/* ============================================================
   mizuiro オールインワン美容液 — 上品ミニマル コスメLP
   水色 × 白 × アッシュ / 固有アニメ=商品ピン留め追従・拡大リビール・しずく
   ============================================================ */
:root{
  --bg:#FAFDFE;            /* ほぼ白（淡い水色寄り） */
  --bg-tint:#E9F4F7;       /* 淡い水色面 */
  --water:#4FB3C4;         /* 水色アクセント */
  --water-d:#2F8E9F;
  --water-soft:#BFE4EA;
  --ink:#2A3942;           /* 本文（アッシュ） */
  --ink-soft:#5E727B;
  --mute:#93A6AE;
  --line:#DCEBEF;
  --maxw:1180px;
  --shadow:0 30px 70px -34px rgba(38,90,102,.4);
  --shadow-sm:0 12px 30px -18px rgba(38,90,102,.34);
  --ease:cubic-bezier(.2,.7,.2,1);
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{background:var(--bg);color:var(--ink);
  font-family:'Zen Kaku Gothic New',-apple-system,sans-serif;font-weight:400;line-height:1.95;font-size:16px;
  font-feature-settings:"palt" 1;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.en{font-family:'Italiana',serif;letter-spacing:.02em}
.mincho{font-family:'Noto Serif JP',serif}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 clamp(20px,5vw,40px)}
.wrap--narrow{max-width:780px}

/* 画像スロット */
.imgslot{position:relative;overflow:hidden;background:linear-gradient(135deg,#EAF4F7,#DCECF0)}
.imgslot img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:2}
.imgslot--bottle img,.imgslot--bottle2 img,.imgslot--cta img{object-fit:contain}
.imgslot__ph{position:absolute;inset:0;z-index:1;display:flex;align-items:center;justify-content:center;
  text-align:center;color:var(--mute);font-family:'Noto Serif JP',serif}
.imgslot__ph em{font-style:normal;font-size:12.5px;letter-spacing:.06em;line-height:1.7;opacity:.85}

/* backbar */
.backbar{position:fixed;left:clamp(14px,3vw,22px);bottom:20px;z-index:60;font-size:11px;letter-spacing:.12em;
  color:var(--ink);background:rgba(255,255,255,.85);backdrop-filter:blur(5px);padding:9px 16px;
  border:1px solid var(--line);border-radius:30px;transition:.25s var(--ease)}
.backbar:hover{color:var(--water-d);border-color:var(--water)}

/* nav */
.nav{position:fixed;top:0;left:0;width:100%;z-index:100;display:flex;align-items:center;justify-content:space-between;
  padding:20px clamp(20px,5vw,40px);transition:.4s var(--ease)}
.nav.is-stuck{background:rgba(250,253,254,.9);backdrop-filter:blur(10px);padding-top:13px;padding-bottom:13px;border-bottom:1px solid var(--line)}
.nav__brand{font-family:'Italiana',serif;font-size:27px;color:var(--ink);letter-spacing:.04em}
.nav__links{display:flex;align-items:center;gap:clamp(14px,2.2vw,30px);font-size:13px;font-weight:500;color:var(--ink-soft)}
.nav__links a:hover{color:var(--water-d)}
.nav__cta{color:#fff!important;background:var(--water);padding:9px 22px;border-radius:30px}
.nav__cta:hover{background:var(--water-d)}
@media(max-width:780px){.nav__links a:not(.nav__cta){display:none}}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:9px;padding:15px 30px;border-radius:40px;font-size:14px;font-weight:500;
  letter-spacing:.04em;transition:.3s var(--ease)}
.btn .ar{transition:transform .3s var(--ease)}.btn:hover .ar{transform:translateX(5px)}
.btn--fill{background:var(--water);color:#fff;box-shadow:0 12px 26px -12px rgba(79,179,196,.7)}
.btn--fill:hover{background:var(--water-d);transform:translateY(-2px)}
.btn--ghost{background:transparent;color:var(--ink);border:1px solid var(--line)}
.btn--ghost:hover{border-color:var(--water);color:var(--water-d)}
.btn--lg{padding:18px 40px;font-size:15px}

