:root {
  --bg: #fbfbfa;
  --surface: #ffffff;
  --text: #0b1220;
  --muted: #5b6473;
  --muted-2: #8a94a4;
  --accent: #1d4ed8;
  --accent-hover: #1e3a8a;
  --accent-soft: #eef4ff;
  --accent-ink: #0a2472;
  --border: #e6e8ee;
  --border-strong: #c9ced9;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, .04);
  --shadow-md: 0 10px 30px rgba(15, 23, 42, .06);
  --radius: 16px;
  --radius-sm: 10px;
  --max: 1120px;
  --transition: 200ms cubic-bezier(.4, 0, .2, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: inherit; }

.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  background: var(--accent);
  color: #fff;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-weight: 500;
  z-index: 1000;
  transition: top var(--transition);
}
.skip-link:focus { top: 12px; }

.container {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px;
}
.container.narrow { max-width: 760px; }

section {
  padding: 96px 0;
  scroll-margin-top: 72px;
}
@media (max-width: 720px) {
  section { padding: 64px 0; }
}

h1, h2, h3 {
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}
h1 { font-size: clamp(2.25rem, 5vw, 3.5rem); line-height: 1.08; }
h2 {
  font-size: clamp(1.625rem, 2.6vw, 2rem);
  margin-bottom: 36px;
  display: flex;
  align-items: center;
  gap: 16px;
}
h2::before {
  content: '';
  width: 28px;
  height: 1.5px;
  background: var(--accent);
  flex-shrink: 0;
}
h3 { font-size: 1.0625rem; line-height: 1.4; }
p { margin: 0 0 16px; }
p:last-child { margin-bottom: 0; }

.muted { color: var(--muted); }
.eyebrow {
  font-size: .8125rem;
  text-transform: uppercase;
  letter-spacing: .14em;
  color: var(--muted);
  margin-bottom: 16px;
  font-weight: 500;
}

/* ---------- Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(251, 251, 250, 0.72);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  transition: background var(--transition), box-shadow var(--transition);
}
.site-header.scrolled {
  background: rgba(255, 255, 255, 0.88);
  box-shadow: 0 1px 0 var(--border), 0 1px 8px rgba(15, 23, 42, .04);
}
.nav-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  position: relative;
}
.brand {
  font-weight: 700;
  font-size: .9375rem;
  text-decoration: none;
  letter-spacing: -0.01em;
  color: var(--text);
}
.brand:hover { color: var(--accent); }

.nav-menu {
  display: flex;
  gap: 28px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-menu a {
  color: var(--muted);
  text-decoration: none;
  font-size: .9375rem;
  font-weight: 500;
  position: relative;
  padding: 4px 0;
  transition: color var(--transition);
}
.nav-menu a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 1.5px;
  background: var(--accent);
  transition: width var(--transition);
}
.nav-menu a:hover { color: var(--text); }
.nav-menu a:hover::after,
.nav-menu a.active::after { width: 100%; }
.nav-menu a.active { color: var(--text); }

.nav-toggle {
  display: none;
  background: none;
  border: 0;
  padding: 8px;
  margin: -8px;
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
  align-items: center;
  justify-content: center;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 1.75px;
  background: var(--text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.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); }

@media (max-width: 720px) {
  .nav-toggle { display: flex; }
  .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: saturate(180%) blur(16px);
    -webkit-backdrop-filter: saturate(180%) blur(16px);
    padding: 8px 24px 20px;
    gap: 4px;
    border-bottom: 1px solid var(--border);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition), opacity var(--transition);
  }
  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-menu li { width: 100%; }
  .nav-menu a {
    display: block;
    padding: 10px 0;
    border-bottom: 1px solid var(--border);
  }
  .nav-menu li:last-child a { border-bottom: 0; }
  .nav-menu a::after { display: none; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: .9375rem;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition), color var(--transition),
              border-color var(--transition), transform var(--transition);
}
.btn:active { transform: translateY(1px); }
.btn svg { width: 16px; height: 16px; flex-shrink: 0; }
.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: var(--accent-hover); }
.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}
.btn-ghost:hover {
  background: var(--accent-soft);
  border-color: var(--border-strong);
}

