/*
 * Enhanced Portfolio Styles for Yash Saxena
 * A sophisticated, memorable design with bold typography and atmospheric depth
 */

/*
 * Color Palette & Theme System
 * 
 * This design uses a refined academic aesthetic with deep navy foundations,
 * warm accents, and sophisticated gradients that create depth and atmosphere.
 */
:root {
    /* Light theme - Sophisticated Academic */
    --bg-primary: #fafbfd;
    --bg-section: #ffffff;
    --bg-alternate: #f8f9fb;
    --card-bg: #ffffff;
    --card-border: #e8ecf4;
    --text-color: #1a2332;
    --text-secondary: #4a5568;
    --accent: #2563eb;              /* Rich blue */
    --accent-2: #7c3aed;            /* Deep violet */
    --accent-warm: #f59e0b;         /* Amber accent */
    --navbar-bg: rgba(255, 255, 255, 0.85);
    --hero-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --timeline-line-color: #2563eb;
    --glow-accent: rgba(37, 99, 235, 0.15);
}

/* Dark theme - Midnight Scholar */
body.dark-mode {
    --bg-primary: #0a0e1a;
    --bg-section: #111827;
    --bg-alternate: #0d1117;
    --card-bg: #1a1f35;
    --card-border: #2d3548;
    --text-color: #e8edf5;
    --text-secondary: #9ca3af;
    --accent: #60a5fa;
    --accent-2: #a78bfa;
    --accent-warm: #fbbf24;
    --navbar-bg: rgba(10, 14, 26, 0.9);
    --hero-gradient: linear-gradient(135deg, #4c1d95 0%, #1e3a8a 100%);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --timeline-line-color: #60a5fa;
    --glow-accent: rgba(96, 165, 250, 0.2);
}

/* Global Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text-color);
    background-color: var(--bg-primary);
    scroll-behavior: smooth;
    line-height: 1.6;
    overflow-x: hidden;
}

/* Typography System */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Playfair Display', Georgia, serif;
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    position: relative;
    display: inline-block;
}

h2::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 60px;
    height: 4px;
    background: var(--hero-gradient);
    border-radius: 2px;
}

code, .code {
    font-family: 'JetBrains Mono', monospace;
    background: var(--card-bg);
    padding: 0.2em 0.4em;
    border-radius: 4px;
    font-size: 0.9em;
}

/* Smooth Section Transitions */
section {
    position: relative;
    background-color: var(--bg-section);
    color: var(--text-color);
    transition: background-color 0.3s ease;
}

/* Alternate section backgrounds for better visual hierarchy */
section.bg-alternate {
    background-color: var(--bg-alternate) !important;
}

/* Utility Classes */
.text-accent {
    background: var(--hero-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 600;
}

.bg-accent {
    background: var(--hero-gradient) !important;
    color: #fff !important;
}

/* Enhanced Buttons */
.btn-accent {
    background: var(--hero-gradient);
    color: #fff;
    border: none;
    padding: 0.75rem 2rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    border-radius: 8px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px var(--glow-accent);
    position: relative;
    overflow: hidden;
}

.btn-accent::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s ease;
}

.btn-accent:hover::before {
    left: 100%;
}

.btn-accent:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--glow-accent);
    color: #fff;
}

.btn-outline-accent {
    color: var(--accent);
    border: 2px solid var(--accent);
    background-color: transparent;
    padding: 0.75rem 2rem;
    font-weight: 600;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.btn-outline-accent:hover {
    background: var(--hero-gradient);
    border-color: transparent;
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--glow-accent);
}

/* Enhanced Navbar */
.navbar {
    background-color: var(--navbar-bg);
    backdrop-filter: blur(12px) saturate(180%);
    box-shadow: 0 2px 16px rgba(0, 0, 0, 0.08);
    padding: 1rem 0;
    transition: all 0.3s ease;
}

.navbar-brand {
    font-family: 'Playfair Display', serif;
    font-weight: 900;
    font-size: 1.5rem;
    background: var(--hero-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.navbar .nav-link {
    color: var(--text-color);
    margin: 0 0.5rem;
    font-weight: 500;
    transition: all 0.2s ease;
    position: relative;
}

.navbar .nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--hero-gradient);
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.navbar .nav-link:hover::after,
.navbar .nav-link.active::after {
    width: 80%;
}

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

/* Hero Section - Bold & Memorable */
#hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: var(--bg-section);
    overflow: hidden;
}

