/* ═══════════════════════════════════════════════════════
   CDCP Simulador R25 — Professional Stylesheet
   ═══════════════════════════════════════════════════════ */

/* ── Custom Properties ── */
:root {
  --bg-base:        #0a0f1e;
  --bg-surface:     #0f172a;
  --bg-card:        #131d35;
  --bg-card-hover:  #1a2647;
  --bg-input:       #1e2d4a;
  --border:         #1e3a5f;
  --border-light:   #2a4a7f;

  --blue-900:  #1e3a8a;
  --blue-800:  #1e40af;
  --blue-700:  #1d4ed8;
  --blue-600:  #2563eb;
  --blue-500:  #3b82f6;
  --blue-400:  #60a5fa;
  --blue-300:  #93c5fd;

  --green-600: #16a34a;
  --green-500: #22c55e;
  --green-400: #4ade80;
  --green-bg:  rgba(34,197,94,0.08);

  --red-600:   #dc2626;
  --red-500:   #ef4444;
  --red-400:   #f87171;
  --red-bg:    rgba(239,68,68,0.08);

  --amber-500: #f59e0b;
  --amber-400: #fbbf24;
  --amber-bg:  rgba(245,158,11,0.08);
  --warning:   #f59e0b;

  --text-primary:   #f0f4ff;
  --text-secondary: #94a3b8;
  --text-muted:     #64748b;
  --text-dim:       #475569;

  --radius-sm: 6px;
  --radius:    10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.4);
  --shadow:    0 4px 16px rgba(0,0,0,0.5);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.6);

  --transition: 180ms ease;
  --font: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg-base);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── Screens ── */
.screen { display: none; }
.screen.active { display: block; }

/* ══════════════════════════════════════════
   WELCOME SCREEN
══════════════════════════════════════════ */
#screen-welcome {
  background:
    radial-gradient(ellipse 80% 60% at 50% -10%, rgba(59,130,246,0.12) 0%, transparent 60%),
    radial-gradient(ellipse 50% 40% at 80% 80%, rgba(99,102,241,0.06) 0%, transparent 50%),
    var(--bg-base);
}

/* ── Site Header ── */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(10,15,30,0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: 1200px; margin: 0 auto;
  padding: 14px 24px;
  display: flex; align-items: center; justify-content: space-between;
  position: relative;
}

.logo { display: none; }
.site-header { display: none; }
.logo-icon { width: 40px; height: 40px; flex-shrink: 0; }
.logo-icon--sm { width: 32px; height: 32px; }
.logo-text { display: flex; flex-direction: column; line-height: 1.1; }
.logo-main { font-size: 1.3rem; font-weight: 800; color: var(--blue-400); letter-spacing: -0.5px; }
.logo-sub  { display: none; }

.header-badge { display: flex; align-items: center; gap: 8px; position: absolute; left: 50%; transform: translateX(-50%); }
.badge-exin {
  background: var(--blue-700); color: #fff;
  font-size: 0.84rem; font-weight: 700; padding: 2px 10px;
  border-radius: 4px; letter-spacing: 0.5px;
}
.badge-cert { display: none; }

/* ── Welcome Main ── */
.welcome-main { max-width: 860px; margin: 0 auto; padding: 72px 24px 60px; }

.hero-section { max-width: 860px; margin: 0 auto; text-align: center; }

.hero-tag { display: none; }
.exin-logo { display: none; }

.hero-title {
  font-size: clamp(2rem, 4.5vw, 3rem);
  font-weight: 800; line-height: 1.15;
  color: var(--text-primary);
  letter-spacing: -1px; margin-bottom: 24px;
}

.gradient-text {
  background: linear-gradient(135deg, var(--blue-400), #818cf8);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}

.bright-white {
  color: #ffffff;
  text-shadow: 0 0 20px rgba(255,255,255,0.6), 0 0 40px rgba(255,255,255,0.3);
}

.hero-subtitle {
  font-size: 1.05rem; color: var(--text-secondary);
  max-width: 560px; margin: 0 auto 40px;
  line-height: 1.7;
}
.hero-subtitle strong { color: var(--text-primary); }

/* ── Stats ── */
.stats-row {
  display: flex; gap: 16px; justify-content: center; flex-wrap: wrap;
  margin-bottom: 40px;
}

.stat-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px 28px; text-align: center;
  min-width: 110px;
  transition: border-color var(--transition), transform var(--transition);
}
.stat-card:hover { border-color: var(--blue-500); transform: translateY(-2px); }

