/* ==========================================================================
   sunglass.sg — Main Stylesheet
   Mobile-first, no build step required, Core Web Vitals friendly
   ========================================================================== */

/* --------------------------------------------------------------------------
   0. CSS Custom Properties
   -------------------------------------------------------------------------- */
:root {
  /* Colours */
  --color-bg:          #ffffff;
  --color-bg-subtle:   #f8f7f5;
  --color-bg-muted:    #f1f0ed;
  --color-text:        #1a1a2e;
  --color-text-muted:  #5a5a72;
  --color-text-light:  #8888a0;
  --color-accent:      #2563eb;
  --color-accent-dark: #1d4ed8;
  --color-accent-warm: #f59e0b;
  --color-accent-warm-dark: #d97706;
  --color-border:      #e2e1de;
  --color-border-strong: #c5c4bf;
  --color-success:     #16a34a;
  --color-warning:     #ca8a04;
  --color-danger:      #dc2626;

  /* Typography */
  --font-sans:  system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
                Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji";
  --font-serif: Georgia, "Times New Roman", Times, serif;
  --font-mono:  "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  --text-xs:   0.75rem;   /* 12px */
  --text-sm:   0.875rem;  /* 14px */
  --text-base: 1rem;      /* 16px */
  --text-lg:   1.125rem;  /* 18px */
  --text-xl:   1.25rem;   /* 20px */
  --text-2xl:  1.5rem;    /* 24px */
  --text-3xl:  1.875rem;  /* 30px */
  --text-4xl:  2.25rem;   /* 36px */
  --text-5xl:  3rem;      /* 48px */

  --leading-tight:  1.25;
  --leading-snug:   1.375;
  --leading-normal: 1.5;
  --leading-relaxed:1.65;
  --leading-loose:  1.8;

  --fw-normal:    400;
  --fw-medium:    500;
  --fw-semibold:  600;
  --fw-bold:      700;
  --fw-extrabold: 800;

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Layout */
  --container-sm:  640px;
  --container-md:  768px;
  --container-lg:  1024px;
  --container-xl:  1280px;
  --container-2xl: 1440px;

  /* Borders */
  --radius-sm:  0.25rem;
  --radius-md:  0.5rem;
  --radius-lg:  0.75rem;
  --radius-xl:  1rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-xs:  0 1px 2px rgba(26,26,46,0.06);
  --shadow-sm:  0 1px 3px rgba(26,26,46,0.08), 0 1px 2px rgba(26,26,46,0.05);
  --shadow-md:  0 4px 6px rgba(26,26,46,0.07), 0 2px 4px rgba(26,26,46,0.05);
  --shadow-lg:  0 10px 15px rgba(26,26,46,0.08), 0 4px 6px rgba(26,26,46,0.05);
  --shadow-xl:  0 20px 25px rgba(26,26,46,0.09), 0 10px 10px rgba(26,26,46,0.04);

  /* Transitions */
  --transition-fast:   150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow:   350ms ease;

  /* Header height (used for sticky offset) */
  --header-height: 60px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: calc(var(--header-height) + var(--space-4));
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main { flex: 1; }

/* Prevent layout shift from scrollbar */
html { overflow-y: scroll; }

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

/* Explicit dimensions prevent layout shift */
img { aspect-ratio: attr(width) / attr(height); }

a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--transition-fast);
}
a:hover { color: var(--color-accent-dark); }
a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

ul, ol { list-style: none; }

button {
  cursor: pointer;
  font-family: inherit;
  border: none;
  background: none;
}

/* --------------------------------------------------------------------------
   2. Accessibility
   -------------------------------------------------------------------------- */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  background: var(--color-accent);
  color: #fff;
  padding: var(--space-2) var(--space-4);
  font-weight: var(--fw-semibold);
  text-decoration: none;
  border-radius: var(--radius-md);
  z-index: 9999;
  transition: top var(--transition-fast);
}
.skip-link:focus { top: var(--space-2); }

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* --------------------------------------------------------------------------
   3. Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: var(--fw-bold);
  line-height: var(--leading-tight);
  color: var(--color-text);
  letter-spacing: -0.01em;
}

h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }
h5 { font-size: var(--text-base); }
h6 { font-size: var(--text-sm); }

