/* ===== 基础重置 ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* ===== 变量定义 ===== */
:root {
  --sakura-pink: #FFB7C5;
  --sakura-dark: #E8A0B0;
  --mint-green: #98D8C8;
  --mint-dark: #7BC4B4;
  --bg-light: #FAFAFA;
  --bg-card: #FFFFFF;
  --text-dark: #2D2D2D;
  --text-light: #666666;
  --shadow-soft: 0 4px 20px rgba(255, 183, 197, 0.25);
  --shadow-hover: 0 8px 30px rgba(255, 183, 197, 0.4);
  --radius: 16px;
  --radius-sm: 8px;
  --border-color: #E8E8E8;
  --success-color: #2e8b57;
  --warning-color: #f39c12;
  --danger-color: #e74c3c;
  --info-color: #3498db;
}

/* ===== 深色模式变量 ===== */
body.dark-mode {
  --bg-light: #1a1a2e;
  --bg-card: #16213e;
  --text-dark: #E8E8E8;
  --text-light: #A0A0A0;
  --shadow-soft: 0 4px 20px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.4);
  --border-color: #2D3A4A;
}

body.dark-mode .navbar,
body.dark-mode .footer,
body.dark-mode .modal-content,
body.dark-mode .course-card-main,
body.dark-mode .help-card,
body.dark-mode .todo-item,
body.dark-mode .homework-card {
  background: var(--bg-card);
  border-color: var(--border-color);
}

body.dark-mode .course-desc,
body.dark-mode .todo-text,
body.dark-mode .homework-desc,
body.dark-mode .help-card p {
  color: var(--text-light);
}

body.dark-mode .nav-links a:hover,
body.dark-mode .section-title {
  color: var(--sakura-pink);
}

/* ===== Toast 通知 ===== */
.toast-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toast {
  background: var(--bg-card);
  color: var(--text-dark);
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-soft);
  border-left: 4px solid var(--info-color);
  font-size: 0.9rem;
  animation: toastSlideIn 0.3s ease;
  max-width: 320px;
}

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

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

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

.toast.toast-out {
  animation: toastSlideOut 0.3s ease forwards;
}

@keyframes toastSlideIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes toastSlideOut {
  from {
    transform: translateX(0);
    opacity: 1;
  }
  to {
    transform: translateX(100%);
    opacity: 0;
  }
}

/* ===== 基础样式 ===== */
html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Microsoft YaHei', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
  /* 樱花主题渐变背景 */
  background: linear-gradient(135deg, #ffeef2 0%, #fff5f7 25%, #ffe4ec 50%, #fff0f5 75%, #ffe8f0 100%);
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  background-repeat: no-repeat;
  color: var(--text-dark);
  line-height: 1.7;
  overflow-x: hidden;
}

/* 添加樱花纹理叠加效果 */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(255, 183, 197, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(152, 216, 200, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0.3) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== 樱花飘落动画 ===== */
.sakura-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.sakura {
  position: absolute;
  top: -20px;
  color: var(--sakura-pink);
  opacity: 0.7;
  font-size: 20px;
  animation: fall linear infinite;
}

@keyframes fall {
  0% {
    transform: translateY(-20px) rotate(0deg) translateX(0);
    opacity: 0.7;
  }
  100% {
    transform: translateY(100vh) rotate(360deg) translateX(100px);
    opacity: 0.2;
  }
}

/* ===== 导航栏 ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 183, 197, 0.3);
}

.nav-content {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 60px;
}

.nav-logo {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--sakura-dark);
  letter-spacing: 1px;
}

.nav-links {
  display: flex;
  gap: 30px;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-light);
  transition: color 0.3s ease;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--sakura-pink);
  transition: width 0.3s ease;
}

.nav-links a:hover {
  color: var(--sakura-dark);
}

.nav-links a:hover::after {
  width: 100%;
}

/* ===== 主内容区 ===== */
.main-content {
  position: relative;
  z-index: 1;
  padding-top: 60px;
}

.section {
  padding: 80px 0;
}

/* ===== 区块标题头部（标题+按钮） ===== */
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
}

.section-header .section-title {
  margin-bottom: 0;
}

.section-header .section-title::after {
  display: none;
}

/* ===== 通用标题 ===== */
.section-title {
  text-align: center;
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 50px;
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--sakura-pink), var(--mint-green));
  margin: 15px auto 0;
  border-radius: 2px;
}

/* ===== 淡入动画 ===== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== 课程介绍区 ===== */
.course-info-section {
  min-height: calc(100vh - 60px);
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.75);
}

.course-info-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  padding: 50px;
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.course-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--sakura-dark);
  margin-bottom: 10px;
}

.course-subtitle {
  font-size: 1rem;
  color: var(--text-light);
  margin-bottom: 30px;
}

.course-highlights {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 15px;
  margin-bottom: 35px;
}

.highlight-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: linear-gradient(135deg, rgba(255, 183, 197, 0.2), rgba(152, 216, 200, 0.2));
  border-radius: 25px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-dark);
}

.highlight-icon {
  font-size: 1.2rem;
}

.course-details {
  text-align: left;
  border-top: 1px solid rgba(255, 183, 197, 0.3);
  padding-top: 30px;
  margin-bottom: 30px;
}

.detail-row {
  display: flex;
  justify-content: space-between;
  padding: 10px 0;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.detail-label {
  font-weight: 500;
  color: var(--text-dark);
}

.detail-value {
  color: var(--text-light);
}

.course-assessment h3 {
  font-size: 1.1rem;
  color: var(--text-dark);
  margin-bottom: 20px;
}

.assessment-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.assessment-item {
  padding: 20px;
  background: linear-gradient(135deg, rgba(255, 183, 197, 0.15), rgba(152, 216, 200, 0.15));
  border-radius: var(--radius);
  text-align: center;
}

.assessment-percent {
  display: block;
  font-size: 2rem;
  font-weight: 700;
  color: var(--sakura-dark);
  margin-bottom: 5px;
}

.assessment-desc {
  font-size: 0.9rem;
  color: var(--text-light);
  line-height: 1.5;
}

/* ===== 个人介绍区 ===== */
.about-section {
  min-height: calc(100vh - 60px);
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.7);
}

.about-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  padding: 50px;
  display: flex;
  gap: 50px;
  align-items: center;
  max-width: 800px;
  margin: 0 auto;
  position: relative;
}

.edit-profile-btn {
  position: absolute;
  top: 20px;
  right: 20px;
  background: var(--sakura-pink);
  color: white;
  border: none;
  border-radius: 20px;
  padding: 8px 16px;
  font-size: 0.85rem;
  cursor: pointer;
  opacity: 0.8;
  transition: opacity 0.2s;
}

.edit-profile-btn:hover {
  opacity: 1;
}

.avatar-wrapper {
  flex-shrink: 0;
}

.avatar {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--sakura-pink), var(--mint-green));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 60px;
  box-shadow: 0 0 30px rgba(255, 183, 197, 0.5);
  border: 4px solid var(--bg-card);
}

.about-info {
  flex: 1;
}

.name {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 5px;
}

.nickname {
  font-size: 1rem;
  color: var(--text-light);
  margin-bottom: 20px;
}

.bio {
  font-size: 1rem;
  color: var(--text-light);
  line-height: 1.8;
  margin-bottom: 25px;
}

