:root {
  --primary: #1677ff;
  --primary-dark: #0958d9;
  --bg: #f2f5f9;
  --card: #ffffff;
  --text: #1f2733;
  --muted: #7a8699;
  --border: #e3e8ef;
  --danger: #e5484d;
  --ok: #2f9e6e;
  --warn: #d97706;
  --radius: 12px;
}

* { box-sizing: border-box; }

/* 作者样式（如 .login-page 的 display:flex）会覆盖 hidden 属性的默认 display:none，必须强制 */
[hidden] { display: none !important; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  line-height: 1.6;
}

a { color: var(--primary); text-decoration: none; }

.wrap {
  max-width: 960px;
  margin: 0 auto;
  padding: 16px;
}

/* 登录页 */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px 16px;
  background: linear-gradient(160deg, #eaf2ff 0%, #f2f5f9 55%);
}

.login-card {
  width: 100%;
  max-width: 380px;
  background: var(--card);
  border-radius: 16px;
  box-shadow: 0 8px 30px rgba(31, 39, 51, 0.08);
  padding: 32px 28px 24px;
}

.login-card h1 {
  margin: 0 0 4px;
  font-size: 22px;
  text-align: center;
}

.login-card .sub {
  margin: 0 0 24px;
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

.field { margin-bottom: 14px; }

.field label {
  display: block;
  margin-bottom: 6px;
  font-size: 13px;
  color: var(--muted);
}

.field input, .field select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 15px;
  background: #fff;
  color: var(--text);
  outline: none;
}

.field input:focus, .field select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(22, 119, 255, 0.12);
}

.btn {
  display: inline-block;
  padding: 10px 18px;
  border: none;
  border-radius: 8px;
  background: var(--primary);
  color: #fff;
  font-size: 15px;
  cursor: pointer;
}

.btn:hover { background: var(--primary-dark); }

.btn.block { width: 100%; }

.btn.ghost {
  background: #fff;
  color: var(--primary);
  border: 1px solid var(--primary);
}

.btn.small {
  padding: 5px 10px;
  font-size: 13px;
  border-radius: 6px;
}

.btn.danger { background: var(--danger); }

.btn.muted {
  background: #eef1f5;
  color: var(--text);
}

.form-error {
  min-height: 20px;
  margin: 4px 0 8px;
  color: var(--danger);
  font-size: 13px;
  text-align: center;
}

.login-foot {
  margin-top: 18px;
  text-align: center;
  font-size: 13px;
}

/* 顶栏 */
.topbar {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.topbar .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 10px;
  padding-bottom: 10px;
}

.topbar .title { font-weight: 600; font-size: 16px; }

.topbar .who { color: var(--muted); font-size: 13px; margin-right: 12px; }

/* 成绩页 */
.student-head {
  background: linear-gradient(135deg, var(--primary) 0%, #4096ff 100%);
  color: #fff;
  border-radius: var(--radius);
  padding: 18px 20px;
  margin-bottom: 16px;
}

.student-head .name { font-size: 20px; font-weight: 600; }

.student-head .meta { opacity: 0.9; font-size: 13px; margin-top: 2px; }

.exam-card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: 0 2px 10px rgba(31, 39, 51, 0.05);
  margin-bottom: 16px;
  overflow: hidden;
}

.exam-card .head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 14px 18px 10px;
  border-bottom: 1px solid var(--border);
}

.exam-card .head .ename { font-weight: 600; font-size: 16px; }

.exam-card .head .edate { color: var(--muted); font-size: 13px; }

.exam-card table { width: 100%; border-collapse: collapse; }

.exam-card th, .exam-card td {
  padding: 9px 18px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}

.exam-card th { color: var(--muted); font-weight: 500; font-size: 13px; }

.exam-card tr:last-child td { border-bottom: none; }

.exam-card td.score { font-variant-numeric: tabular-nums; font-weight: 600; }

.rank-badges {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  padding: 12px 18px 16px;
}

.badge {
  background: #eef5ff;
  color: var(--primary-dark);
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 13px;
}

.badge.total { background: #e8f7ef; color: var(--ok); font-weight: 600; }

.empty {
  text-align: center;
  color: var(--muted);
  padding: 60px 0;
}

/* 管理后台 */
.tabs {
  display: flex;
  gap: 4px;
  background: var(--card);
  border-radius: 10px;
  padding: 4px;
  margin-bottom: 16px;
  overflow-x: auto;
}

.tabs button {
  flex: 1;
  min-width: 72px;
  padding: 9px 12px;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  font-size: 14px;
  cursor: pointer;
  white-space: nowrap;
}

.tabs button.active {
  background: var(--primary);
  color: #fff;
}

.panel {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: 0 2px 10px rgba(31, 39, 51, 0.05);
  padding: 18px;
}

.panel h2 { margin: 0 0 14px; font-size: 16px; }

.form-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: flex-end;
  margin-bottom: 14px;
}

.form-row .field { margin-bottom: 0; flex: 1; min-width: 120px; }

.table-scroll { overflow-x: auto; }

table.grid {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

table.grid th, table.grid td {
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  white-space: nowrap;
}

table.grid th {
  color: var(--muted);
  font-weight: 500;
  font-size: 13px;
  background: #fafbfc;
}

table.grid input.cell {
  width: 64px;
  padding: 5px 6px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
}

table.grid input.cell:focus {
  border-color: var(--primary);
  outline: none;
}

.tag {
  display: inline-block;
  border-radius: 4px;
  padding: 1px 8px;
  font-size: 12px;
}

.tag.on { background: #e8f7ef; color: var(--ok); }
.tag.off { background: #fdecec; color: var(--danger); }

.row-err { color: var(--danger); font-size: 12px; }

.hint { color: var(--muted); font-size: 13px; margin: 6px 0 12px; }

.chk {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  padding: 8px 0;
  white-space: nowrap;
}

.errlist {
  background: #fff7ed;
  border: 1px solid #fed7aa;
  color: #9a3412;
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 13px;
  margin-bottom: 12px;
  max-height: 160px;
  overflow: auto;
}

/* 弹窗（家长自助修改密码） */
.modal-mask {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: rgba(31, 39, 51, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  z-index: 50;
}

.modal-card {
  width: 100%;
  max-width: 380px;
  max-height: 90vh;
  overflow: auto;
  background: var(--card);
  border-radius: 16px;
  box-shadow: 0 12px 40px rgba(31, 39, 51, 0.2);
  padding: 24px 22px 20px;
}

.modal-card h2 { margin: 0 0 16px; font-size: 18px; }

.modal-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  margin-top: 4px;
}

/* Toast */
#toast {
  position: fixed;
  left: 50%;
  bottom: 32px;
  transform: translateX(-50%);
  background: rgba(31, 39, 51, 0.92);
  color: #fff;
  border-radius: 8px;
  padding: 10px 18px;
  font-size: 14px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s;
  z-index: 99;
  max-width: 86vw;
}

#toast.show { opacity: 1; }

@media (max-width: 640px) {
  .wrap { padding: 12px; }
  .exam-card th, .exam-card td { padding: 8px 14px; }
  .form-row .field { min-width: 100%; }
  /* 顶栏放不下三个元素：隐藏"xx的家长"，下方成绩卡片已展示姓名 */
  .topbar .who { display: none; }
  .topbar .btn.small { padding: 5px 8px; }
}