* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', system-ui, sans-serif;
}

/* =====================
   CSS VARIABLES
   ===================== */
:root {
    --primary: #6c5ce7;
    --secondary: #a8a5e6;
    --success: #00b894;
    --danger: #d63031;
    --warning: #fdcb6e;
    --background: #0f0f1f;
    --text: #f8f9fa;

    /* Mobile-first sizing - flexible cards */
    --card-size-base: 70px;
    --card-size-min: 60px;
    --card-size-max: 80px;

    --font-base: 0.875rem;
    --font-h1: 1.25rem;
    --font-h2: 1.1rem;
    --font-h3: 1rem;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
}

/* =====================
   BODY & LAYOUT
   ===================== */
body {
    background: linear-gradient(135deg, #0f0f1f 0%, #1a1a2e 100%);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-sm);
    line-height: 1.6;
    font-size: var(--font-base);
}

/* =====================
   ACCESSIBILITY
   ===================== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* =====================
   GLOBAL SCROLLBAR
   ===================== */
::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--primary) 0%, var(--secondary) 100%);
    border-radius: 10px;
    border: 2px solid rgba(15, 15, 31, 0.3);
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, var(--secondary) 0%, var(--primary) 100%);
    border-color: rgba(255, 255, 255, 0.1);
}

/* Firefox */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--primary) rgba(255, 255, 255, 0.05);
}

/* =====================
   UTILITY CLASSES
   ===================== */
.hidden {
    display: none !important;
}

.desktop-only {
    display: none;
}

/* =====================
   INFO ICON - TOP LEFT CORNER
   ===================== */
.info-corner {
    position: absolute;
    bottom: 0px;
    right: 4px;
    width: 48px;
    height: 48px;
    cursor: pointer;
    z-index: 1000;
    transition: transform 0.3s ease;
    filter: drop-shadow(0 4px 12px rgba(108, 92, 231, 0.4));
}

.info-corner:hover {
    transform: scale(1.14);
}

/* =====================
   GREETING SECTION
   ===================== */
#greeting {
    text-align: center;
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    animation: slideIn 0.6s ease-out;
    width: 100%;
    max-width: 100%;
}

.game-title {
    font-size: var(--font-h1);
    background: linear-gradient(45deg, #a8a5e6, #6c5ce7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    line-height: 1.2;
}

.greeting-text {
    font-size: var(--font-base);
    color: var(--secondary);
    font-weight: 500;
    opacity: 0.9;
}

/* =====================
   CONTAINER
   ===================== */
.container {
    width: 100%;
    max-width: 100%;
    text-align: center;
}

/* .game-description {
    color: var(--secondary);
    font-size: var(--font-base);
    margin-bottom: var(--spacing-md);
    opacity: 0.9;
} */

/* =====================
   TIMER
   ===================== */
.timer-corner {
    position: fixed;
    top: 10px;
    right: 10px;
    background: rgba(108, 92, 231, 0.2);
    border: 2px solid var(--primary);
    border-radius: 8px;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text);
    box-shadow: 0 4px 20px rgba(108, 92, 231, 0.3);
    z-index: 1000;
    transition: all 0.3s ease;
}

/* Timer warning state (≤30 seconds) */
.timer-corner.timer-warning {
    background: rgba(253, 203, 110, 0.3);
    border-color: var(--warning);
    color: var(--warning);
    animation: pulse-warning 1.5s ease-in-out infinite;
}

/* Timer critical state (≤10 seconds) */
.timer-corner.timer-critical {
    background: rgba(214, 48, 49, 0.3);
    border-color: var(--danger);
    color: var(--danger);
    animation: pulse-critical 0.8s ease-in-out infinite;
}

/* =====================
   DIFFICULTY SELECTION
   ===================== */
.difficulty-selection {
    margin: var(--spacing-md) 0;
    animation: fadeIn 0.8s ease-out;
    width: 100%;
}

