/* ============================================
   lemonsin Theme - A fresh Hexo blog theme
   ============================================ */

/* ---------- CSS Variables ---------- */
:root {
  /* Colors - Lemon palette */
  --color-accent: #F5C518;
  --color-accent-light: #FFE066;
  --color-accent-dark: #D4A017;
  --color-lemon-bg: #FFFDF5;
  --color-lemon-tint: #FFF8E1;

  /* Neutral colors */
  --color-text: #2D2D2D;
  --color-text-light: #666;
  --color-text-muted: #999;
  --color-border: #E8E5DA;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F9F8F4;

  /* Link colors */
  --color-link: #C99700;
  --color-link-hover: var(--color-accent-dark);

  /* Code colors */
  --color-code-bg: #F6F5EF;
  --color-code-text: #4A4A4A;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  --font-serif: 'Lora', Georgia, 'Times New Roman', serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, 'Courier New', monospace;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;

  /* Layout */
  --container-max: 800px;
  --container-wide: 1100px;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  --shadow-hover: 0 6px 20px rgba(0, 0, 0, 0.10);
  --transition: 0.25s ease;
}

/* ---------- Dark Mode ---------- */
[data-theme="dark"] {
  --color-accent: #F5C518;
  --color-accent-light: #8B7500;
  --color-accent-dark: #FFE066;
  --color-lemon-bg: #1E1E1E;
  --color-lemon-tint: #2A2410;

  --color-text: #E0E0E0;
  --color-text-light: #AAAAAA;
  --color-text-muted: #777777;
  --color-border: #333333;
  --color-bg: #1A1A1A;
  --color-bg-alt: #222222;

  --color-link: #FFE066;
  --color-link-hover: #F5C518;

  --color-code-bg: #2A2A2A;
  --color-code-text: #CCCCCC;

  --shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 6px 20px rgba(0, 0, 0, 0.5);
}

/* Smooth theme transition */
html {
  transition: color 0.3s ease, background-color 0.3s ease;
}
* {
  transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}
*::before,
*::after {
  transition: background-color 0.3s ease;
}

/* Theme toggle button */
.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text);
  font-size: 1.2rem;
  transition: all var(--transition);
}

.theme-toggle:hover {
  background: var(--color-lemon-tint);
}

/* ---------- Reset ---------- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--color-link);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-link-hover);
}

img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
}

ul,
ol {
  list-style: none;
}

/* ---------- Layout ---------- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-sm);
}

.site-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.site-main {
  flex: 1;
  padding: var(--space-md) 0;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  max-width: var(--container-wide);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  padding: 0 var(--space-sm);
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--color-text);
}

.site-logo:hover {
  color: var(--color-text);
}

.logo-icon {
  font-size: 1.4rem;
}

.nav-list {
  display: flex;
  gap: var(--space-sm);
  align-items: center;
}

.nav-link {
  color: var(--color-text-light);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  position: relative;
}

.nav-link:hover {
  color: var(--color-text);
  background: var(--color-lemon-tint);
}

.nav-link.active {
  color: var(--color-accent-dark);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 3px;
  background: var(--color-accent);
  border-radius: 2px;
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: var(--transition);
}

/* ---------- Post List (Home) ---------- */
.post-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.post-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-sm) var(--space-md);
  transition: box-shadow var(--transition), transform var(--transition);
}

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

.post-card-header {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  margin-bottom: 0.5rem;
}

.post-date {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

.post-category a {
  font-size: 0.8rem;
  color: var(--color-accent-dark);
  background: var(--color-lemon-tint);
  padding: 2px 8px;
  border-radius: 4px;
}

.post-card-title {
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.6rem;
}

.post-card-title a {
  color: var(--color-text);
}

.post-card-title a:hover {
  color: var(--color-link-hover);
}

.post-card-excerpt {
  color: var(--color-text-light);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 1rem;
}

.post-card-excerpt p {
  margin-bottom: 0.5rem;
}

.post-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.post-tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.tag {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  background: var(--color-bg-alt);
  padding: 3px 10px;
  border-radius: 20px;
  transition: all var(--transition);
}

.tag:hover {
  color: var(--color-accent-dark);
  background: var(--color-lemon-tint);
}

.read-more {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-accent-dark);
  white-space: nowrap;
}

/* ---------- Post Detail ---------- */
.post-detail {
  background: var(--color-bg);
}

.post-header {
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
}

.post-title {
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 0.6rem;
  color: var(--color-text);
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.meta-divider {
  color: var(--color-border);
}

