:root {
  --design-w-base: 750; /* デザインの基準幅(px) */
  --design-w-tablet--font: 820;
  --design-w-tablet--view: 1024;
  --design-w-pc: 1920;
  --color-white: #ffffff;
  --color-black: #2D2D2D;
  --color-navy: #1D4984;
  --color-gold: #E3D594;
  --color-darkgold: #DBA73F;
  --color-red: #CF1212;
  --color-turquoise: #8ADCE4;
}

/*============================
全体
============================*/
html {
  font-size: 62.5%;
  margin: 0;
  padding: 0;
}
body {
  font-family: "Noto Sans JP", sans-serif;
  font-size: calc(28 / var(--design-w-base) * 100vw);
  font-weight: 500;
  line-height: 1;
  color: var(--color-black);
  letter-spacing: 0;
  margin: 0;
  padding: 0;
}
main {
  overflow-x: hidden;
  margin-bottom: 0;
}
a {
  color: var(--color-black);
  text-decoration: none;
}
img {
  width: 100%;
  height: auto;
  vertical-align: bottom;
}
li {
  list-style: none;
}
.serif {
  font-family: "Noto Serif JP", serif;
}

@media screen and (min-width: 769px) and (max-width: 1024px) {
  body {
    font-size: calc(28 / var(--design-w-tablet--font) * 100vw);
  }
}

@media screen and (min-width: 1025px) {
  body {
    font-size: calc(28 / var(--design-w-pc) * 100vw);
  }
}
/*============================
レイアウト
============================*/
.fv__container {
  position: relative;
  top: 0;
  left: 0;
}
.fv__pc-content,
.fv__fixed-slider {
  display: none;
}
.lp__content {
  position: relative;
  width: 100%;
  height: 100svh;
}
@media screen and (min-width: 769px) and (max-width: 1024px) {

}

@media screen and (min-width: 1025px) {
  .fv__pc-content {
    position: fixed;
    display: flex;
    justify-content: space-between;
    width: calc(1300 / var(--design-w-pc) * 100vw);
    height: calc(708 / var(--design-w-pc) * 100vw);
    top: 50%;
    left: calc(260 / 1920 * 100vw);
    transform: translateY(-50%);
    pointer-events: auto;
    z-index: 5;
  }
  .fv__pc-left-item {
    position: relative;
    width: calc(254 / var(--design-w-pc) * 100vw);
    display: flex;
    flex-flow: column;
    align-items: center;
  }
  .fv__pc-logo {
    width: calc(133 / var(--design-w-pc) * 100vw);
    margin-bottom: calc(22 / var(--design-w-pc) * 100vw);
  }
  .fv__pc-txt {
    writing-mode: vertical-rl;
    font-size: calc(32 / var(--design-w-pc) * 100vw);
    line-height: 1.2;
    letter-spacing: .22em;
    margin-bottom: calc(60 / var(--design-w-pc) * 100vw);
  }
  .fv__pc-btn {
    display: block;
    width: calc(254 / var(--design-w-pc) * 100vw);
    font-size: calc(24 / var(--design-w-pc) * 100vw);
    padding: calc(24 / var(--design-w-pc) * 100vw) 0;
    background-color: var(--color-navy);
    color: var(--color-white);
    border: 2px solid var(--color-navy);
    border-radius: 40px;
    text-align: center;
    cursor: pointer;
    transition: .3s;
  }
  .fv__pc-btn:hover {
    background-color: var(--color-white);
    color: var(--color-navy)
  }
  .fv__pc-right-item {
    position: relative;
    display: flex;
    flex-flow: column;
    justify-content: center;
    align-items: center;
  }
  .fv__official-btn {
    width: calc(153 / var(--design-w-pc) * 100vw);
    height: calc(153 / var(--design-w-pc) * 100vw);
    background-color: var(--color-gold);
    font-size: calc(20 / var(--design-w-pc) * 100vw);
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    transition: .3s;
  }
  .fv__official-btn:hover {
    opacity: .7;
  }
  .fv__fixed-slider {
    position: fixed;
    display: flex;
    align-items: center;
    gap: calc(34 / var(--design-w-pc) * 100vw);
    overflow: visible;
    top: 56%;
    transform: translateY(-50%);
  }
  /* スライド3枚のグループ */
  .slider-list {
    animation: scroll-left 35s infinite linear .5s both;
    display: flex;
    align-items: center;
    gap: calc(34 / var(--design-w-pc) * 100vw);
  }
  /* スライド */
  .slider-item-img {
    width: calc(972 / var(--design-w-pc) * 100vw);
    height: 100%;
  }
  /* CSSアニメーション */
  @keyframes scroll-left {
    from {
      transform: translateX(0);
    }
    to {
      transform: translateX(-100%);
    }
  }
  .lp__content {
    position: relative;
    width: 100%;
    max-width: calc(750 / var(--design-w-pc) * 100vw);
    height: 100svh;
    margin: 0 auto;
    box-shadow: 0 5px 15px -4px rgba(135, 148, 150, .6);
  }
}

