/* ==========================================
   atscheck.online - Master Style System
   Theme: Crisp White & Slate
   Mobile Responsive & Contrast Optimized
   ========================================== */

:root {
  /* Color Tokens */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --bg-card: #ffffff;
  
  --text-primary: #0f172a;   /* Deep Slate Navy - High Contrast */
  --text-secondary: #334155; /* Medium Dark Slate */
  --text-muted: #64748b;     /* Muted Label */
  
  --accent-primary: #0ea5e9; /* Tech Cyan / Blue */
  --accent-dark: #0284c7;
  --accent-light: #f0f9ff;
  
  --success-bg: #ecfdf5;
  --success-border: #a7f3d0;
  --success-text: #065f46;
  
  --danger-bg: #fef2f2;
  --danger-border: #fecaca;
  --danger-text: #991b1b;
  
  --warning-bg: #fffbeb;
  --warning-border: #fde68a;
  --warning-text: #92400e;

  --info-bg: #f0f9ff;
  --info-border: #bae6fd;
  --info-text: #075985;
  
  --border-color: #e2e8f0;
  --border-subtle: #f1f5f9;
  
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 12px 24px -4px rgba(0, 0, 0, 0.08);
  
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 10px;
  
  /* Typography */
  --font-sinhala: 'Noto Sans Sinhala', 'Iskoola Pota', 'Abhaya Libre', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-english: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --line-height-body: 1.65;
}

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

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

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sinhala);
  font-size: 1.05rem;
  line-height: var(--line-height-body);
  letter-spacing: normal;
  word-spacing: normal;
  word-wrap: break-word;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Scroll Offset for Anchors */
[id] {
  scroll-margin-top: 80px;
}

/* Reading Progress Bar */
.reading-progress-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: var(--border-subtle);
  z-index: 1000;
}

.reading-progress-bar {
  height: 100%;
  background-color: var(--accent-primary);
  width: 0%;
  transition: width 0.1s ease-out;
}

/* Header & Navbar */
.site-header {
  position: sticky;
  top: 0;
  background-color: #ffffff;
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 2px 10px rgba(15, 23, 42, 0.08);
  z-index: 1000;
}

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand-logo {
  text-decoration: none;
  font-family: var(--font-english);
  font-weight: 800;
  font-size: 1.3rem;
  color: var(--text-primary);
  letter-spacing: -0.3px;
  white-space: nowrap;
  flex-shrink: 0;
}

.brand-logo .logo-dot {
  color: var(--accent-primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.9rem;
  white-space: nowrap;
  transition: color 0.15s ease;
}

.nav-links a:hover {
  color: var(--accent-primary);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  background-color: var(--accent-primary);
  color: #ffffff !important;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: background-color 0.15s ease;
  white-space: nowrap;
  flex-shrink: 0;
  border: 1px solid transparent;
  max-width: 100%;
}

.btn-primary:hover {
  background-color: var(--accent-dark);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  background-color: var(--bg-primary);
  color: var(--text-primary) !important;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius-md);
  text-decoration: none;
  border: 1px solid var(--border-color);
  transition: all 0.15s ease;
}

.btn-secondary:hover {
  border-color: var(--accent-primary);
  color: var(--accent-dark) !important;
}

.btn-text-mobile {
  display: none;
}

/* Layout Containers */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

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

.article-container {
  max-width: 780px;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

/* Centered Hero Section */
.hero-section {
  padding: 3.5rem 1.25rem 2.75rem;
  background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
  border-bottom: 1px solid var(--border-color);
}

.hero-title {
  font-size: 2rem;
  line-height: 1.28;
  font-weight: 800;
  color: var(--text-primary);
  max-width: 800px;
  margin: 0 auto 1rem;
  letter-spacing: normal;
}

@media (min-width: 768px) {
  .hero-title {
    font-size: 2.6rem;
    line-height: 1.3;
  }
}

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 650px;
  margin: 0 auto 1.75rem;
  line-height: 1.6;
  letter-spacing: normal;
}

.hero-cta-group {
  display: flex;
  gap: 0.875rem;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
}

/* Horizontal List View Layout for Articles */
.article-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin: 1.75rem 0 3.5rem;
}

.article-list-item {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  transition: all 0.2s ease;
  text-decoration: none;
}

.article-list-item:hover {
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.article-thumb-box {
  width: 180px;
  height: 130px;
  border-radius: var(--radius-md);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  overflow: hidden;
  padding: 0.5rem;
}

.article-thumb-box svg {
  width: 100%;
  height: 100%;
}

.article-list-content {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.card-category {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-primary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 0.35rem;
  display: block;
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--text-primary);
  margin-bottom: 0.45rem;
}

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

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

.card-excerpt {
  font-size: 0.925rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 0.75rem;
}

.card-footer-meta {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.card-link {
  font-weight: 600;
  color: var(--accent-dark);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  margin-left: auto;
}

