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

:root {
  --black: #000000;
  --white: #ffffff;
  --grey-light: #f8f8f8;
  --grey-mid: #e6e6e6;
  --grey-text: #6b6b6b;
  --link: #1a4db8;
  --link-hover: #0d3490;
  --border: 2px solid #000000;
  --border-thin: 1px solid #000000;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
}

html { scroll-behavior: smooth; }

body {
  background: var(--white);
  color: var(--black);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  font-weight: 400;
}

/* ── Scroll reveal ─────────────────────────────────── */
/* js-loaded class added by JS — keeps content visible if JS fails */
.js-loaded .reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.js-loaded .reveal.visible { opacity: 1; transform: none; }

/* ── Navigation ────────────────────────────────────── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: var(--white);
  border-bottom: var(--border);
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 56px;
}

.nav-logo {
  font-size: 1rem;
  font-weight: 700;
  text-decoration: none;
  color: var(--black);
  letter-spacing: 0.02em;
}

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

.nav-links a {
  display: block;
  text-decoration: none;
  color: var(--black);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0 1.25rem;
  height: 56px;
  line-height: 56px;
  border-left: var(--border-thin);
  transition: background 0.15s, color 0.15s;
}
.nav-links li:last-child a { border-right: var(--border-thin); }
.nav-links a:hover { background: var(--black); color: var(--white); }

/* dropdown */
.nav-dropdown { position: relative; }

.nav-dropdown-toggle { padding-right: 1rem; }

.nav-sub {
  display: none;
  position: absolute;
  top: 56px;
  left: 0;
  min-width: 160px;
  background: var(--white);
  border: var(--border);
  border-top: none;
  list-style: none;
  z-index: 200;
}

.nav-sub li { display: block; }

.nav-sub a {
  display: block;
  height: auto;
  line-height: 1;
  padding: 0.85rem 1.25rem;
  border-left: none;
  border-right: none;
  border-bottom: var(--border-thin);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--black);
  text-decoration: none;
  transition: background 0.15s, color 0.15s;
}
.nav-sub li:last-child a { border-bottom: none; }
.nav-sub a:hover { background: var(--black); color: var(--white); }

/* show on hover or keyboard focus */
.nav-dropdown:hover .nav-sub,
.nav-dropdown:focus-within .nav-sub { display: block; }

/* hide gated nav items until authenticated */
li.nav-auth-only { display: none; }
li.nav-auth-only.visible { display: block; }

/* nav auth buttons */
.nav-login, .nav-logout {
  background: var(--black);
  color: var(--white);
  border: none;
  cursor: pointer;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0 1.25rem;
  height: 56px;
  border-left: var(--border-thin);
  transition: background 0.15s, color 0.15s;
}
.nav-login:hover, .nav-logout:hover { background: var(--grey-text); }

/* ── Layout ────────────────────────────────────────── */
.container { max-width: 1100px; margin: 0 auto; padding: 0 2rem; }

section { padding: 5rem 0; border-bottom: var(--border); }

/* ── Section header ────────────────────────────────── */
.section-header {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 3rem;
  padding-bottom: 1rem;
  border-bottom: var(--border);
}
.section-header .sym { font-size: 0.9rem; color: var(--grey-text); }
.section-header h2 { font-size: 1.5rem; font-weight: 600; letter-spacing: 0.02em; }

/* ── Button ────────────────────────────────────────── */
.btn-primary {
  display: inline-block;
  text-decoration: none;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--white);
  background: var(--black);
  border: var(--border);
  padding: 0.85rem 2rem;
  margin-top: 1.5rem;
  transition: background 0.15s, color 0.15s;
}
.btn-primary:hover { background: var(--white); color: var(--black); }

/* ── Hero ──────────────────────────────────────────── */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 56px;
  border-bottom: var(--border);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: var(--border);
}

.hero-text {
  padding: 4rem;
  border-right: var(--border);
}

.hero-eyebrow {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--grey-text);
  margin-bottom: 1.5rem;
}

