:root {
  --bg: #f6f4ef;
  --surface: #ffffff;
  --text: #1f1d1a;
  --muted: #6d675e;
  --border: #e3ded4;
  --accent: #b4532a;
  --board: #efe6d6;
  --fret: #b9ab95;
  --string: #8a7f70;
  --nut: #3b342c;
  --inlay: #d9ccb6;
  --ok: #2f8a4c;
  --wrong: #c43d3d;
  --inv-R: #d0582e;
  --inv-1: #2f6fc0;
  --inv-2: #2f9a6a;
  --dot-text: #ffffff;
  --radius: 12px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #161513;
    --surface: #211f1c;
    --text: #ece8e1;
    --muted: #a39b8f;
    --border: #36322c;
    --accent: #e07a4b;
    --board: #2b2722;
    --fret: #5d554a;
    --string: #8f8574;
    --nut: #d8d0c2;
    --inlay: #3d3730;
    --ok: #4fbf72;
    --wrong: #ec6a6a;
    --inv-R: #ec7a4f;
    --inv-1: #5c9be6;
    --inv-2: #4cc28c;
    --dot-text: #111;
  }
}
:root[data-theme="dark"] {
  --bg: #161513; --surface: #211f1c; --text: #ece8e1; --muted: #a39b8f; --border: #36322c;
  --accent: #e07a4b; --board: #2b2722; --fret: #5d554a; --string: #8f8574; --nut: #d8d0c2;
  --inlay: #3d3730; --ok: #4fbf72; --wrong: #ec6a6a; --inv-R: #ec7a4f; --inv-1: #5c9be6;
  --inv-2: #4cc28c; --dot-text: #111;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
a { color: inherit; }
.wrap { max-width: 1000px; margin: 0 auto; padding: 0 16px; }
.muted { color: var(--muted); font-weight: normal; }
.small { font-size: 0.875rem; }
.center { text-align: center; }

/* Kleur per omkering: gebruik class inv-R / inv-1 / inv-2 */
.inv-R { --inv: var(--inv-R); }
.inv-1 { --inv: var(--inv-1); }
.inv-2 { --inv: var(--inv-2); }
i:empty { display: inline-block; width: 10px; height: 10px; border-radius: 50%; background: var(--inv, var(--muted)); margin-right: 6px; vertical-align: 0; }

/* ---------- Header / navigatie ---------- */
.site-header { background: var(--surface); border-bottom: 1px solid var(--border); margin-bottom: 20px; }
.header-inner { display: flex; align-items: center; gap: 20px; padding-top: 12px; padding-bottom: 8px; flex-wrap: wrap; }
.brand { font-weight: 700; text-decoration: none; font-size: 1.1rem; }
.main-nav { display: flex; gap: 4px; flex-wrap: wrap; }
.main-nav a {
  text-decoration: none; padding: 4px 12px; border-radius: 999px; color: var(--muted); font-weight: 600;
}
.main-nav a.active { background: var(--accent); color: #fff; }
.sub-nav { display: flex; gap: 18px; overflow-x: auto; }
.sub-nav a {
  text-decoration: none; padding: 8px 0 10px; color: var(--muted); border-bottom: 2px solid transparent; white-space: nowrap;
}
.sub-nav a.active { color: var(--text); border-bottom-color: var(--accent); font-weight: 600; }

/* ---------- Kaarten ---------- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 16px;
  min-width: 0;
}
.toolbar { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 8px; }
.board-title { font-size: 1.15rem; margin: 6px 0 10px; font-weight: 500; }

/* Segmented control */
.seg { display: inline-flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.seg button {
  font: inherit; font-size: 0.875rem; padding: 5px 12px; border: 0; background: transparent; color: var(--muted); cursor: pointer;
}
.seg button + button { border-left: 1px solid var(--border); }
.seg button.active { background: var(--text); color: var(--surface); }

