/* =========================================================================
   examples/css/example.css — 읽기 자료 (개념 설명 + 비유)
   ========================================================================= */

: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 ---- */
.header {
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
  position: relative;
}
.header .session-num {
  display: inline-block;
  padding: 4px 14px;
  background: linear-gradient(135deg, var(--accent), #d97706);
  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: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.header .subtitle {
  color: var(--text-muted);
  margin: 0.2rem 0 0;
}

/* 버전 뱃지 (마일스톤 차시) */
.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 (전체 흐름도에서 이번 차시가 닿는 부분 강조) ---- */
.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: 1.2rem 1.4rem;
  margin: 0 0 2rem;
}
.minimap .minimap-title {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--blue);
  font-weight: 700;
  margin-bottom: 0.8rem;
}
.minimap .flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
}
.minimap .box {
  padding: 6px 12px;
  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);
  box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.15);
  font-weight: 700;
}
.minimap .arrow { color: var(--blue); font-weight: 700; }

/* ---- 용어 사전 ---- */
.terms {
  background: var(--surface);
  border-radius: 12px;
  padding: 1.4rem 1.6rem;
  margin: 0 0 2rem;
}
.terms h3 {
  margin: 0 0 1rem;
  color: var(--accent);
  font-size: 1.05rem;
}
.term-item {
  display: grid;
  grid-template-columns: minmax(140px, 200px) 1fr;
  gap: 1rem;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--border);
}
.term-item:last-child { border-bottom: none; }
.term-name {
  color: var(--accent);
  font-weight: 700;
}
.term-desc { color: var(--text); }

/* ---- 본문 제목 ---- */
h2 {
  font-size: 1.5rem;
  color: var(--blue);
  margin: 2.4rem 0 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid rgba(59, 130, 246, 0.3);
}
h3 {
  font-size: 1.15rem;
  color: var(--green);
  margin: 1.6rem 0 0.6rem;
}

p { margin: 0.6rem 0; }
ul, ol { padding-left: 1.4rem; }
li { margin: 0.3rem 0; }
strong { color: var(--accent); }

/* ---- 박스 4종 ---- */
.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); }

/* ---- 4단계 패턴 ---- */
.pain-point {
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.1), rgba(239, 68, 68, 0.02));
  border: 2px dashed var(--red);
  border-radius: 12px;
  padding: 1rem 1.4rem;
  margin: 1.2rem 0;
}
.pain-point .pain-title {
  color: var(--red);
  font-weight: 700;
  margin-bottom: 0.4rem;
}
.pain-point .pain-title::before { content: '⚠️ '; }

.new-tool {
  background: linear-gradient(135deg, rgba(34, 197, 94, 0.1), rgba(34, 197, 94, 0.02));
  border: 2px solid var(--green);
  border-radius: 12px;
  padding: 1rem 1.4rem;
  margin: 1.2rem 0;
}
.new-tool .tool-title {
  color: var(--green);
  font-weight: 700;
  margin-bottom: 0.4rem;
}
.new-tool .tool-title::before { content: '🛠️ '; }

.before-after {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1rem;
  margin: 1.2rem 0;
}
.before-after .before, .before-after .after {
  padding: 1rem 1.2rem;
  border-radius: 10px;
}
.before-after .before {
  background: rgba(239, 68, 68, 0.08);
  border: 1px solid rgba(239, 68, 68, 0.3);
}
.before-after .after {
  background: rgba(34, 197, 94, 0.08);
  border: 1px solid rgba(34, 197, 94, 0.3);
}
.before-after .arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  color: var(--accent);
}
.before-after .label {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  margin-bottom: 0.4rem;
}
.before .label { color: var(--red); }
.after .label  { color: var(--green); }

/* ---- 다이어그램 (텍스트 아트) ---- */
.diagram {
  font-family: 'JetBrains Mono', monospace;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.2rem 1.4rem;
  white-space: pre;
  font-size: 13px;
  line-height: 1.6;
  overflow-x: auto;
  margin: 1.2rem 0;
}

/* ---- 2단 레이아웃 ---- */
.columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
  margin: 1.2rem 0;
}

/* ---- 코드 블록 (인라인 / 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: 1.2rem;
  margin: 1.2rem 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: 0.4rem;
}

/* ---- 네비게이션 ---- */
.nav {
  display: flex;
  justify-content: space-between;
  gap: 0.8rem;
  margin-top: 4rem;
  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(--accent);
  color: var(--accent);
  transform: translateY(-1px);
}

/* ---- 반응형 ---- */
@media (max-width: 768px) {
  .container { padding: 2rem 1rem 3rem; }
  .header h1 { font-size: 1.6rem; }
  .columns { grid-template-columns: 1fr; }
  .before-after { grid-template-columns: 1fr; }
  .before-after .arrow { transform: rotate(90deg); }
  .term-item { grid-template-columns: 1fr; gap: 0.2rem; }
}