/* =============================================
   북클래스 — 메인 스타일
   주 색상: #005f3d
   ============================================= */

:root {
  --green:      #005f3d;
  --green-dark: #004d31;
  --green-deep: #003b25;
  --green-lt:   #eaf4ef;
  --green-md:   #c2dfd1;
  --green-mid:  #2d8a62;
  --blue-lt:    #eaf0f8;
  --blue-mid:   #185fa5;
  --amber:      #BA7517;
  --text:       #111;
  --text-sub:   #555;
  --text-mute:  #888;
  --border:     #e4e4e0;
  --bg-alt:     #f7f8f6;
  --radius-sm:  8px;
  --radius-md:  12px;
  --radius-lg:  16px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, 'Apple SD Gothic Neo', 'Noto Sans KR', sans-serif;
  color: var(--text);
  background: #fff;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── NAV ── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}
.nav-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--green);
  flex-shrink: 0;
}
.nav-links {
  display: flex;
  gap: 28px;
}
.nav-links a {
  font-size: 14px;
  color: var(--text-sub);
  text-decoration: none;
  transition: color 0.15s;
}
.nav-links a:hover { color: var(--green); }
.nav-cta {
  background: var(--green);
  color: #fff;
  border: none;
  border-radius: 20px;
  padding: 8px 18px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
  white-space: nowrap;
}
.nav-cta:hover { background: var(--green-dark); }

/* ── BUTTONS ── */
.btn-main {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: var(--green);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 13px 22px;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  text-decoration: none;
}
.btn-main:hover { background: var(--green-dark); }
.btn-main:active { transform: scale(0.98); }

.btn-sub {
  display: inline-flex;
  align-items: center;
  background: transparent;
  color: var(--text-sub);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 13px 20px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: border-color 0.2s, color 0.2s;
}
.btn-sub:hover { border-color: var(--green); color: var(--green); }

/* ── HERO ── */
.hero {
  border-bottom: 1px solid var(--border);
}
.hero-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  min-height: 560px;
}
.hero-left {
  padding: 56px 40px 56px 0;
  display: flex;
  flex-direction: column;
  gap: 22px;
  justify-content: center;
  border-right: 1px solid var(--border);
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: var(--green-lt);
  color: var(--green-dark);
  font-size: 12px;
  font-weight: 600;
  border-radius: 20px;
  padding: 6px 14px;
  width: fit-content;
}
.badge-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--green);
  flex-shrink: 0;
}
.hero-title {
  font-size: 34px;
  font-weight: 800;
  line-height: 1.3;
  color: var(--text);
}
.hero-title em {
  font-style: normal;
  color: var(--green);
}
.hero-sub {
  font-size: 15px;
  color: var(--text-sub);
  line-height: 1.75;
}
.check-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.check-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-sub);
}
.check-icon {
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--green-lt);
  color: var(--green);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  flex-shrink: 0;
}
.hero-btns {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.social-row {
  display: flex;
  align-items: center;
  gap: 10px;
}
.avatars { display: flex; }
.av {
  width: 28px; height: 28px;
  border-radius: 50%;
  border: 2px solid #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  margin-left: -7px;
}
.av:first-child { margin-left: 0; }
.av1 { background: var(--green-md); color: var(--green-deep); }
.av2 { background: #b5d4f4; color: #0c447c; }
.av3 { background: var(--green-lt); color: var(--green-dark); }
.av4 { background: #faeeda; color: #633806; }
.social-text { font-size: 12px; color: var(--text-mute); }

.hero-right {
  padding: 32px 0 32px 40px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  justify-content: center;
}
.stat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.stat-card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
}
.stat-num {
  font-size: 20px;
  font-weight: 800;
  color: var(--text);
}
.stat-num span { font-size: 13px; font-weight: 500; color: var(--text-mute); }
.stat-lbl { font-size: 12px; color: var(--text-mute); margin-top: 3px; }

