/* =========================================================================
   labs/css/lab.css — 단계별 실습 가이드
   ========================================================================= */

:root {
  --bg: #0f172a;
  --surface: #1e293b;
  --surface-2: #273449;
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --accent: #f59e0b;
  --blue: #3b82f6;
  --green: #22c55e;
  --red: #ef4444;
  --purple: #a855f7;
  --teal: #14b8a6;
  --border: #475569;
  --code-bg: #0d1117;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: 'Pretendard', 'Pretendard Variable', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 920px;
  margin: 0 auto;
  padding: 3rem 2rem 5rem;
}

/* ---- 헤더 (초록 뱃지) ---- */
.header {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
  position: relative;
}
.header .badge {
  display: inline-block;
  padding: 4px 14px;
  background: linear-gradient(135deg, var(--green), #16a34a);
  color: white;
  font-weight: 700;
  font-size: 13px;
  border-radius: 999px;
  margin-bottom: 0.6rem;
  letter-spacing: 0.05em;
}
.header h1 {
  margin: 0.2rem 0;
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.header .subtitle {
  color: var(--text-muted);
  margin: 0.2rem 0 0;
}

.version-badge {
  position: absolute;
  top: 0;
  right: 0;
  padding: 6px 16px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), var(--red));
  color: white;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.05em;
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
}

/* ---- 미니맵 ---- */
.minimap {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(59, 130, 246, 0.02));
  border: 1px solid var(--blue);
  border-radius: 12px;
  padding: 1rem 1.4rem;
  margin: 0 0 2rem;
}
.minimap .minimap-title {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--blue);
  font-weight: 700;
  margin-bottom: 0.6rem;
}
.minimap .flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
}
.minimap .box {
  padding: 5px 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-muted);
}
.minimap .box.active {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(245, 158, 11, 0.1);
  font-weight: 700;
}
.minimap .arrow { color: var(--blue); font-weight: 700; }

/* ---- 사전 준비 ---- */
.prerequisites {
  border: 2px solid var(--accent);
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.1), rgba(245, 158, 11, 0.02));
  border-radius: 12px;
  padding: 1rem 1.4rem;
  margin: 0 0 2rem;
}
.prerequisites h3 {
  margin: 0 0 0.6rem;
  color: var(--accent);
  font-size: 1rem;
}
.prerequisites ul { margin: 0; padding-left: 1.2rem; }
.prerequisites li { margin: 0.2rem 0; }

/* ---- Step (실습 단계 카드) ---- */
.step {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: 12px;
  padding: 1.4rem 1.6rem;
  margin: 1.6rem 0;
}
.step-header {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 1rem;
}
.step-num {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), #d97706);
  color: white;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}
.step-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text);
}

/* ---- 예상 결과 박스 ---- */
.expected {
  background: rgba(34, 197, 94, 0.08);
  border: 1px solid var(--green);
  border-radius: 10px;
  padding: 0.8rem 1.1rem;
  margin: 1rem 0;
}
.expected-title {
  color: var(--green);
  font-weight: 700;
  margin-bottom: 0.3rem;
  font-size: 0.95rem;
}
.expected-title::before { content: '✅ '; }

/* ---- Checkpoint (디버깅 사고 체크) ---- */
.checkpoint {
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.12), rgba(168, 85, 247, 0.02));
  border: 1px dashed var(--purple);
  border-radius: 10px;
  padding: 0.8rem 1.1rem;
  margin: 1rem 0;
}
.checkpoint .check-title {
  color: var(--purple);
  font-weight: 700;
  margin-bottom: 0.3rem;
  font-size: 0.95rem;
  letter-spacing: 0.05em;
}
.checkpoint .check-title::before { content: '🔎 '; }
.checkpoint ul { margin: 0.3rem 0 0; padding-left: 1.2rem; }
.checkpoint li { margin: 0.2rem 0; }

/* ---- 박스 4종 (예제와 공유) ---- */
.box {
  border-left: 4px solid;
  padding: 0.8rem 1.1rem;
  margin: 1rem 0;
  background: var(--surface);
  border-radius: 0 10px 10px 0;
}
.box-info    { border-left-color: var(--blue); }
.box-tip     { border-left-color: var(--green); }
.box-warn    { border-left-color: var(--accent); }
.box-danger  { border-left-color: var(--red); }
.box .box-title { font-weight: 700; margin-bottom: 0.3rem; font-size: 0.95rem; }
.box-info    .box-title { color: var(--blue); }
.box-tip     .box-title { color: var(--green); }
.box-warn    .box-title { color: var(--accent); }
.box-danger  .box-title { color: var(--red); }

/* ---- 본문 ---- */
h2 {
  font-size: 1.5rem;
  color: var(--blue);
  margin: 2rem 0 0.8rem;
}
h3 {
  font-size: 1.1rem;
  color: var(--green);
  margin: 1.2rem 0 0.5rem;
}
p { margin: 0.5rem 0; }
strong { color: var(--accent); }

/* ---- 코드 블록 ---- */
code {
  font-family: 'JetBrains Mono', monospace;
  background: rgba(245, 158, 11, 0.12);
  color: var(--accent);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.92em;
}
pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.2rem;
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.55;
}
pre code {
  background: transparent;
  color: var(--text);
  padding: 0;
  font-size: inherit;
}

/* ---- 스크린샷 자리 ---- */
.screenshot {
  background: var(--surface);
  border: 2px dashed var(--border);
  border-radius: 10px;
  padding: 1rem;
  margin: 1rem 0;
  text-align: center;
}
.screenshot img { max-width: 100%; border-radius: 8px; }
.screenshot .label { color: var(--text-muted); font-size: 12px; letter-spacing: 0.12em; }
.screenshot .desc { color: var(--text); font-size: 14px; margin-top: 0.3rem; }

/* ---- 완료 체크리스트 ---- */
.checklist {
  background: var(--surface);
  border: 2px solid var(--green);
  border-radius: 12px;
  padding: 1.2rem 1.4rem;
  margin: 2.5rem 0 0;
}
.checklist h3 {
  margin: 0 0 0.8rem;
  color: var(--green);
  font-size: 1.05rem;
}
.check-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.4rem 0;
}
.check-item input[type="checkbox"] {
  width: 18px;
  height: 18px;
  cursor: pointer;
  accent-color: var(--green);
}

/* ---- 네비게이션 ---- */
.nav {
  display: flex;
  justify-content: space-between;
  gap: 0.8rem;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}
.nav a {
  flex: 1;
  text-align: center;
  padding: 0.8rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  transition: all 0.2s;
}
.nav a:hover {
  border-color: var(--green);
  color: var(--green);
  transform: translateY(-1px);
}

/* ---- 반응형 ---- */
@media (max-width: 768px) {
  .container { padding: 2rem 1rem 3rem; }
  .header h1 { font-size: 1.5rem; }
  .step { padding: 1rem 1.2rem; }
}