/* blog.css - Notion Design System */

/* ========================================
   Notion Design System
   - Font: Inter (Google Fonts)
   - Colors: Warm White, Near-Black, Notion Blue
   - Whisper Border: 1px solid rgba(0,0,0,0.1)
   - Multi-layer shadows (4-5 layer low opacity stack)
   - 8px base spacing system
   - Generous vertical rhythm (64-120px)
   ======================================== */

/* Google Fonts - Inter */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

/* CSS Variables - Notion Design System 2025 */
:root {
  --notion-bg: #f7f6f3;           /* Updated: Notion's current warm white */
  --notion-surface: #ffffff;      /* Pure white for cards/surface */
  --notion-text-primary: rgba(0, 0, 0, 0.95);   /* Near-black for headings */
  --notion-text-secondary: rgba(0, 0, 0, 0.65); /* Medium gray for body */
  --notion-text-tertiary: rgba(0, 0, 0, 0.45);  /* Light gray for captions */
  --notion-blue: #0075de;         /* Notion's signature blue */
  --notion-blue-hover: #005fb8;   /* Darker blue for hover states */
  --notion-border: rgba(0, 0, 0, 0.08);     /* Whisper borders */
  --notion-border-hover: rgba(0, 0, 0, 0.15);
  /* Multi-layer shadow stack for depth */
  --notion-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --notion-shadow: 
    0 1px 2px rgba(0, 0, 0, 0.02),
    0 2px 4px rgba(0, 0, 0, 0.02),
    0 4px 8px rgba(0, 0, 0, 0.02),
    0 8px 16px rgba(0, 0, 0, 0.02),
    0 16px 32px rgba(0, 0, 0, 0.02);
  --notion-shadow-hover:
    0 2px 4px rgba(0, 0, 0, 0.04),
    0 4px 8px rgba(0, 0, 0, 0.04),
    0 8px 16px rgba(0, 0, 0, 0.04),
    0 16px 32px rgba(0, 0, 0, 0.04),
    0 32px 64px rgba(0, 0, 0, 0.04);
  --notion-radius: 4px;           /* Subtle 4px radius */
  --notion-radius-lg: 8px;        /* Larger radius for cards */
  --notion-max-width: 1200px;     /* Content max-width */
  --notion-content-width: 720px;
  --notion-sidebar-width: 320px;
  --header-height: 72px;
  /* Spacing system (8px base) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  line-height: 1.6;
  color: var(--notion-text-primary);
  background-color: var(--notion-bg);
}

/* Skip Link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--notion-blue);
  color: #ffffff;
  padding: 8px 16px;
  z-index: 1001;
  font-weight: 600;
  transition: top 0.2s;
}

.skip-link:focus {
  top: 0;
}

/* ========================================
   Header (Same structure as main index.html)
   ======================================== */
.header {
  background: var(--notion-surface);
  border-bottom: 1px solid var(--notion-border);
  padding: 0;
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-container {
  max-width: var(--notion-max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: var(--header-height);
}

.logo {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.logo-main {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--notion-text-primary);
  letter-spacing: -0.02em;
}

.logo-sub {
  font-size: 0.75rem;
  color: var(--notion-text-secondary);
  font-weight: 500;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 32px;
  align-items: center;
}

.nav-menu a {
  color: var(--notion-text-secondary);
  font-weight: 500;
  font-size: 0.9375rem;
  padding: 8px 0;
  transition: color 0.2s;
}

.nav-menu a:hover {
  color: var(--notion-blue);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--notion-text-primary);
  transition: all 0.2s;
  border-radius: 2px;
}

/* Mobile Menu */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }
  
  .nav-menu {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--notion-surface);
    flex-direction: column;
    gap: 0;
    padding: 16px 24px;
    border-bottom: 1px solid var(--notion-border);
    display: none;
  }
  
  .nav-menu.active {
    display: flex;
  }
  
  .nav-menu li {
    padding: 12px 0;
    border-bottom: 1px solid var(--notion-border);
  }
  
  .nav-menu li:last-child {
    border-bottom: none;
  }
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
  background: var(--notion-surface);
  border-bottom: 1px solid var(--notion-border);
  padding: 80px 24px;
  text-align: center;
}

.hero-content {
  max-width: 720px;
  margin: 0 auto;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  color: var(--notion-text-primary);
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--notion-text-secondary);
  line-height: 1.6;
}