.review-mini {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.review-tag {
  background: var(--green-lt);
  color: var(--green-dark);
  font-size: 11px;
  font-weight: 600;
  border-radius: 6px;
  padding: 3px 9px;
  width: fit-content;
}
.review-head {
  display: flex;
  align-items: center;
  gap: 10px;
}
.rv-av {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--green-lt);
  color: var(--green-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
}
.rv-name { font-size: 13px; font-weight: 600; color: var(--text); }
.rv-grade { font-size: 11px; color: var(--text-mute); }
.rv-stars { color: var(--amber); font-size: 12px; margin-left: auto; }
.rv-text { font-size: 13px; color: var(--text-sub); line-height: 1.65; }

.prog-chips {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.prog-chip {
  border-radius: var(--radius-sm);
  padding: 14px;
}
.chip-read { background: var(--green-lt); border: 1px solid var(--green-md); }
.chip-write { background: var(--blue-lt); border: 1px solid #b5cee8; }
.chip-icon { font-size: 18px; margin-bottom: 4px; }
.chip-title { font-size: 13px; font-weight: 700; }
.chip-read .chip-title { color: var(--green-deep); }
.chip-write .chip-title { color: var(--blue-mid); }
.chip-sub { font-size: 11px; margin-top: 2px; }
.chip-read .chip-sub { color: var(--green-dark); }
.chip-write .chip-sub { color: var(--blue-mid); }

/* ── SECTIONS ── */
.sec { padding: 80px 0; }
.sec-alt { background: var(--bg-alt); }
.sec-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}
.sec-lbl {
  font-size: 12px;
  font-weight: 700;
  color: var(--green);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.sec-title {
  font-size: 28px;
  font-weight: 800;
  color: var(--text);
  line-height: 1.35;
  margin-bottom: 10px;
}
.sec-sub {
  font-size: 15px;
  color: var(--text-sub);
  line-height: 1.7;
  margin-bottom: 36px;
}

/* ── PAIN ── */
.pain-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.pain-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.pain-ico { font-size: 26px; }
.pain-q { font-size: 14px; font-weight: 700; color: var(--text); line-height: 1.5; }
.pain-a { font-size: 13px; color: var(--text-sub); line-height: 1.65; }
.pain-resolve {
  margin-top: 28px;
  background: var(--green-lt);
  border: 1px solid var(--green-md);
  border-radius: var(--radius-md);
  padding: 18px 22px;
  display: flex;
  align-items: flex-start;
  gap: 14px;
}
.resolve-icon {
  width: 24px; height: 24px;
  border-radius: 50%;
  background: var(--green);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 1px;
}
.pain-resolve p { font-size: 14px; color: var(--green-deep); line-height: 1.65; }
.pain-resolve strong { font-weight: 700; }

/* ── DIFF ── */
.diff-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}
.diff-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.diff-num { font-size: 12px; font-weight: 700; color: var(--green-mid); }
.diff-title { font-size: 15px; font-weight: 700; color: var(--text); }
.diff-desc { font-size: 13px; color: var(--text-sub); line-height: 1.65; }
.diff-tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: var(--green-lt);
  color: var(--green-dark);
  font-size: 12px;
  font-weight: 600;
  border-radius: 20px;
  padding: 4px 12px;
  width: fit-content;
  margin-top: 4px;
}

/* ── PROGRAM ── */
.prog-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.prog-main {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.prog-header {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}
.prog-icon-box {
  width: 44px; height: 44px;
  border-radius: var(--radius-sm);
  background: var(--green-lt);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}
.prog-name { font-size: 15px; font-weight: 700; color: var(--text); }
.prog-desc { font-size: 13px; color: var(--text-sub); line-height: 1.6; margin-top: 3px; }
.prog-steps { display: flex; flex-direction: column; gap: 12px; }
.prog-step { display: flex; align-items: flex-start; gap: 12px; }
.step-dot {
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--green-md);
  color: var(--green-deep);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 1px;
}
.step-text { font-size: 13px; color: var(--text-sub); line-height: 1.6; }
.step-text strong { font-weight: 700; color: var(--text); }

