:root {
  --background: #ffffff;
  --surface: #f8fafc;
  --text: #111827;
  --muted: #4b5563;
  --subtle: #6b7280;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --accent-soft: #eff6ff;
  --border: #e5e7eb;
  --border-strong: #d1d5db;
  --shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
  --radius: 14px;
  --container: 1160px;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 84px; }

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

body.menu-open { overflow: hidden; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-underline-offset: 3px; }
button, a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid rgba(37, 99, 235, 0.42); outline-offset: 3px; }

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 1000;
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--text);
  color: #fff;
  transform: translateY(-150%);
  transition: transform 150ms ease;
}
.skip-link:focus { transform: translateY(0); }

.container { width: min(calc(100% - 40px), var(--container)); margin-inline: auto; }
.section { padding: 82px 0; }
.section-tinted { border-block: 1px solid var(--border); background: var(--surface); }
.section-narrow { max-width: 940px; }
.section-heading { margin-bottom: 34px; }
.section-heading-row { display: flex; align-items: end; justify-content: space-between; gap: 36px; }
.section-heading-row > p { max-width: 510px; margin: 0 0 5px; color: var(--muted); }

.section-label, .eyebrow, .credential-type {
  margin: 0 0 5px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 750;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

h1, h2, h3, p { overflow-wrap: break-word; }
h1, h2, h3 { margin-top: 0; color: var(--text); line-height: 1.2; letter-spacing: -0.025em; }
h1 { margin-bottom: 10px; font-size: clamp(2.55rem, 5vw, 4.25rem); }
h2 { margin-bottom: 0; font-size: clamp(2rem, 3.5vw, 2.75rem); }
h3 { font-size: 1.23rem; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid rgba(229, 231, 235, 0.9);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(10px);
}
.nav { display: flex; min-height: 70px; align-items: center; justify-content: space-between; }
.brand { flex: none; color: var(--text); font-size: 1.03rem; font-weight: 760; text-decoration: none; }
.nav-menu { display: flex; align-items: center; gap: 24px; }
.nav-menu > a { color: var(--muted); font-size: 0.9rem; font-weight: 580; text-decoration: none; }
.nav-menu > a:hover, .nav-menu > a:focus-visible, .footer-links a:hover { color: var(--accent); }
.nav-socials { display: flex; gap: 7px; margin-left: 2px; padding-left: 16px; border-left: 1px solid var(--border); }
.icon-link { display: grid; width: 32px; height: 32px; place-items: center; border: 1px solid var(--border); border-radius: 8px; background: #fff; }
.icon-link svg { width: 16px; height: 16px; fill: var(--muted); }
.icon-link:hover { border-color: #bfdbfe; background: var(--accent-soft); }
.icon-link:hover svg { fill: var(--accent); }

.menu-toggle { display: none; width: 42px; height: 42px; padding: 10px; border: 1px solid var(--border); border-radius: 9px; background: #fff; cursor: pointer; }
.menu-toggle span { display: block; width: 100%; height: 2px; margin: 4px 0; border-radius: 2px; background: var(--text); transition: transform 160ms ease, opacity 160ms ease; }

.hero {
  display: grid;
  min-height: 610px;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 375px);
  align-items: center;
  gap: clamp(48px, 8vw, 108px);
  padding-block: 70px;
}
.hero-copy { max-width: 700px; }
.hero-role { margin: 0 0 18px; color: var(--accent); font-size: clamp(1.2rem, 2.2vw, 1.55rem); font-weight: 650; }
.hero-description { max-width: 650px; margin: 0; color: var(--muted); font-size: 1.1rem; line-height: 1.75; }
.hero-actions, .contact-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 11px; margin-top: 30px; }

.button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 17px;
  border: 1px solid transparent;
  border-radius: 9px;
  font-size: 0.93rem;
  font-weight: 650;
  line-height: 1.2;
  text-decoration: none;
  transition: border-color 150ms ease, background-color 150ms ease, color 150ms ease, transform 150ms ease;
}
.button:hover { transform: translateY(-1px); }
.button-primary { border-color: var(--accent); background: var(--accent); color: #fff; }
.button-primary:hover { border-color: var(--accent-dark); background: var(--accent-dark); }
.button-secondary { border-color: var(--border-strong); background: #fff; color: var(--text); }
.button-secondary:hover { border-color: #93c5fd; color: var(--accent-dark); }
.button-text { min-height: 40px; padding-inline: 8px; color: var(--muted); }
.button-text:hover { color: var(--accent); }

