/* ============ Custom properties ============ */
:root {
  --bg: #0b1120;
  --bg-alt: #0f172a;
  --surface: #111c33;
  --surface-border: #223252;
  --text: #e7ecf6;
  --text-muted: #9aa7c2;
  --accent: #2dd4bf;
  --accent-strong: #14b8a6;
  --accent-contrast: #04140f;
  --danger: #f87171;
  --radius: 14px;
  --radius-sm: 8px;
  --max-width: 1160px;
  --font-body: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --shadow-lg: 0 20px 60px -20px rgba(0,0,0,0.55);
  --transition: 200ms ease;
}

/* ============ Reset ============ */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; margin: 0; padding: 0; }
h1, h2, h3 { margin: 0 0 0.5em; line-height: 1.2; font-weight: 800; }
p { margin: 0 0 1em; color: var(--text-muted); }
button { font: inherit; cursor: pointer; }

.skip-link {
  position: absolute;
  left: -999px;
  top: auto;
  background: var(--accent);
  color: var(--accent-contrast);
  padding: 0.75em 1.25em;
  border-radius: var(--radius-sm);
  z-index: 1000;
}
.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

/* Alleen zichtbaar voor screenreaders. */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.container {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: 1.5rem;
}

.section { padding: 6rem 0; }
.section-alt { background: var(--bg-alt); }

.section-head { max-width: 640px; margin-bottom: 3rem; }
.section-intro { font-size: 1.05rem; }

.eyebrow {
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 0 0 0.75rem;
  font-weight: 500;
}

h2 { font-size: clamp(1.6rem, 3vw, 2.25rem); }

/* ============ Buttons ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  padding: 0.85em 1.6em;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: transform var(--transition), background var(--transition), border-color var(--transition), color var(--transition);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary {
  background: var(--accent);
  color: var(--accent-contrast);
}
.btn-primary:hover { background: var(--accent-strong); }
.btn-outline {
  border-color: var(--surface-border);
  color: var(--text);
  background: transparent;
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }
.btn-small { padding: 0.6em 1.2em; font-size: 0.875rem; }
.full-width { width: 100%; }

/* ============ Header ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--surface-border);
}
/* Blur lives on a pseudo-element (not .site-header itself) so the header
   doesn't create a new containing block for its fixed-position mobile nav. */
.site-header::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  background: rgba(11, 17, 32, 0.85);
  backdrop-filter: blur(10px);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  height: 72px;
}
/* Padding houdt het klikvlak >= 44x44 (ook bij het 36px-icoon op mobiel);
   de negatieve marge links houdt het logo visueel uitgelijnd met de content. */
.logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  padding: 4px 7px;
  margin-left: -7px;
  border-radius: var(--radius-sm);
}
.logo img { height: 48px; width: auto; }
.logo:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.nav-list {
  display: flex;
  gap: 2rem;
}
.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition);
  position: relative;
}
.nav-link:hover { color: var(--text); }

.header-cta { margin-left: auto; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-sm);
}
.nav-toggle span {
  display: block;
  height: 2px;
  margin-inline: 9px;
  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); }

/* ============ Hero ============ */
/* Eén kolom, links uitgelijnd: de content start op dezelfde x-positie als de
   overige secties (.container). */
.hero { padding: 7rem 0 5rem; }
.hero-content { max-width: 760px; min-width: 0; }
.hero-content h1 {
  font-size: clamp(2.2rem, 5.5vw, 4rem);
  letter-spacing: -0.02em;
}
.hero-role {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 1.1rem;
  margin-bottom: 1.25rem;
}
.hero-text { font-size: 1.15rem; max-width: 60ch; }
.hero-actions { display: flex; gap: 1rem; margin-top: 2rem; flex-wrap: wrap; }

/* ============ About ============ */
.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 3rem;
  align-items: start;
}
.about-highlights {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-top: 1.5rem;
}
.about-highlights li {
  padding-left: 1.5rem;
  position: relative;
  color: var(--text);
}
.about-highlights li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
}
.about-highlights strong { color: var(--accent); }

.about-card {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius);
  padding: 2rem;
}
.about-card h3 { font-size: 1.1rem; margin-bottom: 1.25rem; }
.fact-list { margin: 0 0 1.5rem; display: flex; flex-direction: column; gap: 1rem; }
.fact-list div { display: flex; flex-direction: column; gap: 0.15rem; }
.fact-list dt {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}
.fact-list dd { margin: 0; font-weight: 600; }