/* ---------- Fretboard ---------- */
.fb-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; padding-bottom: 4px; }
.fretboard { display: block; width: 100%; height: auto; }
.fretboard text { text-anchor: middle; dominant-baseline: central; font-family: inherit; }
.fb-fret { stroke: var(--fret); stroke-width: 2; }
.fb-nut { stroke: var(--nut); stroke-width: 6; stroke-linecap: round; }
.fb-string { stroke: var(--string); }
.fb-inlay { fill: var(--inlay); }
.fb-num { fill: var(--muted); font-size: 11px; }
.fb-num-mark { fill: var(--text); font-weight: 700; }
.fb-sname { fill: var(--muted); font-size: 13px; font-weight: 600; }
.fb-link { fill: none; stroke: var(--inv, var(--muted)); stroke-width: 5; stroke-linejoin: round; stroke-linecap: round; opacity: 0.35; }
.fb-dot circle { fill: var(--inv, var(--accent)); }
.fb-dot.is-root circle { stroke: var(--text); stroke-width: 2.5; }
.fb-dot text { fill: var(--dot-text); font-size: 12px; font-weight: 700; }
.fb-dot.dim, .fb-link.dim { opacity: 0.22; }

.legend { display: flex; gap: 16px; flex-wrap: wrap; font-size: 0.875rem; color: var(--muted); margin-top: 8px; }

/* ---------- Cheatsheet-tabel ---------- */
.cs-table { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
.cs-table th, .cs-table td { padding: 8px 10px; text-align: left; border-bottom: 1px solid var(--border); }
.cs-table thead th { font-size: 0.85rem; color: var(--muted); font-weight: 600; }
.cs-table tbody th { width: 70px; }
.cs-table tbody tr { cursor: pointer; }
.cs-table tbody tr:hover { background: color-mix(in srgb, var(--accent) 7%, transparent); }
.cs-table tbody tr.selected { background: color-mix(in srgb, var(--accent) 16%, transparent); }
.cs-table tbody tr:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }

/* ---------- Quiz ---------- */
.quiz-layout > .card { margin-bottom: 0; }
.quiz-layout { display: grid; grid-template-columns: minmax(0, 1fr) 240px; gap: 16px; align-items: start; }
@media (max-width: 760px) {
  .quiz-layout { grid-template-columns: minmax(0, 1fr); }
}
.quiz-stats { display: flex; justify-content: space-between; color: var(--muted); font-size: 0.9rem; }
.quiz-stats strong { color: var(--text); }
.quiz-key { font-size: 4.5rem; font-weight: 800; text-align: center; line-height: 1.1; margin: 8px 0 0; }
.quiz-form { max-width: 420px; margin: 12px auto 4px; display: grid; gap: 10px; }
.field { display: grid; grid-template-columns: 1fr 110px; align-items: center; gap: 4px 10px; }
.field-label { font-weight: 600; }
.field input {
  font: inherit; font-size: 1.15rem; padding: 8px 10px; border-radius: 8px; width: 100%;
  border: 2px solid var(--border); background: var(--bg); color: var(--text); text-align: center;
}
.field input:focus { outline: none; border-color: var(--inv, var(--accent)); }
.field.ok input { border-color: var(--ok); }
.field.wrong input { border-color: var(--wrong); }
.field-answer { grid-column: 1 / -1; text-align: right; font-size: 0.9rem; font-weight: 600; }
.field.ok .field-answer { color: var(--ok); }
.field.wrong .field-answer { color: var(--wrong); }

.btn-primary {
  font: inherit; font-weight: 700; padding: 10px 16px; border: 0; border-radius: 8px; cursor: pointer;
  background: var(--accent); color: #fff; margin-top: 4px;
}
.btn-primary:focus-visible { outline: 3px solid color-mix(in srgb, var(--accent) 40%, transparent); outline-offset: 2px; }
.btn-link { font: inherit; font-size: 0.85rem; background: none; border: 0; color: var(--muted); text-decoration: underline; cursor: pointer; padding: 0; margin-top: 16px; display: block; }

.quiz-result { margin-top: 16px; border-top: 1px solid var(--border); padding-top: 8px; }

.quiz-settings h3 { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); margin: 14px 0 6px; }
.quiz-settings h3:first-child { margin-top: 0; }
.check { display: flex; align-items: center; gap: 8px; padding: 3px 0; cursor: pointer; }
.check i:empty { margin-right: 0; }
.check input { accent-color: var(--accent); width: 18px; height: 18px; }

/* ---------- Noten op de hals ---------- */
.note-nat { --inv: var(--accent); }
.note-acc { --inv: var(--muted); }
.note-hl { --inv: var(--inv-1); }
.note-q { --inv: var(--accent); }
.note-ok { --inv: var(--ok); }
.note-wrong { --inv: var(--wrong); }
.fb-dot.note-acc text { font-size: 10.5px; }

