* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  background-color: #f5f5f5;
}
body {
  margin: 0;
  color: #111;
  background-color: #0f1115;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
a {
  text-decoration: none;
  color: inherit;
}
h1,
h2,
h3,
h4,
h5,
h6,
p,
ul {
  margin: 0;
  padding: 0;
}
li {
  list-style: none;
}

@keyframes view {
  0%,
  100% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.05);
  }
}

@keyframes movePage {
  0%,
  100% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.01);
  }
}

@keyframes Page1 {
  0% {
    opacity: 0;
  }

  100% {
    opacity: 1;
  }
}
.page {
  flex: 1;
  padding-top: 70px;
}




.Header {
  height: 70px;
  width: 100%;
  padding: 0 24px;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 999;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  border-bottom: 1px solid #ccc;
  border-bottom-left-radius: 15px;
  border-bottom-right-radius: 15px;
  background: #fff;
}

.header-lastImg {
  justify-self: start;
  display: flex;
  align-items: center;
  height: 100%;
}

.Header img {
  width: 110px;
  height: auto;
  max-height: 55px;
  object-fit: contain;
  display: block;
}

.header-ul {
  justify-self: center;
  display: flex;
  align-items: center;
  gap: 2rem;
  font-size: 1.4rem;
  font-weight: 500;
  color: #111;
  grid-column: 2;
}

.header-ul li {
  display: flex;
}

.header-ul a {
  padding: 6px 12px;
  border-radius: 999px;
  transition: background 0.2s ease;
  white-space: nowrap;
}
.header-ul a:hover {
  background: #f0f2f5;
  cursor: pointer;
}

.header-phone {
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 10px;
  grid-column: 3;
}

.header-phone p {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  color: #111;
  white-space: nowrap;
}

.header-call {
  display: block;
  text-align: center;
  border-right: 1px solid black;
  padding-right: 10px;
}

.header-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 50px;
  padding-left: 10px;
}
.header-cta:hover {
  opacity: 0.9;
}

.header-cta-img {
  width: 130px;
  height: 50px;
  object-fit: contain;
  display: block;
}

.menu-btn {
  display: none;
  border: none;
  background: transparent;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 4px;
  padding: 0;
  justify-self: center;
  grid-column: 2;
}
.menu-btn:hover {
  background: #f0f2f5;
}
.menu-btn .bar {
  width: 22px;
  height: 2px;
  background: #111;
  border-radius: 999px;
  display: block;
}

.mobile-nav {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: none;
}
.mobile-nav.show {
  display: block;
}
.mobile-nav-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
}
.mobile-nav-panel {
  position: absolute;
  top: 0;
  right: 0;
  height: 100%;
  width: min(300px, 85vw);
  background: #fff;
  padding: 16px 14px;
  transform: translateX(100%);
  transition: transform 0.25s ease;
  box-shadow: -10px 0 40px rgba(0, 0, 0, 0.2);
}
.mobile-nav.show .mobile-nav-panel {
  transform: translateX(0);
}
.mobile-nav-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 10px;
  border-bottom: 1px solid #e5e7eb;
}
.mobile-nav-close {
  border: none;
  background: transparent;
  font-size: 28px;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 8px;
  color: #111;
}
.mobile-nav-close:hover {
  background: #f3f4f6;
}
.mobile-nav-list {
  margin: 12px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.mobile-nav-list a {
  display: block;
  padding: 12px 10px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 1rem;
}
.mobile-nav-list a:hover {
  background: #f0f2f5;
}


.partner-img {
  width: 100%;
  min-height: 330px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
  box-sizing: border-box;
  background-color: #0f1115;
}

.img-text {
  color: white;
  text-align: center;
  text-shadow: 0 4px 18px rgba(0, 0, 0, 0.45);
  font-size: 1.8rem;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  background: none;
  border-radius: 12px;
  font-weight: 700;
}

