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

body {
  font-family: 'Segoe UI', sans-serif;
  background: #f0f4f8;
  min-height: 100vh;
}

/* Header */
.header {
  background: #fff;
  border-bottom: 1px solid #e2e8f0;
  padding: 0 32px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header-title {
  font-size: 18px;
  font-weight: 700;
  color: #1a202c;
}

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

.user-name {
  font-size: 14px;
  color: #4a5568;
}

.btn-profile,
.btn-logout {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 6px 14px;
  background: transparent;
  color: #718096;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  font-size: 13px;
  line-height: 1.2;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
}
.btn-profile:hover,
.btn-logout:hover { background: #f7fafc; }

/* Main */
.main {
  max-width: 1180px;
  margin: 0 auto;
  padding: 40px 24px;
}

/* Student Info Card */
.student-info-card {
  background: #fff;
  border-radius: 12px;
  padding: 24px 28px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.06);
  border: 1px solid #e2e8f0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 32px;
}

.student-meta {
  display: flex;
  align-items: center;
  gap: 16px;
}

.avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: #ebf4ff;
  color: #667eea;
  font-size: 20px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.student-name {
  font-size: 18px;
  font-weight: 700;
  color: #1a202c;
  margin-bottom: 4px;
}

.student-detail {
  font-size: 13px;
  color: #718096;
}

.btn-new-chat {
  padding: 10px 22px;
  background: #667eea;
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
  white-space: nowrap;
  flex-shrink: 0;
}
.btn-new-chat:hover     { background: #5a67d8; }
.btn-new-chat:disabled  { background: #a0aec0; cursor: not-allowed; }

.btn-header-academy {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 18px;
  text-decoration: none;
}

/* Section */
.section {
  background: #fff;
  border-radius: 12px;
  border: 1px solid #e2e8f0;
  box-shadow: 0 1px 4px rgba(0,0,0,0.06);
  overflow: hidden;
  margin-bottom: 24px;
}
.section:last-child { margin-bottom: 0; }

.section-header {
  padding: 20px 24px 16px;
  border-bottom: 1px solid #f0f4f8;
}

.section-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.section-title {
  font-size: 15px;
  font-weight: 700;
  color: #2d3748;
}

.section-title-large {
  font-size: 24px;
  letter-spacing: -0.03em;
}

.section-hint {
  display: block;
  font-size: 12px;
  color: #718096;
  margin-top: 6px;
}

/* Pending review (시험지 검증 대기) */
.pending-review-section {
  border: 1px solid #f6e05e;
  background: #fffbea;
}

.pending-review-list { padding: 8px 0; }

.pending-review-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 24px;
  cursor: pointer;
  transition: background 0.15s;
  border-bottom: 1px solid #fef3c7;
}
.pending-review-item:last-child { border-bottom: none; }
.pending-review-item:hover { background: #fff7d6; }

.pending-icon {
  font-size: 20px;
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  background: #fefcbf;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.pending-body { flex: 1; min-width: 0; }

.pending-title {
  font-size: 14px;
  font-weight: 600;
  color: #744210;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 3px;
}

.pending-meta { font-size: 12px; color: #975a16; }

.pending-cta {
  font-size: 12px;
  color: #744210;
  background: #faf089;
  padding: 4px 10px;
  border-radius: 999px;
  font-weight: 600;
  flex-shrink: 0;
}

/* Learning records / Conversation List */
.learning-records-section {
  background: transparent;
  border: none;
  box-shadow: none;
  overflow: visible;
}

.conversation-list {
  padding: 8px 0 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 16px;
}

.loading-placeholder {
  padding: 48px 24px;
  text-align: center;
  color: #a0aec0;
  font-size: 14px;
}

.empty-state {
  padding: 60px 24px;
  text-align: center;
  color: #a0aec0;
}

.empty-icon {
  font-size: 36px;
  margin-bottom: 12px;
}

.empty-state p {
  font-size: 14px;
  margin-bottom: 4px;
}

.empty-sub {
  font-size: 13px;
  color: #cbd5e0;
}

.learning-record-card {
  position: relative;
  min-height: 198px;
  border: 1px solid #e2e8f0;
  border-radius: 16px;
  background: #fff;
  padding: 22px;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s, border-color 0.15s;
  text-align: left;
  font: inherit;
}

.learning-record-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.10);
  border-color: #cbd5e0;
}

.learning-record-create {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 18px;
  background: #fff;
  color: #1a202c;
}
.learning-record-create:disabled {
  opacity: 0.65;
  cursor: wait;
  transform: none;
}
.learning-record-create.is-loading .create-title { color: transparent; position: relative; }
.learning-record-create.is-loading .create-title::after {
  content: '생성 중...';
  color: #718096;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  white-space: nowrap;
}

.create-plus {
  width: 58px;
  height: 58px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #eef2ff;
  color: #4f46e5;
  font-size: 34px;
  line-height: 1;
  font-weight: 300;
}

