/* NexUtility - Custom CSS | Flexbox + Grid | Mobile-first */

/* Light theme – neutral, controlled */
:root {
  --sidebar-width: 280px;
  --header-height: 64px;
  --color-bg: #F3F4F6;
  --color-surface: #FFFFFF;
  --color-border: #D1D5DB;
  --color-text: #111827;
  --color-text-muted: #6B7280;
  --color-accent: #4B4F6B;
  --color-accent-hover: #3F435F;
  --color-accent-tint: #E5E7EB;
  --font-sans: "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-mono: "Consolas", "Monaco", monospace;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --radius: 6px;
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --ad-min-gap: 280px;
}

/* Dark theme – slate palette when OS prefers dark */
@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) {
    --color-bg: #0F172A;
    --color-surface: #1E2235;
    --color-border: #30344F;
    --color-text: #E5E7EB;
    --color-text-muted: #9CA3AF;
    --color-accent: #6B728E;
    --color-accent-hover: #7B7FA0;
    --color-accent-tint: #24283F;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.2);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.25);
  }
}

[data-theme="light"] {
  --color-bg: #F3F4F6;
  --color-surface: #FFFFFF;
  --color-border: #D1D5DB;
  --color-text: #111827;
  --color-text-muted: #6B7280;
  --color-accent: #4B4F6B;
  --color-accent-hover: #3F435F;
  --color-accent-tint: #E5E7EB;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
}

[data-theme="dark"] {
  --color-bg: #0F172A;
  --color-surface: #1E2235;
  --color-border: #30344F;
  --color-text: #E5E7EB;
  --color-text-muted: #9CA3AF;
  --color-accent: #6B728E;
  --color-accent-hover: #7B7FA0;
  --color-accent-tint: #24283F;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.2);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.25);
}

*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
  min-height: 100vh;
  overflow-x: hidden;
}

body.sidebar-open { overflow: hidden; }

/* Site header – full viewport width, inner content contained (Utilify-style) */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  height: var(--header-height);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  z-index: 102;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
}

.site-header-inner {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: center;
}

.site-header nav {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  flex-wrap: wrap;
  justify-content: center;
}

.site-header a {
  color: var(--color-text);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius);
}

.site-header a:hover {
  color: var(--color-accent);
  background: var(--color-accent-tint, var(--color-bg));
}

.site-header .site-logo {
  font-weight: 600;
  margin-right: var(--space-md);
  display: flex;
  align-items: center;
}

.site-header .site-logo img {
  height: 36px;
  width: auto;
  max-width: 160px;
  object-fit: contain;
  vertical-align: middle;
}

.site-header .site-logo .logo-dark {
  display: none;
}

[data-theme="dark"] .site-header .site-logo .logo-light {
  display: none;
}

[data-theme="dark"] .site-header .site-logo .logo-dark {
  display: block;
}

@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) .site-header .site-logo .logo-light {
    display: none;
  }
  html:not([data-theme="light"]) .site-header .site-logo .logo-dark {
    display: block;
  }
}

/* Mobile: compact navbar so it fits in one row; scroll horizontally if needed */
@media (max-width: 768px) {
  .site-header-inner {
    padding: 0 var(--space-md);
    justify-content: flex-start;
  }
  .site-header nav {
    gap: var(--space-sm);
    flex-wrap: nowrap;
    justify-content: flex-start;
    min-width: 0;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding-right: var(--space-sm);
  }
  .site-header nav::-webkit-scrollbar {
    display: none;
  }
  .site-header a {
    padding: var(--space-xs) var(--space-sm);
    font-size: 0.875rem;
    white-space: nowrap;
    flex-shrink: 0;
  }
  .site-header .site-logo {
    margin-right: var(--space-sm);
    flex-shrink: 0;
  }
  .site-header .site-logo img {
    height: 28px;
  }
  .site-header .theme-toggle {
    width: 36px;
    height: 36px;
    margin-left: var(--space-xs);
    flex-shrink: 0;
  }
  .site-header .theme-toggle svg {
    width: 18px;
    height: 18px;
  }
}

/* Push sidebar and main below fixed header when header placeholder is present */
#site-header-placeholder ~ .sidebar {
  top: var(--header-height);
  height: calc(100vh - var(--header-height));
}

#site-header-placeholder ~ .main-content {
  padding-top: var(--header-height);
}

#site-header-placeholder ~ .sidebar-overlay {
  top: var(--header-height);
  height: calc(100vh - var(--header-height));
}

@media (max-width: 1023px) {
  #site-header-placeholder ~ .menu-toggle { top: calc(var(--header-height) + var(--space-sm)); }
  #site-header-placeholder ~ .main-content { padding-top: calc(var(--header-height) + var(--space-md)); }
}

/* Scroll margin so anchor targets aren't hidden under fixed header */
.main-content [id] {
  scroll-margin-top: calc(var(--header-height) + var(--space-md));
}

/* Category filter - tabs (All | Cat1 | Cat2 ...), one category visible at a time */
.category-filter {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-md) 0;
  margin-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border);
  font-size: 0.9375rem;
}

