*{
  box-sizing:border-box;
}

html{
  scroll-behavior:smooth;
}

body{
  margin:0;
  background:#edf3f2;
  color:#263f50;
  font-family:"Noto Sans JP","Hiragino Kaku Gothic ProN",Meiryo,sans-serif;
  line-height:1.8;
}

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

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

/* =========================
   HEADER
========================= */

header{
  position:fixed;
  top:0;
  left:0;
  width:100%;
  z-index:999;
  background:rgba(255,255,255,.82);
  backdrop-filter:blur(12px);
  border-bottom:1px solid rgba(38,63,80,.08);
}

.header-inner{
  height:72px;
  padding:0 6%;
  display:flex;
  justify-content:space-between;
  align-items:center;
}

.logo{
  margin:0;
  font-size:24px;
  font-weight:300;
  letter-spacing:.2em;
  color:#263f50;
}

/* =========================
   GNAV
========================= */

.gnav{
  display:flex;
  align-items:center;
  gap:10px;
}

.gnav > a{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  height:40px;
  padding:0 6px;
  margin:0;
  font-size:10px;
  letter-spacing:.16em;
  line-height:1;
  color:#526976;
  transition:.3s;
}

.gnav > a:hover{
  opacity:.55;
}

/* =========================
   DROPDOWN
========================= */

.gnav-dropdown{
  position:relative;
}

.gnav-trigger{
  position:relative;
  width:138px;
  height:40px;
  padding:0 34px 0 16px;
  background:rgba(255,255,255,.52);
  backdrop-filter:blur(12px);
  border:1px solid rgba(255,255,255,.72);
  border-radius:999px;
  color:#263f50;
  font-size:10px;
  letter-spacing:.16em;
  cursor:pointer;
  transition:.4s;
}

.gnav-trigger:hover{
  background:rgba(255,255,255,.82);
}

.gnav-trigger::after{
  content:"";
  position:absolute;
  top:50%;
  right:16px;
  width:6px;
  height:6px;
  border-right:1px solid #526976;
  border-bottom:1px solid #526976;
  transform:translateY(-70%) rotate(45deg);
  pointer-events:none;
}

.gnav-menu{
  position:absolute;
  top:52px;
  right:0;
  width:210px;
  padding:12px;
  background:rgba(255,255,255,.76);
  backdrop-filter:blur(18px);
  border:1px solid rgba(255,255,255,.82);
  border-radius:24px;
  box-shadow:0 20px 50px rgba(38,63,80,.08);
  opacity:0;
  visibility:hidden;
  transform:translateY(8px) scale(.98);
  transition:.35s ease;
  display:flex;
  flex-direction:column;
  gap:6px;
}

.gnav-dropdown:hover .gnav-menu{
  opacity:1;
  visibility:visible;
  transform:translateY(0) scale(1);
}

.gnav-menu a{
  display:flex;
  align-items:center;
  height:44px;
  padding:0 16px;
  border-radius:14px;
  font-size:10px;
  letter-spacing:.14em;
  color:#526976;
  transition:.3s;
}

.gnav-menu a:hover{
  background:rgba(255,255,255,.86);
  color:#263f50;
  transform:translateX(4px);
}

/* =========================
   KV
========================= */

.basspa-kv{
  position:relative;
  height:100vh;
  min-height:620px;
  overflow:hidden;
  background:#edf3f2;
}

.basspa-video{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:cover;
  opacity:.42;
  filter:brightness(1.08) blur(.3px);
  z-index:1;
}

.basspa-kv::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(
    to bottom,
    rgba(255,255,255,.12) 0%,
    rgba(237,243,242,.35) 55%,
    rgba(237,243,242,1) 100%
  );
  z-index:2;
}

.basspa-kv::before{
  content:"";
  position:absolute;
  left:0;
  bottom:0;
  width:100%;
  height:260px;
  background:linear-gradient(
    180deg,
    rgba(237,243,242,0) 0%,
    rgba(237,243,242,.95) 100%
  );
  z-index:3;
}

.basspa-kv-text{
  position:relative;
  z-index:4;
  height:100%;
  padding:72px 24px 0;
  display:flex;
  flex-direction:column;
  justify-content:center;
  align-items:center;
  text-align:center;
}

