/* ===== MINIMALIST DESIGN SYSTEM ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Minimalist Color Palette */
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --border-color: #e5e7eb;
    --border-light: #f3f4f6;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    /* Spacing - Compact Design */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 12px;
    --space-lg: 16px;
    --space-xl: 24px;
    --space-2xl: 32px;
    --space-3xl: 48px;
    
    /* Border radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    
    /* Transitions */
    --transition: 0.2s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1024px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* ===== NAVIGATION ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all var(--transition);
}

.nav-container {
    max-width: 1024px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
}

.nav-brand {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    text-decoration: none;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--space-xl);
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 14px;
    transition: color var(--transition);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: var(--space-xs);
}

.hamburger span {
    width: 20px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition);
}

/* ===== HERO SECTION ===== */
.hero {
    min-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
    position: relative;
    padding-top: 80px; /* Add space for fixed navbar */
    padding-bottom: var(--space-3xl); /* Add space before next section */
}

.hero-background {
    display: none; /* Remove particle background */
}

.hero-content {
    text-align: center;
    max-width: 1024px;
    padding: 0 var(--space-lg);
}

.hero-badges {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    margin-bottom: var(--space-lg);
    flex-wrap: wrap;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-lg);
    font-size: 14px;
    font-weight: 500;
    transition: all var(--transition);
}

.conference-badge {
    background: linear-gradient(135deg, #6b7280 0%, #4b5563 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(107, 114, 128, 0.2);
}

.conference-badge:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(107, 114, 128, 0.3);
}

.journal-badge {
    background: linear-gradient(135deg, #64748b 0%, #475569 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(100, 116, 139, 0.2);
}

.journal-badge:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(100, 116, 139, 0.3);
}

.hero-teaser {
    margin-bottom: var(--space-lg);
    display: flex;
    justify-content: center;
}

.hero-teaser img {
    max-width: 100%;
    max-height: 400px;
    width: auto;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    -o-object-fit: contain;
    object-fit: contain;
    transition: transform var(--transition);
}

.hero-teaser img:hover {
    transform: scale(1.02);
}

h1.hero-title {
    margin-bottom: var(--space-lg) !important;
    font-size: 3.5rem !important; /* fallback for older Safari */
    font-size: clamp(3rem, 6vw, 4.5rem) !important;
    font-weight: 700 !important;
    line-height: 1.2 !important;
    color: var(--text-primary) !important;
    text-align: center !important;
    display: block !important;
}

.authors {
    margin-bottom: var(--space-xl);
}

.author-group {
    margin-bottom: var(--space-md);
}

.author {
    display: inline-block;
    margin: 0 var(--space-md) var(--space-sm) 0;
    font-size: 16px;
    font-weight: 500;
    color: var(--text-primary);
}

.affiliations {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.4;
}

.affiliation {
    display: inline-block;
    margin: 0 var(--space-md) var(--space-xs) 0;
}

.hero-buttons {
    display: -webkit-flex;
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--space-2xl);
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 14px;
    transition: all var(--transition);
    border: 1px solid transparent;
    cursor: pointer;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
    background: var(--bg-secondary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.scroll-indicator {
    display: none; /* Remove bounce animation */
}

/* ===== SECTIONS ===== */
.section {
    padding: var(--space-2xl) 0;
    position: relative;
}

/* Specific section backgrounds for clear distinction */
#home {
    background: var(--bg-primary);
}

#video {
    background: #f8f9fa !important;
}

.video-section {
    background: #f8f9fa !important;
}

#abstract {
    background: var(--bg-primary) !important;
}

#method {
    background: var(--bg-secondary) !important;
}

#results {
    background: var(--bg-primary) !important;
}

#downloads, .downloads-section {
    background: var(--bg-secondary) !important;
}