.category-tab {
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  color: var(--color-text-muted);
  font-size: inherit;
  font-family: inherit;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, color 0.15s;
}

.category-tab:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: var(--color-bg);
}

.category-tab.active {
  color: var(--color-accent);
  font-weight: 600;
  border-color: var(--color-accent);
  background: var(--color-accent-tint, rgba(16, 185, 129, 0.1));
}

/* Category index pages: filter as links (not tabs) */
.category-filter a,
.category-filter span.sep {
  color: var(--color-text-muted);
  text-decoration: none;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius);
}

.category-filter a:hover {
  color: var(--color-accent);
  background: var(--color-bg);
}

.category-filter span.active {
  color: var(--color-accent);
  font-weight: 600;
}

.category-filter .sep {
  color: var(--color-border);
  padding: 0;
  user-select: none;
}

/* Layout - Desktop */
.app-layout {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  z-index: 100;
  transition: transform 0.2s ease, visibility 0.2s;
}

.sidebar-header {
  flex-shrink: 0;
  padding: var(--space-md);
  border-bottom: 1px solid var(--color-border);
}

.sidebar-logo {
  font-weight: 600;
  font-size: 1.125rem;
  color: var(--color-text);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.sidebar-search-wrap {
  flex-shrink: 0;
  padding: var(--space-sm) var(--space-md);
  position: sticky;
  top: 0;
  background: var(--color-surface);
  z-index: 2;
}

.sidebar-search {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-family: inherit;
  background: var(--color-bg);
}

.sidebar-search::placeholder { color: var(--color-text-muted); }
.sidebar-search:focus {
  outline: none;
  border-color: var(--color-accent);
  background: var(--color-surface);
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-sm) 0;
}

.sidebar-category {
  margin-bottom: var(--space-xs);
}

.sidebar-category-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
  text-align: left;
}

.sidebar-category-title:hover { color: var(--color-text); }

.sidebar-category-title svg {
  transition: transform 0.2s ease;
}

.sidebar-category.collapsed .sidebar-category-title svg { transform: rotate(-90deg); }

.sidebar-category.collapsed .sidebar-tool-list { display: none; }

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

.sidebar-tool-list a {
  display: block;
  padding: var(--space-sm) var(--space-md) var(--space-sm) var(--space-lg);
  font-size: 0.875rem;
  color: var(--color-text);
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius);
  margin: 0 var(--space-sm) 2px var(--space-sm);
}

.sidebar-tool-list a:hover {
  background: var(--color-bg);
  border-color: var(--color-border);
}

.sidebar-tool-list a.active {
  color: var(--color-accent);
  font-weight: 600;
  border-color: var(--color-accent);
  background: var(--color-accent-tint, rgba(16, 185, 129, 0.1));
}

/* Main content */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

/* Home and category index: no sidebar, full-width content */
body.no-sidebar .sidebar,
body.no-sidebar .sidebar-overlay,
body.no-sidebar .menu-toggle {
  display: none !important;
}

body.no-sidebar .main-content {
  margin-left: 0;
}

.main-inner {
  flex: 1;
  padding: var(--space-lg);
  max-width: 1280px;
  margin: 0 auto;
  width: 100%;
}

/* Main content sections */
.content-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
  box-shadow: var(--shadow-sm);
}

.content-card h2 {
  margin: 0 0 var(--space-md);
  font-size: 1.25rem;
  font-weight: 600;
}

.content-card p { margin: 0 0 var(--space-md); }
.content-card p:last-child { margin-bottom: 0; }

.content-card a {
  color: var(--color-accent);
  text-decoration: none;
}
.content-card a:hover { text-decoration: underline; }

/* Site footer – Emerald Tech dark bar (matches dark theme palette + accent) */
.site-footer {
  width: 100%;
  margin-top: var(--space-xl);
  padding: var(--space-xl) var(--space-md) var(--space-lg);
  background: #111827;
  color: #9CA3AF;
  font-size: 0.875rem;
  border-top: 1px solid #1F2937;
}

.site-footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.site-footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr 1.2fr;
  gap: var(--space-xl);
  margin-bottom: var(--space-lg);
}

.site-footer-col {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.site-footer-brand-col .site-footer-brand {
  margin: 0 0 var(--space-xs);
  font-weight: 600;
  font-size: 1rem;
  color: #F3F4F6;
}

.site-footer-brand img {
  display: block;
  height: 28px;
  width: auto;
  max-width: 140px;
  object-fit: contain;
}

.site-footer-brand-col .site-footer-tagline {
  margin: 0;
  font-size: 0.875rem;
  color: #9CA3AF;
}

.site-footer-heading {
  font-weight: 600;
  font-size: 0.8125rem;
  color: #F3F4F6;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.site-footer-col a {
  color: #D1D5DB;
  text-decoration: none;
}

.site-footer-col a:hover {
  color: #34D399;
}

.site-footer-copy {
  margin: 0;
  padding-top: var(--space-md);
  border-top: 1px solid #1F2937;
  font-size: 0.8125rem;
  color: #6B7280;
}

