/* Root Design System variables */
:root {
    --bg-glass: rgba(18, 22, 33, 0.65);
    --bg-glass-hover: rgba(26, 32, 48, 0.8);
    --border-glass: rgba(255, 255, 255, 0.08);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --color-accent: #3b82f6;
    --color-accent-light: #60a5fa;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --shadow-premium: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    --font-sans: 'Outfit', 'Noto Sans SC', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --radius-hud: 16px;
    --radius-button: 10px;
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset and base styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body, html {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: #0b0f19;
    font-family: var(--font-sans);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    user-select: none;
}

/* WebGL Canvas Container */
#canvas-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

/* Screen readers helper */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* Loading Screen */
#loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, #1e293b 0%, #0f172a 100%);
    z-index: 100;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: opacity 0.8s ease-out, visibility 0.8s ease-out;
}

#loading-screen.fade-out {
    opacity: 0;
    visibility: hidden;
}

.loader-content {
    text-align: center;
    width: 320px;
}

.loader-title {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 24px;
    letter-spacing: 2px;
    background: linear-gradient(135deg, #60a5fa 0%, #059669 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.loader-bar-container {
    width: 100%;
    height: 6px;
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 16px;
    border: 1px solid rgba(255, 255, 255, 0.03);
}

#loader-bar {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, #3b82f6, #06b6d4, #10b981);
    border-radius: 3px;
    transition: width 0.3s ease-out;
}

#loader-status {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 30px;
    font-weight: 300;
    letter-spacing: 0.5px;
}

.loader-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(255, 255, 255, 0.05);
    border-top: 3px solid var(--color-accent);
    border-radius: 50%;
    margin: 0 auto;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Glassmorphism Panels Common Styles */
.hud-panel {
    position: absolute;
    background: var(--bg-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-glass);
    box-shadow: var(--shadow-premium);
    border-radius: var(--radius-hud);
    z-index: 10;
    padding: 20px;
    transition: transform var(--transition-normal), opacity var(--transition-normal), background var(--transition-fast);
}

.hud-panel:hover {
    background: var(--bg-glass-hover);
}

/* Header Panel */
.header-panel {
    top: 20px;
    left: 20px;
    padding: 12px 24px;
    display: flex;
    align-items: center;
    gap: 24px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    font-size: 1.8rem;
    animation: bounce 3s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-4px); }
}

.logo h1 {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    line-height: 1.2;
}

.logo p {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.time-weather {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.time-weather .divider {
    color: rgba(255, 255, 255, 0.1);
}

#hud-time-display {
    color: var(--color-warning);
    background: rgba(245, 158, 11, 0.1);
    padding: 4px 10px;
    border-radius: 20px;
    border: 1px solid rgba(245, 158, 11, 0.15);
}

/* Control Panel (Right Side) */
.control-panel {
    top: 20px;
    right: 20px;
    width: 280px;
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.control-panel h2 {
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    padding-bottom: 10px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

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

.control-group h3 {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
}

/* Button layout styles */
.btn-group, .btn-group-three {
    display: flex;
    gap: 8px;
    background: rgba(0, 0, 0, 0.2);
    padding: 4px;
    border-radius: calc(var(--radius-button) + 2px);
    border: 1px solid rgba(255, 255, 255, 0.03);
}

.btn-group button, .btn-group-three button {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 8px 12px;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: var(--radius-button);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-family: var(--font-sans);
}

.btn-group button:hover, .btn-group-three button:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.04);
}

.btn-group button.active, .btn-group-three button.active {
    background: var(--color-accent);
    color: var(--text-primary);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.btn-icon {
    font-size: 0.95rem;
}

/* Audio control customized */
.audio-control {
    display: flex;
    align-items: center;
    gap: 12px;
}

#btn-mute {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--border-glass);
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    transition: all var(--transition-fast);
}

#btn-mute:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: scale(1.05);
}

#btn-mute:not(.muted) {
    background: rgba(16, 185, 129, 0.15);
    border-color: rgba(16, 185, 129, 0.3);
    color: var(--color-success);
}

