/* =============================================================================
   OnlineT — style.css
   구조: 공통 스타일 → 레이아웃 → 컴포넌트 → 상태
   ============================================================================= */


/* =============================================================================
   1. 공통 스타일 (Common)
   ============================================================================= */

/* --- CSS Variables --- */
:root {
  --color-blue: #007aff;
  --color-blue-dark: #0153c4;
  --color-blue-light: #24bdfe;
  --color-black: #000000;
  --color-white: #ffffff;
  --color-text: #444444;
  --color-muted: #999999;
  --color-bg-light: #f5f6f8;
  --color-shadow: #e5ecf5;

  --font-family: 'Pretendard Variable', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --header-height: 100px;
  --radius-card: 24px;
  --radius-card-sm: 16px;
  --radius-hero: 56px;
  --transition-base: 0.3s ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  color: var(--color-black);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

ul {
  list-style: none;
}

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

button {
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
}

/* --- Typography helpers --- */
.text-accent {
  color: var(--color-blue);
  font-weight: 700;
}

.section-label {
  font-size: 24px;
  font-weight: 600;
  color: var(--color-blue);
  letter-spacing: -0.48px;
  line-height: 1.3;
}


/* =============================================================================
   2. 레이아웃 (Layout)
   ============================================================================= */

.page-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.main {
  flex: 1;
}

/* Shared section padding */
.section-pad {
  padding-top: 160px;
  padding-bottom: 160px;
}

/* Shared horizontal padding */
.section-x {
  padding-left: 100px;
  padding-right: 100px;
}


/* =============================================================================
   3. 컴포넌트 (Components)
   ============================================================================= */


/* --- Header --- */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  background-color: var(--color-white);
  transition: box-shadow var(--transition-base);
}

.header.is-scrolled {
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
}

.header__inner {
  display: flex;
  height: var(--header-height);
  align-items: center;
  justify-content: space-between;
  padding-left: 16px;
  padding-right: 16px;
  gap: 80px;
  margin: 0 auto;
  width: 100%;
  max-width: 1720px;
}

.header__logo {
  flex-shrink: 0;
}

.header__logo-svg {
  height: 42px;
  width: auto;
  display: block;
}

.header__nav {
  display: flex;
  gap: 32px;
  flex: 1;
}

.header__nav-link {
  font-size: 18px;
  font-weight: 500;
  color: var(--color-black);
  transition: color var(--transition-base);
}

.header__nav-link:hover {
  color: var(--color-blue);
}

.header__menu-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 32px;
  height: 32px;
}

.header__menu-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-black);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.contact__btn {
  display: inline-flex;
  height: 44px;
  padding: 10px 24px;
  justify-content: center;
  align-items: center;
  gap: 10px;
  border-radius: 999px;
  color: #ffffff;
  font-weight: 600;
  font-size: 18px;
  background: #007AFF;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.contact__btn:hover {
  background: #000000;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

/* Mobile nav open state */
.header__nav.is-open {
  display: flex;
}

.header__menu-btn.is-active .header__menu-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.header__menu-btn.is-active .header__menu-bar:nth-child(2) {
  opacity: 0;
}

.header__menu-btn.is-active .header__menu-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}


/* --- Hero Section --- */

.hero {
  padding-top: var(--header-height);
  padding-left: 16px;
  padding-right: 16px;
  max-width: 1720px;
  margin: 0 auto;
}

.hero__container {
  position: relative;
  width: 100%;
  height: 725px;
  border-radius: var(--radius-hero);
  overflow: hidden;
  background-color: var(--color-bg-light);
}

.hero__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  pointer-events: none;
}

.hero__bg--mobile {
  display: none;
}

.hero__content {
  position: relative;
  z-index: 10;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-left: 80px;
  padding-right: 80px;
}

.hero__title {
  font-size: 60px;
  font-weight: 600;
  color: var(--color-black);
  line-height: 1.2;
  letter-spacing: -1.2px;
}

.hero__badge-wrap {
  margin-top: 20px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 4px 20px 12px;
  font-size: 44px;
  font-weight: 500;
  color: var(--color-white);
  background: linear-gradient(90deg, #24BDFE 0%, #007AFF 100%);
  border-radius: 12px;
  line-height: 1.3;
  letter-spacing: -0.88px;
}

