/* ========================================
   Developer Editorial - Technical Blog
   Minimalist Design System
   ======================================== */

/* ----------------------------------------
   Design Tokens
   ---------------------------------------- */
:root {
  /* Background - Warm grayscale */
  --bg-primary: #fafaf9;
  --bg-secondary: #f5f5f4;
  --bg-tertiary: #e7e5e4;
  
  /* Text - Warm grayscale */
  --text-primary: #1c1917;
  --text-secondary: #57534e;
  --text-tertiary: #a8a29e;
  
  /* Border */
  --border: #e7e5e4;
  --border-strong: #d6d3d1;
  
  /* Accent (subtle) */
  --accent: #44403c;
  --accent-hover: #292524;
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  
  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Fira Code', monospace;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
}

/* Dark Mode */
.dark {
  --bg-primary: #0c0a09;
  --bg-secondary: #1c1917;
  --bg-tertiary: #292524;
  
  --text-primary: #fafaf9;
  --text-secondary: #a8a29e;
  --text-tertiary: #57534e;
  
  --border: #292524;
  --border-strong: #44403c;
  
  --accent: #d6d3d1;
  --accent-hover: #e7e5e4;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
}

::selection {
  background: var(--text-tertiary);
  color: var(--bg-primary);
}

.dark ::selection {
  background: var(--text-secondary);
  color: var(--bg-primary);
}

/* ----------------------------------------
   Layout
   ---------------------------------------- */
main {
  min-height: calc(100vh - 60px);
  padding-top: 60px;
}

.max-w-6xl {
  max-width: 1200px;
  margin: 0 auto;
}

.max-w-3xl {
  max-width: 720px;
  margin: 0 auto;
}

.px-6 {
  padding-left: var(--space-6);
  padding-right: var(--space-6);
}

.pb-20 {
  padding-bottom: var(--space-20);
}

/* Grid */
.grid {
  display: grid;
}

.grid-cols-1 {
  grid-template-columns: 1fr;
}

.gap-8 {
  gap: var(--space-8);
}

.flex {
  display: flex;
}

.items-center {
  align-items: center;
}

.justify-between {
  justify-content: space-between;
}

.gap-4 {
  gap: var(--space-4);
}

.gap-8 {
  gap: var(--space-8);
}

.hidden {
  display: none;
}

.block {
  display: block;
}

@media (min-width: 768px) {
  .md\:flex {
    display: flex;
  }
}

@media (min-width: 1024px) {
  .lg\:grid-cols-12 {
    grid-template-columns: 240px 1fr;
  }
  
  .lg\:col-span-3 {
    grid-column: span 1;
  }
  
  .lg\:col-span-9 {
    grid-column: span 1;
  }
}

@media (min-width: 1280px) {
  .xl\:block {
    display: block;
  }
}

/* ----------------------------------------
   Navigation
   ---------------------------------------- */
.nav-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: 60px;
  background: rgba(250, 250, 249, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.dark .nav-bar {
  background: rgba(12, 10, 9, 0.95);
}

.reading-progress-container {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: transparent;
  overflow: hidden;
}

.reading-progress-bar {
  height: 100%;
  background: var(--text-primary);
  width: 0%;
  transition: width 0.1s linear;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 600;
  font-size: 16px;
  color: var(--text-primary);
  text-decoration: none;
}

.brand-icon {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--text-primary);
  color: var(--bg-primary);
  border-radius: 4px;
  font-size: 14px;
  font-weight: 700;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin-left: var(--space-8);
}

.nav-link {
  padding: var(--space-2) var(--space-3);
  font-size: 14px;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: 4px;
  transition: var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-primary);
}

.nav-link.active {
  color: var(--text-primary);
  font-weight: 500;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.icon-btn {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  border-radius: 4px;
  cursor: pointer;
  transition: var(--transition-fast);
  font-size: 18px;
  line-height: 1;
}

.icon-btn:hover {
  color: var(--text-primary);
  background: var(--bg-secondary);
}

/* ----------------------------------------
   Search Panel
   ---------------------------------------- */
.search-panel {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: var(--transition-base);
}

.dark .search-panel {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

.search-panel.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.search-wrapper {
  max-width: 600px;
  margin: 0 auto;
  padding: var(--space-5) var(--space-6);
}

.search-input-wrapper {
  position: relative;
}

.search-icon {
  position: absolute;
  left: var(--space-3);
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-tertiary);
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
}

.search-input {
  width: 100%;
  padding: var(--space-3) var(--space-4) var(--space-3) 2.5rem;
  background: var(--bg-primary);
  border: 1.5px solid var(--border-strong);
  border-radius: 6px;
  font-size: 14px;
  color: var(--text-primary);
  outline: none;
  transition: var(--transition-fast);
}

