:root {
  --primary-color: #355820;
  --primary-hover: #355820;
  --bg-color: #fff8ee;
  --card-bg: #ffffff;
  --text-color: #661220;
  --border-radius: 12px;
  --shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  padding-bottom: 50px;
}

.navbar {
  background-color: var(--card-bg);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo {
  font-size: 1.2rem;
  font-weight: bold;
  color: var(--primary-color);
}

.nav-links {
  display: flex;
  gap: 8px;
}

.nav-btn {
  background: none;
  border: none;
  padding: 8px 14px;
  font-size: 0.9rem;
  cursor: pointer;
  border-radius: 20px;
  transition: all 0.2s;
  color: #555;
}

.nav-btn.active, .nav-btn:hover {
  background-color: var(--primary-color);
  color: white;
}

.container {
  max-width: 900px;
  margin: 20px auto;
  padding: 0 16px;
}

.tab-content { display: none; }
.tab-content.active { display: block; }

.subtitle {
  color: #666;
  font-size: 0.9rem;
  margin-bottom: 16px;
}

.card, .welcome-card {
  background: var(--card-bg);
  padding: 20px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  margin-bottom: 20px;
}

.mode-selector {
  display: flex;
  gap: 10px;
  margin-top: 15px;
  flex-wrap: wrap;
}

.mode-btn {
  flex: 1;
  min-width: 200px;
  padding: 12px;
  border: 1px solid #ddd;
  background: #f9f9f9;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 500;
  transition: all 0.2s;
  text-align: center;
}

.mode-btn.active {
  background-color: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

/* 动态任务添加输入框 */
.add-task-box {
  display: flex;
  gap: 8px;
  margin: 15px 0;
}

.add-task-box input {
  flex: 1;
  padding: 8px 12px;
  border: 1px solid #ccc;
  border-radius: 6px;
}

.small-btn {
  background: var(--primary-color);
  color: white;
  border: none;
  padding: 8px 16px;
  border-radius: 6px;
  cursor: pointer;
}

.task-list {
  list-style: none;
}

.task-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px;
  border-bottom: 1px solid #eee;
}

.task-item.completed span {
  text-decoration: line-through;
  color: #aaa;
}

.toggle-btn {
  background-color: #eee;
  border: none;
  padding: 6px 12px;
  border-radius: 6px;
  cursor: pointer;
}

.task-item.completed .toggle-btn {
  background-color: var(--primary-color);
  color: white;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}

.stat-card {
  background: var(--card-bg);
  padding: 16px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  text-align: center;
}

.stat-num {
  font-size: 1.8rem;
  font-weight: bold;
  color: var(--primary-color);
  margin-top: 6px;
}

/* 动作库卡片列表 */
.grid-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}

.action-card {
  background: var(--card-bg);
  padding: 16px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  border-left: 4px solid var(--primary-color);
}

.action-card h4 {
  color: var(--primary-color);
  margin-bottom: 4px;
}

.tag {
  display: inline-block;
  background: #e8f0e9;
  color: var(--primary-color);
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 4px;
  margin-bottom: 8px;
  font-weight: bold;
}

.action-card p {
  font-size: 0.85rem;
  color: #555;
  margin-bottom: 4px;
}

/* 表单样式 */
.form-group-row {
  display: flex;
  gap: 16px;
}

.form-group-row .form-group { flex: 1; }
.form-group { margin-bottom: 12px; }

.form-group label {
  display: block;
  margin-bottom: 4px;
  font-size: 0.9rem;
}

.form-group input, .form-group select, .form-group textarea {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid #ccc;
  border-radius: 6px;
  font-size: 0.95rem;
}

.primary-btn {
  background-color: var(--primary-color);
  color: white;
  border: none;
  padding: 10px;
  border-radius: 6px;
  cursor: pointer;
  width: 100%;
  font-size: 1rem;
}

.study-grid { display: flex; flex-direction: column; gap: 16px; }
.links-grid { display: flex; flex-direction: column; gap: 8px; margin-top: 10px; }

.resource-link {
  color: var(--primary-color);
  text-decoration: none;
  padding: 10px;
  background: #f0f5f1;
  border-radius: 6px;
  font-size: 0.9rem;
}

.resource-link:hover { background: #e1ede3; }

.log-item {
  background: var(--card-bg);
  padding: 14px;
  border-radius: 8px;
  box-shadow: var(--shadow);
  margin-bottom: 12px;
}

.log-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--primary-color);
  font-weight: bold;
  margin-bottom: 6px;
}

@media (max-width: 600px) {
  .navbar { flex-direction: column; gap: 10px; }
  .mode-selector { flex-direction: column; }
  .form-group-row { flex-direction: column; gap: 0; }
}