/* ファイルパス: public/css/auth.css */
.auth-page{min-height:100vh;display:grid;grid-template-columns:minmax(0,1.12fr) minmax(400px,.88fr);background:#fff}
.auth-hero{position:relative;overflow:hidden;padding:54px clamp(28px,6vw,84px);display:flex;flex-direction:column;justify-content:space-between;background:
  radial-gradient(circle at 16% 10%,rgba(79,70,229,.17),transparent 34%),
  radial-gradient(circle at 88% 80%,rgba(37,99,235,.12),transparent 28%),
  linear-gradient(145deg,#f8f9ff 0%,#fff 65%)}
.auth-hero::after{content:"";position:absolute;width:420px;height:420px;border-radius:50%;border:1px solid rgba(79,70,229,.10);right:-170px;top:12%}
.auth-brand{position:relative;z-index:1}
.auth-brand img{width:130px}
.auth-copy{position:relative;z-index:1;max-width:720px;margin:68px 0}
.auth-kicker{display:inline-flex;align-items:center;gap:8px;color:var(--primary);font-size:12px;font-weight:850;letter-spacing:.04em}
.auth-copy h1{margin:18px 0 16px;font-size:clamp(34px,4.7vw,62px);line-height:1.1;letter-spacing:-.055em;max-width:760px}
.auth-copy p{margin:0;max-width:660px;color:#5d6677;font-size:15px;line-height:1.9}
.auth-feature-grid{position:relative;z-index:1;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.auth-feature{padding:15px;border:1px solid rgba(79,70,229,.10);border-radius:15px;background:rgba(255,255,255,.72);backdrop-filter:blur(8px)}
.auth-feature strong{display:block;font-size:13px}
.auth-feature span{display:block;margin-top:4px;color:var(--text-muted);font-size:11px;line-height:1.55}
.auth-panel{display:flex;align-items:center;justify-content:center;padding:36px;background:#fbfcfe;border-left:1px solid var(--border)}
.auth-card{width:min(460px,100%);padding:30px;border:1px solid var(--border);border-radius:24px;background:#fff;box-shadow:var(--shadow-md)}
.auth-card h2{margin:0;font-size:24px;letter-spacing:-.03em}
.auth-card>p{margin:8px 0 24px;color:var(--text-muted);line-height:1.7}
.auth-form{display:grid;gap:15px}
.auth-role-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
.role-choice{position:relative}
.role-choice input{position:absolute;opacity:0;pointer-events:none}
.role-choice span{min-height:44px;display:flex;align-items:center;justify-content:center;border:1px solid var(--border);border-radius:11px;background:#fff;color:#475467;font-size:12px;font-weight:750}
.role-choice input:checked+span{border-color:#a5b4fc;background:var(--primary-soft);color:var(--primary);box-shadow:0 0 0 2px rgba(79,70,229,.06)}
.auth-submit{width:100%;margin-top:2px}
.auth-message{min-height:20px;font-size:12px;line-height:1.5}
.auth-foot{margin-top:22px;padding-top:18px;border-top:1px solid var(--border);color:var(--text-muted);font-size:11px;line-height:1.65}
@media(max-width:980px){.auth-page{grid-template-columns:1fr}.auth-hero{min-height:360px;padding:32px 24px}.auth-copy{margin:38px 0}.auth-feature-grid{grid-template-columns:1fr}.auth-panel{border-left:0;border-top:1px solid var(--border);padding:28px 18px}}
@media(max-width:560px){.auth-hero{display:none}.auth-panel{min-height:100vh;padding:18px}.auth-card{padding:22px;border-radius:18px}.auth-role-grid{grid-template-columns:1fr 1fr}}