:root {
    --bg-color: #f0f8ff;
    --bg-gradient: radial-gradient(circle, #f0f8ff 0%, #e0f0ff 100%);
    --panel-bg: white;
    --setting-card-bg: #f8f9fa;
    --setting-card-main-bg: #e8f5e9;
    --setting-card-border: #eee;
    --text-color: #333;
    --text-muted: #666;
    --hud-bg: rgba(255, 255, 255, 0.7);
    
    --primary-color: #4caf50;
    --primary-hover: #45a049;
    --danger-color: #f44336;
    --card-width: 108px;
    --card-height: 187px;
    --card-radius: 12px;
    
    /* Card Suits */
    --hearts-color: #e91e63;
    --leaves-color: #4caf50;
    --bells-color: #ffc107;
    --acorns-color: #795548;
}

.dark-mode {
    --bg-color: #1a1a2e;
    --bg-gradient: radial-gradient(circle, #1a1a2e 0%, #16213e 100%);
    --panel-bg: #22223b;
    --setting-card-bg: #2a2a40;
    --setting-card-main-bg: #1b4332;
    --setting-card-border: #444;
    --text-color: #f8f9fa;
    --text-muted: #adb5bd;
    --hud-bg: rgba(34, 34, 59, 0.8);
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    overflow: hidden;
    user-select: none;
    -webkit-user-select: none;
    -webkit-touch-callout: none;
    transition: background-color 0.3s, color 0.3s;
}

@media (max-height: 850px), (max-width: 900px) {
    :root {
        --card-width: 78px;
        --card-height: 136px;
    }
    
    #game-container {
        justify-content: flex-start !important;
    }

    #game-board {
        padding: 5px;
        height: 70% !important;
    }

    #center-piles {
        gap: 15px;
    }
    
    .big-button {
        padding: 10px 25px;
        font-size: 1.2rem;
    }

    .panel {
        padding: 1.2rem !important;
        width: calc(100% - 40px) !important;
        box-sizing: border-box;
        gap: 10px !important;
        margin-top: 20px;
    }

    .welcome-header {
        margin-top: 5px !important;
        margin-bottom: 5px !important;
    }

    .welcome-header h1 {
        font-size: 1.6rem !important;
    }

    .setting-card {
        padding: 6px 12px !important;
    }

    .rules-container-card {
        padding: 0 !important;
    }

    .rules-toggle-header {
        padding: 6px 12px !important;
    }

    .setting-label {
        font-size: 0.9rem !important;
    }
}

#game-container {
    width: 100vw;
    height: 100vh; /* fallback for older browsers */
    height: 100dvh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    background: var(--bg-gradient);
}

.hidden {
    display: none !important;
}

/* Panels */
.panel {
    background: var(--panel-bg);
    padding: 2.5rem;
    border-radius: 32px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.1);
    text-align: center;
    max-width: 450px;
    width: 90%;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    gap: 20px;
    position: relative; /* For absolute corner icons */
    transition: background-color 0.3s;
}

.settings-scroll-area {
    overflow-y: auto;
    flex: 1;
    min-height: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 5px;
    margin: -5px; /* offset padding */
}

/* Custom scrollbar for settings */
.settings-scroll-area::-webkit-scrollbar {
    width: 6px;
}
.settings-scroll-area::-webkit-scrollbar-track {
    background: transparent;
}
.settings-scroll-area::-webkit-scrollbar-thumb {
    background-color: var(--setting-card-border);
    border-radius: 10px;
}

.corner-icon {
    position: absolute;
    width: 70px;
    height: 70px;
    mix-blend-mode: multiply;
    pointer-events: none;
}

.dark-mode .corner-icon {
    filter: invert(1) hue-rotate(180deg);
    mix-blend-mode: screen; /* Makes black background transparent */
    opacity: 0.85;
}

.visual-settings {
    margin-top: 10px;
    padding-top: 10px;
}

.visual-settings .setting-card {
    background: transparent;
    border: none;
    padding: 5px 16px;
}

.dark-mode #game-status {
    background: rgba(30, 30, 50, 0.9);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 4px 15px rgba(0,0,0,0.5);
}

.corner-icon.top-left {
    top: 20px;
    left: 15px;
}

.corner-icon.top-right {
    top: 20px;
    right: 15px;
}

.welcome-header {
    margin-bottom: 10px;
    margin-top: 10px;
}

.welcome-header h1 {
    font-size: 2.5rem;
    margin: 0;
    color: var(--text-color);
    font-weight: 800;
}

.welcome-header p {
    color: var(--text-muted);
    margin: 5px 0 0 0;
    font-size: 1.2rem;
}

.settings-grid {
    display: flex;
    flex-direction: column;
    gap: 15px;
    text-align: left;
}

.setting-card {
    background: var(--setting-card-bg);
    border: 2px solid var(--setting-card-border);
    padding: 12px 16px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all 0.2s;
}

.setting-card.main-mode {
    background: var(--setting-card-main-bg);
    border-color: var(--setting-card-border);
    padding: 16px;
}

