/* ==========================================================================
   Regalis Capital Learning Center - Style Sheet
   Mobile-first responsive design. Lato font throughout.
   ========================================================================== */

/* ---------- CSS Custom Properties ---------- */
:root {
  --color-navy: #002950;
  --color-footer-navy: #003467e6;
  --color-yellow: #fcd981;
  --color-green: #9ae6b4;
  --color-green-light: #D1FADF;
  --color-white: #ffffff;
  --color-link: #188bf6;
  --color-gray-light: #f8f9fa;
  --color-text: #222222;
  --color-text-light: #555555;
  --color-border: #e0e0e0;

  --font-family: 'Lato', sans-serif;
  --container-max: 1170px;
  --article-max: 750px;
}

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

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

body {
  font-family: var(--font-family);
  font-weight: 400;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-white);
}

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

a:hover {
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
}

ul, ol {
  list-style: none;
}

address {
  font-style: normal;
}

/* ---------- Skip Link (Accessibility) ---------- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  z-index: 2000;
  padding: 12px 20px;
  background: var(--color-navy);
  color: var(--color-white);
  font-weight: 700;
  font-size: 14px;
  text-decoration: none;
}

.skip-link:focus {
  top: 8px;
}

/* ---------- Focus States (Accessibility) ---------- */
*:focus-visible {
  outline: 3px solid var(--color-link);
  outline-offset: 2px;
}

/* Dark background elements need a lighter focus ring */
.site-header *:focus-visible,
.mobile-nav-overlay *:focus-visible,
.cta-section *:focus-visible,
.hero *:focus-visible {
  outline-color: var(--color-yellow);
}

/* Buttons and links that already have visual hover states */
.header-cta:focus-visible,
.mobile-nav-cta:focus-visible,
.cta-button:focus-visible,
.page-link:focus-visible,
.filter-pill:focus-visible {
  outline: 3px solid var(--color-link);
  outline-offset: 2px;
}

/* ---------- Container ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- Header ---------- */
.site-header {
  background: var(--color-navy);
  padding: 0;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 70px;
}

.header-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.header-logo:hover {
  text-decoration: none;
}

.header-logo-img {
  height: 40px;
  width: auto;
}

.header-nav {
  display: none;
  align-items: center;
  gap: 0;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 0;
}

.nav-list li a {
  display: block;
  color: var(--color-white);
  font-size: 15px;
  font-weight: 400;
  padding: 8px 16px;
  border: 1px solid black;
  text-decoration: none;
  transition: background 0.2s, color 0.2s;
}

.nav-list li a:hover,
.nav-list li a.nav-active {
  background: black;
  color: var(--color-white);
  text-decoration: none;
}

.header-cta {
  display: inline-block;
  background: var(--color-yellow);
  color: var(--color-navy);
  font-weight: 700;
  font-size: 15px;
  padding: 10px 20px;
  border: none;
  text-decoration: none;
  transition: opacity 0.2s;
}

.header-cta:hover {
  opacity: 0.85;
  text-decoration: none;
}

/* ---------- Hamburger ---------- */
.hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.hamburger-line {
  display: block;
  width: 100%;
  height: 3px;
  background: var(--color-white);
  transition: transform 0.2s;
}

/* ---------- Mobile Nav Overlay ---------- */
.mobile-nav-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.85);
  z-index: 1000;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s;
}

.mobile-nav-overlay.is-open {
  opacity: 1;
  visibility: visible;
}

.mobile-nav-content {
  background: var(--color-navy);
  width: 100%;
  min-height: 100vh;
  padding: 30px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.mobile-nav-close {
  align-self: flex-end;
  background: none;
  border: none;
  color: var(--color-white);
  font-size: 36px;
  cursor: pointer;
  line-height: 1;
  margin-bottom: 30px;
}

.mobile-nav-list {
  width: 100%;
  text-align: center;
}

.mobile-nav-list li {
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}

.mobile-nav-list li a {
  display: block;
  color: var(--color-white);
  font-size: 20px;
  padding: 16px 0;
  text-decoration: none;
}

.mobile-nav-list li a:hover {
  text-decoration: none;
  opacity: 0.8;
}

.mobile-nav-cta {
  display: inline-block;
  background: var(--color-yellow);
  color: var(--color-navy);
  font-weight: 700;
  font-size: 18px;
  padding: 15px 30px;
  border: 2px solid var(--color-green);
  text-decoration: none;
  margin-top: 30px;
}

.mobile-nav-cta:hover {
  text-decoration: none;
  opacity: 0.85;
}

/* ---------- Hero Section ---------- */
.hero {
  background: var(--color-navy);
  color: var(--color-white);
  padding: 60px 0;
  text-align: center;
}

.hero h1 {
  font-size: 32px;
  margin-bottom: 16px;
}

.hero-subtitle {
  font-size: 18px;
  max-width: 650px;
  margin: 0 auto;
  opacity: 0.9;
  line-height: 1.6;
}

/* ---------- Category Filter ---------- */
.category-filter {
  background: var(--color-white);
  padding: 30px 0 10px;
  border-bottom: 1px solid var(--color-border);
}

