/* ==================================================
   VARIABELEN

   Alles wat per site verandert staat hier bovenaan.
   Kleuren en lettertype aanpassen is meestal genoeg om
   de blueprint een eigen gezicht te geven.

   De clamp()-waarden schalen mee met het scherm: de
   eerste waarde geldt op mobiel, de laatste op desktop.
   Daardoor zijn er nauwelijks media queries nodig.
================================================== */

:root {
  /* kleuren */

  /* lichtblauw: de balken van de header en de footer */
  --primary: #b3d8f1;

  /* diepblauw: knoppen, iconen, randen en links */
  --secondary: #14496c;
  --secondary-hover: color-mix(in srgb, var(--secondary) 85%, var(--white));

  /* tekst en koppen, ook op de lichtblauwe balken */
  --ink: #081d2b;
  --ink-muted: color-mix(in srgb, var(--ink) 72%, transparent);

  --white: #ffffff;
  --white-hover: color-mix(in srgb, var(--white) 90%, transparent);

  /* maten */
  --container-width: 1120px;

  /* global.js meet de echte hoogte; dit is de terugval */
  --header-height: 4.5rem;
  --section-padding: clamp(1rem, calc(0.25rem + 3.75vw), 5rem);

  --space-xs: clamp(0.5rem, 0.45rem + 0.2vw, 0.75rem);
  --space-s: clamp(0.75rem, 0.65rem + 0.4vw, 1rem);
  --space-m: clamp(1rem, 0.85rem + 0.6vw, 1.5rem);
  --space-l: clamp(1.5rem, 1.2rem + 1vw, 2.25rem);
  --space-xl: clamp(2.25rem, 1.7rem + 1.8vw, 3.5rem);
  --space-xxl: clamp(3.5rem, 2.6rem + 3vw, 5.5rem);

  --content-gap-xs: clamp(0.4rem, 0.35rem + 0.15vw, 0.5rem);
  --content-gap-s: clamp(0.6rem, 0.5rem + 0.25vw, 0.75rem);
  --content-gap-m: clamp(0.9rem, 0.75rem + 0.45vw, 1.25rem);
  --content-gap-l: clamp(1.25rem, 1rem + 0.75vw, 1.75rem);
  --content-gap-xl: clamp(1.75rem, 1.35rem + 1.2vw, 2.5rem);

  /* typografie */
  --h1: clamp(2.5rem, 2.1rem + 1.5vw, 3.5rem);
  --h2: clamp(2rem, 1.7rem + 1vw, 2.75rem);
  --h3: clamp(1.5rem, 1.35rem + 0.5vw, 1.875rem);
  --h4: clamp(1.25rem, 1.15rem + 0.3vw, 1.5rem);

  --text: clamp(1rem, 0.95rem + 0.15vw, 1.125rem);
  --text-small: clamp(0.875rem, 0.84rem + 0.1vw, 1rem);

  /* randen en vlakken */
  --radius: 5px;
  --border: 0.3em solid var(--white);
  --border-color-soft: rgb(0 0 0 / 20%);
  --surface: #e9f4fb;

  /* tekst */
  --text-muted: rgb(0 0 0 / 55%);
  --text-placeholder: rgb(0 0 0 / 40%);

  /* schaduw */
  --card-shadow: 0 1rem 2.5rem rgb(0 0 0 / 16%);

  /* lichter, voor grote kaarten naast elkaar */
  --card-shadow-soft: 0 1px 2px rgb(8 29 43 / 6%), 0 12px 32px rgb(8 29 43 / 8%);

  --hairline: 1px solid rgb(8 29 43 / 12%);

  /* meldingen */
  --success-text: #1f6b38;
  --success-surface: #e7f7ec;
  --success-border: #2f9e44;
  --error-text: #a61b1b;
  --error-surface: #fdeaea;
  --error-border: #c92a2a;
}


/* ==================================================
   BASIS
================================================== */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

@media (prefers-reduced-motion: reduce) {

  html {
    scroll-behavior: auto;
  }

}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--secondary);
  outline-offset: 2px;
}

body {
  margin: 0;
  min-height: 100vh;

  color: var(--ink);

  font-family: system-ui, -apple-system, "Segoe UI", roboto, helvetica, arial, sans-serif;
  line-height: 1.5;
}

section {
  display: flex;
  flex-direction: column;
  align-items: center;

  padding-left: var(--section-padding);
  padding-right: var(--section-padding);
  padding-block: var(--space-xxl);
}

