/* ============================================================
   A320 Study Trainer — ECAM cockpit-display theme
   Palette derived from the real A320 ECAM colour language:
   green = normal, amber = caution, red = warning, cyan = info.
   ============================================================ */
:root {
  --bg:        #05080d;
  --panel:     #0c1420;
  --panel-2:   #101c2c;
  --line:      #1e2c3e;
  --line-soft: #16222f;

  --green:  #33e07a;   /* correct / normal */
  --amber:  #ffb300;   /* caution / eyebrow accent */
  --red:    #ff4d45;   /* wrong / warning */
  --cyan:   #35c8e6;   /* interactive / info */
  --magenta:#d98cff;

  --text:   #e4ebf3;
  --dim:    #8394a5;
  --dimmer: #5a6b7d;

  --radius: 4px;
  --mono: 'IBM Plex Mono', ui-monospace, 'SF Mono', Menlo, monospace;
  --disp: 'Barlow Semi Condensed', 'Arial Narrow', sans-serif;
  --body: 'Inter', system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--body);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  background-image:
    radial-gradient(1100px 600px at 80% -10%, rgba(53,200,230,.06), transparent),
    radial-gradient(900px 500px at -10% 110%, rgba(255,179,0,.05), transparent);
  min-height: 100vh;
}
[hidden] { display: none !important; }

h1, h2, h3 { font-family: var(--disp); letter-spacing: .01em; margin: 0; }
h1 { font-size: 30px; font-weight: 700; }
h2 { font-size: 26px; font-weight: 700; }

.eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--amber);
  display: inline-block;
}
.lede { color: var(--dim); max-width: 60ch; margin: 8px 0 0; }
.ecam-dot {
  display: inline-block; width: 9px; height: 9px; border-radius: 50%;
  background: var(--green); box-shadow: 0 0 8px var(--green);
}

/* ---------- buttons ---------- */
.btn {
  font-family: var(--disp); font-weight: 600; font-size: 15px;
  letter-spacing: .03em; text-transform: uppercase;
  border: 1px solid transparent; border-radius: var(--radius);
  padding: 11px 20px; cursor: pointer; color: var(--text);
  background: transparent; transition: background .12s, border-color .12s, color .12s;
}
.btn:focus-visible { outline: 2px solid var(--cyan); outline-offset: 2px; }
.btn-primary { background: var(--cyan); color: #04121a; }
.btn-primary:hover { background: #5ad6ef; }
.btn-secondary { border-color: var(--line); background: var(--panel-2); }
.btn-secondary:hover { border-color: var(--cyan); color: var(--cyan); }
.btn-ghost { border-color: var(--line); color: var(--dim); }
.btn-ghost:hover { color: var(--text); border-color: var(--dim); }
.btn-block { width: 100%; display: block; margin-top: 6px; }
.btn-sm { padding: 7px 13px; font-size: 13px; }
.btn:disabled { opacity: .5; cursor: default; }

/* ---------- inputs ---------- */
input, select {
  width: 100%; background: #060b12; border: 1px solid var(--line);
  color: var(--text); border-radius: var(--radius); padding: 10px 12px;
  font-family: var(--mono); font-size: 14px; margin-bottom: 14px;
}
input:focus, select:focus { outline: none; border-color: var(--cyan); }
label { display: block; font-family: var(--mono); font-size: 11px; letter-spacing: .16em;
  text-transform: uppercase; color: var(--dim); margin-bottom: 6px; }
.form-error { color: var(--red); font-family: var(--mono); font-size: 13px; margin-top: 8px; }

/* ---------- login ---------- */
.login-wrap { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
.login-card {
  width: 100%; max-width: 400px; background: var(--panel);
  border: 1px solid var(--line); border-radius: 8px; padding: 34px 30px;
  box-shadow: 0 30px 80px rgba(0,0,0,.5);
}
.ecam-brand { font-family: var(--mono); font-size: 12px; letter-spacing: .22em;
  color: var(--dim); display: flex; align-items: center; gap: 9px; margin-bottom: 22px; }
.login-card h1 { font-size: 27px; line-height: 1.05; }
.login-sub { color: var(--dim); margin: 8px 0 24px; }
.login-card form label:first-of-type { margin-top: 4px; }
.login-foot { color: var(--dimmer); font-size: 12px; text-align: center; margin: 20px 0 0;
  font-family: var(--mono); letter-spacing: .05em; }