.github-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: var(--text-dark);
  color: white;
  border-radius: 30px;
  font-size: 0.95rem;
  font-weight: 500;
  transition: all 0.3s ease;
}

.github-link:hover {
  background: var(--sakura-dark);
  transform: translateY(-2px);
  box-shadow: 0 5px 20px rgba(255, 183, 197, 0.4);
}

.about-links {
  display: flex;
  gap: 10px;
}

/* ===== 首页课程卡片 ===== */
.course-card-main {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 25px;
  box-shadow: var(--shadow-soft);
  transition: all 0.3s ease;
  border: 2px solid transparent;
}

.course-card-main:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
  border-color: var(--sakura-pink);
}

.course-edit-btn {
  position: absolute;
  top: 15px;
  right: 15px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--border-color);
  border-radius: 50%;
  width: 32px;
  height: 32px;
  font-size: 0.9rem;
  cursor: pointer;
  opacity: 0.6;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.course-card-main:hover .course-edit-btn {
  opacity: 1;
}

.course-edit-btn:hover {
  background: var(--sakura-pink);
  color: white;
}

.course-card-header {
  display: flex;
  align-items: center;
  gap: 15px;
  margin-bottom: 15px;
}

.course-card-header .course-icon {
  font-size: 2.5rem;
}

.course-card-header .course-info {
  flex: 1;
}

.course-card-header .course-info h3 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 5px;
}

.course-progress {
  margin: 20px 0;
}

.progress-bar {
  height: 8px;
  background: rgba(255, 183, 197, 0.2);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 8px;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--sakura-pink), var(--mint-green));
  border-radius: 4px;
  transition: width 0.3s ease;
}

.progress-10 { width: 10%; }
.progress-20 { width: 20%; }
.progress-30 { width: 30%; }
.progress-40 { width: 40%; }
.progress-50 { width: 50%; }
.progress-60 { width: 60%; }
.progress-70 { width: 70%; }
.progress-80 { width: 80%; }
.progress-90 { width: 90%; }
.progress-100 { width: 100%; }

.progress-text {
  font-size: 0.85rem;
  color: var(--text-light);
}

.course-actions {
  display: flex;
  gap: 10px;
  margin-top: 15px;
}

.course-btn {
  display: inline-block;
  padding: 10px 20px;
  background: linear-gradient(135deg, var(--sakura-pink), var(--mint-green));
  color: white;
  border-radius: 20px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
}

.course-btn:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(255, 183, 197, 0.4);
}

.course-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  background: #ccc;
}

.course-btn-secondary {
  display: inline-block;
  padding: 10px 20px;
  background: var(--bg-card);
  color: var(--sakura-dark);
  border: 1px solid var(--sakura-pink);
  border-radius: 20px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.3s ease;
}

.course-btn-secondary:hover {
  background: rgba(255, 183, 197, 0.1);
}

.course-btn-pdf {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 10px 20px;
  background: rgba(152, 216, 200, 0.2);
  color: var(--mint-dark);
  border: 1px solid var(--mint-green);
  border-radius: 20px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.3s ease;
}

.course-btn-pdf:hover {
  background: rgba(152, 216, 200, 0.4);
}

.course-btn-pdf.disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.course-btn-delete {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 10px 20px;
  background: rgba(255, 107, 107, 0.1);
  color: #ff6b6b;
  border: 1px solid #ff6b6b;
  border-radius: 20px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.3s ease;
  cursor: pointer;
}

.course-btn-delete:hover {
  background: rgba(255, 107, 107, 0.2);
}

/* 课程详情模态框 */
.modal-content-lg {
  max-width: 700px;
  max-height: 90vh;
  overflow-y: auto;
}

.course-detail-content {
  padding: 10px 0;
}

.detail-section {
  margin-bottom: 25px;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(255, 183, 197, 0.3);
}

.detail-section:last-child {
  border-bottom: none;
  margin-bottom: 0;
}

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

.detail-section-header h4 {
  font-size: 1.1rem;
  color: var(--text-dark);
}

.detail-edit-btn,
.detail-add-btn {
  padding: 5px 12px;
  border: 1px solid var(--sakura-pink);
  border-radius: 15px;
  background: transparent;
  color: var(--sakura-pink);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.detail-edit-btn:hover,
.detail-add-btn:hover {
  background: var(--sakura-pink);
  color: white;
}

.detail-intro-view {
  padding: 15px;
  background: rgba(255, 183, 197, 0.1);
  border-radius: 10px;
  color: var(--text-dark);
  line-height: 1.6;
}

.detail-intro-edit textarea {
  width: 100%;
  padding: 12px;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  font-family: inherit;
  font-size: 0.95rem;
  resize: vertical;
  box-sizing: border-box;
}

.detail-edit-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 10px;
}

/* 详情标签页 */
.detail-tabs {
  display: flex;
  gap: 10px;
  margin-bottom: 15px;
}

.detail-tab {
  padding: 8px 16px;
  border: 1px solid var(--mint-green);
  border-radius: 20px;
  background: transparent;
  color: var(--mint-dark);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.detail-tab:hover,
.detail-tab.active {
  background: var(--mint-green);
  color: white;
}

.detail-panel {
  background: var(--bg-card);
  border-radius: 10px;
  padding: 15px;
}

.detail-notes-textarea {
  width: 100%;
  min-height: 200px;
  padding: 15px;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  font-family: inherit;
  font-size: 0.95rem;
  line-height: 1.6;
  resize: vertical;
  box-sizing: border-box;
}

.detail-notes-actions {
  display: flex;
  justify-content: flex-end;
  margin-top: 10px;
}

/* 文件列表 */
.detail-files-upload {
  margin-bottom: 15px;
}

.upload-hint {
  font-size: 0.9rem;
  color: var(--text-light);
  margin-bottom: 8px;
}

.github-folder-path {
  padding: 10px;
  background: rgba(255, 183, 197, 0.1);
  border-radius: 8px;
  font-size: 0.9rem;
  word-break: break-all;
}

.github-folder-path a {
  color: var(--sakura-pink);
  text-decoration: none;
}

.github-folder-path a:hover {
  text-decoration: underline;
}

.detail-files-empty {
  text-align: center;
  padding: 30px;
  color: var(--text-light);
}

.detail-file-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px;
  border-bottom: 1px solid var(--border-color);
}

.detail-file-item:last-child {
  border-bottom: none;
}

.detail-file-item .file-icon {
  font-size: 1.2rem;
}

.detail-file-item .file-name {
  flex: 1;
}

/* 作业列表 */
.detail-homework-empty {
  text-align: center;
  padding: 30px;
  color: var(--text-light);
}

.detail-homework-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px;
  border-bottom: 1px solid var(--border-color);
  transition: all 0.2s ease;
}

.detail-homework-item:last-child {
  border-bottom: none;
}

.detail-homework-item:hover {
  background: rgba(0, 0, 0, 0.02);
}

.detail-homework-item.completed {
  opacity: 0.6;
}

.detail-homework-item.completed .detail-hw-title {
  text-decoration: line-through;
}

.detail-hw-checkbox {
  position: relative;
  display: flex;
  align-items: center;
  cursor: pointer;
}

.detail-hw-checkbox input {
  width: 18px;
  height: 18px;
  accent-color: var(--sakura-pink);
  appearance: none;
  cursor: pointer;
}

.detail-hw-checkbox .checkmark {
  display: none;
}

.detail-hw-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.detail-hw-title {
  font-size: 0.95rem;
  color: var(--text-dark);
}

