/* ==========================================================================
   Google Cloud Certified - Professional Data Engineer Exam Simulator CSS
   ========================================================================== */

:root {
  --primary-blue: #1a73e8;
  --primary-blue-hover: #1557b0;
  --primary-blue-light: #e8f0fe;
  --primary-blue-border: #aecbfa;
  
  --google-red: #d93025;
  --google-red-light: #fce8e6;
  --google-green: #1e8e3e;
  --google-green-light: #e6f4ea;
  --google-yellow: #f9ab00;
  --google-yellow-light: #fef7e0;
  
  --bg-main: #f8fafd;
  --bg-card: #ffffff;
  --bg-subbar: #ffffff;
  --header-bg: #1e293b;
  --header-text: #f8fafc;
  
  --text-main: #202124;
  --text-secondary: #5f6368;
  --text-muted: #80868b;
  --border-color: #dadce0;
  --border-light: #e8eaed;
  
  --font-base: 16px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(60, 64, 67, 0.08), 0 1px 2px rgba(60, 64, 67, 0.12);
  --shadow-md: 0 4px 12px rgba(60, 64, 67, 0.1);
  --shadow-lg: 0 12px 28px rgba(60, 64, 67, 0.15);
  
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  max-width: 100%;
  overflow-x: hidden;
  position: relative;
}

body {
  font-family: 'Google Sans', 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: var(--font-base);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ==========================================================================
   Header: Kryterion / Google Cloud Authentic Exam Bar
   ========================================================================== */

.exam-header {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  color: var(--header-text);
  padding: 10px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.25);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 2px solid #3b82f6;
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: transform;
}

.exam-header.header-hidden {
  transform: translateY(-100%);
  box-shadow: none;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.gcp-logo-container {
  display: flex;
  align-items: center;
  gap: 12px;
}

.gcp-cloud-icon {
  width: 34px;
  height: 34px;
  filter: drop-shadow(0 2px 4px rgba(66, 133, 244, 0.4));
}

.exam-title-wrapper {
  display: flex;
  flex-direction: column;
}

.exam-org {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: #94a3b8;
  font-weight: 500;
}

.exam-name {
  font-size: 17px;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: -0.2px;
}

.mode-badge {
  font-size: 12px;
  padding: 4px 10px;
  background: rgba(59, 130, 246, 0.2);
  border: 1px solid rgba(147, 197, 253, 0.4);
  color: #93c5fd;
  border-radius: 20px;
  font-weight: 500;
}

.header-center {
  flex: 1;
  max-width: 320px;
  margin: 0 24px;
}

.progress-info {
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-items: center;
}

.q-counter {
  font-size: 13px;
  font-weight: 600;
  color: #cbd5e1;
}

.progress-bar-container {
  width: 100%;
  height: 7px;
  background: #334155;
  border-radius: 10px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #38bdf8, #3b82f6);
  border-radius: 10px;
  transition: width 0.3s ease;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.timer-box {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid #334155;
  padding: 6px 14px;
  border-radius: 8px;
  font-family: 'JetBrains Mono', monospace;
}

.timer-box.warning {
  background: rgba(220, 38, 38, 0.25);
  border-color: #ef4444;
  color: #fca5a5;
  animation: pulse 1s infinite alternate;
}

@keyframes pulse {
  0% { transform: scale(1); }
  100% { transform: scale(1.03); }
}

.icon-clock {
  color: #60a5fa;
}

.timer-label {
  font-size: 12px;
  color: #94a3b8;
}

.timer-display {
  font-size: 15px;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: 0.5px;
}

.mark-review-label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  background: rgba(255, 255, 255, 0.08);
  padding: 6px 14px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  transition: all var(--transition-fast);
  user-select: none;
}

.mark-review-label:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: #facc15;
}

.mark-review-label.checked {
  background: rgba(245, 158, 11, 0.25);
  border-color: #f59e0b;
  color: #fef08a;
}

.mark-review-label input {
  display: none;
}

.flag-icon {
  display: flex;
  align-items: center;
  color: #94a3b8;
  transition: color var(--transition-fast);
}

