/* =====================================================================
   Base & Reset
   ===================================================================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --blue:      #1d4ed8;
  --blue-light:#3b82f6;
  --green:     #16a34a;
  --green-bg:  #dcfce7;
  --red:       #dc2626;
  --red-bg:    #fee2e2;
  --gold:      #d97706;
  --gold-bg:   #fef3c7;
  --gray-50:   #f8fafc;
  --gray-100:  #f1f5f9;
  --gray-200:  #e2e8f0;
  --gray-400:  #94a3b8;
  --gray-600:  #475569;
  --gray-800:  #1e293b;
  --header-h:  56px;
  --panel-w:   320px;
  --radius:    8px;
  --shadow:    0 1px 4px rgba(0,0,0,.12);
  --shadow-lg: 0 8px 32px rgba(0,0,0,.18);
}

html, body {
  height: 100%;
  font-family: "Segoe UI", Arial, sans-serif;
  font-size: 15px;
  color: var(--gray-800);
  background: var(--gray-100);
  direction: rtl;
}

/* =====================================================================
   Header
   ===================================================================== */
.app-header {
  position: fixed;
  inset-inline: 0;
  top: 0;
  height: var(--header-h);
  background: #fff;
  border-bottom: 1px solid var(--gray-200);
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  z-index: 100;
  gap: 12px;
}

.app-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--blue);
  white-space: nowrap;
  flex-shrink: 0;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.pdf-select {
  height: 36px;
  padding: 0 10px;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  font-size: 14px;
  background: var(--gray-50);
  cursor: pointer;
  direction: rtl;
  min-width: 200px;
}

.progress-badge {
  background: var(--gray-100);
  border: 1px solid var(--gray-200);
  border-radius: 20px;
  padding: 4px 12px;
  font-size: 13px;
  color: var(--gray-600);
  white-space: nowrap;
}

.btn-grade {
  height: 36px;
  padding: 0 18px;
  background: var(--blue);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s;
  white-space: nowrap;
}
.btn-grade:hover:not(:disabled) { background: var(--blue-light); }
.btn-grade:disabled { opacity: .45; cursor: not-allowed; }

.btn-stats {
  height: 36px;
  padding: 0 14px;
  background: #6366f1;
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s;
  white-space: nowrap;
}
.btn-stats:hover { background: #4f46e5; }

.btn-auth {
  height: 36px;
  padding: 0 14px;
  background: transparent;
  color: var(--gray-600);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all .15s;
  white-space: nowrap;
}
.btn-auth:hover { border-color: var(--blue); color: var(--blue); }
.btn-auth.logged-in { color: var(--green); border-color: var(--green); }

/* =====================================================================
   Welcome screen
   ===================================================================== */
.welcome-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  height: calc(100vh - var(--header-h));
  margin-top: var(--header-h);
}

.welcome-card {
  text-align: center;
  background: #fff;
  border-radius: 16px;
  padding: 48px 56px;
  box-shadow: var(--shadow-lg);
}
.welcome-icon { font-size: 56px; margin-bottom: 16px; }
.welcome-card h2 { font-size: 24px; margin-bottom: 8px; color: var(--blue); }
.welcome-card p { color: var(--gray-600); font-size: 15px; }

/* =====================================================================
   Main layout (PDF + Answer panel)
   ===================================================================== */
.app-layout {
  display: flex;
  flex-direction: row-reverse;   /* RTL: answer panel on right, PDF on left */
  height: calc(100vh - var(--header-h));
  margin-top: var(--header-h);
  overflow: hidden;
}

/* PDF viewer */
.pdf-pane {
  flex: 1;
  background: #525659;
  overflow: hidden;
}
.pdf-pane iframe {
  width: 100%;
  height: 100%;
  border: none;
  display: block;
}

/* Answer panel */
.answer-pane {
  width: var(--panel-w);
  flex-shrink: 0;
  background: #fff;
  border-inline-start: 1px solid var(--gray-200);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Loading / error states inside panel */
.panel-loading,
.panel-error {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 40px 20px;
  color: var(--gray-600);
  text-align: center;
  flex: 1;
}
.panel-error { color: var(--red); }

