/* ========== CSS 变量 & 主题系统 ========== */
:root {
  --color-primary: #f5f5f5;
  --color-secondary: #e8e8e8;
  --color-navbar: #d0d0d0;
  --color-text: #333333;
  --color-accent: #6b7280;
  --color-border: rgba(0, 0, 0, 0.08);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;
  
  --font-sans: "Noto Sans JP", "Hiragino Sans", "Microsoft YaHei", sans-serif;
  --font-serif: "Noto Serif JP", "Source Han Serif CN", serif;
  --font-mono: "JetBrains Mono", "Fira Code", monospace;
}

[data-theme="light-gray"] {
  --color-primary: #f5f5f5;
  --color-secondary: #e8e8e8;
  --color-navbar: #d0d0d0;
  --color-text: #333333;
  --color-accent: #6b7280;
  --color-border: rgba(0, 0, 0, 0.08);
}

[data-theme="light-blue"] {
  --color-primary: #f0f7ff;
  --color-secondary: #e1efff;
  --color-navbar: #c5dcf5;
  --color-text: #2c3e50;
  --color-accent: #5b8fb9;
  --color-border: rgba(91, 143, 185, 0.15);
}

[data-theme="light-pink"] {
  --color-primary: #fff5f5;
  --color-secondary: #ffe8e8;
  --color-navbar: #f5d0d0;
  --color-text: #4a3f3f;
  --color-accent: #c9a3a3;
  --color-border: rgba(201, 163, 163, 0.2);
}

[data-theme="dark"] {
  --color-primary: #1a1a1a;
  --color-secondary: #252525;
  --color-navbar: #0d0d0d;
  --color-text: #e0e0e0;
  --color-accent: #888888;
  --color-border: rgba(255, 255, 255, 0.1);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.5);
}

/* ========== 基础样式 ========== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-primary);
  color: var(--color-text);
  line-height: 1.8;
  transition: var(--transition);
  min-height: 100vh;
}

/* ========== 阅读进度条 ========== */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  background: var(--color-accent);
  z-index: 9999;
  width: 0;
  transition: width 0.1s;
}

/* ========== 横向导航栏 ========== */
.top-navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 60px;
  background-color: var(--color-navbar);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  transition: var(--transition);
}

.top-navbar .logo {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
  font-family: var(--font-serif);
  letter-spacing: 0.05em;
}

.top-navbar .logo::before {
  content: "🌸 ";
}

.top-navbar nav {
  display: flex;
  gap: 0.5rem;
}

.top-navbar nav a {
  color: var(--color-text);
  text-decoration: none;
  padding: 0.5rem 1.25rem;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

.top-navbar nav a:hover {
  background-color: var(--color-secondary);
}

.top-navbar nav a.active {
  background-color: var(--color-primary);
}

.top-navbar nav a.active::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 2px;
  background-color: var(--color-accent);
  border-radius: 1px;
}

/* 导航栏右侧操作区 */
.navbar-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* 搜索按钮 */
.search-btn {
  background: none;
  border: none;
  color: var(--color-text);
  font-size: 1.1rem;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 8px;
  transition: var(--transition);
}

.search-btn:hover {
  background-color: var(--color-secondary);
}

/* 主题切换器 */
.theme-switcher {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.theme-btn {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 2px solid var(--color-border);
  cursor: pointer;
  transition: var(--transition);
}

.theme-btn:hover {
  transform: scale(1.1);
}

.theme-btn.active {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 2px var(--color-primary), 0 0 0 4px var(--color-accent);
}

.theme-btn[data-theme="light-gray"] { background: linear-gradient(135deg, #f5f5f5, #d0d0d0); }
.theme-btn[data-theme="light-blue"] { background: linear-gradient(135deg, #f0f7ff, #c5dcf5); }
.theme-btn[data-theme="light-pink"] { background: linear-gradient(135deg, #fff5f5, #f5d0d0); }
.theme-btn[data-theme="dark"] { background: linear-gradient(135deg, #1a1a1a, #0d0d0d); }

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-text);
}

/* ========== 搜索弹窗 ========== */
.search-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 2000;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 10vh;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.search-overlay.active {
  opacity: 1;
  visibility: visible;
}

