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

/* CSS Variables - Apple-inspired Design System */
:root {
    /* Light mode colors */
    --background: hsl(0, 0%, 100%);
    --foreground: hsl(0, 0%, 8%);
    --surface: hsl(0, 0%, 98%);
    --surface-secondary: hsl(0, 0%, 96%);
    --surface-tertiary: hsl(0, 0%, 94%);
    
    /* Text colors */
    --text-primary: hsl(0, 0%, 8%);
    --text-secondary: hsl(0, 0%, 40%);
    --text-tertiary: hsl(0, 0%, 60%);
    
    /* Card colors */
    --card: hsl(0, 0%, 100%);
    --card-border: hsl(0, 0%, 92%);
    
    /* Button colors */
    --button-primary: hsl(0, 0%, 8%);
    --button-primary-foreground: hsl(0, 0%, 100%);
    --button-secondary: hsl(0, 0%, 95%);
    --button-secondary-foreground: hsl(0, 0%, 8%);
    
    /* Accent colors */
    --accent-blue: hsl(213, 94%, 68%);
    --accent-blue-hover: hsl(213, 94%, 58%);
    --green: hsl(142, 76%, 36%);
    --purple: hsl(262, 83%, 58%);
    
    /* Borders */
    --border: hsl(0, 0%, 90%);
    
    /* Gradients */
    --gradient-subtle: linear-gradient(135deg, hsl(0, 0%, 100%), hsl(0, 0%, 98%));
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --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);
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark mode */
@media (prefers-color-scheme: dark) {
    :root {
        --background: hsl(0, 0%, 8%);
        --foreground: hsl(0, 0%, 95%);
        --surface: hsl(0, 0%, 10%);
        --surface-secondary: hsl(0, 0%, 12%);
        --surface-tertiary: hsl(0, 0%, 14%);
        
        --text-primary: hsl(0, 0%, 95%);
        --text-secondary: hsl(0, 0%, 70%);
        --text-tertiary: hsl(0, 0%, 50%);
        
        --card: hsl(0, 0%, 10%);
        --card-border: hsl(0, 0%, 18%);
        
        --button-primary: hsl(0, 0%, 95%);
        --button-primary-foreground: hsl(0, 0%, 8%);
        --button-secondary: hsl(0, 0%, 15%);
        --button-secondary-foreground: hsl(0, 0%, 95%);
        
        --border: hsl(0, 0%, 18%);
        --gradient-subtle: linear-gradient(135deg, hsl(0, 0%, 8%), hsl(0, 0%, 10%));
    }
}

/* Base Typography */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--foreground);
    background-color: var(--background);
    min-height: 100vh;
}

/* Hero Section */
.hero-section {
    position: relative;
    min-height: 100vh;
    background: linear-gradient(to bottom, var(--surface), var(--background));
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: var(--gradient-subtle);
    opacity: 0.5;
}

.hero-container {
    position: relative;
    max-width: 1200px;
    margin: 0 auto;
    padding: 6rem 1.5rem;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3rem;
    width: 100%;
}

@media (min-width: 1024px) {
    .hero-content {
        flex-direction: row;
        gap: 4rem;
    }
    
    .hero-container {
        padding: 8rem 1.5rem;
    }
}

.hero-text {
    flex: 1;
    text-align: center;
}

@media (min-width: 1024px) {
    .hero-text {
        text-align: left;
    }
}

.hero-title {
    font-size: 3rem;
    font-weight: 300;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    line-height: 1.1;
}

@media (min-width: 1024px) {
    .hero-title {
        font-size: 4.5rem;
    }
}

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

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.4;
}

@media (min-width: 1024px) {
    .hero-subtitle {
        font-size: 1.5rem;
    }
}

.hero-buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    justify-content: center;
}

@media (min-width: 640px) {
    .hero-buttons {
        flex-direction: row;
    }
}

@media (min-width: 1024px) {
    .hero-buttons {
        justify-content: flex-start;
    }
}

/* Profile Image */
.hero-image {
    flex-shrink: 0;
}

.image-container {
    position: relative;
}

.image-gradient {
    position: absolute;
    inset: -1rem;
    background: linear-gradient(to right, rgba(59, 130, 246, 0.2), rgba(147, 51, 234, 0.2));
    border-radius: 1.5rem;
    z-index: -1;
    filter: blur(2rem);
}

