/* ===================================
   GenAI Book - Custom Styles
   2026 Glassmorphism Edition
   =================================== */

/* 폰트 로드 */
@import url('https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/static/pretendard.min.css');
@import url('https://fonts.googleapis.com/css2?family=Syne:wght@600;700;800&display=swap');

/* 기본 폰트 설정 + CSS 변수 */
:root {
  --md-text-font: "Pretendard", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --md-code-font: "JetBrains Mono", "Fira Code", monospace;

  /* Glassmorphism 변수 */
  --glass-blur: 20px;
  --glass-saturation: 180%;
  --glass-border: rgba(255, 255, 255, 0.2);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);

  /* 트랜지션 */
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

body {
  font-family: var(--md-text-font);
}

/* ===================================
   라이트 모드 컬러 (현대화된 Blue)
   =================================== */
[data-md-color-scheme="default"] {
  /* 메인 배경색 - 더 밝고 따뜻하게 */
  --md-default-bg-color: #F8FAFC;
  --md-default-bg-color--light: #FFFFFF;
  --md-default-bg-color--lighter: #FAFBFC;
  --md-default-bg-color--lightest: #FFFFFF;

  /* 프라이머리 컬러 (APEX Navy) */
  --md-primary-fg-color: #1B2A4A;
  --md-primary-fg-color--light: #2D4A6F;
  --md-primary-fg-color--dark: #0F1D2F;
  --md-primary-bg-color: #FFFFFF;
  --md-primary-bg-color--light: #F0F3F7;

  /* 악센트 컬러 (APEX Gold) */
  --md-accent-fg-color: #B8960C;
  --md-accent-fg-color--transparent: rgba(200, 162, 74, 0.12);
  --md-accent-bg-color: #C8A24A;
  --md-accent-bg-color--light: #F5EFD7;

  /* 텍스트 컬러 - 더 부드럽게 */
  --md-typeset-color: #1E293B;
  --md-default-fg-color: #1E293B;
  --md-default-fg-color--light: #475569;
  --md-default-fg-color--lighter: #64748B;
  --md-default-fg-color--lightest: #94A3B8;

  /* 코드 배경 */
  --md-code-bg-color: #F1F5F9;
  --md-code-fg-color: #1E293B;

  /* 푸터 (APEX Navy) */
  --md-footer-bg-color: #0F1D2F;
  --md-footer-bg-color--dark: #0A1420;
  --md-footer-fg-color: #FFFFFF;
  --md-footer-fg-color--light: #C8D6E5;
  --md-footer-fg-color--lighter: #8FAFD4;

  /* Glassmorphism 라이트 */
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-bg-solid: rgba(255, 255, 255, 0.9);
  --glass-border: rgba(255, 255, 255, 0.5);
}

/* ===================================
   다크 모드 컬러
   =================================== */
[data-md-color-scheme="slate"] {
  /* 메인 배경색 - 더 깊은 slate */
  --md-default-bg-color: #0F172A;
  --md-default-bg-color--light: #1E293B;
  --md-default-bg-color--lighter: #334155;
  --md-default-bg-color--lightest: #475569;

  /* 프라이머리 컬러 (APEX Navy — 다크모드) */
  --md-primary-fg-color: #8FAFD4;
  --md-primary-fg-color--light: #A8C4E0;
  --md-primary-fg-color--dark: #6B9FD4;
  --md-primary-bg-color: #0F172A;
  --md-primary-bg-color--light: #1A2A42;

  /* 악센트 컬러 (APEX Gold — 다크모드) */
  --md-accent-fg-color: #D4AF37;
  --md-accent-fg-color--transparent: rgba(212, 175, 55, 0.15);

  /* 텍스트 컬러 */
  --md-typeset-color: #E2E8F0;
  --md-default-fg-color: #E2E8F0;
  --md-default-fg-color--light: #CBD5E1;
  --md-default-fg-color--lighter: #94A3B8;
  --md-default-fg-color--lightest: #64748B;

  /* 코드 배경 */
  --md-code-bg-color: #1E293B;
  --md-code-fg-color: #E2E8F0;

  /* Glassmorphism 다크 */
  --glass-bg: rgba(30, 41, 59, 0.7);
  --glass-bg-solid: rgba(30, 41, 59, 0.9);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

