/* ═══════════════════════════════════════════════════════
   Harvard English Academy — English Proficiency Test v1.0
   Duolingo-Inspired · Liquid Glass · Adaptive
═══════════════════════════════════════════════════════ */

:root {
  --ht-a: #a51c30;
  --ht-a2: #c4253a;
  --ht-rgb: 165,28,48;
  --ht-rgb2: 196,37,58;
  --ht-ok: #16a34a;
  --ht-err: #dc2626;
  --ht-text: #0f172a;
  --ht-text2: #334155;
  --ht-sub: #64748b;
  --ht-muted: #94a3b8;
  --ht-bg: #f8fafc;
  --ht-glass: rgba(255,255,255,.68);
  --ht-glass2: rgba(255,255,255,.82);
  --ht-border: rgba(255,255,255,.85);
  --ht-blur: blur(28px) saturate(200%);
  --ht-fh: 'Bricolage Grotesque', sans-serif;
  --ht-fb: 'Plus Jakarta Sans', sans-serif;
  --ht-fm: 'JetBrains Mono', monospace;
  --ht-spring: cubic-bezier(.34,1.56,.64,1);
  --ht-out: cubic-bezier(.16,1,.3,1);
}

/* Reset scoped */
#heat-app *, #heat-app *::before, #heat-app *::after {
  box-sizing: border-box!important;
  margin: 0; padding: 0;
}

#heat-app {
  font-family: var(--ht-fb);
  color: var(--ht-text);
  max-width: 820px;
  margin: 0 auto;
  padding: 20px 16px 60px;
  -webkit-font-smoothing: antialiased;
}

/* ══════════════════════════════════
   WELCOME / START SCREEN
══════════════════════════════════ */
.ht-welcome {
  text-align: center;
  padding: 32px 20px;
  animation: ht-fadeUp .6s var(--ht-out) both;
  display: flex; flex-direction: column; align-items: center;
}
.ht-logo {
  width: 64px; height: 64px; border-radius: 18px;
  background: linear-gradient(135deg, var(--ht-a), var(--ht-a2));
  display: flex; align-items: center; justify-content: center;
  margin: 0 0 20px;
  box-shadow: 0 12px 40px rgba(var(--ht-rgb),.3), inset 0 2px 0 rgba(255,255,255,.25);
  font-size: 28px; color: #fff;
}
.ht-welcome h1 {
  font-family: var(--ht-fh)!important;
  font-size: clamp(24px, 5vw, 36px)!important;
  font-weight: 800!important;
  letter-spacing: -.03em!important;
  line-height: 1.15!important;
  color: var(--ht-text)!important;
  margin: 0 0 8px!important;
}
.ht-welcome .ht-tagline {
  font-size: 14px; color: var(--ht-sub);
  margin: 0 0 24px; line-height: 1.5;
}
.ht-features {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 10px; margin: 0 auto 24px; max-width: 400px;
}
.ht-feat {
  background: var(--ht-glass2); backdrop-filter: var(--ht-blur);
  -webkit-backdrop-filter: var(--ht-blur);
  border: 1.5px solid var(--ht-border); border-radius: 14px;
  padding: 12px 10px; text-align: center;
  box-shadow: 0 4px 16px rgba(0,0,0,.06), inset 0 1px 0 rgba(255,255,255,.9);
  transition: transform .2s var(--ht-spring);
}
.ht-feat:hover { transform: translateY(-3px); }
.ht-feat-ico { font-size: 22px; margin-bottom: 4px; }
.ht-feat-lbl { font-size: 11px; font-weight: 700; color: var(--ht-text2); }
.ht-feat-val { font-size: 10px; color: var(--ht-sub); margin-top: 2px; }