@media (min-width: 1920px) {
  .lp__content {
    max-width: 750px; /* ← デザイン上の最大幅 */
  }
}
/*============================
切り替えファーストビュー
============================*/
#switching-fv {
  width: 100%;
  height: 100%;
}
.switching-fv__container {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  height: 100%;
  position: relative;
}
.switching-fv__disposable-content,
.switching-fv__cartridge-content {
  min-width: 0;
  display: flex;
  flex-flow: column;
  justify-content: flex-end;
}
.switching-fv__disposable-content {
  background: url("../img/disposable-bg.jpg") left top / cover no-repeat;
  align-items: center;
  gap: calc(24 / var(--design-w-base) * 100svh);
}
.switching-fv__cartridge-content {
  background: url("../img/cartridge-bg.jpg") right top / cover no-repeat;
  align-items: flex-start;
}
.switching-fv__disposable-img {
  width: calc(270 / var(--design-w-base) * 100vw);
}
.switching-fv__cartridge-img {
  width: calc(360 / var(--design-w-base) * 100vw);
  margin-left: 1.2rem;
  margin-bottom: calc(-32 / var(--design-w-base) * 100svh);
}
.switching-fv__txt-content {
  position: absolute;
  top: calc(8 / var(--design-w-base) * 100svh);
  left: 0;
  right: 0;
  text-align: center;
}
.switching-fv__logo {
  width: calc(230 / var(--design-w-base) * 100vw);
  height: 100%;
  margin: 0 auto calc(12 / var(--design-w-base) * 100svh);
}
.switching-fv__txt {
  font-size: calc(28 / var(--design-w-base) * 100vw);
  font-weight: bold;
  margin-bottom: calc(8 / var(--design-w-base) * 100svh);
}
.switching-fv__title {
  font-size: calc(58 / var(--design-w-base) * 100vw);
  font-weight: bold;
  color: var(--color-navy);
  line-height: 1.3;
  margin-bottom: calc(8 / var(--design-w-base) * 100svh);
}
.switching-fv__lg-title {
  font-size: calc(72 / var(--design-w-base) * 100vw);
}
.switching-fv__subtitle {
  font-size: calc(36 / var(--design-w-base) * 100vw);
  font-weight: 600;
  color: var(--color-darkgold);
  line-height: 1.2;
  margin-bottom: calc(16 / var(--design-w-base) * 100svh);
}
.switching-fv__features-content {
  display: flex;
  justify-content: space-around;
  align-items: center;
}
.switching-fv__features-disposable-txt {
  font-size: calc(28 / var(--design-w-base) * 100vw);
  font-weight: bold;
  line-height: 1.2;
  background-color: var(--color-white);
  color: var(--color-darkgold);
  padding: 0 calc(26 / var(--design-w-base) * 100vw) calc(4 / var(--design-w-base) * 100vh);
  border-radius: 8px;
  white-space: nowrap;
}
.switching-fv__features-disposable-sm-txt {
  font-size: calc(22 / var(--design-w-base) * 100vw);
}
.switching-fv__features-cartridge-txt {
  font-size: calc(28 / var(--design-w-base) * 100vw);
  font-weight: bold;
  line-height: 1.2;
  background-color: var(--color-white);
  color: var(--color-navy);
  padding: 0 calc(30 / var(--design-w-base) * 100vw) calc(4 / var(--design-w-base) * 100vh);
  border-radius: 999px;
  white-space: nowrap;
}
.switching-fv__features-cartridge-sm-txt {
  font-size: calc(22 / var(--design-w-base) * 100vw);
  font-weight: 500;
}
.disposable-btn__content {
  width: 100%;
  height: calc(80 / var(--design-w-base) * 100svh);
  color: var(--color-white);
  display: flex;
  flex-flow: column;
  justify-content: center;
  align-items: center;
  gap: calc(6 / var(--design-w-base) * 100vh);
  line-height: 1.5;
}
.disposable-btn {
  position: relative;
  font-size: calc(32 / var(--design-w-base) * 100vw);
  color: var(--color-white);
  padding: calc(5 / var(--design-w-base) * 100vh) calc(83 / var(--design-w-base) * 100vw) calc(7 / var(--design-w-base) * 100vh) calc(33 / var(--design-w-base) * 100vw);
  border: 2px solid var(--color-white);
  border-radius: 8px;
}
.disposable-btn__txt {
  font-size: calc(16 / var(--design-w-base) * 100vw);
}
.cartridge-btn{
  position: relative;
  width: 100%;
  height: calc(80 / var(--design-w-base) * 100svh);
  font-size: calc(32 / var(--design-w-base) * 100vw);
  color: var(--color-white);
  background: var(--color-darkgold);
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  line-height: 1.2;
  padding-right: calc(24 / var(--design-w-base) * 100vw);
  overflow: hidden;
  transition: background-color .35s ease, color .35s ease;
}
.cartridge-btn span{
  position: relative;
  z-index: 2;
}
.cartridge-btn::before{
  content:"";
  position:absolute;
  top:-110%;
  left:-170%;
  width:170%;                 /* ← 光の幅をさらに広げる */
  height:320%;
  transform: rotate(25deg);