/* ===================================
   헤더 & 네비게이션 (Glassmorphism)
   =================================== */
.md-header {
  background: var(--glass-bg-solid);
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturation));
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturation));
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}

[data-md-color-scheme="default"] .md-header {
  background: rgba(27, 42, 74, 0.95);
}

[data-md-color-scheme="slate"] .md-header {
  background: rgba(15, 23, 42, 0.9);
}

.md-tabs {
  background: rgba(0, 0, 0, 0.1);
  backdrop-filter: blur(10px);
}

.md-tabs__link {
  font-weight: 500;
  opacity: 0.85;
  transition: var(--transition-smooth);
  border-radius: 8px;
  margin: 4px;
}

.md-tabs__link--active,
.md-tabs__link:hover {
  opacity: 1;
  background: rgba(255, 255, 255, 0.15);
}

/* ===================================
   레이아웃 너비 확장
   =================================== */
.md-grid {
  max-width: 1440px;
}

.md-main__inner {
  max-width: 100%;
}

/* ===================================
   사이드바 (Glassmorphism)
   =================================== */
.md-sidebar {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  width: 11rem;
}

.md-sidebar__scrollwrap {
  padding: 0.3rem;
}

.md-nav__link {
  font-size: 0.75rem;
  padding: 0.4rem 0.6rem;
  border-radius: 6px;
  transition: var(--transition-smooth);
  margin: 1px 0;
}

.md-nav__link:hover {
  background: var(--md-accent-fg-color--transparent);
  transform: translateX(2px);
}

.md-nav__link--active {
  font-weight: 600;
  color: var(--md-accent-fg-color);
  background: var(--md-accent-fg-color--transparent);
}

.md-nav__item--nested > .md-nav__link {
  font-size: 0.8rem;
}

/* TOC (우측 목차) */
.md-sidebar--secondary .md-nav__link {
  font-size: 0.7rem;
}

/* ===================================
   콘텐츠 영역 (Glassmorphism Card)
   =================================== */
.md-content {
  background: var(--glass-bg-solid);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-radius: 12px;
  margin: 0.5rem;
  padding: 1.5rem;
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}

.md-content__inner {
  max-width: 900px;
  margin: 0 auto;
}

/* ===================================
   타이포그래피 최적화
   =================================== */
.md-typeset {
  font-size: 0.9rem;
  line-height: 1.7;
  letter-spacing: -0.01em;
  word-spacing: -0.02em;
}

.md-typeset p {
  margin-bottom: 1em;
}

.md-typeset li {
  margin-bottom: 0.3em;
}

/* 제목 스타일 (Syne — APEX 디스플레이 폰트) */
.md-typeset h1 {
  font-family: "Syne", var(--md-text-font);
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--md-primary-fg-color);
  border-bottom: 2px solid var(--md-accent-fg-color);
  padding-bottom: 0.5rem;
  margin-bottom: 1.2rem;
}

.md-typeset h2 {
  font-family: "Syne", var(--md-text-font);
  font-size: 1.4rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--md-primary-fg-color);
  margin-top: 1.8rem;
  margin-bottom: 0.8rem;
}

.md-typeset h3 {
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--md-default-fg-color);
  margin-top: 1.5rem;
  margin-bottom: 0.6rem;
}

/* ===================================
   Admonition (알림 박스) - Glassmorphism
   =================================== */
.md-typeset .admonition,
.md-typeset details {
  border-radius: 12px;
  border: none;
  border-left: 4px solid;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
  overflow: hidden;
}

.md-typeset .admonition-title,
.md-typeset summary {
  border-radius: 8px 8px 0 0;
  font-weight: 600;
}

/* 학습 목표 (abstract) — APEX Navy */
.md-typeset .admonition.abstract,
.md-typeset details.abstract {
  border-left-color: #1B2A4A;
}
.md-typeset .abstract > .admonition-title,
.md-typeset .abstract > summary {
  background: linear-gradient(135deg, rgba(27, 42, 74, 0.15) 0%, rgba(27, 42, 74, 0.05) 100%);
}

/* 사례 (example) */
.md-typeset .admonition.example,
.md-typeset details.example {
  border-left-color: #8B5CF6;
}
.md-typeset .example > .admonition-title,
.md-typeset .example > summary {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.15) 0%, rgba(139, 92, 246, 0.05) 100%);
}