/* =====================================================================
   Spinner
   ===================================================================== */
.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--gray-200);
  border-top-color: var(--blue);
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* =====================================================================
   Answer sections
   ===================================================================== */
.answer-sections {
  flex: 1;
  overflow-y: auto;
  padding-bottom: 24px;
}

/* Section block */
.section-block {
  margin-top: 12px;
}

.section-title {
  position: sticky;
  top: 0;
  background: var(--blue);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  padding: 8px 14px;
  z-index: 10;
  letter-spacing: .3px;
}

/* Part within section */
.part-block { padding: 4px 0; }

.part-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--gray-400);
  padding: 6px 14px 2px;
  text-transform: uppercase;
  letter-spacing: .4px;
}

/* Question row */
.question-row {
  display: flex;
  align-items: center;
  padding: 3px 10px;
  gap: 6px;
  border-bottom: 1px solid var(--gray-100);
  transition: background .1s;
}
.question-row:hover { background: var(--gray-50); }

.q-num {
  min-width: 30px;
  font-size: 12px;
  color: var(--gray-400);
  text-align: start;
  flex-shrink: 0;
  direction: ltr;        /* numbers always LTR */
}

.options {
  display: flex;
  gap: 4px;
  direction: ltr;        /* option buttons always LTR: 1 2 3 4 */
}

/* Option button */
.opt-btn {
  width: 32px;
  height: 32px;
  border: 1.5px solid var(--gray-200);
  border-radius: 50%;
  background: #fff;
  font-size: 13px;
  font-weight: 600;
  color: var(--gray-600);
  cursor: pointer;
  transition: border-color .12s, background .12s, color .12s, transform .08s;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}
.opt-btn:hover:not(:disabled) {
  border-color: var(--blue-light);
  color: var(--blue);
  background: #eff6ff;
  transform: scale(1.08);
}

/* Selected (before grading) */
.opt-btn.selected {
  background: var(--blue);
  border-color: var(--blue);
  color: #fff;
}

/* After grading */
.opt-btn.grade-correct {
  background: var(--green);
  border-color: var(--green);
  color: #fff;
}
.opt-btn.grade-wrong {
  background: var(--red);
  border-color: var(--red);
  color: #fff;
}
/* The correct answer when user picked wrong */
.opt-btn.grade-show-correct {
  border-color: var(--green);
  color: var(--green);
  background: var(--green-bg);
}

.opt-btn:disabled { cursor: default; }

/* Unanswered question row */
.question-row--unanswered {
  background: #fffbeb;
  border-inline-start: 3px solid var(--gold);
}
.question-row--unanswered:hover { background: #fef3c7; }

.q-unanswered-tag {
  margin-inline-start: auto;
  font-size: 10px;
  font-weight: 700;
  color: var(--gold);
  background: var(--gold-bg);
  border: 1px solid var(--gold);
  border-radius: 10px;
  padding: 2px 7px;
  white-space: nowrap;
  flex-shrink: 0;
}

/* =====================================================================
   Results overlay
   ===================================================================== */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.55);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: 20px;
}

.results-modal {
  background: #fff;
  border-radius: 16px;
  padding: 36px 40px;
  width: 100%;
  max-width: 560px;
  max-height: 85vh;
  overflow-y: auto;
  position: relative;
  box-shadow: var(--shadow-lg);
  direction: rtl;
}

.close-btn {
  position: absolute;
  top: 14px;
  left: 14px;
  background: none;
  border: none;
  font-size: 20px;
  cursor: pointer;
  color: var(--gray-400);
  line-height: 1;
  padding: 4px;
}
.close-btn:hover { color: var(--gray-800); }

.results-heading {
  text-align: center;
  font-size: 22px;
  color: var(--blue);
  margin-bottom: 24px;
}

