/* 
 * 학습 분석 대시보드 통합 디자인 시스템 (2025 Refined - Premium Update)
 * 퍼스트펭귄 - 건강운동관리사 문제 풀이 플랫폼
 */

/* ========================================
   1. Design Tokens & Variables
   ======================================== */
:root {
  /* Brand Colors */
  --primary-color: #1D2F4E;
  /* Penguin Navy */
  --primary-light: #5FB2C9;
  /* Penguin Skyblue */
  --primary-dark: #162740;
  --secondary-color: #24AFCA;
  --accent-color: #A8D8E6;

  /* Functional Colors */
  --success-color: #059669;
  /* Emerald 600 */
  --success-bg: #ECFDF5;
  --warning-color: #D97706;
  /* Amber 600 */
  --warning-bg: #FFFBEB;
  --danger-color: #DC2626;
  /* Red 600 */
  --danger-bg: #FEF2F2;
  --info-color: #0284C7;
  /* Sky 600 */
  --info-bg: #F0F9FF;

  /* Neutrals */
  --text-primary: #1F2937;
  /* Gray 800 */
  --text-secondary: #4B5563;
  /* Gray 600 */
  --text-tertiary: #9CA3AF;
  /* Gray 400 */
  --background-page: #F8FAFC;
  /* Slate 50 */
  --background-card: #FFFFFF;
  --border-color: #E2E8F0;
  /* Slate 200 */

  /* UI Elements */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  /* Premium Shadow */

  --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);

  /* Glassmorphism - Premium */
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(255, 255, 255, 0.6);
  --glass-blur: blur(20px);
  --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.05);
  --glass-gradient: linear-gradient(135deg, rgba(255, 255, 255, 0.8), rgba(255, 255, 255, 0.4));

  /* Exam Types */
  --color-mock: #8B5CF6;
  /* Plus Violet */
  --color-regular: #0EA5E9;
  /* Plus Sky */
}

/* ========================================
   2. Global Layout & Utilities
   ======================================== */
.analytics-dashboard-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 20px;
  font-family: "Pretendard Variable", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text-primary);
  background-image:
    radial-gradient(circle at 0% 0%, rgba(95, 178, 201, 0.05) 0%, transparent 50%),
    radial-gradient(circle at 100% 100%, rgba(29, 47, 78, 0.05) 0%, transparent 50%);
  background-attachment: fixed;
  min-height: 100vh;
}

@media (max-width: 768px) {
  .analytics-dashboard-container {
    padding: 20px 16px;
  }
}

@media (max-width: 480px) {
  .analytics-dashboard-container {
    padding: 16px 12px;
  }
}

.dashboard-header {
  margin-bottom: 48px;
  text-align: center;
}

.dashboard-title {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--primary-color);
  margin-bottom: 12px;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.dashboard-description {
  color: var(--text-secondary);
  font-size: 1.1rem;
  font-weight: 500;
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.6;
}

/* Loading & No Data */
.no-data-message {
  text-align: center;
  padding: 80px 20px;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  color: var(--text-secondary);
  margin-top: 20px;
  box-shadow: var(--shadow-sm);
}

.dashboard-loader {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 100px 0;
  color: var(--text-secondary);
}

.loading-spinner {
  width: 48px;
  height: 48px;
  border: 4px solid rgba(95, 178, 201, 0.2);
  border-top-color: var(--primary-light);
  border-radius: 50%;
  animation: spin 1s cubic-bezier(0.5, 0.1, 0.5, 0.9) infinite;
  margin-bottom: 24px;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ========================================
   3. Sub-Tabs (Premium Pill Navigation)
   ======================================== */
.sub-tabs {
  display: flex;
  justify-content: center;
  gap: 8px;
  padding: 6px;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(8px);
  border-radius: 16px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.6);
  max-width: fit-content;
  margin: 0 auto 48px;
  flex-wrap: wrap;
}

.sub-tab-button {
  padding: 10px 24px;
  border-radius: 12px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-base);
  white-space: nowrap;
}

.sub-tab-button:hover {
  background-color: rgba(95, 178, 201, 0.1);
  color: var(--primary-color);
}

.sub-tab-button.active {
  background: linear-gradient(135deg, var(--primary-color) 0%, #2A4575 100%);
  color: white;
  box-shadow: 0 4px 12px rgba(29, 47, 78, 0.25);
  transform: translateY(-1px);
}

/* Mobile Sub-tabs */
@media (max-width: 640px) {
  .sub-tabs {
    justify-content: flex-start;
    overflow-x: auto;
    max-width: 100%;
    margin: 0 -20px 32px;
    padding: 12px 20px;
    border-radius: 0;
    border: none;
    background: transparent;
    box-shadow: none;
    scrollbar-width: none;
  }

  .sub-tabs::-webkit-scrollbar {
    display: none;
  }

  .sub-tab-button {
    padding: 8px 16px;
    font-size: 0.9rem;
    flex-shrink: 0;
    background: white;
    border: 1px solid var(--border-color);
  }

  .sub-tab-button.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
  }
}

.sub-tab-content {
  display: none;
  animation: fadeUp 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

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

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ========================================
   4. Learning Overview (Redesigned - Clean Grid)
   ======================================== */

/* Summary Banner - Premium Gradient with Reduced Height */
.cert-summary-banner {
  margin-bottom: 24px;
  padding: 32px;
  background: linear-gradient(120deg, var(--primary-color) 0%, #365885 50%, #5FB2C9 100%);
  border-radius: var(--radius-lg);
  color: white;
  display: flex;
  align-items: center;
  gap: 24px;
  box-shadow: 0 10px 30px -10px rgba(29, 47, 78, 0.3);
  position: relative;
  overflow: hidden;
}

