/* Linear Design System - Hero Component */
/* BEM 방법론: .linear-hero__element--modifier */

.linear-hero {
  position: relative;
  /* iOS Safari viewport 변화 대응: CSS 변수 사용 */
  min-height: 100vh;
  min-height: calc(var(--vh, 1vh) * 100);
  /* 초기에는 그라디언트만 표시 (빠른 렌더링) */
  background:
    linear-gradient(135deg,
      rgba(10, 18, 30, 0.7) 0%,
      rgba(15, 27, 46, 0.6) 20%,
      rgba(20, 35, 55, 0.5) 40%,
      rgba(25, 42, 65, 0.4) 60%,
      rgba(30, 50, 75, 0.3) 80%,
      rgba(35, 58, 85, 0.2) 100%),
    /* 저해상도 placeholder 색상 (이미지 로드 전) */
    linear-gradient(135deg, #1a2a3f 0%, #2d3e50 100%);
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
  /* 모바일 성능 개선: fixed attachment 제거 */
  background-attachment: scroll;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: visible;
  padding: 60px 0 20px;
  /* GPU 가속 활성화 (iOS Safari 성능 향상) */
  transform: translateZ(0);
  -webkit-transform: translateZ(0);
}

/* 배경 이미지를 점진적으로 로드 (데스크톱: WebP) */
.linear-hero.bg-loaded {
  background:
    linear-gradient(135deg,
      rgba(10, 18, 30, 0.7) 0%,
      rgba(15, 27, 46, 0.6) 20%,
      rgba(20, 35, 55, 0.5) 40%,
      rgba(25, 42, 65, 0.4) 60%,
      rgba(30, 50, 75, 0.3) 80%,
      rgba(35, 58, 85, 0.2) 100%),
    url('../images/background_hero.webp');
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
  background-attachment: scroll;
  transition: background 0.5s ease-in;
}

.linear-hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(circle at 20% 20%, rgba(255, 255, 255, 0.05) 0%, transparent 70%),
    radial-gradient(circle at 80% 80%, rgba(95, 178, 201, 0.03) 0%, transparent 70%),
    radial-gradient(circle at 40% 60%, rgba(163, 213, 224, 0.02) 0%, transparent 80%),
    radial-gradient(circle at 60% 30%, rgba(29, 47, 78, 0.05) 0%, transparent 60%);
  pointer-events: none;
}

.linear-hero__container {
  position: relative;
  z-index: 2;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--page-padding-inline, 24px);
  display: grid;
  grid-template-columns: minmax(360px, 1.1fr) 1.4fr;
  gap: 64px;
  align-items: stretch;
}

.linear-hero__brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  height: 100%;
  animation: slideInLeft 1s ease-out;
}

.linear-hero__logo {
  width: min(100%, 360px);
  max-width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  margin-bottom: 0;
  filter: drop-shadow(0 12px 40px rgba(29, 47, 78, 0.3));
  object-fit: contain;
  position: relative;
  z-index: 10;
}

.linear-hero__logo:hover {
  cursor: default;
  /* Changed from empty ruleset to satisfy lint */
}

.linear-hero__brand-text {
  display: flex;
  flex-direction: column;
  justify-content: center;
  height: 280px;
  gap: 8px;
}

.linear-hero__brand-title {
  font-family: "Inter Variable", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-weight: 680;
  font-size: 36px;
  color: white;
  margin: 0;
  letter-spacing: -1px;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.linear-hero__brand-subtitle {
  font-family: "Inter Variable", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-weight: 400;
  font-size: 18px;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 16px;
}

.linear-hero__brand-badge {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-8, 8px);
  font-family: "Inter Variable", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-weight: 510;
  font-size: 14px;
  color: white;
  backdrop-filter: blur(10px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.linear-hero__content {
  color: white;
  animation: slideInRight 1s ease-out 0.2s both;
}

