:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border-color: #334155;
  --border-focus: #38bdf8;
  --accent-color: #38bdf8;
  --accent-glow: rgba(56, 189, 248, 0.15);
  --card-bg: #1e293b;
  --card-hover-border: #475569;
  --modal-overlay: rgba(15, 23, 42, 0.75);
  --code-bg: #0b1120;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

body.light-theme {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --border-color: #e2e8f0;
  --border-focus: #0284c7;
  --accent-color: #0284c7;
  --accent-glow: rgba(2, 132, 199, 0.1);
  --card-bg: #ffffff;
  --card-hover-border: #cbd5e1;
  --modal-overlay: rgba(15, 23, 42, 0.45);
  --code-bg: #f1f5f9;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.layout-container {
  max-width: 960px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
}

/* 顶部导航 */
.site-header {
  margin-bottom: 2.5rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 2rem;
}

.brand-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.25rem;
  margin-bottom: 1.75rem;
}

.brand-info {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.avatar-icon {
  font-size: 2.25rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.site-title {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text-primary);
}

.site-subtitle {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: 0.2rem;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.75rem;
  padding: 0.35rem 0.75rem;
  border-radius: 9999px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #10b981;
  box-shadow: 0 0 8px #10b981;
}

.icon-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.1rem;
  transition: var(--transition);
}

.icon-btn:hover {
  border-color: var(--accent-color);
  background: var(--bg-tertiary);
}

/* 搜索与分类控制 */
.controls-row {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.search-box {
  position: relative;
  display: flex;
  align-items: center;
  width: 100%;
}

.search-icon {
  position: absolute;
  left: 0.85rem;
  color: var(--text-muted);
  pointer-events: none;
}

.search-box input {
  width: 100%;
  padding: 0.7rem 2.2rem 0.7rem 2.5rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.95rem;
  outline: none;
  transition: var(--transition);
}

.search-box input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.clear-btn {
  position: absolute;
  right: 0.75rem;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.25rem;
  cursor: pointer;
  line-height: 1;
}

.category-filters {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.25rem;
  scrollbar-width: none;
}

.category-filters::-webkit-scrollbar {
  display: none;
}

.filter-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  transition: var(--transition);
}

.filter-btn:hover {
  color: var(--text-primary);
  border-color: var(--accent-color);
}

.filter-btn.active {
  background: var(--accent-color);
  color: #ffffff;
  border-color: var(--accent-color);
}

/* 内容区 */
.content-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.notes-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.note-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.note-card:hover {
  transform: translateY(-2px);
  border-color: var(--card-hover-border);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.badge {
  font-size: 0.75rem;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  background: var(--bg-tertiary);
  color: var(--accent-color);
  font-weight: 600;
}

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

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.6rem;
  line-height: 1.4;
}

.card-summary {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1rem;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tag-item {
  font-size: 0.75rem;
  color: var(--text-muted);
  background: var(--bg-primary);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  border: 1px solid var(--border-color);
}

/* 空状态 */
.empty-state {
  text-align: center;
  padding: 4rem 1rem;
  color: var(--text-secondary);
}

.empty-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

/* 弹窗阅读器 */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--modal-overlay);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1.25rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  max-width: 760px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  padding: 2.25rem;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
  position: relative;
  transform: translateY(10px);
  transition: transform 0.25s ease;
}

.modal-overlay.open .modal-card {
  transform: translateY(0);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.modal-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

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

.modal-close-btn {
  background: none;
  border: none;
  font-size: 1.8rem;
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1;
  transition: var(--transition);
}

.modal-close-btn:hover {
  color: var(--text-primary);
}

.modal-title {
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.35;
  margin-bottom: 0.85rem;
}

.modal-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.modal-divider {
  border: none;
  height: 1px;
  background: var(--border-color);
  margin-bottom: 1.5rem;
}

.modal-body {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-primary);
}

.modal-body h3 {
  font-size: 1.3rem;
  margin: 1.5rem 0 0.75rem;
  color: var(--text-primary);
}

.modal-body h4 {
  font-size: 1.1rem;
  margin: 1.25rem 0 0.5rem;
  color: var(--text-primary);
}

.modal-body p {
  margin-bottom: 1rem;
  color: var(--text-secondary);
}

.modal-body ul, .modal-body ol {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
  color: var(--text-secondary);
}

.modal-body li {
  margin-bottom: 0.4rem;
}

.modal-body strong {
  color: var(--text-primary);
}

.modal-body blockquote {
  border-left: 4px solid var(--accent-color);
  padding: 0.5rem 1rem;
  background: var(--bg-tertiary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 1rem 0;
  color: var(--text-secondary);
}

.modal-body pre {
  background: var(--code-bg);
  padding: 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  overflow-x: auto;
  margin: 1rem 0;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.88rem;
  line-height: 1.5;
}

.modal-body code {
  background: var(--bg-tertiary);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-family: ui-monospace, SFMono-Regular, monospace;
  font-size: 0.9em;
  color: var(--accent-color);
}

.modal-body pre code {
  background: transparent;
  padding: 0;
  color: var(--text-primary);
}

/* 底部 */
.site-footer {
  margin-top: 4rem;
  border-top: 1px solid var(--border-color);
  padding-top: 2rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* 移动端适配 */
@media (max-width: 640px) {
  .layout-container {
    padding: 1.5rem 1rem 3rem;
  }
  .brand-row {
    flex-direction: column;
    align-items: flex-start;
  }
  .header-actions {
    width: 100%;
    justify-content: space-between;
  }
  .modal-card {
    padding: 1.5rem;
  }
  .modal-title {
    font-size: 1.35rem;
  }
}