/* 주의사항 (warning) */
.md-typeset .admonition.warning,
.md-typeset details.warning {
  border-left-color: #F59E0B;
}
.md-typeset .warning > .admonition-title,
.md-typeset .warning > summary {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.15) 0%, rgba(245, 158, 11, 0.05) 100%);
}

/* 위험 (danger) */
.md-typeset .admonition.danger,
.md-typeset details.danger {
  border-left-color: #EF4444;
}
.md-typeset .danger > .admonition-title,
.md-typeset .danger > summary {
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.15) 0%, rgba(239, 68, 68, 0.05) 100%);
}

/* 팁 (tip) */
.md-typeset .admonition.tip,
.md-typeset details.tip {
  border-left-color: #10B981;
}
.md-typeset .tip > .admonition-title,
.md-typeset .tip > summary {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.15) 0%, rgba(16, 185, 129, 0.05) 100%);
}

/* 정보 (info) */
.md-typeset .admonition.info,
.md-typeset details.info {
  border-left-color: #06B6D4;
}
.md-typeset .info > .admonition-title,
.md-typeset .info > summary {
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.15) 0%, rgba(6, 182, 212, 0.05) 100%);
}

/* 질문 (question) */
.md-typeset .admonition.question,
.md-typeset details.question {
  border-left-color: #EC4899;
}
.md-typeset .question > .admonition-title,
.md-typeset .question > summary {
  background: linear-gradient(135deg, rgba(236, 72, 153, 0.15) 0%, rgba(236, 72, 153, 0.05) 100%);
}

/* 인용 (quote) */
.md-typeset .admonition.quote,
.md-typeset details.quote {
  border-left-color: #6B7280;
}
.md-typeset .quote > .admonition-title,
.md-typeset .quote > summary {
  background: linear-gradient(135deg, rgba(107, 114, 128, 0.15) 0%, rgba(107, 114, 128, 0.05) 100%);
}

/* ===================================
   코드 블록
   =================================== */
.md-typeset pre {
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.md-typeset code {
  font-size: 0.85em;
  padding: 0.2em 0.4em;
  border-radius: 4px;
}

/* ===================================
   테이블
   =================================== */
.md-typeset table:not([class]) {
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.05);
}

.md-typeset table:not([class]) th {
  background-color: var(--md-primary-fg-color);
  color: white;
  font-weight: 600;
}

.md-typeset table:not([class]) tr:nth-child(even) {
  background-color: var(--md-default-bg-color);
}

/* ===================================
   태그
   =================================== */
.md-tag {
  background-color: var(--md-accent-fg-color--transparent);
  color: var(--md-accent-fg-color);
  border-radius: 16px;
  padding: 0.2rem 0.8rem;
  font-size: 0.75rem;
  font-weight: 500;
}

.md-tag:hover {
  background-color: var(--md-accent-fg-color);
  color: white;
}

/* ===================================
   검색
   =================================== */
.md-search__input {
  border-radius: 8px;
  background-color: rgba(255, 255, 255, 0.15);
}

.md-search__input::placeholder {
  color: rgba(255, 255, 255, 0.7);
}

/* ===================================
   푸터
   =================================== */
.md-footer {
  margin-top: 2rem;
}

/* ===================================
   반응형 조정
   =================================== */
@media screen and (max-width: 76.25em) {
  .md-content {
    margin: 0.5rem;
    padding: 0.5rem;
  }
}

/* ===================================
   인쇄용 스타일
   =================================== */
@media print {
  .md-header,
  .md-tabs,
  .md-sidebar,
  .md-footer {
    display: none;
  }
  
  .md-content {
    margin: 0;
    padding: 0;
    box-shadow: none;
  }
}

/* ===================================
   체크박스 리스트 (Task List)
   =================================== */
.md-typeset .task-list-item {
  list-style: none;
  position: relative;
  margin-left: -1.2em;
}

.md-typeset .task-list-control {
  position: relative;
  display: inline-block;
  width: 1.25em;
  height: 1.25em;
  margin-right: 0.5em;
  vertical-align: middle;
}

/* 체크박스 기본 스타일 (체크되지 않은 상태) */
.md-typeset .task-list-control .task-list-indicator::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 1.25em;
  height: 1.25em;
  border: 2px solid var(--md-default-fg-color--lighter);
  border-radius: 4px;
  background-color: var(--md-default-bg-color--light);
  transition: all 0.2s ease;
}