@media (min-width: 768px) {
  h1 { font-size: var(--text-4xl); }
  h2 { font-size: var(--text-3xl); }
  h3 { font-size: var(--text-2xl); }
}

p { margin-bottom: var(--space-4); }
p:last-child { margin-bottom: 0; }

strong { font-weight: var(--fw-semibold); }
em { font-style: italic; }

small { font-size: var(--text-sm); }

/* --------------------------------------------------------------------------
   4. Layout & Container
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-xl);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

@media (min-width: 640px)  { .container { padding-inline: var(--space-6); } }
@media (min-width: 1024px) { .container { padding-inline: var(--space-8); } }

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

/* --------------------------------------------------------------------------
   5. Header & Navigation
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-xs);
}

.site-header__inner,
.header-inner {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  height: 100%;
  max-width: var(--container-xl);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

@media (min-width: 640px)  { .site-header__inner, .header-inner { padding-inline: var(--space-6); } }
@media (min-width: 1024px) { .site-header__inner, .header-inner { padding-inline: var(--space-8); } }

/* Logo */
.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  flex-shrink: 0;
}
.site-logo__text {
  font-size: var(--text-lg);
  font-weight: var(--fw-bold);
  color: var(--color-text);
  letter-spacing: -0.02em;
}
.site-logo__text span { color: var(--color-accent); }
.site-logo:hover .site-logo__text { color: var(--color-accent); }
.site-logo:focus-visible { outline-offset: 4px; }

/* Nav */
.site-nav {
  display: none;
  position: fixed;
  inset: var(--header-height) 0 0 0;
  background: var(--color-bg);
  overflow-y: auto;
  padding: var(--space-6) var(--space-4);
  z-index: 99;
  border-top: 1px solid var(--color-border);
}
.site-nav.is-open { display: block; }
@media (min-width: 768px) {
  .site-nav {
    display: flex !important;
    position: static;
    inset: auto;
    background: none;
    overflow: visible;
    padding: 0;
    z-index: auto;
    border-top: none;
    align-items: center;
    gap: var(--space-1);
    margin-left: auto;
  }
}

/* Plain ul/li/a inside .site-nav (sub-pages) */
.site-nav ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
@media (min-width: 768px) {
  .site-nav ul { flex-direction: row; align-items: center; }
}
.site-nav li a {
  display: block;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text-muted);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background var(--transition-fast);
}
.site-nav li a:hover,
.site-nav li a[aria-current="page"] {
  color: var(--color-text);
  background: var(--color-bg-muted);
}

.site-nav__list {
  display: none;
  align-items: center;
  gap: var(--space-1);
}

@media (min-width: 768px) {
  .site-nav__list { display: flex; }
}

.site-nav__item { position: relative; }

.site-nav__link {
  display: block;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text-muted);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background var(--transition-fast);
  white-space: nowrap;
}
.site-nav__link:hover,
.site-nav__link[aria-current="page"] {
  color: var(--color-text);
  background: var(--color-bg-muted);
}

/* Dropdown */
.site-nav__dropdown {
  position: absolute;
  top: calc(100% + var(--space-2));
  left: 0;
  min-width: 200px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-2);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity var(--transition-fast), transform var(--transition-fast),
              visibility var(--transition-fast);
  z-index: 10;
}
.site-nav__item:hover .site-nav__dropdown,
.site-nav__item:focus-within .site-nav__dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.site-nav__dropdown a {
  display: block;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background var(--transition-fast);
}
.site-nav__dropdown a:hover {
  color: var(--color-text);
  background: var(--color-bg-subtle);
}

/* Mobile nav toggle */
.nav-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  color: var(--color-text);
  transition: background var(--transition-fast);
  margin-left: auto;
}
.nav-toggle:hover { background: var(--color-bg-muted); }
@media (min-width: 768px) { .nav-toggle { display: none; } }

.nav-toggle__icon {
  display: flex;
  flex-direction: column;
  gap: 5px;
  width: 22px;
}
.nav-toggle__icon span {
  display: block;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__icon span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__icon span:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__icon span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile nav drawer */
.mobile-nav {
  display: none;
  position: fixed;
  inset: var(--header-height) 0 0 0;
  background: var(--color-bg);
  overflow-y: auto;
  padding: var(--space-4);
  z-index: 99;
  border-top: 1px solid var(--color-border);
}
.mobile-nav.is-open { display: block; }