.eyebrow{display:inline-block;font-family:'Italiana',serif;font-size:17px;letter-spacing:.16em;color:var(--water-d);margin-bottom:14px}
.sechead{text-align:center;max-width:720px;margin:0 auto clamp(40px,5vw,58px)}
.sectitle{font-weight:500;font-size:clamp(24px,3.6vw,38px);line-height:1.55;color:var(--ink);letter-spacing:.02em}
.sec__lead{margin-top:16px;color:var(--ink-soft);font-size:14.5px;line-height:1.95}
.disc{margin-top:18px;font-size:11.5px;color:var(--mute)}

/* blobs（水色のにじみ） */
.blob{position:absolute;border-radius:50%;filter:blur(50px);opacity:.5}
.blob--1{width:520px;height:520px;background:#CFEAF0;right:-8%;top:-12%}
.blob--2{width:360px;height:360px;background:#E4F4D9;left:-6%;bottom:6%;opacity:.4}
.blob--3{width:480px;height:480px;background:#CFEAF0;left:50%;top:-20%;transform:translateX(-50%)}

/* ============================================================
   HERO
   ============================================================ */
.hero{position:relative;overflow:hidden;padding:140px 0 90px;
  background:radial-gradient(120% 110% at 80% -10%,#E9F6F8 0%,#FAFDFE 60%)}
.hero__bg{position:absolute;inset:0;z-index:0}
.hero__in{position:relative;z-index:2;max-width:var(--maxw);margin:0 auto;padding:0 clamp(20px,5vw,40px);
  display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(28px,5vw,60px);align-items:center}
.hero__eyebrow{display:inline-block;font-family:'Italiana',serif;font-size:18px;letter-spacing:.16em;color:var(--water-d);margin-bottom:20px}
.hero__h1{font-family:'Noto Serif JP',serif;font-weight:500;font-size:clamp(32px,5.4vw,58px);line-height:1.42;color:var(--ink);letter-spacing:.02em}
.hero__lead{margin-top:26px;color:var(--ink-soft);font-size:15.5px;line-height:2.1;max-width:460px}
.hero__cta{display:flex;gap:14px;flex-wrap:wrap;margin-top:34px}
.hero__note{margin-top:24px;font-size:11px;color:var(--mute)}
.hero__product{position:relative;justify-self:center}
.imgslot--bottle{width:min(78vw,400px);aspect-ratio:3/4;border-radius:18px;background:
  radial-gradient(80% 70% at 50% 38%,#fff,#E4F2F5);box-shadow:var(--shadow)}
.hero__cap{position:absolute;right:-6px;bottom:18px;font-size:22px;color:var(--ink);background:rgba(255,255,255,.7);
  backdrop-filter:blur(4px);padding:6px 16px;border-radius:30px}
.hero__cap span{color:var(--water-d);font-size:15px}
.hero__scroll{position:absolute;left:50%;bottom:18px;transform:translateX(-50%);z-index:3;font-family:'Italiana',serif;
  font-size:13px;letter-spacing:.3em;color:var(--mute);writing-mode:vertical-rl;animation:bob 2.4s var(--ease) infinite}
@keyframes bob{0%,100%{transform:translate(-50%,0);opacity:.5}50%{transform:translate(-50%,8px);opacity:1}}
@media(max-width:820px){.hero__in{grid-template-columns:1fr;gap:36px;text-align:center}.hero__lead{margin-left:auto;margin-right:auto}.hero__cta{justify-content:center}.hero__scroll{display:none}}

/* ============================================================
   PROBLEM
   ============================================================ */
.prob{padding:clamp(70px,9vw,110px) 0;background:var(--bg-tint)}
.prob__grid{list-style:none;display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.prob__grid li{background:#fff;border-radius:16px;padding:34px 28px;box-shadow:var(--shadow-sm);text-align:center}
.prob__q{display:block;font-size:30px;color:var(--water);margin-bottom:12px}
.prob__grid p{font-size:14.5px;color:var(--ink-soft);line-height:1.9}
@media(max-width:760px){.prob__grid{grid-template-columns:1fr;gap:14px}}

