:root {
  --primary: #9b8e82;
  --primary-light: #c4b8ae;
  --primary-dark: #7a6e63;
  --danger: #c9888a;
  --danger-light: #e8c4c5;
  --success: #8aab9c;
  --warning: #c9b17e;
  --bg: #f5f2ee;
  --surface: rgba(255, 255, 255, 0.72);
  --surface-solid: #ffffff;
  --text: #4a4440;
  --text-secondary: #9e958d;
  --text-light: #b8afa6;
  --border: rgba(0, 0, 0, 0.06);
  --shadow: 0 2px 12px rgba(120, 100, 80, 0.06);
  --shadow-md: 0 6px 20px rgba(120, 100, 80, 0.08);
  --shadow-lg: 0 12px 32px rgba(120, 100, 80, 0.1);
  --blur: blur(20px);
  --radius: 20px;
  --radius-sm: 14px;
  --radius-xs: 10px;
  --transition: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "SF Pro Display", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
  font-weight: 300;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background: var(--primary-light);
  color: #fff;
}

.nav-bar {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  height: 64px;
  background: rgba(245, 242, 238, 0.8);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border-bottom: 1px solid var(--border);
}

.nav-brand {
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--text);
  letter-spacing: 0.08em;
}

.nav-links {
  display: flex;
  gap: 2px;
}

.nav-link {
  text-decoration: none;
  padding: 8px 18px;
  border-radius: 100px;
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 400;
  letter-spacing: 0.03em;
  transition: all var(--transition);
}

.nav-link:hover {
  color: var(--text);
  background: rgba(0, 0, 0, 0.03);
}

.nav-link.active {
  background: var(--text);
  color: var(--bg);
  font-weight: 400;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--text);
  border-radius: 2px;
  transition: all var(--transition);
}

.main-content {
  max-width: 820px;
  margin: 0 auto;
  padding: 40px 20px 80px;
}

.page {
  display: none;
  animation: fadeIn 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.page.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.page-title {
  font-size: 1.4rem;
  font-weight: 400;
  margin-bottom: 28px;
  color: var(--text);
  letter-spacing: 0.04em;
}

.search-bar, .filter-bar {
  display: flex;
  gap: 10px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.search-bar input, .filter-bar input {
  flex: 1;
  min-width: 200px;
}

input[type="text"], input[type="number"], input[type="date"], select {
  padding: 11px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  font-size: 0.85rem;
  font-weight: 300;
  color: var(--text);
  background: var(--surface);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  transition: all var(--transition);
  outline: none;
  letter-spacing: 0.02em;
  font-family: inherit;
}

input::placeholder {
  color: var(--text-light);
  font-weight: 300;
}

input:focus, select:focus {
  border-color: var(--primary-light);
  box-shadow: 0 0 0 4px rgba(155, 142, 130, 0.08);
  background: var(--surface-solid);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 22px;
  border: none;
  border-radius: 100px;
  font-size: 0.82rem;
  font-weight: 400;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  letter-spacing: 0.03em;
  font-family: inherit;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0) scale(0.98);
}

.btn-primary {
  background: var(--text);
  color: var(--bg);
}

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

.btn-secondary {
  background: rgba(0, 0, 0, 0.04);
  color: var(--text-secondary);
}

.btn-secondary:hover {
  background: rgba(0, 0, 0, 0.07);
  color: var(--text);
}

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

.btn-danger:hover {
  background: #b87a7c;
  box-shadow: var(--shadow);
}

.btn-success {
  background: var(--success);
  color: #fff;
}

.btn-success:hover {
  background: #7a9d8c;
  box-shadow: var(--shadow);
}

.btn-sm {
  padding: 7px 16px;
  font-size: 0.78rem;
}

.task-form {
  background: var(--surface);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  padding: 36px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.form-group {
  margin-bottom: 22px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 400;
  font-size: 0.8rem;
  color: var(--text-secondary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.form-group input, .form-group select {
  width: 100%;
}

.required {
  color: var(--danger);
  font-weight: 400;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.form-actions {
  display: flex;
  gap: 12px;
  margin-top: 12px;
}

.task-grid {
  display: grid;
  gap: 14px;
}

.task-card {
  background: var(--surface);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border-radius: var(--radius);
  padding: 24px 28px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  border-left: 3px solid var(--primary-light);
  transition: all var(--transition);
  cursor: default;
}

.task-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
  border-color: rgba(0, 0, 0, 0.08);
}

.task-card.urgency-最紧急 { border-left-color: var(--danger); }
.task-card.urgency-比较紧急 { border-left-color: var(--warning); }
.task-card.urgency-正常紧急 { border-left-color: var(--primary-light); }
.task-card.urgency-不紧急 { border-left-color: var(--success); }

.task-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 14px;
}

.task-card-title {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text);
  letter-spacing: 0.02em;
}