/* Primary nav (HTML uses .primary-nav / .nav-list / .nav-link) */
.primary-nav {
  display: none;
  position: fixed;
  inset: var(--header-height) 0 0 0;
  background: var(--color-bg);
  overflow-y: auto;
  padding: var(--space-6) var(--space-4);
  z-index: 99;
  border-top: 1px solid var(--color-border);
}
.primary-nav.is-open { display: block; }
@media (min-width: 768px) {
  .primary-nav {
    display: flex !important;
    position: static;
    inset: auto;
    background: none;
    overflow: visible;
    padding: 0;
    z-index: auto;
    border-top: none;
    margin-left: auto;
    align-items: center;
  }
}

.nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
@media (min-width: 768px) {
  .nav-list { flex-direction: row; align-items: center; }
}

.nav-link {
  display: block;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text-muted);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background var(--transition-fast);
}
.nav-link:hover,
.nav-link[aria-current="page"] {
  color: var(--color-text);
  background: var(--color-bg-muted);
}

/* Hamburger spans — direct children of .nav-toggle */
.nav-toggle > span {
  display: block;
  height: 2px;
  width: 22px;
  background: currentColor;
  border-radius: 1px;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
  margin: 5px 0;
}
.nav-toggle[aria-expanded="true"] > span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] > span:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] > span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.mobile-nav__section { margin-bottom: var(--space-6); }
.mobile-nav__heading {
  font-size: var(--text-xs);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-light);
  margin-bottom: var(--space-2);
  padding: 0 var(--space-3);
}
.mobile-nav__link {
  display: block;
  padding: var(--space-2) var(--space-3);
  color: var(--color-text);
  text-decoration: none;
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  transition: background var(--transition-fast);
}
.mobile-nav__link:hover { background: var(--color-bg-subtle); }

/* --------------------------------------------------------------------------
   6. Breadcrumbs
   -------------------------------------------------------------------------- */
.breadcrumb {
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg-subtle);
}
.breadcrumb__list,
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  list-style: none;
  padding: 0;
  margin: 0;
}
.breadcrumb__item,
.breadcrumb li {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}
.breadcrumb__item::before,
.breadcrumb li::before {
  content: "/";
  color: var(--color-border-strong);
}
.breadcrumb__item:first-child::before,
.breadcrumb li:first-child::before { display: none; }
.breadcrumb__link,
.breadcrumb li a {
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}
.breadcrumb__link:hover,
.breadcrumb li a:hover { color: var(--color-accent); }
.breadcrumb__current,
.breadcrumb li[aria-current="page"] {
  color: var(--color-text);
  font-weight: var(--fw-medium);
}

/* --------------------------------------------------------------------------
   7. Article Card Grid
   -------------------------------------------------------------------------- */
.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

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

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

/* Card */
.card {
  display: flex;
  flex-direction: column;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: box-shadow var(--transition-normal), transform var(--transition-normal);
  text-decoration: none;
  color: inherit;
}
.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.card__image {
  aspect-ratio: 16 / 9;
  background: var(--color-bg-muted);
  overflow: hidden;
}
.card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}
.card:hover .card__image img { transform: scale(1.04); }

.card__body {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-5);
  flex: 1;
}

.card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-xs);
  color: var(--color-text-light);
}

.card__category {
  font-size: var(--text-xs);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-accent);
  text-decoration: none;
}

.card__title {
  font-size: var(--text-lg);
  font-weight: var(--fw-bold);
  line-height: var(--leading-snug);
  color: var(--color-text);
}
.card:hover .card__title { color: var(--color-accent); }

.card__excerpt {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: var(--leading-normal);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card__footer {
  margin-top: auto;
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card__read-time {
  font-size: var(--text-xs);
  color: var(--color-text-light);
}

/* Featured / large card */
.card--featured {
  flex-direction: row;
  grid-column: 1 / -1;
}
.card--featured .card__image {
  width: 40%;
  flex-shrink: 0;
  aspect-ratio: unset;
}
.card--featured .card__title { font-size: var(--text-2xl); }

