/* ========================================
   반려견 사료 백과사전 — Design System CSS
   "The Editorial Canine" 기반
======================================== */

/* ── 0. Google Fonts ─────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+KR:wght@400;700&family=Noto+Sans+KR:wght@300;400;500;600;700&family=Material+Symbols+Outlined:wght,FILL@100..700,0..1&display=swap');

/* ── 1. 디자인 토큰 ──────────────────── */
:root {
  /* Primary — Deep Teal */
  --primary:            #12423f;
  --primary-container:  #2d5a56;
  --primary-fixed:      #bcece6;
  --on-primary:         #ffffff;

  /* Secondary — Golden Accent */
  --secondary:              #775a19;
  --secondary-container:    #fed488;
  --secondary-fixed:        #ffdea5;
  --on-secondary:           #ffffff;
  --on-secondary-container: #785a1a;
  --on-secondary-fixed-var: #5d4201;

  /* Tertiary — Warm Sand */
  --tertiary-fixed:         #ede1c9;
  --on-tertiary-fixed-var:  #4d4634;

  /* Surface Tiers — Cream Parchment */
  --surface:              #fbf9f5;
  --surface-low:          #f5f3ef;
  --surface-container:    #efeeea;
  --surface-high:         #eae8e4;
  --surface-highest:      #e4e2de;
  --surface-lowest:       #ffffff;

  /* Text */
  --on-surface:         #1b1c1a;
  --on-surface-variant: #404847;

  /* Border */
  --outline:            #707977;
  --outline-variant:    #c0c8c6;

  /* Semantic */
  --error:              #ba1a1a;

  /* Typography */
  --font-headline: 'Noto Serif KR', serif;
  --font-body:     'Noto Sans KR', sans-serif;

  /* Spacing */
  --space-xs:  4px;
  --space-sm:  8px;
  --space-md:  16px;
  --space-lg:  32px;
  --space-xl:  64px;
  --space-2xl: 96px;

  /* Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadow */
  --shadow-sm: 0 2px 8px rgba(27,28,26,0.06);
  --shadow-md: 0 4px 20px rgba(27,28,26,0.08);
  --shadow-lg: 0 8px 40px rgba(27,28,26,0.10);

  --max-width: 1100px;
}

/* ── 2. 리셋 & 베이스 ─────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background-color: var(--surface);
  color: var(--on-surface);
  line-height: 1.7;
  min-height: 100dvh;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--secondary); }

img { max-width: 100%; height: auto; display: block; }

/* ── 3. 레이아웃 ──────────────────────── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* ── 4. 헤더 & 네비 ──────────────────── */
.site-header {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 100;
  background-color: rgba(251,249,245,0.82);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 4px 40px rgba(27,28,26,0.06);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: var(--space-md);
}

.site-logo {
  font-family: var(--font-headline);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--primary);
  white-space: nowrap;
  letter-spacing: -0.01em;
}
.site-logo:hover { color: var(--primary); text-decoration: none; }

.site-nav {
  display: flex;
  gap: 4px;
  align-items: center;
  list-style: none;
}

.site-nav a {
  font-family: var(--font-headline);
  font-size: 0.88rem;
  font-weight: 400;
  color: rgba(27,28,26,0.65);
  padding: 6px 10px;
  border-radius: var(--radius-md);
  transition: color 0.2s, background 0.2s;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--primary);
  background-color: var(--surface-low);
  text-decoration: none;
  font-weight: 600;
}

/* 햄버거 */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  border-radius: var(--radius-full);
  color: var(--primary);
  font-size: 1.4rem;
  transition: background 0.2s;
}
.nav-toggle:hover { background-color: var(--surface-low); }

/* ── 5. 히어로 영역 ───────────────────── */
/* .page-hero (age/index.html 스타일) */
.page-hero {
  padding: calc(68px + 56px) 0 56px;
  background-color: var(--surface-low);
}

.page-hero .container { max-width: var(--max-width); margin: 0 auto; padding: 0 var(--space-md); }

.page-hero .page-label {
  display: inline-block;
  padding: 4px 12px;
  background-color: var(--secondary-fixed);
  color: var(--on-secondary-fixed-var);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
}

.page-hero h1 {
  font-family: var(--font-headline);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  color: var(--primary);
  line-height: 1.25;
  margin-bottom: 12px;
}

.page-hero p {
  font-size: 1.05rem;
  color: var(--on-surface-variant);
  max-width: 560px;
  line-height: 1.7;
}

