/*
  Code-principe: deze stylesheet moet altijd leesbaar blijven voor mensen.
  Geen minificatie, geen samengevoegde eenregelige selectors — nette
  meerregelige blokken met inspringing, ook bij toekomstige aanpassingen.
*/

:root {
  --color-red: #f25022;
  --color-green: #7fba00;
  --color-blue: #00a4ef;
  --color-yellow: #ffb900;
  --color-purple: #7b2c8e;
  --text: #222222;
  --text-muted: #5b5b5b;
  --line: #c9c9c9;
  --soft-line: #e6e6e6;
  --pale-blue: #eef8fd;
  --focus: #0067b8;
  --font-body: Tahoma, Verdana, sans-serif;
  --font-heading:Tahoma, Verdana, sans-serif;
  --nav-offset: 5rem;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-offset);
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: #fff;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
}

a {
  color: var(--focus);
  text-decoration-thickness: 1px;
  text-underline-offset: .18em;
}

a:hover {
  color: #004f91;
}

a[target="_blank"]::after {
  content: " ↗";
  display: inline-block;
  font-size: .9em;
  opacity: .75;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--color-yellow);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -5rem;
  background: var(--focus);
  color: #fff;
  padding: .7rem 1rem;
  font-weight: 700;
  z-index: 10;
}

.skip-link:focus {
  top: 1rem;
}

/* Header en navigatie */

.site-header {
  position: sticky;
  top: 0;
  z-index: 9;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
  min-height: 72px;
  padding: .8rem clamp(1.25rem, 5vw, 5rem);
  background: #fff;
  border-bottom: 1px solid var(--line);
  box-shadow: 0 2px 6px rgba(0, 0, 0, .08);
}

.brand {
  display: flex;
  align-items: center;
  gap: .8rem;
  color: var(--text);
  font-size: 1.12rem;
  font-weight: 700;
  text-decoration: none;
}

.brand-mark {
  display: block;
  width: 36px;
  height: 36px;
}

.menu-toggle {
  display: none;
  border: 1px solid #777;
  background: #fff;
  color: var(--text);
  font-family: var(--font-body);
  font-weight: 700;
  padding: .55rem .75rem;
  cursor: pointer;
}

.topnav {
  display: flex;
  gap: 0;
  flex-wrap: wrap;
}

.topnav a {
  color: #333;
  text-decoration: none;
  font-size: .94rem;
  font-weight: 600;
  padding: .7rem .8rem;
  border: 0;
  border-bottom: 3px solid transparent;
}

.topnav a.active,
.topnav a:hover {
  color: var(--focus);
  background: #f4f9fb;
  border-color: var(--color-blue);
}

.topnav a:nth-child(4n+2).active,
.topnav a:nth-child(4n+2):hover {
  color: #5d8a00;
  background: #f4f9ee;
  border-color: var(--color-green);
}

.topnav a:nth-child(4n+3).active,
.topnav a:nth-child(4n+3):hover {
  color: #b63514;
  background: #fdf1ee;
  border-color: var(--color-red);
}

.topnav a:nth-child(4n).active,
.topnav a:nth-child(4n):hover {
  color: #8a6400;
  background: #fdf8e8;
  border-color: var(--color-yellow);
}

/* Layout */

main {
  flex: 1;
  padding: clamp(2.5rem, 6vw, 6rem) clamp(1.25rem, 5vw, 5rem);
}

.page {
  display: none;
  max-width: 1240px;
  margin: 0 auto;
}

.page.active {
  display: block;
  animation: page-in .28s ease-out;
}

@keyframes page-in {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Typografie */

h1,
h2,
h3 {
  font-family: var(--font-heading);
  color: var(--text);
  font-weight: 600;
  letter-spacing: 0;
  margin: 0 0 .8rem;
}

h1 {
  font-size: clamp(2.25rem, 5vw, 4.35rem);
  line-height: 1.1;
  margin: 0 0 1.4rem;
}

h2 {
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  line-height: 1.25;
}

h3 {
  font-size: 1.15rem;
  line-height: 1.3;
  margin-bottom: .35rem;
}

.kicker {
  text-transform: uppercase;
  color: var(--focus);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .08em;
  margin: 0 0 .8rem;
}

.lead {
  color: #404040;
  font-size: clamp(1.08rem, 1.8vw, 1.3rem);
  line-height: 1.65;
  max-width: 780px;
}