.search-input:focus {
  border-color: var(--text-tertiary);
  box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.05);
}

.dark .search-input:focus {
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.05);
}

.search-input::placeholder {
  color: var(--text-tertiary);
}

.search-shortcut {
  position: absolute;
  right: var(--space-2);
  top: 50%;
  transform: translateY(-50%);
  padding: 2px 6px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 11px;
  color: var(--text-tertiary);
  font-family: var(--font-mono);
}

.search-results {
  margin-top: var(--space-4);
  max-height: 400px;
  overflow-y: auto;
}

.search-result-item {
  display: block;
  padding: var(--space-3) var(--space-4);
  border-radius: 6px;
  text-decoration: none;
  transition: var(--transition-fast);
}

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

.search-result-title {
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: var(--space-1);
  font-size: 14px;
}

.search-result-excerpt {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}

.search-no-results {
  padding: var(--space-8);
  text-align: center;
  color: var(--text-tertiary);
  font-size: 14px;
}

/* ----------------------------------------
   Page Header
   ---------------------------------------- */
.page-header {
  padding: var(--space-12) 0 var(--space-8);
  text-align: center;
  border-bottom: 1px solid var(--border);
  margin-bottom: var(--space-8);
}

.page-title {
  font-size: 28px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
  letter-spacing: -0.02em;
}

.page-subtitle {
  font-size: 15px;
  color: var(--text-secondary);
}

/* ----------------------------------------
   Sidebar
   ---------------------------------------- */
.sidebar-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.sidebar-block {
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--border);
}

.sidebar-block:last-child {
  border-bottom: none;
}

.sidebar-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-4);
}

.sidebar-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.sidebar-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) var(--space-3);
  margin: 0 calc(-1 * var(--space-3));
  font-size: 14px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
  border-radius: 4px;
  border-left: 2px solid transparent;
}

.sidebar-list li:hover {
  color: var(--text-primary);
  background: var(--bg-secondary);
}

.sidebar-list li.active {
  color: var(--text-primary);
  font-weight: 500;
  background: var(--bg-secondary);
  border-left-color: var(--text-primary);
}

.show-more-btn {
  display: block;
  width: 100%;
  margin-top: var(--space-3);
  padding: var(--space-2) 0;
  font-size: 13px;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  border-top: 1px dashed var(--border);
  cursor: pointer;
  text-align: center;
  transition: color 0.2s;
}

.show-more-btn:hover {
  color: var(--text-primary);
}

.sidebar-count {
  font-size: 12px;
  color: var(--text-tertiary);
  font-family: var(--font-mono);
}

.sidebar-list li.active .sidebar-count {
  color: var(--text-secondary);
}

/* Tag Cloud - Inline */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.tag-item {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
}

.tag-item:hover {
  border-color: var(--text-tertiary);
  color: var(--text-primary);
  background: var(--bg-secondary);
}

.tag-item.active {
  background: var(--text-primary);
  border-color: var(--text-primary);
  color: var(--bg-primary);
  font-weight: 500;
}

.tag-count {
  font-size: 11px;
  opacity: 0.7;
  font-family: var(--font-mono);
}

/* ----------------------------------------
   Filter Status
   ---------------------------------------- */
.filter-status {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-3) var(--space-4);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 6px;
  margin-bottom: var(--space-6);
}

.filter-status.hidden {
  display: none;
}

#filterLabel {
  font-size: 14px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.filter-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  background: var(--text-primary);
  color: var(--bg-primary);
  border-radius: 4px;
  font-size: 13px;
  font-weight: 500;
}

.filter-tag-remove {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  padding: 0;
  background: transparent;
  border: none;
  color: inherit;
  cursor: pointer;
  font-size: 14px;
  opacity: 0.7;
  transition: opacity 0.2s;
}

.filter-tag-remove:hover {
  opacity: 1;
}

.clear-filter-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 12px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition-fast);
  white-space: nowrap;
}

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

/* ----------------------------------------
   Posts List
   ---------------------------------------- */
.posts-container {
  display: flex;
  flex-direction: column;
}

.post-item {
  padding: var(--space-6) 0;
  border-bottom: 1px solid var(--border);
}

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

.post-item:first-child {
  padding-top: 0;
}

.post-meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-2);
  flex-wrap: wrap;
  font-size: 13px;
}

.post-category {
  color: var(--text-secondary);
  font-weight: 500;
}

.post-date {
  color: var(--text-tertiary);
}

.post-date::before {
  content: '·';
  margin-right: var(--space-3);
  color: var(--text-tertiary);
}

