/* ===== Theme Variables ===== */
:root {
    --bg: #f0f4f0;
    --bg-secondary: #e0e8e0;
    --text: #1a1a1a;
    --text-muted: #666;
    --header-bg: #2d5a27;
    --header-text: #fff;
    --card-bg: #ffffff;
    --card-border: #c0c0c0;
    --card-shadow: 0 1px 3px rgba(0,0,0,0.15);
    --card-red: #c62828;
    --card-black: #212121;
    --card-back-bg: #1565c0;
    --card-back-pattern: repeating-linear-gradient(
        45deg, transparent, transparent 4px,
        rgba(255,255,255,0.08) 4px, rgba(255,255,255,0.08) 8px
    );
    --card-back-border: rgba(255,255,255,0.25);
    --card-width: 75px;
    --card-height: 107px;
    --card-radius: 6px;
    --card-overlap-down: 5px;
    --card-overlap-up: 24px;
    --pile-bg: rgba(0,0,0,0.06);
    --pile-border: rgba(0,0,0,0.12);
    --pile-highlight: rgba(76,175,80,0.35);
    --btn-bg: #ffffff;
    --btn-border: #ccc;
    --btn-hover: #f5f5f5;
    --modal-bg: #fff;
    --modal-overlay: rgba(0,0,0,0.5);
    --accent: #2e7d32;
    --accent-light: #4caf50;
    --variant-card-bg: #fff;
    --variant-card-border: #ddd;
    --variant-card-hover: #e8f5e9;
    --toast-bg: #333;
    --toast-text: #fff;
}

[data-theme="dark"] {
    --bg: #1a1a2e;
    --bg-secondary: #16213e;
    --text: #e0e0e0;
    --text-muted: #999;
    --header-bg: #0f3d0f;
    --card-bg: #2a2a3a;
    --card-border: #444;
    --card-shadow: 0 1px 3px rgba(0,0,0,0.4);
    --card-red: #ef5350;
    --card-black: #e0e0e0;
    --card-back-bg: #1a237e;
    --card-back-border: rgba(255,255,255,0.15);
    --pile-bg: rgba(255,255,255,0.04);
    --pile-border: rgba(255,255,255,0.1);
    --pile-highlight: rgba(76,175,80,0.3);
    --btn-bg: #2a2a3a;
    --btn-border: #555;
    --btn-hover: #333348;
    --modal-bg: #1e1e2e;
    --modal-overlay: rgba(0,0,0,0.7);
    --accent: #4caf50;
    --accent-light: #66bb6a;
    --variant-card-bg: #252540;
    --variant-card-border: #3a3a5a;
    --variant-card-hover: #1b3d1b;
    --toast-bg: #444;
}

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

html, body {
    height: 100%;
    overflow: hidden;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    -webkit-tap-highlight-color: transparent;
    user-select: none;
    -webkit-user-select: none;
}

.app {
    display: flex;
    flex-direction: column;
    height: 100%;
    max-width: 700px;
    margin: 0 auto;
    box-shadow: 0 0 20px rgba(0,0,0,0.15);
}

/* ===== Header ===== */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 16px;
    background: var(--header-bg);
    color: var(--header-text);
    flex-shrink: 0;
    z-index: 100;
}

.app-title {
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.header-actions {
    display: flex;
    gap: 8px;
    align-items: center;
}

.icon-btn {
    background: none;
    border: none;
    color: inherit;
    cursor: pointer;
    padding: 6px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.15s;
}
.icon-btn:hover { background: rgba(255,255,255,0.15); }
.icon-btn svg { width: 22px; height: 22px; }

/* ===== Game Selector ===== */
.selector-screen {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 24px;
    gap: 32px;
}

.selector-subtitle {
    font-size: 1.1rem;
    color: var(--text-muted);
}

.variant-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    max-width: 600px;
    width: 100%;
}

.variant-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 32px 16px;
    background: var(--variant-card-bg);
    border: 2px solid var(--variant-card-border);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
    color: var(--text);
}
.variant-card:hover {
    border-color: var(--accent);
    background: var(--variant-card-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.variant-icon {
    font-size: 3rem;
    line-height: 1;
}

.variant-name {
    font-size: 1.1rem;
    font-weight: 700;
}

.variant-desc {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ===== Game Screen ===== */
.game-screen {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.info-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    padding: 6px 16px;
    font-size: 0.85rem;
    color: var(--text-muted);
    flex-shrink: 0;
}