.profile-image {
    width: 18rem;
    height: 18rem;
    border-radius: 1.5rem;
    object-fit: cover;
    box-shadow: var(--shadow-xl);
}

@media (min-width: 1024px) {
    .profile-image {
        width: 20rem;
        height: 20rem;
    }
}

/* Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    white-space: nowrap;
    border-radius: 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    text-decoration: none;
    min-height: 2.5rem;
    padding: 0.5rem 1rem;
}

.btn:focus-visible {
    outline: 2px solid var(--accent-blue);
    outline-offset: 2px;
}

.btn:disabled {
    pointer-events: none;
    opacity: 0.5;
}

.btn-primary {
    background-color: var(--button-primary);
    color: var(--button-primary-foreground);
    box-shadow: var(--shadow-sm);
    font-size: 1rem;
    padding: 0.75rem 2rem;
    min-height: 2.75rem;
}

.btn-primary:hover {
    background-color: var(--button-primary);
    opacity: 0.9;
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: var(--button-secondary);
    color: var(--button-secondary-foreground);
    border: 1px solid var(--card-border);
    font-size: 1rem;
    padding: 0.75rem 2rem;
    min-height: 2.75rem;
}

.btn-secondary:hover {
    background-color: var(--surface-tertiary);
}

.btn-accent {
    background-color: var(--accent-blue);
    color: white;
    box-shadow: var(--shadow-sm);
    font-size: 1rem;
    padding: 0.75rem 2rem;
    min-height: 2.75rem;
    min-width: 12rem;
}

.btn-accent:hover {
    background-color: var(--accent-blue-hover);
    box-shadow: var(--shadow-lg);
}

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

.btn-ghost:hover {
    background-color: var(--surface-secondary);
}

.btn-icon {
    width: 3rem;
    height: 3rem;
    border-radius: 1rem;
    padding: 0.75rem;
}

.btn svg {
    width: 1.25rem;
    height: 1.25rem;
    flex-shrink: 0;
}

/* Expertise Section */
.expertise-section {
    padding: 5rem 0;
    background-color: var(--surface);
}

.section-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 300;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

@media (min-width: 1024px) {
    .section-title {
        font-size: 3rem;
    }
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 32rem;
    margin: 0 auto;
}

.expertise-grid {
    display: grid;
    gap: 2rem;
}

@media (min-width: 768px) {
    .expertise-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.expertise-card {
    background-color: var(--card);
    border-radius: 1.5rem;
    padding: 2rem;
    border: 1px solid var(--card-border);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.expertise-card:hover {
    box-shadow: var(--shadow-lg);
}

.card-icon {
    width: 4rem;
    height: 4rem;
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.card-icon svg {
    width: 2rem;
    height: 2rem;
}

.card-icon-blue {
    background-color: rgba(59, 130, 246, 0.1);
    color: var(--accent-blue);
}

.card-icon-green {
    background-color: rgba(34, 197, 94, 0.1);
    color: var(--green);
}

.card-icon-purple {
    background-color: rgba(147, 51, 234, 0.1);
    color: var(--purple);
}

.card-title {
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

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

/* Contact Section */
.contact-section {
    padding: 5rem 0;
    background-color: var(--background);
}

.contact-container {
    max-width: 64rem;
    margin: 0 auto;
    padding: 0 1.5rem;
    text-align: center;
}

.contact-title {
    font-size: 2.5rem;
    font-weight: 300;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
}

@media (min-width: 1024px) {
    .contact-title {
        font-size: 3rem;
    }
}

.contact-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    max-width: 32rem;
    margin-left: auto;
    margin-right: auto;
}

.contact-buttons {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    justify-content: center;
    align-items: center;
}

@media (min-width: 640px) {
    .contact-buttons {
        flex-direction: row;
    }
}

.social-buttons {
    display: flex;
    gap: 1rem;
}

/* Footer */
.footer {
    padding: 2rem 0;
    background-color: var(--surface);
    border-top: 1px solid var(--card-border);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    text-align: center;
}

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

/* Responsive Design */
@media (max-width: 640px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .section-title,
    .contact-title {
        font-size: 2rem;
    }
    
    .expertise-card {
        padding: 1.5rem;
    }
}

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

/* Focus Management */
.btn:focus-visible,
a:focus-visible {
    outline: 2px solid var(--accent-blue);
    outline-offset: 2px;
    border-radius: 0.5rem;
}

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