/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Apple-inspired Color Palette */
    --primary-color: #007AFF;
    --primary-dark: #0056CC;
    --primary-light: #4DA2FF;
    --secondary-color: #5856D6;
    --accent-color: #FF9F0A;
    --success-color: #30D158;
    --warning-color: #FF9F0A;
    --danger-color: #FF3B30;
    
    /* Neutral Colors */
    --background: #FFFFFF;
    --background-secondary: #F2F2F7;
    --background-tertiary: #FFFFFF;
    --surface: #FFFFFF;
    --surface-elevated: #FFFFFF;
    --text-primary: #000000;
    --text-secondary: #6D6D80;
    --text-tertiary: #8E8E93;
    --border: #D1D1D6;
    --border-light: #F2F2F7;
    --separator: #C6C6C8;
    
    /* Dark mode support */
    --text-on-color: #FFFFFF;
    --surface-shadow: rgba(0, 0, 0, 0.1);
    
    /* Gradients - Spaceship inspired */
    --gradient-primary: linear-gradient(135deg, #007AFF 0%, #5856D6 100%);
    --gradient-secondary: linear-gradient(135deg, #FF9F0A 0%, #FF6B35 100%);
    --gradient-success: linear-gradient(135deg, #30D158 0%, #32ADE6 100%);
    --gradient-surface: linear-gradient(135deg, #FFFFFF 0%, #F8F9FA 100%);
    --gradient-hero: linear-gradient(135deg, #F8F9FA 0%, #FFFFFF 100%);
    
    /* Typography - Apple San Francisco inspired */
    --font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', system-ui, sans-serif;
    --font-size-xs: 0.75rem;    /* 12px */
    --font-size-sm: 0.875rem;   /* 14px */
    --font-size-base: 1rem;     /* 16px */
    --font-size-lg: 1.125rem;   /* 18px */
    --font-size-xl: 1.25rem;    /* 20px */
    --font-size-2xl: 1.5rem;    /* 24px */
    --font-size-3xl: 1.875rem;  /* 30px */
    --font-size-4xl: 2.25rem;   /* 36px */
    --font-size-5xl: 3rem;      /* 48px */
    --font-size-6xl: 3.75rem;   /* 60px */
    --font-size-7xl: 4.5rem;    /* 72px */
    
    /* Font weights */
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-heavy: 800;
    
    /* Spacing - Apple's 8pt grid system */
    --space-1: 0.25rem;   /* 4px */
    --space-2: 0.5rem;    /* 8px */
    --space-3: 0.75rem;   /* 12px */
    --space-4: 1rem;      /* 16px */
    --space-5: 1.25rem;   /* 20px */
    --space-6: 1.5rem;    /* 24px */
    --space-8: 2rem;      /* 32px */
    --space-10: 2.5rem;   /* 40px */
    --space-12: 3rem;     /* 48px */
    --space-16: 4rem;     /* 64px */
    --space-20: 5rem;     /* 80px */
    --space-24: 6rem;     /* 96px */
    --space-32: 8rem;     /* 128px */
    
    /* Shadows - Apple design system */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Transitions */
    --transition-fast: 0.15s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition-base: 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition-slow: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition-spring: 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    
    /* Border Radius */
    --radius-xs: 0.25rem;   /* 4px */
    --radius-sm: 0.375rem;  /* 6px */
    --radius-md: 0.5rem;    /* 8px */
    --radius-lg: 0.75rem;   /* 12px */
    --radius-xl: 1rem;      /* 16px */
    --radius-2xl: 1.5rem;   /* 24px */
    --radius-3xl: 2rem;     /* 32px */
    --radius-full: 9999px;
    
    /* Z-index scale */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --background: #000000;
        --background-secondary: #1C1C1E;
        --background-tertiary: #2C2C2E;
        --surface: #1C1C1E;
        --surface-elevated: #2C2C2E;
        --text-primary: #FFFFFF;
        --text-secondary: #AEAEB2;
        --text-tertiary: #8E8E93;
        --border: #38383A;
        --border-light: #2C2C2E;
        --separator: #38383A;
        --surface-shadow: rgba(0, 0, 0, 0.3);
        --gradient-surface: linear-gradient(135deg, #1C1C1E 0%, #2C2C2E 100%);
        --gradient-hero: linear-gradient(135deg, #000000 0%, #1C1C1E 100%);
    }
}