.hero-subtitle a {
  color: var(--notion-blue);
}

/* ========================================
   Search Section
   ======================================== */
.search-section {
  background: var(--notion-bg);
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--notion-border);
}

.search-container {
  max-width: 600px;
  margin: 0 auto;
}

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

.search-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  padding-right: 48px;
  border: 1px solid var(--notion-border);
  border-radius: var(--notion-radius);
  font-size: 0.9375rem;
  font-family: inherit;
  background: var(--notion-surface);
  color: var(--notion-text-primary);
  transition: all 0.2s;
}

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

.search-input:focus {
  outline: none;
  border-color: var(--notion-blue);
  box-shadow: 0 0 0 3px rgba(0, 117, 222, 0.1);
}

.search-button {
  position: absolute;
  right: 12px;
  background: none;
  border: none;
  color: var(--notion-text-tertiary);
  cursor: pointer;
  padding: var(--space-2);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.2s;
}

.search-button:hover {
  color: var(--notion-blue);
}

.search-no-results {
  text-align: center;
  padding: var(--space-8) var(--space-5);
  color: var(--notion-text-secondary);
  font-size: 1rem;
  display: none;
}

.search-no-results.visible {
  display: block;
}

.blog-card.hidden {
  display: none;
}

/* ========================================
   Main Layout - 2 Column
   ======================================== */
.blog-container {
  display: grid;
  grid-template-columns: 1fr var(--notion-sidebar-width);
  gap: 48px;
  max-width: var(--notion-max-width);
  margin: 0 auto;
  padding: 64px 24px;
  align-items: start;
}

.blog-list {
  min-width: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-5);
}

@media (max-width: 880px) {
  .blog-list {
    grid-template-columns: 1fr;
  }
}

/* ========================================
   Blog Cards - Notion Style 2025
   ======================================== */
.blog-card {
  background: var(--notion-surface);
  border: 1px solid var(--notion-border);
  border-radius: var(--notion-radius);
  overflow: hidden;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  box-shadow: var(--notion-shadow);
  height: 100%;
}

.blog-card:hover {
  border-color: var(--notion-border-hover);
  box-shadow: var(--notion-shadow-hover);
  transform: translateY(-4px);
}

.blog-card a {
  color: inherit;
  text-decoration: none;
}

.blog-thumbnail {
  width: 100%;
  height: 200px;
  object-fit: cover;
  display: block;
  background: var(--notion-bg);
}

.blog-content {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.blog-content h2 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--notion-text-primary);
  line-height: 1.4;
  letter-spacing: -0.02em;
  margin: 0 0 8px;
}

.blog-content h2 a {
  color: inherit;
}

.blog-content h2 a:hover {
  color: var(--notion-blue);
}

.blog-content time {
  font-size: 0.875rem;
  color: var(--notion-text-tertiary);
  margin-bottom: 12px;
  font-weight: 500;
}

.article-summary {
  font-size: 0.9375rem;
  color: var(--notion-text-secondary);
  line-height: 1.6;
  margin: 0 0 16px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}

.read-more {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--notion-blue);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: color 0.2s;
}

.read-more:hover {
  color: var(--notion-blue-hover);
}

/* Tags */
.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: var(--space-4) 0;
}

.article-tag {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  background: var(--notion-bg);
  border: 1px solid var(--notion-border);
  border-radius: var(--notion-radius);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--notion-text-secondary);
  transition: all 0.2s;
}

.article-tag:hover {
  border-color: var(--notion-blue);
  color: var(--notion-blue);
}

/* ========================================
   Article Detail Page
   ======================================== */
.container {
  display: grid;
  grid-template-columns: 1fr var(--notion-sidebar-width);
  gap: var(--space-6);
  max-width: var(--notion-max-width);
  margin: 0 auto;
  padding: var(--space-7) var(--space-5);
  align-items: start;
}

.main-content {
  min-width: 0;
}

.main-content article {
  background: var(--notion-surface);
  border: 1px solid var(--notion-border);
  border-radius: var(--notion-radius);
  overflow: hidden;
}

.blog-hero-image {
  width: 100%;
  height: auto;
  max-height: 420px;
  object-fit: cover;
  display: block;
  background: var(--notion-bg);
}

.article-content {
  padding: 40px 48px;
  color: var(--notion-text-primary);
  line-height: 1.8;
  font-size: 1rem;
}