.difficulty-selection h3 {
    margin-bottom: var(--spacing-md);
    font-size: var(--font-h2);
    color: var(--secondary);
}

.difficulty-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-direction: column;
    align-items: center;
}

.difficulty-btn {
    background: linear-gradient(135deg, rgba(108, 92, 231, 0.2), rgba(168, 165, 230, 0.1));
    border: 2px solid var(--primary);
    border-radius: 12px;
    padding: var(--spacing-md) var(--spacing-lg);
    cursor: pointer;
    transition: all 0.3s ease;
    width: 100%;
    max-width: 310px;
    min-height: 80px;
    backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    flex: 1 1 0;
    min-width: 0;
}

.difficulty-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(108, 92, 231, 0.4);
    border-color: var(--secondary);
    background: linear-gradient(135deg, rgba(108, 92, 231, 0.3), rgba(168, 165, 230, 0.2));
}

.difficulty-label {
    font-size: var(--font-h3);
    font-weight: 700;
    color: var(--text);
    margin-bottom: var(--spacing-xs);
}

.difficulty-desc {
    font-size: 0.85rem;
    color: var(--secondary);
}

/* =====================
   GAME BOARD - ADAPTIVE GRID
   ===================== */
.game-board {
    gap: var(--spacing-sm);
    margin: var(--spacing-md) auto;
    padding: var(--spacing-sm);
    justify-content: center;
    max-width: 100%;
    width: 100%;
}

.game-board-active {
    display: grid;
}

/* Default: Very narrow screens (< 350px) - 3 columns */
.game-board-cols-4 {
    grid-template-columns: repeat(3, minmax(70px, 85px));
}

.game-board-cols-6 {
    grid-template-columns: repeat(3, minmax(70px, 85px));
}

/* =====================
   MEMORY CARDS - FLEXIBLE SIZING
   ===================== */
.memory-card {
    width: 100%;
    max-width: var(--card-size-max);
    min-width: var(--card-size-min);
    aspect-ratio: 1;
    perspective: 1000px;
    cursor: pointer;
    margin: 0 auto;
}

.card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.6s;
    transform-style: preserve-3d;
}

.memory-card.flipped .card-inner,
.memory-card.matched .card-inner {
    transform: rotateY(180deg);
}

.card-front,
.card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.card-back {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    font-size: clamp(1.5rem, 4vw, 1.8rem);
    color: white;
    font-weight: 700;
}

.card-front {
    background: white;
    transform: rotateY(180deg);
    padding: var(--spacing-xs);
}

.card-front img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 6px;
}

.memory-card.matched {
    pointer-events: none;
}

.memory-card.matched .card-front {
    background: linear-gradient(135deg, rgba(0, 184, 148, 0.2), rgba(0, 184, 148, 0.1));
    border: 2px solid var(--success);
}

/* =====================
   STATS SECTION (DESKTOP ONLY)
   ===================== */
.stats-container {
    display: none;
    gap: var(--spacing-lg);
    margin: var(--spacing-xl) auto;
    max-width: 1200px;
    width: 100%;
}

.stats-table {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    padding: var(--spacing-lg);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    flex: 1;
}

.stats-table h3 {
    color: var(--secondary);
    font-size: var(--font-h2);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.stats-table table {
    width: 100%;
    border-collapse: collapse;
}

.stats-table th {
    background: rgba(108, 92, 231, 0.3);
    color: var(--text);
    padding: var(--spacing-sm) var(--spacing-md);
    text-align: center;
    font-weight: 600;
    font-size: 0.9rem;
    border-bottom: 2px solid rgba(108, 92, 231, 0.5);
}

.stats-table td {
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text);
    font-size: 0.85rem;
    text-align: center;
}

.stats-table tr:hover {
    background: rgba(108, 92, 231, 0.1);
    transition: background 0.2s ease;
}