#acknowledgement {
    background: var(--bg-primary) !important;
}

#bibtex {
    background: var(--bg-secondary) !important;
}

.section-title {
    font-size: 1.75rem; /* fallback for older Safari */
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--space-xl);
    color: var(--text-primary);
}

/* ===== ABSTRACT SECTION ===== */

.abstract-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--space-2xl);
    align-items: start;
}

.abstract-text {
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-secondary);
}

.abstract-text p {
    margin-bottom: var(--space-md);
}

.abstract-visual {
    position: relative;
}

.teaser-image {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    background: var(--bg-tertiary);
    max-width: 1024px;
    margin: 0 auto;
}

.teaser-image img {
    width: 100%;
    height: auto;
    max-width: 1024px;
    margin: 0 auto;
    display: block;
}

.image-caption {
    padding: var(--space-md);
    font-size: 13px;
    color: var(--text-light);
    text-align: left;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-light);
}

/* ===== VIDEO SECTION ===== */
.video-section {
    padding: var(--space-2xl) 0;
    background: #f8f9fa !important;
}

.video-container {
    max-width: 1024px;
    margin: 0 auto;
}

.video-platform-selector {
    display: flex;
    justify-content: center;
    gap: 0;
    margin-bottom: var(--space-xl);
    background: rgba(255, 255, 255, 0.8);
    border-radius: var(--radius-lg);
    padding: 4px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    width: fit-content;
    margin-left: auto;
    margin-right: auto;
}

.platform-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    font-family: inherit;
    border-radius: calc(var(--radius-lg) - 4px);
    cursor: pointer;
    transition: all var(--transition);
    min-width: 120px;
    justify-content: center;
}

.platform-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.5);
}

.platform-btn.active {
    background: var(--bg-primary);
    color: var(--text-primary);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.platform-btn svg {
    transition: all var(--transition);
}

.platform-btn[data-platform="youtube"] svg {
    color: #FF0000;
}

.platform-btn[data-platform="bilibili"] svg {
    color: #00A1D6;
}

.platform-btn:not(.active) svg {
    color: var(--text-light);
}

.platform-btn.active[data-platform="youtube"] svg {
    color: #FF0000;
}

.platform-btn.active[data-platform="bilibili"] svg {
    color: #00A1D6;
}

.video-wrapper {
    position: relative;
    width: 100%;
    height: 0;
    padding-bottom: 56.25%;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    background: var(--bg-tertiary);
}

.video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* ===== METHOD SECTION ===== */

.method-overview {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
    align-items: center;
}

.method-diagram {
    position: relative;
    width: 100%;
    max-width: 1024px;
    margin: 0 auto;
}

.method-diagram img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    background: var(--bg-tertiary);
}

.method-steps {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.step {
    display: flex;
    gap: var(--space-md);
    align-items: flex-start;
    padding: var(--space-lg);
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    transition: all var(--transition);
}

.step:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.step-number {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    font-weight: 600;
    font-size: 14px;
}

.step-content h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: var(--space-xs);
    color: var(--text-primary);
}

.step-content p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.5;
}

/* ===== RESULTS SECTION ===== */

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-3xl);
}

.result-item {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: visible;
    background: var(--bg-primary);
    border: 1px solid var(--border-light);
    transition: all var(--transition);
    height: 350px;
    display: flex;
    flex-direction: column;
}

.result-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.result-image {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-lg);
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 200px;
}

.result-image img {
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    -o-object-fit: contain;
    object-fit: contain;
}

.result-overlay {
    padding: var(--space-md);
    background: var(--bg-primary);
    flex-shrink: 0;
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.result-info h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: var(--space-xs);
    color: var(--text-primary);
}

.result-info p {
    font-size: 14px;
    color: var(--text-secondary);
}

.fabrication-section {
    text-align: center;
    margin-top: var(--space-2xl);
}

.fabrication-section h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: var(--space-xl);
    color: var(--text-primary);
}

.fabrication-showcase {
    max-width: 1024px;
    margin: 0 auto;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    background: var(--bg-tertiary);
}