.stat-number {
  font-size: 1.9rem; font-weight: 800; color: var(--blue-400); line-height: 1;
  font-family: var(--font-mono);
}
.stat-number small { font-size: 1rem; font-weight: 600; }
.stat-label { font-size: 0.75rem; color: var(--text-muted); margin-top: 4px; }

/* ── Topics Grid ── */
.topics-grid { display: none; }

.topic-pill {
  display: flex; align-items: center; gap: 7px;
  background: var(--bg-card); border: 1px solid var(--border);
  color: var(--text-secondary); font-size: 0.82rem;
  padding: 6px 14px; border-radius: 999px;
}
.dot {
  width: 7px; height: 7px; border-radius: 50%; flex-shrink: 0;
}
.dot.blue    { background: #3b82f6; }
.dot.indigo  { background: #6366f1; }
.dot.emerald { background: #10b981; }
.dot.cyan    { background: #06b6d4; }
.dot.orange  { background: #f97316; }
.dot.rose    { background: #f43f5e; }
.dot.violet  { background: #8b5cf6; }
.dot.amber   { background: #f59e0b; }

/* ── Welcome Actions ── */
.welcome-actions {
  display: flex; gap: 14px; justify-content: center; margin-bottom: 0;
  flex-wrap: wrap;
}
#btn-history { display: none; }

/* ── Buttons ── */
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  background: linear-gradient(135deg, var(--blue-600), var(--blue-800));
  color: #fff; border: none; cursor: pointer;
  font-size: 1rem; font-weight: 600;
  padding: 13px 32px; border-radius: var(--radius-lg);
  transition: all var(--transition);
  box-shadow: 0 4px 20px rgba(37,99,235,0.35);
}
.btn-primary:hover {
  background: linear-gradient(135deg, var(--blue-500), var(--blue-700));
  box-shadow: 0 6px 28px rgba(37,99,235,0.5);
  transform: translateY(-1px);
}
.btn-primary:active { transform: translateY(0); }

.btn-secondary {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--bg-card); border: 1px solid var(--border-light);
  color: var(--text-secondary); cursor: pointer;
  font-size: 1rem; font-weight: 500;
  padding: 13px 28px; border-radius: var(--radius-lg);
  transition: all var(--transition);
}
.btn-secondary:hover { border-color: var(--blue-500); color: var(--blue-400); }

.btn-sm { font-size: 0.85rem; padding: 8px 18px; }

.btn-danger {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--red-600); border: none; color: #fff;
  cursor: pointer; font-size: 0.95rem; font-weight: 600;
  padding: 10px 24px; border-radius: var(--radius);
  transition: background var(--transition);
}
.btn-danger:hover { background: var(--red-500); }

.btn-danger-outline {
  background: transparent; border: 1px solid var(--red-600);
  color: var(--red-400); cursor: pointer;
  font-size: 0.85rem; padding: 8px 16px; border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.btn-danger-outline:hover { background: var(--red-bg); }

/* ── Exam Info Cards ── */
.exam-info-cards {
  display: flex; gap: 14px; justify-content: center; flex-wrap: wrap;
}

.info-card {
  display: flex; align-items: center; gap: 12px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 12px 18px;
  text-align: left;
}
.info-icon {
  width: 34px; height: 34px; border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem; flex-shrink: 0;
}
.info-icon--check { background: var(--green-bg); }
.info-icon--clock  { background: var(--amber-bg); }
.info-icon--shuffle { background: rgba(139,92,246,0.1); }

.info-content { display: flex; flex-direction: column; }
.info-content strong { font-size: 0.85rem; color: var(--text-primary); }
.info-content span   { font-size: 0.75rem; color: var(--text-muted); }

/* ── History Panel ── */
.history-panel {
  position: fixed; top: 0; right: 0; bottom: 0;
  width: 420px; max-width: 95vw;
  background: var(--bg-surface); border-left: 1px solid var(--border);
  z-index: 200; display: flex; flex-direction: column;
  transform: translateX(0); transition: transform .3s ease;
}
.history-panel.hidden { transform: translateX(100%); }

.history-panel-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 24px; border-bottom: 1px solid var(--border);
}
.history-panel-header h3 { font-size: 1rem; font-weight: 600; }

