/* ===========================================================
   tekstverbanden.nl — gedeelde stijl
   Thema: "lezen als architectuur" — serieus, warm, helder
   =========================================================== */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,500;9..144,600;9..144,700&family=Source+Sans+3:wght@400;500;600;700&family=Source+Code+Pro:wght@500;600&display=swap');

:root {
  --ink: #1a2b4a;          /* diep inktblauw - tekst & koppen */
  --ink-soft: #41506b;     /* zachter blauw - bijschriften */
  --paper: #fbf9f4;        /* warm papier - achtergrond */
  --paper-2: #f3eee3;      /* iets dieper papier - kaarten */
  --teal: #2d7a6b;         /* serieus groen - accent / merk */
  --teal-dark: #1f5b4f;
  --teal-soft: #e4efe9;
  --coral: #e07856;        /* coral - markeren / fout */
  --coral-soft: #fcecE5;
  --gold: #c9a227;         /* goud - juist / inzicht */
  --gold-soft: #f7efd4;
  --line: #e3ddd0;         /* hairline */
  --shadow: 0 1px 2px rgba(26,43,74,.04), 0 8px 24px rgba(26,43,74,.06);
  --shadow-lg: 0 2px 4px rgba(26,43,74,.06), 0 18px 48px rgba(26,43,74,.10);
  --radius: 14px;
  --radius-sm: 8px;
  --maxw: 1080px;
  --serif: 'Fraunces', Georgia, 'Times New Roman', serif;
  --sans: 'Source Sans 3', system-ui, -apple-system, sans-serif;
  --mono: 'Source Code Pro', ui-monospace, monospace;
}

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

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation: none !important; transition: none !important; }
}

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ---------- skip link ---------- */
.skip {
  position: absolute; left: -999px; top: 0;
  background: var(--ink); color: #fff; padding: .6rem 1rem;
  border-radius: 0 0 var(--radius-sm) 0; z-index: 999;
}
.skip:focus { left: 0; }

/* ---------- layout ---------- */
.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 1.5rem; }
.narrow { max-width: 760px; }

/* ---------- header / nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(251,249,244,.88);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; min-height: 68px;
}
.brand { display: flex; align-items: center; gap: .65rem; text-decoration: none; color: var(--ink); }
.brand .logo { flex: 0 0 auto; }
.brand b { font-family: var(--serif); font-weight: 600; font-size: 1.2rem; letter-spacing: -.01em; }
.brand span { display: block; font-size: .72rem; color: var(--ink-soft); letter-spacing: .04em; text-transform: uppercase; font-weight: 600; }

.nav-toggle {
  display: none; background: none; border: 1px solid var(--line);
  border-radius: var(--radius-sm); padding: .45rem .55rem; cursor: pointer; color: var(--ink);
}
.nav-links { display: flex; align-items: center; gap: .25rem; list-style: none; margin: 0; padding: 0; }
.nav-links a {
  display: inline-block; text-decoration: none; color: var(--ink-soft);
  font-weight: 600; font-size: .95rem; padding: .5rem .7rem; border-radius: var(--radius-sm);
  transition: background .15s, color .15s;
}
.nav-links a:hover, .nav-links a:focus-visible { color: var(--ink); background: var(--paper-2); }
.nav-links a[aria-current="page"] { color: var(--teal-dark); background: var(--teal-soft); }
.nav-links .btn-nav {
  border: 1.5px solid var(--teal); color: var(--teal-dark); padding: .5rem .9rem;
}
.nav-links .btn-nav:hover, .nav-links .btn-nav:focus-visible { background: var(--teal); color: #fff; }
.nav-links .btn-nav[aria-current="page"] { background: var(--teal); color: #fff; border-color: var(--teal); }

@media (max-width: 860px) {
  .nav-toggle { display: inline-flex; }
  .nav-links {
    position: absolute; top: 68px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: .15rem;
    background: var(--paper); border-bottom: 1px solid var(--line);
    padding: .75rem 1.5rem 1.25rem; display: none;
    box-shadow: var(--shadow);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: .7rem .8rem; }
}

/* ---------- focus visibility ---------- */
a:focus-visible, button:focus-visible, .opt:focus-visible, summary:focus-visible {
  outline: 3px solid var(--gold); outline-offset: 2px; border-radius: 4px;
}