/* Score ring */
.score-ring-wrap {
  position: relative;
  width: 120px;
  height: 120px;
  margin: 0 auto 28px;
}
.score-ring { width: 120px; height: 120px; transform: rotate(-90deg); }
.ring-bg  { fill: none; stroke: var(--gray-200); stroke-width: 10; }
.ring-fill { fill: none; stroke: var(--blue); stroke-width: 10;
             stroke-linecap: round; transition: stroke-dasharray .6s ease; }
.score-text {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  line-height: 1.1;
}
.score-num   { font-size: 28px; font-weight: 700; color: var(--blue); }
.score-denom { font-size: 14px; color: var(--gray-400); }

/* Breakdown table */
.results-breakdown { display: flex; flex-direction: column; gap: 10px; }

.result-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 14px;
  border-radius: var(--radius);
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
}
.result-row .section-name { font-size: 14px; font-weight: 600; }
.result-row .part-name    { font-size: 12px; color: var(--gray-600); margin-top: 2px; }
.result-score {
  font-size: 15px;
  font-weight: 700;
  color: var(--green);
  direction: ltr;
  white-space: nowrap;
}

/* =====================================================================
   Psychometric score section (inside results modal)
   ===================================================================== */
.psycho-scores {
  margin-top: 24px;
  border-top: 2px solid var(--gray-200);
  padding-top: 20px;
}

.psych-section-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--blue);
  margin-bottom: 14px;
  text-align: center;
  letter-spacing: .3px;
}

/* Topic cards row */
.psych-topics {
  display: flex;
  gap: 10px;
  margin-bottom: 18px;
}

.psych-topic-card {
  flex: 1;
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: 10px;
  padding: 12px 8px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.psych-topic-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--gray-600);
  line-height: 1.2;
}

.psych-topic-raw {
  font-size: 11px;
  color: var(--gray-400);
}

.psych-topic-uniform {
  font-size: 26px;
  font-weight: 800;
  color: var(--blue);
  line-height: 1.1;
  margin-top: 4px;
}

.psych-topic-uniform-lbl {
  font-size: 10px;
  color: var(--gray-400);
}

.psych-topic-card--clickable {
  cursor: pointer;
  transition: transform .15s, box-shadow .15s, border-color .15s;
  border-color: var(--blue);
}
.psych-topic-card--clickable:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(29,78,216,.18);
  background: #eff6ff;
}

.psych-topic-chart-hint {
  font-size: 10px;
  color: var(--blue);
  margin-top: 4px;
  font-weight: 600;
  opacity: .75;
}

/* Composite rows */
.psych-composites {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.psych-comp-header {
  display: grid;
  grid-template-columns: 1fr auto auto auto;
  gap: 10px;
  align-items: center;
  padding: 0 12px 4px;
  font-size: 11px;
  font-weight: 700;
  color: var(--gray-400);
  text-transform: uppercase;
  letter-spacing: .4px;
}

.psych-composite-row {
  display: grid;
  grid-template-columns: 1fr auto auto auto;
  gap: 10px;
  align-items: center;
  padding: 10px 12px;
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  transition: background .15s;
}

.psych-composite-row:hover { background: #e0e7ff; }

.psych-comp-label {
  font-size: 13px;
  font-weight: 700;
  color: var(--gray-800);
}

.psych-comp-weighted {
  font-size: 15px;
  font-weight: 800;
  color: var(--blue);
  direction: ltr;
  white-space: nowrap;
  min-width: 28px;
  text-align: center;
}

.psych-comp-arrow {
  color: var(--gray-400);
  font-size: 13px;
}

.psych-comp-result {
  font-size: 14px;
  font-weight: 700;
  color: var(--green);
  direction: ltr;
  white-space: nowrap;
  min-width: 72px;
  text-align: start;
}

.psych-disclaimer {
  font-size: 11px;
  color: var(--gray-400);
  text-align: center;
  margin-top: 12px;
  line-height: 1.5;
}