@media (max-width: 640px) {
  .cert-summary-banner {
    flex-direction: column;
    align-items: flex-start;
    padding: 24px 20px;
    gap: 16px;
  }
  .cert-banner-icon {
    font-size: 32px;
    width: 60px;
    height: 60px;
  }
  .cert-banner-title {
    font-size: 1.25rem !important;
  }
  .cert-banner-stats {
    width: 100%;
    justify-content: flex-start;
    gap: 20px;
  }
}

/* Abstract decorations */
.cert-summary-banner::before {
  content: '';
  position: absolute;
  top: -20px;
  left: -20px;
  width: 150px;
  height: 150px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.15) 0%, transparent 70%);
  border-radius: 50%;
}

.cert-summary-banner::after {
  content: '';
  position: absolute;
  bottom: -50px;
  right: -20px;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(95, 178, 201, 0.3) 0%, transparent 60%);
  border-radius: 50%;
}

.cert-banner-icon {
  font-size: 48px;
  background: rgba(255, 255, 255, 0.1);
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 20px;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.25);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
  position: relative;
  z-index: 2;
}

.cert-banner-info {
  position: relative;
  z-index: 2;
  flex: 1;
}

.cert-banner-name {
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 4px;
}

.cert-banner-desc {
  font-size: 1rem;
  opacity: 0.9;
  font-weight: 500;
}

/* Clean Overview Grid */
.overview-stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}

@media (max-width: 640px) {
  .overview-stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-bottom: 24px;
  }
  .overview-stat-value {
    font-size: 1.75rem;
  }
  .overview-stat-item {
    padding: 16px;
  }
}

.overview-stat-item {
  background: white;
  padding: 24px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  text-align: center;
  transition: var(--transition-base);
}

.overview-stat-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  border-color: var(--primary-light);
}

.overview-stat-value {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--primary-color);
  margin-bottom: 8px;
  letter-spacing: -0.03em;
  line-height: 1;
}

.overview-stat-label {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 600;
}

/* ========================================
   5. Problem Solving Record (Table / List View)
   ======================================== */
.filter-controls {
  display: flex;
  gap: 16px;
  padding: 20px;
  background: #fff;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  margin-bottom: 24px;
  align-items: flex-end;
  box-shadow: var(--shadow-sm);
  flex-wrap: wrap;
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
  min-width: 120px;
}

.filter-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.filter-select {
  padding: 10px 14px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--text-primary);
  background-color: white;
  cursor: pointer;
  transition: var(--transition-base);
  font-family: inherit;
}

.filter-select:hover {
  border-color: var(--primary-light);
}

.filter-select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(29, 47, 78, 0.1);
}

.filter-button {
  padding: 10px 20px;
  background: linear-gradient(135deg, var(--primary-color) 0%, #2A4575 100%);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-base);
  font-family: inherit;
  white-space: nowrap;
  box-shadow: 0 2px 8px rgba(29, 47, 78, 0.2);
  height: fit-content;
}

.filter-button:hover {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
  box-shadow: 0 4px 12px rgba(29, 47, 78, 0.3);
  transform: translateY(-1px);
}

.filter-button:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(29, 47, 78, 0.2);
}

.filter-button.delete-all {
  background: linear-gradient(135deg, var(--danger-color) 0%, #B91C1C 100%);
  box-shadow: 0 2px 8px rgba(220, 38, 38, 0.2);
}

.filter-button.delete-all:hover {
  background: linear-gradient(135deg, #B91C1C 0%, var(--danger-color) 100%);
  box-shadow: 0 4px 12px rgba(220, 38, 38, 0.3);
}

.filter-buttons-group {
  display: flex;
  gap: 12px;
  align-items: flex-end;
}

/* ── 문제풀이기록 세션 카드 ─────────────────────────────── */

.session-list-container {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  max-width: 100%;
}

/* 카드 전체 — 3열 그리드: 본문 | 점수 | 액션 */
.session-card {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: stretch;
  background: #ffffff;
  border-radius: 14px;
  border: 1px solid #eef2f7;
  box-shadow: 0 2px 8px rgba(29, 47, 78, 0.06);
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.session-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(29, 47, 78, 0.13);
}

/* 카드 본문 */
.session-card-body {
  padding: 16px 18px;
  min-width: 0;
}

.session-card-header {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 6px;
  flex-wrap: wrap;
}

.session-badge {
  padding: 3px 10px;
  border-radius: 99px;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.2px;
  white-space: nowrap;
}

.session-badge.regular  { background: #EFF6FF; color: #1D4ED8; }
.session-badge.mockexam { background: #F5F3FF; color: #6D28D9; }

.session-badge-resume {
  padding: 3px 10px;
  border-radius: 99px;
  font-size: 0.72rem;
  font-weight: 700;
  background: #FEF3C7;
  color: #92400E;
  white-space: nowrap;
}

.session-card-date {
  font-size: 0.75rem;
  color: var(--text-tertiary, #9ca3af);
  margin-left: auto;
  white-space: nowrap;
}

.session-card-title {
  font-size: 0.97rem;
  font-weight: 700;
  color: var(--penguin-navy, #1D2F4E);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 10px;
}

/* 진행률 바 */
.session-progress-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
}

.session-progress-bar {
  flex: 1;
  height: 6px;
  background: #f1f5f9;
  border-radius: 99px;
  overflow: hidden;
}

.session-progress-fill {
  height: 100%;
  border-radius: 99px;
  transition: width 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

.session-progress-fill.score-high { background: #059669; }
.session-progress-fill.score-good { background: var(--penguin-skyblue, #5FB2C9); }
.session-progress-fill.score-mid  { background: #F59E0B; }
.session-progress-fill.score-low  { background: #EF4444; }

.session-progress-text {
  font-size: 0.75rem;
  color: var(--text-secondary, #6b7280);
  white-space: nowrap;
  flex-shrink: 0;
}

/* 진행률 퍼센트 (프로그레스 바 옆) */
.session-progress-pct {
  font-size: 0.72rem;
  font-weight: 700;
  white-space: nowrap;
  flex-shrink: 0;
}
.session-progress-pct.score-high { color: #059669; }
.session-progress-pct.score-good { color: var(--penguin-skyblue, #5FB2C9); }
.session-progress-pct.score-mid  { color: #F59E0B; }
.session-progress-pct.score-low  { color: #EF4444; }

/* 풀이 문항 / 취득 점수 인포 행 */
.session-info-row {
  display: flex;
  gap: 16px;
  margin-top: 8px;
  justify-content: space-between;
}
.session-info-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.session-info-label {
  font-size: 0.68rem;
  color: var(--text-tertiary, #9ca3af);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}
.session-info-value {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--penguin-navy, #1D2F4E);
  line-height: 1.2;
}
.session-info-value.score-high { color: #059669; }
.session-info-value.score-good { color: var(--penguin-skyblue, #5FB2C9); }
.session-info-value.score-mid  { color: #F59E0B; }
.session-info-value.score-low  { color: #EF4444; }
.session-info-denom {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-secondary, #6b7280);
}

/* 점수 영역 */
.session-card-score {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 12px 8px;
  border-left: 1px solid #f1f5f9;
}

.session-score-value {
  font-size: 1.6rem;
  font-weight: 900;
  line-height: 1;
}

.session-score-value.score-high { color: #059669; }
.session-score-value.score-good { color: var(--penguin-skyblue, #5FB2C9); }
.session-score-value.score-mid  { color: #F59E0B; }
.session-score-value.score-low  { color: #EF4444; }

.session-score-label {
  font-size: 0.7rem;
  color: var(--text-tertiary, #9ca3af);
  margin-top: 3px;
  font-weight: 600;
}

/* 액션 버튼 */
.session-card-actions {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 14px 14px 8px;
  justify-content: center;
}

.session-btn {
  padding: 7px 14px;
  border-radius: 8px;
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
  border: none;
  transition: background 0.2s, transform 0.1s;
  white-space: nowrap;
  text-align: center;
}

.session-btn:active { transform: scale(0.97); }

.session-btn-resume {
  background: var(--penguin-navy, #1D2F4E);
  color: #ffffff;
}
.session-btn-resume:hover { background: var(--penguin-skyblue, #5FB2C9); }

.session-btn-retry {
  background: #f0fdf4;
  color: #059669;
  border: 1px solid #a7f3d0;
}
.session-btn-retry:hover { background: #d1fae5; }

.session-btn-record {
  background: #f0f7ff;
  color: var(--penguin-navy, #1D2F4E);
  border: 1px solid #d0e4f7;
}
.session-btn-record:hover { background: #ddeeff; }

.session-btn-delete {
  background: transparent;
  color: #c4c9d4;
  font-size: 1rem;
  padding: 6px;
}
.session-btn-delete:hover { background: #fff1f2; color: #EF4444; }

/* 모바일 반응형 */
@media (max-width: 640px) {
  .session-list-container {
    grid-template-columns: 1fr;
  }

  .session-card {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto;
  }

  .session-card-body {
    padding: 14px 14px 8px;
    grid-column: 1;
  }

  .session-card-score {
    display: none;
  }

  .session-card-actions {
    grid-column: 1;
    flex-direction: row;
    padding: 0 14px 14px;
    gap: 8px;
  }

  .session-btn-resume,
  .session-btn-record {
    flex: 1;
  }

  .session-btn-delete {
    flex-shrink: 0;
  }

  .session-card-title {
    font-size: 0.88rem;
    margin-bottom: 8px;
  }
}

@media (max-width: 480px) {
  .session-btn {
    padding: 8px 10px;
    font-size: 0.76rem;
  }
}

/* ========================================
   6. 정오표 모달 (Scorecard Modal)
   ======================================== */
.sc-modal {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.55);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 9999;
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0;
  transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.sc-modal-content {
  background: #ffffff;
  border-radius: 24px;
  width: 90%;
  max-width: 920px;
  max-height: 90vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

.sc-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 22px 32px;
  background: linear-gradient(135deg, #1D2F4E 0%, #2a4570 100%);
  border-radius: 24px 24px 0 0;
  flex-shrink: 0;
}

.sc-modal-title {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: -0.3px;
}

.sc-modal-close {
  width: 36px;
  height: 36px;
  border: none;
  background: rgba(255, 255, 255, 0.12);
  border-radius: 50%;
  font-size: 22px;
  font-weight: 300;
  cursor: pointer;
  color: #ffffff;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  transition: background 0.2s, transform 0.2s;
  flex-shrink: 0;
}

.sc-modal-close:hover {
  background: rgba(255, 255, 255, 0.24);
  transform: rotate(90deg);
}

.sc-modal-body {
  padding: 28px 32px;
  overflow-y: auto;
  flex: 1;
}

/* 요약 카드 */
.sc-summary {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 16px;
  padding: 24px 28px;
  margin-bottom: 24px;
}

.sc-stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 20px;
}

.sc-stat {
  text-align: center;
}

.sc-stat-label {
  font-size: 12px;
  color: #64748b;
  font-weight: 500;
  letter-spacing: 0.2px;
  margin-bottom: 6px;
}

.sc-stat-value {
  font-size: 30px;
  font-weight: 700;
  line-height: 1.15;
  color: #1D2F4E;
}

