/* ========================================
   Gallery CSS Variables (mirrors main site)
   ======================================== */
:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --accent: #06b6d4;
    --accent-light: #22d3ee;
    --secondary: #0f172a;
    --bg-dark: #0f172a;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-light: #94a3b8;
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: 'Space Grotesk', sans-serif;
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
}

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

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: #f5f0e8;
    font-family: var(--font-primary);
    -webkit-font-smoothing: antialiased;
    touch-action: none;
}

.hidden { display: none !important; }

/* ========================================
   Canvas
   ======================================== */
#gallery-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: block;
}

/* ========================================
   Loading Screen
   ======================================== */
#loading-screen {
    position: fixed;
    inset: 0;
    z-index: 1000;
    background: #f5f0e8;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.8s ease;
}

#loading-screen.fade-out {
    opacity: 0;
    pointer-events: none;
}

.loading-content {
    text-align: center;
    color: var(--text-primary);
}

.loading-spinner {
    width: 48px;
    height: 48px;
    margin: 0 auto 1.5rem;
    border: 3px solid rgba(37, 99, 235, 0.15);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-content h2 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.loading-status {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* ========================================
   Entry Overlay
   ======================================== */
#entry-overlay {
    position: fixed;
    inset: 0;
    z-index: 900;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(245, 240, 232, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.entry-content {
    text-align: center;
    max-width: 500px;
    padding: 2rem;
}

.entry-badge {
    display: inline-block;
    padding: 0.35rem 1rem;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(6, 182, 212, 0.1));
    border: 1px solid rgba(37, 99, 235, 0.2);
    border-radius: 50px;
    color: var(--primary);
    font-family: var(--font-display);
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    margin-bottom: 1.5rem;
}

.entry-content h1 {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.entry-description {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.6;
    margin-bottom: 2rem;
}

.entry-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
    margin-bottom: 2rem;
}

.control-item {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.control-item kbd {
    display: inline-block;
    padding: 0.2rem 0.5rem;
    background: rgba(37, 99, 235, 0.08);
    border: 1px solid rgba(37, 99, 235, 0.15);
    border-radius: 4px;
    font-family: var(--font-display);
    font-size: 0.75rem;
    color: var(--primary);
}

#enter-btn {
    display: inline-block;
    padding: 0.9rem 2.5rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    color: #fff;
    border: none;
    border-radius: 50px;
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    box-shadow: 0 4px 20px rgba(37, 99, 235, 0.3);
}

#enter-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(37, 99, 235, 0.5);
}

.entry-back {
    display: block;
    margin-top: 1.25rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.entry-back:hover {
    color: var(--primary);
}

/* ========================================
   HUD
   ======================================== */
#hud {
    position: fixed;
    inset: 0;
    z-index: 100;
    pointer-events: none;
}

#crosshair {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: rgba(30, 41, 59, 0.35);
    font-size: 20px;
    font-weight: 300;
    user-select: none;
}

#back-link {
    position: absolute;
    top: 1.25rem;
    left: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(139, 115, 85, 0.15);
    border-radius: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-family: var(--font-display);
    font-size: 0.8rem;
    font-weight: 500;
    pointer-events: all;
    transition: all var(--transition-fast);
}

#back-link:hover {
    background: rgba(255, 255, 255, 0.95);
    color: var(--text-primary);
    border-color: rgba(37, 99, 235, 0.2);
}

#controls-hint {
    position: absolute;
    bottom: 1.25rem;
    left: 50%;
    transform: translateX(-50%);
    padding: 0.5rem 1.25rem;
    background: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid rgba(139, 115, 85, 0.12);
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 0.75rem;
    letter-spacing: 0.03em;
    white-space: nowrap;
}

/* ========================================
   Minimap
   ======================================== */
#minimap {
    position: absolute;
    top: 1.25rem;
    right: 1.25rem;
    width: 180px;
    height: 180px;
    border-radius: 50%;
    pointer-events: none;
    opacity: 0.9;
}

/* ========================================
   Paper Preview Panel
   ======================================== */
#paper-preview {
    position: fixed;
    right: 1.5rem;
    bottom: 5rem;
    width: 340px;
    max-height: 50vh;
    padding: 1.5rem;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(139, 115, 85, 0.15);
    border-left: 3px solid var(--primary);
    border-radius: 12px;
    z-index: 200;
    transform: translateX(0);
    transition: transform var(--transition-base), opacity var(--transition-base);
    overflow-y: auto;
}

#paper-preview.slide-out {
    transform: translateX(calc(100% + 2rem));
    opacity: 0;
}

.preview-number {
    font-family: var(--font-display);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 0.5rem;
}

.preview-title {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.4;
    margin-bottom: 0.5rem;
}

.preview-authors {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    line-height: 1.4;
}

.preview-abstract {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 0.75rem;
    display: -webkit-box;
    -webkit-line-clamp: 4;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.preview-hint {
    font-size: 0.75rem;
    color: var(--primary);
}

.preview-hint kbd {
    display: inline-block;
    padding: 0.1rem 0.4rem;
    background: rgba(37, 99, 235, 0.08);
    border: 1px solid rgba(37, 99, 235, 0.2);
    border-radius: 3px;
    font-family: var(--font-display);
    font-size: 0.7rem;
}

