/* ADE Studietool — styles */
:root {
  --bg: #f3efe6;              /* warm papier */
  --surface: #fbf9f3;
  --surface-2: #ebe4d6;
  --ink: #231e18;             /* warm bijna-zwart */
  --ink-soft: #594f44;
  --ink-faint: #8f8372;
  --line: #e0d8c7;
  --accent: #7c2f2b;          /* oxbloed / burgundy */
  --accent-soft: #ecdcd4;
  --accent-ink: #60221e;
  --accent-contrast: #fdf7f2; /* tekst op accent-vlak */
  --mark: #f2d481;            /* warme arcering */
  --mark-ink: #4b3906;
  --danger: #a23a2c;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(45,35,25,.05), 0 10px 30px rgba(45,35,25,.07);
  --mono: ui-monospace, "SF Mono", "Cascadia Code", Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --serif: "Spectral", Georgia, "Iowan Old Style", "Times New Roman", serif;
}
:root:not([data-theme="light"]) {
  @media (prefers-color-scheme: dark) {
    --bg: #17130d;
    --surface: #201b13;
    --surface-2: #2b241a;
    --ink: #ece3d4;
    --ink-soft: #bcb09b;
    --ink-faint: #897d69;
    --line: #342c20;
    --accent: #d98c68;        /* warme terracotta */
    --accent-soft: #3a2a20;
    --accent-ink: #f1c6ad;
    --accent-contrast: #211912;
    --mark: #6f5720;
    --mark-ink: #ffe6a6;
    --shadow: 0 1px 2px rgba(0,0,0,.5), 0 12px 34px rgba(0,0,0,.42);
  }
}
:root[data-theme="dark"] {
  --bg: #17130d; --surface: #201b13; --surface-2: #2b241a;
  --ink: #ece3d4; --ink-soft: #bcb09b; --ink-faint: #897d69; --line: #342c20;
  --accent: #d98c68; --accent-soft: #3a2a20; --accent-ink: #f1c6ad; --accent-contrast: #211912;
  --mark: #6f5720; --mark-ink: #ffe6a6;
  --shadow: 0 1px 2px rgba(0,0,0,.5), 0 12px 34px rgba(0,0,0,.42);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, .brand-mark, .cc-title, .source-title { font-family: var(--serif); }
.hero h1, .paper-head h1 { letter-spacing: -0.01em; }

/* Topbar */
.topbar {
  position: sticky; top: 0; z-index: 30;
  display: flex; align-items: center; gap: 12px;
  padding: 10px 16px;
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: saturate(1.3) blur(8px);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: baseline; gap: 8px; min-width: 0; }
.brand-mark {
  font-weight: 800; letter-spacing: .5px; color: var(--accent);
  font-size: 1.15rem;
}
.brand-sub { color: var(--ink-faint); font-size: .82rem; white-space: nowrap;
  overflow: hidden; text-overflow: ellipsis; }
.top-actions { margin-left: auto; display: flex; align-items: center; gap: 8px; }
#search {
  width: min(260px, 40vw); padding: 7px 11px; border-radius: 999px;
  border: 1px solid var(--line); background: var(--surface-2); color: var(--ink);
  font-size: .88rem;
}
#search:focus { outline: 2px solid var(--accent); border-color: transparent; }
.icon-btn {
  border: 1px solid var(--line); background: var(--surface-2); color: var(--ink);
  width: 36px; height: 36px; border-radius: 10px; cursor: pointer; font-size: 1rem;
  display: inline-grid; place-items: center;
}
.icon-btn:hover { border-color: var(--accent); }
#menuBtn { display: none; }

/* Layout */
.layout { display: grid; grid-template-columns: 290px minmax(0,1fr); gap: 0; }
.sidebar {
  border-right: 1px solid var(--line);
  height: calc(100dvh - 57px); position: sticky; top: 57px; overflow-y: auto;
  background: var(--surface); padding: 14px 10px 24px;
}
.main { padding: 26px clamp(16px, 4vw, 48px); max-width: 1100px; }

