:root{--bg:#fff5f9;--ink:#3a1f3d;--soft:#7a5c7d;--pink:#f58fb5;--pink-d:#c93f7b;--sky:#bfe6ff;--card:#fff;--line:#f0cfe0}
@media (prefers-color-scheme:dark){:root{--bg:#1e1024;--ink:#fbe9f3;--soft:#c4a6c9;--pink:#f58fb5;--pink-d:#ff86b4;--sky:#2b3f66;--card:#2a1732;--line:#4b2a58}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.65 "Zen Maru Gothic","Hiragino Maru Gothic ProN","Segoe UI",sans-serif}
a{color:var(--pink-d)}
:focus-visible{outline:3px solid var(--pink-d);outline-offset:3px}
header,main,footer{max-width:760px;margin:0 auto;padding:0 20px}
nav{display:flex;justify-content:space-between;align-items:center;padding:22px 0;font-weight:700}
nav .logo{font-size:1.25rem;text-decoration:none;color:var(--ink)}
nav a.btn{padding:8px 18px}
.btn{display:inline-block;background:var(--pink);color:#3a1f3d;border:0;border-radius:999px;padding:12px 26px;text-decoration:none;cursor:pointer;font:inherit;font-weight:700}
.btn:hover{background:var(--pink-d);color:#fff}
.hero{padding:36px 0 28px}
.hero h1{font-size:clamp(2.2rem,7vw,3.6rem);line-height:1.1;margin:0 0 14px;letter-spacing:-.02em}
.hero p{color:var(--soft);max-width:34em;margin:0 0 22px}
.chat{display:flex;flex-direction:column;gap:10px;margin:26px 0 8px}
.bubble{max-width:82%;padding:12px 18px;border-radius:22px;background:var(--card);border:2px solid var(--line)}
.bubble.me{align-self:flex-end;background:var(--sky);border-color:transparent;border-bottom-right-radius:6px}
.bubble.her{border-bottom-left-radius:6px}
.bubble small{display:block;color:var(--soft);font-size:.8rem}
h2{font-size:1.4rem;margin:44px 0 10px}
ul.plain{padding-left:1.2em}
ul.plain li{margin:6px 0}
form{background:var(--card);border:2px solid var(--line);border-radius:22px;padding:26px;margin:20px 0}
label{display:block;font-weight:700;margin:14px 0 6px}
input[type=text],input[type=password]{width:100%;padding:12px 14px;font:inherit;color:var(--ink);background:var(--bg);border:2px solid var(--line);border-radius:14px}
.at{display:flex;align-items:center;gap:8px}
.at span{white-space:nowrap;color:var(--soft)}
.check{display:flex;gap:10px;align-items:flex-start;font-weight:400;margin:18px 0}
.check input{margin-top:6px}
.err{background:#ffe1ea;color:#7a1237;border-radius:14px;padding:12px 16px;margin:16px 0;font-weight:700}
.ok{background:var(--sky);border-radius:22px;padding:24px;margin:20px 0}
.hint{color:var(--soft);font-size:.9rem;margin:6px 0 0}
footer{padding:44px 20px 40px;color:var(--soft);font-size:.9rem}
.logo{display:flex;align-items:center;gap:10px}
.logo-img{height:44px;width:auto}
.top-logo{text-align:center;padding:28px 0 0}
.top-logo img{height:120px;width:auto;max-width:100%}