@font-face {
    font-family: 'Huninn';
    src:
        url('jf-openhuninn-2.1-subset.woff2') format('woff2'),
        url('jf-openhuninn-2.1-subset.woff') format('woff');
    font-weight: normal;
    font-style: normal;
    font-display: swap;
    unicode-range: U+21, U+24-25, U+28-29, U+2D-3A, U+3C-3E, U+41-50, U+53-54, U+56-57, U+59, U+5B, U+5D, U+61-70, U+72-7B, U+7D, U+C2, U+CD, U+D3, U+E0-E2, U+EA, U+EC-EE, U+F2-F3, U+F9-FA, U+101, U+12A-12B, U+14C, U+16A, U+30D, U+358, U+207F;
}

@font-face {
    font-family: 'Huninn';
    src:
        local('jf-openhuninn-2.1.ttf'),
        url('jf-openhuninn-2.1.ttf') format('truetype');
    font-weight: normal;
    font-style: normal;
    font-display: swap;
}

/* ==========================================================================
   Variables
   ========================================================================== */
:root {
    /* Cyberpunk 2077 Color Palette */
    --cp-yellow: #FCE300;
    /* Vibrant Cyberpunk Yellow */
    --cp-cyan: #00F0FF;
    /* Electric Cyan */
    --cp-magenta: #FF006E;
    /* Hot Pink/Magenta */
    --cp-red: #FF003C;
    /* Danger Red */
    --cp-blue: #00A8FF;
    /* Bright Blue */
    --cp-purple: #B967FF;
    /* Neon Purple */
    --cp-dark-bg: #0A0E27;
    /* Deep Dark Blue */
    --cp-darker-bg: #050A1F;
    /* Almost Black with Blue Tint */
    --cp-panel-bg: rgba(10, 14, 39, 0.95);
    --cp-tile-bg: rgba(15, 20, 50, 0.95);
    --cp-tile-border: rgba(252, 227, 0, 0.5);
    --cp-green: #00FF41;
    /* Matrix Green */

    /* Legacy aliases for compatibility */
    --neon-cyan: var(--cp-cyan);
    --neon-magenta: var(--cp-magenta);
    --neon-yellow: var(--cp-yellow);
    --neon-pink: var(--cp-magenta);
    --neon-blue: var(--cp-blue);
    --cyber-purple: var(--cp-purple);
    --dark-bg: var(--cp-dark-bg);
    --darker-bg: var(--cp-darker-bg);
    --panel-bg: var(--cp-panel-bg);
    --tile-bg: var(--cp-tile-bg);
    --tile-border: var(--cp-tile-border);
}

/* ==========================================================================
   Reset & Base
   ========================================================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Huninn';
}

body {
    background: var(--dark-bg);
    color: var(--neon-cyan);
    overflow-x: hidden;
    min-height: 100vh;
    position: relative;
}

/* ==========================================================================
   Backgrounds
   ========================================================================== */
.cyberpunk-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(ellipse at 20% 30%, rgba(31, 143, 255, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 70%, rgba(255, 179, 0, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(102, 255, 255, 0.1) 0%, transparent 60%),
        linear-gradient(180deg, #020B14 0%, #000000 100%);
    z-index: -2;
}

.grid-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        linear-gradient(rgba(102, 255, 255, 0.1) 1px, transparent 1px),
        linear-gradient(90deg, rgba(102, 255, 255, 0.1) 1px, transparent 1px);
    background-size: 50px 50px;
    z-index: -1;
    animation: gridScroll 20s linear infinite;
}

/* ==========================================================================
   Animations
   ========================================================================== */
@keyframes gridScroll {
    0% {
        transform: translateY(0);
    }

    100% {
        transform: translateY(50px);
    }
}

@keyframes glitch {

    0%,
    90%,
    100% {
        transform: translate(0);
    }

    92% {
        transform: translate(-2px, 2px);
    }

    94% {
        transform: translate(2px, -2px);
    }

    96% {
        transform: translate(-2px, -2px);
    }

    98% {
        transform: translate(2px, 2px);
    }
}

@keyframes scanline {
    0% {
        left: -100%;
    }

    100% {
        left: 100%;
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes modalSlide {
    from {
        transform: translateY(-100px);
        opacity: 0;
    }