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

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

@media (min-width: 1400px) {
    .container {
        max-width: 1400px;
    }
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-light);
    z-index: var(--z-fixed);
    transition: var(--transition-base);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 4.5rem;
}

.logo {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition-fast);
    letter-spacing: -0.02em;
}

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

.nav-menu {
    display: flex;
    gap: var(--space-8);
    align-items: center;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
    transition: var(--transition-fast);
    position: relative;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
}

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

.nav-link.active {
    color: var(--primary-color);
    background-color: var(--background-secondary);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: var(--space-1);
    padding: var(--space-2);
}

.bar {
    width: 1.5rem;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition-base);
    border-radius: var(--radius-xs);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: var(--space-24) 0 var(--space-20);
    background: var(--gradient-hero);
    position: relative;
    overflow: hidden;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: center;
    position: relative;
    z-index: 2;
}

.hero-content {
    max-width: 600px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-2) var(--space-4);
    background: var(--background-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    margin-bottom: var(--space-6);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--text-secondary);
}

.hero-title {
    font-size: var(--font-size-6xl);
    font-weight: var(--font-weight-bold);
    line-height: 1.1;
    margin-bottom: var(--space-6);
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--text-secondary);
    margin-bottom: var(--space-8);
    line-height: 1.5;
    font-weight: var(--font-weight-normal);
}

.hero-stats {
    display: flex;
    gap: var(--space-8);
    margin-bottom: var(--space-8);
    padding: var(--space-6) 0;
    border-top: 1px solid var(--border-light);
    border-bottom: 1px solid var(--border-light);
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.stat-number {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    color: var(--primary-color);
    line-height: 1;
    margin-bottom: var(--space-1);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: var(--font-weight-medium);
}

.hero-cta {
    display: flex;
    gap: var(--space-4);
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-lg);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-base);
    transition: var(--transition-base);
    border: none;
    cursor: pointer;
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--text-on-color);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary {
    background: var(--surface);
    color: var(--text-primary);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
}

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

/* Hero Visual */
.hero-visual {
    position: relative;
    height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-image-container {
    position: relative;
    z-index: 3;
}

.profile-image {
    position: relative;
    width: 300px;
    height: 300px;
    border-radius: var(--radius-full);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.profile-photo {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-slow);
}

.profile-image:hover .profile-photo {
    transform: scale(1.05);
}

.image-glow {
    position: absolute;
    top: -20px;
    left: -20px;
    right: -20px;
    bottom: -20px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    z-index: -1;
    opacity: 0.2;
    filter: blur(20px);
    animation: glow 3s ease-in-out infinite alternate;
}

@keyframes glow {
    from { opacity: 0.2; transform: scale(1); }
    to { opacity: 0.4; transform: scale(1.05); }
}

/* Floating Shapes - Spaceship inspired */
.floating-shapes {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1;
}

.shape {
    position: absolute;
    border-radius: var(--radius-lg);
    background: var(--gradient-primary);
    animation: float 8s ease-in-out infinite;
    opacity: 0.8;
}

.shape-1 {
    width: 120px;
    height: 120px;
    top: 10%;
    left: 10%;
    animation-delay: 0s;
    background: var(--gradient-primary);
    border-radius: var(--radius-2xl);
}

.shape-2 {
    width: 80px;
    height: 80px;
    top: 70%;
    right: 20%;
    animation-delay: 2s;
    background: var(--gradient-secondary);
    border-radius: var(--radius-full);
}

.shape-3 {
    width: 60px;
    height: 60px;
    bottom: 30%;
    left: 30%;
    animation-delay: 4s;
    background: var(--gradient-success);
    border-radius: var(--radius-lg);
}

.shape-4 {
    width: 100px;
    height: 100px;
    top: 40%;
    right: 5%;
    animation-delay: 1s;
    background: linear-gradient(135deg, #5856D6 0%, #AF52DE 100%);
    border-radius: var(--radius-xl);
}

