/* Quick Calculator UK — Main Stylesheet */
/* Mobile-first responsive design */

:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-primary-light: #3b82f6;
  --color-primary-50: #eff6ff;
  --color-primary-100: #dbeafe;
  --color-primary-200: #bfdbfe;
  --color-text: #1e293b;
  --color-text-light: #64748b;
  --color-text-muted: #94a3b8;
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-bg-section: #eff6ff;
  --color-border: #e2e8f0;
  --color-success: #16a34a;
  --color-warning: #f59e0b;
  --color-error: #dc2626;
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --shadow-sm: 0 1px 2px 0 rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
  --max-width: 1200px;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

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

body {
  font-family: var(--font-family);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

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

/* ========== SKIP LINK ========== */
.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  background: var(--color-primary);
  color: #fff;
  padding: 0.5rem 1rem;
  z-index: 9999;
  font-size: 0.875rem;
}
.skip-link:focus {
  top: 0;
}

/* ========== HEADER ========== */
.site-header {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  white-space: nowrap;
}

.site-logo:hover {
  text-decoration: none;
  color: var(--color-primary-dark);
}

.logo-icon {
  width: 32px;
  height: 32px;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1rem;
}

.nav-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.5rem;
  cursor: pointer;
  width: 44px;
  height: 44px;
}

.nav-toggle svg {
  width: 24px;
  height: 24px;
  stroke: var(--color-text);
}

.main-nav {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-lg);
  padding: 1rem;
}

.main-nav.open {
  display: block;
}

.main-nav ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.main-nav a {
  display: block;
  padding: 0.75rem 1rem;
  color: var(--color-text);
  font-weight: 500;
  font-size: 0.95rem;
  border-radius: var(--radius-md);
  transition: background 0.2s;
}

.main-nav a:hover,
.main-nav a.active {
  background: var(--color-primary-50);
  color: var(--color-primary);
  text-decoration: none;
}

@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }

  .main-nav {
    display: block;
    position: static;
    background: none;
    border: none;
    box-shadow: none;
    padding: 0;
  }

  .main-nav ul {
    flex-direction: row;
    gap: 0.25rem;
  }

  .main-nav a {
    padding: 0.5rem 0.75rem;
    font-size: 0.9rem;
  }
}

/* ========== BREADCRUMB ========== */
.breadcrumb {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.75rem 1rem;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.breadcrumb a {
  color: var(--color-text-light);
}

.breadcrumb a:hover {
  color: var(--color-primary);
}

.breadcrumb-sep {
  margin: 0 0.4rem;
  color: var(--color-text-muted);
}

/* ========== HERO ========== */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: #fff;
  padding: 3rem 1rem;
  text-align: center;
}

.hero-home {
  padding: 4rem 1rem;
}

.hero h1 {
  font-size: 1.75rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 0.75rem;
}

.hero p {
  font-size: 1.1rem;
  opacity: 0.9;
  max-width: 640px;
  margin: 0 auto;
}

.hero-search {
  margin-top: 1.75rem;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
  position: relative;
}

.hero-search input {
  width: 100%;
  padding: 1rem 1.25rem 1rem 3.25rem;
  border: none;
  border-radius: 100px;
  background: #ffffff;
  color: var(--color-text);
  font-size: 1rem;
  outline: none;
  box-shadow: 0 4px 20px rgba(0,0,0,0.15), 0 0 0 0 transparent;
  transition: box-shadow 0.25s ease;
}

.hero-search input::placeholder {
  color: #94a3b8;
}

.hero-search input:focus {
  box-shadow: 0 4px 20px rgba(0,0,0,0.15), 0 0 0 3px rgba(255,255,255,0.5);
}

.hero-search .search-icon {
  position: absolute;
  left: 1.15rem;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  stroke: #94a3b8;
  pointer-events: none;
}

.search-results-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: #fff;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  margin-top: 0.5rem;
  max-height: 300px;
  overflow-y: auto;
  display: none;
  z-index: 50;
}

.search-results-dropdown.active {
  display: block;
}

.search-results-dropdown a {
  display: block;
  padding: 0.75rem 1rem;
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border);
  font-size: 0.9rem;
}

.search-results-dropdown a:hover {
  background: var(--color-primary-50);
  text-decoration: none;
}

.search-results-dropdown a:last-child {
  border-bottom: none;
}

.search-results-dropdown .search-category {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

@media (min-width: 768px) {
  .hero h1 {
    font-size: 2.5rem;
  }
  .hero-home {
    padding: 5rem 1rem;
  }
}

/* ========== CONTAINER ========== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1rem;
}

