/* ============================================================
   若観門豆 - common stylesheet
   palette: 藍/紺(水・にがり) × 生成り(豆腐) × 米色(大豆)
   ============================================================ */
:root{
  --ai:#16324f;        /* 深い藍 */
  --ai-deep:#0e2236;   /* 紺(最暗部) */
  --ai-mid:#27557e;    /* 中間の藍 */
  --ai-soft:#5b86ad;   /* 淡い藍 */
  --kinari:#f7f4ec;    /* 生成り(豆腐の白) */
  --kinari-d:#ece6d8;  /* 生成り陰 */
  --kome:#d9c9a3;      /* 米色(大豆) */
  --kome-d:#bda270;    /* 大豆の陰 */
  --sumi:#1c1c1a;      /* 墨 */
  --line:rgba(22,50,79,.14);
  --shadow:0 12px 40px -18px rgba(14,34,54,.45);
  --mincho:"Shippori Mincho","Hiragino Mincho ProN","Yu Mincho",serif;
  --gothic:"Zen Kaku Gothic New","Hiragino Sans","Yu Gothic",sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--gothic);
  color:var(--sumi);
  background:var(--kinari);
  line-height:1.9;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
  letter-spacing:.02em;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.mincho{font-family:var(--mincho)}
.wrap{width:min(1140px,90vw);margin-inline:auto}
.eyebrow{
  font-family:var(--gothic);font-size:.72rem;letter-spacing:.42em;
  text-transform:uppercase;color:var(--ai-soft);font-weight:700;
  display:inline-block;
}
.sec-title{
  font-family:var(--mincho);font-weight:600;
  font-size:clamp(1.7rem,4.4vw,2.7rem);line-height:1.35;
  color:var(--ai);letter-spacing:.04em;
}

/* ---------- header ---------- */
.site-head{
  position:fixed;top:0;left:0;right:0;z-index:60;
  display:flex;align-items:center;justify-content:space-between;
  padding:18px clamp(20px,5vw,56px);
  transition:background .4s ease,box-shadow .4s ease,padding .4s ease;
}
.site-head.scrolled{
  background:rgba(247,244,236,.86);backdrop-filter:blur(12px);
  box-shadow:0 1px 0 var(--line);padding-top:12px;padding-bottom:12px;
}
.brand{display:flex;align-items:center;gap:13px}
.brand .mark{width:44px;height:44px;flex:none;border-radius:9px;box-shadow:0 2px 8px rgba(14,34,54,.18)}
.brand .name{font-family:var(--mincho);font-weight:600;font-size:1.28rem;
  color:var(--ai);letter-spacing:.14em;line-height:1}
.brand .name small{display:block;font-family:var(--gothic);font-size:.56rem;
  letter-spacing:.36em;color:var(--ai-soft);font-weight:700;margin-top:5px}
.nav{display:flex;align-items:center;gap:clamp(18px,2.6vw,40px)}
.nav a{font-size:.86rem;letter-spacing:.16em;color:var(--ai);font-weight:500;
  position:relative;padding:4px 0}
.nav a .en{display:block;font-size:.58rem;letter-spacing:.24em;color:var(--ai-soft);
  text-align:center;margin-top:2px;font-weight:700}
.nav a::after{content:"";position:absolute;left:0;right:100%;bottom:-3px;height:1.5px;
  background:var(--ai);transition:right .35s ease}
.nav a:hover::after,.nav a.active::after{right:0}
.nav .tel{display:flex;align-items:center;gap:8px;background:var(--ai);color:var(--kinari);
  padding:11px 20px;border-radius:999px;font-size:.82rem;letter-spacing:.08em;font-weight:600}
.nav .tel:hover{background:var(--ai-deep)}
.nav .tel::after{display:none}
.burger{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px}
.burger span{width:26px;height:2px;background:var(--ai);transition:.3s}

