/* ============================================================
   BUSINESS ENGLISH PRO™ – MAIN STYLESHEET
   ============================================================ */

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

:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #eff6ff;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --purple: #8b5cf6;
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;
  --white: #ffffff;
  --radius: 14px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 48px rgba(0,0,0,0.14);
  --transition: all 0.22s cubic-bezier(0.4, 0, 0.2, 1);
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--gray-50);
  color: var(--gray-800);
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
}

/* ── SCREENS ── */
.screen { display: none; min-height: 100vh; }
.screen.active { display: block; }

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 32px 20px;
}

/* ── HEADER ── */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  height: 60px;
  background: var(--white);
  border-bottom: 1px solid var(--gray-200);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.header-logo {
  font-weight: 700;
  font-size: 1rem;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.header-user {
  font-size: 0.85rem;
  color: var(--gray-600);
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ── WELCOME SCREEN ── */
#screen-welcome {
  background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 40%, #0ea5e9 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.welcome-bg {
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='80' height='80' viewBox='0 0 80 80' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Ccircle cx='40' cy='40' r='38' stroke='rgba(255,255,255,0.05)' stroke-width='2'/%3E%3C/svg%3E") repeat;
  opacity: 0.5;
}

.welcome-content {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 560px;
  padding: 48px 32px;
  text-align: center;
}

.logo-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin-bottom: 36px;
}

.logo-icon {
  width: 52px; height: 52px;
  background: rgba(255,255,255,0.15);
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
  color: white;
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.2);
}

.logo-text { text-align: left; }
.logo-title { display: block; font-size: 1.15rem; font-weight: 700; color: white; }
.logo-sub { display: block; font-size: 0.78rem; color: rgba(255,255,255,0.7); }

.welcome-headline {
  font-size: clamp(2rem, 5vw, 2.8rem);
  font-weight: 800;
  color: white;
  line-height: 1.15;
  margin-bottom: 16px;
}

.welcome-headline .highlight {
  background: linear-gradient(90deg, #fbbf24, #f97316);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.welcome-desc {
  color: rgba(255,255,255,0.8);
  font-size: 0.95rem;
  margin-bottom: 32px;
}

.welcome-features {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.feat {
  display: flex;
  align-items: center;
  gap: 7px;
  background: rgba(255,255,255,0.12);
  backdrop-filter: blur(8px);
  padding: 8px 16px;
  border-radius: 24px;
  color: white;
  font-size: 0.82rem;
  font-weight: 500;
  border: 1px solid rgba(255,255,255,0.2);
}

.name-section { text-align: left; }
.name-section label {
  display: block;
  color: rgba(255,255,255,0.85);
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 10px;
}

.name-row {
  display: flex;
  gap: 10px;
}

.name-row input {
  flex: 1;
  padding: 13px 18px;
  border-radius: var(--radius-sm);
  border: 2px solid rgba(255,255,255,0.3);
  background: rgba(255,255,255,0.12);
  color: white;
  font-size: 0.95rem;
  font-family: inherit;
  outline: none;
  transition: var(--transition);
  backdrop-filter: blur(8px);
}

.name-row input::placeholder { color: rgba(255,255,255,0.5); }
.name-row input:focus { border-color: rgba(255,255,255,0.7); background: rgba(255,255,255,0.2); }

.error-msg { color: #fca5a5; font-size: 0.82rem; margin-top: 8px; }
.hidden { display: none !important; }

.resume-section { margin-top: 20px; }
.resume-card {
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(255,255,255,0.12);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  color: rgba(255,255,255,0.9);
  font-size: 0.87rem;
  flex-wrap: wrap;
}

/* ── BUTTONS ── */
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 24px;
  background: white;
  color: var(--primary);
  border: none;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-primary:hover { background: #f0f7ff; transform: translateY(-1px); box-shadow: 0 4px 16px rgba(0,0,0,0.15); }
.btn-primary.large { padding: 14px 30px; font-size: 1rem; border-radius: var(--radius); }

.btn-secondary {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 20px;
  background: var(--gray-100);
  color: var(--gray-700);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.btn-secondary:hover { background: var(--gray-200); }
.btn-secondary.large { padding: 14px 28px; font-size: 0.95rem; border-radius: var(--radius); }
.btn-secondary.small { padding: 6px 14px; font-size: 0.8rem; }