.mode-badge {
    background: var(--accent);
    color: #fff;
    padding: 2px 10px;
    border-radius: 10px;
    font-size: 0.75rem;
    font-weight: 600;
}

.game-area {
    flex: 1;
    position: relative;
    overflow: hidden;
    touch-action: none;
}

.game-controls {
    display: flex;
    justify-content: center;
    gap: 10px;
    padding: 8px 16px;
    flex-shrink: 0;
}

.action-btn {
    padding: 8px 18px;
    background: var(--btn-bg);
    border: 1px solid var(--btn-border);
    border-radius: 8px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text);
    transition: all 0.15s;
}
.action-btn:hover { background: var(--btn-hover); }
.action-btn:disabled { opacity: 0.4; cursor: default; }

.action-btn--accent {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}
.action-btn--accent:hover { background: var(--accent-light); }

/* ===== Cards ===== */
.card {
    width: var(--card-width);
    height: var(--card-height);
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--card-radius);
    box-shadow: var(--card-shadow);
    position: absolute;
    cursor: grab;
    user-select: none;
    -webkit-user-select: none;
    transition: box-shadow 0.15s;
    font-family: 'Inter', sans-serif;
    z-index: 1;
}
.card:hover:not(.card--facedown):not(.card--dragging) {
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}
.card--red { color: var(--card-red); }
.card--black { color: var(--card-black); }

.card--dragging {
    cursor: grabbing;
    box-shadow: 0 8px 24px rgba(0,0,0,0.3);
    z-index: 1000 !important;
    transition: none;
}

.card--facedown {
    cursor: pointer;
}

.card__back {
    width: 100%;
    height: 100%;
    border-radius: var(--card-radius);
    background: var(--card-back-bg);
    background-image: var(--card-back-pattern);
    border: 2px solid var(--card-back-border);
    box-sizing: border-box;
}

.card__corner {
    position: absolute;
    display: flex;
    flex-direction: column;
    align-items: center;
    line-height: 1;
}
.card__corner--top { top: 4px; left: 5px; }
.card__corner--bottom { bottom: 4px; right: 5px; transform: rotate(180deg); }

.card__rank {
    font-size: 0.9rem;
    font-weight: 700;
}
.card__suit {
    font-size: 0.7rem;
}
.card__center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}
.card__suit-large {
    font-size: 2rem;
}

.card--flip {
    animation: cardFlip 0.3s ease;
}
@keyframes cardFlip {
    0% { transform: scaleX(1); }
    50% { transform: scaleX(0); }
    100% { transform: scaleX(1); }
}

/* ===== Pile Placeholders ===== */
.pile-placeholder {
    width: var(--card-width);
    height: var(--card-height);
    border: 2px dashed var(--pile-border);
    border-radius: var(--card-radius);
    background: var(--pile-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    position: absolute;
}
.pile-placeholder__icon {
    font-size: 1.4rem;
    color: var(--pile-border);
    font-weight: 700;
}

.pile-placeholder--drop-target {
    border-color: var(--accent);
    background: var(--pile-highlight);
}

/* ===== Pile Containers ===== */
.pile {
    position: absolute;
}

.pile--drop-target .pile-placeholder {
    border-color: var(--accent);
    background: var(--pile-highlight);
}

/* ===== Drag Ghost ===== */
.drag-ghost {
    position: fixed;
    pointer-events: none;
    z-index: 2000;
}
.drag-ghost .card {
    position: relative;
    cursor: grabbing;
    box-shadow: 0 8px 24px rgba(0,0,0,0.3);
}

/* ===== Modals ===== */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: var(--modal-overlay);
    z-index: 5000;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.2s;
}
.modal-overlay.active {
    display: flex;
    opacity: 1;
}

.modal {
    background: var(--modal-bg);
    border-radius: 16px;
    padding: 32px;
    max-width: 400px;
    width: 90%;
    text-align: center;
    transform: scale(0.9);
    transition: transform 0.2s;
}
.modal-overlay.active .modal {
    transform: scale(1);
}

.modal-title {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.modal-subtitle {
    color: var(--text-muted);
    margin-bottom: 20px;
    font-size: 0.9rem;
}