.fabrication-showcase img {
    width: 100%;
    height: auto;
    display: block;
}

.fabrication-caption {
    padding: var(--space-lg);
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-secondary);
    background: var(--bg-primary);
    border-top: 1px solid var(--border-light);
}

/* ===== DOWNLOADS SECTION ===== */

.downloads-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-xl);
    max-width: 1024px;
    margin: 0 auto;
}

.download-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    text-align: center;
    transition: all var(--transition);
}

.download-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.download-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto var(--space-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    font-size: 20px;
    color: var(--primary-color);
}

.download-card h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.download-card p {
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    font-size: 14px;
    line-height: 1.5;
}

.download-btn {
    display: inline-block;
    padding: var(--space-sm) var(--space-md);
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    transition: all var(--transition);
}

.download-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

/* ===== ACKNOWLEDGEMENT SECTION ===== */
.acknowledgement-content {
    max-width: 1024px;
    margin: 0 auto;
    text-align: left;
}

.acknowledgement-content p {
    font-size: 16px;
    line-height: 1.8;
    color: var(--text-secondary);
    font-style: italic;
}

/* ===== BIBTEX SECTION ===== */

.bibtex-container {
    position: relative;
    max-width: 1024px;
    margin: 0 auto;
}

.bibtex-container pre {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.5;
    position: relative;
    color: var(--text-primary);
}

.copy-btn {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    background: var(--primary-color);
    color: white;
    border: none;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 12px;
    font-weight: 500;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.copy-btn:hover {
    background: var(--primary-dark);
}

/* ===== FOOTER ===== */
.footer {
    background: var(--bg-secondary);
    padding: var(--space-2xl) 0;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.footer-info p {
    margin-bottom: var(--space-xs);
    color: var(--text-secondary);
    font-size: 14px;
}

.footer-links {
    display: flex;
    gap: var(--space-md);
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 16px;
    transition: color var(--transition);
    padding: var(--space-sm);
}

.footer-links a:hover {
    color: var(--primary-color);
}



/* ===== SAFARI SPECIFIC FIXES ===== */
/* Detect Safari and apply fixes */
@media not all and (min-resolution:.001dpcm) {
    @supports (-webkit-appearance:none) {
        .hero-title {
            font-size: 3.5rem !important;
        }
        
        .navbar {
            background: rgba(255, 255, 255, 0.98) !important;
            -webkit-backdrop-filter: none !important;
            backdrop-filter: none !important;
        }
    }
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--space-md);
    }
    
    .hero-teaser img {
        max-width: 100%;
        max-height: 250px;
    }
    
    .nav-menu {
        position: fixed;
        top: 60px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 60px);
        background: var(--bg-primary);
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        padding-top: var(--space-2xl);
        transition: left var(--transition);
        border-top: 1px solid var(--border-color);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    .abstract-content,
    .method-overview {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 200px;
        justify-content: center;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .results-grid {
        grid-template-columns: 1fr;
    }
    
    .downloads-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .download-card {
        padding: var(--space-lg);
    }
    
    .hero-buttons {
        gap: var(--space-sm);
    }
    
    .btn {
        padding: var(--space-sm) var(--space-md);
        font-size: 13px;
    }
    
    .hero-teaser img {
        max-width: 100%;
        max-height: 180px;
    }
}

/* ===== UTILITY CLASSES ===== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

/* ===== FOCUS STYLES ===== */
*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.btn:focus,
.nav-link:focus {
    outline-offset: 4px;
}

/* Remove excessive animations and effects */
.animate-on-scroll,
.particle-container,
.scroll-arrow,
.custom-cursor {
    display: none !important;
}

/* Simplify hover effects */
.result-item .result-overlay {
    position: static;
    transform: none;
    transition: none;
}

.teaser-image {
    transform: none;
    transition: none;
}

.teaser-image:hover {
    transform: none;
}