.basspa-sub{
  margin:0 0 22px;
  font-size:13px;
  letter-spacing:.32em;
  color:#6f8795;
}

.basspa-title{
  margin:0;
  font-size:82px;
  font-weight:300;
  letter-spacing:.22em;
  line-height:1;
  color:#263f50;
}

.basspa-copy{
  margin-top:30px;
  font-size:16px;
  letter-spacing:.12em;
  color:#4f6673;
}

/* =========================
   COPY SECTION
========================= */

.epsom-section{
  position:relative;
  width:100vw;
  margin-left:calc(50% - 50vw);
  min-height:700px;
  display:flex;
  align-items:center;
  justify-content:center;
  overflow:hidden;
}

.epsom-section::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:url("images/water-mist.jpg");
  background-size:100% auto;
  background-position:center top;
  background-repeat:no-repeat;
  opacity:.9;
  z-index:0;
  mask-image:linear-gradient(
    to bottom,
    transparent 0%,
    rgba(0,0,0,.15) 10%,
    rgba(0,0,0,.45) 22%,
    rgba(0,0,0,.8) 38%,
    #000 55%
  );
  -webkit-mask-image:linear-gradient(
    to bottom,
    transparent 0%,
    rgba(0,0,0,.15) 10%,
    rgba(0,0,0,.45) 22%,
    rgba(0,0,0,.8) 38%,
    #000 55%
  );
}

.epsom-section::after{
  content:"";
  position:absolute;
  left:0;
  bottom:0;
  width:100%;
  height:180px;
  background:linear-gradient(180deg, rgba(237,243,242,0), #edf3f2);
  z-index:1;
  pointer-events:none;
}

.epsom-inner{
  position:relative;
  z-index:2;
  width:100%;
  max-width:1000px;
  margin:0 auto;
  text-align:center;
}

.epsom-copy{
  margin:0;
  line-height:1.8;
}

.epsom-copy .char{
  display:inline-block;
  font-size:clamp(26px,3vw,44px);
  font-weight:300;
  letter-spacing:.2em;
  color:#1f2a31;
  opacity:0;
  filter:blur(10px);
  transform:translateY(10px);
}

.epsom-copy.is-show .char{
  animation:epsomCharIn .9s ease forwards;
  animation-delay:calc(var(--i) * .06s);
}

.epsom-lead{
  margin:28px auto 0;
  max-width:760px;
  font-size:14px;
  line-height:2.1;
  letter-spacing:.08em;
  color:rgba(38,63,80,.68);
}

@keyframes epsomCharIn{
  to{
    opacity:1;
    filter:blur(0);
    transform:translateY(0);
  }
}

/* =========================
   PRODUCT COMMON
========================= */

.basspa-products{
  position:relative;
  padding:24px 24px 100px;
  background:#edf3f2;
  z-index:6;
}

.basspa-category{
  max-width:1100px;
  margin:0 auto 100px;
}

.basspa-category:last-child{
  margin-bottom:0;
}

.basspa-category-title{
  margin:0 0 14px;
  text-align:center;
  font-size:36px;
  font-weight:300;
  letter-spacing:.18em;
  color:#263f50;
}

.basspa-category-lead{
  margin:0 0 48px;
  text-align:center;
  font-size:14px;
  letter-spacing:.08em;
  color:#6f8795;
}

.basspa-label{
  display:inline-block;
  margin-bottom:20px;
  font-size:11px;
  letter-spacing:.26em;
  color:#7b8d99;
}

/* =========================
   EPSOM CATEGORY
========================= */

.epsom-category{
  max-width:none;
  padding:80px 0 120px;
}

.epsom-wrap{
  position:relative;
  max-width:1180px;
  margin:0 auto;
  padding:60px;
  border-radius:42px;
  background:rgba(255,255,255,.82);
  backdrop-filter:blur(10px);
  border:1px solid rgba(255,255,255,.85);
  box-shadow:0 24px 70px rgba(38,63,80,.04);
}

.epsom-wrap::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  width:100%;
  height:1px;
  background:linear-gradient(90deg, transparent, rgba(255,255,255,.95), transparent);
}

.epsom-top{
  display:grid;
  grid-template-columns:420px 1fr;
  gap:70px;
  align-items:center;
}

