/* ═══════════════════════════════════════════
   BASE
═══════════════════════════════════════════ */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --blue:    #0C2340;
  --blue2:   #1A73E8;
  --green:   #0D9488;
  --green-bg:#F0FDFA;
  --yellow:  #B45309;
  --yellow-bg:#FEF3C7;
  --red:     #E11D48;
  --red-bg:  #FFF1F2;
  --gray:    #64748B;
  --border:  #E2E8F0;
  --bg:      #F8FAFC;
  --white:   #ffffff;
  --radius:  16px;
  --shadow:  0 10px 30px -10px rgba(12,35,64,.08);
}

body {
  font-family: 'Be Vietnam Pro', sans-serif;
  background: var(--bg);
  color: #1F2937;
  min-height: 100vh;
}

/* ═══════════════════════════════════════════
   SCREENS
═══════════════════════════════════════════ */
.screen { display: none; }
.screen.active { display: block; }

.page-center {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  background:
    radial-gradient(circle at 15% 20%, rgba(46,117,182,.12) 0%, transparent 40%),
    radial-gradient(circle at 85% 80%, rgba(234,179,8,.08) 0%, transparent 35%),
    var(--bg);
}

/* ═══════════════════════════════════════════
   CARD
═══════════════════════════════════════════ */
.card {
  background: var(--white);
  border-radius: 20px;
  box-shadow: var(--shadow);
  padding: 40px 36px;
  width: 100%;
}
.register-card { max-width: 640px; }
.result-card   { max-width: 520px; text-align: center; }

/* ═══════════════════════════════════════════
   BRAND
═══════════════════════════════════════════ */
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 28px;
}
.logo {
  width: 52px; height: 52px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--blue), var(--blue2));
  color: white;
  display: grid; place-items: center;
  font-weight: 800; font-size: 18px; letter-spacing: 1px;
  flex-shrink: 0;
}
.logo-sm {
  width: 34px; height: 34px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--blue), var(--blue2));
  color: white;
  display: grid; place-items: center;
  font-weight: 800; font-size: 12px; letter-spacing: 1px;
  flex-shrink: 0;
}
.brand-name { font-weight: 800; color: var(--blue); font-size: 16px; }
.brand-sub  { font-size: 12px; color: var(--gray); }

h1 {
  font-size: 24px;
  color: var(--blue);
  margin-bottom: 6px;
  letter-spacing: -.3px;
}
.desc { color: var(--gray); font-size: 14px; margin-bottom: 28px; }

/* ═══════════════════════════════════════════
   FORM
═══════════════════════════════════════════ */
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
@media (max-width: 540px) { .form-row { grid-template-columns: 1fr; } }

.field { margin-bottom: 16px; }
.field label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: #374151;
  margin-bottom: 6px;
}
.req { color: var(--red); }

.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 11px 14px;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  font-size: 14px;
  font-family: inherit;
  background: white;
  transition: border-color .2s, box-shadow .2s;
  color: #1F2937;
}
.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--blue2);
  box-shadow: 0 0 0 3px rgba(46,117,182,.12);
}
.field textarea { resize: vertical; min-height: 120px; line-height: 1.6; }

.consent-box {
  background: #F9FAFB;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 14px;
  margin-bottom: 16px;
}
.consent-label {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  cursor: pointer;
  font-size: 13px;
  color: #374151;
  line-height: 1.5;
}
.consent-label input[type="checkbox"] {
  width: 16px; height: 16px;
  margin-top: 2px;
  flex-shrink: 0;
  accent-color: var(--blue2);
}

.info-box {
  display: flex;
  gap: 12px;
  background: #EFF6FF;
  border: 1px solid #BFDBFE;
  border-radius: 10px;
  padding: 14px;
  margin-bottom: 20px;
  font-size: 13px;
  color: #1E40AF;
}
.info-icon { font-size: 18px; flex-shrink: 0; margin-top: 1px; }
.info-box ul { padding-left: 16px; margin-top: 4px; }
.info-box li { margin-bottom: 3px; }

.error-msg {
  background: var(--red-bg);
  color: var(--red);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 13px;
  margin-bottom: 14px;
}