@media (max-width: 639px) {
  .card--featured { flex-direction: column; }
  .card--featured .card__image { width: 100%; aspect-ratio: 16 / 9; }
}

/* --------------------------------------------------------------------------
   8. Article Body (Prose)
   -------------------------------------------------------------------------- */
.prose {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  line-height: var(--leading-loose);
  color: var(--color-text);
  max-width: 70ch;
}

.prose h2,
.prose h3,
.prose h4 {
  font-family: var(--font-sans);
  margin-top: var(--space-10);
  margin-bottom: var(--space-4);
  scroll-margin-top: calc(var(--header-height) + var(--space-6));
}

.prose h2 {
  font-size: var(--text-2xl);
  font-weight: var(--fw-bold);
  padding-bottom: var(--space-3);
  border-bottom: 2px solid var(--color-border);
}

.prose h3 {
  font-size: var(--text-xl);
  font-weight: var(--fw-semibold);
}

.prose h4 {
  font-size: var(--text-lg);
  font-weight: var(--fw-semibold);
  color: var(--color-text-muted);
}

.prose p {
  margin-bottom: var(--space-5);
}

.prose ul,
.prose ol {
  margin-bottom: var(--space-5);
  padding-left: var(--space-6);
}
.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }
.prose li { margin-bottom: var(--space-2); }
.prose li::marker { color: var(--color-accent); }

.prose a {
  color: var(--color-accent);
  font-weight: var(--fw-medium);
}

.prose strong { font-weight: var(--fw-semibold); }

.prose blockquote {
  border-left: 4px solid var(--color-accent);
  margin: var(--space-8) 0;
  padding: var(--space-4) var(--space-6);
  background: var(--color-bg-subtle);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-style: italic;
  color: var(--color-text-muted);
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--color-bg-muted);
  padding: 0.1em 0.35em;
  border-radius: var(--radius-sm);
  color: var(--color-text);
}

.prose pre {
  background: var(--color-text);
  color: var(--color-bg-subtle);
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  margin-bottom: var(--space-6);
}
.prose pre code { background: none; padding: 0; color: inherit; }

.prose hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-10) 0;
}

.prose img {
  border-radius: var(--radius-lg);
  margin: var(--space-8) 0;
  box-shadow: var(--shadow-md);
}

.prose figcaption {
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  color: var(--color-text-light);
  text-align: center;
  margin-top: var(--space-2);
  font-style: italic;
}

/* --------------------------------------------------------------------------
   9. Comparison Table
   -------------------------------------------------------------------------- */
.comparison-table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: var(--space-8) 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
  white-space: nowrap;
}

.comparison-table thead {
  background: var(--color-bg-subtle);
  border-bottom: 2px solid var(--color-border);
}

.comparison-table th {
  padding: var(--space-3) var(--space-5);
  font-weight: var(--fw-semibold);
  text-align: left;
  color: var(--color-text);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.comparison-table th:first-child { min-width: 160px; }

.comparison-table td {
  padding: var(--space-3) var(--space-5);
  border-bottom: 1px solid var(--color-border);
  vertical-align: middle;
}

.comparison-table tbody tr:last-child td { border-bottom: none; }

.comparison-table tbody tr:hover { background: var(--color-bg-subtle); }

.comparison-table .best-pick {
  background: #eff6ff;
  font-weight: var(--fw-semibold);
}
.comparison-table .best-pick td:first-child {
  border-left: 3px solid var(--color-accent);
}

/* Check / X icons via CSS */
.check::before { content: "✓"; color: var(--color-success); font-weight: bold; }
.cross::before { content: "✗"; color: var(--color-danger); }
.partial::before { content: "~"; color: var(--color-warning); }

/* --------------------------------------------------------------------------
   10. Brand Profile Card
   -------------------------------------------------------------------------- */
.brand-card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-6);
  padding: var(--space-6);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
}

.brand-card__logo {
  width: 80px;
  height: 80px;
  flex-shrink: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-bg-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
}
.brand-card__logo img { width: 100%; height: 100%; object-fit: contain; padding: var(--space-2); }