.btn-icon {
  background: transparent; border: 1px solid var(--border);
  color: var(--text-muted); cursor: pointer; width: 32px; height: 32px;
  border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center;
  font-size: 0.85rem; transition: all var(--transition);
}
.btn-icon:hover { border-color: var(--blue-500); color: var(--blue-400); }

.history-list { flex: 1; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 10px; }
.history-empty { color: var(--text-muted); text-align: center; padding: 40px 0; font-size: 0.9rem; }

.history-item {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 14px 16px;
  display: flex; align-items: center; gap: 14px;
}
.history-item.pass { border-left: 3px solid var(--green-500); }
.history-item.fail { border-left: 3px solid var(--red-500); }

.hi-score {
  width: 48px; height: 48px; border-radius: 50%;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  font-weight: 700; font-size: 1.1rem; flex-shrink: 0;
}
.hi-score.pass { background: var(--green-bg); color: var(--green-400); }
.hi-score.fail { background: var(--red-bg); color: var(--red-400); }
.hi-score small { font-size: 0.6rem; font-weight: 400; }

.hi-info { flex: 1; }
.hi-info .hi-date { font-size: 0.75rem; color: var(--text-muted); }
.hi-info .hi-desc { font-size: 0.85rem; color: var(--text-secondary); }
.hi-verdict { font-size: 0.75rem; font-weight: 600; }
.hi-verdict.pass { color: var(--green-400); }
.hi-verdict.fail { color: var(--red-400); }

.history-footer { padding: 16px 24px; border-top: 1px solid var(--border); }

.overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.5);
  z-index: 190; backdrop-filter: blur(2px);
}
.overlay.hidden { display: none; }
.hidden { display: none !important; }

/* ══════════════════════════════════════════
   QUIZ SCREEN
══════════════════════════════════════════ */
#screen-quiz {
  background:
    radial-gradient(ellipse 70% 50% at 50% 0%, rgba(30,58,138,0.1) 0%, transparent 60%),
    var(--bg-base);
  display: flex; flex-direction: column; min-height: 100vh;
}

.quiz-header {
  background: rgba(10,15,30,0.9); backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 0 24px; height: 64px;
  display: flex; align-items: center;
  position: sticky; top: 0; z-index: 50;
}

.quiz-header-left {
  display: flex; align-items: center; gap: 14px; flex-shrink: 0;
}
.quiz-header-center {
  position: absolute; left: 50%; transform: translateX(-50%);
  width: 340px; max-width: calc(100% - 320px);
  display: flex; flex-direction: column; gap: 5px; align-items: center;
  pointer-events: none;
}
.quiz-header-right { flex-shrink: 0; margin-left: auto; }

.btn-quit {
  display: flex; align-items: center; gap: 6px;
  background: transparent; border: 1px solid var(--border);
  color: var(--text-muted); cursor: pointer;
  font-size: 0.8rem; padding: 6px 12px; border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.btn-quit:hover { border-color: var(--red-500); color: var(--red-400); }
.quiz-title { font-size: 0.9rem; font-weight: 600; color: var(--text-secondary); }

.progress-info { font-size: 0.8rem; color: var(--text-muted); }

.progress-bar-wrapper {
  width: 100%; height: 5px;
  background: var(--bg-input); border-radius: 999px; overflow: hidden;
}
.progress-bar {
  height: 100%; background: linear-gradient(90deg, var(--blue-600), var(--blue-400));
  border-radius: 999px; transition: width .4s ease;
}

.timer-display {
  display: flex; align-items: center; gap: 6px;
  font-family: var(--font-mono); font-size: 1rem; font-weight: 600;
  color: var(--text-primary);
  background: var(--bg-card); border: 1px solid var(--border);
  padding: 6px 14px; border-radius: var(--radius);
}
.timer-display.warning { color: var(--amber-400); border-color: var(--amber-500); }
.timer-display.danger  { color: var(--red-400); border-color: var(--red-500); animation: pulse 1s infinite; }

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

/* ── Quiz Body ── */
.quiz-body {
  flex: 1; display: flex; justify-content: center;
  width: 100%;
  padding: 24px; gap: 24px;
}

/* ── Sidebar ── */
.quiz-sidebar {
  display: none;
}

.sidebar-label { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.8px; color: var(--text-muted); }

