:root {
  --paper: oklch(96% 0.015 70); --paper-strong: oklch(91% 0.025 45); --ink: oklch(18% 0.035 18); --muted: oklch(42% 0.035 20);
  --blue: oklch(32% 0.13 20); --skills: oklch(37% 0.075 26); --skills-deep: oklch(29% 0.065 24); --coral: oklch(73% 0.09 28); --lime: oklch(88% 0.045 55); --line: color-mix(in oklch, var(--ink) 22%, transparent);
  --font: "Trebuchet MS", "Gill Sans", sans-serif; --ease: cubic-bezier(.16, 1, .3, 1);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--paper); }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--font); font-size: clamp(1rem, .94rem + .28vw, 1.16rem); line-height: 1.55; }
a { color: inherit; } button { font: inherit; }
:focus-visible { outline: 3px solid var(--blue); outline-offset: 4px; }
.section-nav :focus-visible, .skills :focus-visible, .degree :focus-visible, footer :focus-visible { outline-color: var(--lime); }
[hidden] { display: none !important; }
::selection { background: var(--lime); color: var(--ink); }
.skip-link { position: fixed; top: 1rem; left: 1rem; z-index: 20; transform: translateY(-180%); padding: .75rem 1rem; background: var(--ink); color: var(--paper); }
.skip-link:focus { transform: translateY(0); }
.site-header { display: flex; align-items: center; justify-content: space-between; padding: 1.2rem clamp(1.25rem, 5vw, 5.5rem); border-bottom: 1px solid var(--line); }
.identity { display: flex; align-items: center; gap: .75rem; text-decoration: none; font-size: .8rem; font-weight: 900; letter-spacing: .04em; text-transform: uppercase; }
.identity-mark { display: grid; place-items: center; width: 2.2rem; aspect-ratio: 1; border-radius: 50%; background: var(--blue); color: var(--paper); font-size: .68rem; }
.header-contact { font-size: .82rem; font-weight: 900; text-underline-offset: .35rem; }
.about { padding: clamp(3rem, 6vw, 5.5rem) clamp(1.25rem, 7vw, 8rem) clamp(3.5rem, 7vw, 6rem); }
.section-label { margin: 0; font-size: .72rem; font-weight: 900; letter-spacing: .1em; text-transform: uppercase; }
.about-grid { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(20rem, .65fr); gap: clamp(2.5rem, 6vw, 7rem); align-items: end; margin-top: clamp(1.5rem, 3.5vw, 3rem); }
.about h1 { max-width: 10ch; margin: 0; font-size: clamp(3rem, 6.4vw, 6.5rem); line-height: .84; letter-spacing: -.085em; }
.about h1 span { color: var(--blue); }
.summary { max-width: 40rem; }
.summary p { text-wrap: pretty; }
.summary-lead { font-size: clamp(1.25rem, 1rem + .7vw, 1.7rem); line-height: 1.22; font-weight: 800; letter-spacing: -.025em; }
.summary-actions { display: flex; flex-wrap: wrap; gap: 1.2rem 2rem; align-items: center; margin-top: 2.2rem; }
.primary-action { display: inline-flex; justify-content: space-between; gap: 2rem; min-width: 15rem; padding: 1rem 1.15rem; background: var(--ink); color: var(--paper); text-decoration: none; font-weight: 900; transition: transform .35s var(--ease), background .35s var(--ease); }
.primary-action:hover { transform: translateY(-3px); background: var(--blue); }
.primary-action span, .contact-action span { transition: transform .28s var(--ease); }
.primary-action:hover span, .contact-action:hover span { transform: translate(3px, -3px); }
.quiet-action { font-weight: 900; text-underline-offset: .35rem; }
.proof-rail-section { padding: 1.6rem 0 2rem; border-block: 1px solid var(--line); background: var(--paper-strong); }
.rail-heading { display: flex; justify-content: space-between; align-items: center; padding: 0 clamp(1.25rem, 5vw, 5.5rem) 1rem; }