/* Animated gradient background */
#hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: 
        radial-gradient(circle at 30% 50%, var(--glow-accent) 0%, transparent 50%),
        radial-gradient(circle at 70% 50%, rgba(124, 58, 237, 0.1) 0%, transparent 50%);
    animation: rotate 20s linear infinite;
    opacity: 0.6;
}

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

#hero .container {
    position: relative;
    z-index: 1;
    animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

#hero h1 {
    font-size: 4rem;
    font-weight: 900;
    margin-bottom: 1rem;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

#hero .lead {
    font-size: 1.25rem;
    max-width: 700px;
    margin: 0 auto 2rem;
    color: var(--text-color);
    line-height: 1.8;
    animation: fadeInUp 0.8s ease-out 0.4s both;
    font-weight: 500;
}

#hero .btn {
    min-width: 180px;
    animation: fadeInUp 0.8s ease-out 0.6s both;
}

#hero .social-icons {
    animation: fadeInUp 0.8s ease-out 0.8s both;
}

#hero .social-icons a {
    color: var(--accent);
    margin: 0 0.75rem;
    transition: all 0.3s ease;
    display: inline-block;
}

#hero .social-icons a:hover {
    color: var(--accent-2);
    transform: translateY(-4px) scale(1.1);
}

/* Typed role effect */
#typed-role {
    font-family: 'JetBrains Mono', monospace;
    color: var(--accent);
    font-weight: 600;
    font-size: 1.5rem;
    min-height: 2rem;
    display: inline-block;
}

/* Profile Photo - Circular presentation */
.profile-photo {
    max-width: 100%;
    height: auto;
    border-radius: 50%;
    object-fit: cover;
    box-shadow: var(--shadow-lg);
    border: 6px solid var(--card-border);
    transition: all 0.3s ease;
    animation: fadeIn 0.8s ease-out;
    aspect-ratio: 1 / 1;
}

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

.profile-photo:hover {
    transform: scale(1.02) rotate(1deg);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
}

/* Stats Section - Eye-catching */
.stats-section {
    background: var(--bg-section);
    padding: 5rem 0;
    position: relative;
    overflow: hidden;
}

.stats-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
}

.counter-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 2.5rem 1.5rem;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.counter-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--hero-gradient);
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

.counter-card:hover::before {
    transform: scaleX(1);
}

.counter-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent);
}

.counter-card .icon {
    font-size: 3rem;
    background: var(--hero-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
}

.counter-card .counter {
    font-size: 3.5rem;
    font-weight: 700;
    background: var(--hero-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-family: 'Playfair Display', serif;
}

.counter-card p {
    margin: 0.5rem 0 0 0;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 1.1rem;
}

/* Research Focus Cards - Interactive & Memorable */
.focus-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.focus-card::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: radial-gradient(circle, var(--glow-accent) 0%, transparent 70%);
    transform: translate(-50%, -50%);
    transition: all 0.5s ease;
    border-radius: 50%;
}

.focus-card:hover::before {
    width: 300px;
    height: 300px;
}

.focus-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent);
}

.focus-card .focus-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    background: var(--hero-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transition: transform 0.3s ease;
    position: relative;
    z-index: 1;
}

.focus-card:hover .focus-icon {
    transform: scale(1.1) rotate(5deg);
}

.focus-card h5 {
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
    position: relative;
    z-index: 1;
}

.focus-card p {
    color: var(--text-secondary);
    margin-bottom: 0;
    font-size: 0.95rem;
    line-height: 1.6;
    position: relative;
    z-index: 1;
}

/* Skills Cards - Clean & Professional */
.skills-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.skills-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.skills-card h5 {
    color: var(--accent);
    font-weight: 700;
    font-size: 1.2rem;
    margin-bottom: 1rem;
}

.skills-card ul li {
    margin-bottom: 0.5rem;
    position: relative;
    padding-left: 1.5rem;
    color: var(--text-secondary);
}

.skills-card ul li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: bold;
}

/* Enhanced Timeline */
.timeline {
    position: relative;
    margin-top: 3rem;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 1.2rem;
    width: 3px;
    background: linear-gradient(180deg, var(--accent), var(--accent-2));
    opacity: 0.3;
    border-radius: 2px;
}

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
    padding-left: 3.5rem;
    animation: fadeInLeft 0.6s ease-out both;
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.timeline-icon {
    position: absolute;
    left: 0;
    top: 0;
    background: var(--hero-gradient);
    color: #fff;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    box-shadow: 0 4px 12px var(--glow-accent);
    z-index: 1;
}