.linear-hero__title {
  font-family: "Inter Variable", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-weight: 800;
  font-size: 56px;
  line-height: 1.2;
  margin-bottom: 24px;
  background: linear-gradient(135deg, #FFFFFF 0%, #E8F4F8 30%, #5FB2C9 70%, #A3D5E0 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -1.2px;
  word-break: keep-all;
  text-wrap: balance;
  animation: slideInRight 1s ease-out 0.4s both;
  text-shadow: 0 4px 20px rgba(255, 255, 255, 0.3), 0 2px 10px rgba(95, 178, 201, 0.2), 0 1px 5px rgba(0, 0, 0, 0.2);
  filter: drop-shadow(0 3px 6px rgba(255, 255, 255, 0.15));
}

.linear-hero__title-line {
  display: block;
  text-shadow: inherit;
  color: #ffffff;
  -webkit-text-fill-color: currentColor;
  background: none;
  -webkit-background-clip: border-box;
  background-clip: border-box;
}

.linear-hero__title-line--primary {
  font-size: 1em;
  letter-spacing: -1.4px;
}

.linear-hero__title-line--secondary {
  font-size: 0.92em;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.92);
  margin-top: 6px;
}

.linear-hero__title-line--tertiary {
  font-size: 0.78em;
  font-weight: 650;
  color: rgba(255, 255, 255, 0.86);
  margin-top: 10px;
  letter-spacing: 0.2px;
}

.linear-hero__subtitle {
  font-family: "Inter Variable", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-weight: 590;
  font-size: 24px;
  margin-bottom: 32px;
  color: #FFFFFF;
  letter-spacing: -0.5px;
  animation: slideInRight 1s ease-out 0.6s both;
  text-shadow: 0 4px 20px rgba(255, 255, 255, 0.5), 0 2px 10px rgba(95, 178, 201, 0.3), 0 1px 5px rgba(0, 0, 0, 0.4);
}

.linear-hero__description {
  font-family: "Inter Variable", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-weight: 400;
  font-size: 18px;
  line-height: 1.7;
  margin-bottom: 32px;
  color: rgba(255, 255, 255, 0.95);
  animation: slideInRight 1s ease-out 0.8s both;
  text-shadow: 0 3px 15px rgba(255, 255, 255, 0.4), 0 1px 5px rgba(95, 178, 201, 0.2), 0 1px 3px rgba(0, 0, 0, 0.3);
}

.linear-hero__highlight {
  font-family: "Inter Variable", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-weight: 590;
  font-size: 20px;
  color: #FFFFFF;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  text-align: center;
  padding: 22px 34px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.14), rgba(255, 255, 255, 0.08));
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: var(--radius-premium);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 12px 34px rgba(7, 18, 34, 0.28), 0 4px 16px rgba(0, 0, 0, 0.2);
  width: min(100%, 560px);
  max-width: 560px;
  margin: 0 auto 40px;
  animation: premium-fade-in-up 1s ease-out 1s both;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.linear-hero__highlight-title {
  font-size: 1.6rem;
  font-weight: 780;
  letter-spacing: -0.5px;
  line-height: 1.15;
}

.linear-hero__highlight-subtitle {
  font-size: 0.98rem;
  font-weight: 520;
  color: rgba(255, 255, 255, 0.9);
  line-height: 1.4;
}

.linear-hero__actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

@media (max-width: 768px) {
  .linear-hero__actions {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    max-width: 320px;
    margin: 0 auto;
  }
}

.linear-hero__scroll-hint {
  position: absolute;
  bottom: 72px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: rgba(255, 255, 255, 0.9);
  font-family: "Inter Variable", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-weight: 500;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.3s ease;
  animation: bounce 2s infinite;
  z-index: 20;
}

.linear-hero__scroll-hint:hover {
  color: white;
  transform: translateX(-50%) translateY(-4px);
}

.linear-hero__scroll-icon {
  width: 24px;
  height: 24px;
  border: 2px solid currentColor;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
}

@media (max-width: 768px) {
  .linear-hero__scroll-hint {
    bottom: max(24px, calc(16px + env(safe-area-inset-bottom)));
    font-size: 13px;
    gap: 6px;
  }

  .linear-hero__scroll-icon {
    width: 22px;
    height: 22px;
    font-size: 11px;
  }

