/* --- Basic Setup & Typography --- */
@import url('https://fonts.googleapis.com/css2?family=VT323&display=swap');

:root {
    --green-felt: #008000;
    --card-border: #000000;
    --card-bg: #ffffff;
    --red-suit: #ff0000;
    --black-suit: #000000;
    --card-width: 100px;
    --card-height: 140px;
    --card-border-radius: 8px;
    --overlap-offset: 25px;
    --top-spacing: 20px;
    --side-spacing: 20px;
    
    /* Default Card Back Theme (Classic Blue) */
    --card-back-primary: #0000a0;
    --card-back-secondary: #5555ff;
    --card-back-pattern: linear-gradient(45deg, var(--card-back-secondary) 25%, transparent 25%), 
                            linear-gradient(-45deg, var(--card-back-secondary) 25%, transparent 25%),
                            linear-gradient(45deg, transparent 75%, var(--card-back-secondary) 75%),
                            linear-gradient(-45deg, transparent 75%, var(--card-back-secondary) 75%);
}

body {
    background-color: var(--green-felt);
    font-family: 'Arial', sans-serif;
    user-select: none;
    overflow-x: hidden; /* Prevent horizontal scroll when menu is open */
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
}

html, body {
    overscroll-behavior: none;
}

/* --- Game Container --- */
#game-board {
    position: relative;
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    padding: var(--top-spacing) var(--side-spacing);
    box-sizing: border-box;
    transition: transform 0.3s ease-in-out; /* For menu push effect */
}

/* --- Game Areas --- */
.game-area {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    justify-content: space-between;
    gap: 15px;
}

.top-area {
    height: calc(var(--card-height) + 10px);
    margin-bottom: 20px;
}

.tableau-area {
    min-height: calc(var(--card-height) * 2);
}

/* --- Piles (Foundations, Tableau, Stock, Waste) --- */
.pile {
    position: relative;
    width: var(--card-width);
    height: var(--card-height);
    border: 2px solid rgba(0, 0, 0, 0.2);
    border-radius: var(--card-border-radius);
    background-color: rgba(0, 0, 0, 0.1);
}

.pile.foundation {
    display: flex;
    justify-content: center;
    align-items: center;
}

.pile.foundation::before {
    font-size: 80px;
    color: rgba(255, 255, 255, 0.15);
    font-family: 'Times New Roman', serif;
}

#foundation-0::before { content: '♠'; }
#foundation-1::before { content: '♥'; }
#foundation-2::before { content: '♣'; }
#foundation-3::before { content: '♦'; }

/* --- Stock Pile Visuals --- */
.pile.stock {
    background-color: transparent;
    border: 2px solid rgba(0,0,0,0.2);
    cursor: pointer;
}

#stock-visual-container {
    width: 100%;
    height: 100%;
    position: relative;
}

#stock-visual-container .card-stack {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: var(--card-border-radius);
    background-color: var(--card-bg);
    box-shadow: 0 1px 3px rgba(0,0,0,0.3);
    transition: top 0.2s, left 0.2s;
}

/* --- Card Styling --- */
.card {
    width: var(--card-width);
    height: var(--card-height);
    border-radius: var(--card-border-radius);
    position: absolute;
    top: 0;
    left: 0;
    cursor: grab;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
    overflow: hidden;
    transition: top 0.15s ease-out, left 0.15s ease-out;
}

.card.dragging {
    cursor: grabbing;
    z-index: 1000;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.4);
    transform: scale(1.05);
    transition: none; /* Disable transition while dragging for responsiveness */
}

/* Card Face */
.card .face {
    width: 100%;
    height: 100%;
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--card-border-radius);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    box-sizing: border-box;
    padding: 5px;
    position: relative;
}

.card .rank, .card .suit {
    font-size: 20px;
    line-height: 1;
}

.card .top-left, .card .bottom-right {
    position: absolute;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.card .top-left { top: 5px; left: 8px; }
.card .bottom-right { bottom: 5px; right: 8px; transform: rotate(180deg); }

.card.red { color: var(--red-suit); }
.card.black { color: var(--black-suit); }

.card .center-suit {
    font-size: 50px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

/* Card Back (XP Style) */
.card .back, #stock-visual-container .card-stack, .deck-preview {
    width: 100%;
    height: 100%;
    background-color: var(--card-back-primary);
    border-radius: var(--card-border-radius);
    position: relative;
    background-image: var(--card-back-pattern);
    background-size: 10px 10px;
    background-position: 0 0, 0 5px, 5px -5px, -5px 0px;
    border: 5px solid white;
    box-sizing: border-box;
}

.card .back::before, #stock-visual-container .card-stack::before, .deck-preview::before {
    content: '';
    position: absolute;
    inset: 5px;
    border: 1px solid black;
    border-radius: 2px;
}