.shape-5 {
    width: 40px;
    height: 40px;
    top: 20%;
    right: 40%;
    animation-delay: 3s;
    background: var(--gradient-secondary);
    border-radius: var(--radius-md);
}

.shape-6 {
    width: 70px;
    height: 70px;
    bottom: 10%;
    right: 50%;
    animation-delay: 5s;
    background: var(--gradient-success);
    border-radius: var(--radius-full);
}

@keyframes float {
    0%, 100% { 
        transform: translateY(0px) rotate(0deg) scale(1); 
        opacity: 0.8; 
    }
    33% { 
        transform: translateY(-20px) rotate(5deg) scale(1.05); 
        opacity: 0.9; 
    }
    66% { 
        transform: translateY(-10px) rotate(-3deg) scale(0.95); 
        opacity: 0.7; 
    }
}

/* Orbit Animation */
.orbit-container {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 1;
}

.orbit {
    position: absolute;
    border: 1px solid rgba(0, 122, 255, 0.2);
    border-radius: var(--radius-full);
    animation: rotate 20s linear infinite;
}

.orbit-1 {
    width: 400px;
    height: 400px;
    top: -200px;
    left: -200px;
    animation-duration: 30s;
}

.orbit-2 {
    width: 500px;
    height: 500px;
    top: -250px;
    left: -250px;
    animation-duration: 40s;
    animation-direction: reverse;
}

.orbit-3 {
    width: 600px;
    height: 600px;
    top: -300px;
    left: -300px;
    animation-duration: 50s;
}

.orbit-dot {
    position: absolute;
    width: 8px;
    height: 8px;
    background: var(--primary-color);
    border-radius: var(--radius-full);
    top: -4px;
    left: 50%;
    transform: translateX(-50%);
    box-shadow: 0 0 10px var(--primary-color);
}

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

/* Scroll Indicator */
.hero-scroll-indicator {
    position: absolute;
    bottom: var(--space-8);
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.scroll-arrow {
    color: var(--text-secondary);
    animation: bounce 2s infinite;
    cursor: pointer;
    transition: var(--transition-fast);
}

.scroll-arrow:hover {
    color: var(--primary-color);
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

/* Section Styles */
.section-header {
    text-align: center;
    margin-bottom: var(--space-16);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.section-eyebrow {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-3);
}

.section-title {
    font-size: var(--font-size-5xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-4);
    color: var(--text-primary);
    letter-spacing: -0.02em;
    line-height: 1.1;
}

.section-subtitle {
    font-size: var(--font-size-xl);
    color: var(--text-secondary);
    line-height: 1.5;
    font-weight: var(--font-weight-normal);
}

/* About Section */
.about {
    padding: var(--space-24) 0;
    background: var(--background-secondary);
}

.about-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--space-8);
    margin-bottom: var(--space-16);
}

.feature-card {
    background: var(--surface);
    border-radius: var(--radius-2xl);
    padding: var(--space-8);
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
    border: 1px solid var(--border-light);
    position: relative;
    overflow: hidden;
}

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

.feature-card-large {
    grid-row: span 2;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.feature-content {
    flex: 1;
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-6);
    color: var(--text-on-color);
}

.feature-card h3 {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-4);
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--space-4);
}

.feature-list {
    list-style: none;
    padding: 0;
}

.feature-list li {
    padding: var(--space-2) 0;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    position: relative;
    padding-left: var(--space-6);
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: var(--font-weight-bold);
}

.feature-visual {
    margin-top: var(--space-6);
    height: 200px;
    border-radius: var(--radius-lg);
    background: var(--gradient-primary);
    position: relative;
    overflow: hidden;
}

.visual-element {
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
}

.philosophy-section {
    background: var(--surface);
    border-radius: var(--radius-2xl);
    padding: var(--space-12);
    text-align: center;
    margin-top: var(--space-16);
    box-shadow: var(--shadow-lg);
}

.philosophy-content h3 {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin-bottom: var(--space-6);
    line-height: 1.3;
    letter-spacing: -0.02em;
}

