:root {
  --bg: #07101d;
  --bg-soft: #0b1626;
  --panel: rgba(15, 28, 46, 0.78);
  --panel-solid: #0f1c2e;
  --panel-2: #12233a;
  --text: #f4f7fb;
  --muted: #9aabc1;
  --line: rgba(171, 198, 225, 0.15);
  --line-strong: rgba(171, 198, 225, 0.27);
  --accent: #5eead4;
  --accent-2: #7dd3fc;
  --accent-ink: #04110f;
  --shadow: 0 30px 80px rgba(0, 0, 0, 0.28);
  --radius: 24px;
  --radius-sm: 16px;
  --container: 1160px;
}

html[data-theme="light"] {
  --bg: #f5f8fc;
  --bg-soft: #edf3f9;
  --panel: rgba(255,255,255,.82);
  --panel-solid: #ffffff;
  --panel-2: #f7fafe;
  --text: #0d1b2a;
  --muted: #586b82;
  --line: rgba(13, 42, 68, 0.11);
  --line-strong: rgba(13, 42, 68, 0.20);
  --accent: #087c73;
  --accent-2: #1677b8;
  --accent-ink: #ffffff;
  --shadow: 0 24px 70px rgba(44, 72, 100, 0.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
section[id], main[id] { scroll-margin-top: 92px; }
body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 82% 8%, rgba(94, 234, 212, .10), transparent 24rem),
    radial-gradient(circle at 4% 22%, rgba(125, 211, 252, .08), transparent 23rem),
    var(--bg);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button:focus-visible, a:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; }
img, svg { max-width: 100%; }
::selection { background: var(--accent); color: var(--accent-ink); }

.skip-link {
  position: fixed; left: 16px; top: -80px; z-index: 9999;
  background: var(--accent); color: var(--accent-ink); padding: 10px 14px;
  border-radius: 10px; text-decoration: none; font-weight: 800;
}
.skip-link:focus { top: 16px; }

.container { width: min(calc(100% - 40px), var(--container)); margin: 0 auto; }
.section { padding: 110px 0; }

.site-header {
  position: sticky; top: 0; z-index: 100;
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--line);
}
.nav-wrap { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 11px; text-decoration: none; font-weight: 850; letter-spacing: -.02em; }
.brand-mark { width: 36px; height: 36px; border: 1px solid var(--line-strong); border-radius: 11px; display: grid; place-items: center; color: var(--accent); background: var(--panel); font-size: 12px; letter-spacing: .08em; }
.desktop-nav { display: flex; gap: 26px; }
.mobile-nav-cv, .icon-button.menu-toggle { display: none; }
.desktop-nav a, .site-footer a { text-decoration: none; color: var(--muted); font-weight: 650; font-size: 14px; transition: color .2s ease; }
.desktop-nav a:hover, .site-footer a:hover { color: var(--text); }
.nav-actions { display: flex; align-items: center; gap: 10px; }
.icon-button { width: 40px; height: 40px; border-radius: 12px; border: 1px solid var(--line); background: var(--panel); color: var(--text); display: grid; place-items: center; cursor: pointer; }
.icon-button svg { width: 18px; height: 18px; fill: currentColor; }

.button { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 48px; padding: 0 18px; border-radius: 13px; background: var(--accent); color: var(--accent-ink); text-decoration: none; font-weight: 850; border: 1px solid transparent; transition: transform .2s ease, box-shadow .2s ease, background .2s ease; }
.button:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(94, 234, 212, .15); }
.button-small { min-height: 40px; padding: 0 14px; font-size: 13px; }
.button-ghost { background: transparent; color: var(--text); border-color: var(--line-strong); box-shadow: none; }
.button-ghost:hover { background: var(--panel); box-shadow: none; }
.text-link { color: var(--accent); font-weight: 800; text-decoration: none; }