.modal-options {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 16px;
}

.modal-option {
    padding: 14px;
    background: var(--btn-bg);
    border: 2px solid var(--btn-border);
    border-radius: 10px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text);
    transition: all 0.15s;
}
.modal-option:hover {
    border-color: var(--accent);
    background: var(--variant-card-hover);
}

.modal-option-desc {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 400;
    margin-top: 4px;
}

.modal-cancel {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-family: inherit;
    font-size: 0.85rem;
    margin-top: 8px;
    padding: 8px;
}
.modal-cancel:hover { color: var(--text); }

/* Win modal */
.win-icon { font-size: 3rem; margin-bottom: 8px; }

.win-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin: 20px 0;
    text-align: center;
}
.win-stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.win-stat-value {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--accent);
}

/* Stats modal */
.stats-tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 20px;
    justify-content: center;
}
.stats-tab {
    padding: 6px 16px;
    background: var(--btn-bg);
    border: 1px solid var(--btn-border);
    border-radius: 6px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.8rem;
    color: var(--text);
}
.stats-tab.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}
.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    text-align: center;
}

/* ===== Toast ===== */
.toast {
    position: fixed;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--toast-bg);
    color: var(--toast-text);
    padding: 10px 24px;
    border-radius: 8px;
    font-size: 0.85rem;
    opacity: 0;
    transition: all 0.3s;
    z-index: 6000;
    pointer-events: none;
}
.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ===== Auto-complete button ===== */
.auto-complete-btn {
    position: absolute;
    bottom: 60px;
    left: 50%;
    transform: translateX(-50%);
    padding: 10px 24px;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 10px;
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    animation: pulse 2s infinite;
    z-index: 100;
}
@keyframes pulse {
    0%, 100% { box-shadow: 0 4px 12px rgba(0,0,0,0.2); }
    50% { box-shadow: 0 4px 20px rgba(76,175,80,0.5); }
}

/* ===== Win celebration ===== */
.confetti {
    position: fixed;
    width: 10px;
    height: 10px;
    border-radius: 2px;
    z-index: 7000;
    pointer-events: none;
    animation: confettiFall linear forwards;
}
@keyframes confettiFall {
    0% { transform: translateY(0) rotate(0deg); opacity: 1; }
    100% { transform: translateY(100vh) rotate(720deg); opacity: 0; }
}

/* ===== Responsive ===== */
@media (max-width: 600px) {
    :root {
        --card-width: 46px;
        --card-height: 66px;
        --card-overlap-down: 3px;
        --card-overlap-up: 16px;
    }
    .card__rank { font-size: 0.7rem; }
    .card__suit { font-size: 0.55rem; }
    .card__suit-large { font-size: 1.3rem; }
    .card__corner--top { top: 2px; left: 3px; }
    .card__corner--bottom { bottom: 2px; right: 3px; }
    .pile-placeholder__icon { font-size: 1rem; }
    .variant-grid { grid-template-columns: 1fr; max-width: 280px; }
    .variant-card { padding: 20px 16px; }
    .game-controls { gap: 6px; padding: 6px 8px; }
    .action-btn { padding: 6px 12px; font-size: 0.8rem; }
    .info-bar { gap: 12px; font-size: 0.8rem; }
    .app-title { font-size: 1rem; }
}

@media (min-width: 601px) and (max-width: 900px) {
    :root {
        --card-width: 60px;
        --card-height: 85px;
        --card-overlap-down: 4px;
        --card-overlap-up: 20px;
    }
    .card__rank { font-size: 0.8rem; }
    .card__suit-large { font-size: 1.6rem; }
}

/* Spider 10-column needs narrower cards */
.game-area--spider {
    --card-width: 62px;
    --card-height: 89px;
    --card-overlap-up: 20px;
}
@media (max-width: 600px) {
    .game-area--spider {
        --card-width: 36px;
        --card-height: 52px;
        --card-overlap-up: 13px;
        --card-overlap-down: 2px;
    }
    .game-area--spider .card__rank { font-size: 0.6rem; }
    .game-area--spider .card__suit { font-size: 0.45rem; }
    .game-area--spider .card__suit-large { font-size: 1rem; }
}
@media (min-width: 601px) and (max-width: 900px) {
    .game-area--spider {
        --card-width: 50px;
        --card-height: 72px;
        --card-overlap-up: 16px;
    }
}

/* ===== Confirm dialog ===== */
.confirm-actions {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-top: 20px;
}