/* ========================================
   AI Researcher Portfolio - Premium Theme
   ======================================== */

/* CSS Variables */
:root {
    /* Light Theme - Pure White */
    --bg-primary: #ffffff;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f8f9fa;
    --text-primary: #1a1a2e;
    --text-secondary: #4a5568;
    --text-muted: #718096;
    --accent: #2563eb;
    --accent-light: #3b82f6;
    --accent-dark: #1d4ed8;
    --accent-gradient: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
    --success: #10b981;
    --border: rgba(0, 0, 0, 0.08);
    --card-bg: #ffffff;
    --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    --code-bg: #1e293b;
    
    /* Gradient Orbs - Disabled */
    --orb-1: transparent;
    --orb-2: transparent;
    --orb-3: transparent;
    
    /* Background Patterns - Disabled */
    --pattern-dot: transparent;
    --grid-line: transparent;
    
    /* Fonts */
    --font-sans: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'IBM Plex Mono', 'Fira Code', monospace;
    
    /* Transitions */
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Theme - Clean Dark */
[data-theme="dark"] {
    --bg-primary: #111111;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #222222;
    --text-primary: #f5f5f5;
    --text-secondary: #a0a0a0;
    --text-muted: #707070;
    --accent: #3b82f6;
    --accent-light: #60a5fa;
    --accent-dark: #2563eb;
    --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    --success: #34d399;
    --border: rgba(255, 255, 255, 0.08);
    --card-bg: #1a1a1a;
    --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    --code-bg: #0d0d0d;
    
    /* Gradient Orbs - Disabled */
    --orb-1: transparent;
    --orb-2: transparent;
    --orb-3: transparent;
    
    /* Background Patterns - Disabled */
    --pattern-dot: transparent;
    --grid-line: transparent;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    transition: background var(--transition), color var(--transition);
    overflow-x: hidden;
    position: relative;
}

/* Static Background Pattern */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 25% 25%, var(--pattern-dot) 1px, transparent 1px),
        radial-gradient(circle at 75% 75%, var(--pattern-dot) 1px, transparent 1px);
    background-size: 50px 50px;
    opacity: 0.4;
    pointer-events: none;
    z-index: 0;
}

/* Grid Lines */
body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(var(--grid-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
    background-size: 100px 100px;
    opacity: 0.3;
    pointer-events: none;
    z-index: 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    position: relative;
    z-index: 1;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition);
}

/* Typography */
h1, h2, h3, h4 {
    font-weight: 600;
    line-height: 1.3;
}

strong {
    color: var(--accent);
}

.highlight {
    color: var(--accent);
    font-weight: 500;
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(var(--bg-primary-rgb, 250, 251, 252), 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    transition: all var(--transition);
}

[data-theme="dark"] .navbar {
    background: rgba(15, 15, 26, 0.85);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    transition: color var(--transition);
}

.logo:hover {
    color: var(--accent);
}

.nav-center {
    display: flex;
    gap: 32px;
}

.nav-link {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: 8px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-gradient);
    transition: width var(--transition);
}

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

.nav-link:hover::after {
    width: 100%;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.theme-toggle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: var(--bg-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
}

.theme-toggle:hover {
    border-color: var(--accent);
    transform: rotate(180deg);
}

.theme-toggle .fa-sun {
    display: none;
    color: #fbbf24;
}

.theme-toggle .fa-moon {
    display: block;
    color: var(--text-secondary);
}

[data-theme="dark"] .theme-toggle .fa-sun {
    display: block;
}

[data-theme="dark"] .theme-toggle .fa-moon {
    display: none;
}

.btn-hire {
    padding: 10px 20px;
    background: var(--accent-gradient);
    color: white;
    font-weight: 600;
    font-size: 14px;
    border-radius: 8px;
    transition: transform var(--transition), box-shadow var(--transition);
}

.btn-hire:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(59, 130, 246, 0.35);
}

/* Mobile Navigation */
.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.mobile-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition);
}