/* =====================================================================
   Auth modal
   ===================================================================== */
.auth-modal {
  background: #fff;
  border-radius: 16px;
  padding: 36px 40px 32px;
  width: 100%;
  max-width: 380px;
  position: relative;
  box-shadow: var(--shadow-lg);
  direction: rtl;
}

.auth-tabs {
  display: flex;
  gap: 0;
  margin-bottom: 24px;
  border-bottom: 2px solid var(--gray-200);
}
.auth-tab {
  flex: 1;
  background: none;
  border: none;
  padding: 10px 0;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  color: var(--gray-400);
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  transition: color .15s, border-color .15s;
}
.auth-tab.active { color: var(--blue); border-bottom-color: var(--blue); }

.auth-error {
  background: var(--red-bg);
  color: var(--red);
  border-radius: var(--radius);
  padding: 8px 12px;
  font-size: 13px;
  margin-bottom: 16px;
}

.auth-form { display: flex; flex-direction: column; gap: 16px; }
.auth-label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--gray-800);
}
.auth-input {
  height: 40px;
  padding: 0 12px;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  font-size: 14px;
  direction: ltr;
  text-align: right;
  transition: border-color .15s;
}
.auth-input:focus { outline: none; border-color: var(--blue); }

.btn-auth-submit {
  height: 42px;
  background: var(--blue);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: background .15s;
  margin-top: 4px;
}
.btn-auth-submit:hover { background: var(--blue-light); }
.btn-auth-submit:disabled { opacity: .5; cursor: not-allowed; }

/* =====================================================================
   Stats modal
   ===================================================================== */
.stats-modal {
  background: #fff;
  border-radius: 16px;
  width: min(820px, 96vw);
  max-height: 88vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
  direction: rtl;
  overflow: hidden;
}
.stats-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--gray-200);
  flex-shrink: 0;
  position: relative;
}
.stats-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--blue);
}

.stats-body {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
}

.stats-login-prompt {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 60px 0;
  color: var(--gray-600);
  font-size: 15px;
}

/* Summary cards */
.stats-summary {
  display: flex;
  gap: 14px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}
.stat-card {
  flex: 1;
  min-width: 120px;
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: 12px;
  padding: 16px 18px;
  text-align: center;
}
.stat-card-val {
  font-size: 28px;
  font-weight: 800;
  color: var(--blue);
  line-height: 1;
  margin-bottom: 4px;
}
.stat-card-lbl { font-size: 12px; color: var(--gray-600); }

/* Per-test section */
.stats-test-block {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: 12px;
  margin-bottom: 16px;
  overflow: hidden;
}
.stats-test-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 18px;
  background: #fff;
  border-bottom: 1px solid var(--gray-200);
  cursor: pointer;
  user-select: none;
  transition: background .15s;
}
.stats-test-header:hover { background: #f1f5f9; }
.stats-test-name { font-size: 15px; font-weight: 700; color: var(--gray-800); }
.stats-test-meta { font-size: 13px; color: var(--gray-600); }
.stats-test-chevron { color: var(--gray-400); font-size: 12px; transition: transform .2s; }
.stats-test-header.open .stats-test-chevron { transform: rotate(180deg); }

.stats-attempts-list {
  padding: 10px 18px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.stats-attempt-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  border-radius: 6px;
  background: #fff;
  border: 1px solid var(--gray-200);
  font-size: 13px;
  gap: 8px;
}
.attempt-section { color: var(--gray-600); flex: 1; }
.attempt-part { font-weight: 600; }
.attempt-score {
  font-weight: 700;
  direction: ltr;
  white-space: nowrap;
}
.attempt-score.good  { color: var(--green); }
.attempt-score.ok    { color: var(--gold);  }
.attempt-score.bad   { color: var(--red);   }
.attempt-date { font-size: 11px; color: var(--gray-400); white-space: nowrap; }

.attempt-chart-btn {
  background: none;
  border: 1px solid var(--gray-200);
  border-radius: 6px;
  padding: 2px 6px;
  font-size: 14px;
  cursor: pointer;
  transition: background .15s, border-color .15s;
  flex-shrink: 0;
  line-height: 1.4;
}
.attempt-chart-btn:hover { background: #eff6ff; border-color: var(--blue); }