.detail-hw-date {
  font-size: 0.8rem;
  color: var(--text-light);
}

.detail-hw-delete {
  background: none;
  border: none;
  font-size: 1.2rem;
  color: var(--text-light);
  cursor: pointer;
  padding: 5px;
}

.detail-hw-delete:hover {
  color: #ff6b6b;
}

.course-status.upcoming {
  background: rgba(150, 150, 150, 0.3);
  color: #888888;
}

.notes-course-selector {
  display: flex;
  align-items: center;
  gap: 10px;
}

.notes-course-selector label {
  font-size: 0.9rem;
  color: var(--text-dark);
  font-weight: 500;
}

.course-select {
  padding: 8px 16px;
  border: 1px solid var(--sakura-pink);
  border-radius: 20px;
  background: var(--bg-card);
  color: var(--text-dark);
  font-size: 0.9rem;
  outline: none;
  cursor: pointer;
}

.course-select:focus {
  border-color: var(--sakura-dark);
}

/* ===== 作业页面 ===== */
.homework-section {
  background: rgba(255, 255, 255, 0.85);
}

.homework-course-tabs {
  display: flex;
  gap: 10px;
  margin-bottom: 30px;
  flex-wrap: wrap;
}

.course-tab {
  padding: 10px 20px;
  background: var(--bg-card);
  border: 1px solid var(--sakura-pink);
  border-radius: 20px;
  color: var(--sakura-dark);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
}

.course-tab:hover:not(:disabled) {
  background: rgba(255, 183, 197, 0.1);
}

.course-tab.active {
  background: var(--sakura-pink);
  color: white;
}

.course-tab:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.homework-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

/* 作业状态筛选 */
.homework-status-filters {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.homework-status-filters .filter-btn {
  padding: 8px 16px;
  border: 1px solid var(--mint-green);
  border-radius: 20px;
  background: transparent;
  color: var(--mint-dark);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.homework-status-filters .filter-btn:hover,
.homework-status-filters .filter-btn.active {
  background: var(--mint-green);
  color: white;
}

/* 作业统计 */
.homework-stats {
  margin-bottom: 20px;
  padding: 10px 15px;
  background: rgba(255, 183, 197, 0.1);
  border-radius: 10px;
  font-size: 0.9rem;
  color: var(--text-light);
}

/* 作业倒计时 */
.homework-countdown {
  font-size: 0.85rem;
  color: var(--sakura-dark);
  margin-bottom: 10px;
  padding: 5px 10px;
  background: rgba(255, 183, 197, 0.15);
  border-radius: 5px;
  display: inline-block;
}

.homework-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 25px;
  box-shadow: var(--shadow-soft);
  transition: all 0.3s ease;
  border-left: 4px solid var(--sakura-pink);
}

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

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

.homework-date {
  font-size: 0.8rem;
  color: var(--text-light);
}

.homework-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 10px;
}

.homework-card > p {
  font-size: 0.9rem;
  color: var(--text-light);
  margin-bottom: 15px;
  line-height: 1.6;
}

.homework-meta {
  margin-bottom: 15px;
}

.homework-module {
  font-size: 0.8rem;
  padding: 4px 12px;
  background: rgba(255, 183, 197, 0.2);
  color: var(--sakura-dark);
  border-radius: 12px;
}

.homework-card .homework-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--sakura-dark);
  font-weight: 500;
  font-size: 0.9rem;
  transition: all 0.3s ease;
}

.homework-card .homework-link:hover {
  color: var(--mint-dark);
}

.homework-empty, .todo-empty, .detail-homework-empty, .detail-files-empty {
  text-align: center;
  padding: 50px 20px;
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  border: 2px dashed var(--border-color);
}

.empty-icon {
  font-size: 3.5rem;
  display: block;
  margin-bottom: 15px;
  opacity: 0.8;
}

.empty-title {
  font-size: 1.2rem;
  color: var(--text-dark);
  margin-bottom: 8px;
  font-weight: 500;
}

.homework-empty p, .todo-empty p {
  color: var(--text-light);
  font-size: 0.95rem;
  margin-bottom: 15px;
}

.empty-hint {
  color: var(--text-light);
  font-size: 0.85rem;
  margin-top: 10px;
}

.homework-add-section {
  margin-top: 20px;
  text-align: center;
}

.homework-checkbox {
  position: relative;
  display: flex;
  align-items: center;
  margin-right: 10px;
}

.homework-checkbox input {
  position: absolute;
  opacity: 0;
  cursor: pointer;
  height: 0;
  width: 0;
}

.homework-checkbox .checkmark {
  width: 22px;
  height: 22px;
  border: 2px solid var(--mint-green);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}

.homework-checkbox input:checked ~ .checkmark {
  background: var(--mint-green);
}

.homework-checkbox input:checked ~ .checkmark::after {
  content: '✓';
  color: white;
  font-size: 14px;
}

.homework-card .homework-header {
  display: flex;
  align-items: center;
  gap: 10px;
}

.homework-title {
  font-size: 1.1rem;
  color: var(--text-dark);
  margin: 10px 0;
}

.homework-desc {
  color: var(--text-light);
  font-size: 0.95rem;
  margin-bottom: 10px;
}

.homework-delete-btn {
  background: none;
  border: none;
  color: var(--text-light);
  font-size: 0.9rem;
  cursor: pointer;
  padding: 5px 10px;
  border-radius: 5px;
  transition: all 0.2s ease;
}

.homework-delete-btn:hover {
  background: rgba(255, 107, 107, 0.1);
  color: #ff6b6b;
}

.homework-tag-btn {
  background: none;
  border: none;
  font-size: 0.9rem;
  padding: 4px 8px;
  cursor: pointer;
  color: var(--text-light);
  transition: all 0.2s ease;
}

.homework-tag-btn:hover {
  background: rgba(255, 183, 197, 0.2);
  color: var(--sakura-pink);
}

.homework-card.completed .homework-title {
  text-decoration: line-through;
  opacity: 0.6;
}

.homework-status.overdue {
  color: #ff6b6b;
}

.homework-status.today {
  color: #ffa500;
}

.homework-status.soon {
  color: #ff9800;
}

/* ===== 帮助页面 ===== */
.help-section {
  background: transparent;
}

.help-content {
  max-width: 800px;
  margin: 0 auto;
}

.help-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 30px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-soft);
}

.help-card h3 {
  font-size: 1.2rem;
  color: var(--sakura-dark);
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid rgba(255, 183, 197, 0.3);
}

.help-card p {
  color: var(--text-light);
  line-height: 1.8;
  margin-bottom: 15px;
}

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

.help-list li {
  padding: 10px 0;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  color: var(--text-light);
}

.help-list li:last-child {
  border-bottom: none;
}

.help-list strong {
  color: var(--text-dark);
}

.help-list-styled {
  line-height: 1.8;
  padding-left: 20px;
}

.help-list-styled li {
  padding: 8px 0;
  color: var(--text-light);
}

.help-text-muted {
  color: #666;
}

.help-text-danger {
  color: #e74c3c;
}

.help-text-warning {
  color: #f39c12;
}

.help-text-info {
  color: #f1c40f;
}

.help-settings-section {
  margin-top: 12px;
}

.help-settings-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 12px;
}

.help-settings-hint {
  margin-top: 10px;
  font-size: 0.85rem;
  color: var(--text-light);
}