.stats-table tbody tr:last-child td {
    border-bottom: none;
}

.rank-medal {
    font-size: 1.2rem;
    margin-right: var(--spacing-xs);
}

.win-badge {
    background: rgba(0, 184, 148, 0.3);
    color: var(--success);
    padding: 0.25rem 0.6rem;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 700;
    border: 1px solid rgba(0, 184, 148, 0.4);
    display: inline-block;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.loss-badge {
    background: rgba(214, 48, 49, 0.3);
    color: var(--danger);
    padding: 0.25rem 0.6rem;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 700;
    border: 1px solid rgba(214, 48, 49, 0.4);
    display: inline-block;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.profit-cell {
    font-weight: 600;
    font-size: 0.9rem;
}

/* =====================
   CLOSE BUTTON
   ===================== */
#closeBtn {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-base);
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

/* Initial state - red "Pabėgti?" */
.close-btn-initial {
    background: rgba(214, 48, 49, 0.2);
    border: 2px solid var(--danger);
    color: var(--text);
}

.close-btn-initial:hover {
    background: var(--danger);
    transform: scale(1.05);
    box-shadow: 0 5px 20px rgba(214, 48, 49, 0.4);
}

/* Return state - green "Grįžti į Viktoriną" */
.close-btn-return {
    background: rgba(0, 184, 148, 0.2);
    border: 2px solid var(--success);
    color: var(--text);
}

.close-btn-return:hover {
    background: var(--success);
    transform: scale(1.05);
    box-shadow: 0 5px 20px rgba(0, 184, 148, 0.4);
}

/* ==================
   MODAL
   ================== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    animation: fadeIn 0.3s ease;
    padding: var(--spacing-md);
}

.modal-content {
    background: linear-gradient(135deg, #1a1a2e 0%, #0f0f1f 100%);
    border: 2px solid var(--primary);
    border-radius: 5px;
    padding: var(--spacing-md);
    max-width: 90%;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    animation: slideIn 0.4s ease-out;
}

.modal-content::-webkit-scrollbar {
    width: 8px;
}

.modal-content::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
}

.modal-content::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 10px;
}

.modal-content::-webkit-scrollbar-thumb:hover {
    background: var(--secondary);
}

.modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    font-size: 1.5rem;
    color: var(--secondary);
    cursor: pointer;
    transition: all 0.3s ease;
    line-height: 1;
}

.modal-close:hover {
    color: var(--danger);
    transform: scale(1.2);
}

.modal-content h2 {
    color: var(--secondary);
    margin-bottom: var(--spacing-md);
    font-size: 1.1rem;
    padding-right: var(--spacing-xl);
}

.rules-text h3 {
    color: var(--primary);
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    font-size: 0.95rem;
}

.rules-text p {
    color: var(--text);
    line-height: 1.6;
    margin-bottom: var(--spacing-sm);
    font-size: 0.8rem;
}

.rules-text ol,
.rules-text ul {
    color: var(--text);
    line-height: 1.6;
    padding-left: 1.2rem;
    margin-bottom: var(--spacing-sm);
}

.rules-text li {
    margin-bottom: 0.3rem;
    font-size: 0.8rem;
}

.rules-text strong {
    color: var(--secondary);
}

.good-luck {
    text-align: center;
    font-size: var(--font-h3);
    margin-top: var(--spacing-md);
    color: var(--success);
    font-weight: 600;
}

.winnings-table {
    background: rgba(108, 92, 231, 0.1);
    border-radius: 10px;
    padding: var(--spacing-sm);
    margin: var(--spacing-sm) 0;
}

.winnings-row {
    margin-bottom: var(--spacing-sm);
}

.winnings-row:last-child {
    margin-bottom: 0;
}

.winnings-row strong {
    color: var(--secondary);
    font-size: 0.85rem;
    display: block;
    margin-bottom: 0.2rem;
}

.winnings-row ul {
    margin-top: 0.2rem;
    padding-left: 1rem;
}

.winnings-row li {
    font-size: 0.75rem;
    color: var(--text);
    margin-bottom: 0.2rem;
}