  background: linear-gradient(
    90deg,
    rgba(255,255,255,0) 0%,
    rgba(255,255,255,.08) 30%,
    rgba(255,255,255,.30) 50%,
    rgba(255,255,255,.10) 70%,
    rgba(255,255,255,0) 100%
  );

  filter: blur(2.2px);
  mix-blend-mode: screen;
  pointer-events:none;

  animation: luxeSweep 3s ease-in-out infinite;  /* ← 間隔を短く */
  opacity:0;
}

.disposable-btn::after,
.cartridge-btn::after {
  content: '';
  position: absolute;
  top: 50%;
  right: calc(24 / var(--design-w-base) * 100vw);
  transform: translateY(-50%);
  width: 0;
  height: 0;
  border-top: 7px solid transparent;
  border-bottom: 7px solid transparent;
  border-left: 9px solid #fff;
}

@keyframes luxeSweep{
  0%   { left:-170%; opacity:0; }
  8%   { left:-170%; opacity:0; }      /* 待ち時間短め */

  18%  { opacity:.62; }                /* 入り */
  40%  { left:140%; opacity:.62; }     /* 横断 */

  52%  { left:140%; opacity:.26; }     /* 余韻 */
  70%  { left:140%; opacity:.12; }
  100% { left:140%; opacity:0; }
}

@keyframes textShine{
  0%   { background-position: 0% 50%; }
  100% { background-position: 100% 50%; }
}