/* ---------- hero ---------- */
.hero { padding: 4.5rem 0 3rem; position: relative; overflow: hidden; }
.hero .eyebrow { font-family: var(--mono); text-transform: uppercase; letter-spacing: .18em; font-size: .75rem; color: var(--teal-dark); margin: 0 0 1rem; }
.hero h1 {
  font-family: var(--serif); font-weight: 600; letter-spacing: -.02em;
  font-size: clamp(2.2rem, 6vw, 3.8rem); line-height: 1.05; margin: 0 0 1.1rem; max-width: 16ch;
}
.hero h1 .mark { color: var(--teal); font-style: italic; }
.hero p.lead { font-size: 1.2rem; color: var(--ink-soft); max-width: 54ch; margin: 0 0 1.8rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  font-family: var(--sans); font-weight: 700; font-size: 1rem;
  text-decoration: none; cursor: pointer; border: none;
  padding: .8rem 1.4rem; border-radius: 999px; transition: transform .12s, background .15s, box-shadow .15s;
}
.btn-primary { background: var(--ink); color: #fff; }
.btn-primary:hover { background: var(--teal-dark); transform: translateY(-1px); box-shadow: var(--shadow); }
.btn-ghost { background: transparent; color: var(--ink); border: 1.5px solid var(--line); }
.btn-ghost:hover { border-color: var(--teal); color: var(--teal-dark); }
.btn-accent { background: var(--teal); color: #fff; }
.btn-accent:hover { background: var(--teal-dark); transform: translateY(-1px); box-shadow: var(--shadow); }

/* ---------- structure diagram (signature motif) ---------- */
.struct-flow {
  display: inline-flex; align-items: stretch; gap: 0; border-radius: var(--radius-sm);
  overflow: hidden; border: 1px solid var(--line); background: #fff; font-family: var(--mono);
  font-size: .72rem; font-weight: 600; letter-spacing: .04em; box-shadow: var(--shadow);
}
.struct-flow span { padding: .5rem .85rem; color: var(--ink-soft); display: inline-flex; align-items: center; }
.struct-flow span + span { border-left: 1px solid var(--line); }
.struct-flow .s-in { background: var(--teal-soft); color: var(--teal-dark); }
.struct-flow .s-mid { background: var(--gold-soft); color: #8a6d12; }
.struct-flow .s-slot { background: var(--coral-soft); color: #b34a2a; }

/* ---------- section headings ---------- */
.section { padding: 3.5rem 0; }
.section.alt { background: var(--paper-2); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.kicker { font-family: var(--mono); text-transform: uppercase; letter-spacing: .16em; font-size: .72rem; color: var(--teal-dark); margin: 0 0 .6rem; }
h2 { font-family: var(--serif); font-weight: 600; letter-spacing: -.015em; font-size: clamp(1.6rem, 3.5vw, 2.4rem); line-height: 1.15; margin: 0 0 1rem; }
h3 { font-family: var(--serif); font-weight: 600; font-size: 1.35rem; margin: 2rem 0 .6rem; letter-spacing: -.01em; }
h4 { font-family: var(--sans); font-weight: 700; font-size: 1.05rem; margin: 1.4rem 0 .4rem; }
p { margin: 0 0 1rem; }
a { color: var(--teal-dark); }

/* ---------- grid of structure cards ---------- */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1.2rem; }
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.4rem 1.4rem 1.5rem; text-decoration: none; color: var(--ink);
  display: flex; flex-direction: column; gap: .6rem; transition: transform .15s, box-shadow .15s, border-color .15s;
  position: relative; overflow: hidden;
}
.card::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: var(--teal); opacity: .8; }
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: var(--teal); }
.card .num { font-family: var(--mono); font-size: .8rem; color: var(--teal-dark); font-weight: 600; }
.card h3 { margin: 0; font-size: 1.25rem; }
.card p { margin: 0; color: var(--ink-soft); font-size: .98rem; }
.card .tag { margin-top: auto; font-family: var(--mono); font-size: .72rem; color: var(--ink-soft); }

/* ---------- prose blocks ---------- */
.prose { max-width: 720px; }
.prose ul, .prose ol { margin: 0 0 1.2rem; padding-left: 1.3rem; }
.prose li { margin-bottom: .4rem; }

.callout {
  border-radius: var(--radius); padding: 1.1rem 1.3rem; margin: 1.6rem 0;
  border: 1px solid var(--line); background: #fff; box-shadow: var(--shadow);
}
.callout .c-label { font-family: var(--mono); font-size: .72rem; text-transform: uppercase; letter-spacing: .12em; font-weight: 600; margin: 0 0 .35rem; }
.callout.good { background: var(--teal-soft); border-color: #bcd9cf; }
.callout.good .c-label { color: var(--teal-dark); }
.callout.warn { background: var(--coral-soft); border-color: #f3cdc0; }
.callout.warn .c-label { color: #b34a2a; }
.callout.tip { background: var(--gold-soft); border-color: #ead9a5; }
.callout.tip .c-label { color: #8a6d12; }
.callout p:last-child { margin-bottom: 0; }