.hero-text h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
}

.hero-text > p {
  font-size: 1rem;
  color: var(--grey-text);
  max-width: 42ch;
  margin-bottom: 0;
  line-height: 1.75;
}

.hero-tagline {
  font-style: italic;
  font-size: 0.9rem;
  color: var(--grey-text);
  margin-bottom: 1.5rem;
  border-top: var(--border-thin);
  padding-top: 1.5rem;
  margin-top: 1.5rem;
}

.hero-aside {
  padding: 4rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero-stats { display: flex; flex-direction: column; gap: 0; }

.stat-item {
  border-bottom: var(--border-thin);
  padding: 1.5rem 0;
}
.stat-item:first-child { padding-top: 0; }
.stat-item:last-child { border-bottom: none; padding-bottom: 0; }

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  display: block;
  margin-bottom: 0.25rem;
}

.stat-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--grey-text);
}

/* ── Labs grid ─────────────────────────────────────── */
.labs-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: var(--border);
  border-left: var(--border);
}

@media (max-width: 960px) {
  .labs-grid { grid-template-columns: repeat(2, 1fr); }
}

.lab-card {
  padding: 2rem;
  border-right: var(--border);
  border-bottom: var(--border);
  transition: background 0.15s;
}
.lab-card:hover { background: var(--grey-light); }

.card-sym {
  font-size: 1.2rem;
  display: block;
  margin-bottom: 1rem;
}

.card-label {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--grey-text);
  margin-bottom: 0.5rem;
}

.lab-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

.lab-card p {
  font-size: 0.87rem;
  color: var(--grey-text);
  line-height: 1.75;
  margin-bottom: 1.25rem;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.25rem;
}

.tag {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: var(--border-thin);
  padding: 0.25rem 0.6rem;
  color: var(--grey-text);
  transition: background 0.15s, color 0.15s;
  cursor: default;
}
.tag:hover { background: var(--black); color: var(--white); }

.card-link {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--black);
  border-bottom: var(--border);
  padding-bottom: 1px;
  transition: color 0.15s;
}
.card-link { color: var(--link); }
.card-link:hover { color: var(--link-hover); }

/* ── About ─────────────────────────────────────────── */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  border: var(--border);
}

.about-aside {
  padding: 3rem 2.5rem;
  border-right: var(--border);
}

.about-banner {
  width: 100%;
  border: var(--border);
  border-bottom: none;
  overflow: hidden;
  line-height: 0;
}
.about-banner img { width: 100%; height: auto; display: block; }

.about-contact-list { list-style: none; }
.about-contact-list li { border-top: var(--border-thin); }
.about-contact-list a {
  display: block;
  text-decoration: none;
  color: var(--link);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--grey-text);
  padding: 0.6rem 0;
  transition: color 0.15s;
}
.about-contact-list a:hover { color: var(--link-hover); }

.about-body { padding: 3rem; }
.about-body h3 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  line-height: 1.3;
}
.about-body > p {
  font-size: 0.9rem;
  color: var(--grey-text);
  margin-bottom: 1rem;
  line-height: 1.8;
}

.skills-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  margin-top: 2rem;
  border-top: var(--border);
  border-left: var(--border);
}

.skill-item {
  padding: 0.75rem 1rem;
  border-right: var(--border);
  border-bottom: var(--border);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--grey-text);
  transition: background 0.15s, color 0.15s;
}
.skill-item:hover { background: var(--black); color: var(--white); }

/* ── Learning Path ─────────────────────────────────── */
.course-grid {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.course-card {
  border: var(--border);
}

.course-header {
  padding: 2rem;
  border-bottom: var(--border);
}

.course-meta {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1rem;
}

.course-sym { font-size: 1.1rem; color: var(--grey-text); flex-shrink: 0; padding-top: 0.2rem; }

.course-status {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: 0.2rem 0.6rem;
  margin-bottom: 0.4rem;
  border: var(--border-thin);
}
.status-active { background: var(--black); color: var(--white); border-color: var(--black); }
.status-tbd { color: var(--grey-text); }