@media (max-width: 900px) {
  .site-footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 480px) {
  .site-footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
}

/* Breadcrumb */
.breadcrumb {
  margin-bottom: var(--space-lg);
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.breadcrumb a {
  color: var(--color-accent);
  text-decoration: none;
}

.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb span { color: var(--color-text-muted); }

/* Tool title */
.tool-title {
  margin: 0 0 var(--space-md);
  font-size: 1.75rem;
  font-weight: 600;
  line-height: 1.3;
}

/* Result display */
.result-display {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-md);
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  word-break: break-all;
  margin-top: var(--space-md);
  min-height: 48px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.result-display .copy-btn {
  margin-left: auto;
  flex-shrink: 0;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  font-size: 0.875rem;
  font-family: inherit;
  font-weight: 500;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.btn:hover {
  background: var(--color-bg);
  border-color: var(--color-text-muted);
}

.btn-primary {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  color: #fff;
}

/* Form elements */
input[type="text"],
input[type="number"],
input[type="email"],
input[type="url"],
textarea,
select {
  width: 100%;
  max-width: 100%;
  padding: var(--space-sm) var(--space-md);
  font-size: 1rem;
  font-family: inherit;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  color: var(--color-text);
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-accent);
}

label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: var(--space-xs);
}

.form-group { margin-bottom: var(--space-md); }

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: var(--space-md);
}

/* Related tools */
.related-tools {
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
}

.related-tools h3 {
  margin: 0 0 var(--space-md);
  font-size: 1.125rem;
  font-weight: 600;
}

.related-tools-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  list-style: none;
  margin: 0;
  padding: 0;
}

.related-tools-list a {
  display: inline-block;
  padding: var(--space-xs) var(--space-sm);
  font-size: 0.875rem;
  color: var(--color-accent);
  text-decoration: none;
  background: var(--color-accent-tint, rgba(16, 185, 129, 0.12));
  border-radius: var(--radius);
}

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

/* FAQ */
.faq-list { margin: 0; padding: 0; list-style: none; }
.faq-list li {
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-md) 0;
}
.faq-list li:last-child { border-bottom: none; }
.faq-list strong { display: block; margin-bottom: var(--space-xs); }

/* Popular tools section */
.popular-tools {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.popular-tools a {
  display: block;
  padding: var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--color-text);
  font-size: 0.9375rem;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.popular-tools a:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-sm);
}

/* Category tool lists on index */
.tool-list {
  list-style: none;
  margin: var(--space-md) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: var(--space-xs) var(--space-lg);
}

.tool-list li { margin: 0; }

.tool-list a {
  color: var(--color-accent);
  text-decoration: none;
  font-size: 0.9375rem;
}

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

/* Mobile: off-canvas sidebar */
@media (max-width: 1023px) {
  .sidebar {
    transform: translateX(-100%);
    visibility: hidden;
  }

  .sidebar.open {
    transform: translateX(0);
    visibility: visible;
  }

  .main-content { margin-left: 0; }

}

@media (max-width: 767px) {
  .main-inner { padding: var(--space-md); }
  .content-card { padding: var(--space-md); }
  .tool-title { font-size: 1.5rem; }
  .form-row { grid-template-columns: 1fr; }
}

/* Overlay for mobile drawer */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 99;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.sidebar-overlay.visible {
  display: block;
  opacity: 1;
}

@media (min-width: 1024px) {
  .sidebar-overlay { display: none !important; }
}

/* Hamburger - visible only on mobile */
.menu-toggle {
  display: none;
  position: fixed;
  top: var(--space-md);
  left: var(--space-md);
  z-index: 101;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
}

@media (max-width: 1023px) {
  .menu-toggle { display: flex; }
  .main-content { padding-top: var(--header-height); }
  .main-inner { padding-top: var(--space-md); }
}

/* Inline SVG icon sizes */
.icon-16 { width: 16px; height: 16px; flex-shrink: 0; }
.icon-20 { width: 20px; height: 20px; flex-shrink: 0; }

.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

/* Focus trap: visible focus for a11y */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Theme toggle – in header nav (main pages) or fixed fallback (tool pages) */
.theme-toggle {
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}
.theme-toggle:hover {
  background: var(--color-bg);
  border-color: var(--color-text-muted);
}
.theme-toggle svg {
  width: 20px;
  height: 20px;
}
.theme-toggle .icon-sun,
.theme-toggle .icon-moon { display: none; }
.theme-toggle[data-current="light"] .icon-sun,
.theme-toggle[data-current="dark"] .icon-moon { display: block; }
.theme-toggle[data-current="system"] .icon-sun { display: block; }
@media (prefers-color-scheme: dark) {
  .theme-toggle[data-current="system"] .icon-sun { display: none; }
  .theme-toggle[data-current="system"] .icon-moon { display: block; }
}

/* In header: inline with nav links */
.site-header .theme-toggle {
  width: 40px;
  height: 40px;
  margin-left: var(--space-sm);
}
.site-header .theme-toggle svg {
  width: 20px;
  height: 20px;
}

/* Fallback: fixed top-right on pages without header (tool pages) */