/* Linear Design System - Footer Component */
/* BEM 방법론: .linear-footer__element--modifier */

.linear-footer {
  background: var(--penguin-navy);
  color: white;
  padding: 40px 0 24px;
  /* 패딩 축소 */
  position: relative;
  overflow: hidden;
}

.linear-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
}

.linear-footer__container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 var(--page-padding-inline, 24px);
}

.linear-footer__content {
  display: grid;
  grid-template-columns: 1.8fr 1fr 1fr 1fr;
  gap: 28px;
  margin-bottom: 32px;
}

.linear-footer__nav-group {
  display: flex;
  gap: 28px;
}

.linear-footer__brand {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.linear-footer__brand-logo {
  display: flex;
  align-items: center;
  gap: 16px;
  text-decoration: none;
  transition: transform 0.2s ease;
  margin-bottom: 8px;
}

.linear-footer__brand-logo:hover {
  transform: translateY(-1px);
}

.linear-footer__brand-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.linear-footer__brand-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  filter: brightness(0) invert(1);
  /* 로고를 하얀색으로 변경 */
}

.linear-footer__brand-text {
  font-family: "Inter Variable", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-weight: 680;
  font-size: 28px;
  color: white;
  letter-spacing: -0.5px;
  line-height: 1.2;
}

.linear-footer__brand-description {
  font-family: "Inter Variable", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-weight: 400;
  font-size: 16px;
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.6;
  max-width: 320px;
}

.linear-footer__sections {
  display: flex;
  gap: 48px;
  flex: 1;
  min-width: 0;
}

.linear-footer__kspo-notice {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 260px;
}

.linear-footer__kspo-text {
  font-family: "Inter Variable", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.55);
  line-height: 1.7;
}

.linear-footer__section {
  display: flex;
  flex-direction: column;
  gap: 16px;
  flex: 1;
}

.linear-footer__section-title {
  font-family: "Inter Variable", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-weight: 590;
  font-size: 16px;
  color: white;
  margin-bottom: 8px;
  letter-spacing: -0.2px;
}

.linear-footer__nav-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.linear-footer__nav-item {
  position: relative;
}

.linear-footer__nav-link {
  font-family: "Inter Variable", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-weight: 400;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  display: inline-block;
}

.linear-footer__nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--penguin-skyblue);
  transition: width 0.3s ease;
}

.linear-footer__nav-link:hover {
  color: white;
  transform: translateX(4px);
}

.linear-footer__nav-link:hover::after {
  width: 100%;
}

.linear-footer__social {
  display: flex;
  gap: 12px;
  margin-top: 8px;
}

.linear-footer__social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-6, 6px);
  background: rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  font-size: 18px;
}

.linear-footer__social-link:hover {
  background: var(--penguin-skyblue);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(95, 178, 201, 0.3);
}

.linear-footer__sns-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.linear-footer__sns-link {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 10px;
  text-decoration: none;
  color: rgba(255, 255, 255, 0.75);
  font-size: 13px;
  font-family: "Inter Variable", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  padding: 5px 6px;
  border-radius: 8px;
  transition: all 0.2s ease;
  min-height: unset;
  min-width: unset;
}

.linear-footer__sns-link:hover {
  color: white;
  background: rgba(255, 255, 255, 0.08);
  transform: translateX(3px);
}

/* 고정 가이드 박스 — 아이콘 시작점·텍스트 시작점 동일 */
.linear-footer__sns-icon-wrap {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  overflow: hidden;
  border-radius: 7px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 인스타그램 기준 */
.linear-footer__sns-icon-wrap .linear-footer__sns-icon {
  display: block;
  width: 28px;
  height: 28px;
  object-fit: cover;
}

/* 유튜브: 가로로 넓어 보이므로 살짝 작게 */
.linear-footer__sns-icon-wrap--youtube .linear-footer__sns-icon {
  width: 26px;
  height: 26px;
}

/* 카카오: 부피감 있어 더 작게 */
.linear-footer__sns-icon-wrap--kakao .linear-footer__sns-icon {
  width: 24px;
  height: 24px;
}

.linear-footer__divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  margin: 32px 0;
}

.linear-footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.linear-footer__legal-desc {
  font-family: "Inter Variable", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
}

.linear-footer__copyright {
  font-family: "Inter Variable", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-weight: 400;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
}

.linear-footer__legal {
  display: flex;
  gap: 24px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.linear-footer__legal-item {
  position: relative;
}

.linear-footer__legal-link {
  font-family: "Inter Variable", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-weight: 400;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
  text-decoration: none;
  transition: color 0.2s ease;
}

.linear-footer__legal-link:hover {
  color: rgba(255, 255, 255, 0.8);
}

.linear-footer__legal-item:not(:last-child)::after {
  content: '•';
  position: absolute;
  right: -12px;
  top: 0;
  color: rgba(255, 255, 255, 0.4);
}

/* 배경 장식 요소 */
.linear-footer__decoration {
  position: absolute;
  opacity: 0.05;
  pointer-events: none;
}

.linear-footer__decoration--1 {
  top: 20%;
  left: 10%;
  width: 80px;
  height: 80px;
  background: radial-gradient(circle, var(--penguin-skyblue) 0%, transparent 70%);
  border-radius: 50%;
  animation: float 6s ease-in-out infinite;
}