/* example text block */
.example {
  background: #fff; border: 1px solid var(--line); border-left: 4px solid var(--gold);
  border-radius: var(--radius-sm); padding: 1.1rem 1.3rem; margin: 1.2rem 0; font-size: 1rem;
}
.example .ex-label { font-family: var(--mono); font-size: .72rem; text-transform: uppercase; letter-spacing: .12em; color: #8a6d12; font-weight: 600; display: block; margin-bottom: .4rem; }

/* signal words */
.signals { display: flex; flex-wrap: wrap; gap: .45rem; margin: 1rem 0 1.6rem; }
.signals .sig { font-family: var(--mono); font-size: .82rem; background: var(--teal-soft); color: var(--teal-dark); padding: .3rem .7rem; border-radius: 999px; border: 1px solid #bcd9cf; }

/* ---------- structure detail header ---------- */
.struct-hero { padding: 3rem 0 2rem; border-bottom: 1px solid var(--line); }
.struct-hero .crumb { font-family: var(--mono); font-size: .78rem; color: var(--ink-soft); margin-bottom: 1rem; }
.struct-hero .crumb a { color: var(--ink-soft); }
.struct-hero h1 { font-family: var(--serif); font-weight: 600; font-size: clamp(2rem, 5vw, 3rem); letter-spacing: -.02em; margin: .4rem 0 .8rem; line-height: 1.08; }
.struct-hero p.lead { font-size: 1.18rem; color: var(--ink-soft); max-width: 56ch; }

/* table for the schema */
.schema-table { width: 100%; border-collapse: collapse; margin: 1.5rem 0; font-size: .98rem; background: #fff; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.schema-table th, .schema-table td { text-align: left; padding: .85rem 1rem; border-bottom: 1px solid var(--line); vertical-align: top; }
.schema-table thead th { background: var(--ink); color: #fff; font-family: var(--mono); font-size: .72rem; text-transform: uppercase; letter-spacing: .1em; }
.schema-table tbody tr:last-child td { border-bottom: none; }
.schema-table tbody th { background: var(--paper-2); font-family: var(--sans); }

/* ---------- exercise page ---------- */
.exercise-text {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.6rem 1.8rem; box-shadow: var(--shadow); margin: 1.5rem 0;
}
.exercise-text h2 { font-size: 1.5rem; margin-top: 0; }
.exercise-text .meta { font-family: var(--mono); font-size: .74rem; color: var(--ink-soft); text-transform: uppercase; letter-spacing: .08em; margin-bottom: 1rem; }
.exercise-text p { margin-bottom: 1rem; }

.quiz { background: var(--paper-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.6rem 1.8rem; margin: 1.5rem 0; }
.quiz h3 { margin-top: 0; }
.options { list-style: none; margin: 1rem 0 0; padding: 0; display: flex; flex-direction: column; gap: .7rem; }
.opt {
  display: flex; gap: .75rem; align-items: flex-start; width: 100%; text-align: left;
  background: #fff; border: 1.5px solid var(--line); border-radius: var(--radius-sm);
  padding: .85rem 1rem; cursor: pointer; font: inherit; color: var(--ink); transition: border-color .15s, background .15s;
}
.opt:hover { border-color: var(--teal); }
.opt .letter { flex: 0 0 auto; font-family: var(--mono); font-weight: 600; color: var(--teal-dark); }
.opt.correct { background: var(--teal-soft); border-color: var(--teal); }
.opt.incorrect { background: var(--coral-soft); border-color: var(--coral); }
.opt[disabled] { cursor: default; }

.feedback { margin-top: 1.2rem; padding: 1.1rem 1.3rem; border-radius: var(--radius-sm); display: none; border: 1px solid var(--line); }
.feedback.show { display: block; }
.feedback.ok { background: var(--teal-soft); border-color: #bcd9cf; }
.feedback.no { background: var(--coral-soft); border-color: #f3cdc0; }
.feedback .f-title { font-weight: 700; margin: 0 0 .4rem; }
.feedback p:last-child { margin-bottom: 0; }

.quiz-nav { display: flex; flex-wrap: wrap; gap: .7rem; margin-top: 1.5rem; align-items: center; }
.oef-progress { font-family: var(--mono); font-size: .78rem; color: var(--ink-soft); text-transform: uppercase; letter-spacing: .08em; margin: 0 .3rem; }