@media(max-width:880px){
  /* モバイルでは backdrop-filter を使わない。
     これが子要素 .nav の position:fixed の基準を
     ヘッダーに縮めてしまう(iOS等)ため、メニュー崩れの根本原因。
     見た目はほぼ不透明背景で代替する。 */
  .site-head.scrolled{background:rgba(247,244,236,.96);backdrop-filter:none;-webkit-backdrop-filter:none}

  .nav{position:fixed;top:0;left:0;width:100vw;height:100vh;height:100dvh;background:var(--ai-deep);flex-direction:column;
    justify-content:center;gap:30px;transform:translateX(100%);transition:transform .45s ease;z-index:55}
  .nav.open{transform:none}
  .nav a{color:var(--kinari);font-size:1.2rem}
  .nav a .en{color:var(--ai-soft)}
  .nav a::after{background:var(--kinari)}
  .nav .tel{background:var(--kome);color:var(--ai-deep)}
  .burger{display:flex;z-index:60}
  .burger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .burger.open span:nth-child(2){opacity:0}
  .burger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  .site-head.menu-open .burger span{background:var(--kinari)}
}

/* ---------- footer ---------- */
.site-foot{background:var(--ai-deep);color:var(--kinari);padding:72px 0 32px;margin-top:120px}
.site-foot .grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:48px}
.site-foot .name{font-family:var(--mincho);font-size:1.5rem;letter-spacing:.16em;margin-bottom:14px}
.site-foot p{font-size:.86rem;color:rgba(247,244,236,.74);line-height:2}
.site-foot h4{font-size:.7rem;letter-spacing:.3em;color:var(--ai-soft);margin-bottom:16px;font-weight:700}
.site-foot ul{list-style:none}
.site-foot ul li{margin-bottom:10px;font-size:.88rem}
.site-foot ul a:hover{color:var(--kome)}
.site-foot .copy{margin-top:56px;padding-top:24px;border-top:1px solid rgba(247,244,236,.14);
  font-size:.72rem;letter-spacing:.1em;color:rgba(247,244,236,.5);text-align:center}
@media(max-width:760px){.site-foot .grid{grid-template-columns:1fr;gap:36px}}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:12px;font-size:.86rem;letter-spacing:.1em;
  font-weight:600;padding:15px 30px;border-radius:999px;transition:.3s;cursor:pointer;border:0}
.btn-fill{background:var(--ai);color:var(--kinari)}
.btn-fill:hover{background:var(--ai-deep);gap:18px}
.btn-line{border:1.5px solid var(--ai);color:var(--ai);background:transparent}
.btn-line:hover{background:var(--ai);color:var(--kinari)}
.btn .arr{transition:transform .3s}
.btn:hover .arr{transform:translateX(4px)}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .9s ease,transform .9s ease}
.reveal.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  *{scroll-behavior:auto!important}
}