.setting-info {
    display: flex;
    flex-direction: column;
}

.setting-label {
    font-weight: 700;
    color: var(--text-color);
    font-size: 1rem;
}

.setting-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.advanced-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
    margin-top: 10px;
    padding: 0 16px 16px 16px;
    overflow: hidden;
    transition: max-height 0.3s ease-in-out, opacity 0.3s ease-in-out, padding 0.3s ease-in-out, margin-top 0.3s ease-in-out;
}

.advanced-grid.collapsed {
    max-height: 0 !important;
    opacity: 0;
    margin: 0;
    padding: 0 16px 0 16px;
    pointer-events: none;
}

@media (max-width: 600px) {
    .advanced-grid {
        grid-template-columns: 1fr;
    }
}

.rules-container-card {
    flex-direction: column;
    align-items: stretch;
    padding: 0;
    margin-top: 5px;
    margin-bottom: 5px;
}

.rules-toggle-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    cursor: pointer;
    border-radius: 16px;
    transition: background-color 0.2s;
}

.rules-toggle-header:hover {
    background-color: rgba(0,0,0,0.02);
}

.dark-mode .rules-toggle-header:hover {
    background-color: rgba(255,255,255,0.03);
}

.inner-setting-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 4px 0;
}

.rules-toggle-icon {
    font-size: 0.9rem;
    transition: transform 0.3s ease, color 0.3s;
    color: var(--text-muted);
}

.rules-toggle-header.open .rules-toggle-icon {
    transform: rotate(180deg);
    color: var(--primary-color);
}

.settings-actions {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 10px;
}

.big-button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 18px 45px;
    font-size: 1.6rem;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 8px 20px rgba(76, 175, 80, 0.3);
    font-weight: 700;
}

.close-btn {
    position: absolute;
    top: 0;
    right: 5px;
    background: transparent;
    border: none;
    font-size: 1.4rem;
    cursor: pointer;
    color: var(--text-muted);
    z-index: 200;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s, transform 0.2s;
}

.close-btn:hover {
    color: var(--text-color);
    transform: scale(1.1);
}

.rule-hint {
    font-size: 0.8rem;
    color: var(--danger-color);
    margin: 5px 0 0 0;
    opacity: 0.8;
}

@media (max-height: 850px), (max-width: 900px) {
    .panel {
        padding: 1.2rem !important;
        gap: 10px !important;
    }

    .welcome-header {
        margin-top: 5px !important;
        margin-bottom: 5px !important;
    }

    .welcome-header h1 {
        font-size: 1.6rem !important;
    }

    .welcome-header p {
        font-size: 0.9rem !important;
    }

    .settings-grid {
        gap: 8px !important;
    }
}

@media (hover: hover) {
    .big-button:hover {
        background-color: var(--primary-hover);
        transform: translateY(-3px) scale(1.02);
        box-shadow: 0 12px 25px rgba(76, 175, 80, 0.4);
    }
    #draw-pile:hover {
        transform: scale(1.05);
    }
    #player-hand .card:hover {
        z-index: 100;
        transform: translateY(-15px);
        box-shadow: 0 10px 20px rgba(0,0,0,0.3);
    }
    .color-btn:hover { 
        transform: scale(1.1); 
        border-color: var(--primary-color);
    }
    #menu-btn:hover {
        opacity: 1;
        transform: rotate(45deg);
    }
    .close-btn:hover {
        color: var(--text-color);
        transform: scale(1.1);
    }
}

/* Switches */
.switch {
    position: relative;
    display: inline-block;
    width: 54px;
    height: 30px;
    flex-shrink: 0;
}

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

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
    border-radius: 30px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 22px;
    width: 22px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

input:checked + .slider {
    background-color: var(--primary-color);
}

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

/* Game Board Layout */
#game-board {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    box-sizing: border-box;
}

#opponent-area, #player-area {
    width: 100%;
    max-width: 100vw;
    position: relative;
}

#player-area {
    padding-bottom: 20px;
}

.hand {
    display: flex;
    justify-content: center;
    align-items: flex-end;
    min-height: calc(var(--card-height) + 50px);
    width: 100%;
    perspective: 1000px;
    padding: 0 20px;
    box-sizing: border-box;
    overflow: visible;
}

#opponent-hand {
    align-items: flex-start;
}

#center-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 20px;
    position: relative;
    width: 100%;
    margin: 10px 0;
}

#center-piles {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 30px;
    position: relative;
}

#draw-pile-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.pile {
    width: var(--card-width);
    height: var(--card-height);
    position: relative;
    touch-action: manipulation;
    transition: transform 0.2s, box-shadow 0.2s;
}

#draw-pile {
    cursor: pointer;
}

#draw-count {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-weight: bold;
    color: white;
    background: rgba(0,0,0,0.5);
    padding: 2px 8px;
    border-radius: 10px;
    pointer-events: none;
}