.course-title { font-size: 1.1rem; font-weight: 700; line-height: 1.2; }
.course-stats {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--grey-text);
  margin-top: 0.25rem;
}
.course-desc { font-size: 0.88rem; color: var(--grey-text); line-height: 1.75; }

/* modules */
.module-list { display: flex; flex-direction: column; }

.module { border-bottom: var(--border-thin); }
.module:last-child { border-bottom: none; }

.module-summary {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.1rem 2rem;
  cursor: pointer;
  list-style: none;
  transition: background 0.15s;
}
.module-summary::-webkit-details-marker { display: none; }
.module-summary:hover { background: var(--grey-light); }

.module-num {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--grey-text);
  width: 1.5rem;
  flex-shrink: 0;
}

.module-summary-text {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.module-title { font-size: 0.92rem; font-weight: 700; }
.module-subtitle { font-size: 0.8rem; color: var(--grey-text); }

.module-chevron {
  font-size: 0.8rem;
  color: var(--grey-text);
  transition: transform 0.2s;
  flex-shrink: 0;
}
details[open] .module-chevron { transform: rotate(180deg); }

.module-body {
  padding: 1rem 2rem 1.5rem calc(2rem + 2.5rem);
  border-top: var(--border-thin);
  background: var(--grey-light);
}

.module-topics {
  list-style: none;
  margin-bottom: 1.25rem;
}
.module-topics li {
  font-size: 0.84rem;
  color: var(--grey-text);
  line-height: 1.7;
  padding: 0.25rem 0;
  border-bottom: 1px solid var(--grey-mid);
  padding-left: 0.75rem;
  position: relative;
}
.module-topics li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--grey-mid);
}

.module-build-label {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--grey-text);
  margin-bottom: 0.25rem;
}
.module-build-value {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--black);
  margin-bottom: 1rem;
}

.module-tools { display: flex; flex-wrap: wrap; gap: 0.4rem; }

@media (max-width: 768px) {
  .module-body { padding-left: 2rem; }
}

/* ── Experience ────────────────────────────────────── */
.timeline { border: var(--border); }

.timeline-item {
  display: grid;
  grid-template-columns: 160px 1fr;
  border-bottom: var(--border);
}
.timeline-item:last-child { border-bottom: none; }

.tl-year {
  padding: 2rem;
  border-right: var(--border);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--grey-text);
}

.tl-content { padding: 2rem; }
.tl-content h4 { font-size: 1rem; font-weight: 700; margin-bottom: 0.2rem; }
.tl-content .tl-org {
  font-size: 0.8rem;
  color: var(--grey-text);
  font-weight: 600;
  letter-spacing: 0.04em;
  margin-bottom: 0.75rem;
}
.tl-content p { font-size: 0.87rem; color: var(--grey-text); line-height: 1.75; }

/* ── Focus areas ───────────────────────────────────── */
.focus-areas { margin-top: 2rem; margin-bottom: 0; }

.focus-label {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--grey-text);
  margin-bottom: 0.75rem;
}

.focus-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border: var(--border);
  margin-bottom: 2rem;
}

.focus-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.65rem 1rem;
  border-right: var(--border);
  border-bottom: var(--border);
  font-size: 0.82rem;
  font-weight: 600;
}
.focus-item:nth-child(even) { border-right: none; }
.focus-item:nth-last-child(-n+2) { border-bottom: none; }

.focus-sym { color: var(--grey-text); font-size: 0.8rem; }

/* ── Vision ────────────────────────────────────────── */
.vision-intro {
  font-size: 0.95rem;
  color: var(--grey-text);
  max-width: 62ch;
  margin-bottom: 2.5rem;
  line-height: 1.75;
}

.inline-link {
  color: var(--link);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.inline-link:hover { color: var(--link-hover); }

.vision-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: var(--border);
  border-left: var(--border);
  margin-bottom: 2rem;
}

.vision-card {
  padding: 2rem;
  border-right: var(--border);
  border-bottom: var(--border);
}

.vision-card-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: var(--border-thin);
}

.vision-sym { font-size: 1rem; color: var(--grey-text); flex-shrink: 0; }

.vision-card h3 {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.25;
}

.vision-card > p {
  font-size: 0.85rem;
  color: var(--grey-text);
  line-height: 1.8;
  margin-bottom: 1.25rem;
}