.mark-review-label.checked .flag-icon {
  color: #f59e0b;
}

.mark-text {
  font-size: 13px;
  font-weight: 600;
}

/* ==========================================================================
   Exam Sub-bar (Tools & Controls)
   ========================================================================== */

.exam-subbar {
  background: var(--bg-subbar);
  padding: 10px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 1px 4px rgba(0,0,0,0.03);
  gap: 16px;
  flex-wrap: wrap;
}

.subbar-left, .subbar-right {
  display: flex;
  align-items: center;
  gap: 14px;
}

.styled-select {
  padding: 6px 12px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: #ffffff;
  font-size: 13px;
  color: var(--text-main);
  outline: none;
  cursor: pointer;
  transition: border-color var(--transition-fast);
}

.styled-select:focus {
  border-color: var(--primary-blue);
  box-shadow: 0 0 0 2px var(--primary-blue-light);
}

.search-box {
  display: flex;
  align-items: center;
  gap: 6px;
  background: #f1f3f4;
  border-radius: 20px;
  padding: 5px 12px;
  color: var(--text-secondary);
}

.search-box input {
  border: none;
  background: transparent;
  outline: none;
  font-size: 13px;
  width: 180px;
  color: var(--text-main);
}

.toggle-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: #f8fafd;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 13px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.toggle-btn:hover {
  background: #f1f3f4;
}

.font-size-group {
  display: flex;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.font-size-group button {
  padding: 5px 10px;
  border: none;
  background: #ffffff;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  color: var(--text-secondary);
  transition: background var(--transition-fast);
}

.font-size-group button:hover {
  background: #f1f3f4;
  color: var(--text-main);
}

/* ==========================================================================
   Exam Viewport & Main Content
   ========================================================================== */

.exam-viewport {
  flex: 1;
  max-width: 1040px;
  width: 100%;
  margin: 24px auto 90px auto;
  padding: 0 20px;
}

.question-container {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.question-meta-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  box-shadow: var(--shadow-sm);
}

.q-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 14px;
  margin-bottom: 18px;
  flex-wrap: wrap;
  gap: 10px;
}

.q-badge-group {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.q-id-badge {
  font-size: 14px;
  font-weight: 700;
  color: var(--primary-blue);
  background: var(--primary-blue-light);
  padding: 4px 10px;
  border-radius: 4px;
}

.q-type-badge {
  font-size: 12px;
  font-weight: 600;
  color: #475569;
  background: #f1f5f9;
  padding: 4px 8px;
  border-radius: 4px;
}

.q-tags-badge {
  font-size: 12px;
  font-weight: 500;
  color: #0369a1;
  background: #e0f2fe;
  padding: 4px 8px;
  border-radius: 4px;
}

.q-instruction {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  background: #f8fafc;
  padding: 4px 10px;
  border-radius: 4px;
  border-left: 3px solid var(--primary-blue);
}

.question-text {
  font-size: 1.05rem;
  line-height: 1.75;
  color: #1e293b;
  font-weight: 450;
  white-space: pre-line;
}

/* Highlight mark tag style */
mark {
  background-color: #fef08a;
  color: #854d0e;
  padding: 1px 4px;
  border-radius: 3px;
  font-weight: 500;
}

body.hide-highlights mark {
  background-color: transparent !important;
  color: inherit !important;
  padding: 0 !important;
  font-weight: inherit !important;
}

/* ==========================================================================
   Options Container
   ========================================================================== */

.options-container {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.option-card {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 16px 20px;
  background: var(--bg-card);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
}

.option-card:hover {
  border-color: var(--primary-blue);
  background-color: #f8fafd;
  transform: translateY(-1px);
  box-shadow: 0 3px 8px rgba(0, 0, 0, 0.05);
}

.option-card.selected {
  border-color: var(--primary-blue);
  background-color: var(--primary-blue-light);
  box-shadow: 0 0 0 1px var(--primary-blue);
}