/* Info form */
.ht-info-form {
  max-width: 440px; margin: 0 0 20px; text-align: left; width: 100%;
}
.ht-info-field {
  margin-bottom: 10px;
}
.ht-info-field label {
  display: block!important; font-size: 11px!important; font-weight: 700!important;
  letter-spacing: .07em!important; text-transform: uppercase!important;
  color: var(--ht-muted)!important; margin: 0 0 5px!important;
}
.ht-info-field input {
  width: 100%!important; padding: 10px 14px!important;
  background: var(--ht-glass)!important; backdrop-filter: blur(14px)!important;
  border: 1.5px solid rgba(200,200,220,.5)!important; border-radius: 12px!important;
  font-family: var(--ht-fb)!important; font-size: 14px!important;
  color: var(--ht-text)!important; outline: none!important;
  transition: border-color .2s, box-shadow .2s!important;
  height: auto!important; min-height: 40px!important;
  -webkit-appearance: none!important;
}
.ht-info-field input:focus {
  border-color: rgba(var(--ht-rgb),.5)!important;
  box-shadow: 0 0 0 4px rgba(var(--ht-rgb),.1)!important;
}
.ht-info-field input::placeholder { color: var(--ht-muted)!important; }

/* Start button */
.ht-start-btn {
  display: inline-flex!important; align-items: center!important; gap: 8px!important;
  padding: 14px 36px!important; border: none!important; border-radius: 16px!important;
  background: linear-gradient(135deg, #c4253a, var(--ht-a), #7a1525)!important;
  color: #fff!important; font-family: var(--ht-fh)!important; font-size: 16px!important;
  font-weight: 700!important; cursor: pointer!important;
  box-shadow: 0 8px 32px rgba(var(--ht-rgb),.4), inset 0 1px 0 rgba(255,255,255,.2)!important;
  transition: transform .2s var(--ht-spring), box-shadow .25s!important;
  position: relative!important; overflow: hidden!important;
}
.ht-start-btn::after {
  content: ''; position: absolute; top: -50%; left: -100%; width: 50%; height: 200%;
  background: linear-gradient(105deg,transparent,rgba(255,255,255,.3),transparent);
  transform: skewX(-15deg); animation: ht-shimmer 3s ease-in-out infinite;
}
@keyframes ht-shimmer { 0%{left:-100%} 55%{left:160%} 100%{left:160%} }
.ht-start-btn:hover { transform: translateY(-3px)!important; box-shadow: 0 14px 44px rgba(var(--ht-rgb),.5), inset 0 1px 0 rgba(255,255,255,.2)!important; }
.ht-start-btn:active { transform: scale(.96)!important; }
.ht-start-btn:disabled { opacity:.5!important; cursor:not-allowed!important; }

/* ══════════════════════════════════
   TEST AREA
══════════════════════════════════ */
.ht-test { animation: ht-fadeUp .5s var(--ht-out) both; }

/* Header bar */
.ht-header {
  display: flex; align-items: center; gap: 12px; padding: 10px 0;
  margin-bottom: 12px; flex-wrap: wrap;
}
.ht-progress-wrap { flex: 1; min-width: 120px; }
.ht-progress-bar {
  height: 8px; background: rgba(var(--ht-rgb),.12); border-radius: 99px;
  overflow: hidden; position: relative;
}
.ht-progress-fill {
  height: 100%; border-radius: 99px;
  background: linear-gradient(90deg, var(--ht-a2), var(--ht-a));
  transition: width .4s var(--ht-out);
  position: relative;
}
.ht-progress-fill::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(90deg,transparent,rgba(255,255,255,.5),transparent);
  animation: ht-shine 2s ease-in-out infinite;
}
@keyframes ht-shine { from{transform:translateX(-100%)} to{transform:translateX(300%)} }
.ht-progress-text {
  display: flex; justify-content: space-between; margin-top: 4px;
  font-size: 11px; font-weight: 600; color: var(--ht-muted);
}

/* Timer */
.ht-timer {
  display: flex; align-items: center; gap: 7px;
  background: var(--ht-glass2); backdrop-filter: blur(12px);
  border: 1.5px solid var(--ht-border); border-radius: 14px;
  padding: 8px 16px;
  font-family: var(--ht-fm); font-size: 18px; font-weight: 700;
  color: var(--ht-text); white-space: nowrap;
  box-shadow: 0 4px 16px rgba(0,0,0,.06), inset 0 1px 0 rgba(255,255,255,.9);
}
.ht-timer.ht-warning { color: #c4253a; animation: ht-pulse-warn 1s ease-in-out infinite; }
.ht-timer.ht-danger { color: var(--ht-err); animation: ht-pulse-warn .5s ease-in-out infinite; }
@keyframes ht-pulse-warn { 0%,100%{opacity:1} 50%{opacity:.6} }
.ht-timer-ico { font-size: 16px; }