/* ═══════════════════════════════════════════
   BUTTONS
═══════════════════════════════════════════ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  border-radius: 10px;
  font-weight: 700;
  font-size: 14px;
  font-family: inherit;
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: transform .15s, box-shadow .15s, opacity .15s;
}
.btn:disabled { opacity: .5; cursor: not-allowed; transform: none !important; }
.btn-primary {
  background: linear-gradient(135deg, var(--blue), var(--blue2));
  color: white;
}
.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(31,78,121,.25);
}
.btn-ghost {
  background: white;
  color: var(--blue);
  border: 1.5px solid var(--border);
}
.btn-ghost:hover:not(:disabled) { border-color: var(--blue); background: #F9FAFB; }
.btn-full { width: 100%; }
.btn-submit {
  background: #DC2626;
  color: white;
  padding: 8px 18px;
  font-size: 13px;
  border-radius: 8px;
}
.btn-submit:hover { background: #B91C1C; }

/* ═══════════════════════════════════════════
   EXAM HEADER
═══════════════════════════════════════════ */
.exam-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: white;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 10px 24px;
  box-shadow: 0 2px 8px rgba(0,0,0,.06);
}
.exam-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  color: var(--blue);
  font-size: 14px;
  white-space: nowrap;
  min-width: 140px;
}
.exam-tabs {
  display: flex;
  gap: 4px;
  flex: 1;
  justify-content: center;
}
.tab {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 8px;
  border: 1.5px solid var(--border);
  background: white;
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  color: var(--gray);
  cursor: pointer;
  transition: .15s;
}
.tab:hover { border-color: var(--blue2); color: var(--blue); }
.tab.active {
  background: linear-gradient(135deg, var(--blue), var(--blue2));
  color: white;
  border-color: transparent;
}
.tab-prog {
  background: rgba(255,255,255,.25);
  border-radius: 20px;
  padding: 1px 7px;
  font-size: 11px;
  font-weight: 700;
}
.tab.active .tab-prog { background: rgba(255,255,255,.3); }
.tab:not(.active) .tab-prog { background: #F3F4F6; color: var(--gray); }

.timer-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 140px;
  justify-content: flex-end;
}
.timer {
  font-size: 20px;
  font-weight: 800;
  color: var(--blue);
  font-variant-numeric: tabular-nums;
  letter-spacing: 1px;
  min-width: 60px;
  text-align: right;
}
.timer.warning { color: #D97706; }
.timer.danger  { color: var(--red); animation: blink 1s infinite; }
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:.4} }

@media (max-width: 700px) {
  .exam-header { flex-wrap: wrap; padding: 8px 12px; gap: 8px; }
  .exam-brand  { min-width: auto; }
  .exam-tabs   { order: 3; width: 100%; }
  .tab         { flex: 1; justify-content: center; padding: 7px 8px; font-size: 12px; }
  .timer-wrap  { min-width: auto; }
}

/* ═══════════════════════════════════════════
   EXAM BODY
═══════════════════════════════════════════ */
.exam-body { max-width: 860px; margin: 0 auto; padding: 28px 20px 60px; }

.track { display: none; }
.track.active { display: block; }

.track-intro {
  margin-bottom: 24px;
  padding: 20px 24px;
  background: white;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
.track-intro h2 { font-size: 20px; color: var(--blue); margin-bottom: 6px; }
.track-intro p  { color: var(--gray); font-size: 14px; }

/* ═══════════════════════════════════════════
   QUESTION CARDS
═══════════════════════════════════════════ */
.q-card {
  background: white;
  border-radius: var(--radius);
  border: 1.5px solid var(--border);
  padding: 22px 24px;
  margin-bottom: 16px;
  transition: border-color .2s;
}
.q-card.answered { border-color: #86EFAC; }

.q-num {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .5px;
  color: var(--gray);
  margin-bottom: 10px;
}
.q-level {
  display: inline-block;
  background: #EFF6FF;
  color: var(--blue);
  border-radius: 20px;
  padding: 2px 8px;
  font-size: 11px;
  font-weight: 700;
  margin-left: 6px;
}

/* Audio player */
.audio-player {
  display: flex;
  align-items: center;
  gap: 12px;
  background: #F0F9FF;
  border: 1px solid #BAE6FD;
  border-radius: 10px;
  padding: 12px 16px;
  margin-bottom: 14px;
}
.audio-topic {
  font-size: 13px;
  color: #0369A1;
  font-weight: 600;
  flex: 1;
}
.audio-desc {
  font-size: 12px;
  color: #0369A1;
  opacity: .8;
}
.btn-play {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--blue2);
  color: white;
  border: none;
  border-radius: 8px;
  font-family: inherit;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: .15s;
  white-space: nowrap;
}
.btn-play:hover:not(:disabled) { background: var(--blue); }
.btn-play:disabled { opacity: .5; cursor: not-allowed; }
.listen-count {
  font-size: 12px;
  color: var(--gray);
  white-space: nowrap;
}
.listen-count.exhausted { color: var(--red); font-weight: 600; }