.philosophy-content p {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    line-height: 1.6;
    max-width: 800px;
    margin: 0 auto;
}

/* Portfolio Section */
.portfolio {
    padding: var(--space-24) 0;
    background: var(--background);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    grid-template-rows: auto auto;
    gap: var(--space-6);
}

.portfolio-item {
    background: var(--surface);
    border-radius: var(--radius-2xl);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
    border: 1px solid var(--border-light);
}

.portfolio-item:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
}

.portfolio-featured {
    grid-row: span 2;
}

.portfolio-visual {
    position: relative;
    overflow: hidden;
}

.portfolio-image {
    width: 100%;
    height: 250px;
    overflow: hidden;
}

.portfolio-featured .portfolio-image {
    height: 350px;
}

.portfolio-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-slow);
}

.portfolio-item:hover .portfolio-image img {
    transform: scale(1.05);
}

.portfolio-overlay {
    position: absolute;
    top: var(--space-4);
    left: var(--space-4);
    z-index: 2;
}

.portfolio-tech {
    display: flex;
    gap: var(--space-2);
    flex-wrap: wrap;
}

.tech-tag {
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    backdrop-filter: blur(10px);
}

.portfolio-content {
    padding: var(--space-6);
}

.portfolio-content h3 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-3);
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.portfolio-content p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--space-4);
}

.portfolio-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--primary-color);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
    transition: var(--transition-fast);
}

.portfolio-link:hover {
    gap: var(--space-3);
    color: var(--primary-dark);
}

.portfolio-stats {
    display: flex;
    gap: var(--space-4);
    margin-top: var(--space-4);
}

.stat {
    background: var(--background-secondary);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    color: var(--text-secondary);
}

/* Research Section */
.research {
    padding: var(--space-24) 0;
    background: var(--background-secondary);
}

.research-areas {
    display: grid;
    gap: var(--space-8);
}

.research-category {
    background: var(--surface);
    border-radius: var(--radius-2xl);
    padding: var(--space-8);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-light);
    transition: var(--transition-base);
}

.research-category:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.category-header {
    display: flex;
    align-items: flex-start;
    gap: var(--space-4);
    margin-bottom: var(--space-6);
    padding-bottom: var(--space-6);
    border-bottom: 1px solid var(--border-light);
}

.category-icon {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-on-color);
    flex-shrink: 0;
}

.category-header h3 {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin-bottom: var(--space-2);
    letter-spacing: -0.01em;
}

.category-header p {
    color: var(--text-secondary);
    line-height: 1.5;
}

.research-projects {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-6);
}

.project-item {
    background: var(--background-secondary);
    padding: var(--space-6);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    transition: var(--transition-fast);
}

.project-item:hover {
    background: var(--surface);
    border-color: var(--primary-color);
}

.project-item h4 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin-bottom: var(--space-2);
}

.project-item p {
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: var(--space-4);
    font-size: var(--font-size-sm);
}

.project-meta {
    display: flex;
    gap: var(--space-2);
    flex-wrap: wrap;
}

.project-status,
.project-funding,
.project-collaboration,
.project-impact {
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    border: 1px solid;
}

.project-status {
    background: var(--success-color);
    color: var(--text-on-color);
    border-color: var(--success-color);
}

.project-funding {
    background: var(--primary-color);
    color: var(--text-on-color);
    border-color: var(--primary-color);
}

.project-collaboration {
    background: var(--secondary-color);
    color: var(--text-on-color);
    border-color: var(--secondary-color);
}

.project-impact {
    background: var(--accent-color);
    color: var(--text-on-color);
    border-color: var(--accent-color);
}

/* Insights Section */
.insights {
    padding: var(--space-24) 0;
    background: var(--background);
}

.insights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-8);
}

.insight-card {
    background: var(--surface);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-light);
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.insight-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
}

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

.insight-meta {
    margin-bottom: var(--space-4);
}

.insight-meta time {
    font-size: var(--font-size-sm);
    color: var(--primary-color);
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.insight-card h3 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-4);
    color: var(--text-primary);
    letter-spacing: -0.01em;
    line-height: 1.3;
}