/* Question card */
.ht-qcard {
  background: var(--ht-glass2); backdrop-filter: var(--ht-blur);
  -webkit-backdrop-filter: var(--ht-blur);
  border: 1.5px solid var(--ht-border); border-radius: 22px;
  padding: 22px 20px; margin-bottom: 16px;
  box-shadow: 0 8px 40px rgba(0,0,0,.08), inset 0 1px 0 rgba(255,255,255,.9);
  animation: ht-cardIn .4s var(--ht-out) both;
  position: relative; overflow: hidden;
}
.ht-qcard::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--ht-a), var(--ht-a2), var(--ht-a));
  background-size: 200% 100%;
  animation: ht-flow 4s linear infinite;
}
@keyframes ht-flow { from{background-position:200% 0} to{background-position:-200% 0} }
@keyframes ht-cardIn { from{opacity:0;transform:translateX(30px)} to{opacity:1;transform:translateX(0)} }

.ht-q-meta {
  display: flex; align-items: center; gap: 6px; margin-bottom: 12px; flex-wrap: wrap;
}
.ht-q-badge {
  padding: 4px 12px; border-radius: 99px; font-size: 11px; font-weight: 700;
  text-transform: uppercase; letter-spacing: .05em;
}
.ht-q-badge-type { background: rgba(var(--ht-rgb),.12); color: var(--ht-a); }
.ht-q-badge-diff-easy { background: #d1fae5; color: #065f46; }
.ht-q-badge-diff-medium { background: #fef3c7; color: #92400e; }
.ht-q-badge-diff-hard { background: #fee2e2; color: #991b1b; }
.ht-q-num { font-size: 12px; font-weight: 600; color: var(--ht-muted); margin-left: auto; }
.ht-q-points { font-size: 11px; font-weight: 700; color: var(--ht-a); background: rgba(var(--ht-rgb),.08); padding: 3px 10px; border-radius: 20px; }

.ht-q-text {
  font-family: var(--ht-fh)!important;
  font-size: 18px!important; font-weight: 700!important;
  line-height: 1.45!important; color: var(--ht-text)!important;
  margin: 0 0 16px!important; white-space: pre-line!important;
}

/* MCQ Options */
.ht-options { display: flex; flex-direction: column; gap: 10px; }

.ht-opt {
  display: flex!important; align-items: center!important; gap: 14px!important;
  padding: 14px 18px!important; border-radius: 16px!important;
  background: rgba(255,255,255,.55)!important; backdrop-filter: blur(10px)!important;
  border: 1.5px solid rgba(200,200,220,.4)!important;
  box-shadow: 0 2px 10px rgba(0,0,0,.04), inset 0 1px 0 rgba(255,255,255,.9)!important;
  cursor: pointer!important; transition: all .2s!important;
  font-family: var(--ht-fb)!important; font-size: 14px!important; font-weight: 500!important;
  color: var(--ht-text2)!important; text-align: left!important;
  -webkit-tap-highlight-color: transparent!important;
}
.ht-opt:hover {
  border-color: rgba(var(--ht-rgb),.4)!important;
  background: rgba(255,255,255,.78)!important;
  transform: translateY(-2px)!important;
  box-shadow: 0 8px 24px rgba(var(--ht-rgb),.12), inset 0 1px 0 #fff!important;
}
.ht-opt.ht-selected {
  border-color: rgba(var(--ht-rgb),.6)!important;
  background: rgba(165,28,48,.1)!important;
  box-shadow: 0 6px 20px rgba(var(--ht-rgb),.2), inset 0 1px 0 rgba(255,255,255,.9)!important;
  color: var(--ht-a)!important; font-weight: 600!important;
}
.ht-opt-marker {
  width: 28px; height: 28px; border-radius: 50%; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  background: rgba(var(--ht-rgb),.08); border: 2px solid rgba(var(--ht-rgb),.2);
  font-family: var(--ht-fm); font-size: 12px; font-weight: 700; color: var(--ht-sub);
  transition: all .2s;
}
.ht-selected .ht-opt-marker {
  background: var(--ht-a); border-color: var(--ht-a); color: #fff;
  box-shadow: 0 0 12px rgba(var(--ht-rgb),.4);
}

