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

:root {
    /* Dark Theme Colors */
    --primary-color: #00d4ff;
    --primary-color-rgb: 0, 212, 255;
    --secondary-color: #ff6b6b;
    --accent-color: #4ecdc4;
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #2a2a2a;
    --text-primary: #ffffff;
    --text-secondary: #b3b3b3;
    --text-muted: #666666;
    --border-color: #333333;
    --gradient-primary: linear-gradient(135deg, #00d4ff 0%, #4ecdc4 100%);
    --gradient-secondary: linear-gradient(135deg, #ff6b6b 0%, #feca57 100%);
    --gradient-dark: linear-gradient(135deg, #1a1a1a 0%, #2a2a2a 100%);
    
    /* Typography */
    --font-primary: 'Inter', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 2.5rem;
    --spacing-3xl: 3rem;
    --spacing-4xl: 4rem;
    --spacing-5xl: 5rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-neon: 0 0 20px rgba(0, 212, 255, 0.3);
    
    /* Transitions */
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #00b8e6;
}

/* Utilities */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-5xl);
}

.section-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    background: var(--gradient-primary);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    position: relative;
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-base);
    font-weight: 600;
    text-decoration: none;
    border-radius: 50px;
    transition: all var(--transition-normal);
    cursor: pointer;
    border: none;
    position: relative;
    overflow: hidden;
}

.btn::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 var(--transition-slow);
}

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

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(0, 212, 255, 0.5);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
    background: var(--primary-color);
    transform: translateY(-2px);
}

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

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(0, 212, 255, 0.5);
}

.btn-download i {
    animation: downloadPulse 2s infinite;
}

@keyframes downloadPulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: all var(--transition-normal);
    border-bottom: 1px solid var(--border-color);
}

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

.nav-logo .logo-text {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    background: var(--gradient-primary);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-xl);
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-normal);
}

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

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

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.nav-toggle .bar {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    transition: all var(--transition-normal);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding: var(--spacing-5xl) 0;
    background: radial-gradient(circle at 20% 80%, rgba(0, 212, 255, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(255, 107, 107, 0.1) 0%, transparent 50%);
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    gap: var(--spacing-5xl);
}

.hero-title {
    font-size: var(--font-size-6xl);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
}

.hero-subtitle {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: var(--spacing-lg);
}

.hero-description {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2xl);
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.hero-social {
    display: flex;
    gap: var(--spacing-md);
}

.social-link {
    width: 50px;
    height: 50px;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    text-decoration: none;
    transition: all var(--transition-normal);
    border: 1px solid var(--border-color);
}

.social-link:hover {
    background: var(--primary-color);
    color: var(--text-primary);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.hero-visual {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
    width: 100%;
    max-width: 100%;
}

.flow-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--text-primary), var(--primary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.flow-subtitle {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: var(--spacing-sm);
    font-weight: 400;
}

.first-principles-flow {
    width: 100%;
    max-width: 450px;
    background: 
        linear-gradient(135deg, var(--bg-secondary) 0%, rgba(255, 255, 255, 0.05) 100%),
        radial-gradient(circle at 20% 20%, rgba(0, 212, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255, 107, 107, 0.1) 0%, transparent 50%);
    border-radius: 25px;
    padding: var(--spacing-lg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 
        0 20px 40px rgba(0, 0, 0, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
    min-height: 400px;
}

/* Gear flow background effect */
.first-principles-flow::before {
    content: '⚙️';
    position: absolute;
    top: -50px;
    left: 50%;
    font-size: 2rem;
    transform: translateX(-50%);
    animation: gearFlow 4s ease-in-out infinite;
    z-index: 1;
    opacity: 0.7;
}

@keyframes gearFlow {
    0% { 
        top: -50px; 
        transform: translateX(-50%) rotate(0deg);
        opacity: 0.3;
    }
    25% {
        transform: translateX(-50%) rotate(90deg);
        opacity: 0.8;
    }
    50% { 
        top: 50%; 
        transform: translateX(-50%) rotate(180deg);
        opacity: 1;
    }
    75% {
        transform: translateX(-50%) rotate(270deg);
        opacity: 0.8;
    }
    100% { 
        top: 100%; 
        transform: translateX(-50%) rotate(360deg);
        opacity: 0.3;
    }
}