.insight-card p {
    color: var(--text-secondary);
    margin-bottom: var(--space-6);
    line-height: 1.6;
}

.insight-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--primary-color);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
    transition: var(--transition-fast);
}

.insight-link:hover {
    gap: var(--space-3);
    color: var(--primary-dark);
}

/* Contact Section */
.contact {
    padding: var(--space-24) 0;
    background: var(--background-secondary);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: center;
}

.contact-info h2 {
    font-size: var(--font-size-5xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-6);
    color: var(--text-primary);
    letter-spacing: -0.02em;
    line-height: 1.1;
}

.contact-info p {
    font-size: var(--font-size-xl);
    color: var(--text-secondary);
    margin-bottom: var(--space-8);
    line-height: 1.6;
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.contact-method {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-6);
    background: var(--surface);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    text-decoration: none;
    color: var(--text-primary);
    transition: var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.contact-method:hover {
    border-color: var(--primary-color);
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

.method-icon {
    width: 50px;
    height: 50px;
    background: var(--background-secondary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
}

.contact-visual {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 400px;
    position: relative;
}

.contact-shapes {
    position: relative;
    width: 300px;
    height: 300px;
}

.contact-shape {
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-3xl);
    animation: pulse 4s ease-in-out infinite;
    position: relative;
    overflow: hidden;
}

.contact-shape::before {
    content: '';
    position: absolute;
    top: 20%;
    left: 20%;
    right: 20%;
    bottom: 20%;
    background: var(--gradient-secondary);
    border-radius: var(--radius-2xl);
    animation: pulse 4s ease-in-out infinite reverse;
}

@keyframes pulse {
    0%, 100% { 
        transform: scale(1) rotate(0deg); 
        opacity: 0.8; 
    }
    50% { 
        transform: scale(1.05) rotate(2deg); 
        opacity: 1; 
    }
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: var(--text-on-color);
    padding: var(--space-16) 0 var(--space-8);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: var(--space-8);
}

.footer-brand .logo {
    color: var(--text-on-color);
    margin-bottom: var(--space-3);
    display: block;
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.7);
    font-size: var(--font-size-sm);
}

.footer-links {
    display: flex;
    gap: var(--space-8);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    transition: var(--transition-fast);
}

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

.footer-bottom {
    padding-top: var(--space-8);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    font-size: var(--font-size-sm);
}

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

.fade-in-up {
    animation: fadeInUp 0.8s var(--transition-spring) forwards;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: var(--space-12);
        text-align: center;
    }
    
    .hero-visual {
        order: -1;
        height: 400px;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .portfolio-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: var(--space-12);
        text-align: center;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero-title {
        font-size: var(--font-size-4xl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-lg);
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--space-4);
        text-align: left;
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .section-title {
        font-size: var(--font-size-3xl);
    }
    
    .section-subtitle {
        font-size: var(--font-size-lg);
    }
    
    .research-projects {
        grid-template-columns: 1fr;
    }
    
    .insights-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        gap: var(--space-6);
        text-align: center;
    }
    
    .footer-links {
        justify-content: center;
    }
    
    .container {
        padding: 0 var(--space-4);
    }
    
    .profile-image {
        width: 250px;
        height: 250px;
    }
    
    .floating-shapes .shape {
        transform: scale(0.7);
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-base);
    }
    
    .section-title {
        font-size: var(--font-size-2xl);
    }
    
    .feature-card,
    .portfolio-item,
    .research-category,
    .insight-card {
        padding: var(--space-6);
    }
    
    .philosophy-section {
        padding: var(--space-8);
    }
    
    .philosophy-content h3 {
        font-size: var(--font-size-2xl);
    }
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Focus styles for accessibility */
.btn:focus,
.nav-link:focus,
.contact-method:focus,
.portfolio-link:focus,
.insight-link:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Selection styles */
::selection {
    background: var(--primary-color);
    color: var(--text-on-color);
}

/* Loading states */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

/* Utility classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-0 { margin-bottom: 0; }
.mb-4 { margin-bottom: var(--space-4); }
.mb-8 { margin-bottom: var(--space-8); }