/* ========== ADSENSE SLOTS ========== */
/* Hide unfilled AdSense slots */
.ad-slot { display: none !important; }
.ad-slot:has(ins[data-ad-status="filled"]) { display: block !important; }
ins.adsbygoogle[data-ad-status="unfilled"] { display: none !important; }
ins.adsbygoogle:not([data-ad-status]) { display: none !important; }
.ad-slot-top, .ad-slot-mid, .ad-slot-bottom { margin: 0; }

/* ========== CALCULATOR CARD ========== */
.calc-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  padding: 2rem 0;
}

@media (min-width: 640px) {
  .calc-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .calc-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.calc-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: box-shadow 0.2s, transform 0.2s;
  display: flex;
  flex-direction: column;
}

.calc-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.calc-card-icon {
  width: 48px;
  height: 48px;
  background: var(--color-primary-50);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--color-primary);
}

.calc-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.calc-card h3 a {
  color: var(--color-text);
}

.calc-card h3 a:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.calc-card p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  flex-grow: 1;
  margin-bottom: 1rem;
}

.calc-card .card-link {
  font-size: 0.9rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.calc-card .card-link::after {
  content: "\2192";
}

/* Category cards on home page */
.category-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  padding: 2rem 0;
}

@media (min-width: 640px) {
  .category-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .category-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
  }
}

.category-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 2rem;
  text-align: center;
  transition: box-shadow 0.2s, transform 0.2s;
}

.category-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
}

.category-card-icon {
  width: 64px;
  height: 64px;
  background: var(--color-primary-50);
  border-radius: 50%;
  margin: 0 auto 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
}

.category-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.category-card p {
  color: var(--color-text-light);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.category-card .cat-count {
  font-size: 0.8rem;
  color: var(--color-primary);
  font-weight: 600;
  background: var(--color-primary-50);
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-sm);
}

/* ========== PAGE LAYOUT ========== */
.page-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1rem;
}

.content-wrapper {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 1024px) {
  .content-wrapper {
    grid-template-columns: 1fr 320px;
  }
}

.main-content {
  min-width: 0;
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.sidebar-widget {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
}

.sidebar-widget h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-primary-50);
}

.sidebar-widget ul {
  list-style: none;
}

.sidebar-widget li {
  margin-bottom: 0.4rem;
}

.sidebar-widget li a {
  display: block;
  padding: 0.35rem 0;
  font-size: 0.9rem;
  color: var(--color-text);
}

.sidebar-widget li a:hover {
  color: var(--color-primary);
  text-decoration: none;
}

/* ========== CALCULATOR BOX ========== */
.calculator-box {
  background: var(--color-bg);
  border: 2px solid var(--color-primary-200);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  margin: 2rem 0;
}

.calculator-box h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
  color: var(--color-text);
}

.form-group .hint {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: 0.2rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 640px) {
  .form-row {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 768px) {
  .form-row-3 {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

input[type="number"],
input[type="text"],
input[type="email"],
input[type="date"],
select,
textarea {
  width: 100%;
  padding: 0.625rem 0.875rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-family: var(--font-family);
  color: var(--color-text);
  background: var(--color-bg);
  transition: border-color 0.2s, box-shadow 0.2s;
  min-height: 44px;
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.input-group {
  display: flex;
  align-items: stretch;
}

.input-group input {
  border-top-right-radius: 0;
  border-bottom-right-radius: 0;
}

.input-group .input-suffix {
  display: flex;
  align-items: center;
  padding: 0 0.75rem;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-left: none;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-size: 0.9rem;
  color: var(--color-text-light);
  white-space: nowrap;
}

.toggle-group {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.toggle-btn {
  padding: 0.5rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  cursor: pointer;
  font-size: 0.9rem;
  font-family: var(--font-family);
  color: var(--color-text-light);
  transition: all 0.2s;
  min-height: 44px;
}

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

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

/* ========== RESULTS BOX ========== */
.results-box {
  background: linear-gradient(135deg, var(--color-primary-50) 0%, #fff 100%);
  border: 2px solid var(--color-primary-200);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-top: 1.5rem;
}

.results-box h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.result-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.95rem;
}

.result-row:last-child {
  border-bottom: none;
}

.result-label {
  color: var(--color-text-light);
}

.result-value {
  font-weight: 700;
  color: var(--color-text);
  text-align: right;
}

.result-highlight {
  background: var(--color-primary);
  color: #fff;
  padding: 1rem;
  border-radius: var(--radius-md);
  text-align: center;
  margin-top: 1rem;
}