.help-settings-status {
  margin-top: 8px;
}

.help-form-group {
  margin-top: 12px;
}

.help-form-label {
  display: block;
  margin-bottom: 6px;
}

.help-form-input {
  width: 100%;
  padding: 8px;
  border: 1px solid #ddd;
  border-radius: 6px;
  box-sizing: border-box;
}

.help-form-small {
  color: #888;
  display: block;
  margin-top: 4px;
}

.help-btn-with-margin {
  margin-top: 10px;
}

.help-btn-left-margin {
  margin-left: 8px;
}

.help-preview-img {
  max-width: 200px;
  max-height: 120px;
  border-radius: 8px;
  border: 2px solid var(--sakura-pink);
}

.help-file-hidden {
  display: none;
}

.help-cursor-pointer {
  cursor: pointer;
}

.help-shortcuts {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.shortcut-item {
  display: flex;
  gap: 15px;
  padding: 15px;
  background: rgba(255, 183, 197, 0.1);
  border-radius: var(--radius-sm);
}

.shortcut-key {
  font-weight: 600;
  color: var(--sakura-dark);
  min-width: 100px;
}

.shortcut-desc {
  color: var(--text-light);
  font-size: 0.95rem;
}

.markdown-help {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 10px;
}

.md-example {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 10px;
  background: rgba(0, 0, 0, 0.02);
  border-radius: var(--radius-sm);
}

.md-example code {
  font-family: monospace;
  font-size: 0.85rem;
  color: var(--text-dark);
  background: rgba(0, 0, 0, 0.05);
  padding: 3px 8px;
  border-radius: 4px;
}

.md-example span {
  font-size: 0.9rem;
  color: var(--text-light);
}

.faq-item {
  padding: 15px 0;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.faq-item:last-child {
  border-bottom: none;
}

.faq-item h4 {
  font-size: 1rem;
  color: var(--text-dark);
  margin-bottom: 8px;
}

.faq-item p {
  margin-bottom: 0;
}

.help-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--text-dark);
  color: white;
  border-radius: 20px;
  font-weight: 500;
  transition: all 0.3s ease;
}

.help-link:hover {
  background: var(--sakura-dark);
  transform: translateY(-2px);
}

/* ===== PDF 占位页面 ===== */
.pdf-placeholder-section {
  min-height: calc(100vh - 60px);
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.85);
}

.pdf-placeholder-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  padding: 60px;
  max-width: 500px;
  margin: 0 auto;
  text-align: center;
}

.pdf-placeholder-card .placeholder-icon {
  font-size: 5rem;
  display: block;
  margin-bottom: 20px;
}

.pdf-placeholder-card h1 {
  font-size: 1.8rem;
  color: var(--text-dark);
  margin-bottom: 10px;
}

.pdf-placeholder-card p {
  color: var(--text-light);
  font-size: 1rem;
  margin-bottom: 30px;
}

.placeholder-actions {
  display: flex;
  flex-direction: column;
  gap: 15px;
  align-items: center;
}

.placeholder-btn {
  display: inline-block;
  padding: 12px 30px;
  background: linear-gradient(135deg, var(--sakura-pink), var(--mint-green));
  color: white;
  border-radius: 25px;
  font-weight: 500;
  transition: all 0.3s ease;
}

.placeholder-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 20px rgba(255, 183, 197, 0.4);
}

.placeholder-btn-secondary {
  display: inline-block;
  padding: 12px 30px;
  background: var(--bg-card);
  color: var(--sakura-dark);
  border: 1px solid var(--sakura-pink);
  border-radius: 25px;
  font-weight: 500;
  transition: all 0.3s ease;
}

.placeholder-btn-secondary:hover {
  background: rgba(255, 183, 197, 0.1);
}

/* ===== 课程列表区 ===== */
.courses-section {
  background: rgba(255, 255, 255, 0.75);
}

.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.course-card {
  display: block;
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 25px 20px;
  text-align: center;
  box-shadow: var(--shadow-soft);
  transition: all 0.3s ease;
  border: 2px solid transparent;
}

.course-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
  border-color: var(--sakura-pink);
}

.course-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
}

.course-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 5px;
}

.course-meta {
  font-size: 0.8rem;
  color: var(--sakura-dark);
  font-weight: 500;
  margin-bottom: 8px;
}

.course-desc {
  font-size: 0.85rem;
  color: var(--text-light);
  line-height: 1.5;
  margin-bottom: 12px;
  max-height: 3em;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
}

.course-goals {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 12px;
}

.course-goals span {
  font-size: 0.75rem;
  padding: 4px 10px;
  background: rgba(255, 183, 197, 0.2);
  color: var(--text-light);
  border-radius: 12px;
}

.course-status {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
}

.course-status.in-progress {
  background: rgba(152, 216, 200, 0.3);
  color: #2a9d8f;
}

.course-status.pending {
  background: rgba(255, 183, 197, 0.3);
  color: #c77d8e;
}

.course-status.optional {
  background: rgba(200, 200, 200, 0.3);
  color: #888888;
}

/* ===== 模块详情页 ===== */
.module-detail-section {
  min-height: calc(100vh - 60px);
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.75);
}

.module-detail-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  padding: 50px;
  max-width: 800px;
  margin: 0 auto;
}

.module-header {
  display: flex;
  align-items: center;
  gap: 25px;
  margin-bottom: 40px;
  padding-bottom: 30px;
  border-bottom: 2px solid rgba(255, 183, 197, 0.3);
}

.module-icon {
  font-size: 4rem;
}

.module-title {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 8px;
}

.module-meta {
  font-size: 1rem;
  color: var(--sakura-dark);
  font-weight: 500;
}

.module-content h2 {
  font-size: 1.2rem;
  color: var(--text-dark);
  margin: 30px 0 15px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.module-content h2:first-child {
  margin-top: 0;
}

.module-content p {
  color: var(--text-light);
  line-height: 1.8;
  margin-bottom: 15px;
}

.module-goals-list {
  list-style: disc;
  padding-left: 25px;
  color: var(--text-light);
}

.module-goals-list li {
  margin-bottom: 10px;
  line-height: 1.6;
}

.module-topics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 15px;
}

.topic-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 20px;
  background: linear-gradient(135deg, rgba(255, 183, 197, 0.15), rgba(152, 216, 200, 0.15));
  border-radius: var(--radius-sm);
}

.topic-icon {
  font-size: 1.5rem;
}

.topic-name {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-dark);
}

.module-back {
  margin-top: 40px;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 183, 197, 0.3);
  text-align: center;
}

.back-link {
  display: inline-block;
  padding: 12px 30px;
  background: var(--text-dark);
  color: white;
  border-radius: 25px;
  font-weight: 500;
  transition: all 0.3s ease;
}

.back-link:hover {
  background: var(--sakura-dark);
  transform: translateY(-2px);
}

/* ===== 每页背景管理 ===== */
.help-page-bg-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px;
}

.page-bg-item {
  display: flex;
  flex-direction: column;
  padding: 12px 15px;
  background: rgba(255, 183, 197, 0.08);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  transition: all 0.2s;
}

.page-bg-item.current {
  background: rgba(255, 183, 197, 0.2);
  border-color: var(--sakura-pink);
}

.page-bg-name {
  font-weight: 500;
  color: var(--text-dark);
  font-size: 0.95rem;
}