.vision-note {
  border: var(--border);
  padding: 1.5rem 2rem;
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  background: var(--grey-light);
}

.vision-note-sym {
  font-size: 0.9rem;
  color: var(--grey-text);
  flex-shrink: 0;
  margin-top: 0.15rem;
}

.vision-note p {
  font-size: 0.87rem;
  color: var(--grey-text);
  line-height: 1.75;
}

.vision-note strong { color: var(--black); }

@media (max-width: 768px) {
  .vision-grid { grid-template-columns: 1fr; }
  .focus-grid { grid-template-columns: 1fr; }
  .focus-item { border-right: none; }
  .focus-item:nth-last-child(-n+2) { border-bottom: var(--border); }
  .focus-item:last-child { border-bottom: none; }
}

/* ── Collaborations ────────────────────────────────── */
.collab-intro {
  font-size: 0.95rem;
  color: var(--grey-text);
  max-width: 60ch;
  margin-bottom: 2rem;
  line-height: 1.75;
}

.collab-list { border: var(--border); }

.collab-item {
  display: grid;
  grid-template-columns: 280px 1fr 2rem;
  align-items: center;
  gap: 2rem;
  padding: 1.5rem 2rem;
  border-bottom: var(--border);
  text-decoration: none;
  color: var(--black);
  transition: background 0.15s;
}
.collab-item:last-child { border-bottom: none; }
.collab-item:hover { background: var(--grey-light); }
.collab-item:hover .collab-arrow { transform: translate(2px, -2px); }

.collab-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.collab-sym { font-size: 1rem; flex-shrink: 0; color: var(--grey-text); }

.collab-category {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--grey-text);
  margin-bottom: 0.2rem;
}

.collab-name { font-size: 0.95rem; font-weight: 700; line-height: 1.2; color: var(--link); }
.collab-item:hover .collab-name { color: var(--link-hover); }

.collab-desc { font-size: 0.85rem; color: var(--grey-text); line-height: 1.7; }

.collab-arrow {
  font-size: 1rem;
  color: var(--grey-text);
  transition: transform 0.2s;
  justify-self: end;
}

/* ── Events ────────────────────────────────────────── */
.events-list { border: var(--border); }

.event-item {
  display: grid;
  grid-template-columns: 180px 1fr 2rem;
  align-items: center;
  gap: 2rem;
  padding: 2rem;
  border-bottom: var(--border);
  text-decoration: none;
  color: var(--black);
  transition: background 0.15s;
}
.event-item:last-child { border-bottom: none; }
.event-item:hover { background: var(--grey-light); }
.event-item:hover .event-arrow { transform: translate(2px, -2px); }

.event-item--static { cursor: default; }
.event-item--static:hover { background: transparent; }

.event-date {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--grey-text);
  line-height: 1.5;
}

.event-role {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--grey-text);
  margin-bottom: 0.25rem;
}

.event-name {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.3rem;
  line-height: 1.3;
  color: var(--link);
}

.event-location {
  font-size: 0.82rem;
  color: var(--grey-text);
}

.event-arrow {
  font-size: 1rem;
  color: var(--grey-text);
  transition: transform 0.2s;
  justify-self: end;
}

@media (max-width: 768px) {
  .event-item { grid-template-columns: 1fr; gap: 0.5rem; }
  .event-arrow { display: none; }
}

/* ── Contact ───────────────────────────────────────── */
#contact { border-bottom: none; }

.contact-inner {
  border: var(--border);
  display: grid;
  grid-template-columns: 2fr 1fr;
}

.contact-body {
  padding: 4rem;
  border-right: var(--border);
}
.contact-body h2 {
  font-size: clamp(2rem, 4vw, 3.5rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
}
.contact-body > p {
  font-size: 0.9rem;
  color: var(--grey-text);
  margin-bottom: 2rem;
  line-height: 1.75;
  max-width: 44ch;
}

.contact-aside {
  padding: 4rem 2.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0;
}