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

@keyframes cardEntrance {
    0% {
        opacity: 0;
        transform: scale(0.3) rotateY(180deg);
        filter: brightness(3) blur(5px);
    }

    50% {
        filter: brightness(1.5) blur(2px);
    }

    100% {
        opacity: 1;
        transform: scale(1) rotateY(0deg);
        filter: brightness(1) blur(0);
    }
}

@keyframes matchPulse {

    0%,
    100% {
        transform: rotateY(180deg) scale(1);
    }

    50% {
        transform: rotateY(180deg) scale(1.1);
        box-shadow: 0 0 50px currentColor;
    }
}

/* ==========================================================================
   Layout
   ========================================================================== */
.container {
    max-width: 1400px;
    width: 100%;
    height: 100vh;
    margin: 0 auto;
    padding: 0.2rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    overflow: hidden;
}

.main-header {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    align-self: center;
    width: 100%;
    max-width: 768px;
    padding: 0.75rem 1rem;
    background: rgba(10, 10, 20, 0.8);
    border-bottom: 2px solid rgba(252, 227, 0, 0.5);
    box-shadow: 0 0 20px rgba(252, 227, 0, 0.2);
    margin-bottom: 0.5rem;
    flex-shrink: 0;
    z-index: 100;
    backdrop-filter: blur(5px);
    gap: 0.2rem;
}

.header-bottom-row {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    width: 100%;
}

.title-section {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    text-align: center;
    width: 100%;
    margin: 1rem auto;
}

.game-container {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    flex: 1;
    min-height: 0;
    padding: 0.5rem;
    overflow: hidden;
    position: relative;
    width: 100%;
    max-width: 768px;
    margin: 0 auto;
}

.game-board {
    display: grid;
    gap: 0.5rem;
    margin: 0 auto;
    padding: 0.5rem;
    padding-bottom: 6rem;
    /* Use CSS variables set by JS */
    grid-template-columns: repeat(var(--grid-cols, 4), 1fr);
    grid-template-rows: repeat(var(--grid-rows, 4), 1fr);
    width: 100%;
    height: 100%;
}

/* ==========================================================================
   Typography
   ========================================================================== */
.neon-title {
    font-size: 3rem;
    font-weight: 900;
    margin: 0;
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 0.8rem;
    justify-content: center;
}

.glitch {
    position: relative;
    color: var(--cp-yellow);
    text-shadow:
        0 0 10px var(--cp-yellow),
        0 0 20px var(--cp-yellow),
        0 0 40px var(--cp-yellow),
        0 0 80px var(--cp-yellow);
    animation: glitch 3s infinite;
}

.subtitle {
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: 0.05rem;
    color: var(--cp-red);
    text-shadow:
        0 0 5px var(--cp-red),
        0 0 10px var(--cp-red);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    text-align: left;
    padding-left: 1rem;
}

/* ==========================================================================
   Components: Controls
   ========================================================================== */
.control-buttons {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.4rem;
    width: 100%;
    align-items: center;
}

.control-buttons .cyber-btn {
    flex-shrink: 0;
    padding: 0.6rem 1rem;
    font-size: 1.4rem;
}

.cyber-btn {
    position: relative;
    padding: 0.75rem 1rem;
    background: var(--panel-bg);
    border: 2px solid var(--cp-cyan);
    color: var(--cp-cyan);
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.1rem;
    cursor: pointer;
    overflow: hidden;
    transition: all 0.3s ease;
    white-space: nowrap;
    clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
    width: auto;
    min-height: 44px;
}

.cyber-btn.primary {
    border-color: var(--cp-blue);
    color: var(--cp-blue);
    font-size: 1.3rem;
    display: flex;
    flex: 1;
}

.btn-text {
    position: relative;
    z-index: 2;
}

.btn-glow {
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 240, 255, 0.4), transparent);
    transition: left 0.5s ease;
}

.cyber-btn.primary .btn-glow {
    background: linear-gradient(90deg, transparent, rgba(0, 168, 232, 0.4), transparent);
}

.cyber-btn:hover {
    transform: translateY(-2px);
    box-shadow:
        0 0 30px rgba(0, 240, 255, 0.5),
        inset 0 0 30px rgba(0, 240, 255, 0.1);
}

.cyber-btn.primary:hover {
    box-shadow:
        0 0 30px rgba(0, 168, 232, 0.5),
        inset 0 0 30px rgba(0, 168, 232, 0.1);
}