.page-bg-status {
  font-size: 0.8rem;
  color: var(--text-light);
  margin-top: 4px;
}

.page-bg-item:hover {
  background: rgba(255, 183, 197, 0.15);
  cursor: pointer;
}

/* ===== 背景图选择器 ===== */
.bg-page-selector {
  margin-bottom: 15px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.bg-page-label {
  font-weight: 500;
  color: var(--text-dark);
  white-space: nowrap;
}

.bg-page-select {
  flex: 1;
  padding: 10px 15px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  color: var(--text-dark);
  font-size: 0.95rem;
  cursor: pointer;
}

.bg-page-select:focus {
  outline: none;
  border-color: var(--sakura-pink);
}

.bg-current-preview {
  margin-bottom: 15px;
  padding: 15px;
  background: rgba(255, 183, 197, 0.05);
  border-radius: var(--radius-sm);
  border: 1px dashed var(--border-color);
}

/* ===== 作业展示区 ===== */
.homeworks-section {
  background: rgba(255, 255, 255, 0.75);
}

.homeworks-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 25px;
}

.homework-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 30px;
  box-shadow: var(--shadow-soft);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.homework-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--sakura-pink), var(--mint-green));
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.homework-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

.homework-card:hover::before {
  transform: scaleX(1);
}

.homework-status {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 15px;
  font-size: 0.8rem;
  font-weight: 500;
  margin-bottom: 15px;
}

.homework-status.completed {
  background: rgba(152, 216, 200, 0.3);
  color: #2a9d8f;
}

.homework-status.pending {
  background: rgba(255, 183, 197, 0.3);
  color: #c77d8e;
}

.homework-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 10px;
}

.homework-card p {
  font-size: 0.9rem;
  color: var(--text-light);
  margin-bottom: 20px;
}

.homework-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--sakura-dark);
  font-weight: 500;
  font-size: 0.95rem;
  transition: all 0.3s ease;
}

.homework-link:hover {
  color: var(--mint-dark);
  gap: 10px;
}

/* ===== PDF 阅读区 ===== */
.pdf-section {
  background: rgba(255, 255, 255, 0.85);
}

.pdf-container {
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
  padding: 0;
}

.pdf-view-card {
  text-align: center;
  padding: 60px 40px;
}

.pdf-icon {
  font-size: 5rem;
  margin-bottom: 20px;
}

.pdf-view-card h3 {
  font-size: 1.3rem;
  color: var(--text-dark);
  margin-bottom: 10px;
}

.pdf-view-card p {
  color: var(--text-light);
  margin-bottom: 25px;
}

.pdf-open-btn {
  display: inline-block;
  padding: 14px 30px;
  background: linear-gradient(135deg, var(--sakura-pink), var(--mint-green));
  color: white;
  border-radius: 30px;
  font-weight: 500;
  font-size: 1rem;
  transition: all 0.3s ease;
}

.pdf-open-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(255, 183, 197, 0.4);
}

/* ===== 课程笔记区 ===== */
.notes-section {
  background: rgba(255, 255, 255, 0.85);
}

.notes-container {
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  overflow: visible;
}

.notes-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 20px;
  background: linear-gradient(135deg, rgba(255, 183, 197, 0.2), rgba(152, 216, 200, 0.2));
  border-bottom: 1px solid rgba(255, 183, 197, 0.3);
  flex-wrap: wrap;
  gap: 10px;
}

/* 笔记标签 */
.notes-tags-section {
  margin-bottom: 20px;
  padding: 15px 20px;
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
}

.tags-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.tags-label {
  font-weight: 500;
  color: var(--text-dark);
}

.tags-add-btn {
  padding: 5px 12px;
  border: 1px solid var(--sakura-pink);
  border-radius: 15px;
  background: transparent;
  color: var(--sakura-pink);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.tags-add-btn:hover {
  background: var(--sakura-pink);
  color: white;
}

.tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tags-empty {
  color: var(--text-light);
  font-size: 0.9rem;
}

.tag-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border: 1px solid;
  border-radius: 15px;
  font-size: 0.85rem;
  transition: all 0.2s ease;
}

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

.tag-name {
  color: var(--text-dark);
}

.tag-delete {
  background: none;
  border: none;
  font-size: 1rem;
  color: var(--text-light);
  cursor: pointer;
  padding: 0;
  line-height: 1;
}

.tag-delete:hover {
  color: #ff6b6b;
}

.tag-selected {
  box-shadow: 0 0 0 2px var(--sakura-pink);
}

.tag-clear-btn {
  margin-left: 10px;
  text-decoration: underline;
}

.tag-clear-btn:hover {
  color: var(--sakura-pink);
}

.file-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 4px;
}

.file-tag {
  font-size: 0.7rem;
  padding: 1px 6px;
  border-radius: 10px;
  border: 1px solid;
}

.tag-toggle-item:hover {
  background: rgba(255, 183, 197, 0.1);
}

.notes-tabs {
  display: flex;
  gap: 10px;
}

.notes-tab {
  padding: 8px 20px;
  background: var(--bg-card);
  border: 1px solid var(--sakura-pink);
  border-radius: 20px;
  color: var(--sakura-dark);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
}

.notes-tab:hover {
  background: rgba(255, 183, 197, 0.2);
}

.notes-tab.active {
  background: var(--sakura-pink);
  color: white;
}

.notes-actions {
  display: flex;
  gap: 10px;
}

.notes-btn {
  padding: 8px 16px;
  background: var(--bg-card);
  border: 1px solid var(--sakura-pink);
  border-radius: 20px;
  color: var(--sakura-dark);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
}

.notes-btn:hover {
  background: var(--sakura-pink);
  color: white;
}

.notes-btn-clear {
  border-color: #e8a0b0;
  color: #c77d8e;
}

.notes-btn-clear:hover {
  background: #c77d8e;
  color: white;
}

.notes-content {
  min-height: 400px;
}

.notes-editor {
  height: 100%;
}

.notes-editor-hidden {
  display: none;
}

.notes-textarea {
  width: 100%;
  min-height: 400px;
  padding: 25px;
  border: none;
  outline: none;
  font-family: 'Microsoft YaHei', 'Noto Sans JP', monospace;
  font-size: 0.95rem;
  line-height: 1.8;
  resize: vertical;
  background: var(--bg-card);
  color: var(--text-dark);
}

.notes-textarea::placeholder {
  color: var(--text-light);
  opacity: 0.7;
}

.notes-preview {
  padding: 25px;
  min-height: 400px;
  background: var(--bg-card);
  overflow-x: visible;
}

.notes-preview-hidden {
  display: none;
}

/* Markdown 渲染样式 */
.markdown-body {
  color: var(--text-dark);
  line-height: 1.8;
}

.markdown-body h1 {
  font-size: 1.8rem;
  margin: 0 0 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--sakura-pink);
}

.markdown-body h2 {
  font-size: 1.4rem;
  margin: 25px 0 15px;
  color: var(--sakura-dark);
}

.markdown-body h3 {
  font-size: 1.15rem;
  margin: 20px 0 10px;
}

.markdown-body p {
  margin: 0 0 15px;
}

.markdown-body ul,
.markdown-body ol {
  margin: 0 0 15px;
  padding-left: 25px;
}

.markdown-body li {
  margin-bottom: 8px;
}

.markdown-body blockquote {
  margin: 15px 0;
  padding: 15px 20px;
  background: rgba(255, 183, 197, 0.15);
  border-left: 4px solid var(--sakura-pink);
  color: var(--text-light);
}