.hero__desc {
  margin-top: 48px;
  font-size: 26px;
  color: var(--color-text);
  line-height: 1.5;
  letter-spacing: -0.52px;
}


/* --- About Section --- */

.about {
  padding-top: 160px;
  padding-bottom: 160px;
  scroll-margin-top: 100px;
}

.about__inner {
  text-align: center;
}

.about__heading {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: center;
  font-size: 44px;
  font-weight: 600;
  color: var(--color-black);
  line-height: 1.3;
  letter-spacing: -0.88px;
}

.about__desc {
  margin-top: 50px;
  font-size: 20px;
  color: var(--color-text);
  line-height: 1.5;
  letter-spacing: -0.4px;
  padding-left: 16px;
  padding-right: 16px;
}


/* --- Business Section --- */

.business {
  background-color: var(--color-bg-light);
  scroll-margin-top: 100px;
}

.business_wrap {
  padding: 160px 16px;
  width: 100%;
  max-width: 1720px;
  margin: 0 auto;
}

.business__inner {
  max-width: 1920px;
  margin: 0 auto;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 40px;
}

.business__intro {
  flex: 0 1 694px;
  /* 694px 기준에서 축소 허용 */
  min-width: 0;
  /* 콘텐츠 min-width 제약 제거 */
}

.business__heading {
  margin-top: 24px;
  font-size: 38px;
  font-weight: 600;
  color: var(--color-black);
  line-height: 1.3;
  letter-spacing: -0.88px;
}

.business__desc {
  margin-top: 60px;
  font-size: 20px;
  color: var(--color-text);
  line-height: 1.5;
  letter-spacing: -0.4px;
}

.business__cards {
  display: flex;
  flex-direction: column;
  gap: 32px;
  flex: 0 1 800px;
  min-width: 0;
}

.biz-card {
  background-color: var(--color-white);
  border-radius: var(--radius-card);
  box-shadow: 0px 4px 24px 0px var(--color-shadow);
}

.biz-card__inner {
  display: flex;
  gap: 40px;
  padding: 40px;
  align-items: flex-start;
}

.biz-card__icon {
  width: 66px;
  height: 66px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.biz-card__icon svg {
  width: 100%;
  height: 100%;
}

.biz-card__body {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 32px;
  min-width: 0;
  /* 카드 내부 요소도 폭 초과 방지 */
}

.biz-card__header {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.biz-card__title {
  font-size: 32px;
  font-weight: 600;
  color: var(--color-black);
  line-height: 1.3;
  letter-spacing: -0.64px;
}

.biz-card__desc {
  font-size: 18px;
  color: var(--color-text);
  line-height: 1.3;
  letter-spacing: -0.48px;
}

.biz-card__features {
  display: flex;
  gap: 40px;
}

.biz-card__feature-list {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.biz-card__feature-list li {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 18px;
  color: var(--color-text);
  line-height: 1.3;
  letter-spacing: -0.36px;
}

.biz-card__feature-list li::before {
  content: '';
  display: block;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background-color: var(--color-text);
  flex-shrink: 0;
}


/* --- Values Section --- */

.values {
  width: 100%;
  max-width: 1720px;
  margin: 0 auto;
  padding: 160px 16px 200px;
}

.values__inner {
  max-width: 1920px;
  margin: 0 auto;
  display: flex;
  gap: 90px;
  align-items: flex-start;
}

.values__text {
  flex: 0 1 727px;
  /* 727px 기준에서 축소 허용 */
  min-width: 0;
}

.values__text-top {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.values__heading {
  font-size: 38px;
  font-weight: 600;
  color: var(--color-black);
  line-height: 1.3;
  letter-spacing: -0.88px;
}

.values__desc {
  margin-top: 60px;
  font-size: 20px;
  color: var(--color-text);
  line-height: 1.5;
  letter-spacing: -0.4px;
}

.values__grid {
  display: flex;
  flex: 0 1 900px;
  gap: 24px;
}

.values__col {
  display: flex;
  flex-direction: column;
  gap: 24px;
  width: 100%;
}

.values__col--offset {
  padding-top: 160px;
}

.val-card {
  position: relative;
  height: 280px;
  border-radius: var(--radius-card-sm);
  overflow: hidden;
}

.val-card__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.val-card__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, transparent, rgba(0, 0, 0, 0.30), rgba(0, 0, 0, 0.75));
}