.post-origin {
  font-size: 13px;
  color: var(--text-tertiary);
}

.post-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
  line-height: 1.4;
}

.post-title a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition-fast);
}

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

.post-summary {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-3);
}

.post-tags {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.post-tag {
  font-size: 13px;
  color: var(--text-tertiary);
  transition: var(--transition-fast);
}

.post-tag:hover {
  color: var(--text-secondary);
}

.post-tag::before {
  content: '#';
}

/* ----------------------------------------
   Post Page
   ---------------------------------------- */
.post-header {
  padding: var(--space-12) 0 var(--space-8);
  margin-bottom: var(--space-10);
  border-bottom: 2px solid var(--border);
}

.post-header-content {
  max-width: 100%;
}

.post-header-meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--text-tertiary);
}

.post-header-title {
  font-size: 36px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-5);
}

.post-header-summary {
  font-size: 18px;
  color: var(--text-secondary);
  line-height: 1.7;
  font-weight: 400;
}

/* ----------------------------------------
   Table of Contents
   ---------------------------------------- */
.toc-container {
  position: fixed;
  right: calc((100vw - 720px) / 2 - 220px);
  top: 100px;
  bottom: 280px;
  width: 200px;
  display: none;
  overflow-y: auto;
}

@media (min-width: 1280px) {
  .toc-container {
    display: block;
  }
}

.toc-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-4);
}

.toc-nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  border-left: 1px solid var(--border);
  padding-left: var(--space-4);
}

.toc-nav a {
  display: block;
  padding: var(--space-1) 0;
  font-size: 13px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition-fast);
  line-height: 1.5;
}

.toc-nav a:hover {
  color: var(--text-primary);
}

.toc-nav a.active {
  color: var(--text-primary);
  font-weight: 500;
}

.toc-nav a.h3 {
  padding-left: var(--space-3);
  font-size: 12px;
}

/* ----------------------------------------
   Post Content
   ---------------------------------------- */
.post-content {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-secondary);
}

.post-content > *:first-child {
  margin-top: 0;
}

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4 {
  font-weight: 600;
  color: var(--text-primary);
  margin-top: var(--space-12);
  margin-bottom: var(--space-5);
  line-height: 1.4;
}

.post-content h1 {
  font-size: 28px;
}

.post-content h2 {
  font-size: 24px;
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--border);
}

.post-content h3 {
  font-size: 20px;
}

.post-content h4 {
  font-size: 17px;
}

.post-content p {
  margin-bottom: var(--space-5);
  color: var(--text-secondary);
}

.post-content a {
  color: var(--text-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-thickness: 1px;
  text-decoration-color: var(--text-tertiary);
  transition: var(--transition-fast);
}

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

.post-content ul,
.post-content ol {
  margin-bottom: var(--space-5);
  padding-left: var(--space-6);
  color: var(--text-secondary);
}

.post-content li {
  margin-bottom: var(--space-2);
}

.post-content li::marker {
  color: var(--text-tertiary);
}

.post-content blockquote {
  margin: var(--space-6) 0;
  padding: var(--space-4) var(--space-5);
  border-left: 2px solid var(--text-tertiary);
  color: var(--text-secondary);
  font-style: italic;
}

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

.post-content code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: 2px 5px;
  background: var(--bg-secondary);
  border-radius: 3px;
  color: var(--text-primary);
}

.post-content pre {
  margin: var(--space-6) 0;
  padding: var(--space-4);
  background: var(--bg-secondary);
  border-radius: 6px;
  overflow-x: auto;
  border: 1px solid var(--border);
}

.post-content pre code {
  background: transparent;
  padding: 0;
  font-size: 14px;
  line-height: 1.6;
}

.post-content table {
  width: 100%;
  margin: var(--space-6) 0;
  border-collapse: collapse;
  font-size: 14px;
}

.post-content th,
.post-content td {
  padding: var(--space-3) var(--space-4);
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.post-content th {
  font-weight: 600;
  color: var(--text-primary);
  background: var(--bg-secondary);
}

.post-content img {
  max-width: 100%;
  border-radius: 6px;
  margin: var(--space-6) 0;
}

.post-content hr {
  margin: var(--space-10) 0;
  border: none;
  border-top: 1px solid var(--border);
}

/* ----------------------------------------
   Post Footer
   ---------------------------------------- */
.post-footer {
  margin-top: var(--space-10);
  padding: var(--space-6) 0;
  border-top: 1px solid var(--border);
}

