/**
 * The Modern Scholar - Custom Theme Override
 * Based on PaperMod theme with custom styling
 */

/* ========================================
   字体配置
   ======================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Newsreader:ital,wght@0,300;0,400;0,500;1,300;1,400&display=swap');

:root {
  /* 颜色系统 - 亮色模式 */
  --background: #fbf9f3;
  --surface: #fbf9f3;
  --on-background: #1b1c19;
  --on-surface: #1b1c19;
  --on-surface-variant: #444748;
  --primary: #000000;
  --on-primary: #ffffff;
  --secondary: #5e5e5e;
  --tertiary: #000000;
  --outline: #747878;
  --outline-variant: #c4c7c7;

  /* 字体 */
  --font-headline: 'Newsreader', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-label: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* 间距 */
  --content-width: 1440px;
  --content-padding: 3.5rem;
  --spacing-section: 12rem;

  /* 过渡 */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
}

/* 暗色模式 */
.dark {
  --background: #1c1b1b;
  --surface: #1c1b1b;
  --on-background: #fbf9f3;
  --on-surface: #fbf9f3;
  --on-surface-variant: #c4c7c7;
  --primary: #c8c6c5;
  --on-primary: #1c1b1b;
  --secondary: #c7c6c6;
  --tertiary: #e5e2e1;
  --outline: #747878;
  --outline-variant: #474746;
}

/* ========================================
   全局样式
   ======================================== */

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--background);
  color: var(--on-background);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.7;
  font-weight: 400;
  letter-spacing: -0.01em;
}

/* ========================================
   导航栏
   ======================================== */

.navbar {
  background-color: transparent;
  padding: 3rem 0 2rem;
  border-bottom: none;
}

.navbar-content {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 var(--content-padding);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.navbar-brand {
  font-family: var(--font-headline);
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--on-background);
  letter-spacing: -0.03em;
  text-decoration: none;
}

.navbar-nav {
  display: flex;
  gap: 3rem;
  align-items: baseline;
}

.nav-link {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--on-surface);
  text-decoration: none;
  padding-bottom: 0.125rem;
  opacity: 0.8;
  transition: opacity var(--transition-normal);
}

.nav-link:hover {
  opacity: 1;
  color: var(--on-background);
}

.nav-link.active {
  border-bottom: 1px solid var(--on-background);
  opacity: 1;
}

/* ========================================
   首页 Hero 区域
   ======================================== */

.hero-section {
  max-width: var(--content-width);
  margin: 3rem auto 4rem;
  padding: 0 var(--content-padding);
}

.hero-title {
  font-family: var(--font-headline);
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.1;
  font-weight: 300;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
  color: var(--on-background);
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--on-surface-variant);
  font-weight: 300;
  line-height: 1.6;
  max-width: 42rem;
}

/* ========================================
   文章列表
   ======================================== */

.posts-container {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 var(--content-padding);
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 6rem 2rem;
}

.posts-list {
  grid-column: 1 / 9;
}

.post-entry {
  margin-bottom: 2rem;
}

.post-entry-title {
  font-family: var(--font-headline);
  font-size: 1.5rem;
  font-style: italic;
  font-weight: 400;
  color: var(--on-background);
  text-decoration: none;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 2rem;
  transition: opacity var(--transition-normal);
}

.post-entry-title:hover {
  opacity: 0.6;
}

.post-entry-meta {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--on-surface-variant);
  white-space: nowrap;
}

/* ========================================
   侧边栏（Selected Work）
   ======================================== */

.sidebar-section {
  grid-column: 10 / 13;
}

.sidebar-title {
  font-family: var(--font-label);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--on-surface-variant);
  margin-bottom: 3rem;
}

.sidebar-list {
  list-style: none;
  padding: 0;
}

.sidebar-item {
  margin-bottom: 1.5rem;
}

.sidebar-link {
  text-decoration: none;
  color: inherit;
  display: block;
  transition: opacity var(--transition-normal);
}