.question-nav {
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 5px;
}

.nav-btn {
  width: 100%; aspect-ratio: 1; border-radius: var(--radius-sm);
  background: var(--bg-card); border: 1px solid var(--border);
  color: var(--text-muted); cursor: pointer; font-size: 0.75rem; font-weight: 500;
  transition: all var(--transition);
  display: flex; align-items: center; justify-content: center;
}
.nav-btn:hover  { border-color: var(--blue-500); color: var(--blue-400); }
.nav-btn.current  { background: var(--blue-800); border-color: var(--blue-500); color: var(--blue-300); font-weight: 700; }
.nav-btn.answered { background: rgba(34,197,94,0.12); border-color: var(--green-500); color: var(--green-400); }
.nav-btn.flagged  { background: rgba(245,158,11,0.12); border-color: var(--amber-500); color: var(--amber-400); }
.nav-btn.answered.flagged {
  background: rgba(245,158,11,0.12); border-color: var(--amber-500); color: var(--amber-400);
}

.sidebar-legend { display: flex; flex-direction: column; gap: 6px; }
.legend-item { display: flex; align-items: center; gap: 7px; font-size: 0.72rem; color: var(--text-muted); }
.nav-dot { width: 10px; height: 10px; border-radius: 3px; flex-shrink: 0; }
.nav-dot--current  { background: var(--blue-600); border: 1px solid var(--blue-400); }
.nav-dot--answered { background: rgba(34,197,94,0.3); border: 1px solid var(--green-500); }
.nav-dot--flagged  { background: rgba(245,158,11,0.3); border: 1px solid var(--amber-500); }
.nav-dot--empty    { background: var(--bg-card); border: 1px solid var(--border); }

/* ── Quiz Content ── */
.quiz-content { width: 100%; max-width: 860px; min-width: 0; }

.question-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-xl); padding: 36px 40px;
  box-shadow: var(--shadow-lg);
}

.question-meta {
  display: flex; align-items: center; gap: 12px; margin-bottom: 24px;
}
.question-number { font-size: 0.8rem; color: var(--text-muted); }
.question-topic {
  background: rgba(59,130,246,0.12); border: 1px solid rgba(59,130,246,0.25);
  color: var(--blue-400); font-size: 0.72rem; font-weight: 500;
  padding: 3px 10px; border-radius: 999px;
}
.btn-flag {
  margin-left: auto; display: flex; align-items: center; gap: 5px;
  background: transparent; border: 1px solid var(--border);
  color: var(--text-muted); cursor: pointer; font-size: 0.78rem;
  padding: 5px 12px; border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.btn-flag:hover { border-color: var(--amber-500); color: var(--amber-400); }
.btn-flag.flagged { background: var(--amber-bg); border-color: var(--amber-500); color: var(--amber-400); }

.question-body { margin-bottom: 28px; }
.question-text { font-size: 1.1rem; line-height: 1.7; color: var(--text-primary); font-weight: 400; }

/* ── Options ── */
.options-list { display: flex; flex-direction: column; gap: 10px; margin-bottom: 32px; }

.option-btn {
  width: 100%; display: flex; align-items: flex-start; gap: 14px;
  background: var(--bg-input); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 14px 18px;
  cursor: pointer; text-align: left; color: var(--text-secondary);
  font-size: 0.95rem; line-height: 1.5;
  transition: all var(--transition);
}
.option-btn:hover:not(:disabled) {
  background: var(--bg-card-hover); border-color: var(--blue-500);
  color: var(--text-primary);
}
.option-btn:disabled { cursor: default; }

.option-letter {
  width: 28px; height: 28px; flex-shrink: 0;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.8rem; font-weight: 600; color: var(--text-muted);
  transition: all var(--transition);
}

.option-btn.selected {
  background: rgba(37,99,235,0.12); border-color: var(--blue-500);
  color: var(--text-primary);
}
.option-btn.selected .option-letter {
  background: var(--blue-700); border-color: var(--blue-500); color: #fff;
}

.option-btn:hover:not(:disabled) .option-letter {
  background: var(--blue-900); border-color: var(--blue-600); color: var(--blue-300);
}

/* ── Navigation Buttons ── */
.question-nav-buttons {
  display: flex; align-items: center; gap: 12px; padding-top: 20px;
  border-top: 1px solid var(--border);
}

.btn-nav {
  display: flex; align-items: center; gap: 6px;
  background: var(--bg-input); border: 1px solid var(--border);
  color: var(--text-secondary); cursor: pointer;
  font-size: 0.9rem; padding: 10px 22px; border-radius: var(--radius);
  transition: all var(--transition); font-weight: 500;
}
.btn-nav:hover { border-color: var(--blue-500); color: var(--blue-400); }
.btn-nav:disabled { opacity: 0.4; cursor: not-allowed; }