.volume-slider-container {
    flex: 1;
    display: flex;
    align-items: center;
}

input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 5px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    outline: none;
    cursor: pointer;
    transition: opacity var(--transition-fast);
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-accent);
    box-shadow: 0 0 8px rgba(59, 130, 246, 0.5);
    transition: transform var(--transition-fast);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

input[type="range"]:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

input[type="range"]:disabled::-webkit-slider-thumb {
    background: var(--text-muted);
    box-shadow: none;
}

.audio-note {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-weight: 300;
}

.action-group {
    gap: 10px;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-glass);
    color: var(--text-primary);
    padding: 10px 14px;
    border-radius: var(--radius-button);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all var(--transition-fast);
    font-family: var(--font-sans);
    text-align: center;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.15);
    transform: translateY(-1px);
}

.btn-secondary:active {
    transform: translateY(0);
}

#btn-night-tour {
    background: linear-gradient(135deg, rgba(96, 165, 250, 0.1) 0%, rgba(16, 185, 129, 0.1) 100%);
    border: 1px solid rgba(96, 165, 250, 0.2);
}

#btn-night-tour:hover {
    background: linear-gradient(135deg, rgba(96, 165, 250, 0.15) 0%, rgba(16, 185, 129, 0.15) 100%);
    border-color: rgba(96, 165, 250, 0.3);
}

/* Walk Mode Instructions (Bottom Left) */
.instructions-panel {
    bottom: 20px;
    left: 20px;
    width: 340px;
    padding: 16px;
    pointer-events: none; /* Let clicks pass through to Three.js environment */
    transform: translateY(0);
}

.instructions-panel h3 {
    font-size: 0.95rem;
    margin-bottom: 10px;
    font-weight: 600;
}

.instructions-panel ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.instructions-panel li {
    font-size: 0.8rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 6px;
    line-height: 1.4;
}

.key {
    background: #1e293b;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-bottom-width: 3px;
    border-radius: 5px;
    padding: 2px 6px;
    font-size: 0.75rem;
    font-family: monospace;
    font-weight: 700;
    color: var(--text-primary);
    box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}

/* Tip Panel (Bottom Right) */
.tip-panel {
    bottom: 20px;
    right: 20px;
    padding: 12px 20px;
    max-width: 320px;
    display: flex;
    align-items: center;
    gap: 10px;
    pointer-events: none;
}

.tip-icon {
    font-size: 1.2rem;
    color: var(--color-warning);
    flex-shrink: 0;
}

#tip-text {
    font-size: 0.8rem;
    line-height: 1.4;
    color: var(--text-secondary);
}

.hidden {
    opacity: 0;
    pointer-events: none !important;
    transform: translateY(10px);
}

/* Interactive Modals System */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(7, 10, 20, 0.5);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 50;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 1;
    transition: opacity var(--transition-normal) ease;
}

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

.modal-card {
    background: var(--bg-glass-hover);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 20px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    width: 90%;
    max-width: 480px;
    padding: 28px;
    position: relative;
    transform: scale(1);
    transition: transform var(--transition-normal) cubic-bezier(0.34, 1.56, 0.64, 1);
}

.modal-overlay.hidden .modal-card {
    transform: scale(0.9);
}

.modal-close-btn {
    position: absolute;
    top: 18px;
    right: 18px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.6rem;
    cursor: pointer;
    line-height: 1;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.modal-close-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.08);
}

.modal-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.modal-emoji {
    font-size: 2.5rem;
}

.modal-header h2 {
    font-size: 1.4rem;
    font-weight: 700;
}

.modal-header p {
    font-size: 0.8rem;
    color: var(--text-secondary);
    letter-spacing: 0.5px;
}

.modal-content {
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--text-secondary);
    margin-bottom: 24px;
    max-height: 300px;
    overflow-y: auto;
    padding-right: 4px;
}

.modal-content::-webkit-scrollbar {
    width: 4px;
}

.modal-content::-webkit-scrollbar-track {
    background: transparent;
}

.modal-content::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

.modal-btn {
    padding: 10px 20px;
    border-radius: var(--radius-button);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    transition: all var(--transition-fast);
    font-family: var(--font-sans);
    border: none;
}

.modal-btn-primary {
    background: var(--color-accent);
    color: white;
}

.modal-btn-primary:hover {
    background: var(--color-accent-light);
    transform: translateY(-1px);
}

.modal-btn-text {
    background: transparent;
    color: var(--text-secondary);
}

.modal-btn-text:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

/* Custom Interactive Subcomponents in Modal */
.menu-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 10px;
}