/* .hero (breed, tools, problem 등) — 동일 처리 */
.hero {
  padding: calc(68px + 48px) 0 48px;
  background-color: var(--surface-low);
}
.hero .container { max-width: var(--max-width); margin: 0 auto; padding: 0 var(--space-md); }
.hero h1 {
  font-family: var(--font-headline);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 10px;
  line-height: 1.25;
}
.hero p {
  font-size: 1.05rem;
  color: var(--on-surface-variant);
  max-width: 560px;
}

/* ── 6. 브레드크럼 ───────────────────── */
.breadcrumb {
  font-size: 0.83rem;
  color: var(--on-surface-variant);
  margin-bottom: var(--space-lg);
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  align-items: center;
}
.breadcrumb ol {
  display: flex;
  gap: 6px;
  list-style: none;
  flex-wrap: wrap;
}
.breadcrumb a { color: var(--on-surface-variant); }
.breadcrumb a:hover { color: var(--primary); text-decoration: none; }
.breadcrumb li + li::before { content: '›'; margin-right: 6px; opacity: 0.5; }
.breadcrumb span::before { content: '›'; margin-right: 6px; opacity: 0.5; }

/* ── 7. 카드 그리드 ──────────────────── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-lg);
  padding: var(--space-lg) 0;
}

.card {
  background-color: var(--surface-lowest);
  border-radius: var(--radius-xl);
  padding: var(--space-lg);
  transition: box-shadow 0.25s, transform 0.25s;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-full);
  background-color: var(--primary-fixed);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 4px;
  flex-shrink: 0;
}

.card h3, .card .card-title {
  font-family: var(--font-headline);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary);
}

.card h2.card-title {
  font-family: var(--font-headline);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--primary);
}

.card p, .card .card-desc {
  font-size: 0.9rem;
  color: var(--on-surface-variant);
  flex: 1;
  line-height: 1.65;
}

.card .btn {
  margin-top: var(--space-sm);
  align-self: flex-start;
}

/* ── 8. 섹션 타이틀 ──────────────────── */
.section-title {
  font-family: var(--font-headline);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--primary);
  margin: var(--space-xl) 0 var(--space-md);
  padding-bottom: var(--space-sm);
}

/* ── 9. 버튼 ──────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 22px;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 700;
  font-family: var(--font-body);
  cursor: pointer;
  border: none;
  transition: opacity 0.2s, transform 0.15s, background 0.2s;
  text-decoration: none;
  line-height: 1.4;
}
.btn:active { transform: scale(0.97); }
.btn:hover { text-decoration: none; }

.btn-primary {
  background-color: var(--primary);
  color: var(--on-primary);
}
.btn-primary:hover { opacity: 0.88; color: var(--on-primary); }

.btn-secondary {
  background-color: var(--secondary-container);
  color: var(--on-secondary-container);
}
.btn-secondary:hover { opacity: 0.88; color: var(--on-secondary-container); }

.btn-outline {
  background-color: transparent;
  border: 1.5px solid rgba(112,121,119,0.3);
  color: var(--primary);
}
.btn-outline:hover {
  background-color: var(--surface-low);
  border-color: var(--outline);
  color: var(--primary);
}

/* ── 10. 본문 콘텐츠 영역 ─────────────── */
.content-area {
  padding: var(--space-lg) 0 var(--space-xl);
}

.content-area h2 {
  font-family: var(--font-headline);
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--primary);
  margin: var(--space-xl) 0 var(--space-md);
  padding-top: var(--space-md);
}
.content-area h2:first-of-type { margin-top: var(--space-lg); }

.content-area h3 {
  font-family: var(--font-headline);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary);
  margin: var(--space-lg) 0 var(--space-sm);
}

.content-area p { margin-bottom: var(--space-md); color: var(--on-surface-variant); line-height: 1.8; }

.content-area ul,
.content-area ol {
  padding-left: var(--space-lg);
  margin-bottom: var(--space-md);
  color: var(--on-surface-variant);
}
.content-area li { margin-bottom: var(--space-xs); line-height: 1.7; }

/* ── 11. 아티클 전용 컴포넌트 ───────────── */

/* 목차 박스 */
.toc-box {
  background-color: var(--surface-low);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  margin: var(--space-lg) 0;
}
.toc-box h3 {
  font-family: var(--font-headline);
  font-size: 0.9rem;
  color: var(--primary);
  font-weight: 700;
  margin-bottom: 12px;
}
.toc-box ol { padding-left: 20px; margin: 0; }
.toc-box li { margin-bottom: 6px; font-size: 0.9rem; }
.toc-box a { color: var(--primary); }
.toc-box a:hover { color: var(--secondary); }

/* 정보 테이블 */
.info-table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0 24px;
  font-size: 0.9rem;
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.info-table th,
.info-table td {
  padding: 12px 16px;
  text-align: left;
}
.info-table th {
  background-color: var(--primary);
  color: var(--on-primary);
  font-weight: 600;
  font-family: var(--font-headline);
}
.info-table tr:nth-child(even) td { background-color: var(--surface-low); }
.info-table tr:nth-child(odd) td { background-color: var(--surface-lowest); }

