/* ============================================================
   English Test Simulator — UAI International Management
   Single stylesheet. No dependencies.
   ============================================================ */

:root {
  --bg: #f7f7f5;
  --surface: #ffffff;
  --surface-2: #f1f1ee;
  --border: #e0e0da;
  --border-strong: #c9c9c1;
  --text: #1c1c1a;
  --text-muted: #6b6b64;
  --accent: #1f5f4f;
  --accent-soft: #e6f0ec;
  --accent-text: #ffffff;
  --good: #1f6b3f;
  --good-soft: #e5f2ea;
  --bad: #9b2c2c;
  --bad-soft: #f8e8e8;
  --warn: #8a5a00;
  --warn-soft: #fbf0da;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 1px 2px rgba(0,0,0,.04), 0 4px 16px rgba(0,0,0,.05);
  --mono: ui-monospace, SFMono-Regular, Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16171a;
    --surface: #1e2024;
    --surface-2: #26282d;
    --border: #33363c;
    --border-strong: #474b53;
    --text: #e8e8e6;
    --text-muted: #9a9a94;
    --accent: #5fbfa3;
    --accent-soft: #1c2f2a;
    --accent-text: #10201c;
    --good: #6fce96;
    --good-soft: #16281d;
    --bad: #ec8a8a;
    --bad-soft: #2d1a1a;
    --warn: #e0b061;
    --warn-soft: #2e2517;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 4px 16px rgba(0,0,0,.25);
  }
}

* { box-sizing: border-box; }

/* `hidden` must win over the display rules below (.modal, .timer, .view). */
[hidden] { display: none !important; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

h1, h2, h3, h4 { line-height: 1.25; margin: 0 0 .5em; font-weight: 650; letter-spacing: -.01em; }
h1 { font-size: 2rem; }
h2 { font-size: 1.35rem; }
h3 { font-size: 1.1rem; }
h4 { font-size: .8rem; text-transform: uppercase; letter-spacing: .06em; color: var(--text-muted); }
p { margin: 0 0 1em; }
.muted { color: var(--text-muted); }
.small { font-size: .85rem; }
.lede { font-size: 1.1rem; color: var(--text-muted); max-width: 60ch; }

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

.topbar {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.topbar-in {
  max-width: 1180px; margin: 0 auto; padding: .7rem 1.25rem;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
}
.brand { display: flex; align-items: center; gap: .6rem; font-weight: 650; }
.brand-mark {
  display: grid; place-items: center;
  width: 30px; height: 30px; border-radius: 8px;
  background: var(--accent); color: var(--accent-text);
  font-size: .75rem; letter-spacing: .02em;
}
.brand-text { font-size: .95rem; }
@media (max-width: 620px) { .brand-text { display: none; } }

.topbar-right { display: flex; align-items: center; gap: .75rem; }

.timer {
  display: flex; align-items: center; gap: .5rem;
  padding: .25rem .3rem .25rem .7rem;
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 999px;
}
.timer #timer-value { font: 600 .95rem/1 var(--mono); font-variant-numeric: tabular-nums; }
.timer.is-warning { background: var(--warn-soft); border-color: var(--warn); }
.timer.is-warning #timer-value { color: var(--warn); }
.timer.is-paused #timer-value { opacity: .45; }

.lang-toggle { display: flex; background: var(--surface-2); border: 1px solid var(--border); border-radius: 999px; padding: 2px; }
.lang-btn {
  border: 0; background: transparent; color: var(--text-muted);
  font: 600 .78rem/1 inherit; letter-spacing: .04em;
  padding: .38rem .7rem; border-radius: 999px; cursor: pointer;
}
.lang-btn.is-active { background: var(--surface); color: var(--text); box-shadow: var(--shadow); }

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

#main { max-width: 1180px; margin: 0 auto; padding: 2rem 1.25rem 5rem; }
.view { animation: fade .2s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(4px); } }