.rail-heading > p { margin: 0; font-size: .76rem; font-weight: 900; text-transform: uppercase; letter-spacing: .08em; }
.rail-controls { display: flex; gap: .5rem; }
.rail-controls button { width: 2.75rem; color: var(--ink); aspect-ratio: 1; border: 1px solid var(--ink); border-radius: 50%; background: transparent; cursor: pointer; }
.rail-controls button:hover { background: var(--ink); color: var(--paper); }
.proof-rail { display: flex; gap: .9rem; overflow-x: auto; margin: 0 clamp(1.25rem, 5vw, 5.5rem); padding: 0 0 .8rem; scroll-padding-inline: 0; scroll-snap-type: x mandatory; scrollbar-width: thin; overscroll-behavior-inline: contain; }
.proof-badge { position: relative; flex: 0 0 min(78vw, 17rem); min-height: 8.5rem; display: flex; flex-direction: column; justify-content: space-between; gap: 1rem; padding: 1.25rem 1.2rem 1.1rem; border: 1px solid var(--line); border-top: 3px solid var(--blue); border-radius: .75rem; background: var(--paper); scroll-snap-align: start; transition: transform .32s var(--ease), border-color .32s var(--ease), box-shadow .32s var(--ease); }
.proof-badge span { font-size: .72rem; font-weight: 900; letter-spacing: .08em; text-transform: uppercase; color: var(--blue); }
.proof-badge strong { max-width: 16ch; font-size: clamp(1.2rem, 1rem + .6vw, 1.55rem); line-height: 1.15; letter-spacing: -.02em; }
.section-nav { position: sticky; top: 0; z-index: 10; padding: 0; background: var(--ink); color: var(--paper); }
.section-nav-links { display: grid; grid-template-columns: repeat(4, 1fr); padding: 0 clamp(1.25rem, 5vw, 5.5rem); }
.section-nav a { position: relative; display: flex; align-items: center; gap: .7rem; min-height: 44px; padding: 1.1rem 1rem; border-inline-end: 1px solid color-mix(in oklch, var(--paper) 24%, transparent); text-decoration: none; font-size: .82rem; font-weight: 900; }
.section-nav a:first-child { border-inline-start: 1px solid color-mix(in oklch, var(--paper) 24%, transparent); }
.section-nav span, .skills .section-label { color: var(--lime); }
.content-section { padding: clamp(3.5rem, 7vw, 6rem) clamp(1.25rem, 7vw, 8rem); scroll-margin-top: 4.5rem; }
.section-heading { display: grid; grid-template-columns: minmax(9rem, .3fr) 1fr; gap: clamp(1.5rem, 6vw, 6rem); margin-bottom: clamp(2.5rem, 5vw, 5rem); }
.section-heading h2 { max-width: 16ch; margin: 0; font-size: clamp(2.25rem, 4.4vw, 4.75rem); line-height: .92; letter-spacing: -.065em; }
.experience-list { border-top: 1px solid var(--ink); }
.experience-item { display: grid; grid-template-columns: minmax(14rem, .42fr) 1fr; gap: clamp(1.5rem, 5vw, 6rem); padding: clamp(2rem, 3.5vw, 3.5rem) 0; border-bottom: 1px solid var(--ink); }
.experience-meta p { margin: 0 0 .35rem; font-size: .75rem; font-weight: 900; letter-spacing: .06em; text-transform: uppercase; }
.experience-meta p:last-child { color: var(--blue); }
.experience-main h3 { margin: 0 0 1rem; font-size: clamp(1.6rem, 3vw, 3.2rem); line-height: .95; letter-spacing: -.055em; }
.experience-summary { max-width: 45rem; margin: 0 0 1.5rem; font-size: clamp(1.1rem, 1rem + .4vw, 1.35rem); font-weight: 800; }
.experience-main ul { max-width: 52rem; margin: 0; padding: 0; list-style: none; }
.experience-main li { position: relative; padding: .8rem 0 .8rem 1.5rem; border-top: 1px solid var(--line); }
.experience-main li::before { content: "↗"; position: absolute; left: 0; color: var(--blue); font-weight: 900; }
.skills { background: var(--skills); color: var(--paper); }