/* ---------- topbar ---------- */
.topbar {
  display: flex; align-items: center; gap: 20px;
  padding: 0 22px; height: 58px; border-bottom: 1px solid var(--line);
  background: rgba(6,11,18,.85); backdrop-filter: blur(8px);
  position: sticky; top: 0; z-index: 20;
}
.topbar-brand { font-family: var(--mono); font-size: 13px; letter-spacing: .16em;
  color: var(--text); display: flex; align-items: center; gap: 9px; cursor: pointer; }
.topbar-nav { display: flex; gap: 4px; margin-left: 8px; }
.navlink {
  background: transparent; border: none; color: var(--dim);
  font-family: var(--disp); font-size: 15px; font-weight: 600; letter-spacing: .03em;
  text-transform: uppercase; padding: 8px 12px; border-radius: var(--radius); cursor: pointer;
}
.navlink:hover { color: var(--text); }
.navlink.active { color: var(--cyan); background: rgba(53,200,230,.09); }
.topbar-user { margin-left: auto; display: flex; align-items: center; gap: 14px; }
.who { font-family: var(--mono); font-size: 13px; color: var(--dim); }
.who b { color: var(--text); font-weight: 600; }

.main { max-width: 1040px; margin: 0 auto; padding: 34px 22px 80px; }
.view-head { margin-bottom: 26px; }
.view-head h2 { margin-top: 6px; }

/* ---------- builder ---------- */
.builder { display: grid; grid-template-columns: 1fr 320px; gap: 22px; align-items: start; }
.cat-tree { display: flex; flex-direction: column; gap: 12px; }
.cat-block { border: 1px solid var(--line); border-radius: 6px; background: var(--panel); overflow: hidden; }
.cat-head {
  display: flex; align-items: center; gap: 12px; padding: 14px 16px; cursor: pointer;
  border-bottom: 1px solid transparent;
}
.cat-head:hover { background: var(--panel-2); }
.cat-name { font-family: var(--disp); font-weight: 600; font-size: 18px; letter-spacing: .02em; }
.cat-count { font-family: var(--mono); font-size: 12px; color: var(--dim); margin-left: auto; }
.cat-caret { color: var(--dim); font-family: var(--mono); transition: transform .15s; }
.cat-block.open .cat-caret { transform: rotate(90deg); }
.cat-block.open .cat-head { border-bottom-color: var(--line-soft); }
.sub-list { padding: 6px 8px 10px; display: none; }
.cat-block.open .sub-list { display: block; }
.check-row {
  display: flex; align-items: center; gap: 11px; padding: 9px 10px;
  border-radius: var(--radius); cursor: pointer;
}
.check-row:hover { background: var(--panel-2); }
.check-row .sub-count { margin-left: auto; font-family: var(--mono); font-size: 12px; color: var(--dimmer); }
.check-row span.lbl { font-size: 14px; }

/* custom checkbox */
.cbx { appearance: none; width: 17px; height: 17px; min-width: 17px; border: 1px solid var(--line);
  border-radius: 3px; background: #060b12; position: relative; cursor: pointer; margin: 0; padding: 0; }
.cbx:checked { border-color: var(--cyan); background: var(--cyan); }
.cbx:checked::after { content: ""; position: absolute; left: 5px; top: 1px; width: 4px; height: 9px;
  border: solid #04121a; border-width: 0 2px 2px 0; transform: rotate(45deg); }
.cbx:focus-visible { outline: 2px solid var(--cyan); outline-offset: 2px; }

/* builder side */
.builder-side .panel { position: sticky; top: 80px; }
.panel { border: 1px solid var(--line); border-radius: 6px; background: var(--panel); padding: 18px; }
.panel-title { font-family: var(--mono); font-size: 11px; letter-spacing: .2em; text-transform: uppercase;
  color: var(--dim); margin: 4px 0 12px; }
.panel-title + .panel-title { margin-top: 22px; }
.seg { display: flex; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.seg-btn { flex: 1; background: transparent; border: none; color: var(--dim); padding: 9px;
  font-family: var(--disp); font-weight: 600; text-transform: uppercase; letter-spacing: .04em; cursor: pointer; }
.seg-btn.active { background: var(--cyan); color: #04121a; }
.mode-desc { color: var(--dim); font-size: 12.5px; margin: 12px 0 0; }
.count-row { display: flex; align-items: center; gap: 12px; }
.count-row input { margin-bottom: 0; }
.count-hint { font-family: var(--mono); font-size: 12px; color: var(--dim); white-space: nowrap; }
#start-btn { margin-top: 22px; }

/* ---------- test ---------- */
.test-bar { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-bottom: 22px; flex-wrap: wrap; }
.test-progress { flex: 1; min-width: 200px; }
.q-index { font-family: var(--mono); font-size: 12px; letter-spacing: .1em; color: var(--dim); }
.progress-track { height: 3px; background: var(--line); border-radius: 3px; margin-top: 8px; overflow: hidden; }
.progress-fill { height: 100%; width: 0; background: var(--cyan); transition: width .3s; }
.test-controls { display: flex; align-items: center; gap: 16px; }