.note-picker { display: flex; flex-wrap: wrap; gap: 6px; margin: 4px 0 8px; }
.note-picker button, .note-pad button {
  font: inherit; font-weight: 700; min-width: 42px; padding: 6px 8px; border-radius: 8px; cursor: pointer;
  border: 1px solid var(--border); background: var(--bg); color: var(--text);
}
.note-picker button.acc { font-weight: 500; color: var(--muted); }
.note-picker button.active { background: var(--inv-1); border-color: var(--inv-1); color: #fff; }
.note-pad { display: grid; gap: 6px; }
.note-pad > div { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; }
.note-pad button { min-width: 46px; padding: 10px 8px; font-size: 1.05rem; }
.note-pad button:hover, .note-picker button:hover { border-color: var(--accent); }

.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.notes-table thead th[data-pc] { cursor: pointer; }
.notes-table tbody tr { cursor: default; }
.notes-table tbody tr:hover { background: none; }
.notes-table .col-hl { background: color-mix(in srgb, var(--inv-1) 16%, transparent); }
.notes-table th, .notes-table td { text-align: center; white-space: nowrap; }

.quiz-prompt { font-size: 1.2rem; font-weight: 600; margin: 10px 0 6px; }
.quiz-sub { font-size: 1.1rem; margin: 0 0 4px; }
.quiz-settings .seg { display: flex; width: 100%; }
.quiz-settings .seg button { flex: 1; padding: 5px 6px; }

/* ---------- Akkoorden ---------- */
.chordchart { display: block; width: 100%; height: auto; }
.chordchart text { text-anchor: middle; dominant-baseline: central; font-family: inherit; }
.cc-fret { stroke: var(--fret); stroke-width: 1.5; }
.cc-nut { stroke: var(--nut); stroke-width: 5; stroke-linecap: round; }
.cc-string { stroke: var(--string); stroke-width: 1.2; }
.cc-mute { fill: var(--muted); font-size: 15px; }
.cc-open { fill: none; stroke: var(--text); stroke-width: 1.5; }
.cc-open.is-root { stroke: var(--accent); stroke-width: 2.5; }
.cc-barre { fill: var(--text); opacity: 0.85; }
.cc-dot circle { fill: var(--text); }
.cc-dot.is-root circle { fill: var(--accent); }
.cc-dot text { fill: var(--surface); font-size: 10px; font-weight: 700; }
.cc-below { fill: var(--muted); font-size: 9.5px; font-weight: 600; }
.cc-below.is-root { fill: var(--accent); }

.chord-detail { display: grid; grid-template-columns: 200px minmax(0, 1fr); gap: 20px; align-items: start; margin-top: 8px; }
.chord-detail p { margin: 6px 0; }
@media (max-width: 520px) { .chord-detail { grid-template-columns: 150px minmax(0, 1fr); gap: 12px; } }
code.tab { font: 600 0.95rem ui-monospace, Consolas, monospace; background: var(--bg); border: 1px solid var(--border); border-radius: 6px; padding: 1px 6px; }

.chord-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(104px, 1fr)); gap: 10px; }
.chord-card {
  font: inherit; color: inherit; background: var(--bg); border: 1px solid var(--border); border-radius: 10px;
  padding: 6px 8px 4px; cursor: pointer; text-align: center;
}
.chord-card:hover { border-color: var(--accent); }
.chord-card.selected { border-color: var(--accent); box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 35%, transparent); }
.chord-name { display: block; font-weight: 700; margin-bottom: 2px; }

.chord-quiz { width: 190px; margin: 6px auto; }
.chord-pad > div { gap: 6px; }
.chord-pad button { min-width: 58px; }
.field-answer-line { font-weight: 600; margin: 4px 0; }
.field-answer-line.ok { color: var(--ok); }
.field-answer-line.wrong { color: var(--wrong); }
.seg button { white-space: nowrap; }
.toolbar .seg { flex-wrap: wrap; max-width: 100%; }
@media (max-width: 520px) { .chord-grid { grid-template-columns: repeat(auto-fill, minmax(90px, 1fr)); gap: 8px; } }
.quiz-settings .seg[data-multi="quizSets"] { display: grid; grid-template-columns: 1fr 1fr; }
.quiz-settings .seg[data-multi="quizSets"] button:nth-child(3) { border-left: 0; }
.quiz-settings .seg[data-multi="quizSets"] button:nth-child(n+3) { border-top: 1px solid var(--border); }