/* Passage */
.passage {
  background: #FAFAFA;
  border-left: 3px solid var(--blue2);
  border-radius: 0 8px 8px 0;
  padding: 14px 16px;
  margin-bottom: 14px;
  font-size: 14px;
  line-height: 1.7;
  color: #374151;
}

/* Question text */
.q-text {
  font-size: 15px;
  font-weight: 600;
  color: #111827;
  margin-bottom: 14px;
  line-height: 1.5;
}

/* Options */
.options { display: flex; flex-direction: column; gap: 8px; }
.option {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border: 1.5px solid var(--border);
  border-radius: 9px;
  cursor: pointer;
  transition: .15s;
  font-size: 14px;
  color: #374151;
  user-select: none;
}
.option:hover { border-color: var(--blue2); background: #EFF6FF; }
.option.selected {
  border-color: var(--blue2);
  background: #EFF6FF;
  color: var(--blue);
  font-weight: 600;
}
.option input[type="radio"] { accent-color: var(--blue2); width: 16px; height: 16px; flex-shrink: 0; }
.option-letter {
  width: 24px; height: 24px;
  border-radius: 50%;
  background: #F3F4F6;
  display: grid; place-items: center;
  font-size: 12px;
  font-weight: 700;
  color: var(--gray);
  flex-shrink: 0;
}
.option.selected .option-letter { background: var(--blue2); color: white; }

/* Writing prompt */
.writing-prompt {
  background: #FFFBEB;
  border: 1px solid #FDE68A;
  border-radius: 10px;
  padding: 14px 16px;
  margin-bottom: 14px;
  font-size: 14px;
  color: #92400E;
  line-height: 1.6;
}
.writing-meta {
  display: flex;
  gap: 12px;
  margin-bottom: 10px;
  font-size: 12px;
  color: var(--gray);
}
.writing-meta span {
  background: #F3F4F6;
  border-radius: 20px;
  padding: 2px 8px;
}
.word-count {
  font-size: 12px;
  color: var(--gray);
  text-align: right;
  margin-top: 6px;
}
.word-count.ok { color: var(--green); font-weight: 600; }

/* ═══════════════════════════════════════════
   MODAL
═══════════════════════════════════════════ */
.modal { display: none; position: fixed; inset: 0; z-index: 999; }
.modal.show { display: flex; align-items: center; justify-content: center; }
.modal-backdrop {
  position: absolute; inset: 0;
  background: rgba(0,0,0,.45);
  backdrop-filter: blur(3px);
}
.modal-body {
  position: relative;
  background: white;
  border-radius: 16px;
  padding: 32px 28px;
  max-width: 420px;
  width: 90%;
  box-shadow: 0 24px 64px rgba(0,0,0,.2);
}
.modal-body h3 { font-size: 18px; color: var(--blue); margin-bottom: 10px; }
.modal-body p  { color: var(--gray); font-size: 14px; margin-bottom: 24px; line-height: 1.6; }
.modal-actions { display: flex; gap: 10px; justify-content: flex-end; }

/* ═══════════════════════════════════════════
   RESULT
═══════════════════════════════════════════ */
.cefr-big {
  width: 100px; height: 100px;
  border-radius: 50%;
  display: grid; place-items: center;
  font-size: 32px;
  font-weight: 900;
  margin: 0 auto 12px;
  letter-spacing: 1px;
}
.cefr-big.pass   { background: var(--green-bg); color: var(--green); }
.cefr-big.review { background: var(--yellow-bg); color: var(--yellow); }
.cefr-big.fail   { background: var(--red-bg); color: var(--red); }

.cefr-label {
  font-size: 15px;
  color: var(--gray);
  margin-bottom: 20px;
}

.result-score-total {
  font-size: 52px;
  font-weight: 900;
  color: var(--blue);
  line-height: 1;
  margin-bottom: 4px;
}
.result-max { font-size: 22px; color: var(--gray); font-weight: 600; }