.mobile-menu {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    padding: 24px;
    display: none;
    flex-direction: column;
    gap: 16px;
    border-bottom: 1px solid var(--border);
    z-index: 999;
}

.mobile-menu.active {
    display: flex;
}

.mobile-link {
    font-size: 16px;
    font-weight: 500;
    color: var(--text-secondary);
    padding: 8px 0;
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    padding: 120px 0 80px;
    overflow: hidden;
}

/* Decorative Corner Elements */
.hero::before {
    content: '';
    position: absolute;
    top: 100px;
    left: 30px;
    width: 200px;
    height: 200px;
    border: 2px solid var(--accent);
    border-radius: 50%;
    opacity: 0.1;
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: 50px;
    right: 50px;
    width: 150px;
    height: 150px;
    border: 2px solid var(--accent);
    opacity: 0.1;
    transform: rotate(45deg);
    pointer-events: none;
}

.hero-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.8;
    animation: float 20s ease-in-out infinite;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: var(--orb-1);
    top: -200px;
    right: -100px;
    animation-delay: 0s;
}

.orb-2 {
    width: 500px;
    height: 500px;
    background: var(--orb-2);
    bottom: -150px;
    left: -100px;
    animation-delay: -5s;
}

.orb-3 {
    width: 400px;
    height: 400px;
    background: var(--orb-3);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -10s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(30px, -30px) scale(1.05); }
    50% { transform: translate(-20px, 20px) scale(0.95); }
    75% { transform: translate(20px, 30px) scale(1.02); }
}

.hero .container {
    position: relative;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    border-radius: 24px;
    font-size: 13px;
    font-weight: 500;
    color: var(--success);
    margin-bottom: 24px;
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--success);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.2); }
}

.hero-name {
    font-size: clamp(40px, 6vw, 64px);
    font-weight: 700;
    margin-bottom: 16px;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-title {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 8px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
}

.hero-title .role {
    font-weight: 500;
}

.hero-title .separator {
    color: var(--accent);
}

.hero-tagline {
    font-size: 16px;
    color: var(--accent);
    font-weight: 500;
    margin-bottom: 20px;
}

.hero-description {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 24px;
    max-width: 500px;
}

.hero-stats {
    display: flex;
    gap: 32px;
    margin-bottom: 32px;
    padding: 20px 0;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.hero-stat {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--accent);
}

.stat-label {
    font-size: 13px;
    color: var(--text-muted);
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    font-weight: 600;
    font-size: 15px;
    border-radius: 10px;
    transition: all var(--transition);
}

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

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(59, 130, 246, 0.35);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.btn-large {
    padding: 18px 36px;
    font-size: 16px;
}

.hero-links {
    display: flex;
    gap: 12px;
}

.social-link {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all var(--transition);
}

.social-link:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-3px);
}

/* Code Block */
.hero-visual {
    position: relative;
}

/* Floating Decorative Elements */
.hero-visual::before {
    content: '';
    position: absolute;
    top: -30px;
    right: -20px;
    width: 60px;
    height: 60px;
    border: 2px dashed var(--accent);
    border-radius: 50%;
    opacity: 0.2;
    animation: rotate 20s linear infinite;
}

.hero-visual::after {
    content: '';
    position: absolute;
    bottom: -20px;
    left: -30px;
    width: 40px;
    height: 40px;
    border: 2px solid var(--accent);
    opacity: 0.2;
    transform: rotate(45deg);
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.code-block {
    background: var(--code-bg);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--card-shadow), 0 0 60px rgba(59, 130, 246, 0.15);
    position: relative;
}

.code-block::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(135deg, var(--accent), transparent, var(--accent));
    border-radius: 18px;
    z-index: -1;
    opacity: 0.3;
}

.code-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 16px 20px;
    background: rgba(0, 0, 0, 0.3);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red { background: #ff5f56; }
.dot.yellow { background: #ffbd2e; }
.dot.green { background: #27ca3f; }

.code-title {
    margin-left: 12px;
    font-family: var(--font-mono);
    font-size: 13px;
    color: #808090;
}

