/* Robotlab — instrumentpanel på millimeterpapir.
   Papir og blæk fra teknisk tegning; orange bruges kun til levende data. */

:root {
  --paper:      #EDF0F2;
  --panel:      #F8FAFB;
  --line:       #D8E0E5;
  --line-bold:  #C3CED5;
  --ink:        #16232E;
  --soft:       #657580;
  --signal:     #E8590C;
  --teal:       #0E7C86;
  --blue:       #2E5C8A;
  --violet:     #7048A0;

  --sans: "IBM Plex Sans", ui-sans-serif, system-ui, sans-serif;
  --cond: "IBM Plex Sans Condensed", "IBM Plex Sans", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;

  --rail-w: 250px;
  --top-h: 56px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  background-image:
    linear-gradient(to right, rgba(195,206,213,0.35) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(195,206,213,0.35) 1px, transparent 1px);
  background-size: 28px 28px;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.62;
}

a { color: var(--blue); }

/* --- topbar -------------------------------------------------------------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  height: var(--top-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 18px;
  background: var(--ink);
  color: var(--paper);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: inherit;
}

.brand-mark {
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 3px solid var(--signal);
  flex: none;
}

.brand-name {
  font-family: var(--cond);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.topnav {
  display: flex;
  gap: 4px;
  font-family: var(--mono);
  font-size: 12px;
}

.topnav a {
  color: rgba(237,240,242,0.72);
  text-decoration: none;
  padding: 7px 11px;
  border-radius: 3px;
  display: flex;
  align-items: center;
  gap: 7px;
}

.topnav a:hover { color: #fff; background: rgba(255,255,255,0.09); }
.topnav a.on { color: var(--ink); background: var(--paper); }

.due-pill {
  background: var(--signal);
  color: #fff;
  font-weight: 600;
  border-radius: 9px;
  padding: 1px 7px;
  font-size: 11px;
}

.topnav a.on .due-pill { background: var(--signal); }

/* --- layout -------------------------------------------------------------- */

.shell {
  display: grid;
  grid-template-columns: var(--rail-w) minmax(0, 1fr);
  align-items: start;
  max-width: 1360px;
  margin: 0 auto;
}

.rail {
  position: sticky;
  top: var(--top-h);
  max-height: calc(100vh - var(--top-h));
  overflow-y: auto;
  padding: 22px 12px 40px 18px;
}

main {
  padding: 26px 30px 90px;
  min-width: 0;
  outline: none;
}

/* --- rail ---------------------------------------------------------------- */

.rail-title {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--soft);
  margin: 0 0 12px 8px;
}

.rail-item {
  display: block;
  text-decoration: none;
  color: var(--ink);
  padding: 9px 10px;
  border-left: 2px solid var(--line-bold);
  margin-bottom: 2px;
}

.rail-item:hover { background: rgba(255,255,255,0.7); }
.rail-item.on { border-left-color: var(--signal); background: #fff; }

.rail-item-head {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.rail-num {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--soft);
}

.rail-name {
  font-family: var(--cond);
  font-weight: 600;
  font-size: 15.5px;
  letter-spacing: 0.005em;
}

.bar {
  height: 3px;
  background: var(--line-bold);
  margin-top: 7px;
  position: relative;
  overflow: hidden;
}

.bar > i {
  position: absolute;
  inset: 0 auto 0 0;
  background: var(--teal);
  transition: width 0.5s cubic-bezier(0.2, 0.7, 0.3, 1);
}

/* --- generel typografi --------------------------------------------------- */

.eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--soft);
  margin: 0 0 6px;
}

h1 {
  font-family: var(--cond);
  font-weight: 700;
  font-size: clamp(30px, 5.2vw, 46px);
  line-height: 1.05;
  letter-spacing: -0.012em;
  margin: 0 0 6px;
}

h2 {
  font-family: var(--cond);
  font-weight: 700;
  font-size: 23px;
  letter-spacing: 0.002em;
  margin: 0 0 10px;
}

h3 {
  font-family: var(--cond);
  font-weight: 600;
  font-size: 18px;
  margin: 0 0 8px;
}