#learn-more {
  padding: 12px 24px;
  border: none;
  border-radius: 0.5rem;
  color: #0056b3;
  background-color: #f0f0f0;
  cursor: pointer;
  margin: 0 auto;
  font-size: 20px;
  font-weight: bold;
  margin-top: 50px;
}

#learn-more .btn-text {
  display: inline-block;
  transition: transform 0.2s ease;
}

#learn-more:hover .btn-text {
  transform: scale(1.02);
}

.more-info {
  padding: 20px;
  width: 100%;
  background-color: #0f1115;
  font-size: 1.2rem;
  line-height: 2;
  font-weight: 400;
  color: white;
  box-sizing: border-box;
}

#consult {
  color: gray;
  font-size: 15px;
  font-weight: bold;
}

#advice {
  font-size: 12px;
  border-radius: 1.5rem;
  border: none;
  background: #c70004;
  color: white;
  width: 250px;
  font-weight: bold;
  font-size: 18px;
  transition: all 0.2s;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  margin-top: 100px;
  margin-bottom: 50px;
  padding: 14px 28px;
}

#advice:hover {
  background: #e01419;
}

#btn {
  text-align: center;
  padding: 12px 24px;
}

.service {
  font-weight: bold;
  font-size: larger;
  text-align: center;
  font-family: "Pretendard", sans-serif;
}

.col {
  color: #00adef;
  font-weight: bold;
}

.KOSS {
  display: block;
  font-weight: bold;
  font-size: 2rem;
  text-align: center;
}

#explain {
  max-width: 1200px;
  margin: 20px auto 0;
  padding: 0;
}

#KOSS-benefit {
  display: flex;
  margin-top: 30px;

  gap: 18px;
  justify-items: center;
}

.benefit {
  background: rgba(238, 243, 255, 0.06);
  border: 1px solid rgba(21, 50, 80, 0.35);
  border-radius: 0.5rem;
  padding: 20px;
  max-width: 290px;
  width: 100%;
  flex: 1 1 260px;
  text-align: left;
  background-color: #181a1f;
  border-radius: 15px;
}

.benefit p {
  font-size: 14px;
  font-weight: bold;
  word-break: keep-all;
  line-height: 1.5;
  text-align: center;
}

.benefit h2 {
  margin-bottom: 12px;
  margin-top: 0;
  display: block;
  font-size: 1.5em;
  font-weight: bold;
  text-align: center;
}

#img-explain {
  font-weight: bold;
  font-size: 16px;
  text-align: center;
  color: gray;
}

.img-info {
  flex-direction: column;
  gap: 20px;
}

#partner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  margin-bottom: 20px;
  font-size: 46px;
  font-weight: 700;
  margin-top: 90px;
}

#partner img {
  height: 1em;
  max-width: 1600px;

  vertical-align: middle;
}

#Vimeo-meet {
  text-align: center;
}

#Vimeo {
  width: 155px;
  height: 80px;
  margin-bottom: 10px;
  object-fit: contain;
  margin-right: 7px;
}

#KOSS {
  object-fit: contain;

  width: 145px;
  height: 80px;
}

.hongbo {
  margin-top: 110px;
}

.view-btn {
  display: flex;
}

.slider-btns {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin: 20px 0;
}

.slider-btns button {
  padding: 10px 20px;
  border: none;
  background: #333;
  color: white;
  cursor: pointer;
  border-radius: 5px;
}

.btn-text,
.arrow {
  color: #00adef;
}

#small-title {
  font-weight: 600;
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
}


.last {
  display: flex;
  width: 100%;
  justify-content: space-around;
  padding: 75px 20px;
  background-color: #f5f5f5;
  box-sizing: border-box;
  align-items: center;
  font-size: 14px;
  margin-top: auto;
  flex-shrink: 0;
}


.footer-pc {
  display: flex;
  justify-content: space-around;
  align-items: center;
  width: 100%;
  gap: 40px;
}