.narrow {
  max-width: 800px;
}

.readable {
  max-width: 880px;
}

/* Hero */

.hero-overlay {
  position: relative;
  display: flex;
  align-items: center;
  min-height: min(48vh, 460px);
  padding: clamp(2rem, 4vw, 3rem);
  overflow: hidden;
  background-color: #f7fcff;
  background-image:
    linear-gradient(90deg, rgba(255, 255, 255, .97) 0%, rgba(255, 255, 255, .87) 52%, rgba(255, 255, 255, .35) 100%),
    url("../images/hero-illustratie.webp");
  background-position: center;
  background-size: cover;
  border: 1px solid var(--line);
}

.hero-overlay::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 6px;
  background: linear-gradient(90deg, var(--color-red) 0 25%, var(--color-green) 25% 50%, var(--color-blue) 50% 75%, var(--color-yellow) 75%);
}

.hero-copy {
  position: relative;
  width: 100%;
  text-align: left;
}

.hero-copy h1 {
  font-size: clamp(2.5rem, 4.5vw, 4.2rem);
}

.hero-copy .lead {
  max-width: none;
}

/* Knoppen */

.actions {
  display: flex;
  gap: .75rem;
  flex-wrap: wrap;
  margin-top: 1.5rem;
  justify-content: flex-start;
}

.button {
  min-height: 44px;
  padding: .7rem 1.1rem;
  border: 1px solid var(--focus);
  font-family: var(--font-body);
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #fff;
  color: var(--text);
  transition: background-color .18s ease, color .18s ease, border-color .18s ease;
}

.primary {
  background: var(--focus);
  border-color: var(--focus);
  color: #fff;
}

.secondary {
  color: var(--focus);
  border-color: var(--focus);
}

.button:hover,
.button:focus,
.menu-toggle:hover,
.menu-toggle:focus {
  border-color: var(--focus);
}

.button.primary:hover,
.button.primary:focus {
  background: #004f91;
  border-color: #004f91;
  color: #fff;
}

.button.secondary:hover,
.button.secondary:focus {
  background: var(--pale-blue);
  border-color: #004f91;
  color: #004f91;
}

/* Kaarten en panelen */

.result-panel,
.topic-card,
.assignment-card,
.blog-card,
.project-card,
.compact-item,
.contact-card {
  padding: clamp(1.35rem, 2.5vw, 2rem);
  background: #fff;
  border: 1px solid var(--line);
}

.intro-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem;
  margin-top: 3rem;
}

.topic-card {
  border-top: 5px solid var(--color-blue);
}

.topic-card:nth-child(2) {
  border-top-color: var(--color-green);
}

.topic-card:nth-child(3) {
  border-top-color: var(--color-yellow);
}

.topic-card:hover {
  border-top-color: #8f8f8f;
}

.topic-card p:last-child,
.compact-item:last-child {
  margin-bottom: 0;
}

.split-block {
  display: grid;
  grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
  gap: clamp(2rem, 5vw, 5rem);
  margin-top: 5rem;
  padding-top: 4rem;
  border-top: 1px solid var(--line);
  align-items: start;
}

.compact-list {
  display: grid;
  gap: 1.25rem;
}

.split-block-link {
  margin-top: 1rem;
}

.compact-item {
  padding: 1.15rem 1.35rem;
  border-left: 4px solid var(--color-blue);
}

.compact-item:nth-child(2) {
  border-left-color: var(--color-green);
}

.compact-item:nth-child(3) {
  border-left-color: var(--color-red);
}

.compact-item:hover {
  border-left-color: #8f8f8f;
}

.compact-item a {
  color: var(--focus);
  font-weight: 700;
  text-decoration: none;
}

.compact-item time,
.blog-meta,
.assignment-meta,
.project-meta {
  color: var(--text-muted);
  font-weight: 500;
  margin: 0 0 .6rem;
}

.blog-list,
.project-list,
.assignment-list {
  display: grid;
  gap: 1.25rem;
  margin-top: 3rem;
}

.blog-card {
  display: grid;
  grid-template-columns: 190px minmax(0, 1fr);
  gap: 2rem;
  align-items: start;
}

.project-card {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  gap: 2rem;
}