.win-amount {
    color: var(--success);
    font-weight: 700;
}

/* ================
   ANIMATIONS
   ================ */
@keyframes slideIn {
    from {
        transform: translateY(-30px);
        opacity: 0;
    }

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

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes pulse-warning {

    0%,
    100% {
        transform: scale(1);
        box-shadow: 0 4px 20px rgba(253, 203, 110, 0.3);
    }

    50% {
        transform: scale(1.05);
        box-shadow: 0 8px 30px rgba(253, 203, 110, 0.6);
    }
}

@keyframes pulse-critical {

    0%,
    100% {
        transform: scale(1);
        box-shadow: 0 4px 20px rgba(214, 48, 49, 0.4);
    }

    50% {
        transform: scale(1.1);
        box-shadow: 0 10px 40px rgba(214, 48, 49, 0.8);
    }
}

/* =====================
   SMALL MOBILE (min-width: 320px)
   ===================== */
@media (min-width: 320px) {

    /* Fix greeting section for narrow screens */
    #greeting {
        padding: var(--spacing-sm);
    }

    .game-title {
        font-size: 1.1rem;
        margin-bottom: var(--spacing-xs);
    }

    .greeting-text {
        display: flex;
        align-items: center;
        justify-content: center;
        flex-wrap: wrap;
        gap: 0.3rem;
        font-size: 0.8rem;
    }

    .greeting-animation {
        width: 50px !important;
        height: 50px !important;
        margin-right: 0 !important;
    }

    /* Show stats tables from 320px */
    .stats-container {
        display: flex;
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .stats-table {
        padding: var(--spacing-sm);
    }

    .stats-table h3 {
        font-size: 0.95rem;
        margin-bottom: var(--spacing-sm);
    }

    .stats-table th {
        padding: 0.4rem 0.5rem;
        font-size: 0.75rem;
    }

    .stats-table td {
        padding: 0.4rem 0.5rem;
        font-size: 0.7rem;
    }

    .rank-medal {
        font-size: 1rem;
        margin-right: 0.15rem;
    }

    .win-badge,
    .loss-badge {
        padding: 0.15rem 0.4rem;
        font-size: 0.65rem;
    }

    .profit-cell {
        font-size: 0.75rem;
    }
}

/* =====================
   SMALL MOBILE (min-width: 350px)
   ===================== */
@media (min-width: 350px) {
    .game-board-cols-4 {
        grid-template-columns: repeat(4, minmax(60px, 70px));
    }

    .game-board-cols-6 {
        grid-template-columns: repeat(4, minmax(55px, 65px));
    }
}

/* =====================
   SMALL MOBILE (min-width: 360px)
   ===================== */
@media (min-width: 360px) {
    :root {
        --card-size-base: 60px;
        --card-size-min: 55px;
        --card-size-max: 65px;
    }

    /* 4 columns for easy/medium */
    .game-board-cols-4 {
        grid-template-columns: repeat(4, minmax(var(--card-size-min), var(--card-size-max)));
    }

    /* 4 columns for hard (still 4 until 500px) */
    .game-board-cols-6 {
        grid-template-columns: repeat(4, minmax(55px, 65px));
    }
}

@media (min-width: 400px) {
    .difficulty-buttons {
        flex-direction: row;
        gap: var(--spacing-lg);
    }

}

/* =====================
   MEDIUM MOBILE (min-width: 480px)
   ===================== */
@media (min-width: 480px) {
    :root {
        --card-size-base: 65px;
        --card-size-min: 60px;
        --card-size-max: 75px;
    }

    /* Easy/Medium: 4 columns with larger cards */
    .game-board-cols-4 {
        grid-template-columns: repeat(4, minmax(var(--card-size-min), var(--card-size-max)));
    }

    /* Hard: still 4 columns until 500px */
    .game-board-cols-6 {
        grid-template-columns: repeat(4, minmax(60px, 75px));
    }
}