/* Central gear chain line */
.first-principles-flow::after {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    width: 4px;
    background: repeating-linear-gradient(
        180deg,
        transparent 0px,
        transparent 15px,
        rgba(0, 212, 255, 0.6) 15px,
        rgba(0, 212, 255, 0.6) 25px,
        transparent 25px,
        transparent 40px
    );
    transform: translateX(-50%);
    z-index: 1;
    animation: gearChain 3s linear infinite;
}

/* Gear connection dots */
.flow-step .data-dot {
    content: '⚙️';
    position: absolute;
    top: 50%;
    left: 50%;
    font-size: 1.2rem;
    transform: translate(-50%, -50%);
    animation: gearSpin 2s linear infinite;
    z-index: 3;
    opacity: 0.8;
}

@keyframes gearSpin {
    0% { 
        transform: translate(-50%, -50%) rotate(0deg);
        opacity: 0.6;
    }
    50% { 
        transform: translate(-50%, -50%) rotate(180deg);
        opacity: 1;
    }
    100% { 
        transform: translate(-50%, -50%) rotate(360deg);
        opacity: 0.6;
    }
}

@keyframes gearChain {
    0% { background-position: 0 0; }
    100% { background-position: 0 40px; }
}

/* Floating gears background */
.first-principles-flow .floating-particles {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: 0;
}

.first-principles-flow .floating-particles::before,
.first-principles-flow .floating-particles::after {
    content: '🔧';
    position: absolute;
    font-size: 1.5rem;
    animation: floatGear 8s ease-in-out infinite;
    opacity: 0.6;
}

.first-principles-flow .floating-particles::before {
    left: 15%;
    animation-delay: 0s;
}

.first-principles-flow .floating-particles::after {
    right: 15%;
    animation-delay: 4s;
}

@keyframes floatGear {
    0%, 100% { 
        top: -20px; 
        opacity: 0; 
        transform: rotate(0deg) scale(0.8);
    }
    25% { 
        opacity: 0.8; 
        transform: rotate(90deg) scale(1);
    }
    50% { 
        opacity: 0.6; 
        transform: rotate(180deg) scale(1.1);
    }
    75% { 
        opacity: 0.8; 
        transform: rotate(270deg) scale(1);
    }
    100% { 
        top: 100%; 
        opacity: 0; 
        transform: rotate(360deg) scale(0.8);
    }
}

.flow-step {
    background: linear-gradient(145deg, var(--bg-tertiary), rgba(255, 255, 255, 0.05));
    border-radius: 20px;
    padding: var(--spacing-md);
    box-shadow: 
        0 10px 30px rgba(0, 0, 0, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    width: 100%;
    max-width: 100%;
    text-align: center;
    position: relative;
    border: 1px solid rgba(255, 255, 255, 0.05);
    overflow: hidden;
    z-index: 2;
}

/* Step entrance animation */
.flow-step {
    animation: stepEntrance 1s ease-out forwards;
    opacity: 0;
    transform: translateY(50px) scale(0.9);
}

.flow-step:nth-child(2) { animation-delay: 0.3s; }
.flow-step:nth-child(4) { animation-delay: 0.6s; }
.flow-step:nth-child(6) { animation-delay: 0.9s; }
.flow-step:nth-child(8) { animation-delay: 1.2s; }

@keyframes stepEntrance {
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.flow-step .particle-effect {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(0, 212, 255, 0.1) 0%, transparent 70%);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.flow-step:hover .particle-effect {
    opacity: 1;
    animation: floatParticles 2s ease-in-out infinite;
}

@keyframes floatParticles {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(10px, -10px) scale(1.1); }
    50% { transform: translate(-5px, 5px) scale(0.9); }
    75% { transform: translate(-10px, -5px) scale(1.05); }
}