.filter-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}

.filter-pill {
  display: inline-block;
  padding: 8px 20px;
  font-size: 14px;
  font-weight: 700;
  color: var(--color-navy);
  background: var(--color-gray-light);
  border: 1px solid var(--color-border);
  text-decoration: none;
  transition: background 0.2s, color 0.2s;
}

.filter-pill:hover,
.filter-pill.active {
  background: var(--color-navy);
  color: var(--color-white);
  border-color: var(--color-navy);
  text-decoration: none;
}

/* ---------- Article Card Grid ---------- */
.article-listing {
  padding: 50px 0 60px;
}

.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
}

.article-card {
  display: block;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  padding: 28px 24px;
  text-decoration: none;
  color: var(--color-text);
  transition: border-color 0.2s;
}

.article-card:hover {
  border-color: var(--color-navy);
  text-decoration: none;
}

.article-card h2,
.article-card h3 {
  font-size: 20px;
  margin: 12px 0 10px;
  color: var(--color-navy);
  line-height: 1.35;
}

.article-card p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 14px;
}

.card-meta {
  display: flex;
  gap: 16px;
  font-size: 13px;
  color: var(--color-text-light);
}

/* ---------- Category Tag ---------- */
.category-tag {
  display: inline-block;
  background: var(--color-green-light);
  color: var(--color-navy);
  font-size: 12px;
  font-weight: 700;
  padding: 4px 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ---------- Pagination ---------- */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin-top: 50px;
  padding-top: 30px;
  border-top: 1px solid var(--color-border);
}

.page-link {
  display: inline-block;
  padding: 10px 20px;
  font-size: 15px;
  font-weight: 700;
  color: var(--color-navy);
  border: 1px solid var(--color-navy);
  text-decoration: none;
  transition: background 0.2s, color 0.2s;
}

.page-link:hover {
  background: var(--color-navy);
  color: var(--color-white);
  text-decoration: none;
}

.page-link.disabled {
  color: #aaa;
  border-color: #ddd;
  cursor: default;
  pointer-events: none;
}

.page-info {
  font-size: 14px;
  color: var(--color-text-light);
}

/* ---------- Breadcrumbs ---------- */
.breadcrumbs {
  background: var(--color-gray-light);
  padding: 14px 0;
  border-bottom: 1px solid var(--color-border);
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  font-size: 14px;
}

.breadcrumb-list li {
  display: flex;
  align-items: center;
}

.breadcrumb-list li::after {
  content: ">";
  margin: 0 10px;
  color: #999;
}

.breadcrumb-list li:last-child::after {
  display: none;
}

.breadcrumb-list li:last-child {
  color: var(--color-text-light);
}

.breadcrumb-list a {
  color: var(--color-link);
}

/* ---------- Category Header ---------- */
.category-header {
  padding: 50px 0 30px;
  border-bottom: 1px solid var(--color-border);
}

.category-header h1 {
  font-size: 32px;
  color: var(--color-navy);
}

/* ---------- Article Page ---------- */
.article-header {
  padding: 40px 0 30px;
}

.article-container {
  max-width: var(--article-max);
}

/* On desktop, when TOC sidebar is present, the parent needs full container width.
   The article-body itself gets constrained instead. See desktop breakpoint. */

.article-header h1 {
  font-size: 34px;
  color: var(--color-navy);
  margin: 14px 0 18px;
  line-height: 1.25;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-text-light);
}

.meta-separator {
  color: #ccc;
}

/* ---------- Table of Contents (Collapsible) ---------- */
.toc-collapsible {
  background: var(--color-gray-light);
  border-left: 4px solid var(--color-navy);
  margin-bottom: 30px;
}

.toc-toggle {
  display: block;
  padding: 16px 24px;
  font-size: 16px;
  font-weight: 700;
  color: var(--color-navy);
  cursor: pointer;
  list-style: none;
  user-select: none;
}

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

.toc-toggle::before {
  content: "\25B6";
  display: inline-block;
  margin-right: 10px;
  font-size: 12px;
  transition: transform 0.2s;
}

.toc-collapsible[open] .toc-toggle::before {
  transform: rotate(90deg);
}

.toc-collapsible nav {
  padding: 0 24px 16px;
}

.toc-list {
  list-style: decimal;
  padding-left: 20px;
}

.toc-list li {
  margin-bottom: 8px;
}

.toc-list li a {
  font-size: 15px;
  color: var(--color-link);
}

/* ---------- Article Body ---------- */
.article-body {
  font-size: 17px;
  line-height: 1.8;
}

.article-body h2 {
  font-size: 26px;
  color: var(--color-navy);
  margin: 40px 0 16px;
  padding-top: 10px;
}

.article-body h3 {
  font-size: 21px;
  color: var(--color-navy);
  margin: 30px 0 12px;
}

.article-body h4 {
  font-size: 18px;
  color: var(--color-navy);
  margin: 24px 0 10px;
}

.article-body p {
  margin-bottom: 18px;
}

.article-body ul,
.article-body ol {
  padding-left: 28px;
  margin-bottom: 18px;
}

