.niko {
  color: #333;
  font-family: "Zen Old Mincho", serif;
  font-size: 16px;
  font-weight: 700;
  font-style: normal;
}

img {
  width: 100%;
  height: auto;
  vertical-align: middle;
}

a {
  display: inline-block;
  text-decoration: none;
}

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

.mb-0 {
  margin-bottom: 0 !important;
}

.pc {
  display: block;
}

.sp {
  display: none;
}

.sec-mv {
  background:
    linear-gradient(to right, #000 50%, transparent 20%),
    url("../img/niko/bg_mv.jpg") left center repeat;
  background-size: contain;
}

.main-visual {
  display: flex;
  max-width: 1920px;
  justify-content: center;
  width: 100%;
  margin: 0 auto;
}

.mv-content {
  display: flex;
}

.mv-img {
  flex: 1;
  width: 50%;
  max-width: 747px;
}

.mv-txt {
  display: flex;
  flex: 1;
  align-items: center;
  width: 50%;
  color: #f2e555;
  font-size: 32px;
  text-align: center;
}

.mv-h-txt {
  padding-left: 40px;
}

.mv-heading {
  width: 100%;
  margin: 0 auto;
  max-width: 276px;
  padding-bottom: 20px;
}

.mv-txt span {
  display: block;
  font-size: 18px;
}

/* content */
.content {
  padding: 60px 0 70px;
  background: url("../img/niko/bg_niko.png") repeat center;
  background-size: 10%;
}

.inner {
  width: 95%;
  margin: 0 auto;
  max-width: 1000px;
}

.hero-instrument {
  width: 100%;
  max-width: 471px;
}

.white-box {
  width: 100%;
  padding: 60px 40px;
  background-color: #fff;
}

.sec-hero {
  margin-bottom: 20px;
}

.sec-hero .white-box {
  position: relative;
  top: -40px;
  margin-left: auto;
  max-width: 809px;
}

.box-ttl {
  margin-bottom: 35px;
  font-size: 28px;
}

.about-niko {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
}

.about-niko .img-about {
  width: 145px;
  max-width: 145px;
}

.about-niko .txt {
  width: calc(100% - 185px);
}

/* instructor */
.sec-instructor {
  margin-bottom: 60px;
}

.sec-instructor .white-box {
  padding-bottom: 20px;
}

.instructor-lst {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 40px;
}

.instructor-item {
  width: 30.3%;
  margin-bottom: 35px;
  max-width: 250px;
}

.instructor-item+.instructor-item {
  margin-left: 60px;
}

.instructor-item:nth-of-type(3n+1) {
  margin-left: 0;
}

.instructor-img {
  margin-bottom: 16px;
}

.instructor-name {
  margin-bottom: 5px;
  font-size: 18px;
  text-align: center;
}

.view-profile {
  display: block;
  width: 85%;
  margin: 0 auto;
  padding: 7px;
  border: 1px solid #993333;
  background-color: #993333;
  color: #fff;
  font-size: 16px;
  text-align: center;
  border-radius: 20px;
}

.view-profile:hover {
  background-color: #fff;
  color: #993333;
  opacity: 1;
}

.view-profile span {
  display: inline-block;
  position: relative;
  padding-right: 20px;
}

.view-profile span::after {
  position: absolute;
  top: 50%;
  right: 0;
  width: 0;
  height: 0;
  content: "";
  transform: translateY(-50%);
  border-top: 6px solid transparent;
  border-bottom: 6px solid transparent;
  border-left: 10px solid #fff;
}

.view-profile:hover span::after {
  border-left: 10px solid #993333;
}

/* feature */
.sec-features {
  margin-bottom: 40px;
}

.feature-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.sec-features .white-box {
  width: 100%;
  margin-left: auto;
  max-width: 768px;
}

.feature-item.reverse {
  flex-direction: row-reverse;
}

.feature-item .txt {
  width: 54%;
}

.feature-ttl {
  margin-bottom: 10px;
  font-size: 21px;
}

.feature-img {
  width: 42%;
  max-width: 280px;
}

/* sec-course */

.sec-course {
  position: relative;
  padding-bottom: 222px;
}

.sec-course .white-box {
  width: 100%;
  margin-right: auto;
  max-width: 805px;
}

.txt-red {
  margin-bottom: 5px;
  color: #be3227;
}

p+.txt-red {
  margin-top: 30px;
}

.course-img {
  position: absolute;
  right: 0;
  z-index: 2;
  width: 100%;
  transform: translateY(-50%);
  max-width: 465px;
}

