/* サーバーのページ（パスワードの再登録など）。ホームページ nakanix.com と同じ配色 */
:root {
    --paper: #eef0e2; --paper2: #e1e5cf; --card: #f7f8ef; --ink: #1d3530; --ink-soft: #52675e;
    --rule: #c2c9ad; --tape: #f2b62b; --tape-ink: #2a2208; --link: #1f6a8f;
    --ok-bg: #e3f0df; --ok-border: #6fa863; --err-bg: #f8e3e8; --err-border: #d9406f; --input: #ffffff;
    color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
    :root {
        --paper: #131f1c; --paper2: #1a2925; --card: #1d2d29; --ink: #e6eadb; --ink-soft: #a7b5ab;
        --rule: #34463f; --link: #7cc3e6;
        --ok-bg: #1d3324; --ok-border: #5b9a5f; --err-bg: #3a1f28; --err-border: #e0668c; --input: #14211e;
    }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
    margin: 0; background: var(--paper); color: var(--ink);
    font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", Meiryo, sans-serif;
    font-size: 16px; line-height: 1.8; overflow-wrap: anywhere;
}
a { color: var(--link); text-underline-offset: 3px; }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 16px; }

.site-header { border-bottom: 1px solid var(--rule); background: var(--paper2); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 56px; flex-wrap: wrap; }
.brand { font-weight: 800; letter-spacing: .08em; color: var(--ink); text-decoration: none; font-size: 18px; }
.brand small { font-weight: 600; letter-spacing: .02em; color: var(--ink-soft); margin-left: 6px; font-size: 13px; }
.nav { display: flex; gap: 16px; font-size: 14px; flex-wrap: wrap; }
.nav a { color: var(--ink-soft); text-decoration: none; }
.nav a:hover { color: var(--ink); text-decoration: underline; }

main.wrap { padding-top: 28px; padding-bottom: 48px; min-height: 60vh; }
h1 { font-size: clamp(24px, 6vw, 32px); line-height: 1.35; margin: 4px 0 12px; }
h2 { font-size: 20px; line-height: 1.4; margin: 0 0 10px; }
p { margin: 0 0 12px; }
.lead { font-size: 17px; color: var(--ink-soft); }
.muted { color: var(--ink-soft); font-size: 14px; }

.hero { padding: 16px 0 8px; }
.hero h1 { font-size: clamp(30px, 8vw, 40px); letter-spacing: .1em; margin: 0; }

.card, .form { background: var(--card); border: 1px solid var(--rule); border-radius: 12px; padding: 20px; margin: 0 0 16px; }
.card > :last-child { margin-bottom: 0; }

.links { display: flex; gap: 10px; flex-wrap: wrap; margin: 8px 0 24px; }
.button {
    display: inline-block; border: 0; border-radius: 999px; padding: 12px 24px;
    background: var(--ink); color: var(--paper); font: inherit; font-size: 16px; font-weight: 700;
    text-decoration: none; cursor: pointer; -webkit-appearance: none; appearance: none;
}
.button:hover { opacity: .88; }
.button:focus-visible { outline: 3px solid var(--tape); outline-offset: 2px; }
.button.secondary { background: transparent; color: var(--ink); border: 1.5px solid var(--ink); }
.form .button { width: 100%; margin-top: 4px; }

.field { margin-bottom: 18px; }
.field label { display: block; font-weight: 700; margin-bottom: 6px; font-size: 15px; }
.field input {
    width: 100%; padding: 12px 14px; font: inherit; font-size: 16px; /* 16px 未満だと iPhone で拡大される */
    border-radius: 10px; border: 1.5px solid var(--rule); background: var(--input); color: var(--ink);
}
.field input:focus { outline: none; border-color: var(--ink); box-shadow: 0 0 0 3px color-mix(in srgb, var(--tape) 45%, transparent); }

.notice { border-radius: 12px; padding: 14px 18px; margin: 0 0 16px; border: 1.5px solid; }
.notice p:last-child { margin-bottom: 0; }
.notice.success { background: var(--ok-bg); border-color: var(--ok-border); }
.notice.error { background: var(--err-bg); border-color: var(--err-border); }
.notice ul { margin: 0; padding-left: 1.2em; }

dt { font-weight: 700; margin-top: 12px; }
dd { margin: 0 0 8px; }

.site-footer { border-top: 1px solid var(--rule); color: var(--ink-soft); font-size: 13px; padding: 18px 0 28px; }
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 8px 16px; justify-content: space-between; }
.site-footer a { color: var(--ink-soft); }