  /* 공지사항 버튼과 더 알아보기 겹침 방지: 액션 아래 여백 확보 */
  .linear-hero__actions {
    margin-bottom: 80px;
  }
}

/* 배경 장식 요소 */
.linear-hero__decoration {
  position: absolute;
  opacity: 0.1;
  pointer-events: none;
  border-radius: 50%;
}

.linear-hero__decoration--1 {
  top: 10%;
  left: 5%;
  width: 80px;
  height: 80px;
  background: radial-gradient(circle, white 0%, transparent 70%);
  animation: float 4s ease-in-out infinite;
}

.linear-hero__decoration--2 {
  top: 20%;
  right: 10%;
  width: 60px;
  height: 60px;
  background: radial-gradient(circle, var(--penguin-skyblue) 0%, transparent 70%);
  animation: float 3s ease-in-out infinite reverse;
}

.linear-hero__decoration--3 {
  bottom: 30%;
  left: 15%;
  width: 100px;
  height: 100px;
  background: radial-gradient(circle, var(--iceberg-blue) 0%, transparent 70%);
  animation: float 5s ease-in-out infinite;
}

.linear-hero__decoration--4 {
  bottom: 20%;
  right: 20%;
  width: 70px;
  height: 70px;
  background: radial-gradient(circle, white 0%, transparent 70%);
  animation: float 3.5s ease-in-out infinite reverse;
}

/* 애니메이션 */
@keyframes float {

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

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

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-50px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(50px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes bounce {

  0%,
  20%,
  50%,
  80%,
  100% {
    transform: translateX(-50%) translateY(0);
  }

  40% {
    transform: translateX(-50%) translateY(-10px);
  }

  60% {
    transform: translateX(-50%) translateY(-5px);
  }
}

/* 반응형 디자인 */
@media (max-width: 1024px) {
  .linear-hero__container {
    grid-template-columns: 1fr;
    gap: 48px;
    text-align: center;
  }

  .linear-hero__content {
    text-align: center;
  }

  .linear-hero__logo {
    width: 300px;
    height: 300px;
  }

  .linear-hero__title {
    font-size: 48px;
  }

  .linear-hero__subtitle {
    font-size: 20px;
  }

  .linear-hero__description {
    font-size: 16px;
  }
}

@media (max-width: 768px) {
  .linear-hero {
    /* 모바일 브라우저 viewport 변화 대응: CSS 변수 사용 */
    min-height: 110vh;
    min-height: calc(var(--vh, 1vh) * 110);
    /* 버튼들이 잘리지 않도록 높이 증가 */
    padding: 80px 0 60px;
    /* 하단 패딩 증가 */
    /* 모바일 브라우저 viewport 변경 문제 해결 */
    background-position: center 70%;
    background-attachment: scroll;
    /* 모바일에서 배경 크기 고정하여 확대 방지 (iOS Safari & Android Chrome) */
    background-size: auto 100%;
    align-items: flex-start;
    padding-top: 80px;
    /* 상단 패딩 줄임 */
    margin-top: 0;
    /* 마진 제거 */
    /* GPU 가속 및 레이어 분리 (성능 최적화) */
    will-change: scroll-position;
    /* Android Chrome 추가 최적화 */
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
  }

  /* 모바일용 배경 이미지 */
  .linear-hero.bg-loaded {
    background:
      linear-gradient(135deg,
        rgba(10, 18, 30, 0.7) 0%,
        rgba(15, 27, 46, 0.6) 20%,
        rgba(20, 35, 55, 0.5) 40%,
        rgba(25, 42, 65, 0.4) 60%,
        rgba(30, 50, 75, 0.3) 80%,
        rgba(35, 58, 85, 0.2) 100%),
      url('../images/background-hero3.jpg');
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
    background-attachment: scroll;
  }