.markdown-body code {
  padding: 2px 6px;
  background: rgba(0, 0, 0, 0.05);
  border-radius: 4px;
  font-family: monospace;
  font-size: 0.9em;
}

.markdown-body pre {
  margin: 15px 0;
  padding: 15px;
  background: rgba(0, 0, 0, 0.05);
  border-radius: var(--radius-sm);
  overflow-x: auto;
}

.markdown-body pre code {
  padding: 0;
  background: none;
}

.markdown-body a {
  color: var(--sakura-dark);
  text-decoration: underline;
}

.markdown-body a:hover {
  color: var(--mint-dark);
}

.markdown-body strong {
  font-weight: 600;
}

.markdown-body em {
  font-style: italic;
}

.markdown-body hr {
  margin: 25px 0;
  border: none;
  border-top: 1px solid rgba(255, 183, 197, 0.3);
}

/* Markdown 表格样式 */
.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 15px 0;
}

.markdown-body table th,
.markdown-body table td {
  border: 1px solid var(--border-color);
  padding: 10px 14px;
  text-align: left;
}

.markdown-body table th {
  background: rgba(255, 183, 197, 0.2);
  font-weight: 600;
}

.markdown-body table tr:nth-child(even) {
  background: rgba(0, 0, 0, 0.02);
}

.markdown-body table tr:hover {
  background: rgba(255, 183, 197, 0.08);
}

/* KaTeX 公式样式 */
.markdown-body .katex {
  font-size: 1.1em;
}

.markdown-body .katex-display {
  margin: 15px 0;
  padding: 10px;
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  text-align: center;
  /* 确保容器不会被父元素截断 */
  isolation: isolate;
}

.markdown-body .katex-display > .katex {
  display: inline-block;
  text-align: center;
  /* 确保 KaTeX 不会让容器溢出 */
  max-width: 100%;
}

/* 确保公式本身不换行，超出时滚动 */
.markdown-body .katex {
  white-space: nowrap;
}

.markdown-body .katex-display .katex-html {
  display: inline-block;
  max-width: 100%;
  overflow-x: auto;
}

.notes-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 20px;
  background: rgba(0, 0, 0, 0.02);
  border-top: 1px solid rgba(255, 183, 197, 0.2);
  font-size: 0.85rem;
}

.notes-status {
  color: var(--mint-dark);
  font-weight: 500;
}

.notes-hint {
  color: var(--text-light);
}

/* ===== 模态框 ===== */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  justify-content: center;
  align-items: center;
}

.modal-content {
  background: var(--bg-card);
  border-radius: 20px;
  padding: 30px;
  max-width: 500px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

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

.modal-header h3 {
  font-size: 1.3rem;
  color: var(--text-dark);
  margin: 0;
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-light);
  cursor: pointer;
  padding: 0;
  line-height: 1;
}

.modal-close:hover {
  color: var(--sakura-pink);
}

.modal-form .form-group {
  margin-bottom: 15px;
}

.modal-form label {
  display: block;
  font-size: 0.9rem;
  color: var(--text-dark);
  margin-bottom: 5px;
  font-weight: 500;
}

.modal-form input,
.modal-form select,
.modal-form textarea {
  width: 100%;
  padding: 10px 15px;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  font-size: 1rem;
  font-family: inherit;
  background: var(--bg-main);
  color: var(--text-dark);
  transition: border-color 0.3s ease;
  box-sizing: border-box;
}

.modal-form input:focus,
.modal-form select:focus,
.modal-form textarea:focus {
  outline: none;
  border-color: var(--sakura-pink);
}

.modal-form textarea {
  resize: vertical;
  min-height: 80px;
}

.form-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 20px;
}

.avatar-edit-container {
  display: flex;
  align-items: center;
  gap: 15px;
}

.avatar-preview {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: rgba(255, 183, 197, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  overflow: hidden;
}

/* ===== 页脚 ===== */
.footer {
  background: transparent;
  padding: 40px 0;
  text-align: center;
  border-top: 1px solid rgba(255, 183, 197, 0.3);
}

.footer p {
  font-size: 0.95rem;
  color: var(--text-light);
}

.footer-note {
  font-size: 0.85rem;
  color: var(--sakura-dark);
  margin-top: 5px;
  font-style: italic;
}

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
  .nav-links {
    gap: 20px;
  }

  .about-card {
    flex-direction: column;
    text-align: center;
    padding: 40px 30px;
    gap: 30px;
  }

  .name {
    font-size: 1.6rem;
  }

  .section {
    padding: 60px 0;
  }

  .section-title {
    font-size: 1.5rem;
  }

  .courses-grid,
  .homeworks-grid {
    grid-template-columns: 1fr;
  }

  /* 课程表移动端优化 */
  .table-wrapper {
    overflow-x: auto;
  }

  .course-table {
    min-width: 700px;
  }

  .week-selector {
    flex-wrap: wrap;
    gap: 10px;
  }

  .week-select {
    min-width: 150px;
  }
}

@media (max-width: 480px) {
  .nav-content {
    padding: 0 15px;
  }

  .nav-logo {
    font-size: 1.1rem;
  }

  .nav-links {
    gap: 15px;
  }

  .nav-links a {
    font-size: 0.85rem;
  }

  .about-card {
    padding: 30px 20px;
  }

  .avatar {
    width: 110px;
    height: 110px;
    font-size: 45px;
  }

  .name {
    font-size: 1.4rem;
  }

  .bio {
    font-size: 0.95rem;
  }

  .github-link {
    padding: 10px 20px;
    font-size: 0.9rem;
  }
}

/* ===== 待办事项 ===== */
.todo-add-form {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 20px;
  padding: 20px;
  background: var(--bg-card);
  border-radius: 15px;
}

.todo-input {
  flex: 1;
  min-width: 200px;
  padding: 12px 15px;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  font-size: 1rem;
  font-family: inherit;
  background: var(--bg-main);
  color: var(--text-dark);
}

.todo-input:focus {
  outline: none;
  border-color: var(--sakura-pink);
}

.todo-date-input,
.todo-course-select {
  padding: 12px 15px;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  font-size: 1rem;
  font-family: inherit;
  background: var(--bg-main);
  color: var(--text-dark);
}

.todo-date-input {
  min-width: 150px;
}

.todo-course-select {
  min-width: 180px;
}

.todo-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 20px;
}

.filter-btn {
  padding: 8px 16px;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  background: var(--bg-card);
  color: var(--text-dark);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.3s ease;
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--sakura-pink);
  border-color: var(--sakura-pink);
  color: white;
}

.todo-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.todo-empty {
  text-align: center;
  padding: 40px;
  color: var(--text-light);
  font-size: 1.1rem;
}

.todo-item {
  display: flex;
  align-items: center;
  gap: 15px;
  padding: 15px 20px;
  background: var(--bg-card);
  border-radius: 12px;
  transition: all 0.3s ease;
}

.todo-item:hover {
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.todo-item.completed {
  opacity: 0.6;
}

.todo-item.completed .todo-text {
  text-decoration: line-through;
}

.todo-checkbox {
  position: relative;
  display: flex;
  align-items: center;
}

.todo-checkbox input {
  position: absolute;
  opacity: 0;
  cursor: pointer;
  height: 0;
  width: 0;
}