.toggle { display: inline-flex; align-items: center; gap: 10px; cursor: pointer; user-select: none; }
.toggle input { display: none; }
.toggle-track { width: 40px; height: 22px; border-radius: 22px; background: var(--line); position: relative; transition: background .15s; }
.toggle-thumb { position: absolute; top: 2px; left: 2px; width: 18px; height: 18px; border-radius: 50%; background: var(--dim); transition: left .15s, background .15s; }
.toggle input:checked + .toggle-track { background: rgba(51,224,122,.3); }
.toggle input:checked + .toggle-track .toggle-thumb { left: 20px; background: var(--green); }
.toggle-label { font-family: var(--mono); font-size: 12px; color: var(--dim); text-transform: none; letter-spacing: 0; }

.q-card { border: 1px solid var(--line); border-radius: 8px; background: var(--panel); padding: 26px; }
.q-cat { font-family: var(--mono); font-size: 11px; letter-spacing: .22em; text-transform: uppercase; color: var(--amber); }
.q-text { font-size: 19px; line-height: 1.45; margin: 12px 0 22px; }
.q-options { display: flex; flex-direction: column; gap: 10px; }
.opt {
  display: flex; align-items: center; gap: 14px; text-align: left;
  border: 1px solid var(--line); background: #070d15; color: var(--text);
  border-radius: var(--radius); padding: 14px 16px; cursor: pointer; font-size: 15px;
  font-family: var(--body); transition: border-color .12s, background .12s;
}
.opt:hover:not(:disabled) { border-color: var(--cyan); }
.opt:disabled { cursor: default; }
.opt .key { font-family: var(--mono); font-weight: 600; color: var(--dim); min-width: 16px; }
.opt.selected { border-color: var(--cyan); }
.opt.correct { border-color: var(--green); background: rgba(51,224,122,.10); }
.opt.correct .key { color: var(--green); }
.opt.wrong { border-color: var(--red); background: rgba(255,77,69,.10); }
.opt.wrong .key { color: var(--red); }
.opt:focus-visible { outline: 2px solid var(--cyan); outline-offset: 2px; }

/* ECAM message feedback */
.ecam-feedback { margin-top: 20px; border-top: 1px solid var(--line); padding-top: 18px; font-family: var(--mono); }
.ecam-line { font-size: 15px; letter-spacing: .04em; display: flex; align-items: center; gap: 10px; }
.ecam-line::before { content: ""; width: 8px; height: 8px; border-radius: 50%; }
.ecam-line.ok { color: var(--green); }
.ecam-line.ok::before { background: var(--green); box-shadow: 0 0 8px var(--green); }
.ecam-line.no { color: var(--red); }
.ecam-line.no::before { background: var(--red); box-shadow: 0 0 8px var(--red); }
.ecam-expl { color: var(--dim); font-family: var(--body); font-size: 14px; margin-top: 10px; line-height: 1.55; }

.q-footer { display: flex; justify-content: flex-end; margin-top: 20px; }

/* comments */
.comments { margin-top: 18px; border-top: 1px solid var(--line-soft); padding-top: 16px; }
.comments-title { font-family: var(--mono); font-size: 11px; letter-spacing: .18em; text-transform: uppercase; color: var(--dim); margin-bottom: 12px; }
.comment { padding: 10px 0; border-bottom: 1px solid var(--line-soft); }
.comment:last-child { border-bottom: none; }
.comment-meta { font-family: var(--mono); font-size: 11px; color: var(--dim); display: flex; gap: 10px; align-items: center; }
.comment-meta b { color: var(--cyan); font-weight: 600; }
.comment-del { margin-left: auto; background: none; border: none; color: var(--dimmer); cursor: pointer; font-family: var(--mono); font-size: 11px; }
.comment-del:hover { color: var(--red); }
.comment-text { font-size: 14px; margin-top: 4px; white-space: pre-wrap; }
.comment-form { display: flex; gap: 10px; margin-top: 12px; }
.comment-form input { margin-bottom: 0; font-family: var(--body); }
.comment-empty { color: var(--dimmer); font-family: var(--mono); font-size: 12px; }

/* ---------- results ---------- */
.results-head { display: flex; align-items: center; gap: 34px; flex-wrap: wrap; margin-bottom: 30px; }
.gauge { width: 168px; height: 168px; flex-shrink: 0; }
.results-summary h2 { font-size: 44px; margin: 6px 0; font-family: var(--disp); }
.results-actions { display: flex; gap: 10px; margin-top: 20px; flex-wrap: wrap; }