.btn-next { margin-left: auto; }

.btn-submit-quiz {
  display: flex; align-items: center; gap: 8px;
  background: linear-gradient(135deg, var(--green-600), #15803d);
  border: none; color: #fff; cursor: pointer;
  font-size: 0.95rem; font-weight: 600;
  padding: 10px 24px; border-radius: var(--radius);
  transition: all var(--transition);
  box-shadow: 0 4px 16px rgba(22,163,74,0.3);
}
.btn-submit-quiz:hover { box-shadow: 0 4px 20px rgba(22,163,74,0.5); transform: translateY(-1px); }

/* ── Modals ── */
.modal-backdrop {
  position: fixed; inset: 0; z-index: 300;
  background: rgba(0,0,0,0.6); backdrop-filter: blur(4px);
  display: flex; align-items: center; justify-content: center; padding: 24px;
}
.modal-backdrop.hidden { display: none !important; }

.modal {
  background: var(--bg-surface); border: 1px solid var(--border);
  border-radius: var(--radius-xl); padding: 36px 40px;
  max-width: 440px; width: 100%; text-align: center;
  box-shadow: var(--shadow-lg);
  animation: modal-in .2s ease;
}
@keyframes modal-in {
  from { transform: scale(0.92); opacity: 0; }
  to   { transform: scale(1);    opacity: 1; }
}

.modal-icon { font-size: 2.5rem; margin-bottom: 14px; }
.modal h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 10px; }
.modal p  { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 8px; }
.modal-warn { color: var(--amber-400) !important; }

/* Modal score preview */
.modal-score-preview { margin: 14px 0 6px; }
.mscore-box {
  border-radius: var(--radius); padding: 16px 20px; margin-bottom: 4px;
  text-align: center;
}
.mscore-box.pass { background: rgba(22,163,74,0.12); border: 1px solid rgba(22,163,74,0.4); }
.mscore-box.fail { background: rgba(239,68,68,0.10); border: 1px solid rgba(239,68,68,0.35); }
.mscore-num {
  font-size: 2.2rem; font-weight: 800; line-height: 1;
  font-family: var(--font-mono);
}
.mscore-box.pass .mscore-num { color: var(--green-400); }
.mscore-box.fail .mscore-num { color: var(--red-400); }
.mscore-num span { font-size: 1rem; opacity: 0.7; }
.mscore-verdict {
  font-size: 1rem; font-weight: 700; letter-spacing: 0.08em;
  margin: 6px 0 4px;
}
.mscore-box.pass .mscore-verdict { color: var(--green-400); }
.mscore-box.fail .mscore-verdict { color: var(--red-400); }
.mscore-detail { font-size: 0.82rem; color: var(--text-secondary); }

.modal-buttons { display: flex; gap: 12px; justify-content: center; margin-top: 24px; }

/* ══════════════════════════════════════════
   RESULTS SCREEN
══════════════════════════════════════════ */
#screen-results { background: var(--bg-base); }

.results-header {
  background: rgba(10,15,30,0.9); backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 16px 24px; position: sticky; top: 0; z-index: 50;
}
.results-header-inner {
  max-width: 1100px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
}
.results-logo { display: flex; align-items: center; gap: 10px; font-weight: 600; color: var(--text-secondary); }

.results-body { max-width: 1100px; margin: 0 auto; padding: 36px 24px 80px; display: flex; flex-direction: column; gap: 40px; }

/* ── Score Card ── */
.score-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-xl); padding: 36px 40px;
  display: flex; gap: 40px; align-items: center; flex-wrap: wrap;
}

.score-badge { display: flex; align-items: center; gap: 32px; flex-wrap: wrap; }

.score-circle {
  position: relative; width: 130px; height: 130px; flex-shrink: 0;
}
.score-ring { width: 130px; height: 130px; transform: rotate(-90deg); }
.ring-bg { fill: none; stroke: var(--bg-input); stroke-width: 10; }
.ring-fg {
  fill: none; stroke: var(--blue-500); stroke-width: 10;
  stroke-linecap: round;
  transition: stroke-dasharray 1.2s ease, stroke .3s;
  stroke-dasharray: 0 327;
}
.ring-fg.pass { stroke: var(--green-500); }
.ring-fg.fail { stroke: var(--red-500); }