.tagline {
  color: var(--soft);
  font-size: 17px;
  margin: 0 0 22px;
  max-width: 60ch;
}

code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: rgba(22,35,46,0.07);
  padding: 1px 5px;
  border-radius: 2px;
}

pre {
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.65;
  background: var(--ink);
  color: #E7EDF1;
  padding: 14px 16px;
  overflow-x: auto;
  margin: 14px 0;
  border-radius: 2px;
}

pre code { background: none; padding: 0; color: inherit; }

/* --- kort ---------------------------------------------------------------- */

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 20px 22px;
  margin-bottom: 18px;
}

.panel--flush { padding: 0; overflow: hidden; }

/* --- simulation ---------------------------------------------------------- */

.sim {
  border: 1px solid var(--line-bold);
  background: #fff;
  margin: 0 0 26px;
}

.sim-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding: 12px 18px;
  border-bottom: 1px solid var(--line);
  background: var(--ink);
  color: var(--paper);
}

.sim-head h2 { margin: 0; color: #fff; font-size: 19px; }

.sim-tag {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(237,240,242,0.62);
}

.sim-body { padding: 16px 18px 20px; }

.sim-help {
  margin: 0 0 14px;
  color: var(--soft);
  font-size: 14.5px;
  max-width: 68ch;
}

.sim-canvas-wrap { width: 100%; }
.sim-canvas { display: block; width: 100%; border: 1px solid var(--line-bold); touch-action: none; }

.sim-readout {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin-top: -1px;
  border: 1px solid var(--line-bold);
  border-top: none;
  background: var(--panel);
}

.ro {
  flex: 1 1 128px;
  padding: 9px 12px;
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.ro:last-child { border-right: none; }

.ro-label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--soft);
}

.ro-value {
  font-family: var(--mono);
  font-size: 16px;
  font-weight: 500;
  color: var(--signal);
  font-variant-numeric: tabular-nums;
}

.sim-controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 12px 22px;
  margin-top: 18px;
}

.ctl { display: flex; flex-direction: column; gap: 3px; }

.ctl-head { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; }

.ctl-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--soft);
  text-transform: uppercase;
}

.ctl-value {
  font-family: var(--mono);
  font-size: 12.5px;
  font-weight: 500;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.ctl-range {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 22px;
  background: none;
  cursor: pointer;
}

.ctl-range::-webkit-slider-runnable-track { height: 3px; background: var(--line-bold); }
.ctl-range::-moz-range-track { height: 3px; background: var(--line-bold); }

.ctl-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 15px; height: 15px;
  background: var(--signal);
  border-radius: 50%;
  margin-top: -6px;
  border: none;
}

.ctl-range::-moz-range-thumb {
  width: 15px; height: 15px;
  background: var(--signal);
  border: none;
  border-radius: 50%;
}

.ctl-range:focus-visible { outline: 2px solid var(--blue); outline-offset: 3px; }

.ctl-toggle {
  flex-direction: row;
  align-items: center;
  gap: 9px;
  cursor: pointer;
  text-transform: none;
}

.ctl-toggle input { accent-color: var(--signal); width: 16px; height: 16px; flex: none; }
.ctl-toggle .ctl-label { text-transform: none; letter-spacing: 0; font-size: 12.5px; }

.ctl-button {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  background: #fff;
  color: var(--ink);
  border: 1px solid var(--line-bold);
  padding: 8px 12px;
  cursor: pointer;
  border-radius: 2px;
}

.ctl-button:hover { border-color: var(--ink); }
.ctl-button:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; }

.ctl-button-row { display: flex; flex-wrap: wrap; gap: 7px; grid-column: 1 / -1; }

.ctl-pad {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 62px));
  gap: 7px;
  grid-column: 1 / -1;
}

.pad-button { font-size: 16px; padding: 11px 0; touch-action: manipulation; user-select: none; }