/* ========================================
   Paper Detail Modal
   ======================================== */
#paper-modal {
    position: fixed;
    inset: 0;
    z-index: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(245, 240, 232, 0.7);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.modal-content {
    position: relative;
    width: 90%;
    max-width: 680px;
    max-height: 85vh;
    padding: 2.5rem;
    background: #fff;
    border: 1px solid rgba(139, 115, 85, 0.15);
    border-radius: 16px;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(139, 115, 85, 0.08);
}

.modal-close {
    position: sticky;
    top: 0;
    float: right;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(30, 41, 59, 0.05);
    border: 1px solid rgba(30, 41, 59, 0.1);
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 1.25rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    z-index: 1;
}

.modal-close:hover {
    background: rgba(30, 41, 59, 0.1);
    color: var(--text-primary);
}

.modal-number {
    font-family: var(--font-display);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--primary);
    letter-spacing: 0.08em;
    margin-bottom: 0.75rem;
}

.modal-title {
    font-family: var(--font-display);
    font-size: clamp(1.25rem, 3vw, 1.6rem);
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.35;
    margin-bottom: 1.25rem;
}

.modal-authors {
    margin-bottom: 1.5rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.author-card {
    padding: 0.75rem 1rem;
    background: rgba(245, 240, 232, 0.5);
    border: 1px solid rgba(139, 115, 85, 0.1);
    border-radius: 8px;
}

.author-name {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-primary);
    margin-bottom: 0.15rem;
}

.author-name a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.author-name a:hover {
    color: var(--primary-dark);
}

.author-affiliation {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 0.15rem;
}

.author-email {
    font-size: 0.75rem;
    color: var(--text-light);
}

.author-email a {
    color: var(--primary);
    text-decoration: none;
}

.modal-bios {
    margin-top: 1.5rem;
    padding-top: 1.25rem;
    border-top: 1px solid rgba(139, 115, 85, 0.12);
}

.modal-bios-label {
    font-family: var(--font-display);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--accent, #2563eb);
    margin-bottom: 0.75rem;
}

.modal-bio-entry {
    margin-bottom: 0.85rem;
}

.modal-bio-entry:last-child {
    margin-bottom: 0;
}

.modal-bio-name {
    font-weight: 600;
    font-size: 0.82rem;
    color: var(--text-primary);
    margin-bottom: 0.2rem;
}

.modal-bio-text {
    font-size: 0.78rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.modal-abstract-label {
    font-family: var(--font-display);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 0.5rem;
}

.modal-abstract {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.modal-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.modal-actions a {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.6rem 1.25rem;
    border-radius: 8px;
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 500;
    text-decoration: none;
    transition: all var(--transition-fast);
}

.btn-pdf {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
}

.btn-pdf:hover {
    box-shadow: 0 4px 16px rgba(37, 99, 235, 0.4);
    transform: translateY(-1px);
}

.btn-video {
    background: rgba(6, 182, 212, 0.1);
    border: 1px solid rgba(6, 182, 212, 0.2);
    color: #06b6d4;
}

.btn-video:hover {
    background: rgba(6, 182, 212, 0.18);
}

/* ========================================
   Mobile Controls
   ======================================== */
#mobile-controls {
    position: fixed;
    inset: 0;
    z-index: 150;
    pointer-events: none;
}

#joystick-zone {
    position: absolute;
    bottom: 60px;
    left: 40px;
    width: 120px;
    height: 120px;
    pointer-events: all;
}

#joystick-base {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    border: 2px solid rgba(37, 99, 235, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
}

#joystick-thumb {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.4), rgba(37, 99, 235, 0.15));
    border: 2px solid rgba(37, 99, 235, 0.3);
    transition: transform 0.05s ease-out;
}

/* ========================================
   Responsive / Mobile
   ======================================== */
.desktop-only { display: inline; }
.mobile-only { display: none; }

@media (max-width: 768px) {
    .desktop-only { display: none !important; }
    .mobile-only { display: inline !important; }

    #paper-preview {
        right: 0.75rem;
        left: 0.75rem;
        bottom: 12rem;
        width: auto;
        max-height: 35vh;
        padding: 1rem;
    }

    .preview-title { font-size: 0.9rem; }
    .preview-abstract { -webkit-line-clamp: 3; }

    .modal-content {
        width: 95%;
        padding: 1.5rem;
        max-height: 80vh;
    }

    #controls-hint {
        bottom: 11rem;
    }

    #crosshair { display: none; }

    #minimap {
        width: 120px;
        height: 120px;
        top: 0.75rem;
        right: 0.75rem;
    }
}

/* ========================================
   Scrollbar (for modal/preview)
   ======================================== */
.modal-content::-webkit-scrollbar,
#paper-preview::-webkit-scrollbar {
    width: 4px;
}

.modal-content::-webkit-scrollbar-track,
#paper-preview::-webkit-scrollbar-track {
    background: transparent;
}

.modal-content::-webkit-scrollbar-thumb,
#paper-preview::-webkit-scrollbar-thumb {
    background: rgba(37, 99, 235, 0.15);
    border-radius: 2px;
}