/* ============================================
   ErrorsDoc — Design System
   Theme: Tech Troubleshoot (Sky Blue + Slate)
   Fonts: Poppins (Headlines) + Nunito (Body)
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Fira+Code:wght@400;500&family=Nunito:ital,wght@0,400;0,600;0,700;1,400&family=Poppins:wght@500;600;700&display=swap');

/* --- Tokens --- */
:root {
  --clr-main: #0ea5e9;
  --clr-main-dark: #0284c7;
  --clr-dark: #1e293b;
  --clr-warn: #f59e0b;
  --clr-warn-light: #fef3c7;
  --clr-bg: #f8fafc;
  --clr-surface: #ffffff;
  --clr-text: #1e293b;
  --clr-text-muted: #64748b;
  --clr-border: #e2e8f0;
  --clr-code-bg: #0f172a;
  --clr-code-text: #22d3ee;
  --clr-success: #10b981;
  --clr-danger: #ef4444;
  --ff-head: 'Poppins', sans-serif;
  --ff-body: 'Nunito', sans-serif;
  --ff-code: 'Fira Code', 'Consolas', 'Monaco', monospace;
  --wrap: 1140px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --gap: 1.5rem;
}

/* --- Reset --- */
*,*::before,*::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
img, svg { display: block; max-width: 100%; height: auto; }
a { color: var(--clr-main); text-decoration: none; transition: opacity .2s; }
a:hover { opacity: .8; }
ul, ol { list-style: none; }
button { font: inherit; cursor: pointer; border: none; background: none; }

/* --- Base Typography --- */
body {
  font-family: var(--ff-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--clr-text);
  background: var(--clr-bg);
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4 { font-family: var(--ff-head); line-height: 1.25; color: var(--clr-dark); }
h1 { font-size: 2.25rem; font-weight: 700; margin-bottom: 1rem; }
h2 { font-size: 1.625rem; font-weight: 600; margin-top: 2.5rem; margin-bottom: .75rem; }
h3 { font-size: 1.25rem; font-weight: 600; margin-top: 1.75rem; margin-bottom: .5rem; }
h4 { font-size: 1.1rem; font-weight: 600; margin-top: 1.25rem; margin-bottom: .5rem; }
p { margin-bottom: 1rem; }
strong { font-weight: 700; }

/* --- Layout --- */
.wrap {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* --- Masthead (Header) --- */
.masthead {
  background: var(--clr-dark);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 3px solid var(--clr-main);
}
.masthead .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  display: flex;
  align-items: center;
  gap: .5rem;
  color: #fff;
  font-family: var(--ff-head);
  font-weight: 700;
  font-size: 1.35rem;
}
.brand img {
  width: 36px;
  height: 36px;
}
.brand span { color: var(--clr-main); }

/* Top Nav */
.topnav { display: flex; align-items: center; gap: .25rem; }
.topnav a {
  color: #cbd5e1;
  font-size: .9rem;
  font-weight: 600;
  padding: .5rem .75rem;
  border-radius: var(--radius-sm);
  transition: color .2s, background .2s;
}
.topnav a:hover, .topnav a.active {
  color: #fff;
  background: rgba(255,255,255,.08);
  opacity: 1;
}

/* Dropdown */
.dropdown { position: relative; }
.dropdown-trigger {
  color: #cbd5e1;
  font-size: .9rem;
  font-weight: 600;
  padding: .5rem .75rem;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: .3rem;
  cursor: pointer;
  transition: color .2s, background .2s;
}
.dropdown-trigger:hover { color: #fff; background: rgba(255,255,255,.08); }
.dropdown-trigger svg { width: 12px; height: 12px; fill: currentColor; }
.dropdown-menu {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  min-width: 200px;
  padding: .5rem 0;
  box-shadow: 0 4px 16px rgba(0,0,0,.12);
  z-index: 110;
}
.dropdown:hover .dropdown-menu,
.dropdown.open .dropdown-menu { display: block; }
.dropdown-menu a {
  display: block;
  padding: .5rem 1rem;
  color: var(--clr-text);
  font-size: .875rem;
  transition: background .15s;
}
.dropdown-menu a:hover { background: var(--clr-bg); opacity: 1; }

