:root {
  --navy: #071425;
  --navy-light: #0d2038;
  --navy-lighter: #173451;
  --slate: #8da0bd;
  --slate-light: #b5c3d8;
  --white: #eaf3ff;
  --green: #5fffd5;
  --green-soft: rgba(95, 255, 213, 0.12);
  --border: rgba(141, 160, 189, 0.18);
  --shadow: 0 25px 60px rgba(0, 0, 0, 0.28);
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--navy);
  color: var(--slate);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  overflow-x: hidden;
}
body.menu-open { overflow: hidden; }
::selection { color: var(--navy); background: var(--green); }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
.skip-link { position: fixed; left: 1rem; top: -4rem; z-index: 1000; padding: .7rem 1rem; color: var(--navy); background: var(--green); }
.skip-link:focus { top: 1rem; }
.page-grid {
  position: fixed; inset: 0; pointer-events: none; z-index: -2; opacity: .34;
  background-image: linear-gradient(rgba(141,160,189,.028) 1px, transparent 1px), linear-gradient(90deg, rgba(141,160,189,.028) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(to bottom, #000 0, transparent 78%);
}
.cursor-glow {
  position: fixed; width: 500px; height: 500px; border-radius: 50%; pointer-events: none; z-index: -1;
  background: radial-gradient(circle, rgba(54, 155, 193, .09), transparent 68%);
  transform: translate(-50%, -50%); transition: opacity .3s ease;
}

.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 100; height: 88px; padding: 0 clamp(1.5rem, 5vw, 4.5rem);
  display: flex; align-items: center; justify-content: space-between;
  background: rgba(7, 20, 37, .82); backdrop-filter: blur(14px); transition: transform .3s ease, box-shadow .3s ease;
}
.site-header.scrolled { box-shadow: 0 10px 30px rgba(0,0,0,.24); height: 76px; }
.site-header.header-hidden { transform: translateY(-100%); }
.brand {
  display: grid; place-items: center; width: 46px; height: 46px; color: var(--green); font: 700 .9rem var(--mono);
  border: 1px solid var(--green); border-radius: 10px; transform: rotate(45deg); transition: background .2s, transform .2s;
}
.brand span { transform: rotate(-45deg); }
.brand:hover, .brand:focus-visible { background: var(--green-soft); transform: rotate(45deg) translate(-2px, -2px); }
.site-nav { display: flex; align-items: center; gap: clamp(1rem, 2.4vw, 2.2rem); font: .78rem var(--mono); color: var(--slate-light); }
.site-nav a { transition: color .2s; }
.site-nav a span { color: var(--green); margin-right: .25rem; }
.site-nav a:hover, .site-nav a:focus-visible { color: var(--green); }
.menu-button { display: none; border: 0; background: transparent; padding: .5rem; }
.menu-button span { display: block; width: 28px; height: 2px; margin: 5px; background: var(--green); transition: .25s; }

.button {
  display: inline-flex; align-items: center; justify-content: center; min-height: 50px; padding: .8rem 1.4rem;
  border: 1px solid var(--green); border-radius: 5px; color: var(--green); background: transparent;
  font: .84rem var(--mono); letter-spacing: .01em; transition: transform .2s, box-shadow .2s, background .2s;
}
.button:hover, .button:focus-visible { transform: translate(-4px, -4px); box-shadow: 4px 4px 0 var(--green); background: var(--green-soft); }
.button-small { min-height: 40px; padding: .55rem .9rem; }
.text-link { color: var(--slate-light); font: .84rem var(--mono); border-bottom: 1px solid transparent; transition: color .2s, border-color .2s; }
.text-link:hover, .text-link:focus-visible { color: var(--green); border-color: var(--green); }

.section-shell { width: min(1100px, calc(100% - 3rem)); margin-inline: auto; }
.hero { min-height: 100vh; padding: 150px 0 90px; display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(330px, .85fr); align-items: center; gap: clamp(3rem, 8vw, 7rem); }
.eyebrow, .section-number, .project-kicker { margin: 0 0 1.2rem; color: var(--green); font: .92rem var(--mono); }
.hero h1, .hero h2 { margin: 0; letter-spacing: -.045em; line-height: 1.05; }
.hero h1 { color: var(--white); font-size: clamp(3.1rem, 7vw, 6.3rem); }
.hero h2 { margin-top: .45rem; color: var(--slate); font-size: clamp(2.25rem, 5vw, 4.8rem); max-width: 850px; }
.hero-description { max-width: 640px; margin: 2rem 0 0; font-size: clamp(1rem, 1.6vw, 1.18rem); }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 1.8rem; margin-top: 2.5rem; }