.val-card__content {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  padding-bottom: 32px;
  padding-left: 43px;
  padding-right: 43px;
  text-align: center;
}

.val-card__title {
  font-size: 24px;
  font-weight: 600;
  color: var(--color-white);
  line-height: 1.3;
  letter-spacing: -0.48px;
}

.val-card__desc {
  margin-top: 12px;
  font-size: 16px;
  font-weight: 500;
  color: var(--color-white);
  line-height: 1.3;
  letter-spacing: -0.36px;
}


/* --- CTA Section --- */

.cta {
  position: relative;
  height: 400px;
  overflow: hidden;
}

.cta__bg {
  position: absolute;
  inset: 0;
}

.cta__bg-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.cta__gradient {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(to right,
      rgba(1, 83, 196, 0.8) 7.067%,
      rgba(1, 83, 196, 0.52) 46.73%,
      rgba(1, 83, 196, 0) 69.515%);
}

.cta__content {
  position: relative;
  z-index: 10;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 32px;
  padding-left: 16px;
  padding-right: 16px;
}

.cta__heading {
  font-size: 44px;
  font-weight: 600;
  color: var(--color-white);
  line-height: 1.3;
  letter-spacing: -0.88px;
  text-align: center;
}

.cta__btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 240px;
  height: 64px;
  border-radius: 9999px;
  border: 2px solid var(--color-white);
  background-color: rgba(255, 255, 255, 0.1);
  transition: background-color var(--transition-base);
}

.cta__btn:hover {
  background-color: rgba(255, 255, 255, 0.2);
}

.cta__btn-text {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-white);
}

.cta__btn-icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
}


/* --- Footer --- */

.footer {
  background-color: var(--color-black);
}

.footer__inner {
  max-width: 1720px;
  margin: 0 auto;
  padding: 80px 16px;
  display: flex;
  align-items: center;
  gap: 60px;
}

.footer__logo-link {
  flex-shrink: 0;
}

.footer__logo-svg {
  height: 53px;
  width: auto;
  display: block;
}

.footer__info {
  flex: 1;
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.footer__details {
  flex: 1;
  display: flex;
  gap: 32px;
  font-size: 18px;
  color: var(--color-white);
  line-height: 1.4;
  letter-spacing: -0.36px;
}

.footer__copyright {
  font-size: 16px;
  color: var(--color-muted);
  line-height: 1.4;
  letter-spacing: -0.32px;
  flex-shrink: 0;
}


/* =============================================================================
   4. 상태 (State) — 애니메이션
   ============================================================================= */

/* Scroll-triggered fade-in animation */
.anim-target {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

.anim-delay-1 {
  transition-delay: 0.15s;
}

.anim-delay-2 {
  transition-delay: 0.30s;
}

.anim-delay-3 {
  transition-delay: 0.45s;
}

/* About heading — 좌우 슬라이드 인
   ±40px: IntersectionObserver가 getBoundingClientRect() 기준으로 교차를 감지할 수 있는
   안전한 범위. 80vw 같은 과도한 값은 요소를 화면 밖으로 밀어내어
   Observer가 영원히 "비교차" 상태로 판단하는 버그를 유발함. */
.slide-from-left {
  opacity: 0;
  transform: translateX(-160px);
  transition: opacity 0.65s ease-out, transform 1.3s ease-out;
}

.slide-from-right {
  opacity: 0;
  transform: translateX(160px);
  transition: opacity 0.65s ease-out, transform 1.3s ease-out;
  transition-delay: 0.1s;
}

.slide-from-left.is-visible,
.slide-from-right.is-visible {
  opacity: 1;
  transform: translateX(0);
}


/* =============================================================================
   5. 반응형 (Responsive)
   ============================================================================= */


/* --- Tablet (≤ 10365px) --- */
@media (max-width: 1365px) {
  .business__inner {
    flex-wrap: wrap;
  }

  .business__desc {
    margin-top: 36px;
    font-size: 18px;
  }

  .business__cards {
    flex: none;
    width: 100%;
  }

  .biz-card__inner {
    gap: 60px;
    padding: 32px;
  }

  .biz-card__title {
    font-size: 26px;
  }

  .biz-card__features {
    gap: 20px;
  }

  .values__inner {
    flex-wrap: wrap;
  }

  .values__grid {
    flex-wrap: wrap;
    flex: 1 1 auto;
    width: 100%;
  }

  .values__col--offset {
    padding-top: 0px;
  }

  .cta {
    height: 340px;
  }
}


/* --- Tablet (≤ 1023px) --- */
@media (max-width: 1023px) {
  :root {
    --header-height: 72px;
  }