/* Hamburger */
.ham-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: .5rem;
}
.ham-btn i {
  display: block;
  width: 22px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: transform .25s, opacity .25s;
}
.ham-btn.active i:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.ham-btn.active i:nth-child(2) { opacity: 0; }
.ham-btn.active i:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* --- Breadcrumbs --- */
.crumbs {
  background: var(--clr-surface);
  border-bottom: 1px solid var(--clr-border);
  padding: .6rem 0;
  font-size: .8rem;
}
.crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: .3rem;
  align-items: center;
}
.crumbs li::after { content: "›"; margin-left: .3rem; color: var(--clr-text-muted); }
.crumbs li:last-child::after { display: none; }
.crumbs a { color: var(--clr-text-muted); }
.crumbs a:hover { color: var(--clr-main); opacity: 1; }
.crumbs .current { color: var(--clr-text); font-weight: 600; }

/* --- Hero Banner --- */
.hero-banner {
  background: linear-gradient(135deg, var(--clr-dark) 0%, #0f172a 100%);
  color: #fff;
  position: relative;
  overflow: hidden;
  padding: 3.5rem 0 3rem;
  text-align: center;
}
.hero-banner .wrap { position: relative; z-index: 1; }
.hero-banner h1 { color: #fff; font-size: 2.5rem; margin-bottom: .75rem; }
.hero-banner p { color: #94a3b8; font-size: 1.125rem; max-width: 640px; margin: 0 auto; }

/* --- Article Layout --- */
.article-wrap {
  max-width: 800px;
  margin: 2rem auto;
  padding: 0 1.25rem;
}
.article-hero {
  width: 100%;
  border-radius: var(--radius-md);
  margin-bottom: 1.5rem;
  aspect-ratio: 16/9;
  object-fit: cover;
}
.article-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  color: var(--clr-text-muted);
  font-size: .85rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--clr-border);
}
.article-meta time { display: flex; align-items: center; gap: .3rem; }
.article-body h2 { border-bottom: 2px solid var(--clr-main); padding-bottom: .35rem; }
.article-body ul, .article-body ol { margin: .75rem 0 1.25rem 1.5rem; }
.article-body ul { list-style: disc; }
.article-body ol { list-style: decimal; }
.article-body li { margin-bottom: .4rem; }
.article-body a { color: var(--clr-main); font-weight: 600; border-bottom: 1px solid transparent; }
.article-body a:hover { border-bottom-color: var(--clr-main); opacity: 1; }
.article-body img { border-radius: var(--radius-sm); margin: 1.5rem 0; }
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.25rem 0;
  font-size: .9rem;
}
.article-body th, .article-body td {
  padding: .6rem .75rem;
  text-align: left;
  border: 1px solid var(--clr-border);
}
.article-body th { background: var(--clr-bg); font-weight: 700; }

/* --- Error Code Box (Terminal Look) --- */
.error-box {
  background: var(--clr-code-bg);
  color: var(--clr-code-text);
  font-family: var(--ff-code);
  font-size: .875rem;
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius-md);
  margin: 1.5rem 0;
  overflow-x: auto;
  border-left: 4px solid var(--clr-danger);
  position: relative;
}
.error-box::before {
  content: "ERROR";
  position: absolute;
  top: .5rem;
  right: .75rem;
  font-size: .65rem;
  font-weight: 500;
  color: var(--clr-danger);
  letter-spacing: .08em;
  opacity: .7;
}
.error-box code { color: #e2e8f0; }
.error-box .hl { color: var(--clr-warn); font-weight: 500; }

/* Inline code */
code {
  font-family: var(--ff-code);
  font-size: .85em;
  background: #e2e8f0;
  padding: .15em .4em;
  border-radius: 3px;
  color: var(--clr-dark);
}
pre {
  background: var(--clr-code-bg);
  color: #e2e8f0;
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: 1.25rem 0;
  font-size: .875rem;
  line-height: 1.6;
}
pre code { background: none; padding: 0; color: inherit; font-size: inherit; }