.hero { padding-top: 86px; min-height: calc(100vh - 72px); display: flex; align-items: center; }
.hero-grid { display: grid; grid-template-columns: 1.08fr .92fr; gap: 68px; align-items: center; }
.eyebrow, .project-label, .research-badge { display: inline-flex; align-items: center; gap: 9px; color: var(--muted); font-size: 13px; font-weight: 750; border: 1px solid var(--line); background: var(--panel); border-radius: 999px; padding: 8px 12px; }
.status-dot, .live-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 5px color-mix(in srgb, var(--accent) 12%, transparent); }
.hero h1 { font-size: clamp(52px, 6vw, 82px); line-height: .98; letter-spacing: -.065em; margin: 24px 0 26px; max-width: 850px; }
.hero h1 span { color: var(--muted); }
.hero-lead { font-size: 18px; color: var(--muted); max-width: 760px; margin: 0; }
.hero-lead strong { color: var(--text); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.hero-meta { margin-top: 46px; display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); padding-top: 24px; max-width: 720px; }
.hero-meta div { display: flex; flex-direction: column; gap: 4px; padding-right: 16px; }
.hero-meta strong { font-size: 17px; letter-spacing: -.02em; }
.hero-meta span { color: var(--muted); font-size: 12px; }

.kicker { color: var(--accent); font-size: 12px; font-weight: 900; text-transform: uppercase; letter-spacing: .14em; margin-bottom: 12px; }
.section-heading { max-width: 780px; margin-bottom: 42px; }
.section-heading h2, .contact-card h2, .education-card h2 { font-size: clamp(36px, 4.8vw, 58px); line-height: 1.04; letter-spacing: -.055em; margin: 0 0 18px; }
.section-heading p { color: var(--muted); font-size: 17px; margin: 0; }

.featured-card { display: grid; grid-template-columns: 1.05fr .95fr; border: 1px solid var(--line-strong); background: var(--panel); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.featured-main { padding: 46px; }
.featured-main h3, .research-story h3 { font-size: 34px; line-height: 1.1; letter-spacing: -.04em; margin: 20px 0 14px; }
.featured-description { color: var(--muted); font-size: 16px; margin: 0 0 28px; max-width: 720px; }
.project-points { display: grid; gap: 12px; margin: 28px 0; }
.project-points > div { display: grid; grid-template-columns: 32px 1fr; gap: 12px; align-items: start; }
.project-points span { color: var(--accent); font-family: ui-monospace, monospace; font-size: 11px; padding-top: 4px; }
.project-points p { margin: 0; color: var(--muted); font-size: 14px; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tags span, .skill-list span { display: inline-flex; border: 1px solid var(--line); background: color-mix(in srgb, var(--panel-2) 82%, transparent); color: var(--muted); border-radius: 999px; padding: 7px 10px; font-size: 11px; font-weight: 700; }
.project-actions { display: flex; gap: 15px; align-items: center; flex-wrap: wrap; margin-top: 30px; }
.privacy-note { color: var(--muted); font-size: 11px; }
.research-section { background: linear-gradient(180deg, transparent, color-mix(in srgb, var(--bg-soft) 60%, transparent), transparent); }
.research-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 24px; }
.research-story { border: 1px solid var(--line); border-radius: var(--radius); padding: 40px; background: var(--panel); }
.research-subtitle { color: var(--accent); font-weight: 750; }
.research-story > p:not(.research-subtitle) { color: var(--muted); }
.research-metrics { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.metric-card { min-height: 190px; border-radius: var(--radius-sm); border: 1px solid var(--line); background: var(--panel); padding: 25px; display: flex; flex-direction: column; justify-content: flex-end; }
.metric-primary { background: linear-gradient(145deg, color-mix(in srgb, var(--accent) 16%, var(--panel-solid)), var(--panel)); border-color: color-mix(in srgb, var(--accent) 35%, var(--line)); }
.metric-value { display: block; color: var(--accent); font-size: 39px; font-weight: 900; letter-spacing: -.05em; line-height: 1; margin-bottom: 15px; }
.metric-card strong { font-size: 14px; }
.metric-card p { color: var(--muted); font-size: 12px; line-height: 1.5; margin: 6px 0 0; }
.research-method { display: grid; grid-template-columns: repeat(3,1fr); gap: 14px; margin-top: 24px; }
.research-method > div { border-top: 1px solid var(--line-strong); padding: 23px 18px 0 0; }
.research-method span { color: var(--accent); font-family: ui-monospace, monospace; font-size: 12px; }
.research-method strong { display: block; margin: 10px 0 7px; }
.research-method p { color: var(--muted); font-size: 13px; margin: 0; }