.prog-side { display: flex; flex-direction: column; gap: 12px; }
.prog-side-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px;
}
.side-label { font-size: 12px; color: var(--text-mute); margin-bottom: 12px; }
.grade-bars { display: flex; flex-direction: column; gap: 8px; }
.grade-row { display: flex; align-items: center; gap: 10px; }
.grade-lbl { font-size: 12px; color: var(--text-mute); width: 36px; flex-shrink: 0; }
.grade-bg { flex: 1; height: 7px; background: var(--bg-alt); border-radius: 4px; overflow: hidden; }
.grade-fill { height: 100%; border-radius: 4px; background: var(--green); transition: width 1s ease; }
.genre-pills { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 4px; }
.gp {
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 20px;
  background: var(--green-lt);
  color: var(--green-dark);
  font-weight: 500;
}
.gp-b { background: var(--blue-lt); color: var(--blue-mid); }

/* ── INSTRUCTOR ── */
.instr-body {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 40px;
  align-items: start;
}
.instr-photo {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  aspect-ratio: 3/4;
  display: flex;
  align-items: center;
  justify-content: center;
}
.instr-photo-placeholder { font-size: 13px; color: var(--text-mute); }
.instr-info { display: flex; flex-direction: column; gap: 16px; }
.instr-name { font-size: 22px; font-weight: 800; color: var(--text); }
.instr-role { font-size: 14px; color: var(--green); margin-top: 3px; font-weight: 600; }
.instr-bio { font-size: 14px; color: var(--text-sub); line-height: 1.75; }
.instr-badges { display: flex; flex-wrap: wrap; gap: 8px; }
.instr-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  font-size: 13px;
  color: var(--text-sub);
}
.instr-quote {
  border-left: 3px solid var(--green);
  padding-left: 18px;
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.75;
  font-style: italic;
  border-radius: 0;
}

/* ── REVIEWS ── */
.review-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.review-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.rv-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.rva {
  width: 38px; height: 38px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
}
.rva1 { background: var(--green-lt); color: var(--green-dark); }
.rva2 { background: var(--blue-lt); color: var(--blue-mid); }
.rva3 { background: #faeeda; color: #633806; }
.rv-stars-lg { color: var(--amber); font-size: 14px; letter-spacing: 1px; }
.rv-card-name { font-size: 13px; font-weight: 700; color: var(--text); }
.rv-card-grade { font-size: 12px; color: var(--text-mute); }
.rv-card-text { font-size: 13px; color: var(--text-sub); line-height: 1.7; flex: 1; }
.rv-tags { display: flex; flex-wrap: wrap; gap: 5px; }
.rv-tag {
  font-size: 11px;
  background: var(--bg-alt);
  color: var(--text-mute);
  border-radius: 20px;
  padding: 3px 10px;
}

/* ── FAQ ── */
.faq-list { display: flex; flex-direction: column; gap: 8px; }
.faq-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.faq-q {
  width: 100%;
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  text-align: left;
  gap: 12px;
}
.faq-q:hover { color: var(--green); }
.faq-arrow {
  font-size: 16px;
  color: var(--text-mute);
  flex-shrink: 0;
  transition: transform 0.25s ease;
  display: inline-block;
}
.faq-q[aria-expanded="true"] .faq-arrow { transform: rotate(180deg); }
.faq-a {
  display: none;
  padding: 0 22px 18px;
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.75;
  border-top: 1px solid var(--border);
  padding-top: 16px;
}
.faq-a.open { display: block; }

/* ── CTA ── */
.cta-box {
  background: var(--green);
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  text-align: center;
}
.cta-tag {
  background: var(--green-mid);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  border-radius: 20px;
  padding: 5px 16px;
}
.cta-title {
  font-size: 28px;
  font-weight: 800;
  color: #fff;
  line-height: 1.35;
}
.cta-sub {
  font-size: 15px;
  color: var(--green-md);
  line-height: 1.7;
}
.cta-btn {
  background: #fff !important;
  color: var(--green-dark) !important;
  font-size: 15px;
  padding: 14px 28px;
}
.cta-btn:hover { background: var(--green-lt) !important; }
.cta-note { font-size: 12px; color: var(--green-md); }