/* 체크된 상태 */
.md-typeset .task-list-control [checked] + .task-list-indicator::before {
  background-color: #1B2A4A;
  border-color: #1B2A4A;
}

/* 체크마크 아이콘 */
.md-typeset .task-list-control [checked] + .task-list-indicator::after {
  content: "";
  position: absolute;
  top: 0.2em;
  left: 0.45em;
  width: 0.35em;
  height: 0.65em;
  border: solid white;
  border-width: 0 2.5px 2.5px 0;
  transform: rotate(45deg);
}

/* 다크 모드 체크박스 */
[data-md-color-scheme="slate"] .md-typeset .task-list-control .task-list-indicator::before {
  background-color: var(--md-default-bg-color--lighter);
  border-color: var(--md-default-fg-color--lighter);
}

[data-md-color-scheme="slate"] .md-typeset .task-list-control [checked] + .task-list-indicator::before {
  background-color: #1B2A4A;
  border-color: #1B2A4A;
}

/* 체크리스트 아이템 호버 효과 */
.md-typeset .task-list-item:hover .task-list-indicator::before {
  border-color: #1B2A4A;
}

/* ===================================
   커스텀 클래스
   =================================== */
/* 핵심 개념 하이라이트 */
.key-concept {
  background: linear-gradient(120deg, var(--md-accent-fg-color--transparent) 0%, var(--md-accent-fg-color--transparent) 100%);
  padding: 1rem 1.5rem;
  border-left: 4px solid var(--md-accent-fg-color);
  border-radius: 0 8px 8px 0;
  margin: 1rem 0;
}

/* 사례 박스 */
.case-study {
  background-color: var(--md-default-bg-color);
  border: 1px solid var(--md-default-fg-color--lightest);
  border-radius: 8px;
  padding: 1rem 1.5rem;
  margin: 1rem 0;
}

.case-study::before {
  content: "📌 사례";
  display: block;
  font-weight: 600;
  color: var(--md-primary-fg-color);
  margin-bottom: 0.5rem;
}

/* Before/After 비교 */
.comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 1rem 0;
}

.comparison-before,
.comparison-after {
  padding: 1rem;
  border-radius: 8px;
}

.comparison-before {
  background-color: rgba(255, 112, 67, 0.1);
  border: 1px solid #FF7043;
}

.comparison-after {
  background-color: rgba(38, 166, 154, 0.1);
  border: 1px solid #1976D2;
}

@media screen and (max-width: 600px) {
  .comparison {
    grid-template-columns: 1fr;
  }
}

/* ===================================
   이전/다음 네비게이션 버튼 (Glassmorphism)
   =================================== */
.nav-buttons {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--glass-border);
}

.nav-buttons .nav-button {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 1.5rem;
  border-radius: 12px;
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  transition: var(--transition-bounce);
  max-width: 45%;
  line-height: 1.4;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.nav-buttons .nav-prev {
  border: 1px solid var(--glass-border);
  color: var(--md-primary-fg-color);
  background: var(--glass-bg);
  text-align: left;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
}

.nav-buttons .nav-prev:hover {
  background: var(--md-accent-fg-color--transparent);
  transform: translateX(-6px) scale(1.02);
  box-shadow: 0 8px 24px rgba(27, 42, 74, 0.15);
  border-color: var(--md-primary-fg-color);
}

.nav-buttons .nav-next {
  background: linear-gradient(135deg, var(--md-primary-fg-color) 0%, var(--md-primary-fg-color--dark) 100%);
  color: white;
  border: none;
  text-align: right;
  margin-left: auto;
  box-shadow: 0 4px 16px rgba(27, 42, 74, 0.3);
}

.nav-buttons .nav-next:hover {
  transform: translateX(6px) scale(1.02);
  box-shadow: 0 8px 24px rgba(27, 42, 74, 0.4);
}

@media screen and (max-width: 600px) {
  .nav-buttons {
    flex-direction: column;
    gap: 1rem;
  }

  .nav-buttons .nav-button {
    width: 100%;
    max-width: 100%;
    justify-content: center;
  }

  .nav-buttons .nav-prev:hover,
  .nav-buttons .nav-next:hover {
    transform: scale(1.02);
  }
}

/* ===================================
   Reading Progress Bar
   =================================== */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--md-primary-fg-color), var(--md-accent-fg-color));
  z-index: 9999;
  transition: width 0.1s ease;
}