:root {
  --blue: #0078D4;
  --blue-dark: #005A9E;
  --blue-deep: #0B2545;
  --blue-tint: #E5F1FB;
  --amber: #F2A900;
  --ink: #111827;
  --ink-soft: #4B5563;
  --line: #E5E7EB;
  --bg: #FFFFFF;
  --bg-soft: #F7F9FC;
  --bg-dark: #0B2545;
  --bg-dark-2: #0E2C56;
  --card-bg: #FFFFFF;
  --header-bg: rgba(255, 255, 255, .85);
  --hero-grad-1: #FFFFFF;
  --hero-grad-2: #F4F8FC;
  --radius: 14px;
  --radius-sm: 10px;
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, .06), 0 1px 3px rgba(16, 24, 40, .08);
  --shadow-md: 0 8px 24px rgba(16, 24, 40, .08), 0 2px 6px rgba(16, 24, 40, .05);
  --shadow-lg: 0 24px 48px rgba(11, 37, 69, .18);
  --maxw: 1120px;
}

[data-theme="dark"] {
  --blue: #4DA9E8;
  --blue-dark: #7BC4F0;
  --blue-deep: #E6EEF8;
  --blue-tint: rgba(77, 169, 232, .14);
  --ink: #E6EEF8;
  --ink-soft: #9AAEC6;
  --line: rgba(255, 255, 255, .08);
  --bg: #0A1426;
  --bg-soft: #11203B;
  --bg-dark: #060E1C;
  --bg-dark-2: #0A1730;
  --card-bg: #122244;
  --header-bg: rgba(10, 20, 38, .85);
  --hero-grad-1: #0A1426;
  --hero-grad-2: #0E1B33;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, .35), 0 1px 3px rgba(0, 0, 0, .25);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, .35), 0 2px 6px rgba(0, 0, 0, .25);
  --shadow-lg: 0 24px 48px rgba(0, 0, 0, .55);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; color-scheme: light; }
html[data-theme="dark"] { color-scheme: dark; }

body {
  margin: 0;
  font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color .25s ease, color .25s ease;
}

img, svg { display: block; max-width: 100%; }

a { color: var(--blue-dark); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  width: min(100% - 2rem, var(--maxw));
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--blue);
  color: #fff;
  padding: .75rem 1rem;
  border-radius: 0 0 var(--radius-sm) 0;
  z-index: 1000;
}
.skip-link:focus { left: 0; }

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--header-bg);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .9rem 0;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .65rem;
  color: var(--ink);
  font-weight: 700;
}
.brand:hover { text-decoration: none; }

.brand-mark {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  background: var(--blue);
  color: #fff;
  border-radius: 9px;
  font-weight: 800;
  letter-spacing: .5px;
  box-shadow: var(--shadow-sm);
}

.brand-name { font-size: 1rem; letter-spacing: .2px; }

.nav-links {
  display: flex;
  gap: 1.6rem;
}
.nav-links a {
  color: var(--ink-soft);
  font-weight: 500;
  font-size: .95rem;
}
.nav-links a:hover { color: var(--blue-dark); text-decoration: none; }

.nav-actions {
  display: flex;
  align-items: center;
  gap: .55rem;
}

.theme-toggle {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink-soft);
  cursor: pointer;
  transition: background .15s ease, color .15s ease, border-color .15s ease, transform .15s ease;
}
.theme-toggle:hover {
  color: var(--blue-dark);
  border-color: var(--blue);
  background: var(--blue-tint);
}
.theme-toggle:active { transform: scale(.96); }
.theme-toggle .icon-sun  { display: none; }
.theme-toggle .icon-moon { display: block; }
[data-theme="dark"] .theme-toggle .icon-sun  { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 8px;
  cursor: pointer;
  padding: 0 9px;
}
.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--ink);
  transition: transform .2s ease, opacity .2s ease;
}

.mobile-menu {
  display: none;
  flex-direction: column;
  gap: .25rem;
  padding: .5rem 1rem 1rem;
  border-top: 1px solid var(--line);
  background: var(--card-bg);
}
.mobile-menu a {
  padding: .85rem .5rem;
  color: var(--ink);
  border-bottom: 1px solid var(--line);
}
.mobile-menu a:last-child { border-bottom: 0; }

