/* ── VARIABLES ── */
:root{
  --blue:#1e7fff;
  --blue2:#4da8ff;
  --pale:#e8f4ff;
  --navy:#0d2340;
  --text:#1a2840;
  --gray:#6b7280;
  --border:#dce8f8;
  --white:#fff;
  --grad:linear-gradient(135deg,#1e7fff 0%,#4da8ff 100%);
  --shadow:0 20px 60px rgba(30,127,255,.10);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:'Noto Sans JP',sans-serif;
  color:var(--text);background:#dfe7f0;
  overflow-x:hidden;line-height:1.85;
}

/* ── PC背景：550pxカラムの左右余白に背景画像 ── */
body::before,body::after{
  content:'';position:fixed;top:0;bottom:0;
  width:calc((100% - 550px) / 2);
  background-image:url('../images/26492553_m.jpg');
  background-size:cover;background-repeat:no-repeat;
  z-index:0;pointer-events:none;
}
body::before{left:0;background-position:left center}
body::after{right:0;background-position:right center}

/* ── APP FRAME ── */
.app{
  max-width:550px;margin:0 auto;min-height:100vh;
  background:var(--white);position:relative;z-index:1;
  box-shadow:0 0 60px rgba(13,35,64,.12);
}

/* ── HEADER ── */
header{
  position:fixed;top:0;left:50%;transform:translateX(-50%);
  width:100%;max-width:550px;z-index:100;
  background:rgba(255,255,255,.92);backdrop-filter:blur(16px);
  border-bottom:1px solid rgba(30,127,255,.10);
  display:flex;align-items:center;justify-content:space-between;
  padding:8px 4%;gap:12px;
}
.logo{display:flex;align-items:center;text-decoration:none;flex-shrink:1;min-width:0}
.logo-img{height:50px;width:auto;display:block}
.h-back{
  background:var(--grad);color:#fff;
  padding:10px 18px;border-radius:50px;
  font-weight:700;text-decoration:none;white-space:nowrap;flex-shrink:0;
  box-shadow:0 4px 16px rgba(30,127,255,.3);
  transition:filter .2s,transform .2s;font-size:.9rem;
}
.h-back:hover{filter:brightness(1.1);transform:translateY(-1px)}

/* ── DOC ── */
.doc{padding:96px 7% 56px}
.doc-head{
  text-align:center;margin-bottom:44px;
  padding-bottom:28px;border-bottom:1px solid var(--border);
}
.doc-eyebrow{
  display:inline-block;background:var(--pale);color:var(--blue);
  font-family:'Outfit',sans-serif;font-weight:700;
  padding:5px 16px;border-radius:100px;letter-spacing:.12em;
  font-size:.78rem;margin-bottom:16px;
}
.doc-title{
  font-weight:700;color:var(--navy);
  font-size:1.7rem;line-height:1.3;letter-spacing:-.01em;
}
.doc-lead{color:var(--text);margin-top:18px;font-size:.96rem;text-align:left}
.doc-sec{margin-bottom:34px}
.doc-sec h2{
  display:flex;align-items:center;gap:10px;
  font-size:1.18rem;color:var(--navy);font-weight:700;
  line-height:1.4;margin-bottom:14px;
}
.doc-sec h2 .no{
  font-family:'Outfit',sans-serif;font-style:italic;font-weight:900;
  background:var(--grad);-webkit-background-clip:text;-webkit-text-fill-color:transparent;
  background-clip:text;font-size:1.2rem;flex-shrink:0;
}
.doc-sec p{color:var(--text);font-size:.96rem;margin-bottom:12px}
.doc-sec ul{list-style:none;margin:0 0 12px}
.doc-sec li{
  position:relative;padding-left:20px;color:var(--text);
  font-size:.96rem;margin-bottom:8px;
}
.doc-sec li::before{
  content:'';position:absolute;left:4px;top:.7em;
  width:7px;height:7px;border-radius:50%;background:var(--blue2);
}
.doc-sec a{color:var(--blue);text-decoration:none;font-weight:500;word-break:break-all}
.doc-sec a:hover{text-decoration:underline}
.doc-date{margin-top:36px;color:var(--gray);font-size:.9rem;text-align:right}

/* ── FOOTER ── */
footer{background:#fff;padding:40px 5% 44px;color:var(--text);text-align:center;border-top:1px solid var(--border)}
.foot-in{
  display:flex;flex-direction:column;align-items:center;gap:12px;
  padding-bottom:24px;margin-bottom:18px;border-bottom:1px solid rgba(13,35,64,.10);
}
.foot-logo{width:220px;max-width:100%;height:auto;display:block}
.foot-mail a{color:var(--blue);text-decoration:none;font-weight:500;transition:opacity .2s}
.foot-mail a:hover{opacity:.75}
.foot-links{display:flex;justify-content:center;align-items:center;flex-wrap:wrap;gap:10px 0;margin-bottom:16px}
.foot-links a{color:var(--gray);text-decoration:none;font-weight:500;padding:0 18px;transition:color .2s}
.foot-links a + a{border-left:1px solid rgba(13,35,64,.15)}
.foot-links a:hover{color:var(--blue)}
.foot-links a[aria-current="page"]{color:var(--navy);font-weight:700}
.foot-copy{color:rgba(13,35,64,.4);font-size:.85rem}

@media(min-width:551px){
  header{padding-left:2%}
}