/* Option Letter Badge & Radio/Checkbox */
.opt-indicator {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  min-width: 32px;
  border-radius: 50%;
  background: #f1f5f9;
  border: 1.5px solid #cbd5e1;
  font-weight: 700;
  font-size: 14px;
  color: #475569;
  transition: all var(--transition-fast);
}

.option-card.multi .opt-indicator {
  border-radius: 6px;
}

.option-card.selected .opt-indicator {
  background: var(--primary-blue);
  border-color: var(--primary-blue);
  color: #ffffff;
}

.opt-text {
  flex: 1;
  font-size: 1rem;
  line-height: 1.6;
  color: #334155;
  padding-top: 3px;
}

/* Reveal styles in study mode or after submit */
.option-card.is-correct {
  border-color: var(--google-green) !important;
  background-color: var(--google-green-light) !important;
}

.option-card.is-correct .opt-indicator {
  background: var(--google-green) !important;
  border-color: var(--google-green) !important;
  color: #ffffff !important;
}

.option-card.is-wrong-selected {
  border-color: var(--google-red) !important;
  background-color: var(--google-red-light) !important;
}

.option-card.is-wrong-selected .opt-indicator {
  background: var(--google-red) !important;
  border-color: var(--google-red) !important;
  color: #ffffff !important;
}

.correct-badge {
  font-size: 12px;
  font-weight: 700;
  color: var(--google-green);
  background: #ffffff;
  padding: 2px 8px;
  border-radius: 12px;
  border: 1px solid var(--google-green);
  margin-left: auto;
}

/* ==========================================================================
   Explanation Container
   ========================================================================== */

.explanation-container {
  margin-top: 10px;
}

.explanation-card {
  background: #ffffff;
  border: 1.5px solid #cbd5e1;
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  border-left: 5px solid #3b82f6;
}

.exp-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid #e2e8f0;
  padding-bottom: 12px;
  margin-bottom: 16px;
}

.exp-title {
  display: flex;
  align-items: center;
  gap: 8px;
}

.exp-title h3 {
  font-size: 16px;
  font-weight: 700;
  color: #1e293b;
}

.exp-answer-badge {
  font-size: 15px;
  font-weight: 700;
  color: #15803d;
  background: #dcfce7;
  padding: 4px 14px;
  border-radius: 20px;
  border: 1px solid #bbf7d0;
}

.exp-tabs {
  display: flex;
  gap: 8px;
  border-bottom: 1px solid #e2e8f0;
  padding-bottom: 8px;
  margin-bottom: 14px;
  overflow-x: auto;
}

.exp-tab {
  padding: 6px 14px;
  border: none;
  background: #f1f5f9;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  color: #475569;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.exp-tab:hover {
  background: #e2e8f0;
}

.exp-tab.active {
  background: #2563eb;
  color: #ffffff;
}

.exp-tab-content {
  display: none;
  font-size: 14.5px;
  line-height: 1.7;
  color: #334155;
  white-space: pre-line;
  padding: 6px 4px;
}

.exp-tab-content.active {
  display: block;
}

.exp-link {
  display: inline-block;
  margin-top: 6px;
  color: #2563eb;
  text-decoration: none;
  word-break: break-all;
}

.exp-link:hover {
  text-decoration: underline;
}

/* ==========================================================================
   Review Screen (Item Review Grid)
   ========================================================================== */

.review-screen-container {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}

.review-screen-header h2 {
  font-size: 20px;
  font-weight: 700;
  color: #1e293b;
  margin-bottom: 6px;
}

.review-desc {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.review-summary-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
  margin-bottom: 20px;
}

.summary-card {
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  background: #f8fafc;
  border: 1.5px solid #e2e8f0;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.summary-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.summary-card .card-num {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 4px;
}

.summary-card .card-lbl {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
}

.summary-card.all .card-num { color: #1e293b; }
.summary-card.answered .card-num { color: #15803d; }
.summary-card.unanswered .card-num { color: #b91c1c; }
.summary-card.flagged .card-num { color: #b45309; }

.review-filter-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
  border-bottom: 1px solid #e2e8f0;
  padding-bottom: 10px;
}