/* Text input for type-in answers */
.ht-type-input {
  width: 100%!important; padding: 14px 18px!important;
  background: rgba(255,255,255,.55)!important; backdrop-filter: blur(14px)!important;
  border: 1.5px solid rgba(200,200,220,.5)!important; border-radius: 16px!important;
  font-family: var(--ht-fb)!important; font-size: 16px!important;
  color: var(--ht-text)!important; outline: none!important;
  transition: border-color .2s, box-shadow .2s!important;
  height: auto!important; min-height: 48px!important;
  -webkit-appearance: none!important;
}
.ht-type-input:focus {
  border-color: rgba(var(--ht-rgb),.5)!important;
  box-shadow: 0 0 0 4px rgba(var(--ht-rgb),.1)!important;
}

/* Writing textarea */
.ht-write-area {
  width: 100%!important; min-height: 120px!important; padding: 14px 18px!important;
  background: rgba(255,255,255,.55)!important; backdrop-filter: blur(14px)!important;
  border: 1.5px solid rgba(200,200,220,.5)!important; border-radius: 16px!important;
  font-family: var(--ht-fb)!important; font-size: 15px!important; line-height: 1.6!important;
  color: var(--ht-text)!important; outline: none!important; resize: vertical!important;
  transition: border-color .2s, box-shadow .2s!important;
  -webkit-appearance: none!important;
}
.ht-write-area:focus {
  border-color: rgba(var(--ht-rgb),.5)!important;
  box-shadow: 0 0 0 4px rgba(var(--ht-rgb),.1)!important;
}
.ht-write-counter {
  text-align: right; font-size: 12px; font-weight: 600;
  color: var(--ht-muted); margin-top: 6px;
}

/* Navigation */
.ht-nav {
  display: flex; gap: 10px; justify-content: space-between; align-items: center;
  margin-top: 8px;
}
.ht-nav-btn {
  display: inline-flex!important; align-items: center!important; gap: 8px!important;
  padding: 13px 24px!important; border: none!important; border-radius: 16px!important;
  font-family: var(--ht-fh)!important; font-size: 14px!important; font-weight: 700!important;
  cursor: pointer!important; transition: all .2s var(--ht-spring)!important;
}
.ht-nav-prev {
  background: rgba(255,255,255,.65)!important; backdrop-filter: blur(8px)!important;
  border: 1.5px solid rgba(255,255,255,.82)!important; color: var(--ht-sub)!important;
  box-shadow: 0 2px 10px rgba(0,0,0,.06)!important;
}
.ht-nav-prev:hover { background: rgba(255,255,255,.9)!important; color: var(--ht-text)!important; }
.ht-nav-next, .ht-nav-submit {
  background: linear-gradient(135deg, #c4253a, var(--ht-a), #7a1525)!important;
  color: #fff!important;
  box-shadow: 0 6px 24px rgba(var(--ht-rgb),.35), inset 0 1px 0 rgba(255,255,255,.2)!important;
}
.ht-nav-next:hover, .ht-nav-submit:hover {
  transform: translateY(-2px)!important;
  box-shadow: 0 10px 34px rgba(var(--ht-rgb),.45), inset 0 1px 0 rgba(255,255,255,.2)!important;
}
.ht-nav-btn:disabled { opacity:.4!important; cursor:not-allowed!important; transform:none!important; }
.ht-skip-btn {
  background: transparent!important; border: none!important;
  font-family: var(--ht-fb)!important; font-size: 13px!important;
  font-weight: 600!important; color: var(--ht-muted)!important;
  cursor: pointer!important; padding: 8px 12px!important;
  transition: color .2s!important;
}
.ht-skip-btn:hover { color: var(--ht-a)!important; }

