/* ==========================================
   기억력 카드 뒤집기 - Style Sheet
   ========================================== */

:root {
    --primary: #6C5CE7;
    --primary-light: #A29BFE;
    --primary-dark: #4834D4;
    --success: #00B894;
    --success-dark: #00856e;
    --warning: #FDCB6E;
    --danger: #FF7675;
    --card-back-1: #38B2F7;
    --card-back-2: #36D1C4;
    --bg-1: #E4E0FF;
    --bg-2: #F0EDFF;
    --text-dark: #2d3436;
    --text-mid: #636e72;
    --text-light: #b2bec3;
    --radius-card: 16px;
    --shadow-card: 0 8px 24px rgba(108, 92, 231, 0.2);
    --shadow-card-hover: 0 12px 32px rgba(108, 92, 231, 0.35);
}

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

body {
    font-family: 'Noto Sans KR', sans-serif;
    background: linear-gradient(135deg, var(--bg-1) 0%, var(--bg-2) 100%);
    color: var(--text-dark);
    height: 100dvh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

#app {
    flex: 1;
    min-height: 0;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

h1,
h2,
h3,
.label,
.value,
.btn {
    font-family: 'Jua', 'Noto Sans KR', sans-serif;
}

/* ==========================================
   Layout
   ========================================== */
.game-container {
    max-width: 1100px;
    width: 100%;
    margin: 0 auto;
    padding: 0.5rem 0.75rem;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0.5rem;
    flex: 1;
    min-height: 0;
}

/* ==========================================
   Slim HUD
   ========================================== */
.game-hud {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: 0.75rem;
    background: white;
    padding: 0.5rem 0.9rem;
    padding-left: 6rem; /* back-pill 공간 */
    border-radius: 14px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    flex-shrink: 0;
}
.hud-level {
    grid-column: 1;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    min-width: 0;
}
.hud-stats {
    grid-column: 2;
    justify-self: center;
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: nowrap;
}
.hud-stat {
    display: inline-flex;
    align-items: baseline;
    gap: 0.3rem;
    white-space: nowrap;
}
.hud-stat .hud-label {
    font-size: 0.95rem;
}
.hud-stat strong {
    font-family: 'Jua', sans-serif;
    font-size: 1.2rem;
    color: var(--primary);
    font-weight: 400;
}
.hud-label {
    font-family: 'Jua', sans-serif;
    font-size: 0.95rem;
    color: var(--text-dark);
    white-space: nowrap;
}
.hud-btn {
    grid-column: 3;
    justify-self: end;
    border: none;
    background: var(--primary);
    color: white;
    width: 36px;
    height: 36px;
    border-radius: 10px;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.15s, transform 0.1s;
}
.hud-btn:hover { background: var(--primary-dark); }
.hud-btn:active { transform: scale(0.94); }

.level-tiles {
    display: flex;
    gap: 0.25rem;
    flex-wrap: nowrap;
    overflow-x: auto;
    scrollbar-width: none;
}
.level-tiles::-webkit-scrollbar { display: none; }

.level-tile {
    width: 22px;
    height: 22px;
    flex-shrink: 0;
    border-radius: 6px;
    background: var(--text-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Jua', sans-serif;
    font-size: 0.7rem;
    color: white;
    font-weight: 700;
    transition: all 0.3s ease;
}

.level-tile.active {
    background: var(--card-back-1);
    box-shadow: 0 2px 8px rgba(56, 178, 247, 0.5);
    transform: scale(1.15);
}

.level-tile.done {
    background: var(--success);
}

@media (max-width: 600px) {
    .game-hud {
        padding-left: 5.5rem;
        gap: 0.5rem;
    }
    .hud-stats { gap: 0.65rem; }
    .hud-stat strong { font-size: 1rem; }
    .hud-stat .hud-label { font-size: 0.85rem; }
    .hud-level .hud-label { font-size: 0.85rem; }
    .level-tile { width: 18px; height: 18px; font-size: 0.65rem; }
}

/* ==========================================
   Game Board
   ========================================== */
.game-board-container {
    flex: 1;
    min-height: 0;
    width: 100%;
    /* perspective on PARENT enables 3D children */
    perspective: 1200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.game-board {
    display: grid;
    /* grid-template-columns, rows, gap set by JS */
}

/* ==========================================
   Card Core Styles  (3D Flip)
   ==========================================
   KEY: perspective must be on .game-board-container
        transform-style: preserve-3d on .card
        backface-visibility: hidden on .card-face elements
        .card-front starts rotated 180deg (hidden initially)
        When .flipped is added → card rotates 180deg → front becomes visible
*/
.card {
    position: relative;
    cursor: pointer;
    transform-style: preserve-3d;
    transition: transform 0.55s cubic-bezier(0.4, 0.0, 0.2, 1);
    user-select: none;
}

.card:not(.flipped):not(.matched):hover {
    transform: translateY(-4px) scale(1.03);
}

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

.card.matched {
    transform: rotateY(180deg);
    cursor: default;
    animation: matchPulse 0.4s ease forwards;
}

@keyframes matchPulse {
    0% {
        transform: rotateY(180deg) scale(1);
    }

    50% {
        transform: rotateY(180deg) scale(1.12);
    }

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

/* Card Faces - BOTH use backface-visibility:hidden */
.card-face {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    border-radius: var(--radius-card);
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: var(--shadow-card);
    font-size: calc(var(--card-size, 80px) * 0.42);
}