.portrait-stage { position: relative; aspect-ratio: 1 / 1.05; border: 1px solid var(--border); border-radius: 14px; overflow: hidden; background: radial-gradient(circle at 50% 44%, rgba(95,255,213,.08), transparent 42%), linear-gradient(145deg, rgba(23,52,81,.72), rgba(7,20,37,.46)); box-shadow: var(--shadow); }
.portrait-stage::before { content: ""; position: absolute; inset: 0; background-image: linear-gradient(rgba(95,255,213,.035) 1px, transparent 1px), linear-gradient(90deg, rgba(95,255,213,.035) 1px, transparent 1px); background-size: 30px 30px; pointer-events: none; }
.portrait-topline { position: absolute; z-index: 5; inset: 0 0 auto; height: 43px; padding: 0 .9rem; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--border); color: var(--slate); background: rgba(7,20,37,.6); font: .68rem var(--mono); }
.live { display: flex; align-items: center; gap: .45rem; color: var(--green); }
.live i { width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 12px var(--green); animation: pulse 1.8s infinite; }
.portrait-frame { position: absolute; inset: 43px 0 38px; display: grid; place-items: center; overflow: hidden; }
.portrait-frame::after { content: ""; position: absolute; inset: 7% 7% 3%; border: 1px dashed rgba(95,255,213,.12); border-radius: 50%; pointer-events: none; }
.portrait-photo, .ascii-portrait { position: absolute; width: min(96%, 440px); height: min(96%, 440px); object-fit: cover; object-position: 50% 42%; }
.portrait-photo { opacity: .06; filter: grayscale(1) contrast(1.18) brightness(.7) sepia(.35) hue-rotate(115deg) saturate(1.3); transition: opacity .35s ease, filter .35s ease, transform .35s ease; }
.ascii-portrait { z-index: 2; cursor: crosshair; touch-action: none; opacity: 0; transition: opacity .4s ease; }
.portrait-stage.canvas-ready .ascii-portrait { opacity: 1; }
.portrait-stage.photo-mode .portrait-photo { opacity: 1; filter: none; transform: scale(.96); border-radius: 7px; }
.portrait-stage.photo-mode .ascii-portrait, .portrait-stage.photo-mode .portrait-scan { opacity: 0; pointer-events: none; }
.portrait-scan { position: absolute; z-index: 3; left: 7%; right: 7%; height: 1px; top: 18%; opacity: .55; background: linear-gradient(90deg, transparent, var(--green), transparent); box-shadow: 0 0 14px rgba(95,255,213,.55); animation: scan 5.5s ease-in-out infinite; pointer-events: none; transition: opacity .3s; }
.portrait-controls { position: absolute; z-index: 5; inset: auto 0 0; height: 38px; padding: 0 .9rem; display: flex; align-items: center; justify-content: space-between; border-top: 1px solid var(--border); background: rgba(7,20,37,.75); color: var(--slate); font: .56rem var(--mono); }
.portrait-controls button { padding: .25rem .45rem; border: 0; border-bottom: 1px solid var(--green); color: var(--green); background: transparent; font: inherit; cursor: pointer; }
.portrait-controls button:hover, .portrait-controls button:focus-visible { color: var(--white); }

.metrics { display: grid; grid-template-columns: repeat(4, 1fr); margin-top: -15px; border: 1px solid var(--border); border-radius: 9px; background: rgba(13,32,56,.68); box-shadow: 0 20px 50px rgba(0,0,0,.16); }
.metrics article { padding: 1.6rem 1.4rem; border-right: 1px solid var(--border); }
.metrics article:last-child { border: 0; }
.metrics strong, .metrics article > span { color: var(--white); font: 600 clamp(1.5rem, 3vw, 2.3rem) var(--mono); }
.metrics article > span { color: var(--green); }
.metrics p { margin: .35rem 0 0; font: .7rem var(--mono); }

.content-section { padding-top: 150px; }
.section-heading { display: flex; align-items: center; gap: 1rem; margin-bottom: 3.4rem; }
.section-heading .section-number { margin: .35rem 0 0; }
.section-heading h2 { margin: 0; color: var(--white); font-size: clamp(1.65rem, 3vw, 2.25rem); letter-spacing: -.03em; }
.section-heading > span { width: min(300px, 30vw); height: 1px; margin-left: .4rem; background: var(--border); }
.about-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: clamp(2.5rem, 8vw, 7rem); }
.about-copy p { margin: 0 0 1.25rem; }
.toolkit { border: 1px solid var(--border); border-radius: 9px; background: rgba(13,32,56,.65); overflow: hidden; box-shadow: var(--shadow); }
.toolkit-header { display: flex; justify-content: space-between; padding: .85rem 1rem; color: var(--slate); background: rgba(23,52,81,.5); border-bottom: 1px solid var(--border); font: .66rem var(--mono); }
.tool-group { padding: 1rem 1.15rem; border-bottom: 1px solid var(--border); }
.tool-group:last-child { border: 0; }
.tool-group p { margin: 0 0 .65rem; color: var(--green); font: .68rem var(--mono); }
.tool-group ul, .tech-list { display: flex; flex-wrap: wrap; gap: .55rem; margin: 0; padding: 0; list-style: none; }
.tool-group li, .tech-list li { padding: .25rem .55rem; border: 1px solid var(--border); border-radius: 4px; color: var(--slate-light); background: rgba(7,20,37,.55); font: .62rem var(--mono); }

