:root {
  --bg: #f6f7f9;
  --bg-alt: #ffffff;
  --surface: #ffffff;
  --surface-strong: #eef1f6;
  --text: #12161f;
  --muted: #5b6575;
  --border: #dfe4ec;
  --accent: #0b63ce;
  --accent-soft: rgba(11, 99, 206, .10);
  --accent-contrast: #ffffff;
  --shadow: 0 18px 50px rgba(16, 24, 40, .08);
  --radius: 18px;
  --radius-sm: 12px;
  --max: 1120px;
  --header-h: 68px;
  color-scheme: light;
}

[data-theme="dark"] {
  --bg: #0a0e16;
  --bg-alt: #0e1420;
  --surface: #121a29;
  --surface-strong: #172134;
  --text: #e9eef7;
  --muted: #9aa7bb;
  --border: #223049;
  --accent: #6ba8ff;
  --accent-soft: rgba(107, 168, 255, .14);
  --accent-contrast: #07101f;
  --shadow: 0 18px 50px rgba(0, 0, 0, .35);
  color-scheme: dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0a0e16;
    --bg-alt: #0e1420;
    --surface: #121a29;
    --surface-strong: #172134;
    --text: #e9eef7;
    --muted: #9aa7bb;
    --border: #223049;
    --accent: #6ba8ff;
    --accent-soft: rgba(107, 168, 255, .14);
    --accent-contrast: #07101f;
    --shadow: 0 18px 50px rgba(0, 0, 0, .35);
    color-scheme: dark;
  }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  text-decoration-thickness: 2px;
}

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

h1,
h2,
h3 {
  line-height: 1.15;
  letter-spacing: -.025em;
  margin: 0 0 .5em;
}

h1 {
  font-size: clamp(2.4rem, 7vw, 4.6rem);
  font-weight: 800;
}

h2 {
  font-size: clamp(1.7rem, 4vw, 2.5rem);
  font-weight: 750;
}

h3 {
  font-size: 1.08rem;
  font-weight: 700;
}

p {
  margin: 0 0 1rem;
}

.container {
  width: min(100% - 40px, var(--max));
  margin-inline: auto;
}

.sr-only,
.skip-link:not(:focus) {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 100;
  padding: .7rem 1rem;
  background: var(--accent);
  color: var(--accent-contrast);
  border-radius: 8px;
  font-weight: 700;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(14px);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .65rem;
  color: var(--text);
  text-decoration: none;
  font-weight: 750;
  letter-spacing: -.02em;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--accent);
  color: var(--accent-contrast);
  font-size: .85rem;
  font-weight: 800;
  letter-spacing: 0;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: .25rem;
}

.site-nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: .93rem;
  font-weight: 600;
  padding: .55rem .7rem;
  border-radius: 9px;
}

.site-nav a:hover {
  color: var(--text);
  background: var(--accent-soft);
}

.theme-toggle {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  margin-left: .35rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
}

.theme-toggle:hover {
  background: var(--surface-strong);
}

.theme-icon {
  width: 17px;
  height: 17px;
  border-radius: 50%;
  background: linear-gradient(90deg, var(--text) 50%, transparent 50%);
  border: 2px solid var(--text);
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  cursor: pointer;
}

.menu-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  margin: 4px 0;
  background: var(--text);
  border-radius: 2px;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(3.5rem, 9vw, 7rem) 0 clamp(3rem, 7vw, 5.5rem);
  background:
    radial-gradient(900px 520px at 88% 6%, var(--accent-soft), transparent 65%),
    radial-gradient(700px 420px at 0% 100%, color-mix(in srgb, var(--accent) 8%, transparent), transparent 60%);
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(220px, .65fr);
  gap: clamp(2rem, 6vw, 5rem);
  align-items: center;
}

.eyebrow {
  margin: 0 0 .85rem;
  color: var(--accent);
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.hero h1 {
  margin-bottom: .35em;
}

.lead {
  max-width: 34ch;
  font-size: clamp(1.08rem, 2vw, 1.35rem);
  color: var(--muted);
}

.hero-meta {
  color: var(--muted);
  font-size: .95rem;
}

.hero-actions,
.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: 1.6rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: .7rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: 11px;
  background: var(--surface);
  color: var(--text);
  font-size: .95rem;
  font-weight: 700;
  text-decoration: none;
  transition: transform .15s ease, background-color .15s ease, border-color .15s ease;
}

.button:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
  text-decoration: none;
}

.button-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-contrast);
}

.button-primary:hover {
  background: color-mix(in srgb, var(--accent) 88%, black);
}

