/* ─────────────────────────────────────────────────────────
   Claude Cowork — 강의 교안 디자인 시스템
   톤: 동아리·1인 콘텐츠 운영자 친화 · 인디고+앰버
   ───────────────────────────────────────────────────────── */

:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-soft: #eef2ff;
  --accent: #f59e0b;
  --accent-soft: #fef3c7;
  --wow: #ec4899;
  --wow-soft: #fce7f3;
  --ok: #16a34a;
  --warn: #d97706;
  --danger: #dc2626;

  --bg: #fafaf9;
  --bg-card: #ffffff;
  --bg-soft: #f4f4f5;
  --bg-code: #0f172a;

  --text: #1e293b;
  --text-soft: #475569;
  --text-muted: #94a3b8;

  --border: #e2e8f0;
  --border-soft: #f1f5f9;

  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 16px;

  --shadow-sm: 0 1px 2px rgba(15,23,42,0.06);
  --shadow: 0 4px 12px rgba(15,23,42,0.08);
  --shadow-md: 0 10px 30px rgba(15,23,42,0.10);
  --shadow-lg: 0 20px 60px rgba(15,23,42,0.18);

  --font-sans: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, 'Apple SD Gothic Neo', 'Noto Sans KR', sans-serif;
  --font-mono: 'JetBrains Mono', 'D2Coding', ui-monospace, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

/* ── 공통 컴포넌트 ── */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.tag.wow { background: var(--wow-soft); color: var(--wow); }
.tag.primary { background: var(--primary-soft); color: var(--primary-dark); }
.tag.accent { background: var(--accent-soft); color: var(--warn); }
.tag.ok { background: #dcfce7; color: var(--ok); }

.kbd {
  display: inline-block;
  padding: 2px 8px;
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 4px;
  background: var(--bg-card);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-soft);
}

.code-block {
  background: var(--bg-code);
  color: #f1f5f9;
  padding: 14px 18px;
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  overflow-x: auto;
}
.code-block .c-hl { color: var(--accent); }
.code-block .c-mute { color: #64748b; }

.prompt-box {
  background: var(--primary-soft);
  border-left: 4px solid var(--primary);
  padding: 14px 18px;
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--text);
  white-space: pre-wrap;
}
.prompt-box .label {
  display: block;
  font-family: var(--font-sans);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--primary-dark);
  margin-bottom: 6px;
  text-transform: uppercase;
}

.wow-callout {
  background: linear-gradient(135deg, var(--wow-soft), var(--accent-soft));
  border-radius: var(--radius-lg);
  padding: 18px 22px;
  font-weight: 600;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 12px;
}
.wow-callout .emoji { font-size: 28px; flex-shrink: 0; }

.tip {
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  padding: 10px 14px;
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 13px;
  color: var(--text-soft);
}
.tip strong { color: var(--text); }

.checklist {
  list-style: none;
  padding: 0;
  margin: 0;
}
.checklist li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 6px 0;
  font-size: 14px;
}
.checklist li::before {
  content: '☐';
  font-size: 16px;
  color: var(--primary);
  flex-shrink: 0;
  margin-top: -1px;
}

/* ── 슬라이드 시스템 (16:9 · scroll-snap) ── */
.slide-deck {
  scroll-snap-type: y mandatory;
  overflow-y: auto;
  height: 100vh;
}
.slide {
  scroll-snap-align: start;
  width: 100%;
  height: 100vh;
  min-height: 720px;
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  position: relative;
  padding: 60px 80px 48px;
  border-bottom: 1px dashed var(--border);
  /* fade-in 진입 효과 */
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.slide.is-visible {
  opacity: 1;
  transform: translateY(0);
}
.slide.is-visible .slide-inner > * {
  animation: slideInner-rise 0.6s ease both;
}
.slide.is-visible .slide-inner > *:nth-child(2) { animation-delay: 0.08s; }
.slide.is-visible .slide-inner > *:nth-child(3) { animation-delay: 0.16s; }
.slide.is-visible .slide-inner > *:nth-child(4) { animation-delay: 0.24s; }
.slide.is-visible .slide-inner > *:nth-child(5) { animation-delay: 0.32s; }
@keyframes slideInner-rise {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ── 타이프라이터 ── */
.typewriter {
  position: relative;
}
.typewriter-content {
  display: inline;
}
.typewriter.is-typing .typewriter-content::after {
  content: '▊';
  color: var(--primary);
  animation: cursor-blink 0.7s infinite;
  margin-left: 1px;
}
@keyframes cursor-blink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

