:root{
  --bg:#f6f3ef; --panel:#fff; --ink:#2d2926; --sub:#746d66;
  --accent:#7b5d4f; --accent2:#b79679; --line:#e5ddd5; --ok:#317a58; --danger:#a94848;
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP",sans-serif;line-height:1.65}
.topbar{background:#fff;border-bottom:1px solid var(--line);padding:18px max(20px,calc((100% - 1040px)/2));display:flex;justify-content:space-between;align-items:center;gap:20px;position:sticky;top:0;z-index:5}
.brand{font-family:Georgia,"Times New Roman",serif;letter-spacing:.08em;font-size:21px;font-weight:700}
.subtitle{font-size:13px;color:var(--sub)}
.userbox{text-align:right;font-size:14px}
.userbox a{color:var(--accent)}
.container{max-width:1040px;margin:0 auto;padding:28px 18px 60px}
h1{font-size:28px;margin:0 0 20px} h2{font-size:21px;margin:0 0 14px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:22px;margin-bottom:18px;box-shadow:0 3px 15px rgba(0,0,0,.03)}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.grid2{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.stat{font-size:34px;font-weight:700}.muted{color:var(--sub)}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:10px 18px;border-radius:11px;border:0;background:var(--accent);color:#fff;text-decoration:none;font-weight:700;cursor:pointer;font-size:16px}
.btn.secondary{background:#fff;color:var(--accent);border:1px solid var(--accent)}
.btn.danger{background:var(--danger)}
.btn.small{min-height:38px;font-size:14px;padding:7px 13px}
.actions{display:flex;gap:10px;flex-wrap:wrap}
label{font-weight:700;display:block;margin:14px 0 6px}
input,select{width:100%;padding:13px 14px;border:1px solid #cfc7c0;border-radius:10px;font-size:16px;background:#fff}
table{width:100%;border-collapse:collapse;background:#fff}
th,td{padding:12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
th{font-size:13px;color:var(--sub)}
.badge{display:inline-block;padding:4px 9px;border-radius:999px;background:#eee;font-size:12px;font-weight:700}
.badge.ok{background:#e5f3eb;color:var(--ok)} .badge.warn{background:#fff1db;color:#925d12}
.notice{padding:12px 14px;border-radius:10px;background:#eef6f1;margin-bottom:14px}.notice.error{background:#fdecec;color:#8a2f2f}
.lesson{display:flex;justify-content:space-between;gap:18px;align-items:center;padding:16px 0;border-bottom:1px solid var(--line)}
.lesson:last-child{border-bottom:0}.lesson strong{font-size:18px}
.nav{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:20px}.nav a{padding:9px 12px;border-radius:9px;background:#fff;border:1px solid var(--line);text-decoration:none;color:var(--ink)}
footer{text-align:center;color:var(--sub);padding:30px;font-size:12px}
.loginwrap{max-width:520px;margin:50px auto}.loginwrap .card{padding:30px}
@media(max-width:760px){.grid,.grid2{grid-template-columns:1fr}.topbar{padding:14px 16px}.brand{font-size:17px}.container{padding:20px 14px 50px}.lesson{align-items:flex-start;flex-direction:column}.btn{width:100%}.actions .btn{width:auto}table{font-size:14px}.hide-mobile{display:none}}