.epsom-visual{
  display:flex;
  align-items:center;
  justify-content:center;
}

.epsom-image-wrap{
  width:100%;
  display:flex;
  align-items:center;
  justify-content:center;
  margin-bottom:13px;
}

.epsom-image-wrap img{
  width:100%;
  max-width:360px;
  max-height:420px;
  object-fit:contain;
  filter:drop-shadow(0 20px 40px rgba(38,63,80,.08));
}

/* =========================
   SLIDER
========================= */

.epsom-slider{
  position:relative;
  width:100%;
  max-width:380px;
  margin:0 auto;
}

.epsom-slider-window{
  width:100%;
  overflow:hidden;
}

.epsom-slider-track{
  display:flex;
  width:100%;
  transition:transform .5s ease;
}

.epsom-slider-slide{
  flex:0 0 100%;
  width:100%;
  display:flex;
  align-items:center;
  justify-content:center;
}

.epsom-slider-slide img{
  width:auto;
  max-width:100%;
  max-height:420px;
  object-fit:contain;
}

.epsom-arrow{
  position:absolute;
  top:50%;
  width:44px;
  height:44px;
  border:none;
  border-radius:50%;
  background:rgba(255,255,255,.82);
  backdrop-filter:blur(10px);
  color:#263f50;
  font-size:18px;
  cursor:pointer;
  transform:translateY(-50%);
  z-index:5;
  transition:.3s;
}

.epsom-arrow:hover{
  background:#263f50;
  color:#fff;
}

.epsom-arrow.prev{
  left:-18px;
}

.epsom-arrow.next{
  right:-18px;
}

/* =========================
   EPSOM CONTENT
========================= */

.epsom-content{
  max-width:560px;
}

.epsom-title{
  margin:18px 0 30px;
  font-size:52px;
  font-weight:300;
  letter-spacing:.12em;
  line-height:1.4;
  color:#263f50;
}

.epsom-copy-main{
  margin:0 0 30px;
  font-size:21px;
  line-height:2;
  letter-spacing:.08em;
  color:#314754;
}

.epsom-text{
  margin:0 0 20px;
  font-size:15px;
  line-height:2.3;
  letter-spacing:.04em;
  color:#526976;
}

.epsom-points{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:18px;
  margin-top:56px;
}

.epsom-point{
  padding:24px 20px;
  border-radius:22px;
  background:rgba(255,255,255,.46);
  border:1px solid rgba(255,255,255,.72);
  backdrop-filter:blur(10px);
  text-align:center;
  box-shadow:0 6px 20px rgba(38,63,80,.04);
}

.epsom-point span{
  display:block;
  margin-bottom:12px;
  font-size:11px;
  letter-spacing:.24em;
  color:#7b8d99;
}

.epsom-point p{
  margin:0;
  font-size:14px;
  line-height:1.8;
  color:#314754;
}

.epsom-btns{
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  gap:14px;
  margin-top:46px;
}

.epsom-btns .basspa-btn{
  width:auto;
  min-width:170px;
  height:54px;
  padding:0 28px;
  margin-top:0;
  font-size:11px;
  letter-spacing:.16em;
}

/* =========================
   CHLORIDE (layout reverse)
========================= */

#chloride .epsom-top{
  grid-template-columns:1fr 420px;
}

#chloride .epsom-visual{
  order:2;
}

#chloride .epsom-content{
  order:1;
}

/* =========================
   NORMAL PRODUCT
========================= */

.basspa-product{
  max-width:1100px;
  margin:0 auto 64px;
  display:grid;
  grid-template-columns:1fr 1fr;
  align-items:center;
  background:#fff;
  border-radius:32px;
  overflow:hidden;
}

.basspa-product.reverse .basspa-product-image{
  order:2;
}

.basspa-product-image{
  padding:44px;
}

.basspa-product-content{
  padding:52px;
}

.basspa-product-content h3{
  margin:0;
  font-size:38px;
  font-weight:300;
  line-height:1.5;
  letter-spacing:.06em;
}

.basspa-product-content p{
  margin:26px 0 0;
  font-size:15px;
  color:#526976;
}

/* =========================
   BUTTON
========================= */

.basspa-btn{
  position:relative;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:240px;
  height:58px;
  margin-top:38px;
  background:rgba(255,255,255,.42);
  backdrop-filter:blur(10px);
  border:1px solid rgba(38,63,80,.18);
  color:#263f50;
  font-size:12px;
  font-weight:500;
  letter-spacing:.28em;
  overflow:hidden;
  transition:.5s;
}