.code-content {
    padding: 24px;
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.8;
    color: #e0e0e8;
    overflow-x: auto;
}

.code-content .keyword { color: #c792ea; }
.code-content .class-name { color: #82aaff; }
.code-content .function { color: #82aaff; }
.code-content .param { color: #ff5370; }
.code-content .string { color: #c3e88d; }

/* ========================================
   Sections
   ======================================== */
.section {
    padding: 100px 0;
    position: relative;
    z-index: 1;
}

/* Decorative Lines on Sections */
.section::before {
    content: '';
    position: absolute;
    top: 50px;
    right: 5%;
    width: 100px;
    height: 2px;
    background: linear-gradient(90deg, var(--accent), transparent);
    opacity: 0.3;
}

.section::after {
    content: '';
    position: absolute;
    bottom: 50px;
    left: 5%;
    width: 80px;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent));
    opacity: 0.3;
}

.section-gradient {
    background: linear-gradient(180deg, var(--bg-tertiary) 0%, var(--bg-primary) 100%);
}

/* Decorative Plus Signs */
.section-gradient::before {
    content: '+';
    position: absolute;
    top: 80px;
    left: 8%;
    font-size: 40px;
    font-weight: 200;
    color: var(--accent);
    opacity: 0.15;
}

.section-gradient::after {
    content: '+';
    position: absolute;
    bottom: 80px;
    right: 8%;
    font-size: 30px;
    font-weight: 200;
    color: var(--accent);
    opacity: 0.15;
}

.section-title {
    font-size: 32px;
    margin-bottom: 48px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.section-number {
    font-family: var(--font-mono);
    font-size: 18px;
    color: var(--accent);
    font-weight: 500;
}

/* ========================================
   About Section
   ======================================== */
.about-content {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 60px;
}

.about-text p {
    margin-bottom: 20px;
    color: var(--text-secondary);
}

.about-text .lead {
    font-size: 18px;
    color: var(--text-primary);
}

.info-card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 28px;
    border: 1px solid var(--border);
    margin-bottom: 24px;
}

.info-card h3 {
    font-size: 16px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-primary);
}

.info-card h3 i {
    color: var(--accent);
}

.edu-item {
    position: relative;
    padding-left: 20px;
    margin-bottom: 20px;
    border-left: 2px solid var(--accent);
}

.edu-item:last-child {
    margin-bottom: 0;
}

.edu-badge, .edu-score {
    display: inline-block;
    font-size: 11px;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 12px;
    margin-bottom: 8px;
}

.edu-badge {
    background: rgba(16, 185, 129, 0.15);
    color: var(--success);
}

.edu-score {
    background: rgba(0, 102, 255, 0.15);
    color: var(--accent);
}

.edu-item h4 {
    font-size: 15px;
    margin-bottom: 4px;
}

.edu-item p {
    font-size: 13px;
    color: var(--text-muted);
}

.interest-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.interest-tags span {
    padding: 6px 14px;
    background: rgba(59, 130, 246, 0.1);
    color: var(--accent);
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
}

/* ========================================
   Research Section
   ======================================== */
.research-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.research-card {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 32px;
    border: 1px solid var(--border);
    position: relative;
    transition: all var(--transition);
}

.research-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-shadow);
}

.research-card.featured {
    border-color: var(--accent);
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.08) 0%, rgba(139, 92, 246, 0.03) 100%);
}

.research-badge {
    position: absolute;
    top: 24px;
    right: 24px;
    padding: 4px 12px;
    background: var(--accent-gradient);
    color: white;
    font-size: 11px;
    font-weight: 600;
    border-radius: 12px;
}

.research-icon {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    background: rgba(59, 130, 246, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.research-icon i {
    font-size: 24px;
    color: var(--accent);
}

.research-card h3 {
    font-size: 20px;
    margin-bottom: 8px;
}

.research-subtitle {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.research-desc {
    color: var(--text-secondary);
    font-size: 15px;
    margin-bottom: 16px;
}