.experience-layout { display: grid; grid-template-columns: 210px 1fr; min-height: 350px; }
.tab-list { display: flex; flex-direction: column; border-left: 1px solid var(--border); }
.tab-list button { min-height: 58px; padding: .75rem 1.25rem; border: 0; border-left: 2px solid transparent; color: var(--slate); background: transparent; text-align: left; font: .76rem var(--mono); cursor: pointer; transition: color .2s, background .2s, border-color .2s; }
.tab-list button:hover, .tab-list button:focus-visible { color: var(--green); background: var(--green-soft); }
.tab-list button[aria-selected="true"] { color: var(--green); border-left-color: var(--green); background: var(--green-soft); }
.tab-panels { padding: .2rem 0 0 2.8rem; }
.tab-panels h3 { margin: 0; color: var(--white); font-size: 1.25rem; }
.tab-panels h3 span { color: var(--green); }
.date { margin: .4rem 0 1.4rem; font: .72rem var(--mono); }
.tab-panels ul { margin: 0; padding: 0; list-style: none; }
.tab-panels li { position: relative; margin-bottom: .85rem; padding-left: 1.55rem; }
.tab-panels li::before { content: "▹"; position: absolute; left: 0; top: .05rem; color: var(--green); }

.projects-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.2rem; }
.project-card { position: relative; min-height: 380px; padding: 2rem; border: 1px solid var(--border); border-radius: 8px; background: var(--navy-light); box-shadow: 0 18px 40px rgba(0,0,0,.16); overflow: hidden; transition: transform .25s, border-color .25s; }
.project-card:hover { transform: translateY(-7px); border-color: rgba(95,255,213,.45); }
.project-card::after { content: ""; position: absolute; width: 180px; height: 180px; right: -80px; bottom: -100px; border: 1px solid rgba(95,255,213,.08); border-radius: 50%; box-shadow: 0 0 0 28px rgba(95,255,213,.018), 0 0 0 60px rgba(95,255,213,.012); }
.project-featured { grid-column: 1 / -1; min-height: 350px; padding-right: min(38%, 420px); background: linear-gradient(120deg, var(--navy-light), rgba(23,52,81,.9)); }
.project-featured::before { content: "RAG\A  ↓\A agents → evidence\A  ↓\A action"; white-space: pre; position: absolute; right: 8%; top: 50%; transform: translateY(-50%); padding: 2rem; color: var(--green); border: 1px dashed rgba(95,255,213,.32); border-radius: 50%; text-align: center; font: .75rem/1.9 var(--mono); }
.project-index { color: var(--slate); font: .58rem var(--mono); letter-spacing: .12em; }
.project-icon { position: absolute; top: 1.7rem; right: 2rem; color: var(--green); font: 1.6rem var(--mono); }
.project-kicker { margin: 2rem 0 .6rem; font-size: .7rem; }
.project-card h3 { margin: 0 0 1rem; color: var(--white); font-size: clamp(1.35rem, 2.3vw, 1.9rem); line-height: 1.25; }
.project-card > p:not(.project-kicker) { margin: 0 0 1.4rem; }
.project-impact { margin: 1.4rem 0; padding: .7rem 0; color: var(--slate-light); border-block: 1px solid var(--border); font: .7rem var(--mono); }
.project-impact strong { color: var(--green); }

.education { margin-top: 150px; padding: 2.6rem; display: grid; grid-template-columns: 1fr 1.2fr; gap: 3rem; align-items: center; border-block: 1px solid var(--border); }
.education .section-number { margin-bottom: .6rem; }
.education h2 { margin: 0; color: var(--white); font-size: 2rem; }
.education p { margin: .7rem 0 .1rem; color: var(--slate-light); }
.education small { font: .68rem var(--mono); }
.course-cloud { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: .65rem; }
.course-cloud span { padding: .55rem .8rem; border: 1px solid var(--border); border-radius: 99px; color: var(--slate-light); font: .66rem var(--mono); }