.flow-step::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.flow-step:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 
        0 20px 40px rgba(0, 0, 0, 0.15),
        0 0 0 1px rgba(255, 255, 255, 0.1);
}

.flow-step:hover::before {
    transform: scaleX(1);
}

/* Enhanced step icons with pulsing rings */
.step-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
    font-size: 1.5rem;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.step-icon::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    border-radius: 50%;
    background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.step-icon::after {
    content: '';
    position: absolute;
    top: -8px;
    left: -8px;
    right: -8px;
    bottom: -8px;
    border: 2px solid rgba(0, 212, 255, 0.3);
    border-radius: 50%;
    animation: pulseRing 2s ease-in-out infinite;
}

@keyframes pulseRing {
    0% {
        transform: scale(0.8);
        opacity: 1;
    }
    100% {
        transform: scale(1.2);
        opacity: 0;
    }
}

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

.flow-step:hover .step-icon::before {
    opacity: 1;
}

/* Enhanced icon gradients with animation */
.problem-icon {
    background: linear-gradient(135deg, #ff6b6b, #ff8e8e, #ff6b6b);
    color: white;
    animation: glow 2s ease-in-out infinite alternate;
}

.principle-icon {
    background: linear-gradient(135deg, #4ecdc4, #7dd3d8, #4ecdc4);
    color: white;
    animation: glow 2s ease-in-out infinite alternate 0.5s;
}

.action-icon {
    background: linear-gradient(135deg, #ffe66d, #fff2a1, #ffe66d);
    color: #333;
    animation: glow 2s ease-in-out infinite alternate 1s;
}

.result-icon {
    background: linear-gradient(135deg, #51cf66, #8ce99a, #51cf66);
    color: white;
    animation: glow 2s ease-in-out infinite alternate 1.5s;
}

@keyframes glow {
    from { box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15); }
    to { box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15), 0 0 20px rgba(255, 255, 255, 0.3); }
}

.step-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--text-primary), var(--primary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.step-description {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: 1.6;
    font-weight: 400;
}

/* Enhanced arrows with gear flow */
.flow-arrow {
    color: var(--primary-color);
    font-size: 1.5rem;
    opacity: 0.8;
    animation: gearArrowPulse 2s ease-in-out infinite;
    position: relative;
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: center;
    transform: rotate(90deg);
}

.flow-arrow::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 40px;
    height: 40px;
    background: radial-gradient(circle, rgba(var(--primary-color-rgb), 0.1) 0%, transparent 70%);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    animation: ripple 2s ease-in-out infinite;
}

.flow-arrow::after {
    content: '';
    position: absolute;
    width: 2px;
    height: 60px;
    background: linear-gradient(180deg, 
        rgba(0, 212, 255, 0.8) 0%, 
        rgba(0, 212, 255, 0.4) 50%, 
        rgba(0, 212, 255, 0.8) 100%);
    border-radius: 1px;
    animation: flowLinePulse 2s ease-in-out infinite;
}

@keyframes gearArrowPulse {
    0%, 100% { 
        opacity: 0.8; 
        transform: rotate(90deg) scale(1);
    }
    50% { 
        opacity: 1; 
        transform: rotate(90deg) scale(1.1);
    }
}

@keyframes ripple {
    0% {
        transform: translate(-50%, -50%) scale(0.8);
        opacity: 0.8;
    }
    100% {
        transform: translate(-50%, -50%) scale(1.5);
        opacity: 0;
    }
}

@keyframes flowLinePulse {
    0%, 100% { 
        opacity: 0.4; 
        transform: scaleY(0.8);
    }
    50% { 
        opacity: 0.8; 
        transform: scaleY(1.2);
    }
}

.floating-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    width: 100%;
    margin-top: var(--spacing-xl);
}

.stat-card {
    background: var(--bg-secondary);
    padding: var(--spacing-md);
    border-radius: 15px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.stat-card i {
    font-size: var(--font-size-2xl);
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.stat-number {
    display: block;
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