@media screen and (min-width: 768px) and (max-width: 1024px) {
  .switching-fv__disposable-content {
    background: url("../img/disposable-bg.jpg") left center / cover no-repeat;
    gap: calc(32 / var(--design-w-tablet--view) * 100svh);
  }
  .switching-fv__cartridge-content {
    background: url("../img/cartridge-bg.jpg") right center / cover no-repeat;
    align-items: flex-end;
  }
  .switching-fv__disposable-img {
    width: calc(319 / var(--design-w-tablet--view) * 100vw);
  }
  .switching-fv__cartridge-img {
    width: calc(440 / var(--design-w-tablet--view) * 100vw);
    margin-left: 0;
    margin-bottom: calc(-56 / var(--design-w-tablet--view) * 100svh);
  }
  .switching-fv__txt-content {
    top: calc(8 / var(--design-w-tablet--view) * 100svh);
  }
  .switching-fv__logo {
    width: calc(230 / var(--design-w-tablet--view) * 100vw);
    margin: 0 auto calc(12 / var(--design-w-tablet--view) * 100svh);
  }
  .switching-fv__txt {
    font-size: calc(28 / var(--design-w-tablet--view) * 100vw);
    margin-bottom: calc(8 / var(--design-w-tablet--view) * 100svh);
  }
  .switching-fv__title {
    font-size: calc(58 / var(--design-w-tablet--view) * 100vw);
    margin-bottom: calc(8 / var(--design-w-tablet--view) * 100svh);
  }
  .switching-fv__lg-title {
    font-size: calc(72 / var(--design-w-tablet--view) * 100vw);
  }
  .switching-fv__subtitle {
    font-size: calc(36 / var(--design-w-tablet--view) * 100vw);
    margin-bottom: calc(16 / var(--design-w-tablet--view) * 100svh);
  }
  .switching-fv__features-disposable-txt {
    font-size: calc(32 / var(--design-w-tablet--font) * 100vw);
    padding: 0 calc(26 / var(--design-w-tablet--font) * 100vw) calc(4 / var(--design-w-tablet--font) * 100vh);
  }
  .switching-fv__features-disposable-sm-txt {
    font-size: calc(24 / var(--design-w-tablet--font) * 100vw);
  }
  .switching-fv__features-cartridge-txt {
    font-size: calc(32 / var(--design-w-tablet--font) * 100vw);
    padding: 0 calc(30 / var(--design-w-tablet--font) * 100vw) calc(4 / var(--design-w-tablet--font) * 100vh);
  }
  .switching-fv__features-cartridge-sm-txt {
    font-size: calc(24 / var(--design-w-tablet--font) * 100vw);
  }
  .disposable-btn__content {
    height: calc(108 / var(--design-w-tablet--view) * 100svh);
    gap: calc(6 / var(--design-w-tablet--view) * 100vh);
  }
  .disposable-btn {
    font-size: calc(32 / var(--design-w-tablet--font) * 100vw);
    padding: calc(5 / var(--design-w-tablet--font) * 100vh) calc(83 / var(--design-w-tablet--font) * 100vw) calc(7 / var(--design-w-tablet--font) * 100vh) calc(33 / var(--design-w-tablet--font) * 100vw);
  }
  .disposable-btn__txt {
    font-size: calc(16 / var(--design-w-tablet--font) * 100vw);
  }
  .cartridge-btn {
    height: calc(108 / var(--design-w-tablet--view) * 100svh);
    padding-right: calc(24 / var(--design-w-tablet--view) * 100vw);
  }
  .disposable-btn::after,
  .cartridge-btn::after {
    right: calc(24 / var(--design-w-tablet--view) * 100vw);
    border-top: 12px solid transparent;
    border-bottom: 12px solid transparent;
    border-left: 16px solid #fff;
  }
}