.create-title {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.conversation-item {
  display: flex;
  align-items: flex-start;
  flex-direction: column;
  gap: 16px;
}
.conversation-item.lesson-linked {
  background: #eaf7fb;
  border-color: #c7e8f0;
}
.conversation-item.lesson-linked:hover { background: #e2f3f8; }

.conv-icon {
  font-size: 36px;
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  background: transparent;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.conv-body {
  flex: 1;
  min-width: 0;
  width: 100%;
}

.conv-title {
  font-size: 20px;
  line-height: 1.25;
  font-weight: 700;
  color: #2d3748;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 10px;
  letter-spacing: -0.03em;
}

.conv-meta {
  font-size: 13px;
  color: #718096;
}

.conv-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 10px;
}

.conv-badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 8px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 700;
}
.conv-badge-personal {
  background: #edf2f7;
  color: #4a5568;
}
.conv-badge-lesson {
  background: #dbeafe;
  color: #1e40af;
}

.conv-lesson {
  font-size: 13px;
  color: #2b6cb0;
  margin-bottom: 8px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.conv-arrow {
  display: none;
}

.learning-record-menu {
  position: absolute;
  top: 14px;
  right: 14px;
  z-index: 3;
  width: 34px;
  height: 34px;
  border: none;
  border-radius: 999px;
  background: transparent;
  color: #718096;
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
}
.learning-record-menu:hover { background: #edf2f7; color: #2d3748; }

.conversation-card-menu {
  position: absolute;
  top: 48px;
  right: 14px;
  z-index: 10;
  min-width: 126px;
  padding: 6px;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  background: #fff;
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.16);
}
.conversation-card-menu[hidden] { display: none; }
.conversation-card-menu button {
  width: 100%;
  border: none;
  border-radius: 8px;
  background: transparent;
  padding: 9px 10px;
  color: #2d3748;
  font-size: 13px;
  font-weight: 700;
  text-align: left;
  cursor: pointer;
}
.conversation-card-menu button:hover { background: #edf2f7; }
.conversation-card-menu button.danger { color: #c53030; }
.conversation-card-menu button.danger:hover { background: #fff5f5; }

.conv-edit-label {
  display: block;
  margin-bottom: 8px;
  color: #4a5568;
  font-size: 13px;
  font-weight: 700;
}
.conv-edit-input {
  width: 100%;
  min-height: 46px;
  border: 1px solid #cbd5e0;
  border-radius: 10px;
  padding: 0 12px;
  font-size: 15px;
  outline: none;
}
.conv-edit-input:focus {
  border-color: #667eea;
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.14);
}

.learning-record-empty {
  grid-column: 1 / -1;
  min-height: 198px;
  border: 1px dashed #cbd5e0;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.7);
}

/* ── 받은 학습자료 (Phase 2 §5.5) ─────────────────────── */

.learning-materials-section {
  border: 1px solid #bee3f8;
  background: #ebf8ff;
}

.learning-materials-list { padding: 8px 0; }

.lm-item {
  padding: 14px 24px;
  border-bottom: 1px solid #d6ecfc;
}
.lm-item:last-child { border-bottom: none; }

.lm-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.lm-title-wrap {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  flex: 1;
  min-width: 0;
}

.lm-icon {
  font-size: 22px;
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  background: #bee3f8;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lm-title {
  font-size: 14px;
  font-weight: 700;
  color: #2c5282;
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.lm-meta {
  font-size: 12px;
  color: #4a5f7a;
}

.lm-status {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
  margin-left: 4px;
}
.lm-status-pending {
  background: #fefcbf;
  color: #744210;
}
.lm-status-done {
  background: #c6f6d5;
  color: #22543d;
}

.lm-actions {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

.lm-btn-small {
  padding: 6px 12px;
  border: 1px solid #bee3f8;
  border-radius: 6px;
  background: #fff;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
}
.lm-btn-download { color: #2c5282; }
.lm-btn-download:hover { background: #ebf8ff; }
.lm-btn-upload {
  background: #4299e1;
  color: #fff;
  border-color: #4299e1;
}
.lm-btn-upload:hover { background: #3182ce; }

.lm-desc {
  margin-top: 8px;
  margin-left: 48px;
  font-size: 13px;
  color: #4a5568;
  background: #fff;
  border: 1px solid #d6ecfc;
  border-radius: 6px;
  padding: 8px 12px;
  white-space: pre-wrap;
}

.lm-answers {
  margin-top: 8px;
  margin-left: 48px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.lm-answer-chip {
  display: inline-block;
  padding: 4px 10px;
  background: #fff;
  border: 1px solid #bee3f8;
  border-radius: 999px;
  font-size: 12px;
  color: #2c5282;
  text-decoration: none;
}
.lm-answer-chip:hover { background: #ebf8ff; }

/* ── 풀이 업로드 모달 ────────────────────────────────── */

.lm-modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}
.lm-modal-backdrop[hidden] { display: none; }

.lm-modal {
  background: #fff;
  border-radius: 12px;
  width: 92%;
  max-width: 520px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.25);
  display: flex;
  flex-direction: column;
}

