@import url('https://fonts.googleapis.com/css2?family=VT323&display=swap');

:root {
    --black: #000;
    --white: #fff;
    --gray-dark: #111;
    --gray-mid: #333;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html, body { width: 100%; height: 100%; overflow: hidden; }

.game-body {
    background: var(--black);
    color: var(--white);
    font-family: 'VT323', monospace;
    image-rendering: pixelated;
    image-rendering: crisp-edges;
}

.crt-overlay {
    position: fixed; inset: 0; z-index: 999; pointer-events: none;
}
.crt-flicker {
    position: absolute; inset: 0;
    background: rgba(255,255,255,0.012);
    animation: flicker 0.1s infinite;
}
@keyframes flicker {
    0% { opacity: 0.9; } 50% { opacity: 1; } 100% { opacity: 0.92; }
}
.vignette {
    position: absolute; inset: 0;
    background: radial-gradient(ellipse at center, transparent 45%, rgba(0,0,0,0.85) 100%);
}

.fullscreen-overlay {
    position: fixed; inset: 0;
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
}
.fullscreen-overlay.hidden { display: none; }
.fullscreen-overlay.active { display: flex; }

.starfield-canvas {
    position: absolute; inset: 0;
    width: 100%; height: 100%; z-index: -1;
}

/* MENU */
#start-screen {
    background: var(--black);
    justify-content: space-between; padding: 0;
}
.retro-nav {
    width: 100%; padding: 16px 40px;
    display: flex; justify-content: space-between;
    align-items: center;
    border-bottom: 6px solid var(--white);
    z-index: 10;
}
.back-link {
    color: var(--white); text-decoration: none;
    font-size: 1.6rem; letter-spacing: 2px;
    transition: all 0.15s;
}
.back-link:hover { background: var(--white); color: var(--black); }
.retro-badge {
    font-size: 1.2rem; letter-spacing: 3px; opacity: 0.5;
}

.menu-content {
    flex: 1; display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    gap: 14px; z-index: 10;
}
.title-block { text-align: center; line-height: 1; }
.title-sub {
    font-size: 1.1rem; letter-spacing: 6px;
    opacity: 0.7; margin-bottom: 4px;
}
.game-big-title {
    font-size: clamp(3rem, 9vw, 6rem);
    font-weight: 400; line-height: 0.95;
    text-shadow: 5px 5px 0 var(--gray-mid), -2px -2px 0 rgba(255,255,255,0.15);
    letter-spacing: 4px;
    text-align: center;
}
.title-shadow {
    display: inline-block;
    border: 6px solid var(--white);
    padding: 0 12px;
    letter-spacing: 12px;
    margin-top: 10px;
    box-shadow: 6px 6px 0 var(--gray-dark), 8px 8px 0 var(--white);
    color: var(--white);
}

.menu-instructions {
    text-align: left;
    border: 4px solid var(--white);
    padding: 10px 24px;
    font-size: 1.2rem;
    line-height: 1.7;
    letter-spacing: 1px;
    opacity: 0.85;
}

.menu-legend {
    display: flex; gap: 8px; font-size: 1rem; flex-wrap: wrap; justify-content: center;
}
.ml-badge {
    border: 3px solid var(--white);
    padding: 2px 8px;
    letter-spacing: 1px;
    font-size: 1rem;
}

.hi-score-display {
    font-size: 2rem; letter-spacing: 6px; opacity: 0.7;
}

.pixel-btn {
    background: var(--white); color: var(--black);
    border: 6px solid var(--white);
    padding: 10px 36px; font-size: 2rem;
    font-family: 'VT323', monospace; letter-spacing: 4px;
    cursor: pointer; text-decoration: none;
    display: inline-block; transition: all 0.1s;
    text-align: center;
    box-shadow: 4px 4px 0 rgba(255,255,255,0.25);
}
.pixel-btn:hover {
    background: var(--black); color: var(--white);
    box-shadow: 4px 4px 0 var(--white);
}
.pixel-btn-outline {
    background: var(--black); color: var(--white);
    box-shadow: none;
}
.pixel-btn-outline:hover {
    background: var(--white); color: var(--black);
    box-shadow: 4px 4px 0 var(--white);
}
.blink-btn { animation: btnBlink 1.2s step-start infinite; }
@keyframes btnBlink {
    0%, 49% { opacity: 1; } 50%, 100% { opacity: 0.4; }
}
.flicker-text { animation: flicker 0.4s infinite; }

.retro-footer {
    width: 100%; border-top: 6px solid var(--white);
    text-align: center; padding: 14px;
    font-size: 1rem; letter-spacing: 2px;
    opacity: 0.55; z-index: 10;
}
.footer-tape {
    display: block; font-size: 0.7rem;
    opacity: 0.2; margin-bottom: 4px; letter-spacing: 4px;
}

/* GAME SCREEN */
#game-screen { background: var(--black); justify-content: flex-start; }