/* Nav */
.col-group { margin-bottom: 6px; }
.col-head {
  display: flex; gap: 8px; align-items: center; width: 100%;
  background: none; border: 0; text-align: left; cursor: pointer;
  padding: 9px 10px; border-radius: 10px; color: var(--ink); font: inherit;
}
.col-head:hover { background: var(--surface-2); }
.col-head .nr {
  flex: none; width: 24px; height: 24px; border-radius: 7px; display: grid;
  place-items: center; font-size: .78rem; font-weight: 700;
  background: var(--accent); color: var(--accent-contrast);
}
.col-head.empty .nr { background: var(--surface-2); color: var(--ink-faint);
  border: 1px solid var(--line); }
.col-head .ctitle { font-size: .9rem; font-weight: 600; line-height: 1.25; }
.col-head .chev { margin-left: auto; color: var(--ink-faint); transition: transform .15s; }
.col-group.open .chev { transform: rotate(90deg); }
.col-papers { display: none; padding: 2px 0 8px 34px; }
.col-group.open .col-papers { display: block; }
.paper-link, .paper-dim {
  display: block; padding: 6px 10px; border-radius: 8px; font-size: .84rem;
  color: var(--ink-soft); text-decoration: none; cursor: pointer; border: 0;
  background: none; text-align: left; width: 100%; font: inherit; line-height: 1.3;
}
.paper-link:hover { background: var(--surface-2); color: var(--ink); }
.paper-link.active { background: var(--accent); color: var(--accent-contrast); }
.paper-dim { color: var(--ink-faint); cursor: default; }
.paper-dim .todo { font-size: .72rem; color: var(--ink-faint); font-style: italic; }
.scope-chip { display:block; font-size: .72rem; color: var(--ink-faint); margin-top: 1px; }
.sidebar-foot { padding: 12px 10px 0; color: var(--ink-faint); font-size: .76rem; }

/* Home */
.hero { margin-bottom: 26px; }
.hero h1 { font-size: 1.7rem; margin: 0 0 6px; }
.hero p { color: var(--ink-soft); margin: 0; max-width: 60ch; }
.card-grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fill,minmax(240px,1fr)); }
.ccard {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 16px; box-shadow: var(--shadow); cursor: pointer; text-align: left;
  font: inherit; color: inherit; display: flex; flex-direction: column; gap: 8px;
}
.ccard:hover { border-color: var(--accent); transform: translateY(-1px); }
.ccard[aria-disabled="true"] { cursor: default; opacity: .72; }
.ccard[aria-disabled="true"]:hover { transform: none; border-color: var(--line); }
.ccard .cc-nr { font-size: .75rem; font-weight: 700; color: var(--accent); letter-spacing: .4px; }
.ccard .cc-title { font-size: 1.02rem; font-weight: 650; line-height: 1.25; }
.ccard .cc-meta { font-size: .8rem; color: var(--ink-faint); margin-top: auto; }
.badge { display:inline-block; font-size:.7rem; padding:2px 8px; border-radius:999px;
  background: var(--surface-2); color: var(--ink-faint); border:1px solid var(--line); }
.badge.ready { background: color-mix(in srgb, var(--accent) 16%, transparent);
  color: var(--accent-ink); border-color: transparent; }

/* Paper view */
.paper-head { margin-bottom: 18px; }
.crumbs { font-size: .8rem; color: var(--ink-faint); margin-bottom: 10px; }
.crumbs a { color: var(--ink-faint); text-decoration: none; }
.crumbs a:hover { color: var(--accent); }
.paper-head h1 { font-size: 1.5rem; margin: 0 0 6px; line-height: 1.25; }
.paper-head .meta { color: var(--ink-soft); font-size: .9rem; }
.scope-banner {
  margin-top: 12px; padding: 10px 14px; border-radius: 10px; font-size: .86rem;
  background: var(--surface-2); border: 1px dashed var(--line); color: var(--ink-soft);
}
.scope-banner b { color: var(--ink); }
.oneliner { margin-top:16px; font-family: var(--serif); font-size:1.18rem; font-style: italic;
  line-height:1.55; color:var(--ink); padding-left:16px; border-left:3px solid var(--accent); }