/* --- Quick Fix Box --- */
.quickfix {
  background: var(--clr-warn-light);
  border: 1px solid var(--clr-warn);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
}
.quickfix-title {
  font-family: var(--ff-head);
  font-weight: 600;
  font-size: 1rem;
  color: #92400e;
  margin-bottom: .5rem;
  display: flex;
  align-items: center;
  gap: .4rem;
}
.quickfix p:last-child { margin-bottom: 0; }

/* --- Step-by-Step Guide --- */
.steps { margin: 1.5rem 0; counter-reset: step-counter; }
.step {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
  align-items: flex-start;
}
.step-num {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  background: var(--clr-main);
  color: #fff;
  font-family: var(--ff-head);
  font-weight: 700;
  font-size: .9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  margin-top: .15rem;
}
.step-content { flex: 1; }
.step-content h4 { margin-top: 0; font-size: 1.05rem; }
.step-content p:last-child { margin-bottom: 0; }

/* --- FAQ Accordion --- */
.faq { margin: 2rem 0; }
.faq-item { border-bottom: 1px solid var(--clr-border); }
.faq-q {
  width: 100%;
  text-align: left;
  padding: 1rem 0;
  font-family: var(--ff-head);
  font-weight: 600;
  font-size: 1rem;
  color: var(--clr-text);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  cursor: pointer;
  transition: color .2s;
}
.faq-q:hover { color: var(--clr-main); }
.faq-q::after {
  content: "+";
  font-size: 1.25rem;
  font-weight: 400;
  flex-shrink: 0;
  width: 24px;
  text-align: center;
  transition: transform .25s;
  color: var(--clr-text-muted);
}
.faq-item.open .faq-q::after { content: "−"; }
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height .3s ease;
}
.faq-a-inner { padding: 0 0 1rem; color: var(--clr-text-muted); line-height: 1.65; }
.faq-item.open .faq-a { max-height: 600px; }

/* --- Cards (Category Listing) --- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap);
  margin: 2rem 0;
}
.card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: border-color .2s;
}
.card:hover { border-color: var(--clr-main); }
.category-hero {
  margin-bottom: 1.5rem;
  border-radius: 8px;
  overflow: hidden;
}
.category-hero img {
  width: 100%;
  height: 250px;
  object-fit: cover;
  display: block;
  border-radius: 8px;
}
.hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .18;
  z-index: 0;
}
.card-thumb {
  width: 100%;
  overflow: hidden;
  border-radius: 4px 4px 0 0;
}
.card-thumb img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  display: block;
}
.card-body { padding: 1rem 1.15rem 1.25rem; }
.card-body h3 {
  font-size: 1rem;
  margin: 0 0 .4rem;
  line-height: 1.35;
}
.card-body h3 a { color: var(--clr-dark); }
.card-body h3 a:hover { color: var(--clr-main); opacity: 1; }
.card-body p {
  font-size: .85rem;
  color: var(--clr-text-muted);
  margin-bottom: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.card-tag {
  display: inline-block;
  font-size: .7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--clr-main);
  background: rgba(14,165,233,.08);
  padding: .2rem .5rem;
  border-radius: 3px;
  margin-bottom: .5rem;
}

/* Category Card (for homepage) */
.cat-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-sm);
  padding: 1.5rem;
  transition: border-color .2s;
}
.cat-card:hover { border-color: var(--clr-main); }
.cat-card h3 { margin: 0 0 .5rem; }
.cat-card h3 a { color: var(--clr-dark); font-size: 1.1rem; }
.cat-card h3 a:hover { color: var(--clr-main); opacity: 1; }
.cat-card-count {
  font-size: .8rem;
  color: var(--clr-text-muted);
  margin-bottom: .75rem;
}
.cat-card ul { margin: 0; }
.cat-card li { margin-bottom: .3rem; }
.cat-card li a { font-size: .875rem; color: var(--clr-main); }

/* Featured Grid (homepage hero area) */
.featured-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap);
  margin: 2rem 0;
}