.post-updated {
  font-style: italic;
}

/* ---------- Post Content (Markdown) ---------- */
.post-content,
.page-content {
  font-family: var(--font-serif);
  font-size: 1.08rem;
  line-height: 1.85;
  color: var(--color-text);
}

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4,
.post-content h5,
.post-content h6,
.page-content h1,
.page-content h2,
.page-content h3,
.page-content h4,
.page-content h5,
.page-content h6 {
  font-family: var(--font-sans);
  font-weight: 700;
  line-height: 1.3;
  margin-top: 2rem;
  margin-bottom: 0.8rem;
}

.post-content h2,
.page-content h2 {
  font-size: 1.6rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--color-accent-light);
}

.post-content h3,
.page-content h3 {
  font-size: 1.3rem;
}

.post-content p,
.page-content p {
  margin-bottom: 1.2rem;
}

.post-content a,
.page-content a {
  color: var(--color-link);
  text-decoration: underline;
  text-decoration-color: var(--color-accent-light);
  text-underline-offset: 3px;
}

.post-content a:hover,
.page-content a:hover {
  text-decoration-color: var(--color-accent);
}

.post-content ul,
.post-content ol,
.page-content ul,
.page-content ol {
  margin: 1rem 0 1.2rem 1.5rem;
}

.post-content ul li,
.page-content ul li {
  list-style: disc;
  margin-bottom: 0.4rem;
}

.post-content ol li,
.page-content ol li {
  list-style: decimal;
  margin-bottom: 0.4rem;
}

.post-content blockquote,
.page-content blockquote {
  margin: 1.5rem 0;
  padding: 0.8rem 1.5rem;
  border-left: 4px solid var(--color-accent);
  background: var(--color-lemon-tint);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--color-text-light);
}

.post-content blockquote p:last-child,
.page-content blockquote p:last-child {
  margin-bottom: 0;
}

.post-content img,
.page-content img {
  display: block;
  margin: 1.5rem auto;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.post-content table,
.page-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.95rem;
}

.post-content th,
.post-content td,
.page-content th,
.page-content td {
  border: 1px solid var(--color-border);
  padding: 0.6rem 1rem;
  text-align: left;
}

.post-content th,
.page-content th {
  background: var(--color-bg-alt);
  font-weight: 600;
}

.post-content tr:nth-child(even),
.page-content tr:nth-child(even) {
  background: var(--color-lemon-bg);
}

.post-content hr,
.page-content hr {
  border: none;
  border-top: 2px dashed var(--color-border);
  margin: 2rem 0;
}

/* ---------- Code Blocks ---------- */
.post-content code,
.page-content code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--color-code-bg);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--color-code-text);
}

.post-content pre,
.page-content pre {
  background: var(--color-code-bg);
  border-radius: var(--radius);
  overflow-x: auto;
  margin: 1.2rem 0;
  padding: 0;
  border: 1px solid var(--color-border);
}

.post-content pre code,
.page-content pre code {
  background: transparent;
  padding: 1rem 1.2rem;
  display: block;
  font-size: 0.88rem;
  line-height: 1.6;
}

/* Hexo highlight */
.highlight {
  background: var(--color-code-bg) !important;
  border-radius: var(--radius);
  overflow-x: auto;
  margin: 1.2rem 0;
  border: 1px solid var(--color-border);
}

.highlight pre {
  border: none;
  margin: 0;
  background: transparent !important;
  border-radius: 0;
}

.highlight table {
  width: 100%;
  margin: 0;
  border: none;
}

.highlight td {
  border: none;
  padding: 0;
}

.highlight .gutter {
  width: 40px;
  text-align: right;
  padding: 1rem 0.6rem;
  border-right: 1px solid var(--color-border);
  color: var(--color-text-muted);
  user-select: none;
}

.highlight .gutter pre {
  padding: 0;
  color: var(--color-text-muted);
}

.highlight .code {
  padding: 1rem 1.2rem;
}

.highlight .code pre {
  padding: 0;
}

/* Highlight.js token colors */
.hljs-keyword,
.hljs-selector-tag,
.hljs-built_in { color: #C792EA; }

.hljs-string,
.hljs-attr { color: #C3E88D; }

.hljs-number,
.hljs-literal { color: #F78C6C; }

.hljs-comment,
.hljs-quote { color: #90A4AE; font-style: italic; }

.hljs-function .hljs-title,
.hljs-title,
.hljs-section { color: #82AAFF; }

.hljs-variable,
.hljs-template-variable { color: #EEFFFF; }

.hljs-type,
.hljs-class .hljs-title { color: #FFCB6B; }

.hljs-tag,
.hljs-name { color: #F07178; }

.hljs-attribute { color: #FFCB6B; }

.hljs-meta { color: #82AAFF; }

/* ---------- Post Footer & Tags ---------- */
.post-footer {
  margin-top: var(--space-md);
  padding-top: var(--space-sm);
  border-top: 1px solid var(--color-border);
}