.tabs { display: flex; gap: 6px; margin: 22px 0 18px; border-bottom: 1px solid var(--line); }
.tab {
  border: 0; background: none; color: var(--ink-soft); cursor: pointer; font: inherit;
  padding: 9px 14px; border-bottom: 2px solid transparent; margin-bottom: -1px;
  font-weight: 550; font-size: .92rem;
}
.tab:hover { color: var(--ink); }
.tab.active { color: var(--accent); border-bottom-color: var(--accent); }

/* Summary */
.summary { font-family: var(--serif); font-size: 1.05rem; line-height: 1.72; }
.summary section { margin-bottom: 24px; }
.summary h2 {
  font-size: 1.1rem; margin: 0 0 8px; display: flex; align-items: center; gap: 9px;
}
.summary h2 .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); }
.summary p { margin: 0 0 12px; }
.summary ul, .summary ol { margin: 2px 0 14px; padding-left: 24px; }
.summary li { margin-bottom: 7px; }
.summary li::marker { color: var(--accent); }
.summary h3 { font-size: .98rem; margin: 16px 0 6px; color: var(--ink); }

/* Schema / tabel */
.tbl-wrap { margin: 6px 0 18px; overflow-x: auto; -webkit-overflow-scrolling: touch; }
table.schema { border-collapse: collapse; width: 100%; font-family: var(--sans);
  font-size: .88rem; line-height: 1.45; }
table.schema th, table.schema td { border: 1px solid var(--line); padding: 8px 11px;
  text-align: left; vertical-align: top; }
table.schema thead th { background: color-mix(in srgb, var(--accent) 12%, var(--surface-2));
  color: var(--ink); font-weight: 650; }
table.schema tbody th { background: var(--surface-2); font-weight: 600; white-space: nowrap; }
table.schema tbody tr:nth-child(even) td { background: color-mix(in srgb, var(--surface-2) 45%, transparent); }
.tbl-cap { font-size: .8rem; color: var(--ink-faint); margin-top: 5px; font-family: var(--sans); }

/* Callout / kernbegrip-box */
.callout { background: color-mix(in srgb, var(--accent) 8%, var(--surface-2));
  border-left: 3px solid var(--accent); border-radius: 8px; padding: 11px 15px;
  margin: 6px 0 16px; font-size: 1rem; }
.callout-label { display: block; font-family: var(--sans); font-size: .72rem;
  text-transform: uppercase; letter-spacing: .6px; font-weight: 700;
  color: var(--accent-ink); margin-bottom: 3px; }
.callout.tip { border-left-color: var(--ink-faint); }
.cite {
  cursor: pointer; border: 0; background: color-mix(in srgb, var(--accent) 14%, transparent);
  color: var(--accent-ink); font-size: .7rem; font-weight: 700; vertical-align: super;
  padding: 1px 6px; border-radius: 6px; margin-left: 3px; line-height: 1;
  font-family: var(--mono);
}
.cite:hover { background: var(--accent); color: var(--accent-contrast); }

/* Flashcards */
.fc-wrap { max-width: 640px; }
.fc-progress { color: var(--ink-faint); font-size: .85rem; margin-bottom: 10px; }
.flashcard {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 30px 26px; min-height: 190px; cursor: pointer;
  display: grid; place-items: center; text-align: center; position: relative;
}
.flashcard .side-label { position:absolute; top:12px; left:16px; font-size:.7rem;
  text-transform:uppercase; letter-spacing:.8px; color: var(--ink-faint); }
.flashcard .fc-text { font-family: var(--serif); font-size: 1.18rem; line-height: 1.55; }
.flashcard.is-answer { border-color: var(--accent); }
.fc-controls { display: flex; gap: 10px; margin-top: 16px; align-items: center; }
.btn {
  border: 1px solid var(--line); background: var(--surface); color: var(--ink);
  padding: 9px 16px; border-radius: 10px; cursor: pointer; font: inherit; font-weight: 550;
}
.btn:hover { border-color: var(--accent); }
.btn.primary { background: var(--accent); color: var(--accent-contrast); border-color: transparent; }
.btn.primary:hover { filter: brightness(1.05); }
.btn:disabled { opacity: .5; cursor: default; }