.btn-ghost {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 16px;
  background: transparent;
  color: rgba(255,255,255,0.85);
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.btn-ghost:hover { background: rgba(255,255,255,0.1); }
.btn-ghost.large { padding: 14px 28px; font-size: 0.95rem; border-radius: var(--radius); color: var(--gray-600); border-color: var(--gray-300); }
.btn-ghost.large:hover { background: var(--gray-100); }
.btn-ghost.small { padding: 6px 12px; font-size: 0.8rem; }
.btn-ghost.back-btn { color: var(--gray-600); border-color: var(--gray-300); }
.btn-ghost.back-btn:hover { background: var(--gray-100); }

.btn-danger {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 24px;
  background: var(--danger);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.btn-danger:hover { background: #dc2626; }

.btn-outline-color, .btn-filled-color {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 9px 16px;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.84rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-outline-color {
  background: white;
  border: 2px solid;
}
.btn-outline-color:hover { opacity: 0.85; }

.btn-filled-color {
  color: white;
  border: none;
}
.btn-filled-color:hover { opacity: 0.88; transform: translateY(-1px); }

/* ── LEVEL CARDS ── */
.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--gray-800);
  margin-bottom: 6px;
}

.section-sub {
  color: var(--gray-500);
  font-size: 0.9rem;
  margin-bottom: 28px;
}

.levels-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  margin-bottom: 32px;
}

.level-card {
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: var(--transition);
}

.level-card.clickable:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.level-card.locked { opacity: 0.7; }

.level-card-top {
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  position: relative;
}

.level-icon {
  width: 44px; height: 44px;
  background: rgba(255,255,255,0.2);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  color: white;
  font-size: 1.2rem;
}

.level-number { font-size: 0.85rem; font-weight: 700; color: rgba(255,255,255,0.9); }

.level-check-badge {
  position: absolute; right: 16px; top: 50%; transform: translateY(-50%);
  width: 32px; height: 32px;
  background: rgba(255,255,255,0.25);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: white;
  font-size: 1rem;
}

.level-card-body { padding: 18px; }

.level-status {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: 0.78rem; font-weight: 600;
  padding: 4px 10px;
  border-radius: 20px;
  margin-bottom: 10px;
}

.level-pending .level-status { background: #eff6ff; color: #2563eb; }
.level-completed .level-status { background: #ecfdf5; color: #059669; }
.level-locked .level-status { background: var(--gray-100); color: var(--gray-500); }
.level-attempted .level-status { background: #fffbeb; color: #d97706; }

.level-card h3 { font-size: 1rem; font-weight: 700; color: var(--gray-800); margin-bottom: 6px; }
.level-card p { font-size: 0.83rem; color: var(--gray-500); margin-bottom: 12px; line-height: 1.5; }

.level-last-score { font-size: 0.8rem; color: var(--gray-500); margin-bottom: 10px; }
.passed-score { color: var(--success); }

.level-card-footer {
  display: flex; gap: 12px;
  font-size: 0.78rem; color: var(--gray-400);
  margin-bottom: 14px;
}

.level-card-footer span { display: flex; align-items: center; gap: 4px; }

.level-actions {
  display: flex; gap: 8px;
}

.level-locked-msg {
  color: var(--gray-400);
  font-size: 0.82rem;
  display: flex; align-items: center; gap: 6px;
  padding: 10px 0;
}

/* Overall progress */
.overall-progress-box {
  background: white;
  border-radius: var(--radius);
  padding: 24px 28px;
  box-shadow: var(--shadow);
  margin-top: 8px;
}

.op-label { display: flex; justify-content: space-between; font-weight: 600; font-size: 0.9rem; margin-bottom: 10px; }

.progress-bar-track {
  height: 10px;
  background: var(--gray-100);
  border-radius: 10px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--success));
  border-radius: 10px;
  transition: width 0.6s ease;
}