.article-content h1 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--notion-text-primary);
  margin: 0 0 24px;
  letter-spacing: -0.03em;
  line-height: 1.3;
}

.article-content h2 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--notion-text-primary);
  margin: 48px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--notion-border);
  letter-spacing: -0.02em;
}

.article-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--notion-text-primary);
  margin: 32px 0 12px;
  letter-spacing: -0.02em;
}

.article-content h4 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--notion-text-primary);
  margin: 24px 0 12px;
}

.article-content p {
  margin-bottom: 20px;
  color: var(--notion-text-primary);
}

.article-content a {
  color: var(--notion-blue);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.article-content a:hover {
  color: var(--notion-blue-hover);
}

.article-content ul,
.article-content ol {
  margin: 20px 0 20px 24px;
  padding: 0;
}

.article-content li {
  color: var(--notion-text-primary);
  margin-bottom: 8px;
  line-height: 1.7;
}

.article-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--notion-radius);
  margin: 24px 0;
  border: 1px solid var(--notion-border);
}

.article-content blockquote {
  border-left: 3px solid var(--notion-blue);
  margin: 24px 0;
  padding: 16px 16px 16px 20px;
  color: var(--notion-text-secondary);
  font-style: italic;
  background: var(--notion-bg);
  border-radius: 0 var(--notion-radius) var(--notion-radius) 0;
}

.article-content strong {
  color: var(--notion-text-primary);
  font-weight: 600;
}

.article-content code {
  background: var(--notion-bg);
  padding: 2px 6px;
  border-radius: 3px;
  font-family: 'SF Mono', 'Monaco', 'Inconsolata', monospace;
  font-size: 0.875em;
}

.article-content pre {
  background: var(--notion-bg);
  padding: 16px;
  border-radius: var(--notion-radius);
  overflow-x: auto;
  margin: 24px 0;
  border: 1px solid var(--notion-border);
}

.article-content pre code {
  background: none;
  padding: 0;
}

/* Highlight Box */
.highlight-box,
.data-reference {
  background: var(--notion-bg);
  border: 1px solid var(--notion-border);
  border-radius: var(--notion-radius);
  padding: 20px 24px;
  margin: 24px 0;
}

.highlight-box h3,
.data-reference h3 {
  margin-top: 0;
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--notion-text-primary);
}

/* TOC in Content */
.toc-container {
  background: var(--notion-bg);
  border: 1px solid var(--notion-border);
  border-radius: var(--notion-radius);
  padding: 20px 24px;
  margin: 24px 0;
}

.toc-container summary {
  cursor: pointer;
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--notion-text-primary);
  list-style: none;
}

.toc-container summary::-webkit-details-marker {
  display: none;
}

.toc-list {
  margin: 16px 0 0;
  padding-left: 20px;
}

.toc-list li {
  margin: 8px 0;
  color: var(--notion-text-secondary);
}

.toc-list .toc-sub {
  margin-left: 16px;
  font-size: 0.875rem;
}

.toc-list a {
  color: var(--notion-blue);
  text-decoration: none;
}

.toc-list a:hover {
  text-decoration: underline;
}

/* ========================================
   Article Content Styles
   ======================================== */
.article-content {
  background: var(--notion-surface);
  border: 1px solid var(--notion-border);
  border-radius: var(--notion-radius);
  padding: var(--space-6) var(--space-5);
  margin-bottom: var(--space-5);
  box-shadow: var(--notion-shadow);
}

.article-content h1 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--notion-text-primary);
  margin: 0 0 var(--space-4);
  line-height: 1.3;
}

.article-content h2 {
  font-size: 1.375rem;
  font-weight: 600;
  color: var(--notion-text-primary);
  margin: var(--space-6) 0 var(--space-3);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--notion-border);
}

.article-content h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--notion-text-primary);
  margin: var(--space-5) 0 var(--space-3);
}

.article-content p {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--notion-text-secondary);
  margin-bottom: var(--space-4);
}

.article-content ul,
.article-content ol {
  margin-bottom: var(--space-4);
  padding-left: var(--space-5);
}

.article-content li {
  margin-bottom: var(--space-2);
  line-height: 1.7;
  color: var(--notion-text-secondary);
}

.article-content a {
  color: var(--notion-blue);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}

