(.yellow) {
    transform: scale(1.05);
}

.fiar-cell:focus-visible {
    outline: 3px solid white;
    outline-offset: 2px;
    z-index: 2;
}

/* Disc inside cell */
.fiar-disc {
    position: absolute;
    inset: 3px;
    border-radius: 50%;
    background: var(--fiar-cell-empty);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: background-color var(--fiar-transition);
}

/* Placed discs */
.fiar-cell.red .fiar-disc {
    background: var(--fiar-player-red);
    box-shadow:
        inset 0 -3px 6px rgba(0, 0, 0, 0.2),
        inset 0 3px 6px rgba(255, 255, 255, 0.2);
}

.fiar-cell.yellow .fiar-disc {
    background: var(--fiar-player-yellow);
    box-shadow:
        inset 0 -3px 6px rgba(0, 0, 0, 0.2),
        inset 0 3px 6px rgba(255, 255, 255, 0.2);
}

/* Drop animation */
.fiar-cell.dropping .fiar-disc {
    animation: discDrop var(--fiar-drop-duration) cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

@keyframes discDrop {
    0% {
        transform: translateY(calc(-100% - var(--fiar-cell-size) * 6));
        opacity: 0.8;
    }
    60% {
        transform: translateY(0);
    }
    75% {
        transform: translateY(-8px);
    }
    90% {
        transform: translateY(0);
    }
    95% {
        transform: translateY(-3px);
    }
    100% {
        transform: translateY(0);
    }
}

/* Winning cells - use box-shadow glow instead of scale to avoid layout shifts */
.fiar-cell.winning .fiar-disc {
    animation: winPulse 0.6s ease-out infinite alternate;
    box-shadow:
        inset 0 -3px 6px rgba(0, 0, 0, 0.2),
        inset 0 3px 6px rgba(255, 255, 255, 0.2),
        0 0 20px var(--fiar-win-bg);
}

@keyframes winPulse {
    0% {
        box-shadow:
            inset 0 -3px 6px rgba(0, 0, 0, 0.2),
            inset 0 3px 6px rgba(255, 255, 255, 0.2),
            0 0 10px var(--fiar-win-bg);
    }
    100% {
        box-shadow:
            inset 0 -3px 6px rgba(0, 0, 0, 0.2),
            inset 0 3px 6px rgba(255, 255, 255, 0.2),
            0 0 25px var(--fiar-win-bg),
            0 0 35px var(--fiar-win-bg);
    }
}

/* Draw state */
.fiar-cell.draw-state .fiar-disc {
    opacity: 0.6;
}

/* Disabled state (game over or AI thinking) */
.fiar-board.disabled .fiar-cell {
    cursor: not-allowed;
}

.fiar-board.disabled .fiar-cell:hover {
    transform: none;
}

/* Column highlight on hover */
.fiar-board:not(.disabled) .fiar-cell[data-col]:hover ~ .fiar-cell[data-col],
.fiar-board:not(.disabled) .fiar-row:hover .fiar-cell {
    /* Subtle highlight effect handled by JS */
}

/* ===== Control Buttons ===== */
.fiar-controls {
    display: flex;
    gap: var(--space-3, 12px);
    justify-content: center;
    margin-bottom: var(--space-4, 16px);
}

.fiar-btn {
    padding: var(--space-2, 8px) var(--space-4, 16px);
    border-radius: var(--radius-md, 8px);
    font-size: var(--font-size-sm, 14px);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--fiar-transition);
    border: 2px solid transparent;
}

.fiar-btn:focus-visible {
    outline: 2px solid var(--color-primary, #4f46e5);
    outline-offset: 2px;
}

.fiar-btn-primary {
    background: var(--color-primary, #4f46e5);
    color: white;
}

.fiar-btn-primary:hover {
    background: var(--color-primary-dark, #4338ca);
    transform: translateY(-1px);
}

.fiar-btn-secondary {
    background: transparent;
    border-color: var(--color-border, #e2e8f0);
    color: var(--color-text-muted, #64748b);
}

.fiar-btn-secondary:hover {
    border-color: var(--color-primary, #4f46e5);
    color: var(--color-primary, #4f46e5);
}

/* ===== Score Board ===== */
.fiar-scoreboard {
    display: flex;
    justify-content: space-around;
    padding: var(--space-3, 12px);
    background: var(--color-bg-alt, #f8fafc);
    border-radius: var(--radius-md, 8px);
}

.fiar-score {
    text-align: center;
    flex: 1;
}

.fiar-score .score-label {
    display: block;
    font-size: var(--font-size-xs, 12px);
    font-weight: 500;
    color: var(--color-text-muted, #64748b);
    margin-bottom: var(--space-1, 4px);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.fiar-score .score-value {
    display: block;
    font-size: var(--font-size-2xl, 28px);
    font-weight: 700;
    color: var(--color-text, #334155);
    line-height: 1;
    /* Fixed width for numbers to prevent layout shifts */
    min-width: 2ch;
    text-align: center;
}

.fiar-score-red .score-value {
    color: var(--fiar-player-red);
}

.fiar-score-yellow .score-value {
    color: var(--fiar-player-yellow);
}

.fiar-score-draw .score-value {
    color: var(--fiar-draw-bg);
}

/* ===== Help Panel ===== */
.help-panel {
    position: fixed;
    inset: 0;
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4, 16px);
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.help-panel[hidden] {
    display: none;
}

.help-content {
    background: var(--color-bg-card, #ffffff);
    border-radius: var(--radius-lg, 12px);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl, 0 20px 25px -5px rgba(0, 0, 0, 0.1));
}

