/* ===== CSS Variables & Design Tokens ===== */
:root {
    /* Color Palette - Warm Wood Theme */
    --bg-primary: #d4a574;
    --bg-secondary: #c49a6c;
    --bg-tertiary: #b8916a;
    --bg-card: rgba(139, 90, 43, 0.85);

    --text-primary: #2d1810;
    --text-secondary: #4a3020;
    --text-muted: #6b4a35;

    --accent-primary: #8b4513;
    --accent-secondary: #a0522d;
    --accent-glow: rgba(139, 69, 19, 0.4);

    --success: #228b22;
    --warning: #daa520;
    --danger: #b22222;

    /* Piece Colors */
    --piece-white: linear-gradient(145deg, #fffaf0 0%, #f5f5dc 50%, #e8e0c8 100%);
    --piece-white-shadow: rgba(0, 0, 0, 0.3);
    --piece-white-border: #d4c4a8;
    --piece-black: linear-gradient(145deg, #2d2d2d 0%, #1a1a1a 50%, #0d0d0d 100%);
    --piece-black-shadow: rgba(0, 0, 0, 0.6);
    --piece-black-border: #4a4a4a;

    /* Board Colors */
    --board-bg: linear-gradient(145deg, #8b6914 0%, #6b4423 100%);
    --board-line: #3d2314;
    --board-point: #a67c52;
    --board-point-hover: #c9a66b;
    --board-point-valid: rgba(34, 139, 34, 0.7);
    --board-point-selected: rgba(139, 69, 19, 0.9);
    --board-point-removable: rgba(178, 34, 34, 0.7);

    /* Mill highlight */
    --mill-glow: rgba(255, 215, 0, 0.9);

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 50%;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.25);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 20px var(--accent-glow);
    --shadow-inset: inset 0 2px 8px rgba(0, 0, 0, 0.15);
}

/* ===== Reset & Base Styles ===== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
}

body {
    font-family: 'Outfit', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    /* Wood grain texture effect */
    background-image:
        repeating-linear-gradient(90deg,
            transparent,
            transparent 2px,
            rgba(139, 90, 43, 0.1) 2px,
            rgba(139, 90, 43, 0.1) 4px),
        repeating-linear-gradient(0deg,
            transparent,
            transparent 50px,
            rgba(160, 82, 45, 0.08) 50px,
            rgba(160, 82, 45, 0.08) 100px),
        linear-gradient(180deg, #d4a574 0%, #c49a6c 50%, #b8916a 100%);
}

/* ===== Screen Management ===== */
.screen {
    display: none;
    min-height: 100vh;
    padding: var(--spacing-lg);
}

.screen.active {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== Menu Screen ===== */
.menu-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-2xl);
    max-width: 400px;
    width: 100%;
}

.logo-container {
    text-align: center;
}

.logo-icon {
    width: 120px;
    height: 120px;
    margin: 0 auto var(--spacing-lg);
    color: var(--accent-primary);
    animation: float 3s ease-in-out infinite;
}

@keyframes float {

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

    50% {
        transform: translateY(-10px);
    }
}

.logo-svg {
    width: 100%;
    height: 100%;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.3));
}

.game-title {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--accent-primary);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
    letter-spacing: 0.05em;
}

.game-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-top: var(--spacing-sm);
}

.menu-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    width: 100%;
}

.menu-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg) var(--spacing-xl);
    border: none;
    border-radius: var(--radius-lg);
    font-family: inherit;
    font-size: 1.1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.menu-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.menu-btn:hover::before {
    left: 100%;
}

.menu-btn.primary {
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    color: white;
    box-shadow: var(--shadow-glow), var(--shadow-md);
}

.menu-btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px var(--accent-glow), var(--shadow-lg);
}

.menu-btn.secondary {
    background: linear-gradient(135deg, #f5f5dc 0%, #e8e0c8 100%);
    color: var(--text-primary);
    border: 2px solid var(--accent-primary);
}

.menu-btn.secondary:hover {
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    color: white;
    transform: translateY(-2px);
}