.linear-footer__decoration--2 {
  top: 60%;
  right: 15%;
  width: 60px;
  height: 60px;
  background: radial-gradient(circle, var(--iceberg-blue) 0%, transparent 70%);
  border-radius: 50%;
  animation: float 4s ease-in-out infinite reverse;
}

.linear-footer__decoration--3 {
  bottom: 20%;
  left: 20%;
  width: 40px;
  height: 40px;
  background: radial-gradient(circle, white 0%, transparent 70%);
  border-radius: 50%;
  animation: float 5s ease-in-out infinite;
}

@keyframes float {

  0%,
  100% {
    transform: translateY(0px);
  }

  50% {
    transform: translateY(-20px);
  }
}

/* 간소화된 푸터 (문제풀이/분석 페이지용) */
.linear-footer--simple {
  background: var(--penguin-navy);
  color: white;
  padding: 32px 0 24px;
  position: relative;
  overflow: hidden;
}

.linear-footer--simple::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
}

.linear-footer--simple .linear-footer__container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--page-padding-inline, 24px);
  text-align: center;
}

.linear-footer--simple .linear-footer__brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}

.linear-footer--simple .linear-footer__brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  transition: transform 0.2s ease;
}

.linear-footer--simple .linear-footer__brand-logo:hover {
  transform: translateY(-1px);
}

.linear-footer--simple .linear-footer__brand-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.linear-footer--simple .linear-footer__brand-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  filter: brightness(0) invert(1);
  /* 로고를 하얀색으로 변경 */
}

.linear-footer--simple .linear-footer__brand-text {
  font-family: "Inter Variable", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-weight: 680;
  font-size: 24px;
  color: white;
  letter-spacing: -0.5px;
  line-height: 1.2;
}

.linear-footer--simple .linear-footer__nav {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.linear-footer--simple .linear-footer__nav-link {
  font-family: "Inter Variable", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-weight: 400;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: color 0.2s ease;
}

.linear-footer--simple .linear-footer__nav-link:hover {
  color: white;
}

.linear-footer--simple .linear-footer__copyright {
  font-family: "Inter Variable", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-weight: 400;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
}

/* 반응형 — 중간 폭에서도 4열 유지, 간격만 조정 */
@media (max-width: 1024px) {
  .linear-footer__content {
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 20px;
  }
}

/* 모바일 푸터 최적화 - 모든 페이지 통일 */
@media (max-width: 768px) {
  .linear-footer {
    padding: 32px 0 20px;
  }

  .linear-footer__content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 24px;
    margin-bottom: 24px;
  }

  .linear-footer__section {
    align-items: flex-start;
    text-align: left;
    width: 100%;
  }

  .linear-footer__sns-list,
  .linear-footer__nav-list {
    align-items: flex-start;
  }

  .linear-footer__brand {
    align-items: center;
  }

  .linear-footer__brand-icon {
    width: 44px;
    height: 44px;
  }

  .linear-footer__brand-text {
    font-size: 20px;
  }

  .linear-footer__brand-description {
    font-size: 13px;
    margin-top: 4px;
  }

  .linear-footer__section {
    display: none;
    /* 모바일에서는 섹션 숨김 (공간 절약) */
  }

  .linear-footer__bottom {
    flex-direction: column;
    align-items: center;
    gap: 12px;
  }

  .linear-footer__copyright {
    font-size: 12px;
  }

  .linear-footer__legal {
    gap: 16px;
  }

  /* 슬림 모드 강제 적용 효과 */
  .linear-footer--mobile-slim .linear-footer__brand-description {
    display: none;
  }
}

/* ============================================
   슬림형 푸터 (Slim Mode)
   전체적인 높이를 최소화한 1줄/2줄 형태
   ============================================ */
.linear-footer--slim {
  padding: 24px 0;
}

.linear-footer--slim .linear-footer__content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0;
  gap: 24px;
}

.linear-footer--slim .linear-footer__section,
.linear-footer--slim .linear-footer__brand-description,
.linear-footer--slim .linear-footer__divider {
  display: none;
}

.linear-footer--slim .linear-footer__brand-logo {
  margin-bottom: 0;
}

.linear-footer--slim .linear-footer__brand-icon {
  width: 32px;
  height: 32px;
}

.linear-footer--slim .linear-footer__brand-text {
  font-size: 18px;
}

.linear-footer--slim .linear-footer__bottom {
  margin-top: 0;
}

@media (max-width: 768px) {
  .linear-footer--slim .linear-footer__content {
    flex-direction: column;
    gap: 12px;
  }
}

@media (max-width: 480px) {
  .linear-footer__container {
    padding: 0 16px;
  }

  .linear-footer__brand-icon {
    width: 40px;
    height: 40px;
    font-size: 20px;
  }

  .linear-footer__brand-text {
    font-size: 20px;
  }

  .linear-footer__brand-description {
    font-size: 14px;
  }

  .linear-footer__section-title {
    font-size: 15px;
  }

  .linear-footer__nav-link {
    font-size: 13px;
  }

  .linear-footer__social-link {
    width: 36px;
    height: 36px;
    font-size: 16px;
  }

  /* 모바일: 카카오 숨기고 인스타·유튜브 아이콘만 표시 */
  .linear-footer__sns-list li:has(.linear-footer__sns-icon-wrap--kakao) {
    display: none;
  }

  .linear-footer__sns-link span:last-child {
    display: none;
  }

  .linear-footer__sns-list {
    flex-direction: row;
    gap: 8px;
  }

  .linear-footer__sns-link {
    padding: 4px;
    gap: 0;
  }
}