/* Back face - shown by default (rotated 0deg) */
.card-back {
    background: linear-gradient(135deg, var(--card-back-1), var(--card-back-2));
    color: white;
    transform: rotateY(0deg);
    transition: box-shadow 0.3s;
}

.card-back::after {
    content: '?';
    font-family: 'Jua', sans-serif;
    font-size: calc(var(--card-size, 80px) * 0.35);
    opacity: 0.85;
}

.card:not(.flipped):not(.matched):hover .card-back {
    box-shadow: var(--shadow-card-hover);
}

/* Front face - rotated 180deg so it's hidden initially */
.card-front {
    background: white;
    transform: rotateY(180deg);
    border: 3px solid rgba(108, 92, 231, 0.1);
}

/* Matched state - green front */
.card.matched .card-front {
    background: linear-gradient(135deg, #e8fff7, #c8f7e4);
    border-color: var(--success);
    box-shadow: 0 0 18px rgba(0, 184, 148, 0.4);
}

/* ==========================================
   Shake animation (mismatch) - ONLY on the
   wrapper, NOT on the inner faces, so we
   don't break the rotateY transform
   ========================================== */
.card.shake {
    animation: shakeCard 0.55s ease;
}

@keyframes shakeCard {

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

    20% {
        transform: rotateY(180deg) translateX(-7px);
    }

    40% {
        transform: rotateY(180deg) translateX(7px);
    }

    60% {
        transform: rotateY(180deg) translateX(-5px);
    }

    80% {
        transform: rotateY(180deg) translateX(5px);
    }
}

/* Pop in animation */
@keyframes popIn {
    0% {
        transform: scale(0) rotateY(0deg);
        opacity: 0;
    }

    70% {
        transform: scale(1.1) rotateY(0deg);
        opacity: 1;
    }

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

/* ==========================================
   Buttons
   ========================================== */
.controls {
    display: flex;
    gap: 1rem;
}

.btn {
    padding: 0.75rem 2rem;
    border: none;
    border-radius: 999px;
    font-size: 1rem;
    font-family: 'Jua', 'Noto Sans KR', sans-serif;
    cursor: pointer;
    transition: all 0.2s;
    letter-spacing: 0.02em;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white;
    box-shadow: 0 4px 14px rgba(108, 92, 231, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(108, 92, 231, 0.5);
}

.btn-secondary {
    background: white;
    color: var(--primary);
    border: 2px solid var(--primary-light);
    box-shadow: 0 4px 10px rgba(108, 92, 231, 0.1);
}

.btn-secondary:hover {
    background: var(--bg-2);
    transform: translateY(-2px);
}

.btn-success {
    background: linear-gradient(135deg, var(--success), #55efc4);
    color: white;
    box-shadow: 0 4px 14px rgba(0, 184, 148, 0.4);
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 184, 148, 0.5);
}

.btn:active {
    transform: translateY(0) scale(0.97);
}

/* ==========================================
   Success Modal
   ========================================== */
.modal {
    position: fixed;
    inset: 0;
    background: rgba(30, 20, 60, 0.55);
    backdrop-filter: blur(6px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    transition: opacity 0.35s;
}

.modal.hidden {
    opacity: 0;
    pointer-events: none;
}

.modal-content {
    background: white;
    padding: 2.5rem 3rem;
    border-radius: 2rem;
    text-align: center;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.2);
    max-width: 420px;
    width: 90%;
    transform: scale(1);
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    animation: modalPop 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

@keyframes modalPop {
    0% {
        transform: scale(0.7);
        opacity: 0;
    }

    100% {
        transform: scale(1);
        opacity: 1;
    }
}

.modal.hidden .modal-content {
    transform: scale(0.85);
}

.modal-emoji {
    font-size: 4rem;
    margin-bottom: 0.5rem;
    animation: bounceEmoji 0.8s ease infinite alternate;
}

@keyframes bounceEmoji {
    from {
        transform: translateY(0);
    }

    to {
        transform: translateY(-10px);
    }
}

.modal-content h2 {
    font-size: 2rem;
    color: var(--primary);
    margin-bottom: 0.4rem;
}

.modal-content p {
    font-size: 1.1rem;
    color: var(--text-mid);
    margin-bottom: 1.5rem;
}

.final-stats {
    background: var(--bg-2);
    padding: 1rem 1.5rem;
    border-radius: 1rem;
    margin-bottom: 1.5rem;
    display: flex;
    gap: 1.5rem;
    justify-content: center;
}

.final-stats p {
    font-size: 0.95rem;
    color: var(--text-mid);
    margin-bottom: 0;
}

.final-stats span {
    color: var(--primary);
    font-family: 'Jua', sans-serif;
    font-size: 1.3rem;
}

.modal-buttons {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* ==========================================
   Confetti
   ========================================== */
#confetti-container {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 999;
    overflow: hidden;
}

.confetti-piece {
    position: absolute;
    top: -20px;
    width: 10px;
    height: 10px;
    border-radius: 2px;
    opacity: 0;
    animation: confettiFall linear forwards;
}

@keyframes confettiFall {
    0% {
        transform: translateY(0) rotate(0deg);
        opacity: 1;
    }

    100% {
        transform: translateY(105vh) rotate(720deg);
        opacity: 0.3;
    }
}

/* ==========================================
   Responsive
   ========================================== */
@media (max-width: 480px) {
    .card-face {
        border-radius: 10px;
    }

    .stats-board {
        gap: 1rem;
        padding: 0.6rem 1rem;
    }

    .stat-box .value {
        font-size: 1.4rem;
    }

    .modal-content {
        padding: 2rem 1.5rem;
    }

    .final-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
}