.menu-btn.tertiary {
    background: rgba(255, 255, 255, 0.3);
    color: var(--text-primary);
    border: 1px solid var(--accent-secondary);
}

.menu-btn.tertiary:hover {
    background: rgba(255, 255, 255, 0.5);
}

.btn-icon {
    font-size: 1.4rem;
}

/* ===== Settings Screen ===== */
.settings-container {
    max-width: 500px;
    width: 100%;
    padding: var(--spacing-lg);
}

.back-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 1rem;
    cursor: pointer;
    padding: var(--spacing-sm) 0;
    margin-bottom: var(--spacing-lg);
    transition: color var(--transition-fast);
}

.back-btn:hover {
    color: var(--text-primary);
}

.settings-title {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xl);
    text-align: center;
    color: var(--accent-primary);
}

.settings-group {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(139, 69, 19, 0.3);
    box-shadow: var(--shadow-md), var(--shadow-inset);
}

.settings-group h3 {
    font-size: 0.9rem;
    font-weight: 500;
    color: #f5f5dc;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-md);
}

/* Difficulty Options */
.difficulty-options {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
}

.difficulty-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.15);
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.difficulty-btn:hover {
    background: rgba(255, 255, 255, 0.25);
}

.difficulty-btn.active {
    border-color: #f5f5dc;
    background: rgba(139, 69, 19, 0.5);
}

.diff-icon {
    font-size: 1.8rem;
}

.diff-label {
    font-size: 0.95rem;
    font-weight: 500;
    color: #f5f5dc;
}

.diff-desc {
    font-size: 0.75rem;
    color: rgba(245, 245, 220, 0.7);
}

/* Player Inputs */
.player-inputs {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.player-input {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.player-color {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    flex-shrink: 0;
    border: 2px solid;
}

.player-color.white {
    background: var(--piece-white);
    border-color: var(--piece-white-border);
    box-shadow: 0 2px 8px var(--piece-white-shadow);
}

.player-color.black {
    background: var(--piece-black);
    border-color: var(--piece-black-border);
    box-shadow: 0 2px 8px var(--piece-black-shadow);
}

.player-input input {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.9);
    border: 2px solid var(--accent-secondary);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    color: var(--text-primary);
    transition: border-color var(--transition-fast);
}

.player-input input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.player-input input::placeholder {
    color: var(--text-muted);
}

/* Timer Toggle */
.timer-toggle {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.toggle-switch {
    position: relative;
    width: 52px;
    height: 28px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    inset: 0;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 28px;
    transition: var(--transition-normal);
}

.slider::before {
    content: '';
    position: absolute;
    height: 22px;
    width: 22px;
    left: 3px;
    bottom: 3px;
    background: #f5f5dc;
    border-radius: var(--radius-full);
    transition: var(--transition-normal);
}

.toggle-switch input:checked+.slider {
    background: var(--accent-primary);
}

.toggle-switch input:checked+.slider::before {
    transform: translateX(24px);
}

.toggle-label {
    color: #f5f5dc;
    font-size: 0.95rem;
}

.timer-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    opacity: 0.5;
    pointer-events: none;
    transition: opacity var(--transition-normal);
}

.timer-options.active {
    opacity: 1;
    pointer-events: auto;
}

.timer-hint {
    color: rgba(245, 245, 220, 0.8);
    font-size: 0.85rem;
    margin-bottom: var(--spacing-xs);
}

.timer-buttons {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
}

.timer-btn,
.rounds-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.15);
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 0.95rem;
    color: #f5f5dc;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.timer-btn:hover,
.rounds-btn:hover {
    background: rgba(255, 255, 255, 0.25);
}

.timer-btn.active,
.rounds-btn.active {
    border-color: #f5f5dc;
    background: rgba(139, 69, 19, 0.5);
}

.increment-toggle {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding-top: var(--spacing-sm);
    border-top: 1px solid rgba(255, 255, 255, 0.15);
}

.toggle-switch.small {
    width: 40px;
    height: 22px;
}

.toggle-switch.small .slider::before {
    height: 16px;
    width: 16px;
}

.toggle-switch.small input:checked+.slider::before {
    transform: translateX(18px);
}

