/* ── 리셋 & 기본 ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg: #f0f4f8;
  --surface: #ffffff;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --accent: #0ea5e9;
  --success: #16a34a;
  --warning: #d97706;
  --danger: #dc2626;
  --text: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0,0,0,0.08);
}
body {
  font-family: system-ui, 'Apple SD Gothic Neo', 'Nanum Gothic', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

/* ── 레이아웃 ── */
header {
  background: linear-gradient(135deg, #1e40af 0%, #0369a1 100%);
  color: white;
  padding: 28px 24px;
  text-align: center;
  box-shadow: 0 2px 12px rgba(30,64,175,0.3);
}
header h1 { font-size: 1.7rem; font-weight: 700; letter-spacing: -0.5px; }
header p  { margin-top: 6px; font-size: 0.95rem; opacity: 0.85; }

main {
  max-width: 860px;
  margin: 32px auto;
  padding: 0 16px 60px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* ── 카드 ── */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}
.card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.card-title::before {
  content: '';
  display: inline-block;
  width: 4px; height: 18px;
  background: var(--primary);
  border-radius: 2px;
}

/* ── 폼 요소 ── */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
@media (max-width: 600px) { .form-grid { grid-template-columns: 1fr; } }

label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.file-drop {
  border: 2px dashed var(--border);
  border-radius: 10px;
  padding: 24px 16px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  position: relative;
}
.file-drop:hover, .file-drop.drag-over {
  border-color: var(--primary);
  background: #eff6ff;
}
.file-drop input[type="file"] {
  position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; height: 100%;
}
.file-drop .icon { font-size: 2rem; margin-bottom: 8px; }
.file-drop .hint { font-size: 0.8rem; color: var(--text-muted); margin-top: 4px; }
.file-drop .filename {
  font-size: 0.85rem; color: var(--success); font-weight: 600; margin-top: 6px;
}

/* ── 드롭다운 (LLM 제공사 / 모델 공용) ── */
.select-field {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--text);
  background: var(--surface);
  cursor: pointer;
  transition: border-color 0.2s;
}
.select-field:hover { border-color: var(--primary); }
.select-field:focus { outline: none; border-color: var(--primary); }
.select-field:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

input[type="text"], input[type="password"], input[type="number"] {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--text);
  transition: border-color 0.2s;
  background: var(--surface);
}
input:focus { outline: none; border-color: var(--primary); }

.count-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 20px;
}
.count-row label { margin: 0; white-space: nowrap; }
.count-row input[type="number"] { width: 80px; }
.count-row span { font-size: 0.8rem; color: var(--text-muted); }

/* ── 버튼 ── */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px;
  padding: 13px 32px;
  border: none; border-radius: 10px;
  font-size: 1rem; font-weight: 700; font-family: inherit;
  cursor: pointer; transition: all 0.2s;
}
.btn-primary {
  background: var(--primary);
  color: white;
  width: 100%; margin-top: 24px;
}
.btn-primary:hover:not(:disabled) { background: var(--primary-dark); transform: translateY(-1px); }
.btn-primary:disabled { opacity: 0.55; cursor: not-allowed; transform: none; }

/* ── 진행 상태 ── */
#status-box {
  display: none;
  border-radius: 10px;
  padding: 20px 24px;
  background: #eff6ff;
  border: 1.5px solid #bfdbfe;
}
.step-list { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.step-item {
  display: flex; align-items: center; gap: 12px;
  font-size: 0.92rem;
}
.step-icon { font-size: 1.1rem; width: 24px; text-align: center; }
.step-item.done  .step-text { color: var(--success); }
.step-item.active .step-text { color: var(--primary); font-weight: 600; }
.step-item.wait  .step-text { color: var(--text-muted); }

