:root {
    --color-primary: #FDDD37;
    --color-primary-dark: #E5C730;
    --color-primary-light: #FFF4B8;

    --color-black: #0B0C0C;
    --color-dark: #1D1D1B;
    --color-text: #505A5F;
    --color-text-secondary: #626A6E;
    --color-border: #B1B4B6;
    --color-border-light: #E5E5E5;
    --color-background: #FFFFFF;
    --color-background-alt: #F8F8F8;

    --color-on-primary: #0B0C0C;

    --font-family: 'Source Sans 3', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-base: 19px;
    --font-size-sm: 16px;
    --font-size-xs: 14px;
    --font-size-lg: 24px;
    --font-size-xl: 32px;
    --font-size-2xl: 48px;
    --font-size-3xl: 64px;
    --line-height-base: 1.5;
    --line-height-tight: 1.2;

    --space-xs: 8px;
    --space-sm: 16px;
    --space-md: 24px;
    --space-lg: 40px;
    --space-xl: 64px;
    --space-2xl: 96px;

    --container-width: 1140px;
    --container-narrow: 720px;

    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --color-primary-light: #3D3A1F;
        --color-black: #FFFFFF;
        --color-dark: #F5F5F5;
        --color-text: #B8C0C8;
        --color-text-secondary: #8A9199;
        --color-border: #3A3F44;
        --color-border-light: #2A2E32;
        --color-background: #0D1117;
        --color-background-alt: #161B22;
    }
}

[data-theme="dark"] {
    --color-primary-light: #3D3A1F;
    --color-black: #FFFFFF;
    --color-dark: #F5F5F5;
    --color-text: #B8C0C8;
    --color-text-secondary: #8A9199;
    --color-border: #3A3F44;
    --color-border-light: #2A2E32;
    --color-background: #0D1117;
    --color-background-alt: #161B22;
}

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: 1rem;
    line-height: var(--line-height-base);
    color: var(--color-text);
    background-color: var(--color-background);
}

h1, h2, h3, h4, h5, h6 {
    color: var(--color-black);
    font-weight: 700;
    line-height: var(--line-height-tight);
}

a {
    color: var(--color-black);
    text-decoration: underline;
    text-decoration-thickness: max(1px, 0.0625rem);
    text-underline-offset: 0.15em;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-text-secondary);
    text-decoration-thickness: max(3px, 0.1875rem);
}

a:focus,
button:focus,
input:focus,
select:focus,
textarea:focus,
[tabindex]:focus {
    outline: 3px solid var(--color-primary);
    outline-offset: 0;
    background-color: var(--color-primary);
    color: var(--color-black);
    text-decoration: none;
}

a:focus:not(:focus-visible),
button:focus:not(:focus-visible) {
    outline: none;
    background-color: transparent;
}

.nav-cta:focus:not(:focus-visible) {
    background-color: var(--color-primary);
}

a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 0;
    background-color: var(--color-primary);
    color: var(--color-black);
}

p {
    margin-bottom: 1em;
}

p:last-child {
    margin-bottom: 0;
}

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

ul, ol {
    padding-left: 1.25em;
}

li {
    margin-bottom: 0.5em;
}

.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.section {
    padding: var(--space-2xl) 0;
}

.section-grid {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: var(--space-xl);
}

.section-header {
    position: relative;
}

.section-number {
    display: block;
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--color-primary);
    letter-spacing: 0.1em;
    margin-bottom: var(--space-xs);
}

.section-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-black);
    margin: 0;
}

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

.lead {
    font-size: var(--font-size-lg);
    font-weight: 400;
    color: var(--color-black);
    line-height: 1.4;
    margin-bottom: var(--space-md);
}

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: var(--color-background);
    border-bottom: 1px solid var(--color-border-light);
}

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

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo img {
    height: 45px;
    width: auto;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    list-style: none;
    padding: 0;
    margin: 0;
    margin-top: 5px;
    margin-left: auto;
}

.nav-links a {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text);
    text-decoration: none;
    padding: var(--space-xs) 0;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 3px;
    background: var(--color-primary);
    transition: width var(--transition-base);
}