.technical-evidence { display: grid; grid-template-columns: 1.1fr .9fr; gap: clamp(2.5rem, 6vw, 7rem); margin-top: clamp(3.5rem, 7vw, 6rem); padding-top: clamp(2.5rem, 4vw, 4rem); border-top: 1px solid var(--paper); }
.technical-evidence h3 { max-width: 15ch; margin: 1rem 0 1.25rem; font-size: clamp(2rem, 3.8vw, 4rem); line-height: .9; letter-spacing: -.06em; }
.technical-evidence > div > p:last-child { max-width: 45rem; }
.technical-evidence ul { align-self: end; margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--paper); }
.technical-evidence li { padding: .85rem 0; border-bottom: 1px solid var(--paper); font-weight: 800; }
.education { background: var(--paper-strong); }
.education-layout { display: grid; grid-template-columns: .75fr 1.25fr; gap: clamp(2.5rem, 6vw, 7rem); }
.degree { align-self: start; padding: 2rem; background: var(--ink); color: var(--paper); }
.degree-date { color: var(--lime); font-size: .75rem; font-weight: 900; letter-spacing: .06em; }
.degree h3 { margin: 3.5rem 0 .7rem; font-size: clamp(2.1rem, 3.5vw, 3.6rem); line-height: .88; letter-spacing: -.06em; }
.institution { font-weight: 900; color: var(--coral); }
.achievement-list { border-top: 1px solid var(--ink); }
.achievement-list article { display: grid; grid-template-columns: 3rem 1fr; gap: 1.4rem; padding: 1.6rem 0; border-bottom: 1px solid var(--ink); }
.achievement-list article > span { font-size: .72rem; font-weight: 900; color: var(--blue); }
.achievement-list h3 { margin: 0 0 .5rem; font-size: clamp(1.25rem, 1.8vw, 1.75rem); line-height: 1; letter-spacing: -.035em; }
.achievement-list p { margin: 0; max-width: 45rem; }
.contact { padding: clamp(3.5rem, 8vw, 7rem) clamp(1.25rem, 8vw, 9rem); background: var(--coral); }
.contact h2 { max-width: 14ch; margin: 1.5rem 0; font-size: clamp(2.8rem, 6vw, 6.5rem); line-height: .84; letter-spacing: -.08em; }
.contact h2 span { color: var(--blue); }
.contact > p:not(.section-label) { max-width: 42rem; font-size: clamp(1.15rem, 1rem + .5vw, 1.45rem); }
.contact-action { display: inline-flex; gap: 2rem; margin-top: 2rem; padding: 1rem 1.2rem; background: var(--paper); text-decoration: none; font-weight: 900; }
footer { display: flex; justify-content: space-between; padding: 1.3rem clamp(1.25rem, 5vw, 5.5rem); background: var(--ink); color: var(--paper); font-size: .75rem; font-weight: 900; text-transform: uppercase; letter-spacing: .06em; }
footer p { margin: 0; }
@media (max-width: 850px) {
  .about-grid, .technical-evidence, .education-layout { grid-template-columns: 1fr; }
  .about h1 { max-width: 10ch; }
  .section-nav-links { display: flex; overflow-x: auto; scrollbar-width: none; }
  .section-nav a { flex: 0 0 auto; white-space: nowrap; }
  .section-heading, .experience-item { grid-template-columns: 1fr; }
      .degree h3 { margin-top: 2.5rem; }
}
@media (max-width: 540px) {
  .site-header { padding-block: .9rem; }
  .about h1 { font-size: clamp(2.6rem, 12vw, 4rem); }
  .section-nav-links { padding-inline: 0; }
  .section-nav a { padding-inline: .9rem; }
  .proof-badge { flex-basis: 78vw; }
    footer { display: block; } footer p + p { margin-top: .4rem; }
}

/* Location in page */
.section-nav a[aria-current="location"] { color: var(--lime); }
.section-nav a::after { content: ""; position: absolute; left: 1rem; right: 1rem; bottom: .55rem; height: 2px; background: var(--lime); transform: scaleX(0); transform-origin: left; transition: transform .38s var(--ease); }
.section-nav a[aria-current="location"]::after { transform: scaleX(1); }