/* classroom */
.sec-classroom .white-box {
  padding-bottom: 20px;
}

.box-ttl .red {
  display: block;
  color: #993333;
  font-size: 24px;
  text-align: center;
}

.classroom-lst {
  display: flex;
  flex-wrap: wrap;
  padding: 0 33px;
}

.classroom-item {
  width: 33%;
  margin-bottom: 40px;
  max-width: 270px;
}

.classroom-item+.classroom-item {
  margin-left: 20px;
}

.classroom-item:nth-of-type(3n+1) {
  margin-left: 0;
}

.classroom-img {
  margin-bottom: 16px;
}

.cls-name {
  margin-bottom: 5px;
  font-size: 18px;
  text-align: center;
}

/* i-Pad */
@media screen and (min-width:769px) and (max-width:1100px) {

  .niko {
    font-size: 1.45vw;
  }

  .main-visual {
    display: flex;
  }

  .mv-img {
    flex: 1;
    width: 50%;
    max-width: 67.91vw;
  }

  .mv-txt {
    font-size: 2.91vw;
  }

  .mv-h-txt {
    padding-left: 3.64vw;
  }

  .mv-heading {
    max-width: 25.09vw;
    padding-bottom: 1.82vw;
  }

  .mv-txt span {
    font-size: 1.64vw;
  }

  /* content */
  .content {
    padding: 5.45vw 0 6.36vw;
  }

  .inner {
    max-width: 90.91vw;
    padding: 0;
  }

  .hero-instrument {
    max-width: 42.82vw;
  }

  .white-box {
    padding: 5.45vw 3.64vw;
  }

  .sec-hero {
    margin-bottom: 1.82vw;
  }

  .sec-hero .white-box {
    top: -3.64vw;
    max-width: 73.55vw;
  }

  .box-ttl {
    margin-bottom: 3.18vw;
    font-size: 2.55vw;
  }

  .about-niko .img-about {
    width: 13.18vw;
    max-width: 13.18vw;
  }

  .about-niko .txt {
    width: calc(100% - 16.82vw);
  }

  /* instructor */
  .sec-instructor {
    margin-bottom: 5.45vw;
  }

  .sec-instructor .white-box {
    padding-bottom: 1.82vw;
  }

  .instructor-lst {
    margin-top: 3.64vw;
  }

  .instructor-item {
    margin-bottom: 3.18vw;
    max-width: 22.73vw;
  }

  .instructor-item+.instructor-item {
    margin-left: 5.45vw;
  }

  .instructor-item:nth-of-type(3n+1) {
    margin-left: 0;
  }

  .instructor-img {
    margin-bottom: 1.82vw;
  }

  .instructor-name {
    margin-bottom: 0.45vw;
    font-size: 1.64vw;
  }

  .view-profile {
    padding: 0.64vw;
    font-size: 1.45vw;
    border-radius: 1.82vw;
  }

  .view-profile span {
    padding-right: 1.82vw;
  }

  .view-profile span::after {
    border-top: 0.55vw solid transparent;
    border-bottom: 0.55vw solid transparent;
    border-left: 0.91vw solid #fff;
  }

