/* =========================================================
   1. 디자인 토큰 (색상/여백/폰트 등 공통 값)
   - 여기 숫자/색상만 바꾸면 사이트 전체 톤이 바뀝니다.
========================================================= */
:root {
  --color-primary: #2952e3;      /* 메인 브랜드 컬러 (파랑) */
  --color-primary-dark: #1c3aa8;
  --color-primary-light: #eef1fd;
  --color-accent: #ff7a45;       /* 강조/CTA 컬러 (주황) */
  --color-accent-dark: #e85d2a;
  --color-text: #1a1d29;
  --color-text-sub: #5b5f6b;
  --color-text-light: #8b8f9a;
  --color-bg: #ffffff;
  --color-bg-soft: #f6f7fb;
  --color-border: #e7e9f0;

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;

  --shadow-sm: 0 2px 8px rgba(26, 29, 41, 0.06);
  --shadow-md: 0 8px 24px rgba(26, 29, 41, 0.08);
  --shadow-lg: 0 16px 40px rgba(26, 29, 41, 0.12);

  --container-width: 1120px;

  --font-base: -apple-system, BlinkMacSystemFont, "Malgun Gothic", "Apple SD Gothic Neo",
    "Segoe UI", Roboto, sans-serif;
}

/* =========================================================
   2. 리셋 & 기본 스타일
========================================================= */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 90px; /* 고정 헤더 높이만큼 앵커 이동 보정 */
}

body {
  font-family: var(--font-base);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  word-break: keep-all; /* 한글 단어 단위 줄바꿈 */
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 96px 0;
}

@media (max-width: 768px) {
  section {
    padding: 64px 0;
  }
}

.section-soft {
  background: var(--color-bg-soft);
}

.section-dark {
  background: var(--color-text);
  color: #fff;
}

/* 섹션 상단 라벨 (예: "CURRICULUM") */
.eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 16px;
}

.section-dark .eyebrow {
  color: #ffd8c2;
  background: rgba(255, 122, 69, 0.15);
}

.section-title {
  font-size: clamp(24px, 4vw, 36px);
  font-weight: 800;
  line-height: 1.4;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 17px;
  color: var(--color-text-sub);
  max-width: 640px;
}

.section-dark .section-desc {
  color: rgba(255, 255, 255, 0.75);
}

.section-head {
  text-align: center;
  margin-bottom: 56px;
}

.section-head .section-desc {
  margin: 0 auto;
}

/* =========================================================
   3. 버튼 & CTA
========================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 15px 28px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 16px;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
  white-space: nowrap;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  background: var(--color-accent-dark);
}

.btn-outline {
  background: #fff;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-block {
  width: 100%;
}

.btn-lg {
  padding: 18px 32px;
  font-size: 18px;
}

/* =========================================================
   4. 헤더 / 네비게이션
========================================================= */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 76px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
}

.site-header .container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 20px;
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

.logo span {
  color: var(--color-text);
}

.nav-menu {
  display: flex;
  gap: 8px;
  align-items: center;
}

.nav-menu a {
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 15px;
  color: var(--color-text-sub);
  transition: background 0.15s ease, color 0.15s ease;
}

.nav-menu a:hover,
.nav-menu a.active {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-call-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--color-primary);
  color: #fff;
  padding: 11px 20px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 15px;
}

.header-call-btn:hover {
  background: var(--color-primary-dark);
}

.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
}

.menu-toggle svg {
  width: 24px;
  height: 24px;
}

@media (max-width: 900px) {
  .nav-menu {
    position: fixed;
    top: 76px;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    align-items: stretch;
    padding: 12px 24px 24px;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: all 0.2s ease;
  }

  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-menu a {
    padding: 14px 12px;
    border-bottom: 1px solid var(--color-border);
  }

  .menu-toggle {
    display: flex;
  }

  .header-call-btn span.label-full {
    display: none;
  }
}

/* body에 헤더 높이만큼 여백 */
main {
  padding-top: 76px;
}

/* =========================================================
   5. 히어로 섹션
========================================================= */
.hero {
  background: linear-gradient(160deg, var(--color-primary-light) 0%, #ffffff 55%);
  padding: 88px 0 80px;
  text-align: center;
}

.hero-eyebrow {
  color: var(--color-primary);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.08em;
  margin-bottom: 18px;
}

.hero-title {
  font-size: clamp(32px, 5.5vw, 52px);
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

.hero-title em {
  font-style: normal;
  color: var(--color-primary);
  position: relative;
}

.hero-desc {
  font-size: 18px;
  color: var(--color-text-sub);
  max-width: 560px;
  margin: 0 auto 36px;
}

.hero-cta {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
}

.hero-stat b {
  display: block;
  font-size: 30px;
  font-weight: 800;
  color: var(--color-primary);
}

.hero-stat span {
  font-size: 14px;
  color: var(--color-text-light);
}

/* =========================================================
   6. 페인포인트 태그 (마퀴 스타일)
========================================================= */
.tag-marquee {
  overflow: hidden;
  position: relative;
  padding: 40px 0;
  background: var(--color-bg-soft);
  mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
}

.tag-track {
  display: flex;
  gap: 14px;
  width: max-content;
  animation: scroll-left 32s linear infinite;
}

.tag-track:hover {
  animation-play-state: paused;
}

@keyframes scroll-left {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

.pain-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #fff;
  border: 1px solid var(--color-border);
  padding: 12px 20px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  white-space: nowrap;
  box-shadow: var(--shadow-sm);
}

/* =========================================================
   7. 카드 그리드 공용
========================================================= */
.grid {
  display: grid;
  gap: 24px;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 900px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 600px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

.card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px 26px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.card-icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  background: var(--color-primary-light);
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
}