.sc-stat-value.green { color: #059669; }
.sc-stat-value.red   { color: #DC2626; }

.sc-progress-bar-wrap {
  height: 8px;
  background: #f1f5f9;
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 12px;
}

.sc-progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #059669 0%, #10b981 100%);
  border-radius: 999px;
  transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.sc-date {
  font-size: 12px;
  color: #94a3b8;
  text-align: center;
}

/* 섹션 */
.sc-section {
  margin-top: 16px;
}

.sc-section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-bottom: none;
  border-radius: 12px 12px 0 0;
}

.sc-section-title {
  font-size: 14px;
  font-weight: 700;
  color: #1D2F4E;
}

.sc-section-count {
  font-size: 12px;
  color: #475569;
}

.sc-list {
  border: 1px solid #e2e8f0;
  border-radius: 0 0 12px 12px;
  overflow: hidden;
  background: #ffffff;
}

/* 정오표 행 */
.sc-row {
  display: grid;
  grid-template-columns: 74px 64px 1fr 84px;
  gap: 10px;
  align-items: center;
  padding: 10px 14px;
  border-bottom: 1px solid #eef2f7;
}

.sc-row:last-child {
  border-bottom: none;
}

.sc-row-num {
  font-size: 13px;
  font-weight: 700;
  color: #111827;
}

.sc-status-badge {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  width: 52px;
  padding: 3px 0;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
}

.sc-status-badge.correct {
  background: #ecfdf3;
  color: #047857;
}

.sc-status-badge.incorrect {
  background: #fef2f2;
  color: #b91c1c;
}

.sc-answer-text {
  font-size: 12px;
  color: #374151;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sc-answer-text strong {
  color: #111827;
}

.sc-check-btn {
  justify-self: end;
  background: #1D2F4E;
  color: #ffffff;
  border: none;
  border-radius: 8px;
  padding: 5px 10px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
  white-space: nowrap;
}

.sc-check-btn:hover {
  background: #2a4570;
}

@media (max-width: 640px) {
  .sc-modal-body {
    padding: 20px 16px;
  }

  .sc-modal-header {
    padding: 18px 20px;
  }

  .sc-stats-row {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .sc-stat-value {
    font-size: 26px;
  }

  .sc-row {
    grid-template-columns: 60px 56px 1fr 70px;
    gap: 6px;
    padding: 9px 10px;
  }
}

/* ========================================
   7. Weak Areas (List View)
   ======================================== */
.weak-areas-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.weak-area-item {
  background: var(--background-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  padding: 0;
  transition: var(--transition-base);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.weak-area-item:hover {
  border-color: #E2E8F0;
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.weak-area-content {
  padding: 24px;
}

.weak-area-title-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 16px;
  gap: 16px;
}

.weak-area-subject {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
  line-height: 1.4;
  flex: 1;
  letter-spacing: -0.01em;
}

.weak-area-percentage {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
  white-space: nowrap;
  letter-spacing: -0.02em;
}

.weak-area-info-row {
  margin-bottom: 16px;
}

.weak-area-details {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 0.875rem;
}

.weak-detail-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.weak-detail-label {
  color: var(--text-tertiary);
  font-weight: 500;
}

.weak-detail-value {
  color: var(--text-secondary);
  font-weight: 600;
}

.weak-detail-divider {
  color: var(--text-tertiary);
  font-size: 0.75rem;
}

.weak-area-progress-container {
  margin-top: 4px;
}

.weak-area-progress-bar {
  position: relative;
  height: 6px;
  background: #F1F5F9;
  border-radius: 999px;
  overflow: hidden;
}

.weak-area-progress-fill {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: var(--progress);
  background: var(--progress-color);
  border-radius: 999px;
  transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
  opacity: 0.9;
}

.weak-area-progress-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, 
    transparent 0%, 
    rgba(255, 255, 255, 0.3) 50%, 
    transparent 100%);
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

/* 모바일 반응형 */
@media (max-width: 640px) {
  .weak-area-content {
    padding: 20px;
  }
  
  .weak-area-title-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
  
  .weak-area-percentage {
    font-size: 1.25rem;
  }
  
  .weak-area-subject {
    font-size: 1rem;
  }
  
  .weak-area-details {
    font-size: 0.8125rem;
    gap: 8px;
  }
}

/* ========================================
   7. Other Components (Charts, etc)
   ======================================== */
.score-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}

.score-card {
  padding: 24px;
  border-radius: var(--radius-lg);
  color: white;
  text-align: center;
  box-shadow: var(--shadow-md);
  transition: var(--transition-base);
  position: relative;
  overflow: hidden;
}

.score-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.score-card-primary {
  background: linear-gradient(135deg, #1D2F4E 0%, #365885 100%);
}

.score-card-secondary {
  background: linear-gradient(135deg, #24AFCA 0%, #5FB2C9 100%);
}

.score-card-info {
  background: linear-gradient(135deg, #0EA5E9 0%, #0369A1 100%);
}

.score-card-neutral {
  background: white;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.score-value-large {
  font-size: 2.2rem;
  font-weight: 800;
  margin: 12px 0;
  letter-spacing: -0.02em;
}

@media (max-width: 480px) {
  .score-value-large {
    font-size: 1.75rem;
  }
  .score-card {
    padding: 16px;
  }
  .score-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }
}

/* Review Grid — Clean Glass Style */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}

.review-card {
  background: var(--glass-bg, rgba(255,255,255,0.7));
  backdrop-filter: var(--glass-blur, blur(12px));
  -webkit-backdrop-filter: var(--glass-blur, blur(12px));
  border: 1px solid var(--glass-border, rgba(255,255,255,0.3));
  border-radius: var(--radius-premium, 16px);
  padding: 20px;
  transition: all 0.3s cubic-bezier(0.165, 0.84, 0.44, 1);
  display: flex;
  flex-direction: column;
}