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: .85rem 1.4rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: .98rem;
  border: 1px solid transparent;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease, color .15s ease;
  cursor: pointer;
}
.btn-primary {
  background: var(--blue);
  color: #fff;
  box-shadow: 0 6px 16px rgba(0, 120, 212, .35);
}
.btn-primary:hover { background: var(--blue-dark); transform: translateY(-1px); text-decoration: none; }
.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}
.btn-ghost:hover { background: var(--bg-soft); text-decoration: none; }

/* ---------- hero ---------- */
.hero {
  position: relative;
  padding: 5rem 0 4rem;
  background:
    radial-gradient(ellipse at 80% -10%, rgba(0,120,212,.18), transparent 55%),
    radial-gradient(ellipse at -10% 60%, rgba(242,169,0,.10), transparent 55%),
    linear-gradient(180deg, var(--hero-grad-1) 0%, var(--hero-grad-2) 100%);
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 4rem;
  align-items: center;
}

.eyebrow {
  display: inline-block;
  text-transform: uppercase;
  letter-spacing: .14em;
  font-size: .78rem;
  font-weight: 700;
  color: var(--blue-dark);
  background: var(--blue-tint);
  padding: .35rem .65rem;
  border-radius: 999px;
  margin: 0 0 1.1rem;
}

h1 {
  font-size: clamp(2.5rem, 6vw, 4.25rem);
  line-height: 1.05;
  letter-spacing: -.02em;
  margin: 0 0 1.2rem;
  font-weight: 800;
  color: var(--blue-deep);
}
.hero-accent {
  background: linear-gradient(120deg, var(--blue) 0%, #00A2ED 50%, var(--amber) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lede {
  font-size: 1.18rem;
  color: var(--ink-soft);
  max-width: 38rem;
  margin: 0 0 1.8rem;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: .8rem;
  margin-bottom: 2.2rem;
}

.hero-meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.2rem;
  margin: 0;
  padding-top: 1.4rem;
  border-top: 1px dashed var(--line);
}
.hero-meta div { margin: 0; }
.hero-meta dt {
  font-size: .72rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: .25rem;
  font-weight: 600;
}
.hero-meta dd {
  margin: 0;
  font-weight: 600;
  color: var(--ink);
}

/* hero art */
.hero-art { display: flex; justify-content: center; }

.badge-card {
  width: 100%;
  max-width: 420px;
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 1.6rem;
  box-shadow: var(--shadow-lg);
  display: grid;
  gap: 1.4rem;
  position: relative;
  transform: rotate(-1.2deg);
}
.badge-card::after {
  content: "";
  position: absolute;
  inset: -10px;
  border-radius: 26px;
  background: linear-gradient(135deg, rgba(0,120,212,.10), rgba(242,169,0,.10));
  z-index: -1;
  filter: blur(12px);
}
.badge-seal { display: flex; justify-content: center; }

.badge-tiles {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .7rem;
}
.tile {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: .9rem;
  display: flex;
  flex-direction: column;
  gap: .15rem;
}
.tile-num {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--blue-deep);
  line-height: 1;
}
.tile-label {
  font-size: .78rem;
  color: var(--ink-soft);
  font-weight: 500;
}
.tile-accent {
  background: linear-gradient(135deg, var(--blue) 0%, #00A2ED 100%);
  border-color: transparent;
}
.tile-accent .tile-num,
.tile-accent .tile-label { color: #fff; }
.tile-accent .tile-label { opacity: .92; }

@media (max-width: 900px) {
  .hero { padding: 3.5rem 0 3rem; }
  .hero-grid { grid-template-columns: 1fr; gap: 2.4rem; }
  .badge-card { transform: none; }
}
@media (max-width: 540px) {
  .hero-meta { grid-template-columns: 1fr; gap: .9rem; }
}

/* ---------- sections ---------- */
.section {
  padding: 5.5rem 0;
}
.section.slim { padding: 3rem 0; }