.article-body ul {
  list-style: disc;
}

.article-body ol {
  list-style: decimal;
}

.article-body li {
  margin-bottom: 8px;
}

.article-body blockquote {
  border-left: 4px solid var(--color-navy);
  padding: 16px 24px;
  margin: 24px 0;
  background: var(--color-gray-light);
  font-style: italic;
  color: var(--color-text-light);
}

.article-body a {
  color: var(--color-link);
  text-decoration: underline;
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 15px;
}

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

.article-body th {
  background: var(--color-navy);
  color: var(--color-white);
  font-weight: 700;
}

.article-body tr:nth-child(even) {
  background: var(--color-gray-light);
}

.article-body code {
  background: var(--color-gray-light);
  padding: 2px 6px;
  font-size: 0.9em;
}

.article-body pre {
  background: #1a1a2e;
  color: #e0e0e0;
  padding: 20px 24px;
  overflow-x: auto;
  margin: 24px 0;
  font-size: 14px;
  line-height: 1.5;
}

.article-body pre code {
  background: none;
  padding: 0;
  font-size: inherit;
}

.article-body img {
  margin: 24px 0;
}

.article-body hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 40px 0;
}

/* ---------- Related Articles ---------- */
.related-articles {
  background: var(--color-gray-light);
  padding: 60px 0;
  margin-top: 50px;
}

.related-articles h2 {
  font-size: 26px;
  color: var(--color-navy);
  margin-bottom: 30px;
  text-align: center;
}

/* ---------- CTA Section ---------- */
.cta-section {
  background: var(--color-navy);
  color: var(--color-white);
  padding: 70px 0;
  text-align: center;
}

.cta-inner h2 {
  font-size: 30px;
  margin-bottom: 18px;
}

.cta-inner p {
  font-size: 17px;
  max-width: 620px;
  margin: 0 auto 30px;
  opacity: 0.9;
  line-height: 1.7;
}

.cta-button {
  display: inline-block;
  background: var(--color-yellow);
  color: var(--color-navy);
  font-weight: 700;
  font-size: 17px;
  padding: 15px 20px;
  border: none;
  text-decoration: none;
  transition: opacity 0.2s;
}

.cta-button:hover {
  opacity: 0.85;
  text-decoration: none;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-footer-navy);
  color: var(--color-white);
  padding: 40px 0;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  text-align: center;
}

.footer-logo-img {
  height: 32px;
  width: auto;
}

.footer-address {
  font-size: 14px;
  opacity: 0.8;
}

.footer-copy {
  font-size: 13px;
  opacity: 0.7;
}

.footer-copy a {
  color: var(--color-link);
}

/* ---------- 404 Page ---------- */
.error-page {
  padding: 80px 0;
  text-align: center;
}

.error-page h1 {
  font-size: 40px;
  color: var(--color-navy);
  margin-bottom: 16px;
}

.error-page p {
  font-size: 17px;
  color: var(--color-text-light);
  margin-bottom: 12px;
}

.recent-articles {
  margin-top: 50px;
  text-align: left;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.recent-articles h2 {
  font-size: 22px;
  color: var(--color-navy);
  margin-bottom: 20px;
}

.recent-list li {
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
}

.recent-list li a {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-navy);
  display: block;
  margin-bottom: 4px;
}

.recent-meta {
  font-size: 13px;
  color: var(--color-text-light);
}

/* ---------- Empty State ---------- */
.empty-state {
  text-align: center;
  padding: 60px 0;
}

.empty-state h2 {
  font-size: 24px;
  color: var(--color-navy);
  margin-bottom: 12px;
}

.empty-state p {
  color: var(--color-text-light);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */

/* ---------- Tablet (768px+) ---------- */
@media (min-width: 768px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero h1 {
    font-size: 40px;
  }

  .hero-subtitle {
    font-size: 20px;
  }

  .article-header h1 {
    font-size: 38px;
  }

  .cta-inner h2 {
    font-size: 34px;
  }

  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

/* ---------- Desktop (1024px+) ---------- */
@media (min-width: 1024px) {
  .card-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .hero {
    padding: 80px 0;
  }

  .hero h1 {
    font-size: 46px;
  }

  .article-header {
    padding: 50px 0 30px;
  }

  .article-header h1 {
    font-size: 42px;
  }

  .related-articles .card-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ==========================================================================
   Print Styles
   ========================================================================== */
@media print {
  .site-header,
  .hamburger,
  .mobile-nav-overlay,
  .category-filter,
  .cta-section,
  .site-footer,
  .toc-sidebar,
  .related-articles,
  .pagination,
  .breadcrumbs {
    display: none !important;
  }

  body {
    font-size: 12pt;
    color: #000;
    background: #fff;
  }

  .article-header h1 {
    font-size: 24pt;
  }

  .article-body {
    max-width: 100%;
  }

  .article-body a {
    color: #000;
    text-decoration: underline;
  }

  .article-body a::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    color: #555;
  }

  .article-card {
    break-inside: avoid;
    border: 1px solid #ccc;
  }
}