.hero { margin-bottom: 1.75rem; }
.section-head { margin: 2rem 0 1rem; }

/* ---------------- buttons ---------------- */

.btn {
  font: 600 .9rem/1 inherit;
  padding: .68rem 1.1rem; border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong); background: var(--surface); color: var(--text);
  cursor: pointer; transition: background .12s, border-color .12s, opacity .12s;
}
.btn:hover:not(:disabled) { background: var(--surface-2); }
.btn:disabled { opacity: .4; cursor: not-allowed; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.btn-primary:hover:not(:disabled) { background: color-mix(in srgb, var(--accent) 85%, black); }
.btn-ghost { background: transparent; border-color: transparent; color: var(--text-muted); }
.btn-ghost:hover:not(:disabled) { background: var(--surface-2); color: var(--text); }
.btn-sm { font-size: .8rem; padding: .42rem .7rem; }
.btn-block { display: block; width: 100%; margin-top: .5rem; }

/* ---------------- callout ---------------- */

.callout {
  background: var(--accent-soft); border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
  border-radius: var(--radius); padding: 1.1rem 1.25rem; margin-bottom: .5rem;
}
.callout h3 { margin-bottom: .4rem; }
.callout p:last-child { margin-bottom: 0; }

/* ---------------- test cards ---------------- */

/* 265px lets all four tests sit on one row of a typical laptop. */
.test-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(265px, 1fr)); gap: 1rem; }
.test-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.25rem; box-shadow: var(--shadow);
  display: flex; flex-direction: column;
}
.test-card h3 { margin-bottom: .15rem; }
.test-card .test-sub { color: var(--text-muted); font-size: .88rem; margin-bottom: .9rem; }
.test-meta { list-style: none; padding: 0; margin: 0 0 1rem; font-size: .85rem; color: var(--text-muted); }
.test-meta li { display: flex; justify-content: space-between; padding: .22rem 0; border-bottom: 1px dashed var(--border); }
.test-meta li:last-child { border-bottom: 0; }
.test-card .card-actions { margin-top: auto; display: flex; gap: .5rem; flex-wrap: wrap; }
.badge {
  display: inline-block; font-size: .72rem; font-weight: 650; letter-spacing: .03em;
  padding: .2rem .5rem; border-radius: 999px; background: var(--surface-2); color: var(--text-muted);
  border: 1px solid var(--border); white-space: nowrap;
}
.badge-good { background: var(--good-soft); color: var(--good); border-color: color-mix(in srgb, var(--good) 35%, transparent); }
.badge-warn { background: var(--warn-soft); color: var(--warn); border-color: color-mix(in srgb, var(--warn) 35%, transparent); }
.history { margin-top: .8rem; font-size: .8rem; color: var(--text-muted); }
.history-row { display: flex; justify-content: space-between; padding: .15rem 0; }

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

.exam-layout { display: grid; grid-template-columns: 250px 1fr; gap: 1.75rem; align-items: start; }
@media (max-width: 900px) { .exam-layout { grid-template-columns: 1fr; } .sidebar { order: 2; } }

.sidebar {
  position: sticky; top: 76px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.1rem; box-shadow: var(--shadow);
}
@media (max-width: 900px) { .sidebar { position: static; } }
.sidebar-block { margin-bottom: 1.25rem; }

.progress-bar { height: 6px; background: var(--surface-2); border-radius: 999px; overflow: hidden; margin-bottom: .4rem; }
.progress-fill { height: 100%; width: 0; background: var(--accent); transition: width .2s ease; }

.qgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(30px, 1fr)); gap: 4px; }
.qcell {
  aspect-ratio: 1; display: grid; place-items: center;
  font: 600 .7rem/1 var(--mono); cursor: pointer;
  border: 1px solid var(--border); border-radius: 4px;
  background: var(--surface); color: var(--text-muted);
  padding: 0; transition: transform .1s;
}
.qcell:hover { transform: scale(1.12); }
.qcell.is-done { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.qcell.is-flagged { background: var(--warn-soft); border-color: var(--warn); color: var(--warn); }
.qcell.is-current { outline: 2px solid var(--text); outline-offset: 1px; }

.legend { display: flex; flex-direction: column; gap: .25rem; margin-top: .7rem; font-size: .75rem; color: var(--text-muted); }
.legend span { display: flex; align-items: center; gap: .4rem; }
.dot { width: 9px; height: 9px; border-radius: 3px; display: inline-block; border: 1px solid var(--border); }
.dot-done { background: var(--accent); border-color: var(--accent); }
.dot-flag { background: var(--warn-soft); border-color: var(--warn); }
.dot-todo { background: var(--surface); }