.stats-empty {
  text-align: center;
  color: var(--gray-400);
  padding: 40px 0;
  font-size: 15px;
}

/* Timing section inside stats page */
.stats-timing-block {
  margin-top: 28px;
  border-top: 2px solid var(--gray-200);
  padding-top: 20px;
}

.stats-timing-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--blue);
  margin-bottom: 14px;
}

.stats-timing-cards {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.stats-timing-card {
  flex: 1;
  min-width: 140px;
  background: var(--gray-50);
  border: 1.5px solid var(--blue);
  border-radius: 12px;
  padding: 18px 12px;
  text-align: center;
  cursor: pointer;
  transition: transform .15s, box-shadow .15s, background .15s;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.stats-timing-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(29,78,216,.18);
  background: #eff6ff;
}

.stats-timing-card-icon { font-size: 26px; }
.stats-timing-card-label { font-size: 13px; font-weight: 700; color: var(--gray-800); }
.stats-timing-card-hint { font-size: 11px; color: var(--blue); opacity: .8; }

/* =====================================================================
   Sim panel — sticky top bar inside the answer pane
   ===================================================================== */
.sim-bar {
  flex-shrink: 0;
  background: var(--gray-800);
  color: #fff;
  padding: 12px 14px 10px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  border-bottom: 2px solid var(--gold);
}
.sim-bar-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 11px;
  color: var(--gray-400);
}
.sim-bar-section { font-weight: 600; color: #cbd5e1; }
.sim-bar-counter  { font-size: 11px; color: var(--gray-400); direction: ltr; }
.sim-bar-part {
  font-size: 14px;
  font-weight: 700;
  color: #fff;
}

/* Countdown */
.sim-countdown {
  font-size: 32px;
  font-weight: 800;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
  letter-spacing: 2px;
  line-height: 1;
  margin-top: 4px;
  transition: color .3s;
}
.sim-countdown.warn   { color: #fb923c; }   /* < 5 min */
.sim-countdown.urgent {
  color: var(--red);
  animation: countdown-blink .6s step-start infinite;
}
@keyframes countdown-blink {
  50% { opacity: .35; }
}

/* Sim sticky footer */
.sim-footer {
  flex-shrink: 0;
  padding: 10px 12px;
  background: #fff;
  border-top: 1px solid var(--gray-200);
}
.btn-sim-submit {
  width: 100%;
  height: 42px;
  background: var(--blue);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: background .15s, transform .1s;
}
.btn-sim-submit:hover:not(:disabled) { background: var(--blue-light); }
.btn-sim-submit:active:not(:disabled) { transform: scale(.97); }
.btn-sim-submit.last { background: var(--green); }
.btn-sim-submit.last:hover:not(:disabled) { background: #15803d; }
.btn-sim-submit:disabled { opacity: .45; cursor: not-allowed; }

/* Make answer-pane a flex-col so sticky header/footer work */
.answer-pane {
  display: flex;
  flex-direction: column;
}
.answer-sections { flex: 1; }   /* already has overflow-y:auto from earlier rule */

/* =====================================================================
   Simulation toggle button
   ===================================================================== */
.btn-sim {
  height: 36px;
  padding: 0 14px;
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius);
  background: #fff;
  color: var(--gray-600);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: border-color .15s, background .15s, color .15s;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 5px;
}
.btn-sim:hover:not(:disabled) { border-color: var(--gold); color: var(--gold); }
.btn-sim:disabled { opacity: .4; cursor: not-allowed; }
.btn-sim.active {
  background: var(--gold);
  border-color: var(--gold);
  color: #fff;
}

/* =====================================================================
   Button click animation
   ===================================================================== */

