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

:root {
    --bg-dark: #0a0a0f;
    --bg-card: #14141f;
    --bg-surface: #1a1a2e;
    --pink: #ff2d7b;
    --pink-glow: rgba(255, 45, 123, 0.4);
    --cyan: #00e5ff;
    --cyan-glow: rgba(0, 229, 255, 0.4);
    --gold: #ffd700;
    --text: #f0f0f0;
    --text-dim: #8888aa;
    --success: #00e676;
    --radius: 12px;
    --transition: 0.3s ease;
}

body {
    font-family: 'Segoe UI', 'Hiragino Sans', 'Meiryo', sans-serif;
    background: var(--bg-dark);
    color: var(--text);
    min-height: 100vh;
    overflow-x: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* ==================== Header ==================== */
.header {
    width: 100%;
    padding: 12px 16px;
    text-align: center;
    background: linear-gradient(180deg, rgba(255,45,123,0.1), transparent);
    border-bottom: 1px solid rgba(255,45,123,0.2);
}

.title {
    font-size: 1.1rem;
    letter-spacing: 0.05em;
}

.title-brand {
    color: var(--pink);
    font-weight: 800;
    font-style: italic;
    text-shadow: 0 0 20px var(--pink-glow);
}

.title-game {
    color: var(--cyan);
    font-weight: 700;
    margin-left: 8px;
    text-shadow: 0 0 20px var(--cyan-glow);
}

.title-game-en {
    display: block;
    font-size: 0.65rem;
    color: var(--text-dim);
    font-weight: 500;
    letter-spacing: 0.08em;
    margin-top: 2px;
}

/* ==================== Bilingual Helpers ==================== */
.en-sub {
    font-size: 0.75em;
    color: var(--text-dim);
    font-weight: 400;
    opacity: 0.8;
}

.start-title-en {
    font-size: 1rem;
    color: var(--text-dim);
    font-weight: 500;
    margin-top: -16px;
}

.start-desc-en {
    font-size: 0.8rem;
    color: var(--text-dim);
    opacity: 0.7;
    margin-top: -16px;
}

.result-title-en {
    font-size: 1rem;
    color: var(--text-dim);
    font-weight: 500;
    margin-top: -12px;
}

.patreon-btn-en {
    color: var(--text-dim);
    font-size: 0.75rem;
    font-weight: 400;
}

/* ==================== Screens ==================== */
.screen {
    display: none;
    width: 100%;
    max-width: 600px;
    padding: 16px;
    flex: 1;
}

.screen.active {
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* ==================== Start Screen ==================== */
.start-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
    padding-top: 40px;
}

.logo-big {
    font-size: 80px;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.start-title {
    font-size: 2rem;
    background: linear-gradient(135deg, var(--pink), var(--cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 800;
}

.start-desc {
    color: var(--text-dim);
    font-size: 1rem;
}

/* Difficulty Selector */
.difficulty-selector {
    width: 100%;
    max-width: 400px;
}

.difficulty-label {
    display: block;
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-dim);
    margin-bottom: 12px;
}

.difficulty-buttons {
    display: flex;
    gap: 8px;
}

.diff-btn {
    flex: 1;
    background: var(--bg-surface);
    border: 2px solid transparent;
    border-radius: var(--radius);
    padding: 12px 8px;
    color: var(--text);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.diff-btn:hover {
    border-color: var(--pink);
    background: rgba(255, 45, 123, 0.1);
}

.diff-btn.active {
    border-color: var(--cyan);
    background: rgba(0, 229, 255, 0.1);
    box-shadow: 0 0 15px var(--cyan-glow);
}

.diff-icon {
    font-size: 1.2rem;
}

.diff-name {
    font-size: 1rem;
    font-weight: 700;
}

.diff-detail {
    font-size: 0.7rem;
    color: var(--text-dim);
}

/* ==================== Buttons ==================== */
.btn-primary {
    padding: 14px 40px;
    font-size: 1.1rem;
    font-weight: 700;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    background: linear-gradient(135deg, var(--pink), #ff6b9d);
    color: #fff;
    transition: var(--transition);
    letter-spacing: 0.05em;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px var(--pink-glow);
}