/* ---------------- exam main ---------------- */

.exam-main { min-width: 0; }
.page-head { margin-bottom: 1.25rem; }
.page-head .eyebrow { font-size: .75rem; text-transform: uppercase; letter-spacing: .08em; color: var(--accent); font-weight: 650; }
.page-head h2 { margin: .15rem 0 .25rem; }

.passage {
  background: var(--surface); border: 1px solid var(--border); border-left: 3px solid var(--accent);
  border-radius: var(--radius); padding: 1.25rem 1.4rem; margin-bottom: 1.5rem;
}
.passage h3 { margin-bottom: .6rem; }
.passage p { margin-bottom: .8rem; }
.passage p:last-child { margin-bottom: 0; }

.audio-box {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.25rem; margin-bottom: 1.5rem;
  box-shadow: var(--shadow);
}
.audio-controls { display: flex; align-items: center; gap: .75rem; flex-wrap: wrap; }
.audio-note { font-size: .82rem; color: var(--text-muted); margin: .75rem 0 0; }
.audio-warning {
  background: var(--warn-soft); border: 1px solid var(--warn); color: var(--warn);
  border-radius: var(--radius-sm); padding: .7rem .9rem; font-size: .85rem; margin-top: .8rem;
}
.transcript { margin-top: .9rem; font-size: .9rem; }
.transcript summary { cursor: pointer; color: var(--text-muted); font-size: .85rem; }
.transcript .line { margin: .35rem 0; }
.transcript .speaker { font-weight: 650; }
.speaking-now { color: var(--accent); font-weight: 650; font-size: .85rem; }

.q {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.1rem 1.25rem; margin-bottom: .85rem;
  scroll-margin-top: 90px;
}
.q-head { display: flex; align-items: flex-start; gap: .75rem; margin-bottom: .8rem; }
.q-num {
  flex: none; width: 26px; height: 26px; display: grid; place-items: center;
  background: var(--surface-2); border-radius: 6px;
  font: 650 .75rem/1 var(--mono); color: var(--text-muted);
}
.q-prompt { flex: 1; margin: 0; font-weight: 500; }
.q-flag { flex: none; background: none; border: 0; cursor: pointer; font-size: 1rem; opacity: .3; padding: 0 .2rem; }
.q-flag:hover, .q-flag.is-on { opacity: 1; }

.opts { display: flex; flex-direction: column; gap: .4rem; }
.opt {
  display: flex; align-items: flex-start; gap: .65rem;
  padding: .6rem .8rem; border: 1px solid var(--border); border-radius: var(--radius-sm);
  cursor: pointer; transition: background .1s, border-color .1s;
}
.opt:hover { background: var(--surface-2); }
.opt input { margin: .28rem 0 0; accent-color: var(--accent); flex: none; }
.opt.is-selected { border-color: var(--accent); background: var(--accent-soft); }
.opt-letter { font: 650 .8rem/1.6 var(--mono); color: var(--text-muted); flex: none; }
.opt.is-selected .opt-letter { color: var(--accent); }

.pager { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-top: 1.5rem; }

/* ---------------- free response ---------------- */

.free-box { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.25rem; }
.free-box textarea {
  width: 100%; min-height: 220px; resize: vertical;
  font: 15px/1.6 inherit; color: var(--text);
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: .8rem;
}
.free-box textarea:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
.wordcount { font: .82rem/1 var(--mono); color: var(--text-muted); margin-top: .5rem; }
.wordcount.is-ok { color: var(--good); }
.rubric { margin-top: 1.25rem; }
.rubric ul { margin: .4rem 0 0; padding-left: 1.2rem; font-size: .9rem; color: var(--text-muted); }
.rubric li { margin: .25rem 0; }
.prompt-card { background: var(--surface-2); border-radius: var(--radius-sm); padding: 1rem 1.15rem; margin-bottom: 1rem; }
.prompt-card .prompt-q { font-weight: 600; margin: 0 0 .35rem; }
.prompt-card ul { margin: 0; padding-left: 1.2rem; font-size: .88rem; color: var(--text-muted); }

