:root {
  --bg: #f3f5f9;
  --panel: #ffffff;
  --border: #e3e8f0;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --danger: #dc2626;
  --success: #16a34a;
  --warn: #d97706;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(16, 24, 40, .08), 0 1px 2px rgba(16, 24, 40, .04);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: "Segoe UI", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ---------- 顶栏 ---------- */
.topbar {
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}
.topbar-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand-dot {
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, .15);
}
.brand h1 { font-size: 18px; font-weight: 650; }
.brand-sub { font-size: 12px; color: var(--muted); }
.topbar-right { display: flex; align-items: center; gap: 10px; font-size: 14px; }

/* ---------- 布局 ---------- */
main {
  flex: 1;
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  align-items: start;
}
@media (max-width: 820px) {
  .grid { grid-template-columns: 1fr; }
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
}
.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}
.panel-head h2 { font-size: 15px; font-weight: 650; }
.panel-head-actions { display: flex; gap: 10px; }

/* ---------- 表单 ---------- */
.login-panel {
  max-width: 440px;
  margin: 32px auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.login-panel h2 { font-size: 20px; }
.hint { font-size: 13px; color: var(--muted); line-height: 1.6; }

.field { display: flex; flex-direction: column; gap: 6px; font-size: 13px; color: var(--muted); }
.field input {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  color: var(--text);
  background: #fbfcfe;
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}
.field input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, .12);
  background: #fff;
}
form { display: flex; flex-direction: column; gap: 14px; }
.checkbox-line {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--muted);
  cursor: pointer;
}
.form-error { color: var(--danger); font-size: 13px; min-height: 18px; }

.token-box {
  border-top: 1px dashed var(--border);
  padding-top: 14px;
  font-size: 13px;
  color: var(--muted);
}
.token-box summary { cursor: pointer; user-select: none; }
.token-box form { margin-top: 12px; }

/* ---------- 按钮 ---------- */
.btn {
  padding: 9px 18px;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s, transform .05s, opacity .15s;
}
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--primary-dark); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover:not(:disabled) { background: #b91c1c; }
.btn-secondary { background: #eef2f7; color: var(--text); }
.btn-secondary:hover:not(:disabled) { background: #e2e8f0; }
.btn-block { width: 100%; }
.btn-link {
  background: none;
  border: none;
  color: var(--primary);
  font-size: 13px;
  cursor: pointer;
  padding: 2px 4px;
}
.btn-link:hover { text-decoration: underline; }

/* ---------- 控制条 ---------- */
.control-bar {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}
.monitor-actions { display: flex; gap: 10px; }
.monitor-status { display: flex; flex-direction: column; gap: 4px; font-size: 12px; color: var(--muted); }
.badge {
  align-self: flex-start;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  background: #e5e7eb;
  color: #4b5563;
}
.badge.running { background: #dcfce7; color: #15803d; }
.badge.stopped { background: #fee2e2; color: #b91c1c; }
.settings-box { margin-left: auto; font-size: 13px; color: var(--muted); }
.settings-box summary { cursor: pointer; user-select: none; }
.settings-grid {
  margin-top: 12px;
  display: grid;
  grid-template-columns: 130px 1fr 1fr auto;
  gap: 10px;
  align-items: end;
}
@media (max-width: 820px) {
  .settings-grid { grid-template-columns: 1fr; }
  .settings-box { margin-left: 0; }
}

/* ---------- 课程列表 ---------- */
.course-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 420px;
  overflow-y: auto;
}
.course-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
  transition: border-color .15s, background .15s;
}
.course-item:hover { border-color: #c7d2fe; background: #f8faff; }
.course-item.checked { border-color: var(--primary); background: #eff6ff; }
.course-item input { margin-top: 3px; accent-color: var(--primary); }
.course-name { font-size: 14px; font-weight: 600; }
.course-meta { font-size: 12px; color: var(--muted); margin-top: 2px; }

/* ---------- 活动列表 ---------- */
.activity-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 420px;
  overflow-y: auto;
}
.empty { font-size: 13px; color: var(--muted); padding: 12px 0; }
.activity-item {
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.activity-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}
.activity-title { font-size: 14px; font-weight: 600; }
.tag {
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
  background: #eef2f7;
  color: #475569;
  white-space: nowrap;
}
.tag.type-1 { background: #fef3c7; color: #92400e; }
.tag.type-2 { background: #dbeafe; color: #1e40af; }
.tag.type-3 { background: #dcfce7; color: #15803d; }
.activity-meta { font-size: 12px; color: var(--muted); }
.activity-result { font-size: 13px; font-weight: 600; }
.activity-result.success { color: var(--success); }
.activity-result.muted { color: var(--muted); }
.activity-result.warn { color: var(--warn); }
.activity-result.error { color: var(--danger); }
.activity-form { display: flex; gap: 8px; }
.activity-form input {
  flex: 1;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 13px;
  outline: none;
}
.activity-form input:focus { border-color: var(--primary); }