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

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.scroll-arrow {
    width: 2px;
    height: 30px;
    background: var(--primary-color);
    position: relative;
}

.scroll-arrow::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 8px solid var(--primary-color);
}

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

/* About Section */
.about {
    padding: var(--spacing-5xl) 0;
    background: var(--bg-secondary);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-5xl);
    align-items: center;
}

.about-paragraph {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
}

.about-highlights {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.highlight-item {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.highlight-item i {
    font-size: var(--font-size-xl);
    color: var(--primary-color);
    margin-top: var(--spacing-xs);
}

.highlight-item h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.highlight-item p {
    color: var(--text-secondary);
}

.about-image {
    display: flex;
    justify-content: center;
}

.image-container {
    position: relative;
    width: 450px;
    height: 450px;
    max-width: 90%;
    margin: 0 auto;
}

.profile-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
    border: 5px solid var(--primary-color);
    box-shadow: var(--shadow-2xl), 0 0 30px rgba(0, 212, 255, 0.3);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.profile-image:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-2xl), 0 0 40px rgba(0, 212, 255, 0.4);
}

.image-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 212, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.image-container:hover .image-overlay {
    opacity: 1;
}

.tech-icons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.tech-icons i {
    font-size: var(--font-size-3xl);
    color: var(--text-primary);
    text-shadow: var(--shadow-lg);
}

/* Skills Section */
.skills {
    padding: var(--spacing-5xl) 0;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-2xl);
}

.skill-category {
    background: var(--bg-secondary);
    border-radius: 20px;
    padding: var(--spacing-2xl);
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.skill-category:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.category-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.category-header i {
    font-size: var(--font-size-2xl);
    color: var(--primary-color);
}

.category-header h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
}

.skills-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.skill-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.skill-name {
    font-weight: 600;
    color: var(--text-primary);
}

.skill-bar {
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
    position: relative;
}

.skill-progress {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 4px;
    transition: width 1s ease-in-out;
    position: relative;
}

.skill-progress::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* Projects Section */
.projects {
    padding: var(--spacing-5xl) 0;
    background: var(--bg-secondary);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: auto;
    gap: var(--spacing-2xl);
    max-width: 100%;
}

.project-card {
    background: var(--bg-primary);
    border-radius: 20px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
    group: project;
    width: 100%;
    max-width: 100%;
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-2xl);
    border-color: var(--primary-color);
}

.project-image {
    position: relative;
    aspect-ratio: 3/2;
    overflow: hidden;
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    transition: transform var(--transition-slow);
}

.project-card:hover .project-image img {
    transform: scale(1.02);
}

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.project-links {
    display: flex;
    gap: var(--spacing-md);
}

.project-link {
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    text-decoration: none;
    transition: all var(--transition-normal);
}

.project-link:hover {
    transform: scale(1.1);
    background: var(--accent-color);
}

.project-content {
    padding: var(--spacing-xl);
}

.project-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.project-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.tech-tag {
    background: var(--bg-tertiary);
    color: var(--primary-color);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 20px;
    font-size: var(--font-size-sm);
    font-weight: 500;
    border: 1px solid var(--primary-color);
}

.project-metrics {
    display: flex;
    justify-content: space-between;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.metric {
    text-align: center;
}

.metric-value {
    display: block;
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--primary-color);
}

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

/* Experience Section */
.experience {
    padding: var(--spacing-5xl) 0;
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--gradient-primary);
    transform: translateX(-50%);
}

.timeline-item {
    position: relative;
    margin-bottom: var(--spacing-4xl);
    width: 50%;
}

.timeline-item:nth-child(odd) {
    left: 0;
    padding-right: var(--spacing-2xl);
}

.timeline-item:nth-child(even) {
    left: 50%;
    padding-left: var(--spacing-2xl);
}

.timeline-item::before {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    top: 0;
    box-shadow: 0 0 20px var(--primary-color);
}

