/* Study plan, placement check and test overview (plan/*.js). Ported from the TOEFL app and
   mapped onto the DET palette (--teal, --navy, --border…). Buttons use a darker teal than
   --teal-d so white text clears 4.5:1 (white on #0d7d77 ≈ 5.0:1; on #0f8a83 ≈ 4.2:1). */
#planScreen, #homePlan {
  --accent: #0d7d77; --accent-hover: #0a6a65; --accent-ink: #0a5f5a; --accent-lt: var(--teal-l, #e6f8f7); --accent-mid: var(--teal-2, #b2e8e6);
  --surface: var(--card, #fff); --surface2: #eef3f2; --text2: #4a5868; --text3: #6b7a8d; --gold: #b86e00;
}
#planScreen { padding: 16px 16px 64px; }
.plan-shell { max-width: 760px; margin: 0 auto; }
.plan-back { appearance: none; background: var(--surface); border: 1.5px solid var(--border); color: var(--text2); min-height: 44px; padding: 0 18px; border-radius: 50px; cursor: pointer; font: inherit; font-size: 14px; font-weight: 600; margin-bottom: 16px; }
.plan-back:hover { background: var(--surface2); }
.plan-wrap { color: var(--text); }
.plan-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); }
.plan-h2 { font-size: 24px; font-weight: 800; letter-spacing: -0.4px; color: var(--navy); margin: 0 0 8px; line-height: 1.25; text-wrap: balance; }
.plan-big { color: var(--accent); white-space: nowrap; }
.plan-lead { color: var(--text2); font-size: 15px; line-height: 1.55; margin: 0 0 20px; }
.plan-note { color: var(--text2); font-size: 13px; line-height: 1.5; background: var(--surface2); border-radius: var(--radius-sm); padding: 12px 14px; margin: 16px 0; }
.plan-note a { color: var(--accent); font-weight: 700; }
.plan-weak { font-size: 15px; line-height: 1.5; margin: 18px 0 6px; color: var(--text); }
.plan-detail { font-size: 13px; color: var(--text3); margin: 0 0 8px; font-variant-numeric: tabular-nums; }
.plan-loading { color: var(--text3); padding: 32px 0; text-align: center; }

/* Buttons */
.plan-btn { appearance: none; border: 0; border-radius: var(--radius-sm); background: var(--accent); color: #fff; font: inherit; font-weight: 700; font-size: 15px; padding: 12px 22px; min-height: 48px; cursor: pointer; transition: background .15s ease, transform .12s ease; }
.plan-btn:hover { background: var(--accent-hover); }
.plan-btn:active { transform: scale(0.97); }
.plan-btn[disabled] { background: #9aa6b2; cursor: default; transform: none; }
.plan-btn.ghost { background: var(--surface); color: var(--navy); border: 1.5px solid var(--border); }
.plan-btn.ghost:hover { background: var(--surface2); }
.plan-btn.ghost[disabled] { color: var(--text3); background: var(--surface); opacity: .6; }
.plan-btn:focus-visible, .plan-link:focus-visible, .plan-start:focus-visible, .plan-tick:focus-visible, .pc-opt:focus-visible, .plan-chip-btn:focus-visible, .home-plan:focus-visible, .plan-back:focus-visible { outline: 3px solid var(--teal); outline-offset: 2px; }
.plan-link { appearance: none; background: none; border: 0; min-height: 44px; padding: 0; color: var(--accent); font: inherit; font-size: 14px; font-weight: 700; cursor: pointer; text-decoration: underline; text-underline-offset: 3px; text-align: left; }
.plan-row { display: flex; gap: 12px; margin-top: 20px; }
.plan-row .plan-btn { flex: 1; }