.review-card:hover {
  transform: translateY(-6px);
  background: rgba(255, 255, 255, 0.9);
  border-color: var(--penguin-skyblue);
  box-shadow: var(--shadow-lg, 0 12px 32px rgba(0,0,0,0.1));
}

.review-year {
  font-size: 0.8rem;
  color: var(--text-tertiary);
  font-weight: 600;
  margin-bottom: 2px;
}

.review-title {
  font-size: 1.05rem;
  font-weight: 750;
  color: var(--penguin-navy, #1D2F4E);
  margin-bottom: 10px;
  line-height: 1.4;
  letter-spacing: -0.02em;
}

.review-status {
  margin-bottom: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.review-btn {
  margin-top: auto;
  padding: 10px;
  text-align: center;
  background: rgba(29, 47, 78, 0.05);
  color: var(--penguin-navy);
  border: 1px solid rgba(29, 47, 78, 0.08);
  border-radius: 10px;
  text-decoration: none;
  font-weight: 700;
  font-size: 0.9rem;
  transition: all 0.3s ease;
}

.review-btn:hover {
  background: var(--penguin-navy);
  color: #fff;
  border-color: var(--penguin-navy);
}

/* Trend Container */
.trend-container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  background: white;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  overflow: hidden;
  margin-bottom: 40px;
  box-shadow: var(--shadow-sm);
}

.trend-item {
  padding: 32px 24px;
  text-align: center;
  border-right: 1px solid var(--border-color);
  background: white;
  transition: background 0.2s;
}

.trend-item:hover {
  background: #F8FAFC;
}

.trend-item:last-child {
  border-right: none;
}

/* Subject Progress (for format reference) */
.subject-progress-container {
  padding: 10px 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.subject-progress-item {
  background: white;
  padding: 16px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

.subject-progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.subject-name {
  font-weight: 700;
  color: var(--text-primary);
  font-size: 1rem;
}

.subject-stats {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
  background: #F1F5F9;
  padding: 4px 8px;
  border-radius: 6px;
}

.progress-bar-container,
.progress-bar-bg {
  height: 10px;
  background-color: #F1F5F9;
  border-radius: 999px;
  overflow: hidden;
}

.progress-bar,
.progress-bar-fill {
  height: 100%;
  border-radius: 999px;
  background-color: var(--primary-light);
  transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Responsive Adjustments */
@media (max-width: 1024px) {
  .overview-stats-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .overview-stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
  }

  .trend-container {
    grid-template-columns: 1fr 1fr;
  }

  .trend-item:nth-child(2) {
    border-right: none;
  }

  .trend-item {
    border-bottom: 1px solid var(--border-color);
  }

  .filter-controls {
    flex-direction: column;
    align-items: stretch;
  }

  .filter-group {
    width: 100%;
  }

  .filter-buttons-group {
    width: 100%;
    flex-direction: column;
    gap: 10px;
  }

  .filter-button {
    width: 100%;
  }
}

/* Weak Questions — Clean Glass Style */
.weak-question-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}

.weak-question-card {
  background: var(--glass-bg, rgba(255,255,255,0.7));
  backdrop-filter: var(--glass-blur, blur(12px));
  -webkit-backdrop-filter: var(--glass-blur, blur(12px));
  border: 1px solid var(--glass-border, rgba(255,255,255,0.3));
  border-radius: var(--radius-premium, 16px);
  padding: 20px;
  transition: all 0.3s cubic-bezier(0.165, 0.84, 0.44, 1);
  display: flex;
  flex-direction: column;
}

.weak-question-card:hover {
  transform: translateY(-6px);
  background: rgba(255, 255, 255, 0.9);
  border-color: var(--penguin-skyblue);
  box-shadow: var(--shadow-lg, 0 12px 32px rgba(0,0,0,0.1));
}

.weak-question-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 12px;
}

.weak-question-year {
  font-size: 0.8rem;
  color: var(--text-tertiary);
  font-weight: 600;
  margin-bottom: 2px;
}

.weak-question-subject {
  font-size: 1.05rem;
  font-weight: 750;
  color: var(--penguin-navy, #1D2F4E);
  letter-spacing: -0.02em;
}

.weak-question-accuracy {
  font-size: 1.4rem;
  font-weight: 800;
  line-height: 1;
  text-align: right;
  flex-shrink: 0;
}

.weak-question-accuracy-label {
  display: block;
  font-size: 0.7rem;
  color: var(--text-tertiary);
  font-weight: 500;
  margin-top: 3px;
}

.weak-question-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  background: rgba(29, 47, 78, 0.04);
  border-radius: 8px;
  border: 1px solid rgba(29, 47, 78, 0.03);
  margin-bottom: 4px;
}

.weak-question-num {
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--penguin-navy);
}

.weak-question-divider {
  display: inline-block;
  width: 1px;
  height: 12px;
  background: rgba(0,0,0,0.1);
}

.weak-question-stat {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.weak-question-wrong {
  color: var(--danger-color, #DC2626);
}

.weak-question-btn {
  width: 100%;
  padding: 10px;
  background: rgba(29, 47, 78, 0.05);
  color: var(--penguin-navy);
  border: 1px solid rgba(29, 47, 78, 0.08);
  border-radius: 10px;
  cursor: pointer;
  font-weight: 700;
  margin-top: auto;
  padding-top: 14px;
  font-size: 0.9rem;
  min-height: 42px;
  transition: all 0.3s ease;
}

.weak-question-btn:hover {
  background: var(--penguin-navy);
  color: #fff;
  border-color: var(--penguin-navy);
}

