:root{
    --bg: #0b1020;
    --bg-soft: #0f152b;
    --card: #121a36;
    --text: #e7eaf6;
    --muted:#a8b0c8;
    --primary:#6ea8fe;
    --primary-strong:#3d82ff;
    --danger:#ff5c7a;
    --success:#5cd1a6;
    --border: rgba(255,255,255,.08);
    --shadow: 0 10px 30px rgba(0,0,0,.35), 0 2px 10px rgba(0,0,0,.25);
}
@media (prefers-color-scheme: light){
    :root{
        --bg: #f6f7fb;
        --bg-soft: #eceff7;
        --card: #ffffff;
        --text: #0e1325;
        --muted:#5a6278;
        --primary:#3d82ff;
        --primary-strong:#1f6bff;
        --danger:#d7263d;
        --success:#1ea97c;
        --border: rgba(0,0,0,.08);
        --shadow: 0 12px 30px rgba(0,0,0,.08), 0 2px 10px rgba(0,0,0,.06);
    }
}

*{box-sizing:border-box}
/*html,body{height:100%}*/
html, body { min-height: 100dvh; }
body{
    margin:0;
    color:var(--text);
    font: 16px/1.6 system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic UI", "Yu Gothic", Meiryo, sans-serif;
    background:
        radial-gradient(1200px 800px at 10% 10%, rgba(109,85,255,.25), transparent 70%),
        radial-gradient(900px 700px at 90% 20%, rgba(62,188,255,.22), transparent 70%),
        linear-gradient(180deg, var(--bg-soft), var(--bg));
    display:grid;
    place-items:center;
    padding:24px;
}

.container{
    width:100%;
    max-width: 880px;
    display:grid;
    grid-template-columns: 1.1fr 1fr;
    gap:0;
    border:1px solid var(--border);
    border-radius:20px;
    background:var(--card);
    box-shadow:var(--shadow);
    overflow:hidden;
}
@media (max-width: 880px){
    .container{grid-template-columns: 1fr}
    .panel{display:none}
}

/* 左パネル（ブランディング） */
.panel{
    position:relative;
    padding:48px;
    background:
        radial-gradient(600px 400px at 20% 10%, rgba(255,255,255,.06), transparent 60%),
        linear-gradient(180deg, rgba(255,255,255,.03), transparent 50%);
    border-right: 1px solid var(--border);
}
.logo{display:flex; align-items:center; gap:12px; font-weight:700; letter-spacing:.2px;}
.logo-dot{
    width:12px; height:12px; border-radius:50%;
    background:conic-gradient(from 0deg, var(--primary), #8e66ff, #4bd1ff, var(--primary));
    box-shadow:0 0 16px rgba(77,142,255,.6), 0 0 32px rgba(77,142,255,.35) inset;
}
.headline{margin:48px 0 10px; font-size:28px; line-height:1.25}
.sub{margin:0; color:var(--muted)}

.feature-list{margin:28px 0 0; padding:0; list-style:none; color:var(--muted)}
.feature-list li{display:flex; gap:10px; margin:10px 0}
.feature-list svg{flex:0 0 18px}

/* 右：フォーム */
.form-wrap{padding:36px 36px 42px}
.title{margin:6px 0 16px; font-size:22px; font-weight:700}
.desc{margin:0 0 24px; color:var(--muted); font-size:14px}

.alert{
    border:1px solid var(--border);
    border-left:4px solid;
    padding:10px 12px;
    border-radius:10px;
    font-size:14px;
    margin:0 0 14px;
    background: rgba(255,255,255,.03);
}
.alert.error{ border-left-color: var(--danger) }
.alert.success{ border-left-color: var(--success) }

.field{display:flex; flex-direction:column; gap:8px; margin:14px 0}
.label{font-size:13px; color:var(--muted)}
.input{
    width:100%; padding:12px 14px; border-radius:12px;
    border:1px solid var(--border);
    background: transparent; color:var(--text);
    outline: none; transition:.18s border, .18s box-shadow, .18s transform;
}
.input:focus{ border-color: rgba(109,149,255,.6); box-shadow:0 0 0 4px rgba(77,142,255,.18) }

.password-wrap
{
    position:relative
}

.password-wrap .input
{
    padding-right: 48px;
}
.password-wrap .btn-eye
{
    position: absolute;
    right: 8px;
    top: 0;
    bottom: 0;
    margin: auto;
    width: 32px;
    height: 32px;
    display: grid;
    place-items: center;
    line-height: 0;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--muted);
    cursor: pointer;
    box-sizing: border-box;
    appearance: none;
}
.password-wrap .btn-eye *
{
    pointer-events: none;
}
.btn-eye:hover
{
    filter:brightness(1.1)
}
.btn-eye .icon-eye-off
{
    display: none;
}
.btn-eye[aria-pressed="true"] .icon-eye-open
{
    display: none;
}
.btn-eye[aria-pressed="true"] .icon-eye-off
{
    display: inline;
}

.row{display:flex; align-items:center; justify-content:space-between; gap:10px; margin-top:8px}
.checkbox{display:flex; align-items:center; gap:8px; font-size:13px; color:var(--muted)}
.checkbox input{width:16px; height:16px}

.btn{
    display:inline-flex; align-items:center; justify-content:center;
    padding:12px 16px; border-radius:12px; border:1px solid transparent;
    font-weight:700; letter-spacing:.2px; cursor:pointer;
    transition:.18s transform, .18s box-shadow, .18s background;
    user-select:none; text-decoration:none;
}
.btn:active{ transform: translateY(1px) }

.btn-primary{
    color:#fff; background:linear-gradient(180deg, var(--primary), var(--primary-strong));
    box-shadow: 0 8px 18px rgba(77,142,255,.28);
}
.btn-primary:hover{ filter:brightness(1.05) }
.btn-ghost{ color:var(--primary); background:transparent; border-color:var(--border) }
.btn-full{ width:100% }
.link{ color:var(--primary); text-decoration:none; font-weight:600 }
.link:hover{ text-decoration:underline }

.btn-row{margin-top:18px; display:flex; gap:12px}
.divider{
    display:flex; align-items:center; gap:12px; margin:20px 0;
    color:var(--muted); font-size:13px;
}
.divider:before, .divider:after{
    content:""; height:1px; background:var(--border); flex:1
}

.footer-note{ margin-top:18px; font-size:12px; color:var(--muted) }
.sr-only{position:absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden; clip:rect(0,0,0,0); border:0}

@media (max-width: 480px){
    :root{
        --safe-top: env(safe-area-inset-top, 0px);
        --safe-top-legacy: constant(safe-area-inset-top, 0px);
    }

    /* フォームコンテナの上に “十分大きい” 余白を必ず確保 */
    .form-wrap{
        padding-top: calc(
            /* 通常の余白 */ 20px
            /* セーフエリア（大きい方を採用） */ + max(var(--safe-top), var(--safe-top-legacy))
        ) !important;
        padding-left: 16px;
        padding-right: 16px;
    }

    /* 見出しの上マージンを抑えてダブりを防ぐ */
    .title{ margin-top: 4px !important; }
}