/* Error Link Cards (homepage error code grid) */
.error-link-card {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  padding: 1.15rem 1.25rem;
  background: var(--clr-code-bg);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--clr-danger);
  transition: border-color .2s, transform .15s;
}
.error-link-card:hover { border-left-color: var(--clr-main); opacity: 1; }
.error-link-card code {
  font-family: var(--ff-code);
  font-size: .95rem;
  font-weight: 500;
  color: var(--clr-code-text);
  background: none;
  padding: 0;
}
.error-link-card span {
  font-size: .8rem;
  color: #64748b;
}

/* --- Info / Tip / Warning Boxes --- */
.infobox {
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  margin: 1.25rem 0;
  font-size: .925rem;
}
.infobox-tip {
  background: #ecfdf5;
  border-left: 4px solid var(--clr-success);
}
.infobox-warn {
  background: var(--clr-warn-light);
  border-left: 4px solid var(--clr-warn);
}
.infobox-danger {
  background: #fef2f2;
  border-left: 4px solid var(--clr-danger);
}
.infobox p:last-child { margin-bottom: 0; }

/* --- Related Articles --- */
.related {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 2px solid var(--clr-border);
}
.related h2 { border-bottom: none; margin-top: 0; }
.related-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}
.related-link {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .75rem 1rem;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-sm);
  color: var(--clr-text);
  font-size: .9rem;
  font-weight: 600;
  transition: border-color .2s;
}
.related-link:hover { border-color: var(--clr-main); color: var(--clr-main); opacity: 1; }
.related-link::before {
  content: "→";
  color: var(--clr-main);
  font-size: 1.1rem;
  flex-shrink: 0;
}

/* --- Base Footer --- */
.base-footer {
  background: var(--clr-dark);
  color: #94a3b8;
  margin-top: 4rem;
  padding: 3rem 0 1.5rem;
}
.ft-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}
.ft-about { max-width: 280px; }
.ft-about .brand { margin-bottom: .75rem; }
.ft-about p { font-size: .85rem; line-height: 1.6; }
.ft-heading {
  font-family: var(--ff-head);
  font-weight: 600;
  font-size: .85rem;
  color: #e2e8f0;
  text-transform: uppercase;
  letter-spacing: .06em;
  margin-bottom: .75rem;
}
.ft-links li { margin-bottom: .4rem; }
.ft-links a { color: #94a3b8; font-size: .85rem; transition: color .2s; }
.ft-links a:hover { color: var(--clr-main); opacity: 1; }
.ft-bottom {
  border-top: 1px solid rgba(255,255,255,.08);
  padding-top: 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: .8rem;
}
.ft-bottom a { color: #94a3b8; }
.ft-bottom a:hover { color: #fff; opacity: 1; }
.ft-legal { display: flex; gap: 1.25rem; }

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  font-family: var(--ff-head);
  font-weight: 600;
  font-size: .9rem;
  padding: .6rem 1.25rem;
  border-radius: var(--radius-sm);
  transition: background .2s, opacity .2s;
}
.btn-main {
  background: var(--clr-main);
  color: #fff;
}
.btn-main:hover { background: var(--clr-main-dark); opacity: 1; }
.btn-outline {
  border: 1px solid var(--clr-main);
  color: var(--clr-main);
  background: transparent;
}
.btn-outline:hover { background: rgba(14,165,233,.06); opacity: 1; }

/* --- Section Spacing --- */
.section { padding: 3rem 0; }
.section-title {
  font-size: 1.625rem;
  margin-bottom: 1.5rem;
  text-align: center;
}

/* --- Pagination --- */
.pagination {
  display: flex;
  justify-content: center;
  gap: .5rem;
  margin: 2.5rem 0;
}
.pagination a, .pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 38px;
  height: 38px;
  font-size: .875rem;
  font-weight: 600;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-sm);
  color: var(--clr-text);
  transition: border-color .2s, background .2s;
}
.pagination a:hover { border-color: var(--clr-main); color: var(--clr-main); opacity: 1; }
.pagination .active {
  background: var(--clr-main);
  color: #fff;
  border-color: var(--clr-main);
}

