/* ─────────────────────────────────────────────
   shiro ─ オンボーディング（入口〜デザイナー登録）
   PDFの世界観：純白・明朝・細い枠線・広い字間・余白
   ───────────────────────────────────────────── */

:root {
    --ob-ink: #1a1a1a;
    --ob-soft: #555;
    --ob-faint: #9a9a9a;
    --ob-line: #d8d5cf;
    --ob-line-strong: #9a9a9a;
    --ob-serif: "Hiragino Mincho ProN", "Yu Mincho", "Noto Serif JP", serif;
}

* { box-sizing: border-box; }

.ob-body {
    margin: 0;
    background: #ffffff;
    color: var(--ob-ink);
    font-family: var(--ob-serif);
    font-weight: 400;
    line-height: 2;
    -webkit-font-smoothing: antialiased;
    letter-spacing: .04em;
}

.ob-wrap {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 64px 24px;
    text-align: center;
}

/* ── 見出し・文字 ── */
.ob-mark {
    font-family: var(--ob-serif);
    font-size: clamp(56px, 12vw, 120px);
    letter-spacing: .18em;
    line-height: 1;
    margin: 0;
    padding-left: .18em; /* 字間の視覚中央合わせ */
    font-weight: 400;
}
.ob-h1 {
    font-size: clamp(20px, 3vw, 30px);
    letter-spacing: .4em;
    font-weight: 400;
    margin: 0 0 8px;
    padding-left: .4em;
}
.ob-h2 {
    font-size: clamp(16px, 2.4vw, 22px);
    letter-spacing: .35em;
    font-weight: 400;
    margin: 0 0 40px;
    padding-left: .35em;
}
.ob-lead { font-size: 16px; letter-spacing: .3em; color: var(--ob-ink); margin: 0 0 10px; }
.ob-q { font-size: 15px; letter-spacing: .25em; color: var(--ob-soft); margin: 0 0 28px; }
.ob-text { font-size: 14.5px; color: var(--ob-soft); line-height: 2.4; margin: 6px 0; }
.ob-text-block { margin: 40px 0 56px; }
.ob-note { font-size: 12px; color: var(--ob-faint); letter-spacing: .1em; }

/* 縦書きのタグライン（入口） */
.ob-tate {
    writing-mode: vertical-rl;
    text-orientation: upright;
    font-size: 15px;
    letter-spacing: .35em;
    color: var(--ob-ink);
    height: 260px;
    margin: 0 auto 48px;
    line-height: 1.9;
}

/* ── 枠線ボタン ── */
.ob-btn {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-width: 190px;
    padding: 20px 40px;
    border: 1px solid var(--ob-line-strong);
    background: #fff;
    color: var(--ob-ink);
    font-family: var(--ob-serif);
    font-size: 16px;
    letter-spacing: .3em;
    padding-left: calc(40px + .3em);
    cursor: pointer;
    text-decoration: none;
    transition: background .25s ease, color .25s ease, border-color .25s ease;
    line-height: 1.4;
}
.ob-btn:hover { background: var(--ob-ink); color: #fff; border-color: var(--ob-ink); }
.ob-btn .sub { display: block; font-size: 11px; letter-spacing: .3em; color: var(--ob-faint); margin-top: 6px; }
.ob-btn:hover .sub { color: rgba(255,255,255,.7); }
.ob-btn-lg { min-width: 200px; padding: 22px 44px; }

/* 選択肢2つ（入口） */
.ob-choices { display: flex; flex-direction: column; gap: 26px; align-items: center; margin-top: 8px; }

/* ── ステップ（ウィザード）── */
.ob-step { display: none; width: 100%; max-width: 720px; margin: 0 auto; animation: obFade .5s ease; }
.ob-step.active { display: block; }
@keyframes obFade { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

.ob-actions { margin-top: 56px; display: flex; gap: 18px; justify-content: center; align-items: center; }
.ob-back {
    background: none; border: none; color: var(--ob-faint); font-family: var(--ob-serif);
    font-size: 13px; letter-spacing: .2em; cursor: pointer; text-decoration: none;
}
.ob-back:hover { color: var(--ob-soft); }

/* ステップ進行ドット */
.ob-dots { display: flex; gap: 10px; justify-content: center; margin-top: 48px; }
.ob-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--ob-line); }
.ob-dot.on { background: var(--ob-ink); }

/* ── チェックリスト（約束）── */
.ob-pledge { list-style: none; padding: 0; margin: 0 auto; max-width: 420px; text-align: left; }
.ob-pledge li { margin: 22px 0; }
.ob-check { display: flex; align-items: center; gap: 16px; cursor: pointer; font-size: 15px; letter-spacing: .12em; color: var(--ob-ink); }
.ob-check input { position: absolute; opacity: 0; width: 0; height: 0; }
.ob-check .box {
    flex: 0 0 auto; width: 20px; height: 20px; border: 1px solid var(--ob-line-strong);
    display: inline-flex; align-items: center; justify-content: center; transition: all .2s;
}
.ob-check .box::after { content: ""; width: 10px; height: 10px; background: var(--ob-ink); transform: scale(0); transition: transform .2s; }
.ob-check input:checked + .box { border-color: var(--ob-ink); }
.ob-check input:checked + .box::after { transform: scale(1); }
.ob-check input:focus-visible + .box { box-shadow: 0 0 0 3px rgba(0,0,0,.08); }