.hero-portrait { position: relative; }
.hero-portrait::before { position: absolute; inset: 16px -16px -16px 16px; z-index: -1; border: 1px solid #bfdbfe; border-radius: 18px; background: var(--accent-soft); content: ""; }
.hero-portrait img { width: 100%; height: auto; aspect-ratio: 4 / 5; object-fit: cover; object-position: center 53%; border: 1px solid var(--border); border-radius: 16px; background: var(--surface); box-shadow: var(--shadow); }

.about-copy { max-width: 810px; color: var(--muted); font-size: 1.06rem; }
.about-copy p { margin: 0 0 14px; }
.about-copy p:last-child { margin-bottom: 0; }

.timeline { position: relative; display: grid; gap: 22px; }
.experience-item { display: grid; grid-template-columns: 190px 1fr; gap: 34px; padding: 28px; border: 1px solid var(--border); border-radius: var(--radius); background: #fff; }
.experience-meta { color: var(--subtle); font-size: 0.89rem; }
.experience-meta p { margin: 0 0 4px; }
.experience-date { color: var(--text); font-weight: 650; }
.experience-content h3 { margin-bottom: 3px; }
.company { margin: 0 0 14px; color: var(--accent-dark); font-weight: 630; }
.experience-content ul { display: grid; gap: 7px; margin: 0; padding-left: 20px; color: var(--muted); }
.experience-content li::marker { color: var(--accent); }

.project-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; align-items: stretch; }
.project-card { display: flex; min-width: 0; flex-direction: column; overflow: hidden; border: 1px solid var(--border); border-radius: var(--radius); background: #fff; box-shadow: 0 6px 16px rgba(15, 23, 42, 0.04); transition: border-color 160ms ease, box-shadow 160ms ease, transform 160ms ease; }
.project-card:hover { border-color: #cbd5e1; box-shadow: 0 12px 26px rgba(15, 23, 42, 0.08); transform: translateY(-2px); }
.project-image, .project-placeholder { width: 100%; aspect-ratio: 16 / 9; border-bottom: 1px solid var(--border); background: #e5e7eb; }
.project-image { height: auto; object-fit: cover; object-position: top center; }
.project-placeholder { display: grid; place-items: center; align-content: center; gap: 10px; color: #334155; background: #eef2f7; }
.project-placeholder svg { width: 54px; height: 54px; fill: none; stroke: #64748b; stroke-linecap: round; stroke-linejoin: round; stroke-width: 2.4; }
.project-placeholder span { padding-inline: 20px; font-size: 0.92rem; font-weight: 700; text-align: center; }
.placeholder-local { background: #f1f5f9; }
.placeholder-system { background: #eff6ff; }
.placeholder-system svg { stroke: #3b82f6; }
.project-content { display: flex; flex: 1; flex-direction: column; padding: 22px; }
.project-content h3 { margin-bottom: 9px; }
.project-content > p { margin: 0 0 16px; color: var(--muted); font-size: 0.94rem; line-height: 1.62; }
.project-content .evidence { margin-top: -6px; margin-bottom: 14px; color: var(--accent-dark); font-size: 0.79rem; font-weight: 680; }

.tag-list { display: flex; flex-wrap: wrap; gap: 7px; margin: 0; padding: 0; list-style: none; }
.tag-list li { padding: 4px 9px; border: 1px solid #dbeafe; border-radius: 999px; background: var(--accent-soft); color: #1e40af; font-size: 0.72rem; font-weight: 620; line-height: 1.35; }
.project-links { display: flex; flex-wrap: wrap; gap: 15px; margin-top: auto; padding-top: 20px; border-top: 1px solid var(--border); }
.project-links a { color: var(--accent-dark); font-size: 0.85rem; font-weight: 680; text-decoration: none; }
.project-links a:hover { text-decoration: underline; }

.skills-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.skill-group { padding: 24px; border: 1px solid var(--border); border-radius: 12px; background: #fff; }
.skill-group-wide { grid-column: span 2; }
.skill-group h3 { margin-bottom: 16px; font-size: 1.04rem; }
.skill-group .tag-list li { border-color: var(--border); background: var(--surface); color: #374151; font-size: 0.78rem; }