.rf-tab {
  padding: 6px 14px;
  border: none;
  background: #f1f5f9;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  color: #475569;
  cursor: pointer;
}

.rf-tab.active {
  background: #1e293b;
  color: #ffffff;
}

.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 10px;
}

.review-item-card {
  background: #ffffff;
  border: 1.5px solid #cbd5e1;
  border-radius: 8px;
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
}

.review-item-card:hover {
  border-color: #2563eb;
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.review-item-card.is-current {
  border-color: #2563eb;
  background-color: #eff6ff;
}

.ric-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.ric-num {
  font-size: 13px;
  font-weight: 700;
  color: #1e293b;
}

.ric-flag {
  color: #f59e0b;
  font-size: 14px;
}

.ric-status {
  font-size: 11px;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: 4px;
  text-align: center;
}

.ric-status.answered {
  background: #dcfce7;
  color: #15803d;
}

.ric-status.unanswered {
  background: #fee2e2;
  color: #991b1b;
}

.ric-choice {
  font-size: 11px;
  color: #64748b;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ==========================================================================
   Result Screen & Diagnostic Report
   ========================================================================== */

.result-screen-container {
  max-width: 900px;
  margin: 0 auto;
}

.result-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-md);
  text-align: center;
}

.result-status-banner {
  padding: 24px;
  border-radius: var(--radius-md);
  margin-bottom: 28px;
}

.result-status-banner.pass {
  background: linear-gradient(135deg, #ecfdf5 0%, #d1fae5 100%);
  border: 1.5px solid #6ee7b7;
}

.result-status-banner.fail {
  background: linear-gradient(135deg, #fef2f2 0%, #fee2e2 100%);
  border: 1.5px solid #fca5a5;
}

.pass-fail-badge {
  display: inline-block;
  padding: 6px 22px;
  border-radius: 30px;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 1.5px;
  margin-bottom: 12px;
}

.pass .pass-fail-badge {
  background: #059669;
  color: #ffffff;
}

.fail .pass-fail-badge {
  background: #dc2626;
  color: #ffffff;
}

.result-status-banner h2 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 6px;
  color: #0f172a;
}

.result-status-banner p {
  font-size: 14px;
  color: #475569;
}

.score-metrics-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 32px;
}

.metric-box {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.metric-box .m-val {
  font-size: 32px;
  font-weight: 800;
  color: #1e293b;
}

.metric-box .m-lbl {
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 500;
}

.topic-breakdown-section {
  text-align: left;
  margin-bottom: 36px;
}

.topic-breakdown-section h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 16px;
  color: #1e293b;
  border-bottom: 1px solid #e2e8f0;
  padding-bottom: 8px;
}

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

.topic-bar-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.tbr-info {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  font-weight: 600;
  color: #334155;
}

.tbr-progress-track {
  height: 8px;
  background: #e2e8f0;
  border-radius: 6px;
  overflow: hidden;
}

.tbr-progress-fill {
  height: 100%;
  border-radius: 6px;
  transition: width 0.6s ease;
}

.tbr-progress-fill.high { background: #10b981; }
.tbr-progress-fill.mid { background: #f59e0b; }
.tbr-progress-fill.low { background: #ef4444; }

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

/* ==========================================================================
   Sticky Bottom Action Bar
   ========================================================================== */

.exam-footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: #ffffff;
  border-top: 1px solid var(--border-color);
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.06);
  z-index: 99;
}

.footer-left, .footer-right, .footer-center {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  border: 1.5px solid var(--border-color);
  background: #ffffff;
  color: var(--text-main);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.nav-btn:hover:not(:disabled) {
  border-color: var(--primary-blue);
  background: #f8fafd;
}

.nav-btn.primary {
  background: var(--primary-blue);
  color: #ffffff;
  border-color: var(--primary-blue);
}

.nav-btn.primary:hover:not(:disabled) {
  background: var(--primary-blue-hover);
}