.search-modal {
  background-color: var(--color-primary);
  border-radius: 16px;
  width: 90%;
  max-width: 600px;
  max-height: 70vh;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  transform: translateY(-20px);
  transition: var(--transition);
}

.search-overlay.active .search-modal {
  transform: translateY(0);
}

.search-header {
  display: flex;
  align-items: center;
  padding: 1rem;
  border-bottom: 1px solid var(--color-border);
  gap: 1rem;
}

.search-input-wrapper {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background-color: var(--color-secondary);
  padding: 0.75rem 1rem;
  border-radius: 10px;
}

.search-input-wrapper i {
  color: var(--color-accent);
}

.search-input-wrapper input {
  flex: 1;
  border: none;
  background: none;
  font-size: 1rem;
  color: var(--color-text);
  outline: none;
  font-family: var(--font-sans);
}

.search-input-wrapper input::placeholder {
  color: var(--color-accent);
}

.search-input-wrapper kbd {
  background-color: var(--color-navbar);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-size: 0.75rem;
  color: var(--color-accent);
}

.search-close {
  background: none;
  border: none;
  color: var(--color-accent);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 8px;
  transition: var(--transition);
}

.search-close:hover {
  background-color: var(--color-secondary);
  color: var(--color-text);
}

.search-results {
  max-height: calc(70vh - 80px);
  overflow-y: auto;
  padding: 1rem;
}

.search-hint {
  text-align: center;
  color: var(--color-accent);
  padding: 2rem;
}

.search-result-item {
  display: block;
  padding: 1rem;
  border-radius: 10px;
  text-decoration: none;
  color: var(--color-text);
  transition: var(--transition);
  margin-bottom: 0.5rem;
}

.search-result-item:hover {
  background-color: var(--color-secondary);
}

.search-result-title {
  font-weight: 600;
  margin-bottom: 0.25rem;
  font-size: 1rem;
}

.search-result-title mark {
  background-color: rgba(255, 200, 0, 0.3);
  color: inherit;
  padding: 0 2px;
  border-radius: 2px;
}

.search-result-content {
  font-size: 0.85rem;
  color: var(--color-accent);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.search-result-content mark {
  background-color: rgba(255, 200, 0, 0.3);
  color: inherit;
}

.search-result-meta {
  font-size: 0.75rem;
  color: var(--color-accent);
  margin-top: 0.5rem;
}

.search-no-results {
  text-align: center;
  padding: 2rem;
  color: var(--color-accent);
}

/* ========== 主布局 ========== */
.main-container {
  display: flex;
  margin-top: 60px;
  min-height: calc(100vh - 60px);
}

/* ========== 侧边导航栏 ========== */
.side-navbar {
  width: 260px;
  min-width: 260px;
  background-color: var(--color-secondary);
  border-right: 1px solid var(--color-border);
  padding: 1.5rem 0;
  position: fixed;
  top: 60px;
  left: 0;
  bottom: 0;
  overflow-y: auto;
  transition: var(--transition);
}

.side-navbar::-webkit-scrollbar {
  width: 4px;
}

.side-navbar::-webkit-scrollbar-track {
  background: transparent;
}

.side-navbar::-webkit-scrollbar-thumb {
  background-color: var(--color-accent);
  border-radius: 2px;
  opacity: 0.5;
}

.side-navbar .nav-section {
  margin-bottom: 1.5rem;
}

.side-navbar .nav-section-title {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  padding: 0 1.5rem;
  margin-bottom: 0.5rem;
}

.side-navbar .nav-list {
  list-style: none;
}

.side-navbar .nav-link {
  display: flex;
  align-items: center;
  padding: 0.6rem 1.5rem;
  color: var(--color-text);
  text-decoration: none;
  font-size: 0.9rem;
  transition: var(--transition);
  border-left: 3px solid transparent;
}

.side-navbar .nav-link:hover {
  background-color: var(--color-primary);
  border-left-color: var(--color-accent);
}

.side-navbar .nav-link.active {
  background-color: var(--color-primary);
  border-left-color: var(--color-accent);
  font-weight: 500;
}

.side-navbar .nav-link .icon {
  margin-right: 0.75rem;
  font-size: 1rem;
  opacity: 0.7;
}