.btn-glow {
    animation: btnGlow 2s ease-in-out infinite alternate;
}

@keyframes btnGlow {
    from { box-shadow: 0 0 10px var(--pink-glow); }
    to { box-shadow: 0 0 30px var(--pink-glow), 0 0 60px rgba(255,45,123,0.2); }
}

.btn-secondary {
    padding: 10px 24px;
    font-size: 0.95rem;
    font-weight: 600;
    border: 2px solid var(--text-dim);
    border-radius: 50px;
    cursor: pointer;
    background: transparent;
    color: var(--text);
    transition: var(--transition);
}

.btn-secondary:hover {
    border-color: var(--cyan);
    color: var(--cyan);
    box-shadow: 0 0 15px var(--cyan-glow);
}

.btn-share {
    background: #000;
    border: 2px solid #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-share:hover {
    background: #1a1a1a;
}

/* ==================== Game Info Bar ==================== */
.game-info {
    display: flex;
    justify-content: space-around;
    width: 100%;
    padding: 12px 0;
    margin-bottom: 12px;
    background: var(--bg-surface);
    border-radius: var(--radius);
    border: 1px solid rgba(255,255,255,0.05);
}

.info-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.info-label {
    font-size: 0.75rem;
    color: var(--text-dim);
}

.info-value {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--cyan);
    font-variant-numeric: tabular-nums;
}

/* ==================== Game Board ==================== */
.game-board {
    display: grid;
    gap: 8px;
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
    perspective: 1000px;
}

.game-board.grid-3x4 {
    grid-template-columns: repeat(3, 1fr);
}

.game-board.grid-4x4 {
    grid-template-columns: repeat(4, 1fr);
}

.game-board.grid-4x5 {
    grid-template-columns: repeat(4, 1fr);
}

/* ==================== Cards ==================== */
.card {
    aspect-ratio: 3 / 4;
    cursor: pointer;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.5s ease;
}

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

.card.matched {
    transform: rotateY(180deg);
}

.card.matched .card-front {
    box-shadow: 0 0 20px var(--success), 0 0 40px rgba(0,230,118,0.3);
    border-color: var(--success);
}

.card-face {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    border-radius: var(--radius);
    overflow: hidden;
    border: 2px solid rgba(255,255,255,0.1);
}

/* Card Back */
.card-back {
    background: linear-gradient(135deg, var(--bg-surface), #1f1f3a);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 6px;
    position: relative;
    overflow: hidden;
}

.card-back::before {
    content: '';
    position: absolute;
    inset: 4px;
    border: 2px solid rgba(255,45,123,0.3);
    border-radius: 8px;
    pointer-events: none;
}

.card-back::after {
    content: '';
    position: absolute;
    inset: 0;
    background: repeating-linear-gradient(
        45deg,
        transparent,
        transparent 8px,
        rgba(255,45,123,0.05) 8px,
        rgba(255,45,123,0.05) 16px
    );
    pointer-events: none;
}

.card-back-icon {
    font-size: 2rem;
    z-index: 1;
    filter: drop-shadow(0 0 8px var(--pink-glow));
}

.card-back-text {
    font-size: 0.5rem;
    font-weight: 800;
    font-style: italic;
    color: var(--pink);
    letter-spacing: 0.1em;
    z-index: 1;
    text-shadow: 0 0 10px var(--pink-glow);
}

/* Card Front */
.card-front {
    transform: rotateY(180deg);
    background: var(--bg-card);
}

.card-front img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* Card hover effect */
.card:not(.flipped):not(.matched):hover {
    transform: scale(1.03);
}