.contact { max-width: 720px; padding-top: 160px; padding-bottom: 160px; text-align: center; }
.contact h2 { margin: .2rem 0 1rem; color: var(--white); font-size: clamp(2.6rem, 6vw, 4.5rem); letter-spacing: -.045em; }
.contact p:not(.eyebrow) { max-width: 600px; margin: 0 auto 2.2rem; }
footer { padding: 1.5rem; text-align: center; color: var(--slate); font: .66rem var(--mono); }
.footer-links { display: none; }
footer span { color: var(--green); }

.social-rail, .email-rail { position: fixed; bottom: 0; z-index: 20; display: flex; flex-direction: column; align-items: center; gap: 1.25rem; }
.social-rail { left: 2.5rem; }
.email-rail { right: 2.5rem; }
.social-rail svg { width: 19px; height: 19px; fill: var(--slate); transition: fill .2s, transform .2s; }
.social-rail a:hover svg, .social-rail a:focus-visible svg { fill: var(--green); transform: translateY(-3px); }
.email-rail a { margin-bottom: 1rem; writing-mode: vertical-rl; color: var(--slate); font: .64rem var(--mono); letter-spacing: .1em; transition: color .2s, transform .2s; }
.email-rail a:hover, .email-rail a:focus-visible { color: var(--green); transform: translateY(-3px); }
.rail-line { width: 1px; height: 90px; background: var(--slate); }

.reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: none; }
@keyframes pulse { 50% { opacity: .35; transform: scale(.7); } }
@keyframes spin { to { transform: translate(-50%,-50%) rotate(360deg); } }
@keyframes float { 50% { transform: translateY(-8px); } }
@keyframes scan { 0%, 100% { top: 18%; opacity: .15; } 50% { top: 82%; opacity: .65; } }

@media (max-width: 900px) {
  .social-rail, .email-rail { display: none; }
  .section-shell { width: min(100% - 2.5rem, 720px); }
  .hero { grid-template-columns: 1fr; padding-top: 135px; }
  .portrait-stage { width: min(100%, 500px); margin-inline: auto; }
  .metrics { grid-template-columns: repeat(2, 1fr); }
  .metrics article:nth-child(2) { border-right: 0; }
  .metrics article:nth-child(-n+2) { border-bottom: 1px solid var(--border); }
  .about-grid { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
  .project-featured { grid-column: auto; padding-right: 2rem; }
  .project-featured::before { display: none; }
  .education { grid-template-columns: 1fr; }
  .course-cloud { justify-content: flex-start; }
}

@media (max-width: 700px) {
  .site-header { height: 74px; padding-inline: 1.25rem; }
  .menu-button { display: block; position: relative; z-index: 101; }
  .menu-button[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .menu-button[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .menu-button[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .site-nav { position: fixed; inset: 0 0 0 24%; display: flex; flex-direction: column; justify-content: center; gap: 2rem; background: var(--navy-light); box-shadow: -12px 0 35px rgba(0,0,0,.32); transform: translateX(110%); transition: transform .3s ease; }
  .site-nav.open { transform: translateX(0); }
  .site-nav a:not(.button) { display: flex; flex-direction: column; align-items: center; font-size: .9rem; }
  .site-nav a span { margin: 0 0 .2rem; }
  .hero { min-height: auto; padding-top: 125px; }
  .hero h1 { font-size: clamp(2.75rem, 13vw, 4rem); }
  .hero h2 { font-size: clamp(2rem, 10vw, 3rem); }
  .portrait-stage { aspect-ratio: 1; }
  .metrics article { padding: 1.2rem 1rem; }
  .content-section { padding-top: 110px; }
  .section-heading { margin-bottom: 2.4rem; }
  .section-heading > span { flex: 1; }
  .experience-layout { grid-template-columns: 1fr; }
  .tab-list { flex-direction: row; overflow-x: auto; border-left: 0; border-bottom: 1px solid var(--border); scrollbar-width: none; }
  .tab-list button { flex: 0 0 auto; border-left: 0; border-bottom: 2px solid transparent; white-space: nowrap; }
  .tab-list button[aria-selected="true"] { border-left-color: transparent; border-bottom-color: var(--green); }
  .tab-panels { padding: 2rem 0 0; }
  .project-card { padding: 1.5rem; }
  .education { width: 100%; padding-inline: 1.25rem; }
  .contact { padding-top: 120px; padding-bottom: 110px; }
  .footer-links { display: flex; justify-content: center; gap: 1.4rem; margin-bottom: 1rem; color: var(--slate-light); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
  .cursor-glow { display: none; }
}