/* ══════════════════════════════════
   RESULTS SCREEN
══════════════════════════════════ */
.ht-results {
  text-align: center; padding: 30px 16px;
  animation: ht-fadeUp .6s var(--ht-out) both;
}
.ht-score-ring {
  width: 180px; height: 180px; margin: 0 auto 24px; position: relative;
}
.ht-score-ring svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.ht-score-ring circle {
  fill: none; stroke-width: 8; stroke-linecap: round;
}
.ht-score-ring .ht-ring-bg { stroke: rgba(var(--ht-rgb),.12); }
.ht-score-ring .ht-ring-fill {
  stroke: var(--ht-a);
  stroke-dasharray: 502;
  stroke-dashoffset: 502;
  transition: stroke-dashoffset 1.5s var(--ht-out);
}
.ht-score-center {
  position: absolute; inset: 0; display: flex; flex-direction: column;
  align-items: center; justify-content: center;
}
.ht-score-pct {
  font-family: var(--ht-fh); font-size: 42px; font-weight: 800;
  color: var(--ht-text); letter-spacing: -.03em; line-height: 1;
}
.ht-score-label { font-size: 12px; font-weight: 600; color: var(--ht-sub); margin-top: 2px; }

.ht-level-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 24px; border-radius: 99px;
  background: linear-gradient(135deg, rgba(var(--ht-rgb),.12), rgba(var(--ht-rgb2),.12));
  border: 1.5px solid rgba(var(--ht-rgb),.25);
  font-family: var(--ht-fh); font-size: 18px; font-weight: 800;
  color: var(--ht-a); margin-bottom: 20px;
  box-shadow: 0 4px 16px rgba(var(--ht-rgb),.15);
}
.ht-level-badge .ht-level-emoji { font-size: 22px; }

.ht-results h2 {
  font-family: var(--ht-fh)!important; font-size: 28px!important;
  font-weight: 800!important; color: var(--ht-text)!important;
  margin: 0 0 6px!important;
}
.ht-results .ht-results-sub {
  font-size: 14px; color: var(--ht-sub); margin-bottom: 28px; line-height: 1.6;
}

/* Score breakdown */
.ht-breakdown {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px; max-width: 500px; margin: 0 auto 28px;
}
.ht-break-card {
  background: var(--ht-glass2); backdrop-filter: blur(12px);
  border: 1.5px solid var(--ht-border); border-radius: 16px;
  padding: 16px 12px; text-align: center;
  box-shadow: 0 4px 16px rgba(0,0,0,.05);
}
.ht-break-val { font-family: var(--ht-fh); font-size: 28px; font-weight: 800; color: var(--ht-text); }
.ht-break-lbl { font-size: 11px; font-weight: 600; color: var(--ht-muted); margin-top: 2px; }

/* Detailed review */
.ht-review { text-align: left; margin-top: 32px; }
.ht-review h3 {
  font-family: var(--ht-fh)!important; font-size: 20px!important; font-weight: 800!important;
  color: var(--ht-text)!important; margin: 0 0 16px!important;
}
.ht-review-item {
  background: var(--ht-glass); backdrop-filter: blur(10px);
  border: 1.5px solid rgba(200,200,220,.3); border-radius: 16px;
  padding: 16px 18px; margin-bottom: 10px;
  transition: all .2s;
}
.ht-review-item.ht-review-correct { border-left: 4px solid var(--ht-ok); }
.ht-review-item.ht-review-wrong { border-left: 4px solid var(--ht-err); }
.ht-review-q { font-weight: 600; font-size: 14px; color: var(--ht-text); margin-bottom: 8px; line-height: 1.5; }
.ht-review-answers { font-size: 13px; color: var(--ht-text2); }
.ht-review-answers span { display: block; margin: 3px 0; }
.ht-review-your { color: var(--ht-err); }
.ht-review-correct-ans { color: var(--ht-ok); font-weight: 600; }
.ht-review-item.ht-review-correct .ht-review-your { color: var(--ht-ok); }
.ht-review-explanation {
  margin-top: 8px; padding: 8px 12px; border-radius: 10px;
  background: rgba(var(--ht-rgb),.06); font-size: 12px; color: var(--ht-sub);
  line-height: 1.5;
}