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

/*
 * Een eigen display-regel wint van de browserregel voor
 * [hidden]. Zonder deze regel blijft een verborgen <img>
 * dus gewoon staan.
 */
[hidden] {
  display: none !important;
}

button,
input,
textarea,
select {
  font: inherit;
}

a {
  color: inherit;
  text-decoration: none;
  transition: 0.2s;
}

a:hover {
  color: var(--secondary-hover);
}

p {
  margin: 0;
  font-size: var(--text);
}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0;
  line-height: 1.2;
}

h1 {
  font-size: var(--h1);
}

h2 {
  font-size: var(--h2);
}

h3 {
  font-size: var(--h3);
}

h4 {
  font-size: var(--h4);
}

.container {
  width: 100%;
  max-width: var(--container-width);
}


/* ==================================================
   HEADER

   Twee balken: een lichte contactbalk en daaronder de
   donkere balk met logo en menu. Zodra je scrolt klapt
   de contactbalk in; onderweg blijft alleen de donkere
   balk over.
================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
}


/* contactbalk */

.site-header__top {
  display: flex;
  justify-content: center;

  max-height: 8rem;
  padding-inline: var(--section-padding);

  background-color: var(--surface);

  overflow: hidden;

  transition: max-height 0.3s ease-in-out;
}

.site-header.is-scrolled .site-header__top {
  max-height: 0;
}

.site-header__top-inner {
  display: flex;
  justify-content: center;

  padding-block: var(--space-xs);
}

.site-header__contact {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-xs) var(--space-l);

  /* <address> staat standaard cursief */
  font-style: normal;
  font-size: var(--text-small);
}

.site-header__contact-link {
  display: flex;
  align-items: center;
  gap: 0.6em;
}

.site-header__contact-icon {
  flex-shrink: 0;

  width: 1.1em;
  height: 1.1em;

  color: var(--secondary);
}

@media (max-width: 600px) {

  .site-header__top {
    display: none;
  }

}


/* donkere balk */

.site-header__main {
  display: flex;
  justify-content: center;

  padding-inline: var(--section-padding);

  background-color: var(--primary);
}

.header-container {
  position: relative;

  width: 100%;
  max-width: var(--container-width);

  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-m);

  padding-block: var(--space-xs);
}

.site-header__logo {
  color: var(--ink);

  font-size: var(--h4);
  font-weight: 700;
  font-style: italic;
  line-height: 1.2;
}

.site-header__logo:hover {
  color: var(--secondary);
}


/* navigatie */

nav ul {
  list-style: none;

  display: flex;
  flex-direction: row;
  align-items: center;
  gap: var(--space-xs);

  margin: 0;
  padding: 0;

  text-wrap: nowrap;
}

nav ul li a {
  color: var(--ink);
  text-decoration: none;
  transition: color 0.2s ease-in-out;
}

/*
 * De menu-items zijn pillen: bij hover of op de pagina waar je
 * bent kleuren ze lichter op in plaats van dat de tekst verspringt.
 */
.site-nav .nav > li > a:not(.btn),
.nav-item__toggle {
  /* inline-flex, zodat een link en de knop van het
     uitklapmenu even hoog zijn */
  display: inline-flex;
  align-items: center;

  padding: 0.55em 0.85em;

  border-radius: var(--radius);

  transition: background-color 0.2s ease-in-out, color 0.2s ease-in-out;
}

.site-nav .nav > li > a:not(.btn):hover,
.nav-item__toggle:hover {
  color: var(--ink);
  background-color: rgb(255 255 255 / 50%);
}

.site-nav .nav > li > a.is-current,
.nav-item__toggle.is-current {
  background-color: rgb(255 255 255 / 55%);
  font-weight: 600;
}

.site-nav ul li:last-child:hover {
  color: var(--white-hover);
}


/* uitklapmenu */

.nav-item--has-children {
  position: relative;
}

/* de padding en de afronding komen van de pilregel hierboven */
.nav-item__toggle {
  display: flex;
  align-items: center;
  gap: 0.4em;

  color: var(--ink);
  background: none;
  border: none;

  cursor: pointer;
}

.nav-item__toggle:hover {
  color: var(--secondary);
}

.nav-item__chevron {
  width: 1em;
  height: 1em;

  transition: transform 0.2s ease-in-out;
}

.nav-item__toggle[aria-expanded="true"] .nav-item__chevron {
  transform: rotate(180deg);
}