  /* Header */
  .header__inner {
    padding-left: 16px;
    padding-right: 16px;
    gap: 0;
  }

  .header__nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--color-white);
    flex-direction: column;
    gap: 0;
    padding: 8px 0 16px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    z-index: 100;
  }

  .header__nav-link {
    padding: 12px 24px;
    font-size: 16px;
  }

  .header__menu-btn {
    display: flex;
  }

  .contact__btn {
    height: 36px;
    padding: 10px 16px;
    font-size: 16px;
  }

  /* Hero */
  .hero {
    padding-left: 16px;
    padding-right: 16px;
  }

  .hero__container {
    height: 608px;
  }

  .hero__title {
    font-size: 44px;
  }

  .hero__badge {
    font-size: 32px;
  }

  .hero__desc {
    font-size: 20px;
  }

  /* About */
  .about__heading {
    font-size: 32px;
    letter-spacing: -0.64px;
    align-items: stretch;
  }

  /* Business */
  .business {
    padding-left: 16px;
    padding-right: 16px;
  }

  .business__inner {
    flex-direction: column;
    align-items: stretch;
  }

  .business__intro {
    flex: none;
    width: 100%;
    text-align: center;
    align-items: center;
  }

  .business__heading {
    font-size: 28px;
  }

  .business__cards {
    flex: none;
    width: 100%;
  }

  .biz-card__title {
    font-size: 24px;
  }

  .biz-card__desc {
    font-size: 18px;
  }

  /* Values */
  .values {
    padding-left: 16px;
    padding-right: 16px;
  }

  .values__inner {
    flex-direction: column;
    align-items: stretch;
  }

  .values__text {
    flex: none;
    /* column 방향 전환 시 flex-basis 리셋 */
    width: 100%;
    text-align: center;
    align-items: center;
  }

  .values__text-top {
    align-items: center;
  }

  .values__heading {
    font-size: 32px;
  }

  .values__col--offset {
    padding-top: 0;
  }

  .values__col {
    width: 100%;
  }

  .values__grid {
    width: 100%;
  }

  .cta {
    height: 300px;
  }

  .cta__heading {
    font-size: 34px;
  }

  /* Footer */
  .footer__inner {
    padding: 40px 16px;
    flex-direction: column;
    align-items: flex-start;
    gap: 24px;
  }

  .footer__info {
    flex-direction: column;
  }

}

/* --- Mobile Hero (≤ 768px) --- */
@media (max-width: 768px) {

  /* Hero */
  .hero__bg--desktop {
    display: none;
  }

  .hero__bg--mobile {
    display: block;
  }

  .hero__container {
    height: 680px;
    border-radius: var(--radius-hero);
  }

  .hero__content {
    padding: 60px 32px 0;
    justify-content: flex-start;
    align-items: center;
    text-align: center;
  }

  .hero__title {
    font-size: 38px;
    line-height: 1.28;
    letter-spacing: -0.76px;
  }

  .hero__badge-wrap {
    margin-top: 20px;
  }

  .hero__badge {
    font-size: 24px;
    padding: 12px 28px 14px;
    border-radius: 12px;
    letter-spacing: -0.48px;
  }

  .hero__desc {
    margin-top: 20px;
    font-size: 16px;
    line-height: 1.65;
    letter-spacing: -0.32px;
    max-width: 320px;
  }

  .contact__btn {
    display: none;
  }

  /* Footer */
  .footer__inner {
    padding: 40px 16px;
    flex-direction: column;
    align-items: flex-start;
    gap: 24px;
  }

  .footer__logo-svg {
    height: 34px;
  }

  .footer__info {
    flex-direction: column;
    gap: 12px;
  }

  .footer__details {
    flex-direction: column;
    gap: 8px;
    font-size: 15px;
    letter-spacing: -0.3px;
  }

  .footer__copyright {
    font-size: 12px;
    letter-spacing: -0.24px;
  }
}

/* --- Mobile (≤ 639px) --- */
@media (max-width: 639px) {
  :root {
    --header-height: 56px;
    --radius-hero: 24px;
  }