.project-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 16px; }
.project-card { border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--panel); padding: 30px; transition: transform .25s ease, border-color .25s ease; }
.project-card:hover { transform: translateY(-4px); border-color: var(--line-strong); }
.project-icon { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 12px; color: var(--accent); background: color-mix(in srgb, var(--accent) 10%, transparent); border: 1px solid color-mix(in srgb, var(--accent) 20%, transparent); font-size: 11px; font-weight: 900; letter-spacing: .08em; }
.project-card h3 { font-size: 21px; margin: 20px 0 9px; letter-spacing: -.025em; }
.project-card p { color: var(--muted); margin: 0 0 20px; font-size: 14px; }

.skills-section { background: color-mix(in srgb, var(--bg-soft) 54%, transparent); }
.skills-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: 80px; align-items: start; }
.skills-layout .section-heading { position: sticky; top: 105px; margin: 0; }
.skills-groups { display: grid; gap: 20px; }
.skill-group { border-bottom: 1px solid var(--line); padding-bottom: 20px; }
.skill-group h3 { margin: 0 0 14px; font-size: 15px; }
.skill-list { display: flex; flex-wrap: wrap; gap: 8px; }

.education-section { padding-top: 90px; }
.education-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 16px; }
.education-card, .cert-card { border: 1px solid var(--line); background: var(--panel); border-radius: var(--radius); padding: 38px; }
.education-card h2 { font-size: 36px; margin-bottom: 10px; }
.education-school { color: var(--muted); margin: 0 0 26px; }
.education-meta { display: flex; flex-wrap: wrap; gap: 8px; }
.education-meta span { font-size: 12px; padding: 7px 10px; border: 1px solid var(--line); border-radius: 999px; color: var(--muted); }
.cert-card ul { list-style: none; padding: 0; margin: 22px 0 0; display: grid; gap: 18px; }
.cert-card li { display: flex; flex-direction: column; gap: 3px; padding-bottom: 16px; border-bottom: 1px solid var(--line); }
.cert-card li:last-child { border-bottom: 0; }
.cert-card span { color: var(--muted); font-size: 12px; }

.contact-section { padding-bottom: 80px; }
.contact-card { display: grid; grid-template-columns: 1fr auto; gap: 50px; align-items: center; border: 1px solid color-mix(in srgb, var(--accent) 25%, var(--line)); border-radius: 30px; padding: 52px; background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 8%, var(--panel-solid)), var(--panel)); box-shadow: var(--shadow); }
.contact-card h2 { font-size: 44px; }
.contact-card p { color: var(--muted); max-width: 720px; margin: 0; }
.contact-actions { display: flex; flex-direction: column; gap: 10px; align-items: stretch; min-width: 280px; }
.contact-actions .text-link { margin-top: 8px; font-size: 13px; text-align: center; }
.site-footer { border-top: 1px solid var(--line); padding: 26px 0 40px; }
.footer-row { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.footer-row p { margin: 0; color: var(--muted); font-size: 12px; }

@media (max-width: 980px) {
  .nav-wrap { position: relative; }
  .desktop-nav { display: none; position: absolute; top: calc(100% - 1px); left: 0; right: 0; padding: 16px; border: 1px solid var(--line-strong); border-radius: 0 0 16px 16px; background: var(--panel-solid); box-shadow: var(--shadow); flex-direction: column; gap: 0; }
  .desktop-nav.is-open { display: flex; }
  .desktop-nav a { padding: 10px 12px; }
  .desktop-nav .mobile-nav-cv { display: block; color: var(--accent); }
  .icon-button.menu-toggle { display: grid; }
  .nav-actions .button-small { display: none; }
  .hero { min-height: auto; }
  .hero-grid, .featured-card, .research-grid, .skills-layout, .education-grid, .contact-card { grid-template-columns: 1fr; }
  .hero-grid { gap: 50px; }
  .featured-side { border-left: 0; border-top: 1px solid var(--line); }
  .skills-layout { gap: 38px; }
  .skills-layout .section-heading { position: static; }
  .contact-actions { min-width: 0; width: 100%; }
}