.nav-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.footer-action-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border: 1px solid var(--border-color);
  background: #f8fafc;
  color: #334155;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.footer-action-btn:hover {
  background: #e2e8f0;
}

.btn-hint {
  color: #b45309;
  background: #fef3c7;
  border-color: #fde68a;
}

.btn-hint:hover {
  background: #fde68a;
}

.finish-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  border: none;
  background: #d93025;
  color: #ffffff;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.finish-btn:hover {
  background: #b3261e;
}

/* Common Buttons */
.btn {
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
}

.btn-primary {
  background: var(--primary-blue);
  color: #ffffff;
}

.btn-primary:hover {
  background: var(--primary-blue-hover);
}

.btn-secondary {
  background: #334155;
  color: #ffffff;
}

.btn-secondary:hover {
  background: #1e293b;
}

.btn-outline {
  background: #ffffff;
  border: 1.5px solid #cbd5e1;
  color: #334155;
}

.btn-outline:hover {
  background: #f1f5f9;
}

.btn-danger {
  background: #dc2626;
  color: #ffffff;
}

.btn-danger:hover {
  background: #b91c1c;
}

/* ==========================================================================
   Modal Dialog
   ========================================================================== */

.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 20px;
}

.modal-box {
  background: #ffffff;
  border-radius: var(--radius-md);
  max-width: 480px;
  width: 100%;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  animation: modalEnter 0.2s ease;
}

@keyframes modalEnter {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

.modal-header {
  padding: 20px 24px;
  border-bottom: 1px solid #e2e8f0;
  display: flex;
  align-items: center;
  gap: 12px;
}

.modal-icon-warning {
  font-size: 24px;
}

.modal-header h3 {
  font-size: 18px;
  font-weight: 700;
  color: #1e293b;
}

.modal-body {
  padding: 20px 24px;
  font-size: 14.5px;
  color: #475569;
  line-height: 1.6;
}

.modal-alert-box {
  margin: 14px 0;
  padding: 12px 16px;
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: 6px;
  color: #92400e;
}

.modal-subtext {
  font-size: 13px;
  color: #64748b;
  margin-top: 10px;
}

.modal-footer {
  padding: 16px 24px;
  background: #f8fafc;
  border-top: 1px solid #e2e8f0;
  display: flex;
  justify-content: flex-end;
  gap: 12px;
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 768px) {
  html, body {
    overflow-x: hidden;
    width: 100%;
    max-width: 100vw;
  }

  .exam-header {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    padding: 8px 12px;
    max-width: 100vw;
    box-sizing: border-box;
    overflow: hidden;
  }

  .header-left {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    gap: 8px;
    flex-wrap: nowrap;
    min-width: 0;
  }

  .gcp-logo-container {
    gap: 8px;
    min-width: 0;
    flex: 1;
    overflow: hidden;
  }

  .exam-title-wrapper {
    min-width: 0;
    overflow: hidden;
  }

  .exam-org {
    display: none;
  }

  .exam-name {
    font-size: 13.5px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .gcp-cloud-icon {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
  }

  .mode-badge {
    font-size: 10.5px;
    padding: 3px 8px;
    white-space: nowrap;
    flex-shrink: 0;
  }

  .header-center {
    width: 100%;
    margin: 2px 0;
    max-width: 100%;
  }

  .header-right {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    gap: 8px;
  }

  .timer-box {
    padding: 4px 8px;
    font-size: 12px;
    gap: 6px;
    flex-shrink: 0;
  }

  .timer-label {
    display: none;
  }

  .mark-review-label {
    padding: 4px 8px;
    font-size: 12px;
    gap: 6px;
    flex-shrink: 0;
  }

  /* Subbar Responsive: grid layout so dropdowns never push screen width */
  .exam-subbar {
    padding: 8px 12px;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    box-sizing: border-box;
    max-width: 100vw;
    overflow: hidden;
  }

  .subbar-left {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    width: 100%;
  }

  .mode-dropdown-wrapper,
  .tag-filter-wrapper {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
  }

  .mode-dropdown-wrapper label,
  .tag-filter-wrapper label {
    font-size: 11px;
    color: var(--text-secondary);
  }