/* Setup form */
.plan-form { display: flex; flex-direction: column; gap: 18px; }
.plan-field { display: flex; flex-direction: column; gap: 8px; }
.plan-field > span { font-size: 13px; font-weight: 700; color: var(--text2); }
.plan-field input, .plan-field select, .pc-type { font: inherit; font-size: 16px; padding: 10px 14px; border: 1.5px solid var(--border); border-radius: var(--radius-sm); background: #fff; color: var(--text); min-height: 48px; width: 100%; box-sizing: border-box; }
.plan-field input:focus, .plan-field select:focus, .pc-type:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-lt); }
.plan-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.plan-chip { position: relative; }
.plan-chip input { position: absolute; opacity: 0; pointer-events: none; }
.plan-chip span { display: flex; flex-direction: column; justify-content: center; min-height: 48px; min-width: 48px; box-sizing: border-box; text-align: center; padding: 6px 14px; border: 1.5px solid var(--border); border-radius: var(--radius-sm); background: #fff; font-weight: 700; font-size: 14px; cursor: pointer; transition: border-color .15s ease, background .15s ease; }
.plan-chip span small { font-weight: 500; font-size: 11px; color: var(--text3); }
.plan-chip input:checked + span { border-color: var(--accent); background: var(--accent-lt); color: var(--accent-ink); }
.plan-chip input:focus-visible + span { outline: 3px solid var(--teal); outline-offset: 2px; }
.plan-chip.dis span { opacity: .45; cursor: not-allowed; }
.plan-err { color: var(--red); font-size: 13px; font-weight: 600; margin: 0; }
.plan-grid4 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }

/* Placement check */
.pc-steps { display: flex; gap: 3px; margin-bottom: 8px; }
.pc-steps i { flex: 1; height: 5px; border-radius: 99px; background: var(--border); }
.pc-steps i.on { background: var(--accent); }
.pc-count { font-size: 13px; color: var(--text3); margin: 0 0 14px; font-variant-numeric: tabular-nums; }
.pc-h { font-size: 19px; font-weight: 800; color: var(--navy); margin: 0 0 6px; line-height: 1.35; }
.pc-play { width: 100%; margin: 0 0 16px; }
.pc-type { resize: vertical; line-height: 1.5; }
.pc-passage { background: var(--surface2); border-radius: var(--radius-sm); padding: 14px 16px; margin: 0 0 14px; line-height: 1.6; font-size: 15px; }
.pc-q { font-size: 17px; margin: 4px 0 14px; }
.pc-opts { display: flex; flex-direction: column; gap: 10px; }
.pc-opt { appearance: none; text-align: left; font: inherit; font-size: 15px; line-height: 1.4; padding: 12px 16px; min-height: 48px; border: 1.5px solid var(--border); border-radius: var(--radius-sm); background: #fff; color: var(--text); cursor: pointer; transition: border-color .15s ease, background .15s ease, transform .12s ease; }
.pc-opt:hover { border-color: var(--accent-mid); }
.pc-opt:active { transform: scale(0.98); }
.pc-opt.sel { border-color: var(--accent); background: var(--accent-lt); }

/* Subscore bars (10–160, line = target) */
.plan-bands { display: flex; flex-direction: column; gap: 12px; margin: 8px 0 4px; }
.plan-band { display: grid; grid-template-columns: 112px 36px 1fr; align-items: center; gap: 10px; font-size: 14px; }
.plan-band span { color: var(--text2); font-weight: 600; }
.plan-band b { font-variant-numeric: tabular-nums; text-align: right; }
.plan-band i { position: relative; height: 8px; border-radius: 99px; background: var(--surface2); }
.plan-band i::before { content: ''; position: absolute; inset: 0 auto 0 0; width: var(--w); border-radius: 99px; background: var(--teal); }
.plan-band.gap i::before { background: var(--amber); }
.plan-band i::after { content: ''; position: absolute; top: -4px; bottom: -4px; left: var(--t); width: 2px; background: var(--navy); border-radius: 1px; }
.plan-bands.compact { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 16px; margin: 0 0 16px; }

