:root {
  --bg: #f3f5f8;
  --panel: #ffffff;
  --line: #e5e7eb;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #1459c7;
  --success: #15803d;
  --warning: #c2410c;
  --danger: #b91c1c;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
}

.login-screen {
  position: fixed;
  inset: 0;
  background: linear-gradient(135deg, #dbeafe, #eff6ff 40%, #e0f2fe);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
}

.login-screen.hidden {
  display: none;
}

.login-card {
  width: min(420px, calc(100vw - 32px));
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: 24px;
  padding: 28px;
  box-shadow: 0 30px 80px rgba(15, 23, 42, 0.16);
  display: grid;
  gap: 12px;
}

.login-card h2 {
  margin: 0;
}

.login-card p {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 14px;
}

.login-card label {
  display: grid;
  gap: 6px;
  font-size: 14px;
}

.login-card input {
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
}

.login-error {
  min-height: 20px;
  color: var(--danger);
  font-size: 13px;
}

.layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  min-height: 100vh;
}

.sidebar {
  background: #0f172a;
  color: #fff;
  padding: 24px 16px;
}

.brand {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 24px;
  line-height: 1.4;
}

.menu {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.menu-item {
  border: 0;
  background: transparent;
  color: rgba(255, 255, 255, 0.72);
  text-align: left;
  padding: 12px 14px;
  border-radius: 10px;
  cursor: pointer;
}

.menu-item.active,
.menu-item:hover {
  background: rgba(20, 89, 199, 0.35);
  color: #fff;
}

.content {
  padding: 24px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.current-user {
  color: var(--muted);
  font-size: 14px;
}

.section {
  display: none;
}

.section.active {
  display: block;
}

.cards,
.grid-two {
  display: grid;
  gap: 16px;
  margin-bottom: 16px;
}

.cards {
  grid-template-columns: repeat(4, 1fr);
}

.grid-two {
  grid-template-columns: repeat(2, 1fr);
}

.card,
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 18px;
}

.stat-label {
  color: var(--muted);
  font-size: 13px;
}

.stat-value {
  font-size: 30px;
  font-weight: 700;
  margin-top: 10px;
}

.panel-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 14px;
}

.with-action {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

.simple-table th,
.simple-table td {
  border-bottom: 1px solid var(--line);
  padding: 10px 8px;
  font-size: 13px;
  text-align: left;
  vertical-align: top;
}

.simple-table th {
  color: var(--muted);
  font-weight: 600;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.form-grid label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 13px;
}

.form-grid input,
.form-grid select,
button {
  font: inherit;
}

.form-grid input,
.form-grid select {
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #fff;
}

.full {
  grid-column: 1 / -1;
}

button.primary,
button.secondary,
button.danger {
  border: 0;
  border-radius: 10px;
  padding: 9px 12px;
  cursor: pointer;
}

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

button.secondary {
  background: #eff6ff;
  color: var(--primary);
}

button.danger {
  background: #fee2e2;
  color: var(--danger);
}

.tag {
  display: inline-block;
  padding: 3px 8px;
  border-radius: 999px;
  font-size: 12px;
}

.tag.blue {
  background: #dbeafe;
  color: #1d4ed8;
}

.tag.green {
  background: #dcfce7;
  color: #15803d;
}

.tag.orange {
  background: #ffedd5;
  color: #c2410c;
}

.tag.red {
  background: #fee2e2;
  color: #b91c1c;
}

.toast {
  min-height: 24px;
  color: var(--muted);
}

.upload-inline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.empty,
.notes {
  color: var(--muted);
  font-size: 14px;
}

.subtasks {
  display: grid;
  gap: 10px;
}

.subtask-card {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px;
  background: #fafafa;
}

.subtask-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.subtask-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 10px;
}

@media (max-width: 1080px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    padding-bottom: 8px;
  }

  .cards,
  .grid-two,
  .form-grid {
    grid-template-columns: 1fr;
  }
}