.section-light { background: var(--bg); }
.section-light + .section-light { border-top: 1px solid var(--line); }
.section-dark {
  background: linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-dark-2) 100%);
  color: #E6EEF8;
}
.section-dark .eyebrow {
  background: rgba(255,255,255,.10);
  color: #9CC8F0;
}
.section-dark h2,
.section-dark .section-lede,
.section-dark h3 { color: #fff; }
.section-dark .section-lede { color: #B7C7DB; }

.section-head {
  max-width: 720px;
  margin: 0 auto 3rem;
  text-align: center;
}
h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  line-height: 1.15;
  letter-spacing: -.015em;
  margin: 0 0 .8rem;
  color: var(--blue-deep);
  font-weight: 800;
}
.section-lede {
  font-size: 1.08rem;
  color: var(--ink-soft);
  margin: 0;
}

/* ---------- cards (achievement) ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.4rem;
  align-items: stretch;
}
.card {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.6rem;
  box-shadow: var(--shadow-sm);
  transition: transform .2s ease, box-shadow .2s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.card h3 {
  margin: 0 0 .8rem;
  font-size: 1.15rem;
  color: var(--blue-deep);
}
.card p { margin: 0 0 .8rem; color: var(--ink-soft); }
.card .muted { color: #9AA3B2; font-size: .85rem; }

.card-feature {
  background: linear-gradient(160deg, var(--blue) 0%, #005A9E 100%);
  color: #fff;
  border-color: transparent;
}
.card-feature h3 { color: #fff; }
.card-feature blockquote {
  margin: 0 0 1rem;
  font-size: 1.05rem;
  line-height: 1.55;
  color: #fff;
  border-left: 3px solid rgba(255,255,255,.55);
  padding-left: .9rem;
}
.card-feature .quote-attribution {
  margin: 0;
  font-size: .9rem;
  color: rgba(255,255,255,.92);
}
.card-feature .quote-attribution span { color: rgba(255,255,255,.7); font-weight: 400; }

.meta-list {
  list-style: none;
  margin: 0 0 1.1rem;
  padding: 0;
  display: grid;
  gap: .55rem;
}

.verify-link {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  font-size: .88rem;
  font-weight: 600;
  color: var(--blue-dark);
  background: var(--blue-tint);
  padding: .5rem .85rem;
  border-radius: 999px;
  border: 1px solid rgba(0, 120, 212, .18);
  transition: background .15s ease, transform .15s ease;
}
.verify-link:hover {
  background: rgba(0, 120, 212, .22);
  text-decoration: none;
  transform: translateY(-1px);
}
.verify-link svg { flex-shrink: 0; }
.meta-list li {
  display: flex;
  justify-content: space-between;
  font-size: .92rem;
  border-bottom: 1px dashed var(--line);
  padding-bottom: .5rem;
}
.meta-list li:last-child { border-bottom: 0; padding-bottom: 0; }
.meta-list span { color: var(--ink-soft); }
.meta-list strong { color: var(--ink); font-weight: 600; }

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

/* ---------- certificate ---------- */
.cert-frame {
  margin: 0 auto;
  max-width: 920px;
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px;
  box-shadow: var(--shadow-lg);
  position: relative;
}
.cert-frame::after {
  content: "";
  position: absolute;
  inset: -14px;
  border-radius: 22px;
  background: linear-gradient(135deg, rgba(0,120,212,.10), rgba(242,169,0,.10));
  z-index: -1;
  filter: blur(14px);
}
.cert-frame a {
  display: block;
  border-radius: 8px;
  overflow: hidden;
  transition: transform .25s ease;
}
.cert-frame a:hover { transform: scale(1.005); }
.cert-frame img {
  width: 100%;
  height: auto;
  display: block;
  background: #0B2545;
  border-radius: 6px;
}
.cert-frame figcaption {
  margin-top: .9rem;
  text-align: center;
  font-size: .88rem;
  color: var(--ink-soft);
}

.cert-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: .8rem;
  margin-top: 1.8rem;
}