.weak-question-btn:active {
  transform: scale(0.98);
}

@media (max-width: 480px) {
  .weak-question-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  .weak-question-card {
    padding: 16px;
  }
}

.weak-question-wrong {
  color: var(--danger-color);
}/* 정오표 그리드 스타일 */
.scorecard-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 12px;
}

@media (max-width: 600px) {
    .scorecard-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.scorecard-item {
    background: white;
    border: 1px solid #eee;
    border-radius: 8px;
    padding: 10px;
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    aspect-ratio: 1 / 1;
}

.scorecard-item.correct {
    background-color: rgba(16, 185, 129, 0.05);
    /* Green tint */
    border-color: rgba(16, 185, 129, 0.2);
}

.scorecard-item.incorrect {
    background-color: rgba(239, 68, 68, 0.05);
    /* Red tint */
    border-color: rgba(239, 68, 68, 0.2);
}

.scorecard-num {
    font-size: 0.8rem;
    color: #888;
    margin-bottom: 4px;
}

.scorecard-result {
    font-size: 1.5rem;
    font-weight: bold;
}

.mark-o {
    color: #10b981;
    /* Green */
}

.mark-x {
    color: #ef4444;
    /* Red */
}

.scorecard-answer-info {
    font-size: 0.7rem;
    margin-top: 4px;
    background: rgba(255, 255, 255, 0.8);
    padding: 2px 4px;
    border-radius: 4px;
}

.my-ans {
    display: block;
    color: #ef4444;
}

.cor-ans {
    display: block;
    color: #10b981;
    font-weight: bold;
}

/* 개선된 카드 형식 스타일 (모달에서도 사용) */
.scorecard-section {
    margin-bottom: 32px;
}

.scorecard-section:last-child {
    margin-bottom: 0;
}

.section-header {
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid #e2e8f0;
}

.section-title {
    font-size: 1.1rem;
    font-weight: 800;
    color: #1e293b;
    margin: 0;
    display: flex;
    align-items: center;
    gap: 8px;
}

.section-icon {
    font-size: 1.2rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 6px;
    font-weight: 700;
}

.correct-icon {
    background: #ecfdf5;
    color: #059669;
}

.incorrect-icon {
    background: #fef2f2;
    color: #dc2626;
}

.section-count {
    font-size: 0.9rem;
    font-weight: 600;
    color: #64748b;
    margin-left: 4px;
}

.scorecard-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
}

@media (max-width: 768px) {
    .scorecard-cards-grid {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
        gap: 12px;
    }
}

.scorecard-question-card {
    background: white;
    border-radius: 12px;
    padding: 16px;
    border: 2px solid #e2e8f0;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.scorecard-question-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.correct-card {
    border-color: #10b981;
    background: linear-gradient(to bottom, #ecfdf5 0%, #ffffff 20%);
}

.incorrect-card {
    border-color: #ef4444;
    background: linear-gradient(to bottom, #fef2f2 0%, #ffffff 20%);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid #f1f5f9;
}

.question-number {
    font-size: 1rem;
    font-weight: 800;
    color: #1e293b;
}

.result-badge {
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 800;
}

.correct-badge {
    background: #10b981;
    color: white;
}

.incorrect-badge {
    background: #ef4444;
    color: white;
}

.card-content {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.answer-info {
    display: flex;
    align-items: center;
    gap: 8px;
}

.answer-label {
    font-size: 0.8rem;
    color: #64748b;
    font-weight: 600;
    min-width: 70px;
}

.answer-value {
    font-size: 0.95rem;
    font-weight: 700;
    color: #1e293b;
}

.correct-answer {
    color: #10b981;
}

.incorrect-user-answer {
    color: #ef4444;
}

.correct-answer-section {
    margin-top: 4px;
    padding-top: 8px;
    border-top: 1px dashed #e2e8f0;
}

.correct-answer-highlight {
    color: #10b981;
    font-size: 1rem;
    font-weight: 800;
    background: #ecfdf5;
    padding: 4px 10px;
    border-radius: 6px;
    display: inline-block;
}

.no-data-message {
    text-align: center;
    padding: 40px 20px;
    color: #64748b;
    font-size: 1rem;
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10000;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal-overlay[style*="display: flex"] {
    opacity: 1;
}

.modal-content {
    background: white;
    padding: 24px;
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

/* ========================================
  8. Admin Stats Dashboard & Data Management
  ======================================== */
.stats-card {
  background: var(--background-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  margin-bottom: 24px;
}

.stats-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--primary-color);
  border-bottom: 1px solid var(--border-color);
  background: linear-gradient(180deg, rgba(95, 178, 201, 0.12) 0%, rgba(95, 178, 201, 0.03) 100%);
}

.stats-section {
  padding: 22px 24px;
}

.stats-section + .stats-section {
  border-top: 1px solid var(--border-color);
}

.stats-intro p {
  margin: 0;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  background: rgba(29, 47, 78, 0.04);
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.data-management-controls {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.control-description {
  padding: 14px 16px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(95, 178, 201, 0.28);
  background: linear-gradient(135deg, rgba(240, 249, 255, 0.95) 0%, rgba(248, 250, 252, 0.95) 100%);
}

.control-description p {
  margin: 0;
  color: var(--text-secondary);
  line-height: 1.6;
  font-size: 0.92rem;
}

.data-management-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.mgmt-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 42px;
  border: 1px solid transparent;
  border-radius: 10px;
  padding: 10px 16px;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition-base);
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.08);
}

.mgmt-button .button-icon {
  font-size: 1rem;
}

.sync-button {
  color: #fff;
  background: linear-gradient(135deg, var(--primary-color) 0%, #365885 100%);
}