/* ── FOOTER ── */
.footer {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  padding: 40px 0 32px;
}
.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
}
.footer-links {
  display: flex;
  gap: 24px;
}
.footer-links a {
  font-size: 13px;
  color: var(--text-mute);
  text-decoration: none;
  transition: color 0.15s;
}
.footer-links a:hover { color: var(--green); }
.footer-contact {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}
.footer-contact a {
  font-size: 13px;
  color: var(--text-sub);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 5px;
  transition: color 0.15s;
}
.footer-contact a:hover { color: var(--green); }
.footer-meta {
  font-size: 12px;
  color: var(--text-mute);
  line-height: 1.8;
  border-top: 1px solid var(--border);
  padding-top: 16px;
}

/* ── 스크롤 등장 애니메이션 ── */
.fade-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── 반응형 ── */
@media (max-width: 768px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-left {
    padding: 40px 0 28px;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
  .hero-right { padding: 28px 0 40px; }
  .hero-title { font-size: 26px; }
  .pain-grid,
  .review-grid { grid-template-columns: 1fr; }
  .diff-grid,
  .prog-body { grid-template-columns: 1fr; }
  .instr-body { grid-template-columns: 1fr; }
  .instr-photo { aspect-ratio: 4/3; }
  .nav-links { display: none; }
  .footer-top { flex-direction: column; align-items: flex-start; gap: 12px; }
  .sec-title { font-size: 22px; }
}


/* =============================================
   추가 효과 — reveal / ripple / float / toast / faq-body
   ============================================= */

/* ── 헤더 스크롤 그림자 ── */
.nav.scrolled {
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
}

/* ── 스크롤 진입 애니메이션 ── */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── FAQ max-height 슬라이딩 ── */
.faq-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}
.faq-body-inner {
  padding: 0 22px 18px;
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.75;
  border-top: 1px solid var(--border);
  padding-top: 16px;
}
/* 기존 .faq-a 제거 (faq-body로 대체) */
.faq-a { display: none; }

.faq-q[aria-expanded="true"] .faq-arrow {
  transform: rotate(180deg);
}
.faq-arrow {
  transition: transform 0.3s ease;
  display: inline-block;
}

/* ── Ripple 효과 ── */
.ripple-wrap {
  position: relative;
  overflow: hidden;
}
.ripple-circle {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.35);
  pointer-events: none;
  animation: ripple-anim 0.55s ease-out forwards;
  transform: scale(0);
}
@keyframes ripple-anim {
  to {
    transform: scale(1);
    opacity: 0;
  }
}

/* ── 플로팅 CTA 버튼 ── */
.float-btn {
  position: fixed;
  bottom: 28px;
  right: 28px;
  z-index: 200;
  background: var(--green);
  color: #fff;
  border: none;
  border-radius: 50px;
  padding: 14px 22px;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(0, 95, 61, 0.35);
  transition: background 0.2s, transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.3s;
  display: flex;
  align-items: center;
  gap: 7px;
}
.float-btn:hover {
  background: var(--green-dark);
  transform: translateY(-3px) scale(1.03);
}
.float-btn.hidden {
  opacity: 0;
  transform: translateY(16px);
  pointer-events: none;
}

/* ── 토스트 알림 ── */
.toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: #222;
  color: #fff;
  font-size: 14px;
  border-radius: 10px;
  padding: 13px 22px;
  z-index: 999;
  transition: transform 0.3s ease, opacity 0.3s ease;
  opacity: 0;
  white-space: nowrap;
  pointer-events: none;
}
.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

@media (max-width: 480px) {
  .float-btn { bottom: 20px; right: 16px; padding: 12px 18px; font-size: 13px; }
  .toast { font-size: 13px; padding: 11px 18px; white-space: normal; max-width: 90vw; text-align: center; }
}