.checkmark {
  width: 24px;
  height: 24px;
  border: 2px solid var(--mint-green);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}

.todo-checkbox input:checked ~ .checkmark {
  background: var(--mint-green);
}

.todo-checkbox input:checked ~ .checkmark::after {
  content: '✓';
  color: white;
  font-size: 14px;
}

.todo-content {
  flex: 1;
}

.todo-text {
  display: block;
  font-size: 1rem;
  color: var(--text-dark);
  margin-bottom: 5px;
}

.todo-meta {
  display: flex;
  gap: 15px;
  flex-wrap: wrap;
}

.todo-date {
  font-size: 0.85rem;
  color: var(--text-light);
}

.todo-date.overdue {
  color: #ff6b6b;
}

.todo-date.today {
  color: #ffa500;
}

.todo-date.soon {
  color: #ff9800;
}

.todo-course {
  font-size: 0.85rem;
  color: var(--text-light);
}

.todo-delete {
  background: none;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  opacity: 0.5;
  transition: opacity 0.2s ease;
}

.todo-delete:hover {
  opacity: 1;
}

/* ===== 课程表 ===== */
.table-wrapper {
  overflow-x: auto;
  background: var(--bg-card);
  border-radius: 15px;
  padding: 20px;
}

.course-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 700px;
}

.course-table th,
.course-table td {
  border: 1px solid var(--border-color);
  padding: 0;
  text-align: center;
}

.course-table th {
  background: var(--sakura-pink);
  color: white;
  font-weight: 500;
  padding: 12px 8px;
}

.time-col,
.time-cell {
  background: rgba(152, 216, 200, 0.2);
  color: var(--mint-dark);
  font-weight: 500;
  width: 80px;
}

.time-cell.clickable {
  cursor: pointer;
  transition: background 0.2s;
}

.time-cell.clickable:hover {
  background: rgba(152, 216, 200, 0.4);
}

.course-cell {
  min-height: 60px;
}

.table-input {
  width: 100%;
  height: 60px;
  padding: 8px;
  border: none;
  background: transparent;
  text-align: center;
  font-size: 0.9rem;
  font-family: inherit;
  color: var(--text-dark);
  box-sizing: border-box;
}

.table-input:focus {
  outline: none;
  background: rgba(255, 183, 197, 0.2);
}

.table-input::placeholder {
  color: var(--text-light);
  opacity: 0.5;
}

/* ===== 日程页面样式 ===== */
.schedule-section {
  padding: 40px 0;
}

.table-section {
  padding: 40px 0;
}

/* 每周导航 */
.week-selector {
  display: flex;
  align-items: center;
  gap: 15px;
  flex-wrap: wrap;
  margin-bottom: 20px;
  padding: 15px 20px;
  background: var(--bg-card);
  border-radius: 12px;
  box-shadow: var(--shadow-soft);
}

.week-nav-btn {
  padding: 8px 16px;
  border: 1px solid var(--sakura-pink);
  border-radius: 20px;
  background: transparent;
  color: var(--sakura-pink);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.week-nav-btn:hover {
  background: var(--sakura-pink);
  color: white;
}

.week-select {
  padding: 8px 16px;
  border: 1px solid var(--sakura-pink);
  border-radius: 20px;
  background: white;
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--text-dark);
  cursor: pointer;
}

.week-date-range {
  font-size: 0.95rem;
  color: var(--text-light);
}

/* 单双周选择 */
.week-type-selector {
  display: flex;
  gap: 15px;
  margin-bottom: 20px;
  padding: 12px 20px;
  background: var(--bg-card);
  border-radius: 12px;
  box-shadow: var(--shadow-soft);
}

.week-type-selector label {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  font-size: 0.95rem;
  color: var(--text-dark);
}

.week-type-selector input[type="radio"] {
  accent-color: var(--sakura-pink);
}

/* 学期进度条 */
.semester-progress {
  margin-bottom: 20px;
  padding: 15px 20px;
  background: var(--bg-card);
  border-radius: 12px;
  box-shadow: var(--shadow-soft);
}

.progress-info {
  display: flex;
  align-items: center;
  gap: 15px;
  margin-bottom: 10px;
}

.progress-label {
  font-weight: 500;
  color: var(--text-dark);
}

.progress-text {
  flex: 1;
  font-size: 0.9rem;
  color: var(--text-light);
}

.progress-settings-btn {
  padding: 5px 12px;
  border: 1px solid var(--mint-green);
  border-radius: 15px;
  background: transparent;
  color: var(--mint-dark);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.progress-settings-btn:hover {
  background: var(--mint-green);
  color: white;
}

.progress-bar {
  height: 8px;
  background: rgba(255, 183, 197, 0.3);
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--sakura-pink), var(--sakura-dark));
  border-radius: 4px;
  transition: width 0.3s ease;
}

/* 本周概览 */
.week-overview {
  margin-bottom: 20px;
  padding: 20px;
  background: var(--bg-card);
  border-radius: 12px;
  box-shadow: var(--shadow-soft);
}

.overview-title {
  font-size: 1.1rem;
  color: var(--text-dark);
  margin-bottom: 15px;
}

.overview-empty {
  text-align: center;
  padding: 20px;
  color: var(--text-light);
  font-size: 0.95rem;
}

.overview-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 15px;
}

.overview-day {
  background: rgba(255, 183, 197, 0.1);
  border-radius: 10px;
  padding: 12px;
}

.overview-day-name {
  font-weight: 500;
  color: var(--sakura-dark);
  margin-bottom: 8px;
}

.overview-day-courses {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.overview-course-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.overview-period {
  font-size: 0.8rem;
  color: var(--mint-dark);
}

.overview-name {
  font-size: 0.9rem;
  color: var(--text-dark);
}

.overview-location {
  font-size: 0.75rem;
  color: var(--text-light);
}

/* 课程表时间列 */
.period-name {
  font-weight: 500;
  color: var(--mint-dark);
  font-size: 0.9rem;
}

.period-time {
  font-size: 0.75rem;
  color: var(--text-light);
  margin-top: 2px;
}

/* 课程表课程项 */
.table-course-item {
  position: relative;
  padding: 6px 8px;
  background: linear-gradient(135deg, var(--sakura-pink), var(--sakura-dark));
  border-radius: 8px;
  color: white;
  font-size: 0.8rem;
  text-align: left;
  cursor: default;
  min-height: 50px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.table-course-item.dimmed {
  opacity: 0.4;
}

.table-course-icon {
  font-size: 0.85rem;
}

.table-course-name {
  font-weight: 500;
  line-height: 1.2;
}

.table-course-location,
.table-course-note {
  font-size: 0.7rem;
  opacity: 0.85;
  line-height: 1.2;
}

.table-course-delete {
  position: absolute;
  top: 2px;
  right: 4px;
  width: 18px;
  height: 18px;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  color: white;
  font-size: 12px;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.table-course-item:hover .table-course-delete {
  opacity: 1;
}

.table-course-delete:hover {
  background: rgba(255, 100, 100, 0.7);
}

/* 空单元格 */
.empty-cell {
  cursor: pointer;
  color: var(--text-light);
  font-size: 1.2rem;
  transition: all 0.2s ease;
}

.empty-cell:hover {
  background: rgba(255, 183, 197, 0.2);
  color: var(--sakura-pink);
}