.contact-item {
  border-bottom: var(--border-thin);
  padding: 1.25rem 0;
}
.contact-item:first-child { padding-top: 0; }
.contact-item:last-child { border-bottom: none; padding-bottom: 0; }

.ci-label {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--grey-text);
  margin-bottom: 0.3rem;
}

.ci-value {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--black);
  text-decoration: none;
}
a.ci-value { color: var(--link); }
a.ci-value:hover { color: var(--link-hover); }

/* ── Mission ────────────────────────────────────────── */
.mission-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  border: var(--border);
  margin-top: 2.5rem;
}

.mission-card {
  padding: 2rem;
  border-right: var(--border);
}
.mission-card:last-child { border-right: none; }

.mission-card-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  padding-bottom: 1rem;
  border-bottom: var(--border-thin);
}

.mission-sym { font-size: 1.1rem; }
.mission-card-header h3 { font-size: 1rem; font-weight: 700; }
.mission-card > p { font-size: 0.88rem; color: var(--grey-text); line-height: 1.6; margin-bottom: 1.5rem; }

.mission-tests {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.mission-test-col .mission-test-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--black);
  margin-bottom: 0.5rem;
}

.mission-test-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.mission-test-col li {
  font-size: 0.82rem;
  color: var(--grey-text);
  line-height: 1.4;
  padding-left: 0.75rem;
  position: relative;
}
.mission-test-col li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--grey-text);
}

.mission-steps {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.mission-step { padding-bottom: 1.25rem; border-bottom: var(--border-thin); }
.mission-step:last-child { border-bottom: none; padding-bottom: 0; }

.mission-step-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.4rem;
}

.mission-step p {
  font-size: 0.88rem;
  color: var(--grey-text);
  line-height: 1.5;
}

.mission-step a {
  color: var(--link);
  font-weight: 600;
}
.mission-step a:hover { color: var(--link-hover); }

/* ── Roadmap ────────────────────────────────────────── */
.roadmap-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border: var(--border);
  margin-top: 2.5rem;
}

.roadmap-phase {
  padding: 2rem;
  border-right: var(--border);
}
.roadmap-phase:last-child { border-right: none; }

.roadmap-phase-header {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1.25rem;
  border-bottom: var(--border-thin);
}

.roadmap-sym {
  font-size: 1.25rem;
  flex-shrink: 0;
  margin-top: 0.1rem;
}

.roadmap-timeframe {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--grey-text);
  margin-bottom: 0.25rem;
}

.roadmap-label {
  font-size: 1rem;
  font-weight: 700;
}

.roadmap-items {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.roadmap-items li { font-size: 0.88rem; line-height: 1.5; }

.roadmap-items a {
  color: var(--link);
  text-decoration: none;
}
.roadmap-items a:hover { color: var(--link-hover); }

/* ── Resources ──────────────────────────────────────── */
.resources-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  border: var(--border);
  margin-top: 2.5rem;
}

.resource-category {
  padding: 2rem;
  border-right: var(--border);
  border-bottom: var(--border);
}
.resource-category:nth-child(2n) { border-right: none; }
.resource-category:nth-last-child(-n+2) { border-bottom: none; }

.resource-category-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  padding-bottom: 1rem;
  border-bottom: var(--border-thin);
}

.resource-sym { font-size: 1.1rem; }

.resource-category-header h3 {
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.resource-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.resource-item { display: flex; flex-direction: column; gap: 0.2rem; }

.resource-title {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--link);
  text-decoration: none;
}
.resource-title:hover { color: var(--link-hover); }

.resource-source {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--grey-text);
}

.resource-desc {
  font-size: 0.82rem;
  color: var(--grey-text);
  line-height: 1.5;
}

/* ── Tools ──────────────────────────────────────────── */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  border: var(--border);
  margin-top: 2.5rem;
}

.tool-card {
  padding: 2rem;
  border-right: var(--border);
  border-bottom: var(--border);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.tool-card:nth-child(2n) { border-right: none; }
.tool-card:nth-last-child(-n+2) { border-bottom: none; }