/* --- lektioner ----------------------------------------------------------- */

.lesson {
  border-top: 1px solid var(--line-bold);
  padding: 20px 0 6px;
}

.lesson:first-of-type { border-top: none; }

.lesson-head {
  display: flex;
  align-items: baseline;
  gap: 11px;
  margin-bottom: 4px;
}

.lesson-step {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--soft);
  border: 1px solid var(--line-bold);
  padding: 1px 6px;
  flex: none;
}

.lesson-body { max-width: 68ch; }
.lesson-body p { margin: 0 0 13px; }
.lesson-body ul { margin: 0 0 13px; padding-left: 20px; }
.lesson-body li { margin-bottom: 6px; }
.lesson-body em { font-style: italic; }

.lesson-mark {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--soft);
  background: none;
  border: none;
  padding: 6px 0;
  cursor: pointer;
}

.lesson-mark .box {
  width: 14px; height: 14px;
  border: 1.5px solid var(--line-bold);
  display: inline-block;
  flex: none;
}

.lesson-mark.done { color: var(--teal); }
.lesson-mark.done .box { background: var(--teal); border-color: var(--teal); }

/* --- quiz ---------------------------------------------------------------- */

.quiz-q { border-top: 1px solid var(--line); padding: 18px 0; }
.quiz-q:first-of-type { border-top: none; }

.quiz-prompt { font-weight: 500; margin: 0 0 12px; max-width: 66ch; }

.quiz-opts { display: flex; flex-direction: column; gap: 7px; max-width: 620px; }

.quiz-opt {
  text-align: left;
  font: inherit;
  font-size: 15px;
  background: #fff;
  border: 1px solid var(--line-bold);
  padding: 10px 13px;
  cursor: pointer;
  display: flex;
  gap: 11px;
  align-items: baseline;
  border-radius: 2px;
}

.quiz-opt:hover:not(:disabled) { border-color: var(--ink); }
.quiz-opt:disabled { cursor: default; }
.quiz-opt .key { font-family: var(--mono); font-size: 11px; color: var(--soft); flex: none; }
.quiz-opt.right { border-color: var(--teal); background: rgba(14,124,134,0.09); }
.quiz-opt.right .key { color: var(--teal); }
.quiz-opt.wrong { border-color: var(--signal); background: rgba(232,89,12,0.08); }
.quiz-opt.wrong .key { color: var(--signal); }

.quiz-why {
  margin: 11px 0 0;
  font-size: 14.5px;
  color: var(--soft);
  border-left: 2px solid var(--line-bold);
  padding-left: 12px;
  max-width: 66ch;
}

.quiz-score {
  font-family: var(--mono);
  font-size: 13px;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--line-bold);
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

/* --- repetition ---------------------------------------------------------- */

.card-stage {
  border: 1px solid var(--line-bold);
  background: #fff;
  min-height: 260px;
  display: flex;
  flex-direction: column;
}

.card-meta {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 18px;
  border-bottom: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--soft);
}

.card-face {
  padding: 30px 26px;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 18px;
}

.card-front { font-family: var(--cond); font-weight: 600; font-size: clamp(20px, 3.4vw, 27px); line-height: 1.25; }

.card-back {
  border-top: 1px solid var(--line-bold);
  padding-top: 17px;
  font-size: 16px;
  color: #253645;
  max-width: 62ch;
}

.grade-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 7px; margin-top: 16px; }

.grade {
  font-family: var(--mono);
  font-size: 12px;
  padding: 12px 4px;
  border: 1px solid var(--line-bold);
  background: #fff;
  cursor: pointer;
  border-radius: 2px;
  display: flex;
  flex-direction: column;
  gap: 3px;
  align-items: center;
}

.grade:hover { border-color: var(--ink); }
.grade b { font-weight: 600; font-size: 13px; }
.grade span { font-size: 10px; color: var(--soft); font-variant-numeric: tabular-nums; }
.grade[data-g="0"]:hover { border-color: var(--signal); }
.grade[data-g="3"]:hover { border-color: var(--teal); }