/* ---------- timeline ---------- */
.timeline {
  list-style: none;
  margin: 0 auto;
  padding: 0;
  max-width: 760px;
  position: relative;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 22px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, rgba(255,255,255,.3), rgba(255,255,255,.05));
}
.timeline li {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 1.2rem;
  padding: 1rem 0 1.6rem;
  position: relative;
}
.t-marker {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--amber);
  color: #1A1300;
  font-weight: 800;
  display: grid;
  place-items: center;
  box-shadow: 0 0 0 6px rgba(242,169,0,.18);
  z-index: 1;
}
.t-body h3 {
  font-size: 1.1rem;
  margin: .2rem 0 .35rem;
}
.t-body p { color: #B7C7DB; margin: 0; }

/* ---------- project ---------- */
.projects {
  display: grid;
  gap: 1.4rem;
  max-width: 820px;
  margin: 0 auto;
}
.project {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  transition: transform .2s ease, box-shadow .2s ease;
}
.project:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.project-tag {
  display: inline-block;
  font-size: .72rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--blue-dark);
  background: var(--blue-tint);
  padding: .3rem .6rem;
  border-radius: 999px;
  font-weight: 700;
  margin: 0 0 .65rem;
}
.project-head h3 {
  margin: 0 0 .25rem;
  font-size: 1.35rem;
  color: var(--blue-deep);
}
.project-meta {
  margin: 0 0 1.2rem;
  color: var(--ink-soft);
  font-size: .95rem;
}
.project-body p { color: var(--ink-soft); }
.checks {
  list-style: none;
  margin: 1rem 0 1.4rem;
  padding: 0;
  display: grid;
  gap: .55rem;
}
.checks li {
  position: relative;
  padding-left: 1.6rem;
  color: var(--ink);
}
.checks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .55em;
  width: 14px;
  height: 8px;
  border-left: 2px solid var(--blue);
  border-bottom: 2px solid var(--blue);
  transform: rotate(-45deg);
}
.project-attribution {
  margin: 1rem 0 0;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: .92rem;
}

.tech-stack {
  list-style: none;
  margin: 1.1rem 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
}
.tech-stack li {
  font-size: .78rem;
  font-weight: 600;
  color: var(--blue-deep);
  background: var(--blue-tint);
  border: 1px solid rgba(0, 120, 212, .18);
  padding: .35rem .7rem;
  border-radius: 999px;
  letter-spacing: .01em;
}

/* ---------- press ---------- */
.press-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.4rem;
}
.press-card {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.6rem;
  box-shadow: var(--shadow-sm);
}
.press-card h3 {
  margin: .2rem 0 .6rem;
  font-size: 1.2rem;
  color: var(--blue-deep);
}
.press-card p { margin: 0; color: var(--ink-soft); }
.press-date {
  font-size: .82rem;
  color: var(--blue-dark);
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
}
@media (max-width: 760px) {
  .press-grid { grid-template-columns: 1fr; }
}

/* ---------- education ---------- */
.edu {
  text-align: center;
}
.edu h2 { margin-bottom: .25rem; }
.edu p { color: #B7C7DB; margin: 0; }

/* ---------- contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  max-width: 1000px;
  margin: 0 auto;
}
.contact-card {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  padding: 1.4rem 1.5rem;
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
  transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
  box-shadow: var(--shadow-sm);
}
a.contact-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--blue);
  text-decoration: none;
}
.contact-label {
  font-size: .75rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  font-weight: 700;
}
.contact-value {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--blue-deep);
  word-break: break-word;
}

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.8rem 0;
  background: var(--bg-soft);
}
.footer-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}
.site-footer p { margin: 0; color: var(--ink-soft); font-size: .9rem; }
.muted { color: #9AA3B2; }

/* ---------- reveal animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .6s ease, transform .6s ease;
  will-change: opacity, transform;
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ---------- print ---------- */
@media print {
  .site-header, .nav-toggle, .hero-cta, .site-footer { display: none; }
  .section { padding: 1rem 0; }
  .hero { padding: 1rem 0; background: #fff; }
  .badge-card { box-shadow: none; transform: none; }
  body { color: #000; }
}