.task-card-title.completed-title {
  text-decoration: line-through;
  color: var(--text-light);
  font-weight: 300;
}

.urgency-badge {
  padding: 4px 12px;
  border-radius: 100px;
  font-size: 0.7rem;
  font-weight: 400;
  white-space: nowrap;
  letter-spacing: 0.04em;
}

.urgency-badge.最紧急 { background: rgba(201, 136, 138, 0.12); color: var(--danger); }
.urgency-badge.比较紧急 { background: rgba(201, 177, 126, 0.15); color: #a89060; }
.urgency-badge.正常紧急 { background: rgba(155, 142, 130, 0.1); color: var(--primary); }
.urgency-badge.不紧急 { background: rgba(138, 171, 156, 0.12); color: #6e9480; }

.task-card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  font-weight: 300;
}

.task-card-meta span::before {
  margin-right: 4px;
}

.task-card-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.task-card-actions .btn {
  padding: 6px 14px;
  font-size: 0.75rem;
}

.task-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.empty-state {
  text-align: center;
  padding: 80px 20px;
  color: var(--text-light);
}

.empty-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
  opacity: 0.6;
}

.empty-state p {
  font-size: 0.95rem;
  margin-bottom: 20px;
  font-weight: 300;
  letter-spacing: 0.03em;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 14px;
  margin-bottom: 32px;
}

.stat-card {
  background: var(--surface);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: all var(--transition);
}

.stat-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.stat-number {
  font-size: 2.2rem;
  font-weight: 300;
  color: var(--text);
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 0.78rem;
  color: var(--text-light);
  margin-top: 6px;
  font-weight: 400;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.stats-detail {
  background: var(--surface);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  margin-bottom: 20px;
}

.stats-detail h3 {
  margin-bottom: 20px;
  font-size: 0.85rem;
  font-weight: 400;
  color: var(--text-secondary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.bar-chart {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.bar-item {
  display: flex;
  align-items: center;
  gap: 14px;
}

.bar-label {
  width: 80px;
  font-size: 0.78rem;
  text-align: right;
  color: var(--text-secondary);
  font-weight: 300;
}

.bar-track {
  flex: 1;
  height: 8px;
  background: rgba(0, 0, 0, 0.04);
  border-radius: 100px;
  overflow: hidden;
}

.bar-fill {
  height: 100%;
  border-radius: 100px;
  transition: width 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  min-width: 0;
}

.bar-value {
  width: 30px;
  font-size: 0.82rem;
  font-weight: 400;
  color: var(--text-secondary);
}

.progress-ring-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  padding: 24px;
}

.progress-ring-text {
  font-size: 1.3rem;
  font-weight: 300;
  color: var(--text);
  letter-spacing: -0.01em;
}

.toast-container {
  position: fixed;
  top: 80px;
  right: 20px;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toast {
  padding: 14px 24px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  box-shadow: var(--shadow-lg);
  font-size: 0.84rem;
  font-weight: 400;
  animation: slideIn 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94), slideOut 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94) 2.6s;
  border-left: 3px solid var(--primary-light);
  letter-spacing: 0.02em;
}

.toast.success { border-left-color: var(--success); }
.toast.error { border-left-color: var(--danger); }
.toast.warning { border-left-color: var(--warning); }

@keyframes slideIn {
  from { opacity: 0; transform: translateX(30px) translateY(-4px); }
  to { opacity: 1; transform: translateX(0) translateY(0); }
}

@keyframes slideOut {
  from { opacity: 1; transform: translateX(0); }
  to { opacity: 0; transform: translateX(30px); }
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(74, 68, 64, 0.2);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.modal-content {
  position: relative;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border-radius: var(--radius);
  padding: 36px;
  max-width: 380px;
  width: 90%;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
  animation: modalIn 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

@keyframes modalIn {
  from { opacity: 0; transform: scale(0.96) translateY(8px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-content p {
  margin-bottom: 24px;
  font-size: 0.92rem;
  line-height: 1.7;
  font-weight: 300;
  color: var(--text);
}

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

.task-card.overdue {
  background: rgba(201, 136, 138, 0.06);
}

.overdue-tag {
  color: var(--danger);
  font-weight: 400;
  font-size: 0.75rem;
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(245, 242, 238, 0.95);
    backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
    flex-direction: column;
    padding: 16px;
    border-bottom: 1px solid var(--border);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-toggle {
    display: flex;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .task-card-header {
    flex-direction: column;
    gap: 10px;
  }

  .filter-bar {
    flex-direction: column;
  }

  .filter-bar select {
    width: 100%;
  }

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

  .main-content {
    padding: 28px 16px 60px;
  }

  .nav-bar {
    padding: 0 20px;
  }

  .task-card {
    padding: 20px 22px;
  }
}

@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .task-form {
    padding: 24px 20px;
  }
}