.brand-card__content { flex: 1; }
.brand-card__name {
  font-size: var(--text-xl);
  font-weight: var(--fw-bold);
  margin-bottom: var(--space-1);
}
.brand-card__tagline {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}
.brand-card__stats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}
.brand-card__stat { font-size: var(--text-sm); }
.brand-card__stat strong { display: block; font-size: var(--text-base); font-weight: var(--fw-semibold); }
.brand-card__stat span { color: var(--color-text-muted); }
.brand-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

@media (max-width: 639px) {
  .brand-card { flex-direction: column; }
}

/* --------------------------------------------------------------------------
   11. Glossary Term Card
   -------------------------------------------------------------------------- */
.glossary-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}
@media (min-width: 768px) {
  .glossary-grid { grid-template-columns: repeat(2, 1fr); }
}

.glossary-card {
  padding: var(--space-5);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: box-shadow var(--transition-fast);
}
.glossary-card:hover { box-shadow: var(--shadow-md); }

.glossary-card__term {
  font-size: var(--text-lg);
  font-weight: var(--fw-bold);
  margin-bottom: var(--space-1);
  color: var(--color-accent);
}
.glossary-card__definition {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: var(--leading-relaxed);
}

/* Alphabetical index */
.glossary-alpha-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-6);
}
.glossary-alpha-nav a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  font-size: var(--text-sm);
  font-weight: var(--fw-semibold);
  color: var(--color-text-muted);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: background var(--transition-fast), color var(--transition-fast);
}
.glossary-alpha-nav a:hover,
.glossary-alpha-nav a.active {
  background: var(--color-accent);
  color: #fff;
}
.glossary-alpha-nav a.empty { color: var(--color-border-strong); pointer-events: none; }

/* --------------------------------------------------------------------------
   12. FAQ Accordion (CSS-only via details/summary)
   -------------------------------------------------------------------------- */
.faq-list { display: flex; flex-direction: column; gap: var(--space-3); }

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: box-shadow var(--transition-fast);
}
.faq-item:hover { box-shadow: var(--shadow-sm); }
.faq-item[open] { box-shadow: var(--shadow-md); }

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-5);
  font-weight: var(--fw-semibold);
  font-size: var(--text-base);
  cursor: pointer;
  list-style: none;
  user-select: none;
  color: var(--color-text);
  transition: background var(--transition-fast);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary:hover { background: var(--color-bg-subtle); }

.faq-item summary::after {
  content: "+";
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  font-size: var(--text-xl);
  font-weight: var(--fw-normal);
  color: var(--color-accent);
  transition: transform var(--transition-normal);
}
.faq-item[open] summary::after {
  content: "−";
}

.faq-answer {
  padding: 0 var(--space-5) var(--space-5);
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: var(--leading-relaxed);
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-4);
}
.faq-answer p:last-child { margin-bottom: 0; }

/* --------------------------------------------------------------------------
   13. Search Bar
   -------------------------------------------------------------------------- */
.search-form {
  display: flex;
  gap: var(--space-2);
  width: 100%;
  max-width: 600px;
}

.search-form__input {
  flex: 1;
  height: 44px;
  padding: 0 var(--space-4);
  font-size: var(--text-base);
  font-family: inherit;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  appearance: none;
  -webkit-appearance: none;
}
.search-form__input::placeholder { color: var(--color-text-light); }
.search-form__input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.12);
}

.search-form__btn {
  height: 44px;
  padding: 0 var(--space-5);
  background: var(--color-accent);
  color: #fff;
  font-weight: var(--fw-semibold);
  font-size: var(--text-sm);
  border-radius: var(--radius-lg);
  white-space: nowrap;
  transition: background var(--transition-fast);
}
.search-form__btn:hover { background: var(--color-accent-dark); }

/* Hero search variant */
.search-hero {
  padding: var(--space-16) 0;
  background: linear-gradient(135deg, #eff6ff 0%, #f8f7f5 100%);
  text-align: center;
}
.search-hero .search-form { margin-inline: auto; }