/* ============ Skills ============ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem;
}
.skill-card {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: border-color var(--transition), transform var(--transition);
}
.skill-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}
.skill-icon {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-sm);
  background: rgba(45, 212, 191, 0.12);
  color: var(--accent);
  margin-bottom: 1.1rem;
}
.skill-icon svg { width: 22px; height: 22px; }
.skill-card h3 { font-size: 1.05rem; margin-bottom: 0.9rem; }
.tag-list { display: flex; flex-direction: column; gap: 0.5rem; }
.tag-list li {
  font-size: 0.9rem;
  color: var(--text-muted);
  padding-left: 1.1rem;
  position: relative;
}
.tag-list li::before {
  content: '›';
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* ============ Projects ============ */
/* Flexbox i.p.v. grid: volle rijen lopen rand tot rand, een onvolledige laatste rij
   wordt gecentreerd. Kaarten hebben een vaste basis (geen flex-grow), zodat een losse
   kaart even breed blijft als de rest. Volgorde komt uitsluitend uit de DOM. */
.projects-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: center;
}
.project-card {
  flex: 0 0 calc((100% - 3rem) / 3);
  min-width: 0;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  transition: border-color var(--transition), transform var(--transition);
}
.project-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}
.project-tag {
  display: inline-block;
  align-self: flex-start;
  max-width: 100%;
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--accent);
  background: rgba(45, 212, 191, 0.12);
  padding: 0.3em 0.75em;
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
}
.project-card h3 { font-size: 1.15rem; margin-bottom: 0.6rem; }
.project-card p { font-size: 0.95rem; flex-grow: 1; }
.tag-list-pills {
  flex-direction: row;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}
.tag-list-pills li {
  padding: 0.3em 0.75em;
  background: var(--bg-alt);
  border: 1px solid var(--surface-border);
  border-radius: 999px;
  font-size: 0.78rem;
  color: var(--text-muted);
}
.tag-list-pills li::before { content: none; }

/* ============ Contact ============ */
.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 3rem;
  align-items: start;
}
.contact-info { display: flex; flex-direction: column; gap: 1rem; }
.contact-link {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 1rem 1.25rem;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: border-color var(--transition), color var(--transition);
}
.contact-link:hover { border-color: var(--accent); color: var(--accent); }
.contact-icon {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  color: var(--accent);
}
/* Decoratief pijltje voor externe links, rechts uitgelijnd in de knop. */
.contact-external {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  margin-left: auto;
  color: var(--text-muted);
  transition: color var(--transition);
}
.contact-link:hover .contact-external { color: var(--accent); }

.contact-form {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius);
  padding: 2rem;
}
.form-row { margin-bottom: 1.25rem; display: flex; flex-direction: column; gap: 0.5rem; }
.form-row label { font-size: 0.85rem; font-weight: 600; color: var(--text-muted); }
.form-row input, .form-row textarea {
  background: var(--bg-alt);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-sm);
  padding: 0.75em 1em;
  color: var(--text);
  font: inherit;
  resize: vertical;
  transition: border-color var(--transition);
}
.form-row input:focus, .form-row textarea:focus {
  outline: none;
  border-color: var(--accent);
}
.form-row input.is-invalid,
.form-row textarea.is-invalid {
  border-color: var(--danger);
}
.form-status {
  min-height: 1.4em;
  font-size: 0.85rem;
  color: var(--accent);
  margin: 0 0 1rem;
}
.form-status.is-error { color: var(--danger); }
.form-hint { font-size: 0.8rem; margin: 0.9rem 0 0; text-align: center; }

/* ============ Footer ============ */
.site-footer {
  border-top: 1px solid var(--surface-border);
  padding: 3rem 0;
  background: var(--bg-alt);
}
.footer-inner {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}
.footer-logo { height: 44px; width: auto; margin-bottom: 1rem; }
.footer-name { font-weight: 700; color: var(--text); margin-bottom: 0.25rem; }
.footer-role { font-size: 0.85rem; }
.footer-legal p { font-size: 0.8rem; margin: 0 0 0.3rem; font-family: var(--font-mono); }
.footer-copy { text-align: right; align-self: end; }
.footer-copy p { font-size: 0.8rem; margin: 0; }
/* Link naar de testdata-generator: onderstreept zodat hij als link herkenbaar is. */
.footer-copy .footer-tool { margin-bottom: 0.6rem; }
.footer-tool a {
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--transition);
}
.footer-tool a:hover { color: var(--accent); }

/* ============ Back to top ============ */
.to-top {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-contrast);
  border: none;
  display: grid;
  place-items: center;
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: opacity var(--transition), transform var(--transition);
  box-shadow: var(--shadow-lg);
  z-index: 90;
}
.to-top.is-visible { opacity: 1; pointer-events: auto; transform: translateY(0); }
.to-top svg { width: 20px; height: 20px; }

/* ============ Scroll reveal ============ */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 600ms ease, transform 600ms ease;
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* ============ Responsive ============ */
@media (max-width: 900px) {
  .about-grid { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .contact-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-inner { grid-template-columns: 1fr; text-align: left; }
  .footer-copy { text-align: left; }
}

@media (min-width: 721px) and (max-width: 900px) {
  .logo img { height: 44px; }
  .nav-list { gap: 1.25rem; }
  .project-card { flex: 0 0 calc((100% - 1.5rem) / 2); }
}

@media (max-width: 720px) {
  .header-cta { display: none; }
  .nav-toggle { display: flex; }
  .nav {
    position: fixed;
    inset: 72px 0 0 0;
    background: var(--bg);
    transform: translateX(100%);
    transition: transform var(--transition);
    padding: 2rem 1.5rem;
    border-top: 1px solid var(--surface-border);
  }
  .nav.is-open { transform: translateX(0); }
  .nav-list { flex-direction: column; gap: 1.5rem; }
  .nav-link { font-size: 1.1rem; }
  .section { padding: 4rem 0; }
  .hero { padding: 4rem 0; }
  .skills-grid { grid-template-columns: minmax(0, 1fr); }
  .project-card { flex: 0 0 100%; }
}

@media (max-width: 480px) {
  .logo img { height: 36px; } /* <picture> toont hier het icoon */
  .hero-actions { flex-direction: column; align-items: stretch; }
}

/* ============ Reduced motion ============ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .btn:hover, .skill-card:hover, .project-card:hover { transform: none; }
}