@media screen and (min-width: 1025px) {
  .switching-fv__disposable-content {
    background: url("../img/disposable-bg.jpg") left center / cover no-repeat;
    gap: calc(64 / var(--design-w-pc) * 100svh);
  }
  .switching-fv__cartridge-content {
    background: url("../img/cartridge-bg.jpg") right center / cover no-repeat;
    align-items: flex-end;
  }
  .switching-fv__disposable-img {
    width: calc(220 / var(--design-w-pc) * 100vw);
  }
  .switching-fv__cartridge-img {
    width: calc(290 / var(--design-w-pc) * 100vw);
    margin-left: 0;
    margin-bottom: calc(-80 / var(--design-w-pc) * 100svh);
  }
  .switching-fv__txt-content {
    top: calc(16 / var(--design-w-pc) * 100svh);
  }
  .switching-fv__logo {
    width: calc(180 / var(--design-w-pc) * 100vw);
    margin: 0 auto calc(20 / var(--design-w-pc) * 100svh);
  }
  .switching-fv__txt {
    font-size: calc(24 / var(--design-w-pc) * 100vw);
    margin-bottom: calc(20 / var(--design-w-pc) * 100svh);
  }
  .switching-fv__title {
    font-size: calc(54 / var(--design-w-pc) * 100vw);
    margin-bottom: calc(8 / var(--design-w-pc) * 100svh);
  }
  .switching-fv__lg-title {
    font-size: calc(68 / var(--design-w-pc) * 100vw);
  }
  .switching-fv__subtitle {
    font-size: calc(32 / var(--design-w-pc) * 100vw);
    margin-bottom: calc(36 / var(--design-w-pc) * 100svh);
  }
  .switching-fv__features-disposable-txt {
    font-size: calc(28 / var(--design-w-pc) * 100vw);
    padding: 0 calc(26 / var(--design-w-pc) * 100vw) calc(8 / var(--design-w-pc) * 100svh);
  }
  .switching-fv__features-disposable-sm-txt {
    font-size: calc(20 / var(--design-w-pc) * 100vw);
  }
  .switching-fv__features-cartridge-txt {
    font-size: calc(28 / var(--design-w-pc) * 100vw);
    padding: 0 calc(30 / var(--design-w-pc) * 100vw) calc(8 / var(--design-w-pc) * 100svh);
  }
  .switching-fv__features-cartridge-sm-txt {
    font-size: calc(20 / var(--design-w-pc) * 100vw);
  }
  .disposable-btn__content {
    height: calc(160 / var(--design-w-pc) * 100svh);
    gap: calc(6 / var(--design-w-pc) * 100vh);
  }
  .disposable-btn {
    font-size: calc(32 / var(--design-w-pc) * 100vw);
    padding: calc(5 / var(--design-w-pc) * 100vh) calc(83 / var(--design-w-pc) * 100vw) calc(7 / var(--design-w-pc) * 100vh) calc(33 / var(--design-w-pc) * 100vw);
  }
  .disposable-btn__txt {
    font-size: calc(16 / var(--design-w-pc) * 100vw);
  }
  .cartridge-btn {
    font-size: calc(32 / var(--design-w-pc) * 100vw);
    height: calc(160 / var(--design-w-pc) * 100svh);
    padding-right: calc(24 / var(--design-w-pc) * 100vw);
  }
  .disposable-btn::after,
  .cartridge-btn::after {
    right: calc(24 / var(--design-w-pc) * 100vw);
    border-top: 12px solid transparent;
    border-bottom: 12px solid transparent;
    border-left: 16px solid #fff;
    transition: transform .3s, border-left-color .3s;
  }
  .disposable-btn:hover {
    background-color: var(--color-white);
    color: var(--color-black);
  }
  .cartridge-btn:hover{
    background: var(--color-white);
    color: var(--color-darkgold);
  }

  /* ホバー時は背景スイープ停止 */
  .cartridge-btn:hover::before{
    opacity:0;
    animation:none;
  }
  .cartridge-btn:hover span{
    background: linear-gradient(
      110deg,
      var(--color-darkgold) 0%,
      #fff3c4 22%,
      var(--color-darkgold) 42%,
      #fff7dc 58%,
      var(--color-darkgold) 76%,
      #ffe8a3 92%,
      var(--color-darkgold) 100%
    );
    background-size: 240% 100%;
    -webkit-background-clip:text;
    -webkit-text-fill-color: transparent;
    animation: textShine 5s ease-in-out infinite; /* ← ゆっくりに */
  }
  /* ボタンhover時：矢印（色＋右移動） */
  .disposable-btn:hover::after {
    border-left-color: var(--color-black);
    transform: translateY(-50%) translateX(10px); /* 右へ少し */
  }
  .cartridge-btn:hover::after {
    border-left-color: var(--color-darkgold);
    transform: translateY(-50%) translateX(10px);
  }
}