.mt-0 { margin-top: 0; }
.mt-4 { margin-top: var(--space-4); }
.mt-8 { margin-top: var(--space-8); }

/* About Section */
.about {
    padding: var(--space-20) 0;
    background: var(--surface);
}

.about-grid {
    display: grid;
    gap: var(--space-8);
}

.about-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-8);
}

.about-card {
    padding: var(--space-8);
    background: var(--surface);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    text-align: center;
    transition: var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.about-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.card-icon {
    width: 48px;
    height: 48px;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-4);
    color: white;
}

.about-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--space-3);
    color: var(--text-primary);
}

.about-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Research Section */
.research {
    padding: var(--space-20) 0;
    background: var(--surface-alt);
}

.research-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-8);
}

.research-card {
    background: var(--surface);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
}

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

.research-visual {
    height: 200px;
    background: var(--gradient-primary);
    position: relative;
    overflow: hidden;
}

.research-visual::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
}

.research-content {
    padding: var(--space-6);
}

.research-content h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--space-3);
    color: var(--text-primary);
}

.research-content p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Insights Section */
.insights {
    padding: var(--space-20) 0;
    background: var(--surface);
}

.insights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-8);
}

.insight-card {
    padding: var(--space-6);
    background: var(--surface);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    transition: var(--transition-base);
}

.insight-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.insight-meta {
    margin-bottom: var(--space-3);
}

.insight-meta time {
    font-size: var(--font-size-xs);
    color: var(--primary-color);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.insight-card h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--space-3);
    color: var(--text-primary);
}

.insight-card p {
    color: var(--text-secondary);
    margin-bottom: var(--space-4);
    line-height: 1.6;
}

.insight-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-size-sm);
    transition: var(--transition-fast);
}

.insight-link:hover {
    color: var(--primary-dark);
}

/* Contact Section */
.contact {
    padding: var(--space-20) 0;
    background: var(--surface-alt);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: center;
}

.contact-info h2 {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--space-4);
    color: var(--text-primary);
}

.contact-info p {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--space-8);
    line-height: 1.6;
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.contact-method {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4);
    background: var(--surface);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: var(--text-primary);
    transition: var(--transition-base);
}

.contact-method:hover {
    border-color: var(--primary-color);
    transform: translateX(4px);
}

.method-icon {
    width: 40px;
    height: 40px;
    background: var(--surface-alt);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
}

.contact-visual {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 300px;
}

.contact-shapes {
    position: relative;
    width: 200px;
    height: 200px;
}

.contact-shape {
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-2xl);
    animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1) rotate(0deg); opacity: 0.8; }
    50% { transform: scale(1.1) rotate(5deg); opacity: 1; }
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: white;
    padding: var(--space-16) 0 var(--space-8);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: var(--space-8);
}

.footer-brand .logo {
    color: white;
    margin-bottom: var(--space-2);
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.7);
    font-size: var(--font-size-sm);
}

.footer-links {
    display: flex;
    gap: var(--space-6);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: var(--transition-fast);
}

.footer-links a:hover {
    color: white;
}

.footer-bottom {
    padding-top: var(--space-8);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    font-size: var(--font-size-sm);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        gap: var(--space-8);
        text-align: center;
    }
    
    .hero-title {
        font-size: var(--font-size-4xl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-lg);
    }
    
    .hero-cta {
        justify-content: center;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .research-grid {
        grid-template-columns: 1fr;
    }
    
    .insights-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: var(--space-8);
        text-align: center;
    }
    
    .footer-content {
        flex-direction: column;
        gap: var(--space-6);
        text-align: center;
    }
    
    .footer-links {
        justify-content: center;
    }
    
    .container {
        padding: 0 var(--space-4);
    }
    
    .section-title {
        font-size: var(--font-size-3xl);
    }
    
    .section-subtitle {
        font-size: var(--font-size-lg);
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-base);
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .floating-shapes .shape {
        transform: scale(0.7);
    }
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

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

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* Focus styles for accessibility */
.btn:focus,
.nav-link:focus,
.contact-method:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Selection styles */
::selection {
    background: var(--primary-color);
    color: white;
}