.article-content a:hover {
  border-bottom-color: var(--notion-blue);
}

.article-content strong {
  color: var(--notion-text-primary);
  font-weight: 600;
}

.article-content blockquote {
  border-left: 4px solid var(--notion-blue);
  background: var(--notion-bg);
  padding: var(--space-4) var(--space-5);
  margin: var(--space-5) 0;
  border-radius: 0 var(--notion-radius) var(--notion-radius) 0;
  font-style: italic;
  color: var(--notion-text-secondary);
}

.article-content code {
  background: var(--notion-bg);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: 'SF Mono', 'Monaco', 'Inconsolata', monospace;
  font-size: 0.875em;
  color: var(--notion-text-primary);
}

.article-content pre {
  background: var(--notion-text-primary);
  color: var(--notion-surface);
  padding: var(--space-4);
  border-radius: var(--notion-radius);
  overflow-x: auto;
  margin: var(--space-4) 0;
}

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

.article-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--notion-radius);
  margin: var(--space-4) 0;
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-4) 0;
  font-size: 0.9375rem;
}

.article-content th,
.article-content td {
  padding: 12px 16px;
  text-align: left;
  border: 1px solid var(--notion-border);
}

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

.article-content td {
  color: var(--notion-text-secondary);
}

.article-content tr:nth-child(even) {
  background: var(--notion-bg);
}

/* Tags Global List */
.tags-global {
  background: var(--notion-surface);
  border: 1px solid var(--notion-border);
  border-radius: var(--notion-radius);
  padding: var(--space-5);
  box-shadow: var(--notion-shadow);
}

.tags-global h2 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--notion-text-primary);
  margin: 0 0 var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.global-tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.global-tags-list a {
  display: inline-block;
  padding: var(--space-2) var(--space-3);
  background: var(--notion-bg);
  border: 1px solid var(--notion-border);
  border-radius: 16px;
  color: var(--notion-text-secondary);
  font-size: 0.8125rem;
  transition: all 0.2s;
  text-decoration: none;
}

.global-tags-list a:hover {
  background: var(--notion-blue);
  border-color: var(--notion-blue);
  color: #ffffff;
}

/* Share Links */
.share-links {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--notion-border);
}

.share-links-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--notion-text-secondary);
  margin-bottom: 12px;
}

.share-buttons {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.share-buttons a {
  display: inline-block;
  padding: 8px 16px;
  border: 1px solid var(--notion-border);
  border-radius: var(--notion-radius);
  color: var(--notion-text-primary);
  font-size: 0.875rem;
  font-weight: 500;
  transition: all 0.2s;
  background: var(--notion-surface);
}

.share-buttons a:hover {
  border-color: var(--notion-blue);
  color: var(--notion-blue);
}

/* ========================================
   Sidebar - Enhanced 2025
   ======================================== */
.sidebar {
  position: sticky;
  top: calc(var(--header-height) + var(--space-5));
  align-self: start;
}

.sidebar-section {
  background: var(--notion-surface);
  border: 1px solid var(--notion-border);
  border-radius: var(--notion-radius);
  padding: var(--space-5);
  margin-bottom: var(--space-5);
  box-shadow: var(--notion-shadow);
  transition: box-shadow 0.2s ease;
}

.sidebar-section:hover {
  box-shadow: var(--notion-shadow-hover);
}

.sidebar-section h3 {
  font-size: 0.9375rem;
  font-weight: 600;
  margin: 0 0 16px;
  color: var(--notion-text-primary);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--notion-border);
  letter-spacing: -0.01em;
}

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

.sidebar-nav li {
  margin-bottom: 8px;
}

.sidebar-nav a {
  color: var(--notion-text-secondary);
  font-size: 0.875rem;
  text-decoration: none;
  transition: color 0.2s;
  display: block;
  padding: 4px 0;
}

.sidebar-nav a:hover {
  color: var(--notion-blue);
}

/* Sidebar Ads */
.sidebar-ad {
  padding: 16px;
  text-align: center;
}

.sidebar-ad .amazon-banner {
  background: var(--notion-bg);
  border: 1px solid var(--notion-border);
  border-radius: var(--notion-radius);
  padding: 12px;
}

.sidebar-ad .amazon-banner a {
  color: var(--notion-text-primary);
  font-weight: 600;
  font-size: 0.875rem;
}