  .styled-select {
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    padding: 6px 8px;
    font-size: 12px;
    text-overflow: ellipsis;
    overflow: hidden;
    white-space: nowrap;
  }

  .subbar-right {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 6px;
    width: 100%;
    flex-wrap: wrap;
  }

  .search-box {
    flex: 1;
    min-width: 110px;
    max-width: 100%;
    padding: 4px 8px;
    box-sizing: border-box;
  }

  .search-box input {
    width: 100%;
    font-size: 12px;
  }

  .toggle-btn {
    padding: 4px 8px;
    font-size: 11px;
    white-space: nowrap;
    flex-shrink: 0;
  }

  .font-size-group {
    flex-shrink: 0;
  }

  .font-size-group button {
    padding: 4px 6px;
    font-size: 11px;
  }

  /* Viewport and Questions */
  .exam-viewport {
    margin-bottom: 140px;
    padding: 0 10px;
    max-width: 100vw;
    box-sizing: border-box;
    overflow-x: hidden;
  }

  .question-meta-card {
    padding: 16px 14px;
    box-sizing: border-box;
    max-width: 100%;
  }

  .q-header-row {
    margin-bottom: 12px;
    padding-bottom: 10px;
  }

  .question-text {
    font-size: 0.98rem;
    line-height: 1.65;
    word-break: break-word;
    overflow-wrap: break-word;
  }

  .options-container {
    gap: 10px;
    max-width: 100%;
  }

  .option-card {
    padding: 12px 14px;
    gap: 10px;
    box-sizing: border-box;
    word-break: break-word;
    max-width: 100%;
  }

  .opt-text {
    font-size: 0.93rem;
    line-height: 1.55;
    word-break: break-word;
    overflow-wrap: break-word;
  }

  .explanation-card {
    padding: 16px 14px;
    box-sizing: border-box;
    max-width: 100%;
  }

  .exp-tab-content {
    font-size: 13.5px;
    word-break: break-word;
    overflow-wrap: break-word;
  }

  .score-metrics-row {
    grid-template-columns: 1fr;
  }
  .exam-footer {
    display: grid !important;
    grid-template-columns: 1fr 1fr;
    grid-auto-rows: auto;
    gap: 8px;
    padding: 10px 14px calc(10px + env(safe-area-inset-bottom, 0px));
    box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.08);
  }
  .footer-left,
  .footer-center,
  .footer-right {
    display: contents !important;
  }
  /* Row 1: 이전 문제 | 다음 문제 */
  #prevBtn {
    grid-column: 1;
    grid-row: 1;
    width: 100%;
    margin: 0;
    justify-content: center;
    padding: 10px 8px;
    font-size: 13.5px;
  }
  #nextBtn {
    grid-column: 2;
    grid-row: 1;
    width: 100%;
    margin: 0;
    justify-content: center;
    padding: 10px 8px;
    font-size: 13.5px;
  }
  /* Row 2: 시험 종료 및 제출 | 문제 목록 / 검토 */
  #finishExamBtn {
    grid-column: 1;
    grid-row: 2;
    width: 100%;
    margin: 0;
    justify-content: center;
    padding: 10px 8px;
    font-size: 13.5px;
  }
  #gridToggleBtn {
    grid-column: 2;
    grid-row: 2;
    width: 100%;
    margin: 0;
    justify-content: center;
    padding: 10px 8px;
    font-size: 13.5px;
  }
  /* Row 3 (학습 모드 시): 정답 및 해설 보기 */
  #showAnswerBtn {
    grid-column: 1 / -1;
    grid-row: 3;
    width: 100%;
    margin: 0;
    justify-content: center;
    padding: 10px 8px;
    font-size: 13.5px;
  }
  .exam-footer .nav-btn,
  .exam-footer .footer-action-btn,
  .exam-footer .finish-btn {
    border-radius: 8px;
    white-space: nowrap;
    text-align: center;
    gap: 6px;
  }
  .sub-txt {
    display: none;
  }
}