:root{--navy-900:#0d1526;--navy-800:#16233d;--navy-700:#1e2f4f;--cyan:#29c5e6;--cyan-dim:#1ba3c0;--ink:#10192b;--muted:#64748b;--line:#e2e8f0;--bg:#ffffff;--surface:#f6f8fb}*{box-sizing:border-box}body,html{padding:0;margin:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Hiragino Sans,Noto Sans JP,Meiryo,sans-serif;color:var(--ink);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}.container{max-width:1120px;margin:0 auto;padding:0 24px}.hdr{background:var(--navy-900);color:#fff}.hdr-in{justify-content:space-between;height:64px}.brand,.hdr-in{display:flex;align-items:center}.brand{gap:10px;font-weight:700;letter-spacing:.02em}.brand-bar{width:4px;height:22px;background:var(--cyan);border-radius:2px}.hdr-nav{display:flex;align-items:center;gap:20px;font-size:14px}.hdr-nav a{opacity:.85}.hdr-nav a:hover{opacity:1}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 22px;border-radius:6px;border:1px solid transparent;font-size:15px;font-weight:600;cursor:pointer;font-family:inherit;transition:background .15s,border-color .15s,opacity .15s}.btn-primary{background:var(--cyan);color:#06222b}.btn-primary:hover{background:var(--cyan-dim)}.btn-ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.35)}.btn-ghost:hover{border-color:#fff}.btn-sm{padding:6px 12px;font-size:13px;border-radius:5px}.btn-outline{background:#fff;border-color:var(--line);color:var(--ink)}.btn-outline:hover{border-color:var(--muted)}.btn-danger{background:#fff;border-color:#fecaca;color:#b91c1c}.btn-danger:hover{background:#fef2f2}.btn:disabled{opacity:.5;cursor:not-allowed}.field{display:block;margin-bottom:16px}.field label{display:block;font-size:13px;font-weight:600;margin-bottom:6px;color:#334155}.field input,.field select{width:100%;padding:11px 13px;border:1px solid var(--line);border-radius:6px;font-size:15px;font-family:inherit;background:#fff;color:var(--ink)}.field input:focus,.field select:focus{outline:2px solid var(--cyan);outline-offset:-1px;border-color:transparent}.alert{padding:12px 14px;border-radius:6px;font-size:14px;margin-bottom:16px}.alert-err{background:#fef2f2;color:#b91c1c;border:1px solid #fecaca}.alert-ok{background:#ecfdf5;color:#047857;border:1px solid #a7f3d0}.alert-warn{background:#fffbeb;color:#92400e;border:1px solid #fde68a}.table{width:100%;border-collapse:collapse;font-size:14px}.table td,.table th{padding:12px 14px;text-align:left;border-bottom:1px solid var(--line)}.table th{font-size:12px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);background:var(--surface)}.table tr:hover td{background:#fafcff}.tag{display:inline-block;padding:2px 9px;border-radius:999px;font-size:12px;font-weight:600}.tag-admin{background:#e0f2fe;color:#075985}.tag-student{background:#f1f5f9;color:#475569}.tag-wait{background:#fef3c7;color:#92400e}.tag-ok{background:#dcfce7;color:#166534}.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:8px}