.card-link:hover {
  text-decoration: underline;
}

/* Mobile Responsive List Layout */
@media (max-width: 680px) {
  .article-list-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
    padding: 1rem;
  }
  
  .article-thumb-box {
    width: 100%;
    height: 140px;
  }

  .card-title {
    font-size: 1.1rem;
  }

  .card-footer-meta {
    width: 100%;
    justify-content: space-between;
  }
}

/* Call to Action Banner */
.cta-banner {
  background-color: var(--text-primary);
  color: #ffffff;
  border-radius: var(--radius-lg);
  padding: 2.25rem 1.25rem;
  text-align: center;
  margin: 3rem 0;
  overflow: hidden;
}

.cta-banner h3 {
  color: #ffffff;
  font-size: 1.35rem;
  font-weight: 800;
  line-height: 1.35;
  margin-bottom: 0.6rem;
}

.cta-banner p {
  color: #e2e8f0 !important;
  max-width: 580px;
  margin: 0 auto 1.35rem;
  font-size: 0.975rem;
  line-height: 1.6;
}

.cta-banner .btn-primary {
  background-color: #ffffff !important;
  color: #0f172a !important;
  padding: 0.65rem 1.25rem;
  font-size: 0.95rem;
  white-space: normal;
  text-align: center;
  line-height: 1.4;
}

/* Footer Styling */
.site-footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 2.5rem 1.25rem 1.75rem;
  margin-top: 3.5rem;
}

.footer-grid {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

.footer-brand p {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-top: 0.4rem;
}

.footer-col h5 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.6rem;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.footer-col a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color 0.15s ease;
}

.footer-col a:hover {
  color: var(--accent-primary);
}

.footer-bottom {
  max-width: 1100px;
  margin: 0 auto;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-color);
  text-align: center;
  font-size: 0.825rem;
  color: var(--text-muted);
}

/* Article Page Typography Specifics */
.article-lead {
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--text-secondary);
  background-color: var(--bg-secondary);
  padding: 1.25rem;
  border-radius: var(--radius-md);
  border-left: 3px solid var(--accent-primary);
  margin-bottom: 1.75rem;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  list-style: none;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

.breadcrumb a { color: var(--text-muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--text-primary); }

.article-header { margin-bottom: 1.75rem; }
.article-category { font-size: 0.775rem; font-weight: 700; color: var(--accent-primary); text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 0.4rem; display: block; }
.article-title { font-size: 1.6rem; line-height: 1.35; font-weight: 800; color: var(--text-primary); margin-bottom: 0.875rem; }
@media (min-width: 768px) { .article-title { font-size: 2.2rem; } }

.article-meta { display: flex; align-items: center; gap: 1rem; font-size: 0.85rem; color: var(--text-muted); border-bottom: 1px solid var(--border-color); padding-bottom: 0.875rem; flex-wrap: wrap; }
.meta-item { display: flex; align-items: center; gap: 0.3rem; white-space: nowrap; }

.toc-box { background-color: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: var(--radius-md); padding: 1.1rem 1.25rem; margin: 1.5rem 0; }
.toc-title { font-size: 1rem; font-weight: 700; color: var(--text-primary); margin-bottom: 0.6rem; }
.toc-list { list-style: none; display: flex; flex-direction: column; gap: 0.4rem; }
.toc-list a { color: var(--text-secondary); text-decoration: none; font-size: 0.925rem; line-height: 1.5; }
.toc-list a:hover { color: var(--accent-primary); text-decoration: underline; }

.callout { padding: 1rem 1.15rem; border-radius: var(--radius-md); margin: 1.35rem 0; display: flex; gap: 0.75rem; align-items: flex-start; }
.callout-icon { font-size: 1.25rem; line-height: 1; flex-shrink: 0; margin-top: 0.15rem; }
.callout-content { font-size: 0.95rem; line-height: 1.65; }
.callout-tip { background-color: var(--success-bg); border: 1px solid var(--success-border); color: var(--success-text); }
.callout-danger { background-color: var(--danger-bg); border: 1px solid var(--danger-border); color: var(--danger-text); }

.process-workflow { display: flex; flex-direction: column; gap: 0.875rem; margin: 1.5rem 0; }
.workflow-step { display: flex; align-items: flex-start; gap: 0.875rem; background-color: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: var(--radius-md); padding: 1rem; }
.step-number { width: 32px; height: 32px; border-radius: var(--radius-sm); background-color: var(--accent-primary); color: #ffffff; font-family: var(--font-english); font-weight: 700; font-size: 0.95rem; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.step-details h4 { font-size: 1rem; font-weight: 700; color: var(--text-primary); margin-bottom: 0.2rem; }
.step-details p { font-size: 0.925rem; margin-bottom: 0; color: var(--text-secondary); }