.blog-card:hover,
.project-card:hover {
  border-color: #8f8f8f;
}

.blog-thumb,
.project-thumb {
  border: 1px solid var(--line);
  background-color: var(--pale-blue);
  background-image: linear-gradient(90deg, rgba(0, 164, 239, .08), rgba(255, 185, 0, .08)), url("../images/hero-illustratie.webp");
  background-size: cover;
  background-position: center;
  height: 160px;
}

.blog-card h2,
.project-card h2 {
  margin-top: 0;
}

.blog-card h2 a {
  color: var(--text);
  text-decoration-color: var(--color-blue);
}

.article-detail {
  max-width: 980px;
}

.article-detail h1 {
  max-width: 900px;
  font-size: clamp(2rem, 4vw, 3.35rem);
  line-height: 1.12;
}

.article-hero {
  margin: 2rem 0 2.5rem;
  border: 1px solid var(--line);
  background: var(--pale-blue);
}

.article-hero img {
  display: block;
  width: 100%;
  max-height: 340px;
  object-fit: cover;
}

.article-detail p {
  max-width: 760px;
  font-size: 1.06rem;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: .55rem;
  margin-top: .7rem;
}

.tag,
.summary-pill {
  display: inline-flex;
  padding: .35rem .65rem;
  background: #f4f9fb;
  border: 1px solid #9bc9e3;
  color: #135f8d;
  font-size: .9rem;
  font-weight: 600;
}

.assignment-card {
  border-left: 5px solid var(--color-blue);
}

.assignment-card:nth-child(4n+2) {
  border-left-color: var(--color-green);
}

.assignment-card:nth-child(4n+3) {
  border-left-color: var(--color-red);
}

.assignment-card:nth-child(4n) {
  border-left-color: var(--color-yellow);
}

.assignment-card:nth-child(4n+2) .kicker,
.assignment-card:nth-child(4n+2) summary {
  color: #5d8a00;
}

.assignment-card:nth-child(4n+3) .kicker,
.assignment-card:nth-child(4n+3) summary {
  color: #b63514;
}

.assignment-card:nth-child(4n) .kicker,
.assignment-card:nth-child(4n) summary {
  color: #8a6400;
}

.assignment-card:hover {
  border-left-color: #8f8f8f;
}

.assignment-card details {
  margin-top: .75rem;
  border-top: 1px solid var(--soft-line);
  padding-top: 1rem;
}

.assignment-card summary {
  cursor: pointer;
  color: var(--focus);
  font-weight: 700;
}

.clean-list {
  padding-left: 1.1rem;
}

.clean-list li {
  margin: .6rem 0;
}

.summary-strip {
  display: flex;
  flex-wrap: wrap;
  gap: .65rem;
  margin: 2rem 0;
}

.skills-layout,
.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5rem;
  margin-top: 2.5rem;
}

.result-panel {
  margin-top: 2.5rem;
}

.result-panel h2 {
  padding-bottom: .75rem;
  border-bottom: 3px solid var(--color-blue);
}

.skills-layout .result-panel {
  margin-top: 0;
}

.skills-layout .result-panel:nth-child(2) h2 {
  border-bottom-color: var(--color-green);
}

/* Contactkaarten */

.contact-card {
  position: relative;
  overflow: hidden;
  border-top: 5px solid var(--color-green);
  transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
}

.contact-card h2 {
  color: #5d8a00;
  border-bottom: 0;
  padding-bottom: 0;
}

.contact-card a {
  color: #5d8a00;
  font-weight: 700;
}

.contact-card .icon-svg {
  color: #5d8a00;
  margin-right: .35rem;
}

.icon-svg {
  display: inline-block;
  width: 1.25em;
  height: 1.25em;
  vertical-align: -.25em;
  color: currentColor;
  background-color: currentColor;
  background-position: center;
  background-repeat: no-repeat;
  background-size: contain;
  mask-position: center;
  mask-repeat: no-repeat;
  mask-size: contain;
  -webkit-mask-position: center;
  -webkit-mask-repeat: no-repeat;
  -webkit-mask-size: contain;
}

.icon-file-pdf {
  mask-image: url("/images/icon-file-pdf.svg");
  -webkit-mask-image: url("/images/icon-file-pdf.svg");
}

.icon-linkedin {
  mask-image: url("/images/icon-linkedin.svg");
  -webkit-mask-image: url("/images/icon-linkedin.svg");
}