.reading-progress { height: 3px; background: color-mix(in oklch, var(--paper) 18%, transparent); }
.reading-progress span { display: block; height: 100%; background: var(--lime); transform: scaleX(0); transform-origin: left; }

/* Orchestrated motion: applied only when JS and the user's motion preference allow it. */
@keyframes hero-arrive {
  from { opacity: 0; transform: translateY(1.4rem); clip-path: inset(0 0 22% 0); }
  to { opacity: 1; transform: none; clip-path: inset(0); }
}
.motion .about > .section-label,
.motion .about h1,
.motion .summary-lead,
.motion .summary > p:not(.summary-lead),
.motion .summary-actions { animation: hero-arrive .74s var(--ease) both; }
.motion .about h1 { animation-delay: .08s; }
.motion .summary-lead { animation-delay: .18s; }
.motion .summary > p:not(.summary-lead) { animation-delay: .26s; }
.motion .summary-actions { animation-delay: .34s; }
.motion [data-reveal] { opacity: 0; transform: translateY(1.35rem); clip-path: inset(0 0 8% 0); transition: opacity .68s var(--ease), transform .68s var(--ease), clip-path .68s var(--ease); }
.motion [data-reveal].is-visible { opacity: 1; transform: none; clip-path: inset(0); }
.motion .experience-item[data-reveal] .experience-main li { opacity: 0; transform: translateX(.7rem); transition: opacity .48s var(--ease), transform .48s var(--ease); }
.motion .experience-item[data-reveal].is-visible .experience-main li { opacity: 1; transform: none; }
.motion .experience-item[data-reveal].is-visible .experience-main li:nth-child(1) { transition-delay: .12s; }
.motion .experience-item[data-reveal].is-visible .experience-main li:nth-child(2) { transition-delay: .18s; }
.motion .experience-item[data-reveal].is-visible .experience-main li:nth-child(3) { transition-delay: .24s; }
.motion .experience-item[data-reveal].is-visible .experience-main li:nth-child(4) { transition-delay: .3s; }
.motion .experience-item[data-reveal].is-visible .experience-main li:nth-child(5) { transition-delay: .36s; }
@keyframes tool-arrive {
  from { opacity: 0; transform: translateY(.85rem); }
  to { opacity: 1; transform: none; }
}
.motion .toolkit[data-reveal]:not(.is-visible) .tool { opacity: 0; transform: translateY(.85rem); }
.motion .toolkit[data-reveal].is-visible .tool { animation: tool-arrive .46s var(--ease) backwards; animation-delay: calc(90ms + var(--stagger, 0) * 42ms); }

/* Project and product delivery */
.lifecycle { margin-top: clamp(3.5rem, 7vw, 6rem); padding-top: clamp(2.5rem, 4vw, 4rem); border-top: 1px solid var(--paper); }
.lifecycle-intro { max-width: 46rem; }
.lifecycle-intro h3 { margin: 1rem 0 1rem; font-size: clamp(2rem, 3.8vw, 4rem); line-height: .95; letter-spacing: -.05em; }
.lifecycle-steps { position: relative; display: grid; grid-template-columns: repeat(5, 1fr); align-items: start; gap: .75rem; margin: 2.5rem 0 0; padding: 0; list-style: none; }
.lifecycle-steps::before { content: ""; position: absolute; top: 2.05rem; left: 1.2rem; right: 1.2rem; height: 1px; background: color-mix(in oklch, var(--paper) 62%, transparent); z-index: 0; }
.lifecycle-step { position: relative; z-index: 1; overflow: hidden; border: 1px solid color-mix(in oklch, var(--skills-deep) 36%, var(--paper)); border-radius: .85rem; background: var(--paper); color: var(--ink); box-shadow: 0 .35rem 0 color-mix(in oklch, var(--skills-deep) 28%, transparent); transition: transform .28s var(--ease), box-shadow .28s var(--ease), background .28s var(--ease); }