.op-detail { font-size: 0.82rem; color: var(--gray-500); margin-top: 8px; }

/* Congrats banner */
.cert-btn-wrap { margin-top: 24px; }

.congrats-banner {
  display: flex;
  align-items: center;
  gap: 16px;
  background: linear-gradient(135deg, #f59e0b, #ef4444);
  border-radius: var(--radius);
  padding: 20px 24px;
  color: white;
  flex-wrap: wrap;
}

.congrats-banner i { font-size: 2rem; }
.congrats-banner div { flex: 1; }
.congrats-banner strong { display: block; font-size: 1rem; font-weight: 700; }
.congrats-banner span { font-size: 0.85rem; opacity: 0.9; }

.btn-cert {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 22px;
  background: white;
  color: #d97706;
  border: none;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}
.btn-cert:hover { transform: scale(1.03); }

/* ── STUDY SCREEN ── */
.study-header {
  text-align: center;
  margin-bottom: 28px;
}

.study-level-badge {
  display: inline-block;
  color: white;
  padding: 6px 18px;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 700;
  margin-bottom: 10px;
}

#study-level-title { font-size: 1.4rem; font-weight: 700; margin-bottom: 6px; }
#study-level-desc { color: var(--gray-500); font-size: 0.9rem; }

.study-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-bottom: 32px;
}

.study-card {
  background: white;
  border-radius: var(--radius-sm);
  padding: 18px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  border: 1px solid var(--gray-200);
}

.study-card-q {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 10px;
  font-weight: 600;
  color: var(--gray-800);
  font-size: 0.92rem;
}

.study-q-num {
  min-width: 24px; height: 24px;
  background: var(--gray-100);
  border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--gray-600);
}

.study-card-a {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 10px 14px;
  background: var(--gray-50);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  color: var(--gray-700);
}

.study-actions { text-align: center; padding-bottom: 32px; }

/* ── QUIZ SCREEN ── */
#screen-quiz { background: var(--gray-50); }

.quiz-meta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  text-align: center;
}

#quiz-level-label { font-size: 0.78rem; font-weight: 600; }
#quiz-counter { font-size: 0.8rem; color: var(--gray-500); }

.quiz-timer-box {
  display: flex; align-items: center; gap: 6px;
  font-size: 0.88rem; font-weight: 600; color: var(--gray-700);
  background: var(--gray-100);
  padding: 6px 14px;
  border-radius: 20px;
}

.quiz-progress-track {
  height: 4px;
  background: var(--gray-200);
}

.quiz-progress-fill {
  height: 100%;
  transition: width 0.4s ease;
}

.quiz-container { padding-top: 28px; padding-bottom: 40px; }

.question-card {
  background: white;
  border-radius: var(--radius);
  padding: 32px 28px;
  box-shadow: var(--shadow);
  margin-bottom: 24px;
}

.question-card.slide-in {
  animation: slideInRight 0.25s ease;
}

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(24px); }
  to { opacity: 1; transform: translateX(0); }
}

.q-number {
  width: 36px; height: 36px;
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  color: white;
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.q-text {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--gray-800);
  line-height: 1.5;
  margin-bottom: 24px;
}

.q-options { display: flex; flex-direction: column; gap: 10px; }

.option-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 13px 16px;
  background: var(--gray-50);
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-sm);
  text-align: left;
  font-family: inherit;
  font-size: 0.9rem;
  color: var(--gray-700);
  cursor: pointer;
  transition: var(--transition);
  width: 100%;
}

.option-btn:hover:not(.selected) { border-color: var(--gray-400); background: white; }
.option-btn.selected { font-weight: 600; color: var(--gray-800); }

.option-letter {
  min-width: 30px; height: 30px;
  background: var(--gray-200);
  border-radius: 7px;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.78rem;
  font-weight: 700;
  transition: var(--transition);
  color: var(--gray-600);
}

.option-btn.selected .option-letter {
  color: white;
}

/* Quiz Nav */
.quiz-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.answer-dots {
  display: flex;
  gap: 5px;
  flex-wrap: wrap;
  justify-content: center;
  flex: 1;
}

.answer-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--gray-200);
  border: 2px solid transparent;
  cursor: pointer;
  transition: var(--transition);
}