/* ============================================================
   BENEFIT（左ボトルをピン留め・右テキスト追従）
   ============================================================ */
.benefit{padding:clamp(70px,9vw,120px) 0}
.benefit__grid{max-width:var(--maxw);margin:0 auto;padding:0 clamp(20px,5vw,40px);
  display:grid;grid-template-columns:.9fr 1.1fr;gap:clamp(30px,6vw,80px);align-items:start}
.benefit__sticky{position:sticky;top:0;height:100vh;display:flex;align-items:center;justify-content:center}
.benefit__product{position:relative}
.imgslot--bottle2{width:min(70vw,340px);aspect-ratio:3/4;border-radius:18px;background:
  radial-gradient(80% 70% at 50% 38%,#fff,#E4F2F5);box-shadow:var(--shadow)}
.ripple{position:absolute;left:50%;top:54%;width:60%;aspect-ratio:1;border:1px solid var(--water-soft);border-radius:50%;
  transform:translate(-50%,-50%);opacity:.6}
.benefit__steps{padding:14vh 0}
.benefit__head{margin-bottom:40px}
.bstep{padding:42px 0;border-top:1px solid var(--line)}
.bstep:first-of-type{border-top:none}
.bstep__no{display:block;font-size:30px;color:var(--water);margin-bottom:10px}
.bstep h3{font-family:'Noto Serif JP',serif;font-weight:500;font-size:clamp(20px,2.8vw,26px);color:var(--ink);margin-bottom:12px}
.bstep p{color:var(--ink-soft);font-size:15px;line-height:2}
@media(max-width:820px){
  .benefit__grid{grid-template-columns:1fr;gap:8px}
  .benefit__sticky{position:relative;height:auto;margin-bottom:20px}
  .imgslot--bottle2{width:min(64vw,280px)}
  .benefit__steps{padding:0}
}

/* ============================================================
   TEXTURE（全幅・クリップ）
   ============================================================ */
.texture{position:relative;margin:clamp(40px,6vw,80px) 0}
.imgslot--texture{aspect-ratio:21/9;background:linear-gradient(135deg,#DCEFF2,#C7E6EC)}
.texture__cap{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;text-align:center;z-index:5}
.texture__cap p{font-family:'Noto Serif JP',serif;font-weight:400;font-size:clamp(20px,3.4vw,38px);line-height:1.7;color:#fff;
  text-shadow:0 2px 30px rgba(20,60,68,.5);letter-spacing:.04em}
@media(max-width:680px){.imgslot--texture{aspect-ratio:4/5}}

/* ============================================================
   INGREDIENTS
   ============================================================ */
.ingr{padding:clamp(70px,9vw,120px) 0}
.ingr__grid{max-width:var(--maxw);margin:0 auto;padding:0 clamp(20px,5vw,40px);
  display:grid;grid-template-columns:1fr 1fr;gap:clamp(30px,6vw,80px);align-items:center}
.imgslot--ingr{aspect-ratio:4/5;border-radius:18px;box-shadow:var(--shadow)}
.ingr__tx h2{margin-bottom:30px}
.ingr__list{list-style:none;display:flex;flex-direction:column}
.ingr__list li{padding:24px 0;border-bottom:1px solid var(--line)}
.ingr__list li:first-child{border-top:1px solid var(--line)}
.ingr__list h3{font-family:'Noto Serif JP',serif;font-weight:500;font-size:18px;color:var(--ink);margin-bottom:6px;display:flex;align-items:baseline;gap:12px}
.ingr__list h3 span{font-family:'Zen Kaku Gothic New',sans-serif;font-size:11px;font-weight:500;color:var(--water-d);background:var(--bg-tint);padding:3px 10px;border-radius:20px;letter-spacing:.06em}
.ingr__list p{font-size:14px;color:var(--ink-soft);line-height:1.9}
@media(max-width:820px){.ingr__grid{grid-template-columns:1fr;gap:30px}.ingr__fig{max-width:420px;margin:0 auto}}

/* ============================================================
   VOICE / USE
   ============================================================ */
.voice{padding:clamp(70px,9vw,110px) 0;background:var(--bg-tint)}
.imgslot--use{aspect-ratio:16/7;border-radius:18px;background:linear-gradient(135deg,#E4F2F5,#D2E9ED)}
.voice__feature{margin-bottom:44px;box-shadow:var(--shadow)}
.voice__grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.vcard{background:#fff;border-radius:16px;padding:30px 26px;box-shadow:var(--shadow-sm)}
.vcard__l{display:inline-block;font-size:17px;color:var(--water-d);margin-bottom:14px}
.vcard blockquote{font-size:14px;color:var(--ink);line-height:1.95;margin-bottom:16px}
.vcard figcaption{font-size:12px;color:var(--mute)}
@media(max-width:820px){.voice__grid{grid-template-columns:1fr;gap:14px}.imgslot--use{aspect-ratio:4/3}}

