/* PDF-inspired Reading Log & Worksheet Styles (Torn Grid Paper Aesthetic) */

.reading-container {
  max-width: 1040px;
  margin: 1.5rem auto 3.5rem;
}

.reading-header {
  text-align: center;
  margin-bottom: 2rem;
}

/* Template Switcher Tabs */
.reading-template-tabs {
  display: flex;
  background: var(--bg-subtle);
  border: 1px solid var(--border-light);
  padding: 0.35rem;
  border-radius: var(--radius-full);
  margin-bottom: 2rem;
  gap: 0.35rem;
  overflow-x: auto;
}

.template-tab-btn {
  flex: 1;
  padding: 0.6rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition-fast);
  text-align: center;
  white-space: nowrap;
}

.template-tab-btn:hover {
  color: var(--text-primary);
}

.template-tab-btn.active {
  background: var(--brand-black);
  color: #FFFFFF;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}

/* Book Source Switcher (추천도서 vs 직접입력) */
.book-source-toggle {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.book-source-btn {
  padding: 0.45rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 700;
  border: 1px solid var(--border-light);
  background: #FFFFFF;
  color: var(--text-secondary);
  cursor: pointer;
}

.book-source-btn.active {
  background: #4F46E5;
  color: #FFFFFF;
  border-color: #4F46E5;
}

/* 책 선택 카드: '내가 읽은 도서'를 크게, 색으로 강조 */
.book-source-picker {
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow-xs);
}

.book-source-cards {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 1rem;
}

.book-source-card {
  position: relative;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  border: 2px solid var(--border-light);
  border-radius: 16px;
  background: #F8FAFC;
  color: #334155;
  text-align: left;
  font-family: inherit;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.book-source-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(15, 23, 42, 0.08);
}

.book-source-card.active {
  border-color: #4F46E5;
  background: #EEF2FF;
}

.book-source-card-icon {
  flex-shrink: 0;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.9rem;
  border-radius: 14px;
  background: #FFFFFF;
  box-shadow: 0 2px 6px rgba(15, 23, 42, 0.08);
}

.book-source-card-text {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  min-width: 0;
}

.book-source-card-title {
  font-size: 1rem;
  font-weight: 800;
}

.book-source-card-sub {
  font-size: 0.8rem;
  font-weight: 500;
  opacity: 0.8;
}

.book-source-card-primary {
  padding: 1.35rem 1.5rem;
  border-color: transparent;
  background: linear-gradient(135deg, #FB923C 0%, #F43F5E 55%, #A855F7 100%);
  color: #FFFFFF;
  box-shadow: 0 8px 20px rgba(244, 63, 94, 0.25);
}

.book-source-card-primary .book-source-card-icon {
  width: 76px;
  height: 76px;
  font-size: 2.8rem;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.95);
}

.book-source-card-primary .book-source-card-title {
  font-size: 1.35rem;
}

.book-source-card-primary .book-source-card-sub {
  font-size: 0.88rem;
  opacity: 0.95;
}

.book-source-card-primary.active {
  border-color: #FFFFFF;
  background: linear-gradient(135deg, #FB923C 0%, #F43F5E 55%, #A855F7 100%);
  box-shadow: 0 0 0 3px #F43F5E, 0 10px 24px rgba(244, 63, 94, 0.3);
}

.book-source-card-primary:not(.active) {
  opacity: 0.85;
}

.book-source-card-badge {
  position: absolute;
  top: 0.6rem;
  right: 0.75rem;
  padding: 0.15rem 0.55rem;
  border-radius: var(--radius-full);
  background: #FFFFFF;
  color: #F43F5E;
  font-size: 0.7rem;
  font-weight: 800;
}

.book-source-detail {
  margin-top: 1rem;
}

.custom-book-fields {
  display: grid;
  grid-template-columns: 2fr 1.2fr;
  gap: 0.75rem;
}

.custom-book-fields input {
  padding: 0.85rem 1rem;
  border: 2px solid #FDA4AF;
  border-radius: 12px;
  background: #FFF1F2;
  font-size: 1rem;
  font-weight: 700;
  font-family: inherit;
  outline: none;
}

.custom-book-fields input:focus {
  border-color: #F43F5E;
  background: #FFFFFF;
}

@media (max-width: 640px) {
  .book-source-cards,
  .custom-book-fields {
    grid-template-columns: 1fr;
  }
}

/* ============================================================
   Torn Grid Paper Worksheet Styling (PDF Pages 1 ~ 8)
============================================================ */
.worksheet-card {
  background: #FFFFFF;
  border: 1px solid #CBD5E1;
  border-radius: 20px;
  padding: 2.5rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.06);
  position: relative;
  margin-bottom: 3rem;
}

.worksheet-title-area {
  text-align: center;
  margin-bottom: 2rem;
  border-bottom: 2px solid #E2E8F0;
  padding-bottom: 1.25rem;
}

.worksheet-main-title {
  font-size: 1.9rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: #1E293B;
  margin-bottom: 0.35rem;
}

.worksheet-sub-title {
  font-size: 1rem;
  font-weight: 700;
  color: #64748B;
}

/* Torn Grid Memo Note Block */
.torn-paper-box {
  background: #FAFBFD;
  background-image: 
    linear-gradient(#E2E8F0 1px, transparent 1px),
    linear-gradient(90deg, #E2E8F0 1px, transparent 1px);
  background-size: 20px 20px;
  border: 1px solid #CBD5E1;
  border-radius: 12px;
  padding: 1.75rem;
  margin-bottom: 1.5rem;
  position: relative;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
}

.torn-paper-box::before {
  content: '';
  position: absolute;
  top: -6px;
  left: 10px;
  right: 10px;
  height: 6px;
  background: repeating-linear-gradient(45deg, #CBD5E1, #CBD5E1 5px, transparent 5px, transparent 10px);
  opacity: 0.4;
}

.torn-page-tag {
  position: absolute;
  bottom: 1rem;
  right: 1.5rem;
  font-size: 0.85rem;
  font-weight: 700;
  color: #64748B;
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.page-num-input {
  width: 60px;
  text-align: center;
  border: none;
  border-bottom: 1px solid #64748B;
  background: transparent;
  font-weight: 700;
  font-size: 0.9rem;
  outline: none;
}

.worksheet-textarea {
  width: 100%;
  min-height: 90px;
  background: transparent;
  border: none;
  font-family: inherit;
  font-size: 1.05rem;
  line-height: 1.8;
  color: #1E293B;
  outline: none;
  resize: vertical;
}

/* 예시 문장(placeholder)은 옅은 회색 — 입력을 시작하면 자동으로 사라짐 */
.reading-container textarea::placeholder,
.reading-container input::placeholder {
  color: #B8C0CC;
  font-weight: 500;
  opacity: 1;
}

/* Worksheet Footer Student Meta */
.worksheet-meta-bar {
  display: grid;
  grid-template-columns: 2fr 1.5fr 1fr 1fr;
  gap: 1rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px dashed #CBD5E1;
  font-size: 0.9rem;
}

.worksheet-input-inline {
  width: 100%;
  border: none;
  border-bottom: 1.5px solid #94A3B8;
  padding: 0.3rem 0.5rem;
  font-weight: 700;
  font-size: 0.95rem;
  outline: none;
  background: transparent;
}

/* Template 2: 독서기록장 Checkboxes */
.reflection-checkboxes {
  display: flex;
  gap: 1.25rem;
  margin: 0.75rem 0 1.25rem;
  flex-wrap: wrap;
}

.rf-check-label {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  font-weight: 700;
  color: #334155;
  cursor: pointer;
}

.rf-check-label input {
  width: 18px;
  height: 18px;
  accent-color: #4F46E5;
}

/* Template 3: 퀴즈 만들기 (PDF p.3~4) */
.quiz-maker-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  border-right: 2px dashed #CBD5E1;
}

.quiz-half-col {
  padding: 0 1rem;
}

/* Feed */
.reading-feed-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1.5rem;
}

.reading-feed-card {
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-xs);
  transition: var(--transition-fast);
}

.reading-feed-card:hover {
  box-shadow: var(--shadow-sm);
  border-color: #CBD5E1;
}

@media (max-width: 860px) {
  .worksheet-card {
    padding: 1.5rem;
  }
  .worksheet-meta-bar {
    grid-template-columns: 1fr 1fr;
  }
}