.answer-dot.answered { }
.answer-dot.current { transform: scale(1.4); }

/* ── RESULTS SCREEN ── */
.results-container { max-width: 720px; }

.result-card {
  background: white;
  border-radius: var(--radius);
  padding: 40px 32px;
  box-shadow: var(--shadow);
  text-align: center;
}

.result-icon { font-size: 3rem; margin-bottom: 12px; }
.result-card h2 { font-size: 1.6rem; font-weight: 800; margin-bottom: 6px; }
.result-level { color: var(--gray-500); font-size: 0.9rem; margin-bottom: 24px; }

.score-circle-wrap { display: flex; justify-content: center; margin-bottom: 16px; }

.score-circle {
  position: relative;
  width: 140px; height: 140px;
}

.score-circle svg { width: 100%; height: 100%; }

.score-text {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

#score-pct { font-size: 1.8rem; font-weight: 800; color: var(--gray-800); }
#score-fraction { font-size: 0.75rem; color: var(--gray-500); }

.result-badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 20px;
  border-radius: 24px;
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 16px;
}

.passed-badge { background: #ecfdf5; color: #059669; }
.failed-badge { background: #fef2f2; color: #dc2626; }

.result-message {
  color: var(--gray-600);
  font-size: 0.9rem;
  margin-bottom: 28px;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

/* Review */
.review-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px;
  background: var(--gray-50);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: 4px;
  transition: var(--transition);
  border: 1px solid var(--gray-200);
}
.review-toggle:hover { background: var(--gray-100); }
#review-chevron { transition: transform 0.3s ease; margin-left: auto; }

.answer-review { padding: 12px 0; }

.review-item {
  text-align: left;
  background: var(--gray-50);
  border-radius: var(--radius-sm);
  padding: 14px;
  margin-bottom: 10px;
  border-left: 4px solid;
}

.review-correct { border-color: var(--success); }
.review-wrong { border-color: var(--danger); }

.review-q-header {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin-bottom: 10px;
}

.review-num {
  min-width: 22px; height: 22px;
  background: white;
  border-radius: 5px;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--gray-600);
  border: 1px solid var(--gray-200);
  flex-shrink: 0;
}

.review-q-text { font-size: 0.88rem; font-weight: 600; color: var(--gray-800); flex: 1; }
.review-status { color: var(--gray-600); flex-shrink: 0; }
.review-correct .review-status { color: var(--success); }
.review-wrong .review-status { color: var(--danger); }

.review-options { display: flex; flex-direction: column; gap: 5px; margin-bottom: 8px; }

.review-option {
  display: flex; align-items: center; gap: 7px;
  padding: 7px 10px;
  border-radius: 6px;
  font-size: 0.82rem;
  color: var(--gray-600);
  background: white;
}

.rev-letter {
  width: 22px; height: 22px;
  background: var(--gray-100);
  border-radius: 5px;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.72rem;
  font-weight: 700;
  flex-shrink: 0;
}

.correct-opt { background: #ecfdf5; color: #065f46; font-weight: 600; }
.correct-opt .rev-letter { background: var(--success); color: white; }
.wrong-opt { background: #fef2f2; color: #991b1b; }
.wrong-opt .rev-letter { background: var(--danger); color: white; }
.rev-icon { margin-left: auto; flex-shrink: 0; }

.review-explanation {
  font-size: 0.81rem;
  color: var(--gray-600);
  display: flex; gap: 7px;
  padding: 8px 10px;
  background: #fffbeb;
  border-radius: 6px;
  line-height: 1.5;
}

.review-explanation i { color: var(--warning); margin-top: 2px; flex-shrink: 0; }

/* Result actions */
.result-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: center;
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--gray-100);
}

/* ── CERTIFICATE SCREEN ── */
.cert-container { max-width: 820px; text-align: center; }

.cert-wrapper {
  background: white;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  margin-bottom: 28px;
}

.certificate {
  font-family: 'Inter', sans-serif;
  background: white;
  padding: 0;
}

.cert-top-bar {
  height: 10px;
  background: linear-gradient(90deg, #1e3a8a, #2563eb, #0ea5e9, #f59e0b);
}

.cert-bottom-bar {
  height: 8px;
  background: linear-gradient(90deg, #f59e0b, #0ea5e9, #2563eb, #1e3a8a);
}