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

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

.nav-cta {
    background: var(--color-primary);
    color: var(--color-on-primary) !important;
    padding: var(--space-xs) var(--space-sm) !important;
    font-weight: 700;
}

.nav-cta:hover {
    background: var(--color-primary-dark);
}

.nav-cta::after {
    display: none !important;
}

.theme-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    padding: var(--space-xs) var(--space-xs);
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    cursor: pointer;
    color: var(--color-text);
    transition: all var(--transition-fast);
    margin-left: var(--space-sm);
}

.js-enabled .theme-toggle {
    display: flex;
}

.theme-toggle:hover {
    border-color: var(--color-black);
    color: var(--color-black);
}

.theme-icon {
    transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.theme-icon-light {
    display: block;
}

.theme-icon-dark {
    display: none;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .theme-icon-light {
        display: none;
    }
    :root:not([data-theme="light"]) .theme-icon-dark {
        display: block;
    }
}

[data-theme="dark"] .theme-icon-light {
    display: none;
}

[data-theme="dark"] .theme-icon-dark {
    display: block;
}

[data-theme="light"] .theme-icon-light {
    display: block;
}

[data-theme="light"] .theme-icon-dark {
    display: none;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
}

.mobile-menu-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--color-black);
    transition: var(--transition-base);
    transform-origin: center;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: var(--space-2xl) var(--space-md);
    padding-top: calc(var(--space-2xl) + 70px);
    position: relative;
    background: var(--color-background);
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: linear-gradient(135deg, var(--color-primary-light) 0%, transparent 60%);
    opacity: 0.5;
    pointer-events: none;
}

.hero-content {
    max-width: var(--container-width);
    margin: 0 auto;
    width: 100%;
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: center;
}

.hero-graphic {
    display: flex;
    justify-content: flex-end;
}

.hero-badge {
    display: inline-block;
    font-size: var(--font-size-xs);
    font-weight: 700;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-on-primary);
    background: var(--color-primary);
    padding: var(--space-xs) var(--space-sm);
    margin-bottom: var(--space-md);
}

.hero-title {
    font-size: clamp(48px, 8vw, var(--font-size-3xl));
    font-weight: 700;
    line-height: 1.1;
    color: var(--color-black);
    margin-bottom: var(--space-md);
}

.hero-title .line {
    display: block;
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text);
    max-width: 600px;
    margin-bottom: var(--space-lg);
    line-height: 1.5;
}

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

.hero-credentials {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
    margin-top: var(--space-lg);
    list-style: none;
    padding: 0;
}

.credential-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: 0;
    font-size: var(--font-size-xs);
    color: var(--color-text);
    transition: var(--transition-base);
}

.credential-badge:hover {
    border-color: var(--color-primary);
    background: rgba(253, 221, 55, 0.1);
}

.credential-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 16px;
    height: 16px;
    background: var(--color-primary);
    color: var(--color-on-primary);
    border-radius: 50%;
    font-size: 10px;
    font-weight: 700;
}

.hero-scroll-indicator {
    position: absolute;
    bottom: var(--space-lg);
    left: var(--space-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
}

.hero-scroll-indicator span {
    font-size: var(--font-size-xs);
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-text-secondary);
    writing-mode: vertical-rl;
}

.scroll-line {
    width: 1px;
    height: 60px;
    background: var(--color-border);
    position: relative;
    overflow: hidden;
}

.scroll-line::after {
    content: '';
    position: absolute;
    top: -100%;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--color-primary);
    animation: scrollLine 2s ease-in-out infinite;
}

@keyframes scrollLine {
    0% { top: -100%; }
    50% { top: 100%; }
    100% { top: 100%; }
}

.network-graph {
    width: 400px;
    height: 400px;
}

.network-line {
    stroke: var(--color-border);
    stroke-width: 1.5;
    stroke-dasharray: 200;
    stroke-dashoffset: 200;
    animation: lineDrawIn 0.8s ease forwards;
    animation-delay: calc(var(--delay) * 1s);
}

.network-node {
    fill: var(--color-text-secondary);
    opacity: 0;
    animation: nodePopIn 0.4s ease forwards;
    animation-delay: calc(0.3s + var(--delay) * 1s);
}