.sidebar-link:hover {
  opacity: 0.8;
}

.sidebar-link-title {
  font-size: 0.875rem;
  font-weight: 400;
  margin-bottom: 0.25rem;
}

.sidebar-link-description {
  font-size: 0.75rem;
  color: var(--on-surface-variant);
  line-height: 1.6;
}

/* ========================================
   文章页面
   ======================================== */

.post-container {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 var(--content-padding);
}

.post-header {
  max-width: 42rem;
  margin: 0 auto 4rem;
}

.post-title {
  font-family: var(--font-headline);
  font-size: clamp(2.5rem, 5vw, 4rem);
  line-height: 1.1;
  font-weight: 300;
  letter-spacing: -0.03em;
  margin-bottom: 0;
  color: var(--on-background);
}

.post-meta {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--on-surface-variant);
}

.post-content {
  max-width: 42rem;
  margin: 0 auto;
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--on-surface);
}

.post-content p {
  margin-bottom: 1.5rem;
}

.post-content h2 {
  font-family: var(--font-headline);
  font-size: 1.75rem;
  font-weight: 400;
  margin-top: 3rem;
  margin-bottom: 1rem;
  color: var(--on-background);
}

.post-content h3 {
  font-family: var(--font-headline);
  font-size: 1.375rem;
  font-weight: 400;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  color: var(--on-background);
}

.post-content a {
  color: var(--on-background);
  text-decoration: underline;
  text-underline-offset: 0.2em;
  transition: opacity var(--transition-fast);
}

.post-content a:hover {
  opacity: 0.6;
}

.post-content blockquote {
  border-left: 2px solid var(--outline);
  padding-left: 1.5rem;
  margin: 2rem 0;
  font-style: italic;
  color: var(--on-surface-variant);
}

.post-content code {
  font-family: 'SF Mono', 'Monaco', 'Inconsolata', monospace;
  font-size: 0.9em;
  background-color: var(--outline-variant);
  padding: 0.2em 0.4em;
  border-radius: 3px;
}

.post-content pre {
  background-color: var(--on-background);
  color: var(--background);
  padding: 1.5rem;
  border-radius: 0;
  overflow-x: auto;
  margin: 2rem 0;
}

.post-content pre code {
  background-color: transparent;
  padding: 0;
}

/* ========================================
   页脚
   ======================================== */

.footer {
  background-color: transparent;
  padding: 6rem 0;
  margin-top: var(--spacing-section);
  border-top: none;
}

.footer-content {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 var(--content-padding);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 2rem;
}

.footer-copyright {
  font-family: var(--font-label);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--on-surface-variant);
}

.footer-links {
  display: flex;
  gap: 3rem;
}

.footer-link {
  font-family: var(--font-label);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--on-surface-variant);
  text-decoration: none;
  transition: color var(--transition-normal);
}

.footer-link:hover {
  color: var(--on-background);
}

/* ========================================
   响应式设计
   ======================================== */

@media (max-width: 768px) {
  :root {
    --content-padding: 2rem;
  }

  .navbar-content {
    flex-direction: column;
    gap: 1rem;
  }

  .navbar-nav {
    width: 100%;
    justify-content: space-around;
    gap: 1rem;
  }

  .hero-title {
    font-size: 3.5rem;
  }

  .posts-container {
    grid-template-columns: 1fr;
  }

  .posts-list {
    grid-column: 1;
  }

  .sidebar-section {
    grid-column: 1;
  }

  .post-entry-title {
    flex-direction: column;
    gap: 0.5rem;
  }

  .footer-content {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-links {
    flex-wrap: wrap;
    gap: 1.5rem;
  }
}

/* ========================================
   PaperMod 特定覆盖
   ======================================== */

/* 隐藏默认元素 */
main {
  background-color: transparent !important;
}

article {
  background-color: transparent !important;
}

/* 覆盖文章卡片样式 */
.post-entry:has(.entry-cover) .entry-title,
.post-entry:has(.entry-content) {
  display: none;
}

/* 隐藏阅读时间等元数据（可选） */
.post-meta-items {
  display: none;
}