/* Plan view */
.plan-top { display: flex; flex-direction: column; gap: 14px; margin-bottom: 16px; }
.plan-date { margin: 0 0 4px; font-size: 14px; color: var(--text2); }
.plan-kpis { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.plan-kpis div { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 10px 12px; }
.plan-kpis b { display: block; font-size: 20px; font-weight: 800; font-variant-numeric: tabular-nums; color: var(--navy); }
.plan-kpis span { font-size: 12px; color: var(--text2); }

.plan-day { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 16px; margin-bottom: 12px; }
.plan-day.today { border: 2px solid var(--teal); box-shadow: var(--shadow); }
.plan-rest { margin: 6px 0 0; }
.plan-day-h { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 4px; }
.plan-day-h b { font-size: 15px; color: var(--navy); }
.plan-day.today .plan-day-h b { font-size: 18px; }
.plan-day-h span { font-size: 12px; color: var(--text3); font-variant-numeric: tabular-nums; }
.plan-day ul { list-style: none; margin: 0; padding: 0; }
.plan-s { display: flex; align-items: center; gap: 12px; padding: 8px 0; border-top: 1px solid var(--border); min-height: 48px; }
.plan-s:first-child { border-top: 0; }
.plan-s-txt { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 2px; }
.plan-s-txt b { font-size: 14px; font-weight: 700; overflow-wrap: anywhere; }
.plan-s-txt span { font-size: 12px; color: var(--text2); }
.plan-s.done .plan-s-txt b { color: var(--text3); text-decoration: line-through; }
.plan-tick { appearance: none; flex: none; width: 26px; height: 26px; margin: 9px; border-radius: 50%; border: 2px solid #b9c6c4; background: #fff; cursor: pointer; position: relative; transition: background .15s ease, border-color .15s ease; }
.plan-tick::after { content: ''; position: absolute; inset: -11px; } /* 44px tap target */
.plan-s.done .plan-tick { background: var(--accent); border-color: var(--accent); }
.plan-s.done .plan-tick::before { content: ''; position: absolute; left: 7px; top: 3px; width: 6px; height: 11px; border: solid #fff; border-width: 0 2.5px 2.5px 0; transform: rotate(45deg); }
.plan-start { appearance: none; flex: none; display: inline-flex; align-items: center; justify-content: center; border: 0; border-radius: 50px; background: var(--accent-lt); color: var(--accent-ink); font: inherit; font-size: 14px; font-weight: 700; padding: 0 18px; min-height: 44px; min-width: 76px; box-sizing: border-box; cursor: pointer; text-decoration: none; transition: background .15s ease, transform .12s ease; }
.plan-start:hover { background: var(--accent-mid); }
.plan-start:active { transform: scale(0.97); }
.plan-start.lock { background: var(--amber-l); color: #8a5200; }
.plan-s[data-type="full"] .plan-s-txt b { color: var(--purple); }

.plan-pace { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin: 4px 0 16px; font-size: 13px; color: var(--text2); font-weight: 700; }
.plan-chip-btn { appearance: none; font: inherit; font-size: 13px; font-weight: 700; padding: 0 16px; min-height: 44px; border-radius: 50px; border: 1.5px solid var(--border); background: #fff; color: var(--text2); cursor: pointer; }
.plan-chip-btn.on { border-color: var(--accent); background: var(--accent-lt); color: var(--accent-ink); }
.plan-chip-btn[disabled] { opacity: .45; cursor: not-allowed; }

.plan-week { margin-bottom: 8px; }
.plan-week summary { display: flex; align-items: center; min-height: 44px; cursor: pointer; font-weight: 700; font-size: 15px; color: var(--navy); padding: 4px; list-style: none; }
.plan-week summary::-webkit-details-marker { display: none; }
.plan-week summary::before { content: ''; width: 7px; height: 7px; border: solid var(--text3); border-width: 0 2px 2px 0; transform: rotate(-45deg); margin-right: 12px; transition: transform .15s ease; }
.plan-week[open] summary::before { transform: rotate(45deg); }
.plan-week summary span { margin-left: auto; font-size: 12px; font-weight: 500; color: var(--text3); }
.plan-actions { display: flex; flex-direction: column; align-items: flex-start; margin-top: 8px; }

