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

:root {
    /* Color Palette — Restrained, muted, one accent used with purpose */
    --color-bg: #FAFAF8;
    --color-text-primary: #1A1A1A;
    --color-text-secondary: #6B6B6B;
    --color-surface: #F2F1EE;
    --color-accent: #2B6B5E;
    --color-accent-hover: #23584D;
    --color-accent-light: #EDF4F2;
    --color-border: #E5E4E0;

    /* Typography */
    --font-sans: 'General Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

    /* Type Scale — clamp-based responsive sizing */
    --text-hero: clamp(2.25rem, 4vw, 3rem);
    --text-title: clamp(1.5rem, 2.5vw, 2rem);
    --text-subtitle: clamp(1.125rem, 1.5vw, 1.375rem);
    --text-body: clamp(1rem, 1.2vw, 1.125rem);
    --text-caption: clamp(0.8125rem, 1vw, 0.875rem);
    --text-nav: 0.9375rem;

    /* Spacing — 8px base unit */
    --space-xs: 0.5rem;    /* 8px */
    --space-sm: 1rem;      /* 16px */
    --space-md: 1.5rem;    /* 24px */
    --space-lg: 2.5rem;    /* 40px */
    --space-xl: 5rem;      /* 80px */
    --space-2xl: 7.5rem;   /* 120px */

    /* Layout */
    --max-width: 70rem;        /* 1120px */
    --content-width: 42rem;    /* 672px — classic reading measure */
}

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

/* Typography — Clear hierarchy, sentence case, no all-caps */
h1, h2, h3, h4, h5, h6 {
    color: var(--color-text-primary);
    line-height: 1.2;
    margin-bottom: var(--space-sm);
}

h1 {
    font-size: var(--text-hero);
    font-weight: 600;
    letter-spacing: -0.01em;
    line-height: 1.2;
}

h2 {
    font-size: var(--text-title);
    font-weight: 500;
    letter-spacing: -0.01em;
    line-height: 1.2;
}

h3 {
    font-size: var(--text-subtitle);
    font-weight: 600;
    line-height: 1.3;
}

p {
    margin-bottom: 1.5em;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color 150ms ease;
}

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

strong {
    font-weight: 600;
    color: var(--color-text-primary);
}

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

.content {
    max-width: var(--content-width);
}

/* Navigation — Minimal, name left, links right */
.nav {
    padding: var(--space-md) 0;
    position: sticky;
    top: 0;
    background: var(--color-bg);
    z-index: 100;
    border-bottom: 1px solid var(--color-border);
}

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

.nav-name {
    font-size: var(--text-nav);
    font-weight: 600;
    color: var(--color-text-primary);
    text-decoration: none;
}

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

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    color: var(--color-text-secondary);
    font-size: var(--text-nav);
    font-weight: 500;
    transition: color 150ms ease;
}

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

.nav-links a.active {
    color: var(--color-accent);
}

/* Mobile nav toggle — text label, not hamburger */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-xs);
    font-family: var(--font-sans);
    font-size: var(--text-nav);
    font-weight: 500;
    color: var(--color-text-primary);
}

/* Hero Section */
.hero {
    padding: var(--space-2xl) 0 var(--space-xl);
}

.hero-name {
    font-size: var(--text-hero);
    font-weight: 600;
    letter-spacing: -0.01em;
    line-height: 1.2;
    color: var(--color-text-primary);
    margin-bottom: var(--space-md);
}

.hero-headline {
    font-size: var(--text-subtitle);
    font-weight: 400;
    color: var(--color-text-primary);
    max-width: var(--content-width);
    margin-bottom: var(--space-md);
    line-height: 1.6;
}

.hero-meta {
    font-size: var(--text-caption);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-md);
    line-height: 1.4;
}

.hero-meta span {
    display: inline;
}

.hero-meta span + span::before {
    content: " · ";
}

.hero-links {
    display: flex;
    gap: var(--space-sm);
}

.hero-links a {
    font-size: var(--text-caption);
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: color 150ms ease;
}

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

/* Case Studies List — Stacked vertically, generous spacing */
.case-studies-section {
    padding: var(--space-xl) 0 var(--space-2xl);
}

.case-studies-section > .container > h2 {
    margin-bottom: var(--space-xl);
}

.case-studies-list {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.case-study-entry {
    padding: var(--space-lg) 0;
    border-top: 1px solid var(--color-border);
    display: block;
    text-decoration: none;
    transition: background 0.15s ease;
}

.case-study-entry:last-child {
    border-bottom: 1px solid var(--color-border);
}

.case-study-entry:hover {
    color: inherit;
}

.case-study-entry-inner {
    max-width: var(--content-width);
}

.case-study-year {
    font-size: var(--text-caption);
    color: var(--color-text-secondary);
    font-weight: 500;
    margin-bottom: var(--space-xs);
    display: block;
    line-height: 1.4;
}

.case-study-entry h3 {
    font-size: var(--text-subtitle);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: 0.375rem;
    transition: color 150ms ease;
}

.case-study-entry:hover h3 {
    color: var(--color-accent);
}

.case-study-entry p {
    font-size: var(--text-body);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-sm);
    line-height: 1.6;
}

.case-study-arrow {
    font-size: var(--text-caption);
    color: var(--color-accent);
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
}

.case-study-arrow::after {
    content: "→";
    transition: transform 0.15s ease;
}

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

/* Case Study Detail Page */
.case-study-header {
    padding: var(--space-xl) 0 var(--space-lg);
}

.case-study-header h1 {
    margin-bottom: var(--space-xs);
}

.case-study-subtitle {
    font-size: var(--text-subtitle);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
    line-height: 1.5;
}