/* 체크리스트 */
.check-list {
  list-style: none;
  padding: 0;
  margin: 12px 0 var(--space-lg);
}
.check-list li {
  padding: 10px 0 10px 32px;
  position: relative;
  color: var(--on-surface-variant);
  font-size: 0.93rem;
  line-height: 1.65;
}
.check-list li + li {
  border-top: 1px solid rgba(192,200,198,0.25);
}
.check-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 14px;
  width: 18px;
  height: 18px;
  border-radius: var(--radius-full);
  background-color: var(--primary-fixed);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='%2312423f'%3E%3Cpath fill-rule='evenodd' d='M16.707 5.293a1 1 0 010 1.414l-8 8a1 1 0 01-1.414 0l-4-4a1 1 0 011.414-1.414L8 12.586l7.293-7.293a1 1 0 011.414 0z' clip-rule='evenodd'/%3E%3C/svg%3E");
  background-size: 12px;
  background-repeat: no-repeat;
  background-position: center;
}

/* 경고 박스 */
.warning-box {
  background-color: #fff5f5;
  border-left: 3px solid var(--error);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  font-size: 0.9rem;
  color: #7a1515;
  margin: var(--space-md) 0;
  line-height: 1.65;
}

/* 팁 박스 */
.tip-box {
  background-color: var(--surface-low);
  border-left: 3px solid var(--primary-container);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  font-size: 0.9rem;
  color: var(--on-surface-variant);
  margin: var(--space-md) 0;
  line-height: 1.65;
}

/* 관련 글 박스 */
.related-box {
  background-color: var(--surface-low);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  margin: var(--space-xl) 0;
}
.related-box h3 {
  font-family: var(--font-headline);
  font-size: 0.9rem;
  color: var(--primary);
  font-weight: 700;
  margin-bottom: 14px;
}
.related-box ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.related-box ul li a {
  display: inline-block;
  padding: 6px 16px;
  background-color: var(--surface-lowest);
  border: 1.5px solid rgba(192,200,198,0.4);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  color: var(--primary);
  transition: background 0.2s, border-color 0.2s;
}
.related-box ul li a:hover {
  background-color: var(--primary-fixed);
  border-color: var(--primary);
  text-decoration: none;
}

/* 면책 박스 */
.disclaimer-box {
  background-color: var(--surface-container);
  border-radius: var(--radius-lg);
  padding: 14px 18px;
  font-size: 0.87rem;
  color: var(--on-surface-variant);
  margin: var(--space-lg) 0;
  display: flex;
  gap: 10px;
  align-items: flex-start;
  line-height: 1.65;
}

/* ── 12. 푸터 ──────────────────────────── */
.site-footer {
  background-color: var(--surface-low);
  color: var(--on-surface-variant);
  padding: var(--space-xl) 0 var(--space-lg);
  margin-top: var(--space-xl);
  font-size: 0.875rem;
  border-top: 1px solid rgba(192,200,198,0.3);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-xl);
  margin-bottom: var(--space-lg);
}

.footer-brand strong { color: var(--primary); font-family: var(--font-headline); }
.footer-brand p {
  margin-top: var(--space-sm);
  line-height: 1.65;
  font-size: 0.85rem;
  color: var(--on-surface-variant);
}

.site-footer h4 {
  font-family: var(--font-headline);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: var(--space-md);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.footer-links a {
  color: var(--on-surface-variant);
  font-size: 0.88rem;
  transition: color 0.2s;
}
.footer-links a:hover { color: var(--secondary); text-decoration: none; }

.footer-bottom {
  border-top: 1px solid rgba(192,200,198,0.3);
  padding-top: var(--space-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-sm);
  font-size: 0.78rem;
  color: rgba(64,72,71,0.55);
}
.footer-bottom a { color: rgba(64,72,71,0.55); }
.footer-bottom a:hover { color: var(--primary); }

/* ── 13. 반응형 ──────────────────────── */
@media (max-width: 768px) {
  .site-nav {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background-color: rgba(251,249,245,0.97);
    flex-direction: column;
    padding: var(--space-md);
    gap: 2px;
    border-bottom: 1px solid rgba(192,200,198,0.3);
    box-shadow: var(--shadow-md);
  }
  .site-nav.open { display: flex; }
  .nav-toggle { display: block; }

  .page-hero h1, .hero h1 { font-size: 1.7rem; }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
  .footer-bottom { flex-direction: column; text-align: center; }

  .card-grid { grid-template-columns: 1fr; }
}