* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  background: #f6f7f9;
  color: #1c1c1e;
}
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 24px;
  background: #1c1c1e;
}
.topbar .brand { color: #fff; font-weight: 600; text-decoration: none; }
.topbar nav a {
  color: #cfcfd2;
  text-decoration: none;
  margin-left: 18px;
  font-size: 14px;
}
.topbar nav a:hover { color: #fff; }
.container { max-width: 960px; margin: 32px auto; padding: 0 20px; }

.flash {
  padding: 10px 14px;
  border-radius: 8px;
  margin-bottom: 16px;
  font-size: 14px;
}
.flash-error { background: #fde2e1; color: #8a1f1f; }
.flash-success { background: #e1f5e6; color: #1f6b32; }

.card {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: 0 1px 3px rgba(0,0,0,.06);
}

.seminar-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px,1fr)); gap: 16px; }
.seminar-card { display:block; text-decoration:none; color:inherit; }
.seminar-card h3 { margin: 0 0 6px; font-size: 16px; }
.seminar-card p { margin: 0; color: #6b6b70; font-size: 13px; }

form input, form select {
  display:block; width:100%; padding:10px 12px; margin-bottom:12px;
  border:1px solid #d8d8db; border-radius:8px; font-size:14px;
}
button, .btn {
  background:#1c1c1e; color:#fff; border:none; border-radius:8px;
  padding:10px 16px; font-size:14px; cursor:pointer;
}
button.secondary { background:#e5e5e7; color:#1c1c1e; }
button.danger { background:#c43d3d; }

table { width:100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align:left; padding:10px 8px; border-bottom:1px solid #eee; }
.badge { display:inline-block; padding:2px 8px; border-radius:12px; font-size:12px; }
.badge-ok { background:#e1f5e6; color:#1f6b32; }
.badge-no { background:#fde2e1; color:#8a1f1f; }

#player-wrap { position: relative; width: 100%; max-width: 960px; }
#player-wrap video { width: 100%; border-radius: 10px; background:#000; }
#watermark {
  position: absolute; pointer-events: none; color: rgba(255,255,255,0.55);
  font-size: 13px; padding: 6px 10px; border-radius: 6px;
  background: rgba(0,0,0,0.15); user-select: none;
}