.credentials-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.credential-card { padding: 28px; border: 1px solid var(--border); border-radius: var(--radius); background: #fff; }
.credential-card h3 { margin-bottom: 7px; }
.credential-card > p:not(.credential-type) { margin: 0; color: var(--muted); }
.credential-details { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; margin-top: 24px; padding-top: 16px; border-top: 1px solid var(--border); color: var(--muted); font-size: 0.88rem; font-weight: 600; }
.certification-list { display: grid; gap: 14px; margin: 15px 0 0; padding: 0; list-style: none; }
.certification-list li { position: relative; padding-left: 26px; color: var(--muted); }
.certification-list li::before { position: absolute; top: 0.37em; left: 0; display: grid; width: 16px; height: 16px; place-items: center; border-radius: 50%; background: var(--accent-soft); color: var(--accent); content: "✓"; font-size: 0.65rem; font-weight: 800; }

.contact-section { border-top: 1px solid var(--border); }
.contact-inner { display: flex; align-items: center; justify-content: space-between; gap: 48px; }
.contact-inner > div:first-child { max-width: 650px; }
.contact-inner h2 { margin-bottom: 14px; }
.contact-inner p:last-child { margin: 0; color: var(--muted); }
.contact-actions { flex: none; justify-content: flex-end; margin-top: 0; }

.site-footer { border-top: 1px solid var(--border); background: var(--surface); color: var(--subtle); }
.footer-inner { display: flex; min-height: 125px; align-items: center; justify-content: space-between; gap: 30px; font-size: 0.88rem; }
.footer-inner p { margin: 0 0 2px; }
.footer-links { display: flex; gap: 22px; }
.footer-links a { font-weight: 600; text-decoration: none; }

@media (max-width: 1040px) {
  .nav-menu { gap: 16px; }
  .nav-menu > a { font-size: 0.85rem; }
  .project-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .contact-inner { align-items: flex-start; flex-direction: column; gap: 26px; }
  .contact-actions { justify-content: flex-start; }
}

@media (max-width: 860px) {
  html { scroll-padding-top: 74px; }
  .container { width: min(calc(100% - 32px), var(--container)); }
  .section { padding: 66px 0; }
  .nav { min-height: 64px; }
  .menu-toggle { display: block; }
  .menu-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
  .nav-menu { position: absolute; top: 64px; right: 0; left: 0; display: none; max-height: calc(100vh - 64px); align-items: stretch; flex-direction: column; gap: 0; overflow-y: auto; padding: 12px 16px 20px; border-bottom: 1px solid var(--border); background: #fff; box-shadow: 0 12px 22px rgba(15, 23, 42, 0.08); }
  .nav-menu.is-open { display: flex; }
  .nav-menu > a { padding: 11px 8px; border-bottom: 1px solid #f1f5f9; font-size: 0.95rem; }
  .nav-socials { margin: 14px 0 0; padding: 0 8px; border-left: 0; }
  .hero { min-height: auto; grid-template-columns: minmax(0, 1fr) 300px; gap: 42px; padding-block: 62px; }
  .hero-actions { gap: 9px; }
  .button-text { padding-inline: 6px; }
  .section-heading-row { align-items: flex-start; flex-direction: column; gap: 12px; }
  .experience-item { grid-template-columns: 150px 1fr; gap: 24px; padding: 24px; }
  .skills-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .skill-group-wide { grid-column: span 2; }
}

@media (max-width: 680px) {
  .section { padding: 56px 0; }
  .section-heading { margin-bottom: 27px; }
  .hero { grid-template-columns: 1fr; gap: 42px; padding-block: 48px 62px; }
  .hero-copy { order: 1; }
  .hero-portrait { order: 2; width: min(82%, 330px); margin-inline: auto; }
  .hero-description { font-size: 1rem; }
  .experience-item { grid-template-columns: 1fr; gap: 14px; padding: 22px; }
  .experience-meta { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 20px; padding-bottom: 13px; border-bottom: 1px solid var(--border); }
  .project-grid, .skills-grid, .credentials-grid { grid-template-columns: 1fr; }
  .skill-group-wide { grid-column: auto; }
  .footer-inner { align-items: flex-start; flex-direction: column; justify-content: center; padding-block: 28px; }
}

@media (max-width: 430px) {
  .container { width: min(calc(100% - 28px), var(--container)); }
  h1 { font-size: 2.45rem; }
  h2 { font-size: 1.9rem; }
  .hero-actions .button-primary, .hero-actions .button-secondary { width: 100%; }
  .hero-actions .button-text { flex: 1; }
  .hero-portrait { width: min(88%, 315px); }
  .hero-portrait::before { inset: 10px -10px -10px 10px; }
  .project-content, .credential-card, .skill-group { padding: 20px; }
  .contact-actions { width: 100%; }
  .contact-actions .button { width: 100%; }
  .footer-links { flex-wrap: wrap; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: 0.01ms !important; }
}