.help-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4, 16px) var(--space-6, 24px);
    border-bottom: 1px solid var(--color-border, #e2e8f0);
    position: sticky;
    top: 0;
    background: var(--color-bg-card, #ffffff);
}

.help-header h2 {
    font-size: var(--font-size-lg, 18px);
    margin: 0;
}

.help-close {
    width: 36px;
    height: 36px;
    min-width: 36px;
    min-height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl, 20px);
    border-radius: var(--radius-md, 8px);
    color: var(--color-text-muted, #64748b);
    background: transparent;
    border: none;
    cursor: pointer;
}

.help-close:hover {
    background: var(--color-bg-alt, #f8fafc);
    color: var(--color-text, #334155);
}

.help-close:focus-visible {
    outline: 2px solid var(--color-primary, #4f46e5);
    outline-offset: 2px;
}

.help-body {
    padding: var(--space-6, 24px);
}

.help-section {
    margin-bottom: var(--space-6, 24px);
}

.help-section:last-child {
    margin-bottom: 0;
}

.help-section h3 {
    font-size: var(--font-size-base, 16px);
    margin-bottom: var(--space-4, 16px);
    color: var(--color-text, #334155);
}

.help-shortcuts {
    margin: 0;
}

.shortcut-item {
    display: flex;
    gap: var(--space-4, 16px);
    padding: var(--space-2, 8px) 0;
    border-bottom: 1px solid var(--color-border, #e2e8f0);
}

.shortcut-item:last-child {
    border-bottom: none;
}

.shortcut-item dt {
    flex-shrink: 0;
    min-width: 120px;
}

.shortcut-item dd {
    margin: 0;
    color: var(--color-text-muted, #64748b);
}

.help-definitions {
    margin: 0;
}

.definition-item {
    margin-bottom: var(--space-3, 12px);
    padding-left: var(--space-3, 12px);
    border-left: 3px solid var(--color-primary, #4f46e5);
}

.definition-item dt {
    font-weight: 600;
    color: var(--color-text, #334155);
    margin-bottom: var(--space-1, 4px);
}

.definition-item dd {
    margin: 0;
    color: var(--color-text-muted, #64748b);
    font-size: var(--font-size-sm, 14px);
}

.help-steps {
    padding-left: var(--space-6, 24px);
    margin: 0;
}

.help-steps li {
    margin-bottom: var(--space-2, 8px);
    color: var(--color-text, #334155);
}

.help-list {
    list-style: disc;
    padding-left: var(--space-6, 24px);
    margin: 0;
}

.help-list li {
    margin-bottom: var(--space-2, 8px);
    color: var(--color-text, #334155);
}

/* ===== Responsive Styles ===== */
@media (max-width: 480px) {
    :root {
        --fiar-cell-size: calc((100vw - 100px) / 7);
    }

    .four-in-a-row {
        padding: var(--space-4, 16px);
    }

    .fiar-mode-selector {
        flex-direction: column;
        align-items: stretch;
    }

    .fiar-mode-btn {
        max-width: none;
    }

    .fiar-difficulty-selector {
        flex-wrap: wrap;
    }

    .fiar-first-move-selector {
        flex-wrap: wrap;
    }

    .fiar-controls {
        flex-direction: column;
    }

    .fiar-btn {
        width: 100%;
    }

    .fiar-scoreboard {
        flex-direction: row;
        gap: var(--space-2, 8px);
    }

    .fiar-score .score-value {
        font-size: var(--font-size-xl, 24px);
    }

    .fiar-board {
        padding: var(--space-2, 8px);
        /* Update fixed width for mobile padding */
        width: calc(var(--fiar-cell-size) * 7 + var(--fiar-gap) * 6 + var(--space-2, 8px) * 2);
    }

    .fiar-column-indicators {
        height: calc(var(--fiar-cell-size) * 0.4);
    }

    .fiar-status {
        min-height: 48px;
    }
}

/* ===== RTL Support ===== */
[dir="rtl"] .fiar-selector-label {
    margin-right: 0;
    margin-left: var(--space-1, 4px);
}

[dir="rtl"] .definition-item {
    padding-left: 0;
    padding-right: var(--space-3, 12px);
    border-left: none;
    border-right: 3px solid var(--color-primary, #4f46e5);
}

[dir="rtl"] .help-steps,
[dir="rtl"] .help-list {
    padding-left: 0;
    padding-right: var(--space-6, 24px);
}

/* ===== Print Styles ===== */
@media print {
    .four-in-a-row {
        box-shadow: none;
        border: 1px solid #ccc;
    }

    .fiar-mode-selector,
    .fiar-difficulty-selector,
    .fiar-first-move-selector,
    .fiar-controls {
        display: none;
    }
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
    .fiar-cell,
    .fiar-btn,
    .fiar-mode-btn,
    .fiar-difficulty-btn,
    .fiar-status,
    .fiar-disc {
        transition: none;
    }

    .fiar-cell.dropping .fiar-disc,
    .fiar-cell.winning .fiar-disc,
    .fiar-status.winner,
    .fiar-status.your-turn {
        animation: none;
    }
}

/* ===== Keyboard Navigation Highlight ===== */
.fiar-cell.keyboard-focus {
    outline: 3px solid white;
    outline-offset: 2px;
    z-index: 2;
}

.fiar-cell.keyboard-focus .fiar-disc {
    box-shadow:
        inset 0 2px 4px rgba(0, 0, 0, 0.1),
        0 0 0 3px var(--color-primary, #4f46e5);
}