/* ==========================================================================
   1. BRAND VARIABLES & ORGANIC THEME
   ========================================================================== */
:root {
    --primary-color: #3D5A45;
    --primary-dark: #2A3F30;
    --secondary-color: #708A76;
    --bg-overlay: rgba(250, 248, 245, 0.96);
    --text-dark: #2C3531;
    --text-muted: #626E68;
    --card-back-bg: #8FA89B;
    --card-front-bg: #FFFFFF;
    --accent-warm: #D9A05B;
    
    --border-radius-lg: 16px;
    --border-radius-md: 10px;
    --border-radius-sm: 6px;
    
    --shadow-ambient-sm: 0 4px 20px rgba(61, 90, 69, 0.04);
    --shadow-ambient-md: 0 12px 35px rgba(61, 90, 69, 0.06);
    --shadow-ambient-lg: 0 20px 50px rgba(61, 90, 69, 0.12);
    
    --font-primary: 'Outfit', 'Noto Sans TC', system-ui, -apple-system, sans-serif;
}

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

body {
    font-family: var(--font-primary);
    background: url('./assets/bg.jpg') no-repeat center center fixed;
    background-size: cover;
    background-color: #F4F1EA;
    color: var(--text-dark);
    min-height: 100vh;
    display: block;
    padding: 40px 20px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.game-container {
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
}

.hidden {
    display: none !important;
}

/* ==========================================================================
   2. HEADER & EDITORIAL TYPOGRAPHY
   ========================================================================== */
header {
    text-align: center;
    margin-bottom: 40px;
    background: transparent;
    padding: 25px 40px;
    border-radius: 0;
    box-shadow: none;
    border: none;
}

header h1 {
    font-size: 2.6rem;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: 0.18em;
    margin-bottom: 6px;
    text-shadow: 0 2px 4px rgba(255, 255, 255, 0.8);
}

header .subtitle {
    font-size: 1rem;
    font-weight: 600;
    color: var(--secondary-color);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    opacity: 0.9;
    text-shadow: 0 1px 2px rgba(255, 255, 255, 0.8);
}

/* ==========================================================================
   3. SETTINGS PANEL
   ========================================================================== */
.card-panel {
    background: transparent;
    padding: 20px 10px;
    box-shadow: none;
    border: none;
}

.card-panel h2 {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 35px;
    letter-spacing: 0.1em;
    text-align: center;
    position: relative;
    text-shadow: 0 1px 2px rgba(255, 255, 255, 0.6);
}

.card-panel h2::after {
    content: '';
    display: block;
    width: 40px;
    height: 2px;
    background: var(--primary-color);
    margin: 12px auto 0 auto;
    opacity: 0.4;
}

.config-group {
    margin-bottom: 40px;
}

.section-label {
    display: block;
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--primary-color);
    letter-spacing: 0.05em;
    text-shadow: 0 1px 1px rgba(255, 255, 255, 0.5);
}

.radio-tile-group {
    display: flex;
    gap: 20px;
}

.radio-tile {
    flex: 1;
    position: relative;
    cursor: pointer;
}

.radio-tile input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.tile-card {
    display: flex;
    flex-direction: column;
    padding: 24px;
    background: var(--bg-overlay);
    border: 1px solid rgba(61, 90, 69, 0.12);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-ambient-sm);
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.tile-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 6px;
    letter-spacing: 0.05em;
}

.tile-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 500;
    line-height: 1.4;
}

.radio-tile:hover .tile-card {
    background: #FFFFFF;
    transform: translateY(-4px) scale(1.02);
    box-shadow: var(--shadow-ambient-md);
    border-color: var(--secondary-color);
}

.radio-tile input:checked + .tile-card {
    border-color: var(--primary-color);
    background-color: #FFFFFF;
    box-shadow: var(--shadow-ambient-md);
    position: relative;
}

.radio-tile input:checked + .tile-card::after {
    content: '';
    position: absolute;
    top: 16px;
    right: 16px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--primary-color);
}

.mode-tabs {
    display: flex;
    gap: 12px;
    background: rgba(61, 90, 69, 0.06);
    padding: 6px;
    border-radius: var(--border-radius-md);
    backdrop-filter: blur(5px);
}

.tab-btn {
    flex: 1;
    padding: 14px 20px;
    font-size: 1.05rem;
    font-weight: 700;
    background-color: transparent;
    border: none;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.tab-btn:hover {
    color: var(--primary-color);
}

.tab-btn.active {
    background-color: var(--bg-overlay);
    color: var(--primary-color);
    box-shadow: var(--shadow-ambient-sm);
}

.custom-panel {
    background: var(--bg-overlay);
    padding: 35px;
    border-radius: var(--border-radius-md);
    margin-top: 25px;
    border: 1px solid rgba(61, 90, 69, 0.08);
    box-shadow: var(--shadow-ambient-sm);
}