@media (max-width: 680px) {
  .container { width: min(calc(100% - 28px), var(--container)); }
  .section { padding: 78px 0; }
  .site-header .brand-name { display: none; }
  .nav-wrap { min-height: 64px; }
  .hero { padding-top: 62px; }
  .hero h1 { font-size: clamp(43px, 14vw, 62px); }
  .hero h1 { overflow-wrap: anywhere; }
  .hero-lead { font-size: 16px; }
  .hero-meta { grid-template-columns: 1fr; gap: 16px; }
  .hero-meta div { border-bottom: 1px solid var(--line); padding: 0 0 12px; }
  .featured-main, .research-story, .education-card, .cert-card { padding: 26px; }
  .featured-side { padding: 24px; }
  .featured-main h3, .research-story h3 { font-size: 28px; }
  .research-metrics, .project-grid, .research-method { grid-template-columns: 1fr; }
  .metric-card { min-height: 150px; }
  .section-heading h2, .contact-card h2 { font-size: 38px; }
  .contact-card { padding: 30px 24px; }
  .footer-row { align-items: flex-start; flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
}

/* Research-led hero and a concrete platform workflow. */
.section { padding-block: 92px; }
.hero { min-height: 0; padding-block: 76px 84px; }
.hero-grid { grid-template-columns: 1.05fr .95fr; gap: 56px; }
.hero h1 { margin: 26px 0 21px; }
.hero-role { color: var(--accent); font-size: 14px; font-weight: 800; line-height: 1.8; margin: 0 0 20px; }
.hero-role span { color: var(--muted); padding-inline: 5px; }
.hero-lead { font-size: 17px; }
.hero-actions { align-items: center; margin-top: 30px; }
.hero-github { color: var(--accent); font-size: 14px; font-weight: 800; text-decoration: none; padding: 12px 8px; }
.hero-github:hover { text-decoration: underline; text-underline-offset: 5px; }
.hero-meta { margin-top: 38px; }
.hero-visual { position: relative; display: grid; gap: 14px; }
.hero-visual::before { inset: 10% -4%; background: radial-gradient(circle, color-mix(in srgb, var(--accent) 22%, transparent), transparent 68%); filter: blur(26px); pointer-events: none; }
.signal-card { position: relative; border: 1px solid var(--line-strong); border-radius: 24px; background: var(--panel-solid); box-shadow: var(--shadow); padding: 28px; overflow: hidden; }
.signal-card::before { content: ""; position: absolute; width: 220px; height: 220px; border: 1px solid color-mix(in srgb, var(--accent) 17%, transparent); border-radius: 50%; top: -125px; right: -95px; box-shadow: 0 0 0 36px color-mix(in srgb, var(--accent) 4%, transparent), 0 0 0 72px color-mix(in srgb, var(--accent) 3%, transparent); }
.signal-top, .workflow-top { position: relative; display: flex; justify-content: space-between; gap: 12px; align-items: center; font-size: 10px; letter-spacing: .12em; font-weight: 850; color: var(--muted); }
.signal-live { color: var(--accent); text-align: right; }
.signal-title { position: relative; font-size: clamp(29px, 3vw, 43px); line-height: 1.13; letter-spacing: -.05em; font-weight: 700; margin: 38px 0 27px; }
.signal-title strong { color: var(--accent); font-weight: 850; }
.signal-track { display: grid; grid-template-columns: repeat(3, 1fr); gap: 9px; padding-block: 15px; border-block: 1px solid var(--line); }
.signal-track span { color: var(--muted); font-size: 11px; line-height: 1.35; }
.signal-track span + span { border-left: 1px solid var(--line); padding-left: 9px; }
.signal-models { display: flex; flex-wrap: wrap; gap: 7px; padding-block: 19px; }
.signal-models span { border: 1px solid var(--line); border-radius: 7px; padding: 5px 8px; color: var(--muted); font-size: 10px; font-weight: 700; }
.signal-results { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.signal-results > div { border-radius: 13px; border: 1px solid color-mix(in srgb, var(--accent) 25%, var(--line)); background: color-mix(in srgb, var(--accent) 8%, var(--panel)); padding: 15px; }
.signal-results small { display: block; color: var(--muted); font-size: 9px; font-weight: 800; letter-spacing: .08em; line-height: 1.4; }
.signal-results strong { display: block; color: var(--accent); font-size: 29px; line-height: 1.1; letter-spacing: -.05em; margin-top: 7px; }