/* --------------------------------------------------------------------------
   14. Tags & Badges
   -------------------------------------------------------------------------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--fw-semibold);
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.tag--default  { background: var(--color-bg-muted); color: var(--color-text-muted); }
.tag--default:hover { background: var(--color-border); color: var(--color-text); }
.tag--accent   { background: #eff6ff; color: var(--color-accent); }
.tag--accent:hover { background: var(--color-accent); color: #fff; }
.tag--warm     { background: #fffbeb; color: var(--color-accent-warm-dark); }
.tag--success  { background: #f0fdf4; color: var(--color-success); }
.tag--danger   { background: #fef2f2; color: var(--color-danger); }

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.15em 0.5em;
  font-size: var(--text-xs);
  font-weight: var(--fw-semibold);
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.badge--new    { background: #eff6ff; color: var(--color-accent); }
.badge--hot    { background: #fff7ed; color: #ea580c; }
.badge--best   { background: #fefce8; color: #854d0e; }

/* --------------------------------------------------------------------------
   15. Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-size: var(--text-sm);
  font-weight: var(--fw-semibold);
  font-family: inherit;
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: background var(--transition-fast), color var(--transition-fast),
              box-shadow var(--transition-fast), transform var(--transition-fast);
  cursor: pointer;
  white-space: nowrap;
  border: 1.5px solid transparent;
}
.btn:active { transform: translateY(1px); }

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

.btn--secondary {
  background: var(--color-bg);
  color: var(--color-accent);
  border-color: var(--color-accent);
}
.btn--secondary:hover {
  background: #eff6ff;
}

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

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

.btn--sm { padding: var(--space-2) var(--space-4); font-size: var(--text-xs); }
.btn--lg { padding: var(--space-4) var(--space-8); font-size: var(--text-base); }

/* --------------------------------------------------------------------------
   16. Page Hero
   -------------------------------------------------------------------------- */
.page-hero {
  padding: var(--space-12) 0 var(--space-10);
  background: var(--color-bg-subtle);
  border-bottom: 1px solid var(--color-border);
}
.page-hero--dark {
  background: var(--color-text);
  color: #fff;
}
.page-hero--dark h1 { color: #fff; }

.page-hero__eyebrow {
  font-size: var(--text-sm);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
  display: block;
}
.page-hero--dark .page-hero__eyebrow { color: var(--color-accent-warm); }

.page-hero__title {
  font-size: var(--text-4xl);
  font-weight: var(--fw-extrabold);
  line-height: var(--leading-tight);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-4);
  max-width: 22ch;
}

@media (min-width: 768px) {
  .page-hero__title { font-size: var(--text-5xl); }
}

.page-hero__lead {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 60ch;
  line-height: var(--leading-relaxed);
}
.page-hero--dark .page-hero__lead { color: rgba(255,255,255,0.75); }

.page-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

/* --------------------------------------------------------------------------
   17. Section layouts
   -------------------------------------------------------------------------- */
.section {
  padding: var(--space-16) 0;
}
.section--sm { padding: var(--space-10) 0; }
.section--lg { padding: var(--space-24) 0; }
.section--bg { background: var(--color-bg-subtle); }

.section__header {
  margin-bottom: var(--space-10);
}
.section__header--center { text-align: center; }

.section__eyebrow {
  display: block;
  font-size: var(--text-sm);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: var(--space-2);
}

.section__title {
  font-size: var(--text-3xl);
  font-weight: var(--fw-extrabold);
  letter-spacing: -0.01em;
}

@media (min-width: 768px) {
  .section__title { font-size: var(--text-4xl); }
}

.section__subtitle {
  margin-top: var(--space-3);
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 60ch;
}
.section__header--center .section__subtitle { margin-inline: auto; }

/* Two-column with sidebar */
.layout-sidebar {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  align-items: start;
}

@media (min-width: 1024px) {
  .layout-sidebar {
    grid-template-columns: 1fr 300px;
  }
  .layout-sidebar--left {
    grid-template-columns: 280px 1fr;
  }
}

/* --------------------------------------------------------------------------
   18. Sidebar Widgets
   -------------------------------------------------------------------------- */
.widget {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.widget__header {
  padding: var(--space-4) var(--space-5);
  background: var(--color-bg-subtle);
  border-bottom: 1px solid var(--color-border);
  font-size: var(--text-sm);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
}