  /* Header */
  .header__logo-svg {
    height: 24px;
  }

  /* Hero */
  .hero {
    padding-top: var(--header-height);
  }

  .hero__container {
    /* height는 768px 블록(680px)에서 상속, 여기서는 재정의하지 않음 */
    border-radius: var(--radius-hero);
  }

  .hero__title {
    font-size: 32px;
    line-height: 1.2;
    letter-spacing: -0.64px;
  }

  .hero__badge-wrap {
    margin-top: 14px;
  }

  .hero__badge {
    font-size: 20px;
    padding: 10px 22px 12px;
    border-radius: 10px;
    letter-spacing: -0.4px;
  }

  .hero__desc {
    margin-top: 32px;
    font-size: 17px;
    letter-spacing: -0.32px;
  }

  /* About */
  .about {
    padding-top: 80px;
    padding-bottom: 80px;
  }

  .about__heading {
    font-size: 20px;
    gap: 6px;
    letter-spacing: -0.4px;
  }

  .about__desc {
    margin-top: 20px;
    font-size: 16px;
    letter-spacing: -0.32px;
  }

  /* Business */
  .business_wrap {
    padding-top: 80px;
    padding-bottom: 80px;
  }

  .business__heading {
    font-size: 20px;
    letter-spacing: -0.4px;
    margin-top: 10px;
  }

  .business__desc {
    margin-top: 32px;
    font-size: 16px;
    letter-spacing: -0.32px;
  }

  .business__intro {
    text-align: center;
  }

  .section-label {
    font-size: 18px;
    letter-spacing: -0.36px;
  }

  .business__cards {
    gap: 16px;
  }

  .biz-card__inner {
    flex-direction: column;
    gap: 24px;
    padding: 24px 40px 40px 40px;
  }

  .biz-card__title {
    font-size: 20px;
    letter-spacing: -0.4px;
  }

  .biz-card__desc {
    font-size: 16px;
    letter-spacing: -0.32px;
  }

  .biz-card__body {
    gap: 24px;
  }

  .biz-card__features {
    flex-direction: column;
    gap: 0;
  }

  .biz-card__feature-list {
    gap: 4px;
  }

  .biz-card__feature-list li {
    font-size: 16px;
    letter-spacing: -0.32px;
  }

  /* Values */
  .values {
    padding-top: 80px;
    padding-bottom: 80px;
  }

  .values__inner {
    gap: 40px;
    align-items: center;
  }

  .values__text {
    text-align: center;
  }

  .values__text-top {
    gap: 6px;
  }

  .values__heading {
    font-size: 20px;
    letter-spacing: -0.4px;
  }

  .values__desc {
    margin-top: 32px;
    font-size: 16px;
    letter-spacing: -0.32px;
  }

  .values__grid {
    flex-direction: column;
    flex: 1;
    gap: 16px;
    width: 100%;
  }

  .values__col {
    gap: 16px;
  }

  .val-card {
    height: 176px;
    border-radius: 10px;
  }

  .val-card__content {
    padding-bottom: 20px;
    padding-left: 16px;
    padding-right: 16px;
  }

  .val-card__title {
    font-size: 18px;
    letter-spacing: -0.36px;
  }

  .val-card__desc {
    margin-top: 8px;
    font-size: 15px;
    letter-spacing: -0.3px;
  }

  /* CTA */
  .cta {
    height: 200px;
  }

  .cta__content {
    gap: 16px;
  }

  .cta__heading {
    font-size: 20px;
    letter-spacing: -0.4px;
  }

  .cta__btn {
    width: 160px;
    height: 44px;
    gap: 6px;
  }

  .cta__btn-text {
    font-size: 16px;
  }

  .cta__btn-icon {
    width: 16px;
    height: 16px;
  }
}

/* --- Small Mobile (≤ 480px) --- */
@media (max-width: 480px) {

  /* Hero */
  .hero__container {
    height: 600px;
  }

  .hero__content {
    padding: 52px 24px 0;
  }

  .hero__title {
    font-size: 28px;
    letter-spacing: -0.56px;
  }

  .hero__badge {
    font-size: 18px;
    padding: 10px 20px 11px;
    border-radius: 10px;
  }

  .hero__desc {
    margin-top: 16px;
    font-size: 14px;
    max-width: 260px;
  }
}