/* --- Search Decorative --- */
.search-box {
  display: flex;
  max-width: 480px;
  margin: 1.5rem auto 0;
}
.search-box input {
  flex: 1;
  padding: .65rem 1rem;
  font-family: var(--ff-body);
  font-size: .95rem;
  border: 2px solid rgba(255,255,255,.15);
  border-right: none;
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
  background: rgba(255,255,255,.08);
  color: #fff;
  outline: none;
  transition: border-color .2s;
}
.search-box input::placeholder { color: #64748b; }
.search-box input:focus { border-color: var(--clr-main); }
.search-box button {
  padding: .65rem 1.25rem;
  background: var(--clr-main);
  color: #fff;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-weight: 600;
  transition: background .2s;
}
.search-box button:hover { background: var(--clr-main-dark); }

/* --- Skip Nav --- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  background: var(--clr-main);
  color: #fff;
  padding: .5rem 1rem;
  border-radius: var(--radius-sm);
  z-index: 200;
  font-weight: 600;
}
.skip-link:focus { top: .5rem; }

/* ========== RESPONSIVE ========== */

@media (max-width: 992px) {
  .card-grid, .featured-grid { grid-template-columns: repeat(2, 1fr); }
  .ft-grid { grid-template-columns: repeat(2, 1fr); }
  .related-list { grid-template-columns: 1fr; }
  h1 { font-size: 1.85rem; }
}

@media (max-width: 768px) {
  .ham-btn { display: flex; }

  .topnav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--clr-dark);
    flex-direction: column;
    padding: .75rem 1.25rem 1rem;
    border-top: 1px solid rgba(255,255,255,.06);
    gap: 0;
  }
  .topnav.open { display: flex; }
  .topnav a { padding: .65rem 0; display: block; width: 100%; }
  .dropdown-menu {
    position: static;
    box-shadow: none;
    background: rgba(255,255,255,.04);
    border: none;
    border-radius: 0;
    padding: 0 0 0 1rem;
    display: none;
  }
  .dropdown.open .dropdown-menu { display: block; }
  .dropdown-menu a { color: #cbd5e1; padding: .5rem 0; }

  .card-grid, .featured-grid { grid-template-columns: 1fr; }
  .ft-grid { grid-template-columns: 1fr; }
  .ft-bottom { flex-direction: column; gap: .75rem; text-align: center; }

  h1 { font-size: 1.6rem; }
  h2 { font-size: 1.35rem; }
  .hero-banner { padding: 2.5rem 0 2rem; }
  .hero-banner h1 { font-size: 1.75rem; }
  .article-wrap { padding: 0 1rem; }
  .step { gap: .75rem; }
  .step-num { width: 30px; height: 30px; font-size: .8rem; }
}

@media (max-width: 480px) {
  .wrap { padding: 0 .75rem; }
  .masthead .wrap { padding: 0 .75rem; }
  h1 { font-size: 1.4rem; }
  .search-box { flex-direction: column; }
  .search-box input { border-right: 2px solid rgba(255,255,255,.15); border-radius: var(--radius-sm); }
  .search-box button { border-radius: var(--radius-sm); margin-top: .5rem; }
}

/* Cross-category links on category pages */
.related-categories { margin-top: 3rem; padding-top: 2rem; border-top: 1px solid var(--clr-border); }
.related-categories h2 { font-size: 1.3rem; margin-bottom: 1rem; color: var(--clr-heading); }
.related-cat-grid { display: flex; flex-wrap: wrap; gap: .75rem; }
.related-cat-link {
  display: inline-block;
  padding: .5rem 1.25rem;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-sm);
  color: var(--clr-main);
  font-weight: 500;
  font-size: .95rem;
  transition: background .2s, border-color .2s;
  text-decoration: none;
}
.related-cat-link:hover { background: var(--clr-main); color: #fff; border-color: var(--clr-main); }
.card-grid.compact .card { min-height: auto; }
.card-grid.compact .card .card-body { padding: .75rem 1rem; }