  .view-profile:hover span::after {
    border-left: 0.91vw solid #993333;
  }

  /* feature */
  .sec-features {
    margin-bottom: 3.64vw;
  }

  .feature-item {
    margin-bottom: 3.64vw;
  }

  .sec-features .white-box {
    max-width: 69.82vw;
  }

  .feature-ttl {
    margin-bottom: 0.91vw;
    font-size: 1.91vw;
  }

  .feature-img {
    max-width: 25.45vw;
  }

  /* sec-course */

  .sec-course {
    padding-bottom: 20.18vw;
  }

  .sec-course .white-box {
    max-width: 73.18vw;
  }

  .txt-red {
    margin-bottom: 0.45vw;
  }

  p+.txt-red {
    margin-top: 2.73vw;
  }

  .course-img {
    max-width: 42.27vw;
  }

  /* classroom */
  .sec-classroom .white-box {
    padding-bottom: 1.82vw;
  }

  .box-ttl .red {
    font-size: 2.18vw;
  }

  .classroom-lst {
    padding: 0 3vw;
  }

  .classroom-item {
    margin-bottom: 3.64vw;
    max-width: 24.55vw;
  }

  .classroom-item+.classroom-item {
    margin-left: 1.82vw;
  }

  .classroom-item:nth-of-type(3n+1) {
    margin-left: 0;
  }

  .classroom-img {
    margin-bottom: 1.45vw;
  }

  .cls-name {
    margin-bottom: 0.45vw;
    font-size: 1.64vw;
  }


}

/* SP */
@media screen and (max-width:768px) {
  .pc {
    display: none;
  }

  .sp {
    display: block;
  }

  .niko {
    font-size: 14px;
  }

  .mv-txt {
    font-size: 21px;
  }

  .mv-h-txt {
    padding-left: 0;
  }

  .mv-heading {
    max-width: 50%;
    padding-bottom: 15px;
  }

  .mv-txt span {
    font-size: 16px;
  }

  /* content */
  .content {
    padding: 40px 0 50px;
  }

  .sec-hero {
    margin-bottom: 30px;
  }

  .hero-instrument {
    width: 80%;
    max-width: 80%;
    margin: 0 auto 30px;
  }

  .white-box {
    padding: 30px 20px;
  }

  .sec-hero .white-box {
    position: static;
    max-width: 100%;
  }

  .box-ttl {
    margin-bottom: 25px;
    font-size: 24px;
  }

  .about-niko .img-about {
    width: 20%;
    max-width: 145px;
  }

  .about-niko .txt {
    width: 78%;
  }

  /* instructor */
  .sec-instructor {
    margin-bottom: 30px;
  }

  .sec-instructor .white-box {
    padding: 30px 20px 10px;
  }

  .instructor-lst {
    justify-content: flex-start;
    margin-top: 40px;
  }

  .instructor-item {
    width: 50%;
    margin-bottom: 35px;
    max-width: 47%;
  }

  .instructor-item+.instructor-item {
    margin-left: 6%;
  }

  .instructor-item:nth-of-type(2n+1) {
    margin-left: 0;
  }

  .instructor-img {
    margin-bottom: 10px;
  }

  .instructor-name {
    font-size: 15px;
  }

  .view-profile {
    font-size: 14px;
    padding: 6px 0;
    width: 95%;
  }

  .view-profile span {
    padding-right: 12px;
  }

  .view-profile span::after {
    border-top: 4px solid transparent;
    border-bottom: 4px solid transparent;
    border-left: 7px solid #fff;
  }

  .view-profile:hover span::after {
    border-left: 7px solid #993333;
  }

  /* feature */
  .feature-ttl {
    font-size: 18px;
    text-align: center;
  }

  .feature-item .txt {
    width: 100%;
  }

  .feature-img {
    width: 100%;
    max-width: 280px;
    margin: 0 auto 20px;
  }

  /* course */

  .course-img {
    position: static;
    transform: unset;
    max-width: 100%;
  }

  p+.txt-red {
    margin-top: 22px;
  }

  .sec-course {
    position: static;
    padding-bottom: 40px;
  }

  /* classroom */
  .sec-classroom .white-box {
    padding-bottom: 0;
  }

  .box-ttl .red {
    font-size: 21px;
  }

  .classroom-lst {
    padding: 0;
  }

  .classroom-item {
    width: 50%;
    margin-bottom: 40px;
    max-width: 48%;
  }

  .classroom-item+.classroom-item {
    margin-left: 4%;
  }

  .classroom-item:nth-of-type(2n+1) {
    margin-left: 0;
  }

  .classroom-img {
    margin-bottom: 10px;
  }

  .cls-name {
    font-size: 15px;
  }
}


@media screen and (max-width:640px) {

  .mv-txt {
    font-size: 3.08vw;
  }

  .mv-txt span {
    font-size: 2.61vw;
  }
}

@media screen and (max-width:480px) {
  .instructor-name {
    font-size: 3vw;
  }

  .view-profile {
    font-size: 2.72vw;
    padding: 1.25vw 0;
    width: 100%;
  }

  .cls-name {
    font-size: 3vw;
  }

  .view-profile span::after {
    border-top: 0.83vw solid transparent;
    border-bottom: 0.83vw solid transparent;
    border-left: 1.46vw solid #fff;
  }

  .view-profile:hover span::after {
    border-left: 1.46vw solid #993333;
  }

  .box-ttl .red {
    font-size: 18px;
  }

  .about-niko .txt {
    width: 100%;
  }

  .about-niko .img-about {
    width: 40%;
    margin: 20px auto;
  }



}