.tool-card-header {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.tool-sym { font-size: 1.25rem; flex-shrink: 0; margin-top: 0.25rem; }

.tool-status {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.2rem 0.5rem;
  border: var(--border-thin);
  margin-bottom: 0.4rem;
}

.tool-name {
  font-size: 1.05rem;
  font-weight: 700;
}

.tool-desc {
  font-size: 0.88rem;
  color: var(--grey-text);
  line-height: 1.6;
  flex: 1;
}

.tool-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding-top: 1rem;
  border-top: var(--border-thin);
}

.tool-link {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--link);
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
}
.tool-link:hover { color: var(--link-hover); }

/* ── Opportunities ──────────────────────────────────── */
.opportunities-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border: var(--border);
  margin-top: 2.5rem;
}

.opportunity-item {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 2rem;
  padding: 1.5rem 2rem;
  border-bottom: var(--border-thin);
  text-decoration: none;
  color: var(--black);
  transition: background 0.15s ease;
}
.opportunity-item:last-child { border-bottom: none; }
.opportunity-item:hover { background: var(--grey-light); }

.opportunity-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
  color: var(--link);
}

.opportunity-org {
  font-size: 0.82rem;
  color: var(--grey-text);
  font-weight: 500;
}

.opportunity-arrow {
  font-size: 1.1rem;
  flex-shrink: 0;
  color: var(--grey-text);
}

/* ── Footer ────────────────────────────────────────── */
footer {
  padding: 1.25rem 2rem;
  border-top: var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--grey-text);
}

/* ── Mobile nav toggle ─────────────────────────────── */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  margin-right: -0.5rem;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--black);
  transition: transform 0.2s, opacity 0.2s;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Responsive ────────────────────────────────────── */
@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .nav-links {
    display: none;
    position: fixed;
    top: 56px; left: 0; right: 0; bottom: 0;
    background: var(--white);
    border-top: var(--border);
    flex-direction: column;
    overflow-y: auto;
    z-index: 99;
  }
  .nav-links.open { display: flex; }
  .nav-links > li { border-bottom: var(--border-thin); }
  .nav-links a { border: none; height: auto; line-height: 1; padding: 1rem 1.5rem; font-size: 0.9rem; }
  .nav-sub { display: block; position: static; border: none; border-top: var(--border-thin); min-width: 0; }
  .nav-sub a { padding-left: 2.5rem; background: var(--grey-light); }
  .hero-inner { grid-template-columns: 1fr; }
  .hero-text { border-right: none; border-bottom: var(--border); padding: 2.5rem; }
  .hero-aside { padding: 2.5rem; }
  .about-grid { grid-template-columns: 1fr; }
  .about-aside { border-right: none; border-bottom: var(--border); }
  .about-body { padding: 2rem; }
  .contact-inner { grid-template-columns: 1fr; }
  .contact-body { border-right: none; border-bottom: var(--border); padding: 2.5rem; }
  .contact-aside { padding: 2.5rem; }
  .timeline-item { grid-template-columns: 1fr; }
  .tl-year { border-right: none; border-bottom: var(--border-thin); padding: 1.25rem 2rem 0.75rem; }
  .skills-grid { grid-template-columns: 1fr; }
  .collab-item { grid-template-columns: 1fr; gap: 0.75rem; }
  .collab-arrow { display: none; }
  .tools-grid { grid-template-columns: 1fr; }
  .tool-card { border-right: none; }
  .tool-card:nth-last-child(-n+2) { border-bottom: var(--border); }
  .tool-card:last-child { border-bottom: none; }
  .roadmap-grid { grid-template-columns: 1fr; }
  .resources-grid { grid-template-columns: 1fr; }
  .opportunity-item { grid-template-columns: 1fr; }
  .opportunity-arrow { display: none; }
  .mission-grid { grid-template-columns: 1fr; }
  .mission-card { border-right: none; border-bottom: var(--border); }
  .mission-card:last-child { border-bottom: none; }
  .mission-tests { grid-template-columns: 1fr; }
  .labs-grid { grid-template-columns: 1fr; }
}