.icon-globe {
  mask-image: url("/images/icon-globe.svg");
  -webkit-mask-image: url("/images/icon-globe.svg");
}

.icon-phone {
  mask-image: url("/images/icon-phone.svg");
  -webkit-mask-image: url("/images/icon-phone.svg");
}

.icon-envelope {
  mask-image: url("/images/icon-envelope.svg");
  -webkit-mask-image: url("/images/icon-envelope.svg");
}

.contact-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, .1);
  border-color: #8f8f8f;
}

.contact-card::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-red) 0 25%, var(--color-green) 25% 50%, var(--color-blue) 50% 75%, var(--color-yellow) 75%);
}

.contact-card-cavero {
  border-top-color: var(--color-purple);
}

.contact-card-cavero a,
.contact-card-cavero .icon-svg {
  color: var(--color-purple);
}

.article-detail img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 1.5rem 0;
}

.article-detail pre {
  overflow-x: auto;
  margin: 1.5rem 0;
  padding: 1rem;
  background: #1f2933;
  color: #f5f7fa;
  border-left: 4px solid var(--color-blue);
  line-height: 1.5;
}

.article-detail pre code {
  color: inherit;
}

.article-detail blockquote {
  margin: 1.5rem 0;
  padding: .75rem 1rem;
  border-left: 4px solid var(--color-yellow);
  background: #fdf8e8;
}

.article-detail ul,
.article-detail ol {
  padding-left: 1.5rem;
}

.cavero-logo {
  display: block;
  height: 34px;
  width: auto;
  margin-bottom: 1rem;
}

/* Footer */

.site-footer {
  margin-top: 6rem;
  background: #f5f5f5;
  border-top: 5px solid var(--color-blue);
}

.footer-content {
  max-width: 1240px;
  margin: 0 auto;
  padding: 1.5rem clamp(1.25rem, 5vw, 5rem);
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: .75rem;
  color: var(--text-muted);
  font-size: .9rem;
}

.footer-content a {
  color: var(--focus);
  text-decoration: none;
}

.footer-content a:hover {
  text-decoration: underline;
}

.footer-separator {
  color: #8a8f95;
}

/* Responsive */

@media (max-width: 900px) {
  .site-header {
    gap: 1rem;
    flex-wrap: wrap;
  }

  .menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .topnav {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    margin-top: .25rem;
  }

  .topnav.open {
    display: flex;
  }

  .topnav a {
    display: block;
    padding: .75rem .85rem;
    border-left: 3px solid transparent;
    border-bottom: 0;
  }

  .topnav a.active,
  .topnav a:hover {
    border-left-color: var(--color-blue);
  }

  .topnav a:nth-child(4n+2).active,
  .topnav a:nth-child(4n+2):hover {
    border-left-color: var(--color-green);
  }

  .topnav a:nth-child(4n+3).active,
  .topnav a:nth-child(4n+3):hover {
    border-left-color: var(--color-red);
  }

  .topnav a:nth-child(4n).active,
  .topnav a:nth-child(4n):hover {
    border-left-color: var(--color-yellow);
  }

  .intro-grid,
  .split-block,
  .skills-layout,
  .contact-grid,
  .project-card {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }

  .blog-card {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  :root {
    --nav-offset: 7.5rem;
  }

  main {
    padding: 2rem 1.1rem 3.5rem;
  }

  .hero-overlay {
    min-height: 25rem;
    padding: 2.25rem 1.5rem;
    background-image:
      linear-gradient(90deg, rgba(255, 255, 255, .96), rgba(255, 255, 255, .76)),
      url("../images/hero-illustratie.webp");
  }

  .hero-copy h1,
  .hero-copy .kicker {
    overflow-wrap: anywhere;
  }

  .hero-copy h1 {
    font-size: clamp(2.4rem, 12vw, 3.5rem);
  }

  .intro-grid,
  .split-block {
    margin-top: 2.5rem;
  }

  .split-block {
    padding-top: 2.5rem;
  }

  .actions {
    width: 100%;
  }

  .actions .button {
    width: auto;
  }

  .blog-card,
  .project-card {
    gap: 1.2rem;
  }

  .blog-thumb,
  .project-thumb {
    height: 140px;
  }

  .footer-content {
    justify-content: flex-start;
    padding: 1rem;
  }
}