.score-inner {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
}
.score-pct { font-size: 1.6rem; font-weight: 800; font-family: var(--font-mono); line-height: 1; }
.score-label { font-size: 0.7rem; color: var(--text-muted); }

.score-verdict { display: flex; flex-direction: column; gap: 6px; }
.verdict-icon { font-size: 2.4rem; line-height: 1; }
.verdict-text { font-size: 1.6rem; font-weight: 800; line-height: 1.1; }
.verdict-text.pass { color: var(--green-400); }
.verdict-text.fail { color: var(--red-400); }
.verdict-sub { font-size: 0.9rem; color: var(--text-secondary); }

.score-stats { display: flex; gap: 20px; flex-wrap: wrap; margin-left: auto; }

.score-stat {
  text-align: center; min-width: 80px;
  background: var(--bg-input); border-radius: var(--radius); padding: 14px 20px;
}
.score-stat--correct { border: 1px solid rgba(34,197,94,0.3); }
.score-stat--wrong   { border: 1px solid rgba(239,68,68,0.3); }
.score-stat--blank   { border: 1px solid var(--border); }
.score-stat--time    { border: 1px solid rgba(59,130,246,0.3); }

.ss-value { font-size: 1.8rem; font-weight: 800; font-family: var(--font-mono); }
.score-stat--correct .ss-value { color: var(--green-400); }
.score-stat--wrong   .ss-value { color: var(--red-400); }
.score-stat--blank   .ss-value { color: var(--text-muted); }
.score-stat--time    .ss-value { color: var(--blue-400); font-size: 1.4rem; }
.ss-label { font-size: 0.75rem; color: var(--text-muted); margin-top: 4px; }

/* ── Topic Breakdown ── */
.results-section { display: flex; flex-direction: column; gap: 20px; }
.section-title { font-size: 1.1rem; font-weight: 700; color: var(--text-primary); }
.section-header-row { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; }

.topic-breakdown { display: flex; flex-direction: column; gap: 12px; }

.topic-row {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 14px 18px;
  display: flex; align-items: center; gap: 16px;
}
.topic-name { font-size: 0.88rem; font-weight: 500; color: var(--text-secondary); min-width: 200px; }
.topic-bar-wrap { flex: 1; height: 8px; background: var(--bg-input); border-radius: 999px; overflow: hidden; }
.topic-bar { height: 100%; border-radius: 999px; transition: width 1s ease; }
.topic-bar.good { background: linear-gradient(90deg, var(--green-600), var(--green-400)); }
.topic-bar.mid  { background: linear-gradient(90deg, var(--amber-500), var(--amber-400)); }
.topic-bar.bad  { background: linear-gradient(90deg, var(--red-600), var(--red-400)); }
.topic-score { font-size: 0.85rem; font-weight: 600; font-family: var(--font-mono); min-width: 60px; text-align: right; }
.topic-score.good { color: var(--green-400); }
.topic-score.mid  { color: var(--amber-400); }
.topic-score.bad  { color: var(--red-400); }

/* ── Review Section ── */
.review-filter { display: flex; gap: 8px; flex-wrap: wrap; }
.filter-btn {
  background: var(--bg-card); border: 1px solid var(--border);
  color: var(--text-muted); cursor: pointer;
  font-size: 0.78rem; padding: 5px 14px; border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.filter-btn:hover { border-color: var(--blue-500); color: var(--blue-400); }
.filter-btn.active { background: rgba(37,99,235,0.15); border-color: var(--blue-500); color: var(--blue-400); }

.review-list { display: flex; flex-direction: column; gap: 14px; }

.review-item {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); overflow: hidden;
}
.review-item.correct { border-left: 4px solid var(--green-500); }
.review-item.wrong   { border-left: 4px solid var(--red-500); }
.review-item.blank   { border-left: 4px solid var(--text-dim); }

.review-item-header {
  padding: 14px 20px; cursor: pointer;
  display: flex; align-items: flex-start; gap: 14px;
  transition: background var(--transition);
}
.review-item-header:hover { background: var(--bg-card-hover); }

.review-status-icon {
  width: 26px; height: 26px; border-radius: 50%; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.75rem; font-weight: 700; margin-top: 2px;
}
.correct .review-status-icon { background: var(--green-bg); color: var(--green-400); }
.wrong   .review-status-icon { background: var(--red-bg);   color: var(--red-400); }
.blank   .review-status-icon { background: var(--bg-input); color: var(--text-muted); }