.rounds-options {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-sm);
}

/* Start Game Button */
.start-game-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    width: 100%;
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    border: none;
    border-radius: var(--radius-lg);
    font-family: inherit;
    font-size: 1.2rem;
    font-weight: 600;
    color: white;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-glow), var(--shadow-md);
}

.start-game-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px var(--accent-glow), var(--shadow-lg);
}

.btn-arrow {
    transition: transform var(--transition-fast);
}

.start-game-btn:hover .btn-arrow {
    transform: translateX(4px);
}

/* ===== Game Screen ===== */
#game-screen {
    padding: var(--spacing-md);
    justify-content: flex-start;
}

.game-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    max-width: 800px;
    margin-bottom: var(--spacing-md);
}

.icon-btn {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border: 2px solid rgba(139, 69, 19, 0.3);
    border-radius: var(--radius-md);
    font-size: 1.2rem;
    color: #f5f5dc;
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.icon-btn:hover {
    background: var(--accent-primary);
    color: white;
}

.round-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1rem;
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.3);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
}

.round-info span:first-child {
    color: var(--text-primary);
    font-weight: 500;
}

/* Game Content Layout */
.game-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    width: 100%;
    max-width: 1000px;
    flex: 1;
}

/* Player Panels */
.player-panel {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 3px solid transparent;
    backdrop-filter: blur(10px);
    min-width: 160px;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
}

.player-panel.active {
    border-color: #ffd700;
    box-shadow: 0 0 20px rgba(255, 215, 0, 0.4), var(--shadow-md);
}

.player-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.player-avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    flex-shrink: 0;
    border: 2px solid;
}

.player-avatar.white-piece {
    background: var(--piece-white);
    border-color: var(--piece-white-border);
    box-shadow: 0 2px 8px var(--piece-white-shadow);
}

.player-avatar.black-piece {
    background: var(--piece-black);
    border-color: var(--piece-black-border);
    box-shadow: 0 2px 8px var(--piece-black-shadow);
}

.player-details {
    display: flex;
    flex-direction: column;
}

.player-name {
    font-weight: 500;
    font-size: 1rem;
    color: #f5f5dc;
}

.player-score {
    font-size: 1.5rem;
    font-weight: 700;
    color: #ffd700;
}

.piece-count {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.9rem;
    color: rgba(245, 245, 220, 0.8);
}

.pieces-value {
    font-weight: 600;
    color: #f5f5dc;
}

.timer-display {
    display: none;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.timer-display.active {
    display: flex;
}

.timer-bar {
    height: 6px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 3px;
    overflow: hidden;
}

.timer-fill {
    height: 100%;
    background: #ffd700;
    border-radius: 3px;
    transition: width 0.1s linear, background-color var(--transition-fast);
    width: 100%;
}

.timer-fill.warning {
    background: var(--warning);
}

.timer-fill.danger {
    background: var(--danger);
    animation: pulse 0.5s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.6;
    }
}

.timer-text {
    font-size: 0.85rem;
    font-weight: 500;
    text-align: center;
    color: rgba(245, 245, 220, 0.8);
}

/* Game Board */
.board-container {
    position: relative;
    width: 100%;
    max-width: 500px;
    aspect-ratio: 1;
}

.board-lines {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.board-svg {
    width: 100%;
    height: 100%;
}

.board {
    position: absolute;
    inset: 0;
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    grid-template-rows: repeat(7, 1fr);
    /* Wood board background */
    background:
        linear-gradient(135deg, #a67c52 0%, #8b6914 50%, #6b4423 100%);
    border-radius: var(--radius-lg);
    box-shadow:
        var(--shadow-lg),
        inset 0 0 30px rgba(0, 0, 0, 0.2),
        inset 0 0 60px rgba(0, 0, 0, 0.1);
    border: 4px solid #5d3a1a;
}