.side-navbar .nav-submenu {
  list-style: none;
  padding-left: 1rem;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.side-navbar .nav-item.expanded .nav-submenu {
  max-height: 500px;
}

.side-navbar .nav-toggle {
  cursor: pointer;
}

.side-navbar .nav-toggle::after {
  content: "▸";
  margin-left: auto;
  font-size: 0.8rem;
  transition: transform 0.3s ease;
}

.side-navbar .nav-item.expanded .nav-toggle::after {
  transform: rotate(90deg);
}

/* ========== 正文区域 ========== */
.content-area {
  flex: 1;
  margin-left: 260px;
  padding: 2rem 3rem;
  max-width: 100%;
  transition: var(--transition);
}

.content-area.no-sidebar {
  margin-left: 0;
}

.article-container {
  max-width: 900px;
  margin: 0 auto;
}

/* 文章元信息 */
.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  padding: 1rem 1.5rem;
  background-color: var(--color-secondary);
  border-radius: 12px;
  margin-bottom: 2rem;
  font-size: 0.85rem;
  color: var(--color-accent);
  border: 1px solid var(--color-border);
}

.article-meta .meta-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.article-meta .meta-item .icon {
  font-size: 1rem;
}

.article-meta .meta-label {
  opacity: 0.7;
}

.article-meta .meta-value {
  font-weight: 500;
  color: var(--color-text);
}

/* 文章标题 */
.article-header {
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-border);
}

.article-title {
  font-size: 2rem;
  font-weight: 700;
  font-family: var(--font-serif);
  line-height: 1.4;
  color: var(--color-text);
  margin-bottom: 0.5rem;
}

.article-subtitle {
  font-size: 1.1rem;
  color: var(--color-accent);
  font-weight: 400;
}

/* Typst 内容区域 */
.typst-content {
  background-color: var(--color-primary);
  border-radius: 12px;
  padding: 2rem;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

[data-theme="dark"] .typst-content {
  background-color: var(--color-secondary);
}

/* ========== Typst 页面 ========== */
.typst-page {
  background-color: var(--color-primary);
  border-radius: 8px;
  padding: 1rem;
  margin-bottom: 1rem;
  overflow-x: auto;
  transition: var(--transition);
}

.typst-page:last-child {
  margin-bottom: 0;
}

.typst-page svg,
.typst-page .typst-svg {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 0 auto;
}

/* 深色模式 SVG 反转 */
[data-theme="dark"] .typst-page {
  background-color: #1e1e1e;
}

[data-theme="dark"] .typst-page svg {
  filter: invert(0.88) hue-rotate(180deg) contrast(0.95);
}

[data-theme="dark"] .typst-page svg image {
  filter: invert(1) hue-rotate(180deg);
}

/* 浅色主题微调 */
[data-theme="light-blue"] .typst-page svg {
  filter: sepia(0.03) saturate(1.05);
}

[data-theme="light-pink"] .typst-page svg {
  filter: sepia(0.05) saturate(1.02) hue-rotate(-5deg);
}

/* ========== 面包屑导航 ========== */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  font-size: 0.85rem;
  color: var(--color-accent);
}

.breadcrumb a {
  color: var(--color-accent);
  text-decoration: none;
  transition: var(--transition);
}

.breadcrumb a:hover {
  color: var(--color-text);
}

.breadcrumb .separator {
  opacity: 0.5;
}

/* ========== 日式装饰元素 ========== */
.decoration-line {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent) 20%, var(--color-accent) 80%, transparent);
  margin: 2rem 0;
  opacity: 0.3;
}

.section-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 2rem 0;
  color: var(--color-accent);
  opacity: 0.5;
}

.section-divider::before,
.section-divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background-color: var(--color-accent);
  margin: 0 1rem;
}

/* ========== 首页 ========== */
.home-hero {
  text-align: center;
  padding: 4rem 2rem;
  max-width: 700px;
  margin: 0 auto;
}

.home-hero h1 {
  font-size: 2.5rem;
  font-family: var(--font-serif);
  margin-bottom: 1rem;
}