.card:not(.flipped):not(.matched):hover .card-back {
    border-color: var(--pink);
    box-shadow: 0 0 15px var(--pink-glow);
}

/* Match animation */
@keyframes matchPop {
    0% { transform: rotateY(180deg) scale(1); }
    50% { transform: rotateY(180deg) scale(1.1); }
    100% { transform: rotateY(180deg) scale(1); }
}

.card.match-anim {
    animation: matchPop 0.4s ease;
}

/* Mismatch shake */
@keyframes shake {
    0%, 100% { transform: rotateY(180deg) translateX(0); }
    25% { transform: rotateY(180deg) translateX(-5px); }
    75% { transform: rotateY(180deg) translateX(5px); }
}

.card.mismatch-anim {
    animation: shake 0.4s ease;
}

/* ==================== Result Screen ==================== */
.result-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    padding-top: 30px;
    text-align: center;
}

.result-badge {
    font-size: 1rem;
    font-weight: 800;
    padding: 6px 24px;
    border-radius: 50px;
    background: linear-gradient(135deg, var(--pink), var(--cyan));
    color: #fff;
    letter-spacing: 0.1em;
    animation: pulse 1.5s ease-in-out infinite;
}

.result-title {
    font-size: 1.8rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--gold), #ffaa00);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.star-rating {
    font-size: 3rem;
    letter-spacing: 8px;
    filter: drop-shadow(0 0 10px rgba(255,215,0,0.5));
}

.star-dim {
    opacity: 0.2;
}

.result-stats {
    display: flex;
    gap: 30px;
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    background: var(--bg-surface);
    padding: 16px 24px;
    border-radius: var(--radius);
    border: 1px solid rgba(255,255,255,0.05);
    min-width: 120px;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-dim);
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--cyan);
}

.result-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
    width: 100%;
    max-width: 300px;
}

.result-actions .btn-primary,
.result-actions .btn-secondary {
    width: 100%;
}

/* ==================== Patreon CTA ==================== */
.patreon-cta {
    width: 100%;
    padding: 16px;
    margin-top: auto;
}

.patreon-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    padding: 16px;
    background: linear-gradient(135deg, rgba(255,45,123,0.1), rgba(0,229,255,0.1));
    border: 1px solid rgba(255,45,123,0.3);
    border-radius: var(--radius);
    transition: var(--transition);
    max-width: 600px;
    margin: 0 auto;
}

.patreon-link:hover {
    border-color: var(--pink);
    box-shadow: 0 0 20px var(--pink-glow);
    transform: translateY(-2px);
}

.patreon-text {
    color: var(--text);
    font-size: 0.9rem;
}

.patreon-btn {
    color: var(--pink);
    font-weight: 700;
    font-size: 1rem;
    text-shadow: 0 0 10px var(--pink-glow);
}

/* ==================== Retry button in game ==================== */
#retryBtn {
    margin-top: 16px;
    align-self: center;
}

/* ==================== Responsive ==================== */
@media (max-width: 480px) {
    .game-board {
        gap: 6px;
    }

    .card-back-icon {
        font-size: 1.5rem;
    }

    .card-back-text {
        font-size: 0.4rem;
    }

    .info-value {
        font-size: 1rem;
    }

    .result-stats {
        gap: 16px;
    }

    .stat {
        padding: 12px 16px;
        min-width: 100px;
    }
}

@media (max-width: 360px) {
    .game-board {
        gap: 4px;
    }

    .difficulty-buttons {
        flex-direction: column;
    }

    .diff-btn {
        flex-direction: row;
        justify-content: center;
        gap: 12px;
        padding: 10px;
    }
}

/* ==================== Confetti / Celebration ==================== */
.confetti-container {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 100;
    overflow: hidden;
}

.confetti {
    position: absolute;
    width: 10px;
    height: 10px;
    top: -10px;
    animation: confettiFall linear forwards;
}

@keyframes confettiFall {
    to {
        top: 110vh;
        transform: rotate(720deg);
    }
}