/* ── 개념/패턴 요약 ── */
#analysis-box { display: none; }
.tag-group { margin-bottom: 12px; }
.tag-group-label { font-size: 0.78rem; font-weight: 700; color: var(--text-muted); margin-bottom: 6px; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag {
  display: inline-block; padding: 4px 10px;
  border-radius: 999px; font-size: 0.78rem; font-weight: 600;
}
.tag-blue   { background: #dbeafe; color: #1d4ed8; }
.tag-green  { background: #dcfce7; color: #15803d; }
.tag-orange { background: #ffedd5; color: #c2410c; }
.tag-purple { background: #ede9fe; color: #7c3aed; }

/* ── 문제 카드 ── */
#result-box { display: none; }
.question-card {
  background: var(--surface);
  border-radius: var(--radius);
  border: 1.5px solid var(--border);
  padding: 24px;
  margin-bottom: 16px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}
.q-number {
  font-size: 0.78rem; font-weight: 700;
  color: white; background: var(--primary);
  padding: 3px 10px; border-radius: 999px;
  display: inline-block; margin-bottom: 14px;
}
.type-badge {
  font-size: 0.72rem; font-weight: 700;
  padding: 2px 9px; border-radius: 999px;
  margin-left: 6px; vertical-align: middle;
}
.type-obj   { background: #dbeafe; color: #1d4ed8; }  /* 객관식 */
.type-blank { background: #dcfce7; color: #15803d; }  /* 빈칸 채우기 */
.type-short { background: #fef3c7; color: #b45309; }  /* 단답형 */
.type-essay { background: #ede9fe; color: #7c3aed; }  /* 서술형 */
.type-subj  { background: #ede9fe; color: #7c3aed; }  /* (구) 주관식 폴백 */
.q-text { font-size: 0.97rem; line-height: 1.7; white-space: pre-wrap; }
.q-image {
  max-width: 100%; max-height: 300px;
  border: 1.5px solid var(--border); border-radius: 10px; background: #fff;
}
.subj-input {
  width: 100%; margin-top: 14px;
  padding: 12px 14px;
  border: 1.5px solid var(--border); border-radius: 8px;
  font-size: 0.92rem; font-family: inherit; color: var(--text);
  line-height: 1.6; resize: vertical;
}
.subj-input:focus { outline: none; border-color: var(--primary); }
.blank-input-row { display: flex; flex-direction: column; gap: 10px; margin-top: 14px; }
.blank-input-item { display: flex; align-items: center; gap: 10px; }
.blank-input-item .blank-label {
  flex-shrink: 0; font-size: 0.85rem; font-weight: 700; color: var(--accent);
  min-width: 52px;
}
.blank-input {
  flex: 1; padding: 9px 12px;
  border: 1.5px solid var(--border); border-radius: 8px;
  font-size: 0.92rem; font-family: inherit; color: var(--text);
}
.blank-input:focus { outline: none; border-color: var(--primary); }
.blank-input.correct { background: #dcfce7; border-color: var(--success); color: var(--success); font-weight: 700; }
.blank-input.wrong   { background: #fee2e2; border-color: var(--danger); color: var(--danger); }
.choices { list-style: none; margin-top: 14px; display: flex; flex-direction: column; gap: 8px; }
.choices li {
  padding: 10px 14px;
  border-radius: 8px; border: 1.5px solid var(--border);
  font-size: 0.92rem; cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}
.choices li:hover { background: #eff6ff; border-color: var(--accent); }
.choices li.selected { background: #dbeafe; border-color: var(--primary); }
.choices li.correct  { background: #dcfce7; border-color: var(--success); color: var(--success); font-weight: 700; }
.choices li.wrong    { background: #fee2e2; border-color: var(--danger); color: var(--danger); }