.network-node-primary {
    fill: var(--color-primary);
    opacity: 0;
    animation: nodePopIn 0.4s ease forwards, nodePulse 3s ease-in-out infinite;
    animation-delay: calc(0.3s + var(--delay) * 1s), 2s;
}

@keyframes lineDrawIn {
    to {
        stroke-dashoffset: 0;
    }
}

@keyframes nodePopIn {
    from {
        opacity: 0;
        transform: scale(0);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes nodePulse {
    0%, 100% {
        filter: drop-shadow(0 0 0 rgba(253, 221, 55, 0.4));
        transform: scale(1);
    }
    50% {
        filter: drop-shadow(0 0 8px rgba(253, 221, 55, 0.6));
        transform: scale(1.1);
    }
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    font-weight: 700;
    text-decoration: none;
    padding: 14px var(--space-md);
    border: 3px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-on-primary);
    border-color: var(--color-primary);
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: var(--color-on-primary);
}

.btn-secondary {
    background: transparent;
    color: var(--color-black);
    border-color: var(--color-black);
}

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

.about {
    background: var(--color-background);
}

.about-values {
    display: flex;
    gap: var(--space-lg);
    margin-top: var(--space-lg);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border-light);
}

.value-item {
    display: flex;
    flex-direction: column;
}

.value-number {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-black);
    line-height: 1;
    margin-bottom: var(--space-xs);
}

.value-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.experience {
    background: var(--color-background-alt);
}

.timeline {
    position: relative;
    padding-left: var(--space-lg);
}

.timeline::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 0;
    width: 2px;
    height: calc(100% - 16px);
    background: var(--color-border-light);
}

.timeline-item {
    position: relative;
    padding-bottom: var(--space-xl);
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-marker {
    position: absolute;
    left: calc(-1 * var(--space-lg));
    top: 8px;
    width: 12px;
    height: 12px;
    background: var(--color-background-alt);
    border: 3px solid var(--color-primary);
    border-radius: 50%;
    transform: translateX(-5px);
}

.timeline-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-xs);
}

.timeline-date {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
}

.timeline-tag {
    font-size: var(--font-size-xs);
    font-weight: 700;
    color: var(--color-on-primary);
    background: var(--color-primary);
    padding: 2px var(--space-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.timeline-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-black);
    margin-bottom: 4px;
}

.timeline-org {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-sm);
}

.timeline-desc {
    color: var(--color-text);
    margin-bottom: var(--space-sm);
}

.timeline-highlights {
    list-style: none;
    padding: 0;
}

.timeline-highlights li {
    position: relative;
    padding-left: var(--space-md);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xs);
}

.timeline-highlights li::before {
    content: '—';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: 700;
}

.skills {
    background: var(--color-background);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
}

.skill-category {
    padding: var(--space-md);
    border: 1px solid var(--color-border-light);
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.skill-category:hover {
    border-color: var(--color-primary);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.05);
}

.skill-category-title {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: var(--font-size-base);
    font-weight: 700;
    color: var(--color-black);
    margin-bottom: var(--space-sm);
}

.skill-icon {
    color: var(--color-primary);
    font-size: var(--font-size-xs);
}

.skill-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.skill-list li {
    font-size: var(--font-size-sm);
    color: var(--color-text);
    padding: var(--space-xs) 0;
    border-bottom: 1px solid var(--color-border-light);
    margin: 0;
}

.skill-list li:last-child {
    border-bottom: none;
}

.contact {
    background: var(--color-background-alt);
}

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

.contact-method {
    display: flex;
    flex-direction: column;
    padding: var(--space-md);
    background: var(--color-background);
    border: 1px solid var(--color-border-light);
    text-decoration: none;
    transition: all var(--transition-base);
}

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

.contact-method-label {
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 4px;
}

.contact-method-value {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-black);
}

.contact-note {
    padding: var(--space-md);
    background: var(--color-primary-light);
    border-left: 4px solid var(--color-primary);
}

.contact-note p {
    font-size: var(--font-size-sm);
    color: var(--color-black);
    margin: 0;
}

