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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  padding: 20px;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
}

header {
  text-align: center;
  color: white;
  margin-bottom: 30px;
}

header h1 {
  font-size: 2.5em;
  margin-bottom: 10px;
}

header p {
  opacity: 0.9;
}

/* 统计面板 */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 20px;
  margin-bottom: 30px;
}

.stat-card {
  background: white;
  padding: 15px;
  border-radius: 10px;
  text-align: center;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.stat-card h3 {
  color: #667eea;
  font-size: 1.8em;
  margin-bottom: 5px;
}

.stat-card p {
  color: #666;
  font-size: 0.9em;
}

/* 内容区域 */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
  gap: 30px;
  margin-bottom: 30px;
}

.section-box {
  background: white;
  border-radius: 10px;
  padding: 20px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.section-box h2 {
  color: #333;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid #667eea;
}

/* 日历组件 */
.calendar {
  background: #f8f9fa;
  padding: 15px;
  border-radius: 8px;
}

.calendar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
}

.calendar-header button {
  background: #667eea;
  color: white;
  border: none;
  padding: 8px 12px;
  border-radius: 5px;
  cursor: pointer;
}

.calendar-header button:hover {
  background: #5568d3;
}

.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 2px;
}

.calendar-day-header {
  text-align: center;
  font-weight: bold;
  color: #666;
  padding: 5px;
  font-size: 0.9em;
}

.calendar-day {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background: white;
  border-radius: 5px;
  cursor: pointer;
  position: relative;
  transition: all 0.2s;
}

.calendar-day:hover {
  background: #eef1f5;
  transform: scale(1.05);
}

.calendar-day.today {
  background: #667eea;
  color: white;
  font-weight: bold;
}

.calendar-day.selected {
  border: 2px solid #667eea;
}

.calendar-day.has-diary::after {
  content: '📝';
  font-size: 0.7em;
  position: absolute;
  bottom: 2px;
}

.calendar-day.empty {
  cursor: default;
  background: transparent;
}

/* 日记详情 */
.diary-detail {
  padding: 15px;
}

.diary-section {
  margin: 15px 0;
}

.section-title {
  font-weight: bold;
  color: #555;
  margin-bottom: 8px;
}

.section-content {
  color: #666;
  line-height: 1.6;
  white-space: pre-wrap;
  margin-left: 20px;
}

/* 经验总结 */
.experience-item {
  padding: 15px;
  border-left: 4px solid #f59e0b;
  background: #fffbeb;
  margin-bottom: 15px;
  border-radius: 5px;
}

.experience-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.experience-title {
  font-weight: bold;
  color: #333;
}

.experience-category {
  background: #f59e0b;
  color: white;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.85em;
}

.experience-problem, .experience-solution {
  margin: 10px 0;
}

.experience-problem-title {
  font-weight: bold;
  color: #dc2626;
  margin-bottom: 5px;
}

.experience-solution-title {
  font-weight: bold;
  color: #059669;
  margin-bottom: 5px;
}

.experience-lesson {
  margin: 10px 0;
  padding: 10px;
  background: #fef3c7;
  border-radius: 5px;
}

.experience-lesson-title {
  font-weight: bold;
  color: #92400e;
  margin-bottom: 5px;
}

/* 状态 */
.loading {
  text-align: center;
  padding: 40px;
  color: white;
  font-size: 1.2em;
}

.error {
  background: #fee;
  color: #c00;
  padding: 20px;
  border-radius: 10px;
  margin-bottom: 20px;
}

.empty-state {
  text-align: center;
  padding: 40px;
  color: #999;
}

/* 认证界面 */
.auth-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 20px;
}

.auth-card {
  background: white;
  padding: 40px;
  border-radius: 10px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.2);
  width: 100%;
  max-width: 400px;
}

.auth-card h1 {
  color: #667eea;
  font-size: 2em;
  text-align: center;
  margin-bottom: 10px;
}

.auth-card h2 {
  color: #333;
  font-size: 1.5em;
  text-align: center;
  margin-bottom: 30px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  color: #555;
  font-weight: 500;
  margin-bottom: 8px;
}

.form-group input {
  width: 100%;
  padding: 12px;
  border: 1px solid #ddd;
  border-radius: 5px;
  font-size: 1em;
  transition: border-color 0.2s;
}

.form-group input:focus {
  outline: none;
  border-color: #667eea;
}

.btn-primary {
  width: 100%;
  padding: 12px;
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: white;
  border: none;
  border-radius: 5px;
  font-size: 1.1em;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s;
}

.btn-primary:hover {
  transform: translateY(-2px);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.auth-tip {
  text-align: center;
  margin-top: 20px;
  color: #666;
}

.auth-tip a {
  color: #667eea;
  text-decoration: none;
}

.auth-tip a:hover {
  text-decoration: underline;
}

/* 用户信息 */
.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 15px;
  color: white;
}

.btn-logout {
  padding: 8px 16px;
  background: rgba(255,255,255,0.2);
  color: white;
  border: 1px solid rgba(255,255,255,0.5);
  border-radius: 5px;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-logout:hover {
  background: rgba(255,255,255,0.3);
}

/* 移动端 */
@media (max-width: 768px) {
  .grid-2 {
    grid-template-columns: 1fr;
  }
}