.post-footer .post-tags {
  gap: 0.6rem;
}

.post-footer .tag {
  font-size: 0.85rem;
  padding: 4px 14px;
}

/* ---------- Post Navigation ---------- */
.post-nav {
  display: flex;
  justify-content: space-between;
  gap: var(--space-sm);
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border);
}

.post-nav-link {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: var(--space-sm);
  border-radius: var(--radius);
  background: var(--color-bg-alt);
  max-width: 48%;
  transition: all var(--transition);
}

.post-nav-link:hover {
  background: var(--color-lemon-tint);
  transform: translateY(-2px);
}

.post-nav-link.next {
  margin-left: auto;
  text-align: right;
}

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

.nav-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
}

/* ---------- Pagination ---------- */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  margin-top: var(--space-md);
  padding: var(--space-sm) 0;
}

.page-link {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1.2rem;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--color-text);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}

.page-link:hover:not(.disabled) {
  background: var(--color-lemon-tint);
  border-color: var(--color-accent);
}

.page-link.disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.page-info {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  min-width: 60px;
  text-align: center;
}

/* ---------- Page (About, etc.) ---------- */
.page-detail {
  background: var(--color-bg);
}

.page-header {
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
}

.page-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-text);
}

/* ---------- Tags Page ---------- */
.tag-header {
  margin-bottom: var(--space-md);
}

.tag-count {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-top: 0.3rem;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: var(--space-sm);
}

.tag-cloud-item {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1.2rem;
  border-radius: 24px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  font-size: 0.95rem;
  font-weight: 500;
  transition: all var(--transition);
}

.tag-cloud-item:hover {
  background: var(--color-lemon-tint);
  border-color: var(--color-accent);
  color: var(--color-accent-dark);
  transform: translateY(-2px);
}

.tag-cloud-item .tag-count {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  background: var(--color-bg);
  padding: 1px 8px;
  border-radius: 12px;
}

/* ---------- Archive ---------- */
.archive-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.archive-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.8rem 0;
  border-bottom: 1px solid var(--color-border);
}

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

.archive-date {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  font-weight: 500;
  min-width: 100px;
  font-family: var(--font-mono);
}

.archive-title {
  color: var(--color-text);
  font-weight: 500;
}

.archive-title:hover {
  color: var(--color-link-hover);
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  padding: var(--space-md) 0;
  margin-top: var(--space-lg);
}

.footer-inner {
  max-width: var(--container-wide);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-sm);
  padding: 0 var(--space-sm);
}

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

.social-list {
  display: flex;
  gap: var(--space-sm);
}

.social-link {
  font-size: 0.9rem;
  color: var(--color-text-light);
  font-weight: 500;
  transition: color var(--transition);
}

.social-link:hover {
  color: var(--color-accent-dark);
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  :root {
    --space-md: 1.5rem;
    --space-lg: 3rem;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition);
  }

  .site-nav.open {
    max-height: 300px;
  }

  .nav-list {
    flex-direction: column;
    padding: var(--space-sm);
    gap: 0.5rem;
    align-items: stretch;
  }

  .nav-link {
    display: block;
    padding: 0.8rem;
  }

  .nav-link.active::after {
    display: none;
  }

  .post-title {
    font-size: 1.6rem;
  }

  .post-card-title {
    font-size: 1.25rem;
  }

  .post-content,
  .page-content {
    font-size: 1rem;
  }

  .post-nav {
    flex-direction: column;
  }

  .post-nav-link {
    max-width: 100%;
  }

  .post-nav-link.next {
    text-align: left;
    margin-left: 0;
  }

  .archive-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.2rem;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }

  .highlight .gutter {
    display: none;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 0.8rem;
  }

  .post-card {
    padding: var(--space-sm);
  }
}

/* ---------- Animations ---------- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(15px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.post-card {
  animation: fadeInUp 0.4s ease backwards;
}

.post-card:nth-child(2) { animation-delay: 0.1s; }
.post-card:nth-child(3) { animation-delay: 0.2s; }
.post-card:nth-child(4) { animation-delay: 0.3s; }
.post-card:nth-child(5) { animation-delay: 0.4s; }

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-alt);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-accent-light);
}

/* ---------- Selection ---------- */
::selection {
  background: var(--color-accent-light);
  color: var(--color-text);
}