.hud {
    width: 100%; display: flex; justify-content: space-between;
    align-items: center; padding: 8px 20px;
    border-bottom: 6px solid var(--white);
    background: var(--black); z-index: 10; flex-shrink: 0;
}
.hud-block { display: flex; flex-direction: column; gap: 2px; }
.hud-center { align-items: center; flex: 1; }
.hud-right { align-items: flex-end; }
.hud-label {
    font-size: 0.8rem; letter-spacing: 3px; opacity: 0.5;
}
.hud-value {
    font-size: 1.6rem; letter-spacing: 3px;
}
.hud-title {
    font-size: 1.1rem; letter-spacing: 5px; opacity: 0.4;
}
.timer-display {
    font-size: 2.2rem;
    letter-spacing: 6px;
}

/* Card Grid */
.card-grid {
    flex: 1;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(4, 1fr);
    gap: 8px;
    padding: 20px;
    max-width: 520px;
    width: 100%;
    margin: 0 auto;
    align-content: center;
}

.card {
    border: 4px solid var(--white);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    aspect-ratio: 1;
    background: var(--black);
    transition: border-color 0.15s;
}
.card:hover {
    border-color: rgba(255,255,255,0.6);
}

.card-back,
.card-front {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.card-back {
    background: repeating-linear-gradient(
        45deg,
        var(--black),
        var(--black) 4px,
        var(--white) 4px,
        var(--white) 8px
    );
}
.card-back::after {
    content: '?';
    font-size: 2.5rem;
    color: var(--white);
    text-shadow: 2px 2px 0 var(--black);
}

.card-front {
    background: var(--black);
    display: none;
    font-size: 2.5rem;
}

.card.flipped .card-back { display: none; }
.card.flipped .card-front { display: flex; }

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

.card.matched {
    opacity: 0.35;
    cursor: default;
    pointer-events: none;
}
.card.matched .card-front {
    display: flex;
}
.card.matched .card-back {
    display: none;
}

.card.limit-card .card-front {
    color: #ff4444;
    font-size: 1.5rem;
}
.card.limit-card .card-front::before {
    content: 'LIMIT';
    font-size: 0.9rem;
    letter-spacing: 4px;
}

.card.service-card .card-front {
    text-shadow: 0 0 8px currentColor;
}

/* Footer warning */
.game-footer {
    width: 100%; display: flex; justify-content: space-between;
    padding: 8px 20px; border-top: 6px solid var(--white);
    font-size: 1rem; letter-spacing: 3px;
    background: var(--black); flex-shrink: 0;
}
.limit-warning {
    color: #ff4444;
    opacity: 0;
    transition: opacity 0.2s;
}
.limit-warning.active {
    opacity: 1;
}

/* GAME OVER */
#gameover-screen { background: var(--black); }
.gameover-content {
    z-index: 10; display: flex; flex-direction: column;
    align-items: center; gap: 16px;
    border: 6px solid var(--white);
    padding: 32px 48px;
    box-shadow: 8px 8px 0 rgba(255,255,255,0.12);
}
.go-pre { font-size: 1.3rem; letter-spacing: 6px; opacity: 0.6; }
.go-title {
    font-size: clamp(3rem, 9vw, 6rem); font-weight: 400;
    text-align: center; line-height: 0.9;
    text-shadow: 5px 5px 0 var(--gray-mid);
    letter-spacing: 8px;
}
.go-scores { width: 100%; display: flex; flex-direction: column; gap: 6px; }
.go-score-row {
    display: flex; justify-content: space-between;
    font-size: 1.6rem; border-bottom: 1px solid var(--white);
    padding-bottom: 4px; letter-spacing: 4px;
}
.go-buttons { display: flex; gap: 14px; }

.new-record {
    font-size: 1.8rem; letter-spacing: 6px;
    color: var(--white);
    animation: recordPulse 0.8s infinite;
}
.new-record.hidden { display: none; }
@keyframes recordPulse {
    0%, 100% { opacity: 1; text-shadow: 0 0 10px var(--white); }
    50% { opacity: 0.5; text-shadow: 0 0 2px var(--white); }
}

@media (max-width: 600px) {
    .menu-instructions { font-size: 1rem; padding: 8px 16px; }
    .game-big-title { font-size: 2.5rem; }
    .title-shadow { letter-spacing: 6px; }
    .card-grid { gap: 5px; padding: 10px; max-width: 100%; }
    .card-back::after { font-size: 1.8rem; }
    .card-front { font-size: 1.8rem; }
    .hud { padding: 6px 12px; }
    .timer-display { font-size: 1.6rem; }
    .retro-nav { padding: 12px 20px; }
    .gameover-content { padding: 24px 30px; }
    .pixel-btn { font-size: 1.6rem; padding: 8px 24px; }
}

@media (max-width: 400px) {
    .card-grid { gap: 4px; padding: 8px; }
    .card { border-width: 3px; }
    .card-back::after { font-size: 1.4rem; }
    .card-front { font-size: 1.4rem; }
}