.timeline-content {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.timeline-content:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(8px);
}

.timeline-content h5 {
    color: var(--text-color);
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.timeline-content .text-muted {
    color: var(--text-secondary) !important;
    font-size: 0.9rem;
    font-style: italic;
}

.timeline-content ul {
    padding-left: 1.5rem;
    margin-bottom: 0;
    margin-top: 1rem;
}

.timeline-content ul li {
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

/* Publication & Presentation Cards - Editorial Style */
.publication-card,
.presentation-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.publication-card::before,
.presentation-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--hero-gradient);
    transform: scaleY(0);
    transition: transform 0.3s ease;
}

.publication-card:hover::before,
.presentation-card:hover::before {
    transform: scaleY(1);
}

.publication-card:hover,
.presentation-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.publication-card h5 a,
.publication-card h6 a,
.presentation-card h5 {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 700;
    transition: color 0.2s ease;
}

.publication-card h5 a:hover,
.publication-card h6 a:hover {
    color: var(--accent);
}

.publication-card h6 {
    font-weight: 700;
    color: var(--accent);
    font-size: 1.1rem;
}

.publication-card .badge,
.presentation-card .badge {
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    color: white;
    padding: 0.35em 0.75em;
    border-radius: 6px;
    font-weight: 500;
    font-size: 0.8rem;
}

/* Conference Badge Styling */
.conference-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    color: white;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 1rem;
    box-shadow: 0 2px 8px var(--glow-accent);
}

.conference-badge i {
    font-size: 1.1rem;
}

.conference-badge.under-review {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    box-shadow: 0 2px 8px rgba(245, 158, 11, 0.3);
}

.conference-badge.in-preparation {
    background: linear-gradient(135deg, #6b7280, #4b5563);
    box-shadow: 0 2px 8px rgba(107, 114, 128, 0.3);
}

/* Awards Section */
.timeline-awards {
    list-style: none;
    padding: 0;
}

.timeline-awards li {
    position: relative;
    padding: 1.25rem 1.5rem 1.25rem 3.5rem;
    margin-bottom: 1.5rem;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.timeline-awards li::before {
    content: '\f3c5';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.5rem;
    background: var(--hero-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.timeline-awards li:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-md);
}

.timeline-awards .badge {
    background: var(--hero-gradient);
    color: white;
    font-weight: 600;
    padding: 0.4em 0.8em;
    border-radius: 6px;
    margin-right: 0.75rem;
}

/* Modals - Enhanced */
.modal-content {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    border-bottom: 1px solid var(--card-border);
    background: var(--bg-section);
}

.modal-title {
    color: var(--accent);
    font-weight: 700;
}

.modal-body {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* Scroll to Top Button - Stylish */
#scrollTopBtn {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 3.5rem;
    height: 3.5rem;
    border-radius: 50%;
    background: var(--hero-gradient);
    color: #fff;
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 16px var(--glow-accent);
}

#scrollTopBtn.show {
    display: flex;
    animation: fadeInUp 0.3s ease-out;
}

#scrollTopBtn:hover {
    transform: translateY(-4px) scale(1.05);
    box-shadow: 0 6px 24px var(--glow-accent);
}

/* Footer */
footer {
    background: var(--bg-section);
    color: var(--text-secondary);
    border-top: 1px solid var(--card-border);
}

/* Dark Mode Toggle - Elegant */
#darkModeToggle {
    padding: 0.5rem 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    transition: all 0.3s ease;
}

#darkModeToggle:hover {
    background: var(--glow-accent);
    transform: scale(1.05);
}

#darkModeToggle i {
    font-size: 1.25rem;
}

/* Responsive Design */
@media (max-width: 991.98px) {
    h1 { font-size: 3rem; }
    h2 { font-size: 2rem; }
    
    #hero {
        min-height: 80vh;
        padding-top: 5rem;
    }
    
    .timeline::before {
        left: 1rem;
    }
    
    .timeline-item {
        padding-left: 3rem;
    }
}

@media (max-width: 767.98px) {
    h1 { font-size: 2.5rem; }
    
    #hero .lead {
        font-size: 1.1rem;
    }
    
    .counter-card {
        margin-bottom: 1rem;
    }
    
    #scrollTopBtn {
        bottom: 1.5rem;
        right: 1.5rem;
        width: 3rem;
        height: 3rem;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Print Styles */
@media print {
    .navbar,
    #scrollTopBtn,
    #darkModeToggle {
        display: none !important;
    }
    
    body {
        background: white;
        color: black;
    }
}