.lifecycle-toggle { display: grid; grid-template-columns: auto 1fr auto; grid-template-rows: auto auto; gap: .4rem .7rem; align-items: center; width: 100%; min-height: 44px; padding: 1rem 1rem .65rem; border: 0; background: transparent; color: inherit; text-align: left; cursor: pointer; }
.lifecycle-number { grid-row: 1 / span 2; display: grid; place-items: center; width: 2.15rem; aspect-ratio: 1; border-radius: 50%; background: var(--skills-deep); color: var(--paper); font-size: .7rem; font-weight: 900; letter-spacing: .08em; transition: transform .28s var(--ease), background .28s var(--ease); }
.lifecycle-name { font-size: clamp(1.2rem, 1.05rem + .45vw, 1.55rem); font-weight: 900; line-height: 1; letter-spacing: -.025em; }
.lifecycle-prompt { align-self: end; color: var(--skills-deep); font-size: .67rem; font-weight: 900; letter-spacing: .06em; text-transform: uppercase; }
.lifecycle-icon { grid-column: 3; grid-row: 1 / span 2; position: relative; width: 1.6rem; aspect-ratio: 1; border: 1px solid var(--skills-deep); border-radius: 50%; }
.lifecycle-icon::before, .lifecycle-icon::after { content: ""; position: absolute; top: 50%; left: 50%; width: .62rem; height: 1px; background: var(--skills-deep); transform: translate(-50%, -50%); }
.lifecycle-icon::after { transform: translate(-50%, -50%) rotate(90deg); transition: transform .28s var(--ease); }
.lifecycle-toggle[aria-expanded="true"] .lifecycle-icon::after { transform: translate(-50%, -50%); }
.lifecycle-summary { margin: 0; padding: 0 1rem 1rem; font-size: .92rem; line-height: 1.45; }
.lifecycle-detail { margin: 0 1rem; }
.lifecycle-enhanced .lifecycle-detail { display: grid; grid-template-rows: 0fr; opacity: 0; visibility: hidden; transition: grid-template-rows .38s var(--ease), opacity .24s var(--ease), visibility 0s linear .38s; }
.lifecycle-enhanced .lifecycle-step.is-open .lifecycle-detail { grid-template-rows: 1fr; opacity: 1; visibility: visible; transition: grid-template-rows .42s var(--ease), opacity .28s var(--ease), visibility 0s; }
.lifecycle-example { min-height: 0; overflow: hidden; margin: 0; padding: 0; border-top: 1px solid var(--line); }
.lifecycle-step.is-open .lifecycle-example { padding: .9rem 0 1rem; }
.lifecycle-example span { display: block; margin-bottom: .25rem; color: var(--skills-deep); font-size: .68rem; font-weight: 900; letter-spacing: .08em; text-transform: uppercase; }
.lifecycle-step.is-open { background: var(--paper-strong); box-shadow: 0 .55rem 0 color-mix(in oklch, var(--skills-deep) 36%, transparent); }

@media (max-width: 1100px) {
  .lifecycle-steps { grid-template-columns: repeat(auto-fit, minmax(min(100%, 15rem), 1fr)); }
  .lifecycle-steps::before { display: none; }
}
@media (max-width: 850px) {
  .lifecycle-steps { grid-template-columns: 1fr; }
}

/* Skills toolkit */
.toolkit-bar { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 1rem 2rem; padding-top: 2rem; border-top: 1px solid var(--paper); }
.toolkit-filters { display: flex; flex-wrap: wrap; gap: .6rem; }
.toolkit-filters button { min-height: 44px; padding: .55rem 1.15rem; border: 1px solid var(--paper); border-radius: 999px; background: transparent; color: var(--paper); font-weight: 900; cursor: pointer; transition: background .25s var(--ease), color .25s var(--ease), transform .2s var(--ease); }
.toolkit-filters button:hover { background: color-mix(in oklch, var(--paper) 14%, transparent); }
.toolkit-filters button[aria-pressed="true"] { background: var(--lime); border-color: var(--lime); color: var(--ink); }