/* Board Positions */
.board-position {
    position: absolute;
    width: 44px;
    height: 44px;
    transform: translate(-50%, -50%);
    border-radius: var(--radius-full);
    background: #c9a66b;
    border: 3px solid #5d3a1a;
    cursor: pointer;
    transition: all var(--transition-fast);
    z-index: 1;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.2);
}

.board-position:hover {
    background: #ddb892;
    transform: translate(-50%, -50%) scale(1.1);
}

.board-position.valid {
    background: var(--board-point-valid);
    border-color: var(--success);
    animation: validPulse 1s ease-in-out infinite;
}

@keyframes validPulse {

    0%,
    100% {
        box-shadow: 0 0 0 0 rgba(34, 139, 34, 0.5);
    }

    50% {
        box-shadow: 0 0 0 8px rgba(34, 139, 34, 0);
    }
}

.board-position.removable {
    background: var(--board-point-removable);
    border-color: var(--danger);
    animation: removablePulse 0.8s ease-in-out infinite;
}

@keyframes removablePulse {

    0%,
    100% {
        box-shadow: 0 0 0 0 rgba(178, 34, 34, 0.5);
    }

    50% {
        box-shadow: 0 0 0 8px rgba(178, 34, 34, 0);
    }
}

.board-position.selected {
    background: var(--board-point-selected);
    border-color: #ffd700;
    box-shadow: 0 0 15px rgba(255, 215, 0, 0.6);
}

/* Pieces on Board */
.board-position .piece {
    position: absolute;
    inset: 2px;
    border-radius: var(--radius-full);
    transition: all var(--transition-normal);
    border: 2px solid;
}

.board-position .piece.white {
    background: var(--piece-white);
    border-color: var(--piece-white-border);
    box-shadow:
        0 4px 12px var(--piece-white-shadow),
        inset 0 -3px 6px rgba(0, 0, 0, 0.1),
        inset 0 3px 6px rgba(255, 255, 255, 0.8);
}

.board-position .piece.black {
    background: var(--piece-black);
    border-color: var(--piece-black-border);
    box-shadow:
        0 4px 12px var(--piece-black-shadow),
        inset 0 3px 6px rgba(255, 255, 255, 0.15),
        inset 0 -2px 4px rgba(0, 0, 0, 0.3);
}

.board-position .piece.mill {
    animation: millGlow 0.6s ease-in-out;
}

@keyframes millGlow {

    0%,
    100% {
        box-shadow: 0 0 0 0 var(--mill-glow);
    }

    50% {
        box-shadow: 0 0 25px 12px var(--mill-glow);
    }
}

/* Piece placement animation */
.board-position .piece.placing {
    animation: placePiece 0.4s ease-out;
}

@keyframes placePiece {
    0% {
        transform: scale(0) rotate(180deg);
        opacity: 0;
    }

    60% {
        transform: scale(1.2) rotate(-10deg);
    }

    100% {
        transform: scale(1) rotate(0);
        opacity: 1;
    }
}

/* Piece removal animation */
.board-position .piece.removing {
    animation: removePiece 0.4s ease-in forwards;
}

@keyframes removePiece {
    0% {
        transform: scale(1);
        opacity: 1;
    }

    50% {
        transform: scale(1.2);
    }

    100% {
        transform: scale(0);
        opacity: 0;
    }
}

/* Piece movement animation */
.board-position .piece.moving {
    animation: movePiece 0.3s ease-out;
}

@keyframes movePiece {
    0% {
        transform: scale(1.1);
    }

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

/* Game Status */
.game-status {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    margin-top: var(--spacing-md);
    max-width: 500px;
    width: 100%;
    box-shadow: var(--shadow-md);
    border: 2px solid rgba(139, 69, 19, 0.3);
}

.status-indicator {
    width: 20px;
    height: 20px;
    border-radius: var(--radius-full);
    transition: background var(--transition-fast);
    border: 2px solid;
}

.status-indicator.white {
    background: var(--piece-white);
    border-color: var(--piece-white-border);
}

.status-indicator.black {
    background: var(--piece-black);
    border-color: var(--piece-black-border);
}