.research-points {
    list-style: none;
    margin-bottom: 20px;
}

.research-points li {
    font-size: 14px;
    color: var(--text-secondary);
    padding: 6px 0;
    padding-left: 20px;
    position: relative;
}

.research-points li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--accent);
}

.research-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.research-tags span {
    padding: 4px 12px;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-size: 12px;
    border-radius: 6px;
    font-weight: 500;
}

/* ========================================
   Experience Section
   ======================================== */
.experience-timeline {
    position: relative;
    padding-left: 40px;
}

.experience-timeline::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--accent), var(--accent-light));
}

.exp-card {
    position: relative;
    background: var(--card-bg);
    border-radius: 16px;
    padding: 28px;
    border: 1px solid var(--border);
    margin-bottom: 24px;
    transition: all var(--transition);
}

.exp-card:hover {
    transform: translateX(5px);
    box-shadow: var(--card-shadow);
}

.exp-timeline-dot {
    position: absolute;
    left: -40px;
    top: 32px;
    width: 18px;
    height: 18px;
    background: var(--accent);
    border-radius: 50%;
    border: 4px solid var(--bg-primary);
}

.exp-header {
    display: flex;
    gap: 16px;
    margin-bottom: 16px;
}

.exp-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: rgba(59, 130, 246, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.exp-icon i {
    font-size: 20px;
    color: var(--accent);
}

.exp-meta h3 {
    font-size: 18px;
    margin-bottom: 4px;
}

.exp-company {
    font-size: 14px;
    color: var(--accent);
    margin-bottom: 4px;
}

.exp-date {
    font-size: 13px;
    color: var(--text-muted);
}

.exp-points {
    list-style: none;
    margin-bottom: 16px;
}

.exp-points li {
    font-size: 14px;
    color: var(--text-secondary);
    padding: 6px 0;
    padding-left: 20px;
    position: relative;
}

.exp-points li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--accent);
}

.exp-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.exp-tags span {
    padding: 4px 12px;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-size: 12px;
    border-radius: 6px;
    font-weight: 500;
}

/* ========================================
   Projects Section
   ======================================== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.project-card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 28px;
    border: 1px solid var(--border);
    transition: all var(--transition);
}

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

/* Corner Brackets on Hover */
.project-card::before,
.project-card::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    border-color: var(--accent);
    border-style: solid;
    opacity: 0;
    transition: opacity var(--transition);
}

.project-card::before {
    top: 10px;
    left: 10px;
    border-width: 2px 0 0 2px;
}

.project-card::after {
    bottom: 10px;
    right: 10px;
    border-width: 0 2px 2px 0;
}

.project-card:hover::before,
.project-card:hover::after {
    opacity: 0.5;
}

.project-card.featured {
    grid-column: span 2;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(139, 92, 246, 0.04) 100%);
    border-color: rgba(59, 130, 246, 0.35);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 16px;
}

.project-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: rgba(59, 130, 246, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
}

.project-icon i {
    font-size: 20px;
    color: var(--accent);
}

.project-links {
    display: flex;
    gap: 8px;
}

.project-link {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    transition: all var(--transition);
}

.project-link:hover {
    color: var(--accent);
    background: rgba(59, 130, 246, 0.1);
}

.project-label {
    font-size: 11px;
    font-weight: 600;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 12px;
}

.project-card h3 {
    font-size: 18px;
    margin-bottom: 12px;
}

.project-card p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.project-features {
    list-style: none;
    margin-bottom: 20px;
}

.project-features li {
    font-size: 13px;
    color: var(--text-secondary);
    padding: 6px 0;
    display: flex;
    align-items: center;
    gap: 8px;
}

.project-features li i {
    color: var(--success);
    font-size: 12px;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.project-tags span {
    padding: 4px 10px;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-size: 11px;
    border-radius: 6px;
    font-weight: 500;
}

/* ========================================
   Skills Section
   ======================================== */
.skills-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.skill-group {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 28px;
    border: 1px solid var(--border);
}

.skill-group h3 {
    font-size: 16px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.skill-group h3 i {
    color: var(--accent);
}