.basspa-btn::before{
  content:"";
  position:absolute;
  top:0;
  left:-120%;
  width:70%;
  height:100%;
  background:linear-gradient(120deg, transparent, rgba(255,255,255,.7), transparent);
  transition:left .8s ease;
}

.basspa-btn:hover{
  background:#263f50;
  color:#fff;
  border-color:#263f50;
  transform:translateY(-2px);
}

.basspa-btn:hover::before{
  left:140%;
}

/* =========================
   FEATURE
========================= */

.basspa-feature{
  position:relative;
  padding:140px 24px;
  background:linear-gradient(180deg, #edf3f2, #f8fbfb);
}

.feature-head{
  text-align:center;
  margin-bottom:90px;
}

.feature-sub{
  display:block;
  margin-bottom:18px;
  font-size:11px;
  letter-spacing:.32em;
  color:#8a9ba6;
}

.basspa-feature h2{
  margin:0;
  font-size:42px;
  font-weight:300;
  letter-spacing:.16em;
  color:#263f50;
}

.basspa-feature-list{
  max-width:1180px;
  margin:0 auto;
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:60px;
}

.basspa-feature-item{
  position:relative;
  padding:42px 36px;
  background:rgba(255,255,255,.46);
  backdrop-filter:blur(12px);
  border:1px solid rgba(255,255,255,.7);
  border-radius:30px;
  box-shadow:0 10px 40px rgba(38,63,80,.04);
}

.basspa-feature-item::after{
  content:"";
  position:absolute;
  top:0;
  left:0;
  width:100%;
  height:1px;
  background:linear-gradient(90deg, transparent, rgba(255,255,255,.95), transparent);
}

.feature-number{
  display:flex;
  align-items:center;
  gap:18px;
  margin-bottom:26px;
  font-size:12px;
  letter-spacing:.28em;
  color:#8a9ba6;
}

.feature-number::after{
  content:"";
  width:230px;
  height:1px;
  background:linear-gradient(90deg, rgba(38,63,80,.22), rgba(38,63,80,.04));
}

.basspa-feature-item h3{
  margin:0 0 22px;
  font-size:22px;
  font-weight:300;
  line-height:1.6;
  letter-spacing:.08em;
  color:#263f50;
}

.basspa-feature-item p{
  margin:0;
  font-size:14px;
  line-height:2.2;
  letter-spacing:.04em;
  color:#60727d;
}

/* =========================
   HOW TO
========================= */

.basspa-howto{
  padding:140px 24px;
  background:linear-gradient(180deg, #f8fbfb, #edf3f2);
}

.howto-wrap{
  max-width:1180px;
  margin:0 auto;
  padding:70px 60px;
  background:rgba(255,255,255,.46);
  backdrop-filter:blur(12px);
  border:1px solid rgba(255,255,255,.7);
  border-radius:42px;
}

.howto-sub{
  display:block;
  margin-bottom:18px;
  text-align:center;
  font-size:11px;
  letter-spacing:.32em;
  color:#8a9ba6;
}

.basspa-howto h2{
  margin:0 0 70px;
  text-align:center;
  font-size:42px;
  font-weight:300;
  letter-spacing:.16em;
  color:#263f50;
}

.howto-flow{
  display:grid;
  grid-template-columns:1fr auto 1fr auto 1fr;
  align-items:start;
  gap:20px;
}

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

.howto-number{
  display:block;
  margin-bottom:18px;
  font-size:12px;
  letter-spacing:.28em;
  color:#8a9ba6;
}

.howto-step h3{
  margin:0 0 18px;
  font-size:22px;
  font-weight:300;
  letter-spacing:.08em;
  color:#263f50;
}

.howto-step p{
  margin:0;
  font-size:14px;
  line-height:2.1;
  color:#60727d;
}

/* 線はステップ番号(12px) + margin(18px) + 見出し半分(約18px) の位置に揃える */
.howto-line{
  width:70px;
  height:1px;
  align-self:start;
  margin-top:48px;
  background:linear-gradient(90deg, rgba(38,63,80,.2), rgba(38,63,80,.04));
}