.sub-nav {
  position: absolute;
  top: 100%;
  left: 0;
  z-index: 10;

  display: none;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-s);

  min-width: 100%;
  margin-top: var(--space-xs);
  padding: var(--space-s) var(--space-m);

  background-color: var(--primary);

  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
}

.nav-item--has-children.is-open .sub-nav {
  display: flex;
}


/* ==================================================
   MOBIELE NAVIGATIE
================================================== */

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: stretch;
  gap: 5px;

  width: 2.25rem;
  height: 2.25rem;
  padding: 0;

  background: transparent;
  border: none;

  cursor: pointer;
}

.nav-toggle__bar {
  display: block;
  height: 2px;

  background-color: var(--ink);

  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 768px) {

  .nav-toggle {
    position: relative;
    z-index: 110;

    display: flex;
  }

  .site-nav {
    position: fixed;
    inset: 0;
    z-index: 90;

    display: none;
    align-items: flex-start;
    justify-content: center;

    padding: calc(var(--header-height) + var(--space-xl)) var(--section-padding) var(--space-xl);

    background-color: var(--primary);

    overflow-y: auto;
  }

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

  .site-nav .nav {
    flex-direction: column;
    align-items: center;
    gap: var(--space-m);

    width: 100%;
    max-width: 22rem;
    padding: 0;
  }

  .site-nav .nav > li {
    width: 100%;

    text-align: center;
  }

  .site-nav ul li a {
    display: block;

    padding: var(--space-s) 0;

    font-size: var(--h4);
  }

  .site-nav ul li .btn {
    display: block;

    width: 100%;
    padding: var(--space-s) 0;
    margin-top: 0;

    color: var(--ink);
    background-color: transparent;

    border-radius: 0;
  }

  .site-nav ul li .btn:hover {
    background-color: transparent;
  }

  /* het uitklapmenu schuift open ín de lijst */

  .nav-item__toggle {
    justify-content: center;

    width: 100%;
    padding: var(--space-s) 0;

    font-size: var(--h4);
  }

  .sub-nav {
    position: static;

    align-items: center;

    gap: 0;

    margin-top: 0;
    padding: 0;

    background-color: transparent;

    border: none;
    box-shadow: none;
  }

  .site-nav .sub-nav li a {
    font-size: var(--text);
    color: var(--ink-muted);
  }

}

body.nav-open {
  overflow: hidden;
}


/* ==================================================
   KNOPPEN
================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: fit-content;

  padding: 0.5rem 1rem;

  background-color: var(--secondary);
  color: var(--white);

  border-radius: var(--radius);
  text-decoration: none;
}

.btn:hover {
  background-color: var(--secondary-hover);
  color: var(--white-hover);

  transition: background-color 0.2s ease-in-out;
}

/* tweede keus naast een gevulde knop */
.btn--secondary {
  color: var(--secondary);
  background-color: var(--surface);

  border: 1px solid var(--secondary);
}

.btn--secondary:hover {
  color: var(--secondary);
  background-color: var(--primary);
}


/* ==================================================
   FORMULIER

   Werkt voor elk formulier: twee kolommen op desktop,
   één op mobiel. Een veld dat de volle breedte moet
   hebben krijgt .form__field--full.
================================================== */

.form {
  --field-padding: 0.7rem 1rem;

  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-m);

  width: 100%;

  /* een formulier over de volle containerbreedte leest niet prettig */
  max-width: min(var(--container-width), 45rem);
  margin-top: var(--space-l);
}

.form__field {
  min-width: 0;
}

/* zichtbaar label boven het veld */
.form__field label {
  display: block;

  margin-bottom: 0.4em;

  font-size: var(--text-small);
  font-weight: 600;
}

.form__optional {
  color: var(--ink-muted);
  font-weight: 400;
}

.form__field--full,
.form__privacy,
.form__submit,
.form__success,
.form__error--form {
  grid-column: 1 / -1;
}