.skill-items {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.skill-tag {
    padding: 8px 16px;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    transition: all var(--transition);
}

.skill-tag:hover {
    color: var(--accent);
    transform: translateY(-2px);
}

.skill-tag.primary {
    background: rgba(59, 130, 246, 0.1);
    color: var(--accent);
    border: 1px solid rgba(59, 130, 246, 0.25);
}

/* ========================================
   Awards Section
   ======================================== */
.awards-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.award-card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 28px;
    text-align: center;
    border: 1px solid var(--border);
    transition: all var(--transition);
}

.award-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-shadow);
    border-color: var(--accent);
}

.award-icon {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.15) 0%, rgba(139, 92, 246, 0.1) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
}

.award-icon i {
    font-size: 24px;
    color: var(--accent);
}

.award-card h3 {
    font-size: 18px;
    margin-bottom: 4px;
}

.award-card p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.award-card span {
    font-size: 12px;
    color: var(--text-muted);
}

.award-card.featured {
    background: linear-gradient(135deg, rgba(255, 215, 0, 0.15) 0%, rgba(255, 165, 0, 0.08) 100%);
    border-color: rgba(255, 215, 0, 0.4);
}

.award-card.featured h3 {
    color: #ffd700;
}

/* Organizations Section */
.org-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.org-card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 28px;
    border: 1px solid var(--border);
    transition: all var(--transition);
}

.org-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-shadow);
}

.org-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: rgba(59, 130, 246, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}

.org-icon i {
    font-size: 20px;
    color: var(--accent);
}

.org-card h3 {
    font-size: 18px;
    margin-bottom: 8px;
}

.org-card p {
    font-size: 14px;
    color: var(--accent);
    margin-bottom: 8px;
}

.org-card span {
    font-size: 13px;
    color: var(--text-secondary);
}

/* ========================================
   Contact Section
   ======================================== */
.contact-content {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.contact-intro {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-bottom: 32px;
}

.contact-card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 24px;
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    transition: all var(--transition);
}

.contact-card:hover {
    border-color: var(--accent);
    transform: translateY(-3px);
}

.contact-card i {
    font-size: 24px;
    color: var(--accent);
}

.contact-label {
    font-size: 12px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.contact-value {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

/* ========================================
   Footer
   ======================================== */
.footer {
    padding: 40px 0;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    position: relative;
    overflow: hidden;
}

/* Footer Decorative Element */
.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 10%;
    width: 0;
    height: 0;
    border-left: 30px solid transparent;
    border-right: 30px solid transparent;
    border-top: 20px solid var(--accent);
    opacity: 0.1;
}

.footer::after {
    content: '';
    position: absolute;
    bottom: 20px;
    right: 10%;
    width: 100px;
    height: 100px;
    border-radius: 50%;
    border: 1px solid var(--accent);
    opacity: 0.08;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

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

.footer-links {
    display: flex;
    gap: 16px;
}

.footer-links a {
    color: var(--text-muted);
    font-size: 18px;
    transition: color var(--transition);
}

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

.copyright {
    text-align: center;
    font-size: 13px;
    color: var(--text-muted);
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-description {
        max-width: 100%;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .hero-links {
        justify-content: center;
    }
    
    .hero-visual {
        display: none;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .research-grid {
        grid-template-columns: 1fr;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .project-card.featured {
        grid-column: span 1;
    }
    
    .skills-container {
        grid-template-columns: 1fr;
    }
    
    .awards-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .org-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-center,
    .btn-hire {
        display: none;
    }
    
    .mobile-toggle {
        display: flex;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero-title {
        flex-direction: column;
        gap: 4px;
    }
    
    .hero-title .separator {
        display: none;
    }
    
    .section {
        padding: 60px 0;
    }
    
    .experience-timeline {
        padding-left: 0;
    }
    
    .experience-timeline::before {
        display: none;
    }
    
    .exp-timeline-dot {
        display: none;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .awards-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 16px;
    }
}

@media (max-width: 480px) {
    .hero-stats {
        flex-direction: column;
        gap: 16px;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
}