.review { display: flex; flex-direction: column; gap: 14px; }
.rev-card { border: 1px solid var(--line); border-left-width: 3px; border-radius: 6px; background: var(--panel); padding: 18px 20px; }
.rev-card.ok { border-left-color: var(--green); }
.rev-card.no { border-left-color: var(--red); }
.rev-top { display: flex; align-items: center; gap: 12px; }
.rev-cat { font-family: var(--mono); font-size: 10.5px; letter-spacing: .18em; text-transform: uppercase; color: var(--amber); }
.rev-status { margin-left: auto; font-family: var(--mono); font-size: 11px; letter-spacing: .1em; }
.rev-status.ok { color: var(--green); }
.rev-status.no { color: var(--red); }
.rev-q { font-size: 16px; margin: 10px 0 14px; }
.rev-opt { font-family: var(--mono); font-size: 13.5px; padding: 6px 10px; border-radius: 3px; margin-bottom: 5px; color: var(--dim); }
.rev-opt.correct { color: var(--green); background: rgba(51,224,122,.08); }
.rev-opt.chosen-wrong { color: var(--red); background: rgba(255,77,69,.08); }
.rev-expl { color: var(--dim); font-size: 13.5px; margin-top: 10px; line-height: 1.55; }
.rev-comments-toggle { margin-top: 12px; background: none; border: none; color: var(--cyan); font-family: var(--mono); font-size: 12px; cursor: pointer; padding: 0; }
.src-link { display: inline-block; margin-top: 12px; color: var(--cyan); font-family: var(--mono); font-size: 12px;
  text-decoration: none; border-bottom: 1px dotted var(--cyan); }
.src-link:hover { color: #5ad6ef; }

/* ---------- history & admin rows ---------- */
.history-list, .rows { display: flex; flex-direction: column; gap: 8px; }
.row {
  display: flex; align-items: center; gap: 16px; padding: 14px 18px;
  border: 1px solid var(--line); border-radius: 6px; background: var(--panel);
}
.row .r-mode { font-family: var(--mono); font-size: 11px; letter-spacing: .12em; text-transform: uppercase;
  color: var(--dim); border: 1px solid var(--line); border-radius: 3px; padding: 3px 8px; }
.row .r-name { font-family: var(--mono); color: var(--text); min-width: 120px; }
.row .r-date { font-family: var(--mono); font-size: 12.5px; color: var(--dim); }
.row .r-score { margin-left: auto; font-family: var(--disp); font-weight: 700; font-size: 22px; }
.row .r-pct { font-family: var(--mono); font-size: 13px; }
.row.clickable { cursor: pointer; }
.row.clickable:hover { border-color: var(--cyan); }
.pct-good { color: var(--green); }
.pct-mid { color: var(--amber); }
.pct-bad { color: var(--red); }

.admin-grid { display: grid; grid-template-columns: 340px 1fr; gap: 20px; margin-bottom: 20px; align-items: start; }
.urow { display: flex; align-items: center; gap: 12px; padding: 12px 14px; border: 1px solid var(--line); border-radius: 6px; background: var(--panel); }
.urow .u-name { font-family: var(--mono); color: var(--text); }
.urow .u-role { font-family: var(--mono); font-size: 11px; text-transform: uppercase; letter-spacing: .1em; padding: 2px 8px; border-radius: 3px; border: 1px solid var(--line); color: var(--dim); }
.urow .u-role.admin { color: var(--amber); border-color: rgba(255,179,0,.4); }
.urow .u-meta { margin-left: auto; font-family: var(--mono); font-size: 12px; color: var(--dim); }
.urow .icon-btn { background: none; border: none; color: var(--dimmer); cursor: pointer; font-family: var(--mono); font-size: 12px; }
.urow .icon-btn:hover { color: var(--red); }
.empty { color: var(--dimmer); font-family: var(--mono); font-size: 13px; padding: 14px 2px; }

/* ---------- resume banner ---------- */
.resume-banner {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  margin-bottom: 22px; border-color: var(--cyan); background: rgba(53,200,230,.06);
}
.resume-banner .eyebrow { color: var(--cyan); }
.resume-banner p { margin: 6px 0 0; }
.resume-actions { display: flex; gap: 10px; flex-shrink: 0; }

/* ---------- quick actions ---------- */
.quick-actions { display: flex; gap: 10px; margin-bottom: 18px; flex-wrap: wrap; }