/* Home banner */
.home-plan-wrap { max-width: 860px; margin: 0 auto 16px; padding: 0 20px; }
.home-plan { appearance: none; display: flex; align-items: center; justify-content: space-between; gap: 12px; width: 100%; padding: 16px 20px; min-height: 64px; border: 1.5px solid var(--teal-2); border-radius: var(--radius); background: var(--teal-l); color: var(--navy); font: inherit; text-align: left; cursor: pointer; transition: background .15s ease, transform .12s ease; }
.home-plan:hover { background: #d8f3f1; }
.home-plan:active { transform: scale(0.99); }
.home-plan-txt { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.home-plan-txt b { font-size: 1rem; font-weight: 800; }
.home-plan-txt span { font-size: 0.84rem; color: var(--text2); }
.home-plan-go { flex: none; font-size: 0.86rem; font-weight: 700; color: var(--accent-ink); }

@media (min-width: 640px) {
  #planScreen { padding: 28px 24px 80px; }
  .plan-card { padding: 32px; }
  .plan-h2 { font-size: 28px; }
  .plan-top { flex-direction: row; justify-content: space-between; align-items: flex-end; }
  .plan-kpis { min-width: 340px; }
  .plan-grid4 { grid-template-columns: repeat(4, 1fr); }
  .plan-actions { flex-direction: row; gap: 24px; flex-wrap: wrap; }
  .pc-play { width: auto; }
}

/* Test overview (plan/overview.js) */
.ov { --r-bg: var(--teal-l); --r-ink: #0a5f5a; --l-bg: var(--coral-l); --l-ink: #a63b22; --w-bg: var(--amber-l); --w-ink: #7a4a00; --s-bg: var(--purple-l); --s-ink: #55389a; }
.ov { display: block; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); }
.ov-head .plan-lead { max-width: 62ch; }
.ov-sec { margin-top: 32px; }
.ov-h { font-size: 19px; font-weight: 800; letter-spacing: -0.2px; color: var(--navy); margin: 0 0 12px; }
.ov-h4 { font-size: 15px; font-weight: 800; color: var(--navy); margin: 24px 0 8px; }
.ov-p { color: var(--text2); line-height: 1.65; margin: 0 0 14px; max-width: 65ch; }
.ov-cap { font-size: 13px; color: var(--text2); line-height: 1.5; margin: 12px 0 0; }

/* The test to scale: one row per part, the bar's length ∝ minutes. */
.ov-scale { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 6px; }
.ov-seg { display: grid; grid-template-columns: 1fr auto; gap: 2px 12px; font-size: 14px; }
.ov-seg i { grid-column: 1 / -1; order: 3; height: 12px; width: calc(var(--m) * 4.4); max-width: 100%; border-radius: 4px; background: var(--g, var(--teal)); }
.ov-seg b { font-weight: 700; color: var(--navy); }
.ov-seg span { font-variant-numeric: tabular-nums; color: var(--text2); font-weight: 600; }
.ov-r { --g: var(--teal); } .ov-l { --g: var(--coral); } .ov-w { --g: var(--amber); } .ov-s { --g: var(--purple); }
.ov-rl { --g: linear-gradient(90deg, var(--teal) 50%, var(--coral) 50%); }
.ov-ws { --g: linear-gradient(90deg, var(--amber) 50%, var(--purple) 50%); }
@keyframes ov-grow { from { transform: scaleX(0); } to { transform: scaleX(1); } }
.ov-seg i { transform-origin: left; animation: ov-grow 600ms cubic-bezier(0.23, 1, 0.32, 1) both; }