/* Elastic bounce on press */
@keyframes btn-pop {
  0%   { transform: scale(1); }
  25%  { transform: scale(0.75); }
  60%  { transform: scale(1.22); }
  80%  { transform: scale(0.95); }
  100% { transform: scale(1); }
}
.opt-btn.btn-pop { animation: btn-pop 0.32s cubic-bezier(.36,.07,.19,.97) both; }

/* Ripple wave from centre */
.opt-btn { position: relative; overflow: hidden; }

.btn-ripple {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.55);
  transform: scale(0);
  animation: ripple-expand 0.45s ease-out forwards;
  pointer-events: none;
}
@keyframes ripple-expand {
  to { transform: scale(2.8); opacity: 0; }
}

/* Selected state: pulse ring */
@keyframes btn-select-ring {
  0%   { box-shadow: 0 0 0 0   rgba(29,78,216,.7); }
  60%  { box-shadow: 0 0 0 8px rgba(29,78,216,0);  }
  100% { box-shadow: 0 0 0 8px rgba(29,78,216,0);  }
}
.opt-btn.selected { animation: btn-select-ring .4s ease-out both; }

/* =====================================================================
   Time analysis (simulation results)
   ===================================================================== */
.time-analysis {
  margin-top: 24px;
  border-top: 2px solid var(--gold-bg);
  padding-top: 18px;
}
.time-analysis-title {
  font-size: 16px;
  color: var(--gold);
  margin-bottom: 12px;
}
.time-summary {
  display: flex;
  gap: 20px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}
.time-stat {
  background: var(--gold-bg);
  border: 1px solid #fcd34d;
  border-radius: var(--radius);
  padding: 8px 14px;
  font-size: 13px;
  color: var(--gold);
}
.time-stat strong { font-size: 16px; }

.time-table-header {
  font-size: 12px;
  font-weight: 700;
  color: var(--gray-400);
  text-transform: uppercase;
  letter-spacing: .4px;
  margin-bottom: 6px;
}
.time-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 7px 10px;
  border-radius: 6px;
  margin-bottom: 3px;
  background: var(--gray-50);
  font-size: 13px;
  gap: 8px;
}
.time-row.slow { background: #fff7ed; border-inline-start: 3px solid var(--gold); }
.time-row.very-slow { background: var(--red-bg); border-inline-start: 3px solid var(--red); }
.tr-section { color: var(--gray-600); flex: 1; font-size: 12px; }
.tr-q       { font-weight: 600; white-space: nowrap; }
.tr-time    { font-weight: 700; color: var(--gray-800); direction: ltr; min-width: 42px; text-align: end; }
.time-row.slow .tr-time      { color: var(--gold); }
.time-row.very-slow .tr-time { color: var(--red); }

/* Clickable part rows */
.time-row-clickable { cursor: pointer; transition: background .15s; }
.time-row-clickable:hover { background: #e0e7ff; }
.tr-chevron { font-size: 11px; color: var(--gray-400); margin-inline-start: 4px; }

/* =====================================================================
   Chart overlay / modal
   ===================================================================== */
.chart-modal {
  background: #fff;
  border-radius: 16px;
  width: min(860px, 96vw);
  max-height: 88vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 24px 64px rgba(0,0,0,.35);
  overflow: hidden;
}
.chart-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px 12px;
  border-bottom: 1px solid var(--gray-200);
  flex-shrink: 0;
}
.chart-modal-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--gray-900);
  margin: 0;
}
.chart-modal-body {
  flex: 1;
  position: relative;
  padding: 24px 20px 20px;
  overflow: hidden;
}
.chart-svg {
  width: 100%;
  height: 100%;
  display: block;
  min-height: 300px;
}

/* Hover tooltip */
.chart-tooltip {
  position: absolute;
  background: rgba(15,23,42,.88);
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 8px;
  pointer-events: none;
  white-space: nowrap;
  transform: translate(-50%, -120%);
  transition: opacity .1s;
  z-index: 10;
}
.chart-tooltip.hidden { opacity: 0; }

/* =====================================================================
   Utilities
   ===================================================================== */
.hidden { display: none !important; }