:root{
  --ground:#f3f6f5; --surface:#ffffff; --ink:#18282b; --muted:#56696c; --line:#d6e0de;
  --accent:#0d6b66; --on-accent:#ffffff; --crit:#a8281f; --crit-bg:#fbe7e4; --ok:#1b6e45; --ok-bg:#e1f2e8;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){
  :root{ --ground:#101a1b; --surface:#172426; --ink:#e3ecea; --muted:#9db0ae; --line:#2a3c3e;
    --accent:#4fbdb4; --on-accent:#08201f; --crit:#f2958b; --crit-bg:#3a1c19; --ok:#7fd3a6; --ok-bg:#15301f; color-scheme:dark; }
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html,body{height:100%;margin:0}
body{background:var(--ground);color:var(--ink);font:15px/1.5 "Public Sans",system-ui,-apple-system,"Segoe UI",sans-serif}
.center{min-height:100%;display:grid;place-items:center;padding:24px 16px}
.card{width:100%;max-width:400px;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:28px 24px;display:flex;flex-direction:column;gap:14px}
h1{font-size:22px;margin:0;letter-spacing:-.01em}
p{margin:0}
.muted{color:var(--muted);font-size:14px}
.btn{font:600 15px inherit;font-family:inherit;border:1px solid var(--line);background:var(--surface);color:var(--ink);padding:11px 16px;border-radius:9px;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:10px}
.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--on-accent)}
.btn:disabled{opacity:.5;cursor:default}
.btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.msg{font-size:14px;border-radius:8px;padding:8px 12px}
.msg.err{background:var(--crit-bg);color:var(--crit)}
.msg.ok{background:var(--ok-bg);color:var(--ok)}
#guide{position:fixed;inset:0;width:100%;height:100%;border:0;background:var(--ground)}
#signout{position:fixed;left:10px;bottom:10px;z-index:5;font-size:12px;padding:5px 10px;opacity:.75}
#signout:hover{opacity:1}
input[type=file]{font:inherit;color:var(--ink)}
dl{display:grid;grid-template-columns:auto 1fr;gap:4px 12px;margin:0;font-size:14px}
dt{color:var(--muted)} dd{margin:0}
.field{display:flex;flex-direction:column;gap:5px;font-size:14px;font-weight:600}
.field input{font:400 15px/1.4 inherit;font-family:inherit;color:var(--ink);background:var(--ground);border:1px solid var(--line);border-radius:9px;padding:10px 12px;width:100%}
.field input:focus{outline:2px solid var(--accent);outline-offset:1px;border-color:var(--accent)}
.links{display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px 16px;font-size:14px}
a{color:var(--accent)}
.ms{width:18px;height:18px;flex:none}
.help{border-top:1px solid var(--line);padding-top:14px;font-size:14px;display:flex;flex-direction:column;gap:8px;color:var(--ink)}
.help ol,.help ul{margin:0;padding-left:20px;display:flex;flex-direction:column;gap:4px}
.help details{color:var(--muted)}
.help summary{cursor:pointer;font-weight:600;color:var(--accent)}
.help details ul{margin-top:8px}
.logo-h{display:flex;align-items:center;gap:10px}
.logo-h img{display:block;max-width:100%;height:auto}
.logo-h picture{display:block}
.logo-h span,.brand-sub{font-size:18px;font-weight:600;color:var(--muted);letter-spacing:.02em}
.brand picture img{display:block}
.sp-bar{position:fixed;left:50%;bottom:16px;transform:translateX(-50%);z-index:50;background:var(--surface);color:var(--ink);border:1px solid var(--line);border-left:4px solid var(--accent);border-radius:12px;box-shadow:0 10px 30px rgba(0,0,0,.25);padding:12px 14px;display:flex;gap:10px;align-items:center;flex-wrap:wrap;max-width:min(640px,calc(100vw - 24px));font-size:14px}
.sp-bar span{flex:1 1 220px}