/* ---------------- results ---------------- */

.score-hero {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 2rem; margin-bottom: 1.5rem; box-shadow: var(--shadow); text-align: center;
}
.score-band { font-size: 3.5rem; font-weight: 700; line-height: 1; letter-spacing: -.03em; }
.score-band.is-pass { color: var(--good); }
.score-band.is-fail { color: var(--bad); }
.score-verdict { font-size: 1.05rem; margin-top: .5rem; }
.score-numbers { display: flex; justify-content: center; gap: 2.5rem; flex-wrap: wrap; margin-top: 1.5rem; }
.score-num { text-align: center; }
.score-num .n { font: 700 1.75rem/1 var(--mono); font-variant-numeric: tabular-nums; }
.score-num .l { font-size: .75rem; text-transform: uppercase; letter-spacing: .06em; color: var(--text-muted); margin-top: .3rem; }

.panel {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.5rem; margin-bottom: 1.5rem;
}
.panel > h2 { margin-bottom: 1rem; }

.bars { display: flex; flex-direction: column; gap: .8rem; }
.bar-row { display: grid; grid-template-columns: 150px 1fr 62px; gap: .8rem; align-items: center; font-size: .9rem; }
@media (max-width: 560px) { .bar-row { grid-template-columns: 100px 1fr 56px; font-size: .82rem; } }
/* Both are spans, so they must be blockified for width/height to apply. */
.bar-track { display: block; height: 10px; background: var(--surface-2); border-radius: 999px; overflow: hidden; }
.bar-fill { display: block; height: 100%; border-radius: 999px; background: var(--accent); }
.bar-fill.lo { background: var(--bad); }
.bar-fill.mid { background: var(--warn); }
.bar-val { font: .85rem/1 var(--mono); color: var(--text-muted); text-align: right; font-variant-numeric: tabular-nums; }

.review-q { border: 1px solid var(--border); border-radius: var(--radius); padding: 1.1rem 1.25rem; margin-bottom: .8rem; }
.review-q.is-wrong { border-left: 3px solid var(--bad); background: var(--bad-soft); }
.review-q.is-right { border-left: 3px solid var(--good); }
.review-q .rq-head { display: flex; gap: .7rem; align-items: baseline; margin-bottom: .6rem; }
.review-q .rq-num { font: 650 .75rem/1.6 var(--mono); color: var(--text-muted); flex: none; }
.review-q .rq-prompt { font-weight: 500; margin: 0; }
.review-line { font-size: .9rem; margin: .25rem 0; display: flex; gap: .5rem; }
.review-line .lbl { color: var(--text-muted); flex: none; min-width: 8.5em; }
.review-line .yours { color: var(--bad); font-weight: 600; }
.review-line .theirs { color: var(--good); font-weight: 600; }
.explain {
  margin-top: .8rem; padding: .8rem .95rem; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius-sm); font-size: .9rem;
}
.explain strong { color: var(--accent); }
details.correct-group { margin-top: 1rem; }
details.correct-group summary { cursor: pointer; color: var(--text-muted); font-size: .9rem; padding: .5rem 0; }

.results-actions { display: flex; gap: .75rem; flex-wrap: wrap; margin-top: 1.5rem; }
.tag-cefr { font: 650 .68rem/1 var(--mono); padding: .25rem .4rem; border-radius: 4px; background: var(--surface-2); color: var(--text-muted); border: 1px solid var(--border); }

/* ---------------- modal ---------------- */

.modal { position: fixed; inset: 0; z-index: 100; display: grid; place-items: center; background: rgba(0,0,0,.45); padding: 1.25rem; }
.modal-card { background: var(--surface); border-radius: var(--radius); padding: 1.75rem; max-width: 440px; width: 100%; box-shadow: 0 20px 60px rgba(0,0,0,.3); }
.modal-actions { display: flex; gap: .6rem; justify-content: flex-end; margin-top: 1.5rem; }

@media print {
  .topbar, .sidebar, .pager, .results-actions, .modal { display: none !important; }
  body { background: #fff; }
  .panel, .review-q, .score-hero { break-inside: avoid; }
}