/* ── ラジオ・チェック（○ 選択肢グリッド）── */
.ob-options { display: grid; grid-template-columns: 1fr 1fr; gap: 20px 48px; max-width: 560px; margin: 8px auto 0; text-align: left; }
.ob-opt { display: flex; align-items: center; gap: 14px; cursor: pointer; font-size: 15px; letter-spacing: .12em; color: var(--ob-ink); }
.ob-opt input { position: absolute; opacity: 0; width: 0; height: 0; }
.ob-opt .circle {
    flex: 0 0 auto; width: 18px; height: 18px; border: 1px solid var(--ob-line-strong); border-radius: 50%;
    display: inline-flex; align-items: center; justify-content: center; transition: all .2s;
}
.ob-opt .circle::after { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--ob-ink); transform: scale(0); transition: transform .2s; }
.ob-opt input:checked + .circle { border-color: var(--ob-ink); }
.ob-opt input:checked + .circle::after { transform: scale(1); }
.ob-opt input:focus-visible + .circle { box-shadow: 0 0 0 3px rgba(0,0,0,.08); }

/* 横並びのラジオ（AIについて等） */
.ob-inline { display: flex; gap: 40px; justify-content: center; flex-wrap: wrap; margin: 8px 0 0; }

/* ── フォーム ── */
.ob-form { max-width: 640px; margin: 0 auto; text-align: left; }
.ob-field { display: flex; align-items: flex-start; gap: 24px; margin-bottom: 26px; }
.ob-field > label { flex: 0 0 130px; text-align: right; font-size: 14px; letter-spacing: .1em; color: var(--ob-soft); padding-top: 12px; }
.ob-field .ctrl { flex: 1; }
.ob-input, .ob-textarea {
    width: 100%; border: 1px solid var(--ob-line); background: #fff; color: var(--ob-ink);
    font-family: var(--ob-serif); font-size: 15px; padding: 11px 14px; letter-spacing: .04em;
    border-radius: 0; -webkit-appearance: none;
}
.ob-input:focus, .ob-textarea:focus { outline: none; border-color: var(--ob-ink); }
.ob-textarea { min-height: 140px; resize: vertical; line-height: 1.9; }
.ob-field-label { font-size: 15px; letter-spacing: .25em; color: var(--ob-ink); text-align: center; margin: 40px 0 18px; }

/* 中央寄せの単一フィールド（Design Philosophy 等） */
.ob-single { max-width: 640px; margin: 0 auto 40px; }
.ob-single .ob-field-label { margin-top: 0; }

/* 添付ボタン */
.ob-file { display: inline-flex; align-items: center; }
.ob-file input { display: none; }
.ob-file .ob-file-btn {
    border: 1px solid var(--ob-line-strong); padding: 9px 26px; font-size: 13px; letter-spacing: .3em;
    cursor: pointer; color: var(--ob-soft); padding-left: calc(26px + .3em);
}
.ob-file .ob-file-btn:hover { background: var(--ob-ink); color: #fff; border-color: var(--ob-ink); }
.ob-file .ob-file-name { margin-left: 14px; font-size: 12px; color: var(--ob-faint); }

/* 利用規約ボックス */
.ob-terms {
    max-width: 900px; margin: 0 auto; border: 1px solid var(--ob-line); padding: 32px 36px;
    text-align: left; height: 440px; overflow-y: auto; font-size: 13px; line-height: 2; color: var(--ob-soft);
    letter-spacing: .04em;
}
.ob-terms h4 { font-size: 14px; color: var(--ob-ink); letter-spacing: .1em; margin: 22px 0 6px; font-weight: 400; }
.ob-terms h4:first-child { margin-top: 0; }
.ob-terms p { margin: 0 0 4px; }

/* エラー */
.ob-error { color: #111; font-weight: 600; font-size: 12.5px; letter-spacing: .05em; margin-top: 6px; }
.ob-alert { max-width: 640px; margin: 0 auto 28px; border: 1px solid #111; background: #f6f6f6; color: #111; padding: 12px 18px; font-size: 13px; }

/* 小さな戻る（入口へ） */
.ob-home { position: fixed; top: 28px; left: 32px; font-size: 12px; letter-spacing: .2em; color: var(--ob-faint); text-decoration: none; }
.ob-home:hover { color: var(--ob-soft); }

.ob-center { text-align: center; }
.ob-mt { margin-top: 40px; }

@media (max-width: 640px) {
    .ob-options { grid-template-columns: 1fr; gap: 16px; }
    .ob-field { flex-direction: column; gap: 8px; }
    .ob-field > label { text-align: left; flex-basis: auto; padding-top: 0; }
    .ob-inline { gap: 20px; }
}