.toolkit-count { margin: 0; font-size: .8rem; font-weight: 900; letter-spacing: .06em; text-transform: uppercase; }
.toolkit-hint { display: none; margin: 1.4rem 0 0; }
.js .toolkit-hint { display: block; }
.tool-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 15rem), 1fr)); gap: .75rem; align-items: start; margin: 1.6rem 0 0; padding: 0; list-style: none; }
.tool { border: 1px solid var(--paper); border-radius: 1.1rem; transition: background .25s var(--ease), color .25s var(--ease), transform .28s var(--ease); }
.tool-toggle { display: grid; grid-template-columns: 1fr auto; gap: .35rem 1rem; width: 100%; min-height: 6rem; padding: 1.1rem 1.2rem; border: 0; border-radius: inherit; background: transparent; color: inherit; text-align: left; cursor: default; }
.js .tool-toggle { cursor: pointer; }
.tool-category { grid-column: 1; font-size: .72rem; font-weight: 900; letter-spacing: .08em; text-transform: uppercase; color: var(--lime); }
.tool-name { grid-column: 1; font-size: clamp(1.25rem, 1.1rem + .5vw, 1.6rem); font-weight: 800; line-height: 1.1; letter-spacing: -.02em; }
.tool-icon { display: none; grid-column: 2; grid-row: 1 / span 2; align-self: center; width: 1.9rem; aspect-ratio: 1; border: 1px solid currentColor; border-radius: 50%; position: relative; }
.js .tool-icon { display: block; }
.tool-icon::before, .tool-icon::after { content: ""; position: absolute; inset: 50% auto auto 50%; width: .75rem; height: 2px; background: currentColor; transform: translate(-50%, -50%); }
.tool-icon::after { transform: translate(-50%, -50%) rotate(90deg); transition: transform .25s var(--ease); }
.tool-toggle[aria-expanded="true"] .tool-icon::after { transform: translate(-50%, -50%) rotate(0deg); }
.tool-evidence-shell { display: grid; grid-template-rows: 0fr; opacity: 0; visibility: hidden; transition: grid-template-rows .36s var(--ease), opacity .24s var(--ease), visibility 0s linear .36s; }
.tool.is-open .tool-evidence-shell { grid-template-rows: 1fr; opacity: 1; visibility: visible; transition: grid-template-rows .42s var(--ease), opacity .3s var(--ease), visibility 0s; }
.tool-evidence { min-height: 0; overflow: hidden; margin: 0; padding: 0 1.2rem; max-width: 60ch; }
.tool.is-open .tool-evidence { padding-bottom: 1.2rem; }
.js .tool:hover { background: color-mix(in oklch, var(--paper) 10%, transparent); }
.tool.is-open, .js .tool.is-open:hover { background: var(--paper); color: var(--ink); }
.tool.is-open .tool-category { color: var(--skills-deep); }
.tool.is-open :focus-visible { outline-color: var(--ink); }

@media (hover: hover) and (pointer: fine) {
  .proof-badge:hover { transform: translateY(-5px); border-color: var(--blue); box-shadow: 0 .8rem 2rem color-mix(in oklch, var(--ink) 12%, transparent); }
  .tool:not(.is-open):hover { transform: translateY(-4px); }
  .toolkit-filters button:hover { transform: translateY(-2px); }
  .lifecycle-step:hover { transform: translateY(-4px); box-shadow: 0 .6rem 0 color-mix(in oklch, var(--skills-deep) 38%, transparent); }
  .lifecycle-step:hover .lifecycle-number { transform: rotate(-5deg) scale(1.05); background: var(--blue); }
}
.toolkit-filters button:active, .primary-action:active, .contact-action:active { transform: scale(.98); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-delay: 0ms !important; }
  .motion [data-reveal], .motion .experience-item[data-reveal] .experience-main li, .motion .toolkit[data-reveal] .tool { opacity: 1; transform: none; clip-path: none; }
}