.button-ghost {
  background: transparent;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin: 1.6rem 0 0;
  padding: 0;
  list-style: none;
}

.chips li {
  padding: .35rem .7rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  font-size: .82rem;
  font-weight: 650;
}

.chips span {
  color: var(--muted);
  font-weight: 500;
}

.hero-portrait {
  justify-self: center;
  width: min(100%, 340px);
}

.hero-portrait img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 28% 72% 70% 30% / 30% 30% 70% 70%;
  border: 6px solid var(--surface);
  box-shadow: var(--shadow);
}

.section {
  padding: clamp(3.5rem, 8vw, 6rem) 0;
}

.section-alt {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-heading {
  max-width: 720px;
  margin-bottom: clamp(1.8rem, 4vw, 3rem);
}

.section-heading h2 {
  margin-bottom: .3em;
}

.section-intro {
  color: var(--muted);
  margin-bottom: 0;
}

.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(260px, .5fr);
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}

.prose p:last-child {
  margin-bottom: 0;
}

.fact-card {
  padding: 1.4rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.fact-card dl {
  margin: 0;
}

.fact-card dl > div {
  padding: .75rem 0;
  border-bottom: 1px solid var(--border);
}

.fact-card dl > div:first-child {
  padding-top: 0;
}

.fact-card dl > div:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.fact-card dt {
  color: var(--muted);
  font-size: .74rem;
  font-weight: 800;
  letter-spacing: .1em;
  text-transform: uppercase;
}

.fact-card dd {
  margin: .15rem 0 0;
  font-weight: 650;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.card-grid-four {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.card {
  padding: 1.4rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}

.card:hover {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
  box-shadow: var(--shadow);
}

.card h3 {
  margin-bottom: .45rem;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: .94rem;
}

.cert-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .9rem;
}

.cert {
  display: grid;
  gap: .18rem;
  padding: 1.1rem 1.2rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-sm);
  color: var(--text);
  text-decoration: none;
  transition: transform .15s ease, border-color .15s ease, box-shadow .15s ease;
}

.cert:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  box-shadow: var(--shadow);
  text-decoration: none;
}

.cert-year {
  color: var(--accent);
  font-size: .74rem;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.cert-name {
  font-weight: 700;
  line-height: 1.35;
}

.cert-issuer {
  color: var(--muted);
  font-size: .85rem;
}

.subheading {
  margin: 2.4rem 0 1rem;
  padding-top: 1.6rem;
  border-top: 1px solid var(--border);
  font-size: 1.25rem;
}

.history-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.history-list li {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 1rem;
  padding: .7rem 0;
  border-bottom: 1px solid var(--border);
  color: var(--muted);
}

.history-list li:last-child {
  border-bottom: 0;
}

.history-list span {
  color: var(--text);
  font-weight: 700;
  font-size: .88rem;
}

.contact-section {
  background:
    radial-gradient(700px 380px at 100% 0%, var(--accent-soft), transparent 70%),
    var(--bg);
}

.contact-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, .8fr);
  gap: clamp(1.5rem, 5vw, 4rem);
  align-items: center;
}

.contact-actions {
  margin-top: 0;
  justify-content: flex-end;
}

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-alt);
  color: var(--muted);
  font-size: .88rem;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: .5rem 2rem;
  padding-block: 1.6rem;
}

.footer-inner p {
  margin: 0;
}

@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
  }

  .hero-portrait {
    order: -1;
    width: min(60%, 260px);
  }

  .about-grid,
  .contact-inner {
    grid-template-columns: 1fr;
  }

  .card-grid,
  .card-grid-four {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .contact-actions {
    justify-content: flex-start;
  }
}

@media (max-width: 720px) {
  :root {
    --header-h: 62px;
  }

  body {
    font-size: 16px;
  }

  .container {
    width: min(100% - 28px, var(--max));
  }

  .menu-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: calc(var(--header-h) + 8px);
    right: 14px;
    left: 14px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: .15rem;
    padding: .6rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    padding: .7rem .8rem;
  }

  .theme-toggle {
    margin: .4rem 0 0;
    width: 100%;
    justify-content: center;
  }

  .hero {
    padding-top: 2.5rem;
  }

  .hero-portrait {
    width: min(55%, 210px);
  }

  .card-grid,
  .card-grid-four,
  .cert-grid {
    grid-template-columns: 1fr;
  }

  .history-list li {
    grid-template-columns: 1fr;
    gap: .1rem;
  }

  .button {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}