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

:root {
    /* Colours inspired by Sharon's portfolio with professional purple palette - WCAG 2.2 AA compliant */
    --primary-color: #6b21a8; /* Purple - 4.5:1 contrast on white */
    --primary-light: #9333ea; /* Lighter purple for hover states */
    --primary-dark: #581c87; /* Darker purple for active states */
    --secondary-color: #f3f4f6; /* Light grey */
    --accent-color: #be185d; /* Pink/magenta for highlights - better contrast */
    --text-dark: #1e293b;
    --text-medium: #475569;
    --text-light: #64748b;
    --background: #ffffff;
    --background-alt: #f8fafc;
    --border-color: #e2e8f0;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 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;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Layout */
    --max-width: 1200px;
    --border-radius: 0.5rem;
    --border-radius-lg: 1rem;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 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);
}

html {
    scroll-behavior: smooth;
}

/* Respect user's motion preferences for accessibility */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

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

/* Container */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Skip link for accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--primary-color);
    color: white;
    padding: 8px 16px;
    text-decoration: none;
    border-radius: 0 0 4px 4px;
    font-weight: 600;
    z-index: 10000;
    transition: top 0.3s ease;
}

.skip-link:focus {
    top: 0;
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 4rem;
}

.nav-logo {
    font-weight: 600;
    font-size: var(--font-size-lg);
    color: var(--text-dark);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--text-medium);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -0.5rem;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width 0.3s ease;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
    color: var(--text-dark);
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    font-weight: 500;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.section-title {
    font-size: var(--font-size-3xl);
    text-align: center;
    margin-bottom: var(--spacing-sm);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-medium);
    text-align: center;
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.lead {
    font-size: var(--font-size-lg);
    font-weight: 500;
    color: var(--text-medium);
    margin-bottom: var(--spacing-md);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-size: var(--font-size-base);
    font-weight: 500;
    text-decoration: none;
    border-radius: var(--border-radius);
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    white-space: nowrap;
    position: relative;
}

/* Accessible focus styles */
.btn:focus-visible,
.nav-link:focus-visible,
.case-study-link:focus-visible,
*:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Ensure focus is visible for keyboard users */
.btn:focus:not(:focus-visible) {
    outline: none;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    box-shadow: var(--shadow);
}

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

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

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: white;
}

/* Hero Section */
.hero {
    padding: calc(4rem + var(--spacing-3xl)) 0 var(--spacing-3xl);
    background: linear-gradient(135deg, var(--background) 0%, var(--background-alt) 100%);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--spacing-2xl);
    align-items: center;
}

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

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

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

.hero-image {
    flex-shrink: 0;
}

.profile-image {
    width: 280px;
    height: 280px;
    border-radius: 50%;
    object-fit: cover;
    box-shadow: var(--shadow-lg);
    border: 4px solid white;
}

/* Section Styles */
section {
    padding: var(--spacing-3xl) 0;
}

.section-header {
    margin-bottom: var(--spacing-2xl);
    text-align: center;
}

/* About Section */
.about {
    background-color: var(--background-alt);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--spacing-2xl);
    align-items: start;
}

.about-text {
    max-width: 700px;
}

.skills {
    margin-top: var(--spacing-lg);
}

.skills h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
    color: var(--text-dark);
}

.skills-list {
    list-style: none;
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xs);
}

.skills-list li {
    padding: var(--spacing-xs);
    background: white;
    border-radius: var(--border-radius);
    border-left: 3px solid var(--primary-color);
    font-weight: 500;
    color: var(--text-medium);
}

.about-stats {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    min-width: 200px;
}

.stat {
    text-align: center;
    padding: var(--spacing-md);
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
}

.stat-number {
    display: block;
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1;
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--text-medium);
    font-weight: 500;
}

/* Work Section */
.case-studies {
    display: grid;
    gap: var(--spacing-2xl);
}

.case-study {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: var(--spacing-xl);
    padding: var(--spacing-xl);
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.case-study:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.case-study:nth-child(even) {
    grid-template-columns: 1fr 300px;
}

.case-study:nth-child(even) .case-study-image {
    order: 2;
}

.case-study:nth-child(even) .case-study-content {
    order: 1;
}

.case-study-image {
    border-radius: var(--border-radius);
    overflow: hidden;
}

.case-study-image img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.case-study:hover .case-study-image img {
    transform: scale(1.05);
}

.case-study-title {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
    color: var(--text-dark);
}

.case-study-description {
    color: var(--text-medium);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.case-study-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
    list-style: none;
}

.case-study-tags li {
    background: var(--secondary-color);
    color: var(--text-medium);
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.case-study-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    transition: color 0.3s ease;
}

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

.case-study-link::after {
    content: '→';
    transition: transform 0.3s ease;
}

.case-study-link:hover::after {
    transform: translateX(4px);
}

/* Contact Section */
.contact {
    background-color: var(--background-alt);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    max-width: 800px;
    margin: 0 auto;
}

.contact-info {
    display: grid;
    gap: var(--spacing-md);
}

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

.contact-item strong {
    font-weight: 600;
    color: var(--text-dark);
}

.contact-item a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.contact-item a:hover {
    color: var(--primary-dark);
}

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

.contact-cta p {
    color: var(--text-medium);
    line-height: 1.6;
}

/* Footer */
.footer {
    padding: var(--spacing-lg) 0;
    background-color: var(--text-dark);
    color: white;
    text-align: center;
}

.footer p {
    margin: 0;
    font-size: var(--font-size-sm);
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-xl);
    }
    
    .hero-image {
        order: -1;
    }
    
    .profile-image {
        width: 200px;
        height: 200px;
    }
    
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-lg);
    }
    
    .hero-cta {
        justify-content: center;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .about-stats {
        flex-direction: row;
        justify-content: center;
    }
    
    .case-study {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .case-study:nth-child(even) {
        grid-template-columns: 1fr;
    }
    
    .case-study:nth-child(even) .case-study-image,
    .case-study:nth-child(even) .case-study-content {
        order: unset;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .nav-menu {
        gap: var(--spacing-md);
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    section {
        padding: var(--spacing-2xl) 0;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: calc(4rem + var(--spacing-2xl)) 0 var(--spacing-2xl);
    }
    
    .hero-title {
        font-size: var(--font-size-2xl);
    }
    
    .section-title {
        font-size: var(--font-size-2xl);
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 280px;
    }
    
    .about-stats {
        flex-direction: column;
    }
    
    .nav-menu {
        gap: var(--spacing-sm);
    }
    
    .nav-container {
        padding: 0 var(--spacing-sm);
    }
}