.answer-section { margin-top: 16px; display: none; }
.answer-section .answer-badge {
  display: inline-block; padding: 4px 12px;
  background: #dcfce7; color: var(--success);
  border-radius: 999px; font-size: 0.82rem; font-weight: 700;
  margin-bottom: 10px;
}
.explain-box {
  background: #f8fafc; border-left: 4px solid var(--primary);
  padding: 14px 16px; border-radius: 0 8px 8px 0;
  font-size: 0.88rem; line-height: 1.7;
  white-space: pre-wrap;
}
.trap-box {
  margin-top: 10px;
  background: #fffbeb; border-left: 4px solid var(--warning);
  padding: 14px 16px; border-radius: 0 8px 8px 0;
  font-size: 0.88rem; line-height: 1.7;
}
.trap-box strong { color: var(--warning); }

.check-btn {
  margin-top: 12px; padding: 8px 20px;
  border: 1.5px solid var(--primary); border-radius: 8px;
  background: white; color: var(--primary);
  font-size: 0.88rem; font-weight: 600; cursor: pointer;
  transition: all 0.15s;
}
.check-btn:hover { background: var(--primary); color: white; }

/* ── 에러 ── */
.error-box {
  background: #fee2e2; border: 1.5px solid #fca5a5;
  border-radius: 10px; padding: 16px 20px;
  color: var(--danger); font-size: 0.92rem;
  display: none;
}

/* ── 문제 헤더 (번호 + 오답 버튼) ── */
.q-header {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 14px; flex-wrap: wrap;
}
.q-header .q-number { margin-bottom: 0; }
.wrong-add-btn {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 4px 10px; border-radius: 999px;
  border: 1.5px solid #fca5a5; background: #fff;
  color: var(--danger); font-size: 0.76rem; font-weight: 700;
  font-family: inherit; cursor: pointer; transition: all 0.15s;
  margin-left: auto;
}
.wrong-add-btn:hover { background: var(--danger); color: #fff; border-color: var(--danger); }
.wrong-add-btn.saved { background: #fee2e2; color: var(--danger); cursor: default; }
.wrong-remove-btn {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 4px 10px; border-radius: 999px;
  border: 1.5px solid var(--border); background: #fff;
  color: var(--text-muted); font-size: 0.76rem; font-weight: 700;
  font-family: inherit; cursor: pointer; transition: all 0.15s;
  margin-left: auto;
}
.wrong-remove-btn:hover { background: #fee2e2; color: var(--danger); border-color: #fca5a5; }

/* ── 상단 탭 ── */
.tabs {
  max-width: 860px; margin: 24px auto 0; padding: 0 16px;
  display: flex; gap: 8px;
}
.tab-btn {
  flex: 1; padding: 13px 16px;
  border: 1px solid var(--border); border-bottom: none;
  border-radius: 12px 12px 0 0;
  background: #e2e8f0; color: var(--text-muted);
  font-size: 0.98rem; font-weight: 700; font-family: inherit;
  cursor: pointer; transition: all 0.15s;
}
.tab-btn:hover { background: #d7dfea; }
.tab-btn.active {
  background: var(--surface); color: var(--primary);
  box-shadow: 0 -3px 10px rgba(0,0,0,0.05);
}
main { margin-top: 20px; }
.hidden { display: none !important; }
/* 탭 패널 / 서브뷰 안의 카드들도 세로 간격 유지 */
.tab-panel, #gen-input-view, #gen-result-view, #wrong-view {
  display: flex; flex-direction: column; gap: 24px;
}

/* ── 결과 페이지 네비게이션 ── */
.result-nav {
  display: flex; align-items: center; justify-content: space-between;
  gap: 10px; margin-bottom: 16px; flex-wrap: wrap;
}
.back-btn {
  padding: 9px 16px; border: 1.5px solid var(--border); border-radius: 10px;
  background: var(--surface); color: var(--text); font-size: 0.9rem; font-weight: 700;
  font-family: inherit; cursor: pointer; transition: all 0.15s;
}
.back-btn:hover { border-color: var(--primary); color: var(--primary); }
.btn-ghost {
  padding: 9px 16px; border: 1.5px solid var(--primary); border-radius: 10px;
  background: var(--primary); color: #fff; font-size: 0.9rem; font-weight: 700;
  font-family: inherit; cursor: pointer; transition: all 0.15s;
}
.btn-ghost:hover { background: var(--primary-dark); }