.result-highlight .big-number {
  font-size: 2rem;
  font-weight: 800;
  display: block;
}

.result-highlight .label {
  font-size: 0.85rem;
  opacity: 0.9;
}

.result-breakdown {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin-top: 1rem;
}

@media (min-width: 640px) {
  .result-breakdown {
    grid-template-columns: repeat(3, 1fr);
  }
}

.result-breakdown-item {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.75rem;
  text-align: center;
}

.result-breakdown-item .val {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-primary);
  display: block;
}

.result-breakdown-item .lbl {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* ========== ARTICLE CONTENT ========== */
.article-content {
  font-size: 1rem;
  line-height: 1.8;
}

.article-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
  color: var(--color-text);
}

.article-content h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-top: 2rem;
  margin-bottom: 0.5rem;
  color: var(--color-text);
}

.article-content p {
  margin-bottom: 1rem;
}

.article-content ul, .article-content ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}

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

.article-content strong {
  font-weight: 700;
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.9rem;
}

.article-content table th,
.article-content table td {
  padding: 0.625rem 0.75rem;
  border: 1px solid var(--color-border);
  text-align: left;
}

.article-content table th {
  background: var(--color-primary-50);
  font-weight: 700;
  color: var(--color-text);
}

.article-content table tr:nth-child(even) {
  background: var(--color-bg-alt);
}

.info-box {
  background: var(--color-primary-50);
  border-left: 4px solid var(--color-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  font-size: 0.95rem;
}

.info-box strong {
  display: block;
  margin-bottom: 0.25rem;
}

.warning-box {
  background: #fffbeb;
  border-left: 4px solid var(--color-warning);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  font-size: 0.95rem;
}

/* ========== FAQ SECTION ========== */
.faq-section {
  margin: 2.5rem 0;
}

.faq-section h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 0.5rem;
  overflow: hidden;
}

.faq-question {
  width: 100%;
  text-align: left;
  background: var(--color-bg);
  border: none;
  padding: 1rem 1.25rem;
  font-size: 1rem;
  font-weight: 600;
  font-family: var(--font-family);
  color: var(--color-text);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 44px;
  transition: background 0.2s;
}

.faq-question:hover {
  background: var(--color-bg-alt);
}

.faq-question::after {
  content: "+";
  font-size: 1.25rem;
  color: var(--color-primary);
  flex-shrink: 0;
  margin-left: 1rem;
  transition: transform 0.2s;
}

.faq-item.open .faq-question::after {
  content: "\2212";
}

.faq-answer {
  display: none;
  padding: 0 1.25rem 1rem;
  font-size: 0.95rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

.faq-item.open .faq-answer {
  display: block;
}

/* ========== SECTION PAGE (landing for /diy/, /tax/ etc.) ========== */
.section-intro {
  background: var(--color-bg-section);
  padding: 2rem 1rem;
  margin-bottom: 2rem;
  border-radius: var(--radius-lg);
}

.section-intro p {
  max-width: 720px;
  color: var(--color-text-light);
  font-size: 1rem;
}

/* ========== RELATED CALCULATORS ========== */
.related-calcs {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin: 2rem 0;
}

.related-calcs h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.related-calcs-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}

@media (min-width: 640px) {
  .related-calcs-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.related-calc-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 0.9rem;
  transition: border-color 0.2s;
}

.related-calc-link:hover {
  border-color: var(--color-primary);
  text-decoration: none;
  color: var(--color-primary);
}

.related-calc-link .icon {
  font-size: 1.1rem;
}

/* ========== FOOTER ========== */
.site-footer {
  background: var(--color-text);
  color: #fff;
  padding: 3rem 1rem 1.5rem;
  margin-top: 3rem;
}

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

@media (min-width: 640px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: #fff;
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 0.35rem;
}

.footer-col a {
  color: rgba(255,255,255,0.7);
  font-size: 0.85rem;
}

.footer-col a:hover {
  color: #fff;
  text-decoration: none;
}

.footer-bottom {
  max-width: var(--max-width);
  margin: 0 auto;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255,255,255,0.15);
  text-align: center;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.5);
}

/* ========== UPDATED BADGE ========== */
.updated-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.8rem;
  color: var(--color-success);
  font-weight: 600;
  background: #f0fdf4;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
}

/* ========== PRINT STYLES ========== */
@media print {
  .site-header, .site-footer, .ad-slot, .nav-toggle, .main-nav, .sidebar {
    display: none !important;
  }

  body {
    font-size: 11pt;
    color: #000;
  }

  .calculator-box, .results-box {
    border: 1px solid #ccc;
    break-inside: avoid;
  }
}