/* =========================
   FOOTER
========================= */

footer{
  background:#263f50;
  color:#fff;
  padding:24px 6%;
  text-align:center;
}

.footer-logo{
  margin:0;
  font-size:22px;
  font-weight:300;
  letter-spacing:.22em;
}

.footer-copy{
  margin:14px 0 0;
  font-size:11px;
  letter-spacing:.12em;
  color:rgba(255,255,255,.65);
}

/* =========================
   SP ( max-width: 768px )
========================= */

@media(max-width:768px){

  /* HEADER */

  .header-inner{
    height:64px;
  }

  .logo{
    font-size:20px;
  }

  .gnav{
    display:none;
  }


  /* KV */

  .basspa-kv{
    height:560px;
    min-height:560px;
  }

  .basspa-title{
    font-size:44px;
    letter-spacing:.18em;
  }

  .basspa-copy{
    font-size:14px;
  }


  /* COPY SECTION */

  .epsom-section{
    min-height:560px;
  }

  .epsom-section::before{
    background-size:auto 100%;
    background-position:center top;
  }

  .epsom-copy .char{
    font-size:clamp(14px,4.2vw,22px);
    letter-spacing:.08em;
  }

  .epsom-lead{
    padding:0 22px;
    font-size:13px;
  }


  /* PRODUCTS */

  .basspa-products{
    padding:0 20px 72px;
  }

  .epsom-category{
    padding:64px 0 88px;
  }

  .epsom-wrap{
    padding:42px 26px;
    border-radius:30px;
  }

  .epsom-top{
    grid-template-columns:1fr;
    gap:42px;
  }

  .epsom-image-wrap img{
    max-width:280px;
    max-height:none;
  }

  .epsom-content{
    max-width:none;
    text-align:center;
  }

  .epsom-title{
    font-size:29px;
  }

  .epsom-copy-main{
    font-size:16px;
    line-height:1.9;
  }
.epsom-text {
    font-size: 13px;
}
  .epsom-points{
    grid-template-columns:1fr;
    margin-top:42px;
    text-align:center;
  }

  .epsom-btns{
    display:grid;
    grid-template-columns:1fr;
    gap:14px;
  }

  .basspa-btn{
    width:100%;
    text-align:center;
  }


  /* CHLORIDE SP: reset reverse layout */

  #chloride .epsom-top{
    grid-template-columns:1fr;
  }

  #chloride .epsom-visual{
    order:0;
  }

  #chloride .epsom-content{
    order:0;
  }


  /* NORMAL PRODUCT */

  .basspa-product{
    grid-template-columns:1fr;
    margin:0 auto 48px;
    border-radius:28px;
    overflow:hidden;
  }

  .basspa-product.reverse .basspa-product-image{
    order:0;
  }

  .basspa-product-image{
    padding:32px 28px 20px;
  }

  .basspa-product-image img{
    max-width:280px;
    margin:0 auto;
    object-fit:contain;
  }

  .basspa-product-content{
    padding:0 28px 42px;
    text-align:center;
  }

  .basspa-product-content h3{
    font-size:28px;
    line-height:1.5;
  }

  .basspa-product-content p{
    font-size:14px;
    line-height:2;
  }


  /* FEATURE */

  .basspa-feature{
    padding:72px 20px;
    text-align:center;
  }

  .feature-head{
    margin-bottom:60px;
    text-align:center;
  }

  .feature-sub{
    display:block;
    text-align:center;
  }

  .basspa-feature h2{
    font-size:24px;
    text-align:center;
  }

  .basspa-feature-list{
    grid-template-columns:1fr;
    justify-items:center;
  }

  .basspa-feature-item{
    width:100%;
    text-align:center;
  }

  .feature-number{
    display:block;
    text-align:center;
  }


  /* HOW TO */

  .basspa-howto{
    padding:72px 22px;
  }

  .howto-wrap{
    padding:46px 28px;
    border-radius:30px;
  }

  .basspa-howto h2{
    margin-bottom:50px;
    font-size:24px;
  }

  .howto-flow{
    grid-template-columns:1fr;
    gap:34px;
  }

  .howto-line{
    width:1px;
    height:40px;
    margin:0 auto;
    background:linear-gradient(180deg, rgba(38,63,80,.2), rgba(38,63,80,.04));
  }

}