  .linear-hero__container {
    padding: 0 16px;
    gap: 32px;
  }

  .linear-hero__logo {
    width: 250px;
    height: 250px;
  }

  .linear-hero__brand-title {
    font-size: 24px;
  }

  .linear-hero__brand-subtitle {
    font-size: 16px;
  }

  .linear-hero__title {
    font-size: 36px;
  }

  .linear-hero__subtitle {
    font-size: 18px;
  }

  .linear-hero__description {
    font-size: 15px;
  }

  .linear-hero__highlight {
    font-size: 16px;
    padding: 20px;
  }

  .linear-hero__actions {
    flex-direction: column;
    align-items: center;
  }

  .linear-hero__button {
    width: 100%;
    max-width: 300px;
  }
}

@media (max-width: 480px) {
  .linear-hero {
    /* 모바일 브라우저 viewport 변화 대응: CSS 변수 사용 */
    min-height: 110vh;
    min-height: calc(var(--vh, 1vh) * 110);
    /* 버튼들이 잘리지 않도록 높이 증가 */
    padding: 80px 0 60px;
    /* 하단 패딩 증가 */
    align-items: flex-start;
    padding-top: 80px;
    /* 상단 패딩 줄임 */
    margin-top: 0;
    /* 마진 제거 */
    /* 모바일: 배경 설정 */
    background-attachment: scroll;
    /* 모바일 브라우저 확대 방지: 배경 크기 고정 (iOS Safari & Android Chrome) */
    background-size: auto 100%;
    /* 스크롤 성능 최적화 */
    -webkit-overflow-scrolling: touch;
    /* Android Chrome 최적화 */
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    perspective: 1000px;
  }

  /* 모바일용 배경 이미지 */
  .linear-hero.bg-loaded {
    background:
      linear-gradient(135deg,
        rgba(10, 18, 30, 0.7) 0%,
        rgba(15, 27, 46, 0.6) 20%,
        rgba(20, 35, 55, 0.5) 40%,
        rgba(25, 42, 65, 0.4) 60%,
        rgba(30, 50, 75, 0.3) 80%,
        rgba(35, 58, 85, 0.2) 100%),
      url('../images/background-hero3.jpg');
    background-size: cover;
    background-position: center center;
    background-attachment: scroll;
  }

  .linear-hero__container {
    padding: 0 12px;
    gap: 16px;
  }

  .linear-hero__logo {
    width: 200px;
    height: 200px;
  }

  .linear-hero__brand-title {
    font-size: 20px;
  }

  .linear-hero__brand-subtitle {
    font-size: 14px;
  }

  .linear-hero__title {
    font-size: 28px;
  }

  .linear-hero__subtitle {
    font-size: 16px;
  }

  .linear-hero__description {
    font-size: 14px;
  }

  .linear-hero__highlight {
    font-size: 14px;
    padding: 16px;
  }

  .linear-hero__button {
    padding: 14px 24px;
    font-size: 15px;
  }
}

@media (max-width: 360px) {
  .linear-hero {
    /* iOS Safari viewport 변화 대응: CSS 변수 사용 */
    min-height: 110vh;
    min-height: calc(var(--vh, 1vh) * 110);
    /* 버튼들이 잘리지 않도록 높이 증가 */
    padding: 80px 0 60px;
    /* 하단 패딩 증가 */
    align-items: flex-start;
    padding-top: 80px;
    /* 상단 패딩 줄임 */
    margin-top: 0;
    /* 마진 제거 */
    /* iOS Safari 확대 방지: 배경 크기 고정 */
    background-size: auto 100%;
  }

  .linear-hero__container {
    padding: 0 8px;
    gap: 12px;
  }

  .linear-hero__logo {
    width: 160px;
    height: 160px;
  }

  .linear-hero__brand-title {
    font-size: 18px;
  }

  .linear-hero__brand-subtitle {
    font-size: 13px;
  }

  .linear-hero__title {
    font-size: 24px;
  }

  .linear-hero__subtitle {
    font-size: 14px;
  }

  .linear-hero__description {
    font-size: 13px;
  }

  .linear-hero__highlight {
    font-size: 13px;
    padding: 12px;
  }

  .linear-hero__button {
    padding: 12px 20px;
    font-size: 14px;
  }
}