:root{ --navy:#1F395E; --line:#E3E7EC; --ink:#1B2430; --muted:#5A6472; --bg:#F5F7FA; }
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Noto Sans JP",sans-serif;
  font-size:15px;line-height:1.7}
.head{display:flex;align-items:center;justify-content:space-between;gap:12px;
  background:var(--navy);color:#fff;padding:10px 18px}
.head a{color:#fff;text-decoration:none}
.brand{font-weight:700}
.head .right{display:flex;align-items:center;gap:14px;font-size:13px}
.inline{display:inline}
.link{background:none;border:0;color:#fff;font:inherit;cursor:pointer;padding:0;
  text-decoration:underline}
.wrap{max-width:900px;margin:0 auto;padding:18px}
.card{background:#fff;border:1px solid var(--line);border-radius:10px;padding:22px;
  margin-bottom:16px}
.card h1{font-size:18px;margin:0 0 12px}
.login{max-width:420px;margin:64px auto;text-align:center}
.btn{display:inline-block;background:var(--navy);color:#fff;text-decoration:none;
  border-radius:8px;padding:12px 22px;font-weight:700;min-height:44px}
.note{color:var(--muted);font-size:13px;margin-top:14px}
.err{color:#B3261E;font-size:13px}