/* ---------- exam timer ---------- */
.exam-timer {
  font-family: var(--mono); font-size: 14px; letter-spacing: .06em; color: var(--amber);
  border: 1px solid var(--line); border-radius: var(--radius); padding: 6px 12px;
}
.exam-timer.low { color: var(--red); border-color: var(--red); }

/* ---------- bookmark ---------- */
.q-top { display: flex; align-items: center; justify-content: space-between; }
.bookmark-btn {
  background: none; border: none; cursor: pointer; font-size: 22px; line-height: 1;
  color: var(--dim); padding: 2px 4px;
}
.bookmark-btn:hover { color: var(--amber); }
.bookmark-btn.active { color: var(--amber); }

/* ---------- stats ---------- */
.stats-overview { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 26px; }
.stat-tile {
  border: 1px solid var(--line); border-radius: 6px; background: var(--panel);
  padding: 16px 20px; min-width: 140px;
}
.stat-tile .stat-label { font-family: var(--mono); font-size: 11px; letter-spacing: .16em;
  text-transform: uppercase; color: var(--dim); }
.stat-tile .stat-value { font-family: var(--disp); font-weight: 700; font-size: 30px; margin-top: 6px; }
.stats-bars { display: flex; flex-direction: column; gap: 12px; }
.stat-bar-row { border: 1px solid var(--line); border-radius: 6px; background: var(--panel); padding: 14px 18px; }
.stat-bar-top { display: flex; justify-content: space-between; font-family: var(--mono); font-size: 13px; margin-bottom: 8px; }
.stat-bar-name { color: var(--text); }
.stat-bar-pct { color: var(--dim); }
.stat-bar-track { height: 8px; border-radius: 4px; background: var(--line-soft); overflow: hidden; }
.stat-bar-fill { height: 100%; border-radius: 4px; }

/* ---------- admin question bank ---------- */
.qbank-toolbar { display: flex; gap: 10px; align-items: center; margin-bottom: 14px; flex-wrap: wrap; }
.qbank-toolbar select { width: auto; min-width: 200px; margin-bottom: 0; }
.qbank-list { display: flex; flex-direction: column; gap: 8px; max-height: 560px; overflow-y: auto; }
.qbank-cat { border: 1px solid var(--line); border-radius: 6px; background: var(--panel); padding: 12px 16px; }
.qbank-cat-head { display: flex; align-items: center; gap: 10px; }
.qbank-cat-name { font-family: var(--disp); font-weight: 600; font-size: 16px; }
.qbank-cat-actions { margin-left: auto; display: flex; gap: 8px; }
.qbank-sub-name { font-family: var(--mono); font-size: 11px; letter-spacing: .12em; text-transform: uppercase;
  color: var(--amber); margin: 12px 0 6px; }
.qbank-q-row { display: flex; align-items: center; gap: 10px; padding: 8px 0; border-top: 1px solid var(--line-soft); }
.qbank-q-text { flex: 1; font-size: 13.5px; color: var(--text); overflow: hidden; text-overflow: ellipsis;
  white-space: nowrap; }
.qbank-q-actions { display: flex; gap: 8px; flex-shrink: 0; }

/* ---------- modal ---------- */
.modal {
  position: fixed; inset: 0; background: rgba(2,5,9,.75); display: grid; place-items: center;
  z-index: 50; padding: 20px;
}
.modal-card {
  width: 100%; max-width: 560px; max-height: 90vh; overflow-y: auto;
  background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 24px;
}
.qm-options { display: flex; flex-direction: column; gap: 8px; }
.qm-opt-row { display: flex; align-items: center; gap: 10px; }
.qm-opt-row input[type="text"] { margin-bottom: 0; flex: 1; }
.qm-opt-row input[type="radio"] { width: auto; margin: 0; flex-shrink: 0; }
.qm-opt-actions { display: flex; gap: 10px; margin: 10px 0 14px; }
.qm-form-actions { display: flex; gap: 10px; margin-top: 18px; }

/* ---------- responsive ---------- */
@media (max-width: 820px) {
  .builder { grid-template-columns: 1fr; }
  .builder-side .panel { position: static; }
  .admin-grid { grid-template-columns: 1fr; }
  .topbar { gap: 10px; padding: 0 14px; }
  .topbar-brand span:last-child { display: none; }
  .main { padding: 24px 14px 70px; }
  .results-head { gap: 20px; }
  h1 { font-size: 25px; } h2 { font-size: 22px; }
}
@media (max-width: 480px) {
  .test-controls { width: 100%; justify-content: space-between; }
  .row { flex-wrap: wrap; }
  .row .r-score { margin-left: 0; }
  .resume-banner { flex-direction: column; align-items: flex-start; }
}

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