.delivery-note { position: relative; display: flex; flex-direction: column; gap: 5px; padding: 18px 21px; border: 1px solid var(--line); border-radius: 16px; background: var(--panel); }
.delivery-note span { color: var(--muted); font-size: 10px; font-weight: 750; letter-spacing: .08em; }
.delivery-note strong { font-size: 14px; line-height: 1.35; }
.featured-side { min-height: 100%; display: flex; align-items: center; justify-content: center; padding: 38px; background: linear-gradient(145deg, color-mix(in srgb, var(--accent) 8%, var(--bg-soft)), var(--bg-soft)); border-left: 1px solid var(--line); }
.workflow-card { width: 100%; border: 1px solid var(--line-strong); border-radius: 20px; background: var(--panel-solid); box-shadow: 0 25px 55px rgba(0,0,0,.16); overflow: hidden; }
.workflow-top { padding: 21px; border-bottom: 1px solid var(--line); }
.workflow-top strong { color: var(--accent); font-size: 16px; letter-spacing: 0; }
.workflow-steps { padding: 13px 21px; display: grid; }
.workflow-steps > div { display: grid; grid-template-columns: 32px 1fr; column-gap: 13px; border-bottom: 1px solid var(--line); padding: 14px 0; }
.workflow-steps > div:last-child { border-bottom: 0; }
.workflow-steps span { grid-row: span 2; color: var(--accent); font: 700 12px ui-monospace, monospace; padding-top: 2px; }
.workflow-steps strong { font-size: 15px; line-height: 1.2; }
.workflow-steps small { color: var(--muted); font-size: 11px; margin-top: 2px; }
.workflow-bottom { border-top: 1px solid var(--line); padding: 15px 21px; display: flex; flex-wrap: wrap; gap: 7px; }
.workflow-bottom span { color: var(--accent); background: color-mix(in srgb, var(--accent) 9%, transparent); padding: 5px 7px; border-radius: 5px; font-size: 10px; font-weight: 750; }
.lab-panel { display: grid; grid-template-columns: 1fr .9fr; gap: 48px; align-items: center; margin-top: 24px; padding: 42px; border: 1px solid var(--line-strong); border-radius: var(--radius); background: linear-gradient(135deg, var(--panel), var(--bg-soft)); }
.lab-copy h3 { font-size: clamp(28px, 3.5vw, 40px); line-height: 1.12; letter-spacing: -.045em; margin: 0 0 18px; }
.lab-copy p { color: var(--muted); font-size: 14px; margin: 0 0 16px; }
.lab-copy strong { color: var(--text); }
.lab-source { font-size: 12px !important; }
.demo-form { display: grid; gap: 19px; padding: 28px; border: 1px solid var(--line-strong); border-radius: 18px; background: var(--panel-solid); }
.form-heading { display: grid; gap: 4px; padding-bottom: 16px; border-bottom: 1px solid var(--line); }
.form-heading span { color: var(--accent); font-size: 10px; font-weight: 850; letter-spacing: .12em; }
.form-heading strong { font-size: 20px; }
.form-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 13px; }
.form-grid label { display: grid; align-content: start; gap: 7px; font-size: 13px; font-weight: 750; }
.form-grid label span { color: var(--muted); font-size: 11px; font-weight: 500; }
.form-grid input { width: 100%; min-width: 0; padding: 12px 13px; border: 1px solid var(--line-strong); border-radius: 10px; background: var(--bg); color: var(--text); font: inherit; font-size: 15px; }
.form-grid input:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.demo-form .button { cursor: pointer; font: inherit; }
.demo-result { min-height: 70px; display: flex; flex-direction: column; justify-content: center; gap: 2px; border-top: 1px solid var(--line); padding-top: 15px; color: var(--muted); font-size: 13px; }
.demo-result strong { color: var(--accent); font-size: 32px; line-height: 1.1; }
.demo-result small { color: var(--muted); font-size: 11px; }
.form-privacy { color: var(--muted); font-size: 11px; margin: -8px 0 0; }
@media (max-width: 980px) { .hero-grid, .lab-panel { grid-template-columns: minmax(0, 1fr); } .hero-visual::before { inset-inline: 0; } .featured-side { border-left: 0; border-top: 1px solid var(--line); } }
@media (max-width: 680px) {
  .section { padding-block: 74px; }
  .hero { padding-top: 56px; }
  .signal-card { padding: 21px; }
  .signal-top { font-size: 9px; }
  .signal-results strong { font-size: 26px; }
  .lab-panel { padding: 23px; gap: 20px; }
  .demo-form { padding: 20px; }
  .form-grid { grid-template-columns: 1fr; }
}