.status-text {
    font-size: 1rem;
    color: #f5f5dc;
    font-weight: 500;
}

/* ===== Modals ===== */
.modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    z-index: 100;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.modal.active {
    display: flex;
    animation: fadeIn 0.3s ease;
}

.modal-content {
    background: linear-gradient(145deg, #a67c52 0%, #8b6914 100%);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    max-width: 450px;
    width: 100%;
    position: relative;
    border: 3px solid #5d3a1a;
    box-shadow: var(--shadow-lg);
}

.close-modal {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    font-size: 1.5rem;
    color: rgba(245, 245, 220, 0.7);
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.close-modal:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #f5f5dc;
}

.modal-content h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    text-align: center;
    color: #f5f5dc;
}

.modal-btn {
    display: block;
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    margin-top: var(--spacing-sm);
}

.modal-btn.primary {
    background: linear-gradient(135deg, #228b22 0%, #2e8b57 100%);
    color: white;
}

.modal-btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(34, 139, 34, 0.4);
}

.modal-btn.secondary {
    background: rgba(255, 255, 255, 0.2);
    color: #f5f5dc;
}

.modal-btn.secondary:hover {
    background: rgba(255, 255, 255, 0.3);
}

.modal-btn.tertiary {
    background: transparent;
    color: rgba(245, 245, 220, 0.8);
}

.modal-btn.tertiary:hover {
    color: #f5f5dc;
}

/* Rules Modal */
.rules-content {
    max-height: 80vh;
    overflow-y: auto;
}

.rules-section {
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.rules-section:last-of-type {
    border-bottom: none;
}

.rules-section h3 {
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
    color: #ffd700;
}

.rules-section p {
    color: rgba(245, 245, 220, 0.9);
    line-height: 1.6;
}

/* Game Over Modal */
.winner-display {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.winner-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    border: 3px solid;
}

.winner-icon.white {
    background: var(--piece-white);
    border-color: var(--piece-white-border);
}

.winner-icon.black {
    background: var(--piece-black);
    border-color: var(--piece-black-border);
}

#winner-text {
    font-size: 1.4rem;
    margin-bottom: var(--spacing-sm);
    color: #f5f5dc;
}

#win-reason {
    color: rgba(245, 245, 220, 0.8);
    font-size: 0.95rem;
}

.score-display {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.score-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

.score-player {
    font-size: 0.9rem;
    color: rgba(245, 245, 220, 0.8);
}

.score-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: #ffd700;
}

.score-separator {
    font-size: 2rem;
    color: rgba(245, 245, 220, 0.6);
}

.gameover-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

/* Series Over Modal */
.seriesover-content {
    text-align: center;
    overflow: hidden;
}

.trophy-display {
    margin-bottom: var(--spacing-lg);
}

.trophy-icon {
    font-size: 4rem;
    display: block;
    animation: bounce 1s ease-in-out infinite;
}

@keyframes bounce {

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

    50% {
        transform: translateY(-10px);
    }
}

.final-score {
    margin-bottom: var(--spacing-xl);
}

#final-score-text {
    font-size: 3rem;
    font-weight: 700;
    color: #ffd700;
}

/* In-game Menu */
.ingame-content h2 {
    margin-bottom: var(--spacing-xl);
}

.ingame-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

/* ===== Responsive Design ===== */
@media (max-width: 900px) {
    .game-content {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .player-panel {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
        min-width: auto;
        width: 100%;
        max-width: 500px;
    }

    .timer-display {
        flex: 1;
        max-width: 150px;
    }
}

@media (max-width: 600px) {
    html {
        font-size: 14px;
    }

    .board-container {
        max-width: 350px;
    }

    .board-position {
        width: 36px;
        height: 36px;
    }

    .game-title {
        font-size: 2.5rem;
    }

    .logo-icon {
        width: 80px;
        height: 80px;
    }

    .difficulty-options {
        grid-template-columns: 1fr;
    }

    .diff-desc {
        display: none;
    }
}

/* ===== Utility Classes ===== */
.hidden {
    display: none !important;
}

.disabled {
    pointer-events: none;
    opacity: 0.5;
}