.last img {
  width: 230px;
}

.last-font {
  line-height: 20px;
}

.last-link {
  display: flex;
  flex-wrap: wrap;
  font-size: 15px;
  margin-bottom: 0.5rem;
  gap: 2px;
}
.last-link li {
  padding: 0 10px;
  border-right: 1px solid #ccc;
}
.last-link li:first-child {
  padding-left: 0;
}
.last-link li:last-child {
  border-right: none;
}
.last-link a {
  color: #111;
  text-decoration: none;
  font-size: 14px;
}
.last-link a:hover {
  text-decoration: underline;
}

.info-wrap {
  display: flex;
  gap: 43px;
  flex-wrap: wrap;
}
.info-wrap ul {
  display: flex;
  flex-direction: column;
  gap: 5px;
  line-height: 1.6;
  margin-bottom: 10px;
  color: #111;
  font-size: 13px;
}

.last-p {
  margin-top: 15px;
  font-size: 14px;
  color: #111;
}


.footer-inner {
  display: none;
}


.service-img {
  width: 350px;
  height: 300px;
  flex-shrink: 0;
}

.image-slider {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 60px;
  box-sizing: border-box;
  overflow: hidden;
}

.slider-window {
  width: 100%;
  overflow: hidden;
  margin-top: 50px;
}

.slider-track {
  display: flex;
  gap: 20px;
  transition: transform 0.6s cubic-bezier(0.22, 0.9, 0.31, 1);
}

.slider-item {
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  align-items: center;
  width: calc((100% - 40px) / 3);
  min-width: 0;
}

.slider-item img {
  width: 100%;
  height: 300px;
  object-fit: cover;
  display: block;
  border-radius: 10px;
}

.slider-item .short-explain {
  margin-top: 8px;
  text-align: center;
  font-size: 14px;
  color: white;
  font-weight: bold;
}

.nav-btn {
  background: rgba(0, 0, 0, 0.5);
  border: none;
  outline: none;
  padding: 10px 20px;
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  font-size: 40px;
  color: white;
  cursor: pointer;
  border-radius: 10px;
  z-index: 10;
}

#prev {
  left: 0;
}
#next {
  right: 0;
}


@media (min-width: 1600px) {
  .partner-img {
    height: 700px;
  }
}
@media (min-width: 2000px) {
  body {
    font-size: 1.1rem;
  }
  h1 {
    font-size: 2.6rem;
  }
  .partner-img {
    height: 800px;
  }
}
@media (min-width: 2560px) {
  body {
    font-size: 1.2rem;
  }
  h1 {
    font-size: 3rem;
  }
  .partner-img {
    height: 900px;
  }
}
@media (min-width: 3440px) {
  .partner-img {
    height: 1000px;
  }
}
@media (min-width: 3840px) {
  body {
    font-size: 1.3rem;
  }
  h1 {
    font-size: 3.3rem;
  }
  .partner-img {
    height: 1100px;
  }
}

@media (max-width: 1024px) {
  .header-call {
    display: none;
  }
}


@media (min-width: 769px) and (max-width: 905px) {
  .Header {
    grid-template-columns: auto 1fr auto auto;
  }
  .header-ul {
    display: none !important;
  }
  .menu-btn {
    display: flex !important;
    justify-self: center;
  }
  .header-call {
    display: none;
  }
}

@media (max-width: 1100px) and (min-width: 769px) {
  #KOSS-benefit {
    flex-wrap: wrap;
    gap: 14px;
  }
  .benefit {
    flex: 1 1 calc(50% - 14px);
    max-width: none;
    min-width: 0;
    word-break: keep-all;
  }
  .benefit h2 {
    font-size: clamp(1rem, 2.5vw, 1.4rem);
    text-align: center;
  }
  .benefit p {
    font-size: clamp(0.8rem, 1.8vw, 15px);
    text-align: center;
  }
}


@media (max-width: 768px) {
  .page {
    padding-top: 56px;
  }

   .Header {
    grid-template-columns: auto 1fr auto;
    padding: 0 14px;
    height: 56px;
  }
  .header-ul {
    display: none;
  }
  .menu-btn {
    display: inline-flex;
    justify-self: center;
  }
  .header-cta-img {
    width: 80px;
    height: 36px;
    display: block;
  }
  .header-call {
    display: none;
  }