.card.face-down .face { display: none; }
.card.face-up .back { display: none; }

/* --- Tableau Pile Card Stacking --- */
.tableau .card {
    position: absolute;
}

/* --- Win Animation --- */
.win-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    flex-direction: column;
}
.win-message {
    color: white;
    font-family: 'VT323', monospace;
    font-size: 8rem;
    text-shadow: 0 0 10px #0f0, 0 0 20px #0f0;
    animation: pulse 1.5s infinite;
}

.menu-btn {
    margin-bottom: 15px;
    padding: 15px 30px;
    font-size: 1.5rem;
    font-family: 'VT323', monospace;
    cursor: pointer;
    background-color: #f0f0f0;
    border: 2px solid #333;
    border-radius: 8px;
    box-shadow: 0 4px 0 #999;
    transition: all 0.1s ease-in-out;
    width: 100%;
    text-align: left;
}

.menu-btn:active {
    transform: translateY(2px);
    box-shadow: 0 2px 0 #999;
}

/* --- UI Controls & Hamburger Menu --- */
#ui-controls {
    position: fixed;
    bottom: 20px;
    left: 20px;
    z-index: 7000;
    display: flex;
    gap: 15px;
    align-items: center;
    transition: transform 0.3s ease-in-out;
}

#menu-toggle, #undo-main-btn {
    width: 50px;
    height: 50px;
    background: #fff;
    border-radius: 50%;
    box-shadow: 0 3px 6px rgba(0,0,0,0.2);
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    border: none;
    padding: 0;
}

#menu-toggle {
    flex-direction: column;
}

#menu-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background: #333;
    margin: 2px 0;
    transition: all 0.3s;
}

#undo-main-btn svg {
    width: 24px;
    height: 24px;
    stroke: #333;
}

#side-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 250px;
    height: 100%;
    background: #e9e9e9;
    z-index: 6500;
    padding: 80px 20px 20px;
    box-shadow: 3px 0 6px rgba(0,0,0,0.2);
    transform: translateX(-100%);
    transition: transform 0.3s ease-in-out;
}
#side-menu.open {
    transform: translateX(0);
}

body.menu-open #game-board,
body.menu-open #ui-controls {
    transform: translateX(250px);
}

/* --- Options Modal --- */
#options-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.6);
    z-index: 8000;
    display: none;
    justify-content: center;
    align-items: center;
}
#options-modal-content {
    background-color: #eee;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.5);
    max-width: 90vw;
    max-height: 90vh;
    overflow-y: auto;
}
#options-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #ccc;
    padding-bottom: 10px;
    margin-bottom: 20px;
}
#options-modal-header h2 {
    margin: 0;
    font-family: 'Arial', sans-serif;
}
#close-modal-btn {
    font-size: 2rem;
    border: none;
    background: none;
    cursor: pointer;
}
#deck-options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 20px;
}
.deck-preview {
    width: var(--card-width);
    height: var(--card-height);
    cursor: pointer;
    border: 2px solid transparent;
    transition: border-color 0.2s;
}
.deck-preview:hover, .deck-preview.selected {
    border-color: #007bff;
    box-shadow: 0 0 10px #007bff;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

.hint-highlight {
    box-shadow: 0 0 15px 5px yellow !important;
    border: 2px solid yellow !important;
    animation: pulse-yellow 0.7s infinite alternate;
}
@keyframes pulse-yellow {
    from { box-shadow: 0 0 15px 5px yellow; }
    to { box-shadow: 0 0 25px 10px gold; }
}

/* --- Responsive Design --- */
@media (max-width: 850px) {
    :root {
        --card-width: 80px;
        --card-height: 112px;
        --overlap-offset: 20px;
        --side-spacing: 10px;
    }
    .game-area { gap: 10px; }
    .card .rank, .card .suit { font-size: 16px; }
    .card .center-suit { font-size: 40px; }
}

@media (max-width: 650px) {
    :root {
        --card-width: 60px;
        --card-height: 84px;
        --overlap-offset: 18px;
    }
    .game-area { gap: 8px; }
    .card .rank, .card .suit { font-size: 12px; }
    .card .center-suit { font-size: 30px; }
        .pile.foundation::before { font-size: 60px; }
}

@media (max-width: 480px) {
    :root {
        --card-width: 45px;
        --card-height: 63px;
        --overlap-offset: 15px;
        --top-spacing: 10px;
    }
    .game-area { gap: 5px; }
    .card .rank, .card .suit { font-size: 10px; }
    .card .center-suit { font-size: 22px; }
    .win-message { font-size: 4rem; }
    .menu-btn { padding: 10px 20px; font-size: 1.2rem; }
    .pile.foundation::before { font-size: 40px; }
}