/* 
 * Enterprise CRM Insights - Minimal Vintage & Editorial Design System
 * Aesthetic: Pure, Lean, Minimalist Editorial, White Background, Serif & Clean Sans Typography
 */

@import url('https://fonts.googleapis.com/css2?family=Newsreader:ital,opsz,wght@0,6..72,400;0,6..72,500;0,6..72,600;0,6..72,700;1,6..72,400&family=Plus+Jakarta+Sans:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  /* Minimal Vintage Palette */
  --bg-main: #ffffff;
  --bg-surface: #ffffff;
  --bg-subtle: #f7f7f5;
  
  --border-color: #e5e5e0;
  --border-dark: #111111;

  --text-main: #111111;
  --text-muted: #555555;
  --text-subtle: #888888;

  --accent-ink: #111111;
  --accent-warm: #8c6d52;

  /* Typography */
  --font-serif: 'Newsreader', Georgia, Cambria, "Times New Roman", Times, serif;
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Layout */
  --max-width: 1200px;
  --article-width: 740px;
  --header-height: 70px;
}

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

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

body {
  background-color: var(--bg-main);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--text-main);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--accent-warm);
}

/* Container */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  width: 100%;
}

/* Header & Clean Navigation */
.navbar {
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-surface);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.navbar .container {
  height: var(--header-height);
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
}

.logo {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-main);
  white-space: nowrap;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-link {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 0.25rem 0;
  white-space: nowrap;
}

.nav-link:hover, .nav-link.active {
  color: var(--text-main);
  font-weight: 700;
  border-bottom: 2px solid var(--text-main);
}

/* Mobile Hamburger Button */
.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 18px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  margin-left: auto;
  z-index: 1001;
}

.mobile-toggle span {
  width: 100%;
  height: 2px;
  background-color: var(--text-main);
  transition: transform 0.25s ease, opacity 0.25s ease;
  transform-origin: left center;
}

.mobile-toggle.open span:nth-child(1) {
  transform: rotate(45deg);
}

.mobile-toggle.open span:nth-child(2) {
  opacity: 0;
}

.mobile-toggle.open span:nth-child(3) {
  transform: rotate(-45deg);
}

/* ADVERTISMENT STYLES (4 Dedicated Placements) */
.ad-slot-container {
  text-align: center;
  margin: 1.5rem auto;
  max-width: var(--max-width);
  width: 100%;
}

.ad-slot-container.in-article {
  max-width: var(--article-width);
  margin: 2rem auto;
}

.ad-label {
  display: block;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-subtle);
  margin-bottom: 0.35rem;
  font-family: var(--font-sans);
}

.ad-placeholder {
  background: var(--bg-subtle);
  border: 1px dashed var(--border-color);
  padding: 1.25rem;
  display: inline-block;
  min-width: 300px;
  max-width: 100%;
}

.ad-content-box {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
  padding: 0.5rem 1rem;
}

/* Slot 4: Sticky Anchor Ad at Screen Bottom */
.ad-anchor-sticky {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: #ffffff;
  border-top: 1px solid var(--border-color);
  z-index: 9999;
  padding: 0.5rem 1rem;
  text-align: center;
  box-shadow: 0 -4px 20px rgba(0,0,0,0.06);
}

.ad-anchor-sticky .ad-close-btn {
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  width: 26px;
  height: 26px;
  border-radius: 50%;
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
  color: var(--text-main);
}

.ad-placeholder-anchor {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* Filter & Search Bar */
.filter-section {
  padding: 1.75rem 0 1.25rem;
  margin-bottom: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.filter-pills {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.filter-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 0.4rem 0.9rem;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
}

.filter-btn:hover, .filter-btn.active {
  background: var(--text-main);
  color: #fff;
  border-color: var(--text-main);
}

.search-box {
  position: relative;
  min-width: 240px;
}

.search-input {
  width: 100%;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 0.45rem 0.9rem 0.45rem 2rem;
  font-family: inherit;
  font-size: 0.85rem;
  color: var(--text-main);
  outline: none;
}

.search-input:focus {
  border-color: var(--text-main);
}

.search-icon {
  position: absolute;
  left: 0.65rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-subtle);
  font-size: 0.8rem;
}

/* Clean Posts Grid */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-bottom: 4rem;
}

.article-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.article-card:hover {
  border-color: var(--text-main);
  transform: translateY(-2px);
}