/* ============================================================
   FAQ
   ============================================================ */
.faq{padding:clamp(70px,9vw,110px) 0}
.faq__list{display:flex;flex-direction:column;gap:12px}
.faq__item{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;transition:box-shadow .25s}
.faq__item[open]{box-shadow:var(--shadow-sm)}
.faq__item summary{list-style:none;cursor:pointer;padding:22px 54px 22px 26px;font-weight:500;font-size:15px;color:var(--ink);position:relative;line-height:1.6}
.faq__item summary::-webkit-details-marker{display:none}
.faq__ic{position:absolute;right:24px;top:25px;width:15px;height:15px}
.faq__ic::before,.faq__ic::after{content:"";position:absolute;background:var(--water);border-radius:2px;transition:transform .25s var(--ease)}
.faq__ic::before{left:6.5px;top:0;width:2px;height:15px}
.faq__ic::after{left:0;top:6.5px;width:15px;height:2px}
.faq__item[open] .faq__ic::before{transform:scaleY(0)}
.faq__a{padding:0 26px 24px;font-size:14px;color:var(--ink-soft);line-height:1.95}

/* ============================================================
   CTA
   ============================================================ */
.cta{position:relative;overflow:hidden;padding:clamp(80px,11vw,140px) 0;background:var(--bg-tint)}
.cta__bg{position:absolute;inset:0;z-index:0}
.cta__in{position:relative;z-index:2;max-width:980px;margin:0 auto;padding:0 clamp(20px,5vw,40px);
  display:grid;grid-template-columns:.85fr 1.15fr;gap:clamp(28px,5vw,64px);align-items:center}
.imgslot--cta{width:100%;aspect-ratio:3/4;border-radius:18px;background:radial-gradient(80% 70% at 50% 38%,#fff,#E4F2F5);box-shadow:var(--shadow)}
.cta__h{font-family:'Noto Serif JP',serif;font-weight:500;font-size:clamp(24px,3.6vw,38px);color:var(--ink);margin:6px 0 18px;line-height:1.5}
.cta__price{font-size:clamp(38px,6vw,60px);color:var(--ink);line-height:1}
.cta__price span{font-family:'Zen Kaku Gothic New',sans-serif;font-size:14px;color:var(--mute);margin-left:8px}
.cta__sub{margin-top:12px;color:var(--ink-soft);font-size:14px}
.cta__in .btn{margin-top:26px}
.cta__note{margin-top:14px;font-size:11px;color:var(--mute)}
@media(max-width:760px){.cta__in{grid-template-columns:1fr;text-align:center;gap:24px}.cta__product{max-width:240px;margin:0 auto}.cta__in .btn{margin-left:auto;margin-right:auto}}

/* ============================================================
   FOOTER
   ============================================================ */
.ft{background:var(--ink);color:#fff;text-align:center;padding:56px 24px 44px;display:flex;flex-direction:column;align-items:center;gap:8px}
.ft__brand{font-family:'Italiana',serif;font-size:34px;letter-spacing:.05em}
.ft__sub{font-size:13px;letter-spacing:.12em;color:rgba(255,255,255,.7)}
.ft__by{margin-top:14px;font-size:12px;color:rgba(255,255,255,.55)}
.ft__by a{color:var(--water-soft);border-bottom:1px solid transparent;transition:border-color .2s}
.ft__by a:hover{border-bottom-color:var(--water-soft)}

/* ============================================================
   REVEAL / CLIP / FLOAT
   ============================================================ */
@media (prefers-reduced-motion:no-preference){
  body.js-anim [data-rv]{opacity:0;transform:translateY(26px)}
  body.js-anim [data-clip] .imgslot{clip-path:inset(0 0 100% 0)}
  body.js-anim [data-clip] .imgslot img{transform:scale(1.14)}
}