/* =========================================
   chipbook common.css
   공통 스타일 시스템
   ========================================= */

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

/* ─── CSS 변수 ─── */
:root {
  --color-primary: #1B5E3A;
  --color-primary-light: #2E7D52;
  --color-primary-bg: #F0F5F2;
  --color-bg: #FFFFFF;
  --color-bg-sub: #F7F7F7;
  --color-text: #1A1A1A;
  --color-text-sub: #777777;
  --color-text-light: #AAAAAA;
  --color-border: #E5E5E5;
  --color-star: #F5A623;
  --color-free: #1B5E3A;

  --font-main: 'Noto Sans KR', sans-serif;
  --inner-width: 1200px;
  --header-height: 72px;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --shadow-sm: 0 1px 4px rgba(0,0,0,.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,.10);
  --transition: .2s ease;
}

/* ─── 리셋 ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-main);
  color: var(--color-text);
  background: var(--color-bg);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, textarea { font-family: inherit; }

/* ─── 레이아웃 ─── */
.inner {
  max-width: var(--inner-width);
  margin: 0 auto;
  padding: 0 40px;
}

/* ─── 헤더 ─── */
#header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-height);
}

.header__inner {
  max-width: var(--inner-width);
  margin: 0 auto;
  padding: 0 40px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 40px;
}

.header__left {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-shrink: 0;
}

.header__logo {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.5px;
}

.header__slogan {
  font-size: 12px;
  color: var(--color-text-sub);
  white-space: nowrap;
}

.header__nav {
  display: flex;
  align-items: center;
  gap: 32px;
  flex: 1;
  justify-content: center;
}

.header__nav-item {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  transition: color var(--transition);
  white-space: nowrap;
}

.header__nav-item:hover,
.header__nav-item.active {
  color: var(--color-primary);
}

.header__right {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-shrink: 0;
}

.header__icon {
  display: flex;
  align-items: center;
  color: var(--color-text);
  transition: color var(--transition);
}
.header__icon:hover { color: var(--color-primary); }

/* ─── 푸터 ─── */
#footer {
  background: var(--color-bg-sub);
  border-top: 1px solid var(--color-border);
  padding: 40px 0;
}

.footer__inner {
  max-width: var(--inner-width);
  margin: 0 auto;
  padding: 0 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  text-align: center;
}

.footer__logo {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
}

.footer__links {
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer__links a {
  font-size: 13px;
  color: var(--color-text-sub);
  transition: color var(--transition);
}
.footer__links a:hover { color: var(--color-primary); }

.footer__divider { color: var(--color-border); font-size: 13px; }

.footer__email {
  font-size: 13px;
  color: var(--color-text-sub);
}

/* ─── 버튼 ─── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 48px;
  padding: 0 24px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-primary);
  color: #fff;
}
.btn--primary:hover { background: var(--color-primary-light); }

.btn--outline {
  background: transparent;
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
}
.btn--outline:hover { background: var(--color-primary-bg); }

.btn--outline-gray {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text-sub);
}
.btn--outline-gray:hover { border-color: var(--color-primary); color: var(--color-primary); }

.btn--sm {
  height: 36px;
  padding: 0 16px;
  font-size: 13px;
}

.btn--lg {
  height: 56px;
  padding: 0 32px;
  font-size: 17px;
}

.btn--full { width: 100%; }
.btn:disabled { opacity: .4; cursor: not-allowed; }

/* ─── 인풋 ─── */
.input {
  width: 100%;
  height: 52px;
  padding: 0 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 15px;
  font-family: inherit;
  color: var(--color-text);
  background: #fff;
  transition: border-color var(--transition);
  outline: none;
}
.input::placeholder { color: var(--color-text-light); }
.input:focus { border-color: var(--color-primary); }

/* ─── 뱃지 ─── */
.badge {
  display: inline-block;
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
  line-height: 1.4;
}
.badge--free {
  background: var(--color-primary);
  color: #fff;
}
.badge--match {
  background: var(--color-primary);
  color: #fff;
}

/* ─── 도서 카드 ─── */
.book-card {
  width: 180px;
  flex-shrink: 0;
}
.book-card__cover-link { display: block; }
.book-card__cover {
  position: relative;
  width: 180px;
  height: 240px;
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 16px;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}
.book-card__cover:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.book-card__cover .badge {
  position: absolute;
  top: 10px;
  left: 10px;
}
.book-card__cover-title {
  font-size: 15px;
  font-weight: 700;
  line-height: 1.4;
  margin-top: auto;
}

.book-card__info {
  margin-top: 10px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.book-card__title {
  font-size: 14px;
  font-weight: 600;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.book-card__subtitle {
  font-size: 12px;
  color: var(--color-text-sub);
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.book-card__author { font-size: 12px; color: var(--color-text-sub); }
.book-card__stats {
  display: flex;
  gap: 12px;
  font-size: 12px;
  color: var(--color-text-light);
  margin-top: 4px;
}
.book-card__rating {
  font-size: 12px;
  color: var(--color-text-sub);
  margin-top: 2px;
}
.book-card__rating .stars { color: var(--color-star); }
.book-card__price {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-text);
  margin-top: 2px;
}

/* ─── 섹션 헤더 ─── */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 28px;
}
.section-header__left {
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.section-header__title {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text);
}
.section-header__sub {
  font-size: 14px;
  color: var(--color-text-sub);
}
.section-header__more {
  font-size: 13px;
  color: var(--color-text-sub);
  display: flex;
  align-items: center;
  gap: 4px;
  transition: color var(--transition);
}
.section-header__more:hover { color: var(--color-primary); }

/* ─── 별점 ─── */
.stars { color: var(--color-star); }

/* ─── 체크박스 ─── */
.checkbox-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 0;
  border-bottom: 1px solid var(--color-border);
  cursor: pointer;
}
.checkbox-item:last-child { border-bottom: none; }
.checkbox-item input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--color-primary);
  cursor: pointer;
}
.checkbox-item__label { font-size: 14px; flex: 1; }
.checkbox-item__link {
  font-size: 13px;
  color: var(--color-text-sub);
  display: flex;
  align-items: center;
  gap: 2px;
}

/* ─── 태그 ─── */
.tag {
  display: inline-block;
  padding: 5px 12px;
  border: 1px solid var(--color-border);
  border-radius: 20px;
  font-size: 13px;
  color: var(--color-text);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}
.tag:hover, .tag.active {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-bg);
}

/* ─── 카드 공통 ─── */
.card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

/* ─── 브레드크럼 ─── */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--color-text-sub);
  margin-bottom: 24px;
}
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb__sep { color: var(--color-border); }

/* ─── 탭 ─── */
.tabs {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--color-border);
  margin-bottom: 24px;
}
.tab-btn {
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-sub);
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: all var(--transition);
}
.tab-btn.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
  font-weight: 600;
}
.tab-btn:hover { color: var(--color-primary); }

/* ─── 빈 상태 ─── */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--color-text-sub);
}
.empty-state__icon { font-size: 48px; margin-bottom: 16px; }
.empty-state__title { font-size: 18px; font-weight: 600; margin-bottom: 8px; color: var(--color-text); }
.empty-state__desc { font-size: 14px; }

/* ─── 페이지 래퍼 ─── */
.page-wrapper {
  min-height: calc(100vh - var(--header-height) - 120px);
}

/* ─── 유틸리티 ─── */
.text-primary { color: var(--color-primary); }
.text-sub { color: var(--color-text-sub); }
.text-light { color: var(--color-text-light); }
.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.gap-8 { gap: 8px; }
.gap-16 { gap: 16px; }
.gap-24 { gap: 24px; }