/* 添加课程项区域 */
.table-add-section {
  margin-top: 20px;
  text-align: center;
}

/* ===== 多笔记功能 ===== */
.notes-selector-row {
  width: 100%;
  margin: 8px 0;
}

.notes-list-selector {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.notes-list-selector label {
  font-weight: 500;
  color: var(--text-dark);
  white-space: nowrap;
}

.notes-btn-small {
  padding: 5px 12px;
  font-size: 0.85rem;
}

.notes-btn-link {
  text-decoration: none;
  display: inline-block;
}

.notes-btn-link:hover {
  background: var(--sakura-pink);
  color: white;
}

/* ===== 标签颜色选择器 ===== */
.tag-color-input-row {
  display: flex;
  gap: 10px;
  align-items: center;
}

.tag-color-input-row input[type="color"] {
  width: 50px;
  height: 38px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 2px;
}

.tag-color-input-row input[type="text"] {
  flex: 1;
  padding: 8px 12px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-family: monospace;
}

.form-hint {
  font-size: 0.8rem;
  color: var(--text-light);
  margin-top: 5px;
}

.tag-color-presets {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 10px;
}

.color-preset {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all 0.2s;
}

.color-preset:hover {
  transform: scale(1.1);
  border-color: var(--text-dark);
}

/* ===== 上传文件列表 ===== */
.uploaded-files-section {
  margin-top: 30px;
  padding: 20px;
  background: var(--bg-card);
  border-radius: 15px;
}

.uploaded-files-title {
  font-size: 1.1rem;
  color: var(--text-dark);
  margin-bottom: 15px;
}

.uploaded-files-empty {
  text-align: center;
  padding: 20px;
  color: var(--text-light);
  font-size: 0.95rem;
}

.uploaded-file-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 15px;
  border-bottom: 1px solid var(--border-color);
  transition: background 0.2s ease;
}

.uploaded-file-item:last-child {
  border-bottom: none;
}

.uploaded-file-item:hover {
  background: rgba(0, 0, 0, 0.02);
}

.file-icon {
  font-size: 1.3rem;
}

.file-name {
  flex: 1;
  font-size: 0.95rem;
  color: var(--text-dark);
}

.file-date {
  font-size: 0.85rem;
  color: var(--text-light);
}

.file-action-btn {
  padding: 5px 12px;
  border: 1px solid var(--mint-green);
  border-radius: 15px;
  background: transparent;
  color: var(--mint-dark);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.file-action-btn:hover {
  background: var(--mint-green);
  color: white;
}

.file-delete-btn {
  border-color: #ff6b6b;
  color: #ff6b6b;
}

.file-delete-btn:hover {
  background: #ff6b6b;
  color: white;
}

/* 文件夹相关样式 */
.files-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
}

.folder-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 15px;
  padding-bottom: 15px;
  border-bottom: 1px solid var(--border-color);
}

.folder-btn {
  padding: 6px 14px;
  border: 1px solid var(--sakura-pink);
  border-radius: 20px;
  background: transparent;
  color: var(--sakura-pink);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.folder-btn:hover,
.folder-btn.active {
  background: var(--sakura-pink);
  color: white;
}

.file-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.file-folder-tag {
  font-size: 0.75rem;
  color: var(--text-light);
}

.file-category-tag {
  font-size: 0.7rem;
  color: var(--mint-dark);
  background: rgba(152, 216, 200, 0.2);
  padding: 2px 6px;
  border-radius: 8px;
  margin-left: 5px;
}

.folder-select-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-height: 200px;
  overflow-y: auto;
}

.folder-option {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.folder-option:hover {
  background: rgba(255, 183, 197, 0.1);
  border-color: var(--sakura-pink);
}

.modal-content-sm {
  max-width: 400px;
}

.text-muted {
  color: var(--text-light);
  font-size: 0.9rem;
}

/* ===== PDF 预览模态框 ===== */
.pdf-preview-modal {
  align-items: center;
}

.pdf-preview-content {
  max-width: 900px;
  width: 95%;
  max-height: 95vh;
  display: flex;
  flex-direction: column;
}

.pdf-viewer-container {
  flex: 1;
  overflow: auto;
  background: #525659;
  border-radius: 8px;
  min-height: 400px;
  max-height: 70vh;
  display: flex;
  justify-content: center;
}

.pdf-viewer-container canvas {
  max-width: 100%;
  height: auto !important;
}

.pdf-controls {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 20px;
  padding: 15px 0;
}

.pdf-btn {
  padding: 8px 16px;
  border: 1px solid var(--sakura-pink);
  border-radius: 20px;
  background: transparent;
  color: var(--sakura-pink);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.pdf-btn:hover {
  background: var(--sakura-pink);
  color: white;
}

#pdfPageInfo {
  font-size: 0.95rem;
  color: var(--text-dark);
}

/* ===== 隐藏文件输入 ===== */
.file-input-hidden {
  display: none !important;
}

/* ===== 打印样式 ===== */
@media print {
  .navbar, .footer, .sakura-container, .todo-add-form, .todo-filters,
  .homework-add-section, .homework-status-filters, .homework-course-tabs,
  .week-selector, .week-type-selector, .semester-progress, .week-overview,
  .table-add-section, .notes-actions, .notes-tabs, .notes-tags-section,
  .notes-upload-section, .course-actions, .homework-actions,
  button, .modal, .filter-btn, .course-btn, .course-btn-secondary {
    display: none !important;
  }

  body {
    background: white !important;
    color: black !important;
  }

  .main-content {
    max-width: 100% !important;
    margin: 0 !important;
    padding: 20px !important;
  }

  .section {
    background: white !important;
    box-shadow: none !important;
    border: 1px solid #ddd !important;
    page-break-inside: avoid;
  }

  .help-card, .course-card-main, .homework-card, .todo-item {
    background: white !important;
    border: 1px solid #ddd !important;
    box-shadow: none !important;
  }

  .markdown-body {
    color: black !important;
    font-size: 12pt !important;
    line-height: 1.6 !important;
  }

  .markdown-body h1, .markdown-body h2, .markdown-body h3 {
    color: black !important;
    border-bottom: 1px solid #ddd !important;
  }

  pre, code {
    background: #f5f5f5 !important;
    border: 1px solid #ddd !important;
  }
}

/* ===== 搜索功能 ===== */
.search-btn {
  background: none;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  transition: background 0.2s;
}

.search-btn:hover {
  background: rgba(255, 183, 197, 0.2);
}

.search-input {
  width: 100%;
  padding: 12px 15px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius);
  font-size: 1rem;
  margin-bottom: 15px;
}

.search-input:focus {
  outline: none;
  border-color: var(--sakura-pink);
}

.search-results {
  max-height: 400px;
  overflow-y: auto;
}

.search-result-item {
  padding: 12px 15px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.2s;
  border-bottom: 1px solid var(--border-color);
}

.search-result-item:hover {
  background: rgba(255, 183, 197, 0.1);
}

.search-result-item:last-child {
  border-bottom: none;
}

.search-result-title {
  font-weight: 500;
  color: var(--text-dark);
  margin-bottom: 4px;
}

.search-result-meta {
  font-size: 0.85rem;
  color: var(--text-light);
}

.search-result-content {
  font-size: 0.9rem;
  color: var(--text-light);
  margin-top: 5px;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
}

.search-no-results {
  text-align: center;
  padding: 30px;
  color: var(--text-light);
}

/* ===== 响应式 ===== */