.menu-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.04);
    padding: 10px 14px;
    border-radius: 8px;
    transition: all var(--transition-fast);
}

.menu-item:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.08);
}

.menu-item-info {
    display: flex;
    flex-direction: column;
}

.menu-item-name {
    font-weight: 500;
    color: var(--text-primary);
}

.menu-item-desc {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.menu-item-price {
    font-weight: 700;
    color: var(--color-warning);
}

.info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.info-box {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.04);
    padding: 12px;
    border-radius: 8px;
}

.info-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 4px;
    text-transform: uppercase;
}

.info-value {
    font-weight: 600;
    color: var(--text-primary);
}

.notice-board {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.notice-item {
    border-left: 3px solid var(--color-accent);
    padding: 4px 12px;
    background: rgba(59, 130, 246, 0.03);
}

.notice-title {
    font-weight: 600;
    margin-bottom: 2px;
    color: var(--text-primary);
}

.notice-time {
    font-size: 0.7rem;
    color: var(--text-muted);
}

/* Floating dynamic Notification bubbles */
#notification-container {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 99;
    display: flex;
    flex-direction: column;
    gap: 10px;
    pointer-events: none;
}

.toast {
    background: rgba(30, 41, 59, 0.85);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    padding: 10px 20px;
    border-radius: 30px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.35);
    font-size: 0.85rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
    animation: toast-in 0.35s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards,
               toast-out 0.3s cubic-bezier(0.6, -0.28, 0.735, 0.045) 2.7s forwards;
    pointer-events: auto;
}

@keyframes toast-in {
    0% { transform: translateY(-20px); opacity: 0; }
    100% { transform: translateY(0); opacity: 1; }
}

@keyframes toast-out {
    0% { transform: translateY(0); opacity: 1; }
    100% { transform: translateY(-20px); opacity: 0; }
}

/* Responsive adjustment for small screens */
@media (max-width: 768px) {
    .header-panel {
        left: 10px;
        top: 10px;
        right: 10px;
        justify-content: space-between;
        padding: 8px 16px;
        gap: 10px;
    }
    
    .control-panel {
        top: auto;
        bottom: 10px;
        right: 10px;
        left: 10px;
        width: calc(100% - 20px);
        max-height: 250px;
        overflow-y: auto;
        padding: 14px;
        gap: 10px;
        flex-direction: row;
        flex-wrap: wrap;
    }

    .control-panel h2 {
        display: none;
    }

    .control-group {
        flex: 1;
        min-width: 120px;
    }

    .action-group {
        flex-direction: row;
        width: 100%;
    }

    .action-group button {
        flex: 1;
    }

    .instructions-panel {
        bottom: 270px;
        left: 10px;
        width: calc(100% - 20px);
    }

    .tip-panel {
        display: none;
    }

    .modal-card {
        padding: 20px;
    }
}

/* RPG-style floating interaction bubble */
.prompt-bubble {
    position: absolute;
    left: 0;
    top: 0;
    transform: translate(-50%, -50%) scale(1);
    background: rgba(18, 22, 33, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 20px;
    padding: 8px 16px;
    color: var(--text-primary);
    font-size: 0.85rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.1);
    z-index: 40;
    pointer-events: auto;
    cursor: pointer;
    transition: opacity 0.25s ease, transform 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275), background var(--transition-fast);
}

.prompt-bubble:hover {
    background: rgba(30, 41, 59, 0.95);
    border-color: rgba(255, 255, 255, 0.25);
    transform: translate(-50%, -50%) scale(1.05);
}

.prompt-bubble.hidden {
    opacity: 0;
    pointer-events: none !important;
    transform: translate(-50%, -50%) scale(0.8);
}

.prompt-icon {
    font-size: 1.05rem;
    animation: prompt-pulse 1.5s infinite alternate;
}

@keyframes prompt-pulse {
    0% { transform: scale(1); }
    100% { transform: scale(1.2); }
}

.key-prompt {
    background: var(--color-accent);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-bottom: 2px solid #1d4ed8;
    border-radius: 4px;
    padding: 1px 5px;
    font-family: monospace;
    font-weight: 800;
    color: white;
    box-shadow: 0 1px 2px rgba(0,0,0,0.4);
    margin: 0 2px;
}