/* ---------- 签到记录 ---------- */
.records-days { font-size: 13px; color: var(--muted); display: flex; align-items: center; gap: 4px; }
.records-days input {
  padding: 5px 6px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 13px;
  outline: none;
  text-align: center;
}
.records-meta { font-size: 12px; color: var(--muted); margin-bottom: 10px; min-height: 16px; }
.records-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 360px;
  overflow-y: auto;
}
.record-item {
  display: grid;
  grid-template-columns: 52px 1.4fr 1.6fr 92px auto auto;
  gap: 10px;
  align-items: center;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 13px;
}
@media (max-width: 820px) {
  .record-item { grid-template-columns: 48px 1fr auto auto; }
  .record-activity, .record-kind { display: none; }
}
.record-date { font-weight: 650; color: var(--text); }
.record-course { color: var(--text); }
.record-activity { color: var(--muted); }
.record-kind { color: var(--muted); font-size: 12px; }
.record-status { display: flex; align-items: center; gap: 8px; }
.tag.signed { background: #dcfce7; color: #15803d; }
.tag.unsigned { background: #f3f4f6; color: #6b7280; }
.tag.local-signed { background: #fef9c3; color: #854d0e; }
.record-time { font-size: 12px; color: var(--muted); }
.record-actions { display: flex; gap: 6px; align-items: center; justify-content: flex-end; flex-wrap: wrap; }
.record-actions .record-code {
  width: 88px;
  padding: 5px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 13px;
  outline: none;
}
.record-actions .record-code:focus { border-color: var(--primary); }
.record-actions .record-sign-btn { padding: 4px 10px; font-size: 12px; white-space: nowrap; }
.record-actions .record-status-select {
  padding: 5px 7px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
  color: var(--text);
  font-size: 12px;
  outline: none;
}
.record-actions .record-status-select:focus { border-color: var(--primary); }
.record-actions .record-status-btn,
.record-actions .record-cancel-btn { padding: 4px 9px; font-size: 12px; white-space: nowrap; }

/* ---------- 教师更正服务 ---------- */
.teacher-box { min-width: 280px; }
.teacher-status { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.5; }
.teacher-status.ready { color: var(--success); }
.teacher-actions { display: flex; gap: 8px; flex-wrap: wrap; }

/* ---------- 事件流 ---------- */
.event-log {
  font-family: Consolas, "Cascadia Mono", monospace;
  font-size: 12.5px;
  line-height: 1.7;
  max-height: 320px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}
.event-line { display: flex; gap: 8px; padding: 1px 0; }
.event-time { color: #9ca3af; flex-shrink: 0; }
.event-text { word-break: break-all; }
.event-info { color: var(--text); }
.event-success { color: var(--success); }
.event-warn { color: var(--warn); }
.event-error { color: var(--danger); }
.event-muted { color: #9ca3af; }

/* ---------- 页脚 ---------- */
footer {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px 24px;
  width: 100%;
}
footer p { font-size: 12px; color: #9ca3af; line-height: 1.6; }

/* ---------- 移动端适配 ---------- */
@media (max-width: 480px) {
  .topbar-inner { padding: 10px 14px; gap: 8px; flex-wrap: wrap; }
  .brand h1 { font-size: 16px; }
  .brand-sub { display: none; }
  .topbar-right { gap: 6px; font-size: 12px; flex-wrap: wrap; }
  main { padding: 12px; gap: 12px; }
  .panel { padding: 14px; }
  .login-panel { margin: 12px auto; }
  .btn { padding: 11px 16px; font-size: 15px; }  /* 触屏友好高度 */
  .control-bar { gap: 10px; }
  .settings-box { margin-left: 0; }
  .activity-form input { font-size: 15px; }      /* iOS 输入框 ≥16px 防自动放大 */
  .field input { font-size: 16px; }
  .records-days input { font-size: 16px; }
  .record-actions .record-code { font-size: 16px; width: 76px; }
  .record-actions .record-status-select { font-size: 16px; max-width: 118px; }
  .event-log { font-size: 11.5px; }
  .record-item { padding: 8px 10px; gap: 6px; }
  footer { padding: 0 14px 16px; }
  /* 刘海屏安全区 */
  body { padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left); }
}