.cyber-btn:hover .btn-glow {
    left: 100%;
}

.cyber-btn:active {
    transform: translateY(0);
}

.cyber-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.card-set-selector {
    display: flex;
    gap: 1rem;
    flex-shrink: 0;
}

.cyber-select {
    padding: 0.75rem 1rem;
    background: var(--panel-bg);
    border: 2px solid var(--cp-cyan);
    color: var(--cp-cyan);
    font-size: 1.3rem;
    font-weight: 700;
    letter-spacing: 0.1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
    outline: none;
    width: 100%;
    min-height: 44px;
}

.cyber-select:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(0, 240, 255, 0.5);
}

.cyber-select:focus {
    box-shadow: 0 0 30px rgba(0, 240, 255, 0.7);
}

.cyber-select option {
    background: var(--dark-bg);
    color: var(--cp-cyan);
}

.settings-row {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 0.5rem;
}

.settings-row .cyber-select {
    flex: 1;
}

#language-toggle,
#audio-btn {
    margin: 0;
    flex-shrink: 0;
    min-width: 50px;
    min-height: 45px;
}

#language-toggle .lang-text {
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.05rem;
}

.cyber-icon-btn {
    background: rgba(10, 10, 20, 0.8);
    border: 1px solid var(--neon-blue);
    color: var(--neon-blue);
    padding: 0.4rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    box-shadow: 0 0 5px var(--neon-blue);
    border-radius: 8px;
    width: 36px;
    height: 36px;
    flex-shrink: 0;
}

.cyber-icon-btn:hover {
    background: rgba(0, 243, 255, 0.2);
    box-shadow: 0 0 15px var(--neon-blue);
    transform: scale(1.05);
}

.cyber-icon-btn.muted {
    border-color: var(--neon-pink);
    color: var(--neon-pink);
    box-shadow: 0 0 5px var(--neon-pink);
}

.cyber-icon-btn.muted:hover {
    background: rgba(255, 0, 255, 0.2);
    box-shadow: 0 0 15px var(--neon-pink);
}

/* ==========================================================================
   Components: Stats Panel
   ========================================================================== */
.stats-panel {
    display: flex;
    justify-content: space-around;
    gap: 0.75rem;
    background: none;
    border: none;
    box-shadow: none;
    padding: 0;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.2rem;
    padding: 0.4rem 0.6rem;
    background: var(--panel-bg);
    border: 2px solid var(--cp-magenta);
    border-radius: 6px;
    box-shadow:
        0 0 15px rgba(255, 0, 110, 0.3),
        inset 0 0 15px rgba(255, 0, 110, 0.1);
    position: relative;
    overflow: hidden;
    min-width: 70px;
    flex: 1;
}

.stat-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--cp-magenta), transparent);
    animation: scanline 3s linear infinite;
}

.stat-label {
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.05rem;
    color: var(--cp-magenta);
    text-transform: uppercase;
    opacity: 0.8;
    white-space: nowrap;
}

.stat-value {
    font-size: 1.2rem;
    font-weight: 900;
    color: var(--cp-magenta);
    text-shadow:
        0 0 10px var(--cp-magenta),
        0 0 20px var(--cp-magenta);
    white-space: nowrap;
}

/* ==========================================================================
   Components: Cards
   ========================================================================== */
.card {
    position: relative;
    width: 100%;
    height: 100%;
    cursor: pointer;
    perspective: 1000px;
    z-index: 1;
    /* Initial state for animation */
    opacity: 1;
    transform: scale(1) rotateY(0deg);
    animation: cardEntrance 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
    animation-fill-mode: both;
}

.card:hover {
    z-index: 10;
}

/* Staggered animation delays */
.card:nth-child(1) {
    animation-delay: 0.05s;
}