/* ---------- Hero ---------- */
.hero {
  padding: clamp(56px, 10vw, 112px) 0 clamp(48px, 8vw, 96px);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: center;
}
@media (min-width: 860px) {
  .hero-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 72px;
  }
}
.hero h1 {
  margin-bottom: 20px;
  font-size: clamp(2.5rem, 6vw, 4.25rem);
  letter-spacing: -0.03em;
}
.hero .tagline {
  font-size: clamp(1.0625rem, 1.6vw, 1.25rem);
  color: var(--muted);
  margin-bottom: 36px;
  max-width: 560px;
  line-height: 1.5;
}
.hero .tagline strong {
  color: var(--text);
  font-weight: 600;
}
.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.hero-portrait {
  position: relative;
  justify-self: center;
  width: 100%;
  max-width: 380px;
  aspect-ratio: 4 / 5;
  border-radius: 20px;
  overflow: hidden;
  background: var(--accent-soft);
  box-shadow: 0 20px 60px -20px rgba(29, 78, 216, .28),
              0 0 0 1px rgba(15, 23, 42, .04);
}
.hero-portrait::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 55%, rgba(10, 36, 114, .08) 100%);
  pointer-events: none;
}
.hero-portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ---------- Credential cards ---------- */
.credentials {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: clamp(48px, 6vw, 72px);
}
@media (min-width: 720px) {
  .credentials { grid-template-columns: 1fr 1fr; gap: 20px; }
}
.credential-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 26px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition),
              border-color var(--transition);
  position: relative;
  overflow: hidden;
}
.credential-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--accent);
  transform: scaleY(.5);
  transform-origin: top;
  transition: transform var(--transition);
}
.credential-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}
.credential-card:hover::before { transform: scaleY(1); }
.credential-card .cred-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: .75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--accent);
}
.credential-card .cred-tag::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}
.credential-card h3 {
  font-size: 1.125rem;
  line-height: 1.35;
  letter-spacing: -0.01em;
}
.credential-card .cred-meta {
  color: var(--muted);
  font-size: .9375rem;
  margin: 0;
}

/* ---------- Section card (About, Skills, ...) ---------- */
.section-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: clamp(28px, 4vw, 44px);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}
.section-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent-soft) 100%);
}
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: .75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--accent);
  margin-bottom: 20px;
}
.section-tag::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}
.section-card p {
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.7;
}
.section-card p:last-child { margin-bottom: 0; }
@media (min-width: 720px) {
  .section-card p { font-size: 1.0625rem; }
}
.section-card .pills span {
  background: var(--bg);
}

/* Both About paragraphs share one treatment. Scoped under .section-card so
   they outrank `.section-card p` above, which would otherwise win on specificity. */
.section-card .about-lead,
.section-card .about-tagline {
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.7;
  max-width: 60ch;
}
.section-card .about-lead { margin: 0 0 20px; }
.section-card .about-tagline { margin: 0; }
.about-lead strong,
.about-tagline strong {
  color: var(--text);
  font-weight: 600;
}
@media (min-width: 720px) {
  .section-card .about-lead,
  .section-card .about-tagline { font-size: 1.0625rem; }
}

/* ---------- Skills ---------- */
.skills-groups {
  display: grid;
  gap: 32px;
  grid-template-columns: 1fr;
}
@media (min-width: 720px) {
  .skills-groups { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
}
.skill-group h3 {
  font-size: .8125rem;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--muted);
  margin-bottom: 14px;
  font-weight: 600;
}
.pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.pills span {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: .8125rem;
  color: var(--text);
  font-weight: 500;
  transition: border-color var(--transition), color var(--transition),
              background var(--transition);
}
.pills span:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.pills.compact span {
  padding: 3px 10px;
  font-size: .75rem;
  background: var(--accent-soft);
  border-color: transparent;
  color: var(--accent);
  font-weight: 500;
}
.pills.compact span:hover {
  background: var(--border);
  color: var(--accent-hover);
}

/* ---------- Timeline ---------- */
.timeline {
  list-style: none;
  margin: 0 0 0 8px;
  padding: 0;
  border-left: 1.5px solid var(--border);
}
.timeline-item {
  position: relative;
  padding: 0 0 40px 28px;
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-dot {
  position: absolute;
  left: -7px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
}
.timeline-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 16px;
  margin-bottom: 10px;
}
.timeline-meta h3 {
  font-size: 1.0625rem;
  flex-shrink: 0;
}
.timeline-meta .org {
  color: var(--muted);
  font-size: .9375rem;
}
.timeline-meta .dates {
  margin-left: auto;
  font-size: .8125rem;
  color: var(--muted-2);
  font-variant-numeric: tabular-nums;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: .04em;
}
@media (max-width: 720px) {
  .timeline-meta .dates { margin-left: 0; }
}
.timeline-content ul {
  margin: 8px 0 0;
  padding-left: 18px;
  color: var(--muted);
}
.timeline-content ul li {
  margin-bottom: 6px;
  font-size: .9375rem;
}
.timeline-content ul li:last-child { margin-bottom: 0; }