/* Action buttons */
.ht-actions {
  display: flex; gap: 12px; justify-content: center; flex-wrap: wrap;
  margin: 24px 0 8px;
}
.ht-action-btn {
  display: inline-flex!important; align-items: center!important; gap: 8px!important;
  padding: 12px 24px!important; border-radius: 14px!important; border: none!important;
  font-family: var(--ht-fb)!important; font-size: 14px!important; font-weight: 600!important;
  cursor: pointer!important; transition: all .2s!important;
}
.ht-action-primary {
  background: linear-gradient(135deg, #c4253a, var(--ht-a))!important;
  color: #fff!important; box-shadow: 0 4px 16px rgba(var(--ht-rgb),.3)!important;
}
.ht-action-primary:hover { transform: translateY(-2px)!important; }
.ht-action-secondary {
  background: rgba(255,255,255,.65)!important; border: 1.5px solid rgba(200,200,220,.4)!important;
  color: var(--ht-text2)!important;
}
.ht-action-secondary:hover { background: rgba(255,255,255,.9)!important; }

.ht-cta-box {
  background: linear-gradient(135deg, rgba(var(--ht-rgb),.08), rgba(var(--ht-rgb2),.08));
  border: 1.5px solid rgba(var(--ht-rgb),.2); border-radius: 20px;
  padding: 24px; margin: 24px auto 0; max-width: 500px; text-align: center;
}
.ht-cta-box h4 {
  font-family: var(--ht-fh)!important; font-size: 18px!important; font-weight: 800!important;
  color: var(--ht-text)!important; margin: 0 0 6px!important;
}
.ht-cta-box p { font-size: 13px; color: var(--ht-sub); margin: 0 0 14px; }
.ht-cta-link {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 11px 24px; border-radius: 14px; text-decoration: none;
  background: linear-gradient(135deg, var(--ht-a), var(--ht-a2)); color: #fff;
  font-family: var(--ht-fb); font-size: 14px; font-weight: 700;
  box-shadow: 0 4px 16px rgba(var(--ht-rgb),.3);
  transition: transform .2s var(--ht-spring);
}
.ht-cta-link:hover { transform: translateY(-2px); color: #fff; text-decoration: none; }

/* ══════════════════════════════════
   ANIMATIONS
══════════════════════════════════ */
@keyframes ht-fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ══════════════════════════════════
   RESPONSIVE
══════════════════════════════════ */
@media (max-width: 600px) {
  #heat-app { padding: 10px 10px 36px; }
  .ht-welcome { padding: 20px 10px; }
  .ht-welcome h1 { font-size: 24px!important; }
  .ht-features { grid-template-columns: 1fr 1fr; gap: 8px; max-width: 100%; }
  .ht-qcard { padding: 16px 14px; border-radius: 18px; }
  .ht-q-text { font-size: 15px!important; }
  .ht-opt { padding: 11px 14px!important; font-size: 13px!important; }
  .ht-opt-marker { width: 24px; height: 24px; font-size: 11px; }
  .ht-timer { font-size: 15px; padding: 6px 12px; }
  .ht-nav-btn { padding: 10px 16px!important; font-size: 13px!important; }
  .ht-score-ring { width: 150px; height: 150px; }
  .ht-score-pct { font-size: 34px; }
  .ht-level-badge { font-size: 15px; padding: 8px 18px; }
  .ht-breakdown { grid-template-columns: 1fr 1fr; }
  .ht-header { gap: 8px; }
  .ht-info-field input { font-size: 16px!important; }
  .ht-info-field { margin-bottom: 8px; }
}
@media (max-width: 380px) {
  .ht-features { grid-template-columns: 1fr; }
  .ht-nav { flex-wrap: wrap; }
}