.ov-parts { display: grid; gap: 12px; }
.ov-part { border-radius: var(--radius); padding: 16px; }
.ov-part.ov-r { background: var(--r-bg); --ink: var(--r-ink); }
.ov-part.ov-l { background: var(--l-bg); --ink: var(--l-ink); }
.ov-part.ov-w { background: var(--w-bg); --ink: var(--w-ink); }
.ov-part.ov-s { background: var(--s-bg); --ink: var(--s-ink); }
.ov-part-h { font-size: 17px; font-weight: 800; color: var(--ink); margin: 0 0 6px; }
.ov-part dl { margin: 0; font-size: 14px; line-height: 1.5; }
.ov-part dt { font-weight: 700; color: var(--ink); margin-top: 8px; }
.ov-part dd { margin: 0; color: var(--text); }

.ov-feeds { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin: 0 0 16px; }
.ov-feeds div { background: var(--surface2); border-radius: var(--radius-sm); padding: 10px 12px; }
.ov-feeds dt { font-weight: 800; color: var(--navy); font-size: 14px; }
.ov-feeds dd { margin: 2px 0 0; font-size: 13px; color: var(--text2); }

.ov-calc { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; }
.ov-calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.ov-step { display: flex; flex-direction: column; gap: 6px; }
.ov-step-name { font-size: 13px; font-weight: 700; color: var(--text2); }
.ov-step-ctl { display: flex; align-items: center; justify-content: space-between; border: 1.5px solid var(--border); border-radius: var(--radius-sm); padding: 2px; }
.ov-step-ctl button { appearance: none; width: 44px; height: 44px; border: 0; border-radius: 8px; background: var(--surface2); color: var(--navy); font: inherit; font-size: 20px; font-weight: 700; cursor: pointer; transition: background .15s ease, transform .12s ease; }
.ov-step-ctl button:hover { background: var(--accent-lt); }
.ov-step-ctl button:active { transform: scale(0.94); }
.ov-step-ctl button[disabled] { opacity: .35; cursor: default; transform: none; }
.ov-step-ctl output { font-size: 18px; font-weight: 800; font-variant-numeric: tabular-nums; color: var(--navy); }
.ov-result { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 20px; margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--border); }
.ov-result > div { display: flex; flex-direction: column; }
.ov-result-l { font-size: 12px; font-weight: 700; color: var(--text2); }
.ov-result b { font-size: 22px; font-weight: 800; font-variant-numeric: tabular-nums; color: var(--text2); }
.ov-result b.ov-big { font-size: 34px; color: var(--navy); line-height: 1.1; }
.ov-result.met b.ov-big { color: var(--accent); }
.ov-arrow { width: 28px; height: 2px; background: var(--border); position: relative; }
.ov-arrow::after { content: ''; position: absolute; right: -1px; top: -4px; border: 5px solid transparent; border-left-color: var(--border); border-right: 0; }
.ov-verdict { flex-basis: 100%; margin: 0; font-size: 14px; font-weight: 600; color: var(--text2); }
.ov-result.met .ov-verdict { color: var(--accent-ink); }

.ov-facts { margin: 0; padding-left: 20px; line-height: 1.65; max-width: 65ch; }
.ov-facts li { margin-bottom: 8px; }
.ov-done { margin-top: 32px; width: 100%; }

@media (min-width: 640px) {
  .ov { padding: 32px; }
  .ov-parts { grid-template-columns: 1fr 1fr; }
  .ov-feeds { grid-template-columns: repeat(4, 1fr); }
  .ov-calc-grid { grid-template-columns: repeat(4, 1fr); }
  .ov-seg { grid-template-columns: 260px 1fr 110px; align-items: center; }
  .ov-seg i { grid-column: 2; order: 0; width: calc(var(--m) * 4.4); }
  .ov-seg b { order: -1; }
  .ov-seg span { text-align: right; }
  .ov-done { width: auto; }
}

@media (prefers-reduced-motion: reduce) {
  .plan-btn, .plan-start, .pc-opt, .plan-tick, .plan-week summary::before, .home-plan, .ov-step-ctl button, .plan-chip span { transition: none; }
  .ov-seg i { animation: none; }
  .plan-btn:active, .plan-start:active, .pc-opt:active, .home-plan:active, .ov-step-ctl button:active { transform: none; }
}