/* ---------- Projects ---------- */
.section-intro {
  margin: -16px 0 32px;
  max-width: 700px;
  color: var(--muted);
}
.section-intro a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid var(--border-strong);
  transition: border-color var(--transition);
}
.section-intro a:hover { border-color: var(--accent); }

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 18px;
}
.project-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition),
              border-color var(--transition);
}
.project-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}
.project-card h3 {
  font-size: 1.0625rem;
  margin: 0;
}
.project-card .desc {
  margin: 0;
  color: var(--muted);
  font-size: .9375rem;
  flex: 1;
}
.card-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 4px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}
.card-links a {
  color: var(--accent);
  text-decoration: none;
  font-size: .8125rem;
  font-weight: 600;
  letter-spacing: .02em;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color var(--transition), gap var(--transition);
}
.card-links a:hover {
  color: var(--accent-hover);
  gap: 8px;
}
.card-links a svg { width: 14px; height: 14px; }

/* ---------- Activities ---------- */
.activities-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
}
@media (min-width: 720px) {
  .activities-grid { grid-template-columns: 1fr 1fr; }
}
.activity-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition),
              border-color var(--transition);
}
.activity-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}
.activity-card h3 { margin-bottom: 4px; }
.activity-card .meta {
  font-size: .8125rem;
  color: var(--muted);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: .04em;
  font-weight: 500;
}
.activity-card p {
  color: var(--muted);
  font-size: .9375rem;
  margin: 0;
}

/* ---------- Activity card with role progression ---------- */
.activity-card.progression .org-header h3 {
  margin-bottom: 2px;
}
.activity-card.progression .org-meta {
  font-size: .8125rem;
  color: var(--muted);
  margin: 0 0 20px;
  text-transform: uppercase;
  letter-spacing: .04em;
  font-weight: 500;
}

.role-timeline {
  position: relative;
  padding-left: 26px;
}
.role-timeline::before {
  content: '';
  position: absolute;
  left: 5px;
  top: 7px;
  bottom: 7px;
  width: 1.5px;
  background: var(--border);
}

.role-entry {
  position: relative;
  padding-bottom: 20px;
}
.role-entry:last-child { padding-bottom: 0; }

.timeline-marker {
  position: absolute;
  left: -26px;
  top: 5px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
}
.role-entry.past .timeline-marker {
  border-color: var(--border-strong);
}

.role-content h4 {
  margin: 0;
  font-size: .9375rem;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--text);
}
.role-dates {
  display: block;
  margin-bottom: 6px;
  font-size: .75rem;
  color: var(--muted-2);
  font-variant-numeric: tabular-nums;
  text-transform: uppercase;
  letter-spacing: .04em;
  font-weight: 500;
}
.role-content p {
  margin: 0;
  color: var(--muted);
  font-size: .9375rem;
}

/* ---------- Education ---------- */
.education-list {
  display: grid;
  gap: 18px;
}
.education-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 28px;
  display: grid;
  gap: 16px;
  box-shadow: var(--shadow-sm);
}
@media (min-width: 720px) {
  .education-item {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.5fr);
    gap: 32px;
    align-items: start;
  }
}
.education-item h3 { margin-bottom: 6px; }
.edu-meta .org {
  color: var(--muted);
  font-size: .9375rem;
  margin-bottom: 4px;
}
.edu-meta .dates {
  font-size: .8125rem;
  color: var(--muted-2);
  text-transform: uppercase;
  letter-spacing: .04em;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}
.edu-detail {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
}
.edu-detail li {
  margin-bottom: 6px;
  font-size: .9375rem;
}
.edu-detail li:last-child { margin-bottom: 0; }

/* ---------- Contact ---------- */
#contact {
  background: linear-gradient(180deg, transparent 0%, rgba(241, 245, 249, 0.5) 100%);
}
.contact-text {
  color: var(--muted);
  font-size: 1.0625rem;
  max-width: 600px;
  margin-bottom: 28px;
}
.contact-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- Footer ---------- */
footer {
  padding: 32px 0;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--muted-2);
  font-size: .8125rem;
}

/* ---------- Reveal on scroll ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 600ms cubic-bezier(.4, 0, .2, 1),
              transform 600ms cubic-bezier(.4, 0, .2, 1);
}
[data-reveal].in-view {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Focus ---------- */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}
.pills span:focus-visible,
.btn:focus-visible { outline-offset: 3px; }

/* ---------- Reduced 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;
  }
  [data-reveal] {
    opacity: 1;
    transform: none;
  }
  html { scroll-behavior: auto; }
}