.form input:not([type="checkbox"]),
.form select,
.form textarea {
  width: 100%;
  padding: var(--field-padding);

  font: inherit;
  color: var(--ink);

  background-color: var(--white);

  border: 1px solid var(--border-color-soft);
  border-radius: var(--radius);

  transition: border-color 0.2s ease, outline-color 0.2s ease;
}

.form input::placeholder,
.form textarea::placeholder {
  color: var(--text-placeholder);
}

.form textarea {
  min-height: 12rem;
  resize: vertical;
}

.form input:not([type="checkbox"]):focus,
.form select:focus,
.form textarea:focus {
  border-color: var(--secondary);

  outline: 2px solid var(--secondary);
  outline-offset: 2px;
}

.form__privacy {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.form__privacy input {
  flex: 0 0 auto;

  width: 1.25rem;
  height: 1.25rem;

  accent-color: var(--secondary);

  cursor: pointer;
}

.form__privacy label {
  font-size: var(--text-small);
}

.form__privacy a {
  color: var(--secondary);
  font-weight: 600;
}

.form__submit {
  width: 100%;

  border: none;

  cursor: pointer;
}

@media (max-width: 600px) {

  .form {
    grid-template-columns: 1fr;
  }

}


/* meldingen */

.form__success {
  padding: var(--space-m);

  color: var(--success-text);
  background-color: var(--success-surface);

  border-left: 4px solid var(--success-border);
  border-radius: var(--radius);

  font-size: var(--text);
  font-weight: 500;
}

.form__error {
  margin-top: var(--space-xs);

  color: var(--error-text);

  font-size: var(--text-small);
  font-weight: 500;
}

.form__error--form {
  padding: var(--space-m);
  margin-top: 0;

  color: var(--error-text);
  background-color: var(--error-surface);

  border-left: 4px solid var(--error-border);
  border-radius: var(--radius);
}


/* honeypot: onzichtbaar voor mensen, zichtbaar voor bots */

.form__honeypot {
  position: absolute;
  left: -9999px;

  width: 1px;
  height: 1px;

  overflow: hidden;
}


/* label dat alleen een schermlezer voorleest */

.visually-hidden {
  position: absolute;

  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;

  overflow: hidden;

  clip: rect(0 0 0 0);
  clip-path: inset(50%);

  white-space: nowrap;

  border: 0;
}


/* ==================================================
   404
================================================== */

.error-page {
  min-height: 70vh;
  justify-content: center;
}

.error-page__container {
  display: flex;
  flex-direction: column;
  align-items: center;

  gap: var(--content-gap-m);

  max-width: 40rem;

  text-align: center;
}

.error-page__code {
  color: var(--secondary);

  font-size: var(--h1);
  font-weight: 700;
  line-height: 1;
}

.error-page__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;

  gap: var(--space-m);

  padding-top: var(--space-s);
}

.error-page__link {
  color: var(--secondary);

  font-size: var(--text-small);
  font-weight: 600;
}


/* ==================================================
   FOOTER

   Boven het logo met de navigatie ernaast, daaronder
   een smalle regel met copyright en privacybeleid.
================================================== */

footer {
  display: flex;
  flex-direction: column;
}

.site-footer {
  background-color: var(--primary);
}

.site-footer__top,
.site-footer__legal {
  display: flex;
  justify-content: center;

  padding-inline: var(--section-padding);
}

.site-footer__top-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-m) var(--space-xl);

  padding-block: var(--space-xl);
}

.site-footer__logo {
  color: var(--ink);

  font-size: var(--h4);
  font-weight: 700;
  font-style: italic;
  line-height: 1.2;
}

.site-footer__logo:hover {
  color: var(--secondary);
}

.site-footer__nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-xs) var(--space-m);

  margin: 0;
  padding: 0;

  list-style: none;
}

.site-footer__nav a {
  color: var(--ink);
  text-decoration: none;
}

.site-footer__nav a:hover {
  color: var(--ink);
  text-decoration: underline;
}


/* onderste regel */

.site-footer__legal {
  border-top: 1px solid rgb(0 0 0 / 15%);
}

.site-footer__legal-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-xs) var(--space-m);

  padding-block: var(--space-s);
}

.site-footer__copyright,
.site-footer__legal-nav a {
  color: var(--ink-muted);
  font-size: var(--text-small);
}

.site-footer__copyright a {
  color: var(--secondary);
}

footer a:hover {
  color: var(--secondary-hover);
}

@media (max-width: 600px) {

  .site-footer__top-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-m);
  }

}