/* ==========================================
   PAPERFOLD ODYSSEY (纸境折跃) - STYLE
   ========================================== */

/* Design Tokens & CSS Variables */
:root {
    --bg-paper: #f4efe2;       /* Warm handmade paper base */
    --bg-card: #fdfaf2;        /* Pure white paper layer */
    --text-primary: #3d352a;   /* Sumi ink charcoal black */
    --text-secondary: #706351; /* Charcoal gray-brown */
    --border-color: #e5dec9;   /* Delicate crease/paper border */
    
    /* Soft Pastel Washi Colors */
    --washi-red: #c84b31;      /* Vermillion/Crimson */
    --washi-blue: #3d7ea6;     /* Indigo/Sky blue */
    --washi-green: #598f6d;    /* Jade/Sage green */
    --washi-yellow: #d19f37;   /* Mustard yellow */
    --washi-ink: #2b2b2b;      /* Calligraphy Ink */
    
    /* Shadows & Depths (Embossed/Debossed paper) */
    --paper-shadow-sm: 0 2px 4px rgba(61, 53, 42, 0.06);
    --paper-shadow-md: 0 6px 16px rgba(61, 53, 42, 0.08);
    --paper-shadow-lg: 0 12px 28px rgba(61, 53, 42, 0.12);
    --paper-inset-shadow: inset 1px 1px 3px rgba(61, 53, 42, 0.06), inset -1px -1px 3px rgba(255, 255, 255, 0.8);
    --paper-flat-shadow: 1px 1px 2px rgba(61, 53, 42, 0.15);
    
    --font-ui: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-title: 'Outfit', 'Noto Serif SC', serif;
}

/* Reset & Base Styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: var(--font-ui);
    background-color: var(--bg-paper);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
    line-height: 1.5;
}

/* 1. Paper Backdrop Texture */
.paper-bg-wrapper {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -10;
    pointer-events: none;
    background-color: var(--bg-paper);
}

/* CSS-based procedural Washi paper fiber texture */
.paper-texture {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.07;
    background-image: 
        radial-gradient(circle at 30% 20%, rgba(61, 53, 42, 0.1) 1px, transparent 1px),
        radial-gradient(circle at 75% 60%, rgba(61, 53, 42, 0.08) 2px, transparent 2px),
        linear-gradient(45deg, rgba(61,53,42,0.03) 25%, transparent 25%, transparent 75%, rgba(61,53,42,0.03) 75%, rgba(61,53,42,0.03)),
        linear-gradient(45deg, rgba(61,53,42,0.03) 25%, var(--bg-paper) 25%, var(--bg-paper) 75%, rgba(61,53,42,0.03) 75%, rgba(61,53,42,0.03));
    background-size: 120px 120px, 150px 150px, 40px 40px, 40px 40px;
}

.paper-gradient-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, transparent 40%, rgba(61, 53, 42, 0.06) 100%);
}

.background-creases {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(135deg, transparent 49.5%, rgba(61, 53, 42, 0.04) 50%, transparent 50.5%),
        linear-gradient(45deg, transparent 49.5%, rgba(61, 53, 42, 0.04) 50%, transparent 50.5%);
    background-size: 200px 200px;
    opacity: 0.5;
}

/* 2. Layout Structure */
.game-wrapper {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
.game-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px dashed var(--border-color);
}

.back-link .btn-back {
    display: inline-flex;
    align-items: center;
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    padding: 8px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--paper-shadow-sm);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.back-link .btn-back:hover {
    transform: translateY(-1px);
    box-shadow: var(--paper-shadow-md);
    color: var(--washi-red);
    border-color: var(--washi-red);
}

.back-arrow {
    margin-right: 6px;
    transition: transform 0.2s ease;
}

.back-link .btn-back:hover .back-arrow {
    transform: translateX(-3px);
}

.game-title-group {
    text-align: center;
}

.paper-title {
    font-family: var(--font-title);
    font-weight: 700;
    font-size: 1.8rem;
    letter-spacing: 2px;
    color: var(--text-primary);
}

.sub-title {
    font-size: 0.85rem;
    color: var(--text-secondary);
    letter-spacing: 1px;
}

.paper-badge {
    background: var(--washi-red);
    color: #fff;
    font-family: var(--font-title);
    font-weight: 600;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.9rem;
    box-shadow: var(--paper-flat-shadow);
}

/* Main Layout Grid */
.game-layout {
    display: grid;
    grid-template-columns: 280px 1fr 280px;
    gap: 20px;
    align-items: start;
    flex-grow: 1;
}

/* Cards Design (Layered Papercraft look) */
.paper-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    box-shadow: var(--paper-shadow-md);
    margin-bottom: 20px;
    position: relative;
    overflow: hidden;
}

.paper-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: repeating-linear-gradient(90deg, var(--washi-red) 0px, var(--washi-red) 15px, var(--washi-blue) 15px, var(--washi-blue) 30px, var(--washi-green) 30px, var(--washi-green) 45px);
}