  .partner-img {
    min-height: auto;
    padding: 50px 16px;
  }
  .img-text {
    font-size: 1.2rem;
    padding: 16px;
    max-width: 90%;
    position: static;
    transform: none;
  }
  #partner {
    font-size: clamp(1.2rem, 3.5vw, 2rem);
    margin-top: 60px;
    gap: 6px;
    flex-wrap: wrap;
    white-space: nowrap;
  }
  #partner img {
    height: 1em;
    width: auto;
  }
  #Vimeo {
    height: 1em;
    width: auto;
    margin-bottom: 0;
  }
  #KOSS {
    height: 1em;
    width: auto;
  }
  #small-title {
    font-size: clamp(0.85rem, 2.5vw, 1rem);
    line-height: 1.6;
    padding: 0 16px;
    word-break: keep-all;
  }

  .more-info {
    padding: 20px 16px;
    font-size: 1rem;
    line-height: 1.7;
  }
  #KOSS-benefit {
    flex-wrap: wrap;
    gap: 14px;
  }
  .benefit {
    flex: 1 1 calc(50% - 14px);
    max-width: none;
    min-width: 0;
    word-break: keep-all;
  }
  .benefit h2 {
    font-size: clamp(1rem, 3vw, 1.5em);
  }
  .benefit p {
    font-size: clamp(0.8rem, 2.2vw, 16px);
  }
  .hongbo {
    margin-top: 60px;
  }

  .image-slider {
    padding: 0 20px;
  }
  .slider-item {
    width: calc((100% - 32px) / 3);
    min-width: 0;
  }
  .slider-item img {
    height: 160px;
  }

  #btn {
    margin-top: 40px;
    margin-bottom: 40px;
  }

  
  .last {
    display: block;
    padding: 32px 20px;
    background-color: #f5f5f7;
    border-top: 1px solid #d2d2d7;
  }


  .footer-pc {
    display: none;
  }

  
  .footer-inner {
    display: block;
    padding: 0 20px;
  }

  .footer-accordion-wrap {
    display: flex;
    flex-direction: column;
  }

  .footer-group {
    border-bottom: 1px solid #d2d2d7;
  }
  .footer-group:first-child {
    border-top: 1px solid #d2d2d7;
  }
  .last img {
    width: 130px;
  }
  .footer-group-btn {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 0;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    color: #1d1d1f;
    text-align: left;
  }

  .footer-arrow {
    font-size: 12px;
    color: #6e6e73;
    transition: transform 0.25s ease;
    display: inline-block;
  }
  .footer-group.open .footer-arrow {
    transform: rotate(180deg);
  }

  .footer-group-list {
    list-style: none;
    margin: 0;
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
  }
  .footer-group.open .footer-group-list {
    max-height: 300px;
  }
  .footer-group-list li {
    padding: 10px 0;
    font-size: 13px;
    color: #6e6e73;
  }
  .footer-group-list a {
    color: #6e6e73;
    text-decoration: none;
    font-size: 13px;
  }
  .footer-group-list a:hover {
    color: #1d1d1f;
  }

  .footer-bottom {
    border-top: 1px solid #d2d2d7;
    padding: 16px 0 24px;
    display: flex;
    flex-direction: column;
    gap: 4px;
  }
  .footer-bottom p {
    font-size: 11px;
    color: #6e6e73;
    margin: 0;
    line-height: 1.6;
  }
  .footer-copy {
    margin-top: 6px !important;
    color: #1d1d1f !important;
    font-weight: 500;
  }
  
  #advice{
    margin-top: 40px;
    margin-bottom: 20px;
  }
}

@media (max-width: 540px) {
  .slider-track {
    flex-direction: column;
    transform: none !important;
    gap: 16px;
  }
  .slider-item {
    width: 100%;
    min-width: 0;
  }
  .slider-item img {
    width: 100%;
    height: auto;
  }
  .nav-btn {
    display: none;
  }
}