/* Card Styling */
.card {
    width: var(--card-width);
    height: var(--card-height);
    border-radius: var(--card-radius);
    border: 1px solid #000;
    box-sizing: border-box;
    box-shadow: 2px 2px 8px rgba(0,0,0,0.2);
    cursor: pointer;
    transition: transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275),
                margin 0.2s,
                box-shadow 0.2s,
                filter 0.2s;
    position: relative;
    background-size: 104%;
    background-repeat: no-repeat;
    background-position: center;
    flex-shrink: 0;
    overflow: hidden;
}

#player-hand .card {
    /* base styles handled by .card */
}

#opponent-hand .card {
    filter: brightness(0.9);
    cursor: default;
}

/* Selected state for two-step play */
.card.selected {
    transform: translateY(-40px) scale(1.1) !important;
    z-index: 500 !important;
    box-shadow: 0 10px 25px rgba(0,0,0,0.4);
}

/* Dim others when a card is selected */
.hand.has-selection .card:not(.selected) {
    filter: brightness(0.7) grayscale(0.2);
    opacity: 0.8;
}

#discard-pile .card {
    cursor: default;
    pointer-events: none;
}

.card.playable {
    box-shadow: 0 0 15px var(--primary-color), 0 0 25px var(--primary-color);
}

.card.dimmed {
    opacity: 0.8;
    filter: grayscale(0.5);
    cursor: not-allowed;
}

.card-back {
    width: 100%;
    height: 100%;
    background-image: url('assets/back.webp');
    background-size: 110%;
    background-repeat: no-repeat;
    background-position: center;
    border-radius: calc(var(--card-radius) - 1px);
    border: 1px solid #000;
    box-sizing: border-box;
    box-shadow: inset 0 0 10px rgba(0,0,0,0.1);
    position: absolute;
    top: 0;
    left: 0;
    z-index: 2;
    transform: scale(1.05);
}

/* Suit picker */
#suit-picker {
    position: absolute;
    background: var(--panel-bg);
    padding: 20px;
    border-radius: 20px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.2);
    z-index: 1000;
    top: -100px;
    display: flex;
    flex-direction: column;
    align-items: center;
    color: var(--text-color);
}

.color-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-top: 10px;
}

.color-btn {
    width: 70px;
    height: 70px;
    border: 2px solid transparent;
    border-radius: 15px;
    cursor: pointer;
    transition: transform 0.1s, border-color 0.1s;
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    background-color: white;
}

.color-btn.hearts { background-image: url('assets/srdce.webp'); }
.color-btn.leaves { background-image: url('assets/zelene.webp'); }
.color-btn.bells { background-image: url('assets/kule.webp'); }
.color-btn.acorns { background-image: url('assets/zaludy.webp'); }

/* HUD */
#game-status {
    text-align: center;
    font-size: 1.2rem;
    background: white; /* Always white for readability */
    color: #333; /* Always dark text */
    padding: 12px 25px;
    border-radius: 20px;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.15);
    border: 2px solid rgba(0,0,0,0.05);
    transition: transform 0.3s;
    font-weight: 600;
}

/* In dark mode we just make the shadow stronger so it pops from the dark board */
.dark-mode #game-status {
    box-shadow: 0 8px 25px rgba(0,0,0,0.4);
    background: #f8f9fa; /* Slightly off-white to be less blinding */
}

.status-icon {
    width: 24px;
    height: 24px;
    vertical-align: middle;
    margin-right: 5px;
}

#draw-pile.playable {
    border: 2px solid var(--primary-color);
    box-shadow: 0 0 15px var(--primary-color);
    animation: pulse 1.5s infinite;
    border-radius: var(--card-radius);
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

#menu-btn {
    position: absolute;
    top: 5px;
    right: 0;
    background: transparent;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    width: 50px;
    height: 50px;
    z-index: 1500;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.9;
    transition: opacity 0.2s, transform 0.2s;
    color: var(--text-color);
}

/* Result Overlay */
#overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 3000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.4s ease;
}

#overlay:not(.hidden) {
    opacity: 1;
    visibility: visible;
}

.result-card {
    background: var(--panel-bg);
    padding: 3rem 2rem;
    border-radius: 40px;
    box-shadow: 0 25px 60px rgba(0,0,0,0.3);
    text-align: center;
    max-width: 400px;
    width: calc(100% - 40px);
    box-sizing: border-box;
    transform: scale(0.8);
    transition: transform 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    position: relative;
    overflow: hidden;
}

#overlay:not(.hidden) .result-card {
    transform: scale(1);
}

#result-message {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-color);
    line-height: 1.2;
    margin: 0;
}

.result-emoji {
    font-size: 5rem;
    margin-bottom: 10px;
    display: block;
}

/* Animations */
.flying-card {
    position: fixed;
    z-index: 1000;
    pointer-events: none;
    transition: all 0.6s cubic-bezier(0.2, 0.8, 0.2, 1);
    background-size: 103%;
    background-repeat: no-repeat;
    background-position: center;
    border-radius: var(--card-radius);
    border: 1px solid #000;
    box-sizing: border-box;
    box-shadow: 5px 5px 15px rgba(0,0,0,0.3);
}