.card-title {
    font-family: var(--font-title);
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 6px;
}

/* 3. Panel Left Styles */
.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 16px;
}

.stat-box {
    background: rgba(61, 53, 42, 0.03);
    border: 1px dashed var(--border-color);
    border-radius: 8px;
    padding: 10px 8px;
    text-align: center;
}

.stat-title {
    font-size: 0.75rem;
    color: var(--text-secondary);
    display: block;
    margin-bottom: 4px;
}

.stat-number {
    font-family: var(--font-title);
    font-size: 1.4rem;
    font-weight: 700;
}

.color-paper-red { color: var(--washi-red); }
.color-paper-blue { color: var(--washi-blue); }

.stat-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 10px;
    font-size: 0.9rem;
}

.stat-label {
    color: var(--text-secondary);
    font-weight: 500;
}

.stat-value {
    font-weight: 600;
}

.form-indicator {
    margin-top: 15px;
    margin-bottom: 4px;
}

.form-text-normal { color: var(--text-primary); }
.form-text-crane { color: var(--washi-blue); }
.form-text-frog { color: var(--washi-green); }
.form-text-boat { color: var(--washi-yellow); }

.form-duration-bar {
    width: 100%;
    height: 4px;
    background: rgba(61, 53, 42, 0.05);
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: 15px;
}

.form-duration-fill {
    height: 100%;
    background: var(--washi-blue);
    width: 0%;
    transition: width 0.1s linear;
}

/* Progress bar for Fold Energy */
.progress-bar {
    width: 100%;
    height: 10px;
    background: rgba(61, 53, 42, 0.05);
    border-radius: 5px;
    overflow: hidden;
    box-shadow: var(--paper-inset-shadow);
    margin-top: 6px;
    margin-bottom: 8px;
    border: 1px solid var(--border-color);
}

.progress-fill {
    height: 100%;
    width: 0%;
    border-radius: 4px;
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.color-bg-red {
    background: linear-gradient(90deg, var(--washi-blue) 0%, var(--washi-red) 100%);
}

.fold-status-text {
    font-size: 0.75rem;
    text-align: right;
    color: var(--text-secondary);
    font-style: italic;
}

/* Config UI elements */
.control-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
    font-size: 0.9rem;
}

.custom-select {
    font-family: var(--font-ui);
    padding: 6px 12px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-card);
    color: var(--text-primary);
    cursor: pointer;
    outline: none;
    box-shadow: var(--paper-shadow-sm);
}

.custom-select:focus {
    border-color: var(--washi-red);
}

/* Sound toggle switch */
.toggle-container {
    position: relative;
    width: 44px;
    height: 24px;
}

.toggle-container input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: rgba(61, 53, 42, 0.15);
    border-radius: 12px;
    transition: .3s;
    border: 1px solid var(--border-color);
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 16px;
    width: 16px;
    left: 3px;
    bottom: 3px;
    background-color: var(--bg-card);
    border-radius: 50%;
    box-shadow: var(--paper-flat-shadow);
    transition: .3s;
}

input:checked + .toggle-slider {
    background-color: var(--washi-green);
}

input:checked + .toggle-slider:before {
    transform: translateX(20px);
}

.hud-action-info {
    font-size: 0.8rem;
    background: #fdfcf7;
    border-left: 3px solid var(--washi-blue);
    padding: 10px;
    border-radius: 0 6px 6px 0;
    margin-top: 15px;
    line-height: 1.4;
    color: var(--text-secondary);
}

/* 4. Center Panel (Play Area) */
.panel-center {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.canvas-container {
    position: relative;
    background: #fffdf9;
    border: 8px solid var(--bg-card);
    border-radius: 16px;
    box-shadow: var(--paper-shadow-lg), 0 0 0 1px var(--border-color);
    width: 600px;
    height: 600px;
    overflow: hidden;
}

/* Canvas element styling */
#game-canvas {
    display: block;
    width: 100%;
    height: 100%;
    background-color: transparent;
    cursor: crosshair;
    transition: transform 0.3s ease;
}

/* Screen overlays */
.screen-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(247, 244, 237, 0.95);
    backdrop-filter: blur(2px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    padding: 30px;
    box-sizing: border-box;
    transition: opacity 0.3s ease;
    overflow-y: auto;
}

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

.overlay-content {
    text-align: center;
    max-width: 480px;
    width: 100%;
    animation: foldIn 0.5s cubic-bezier(0.18, 0.89, 0.32, 1.28);
}

@keyframes foldIn {
    0% {
        transform: perspective(600px) rotateX(-20deg) scale(0.9);
        opacity: 0;
    }
    100% {
        transform: perspective(600px) rotateX(0) scale(1);
        opacity: 1;
    }
}

.overlay-icon {
    font-size: 3.5rem;
    margin-bottom: 12px;
    filter: drop-shadow(0 4px 6px rgba(0,0,0,0.1));
}

.overlay-title {
    font-family: var(--font-title);
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--text-primary);
    letter-spacing: 2px;
}