/* ── 분석 결과: 접을 수 있는 세부 항목 ── */
.a-section {
  border: 1.5px solid var(--border); border-radius: 10px;
  margin-bottom: 12px; overflow: hidden; background: var(--surface);
}
.a-section > summary {
  list-style: none; cursor: pointer;
  padding: 12px 16px; font-size: 0.9rem; font-weight: 700; color: var(--text);
  display: flex; align-items: center; gap: 8px;
  background: #f8fafc; transition: background 0.15s;
}
.a-section > summary::-webkit-details-marker { display: none; }
.a-section > summary::after {
  content: '▸'; margin-left: auto; color: var(--text-muted);
  transition: transform 0.15s; font-size: 0.9rem;
}
.a-section[open] > summary { border-bottom: 1px solid var(--border); }
.a-section[open] > summary::after { transform: rotate(90deg); }
.a-section:hover > summary { background: #eef2f7; }
.a-section .a-body { padding: 14px 16px; }

/* ── 오답 노트 모달 ── */
.modal-overlay {
  display: none; position: fixed; inset: 0; z-index: 1000;
  background: rgba(15,23,42,0.45);
  align-items: center; justify-content: center; padding: 20px;
}
.modal-overlay.open { display: flex; }
.modal {
  background: var(--surface); border-radius: var(--radius);
  box-shadow: 0 12px 40px rgba(0,0,0,0.25);
  width: 100%; max-width: 460px; max-height: 85vh;
  overflow-y: auto; padding: 24px;
}
.modal h3 { font-size: 1.05rem; color: var(--text); margin-bottom: 4px; }
.modal .modal-sub { font-size: 0.8rem; color: var(--text-muted); margin-bottom: 16px; }
.modal .q-preview {
  background: #f8fafc; border: 1px solid var(--border); border-radius: 8px;
  padding: 10px 12px; font-size: 0.82rem; color: var(--text-muted);
  line-height: 1.5; margin-bottom: 16px;
  max-height: 80px; overflow: hidden;
}
.folder-pick {
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
  padding: 10px 12px; border: 1.5px solid var(--border); border-radius: 8px;
  margin-bottom: 8px; cursor: pointer; transition: all 0.15s;
}
.folder-pick:hover { border-color: var(--danger); background: #fef2f2; }
.folder-pick .fp-name { font-weight: 600; font-size: 0.9rem; color: var(--text); }
.folder-pick .fp-count { font-size: 0.76rem; color: var(--text-muted); }
.modal .new-folder-row { display: flex; gap: 8px; margin-top: 14px; }
.modal .new-folder-row input { flex: 1; }
.modal .btn-danger {
  padding: 10px 16px; border: none; border-radius: 8px;
  background: var(--danger); color: #fff; font-weight: 700; font-size: 0.85rem;
  font-family: inherit; cursor: pointer; white-space: nowrap;
}
.modal .btn-danger:hover { background: #b91c1c; }
.modal .modal-close {
  margin-top: 18px; width: 100%; padding: 10px;
  border: 1px solid var(--border); border-radius: 8px; background: #fff;
  color: var(--text-muted); font-size: 0.85rem; font-family: inherit; cursor: pointer;
}
.modal .divider { text-align: center; font-size: 0.76rem; color: #94a3b8; margin: 14px 0 4px; }

/* ── 원본 텍스트 폴드 ── */
details { margin-top: 12px; }
details summary {
  font-size: 0.82rem; color: var(--text-muted); cursor: pointer;
  padding: 6px 0;
}
details pre {
  margin-top: 8px; background: #f1f5f9;
  border-radius: 8px; padding: 14px;
  font-size: 0.8rem; line-height: 1.6;
  white-space: pre-wrap; overflow-x: auto;
}