.review-q-meta { flex: 1; }
.review-q-num  { font-size: 0.72rem; color: var(--text-muted); }
.review-q-text { font-size: 0.9rem; color: var(--text-primary); margin-top: 3px; line-height: 1.4; }

.review-chevron { color: var(--text-muted); font-size: 0.8rem; transition: transform .2s; margin-top: 4px; flex-shrink: 0; }
.review-item.open .review-chevron { transform: rotate(180deg); }

.review-item-body {
  display: none; padding: 16px 20px 20px;
  border-top: 1px solid var(--border);
  background: rgba(0,0,0,0.15);
}
.review-item.open .review-item-body { display: block; }

.review-options { display: flex; flex-direction: column; gap: 8px; margin-bottom: 14px; }
.review-opt {
  display: flex; align-items: flex-start; gap: 10px;
  padding: 9px 14px; border-radius: var(--radius-sm); border: 1px solid transparent;
  font-size: 0.87rem; line-height: 1.5;
}
.review-opt.is-correct { background: var(--green-bg); border-color: rgba(34,197,94,0.3); color: var(--green-400); }
.review-opt.is-selected-wrong { background: var(--red-bg); border-color: rgba(239,68,68,0.3); color: var(--red-400); }
.review-opt.plain { color: var(--text-muted); }
.review-opt-letter {
  width: 22px; height: 22px; flex-shrink: 0; border-radius: 4px;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.72rem; font-weight: 700;
  background: var(--bg-input);
}
.review-opt.is-correct     .review-opt-letter { background: var(--green-600); color: #fff; }
.review-opt.is-selected-wrong .review-opt-letter { background: var(--red-600); color: #fff; }

.review-explanation {
  background: rgba(59,130,246,0.06); border: 1px solid rgba(59,130,246,0.2);
  border-radius: var(--radius-sm); padding: 12px 16px;
  font-size: 0.85rem; color: var(--text-secondary); line-height: 1.6;
}
.review-explanation-label { font-weight: 600; color: var(--blue-400); font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 4px; }

/* ══════════════════════════════════════════
   CONFIRM SCREEN
══════════════════════════════════════════ */
.confirm-main {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 24px;
  background: var(--bg);
}

.confirm-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 48px 44px;
  max-width: 560px;
  width: 100%;
  text-align: center;
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.45);
  animation: fadeSlideUp 0.28s ease;
}

@keyframes fadeSlideUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

.confirm-icon { font-size: 3rem; margin-bottom: 20px; line-height: 1; }

.confirm-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
  letter-spacing: -0.5px;
}

.confirm-subtitle {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 32px;
}

.confirm-info-cards {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 36px;
  text-align: left;
}

.confirm-actions {
  display: flex;
  gap: 12px;
}

.confirm-actions .btn-secondary,
.confirm-actions .btn-primary {
  flex: 1;
  justify-content: center;
}

/* ══════════════════════════════════════════
   RESPONSIVE — Tablet (≤ 900px)
══════════════════════════════════════════ */
@media (max-width: 900px) {
  .quiz-sidebar { display: none; }
  .question-card { padding: 24px 28px; }
  .results-body { padding: 20px 16px 60px; }
  .score-card { flex-direction: column; align-items: flex-start; gap: 24px; }
  .score-stats { margin-left: 0; width: 100%; justify-content: space-between; }
  .topic-name { min-width: 140px; }
}

/* ══════════════════════════════════════════
   RESPONSIVE — Mobile (≤ 768px)
══════════════════════════════════════════ */
@media (max-width: 768px) {
  /* Welcome */
  .welcome-main { padding: 48px 16px 40px; }
  .hero-title { font-size: clamp(1.6rem, 6vw, 2.2rem); letter-spacing: -0.5px; }
  .hero-subtitle { font-size: 0.95rem; }

  .stats-row { gap: 10px; }
  .stat-card { min-width: 80px; padding: 14px 16px; flex: 1; }
  .stat-number { font-size: 1.6rem; }

  .welcome-actions { flex-direction: column; align-items: stretch; }
  .welcome-actions .btn-primary,
  .welcome-actions .btn-secondary { justify-content: center; width: 100%; }