.overlay-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 25px;
    line-height: 1.6;
    text-align: left;
    background: rgba(61, 53, 42, 0.02);
    border: 1px dashed var(--border-color);
    padding: 15px;
    border-radius: 8px;
}

.overlay-desc strong {
    color: var(--text-primary);
}

.text-crane { color: var(--washi-blue); font-weight: 600; }
.text-frog { color: var(--washi-green); font-weight: 600; }
.text-boat { color: var(--washi-yellow); font-weight: 600; }

.btn-action {
    font-family: var(--font-title);
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: 1px;
    color: #fff;
    background: var(--washi-red);
    border: none;
    border-radius: 12px;
    padding: 12px 32px;
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(200, 75, 49, 0.3), var(--paper-flat-shadow);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-action:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(200, 75, 49, 0.4), var(--paper-flat-shadow);
    background: #d45137;
}

.btn-action:active {
    transform: translateY(0);
    box-shadow: 0 2px 5px rgba(200, 75, 49, 0.3);
}

.score-summary {
    background: #fdfbf7;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px;
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.score-summary p {
    margin-bottom: 6px;
}

.score-summary p:last-child {
    margin-bottom: 0;
}

/* 5. Mobile Controls */
.mobile-controls {
    width: 100%;
    max-width: 600px;
    margin-top: 15px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 12px;
    box-shadow: var(--paper-shadow-sm);
    display: none; /* Shown dynamically on touch devices */
}

.touch-control-hint {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 8px;
    font-style: italic;
}

.mobile-hud-actions {
    display: flex;
    justify-content: space-around;
    align-items: center;
}

/* Virtual Direction Keypad */
.virtual-keypad {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.keypad-middle {
    display: flex;
    gap: 20px;
}

.keypad-btn {
    width: 48px;
    height: 48px;
    font-size: 1.2rem;
    color: var(--text-primary);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    box-shadow: var(--paper-shadow-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    user-select: none;
    transition: background 0.1s, transform 0.1s;
}

.keypad-btn:active {
    background: var(--border-color);
    transform: scale(0.95);
}

.action-buttons-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.action-btn {
    font-family: var(--font-ui);
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-primary);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px 14px;
    cursor: pointer;
    box-shadow: var(--paper-shadow-sm);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s;
    user-select: none;
}

.action-btn:active:not(:disabled) {
    transform: scale(0.97);
}

.action-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.action-btn.color-btn-red {
    border-color: rgba(200, 75, 49, 0.4);
}

.action-btn.color-btn-red:not(:disabled) {
    background: rgba(200, 75, 49, 0.05);
    color: var(--washi-red);
    border-color: var(--washi-red);
}

.action-btn.color-btn-red:not(:disabled):hover {
    background: var(--washi-red);
    color: white;
}

/* 6. Right Panel: Codex */
.codex-card {
    max-height: calc(100vh - 120px);
    overflow-y: auto;
}

.codex-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.codex-item {
    border-bottom: 1px dashed var(--border-color);
    padding-bottom: 10px;
}

.codex-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.codex-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 4px;
}

.codex-dot {
    width: 10px;
    height: 10px;
    border-radius: 2px;
    box-shadow: var(--paper-flat-shadow);
}

.color-scraps { background: repeating-linear-gradient(45deg, var(--washi-red), var(--washi-blue) 4px); }
.color-crane { background: var(--washi-blue); }
.color-frog { background: var(--washi-green); }
.color-boat { background: var(--washi-yellow); }
.color-ink { background: var(--washi-ink); border-radius: 50%; }
.color-wall { background: #b0a896; border: 1px solid var(--border-color); }

.codex-name {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-primary);
}

.codex-desc {
    font-size: 0.75rem;
    color: var(--text-secondary);
    line-height: 1.35;
}

/* 7. Responsive Styles */
@media (max-width: 1200px) {
    .game-layout {
        grid-template-columns: 260px 1fr;
        gap: 15px;
    }
    .panel-right {
        grid-column: 1 / -1;
        width: 100%;
    }
    .codex-card {
        max-height: none;
    }
    .codex-list {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 12px;
    }
}

@media (max-width: 900px) {
    .game-layout {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    .panel-left, .panel-right {
        grid-column: 1;
        width: 100%;
    }
    .codex-list {
        grid-template-columns: 1fr;
    }
    .canvas-container {
        width: 100%;
        height: auto;
        aspect-ratio: 1 / 1;
        max-width: 500px;
    }
}

@media (max-width: 500px) {
    .game-header {
        flex-direction: column;
        gap: 10px;
        align-items: center;
        text-align: center;
    }
    .back-link {
        align-self: flex-start;
    }
    .paper-badge {
        align-self: flex-end;
    }
    .game-wrapper {
        padding: 10px;
    }
    .canvas-container {
        border-width: 4px;
        border-radius: 8px;
    }
    .mobile-controls {
        display: block;
    }
}

/* Custom Scrollbar for Paper look */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: rgba(61, 53, 42, 0.02);
}
::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}