.timeline-item:nth-child(odd)::before {
    right: -10px;
}

.timeline-item:nth-child(even)::before {
    left: -10px;
}

.timeline-date {
    font-size: var(--font-size-sm);
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.timeline-content {
    background: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: 15px;
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.timeline-content:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.timeline-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.timeline-company {
    font-size: var(--font-size-lg);
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    font-weight: 500;
}

.timeline-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.timeline-achievements {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.achievement {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

/* Contact Section */
.contact {
    padding: var(--spacing-5xl) 0;
    background: var(--bg-secondary);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-5xl);
    align-items: start;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.contact-item {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.contact-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-icon i {
    font-size: var(--font-size-xl);
    color: var(--text-primary);
}

.contact-details h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.contact-details p {
    color: var(--text-secondary);
}

.contact-social {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.contact-form {
    background: var(--bg-primary);
    padding: var(--spacing-2xl);
    border-radius: 20px;
    border: 1px solid var(--border-color);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.form-group {
    position: relative;
    margin-bottom: var(--spacing-lg);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) 0;
    font-size: var(--font-size-base);
    background: transparent;
    border: none;
    border-bottom: 2px solid var(--border-color);
    color: var(--text-primary);
    transition: border-color var(--transition-normal);
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-bottom-color: var(--primary-color);
}

.form-group label {
    position: absolute;
    top: var(--spacing-md);
    left: 0;
    color: var(--text-secondary);
    transition: all var(--transition-normal);
    pointer-events: none;
}

.form-group input:focus + label,
.form-group input:valid + label,
.form-group textarea:focus + label,
.form-group textarea:valid + label {
    top: -10px;
    left: 0;
    font-size: var(--font-size-sm);
    color: var(--primary-color);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* Footer */
.footer {
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-xl) 0;
}

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

.footer-text {
    color: var(--text-secondary);
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-normal);
}

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

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border: none;
    border-radius: 50%;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-normal);
    opacity: 0;
    visibility: hidden;
    z-index: 1000;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-3xl);
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-3xl);
    }
    
    .image-container {
        width: 400px;
        height: 400px;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-3xl);
    }
    
    .timeline::before {
        left: 30px;
    }
    
    .timeline-item {
        width: 100%;
        left: 0 !important;
        padding-left: var(--spacing-4xl);
        padding-right: 0;
    }
    
    .timeline-item::before {
        left: 20px !important;
        right: auto !important;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        flex-direction: column;
        padding: var(--spacing-xl);
        border-top: 1px solid var(--border-color);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-toggle.active .bar:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active .bar:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    .hero-title {
        font-size: var(--font-size-4xl);
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .first-principles-flow {
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
    }
    
    .flow-step {
        max-width: 100%;
        margin-bottom: var(--spacing-md);
        padding: var(--spacing-lg);
    }
    
    .flow-arrow {
        margin: var(--spacing-sm) 0;
        font-size: 1.2rem;
    }
    
    .step-icon {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }
    
    .floating-stats {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-sm);
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
    
    .image-container {
        width: 320px;
        height: 320px;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .section-title {
        font-size: var(--font-size-3xl);
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .image-container {
        width: 280px;
        height: 280px;
    }
}

/* Animation Classes */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease-out;
}

.fade-in.animate {
    opacity: 1;
    transform: translateY(0);
}

.slide-in-left {
    opacity: 0;
    transform: translateX(-50px);
    transition: all 0.6s ease-out;
}

.slide-in-left.animate {
    opacity: 1;
    transform: translateX(0);
}

.slide-in-right {
    opacity: 0;
    transform: translateX(50px);
    transition: all 0.6s ease-out;
}

.slide-in-right.animate {
    opacity: 1;
    transform: translateX(0);
}

.zoom-in {
    opacity: 0;
    transform: scale(0.8);
    transition: all 0.6s ease-out;
}

.zoom-in.animate {
    opacity: 1;
    transform: scale(1);
}

/* Loading Animation */
.loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease-out;
}

.loading.hide {
    opacity: 0;
    pointer-events: none;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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