/* Quiz */
.quiz { max-width: 720px; }
.q-item { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px 18px 14px; margin-bottom: 14px; box-shadow: var(--shadow); }
.q-item .q-type { font-size:.72rem; text-transform:uppercase; letter-spacing:.6px;
  color: var(--ink-faint); margin-bottom: 6px; }
.q-item .q-text { font-weight: 600; margin-bottom: 12px; }
.opt { display: block; width: 100%; text-align: left; padding: 10px 13px; margin-bottom: 8px;
  border: 1px solid var(--line); border-radius: 10px; background: var(--surface-2);
  cursor: pointer; font: inherit; color: var(--ink); }
.opt:hover { border-color: var(--accent); }
.opt.correct { background: color-mix(in srgb, var(--accent) 22%, transparent);
  border-color: var(--accent); color: var(--accent-ink); font-weight: 600; }
.opt.wrong { background: color-mix(in srgb, var(--danger) 16%, transparent);
  border-color: var(--danger); }
.opt.disabled { cursor: default; }
.explain { font-size: .86rem; color: var(--ink-soft); margin-top: 6px;
  padding: 9px 12px; background: var(--surface-2); border-radius: 8px; border-left: 3px solid var(--accent); }
.explain[hidden] { display: none; }
.open-answer { margin-top: 8px; }
.open-answer textarea { width:100%; min-height:72px; border:1px solid var(--line);
  border-radius:10px; padding:10px; font:inherit; background:var(--surface-2); color:var(--ink); resize:vertical; }
.model-answer { margin-top: 8px; }

/* Source panel */
.source-panel {
  position: fixed; top: 57px; right: 0; width: min(560px, 92vw);
  height: calc(100dvh - 57px); background: var(--surface); border-left: 1px solid var(--line);
  box-shadow: -12px 0 40px rgba(16,32,43,.18); z-index: 40; display: flex; flex-direction: column;
  transform: translateX(100%); transition: transform .22s ease;
}
.source-panel.open { transform: translateX(0); }
.source-head { display: flex; gap: 12px; align-items: flex-start; justify-content: space-between;
  padding: 14px 16px; border-bottom: 1px solid var(--line); }
.source-title { font-weight: 650; font-size: .95rem; }
.source-note { font-size: .76rem; color: var(--ink-faint); margin-top: 2px; max-width: 42ch; }
.source-body { overflow-y: auto; padding: 16px 18px 60px; font-family: var(--serif);
  font-size: .95rem; line-height: 1.7; color: var(--ink-soft); }
.source-body p { margin: 0 0 12px; scroll-margin-top: 16px; }
.source-body mark { background: var(--mark); color: var(--mark-ink); padding: 1px 2px; border-radius: 3px; }
.source-body p.flash { animation: flash 1.4s ease; }
@keyframes flash { 0%,100% { background: transparent; } 20% { background: color-mix(in srgb, var(--mark) 55%, transparent); } }
.source-loading { color: var(--ink-faint); font-style: italic; }

.backdrop { position: fixed; inset: 57px 0 0 0; background: rgba(8,14,20,.4); z-index: 35; }

.empty-note { color: var(--ink-faint); font-style: italic; padding: 20px 0; }
.reading-list { list-style:none; padding:0; margin:14px 0 0; }
.reading-list li { padding:10px 0; border-bottom:1px solid var(--line); }
.reading-list .rl-ref { font-weight:600; }
.reading-list .rl-scope { font-size:.84rem; color:var(--ink-faint); }

/* Responsive */
@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; }
  #menuBtn { display: inline-grid; }
  .sidebar {
    position: fixed; top: 57px; left: 0; z-index: 38; width: 300px; max-width: 86vw;
    transform: translateX(-100%); transition: transform .2s ease;
  }
  .sidebar.open { transform: translateX(0); box-shadow: var(--shadow); }
  .brand-sub { display: none; }
  #search { width: 44vw; }
}