.result-bars { margin: 24px 0; text-align: left; }
.rbar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}
.rbar-label { font-size: 13px; font-weight: 600; width: 90px; flex-shrink: 0; }
.rbar-track {
  flex: 1;
  height: 10px;
  background: #F3F4F6;
  border-radius: 20px;
  overflow: hidden;
}
.rbar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--blue), var(--blue2));
  border-radius: 20px;
  transition: width 1s ease;
}
.rbar-val { font-size: 13px; font-weight: 700; color: var(--blue); width: 40px; text-align: right; }

.result-meta {
  background: #F9FAFB;
  border-radius: 10px;
  padding: 14px 16px;
  font-size: 13px;
  color: var(--gray);
  margin-bottom: 24px;
  text-align: left;
  line-height: 1.8;
}
.result-meta strong { color: #374151; }

.result-actions { display: flex; gap: 10px; justify-content: center; }

/* ═══════════════════════════════════════════
   LOADING OVERLAY
═══════════════════════════════════════════ */
#loading-overlay {
  display: none;
  position: fixed; inset: 0; z-index: 9999;
  background: rgba(255,255,255,.85);
  backdrop-filter: blur(4px);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
}
#loading-overlay.show { display: flex; }
.spinner {
  width: 44px; height: 44px;
  border: 4px solid #E5E7EB;
  border-top-color: var(--blue2);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-text { font-size: 15px; font-weight: 600; color: var(--blue); }

/* ── Dark Mode Overrides ── */
.dark {
  --bg:      #0F172A;
  --white:   #1E293B;
  --border:  #334155;
  --gray:    #94A3B8;
  --blue:    #38BDF8;
  --blue2:   #0284C7;
}
.dark body {
  color: #E2E8F0;
}
.dark h1, .dark h2, .dark h3 {
  color: #F8FAFC !important;
}
.dark .field label, .dark .consent-label {
  color: #CBD5E1;
}
.dark .field input, .dark .field select, .dark .field textarea {
  background: #0F172A;
  border-color: #334155;
  color: #F8FAFC;
}
.dark .consent-box {
  background: #1E293B;
}
.dark .info-box {
  background: rgba(30, 64, 175, 0.2);
  border-color: rgba(30, 64, 175, 0.4);
  color: #93C5FD;
}
.dark .btn-ghost {
  background: #1E293B;
  color: #38BDF8;
  border-color: #334155;
}
.dark .btn-ghost:hover {
  background: #334155;
  border-color: #38BDF8;
}
.dark .exam-header {
  background: #0F172A;
  border-bottom-color: #334155;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}
.dark .tab {
  background: #1E293B;
  border-color: #334155;
  color: #94A3B8;
}
.dark .tab:hover {
  border-color: #0284C7;
  color: #F8FAFC;
}
.dark .tab.active {
  background: linear-gradient(135deg, #0C2340, #1A73E8);
  color: white;
}
.dark .tab:not(.active) .tab-prog {
  background: #334155;
  color: #CBD5E1;
}
.dark .timer {
  color: #38BDF8;
}
.dark .track-intro, .dark .q-card {
  background: #1E293B;
  border-color: #334155;
}
.dark .passage {
  background: #0F172A;
  color: #CBD5E1;
  border-left-color: #0284C7;
}
.dark .q-text {
  color: #F8FAFC;
}
.dark .option {
  border-color: #334155;
  color: #CBD5E1;
}
.dark .option:hover {
  background: rgba(2, 132, 199, 0.1);
  border-color: #38BDF8;
}
.dark .option.selected {
  background: rgba(2, 132, 199, 0.15);
  border-color: #38BDF8;
  color: #F8FAFC;
}
.dark .option-letter {
  background: #334155;
  color: #94A3B8;
}
.dark .writing-prompt {
  background: rgba(146, 64, 14, 0.15);
  border-color: rgba(253, 230, 138, 0.2);
  color: #FCD34D;
}
.dark .writing-meta span {
  background: #334155;
}
.dark .modal-body {
  background: #1E293B;
}
.dark .modal-body h3 {
  color: #F8FAFC;
}
.dark .result-score-total {
  color: #38BDF8;
}
.dark .rbar-track {
  background: #334155;
}
.dark .rbar-val {
  color: #38BDF8;
}
.dark .result-meta {
  background: #0F172A;
  color: #94A3B8;
}
.dark .result-meta strong {
  color: #E2E8F0;
}
.dark #loading-overlay {
  background: rgba(15, 23, 42, 0.85);
}
.dark .loading-text {
  color: #38BDF8;
}