.sync-button:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 18px rgba(29, 47, 78, 0.24);
}

.reset-button {
  color: #fff;
  background: linear-gradient(135deg, var(--danger-color) 0%, #B91C1C 100%);
}

.reset-button:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 18px rgba(220, 38, 38, 0.26);
}

.year-reset-controls {
  padding: 14px;
  border-radius: var(--radius-md);
  border: 1px dashed #cbd5e1;
  background: #f8fafc;
}

.year-reset-title {
  margin-bottom: 10px;
  color: var(--text-secondary);
  font-size: 0.88rem;
  font-weight: 700;
}

.year-reset-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.year-reset-button {
  border: 1px solid #cbd5e1;
  border-radius: 999px;
  background: #fff;
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 700;
  padding: 7px 12px;
  cursor: pointer;
  transition: var(--transition-base);
}

.year-reset-button:hover {
  border-color: var(--primary-light);
  color: var(--primary-color);
  background: rgba(95, 178, 201, 0.12);
}

.admin-controls {
  padding: 20px 24px 0;
}

.admin-filters {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  padding: 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
}

.admin-filters .filter-group {
  min-width: 0;
}

.admin-button {
  border: none;
  border-radius: 10px;
  padding: 11px 16px;
  background: linear-gradient(135deg, var(--primary-color) 0%, #2A4575 100%);
  color: #fff;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition-base);
  box-shadow: 0 6px 16px rgba(29, 47, 78, 0.2);
}

.admin-button:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 18px rgba(29, 47, 78, 0.28);
}

#admin-stats-content .stats-section h3 {
  margin: 0 0 12px;
  font-size: 1rem;
  font-weight: 800;
  color: var(--primary-color);
}

.question-stats-table-container {
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: #fff;
}

.stats-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 480px;
}

.stats-table th,
.stats-table td {
  padding: 12px 14px;
  text-align: center;
  border-bottom: 1px solid #eef2f7;
  font-size: 0.9rem;
}

.stats-table thead th {
  background: #f8fafc;
  color: var(--text-secondary);
  font-weight: 700;
  position: sticky;
  top: 0;
}

.stats-table tbody tr:hover {
  background: rgba(95, 178, 201, 0.08);
}

@media (max-width: 768px) {
  .stats-header {
    padding: 16px 18px;
    font-size: 0.98rem;
  }

  .stats-section {
    padding: 16px 18px;
  }

  .admin-controls {
    padding: 16px 18px 0;
  }

  .admin-filters {
    grid-template-columns: 1fr;
  }

  .admin-button,
  .data-management-actions .mgmt-button {
    width: 100%;
  }

  .year-reset-buttons {
    gap: 6px;
  }

  .year-reset-button {
    font-size: 0.8rem;
    padding: 6px 10px;
  }
}

/* ========================================
   모바일 핵심 UX — 학습분석 전용 최적화
   (320px ~ 480px 소형 디바이스 완전 대응)
   ======================================== */

/* stats-card 패딩 최적화 */
@media (max-width: 480px) {
  .stats-header {
    padding: 14px 16px;
    font-size: 0.95rem;
  }

  .stats-section {
    padding: 16px;
  }

  /* 문제풀이기록 필터 개선 */
  .filter-controls {
    padding: 14px 16px;
    gap: 12px;
  }

  .filter-group label {
    font-size: 0.8rem;
  }

  .filter-select {
    padding: 8px 10px;
    font-size: 0.85rem;
    min-height: 44px;
  }

  /* 세션 카드 */
  .session-card-body {
    padding: 12px 14px 6px;
  }

  .session-badge {
    font-size: 0.7rem;
    padding: 3px 8px;
  }

  /* 약점 분석 카드 개선 */
  .weak-area-content {
    padding: 16px;
  }

  /* 복습 추천 카드 */
  .review-card {
    padding: 16px;
  }

  .review-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  /* 정오표 그리드 */
  .scorecard-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
  }

  .scorecard-item {
    padding: 8px 6px;
    font-size: 0.8rem;
  }

  /* 합격 기준 카드 */
  .info-content ul {
    padding-left: 16px;
  }

  .info-content li {
    font-size: 0.875rem;
    line-height: 1.6;
  }
}

/* 터치 타겟 강화 — 학습분석 인터랙션 */
@media (max-width: 768px) {
  .weak-question-btn,
  .session-btn,
  .filter-button,
  .mgmt-button,
  .sync-button {
    min-height: 44px;
    font-size: 0.95rem;
  }

  .sub-tab-button {
    min-height: 44px;
    min-width: 80px;
    padding: 10px 14px;
  }

  /* 세션 카드 탭 피드백 */
  .session-card {
    -webkit-tap-highlight-color: rgba(95, 178, 201, 0.1);
  }

  /* 약점 분석 카드 터치 피드백 */
  .weak-area-item:active,
  .weak-question-card:active,
  .session-list-item:active {
    transform: scale(0.99);
    opacity: 0.95;
    transition: transform 0.1s ease, opacity 0.1s ease;
  }