.home-hero p {
  font-size: 1.1rem;
  color: var(--color-accent);
}

.article-list {
  display: grid;
  gap: 1.5rem;
  margin-top: 2rem;
}

.article-card {
  background-color: var(--color-secondary);
  border-radius: 12px;
  padding: 1.5rem;
  border: 1px solid var(--color-border);
  transition: var(--transition);
  text-decoration: none;
  color: inherit;
  display: block;
}

.article-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.article-card h3 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
  font-family: var(--font-serif);
}

.article-card p {
  font-size: 0.9rem;
  color: var(--color-accent);
  margin-bottom: 1rem;
}

.article-card .card-meta {
  font-size: 0.8rem;
  color: var(--color-accent);
  opacity: 0.8;
}

.empty-state {
  text-align: center;
  padding: 3rem;
  color: var(--color-accent);
}

/* ========== About Me 页面 ========== */
.about-page {
  padding: 2rem;
  min-height: calc(100vh - 60px);
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-container {
  display: flex;
  gap: 50px;
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
  align-items: flex-start;
}

.profile-side {
  flex: 0 0 300px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.profile-sticky {
  position: sticky;
  top: 100px;
}

.avatar {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--color-secondary);
  box-shadow: var(--shadow-md);
  margin-bottom: 20px;
  transition: var(--transition);
}

.avatar:hover {
  transform: scale(1.05) rotate(3deg);
}

.my-name {
  font-size: 2rem;
  margin-bottom: 10px;
  font-weight: 700;
  font-family: var(--font-serif);
  color: var(--color-text);
}

.my-title {
  color: var(--color-accent);
  margin-bottom: 30px;
  font-size: 1rem;
  line-height: 1.6;
}

.social-links {
  display: flex;
  gap: 15px;
  justify-content: center;
  flex-wrap: wrap;
}

.social-btn {
  width: 45px;
  height: 45px;
  border-radius: 50%;
  background-color: var(--color-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text);
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  font-size: 1.2rem;
  border: 1px solid var(--color-border);
}

.social-btn:hover {
  background-color: var(--color-accent);
  color: white;
  transform: translateY(-3px);
  border-color: var(--color-accent);
}

.content-side {
  flex: 1;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
}

.info-card {
  background-color: var(--color-secondary);
  padding: 30px;
  border-radius: 20px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border: 1px solid var(--color-border);
}

.info-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-md);
}

.card-icon {
  font-size: 2rem;
  color: var(--color-accent);
  margin-bottom: 15px;
}

.card-title {
  font-size: 1.25rem;
  margin-bottom: 12px;
  font-weight: 600;
  font-family: var(--font-serif);
  color: var(--color-text);
}

.card-desc {
  color: var(--color-text);
  font-size: 0.95rem;
  line-height: 1.7;
}

.card-desc strong {
  color: var(--color-accent);
}

/* About 页面响应式 */
@media (max-width: 900px) {
  .about-container {
    flex-direction: column;
    align-items: center;
    gap: 40px;
  }
  
  .profile-side {
    flex: none;
    width: 100%;
    max-width: 400px;
    padding-bottom: 30px;
    border-bottom: 1px solid var(--color-border);
  }
  
  .profile-sticky {
    position: static;
  }
  
  .content-side {
    width: 100%;
    max-width: 700px;
  }
}

@media (max-width: 600px) {
  .about-page {
    padding: 1rem;
  }
  
  .content-side {
    grid-template-columns: 1fr;
  }
  
  .info-card {
    padding: 20px;
  }
  
  .avatar {
    width: 150px;
    height: 150px;
  }
  
  .my-name {
    font-size: 1.75rem;
  }
}

/* ========== 动画 ========== */
.fade-in {
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ========== 返回顶部按钮 ========== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 45px;
  height: 45px;
  border-radius: 50%;
  background-color: var(--color-secondary);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background-color: var(--color-accent);
  color: white;
  border-color: var(--color-accent);
  transform: translateY(-3px);
}

.back-to-top:active {
  transform: translateY(0);
}

/* 深色模式下的返回顶部按钮 */
[data-theme="dark"] .back-to-top {
  background-color: var(--color-secondary);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
}

/* 响应式调整 */
@media (max-width: 768px) {
  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    font-size: 1rem;
  }
}