/* ---------- FAQ ---------- */
.faq details {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-sm);
  padding: 0 1.3rem; margin-bottom: .8rem; box-shadow: var(--shadow);
}
.faq summary { cursor: pointer; font-weight: 700; padding: 1.1rem 0; list-style: none; display: flex; justify-content: space-between; gap: 1rem; font-size: 1.05rem; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-family: var(--mono); color: var(--teal); font-size: 1.4rem; line-height: 1; }
.faq details[open] summary::after { content: "–"; }
.faq details > p { padding: 0 0 1.2rem; margin: 0; color: var(--ink-soft); }

/* ---------- link page ---------- */
.linklist { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px,1fr)); gap: 1rem; }
.linklist .lcard { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 1.2rem 1.3rem; }
.linklist .lcard h3 { margin: 0 0 .4rem; font-size: 1.1rem; }
.linklist .lcard p { margin: 0; color: var(--ink-soft); font-size: .95rem; }
.linklist .lcard .placeholder { font-family: var(--mono); font-size: .8rem; color: var(--coral); }
.linklist a.lcard-link { display: block; text-decoration: none; color: inherit; transition: transform .15s, box-shadow .15s, border-color .15s; }
.linklist a.lcard-link:hover, .linklist a.lcard-link:focus-visible { transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: var(--teal); }
.linklist a.lcard-link h3 { color: var(--ink); }
.linklist a.lcard-link .link-note { margin-top: .6rem; font-size: .92rem; }
.linklist a.lcard-link .link-name { color: var(--teal-dark); font-weight: 700; }
.linklist a.lcard-link:hover .link-name { text-decoration: underline; }

/* ---------- contact / generic ---------- */
.contact-box { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 1.6rem 1.8rem; box-shadow: var(--shadow); }

/* ---------- footer ---------- */
.site-footer { background: var(--ink); color: #cdd6e6; margin-top: 4rem; }
.site-footer .wrap { padding-top: 3rem; padding-bottom: 2rem; }
.foot-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 2rem; }
.site-footer h4 { color: #fff; font-family: var(--mono); font-size: .74rem; text-transform: uppercase; letter-spacing: .12em; margin: 0 0 .9rem; }
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin-bottom: .45rem; }
.site-footer a { color: #cdd6e6; text-decoration: none; font-size: .95rem; }
.site-footer a:hover { color: #fff; text-decoration: underline; }
.site-footer .foot-brand b { font-family: var(--serif); color: #fff; font-size: 1.15rem; }
.site-footer .foot-brand p { color: #9fb0cb; font-size: .92rem; max-width: 32ch; margin-top: .6rem; }
.foot-bottom { border-top: 1px solid #2c3e60; margin-top: 2rem; padding-top: 1.3rem; font-size: .85rem; color: #8da1c0; display: flex; flex-wrap: wrap; justify-content: space-between; gap: .8rem; }

@media (max-width: 720px) { .foot-grid { grid-template-columns: 1fr; gap: 1.6rem; } }

/* ---------- pager / overview list ---------- */
.oef-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px,1fr)); gap: 1.1rem; }
.oef-card { background:#fff; border:1px solid var(--line); border-radius: var(--radius); padding: 1.2rem 1.3rem; text-decoration:none; color: var(--ink); display:flex; flex-direction:column; gap:.4rem; transition: transform .15s, box-shadow .15s, border-color .15s; }
.oef-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: var(--teal); }
.oef-card .o-struct { font-family: var(--mono); font-size: .74rem; color: var(--teal-dark); text-transform: uppercase; letter-spacing: .06em; }
.oef-card h3 { margin: 0; font-size: 1.12rem; }
.oef-card p { margin: 0; color: var(--ink-soft); font-size: .92rem; }
.oef-card.seen { border-color: var(--teal); background: var(--teal-soft); }
.oef-card.seen .o-struct { color: var(--teal-dark); }
.oef-card.seen .o-struct::before { content: "✓ "; }

/* utility */
.lead-list { list-style:none; padding:0; margin: 1.5rem 0; }
.lead-list li { padding-left: 1.6rem; position: relative; margin-bottom: .7rem; }
.lead-list li::before { content: "→"; position: absolute; left: 0; color: var(--teal); font-weight: 700; }
.center { text-align: center; }
.mt0 { margin-top: 0; }
hr.rule { border: none; border-top: 1px solid var(--line); margin: 2.5rem 0; }