/* ── 인터랙티브 모형 강조 힌트 ── */
.interactive-hint {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: var(--wow);
  color: white;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.04em;
  padding: 3px 8px;
  border-radius: 999px;
  text-transform: uppercase;
  position: absolute;
  top: -8px;
  right: 12px;
  z-index: 2;
  animation: pulse-hint 2s ease-in-out infinite;
}
@keyframes pulse-hint {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.08); }
}
.slide-inner {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 24px;
  max-width: 1100px;
  margin: 0 auto;
  width: 100%;
}
.slide-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--text);
}
.slide-header .left { display: flex; align-items: baseline; gap: 12px; }
.slide-header .period {
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--text-muted);
  letter-spacing: 0.08em;
}
.slide-header .chapter {
  font-size: 13px;
  font-weight: 700;
  color: var(--primary);
}
.slide-header .num {
  font-size: 13px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}
.slide h1.title {
  font-size: 44px;
  font-weight: 900;
  letter-spacing: -0.025em;
  line-height: 1.15;
  margin: 0;
}
.slide h1.title .em { color: var(--primary); }
.slide h1.title .wow-em { color: var(--wow); }
.slide h2.subtitle {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-soft);
  margin: 0;
  letter-spacing: -0.01em;
}
.slide h3.section {
  font-size: 28px;
  font-weight: 800;
  margin: 0;
  letter-spacing: -0.02em;
}
.slide p.body { font-size: 17px; color: var(--text-soft); margin: 0; }
.slide p.body strong { color: var(--text); }

.slide-footer {
  position: absolute;
  bottom: 18px;
  left: 80px;
  right: 80px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 11px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* 슬라이드 1번 (타이틀)용 */
.slide.title-slide {
  background: linear-gradient(135deg, #1e1b4b 0%, #4338ca 100%);
  color: white;
}
.slide.title-slide h1.title { color: white; font-size: 64px; }
.slide.title-slide h2.subtitle { color: #c7d2fe; }
.slide.title-slide .slide-header { border-bottom-color: #818cf8; }
.slide.title-slide .slide-header .chapter { color: #fcd34d; }
.slide.title-slide .slide-header .period,
.slide.title-slide .slide-header .num,
.slide.title-slide .slide-footer { color: #a5b4fc; }

/* 와우 슬라이드용 (실습 시작 알림) */
.slide.wow-slide {
  background: linear-gradient(135deg, var(--wow-soft) 0%, var(--accent-soft) 100%);
}

/* 콘텐츠 레이아웃 헬퍼 */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.three-col { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.split-7-5 { display: grid; grid-template-columns: 7fr 5fr; gap: 32px; }

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px 24px;
  box-shadow: var(--shadow-sm);
}
.card.elev { box-shadow: var(--shadow-md); }
.card h4 { font-size: 16px; margin: 0 0 10px; font-weight: 700; }
.card .icon { font-size: 36px; margin-bottom: 8px; }

.step-list { display: flex; flex-direction: column; gap: 14px; counter-reset: step; }
.step-list .step {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 14px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  counter-increment: step;
}
.step-list .step::before {
  content: counter(step);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--primary);
  color: white;
  font-weight: 800;
  font-family: var(--font-mono);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.step-list .step .body { flex: 1; font-size: 15px; }
.step-list .step .body strong { display: block; margin-bottom: 4px; font-size: 16px; }

/* 인쇄·캡처 */
@media print {
  body { background: white; }
  .slide { page-break-after: always; min-height: auto; height: auto; padding: 40px 50px; }
  .slide.title-slide { background: white; color: var(--text); }
  .slide.title-slide h1.title { color: var(--text); }
  .slide.title-slide h2.subtitle { color: var(--text-soft); }
}