.visual-diagram-box { background-color: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: var(--radius-lg); padding: 1.25rem 0.875rem; margin: 1.5rem 0; text-align: center; overflow-x: auto; }
.table-responsive { width: 100%; overflow-x: auto; margin: 1.5rem 0; border: 1px solid var(--border-color); border-radius: var(--radius-md); }
.custom-table { width: 100%; min-width: 500px; border-collapse: collapse; text-align: left; font-size: 0.925rem; }
.custom-table th { background-color: var(--bg-tertiary); color: var(--text-primary); font-weight: 700; padding: 0.75rem 1rem; border-bottom: 1px solid var(--border-color); }
.custom-table td { padding: 0.65rem 1rem; border-bottom: 1px solid var(--border-color); color: var(--text-secondary); }

.article-content h2 { font-size: 1.35rem; line-height: 1.35; font-weight: 800; color: var(--text-primary); margin: 2rem 0 0.875rem; padding-bottom: 0.35rem; border-bottom: 1px solid var(--border-color); }
@media (min-width: 768px) { .article-content h2 { font-size: 1.55rem; } }
.article-content p { margin-bottom: 1.15rem; color: var(--text-secondary); line-height: 1.65; }

/* Clean & Responsive Lists Typography */
.article-content ul,
.article-content ol {
  margin: 1.25rem 0 1.5rem;
  padding-left: 1.75rem;
}

.article-content li {
  margin-bottom: 0.65rem;
  line-height: 1.65;
  color: var(--text-secondary);
  padding-left: 0.25rem;
}

.article-content li strong {
  color: var(--text-primary);
}

.faq-section { margin: 2.25rem 0; }
.faq-item { border: 1px solid var(--border-color); border-radius: var(--radius-md); margin-bottom: 0.75rem; background-color: var(--bg-card); overflow: hidden; }
.faq-question { width: 100%; text-align: left; background: none; border: none; padding: 1rem 1.15rem; font-family: var(--font-sinhala); font-size: 1rem; font-weight: 700; color: var(--text-primary); cursor: pointer; display: flex; align-items: center; justify-content: space-between; gap: 0.875rem; }
.faq-answer { padding: 0 1.15rem 1rem; color: var(--text-secondary); line-height: 1.65; font-size: 0.95rem; }

.author-card { display: flex; align-items: center; gap: 1rem; background-color: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: var(--radius-md); padding: 1.15rem; margin: 2.25rem 0; }
.author-avatar { width: 44px; height: 44px; border-radius: var(--radius-md); background-color: var(--text-primary); color: #ffffff; display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 1rem; flex-shrink: 0; }
.author-info h4 { font-size: 0.975rem; font-weight: 700; color: var(--text-primary); margin-bottom: 0.15rem; }
.author-info p { font-size: 0.875rem; color: var(--text-muted); margin-bottom: 0; }

/* Mobile Responsive & Navigation Drawer */
.menu-toggle-btn {
  display: none;
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.4rem 0.65rem;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  align-items: center;
  gap: 0.35rem;
  transition: all 0.15s ease;
  z-index: 1000;
  pointer-events: auto;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.menu-toggle-btn:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

/* Mobile Slide-out Drawer */
.drawer-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(15, 23, 42, 0.5);
  backdrop-filter: blur(3px);
  z-index: 1001;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.drawer-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

.mobile-drawer {
  position: fixed;
  top: 0;
  left: 0;
  width: 290px;
  max-width: 82vw;
  height: 100vh;
  background: #ffffff;
  z-index: 1002;
  transform: translateX(-100%);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
  box-shadow: 4px 0 24px rgba(0, 0, 0, 0.15);
}

.mobile-drawer.active {
  transform: translateX(0);
}

.drawer-header {
  padding: 1.1rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.drawer-close-btn {
  background: none;
  border: none;
  font-size: 1.4rem;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.2rem;
  line-height: 1;
  transition: color 0.15s ease;
}

.drawer-close-btn:hover {
  color: var(--danger-text);
}

.drawer-body {
  padding: 1.25rem;
  flex-grow: 1;
  overflow-y: auto;
}

.drawer-nav {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.drawer-nav a {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 0.85rem;
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.975rem;
  transition: all 0.15s ease;
}

.drawer-nav a:hover, .drawer-nav a.active {
  background: var(--bg-secondary);
  color: var(--accent-primary);
}

.drawer-footer {
  padding: 1.25rem;
  border-top: 1px solid var(--border-color);
  background: var(--bg-secondary);
}

@media (max-width: 992px) {
  .menu-toggle-btn { display: inline-flex; }
  .nav-links { display: none; }
  .btn-text-desktop { display: none; }
  .btn-text-mobile { display: inline; }
  .btn-primary { padding: 0.45rem 0.85rem; font-size: 0.85rem; }
}

@media (max-width: 768px) {
  .article-container {
    padding: 1.25rem 1.15rem 3.5rem;
  }
  .article-content ul,
  .article-content ol {
    padding-left: 1.85rem;
  }
  .article-content li {
    padding-left: 0.15rem;
  }
  .visual-diagram-box {
    padding: 1rem 0.5rem;
  }
}