.sidebar-ad img {
  max-width: 100%;
  border-radius: var(--notion-radius);
  transition: opacity 0.2s;
}

.sidebar-ad img:hover {
  opacity: 0.9;
}

/* ========================================
   Footer - Notion Style 2025
   ======================================== */
.footer {
  background: var(--notion-surface);
  border-top: 1px solid var(--notion-border);
  padding: var(--space-7) var(--space-5) var(--space-5);
  margin-top: var(--space-8);
}

.footer-ban {
  background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
  border: 1px solid #fbbf24;
  border-radius: var(--notion-radius);
  padding: var(--space-4);
  margin: 0 auto var(--space-6);
  max-width: var(--notion-max-width);
}

.footer-ban p {
  margin: 0;
  font-size: 0.8125rem;
  color: #92400e;
  text-align: center;
  line-height: 1.6;
}

.footer-ban strong {
  color: #78350f;
}

.footer-content {
  max-width: var(--notion-max-width);
  margin: 0 auto;
}

.footer-sections {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  margin-bottom: 32px;
}

.footer-section h4 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--notion-text-primary);
  margin: 0 0 16px;
  letter-spacing: -0.01em;
}

.footer-section ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-section li {
  margin-bottom: 8px;
}

.footer-section a {
  color: var(--notion-text-secondary);
  font-size: 0.875rem;
  text-decoration: none;
  transition: color 0.2s;
}

.footer-section a:hover {
  color: var(--notion-blue);
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid var(--notion-border);
  text-align: center;
}

.footer-bottom p {
  font-size: 0.8125rem;
  color: var(--notion-text-tertiary);
  margin: 0;
}

/* ========================================
   Responsive Design 2025
   ======================================== */
@media (max-width: 1080px) {
  .blog-container,
  .container {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
  
  .sidebar {
    position: static;
    order: 2;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-4);
  }
  
  .sidebar-section {
    margin-bottom: 0;
  }
  
  .blog-list,
  .main-content {
    order: 1;
  }
}

@media (max-width: 768px) {
  .hero {
    padding: var(--space-6) var(--space-4);
  }
  
  .hero-title {
    font-size: 1.75rem;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
  
  .blog-container,
  .container {
    gap: var(--space-5);
    padding: var(--space-5) var(--space-4);
  }
  
  .article-content {
    padding: var(--space-5) var(--space-4);
  }
  
  .article-content h1 {
    font-size: 1.5rem;
  }
  
  .article-content h2 {
    font-size: 1.25rem;
  }
  
  .blog-thumbnail {
    height: 180px;
  }
  
  .blog-content {
    padding: var(--space-4);
  }
  
  .blog-content h2 {
    font-size: 1.125rem;
  }
  
  .footer-sections {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-5);
  }
  
  .sidebar {
    grid-template-columns: 1fr;
  }
  
  .sidebar-section {
    padding: var(--space-4);
  }
}

@media (max-width: 480px) {
  .blog-container,
  .container {
    padding: var(--space-4) var(--space-3);
  }
  
  .header-container {
    padding: 0 var(--space-4);
  }
  
  .logo-main {
    font-size: 1.125rem;
  }
  
  .hero {
    padding: var(--space-5) var(--space-3);
  }
  
  .hero-title {
    font-size: 1.5rem;
  }
  
  .blog-thumbnail {
    height: 160px;
  }
  
  .blog-content h2 {
    font-size: 1.0625rem;
    line-height: 1.4;
  }
  
  .article-summary {
    font-size: 0.875rem;
    -webkit-line-clamp: 2;
  }
  
  .footer-sections {
    grid-template-columns: 1fr;
    gap: var(--space-5);
  }
  
  .share-buttons {
    justify-content: center;
  }
  
  .share-buttons a {
    padding: var(--space-2) var(--space-3);
    font-size: 0.8125rem;
  }
}

/* ========================================
   Scroll to Top Button
   ======================================== */
.scroll-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--notion-blue);
  color: #ffffff;
  border: none;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  font-size: 1.5rem;
  cursor: pointer;
  z-index: 100;
  display: none;
  font-weight: 700;
  transition: all 0.2s ease;
  box-shadow: var(--notion-shadow);
}

.scroll-to-top:hover {
  background: var(--notion-blue-hover);
  transform: translateY(-2px);
}

.scroll-to-top.visible {
  display: block;
}