.card:nth-child(2) {
    animation-delay: 0.1s;
}

.card:nth-child(3) {
    animation-delay: 0.15s;
}

.card:nth-child(4) {
    animation-delay: 0.2s;
}

.card:nth-child(5) {
    animation-delay: 0.25s;
}

.card:nth-child(6) {
    animation-delay: 0.3s;
}

.card:nth-child(7) {
    animation-delay: 0.35s;
}

.card:nth-child(8) {
    animation-delay: 0.4s;
}

.card:nth-child(9) {
    animation-delay: 0.05s;
}

.card:nth-child(10) {
    animation-delay: 0.1s;
}

.card:nth-child(11) {
    animation-delay: 0.15s;
}

.card:nth-child(12) {
    animation-delay: 0.2s;
}

.card:nth-child(13) {
    animation-delay: 0.25s;
}

.card:nth-child(14) {
    animation-delay: 0.3s;
}

.card:nth-child(15) {
    animation-delay: 0.35s;
}

.card:nth-child(16) {
    animation-delay: 0.4s;
}

.card:nth-child(17) {
    animation-delay: 0.05s;
}

.card:nth-child(18) {
    animation-delay: 0.1s;
}

.card:nth-child(19) {
    animation-delay: 0.15s;
}

.card:nth-child(20) {
    animation-delay: 0.2s;
}

.card:nth-child(21) {
    animation-delay: 0.25s;
}

.card:nth-child(22) {
    animation-delay: 0.3s;
}

.card:nth-child(23) {
    animation-delay: 0.35s;
}

.card:nth-child(24) {
    animation-delay: 0.4s;
}

.card:nth-child(25) {
    animation-delay: 0.05s;
}

.card:nth-child(26) {
    animation-delay: 0.1s;
}

.card:nth-child(27) {
    animation-delay: 0.15s;
}

.card:nth-child(28) {
    animation-delay: 0.2s;
}

.card:nth-child(29) {
    animation-delay: 0.25s;
}

.card:nth-child(30) {
    animation-delay: 0.3s;
}

.card:nth-child(31) {
    animation-delay: 0.35s;
}

.card:nth-child(32) {
    animation-delay: 0.4s;
}

.card:nth-child(33) {
    animation-delay: 0.05s;
}

.card:nth-child(34) {
    animation-delay: 0.1s;
}

.card:nth-child(35) {
    animation-delay: 0.15s;
}

.card:nth-child(36) {
    animation-delay: 0.2s;
}

.card:nth-child(37) {
    animation-delay: 0.25s;
}

.card:nth-child(38) {
    animation-delay: 0.3s;
}

.card:nth-child(39) {
    animation-delay: 0.35s;
}

.card:nth-child(40) {
    animation-delay: 0.4s;
}

.card:nth-child(41) {
    animation-delay: 0.05s;
}

.card:nth-child(42) {
    animation-delay: 0.1s;
}

.card:nth-child(43) {
    animation-delay: 0.15s;
}

.card:nth-child(44) {
    animation-delay: 0.2s;
}

.card:nth-child(45) {
    animation-delay: 0.25s;
}

.card:nth-child(46) {
    animation-delay: 0.3s;
}

.card:nth-child(47) {
    animation-delay: 0.35s;
}

.card:nth-child(48) {
    animation-delay: 0.4s;
}

.card-inner {
    position: absolute;
    width: 100%;
    height: 100%;
    transition: transform 0.6s cubic-bezier(0.4, 0.0, 0.2, 1);
    transform-style: preserve-3d;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

@media (hover: hover) {
    .card:hover .card-inner {
        transform: translateY(-5px);
        box-shadow: 0 8px 12px rgba(0, 0, 0, 0.4);
    }
}

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

.card.matched .card-inner {
    transform: rotateY(180deg);
    opacity: 1;
    box-shadow: 0 0 25px var(--cp-green), 0 0 50px rgba(0, 255, 65, 0.4);
}

.card-front,
.card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    font-weight: 700;
    padding: 1rem;
}

.card-back {
    background: linear-gradient(135deg,
            var(--cp-dark-bg) 0%,
            rgba(185, 103, 255, 0.3) 100%);
    border: 3px solid var(--cp-purple);
    box-shadow:
        0 0 20px rgba(185, 103, 255, 0.6),
        inset 0 0 30px rgba(185, 103, 255, 0.2);
}

.card-back::before {
    content: '';
    font-size: 3rem;
    color: var(--cp-purple);
    text-shadow: 0 0 20px var(--cp-purple);
}