.pgp-note {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    margin-top: var(--space-xs);
    margin-bottom: var(--space-lg);
}

.pgp-note a {
    color: var(--color-text-secondary);
}

.site-footer {
    background: #0B0C0C;
    padding: var(--space-lg) 0;
}

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

.footer-brand {
    display: none;
}

.footer-legal {
    font-size: var(--font-size-xs);
    color: rgba(255, 255, 255, 0.6);
    text-align: center;
    margin: 0;
    line-height: 1.6;
}

/*
   Content is visible by default.
   JavaScript adds 'js-enabled' class to body, enabling animations.
   This ensures content is accessible without JavaScript.
*/

.animate-in,
.fade-in {
    opacity: 1;
    transform: none;
}

.js-enabled .animate-in {
    opacity: 0;
    transform: translateY(20px);
    animation: animateIn 0.6s ease forwards;
}

.js-enabled .delay-1 { animation-delay: 0.1s; }
.js-enabled .delay-2 { animation-delay: 0.2s; }
.js-enabled .delay-3 { animation-delay: 0.3s; }
.js-enabled .delay-4 { animation-delay: 0.5s; }

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

.js-enabled .fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.js-enabled .fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.js-enabled .fade-in:nth-child(2) { transition-delay: 0.1s; }
.js-enabled .fade-in:nth-child(3) { transition-delay: 0.2s; }
.js-enabled .fade-in:nth-child(4) { transition-delay: 0.3s; }

/* --------------------------------------------------------------------------
   Reduced Motion (Accessibility)
   Respects user preference to reduce motion
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    .animate-in,
    .js-enabled .animate-in,
    .fade-in,
    .js-enabled .fade-in {
        opacity: 1;
        transform: none;
        animation: none;
        transition: none;
    }

    .scroll-line::after {
        animation: none;
    }

    .network-line,
    .network-node,
    .network-node-primary {
        animation: none;
        opacity: 1;
        stroke-dashoffset: 0;
    }
}

@media (max-width: 1024px) {
    .section-grid {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }

    .section-header {
        display: flex;
        align-items: baseline;
        gap: var(--space-sm);
    }

    .section-number {
        margin-bottom: 0;
    }
}

@media (max-width: 768px) {
    :root {
        --font-size-base: 17px;
    }

    .nav-container {
        padding-left: var(--space-md);
    }

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

    /* Nav visible by default without JS */
    .nav-links {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--color-background);
        border-bottom: 1px solid var(--color-border-light);
        padding: var(--space-md);
        gap: 0;
    }

    /* When JS is enabled, hide nav by default and show toggle */
    .js-enabled .nav-links {
        display: none;
    }

    .js-enabled .nav-links.active {
        display: flex;
    }

    .nav-links li {
        width: 100%;
    }

    .nav-links a {
        display: block;
        padding: var(--space-sm) 0;
        border-bottom: 1px solid var(--color-border-light);
    }

    .nav-links a::after {
        display: none;
    }

    .nav-cta {
        margin-top: var(--space-sm);
        text-align: center;
    }

    .mobile-menu-toggle {
        display: none;
    }

    .js-enabled .mobile-menu-toggle {
        display: flex;
    }

    .hero {
        min-height: auto;
        padding-top: calc(var(--space-xl) + 70px);
        padding-bottom: var(--space-xl);
    }

    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

    .hero-graphic {
        justify-content: center;
        order: -1;
    }

    .network-graph {
        width: 280px;
        height: 280px;
    }

    .hero-scroll-indicator {
        display: none;
    }

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

    .hero-actions .btn {
        width: 100%;
    }

    .hero-credentials {
        justify-content: center;
        margin-top: var(--space-md);
    }

    .credential-badge {
        font-size: 12px;
        padding: 4px 8px;
    }

    .about-values {
        flex-wrap: wrap;
        gap: var(--space-md);
    }

    .value-item {
        flex: 1 1 calc(50% - var(--space-sm));
    }

    .skills-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 40px;
    }

    .hero-subtitle br {
        display: none;
    }

    .timeline {
        padding-left: var(--space-md);
    }

    .timeline-marker {
        left: calc(-1 * var(--space-md));
    }
}