.lm-modal-header {
  padding: 16px 20px;
  border-bottom: 1px solid #e2e8f0;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.lm-modal-header h3 {
  font-size: 16px;
  font-weight: 700;
  color: #2d3748;
  margin: 0;
}

.lm-modal-close {
  background: transparent;
  border: none;
  font-size: 24px;
  line-height: 1;
  color: #a0aec0;
  cursor: pointer;
}
.lm-modal-close:hover { color: #4a5568; }

.lm-modal-body {
  padding: 18px 20px;
}

.lm-modal-sub {
  font-size: 13px;
  color: #4a5568;
  margin: 0 0 14px 0;
  line-height: 1.5;
}

.lm-file-label {
  display: block;
  border: 1.5px dashed #cbd5e0;
  border-radius: 8px;
  padding: 18px;
  text-align: center;
  cursor: pointer;
  transition: all 0.15s;
}
.lm-file-label:hover {
  border-color: #4299e1;
  background: #ebf8ff;
}

.lm-file-label input[type="file"] { display: none; }

.lm-file-cta {
  font-size: 14px;
  font-weight: 600;
  color: #4299e1;
}

.lm-file-list {
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.lm-file-row {
  font-size: 13px;
  color: #4a5568;
  padding: 6px 10px;
  background: #f7fafc;
  border-radius: 4px;
}

.lm-file-size {
  color: #a0aec0;
  font-size: 12px;
}

.lm-modal-footer {
  padding: 14px 20px;
  border-top: 1px solid #e2e8f0;
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

.lm-btn {
  padding: 9px 18px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
}

.lm-btn-cancel {
  background: #fff;
  color: #4a5568;
  border-color: #e2e8f0;
}
.lm-btn-cancel:hover { background: #f7fafc; }

.lm-btn-primary {
  background: #4299e1;
  color: #fff;
}
.lm-btn-primary:hover:not(:disabled) { background: #3182ce; }
.lm-btn-primary:disabled {
  background: #a0aec0;
  cursor: not-allowed;
}


.lesson-applications-list { display: flex; flex-direction: column; gap: 10px; }
.lesson-application-item { background: #fff; border: 1px solid #e2e8f0; border-radius: 10px; padding: 14px; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.lesson-application-title { font-weight: 700; color: #2d3748; margin-bottom: 4px; }
.lesson-application-meta { font-size: 13px; color: #718096; }
.lesson-application-actions { display: flex; gap: 8px; flex-wrap: wrap; justify-content: flex-end; }
@media (max-width: 720px) {
  .header {
    height: auto;
    padding: 14px 20px;
    align-items: flex-start;
    gap: 12px;
  }
  .header-right {
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 8px;
  }
  .section-header-row {
    align-items: flex-start;
    flex-direction: column;
  }
  .student-info-card,
  .lesson-application-item {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* Mobile responsive baseline ===================================== */
@media (max-width: 768px) {
  body { overflow-x: hidden; }

  .header {
    height: auto;
    padding: 12px 16px;
    align-items: flex-start;
    gap: 12px;
  }

  .header img {
    height: 28px !important;
    flex-shrink: 0;
  }

  .header-right {
    width: 100%;
    justify-content: flex-start;
    flex-wrap: wrap;
    gap: 8px;
  }

  .user-name {
    width: 100%;
    order: -1;
  }

  .btn-new-chat,
  .btn-profile,
  .btn-logout {
    min-height: 40px;
    align-items: center;
    justify-content: center;
  }

  .main {
    padding: 20px 14px 32px;
  }

  .student-info-card {
    padding: 18px;
    margin-bottom: 22px;
  }

  .conversation-list {
    grid-template-columns: 1fr;
  }

  .learning-record-card {
    min-height: 168px;
    padding: 18px;
  }

  .section-title-large {
    font-size: 22px;
  }

  .section-header,
  .lm-item,
  .pending-review-item {
    padding-left: 16px;
    padding-right: 16px;
  }

  .pending-review-item,
  .lm-head,
  .lesson-application-item {
    align-items: flex-start;
    flex-direction: column;
  }

  .pending-cta,
  .lm-actions,
  .lesson-application-actions {
    width: 100%;
  }

  .lm-actions,
  .lesson-application-actions {
    justify-content: flex-start;
  }

  .lm-btn-small,
  .lm-btn {
    min-height: 38px;
  }

  .lm-desc,
  .lm-answers {
    margin-left: 0;
  }

  .lm-modal-backdrop {
    align-items: flex-end;
    padding: 10px;
  }

  .lm-modal {
    width: 100%;
    max-height: 92vh;
    overflow-y: auto;
  }

  .lm-modal-footer {
    position: sticky;
    bottom: 0;
    background: #fff;
  }
}

@media (max-width: 480px) {
  .main { padding-left: 12px; padding-right: 12px; }
  .student-info-card { padding: 16px; }
  .avatar { width: 42px; height: 42px; }
  .create-title { font-size: 18px; }
  .conv-title { font-size: 18px; }
  .section-title-large { font-size: 20px; }
}