.widget__body { padding: var(--space-4) var(--space-5); }

.widget__list { display: flex; flex-direction: column; gap: var(--space-1); }
.widget__list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: background var(--transition-fast), color var(--transition-fast);
}
.widget__list a:hover {
  background: var(--color-bg-subtle);
  color: var(--color-accent);
}
.widget__list a span { font-size: var(--text-xs); color: var(--color-text-light); }

/* --------------------------------------------------------------------------
   19. Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background: var(--color-text);
  color: rgba(255,255,255,0.75);
  padding: var(--space-16) 0 var(--space-8);
  margin-top: auto;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-12);
}

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

@media (min-width: 1024px) {
  .site-footer__grid { grid-template-columns: 2fr 1fr 1fr 1fr 1fr; }
}

.site-footer__brand .site-logo__text { color: #fff; }
.site-footer__tagline {
  margin-top: var(--space-3);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  max-width: 36ch;
}

.site-footer__col-title {
  font-size: var(--text-xs);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: rgba(255,255,255,0.5);
  margin-bottom: var(--space-4);
}

.site-footer__links { display: flex; flex-direction: column; gap: var(--space-2); }
.site-footer__links a {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.65);
  text-decoration: none;
  transition: color var(--transition-fast);
}
.site-footer__links a:hover { color: #fff; }

.site-footer__bottom {
  padding-top: var(--space-8);
  border-top: 1px solid rgba(255,255,255,0.1);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.site-footer__copy {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.4);
}

.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}
.site-footer__legal a {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.4);
  text-decoration: none;
  transition: color var(--transition-fast);
}
.site-footer__legal a:hover { color: rgba(255,255,255,0.75); }

/* --------------------------------------------------------------------------
   20. Category / Topic Pages
   -------------------------------------------------------------------------- */
.topic-header {
  padding: var(--space-12) 0 var(--space-8);
  background: linear-gradient(135deg, var(--color-bg-subtle) 0%, var(--color-bg) 100%);
  border-bottom: 1px solid var(--color-border);
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

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

@media (min-width: 1024px) {
  .topic-grid { grid-template-columns: repeat(4, 1fr); }
}

.topic-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-2);
  padding: var(--space-5);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: var(--color-text);
  transition: box-shadow var(--transition-fast), transform var(--transition-fast),
              border-color var(--transition-fast);
}
.topic-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.topic-card__icon {
  font-size: 2rem;
  line-height: 1;
  margin-bottom: var(--space-1);
}

.topic-card__label {
  font-size: var(--text-sm);
  font-weight: var(--fw-semibold);
}

.topic-card__count {
  font-size: var(--text-xs);
  color: var(--color-text-light);
}

/* --------------------------------------------------------------------------
   21. Rating Stars
   -------------------------------------------------------------------------- */
.rating {
  display: inline-flex;
  gap: 1px;
  font-size: var(--text-sm);
  color: var(--color-accent-warm);
}
.rating__count {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-left: var(--space-1);
}

/* --------------------------------------------------------------------------
   22. Callout boxes (used in articles and guides)
   -------------------------------------------------------------------------- */
.callout {
  display: flex;
  gap: var(--space-4);
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  margin: var(--space-6) 0;
  border-left: 4px solid;
}
.callout__icon { font-size: 1.25rem; flex-shrink: 0; line-height: 1.4; }
.callout__body { flex: 1; }
.callout__title {
  font-size: var(--text-sm);
  font-weight: var(--fw-bold);
  margin-bottom: var(--space-1);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.callout__body p { font-size: var(--text-sm); margin: 0; line-height: var(--leading-relaxed); }

.callout--info    { background: #eff6ff; border-color: var(--color-accent); }
.callout--info    .callout__title { color: var(--color-accent); }

.callout--tip     { background: #f0fdf4; border-color: var(--color-success); }
.callout--tip     .callout__title { color: var(--color-success); }

.callout--warning { background: #fffbeb; border-color: var(--color-accent-warm); }
.callout--warning .callout__title { color: var(--color-accent-warm-dark); }

.callout--danger  { background: #fef2f2; border-color: var(--color-danger); }
.callout--danger  .callout__title { color: var(--color-danger); }

.callout--pro     { background: #faf5ff; border-color: #7c3aed; }
.callout--pro     .callout__title { color: #7c3aed; }