.case-study-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
    padding: var(--space-md) 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.case-study-meta-item {
    font-size: var(--text-caption);
    color: var(--color-text-secondary);
    line-height: 1.4;
}

.case-study-meta-item strong {
    font-weight: 500;
    color: var(--color-text-secondary);
}

/* Case Study Content — Linear narrative */
.case-study-content {
    padding: var(--space-xl) 0 var(--space-2xl);
}

.case-study-content .content > p:first-child {
    font-size: var(--text-subtitle);
    color: var(--color-text-primary);
    line-height: 1.6;
}

.case-study-content h2 {
    margin-top: var(--space-2xl);
    margin-bottom: var(--space-md);
    padding-top: var(--space-lg);
}

.case-study-content h3 {
    margin-top: var(--space-lg);
    margin-bottom: var(--space-sm);
}

.case-study-content p {
    margin-bottom: 1.5em;
    line-height: 1.6;
}

.case-study-content ul {
    margin-bottom: 1.5em;
    padding-left: var(--space-md);
    color: var(--color-text-secondary);
}

.case-study-content li {
    margin-bottom: var(--space-xs);
    line-height: 1.6;
}

/* Key metrics — accent-colored numbers, no borders */
.key-metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--space-lg);
    padding: var(--space-lg) 0;
    margin: var(--space-lg) 0;
}

.key-metric {
    text-align: left;
}

.key-metric-number {
    font-size: var(--text-title);
    font-weight: 600;
    color: var(--color-accent);
    line-height: 1.2;
    margin-bottom: 0.25rem;
}

.key-metric-label {
    font-size: var(--text-caption);
    color: var(--color-text-secondary);
    line-height: 1.4;
}

/* Pull quote / key decision highlight */
.pull-quote {
    margin: var(--space-lg) 0;
    padding-left: var(--space-md);
    border-left: 3px solid var(--color-border);
}

.pull-quote p {
    font-size: var(--text-subtitle);
    color: var(--color-text-primary);
    line-height: 1.6;
    font-weight: 400;
}

/* About Page */
.page-header {
    padding: var(--space-xl) 0 var(--space-lg);
}

.page-header h1 {
    margin-bottom: 0;
}

.about-content {
    padding: var(--space-lg) 0 var(--space-2xl);
}

.about-content p {
    font-size: var(--text-body);
    line-height: 1.6;
    color: var(--color-text-primary);
    margin-bottom: 1.5em;
}

/* Resume Page */
.resume-intro {
    font-size: var(--text-body);
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: var(--space-xl);
    max-width: var(--content-width);
}

.resume-section {
    margin-bottom: var(--space-xl);
}

.resume-section h2 {
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--color-border);
}

.experience-item {
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--color-border);
}

.experience-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
    margin-bottom: 0;
}

.experience-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 0.25rem;
    flex-wrap: wrap;
    gap: var(--space-xs);
}

.experience-title {
    font-size: var(--text-subtitle);
    font-weight: 600;
    color: var(--color-text-primary);
}

.experience-date {
    font-size: var(--text-caption);
    color: var(--color-text-secondary);
    font-weight: 500;
}

.experience-company {
    font-size: var(--text-nav);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-sm);
}

.experience-description {
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: 0;
}

.skills-list {
    color: var(--color-text-secondary);
    line-height: 1.8;
}

/* Contact Page */
.contact-section {
    padding: var(--space-xl) 0 var(--space-2xl);
}

.contact-section h1 {
    margin-bottom: var(--space-md);
}

.contact-section > .container > .content > p {
    font-size: var(--text-body);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
}

.contact-email {
    font-size: var(--text-subtitle);
    font-weight: 600;
    color: var(--color-accent);
    display: inline-block;
    margin-bottom: var(--space-lg);
}

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

.contact-links {
    display: flex;
    gap: var(--space-sm);
}

.contact-links a {
    font-size: var(--text-caption);
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: color 150ms ease;
}

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

/* Footer — Minimal */
.footer {
    border-top: 1px solid var(--color-border);
    padding: var(--space-lg) 0;
    margin-top: var(--space-2xl);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.footer-links {
    display: flex;
    gap: var(--space-md);
    list-style: none;
}

.footer-links a {
    color: var(--color-text-secondary);
    font-size: var(--text-caption);
    font-weight: 500;
}

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

.footer-social {
    display: flex;
    gap: var(--space-sm);
}

.footer-social a {
    color: var(--color-text-secondary);
    font-size: var(--text-caption);
    font-weight: 500;
}

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

/* Responsive */
@media (max-width: 768px) {
    .hero {
        padding: var(--space-xl) 0 var(--space-lg);
    }

    .case-studies-section {
        padding: var(--space-lg) 0 var(--space-xl);
    }

    .case-study-header {
        padding: var(--space-lg) 0 var(--space-md);
    }

    .case-study-content h2 {
        margin-top: var(--space-xl);
    }

    .case-study-meta {
        flex-direction: column;
        gap: var(--space-xs);
    }

    .key-metrics {
        grid-template-columns: 1fr 1fr;
    }

    .experience-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .page-header {
        padding: var(--space-lg) 0 var(--space-md);
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-sm);
    }

    .hero-links {
        flex-direction: column;
    }

    .nav-links {
        display: none;
    }

    .nav-links.open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-bg);
        border-bottom: 1px solid var(--color-border);
        padding: var(--space-sm) var(--space-md);
        gap: var(--space-sm);
    }

    .nav-toggle {
        display: block;
    }

    .key-metrics {
        grid-template-columns: 1fr;
    }

    .contact-links {
        flex-direction: column;
    }
}