  .exam-info-cards { flex-direction: column; }
  .info-card { width: 100%; }

  /* Quiz header - 2 rows: [quit + title + timer] / [progress bar] */
  .quiz-header { height: auto; padding: 8px 12px; flex-wrap: wrap; gap: 6px; position: relative; }
  .quiz-header-left { flex-shrink: 0; }
  .quiz-header-center { position: static; left: auto; transform: none; max-width: 100%; width: 100%; order: 3; pointer-events: auto; padding-top: 2px; }
  .quiz-header-right { order: 2; margin-left: auto; }
  .quiz-title { font-size: 0.78rem; }

  /* Quiz screen fills viewport; body scrolls internally */
  #screen-quiz { height: 100dvh; overflow: hidden; }
  .quiz-body { flex: 1; overflow-y: auto; min-height: 0; padding: 12px; }
  .question-card { padding: 18px 16px; border-radius: var(--radius-lg); }
  .question-text { font-size: 1rem; }
  .option-btn { font-size: 0.9rem; padding: 12px 14px; gap: 10px; }

  /* Nav buttons */
  .question-nav-buttons { flex-wrap: nowrap; gap: 8px; }
  .btn-nav { flex: 1; justify-content: center; min-width: 0; padding: 10px 10px; font-size: 0.82rem; }
  .btn-next { margin-left: 0; }
  .btn-submit-quiz { flex: 1; width: auto; justify-content: center; padding: 10px 10px; font-size: 0.82rem; }

  /* Results */
  .results-header { padding: 12px 16px; }
  .results-header-inner { flex-direction: column; align-items: flex-start; gap: 10px; }
  .results-body { padding: 16px 12px 60px; gap: 28px; }

  .score-card { padding: 20px 16px; }
  .score-badge { gap: 16px; }
  .score-stats {
    display: grid; grid-template-columns: 1fr 1fr;
    gap: 10px; width: 100%;
  }
  .score-stat { min-width: unset; }
  .ss-value { font-size: 1.5rem; }

  .topic-row { flex-wrap: wrap; gap: 8px; }
  .topic-name { min-width: 100%; font-size: 0.82rem; }
  .topic-score { min-width: unset; margin-left: auto; }

  .section-header-row { flex-direction: column; align-items: flex-start; }
  .review-filter { gap: 6px; }
  .filter-btn { font-size: 0.72rem; padding: 5px 11px; }

  .review-item-header { padding: 12px 14px; gap: 10px; }
  .review-item-body { padding: 12px 14px 16px; }

  /* Modal */
  .modal { padding: 24px 20px; }
  .modal-buttons { flex-direction: column; }
  .modal-buttons .btn-primary,
  .modal-buttons .btn-secondary,
  .modal-buttons .btn-danger { width: 100%; justify-content: center; }
  /* Confirm screen */
  .confirm-card { padding: 32px 24px; }
  .confirm-actions { flex-direction: column; }
  .confirm-title { font-size: 1.4rem; }
}

/* ══════════════════════════════════════════
   RESPONSIVE — Small Mobile (≤ 480px)
══════════════════════════════════════════ */
@media (max-width: 480px) {
  .hero-title { font-size: 1.5rem; }
  .hero-subtitle { font-size: 0.88rem; }

  .stats-row { flex-wrap: nowrap; }
  .stat-card { padding: 12px 10px; }
  .stat-number { font-size: 1.4rem; }
  .stat-label { font-size: 0.68rem; }

  .question-card { padding: 14px 12px; }
  .question-meta { flex-wrap: wrap; gap: 8px; }
  .btn-flag { width: 100%; justify-content: center; }

  .option-btn { font-size: 0.87rem; padding: 10px 12px; }
  .option-letter { width: 24px; height: 24px; font-size: 0.75rem; }

  .timer-display { font-size: 0.88rem; padding: 5px 10px; }
  .btn-quit { font-size: 0.75rem; padding: 5px 9px; }
  .quiz-title { font-size: 0.72rem; }

  .score-circle { width: 100px; height: 100px; }
  .score-ring { width: 100px; height: 100px; }
  .score-pct { font-size: 1.3rem; }
  .verdict-text { font-size: 1.3rem; }

  .score-stats { grid-template-columns: 1fr 1fr; gap: 8px; }
  .ss-value { font-size: 1.3rem; }

  .review-q-text { font-size: 0.85rem; }
  .review-opt { font-size: 0.82rem; }

  .mscore-num { font-size: 1.8rem; }
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-base); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-light); }

/* ── Selection ── */
::selection { background: rgba(59,130,246,0.3); }