/* ============================================================
   LOADER  -  大豆 → 豆腐
   ============================================================ */
#loader{position:fixed;inset:0;z-index:9999;background:var(--ai-deep);
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  transition:opacity .8s ease,visibility .8s ease}
#loader.done{opacity:0;visibility:hidden}
.load-stage{position:relative;width:200px;height:200px}
/* 水面 */
.water{position:absolute;left:50%;bottom:0;transform:translateX(-50%);
  width:160px;height:108px;border-radius:0 0 14px 14px;
  background:linear-gradient(180deg,rgba(91,134,173,.35),rgba(39,85,126,.6));
  overflow:hidden;opacity:0;animation:waterIn .6s ease .2s forwards}
.water::before{content:"";position:absolute;top:-6px;left:-20%;width:140%;height:14px;
  background:radial-gradient(circle,rgba(247,244,236,.5) 1px,transparent 1.4px) 0 0/16px 14px;
  animation:ripple 2.4s linear infinite}
@keyframes ripple{to{transform:translateX(16px)}}
@keyframes waterIn{to{opacity:1}}
/* 大豆たち */
.bean{position:absolute;width:24px;height:21px;border-radius:50% 50% 48% 48%;
  background:radial-gradient(circle at 35% 30%,var(--kome),var(--kome-d));
  box-shadow:inset -2px -3px 4px rgba(0,0,0,.18)}
.bean::after{content:"";position:absolute;left:50%;top:62%;width:9px;height:2px;
  background:var(--ai-deep);opacity:.35;border-radius:2px;transform:translateX(-50%)}
.b1{left:74px;animation:drop1 1.5s cubic-bezier(.4,1.4,.5,1) .5s forwards;top:-30px;opacity:0}
.b2{left:96px;animation:drop2 1.5s cubic-bezier(.4,1.4,.5,1) .8s forwards;top:-30px;opacity:0}
.b3{left:118px;animation:drop3 1.5s cubic-bezier(.4,1.4,.5,1) 1.1s forwards;top:-30px;opacity:0}
@keyframes drop1{0%{opacity:0;top:-30px}20%{opacity:1}70%{top:120px}100%{top:118px;left:62px;opacity:1}}
@keyframes drop2{0%{opacity:0;top:-30px}20%{opacity:1}70%{top:120px}100%{top:130px;left:90px;opacity:1}}
@keyframes drop3{0%{opacity:0;top:-30px}20%{opacity:1}70%{top:120px}100%{top:122px;left:116px;opacity:1}}
/* 豆腐ブロック(凝固) */
.tofu{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%) scale(.4);
  width:128px;height:128px;border-radius:16px;
  background:linear-gradient(150deg,#fff,var(--kinari) 55%,var(--kinari-d));
  box-shadow:0 18px 40px -12px rgba(0,0,0,.5),inset 0 2px 0 rgba(255,255,255,.8),
    inset 0 -10px 24px rgba(189,162,112,.18);
  opacity:0;animation:congeal .9s cubic-bezier(.2,.8,.3,1) 2.5s forwards}
@keyframes congeal{0%{opacity:0;transform:translate(-50%,-50%) scale(.4)}
  60%{opacity:1;transform:translate(-50%,-50%) scale(1.06)}
  100%{opacity:1;transform:translate(-50%,-50%) scale(1)}}
/* 包丁の切れ目 */
.cut{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  width:128px;height:128px;opacity:0;animation:cutIn .5s ease 3.4s forwards}
.cut::before,.cut::after{content:"";position:absolute;background:rgba(22,50,79,.16)}
.cut::before{left:50%;top:0;width:1.5px;height:100%}
.cut::after{top:50%;left:0;height:1.5px;width:100%}
@keyframes cutIn{to{opacity:1}}
.load-txt{margin-top:46px;text-align:center;color:var(--kinari)}
.load-txt .jp{font-family:var(--mincho);font-size:1.5rem;letter-spacing:.5em;
  padding-left:.5em;animation:fadeUp .8s ease .4s both}
.load-txt .kana{font-family:var(--mincho);font-size:.78rem;letter-spacing:.42em;
  padding-left:.42em;color:rgba(247,244,236,.78);margin-top:10px;animation:fadeUp .8s ease .65s both}
.load-txt .en{font-size:.62rem;letter-spacing:.45em;color:var(--ai-soft);
  margin-top:10px;font-weight:700;animation:fadeUp .8s ease .9s both}
.load-bar{width:120px;height:2px;background:rgba(247,244,236,.18);margin:26px auto 0;
  border-radius:2px;overflow:hidden}
.load-bar i{display:block;height:100%;width:0;background:var(--kome);
  animation:fill 4.2s ease forwards}
@keyframes fill{to{width:100%}}
@keyframes fadeUp{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
@media(prefers-reduced-motion:reduce){
  .bean,.tofu,.cut,.water{animation-duration:.01s!important}
  .load-bar i{animation-duration:1.2s!important}
}