.card-front {
    background: linear-gradient(135deg, rgba(10, 14, 39, 0.95) 0%, rgba(15, 20, 50, 0.9) 100%);
    border: 3px solid var(--cp-yellow);
    transform: rotateY(180deg);
    box-shadow: 0 0 30px rgba(252, 227, 0, 0.6);
    /* Dynamic font size calculated by JavaScript based on longest text */
    font-size: var(--card-font-size, clamp(1.2rem, calc(20vw / var(--grid-cols)), 3.5rem));
}

.card-front.initial {
    color: var(--cp-yellow);
    border-color: rgba(252, 227, 0, 0.6);
    box-shadow: 0 0 30px rgba(252, 227, 0, 0.5);
}

.card-front.vowel {
    color: var(--cp-magenta);
    border-color: rgba(255, 0, 110, 0.6);
    box-shadow: 0 0 30px rgba(255, 0, 110, 0.5);
}

.card-front.diphthong {
    color: var(--cp-cyan);
    border-color: rgba(0, 240, 255, 0.6);
    box-shadow: 0 0 30px rgba(0, 240, 255, 0.6);
}

.card-front.nasal {
    color: var(--cp-yellow);
    border-color: rgba(252, 227, 0, 0.6);
    box-shadow: 0 0 30px rgba(252, 227, 0, 0.6);
}

.card-front.nasalFinal {
    color: var(--cp-magenta);
    border-color: rgba(255, 0, 110, 0.6);
    box-shadow: 0 0 30px rgba(255, 0, 110, 0.6);
}

.card-front.stopFinal {
    color: var(--cp-yellow);
    border-color: rgba(252, 227, 0, 0.6);
    box-shadow: 0 0 30px rgba(252, 227, 0, 0.6);
}

.card-front .symbol {
    text-shadow: 0 0 20px currentColor;
}

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

.card.matched .card-front {
    animation: matchPulse 0.5s ease;
    border-color: var(--cp-green);
    color: var(--cp-green);
}

/* ==========================================================================
   Components: Modal
   ========================================================================== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(2px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
    animation: fadeIn 0.3s ease;
}

.modal-content {
    background: var(--panel-bg);
    border: 3px solid var(--cp-yellow);
    border-radius: 16px;
    padding: 3rem;
    text-align: center;
    max-width: 500px;
    box-shadow:
        0 0 60px rgba(252, 227, 0, 0.6),
        inset 0 0 60px rgba(252, 227, 0, 0.1);
    animation: modalSlide 0.5s ease;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    align-items: center;
}

.modal-title {
    font-size: 3rem;
    font-weight: 900;
    color: var(--cp-yellow);
    text-shadow:
        0 0 20px var(--cp-yellow),
        0 0 40px var(--cp-yellow);
    margin-bottom: 1rem;
}

.modal-message {
    font-size: 1.3rem;
    color: var(--neon-cyan);
    margin-bottom: 2rem;
    line-height: 1.6;
}

.modal-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    width: 100%;
    margin-bottom: 1rem;
}

.modal-stat-item {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--cp-magenta);
    padding: 0.8rem;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.modal-stat-label {
    font-size: 0.8rem;
    color: var(--cp-magenta);
    text-transform: uppercase;
    letter-spacing: 0.1rem;
}

.modal-stat-value {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--cp-magenta);
    text-shadow: 0 0 10px var(--cp-magenta);
}

/* ==========================================================================
   Media Queries
   ========================================================================== */
@media(max-width: 500px) {
    .neon-title {
        font-size: 2.3rem;
    }

    .subtitle {
        font-size: 0.8rem;
    }

    .cyber-select {
        font-size: 1.0rem;
    }

    .cyber-btn.primary {
        font-size: 1.2rem;
    }
}

/* ==========================================================================
   Components: Footer
   ========================================================================== */
.main-footer {
    width: 768px;
    padding: 0.7rem;
    align-self: center;
    text-align: center;
    background: rgba(10, 10, 20, 0.8);
    border-top: 2px solid rgba(252, 227, 0, 0.5);
    backdrop-filter: blur(5px);
    margin-top: auto;
    flex-shrink: 0;
}

.main-footer p {
    margin: 0;
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: 0.1rem;
}

.main-footer a {
    color: var(--cp-cyan);
    text-decoration: none;
    transition: all 0.3s ease;
    text-shadow: 0 0 5px var(--cp-cyan);
}

.main-footer a:hover {
    color: var(--cp-yellow);
    text-shadow: 0 0 10px var(--cp-yellow);
}