.custom-panel h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 6px;
    color: var(--primary-color);
    letter-spacing: 0.05em;
}

.form-help {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 25px;
}

.input-pair-row {
    display: flex;
    gap: 20px;
    align-items: center;
    margin-bottom: 18px;
    background: transparent;
    padding: 4px 0;
}

.pair-index {
    font-weight: 700;
    font-size: 1rem;
    color: var(--secondary-color);
    width: 24px;
    opacity: 0.7;
}

.input-pair-row input {
    flex: 1;
    padding: 10px 2px;
    font-size: 1.05rem;
    font-weight: 500;
    color: var(--text-dark);
    background: transparent;
    border: none;
    border-bottom: 1px solid rgba(61, 90, 69, 0.2);
    border-radius: 0;
    font-family: var(--font-primary);
    transition: all 0.3s ease;
}

.input-pair-row input:focus {
    outline: none;
    border-bottom-color: var(--primary-color);
    padding-left: 4px;
}

.primary-btn {
    display: block;
    width: 100%;
    background-color: var(--primary-color);
    color: white;
    font-size: 1.25rem;
    font-weight: 700;
    padding: 16px;
    border: none;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    box-shadow: 0 6px 20px rgba(61, 90, 69, 0.15);
    letter-spacing: 0.1em;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.primary-btn:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(61, 90, 69, 0.25);
}

.secondary-btn {
    background-color: var(--bg-overlay);
    border: 1px solid rgba(61, 90, 69, 0.2);
    color: var(--primary-color);
    font-size: 0.95rem;
    font-weight: 700;
    padding: 10px 20px;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    letter-spacing: 0.05em;
    box-shadow: var(--shadow-ambient-sm);
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.secondary-btn:hover {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-ambient-md);
}

/* ==========================================================================
   4. GAME CONTROLS & 3D BOARD
   ========================================================================== */
.game-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: transparent;
    padding: 15px 10px;
    border-radius: 0;
    margin-bottom: 25px;
    box-shadow: none;
    border: none;
}

.game-stats {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-dark);
    letter-spacing: 0.05em;
    text-shadow: 0 1px 2px rgba(255, 255, 255, 0.8);
}

.game-stats strong {
    font-size: 1.4rem;
    color: var(--primary-color);
    font-weight: 700;
    margin-left: 4px;
}

#card-grid {
    display: grid;
    gap: 20px;
    margin-bottom: 40px;
    perspective: 1200px;
}

.grid-3x3 {
    grid-template-columns: repeat(3, 1fr);
}

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

.memory-card {
    aspect-ratio: 4 / 3;
    position: relative;
    cursor: pointer;
    transform-style: preserve-3d;
    border-radius: var(--border-radius-md);
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.memory-card:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: var(--shadow-ambient-md);
}

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

.memory-card.flipped:hover,
.memory-card.matched:hover {
    transform: rotateY(180deg) translateY(-4px) scale(1.02);
}

.memory-card.matched {
    cursor: default;
    pointer-events: none;
    opacity: 0.65;
}

.card-face {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: var(--border-radius-md);
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    padding: 16px;
    border: none;
}

.card-back {
    background-color: var(--card-back-bg);
    background-image: url('./assets/card-back.png');
    background-size: cover;
    background-position: center;
    box-shadow: inset 0 0 40px rgba(61, 90, 69, 0.15);
}

.card-back::after {
    content: "❖";
    font-size: 2.2rem;
    color: rgba(255, 255, 255, 0.35);
    font-weight: 300;
}

.card-front {
    background-color: var(--card-front-bg);
    transform: rotateY(180deg);
    flex-direction: column;
    box-shadow: var(--shadow-ambient-sm);
    padding: 0;
}

.card-text {
    font-size: 1.4rem;
    font-weight: 700;
    text-align: center;
    word-break: break-word;
    color: var(--text-dark);
    line-height: 1.3;
    letter-spacing: 0.02em;
    padding: 16px;
}

.lang-indigenous {
    color: var(--primary-color);
    font-size: 1.5rem;
    font-weight: 700;
}

.lang-chinese {
    color: var(--secondary-color);
    font-size: 1.35rem;
    font-weight: 500;
}

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

.memory-card.wildcard .card-front {
    background-color: #FDF9F2;
    background-image: radial-gradient(var(--accent-warm) 0.5px, transparent 0.5px);
    background-size: 10px 10px;
}

.memory-card.wildcard .card-text {
    color: var(--accent-warm);
    font-weight: 700;
}

/* ==========================================================================
   5. MODAL & PREVIEW POPUP
   ========================================================================== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(44, 53, 49, 0.4);
    backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.modal-content {
    background: var(--bg-overlay);
    padding: 40px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-ambient-lg);
    max-width: 90%;
    max-height: 80%;
    border: 1px solid rgba(61, 90, 69, 0.1);
    animation: premiumZoomIn 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.enlarged-card-render {
    min-width: 320px;
    min-height: 240px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 10px;
}