.card-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
}

.card-desc {
  font-size: 15px;
  color: var(--color-text-sub);
}

/* 과목 카테고리 카드 (메인 홈페이지) */
.category-card {
  position: relative;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.category-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.category-card .category-emoji {
  font-size: 40px;
  margin-bottom: 20px;
}

.category-card h3 {
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 10px;
}

.category-card p {
  color: var(--color-text-sub);
  font-size: 15px;
  margin-bottom: 20px;
}

.category-card .sub-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.category-card .sub-list li {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 5px 12px;
  border-radius: 999px;
}

.category-card .card-link {
  font-weight: 700;
  color: var(--color-primary);
  font-size: 15px;
}

/* =========================================================
   8. 커리큘럼 단계
========================================================= */
.step-card {
  position: relative;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 30px 24px;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-weight: 800;
  font-size: 15px;
  margin-bottom: 18px;
}

/* =========================================================
   9. 강사 소개
========================================================= */
.instructor-card {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 36px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px;
  align-items: center;
}

@media (max-width: 700px) {
  .instructor-card {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .instructor-photo {
    margin: 0 auto;
  }
}

.instructor-photo {
  width: 220px;
  height: 220px;
  border-radius: var(--radius-md);
  background: linear-gradient(150deg, var(--color-primary-light), #dfe6fb);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 72px;
  color: var(--color-primary);
}

.instructor-name {
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 6px;
}

.instructor-role {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 16px;
}

.instructor-bio {
  color: var(--color-text-sub);
  margin-bottom: 20px;
}

.instructor-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.instructor-tags li {
  font-size: 13px;
  font-weight: 600;
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  padding: 6px 14px;
  border-radius: 999px;
}

.placeholder-note {
  display: inline-block;
  margin-top: 18px;
  font-size: 12px;
  color: var(--color-text-light);
  background: #fff8ec;
  border: 1px dashed #f0c987;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
}

/* =========================================================
   10. 강의 자료
========================================================= */
.material-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.material-thumb {
  height: 160px;
  background: linear-gradient(150deg, var(--color-primary), var(--color-primary-dark));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 44px;
  color: #fff;
}

.material-body {
  padding: 22px;
}

.material-body h4 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
}

.material-body p {
  font-size: 14px;
  color: var(--color-text-sub);
}

/* =========================================================
   11. 후기 카드
========================================================= */
.review-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px;
}

.review-stars {
  color: #ffb020;
  font-size: 14px;
  margin-bottom: 14px;
}

.review-grade {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 15px;
  margin-bottom: 14px;
}

.review-grade .before { color: var(--color-text-light); }
.review-grade .after { color: var(--color-primary); }

.review-text {
  font-size: 15px;
  color: var(--color-text);
  margin-bottom: 18px;
  line-height: 1.7;
}

.review-meta {
  font-size: 13px;
  color: var(--color-text-light);
  border-top: 1px solid var(--color-border);
  padding-top: 14px;
}

/* =========================================================
   12. 신뢰 지표 바
========================================================= */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

@media (max-width: 700px) {
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
}

.stats-bar b {
  display: block;
  font-size: 32px;
  font-weight: 800;
  color: var(--color-accent);
}

.stats-bar span {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.75);
}

/* =========================================================
   13. FAQ 아코디언
========================================================= */
.faq-item {
  border-bottom: 1px solid var(--color-border);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 4px;
  font-size: 16px;
  font-weight: 700;
  text-align: left;
}

.faq-question .q-icon {
  font-size: 20px;
  color: var(--color-text-light);
  transition: transform 0.2s ease;
  flex-shrink: 0;
  margin-left: 16px;
}

.faq-item.open .q-icon {
  transform: rotate(45deg);
  color: var(--color-primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.25s ease;
}

.faq-answer p {
  padding: 0 4px 22px;
  color: var(--color-text-sub);
  font-size: 15px;
}

/* =========================================================
   14. 최종 CTA 섹션
========================================================= */
.final-cta {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: #fff;
  text-align: center;
  padding: 88px 0;
}

.final-cta .section-title {
  color: #fff;
}

.final-cta .section-desc {
  color: rgba(255, 255, 255, 0.8);
  margin: 0 auto 32px;
}

.final-cta .btn-primary {
  background: #fff;
  color: var(--color-primary);
}

.final-cta .btn-primary:hover {
  background: #f0f0f0;
}

.final-cta .call-number {
  margin-top: 18px;
  font-size: 15px;
  color: rgba(255, 255, 255, 0.8);
}

/* =========================================================
   15. Footer
========================================================= */
.site-footer {
  background: #12141c;
  color: rgba(255, 255, 255, 0.6);
  padding: 56px 0 32px;
  font-size: 14px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 40px;
}

@media (max-width: 800px) {
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

.footer-grid h4 {
  color: #fff;
  font-size: 15px;
  margin-bottom: 16px;
}

.footer-grid li {
  margin-bottom: 10px;
}

.footer-grid a:hover {
  color: #fff;
}

.footer-logo {
  color: #fff;
  font-weight: 800;
  font-size: 18px;
  margin-bottom: 12px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13px;
}

/* =========================================================
   16. 모바일 하단 고정 CTA 바
========================================================= */
.mobile-sticky-cta {
  display: none;
}

@media (max-width: 768px) {
  .mobile-sticky-cta {
    display: flex;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 999;
    background: #fff;
    border-top: 1px solid var(--color-border);
    padding: 12px 16px;
    box-shadow: 0 -4px 16px rgba(0,0,0,0.08);
  }

  /* 모바일에서 하단 고정바만큼 여백 확보 */
  body {
    padding-bottom: 72px;
  }
}

/* =========================================================
   17. 스크롤 리빌 애니메이션
========================================================= */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* =========================================================
   18. 유틸리티
========================================================= */
.text-center { text-align: center; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }