/* 班级通知控制台 · 样式（M3，无框架） */
* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, "Microsoft YaHei", sans-serif;
  background: #f4f6f9;
  color: #1f2329;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 20px;
  background: #1f3a5f;
  color: #fff;
}
header nav { display: flex; gap: 12px; }
header .link {
  background: none; border: none; color: #cfe0ff;
  font-size: 14px; cursor: pointer; padding: 4px 6px;
}
header .link:hover { color: #fff; text-decoration: underline; }

main { max-width: 760px; margin: 24px auto; padding: 0 16px; }
h2 { font-size: 20px; }

.hidden { display: none !important; }

.card {
  background: #fff;
  border: 1px solid #e3e8ef;
  border-radius: 10px;
  padding: 16px 18px;
  margin-bottom: 14px;
  box-shadow: 0 1px 2px rgba(16, 24, 40, 0.04);
}
.card.narrow { max-width: 360px; margin: 40px auto; }
.card h3 { margin: 0; font-size: 16px; }

label { display: block; margin: 10px 0; font-size: 14px; }
input {
  width: 100%; padding: 8px 10px; margin-top: 4px;
  border: 1px solid #cbd5e1; border-radius: 6px; font-size: 14px;
}
input:focus { outline: 2px solid #2f6fed33; border-color: #2f6fed; }

.btn {
  padding: 7px 14px; border: 1px solid #cbd5e1; border-radius: 6px;
  background: #fff; font-size: 14px; cursor: pointer;
}
.btn.primary { background: #2f6fed; border-color: #2f6fed; color: #fff; }
.btn.primary:hover { background: #2359c7; }
.btn:disabled { opacity: 0.5; cursor: default; }

.err { color: #d92d20; font-size: 13px; min-height: 16px; margin: 6px 0; }
.meta { color: #667085; font-size: 13px; display: flex; gap: 12px; flex-wrap: wrap; }
.content { white-space: pre-wrap; line-height: 1.6; }
.row { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.actions { margin-top: 10px; display: flex; gap: 8px; }
.overdue { color: #d92d20; }
.tag {
  border: 1px solid #d0d5dd; border-radius: 10px;
  padding: 1px 8px; font-size: 12px; color: #475467;
}

.badge {
  display: inline-block; min-width: 44px; text-align: center;
  border-radius: 10px; padding: 2px 10px; font-size: 12px; white-space: nowrap;
}
.b-unread { background: #eceef1; color: #475467; }
.b-read   { background: #fef0c7; color: #93370d; }
.b-done   { background: #d1fadf; color: #05603a; }

.lane { display: flex; align-items: baseline; gap: 10px; font-size: 14px; }
a { color: #2f6fed; }