.enlarged-card-render img {
    max-width: 400px;
    max-height: 350px;
    object-fit: contain;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-ambient-md);
}

.enlarged-card-render p {
    font-weight: 700;
    margin-top: 20px;
    line-height: 1.4;
    text-align: center;
}

.enlarged-card-render p.lang-indigenous {
    font-size: 2.8rem;
    color: var(--primary-color);
    letter-spacing: 0.05em;
}

.enlarged-card-render p.lang-chinese {
    font-size: 2.4rem;
    color: var(--secondary-color);
}

/* ==========================================================================
   6. CELEBRATION OVERLAY & CONFETTI (避免全螢幕鎖死)
   ========================================================================== */
.celebration-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    z-index: 10000;
    display: flex;
    justify-content: center;
    align-items: center;
}

.celebration-overlay {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    pointer-events: none;
}

.celebration-badge {
    background: var(--bg-overlay);
    padding: 30px 60px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-ambient-lg);
    border: 2px solid var(--primary-color);
    text-align: center;
    z-index: 10001;
    animation: bouncePopIn 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

.celebration-badge h2 {
    font-size: 3rem;
    font-weight: 900;
    color: var(--primary-color);
    letter-spacing: 0.15em;
    margin-bottom: 5px;
}

.celebration-badge .sparkles {
    font-size: 1.8rem;
    letter-spacing: 0.3em;
}

.confetti-container {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
    z-index: 10000;
}

.confetti-piece {
    position: absolute;
    width: 12px;
    height: 24px;
    background: var(--accent-warm);
    border-radius: 4px;
    opacity: 0.9;
    top: -50px;
    animation: fallAndSpin 2s linear forwards;
}

.confetti-piece:nth-child(3n+1) { background-color: #D9A05B; }
.confetti-piece:nth-child(3n+2) { background-color: #3D5A45; }
.confetti-piece:nth-child(3n+3) { background-color: #708A76; }
.confetti-piece:nth-child(4n+1) { background-color: #E5C398; }

@keyframes bouncePopIn {
    0% { transform: scale(0.6); opacity: 0; }
    70% { transform: scale(1.1); opacity: 1; }
    100% { transform: scale(1); opacity: 1; }
}

@keyframes fallAndSpin {
    0% {
        top: -20px;
        transform: translateX(0) rotate(0deg);
    }
    100% {
        top: 110%;
        transform: translateX(120px) rotate(720deg);
    }
}

.victory-content {
    background: var(--bg-overlay);
    border: 1px solid rgba(61, 90, 69, 0.1);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-ambient-lg);
    text-align: center;
    max-width: 460px;
    width: 90%;
    padding: 50px 40px;
    animation: premiumZoomIn 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.victory-content h2 {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: 0.1em;
    margin-bottom: 20px;
}

.victory-content p {
    font-size: 1.15rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.victory-stats {
    font-size: 1.3rem !important;
    color: var(--primary-color) !important;
    font-weight: 700 !important;
    margin-top: 15px;
}

#victory-close-btn {
    margin-top: 30px;
}

@keyframes premiumZoomIn {
    from { 
        transform: scale(0.95) translateY(10px); 
        opacity: 0; 
    }
    to { 
        transform: scale(1) translateY(0); 
        opacity: 1; 
    }
}

@media (max-width: 768px) {
    body { padding: 20px 12px; }
    header { padding: 20px 10px; margin-bottom: 25px; }
    header h1 { font-size: 1.8rem; letter-spacing: 0.12em; }
    .card-panel { padding: 15px 5px; }
    .radio-tile-group { flex-direction: column; gap: 12px; }
    .tile-card { padding: 16px; }
    .mode-tabs { flex-direction: column; gap: 6px; }
    .tab-btn { padding: 12px; font-size: 0.95rem; }
    .custom-panel { padding: 20px; }
    .input-pair-row { gap: 10px; flex-direction: column; align-items: flex-start; margin-bottom: 24px; }
    .input-pair-row input { width: 100%; }
    .game-controls { padding: 15px 5px; }
    #card-grid { gap: 12px; }
    .card-text { font-size: 1.1rem; }
    .lang-indigenous { font-size: 1.15rem; }
    .lang-chinese { font-size: 1.05rem; }
    .enlarged-card-render { min-width: 240px; min-height: 180px; }
    .enlarged-card-render p.lang-indigenous { font-size: 2rem; }
    .enlarged-card-render p.lang-chinese { font-size: 1.8rem; }
    .enlarged-card-render img { max-width: 260px; max-height: 240px; }
    .celebration-badge { padding: 20px 40px; }
    .celebration-badge h2 { font-size: 2.2rem; }
}