:root {
    --bg: #121212;
    --surface: #1e1e24;
    --text: #ffffff;
    --accent: #e91e63;
    --grid-bg: #2a2a35;
    --cell-bg: #1e1e24;
    
    --spades: #90caf9;
    --clubs: #a5d6a7;
    --hearts: #ef9a9a;
    --diamonds: #ce93d8;

    --card-w: 60px;
    --card-h: 84px;
}

body:not(.dark-mode) {
    --bg: #f5f5f5;
    --surface: #ffffff;
    --text: #121212;
    --grid-bg: #e0e0e0;
    --cell-bg: #cccccc;
    
    --spades: #1565c0;
    --clubs: #2e7d32;
    --hearts: #c62828;
    --diamonds: #6a1b9a;
}

* { box-sizing: border-box; margin: 0; padding: 0; user-select: none; }

body {
    font-family: system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    overflow: hidden;
    touch-action: none;
}

#game-container {
    display: flex;
    flex-direction: column;
    height: 100dvh; /* fallback is vh if d-units not supported, but CSS assumes modern */
    padding-bottom: env(safe-area-inset-bottom);
}

/* ── Header ── */
#header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    height: 60px;
    background: var(--surface);
    font-weight: bold;
    padding-right: 60px; /* clear the settings gear */
}

#trump-display {
    font-size: 1.5rem;
}

/* ── Start Screen ── */
#start-screen {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.9);
    display: flex; flex-direction: column;
    justify-content: center; align-items: center;
    z-index: 100;
}
#start-screen h1 { font-size: 2.5rem; margin-bottom: 10px; color: var(--accent); }
#start-screen p { margin-bottom: 30px; color: #aaa; }
#start-btn {
    background: var(--accent); color: #fff;
    border: none; padding: 15px 30px; font-size: 1.2rem;
    border-radius: 8px; cursor: pointer;
    font-weight: bold;
}
#start-btn:active { opacity: 0.8; }

/* ── Game Over Screen ── */
#game-over-screen {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.9);
    display: none; flex-direction: column;
    justify-content: center; align-items: center;
    z-index: 100;
}
#game-over-screen h2 { font-size: 2rem; margin-bottom: 20px; color: #ff5252; }
#restart-btn {
    background: var(--accent); color: #fff;
    border: none; padding: 15px 30px; font-size: 1.2rem;
    border-radius: 8px; cursor: pointer;
    font-weight: bold;
}

/* ── Grid Area ── */
#grid-wrapper {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 10px;
}

#grid {
    position: relative;
    width: 300px;
    height: 300px;
    background: var(--grid-bg);
    border-radius: 8px;
    padding: 8px;
}

.grid-cell {
    position: absolute;
    width: 65px;
    height: 65px;
    background: var(--cell-bg);
    border-radius: 6px;
}

/* ── Cards ── */
.card {
    position: absolute;
    width: 65px;
    height: 65px;
    background: #fff;
    border-radius: 6px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 4px;
    color: #000;
    font-weight: bold;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
    transition: transform 0.15s ease-in-out;
    z-index: 10;
}

.card.merged {
    animation: pop 0.2s ease-out;
}

@keyframes pop {
    0% { transform: scale(1); }
    50% { transform: scale(1.15); }
    100% { transform: scale(1); }
}

.card.suit-S, .card.suit-C { color: #212121; }
.card.suit-H, .card.suit-D { color: #d32f2f; }

.card-tl { font-size: 0.9rem; line-height: 1; }
.card-center { font-size: 1.8rem; text-align: center; align-self: center; flex: 1; display: flex; align-items: center; justify-content: center; opacity: 0.2; position: absolute; inset: 0; }
.card-br { font-size: 0.9rem; line-height: 1; text-align: right; align-self: flex-end; transform: rotate(180deg); }

/* ── Action Bar ── */
#action-bar {
    height: 60px;
    background: var(--surface);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: bold;
    padding: 0 20px;
}

#end-turn-btn {
    background: var(--accent); color: #fff;
    border: none; padding: 10px 20px; font-size: 1rem;
    border-radius: 8px; cursor: pointer;
    font-weight: bold;
}
#end-turn-btn:active { opacity: 0.8; }

/* ── Combat Area ── */
#combat-area {
    flex-direction: column;
    padding: 10px;
    flex: 1; /* take up remaining space above grid */
}

#enemy-area {
    text-align: center;
    padding: 10px;
    font-weight: bold;
    color: #ff5252;
}

#bout-area {
    flex: 1;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 15px;
    padding: 10px;
    min-height: 120px;
    background: rgba(0,0,0,0.2);
    border-radius: 8px;
    margin-bottom: 10px;
}

.bout-pair {
    position: relative;
    width: 65px;
    height: 80px; /* enough space for overlapping cards */
}

/* Dragging styling */
.card.dragging {
    z-index: 1000;
    pointer-events: none;
    transform: scale(1.1) !important;
    box-shadow: 0 10px 20px rgba(0,0,0,0.5);
}

.card.combative {
    cursor: grab;
}
.card.combative:active {
    cursor: grabbing;
}

@keyframes slam {
    0% { transform: scale(1.5); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}

.bout-pair .card {
    animation: slam 0.2s ease-out;
}

/* Visual Feedback Enhancements */
.card.trump-card {
    box-shadow: 0 0 5px 2px #ffd700, 0 2px 4px rgba(0,0,0,0.2);
    border: 2px solid #ffd700;
}

@keyframes pulse-chain {
    0% { box-shadow: 0 0 5px 2px var(--accent), 0 2px 4px rgba(0,0,0,0.2); }
    50% { box-shadow: 0 0 15px 5px var(--accent), 0 2px 4px rgba(0,0,0,0.2); }
    100% { box-shadow: 0 0 5px 2px var(--accent), 0 2px 4px rgba(0,0,0,0.2); }
}

.card.valid-chain {
    animation: pulse-chain 1.5s infinite;
    border: 2px solid var(--accent);
}

.card.trump-card.valid-chain {
    animation: pulse-chain 1.5s infinite;
    border: 2px solid #ffd700;
}

.btn-danger {
    background: #f44336 !important;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-5px); }
    40%, 80% { transform: translateX(5px); }
}

.shake {
    animation: shake 0.3s cubic-bezier(.36,.07,.19,.97) both;
}