/* --- oversigt ------------------------------------------------------------ */

.stat-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  border: 1px solid var(--line-bold);
  background: var(--panel);
  margin-bottom: 26px;
}

.stat { padding: 14px 16px; border-right: 1px solid var(--line); }
.stat:last-child { border-right: none; }

.stat-label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--soft);
}

.stat-value {
  font-family: var(--mono);
  font-size: 27px;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  line-height: 1.25;
}

.module-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 14px; }

.module-card {
  display: block;
  text-decoration: none;
  color: inherit;
  background: var(--panel);
  border: 1px solid var(--line-bold);
  padding: 16px 18px 18px;
  transition: border-color 0.15s, transform 0.15s;
}

.module-card:hover { border-color: var(--ink); transform: translateY(-2px); }

.module-card .mc-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--soft);
  margin-bottom: 5px;
}

.module-card h3 { margin: 0 0 4px; }
.module-card p { margin: 0 0 12px; font-size: 14.5px; color: var(--soft); }

.pct { font-family: var(--mono); font-variant-numeric: tabular-nums; color: var(--teal); font-weight: 500; }

.empty {
  border: 1px dashed var(--line-bold);
  padding: 34px 24px;
  text-align: center;
  color: var(--soft);
  background: var(--panel);
}

.empty strong { display: block; font-family: var(--cond); font-size: 21px; color: var(--ink); margin-bottom: 5px; }

.foot {
  margin-top: 42px;
  padding-top: 16px;
  border-top: 1px solid var(--line-bold);
  font-family: var(--mono);
  font-size: 11px;
  color: var(--soft);
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  align-items: center;
}

.linkish {
  background: none;
  border: none;
  font: inherit;
  color: var(--soft);
  text-decoration: underline;
  cursor: pointer;
  padding: 0;
}

.linkish:hover { color: var(--signal); }

.toast {
  position: fixed;
  left: 50%;
  bottom: 22px;
  transform: translateX(-50%);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 12.5px;
  padding: 10px 18px;
  border-radius: 2px;
  z-index: 90;
  box-shadow: 0 6px 22px rgba(22,35,46,0.24);
}

/* --- responsivt ---------------------------------------------------------- */

@media (max-width: 900px) {
  .shell { grid-template-columns: 1fr; }

  .rail {
    position: static;
    max-height: none;
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding: 12px 14px;
    border-bottom: 1px solid var(--line-bold);
    background: rgba(248,250,251,0.9);
    -webkit-overflow-scrolling: touch;
  }

  .rail-title { display: none; }

  .rail-item {
    flex: 0 0 auto;
    width: 168px;
    border-left: none;
    border-top: 2px solid var(--line-bold);
    padding: 8px 10px;
  }

  .rail-item.on { border-top-color: var(--signal); }

  main { padding: 20px 16px 80px; }
  .sim-body { padding: 14px 13px 18px; }
  .sim-head { padding: 11px 14px; }
  .panel { padding: 16px 15px; }
  .grade-row { grid-template-columns: repeat(2, 1fr); }
  .stat-value { font-size: 23px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; }

/* --- sprogvælger --------------------------------------------------------- */

.lang {
  display: flex;
  margin-left: 6px;
  border: 1px solid rgba(237,240,242,0.28);
  border-radius: 3px;
  overflow: hidden;
}

.lang button {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  background: none;
  border: none;
  color: rgba(237,240,242,0.7);
  padding: 6px 9px;
  cursor: pointer;
}

.lang button:hover { color: #fff; background: rgba(255,255,255,0.1); }
.lang button.on { background: var(--signal); color: #fff; }
.lang button:focus-visible { outline: 2px solid var(--paper); outline-offset: -2px; }

@media (max-width: 460px) {
  .topbar { padding: 0 12px; gap: 8px; }
  .brand-name { font-size: 16px; letter-spacing: 0.1em; }
  .topnav a { padding: 7px 8px; font-size: 11px; }
  .lang button { padding: 6px 7px; }
}