/* 제본스의 역설 — Jevons' Paradox
 *
 * 다크 배경 + teal(효율) vs amber(소비) 대비
 * 역설의 충돌을 색상으로 표현
 */

@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@300;400;500;600;700&family=Space+Grotesk:wght@400;500;600;700&display=swap');

:root {
  /* Background */
  --background-color: #0a0a0f;
  --section-divider-bg: #0f1218;

  /* Typography */
  --heading-font: "Space Grotesk", "Noto Sans KR", sans-serif;
  --body-font: "Noto Sans KR", "Space Grotesk", sans-serif;
  --base-font-size: 32px;
  --text-size: 16pt;
  --h1-size: 48pt;
  --h2-size: 34pt;
  --h3-size: 22pt;
  --footnote-size: 11pt;

  /* Colors */
  --primary-color: #4ECDC4;     /* teal — 효율 */
  --secondary-color: #F7A940;   /* amber — 소비/증가 */
  --text-color: #e8e8e8;
  --muted-color: #8a8a9a;
  --line-color: #2a2a3a;

  /* Layout */
  --slide-padding: 60px;
  --slide-padding-top: 40px;
  --content-gap: 25px;

  /* Components */
  --box-radius: 8px;
  --box-bg: rgba(255, 255, 255, 0.05);
  --box-border: rgba(255, 255, 255, 0.1);
}

/* ===========================================
   BASE STYLES
   =========================================== */

.reveal-viewport {
  background-color: var(--background-color);
}

.reveal {
  font-family: var(--body-font);
  font-size: var(--base-font-size);
}

.reveal strong,
.reveal b {
  font-weight: bold;
}

.reveal h1,
.reveal h2,
.reveal h3,
.reveal h4,
.reveal h5,
.reveal h6 {
  font-family: var(--heading-font);
  text-transform: none;
  color: var(--text-color);
  font-weight: 600;
  line-height: 1.2;
}

.reveal h1 { font-size: var(--h1-size); }
.reveal h2 { font-size: var(--h2-size); margin-bottom: 0; }
.reveal h3 { font-size: var(--h3-size); }

.reveal p,
.reveal li,
.reveal td,
.reveal th,
.reveal blockquote {
  font-size: var(--text-size);
  color: var(--text-color);
  line-height: 1.6;
}

/* ===========================================
   LISTS
   =========================================== */

.reveal ul {
  list-style: none;
  padding-left: 0;
  margin: 15px 0;
}

.reveal ul li {
  position: relative;
  padding-left: 25px;
  margin-bottom: 10px;
}

.reveal ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 8px;
  height: 8px;
  background: var(--primary-color);
  border-radius: 50%;
}

.reveal ul ul li::before {
  background: var(--muted-color);
  width: 6px;
  height: 6px;
}

.reveal blockquote p {
  font-size: inherit;
}

/* ===========================================
   SLIDE LAYOUT
   =========================================== */

.reveal .slides section {
  height: 100%;
  display: flex !important;
  flex-direction: column !important;
  padding: var(--slide-padding-top) var(--slide-padding) var(--slide-padding) var(--slide-padding) !important;
  box-sizing: border-box;
  text-align: left;
}

.reveal .slides section.stack {
  padding: 0 !important;
}

.reveal .slides section > .content {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  padding-top: var(--content-gap);
  text-align: left;
}

.reveal .slides section > .footnote {
  position: absolute;
  bottom: 15px;
  left: var(--slide-padding);
  right: var(--slide-padding);
  font-size: var(--footnote-size);
  color: var(--muted-color);
}

/* ===========================================
   SECTION DIVIDERS
   =========================================== */

.reveal .slides section.section-divider {
  display: flex !important;
  flex-direction: column !important;
  justify-content: center !important;
  align-items: center !important;
  text-align: center;
}

.reveal-viewport.is-section-divider .slide-background.present {
  background-color: var(--section-divider-bg) !important;
}

.reveal .slides section.section-divider h1 {
  font-size: 52pt;
  text-align: center;
  color: var(--primary-color);
}

.reveal .slides section.section-divider p {
  font-size: 20pt;
  color: var(--muted-color);
}

/* ===========================================
   TEXT SIZE UTILITIES
   =========================================== */

.text-lg { font-size: 18pt !important; }
.text-xl { font-size: 20pt !important; }
.text-2xl { font-size: 24pt !important; }
.text-3xl { font-size: 28pt !important; }
.text-4xl { font-size: 32pt !important; }

.text-muted { color: var(--muted-color) !important; }
.text-center { text-align: center !important; }
.text-uppercase { text-transform: uppercase; letter-spacing: 0.1em; }
.font-light { font-weight: 300; }
.font-bold { font-weight: 600; }

/* ===========================================
   BLOCKQUOTES
   =========================================== */

.reveal blockquote {
  border-left: 4px solid var(--primary-color);
  padding-left: 20px;
  margin: 20px 0;
  font-style: italic;
  background: none;
  box-shadow: none;
  width: 100%;
  max-width: none;
}

.reveal blockquote cite {
  display: block;
  margin-top: 10px;
  font-style: normal;
  color: var(--muted-color);
}

/* ===========================================
   STAT BOX — 큰 숫자 + 라벨
   =========================================== */

.stat-box {
  background: var(--box-bg);
  border: 1px solid var(--box-border);
  border-radius: var(--box-radius);
  padding: 25px 20px;
  text-align: center;
}

.stat-box .number {
  font-family: var(--heading-font);
  font-size: 36pt;
  font-weight: 700;
  line-height: 1;
  margin-bottom: 8px;
}

.stat-box .label {
  font-size: 12pt;
  color: var(--muted-color);
}

/* ===========================================
   CONCEPT BOX — 아이콘 + 제목 + 설명
   =========================================== */

.concept-box {
  background: var(--box-bg);
  border: 1px solid var(--box-border);
  border-radius: var(--box-radius);
  padding: 25px;
}

.concept-box p {
  margin: 0;
}

/* ===========================================
   DECORATIVE — 상단 그라데이션 라인
   =========================================== */

.reveal .slides section:not(.section-divider)::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  opacity: 0.6;
}