.card-content {
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.card-category {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-warm);
  margin-bottom: 0.6rem;
}

.card-title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 600;
  line-height: 1.25;
  margin-bottom: 0.85rem;
  color: var(--text-main);
}

.card-excerpt {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.78rem;
  color: var(--text-subtle);
  padding-top: 0.85rem;
  border-top: 1px solid var(--border-color);
  font-family: var(--font-mono);
}

/* Article Page Layout */
.article-header {
  padding: 2.5rem 0 1.75rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 2.5rem;
  max-width: var(--article-width);
  margin-left: auto;
  margin-right: auto;
}

.article-category {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-warm);
  font-weight: 700;
  margin-bottom: 0.75rem;
  display: block;
}

.article-h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin-bottom: 1.25rem;
  color: var(--text-main);
}

.article-byline {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  flex-wrap: wrap;
  column-gap: 0.6rem;
  row-gap: 0.3rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-family: var(--font-sans);
}

.article-byline span.dot {
  color: var(--text-subtle);
  font-size: 0.75rem;
}

.article-body {
  max-width: var(--article-width);
  margin: 0 auto 4rem;
  font-size: 1.08rem;
  line-height: 1.8;
  color: #222222;
}

.article-body p {
  margin-bottom: 1.6rem;
}

.article-body h2 {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--text-main);
  margin: 2.5rem 0 1.1rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-color);
}

.article-body h3 {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text-main);
  margin: 1.8rem 0 0.85rem;
}

.article-body ul, .article-body ol {
  margin-bottom: 1.6rem;
  padding-left: 1.4rem;
}

.article-body li {
  margin-bottom: 0.4rem;
}

.article-body blockquote {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-style: italic;
  line-height: 1.5;
  border-left: 3px solid var(--text-main);
  padding: 0.4rem 0 0.4rem 1.25rem;
  margin: 2rem 0;
  color: var(--text-main);
}

.table-wrapper {
  overflow-x: auto;
  margin: 2rem 0;
  border: 1px solid var(--border-color);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.85rem;
}

.data-table th {
  background: var(--bg-subtle);
  color: var(--text-main);
  padding: 0.75rem 0.9rem;
  font-weight: 700;
  font-family: var(--font-sans);
  text-transform: uppercase;
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border-color);
}

.data-table td {
  padding: 0.75rem 0.9rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-muted);
}

pre {
  background: #111111;
  color: #f4f4f5;
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  overflow-x: auto;
  margin: 1.75rem 0;
  border-radius: 4px;
}

code {
  font-family: var(--font-mono);
  background: var(--bg-subtle);
  padding: 0.15rem 0.35rem;
  font-size: 0.88em;
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

pre code {
  background: none;
  padding: 0;
  border: none;
  color: inherit;
}

.author-box {
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  padding: 1.5rem 0;
  margin: 3.5rem 0 2.5rem;
  display: flex;
  gap: 1.25rem;
  align-items: center;
}

.author-avatar-initials {
  width: 46px;
  height: 46px;
  background: var(--text-main);
  color: #fff;
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.author-details h4 {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  color: var(--text-main);
}

.author-details p {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-color);
  background: var(--bg-surface);
  padding: 2.5rem 0;
  margin-top: auto;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.2rem;
}

.footer-nav {
  display: flex;
  gap: 1.2rem;
  list-style: none;
  flex-wrap: wrap;
}

.footer-nav a {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-muted);
}

.footer-nav a:hover {
  color: var(--text-main);
}

/* Mobile Responsiveness & Breakpoints */
@media (max-width: 900px) {
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .mobile-toggle {
    display: flex;
    margin-left: auto;
  }

  nav {
    display: contents;
  }

  .nav-links {
    display: none;
    position. absolute;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background: var(--bg-surface);
    flex-direction: column;
    align-items: flex-start;
    padding: 1.25rem 1.5rem;
    gap: 1.2rem;
    border-bottom: 2px solid var(--text-main);
    box-shadow: 0 10px 25px rgba(0,0,0,0.08);
  }

  .nav-links.active {
    display: flex;
  }

  .nav-link {
    font-size: 1rem;
    width: 100%;
    padding: 0.4rem 0;
  }

  .articles-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .filter-section {
    flex-direction: column;
    align-items: stretch;
  }

  .search-box {
    width: 100%;
  }

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