.cert-body { padding: 36px 48px; }

.cert-logo {
  display: flex; align-items: center; gap: 14px;
  margin-bottom: 28px;
}

.cert-logo-icon {
  width: 52px; height: 52px;
  background: linear-gradient(135deg, #1e3a8a, #2563eb);
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  color: white;
  font-size: 1.4rem;
}

.cert-brand { font-size: 1.1rem; font-weight: 800; color: #1e3a8a; }
.cert-brand-sub { font-size: 0.78rem; color: var(--gray-500); }

.cert-title-line {
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.25em;
  color: var(--gray-400);
  margin-bottom: 14px;
  text-transform: uppercase;
}

.cert-this-certifies { font-size: 1rem; color: var(--gray-500); margin-bottom: 10px; font-style: italic; }
.cert-student-name { font-size: 2.4rem; font-weight: 800; color: #1e3a8a; margin-bottom: 10px; letter-spacing: 0.03em; }
.cert-has-completed { font-size: 1rem; color: var(--gray-500); margin-bottom: 8px; }
.cert-course-name { font-size: 1.4rem; font-weight: 700; color: var(--gray-800); margin-bottom: 6px; }
.cert-levels { font-size: 0.82rem; color: var(--gray-500); margin-bottom: 28px; }

.cert-divider { height: 1px; background: var(--gray-200); margin-bottom: 24px; }

.cert-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.cert-sig { font-weight: 700; font-size: 0.9rem; color: var(--gray-700); }
.cert-sig-label { font-size: 0.75rem; color: var(--gray-400); margin-top: 2px; }

.cert-seal {
  width: 80px; height: 80px;
  background: linear-gradient(135deg, #1e3a8a, #2563eb);
  border-radius: 50%;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  color: white;
  font-size: 1.6rem;
  gap: 2px;
}

.cert-seal span { font-size: 0.55rem; font-weight: 800; letter-spacing: 0.1em; }

.cert-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ── MODAL ── */
.modal-overlay {
  position: fixed; inset: 0; z-index: 999;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
  display: flex; align-items: center; justify-content: center;
}

.modal-box {
  background: white;
  border-radius: var(--radius);
  padding: 36px 32px;
  max-width: 380px;
  width: 90%;
  text-align: center;
  box-shadow: var(--shadow-lg);
}

.modal-warn-icon { font-size: 2.5rem; color: var(--warning); margin-bottom: 14px; }
.modal-box h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 8px; }
.modal-box p { color: var(--gray-600); font-size: 0.9rem; margin-bottom: 24px; }

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

/* ── PRINT STYLES ── */
@media print {
  body * { visibility: hidden !important; }
  #screen-certificate, #screen-certificate * { visibility: visible !important; }
  .cert-actions, .app-header, .btn-ghost { display: none !important; }
  #screen-certificate { position: fixed; inset: 0; display: flex !important; align-items: center; justify-content: center; }
  .cert-wrapper { box-shadow: none; width: 100%; max-width: 750px; }
}

/* ── RESPONSIVE ── */
@media (max-width: 640px) {
  .welcome-content { padding: 32px 20px; }
  .welcome-headline { font-size: 1.8rem; }
  .name-row { flex-direction: column; }
  .levels-grid { grid-template-columns: 1fr; }
  .quiz-nav { flex-wrap: wrap; }
  .answer-dots { order: -1; width: 100%; }
  .result-card { padding: 28px 18px; }
  .cert-body { padding: 24px 20px; }
  .cert-student-name { font-size: 1.6rem; }
  .cert-bottom { flex-direction: column; gap: 20px; text-align: center; }
  .result-actions { flex-direction: column; width: 100%; }
  .result-actions .btn-primary,
  .result-actions .btn-secondary,
  .result-actions .btn-ghost { width: 100%; justify-content: center; }
  .level-actions { flex-direction: column; }
  .congrats-banner { flex-direction: column; text-align: center; }
  .welcome-features { gap: 8px; }
}

@media (max-width: 480px) {
  .quiz-container { padding: 18px 14px; }
  .question-card { padding: 20px 16px; }
  .q-text { font-size: 1rem; }
}