.post-footer-tags {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.post-footer-label {
  font-size: 14px;
  color: var(--text-tertiary);
}

.post-footer-tag {
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 13px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition-fast);
}

.post-footer-tag:hover {
  border-color: var(--border-strong);
  color: var(--text-primary);
}

/* ----------------------------------------
   Post Navigation
   ---------------------------------------- */
.post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
  margin-top: var(--space-10);
  padding-top: var(--space-6);
  border-top: 1px solid var(--border);
}

@media (max-width: 640px) {
  .post-nav {
    grid-template-columns: 1fr;
  }
}

.post-nav-item {
  padding: var(--space-4);
  border: 1px solid var(--border);
  border-radius: 6px;
  text-decoration: none;
  transition: var(--transition-fast);
}

.post-nav-item:hover {
  border-color: var(--border-strong);
}

.post-nav-item.next {
  text-align: right;
}

.post-nav-label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 12px;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-1);
}

.post-nav-item.next .post-nav-label {
  justify-content: flex-end;
}

.post-nav-title {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.4;
}

/* ----------------------------------------
   Comments Section
   ---------------------------------------- */
.comments-section {
  margin-top: var(--space-12);
  padding-top: var(--space-8);
  border-top: 1px solid var(--border);
}

.comments-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-6);
}

.comments-empty {
  text-align: center;
  padding: var(--space-10);
  color: var(--text-tertiary);
  font-size: 14px;
}

/* ----------------------------------------
   Footer
   ---------------------------------------- */
.footer {
  border-top: 1px solid var(--border);
  margin-top: auto;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-6);
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-8);
  padding-bottom: var(--space-8);
  border-bottom: 1px solid var(--border);
  margin-bottom: var(--space-6);
}

.footer-grid--2col {
  grid-template-columns: 1fr 1fr;
}

.footer-grid--2col .footer-about,
.footer-grid--2col .footer-links-group {
  grid-column: span 1;
}

.footer-grid--single {
  grid-template-columns: 1fr;
}

.footer-grid--single .footer-contact {
  text-align: center;
}

.footer-grid--single .footer-social {
  justify-content: center;
}

.footer-grid--empty {
  display: none;
}

.footer-bottom--only {
  border-top: none;
  padding-top: 0;
  margin-top: 0;
}

@media (max-width: 768px) {
  .footer-grid,
  .footer-grid--2col,
  .footer-grid--single {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
  
  .footer-grid--single .footer-contact {
    text-align: left;
  }
  
  .footer-grid--single .footer-social {
    justify-content: flex-start;
  }
}

.footer-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-3);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 280px;
}

.footer-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  margin-bottom: var(--space-3);
  object-fit: cover;
  border: 2px solid var(--border);
}

.footer-friends {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-friends a {
  font-size: 14px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-friends a:hover {
  color: var(--text-primary);
}

.footer-social {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.footer-link {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-tertiary);
  text-decoration: none;
  border-radius: 4px;
  transition: var(--transition-fast);
  font-size: 18px;
}

.footer-link:hover {
  color: var(--text-primary);
  background: var(--bg-secondary);
}

.footer-bottom {
  text-align: center;
}

.footer-copyright {
  font-size: 13px;
  color: var(--text-tertiary);
}

.footer-text {
  font-size: 13px;
  color: var(--text-tertiary);
}

.footer-links {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* ----------------------------------------
   Back to Top
   ---------------------------------------- */
.back-to-top {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  width: 40px;
  height: 40px;
  border-radius: 6px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition: var(--transition-base);
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
}

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

.back-to-top:hover {
  border-color: var(--border-strong);
  color: var(--text-primary);
}

/* ----------------------------------------
   Loading & Empty States
   ---------------------------------------- */
.loading-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-16) var(--space-6);
  color: var(--text-tertiary);
}

.spinner {
  width: 32px;
  height: 32px;
  border: 2px solid var(--border);
  border-top-color: var(--text-secondary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-bottom: var(--space-4);
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.empty-state {
  text-align: center;
  padding: var(--space-16) var(--space-6);
}

.empty-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--space-4);
  background: var(--bg-secondary);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: var(--text-tertiary);
}

.empty-state h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.empty-state p {
  font-size: 14px;
  color: var(--text-secondary);
}

/* ----------------------------------------
   Load More
   ---------------------------------------- */
.load-more-container {
  text-align: center;
  margin-top: var(--space-8);
}

.load-more-container.hidden {
  display: none;
}

.load-more-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition-fast);
}

.load-more-btn:hover {
  border-color: var(--border-strong);
  color: var(--text-primary);
}

/* ----------------------------------------
   Reduced Motion
   ---------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}