/* =====================
   WIDE MOBILE (min-width: 500px)
   ===================== */
@media (min-width: 500px) {

    /* Hard mode: switch to 6 columns for perfect 6x4 grid */
    .game-board-cols-6 {
        grid-template-columns: repeat(6, minmax(55px, 70px));
    }

    .card-back {
        font-size: clamp(1.8rem, 4vw, 2.2rem);
    }
}

/* =====================
   TABLET (min-width: 768px)
   ===================== */
@media (min-width: 768px) {
    :root {
        --card-size-base: 90px;
        --card-size-min: 85px;
        --card-size-max: 100px;

        --font-base: 1rem;
        --font-h1: 1.5rem;
        --font-h2: 1.3rem;
        --font-h3: 1.1rem;
        --spacing-sm: 0.75rem;
        --spacing-md: 1.25rem;
        --spacing-lg: 2rem;
        --spacing-xl: 2.5rem;
    }

    body {
        padding: var(--spacing-md);
    }

    #greeting {
        padding: var(--spacing-lg);
    }

    .info-corner {
        top: 20px;
        left: 20px;
        width: 56px;
        height: 56px;
    }

    .difficulty-btn {
        max-width: 220px;
        padding: var(--spacing-lg) var(--spacing-xl);
    }

    .game-board {
        gap: var(--spacing-md);
        padding: var(--spacing-md);
    }

    /* Full 4 and 6 column layouts on tablet */
    .game-board-cols-4 {
        grid-template-columns: repeat(4, minmax(var(--card-size-min), var(--card-size-max)));
    }

    .game-board-cols-6 {
        grid-template-columns: repeat(6, minmax(var(--card-size-min), var(--card-size-max)));
    }

    .timer-corner {
        top: 20px;
        right: 20px;
        padding: var(--spacing-md) var(--spacing-lg);
        font-size: 1.5rem;
    }

    .card-back {
        font-size: clamp(2.2rem, 3vw, 2.5rem);
    }

    .modal-content {
        max-width: 550px;
        padding: var(--spacing-lg);
    }

    .modal-content h2 {
        font-size: 1.3rem;
    }

    .rules-text h3 {
        font-size: 1.05rem;
    }

    .rules-text p,
    .rules-text li {
        font-size: 0.9rem;
    }

    .winnings-row li {
        font-size: 0.85rem;
    }

    .modal-close {
        font-size: 2rem;
    }

    .desktop-only {
        display: block;
    }

    .stats-container {
        display: flex;
        flex-direction: column;
    }
}

/* =====================
   DESKTOP (min-width: 1024px)
   ===================== */
@media (min-width: 1024px) {
    :root {
        --card-size-base: 110px;
        --card-size-min: 105px;
        --card-size-max: 120px;

        --font-base: 1.1rem;
        --font-h1: 1.8rem;
        --font-h2: 1.5rem;
        --font-h3: 1.2rem;
    }

    .container {
        max-width: 1200px;
    }

    .info-corner {
        top: 30px;
        left: 30px;
        width: 64px;
        height: 64px;
    }

    .difficulty-btn {
        max-width: 240px;
    }

    .card-back {
        font-size: clamp(2.5rem, 2.5vw, 3rem);
    }

    .stats-container {
        flex-direction: row;
    }

    .stats-table th {
        font-size: 1rem;
    }

    .stats-table td {
        font-size: 0.95rem;
    }
}

/* =====================
   LARGE DESKTOP (min-width: 1440px)
   ===================== */
@media (min-width: 1440px) {
    :root {
        --card-size-base: 120px;
        --card-size-min: 115px;
        --card-size-max: 130px;

        --font-base: 1.125rem;
        --font-h1: 2rem;
        --font-h2: 1.6rem;
        --font-h3: 1.3rem;
    }

    .card-back {
        font-size: 3rem;
    }
}