  /* 차트 컨테이너 높이 조정 */
  .chart-container,
  canvas {
    max-height: 260px;
  }
}

/* ── 학습 캘린더 ────────────────────────── */
#study-calendar-container {
  background: var(--color-bg-level-0, #fff);
  border: 1px solid var(--color-border-primary, #e2e8f0);
  border-radius: 14px;
  padding: 20px;
}
.cal-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 6px;
}
.cal-month-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text-primary, #1D2F4E);
  min-width: 100px;
  text-align: center;
}
.cal-nav {
  background: none;
  border: 1px solid var(--color-border-primary, #e2e8f0);
  border-radius: 8px;
  width: 32px;
  height: 32px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-text-secondary, #64748b);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}
.cal-nav:hover {
  background: var(--color-bg-level-1, #f1f5f9);
}
/* cal-streak removed - replaced by cal-streak-badge */
.cal-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 4px;
}
.cal-day-name {
  text-align: center;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--color-text-tertiary, #94a3b8);
  padding-bottom: 4px;
}
.cal-cell {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  background: var(--color-bg-level-1, #f8fafc);
  position: relative;
  transition: transform 0.15s;
}
.cal-cell.empty {
  background: transparent;
}
.cal-cell.lv1 { background: rgba(95,178,201,0.2); }
.cal-cell.lv2 { background: rgba(95,178,201,0.4); }
.cal-cell.lv3 { background: rgba(29,47,78,0.4); }
.cal-cell.lv4 { background: rgba(29,47,78,0.7); }
.cal-cell.lv3 .cal-date,
.cal-cell.lv4 .cal-date { color: #fff; }
.cal-cell.today {
  outline: 2px solid #1D2F4E;
  outline-offset: -2px;
}
.cal-date {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--color-text-secondary, #64748b);
}
.cal-legend {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  margin-top: 12px;
}
.cal-legend-label {
  font-size: 0.65rem;
  color: var(--color-text-tertiary, #94a3b8);
  margin: 0 4px;
}
.cal-legend-box {
  width: 14px;
  height: 14px;
  border-radius: 3px;
  background: var(--color-bg-level-1, #f1f5f9);
}
.cal-legend-box.lv1 { background: rgba(95,178,201,0.2); }
.cal-legend-box.lv2 { background: rgba(95,178,201,0.4); }
.cal-legend-box.lv3 { background: rgba(29,47,78,0.4); }
.cal-legend-box.lv4 { background: rgba(29,47,78,0.7); }

.cal-month-summary {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 14px;
}
.cal-streak-badge {
  font-size: 0.72rem;
  font-weight: 700;
  color: #fff;
  background: #1D2F4E;
  padding: 3px 10px;
  border-radius: 99px;
}
.cal-month-stat {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-secondary, #64748b);
}
.cal-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 12px;
}
.cal-hint {
  font-size: 0.68rem;
  color: var(--color-text-tertiary, #94a3b8);
}
.cal-detail-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}
.cal-detail-total {
  font-size: 0.78rem;
  font-weight: 700;
  color: #1D2F4E;
}
.cal-cell.clickable { cursor: pointer; }
.cal-cell.clickable:hover { transform: scale(1.1); z-index: 1; }
.cal-cell.selected {
  outline: 2.5px solid #5FB2C9;
  outline-offset: -2px;
}
.cal-detail {
  margin-top: 14px;
  padding: 14px 16px;
  background: var(--color-bg-level-1, #f8fafc);
  border-radius: 10px;
}
.cal-detail-title {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-text-primary, #1D2F4E);
  margin-bottom: 8px;
}
.cal-detail-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 5px 0;
  border-bottom: 1px solid var(--color-border-primary, #e2e8f0);
}
.cal-detail-row:last-child { border-bottom: none; }
.cal-detail-label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-text-secondary, #64748b);
}
.cal-detail-count {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-text-primary, #1D2F4E);
}

@media (max-width: 480px) {
  #study-calendar-container { padding: 14px 10px; }
  .cal-cell { border-radius: 6px; }
  .cal-date { font-size: 0.65rem; }
  .cal-month-title { font-size: 0.9rem; }
  .cal-detail { padding: 10px 12px; }
  .cal-detail-label { font-size: 0.72rem; }
}

/* ── 문제 미리보기 모달 ────────────────────── */
#question-preview-modal {
  position: fixed;
  inset: 0;
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
}
.qp-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.5);
}
.qp-container {
  position: relative;
  background: #fff;
  border-radius: 16px;
  width: 92%;
  max-width: 520px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
  animation: qpSlideUp 0.25s ease;
}
@keyframes qpSlideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
.qp-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid #e2e8f0;
}
.qp-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: #1D2F4E;
}
.qp-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  color: #94a3b8;
  cursor: pointer;
  line-height: 1;
  padding: 0 4px;
}
.qp-close:hover { color: #1D2F4E; }
.qp-body {
  overflow-y: auto;
  padding: 16px 20px;
  flex: 1;
}
.qp-loading {
  text-align: center;
  color: #94a3b8;
  padding: 40px 0;
  font-size: 0.85rem;
}
.qp-image {
  width: 100%;
  border-radius: 8px;
  margin-bottom: 12px;
}
.qp-explanation {
  font-size: 0.82rem;
  color: #475569;
  line-height: 1.6;
  padding: 12px;
  background: #f8fafc;
  border-radius: 8px;
  border-left: 3px solid #5FB2C9;
}
.qp-footer {
  padding: 12px 20px;
  border-top: 1px solid #e2e8f0;
}
.qp-answer-info {
  display: flex;
  align-items: center;
  gap: 10px;
}
.qp-badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 99px;
}
.qp-badge.correct { background: rgba(29,47,78,0.1); color: #1D2F4E; }
.qp-badge.incorrect { background: rgba(239,68,68,0.1); color: #ef4444; }
.qp-answer-text { font-size: 0.8rem; color: #64748b; }
.qp-error { text-align: center; color: #94a3b8; padding: 30px 0; font-size: 0.85rem; }
.qp-link { color: #5FB2C9; text-decoration: underline; }

@media (max-width: 480px) {
  .qp-container { width: 96%; max-height: 90vh; border-radius: 12px; }
  .qp-header { padding: 12px 16px; }
  .qp-body { padding: 12px 16px; }
  .qp-footer { padding: 10px 16px; }
}