@media (max-width: 480px) {
  .Header {
    height: 52px;
    padding: 0 12px;
  }
  .Header img {
    width: 90px;
  }


  .partner-img {
    min-height: auto;
    padding: 50px 16px;
  }
  .img-text {
    font-size: 0.95rem;
    padding: 0 16px;
    max-width: 100%;
    line-height: 1.6;
    word-break: keep-all;
    position: static;
    transform: none;
  }
  .img-text br {
    display: none;
  }
  #partner {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    font-size: 1.1rem;
    margin-top: 30px;
    gap: 6px;
    text-align: center;
  }
  #partner img {
    height: 1.5em;
    width: auto;
  }
  #Vimeo {
    width: auto;
    height: 0.9em;
    margin-bottom: 0;
  }
  #KOSS {
    width: auto;
    height: 0.9em;
  }
  #small-title {
    font-size: 17px;
    padding: 0 16px;
    line-height: 1.5;
  }

  .more-info {
    padding: 16px 14px;
    font-size: 0.9rem;
    line-height: 1.6;
    word-break: keep-all;
  }
  .hongbo {
    margin-top: 40px;
  }
  .service {
    font-size: 1rem;
    padding: 0 10px;
    margin-bottom: 50px;
    margin-top: 70px;
  }
  #img-explain {
    font-size: 13px;
    padding: 0 10px;
  }
  #KOSS-benefit {
    flex-direction: column;
    gap: 12px;
  }
  .benefit {
    flex: none;
    width: 100%;
    max-width: 300px;
    margin: 0 auto;
    padding: 16px;
    margin-bottom: 25px;
  }
  .benefit h2 {
    font-size: 1.1rem;
    text-align: center;
    margin-bottom: 8px;
  }
  .benefit p {
    font-size: 0.9rem;
    text-align: center;
    line-height: 1.5;
  }

  body {
    word-break: keep-all;
  }



  .service-img{
    margin-bottom: 30px;
  }

  #advice{
    margin-top: 40px;
    margin-bottom: 20px;
  }
}

@media (min-width: 769px) and (max-width: 905px) {
  .Header {
    grid-template-columns: auto 1fr auto auto;
  }
  .header-ul {
    display: none !important;
  }
  .menu-btn {
    display: flex !important;
    justify-self: center;
  }
  .header-call {
    display: none;
  }
}



@media (max-width: 600px) {
  .page {
    padding-top: 56px;
  }

}

@media (max-width: 960px) {
  .header-call {
    display: none;
  }
  .header-cta {
    height: 44px;
    padding-left: 0;
  }
  .header-cta-img {
    width: 100px;
    height: 44px;
  }
  .sidebar {
    width: 180px;
    min-width: 180px;
  }
  .main {
    padding: 70px 24px 24px; 
  }
}


@media (max-width: 360px) {
  .Header {
    height: 56px;
    padding: 0 14px;
  }

  .Header img {
    width: 78px;
  }

  .page {
    padding-top: 48px;
  }

  #partner {
    font-size: 1.1rem !important;
    gap: 3px !important;
    flex-wrap: wrap;
    justify-content: center;
  }

  #Vimeo,
  #KOSS {
    height: 1.1em !important;
    width: auto !important;
  }

  #small-title {
    font-size: 0.88rem !important;
  }

  .benefit {
    width: 100%;
    max-width: 240px;
  }
}

@media(max-width: 320px){
  .moblie-break{
    display: block;
  }
}

.scroll-top-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  padding: 10px 22px;
  border: 1.5px solid #ccc;
  border-radius: 999px;
  background: #fff;
  color: #111;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, transform 0.2s;
}
.scroll-top-btn:hover {
  background: #111;
  color: #fff;
  border-color: #111;
  transform: translateY(-2px);
}
.scroll-top-btn--mobile {
  width: 100%;
  justify-content: center;
  margin-top: 14px;
  font-size: 14px;
}