/* --------------------------------------------------------------------------
   23. Utilities
   -------------------------------------------------------------------------- */
/* Display */
.d-none     { display: none !important; }
.d-block    { display: block !important; }
.d-flex     { display: flex !important; }
.d-grid     { display: grid !important; }
.d-inline   { display: inline !important; }
.d-inline-flex { display: inline-flex !important; }

/* Flex */
.flex-col   { flex-direction: column; }
.flex-wrap  { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start  { align-items: flex-start; }
.justify-between { justify-content: space-between; }
.justify-center  { justify-content: center; }
.gap-2      { gap: var(--space-2); }
.gap-4      { gap: var(--space-4); }
.gap-6      { gap: var(--space-6); }
.gap-8      { gap: var(--space-8); }

/* Spacing */
.mt-0 { margin-top: 0; }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mt-12 { margin-top: var(--space-12); }
.mb-0 { margin-bottom: 0; }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.mx-auto { margin-inline: auto; }
.py-4 { padding-block: var(--space-4); }
.py-8 { padding-block: var(--space-8); }
.py-12 { padding-block: var(--space-12); }
.py-16 { padding-block: var(--space-16); }

/* Text */
.text-center  { text-align: center; }
.text-right   { text-align: right; }
.text-left    { text-align: left; }
.text-xs      { font-size: var(--text-xs); }
.text-sm      { font-size: var(--text-sm); }
.text-base    { font-size: var(--text-base); }
.text-lg      { font-size: var(--text-lg); }
.text-xl      { font-size: var(--text-xl); }
.text-2xl     { font-size: var(--text-2xl); }
.text-muted   { color: var(--color-text-muted); }
.text-light   { color: var(--color-text-light); }
.text-accent  { color: var(--color-accent); }
.text-warm    { color: var(--color-accent-warm); }
.font-normal  { font-weight: var(--fw-normal); }
.font-medium  { font-weight: var(--fw-medium); }
.font-semibold { font-weight: var(--fw-semibold); }
.font-bold    { font-weight: var(--fw-bold); }
.uppercase    { text-transform: uppercase; }
.tracking-wide { letter-spacing: 0.06em; }
.leading-tight { line-height: var(--leading-tight); }

/* Width */
.w-full { width: 100%; }
.max-w-prose { max-width: 70ch; }

/* Colours */
.bg-subtle  { background: var(--color-bg-subtle); }
.bg-muted   { background: var(--color-bg-muted); }
.bg-accent  { background: var(--color-accent); color: #fff; }

/* Borders */
.border       { border: 1px solid var(--color-border); }
.border-top   { border-top: 1px solid var(--color-border); }
.border-bottom { border-bottom: 1px solid var(--color-border); }
.rounded      { border-radius: var(--radius-md); }
.rounded-lg   { border-radius: var(--radius-lg); }
.rounded-xl   { border-radius: var(--radius-xl); }
.rounded-full { border-radius: var(--radius-full); }

/* Overflow */
.overflow-hidden { overflow: hidden; }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* Visually hidden (accessible) */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* --------------------------------------------------------------------------
   24. Divider
   -------------------------------------------------------------------------- */
.divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-8) 0;
}
.divider--sm { margin: var(--space-4) 0; }

/* --------------------------------------------------------------------------
   25. Sticky position helper
   -------------------------------------------------------------------------- */
.sticky-top {
  position: sticky;
  top: calc(var(--header-height) + var(--space-6));
}

/* --------------------------------------------------------------------------
   26. Pagination
   -------------------------------------------------------------------------- */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-8) 0;
}
.pagination__link {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 var(--space-3);
  font-size: var(--text-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text-muted);
  text-decoration: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}
.pagination__link:hover {
  background: var(--color-bg-subtle);
  color: var(--color-text);
  border-color: var(--color-border-strong);
}
.pagination__link--active {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}
.pagination__link--active:hover {
  background: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  color: #fff;
}
.pagination__link--disabled {
  opacity: 0.4;
  pointer-events: none;
}

/* --------------------------------------------------------------------------
   27. Print
   -------------------------------------------------------------------------- */
@media print {
  .site-header,
  .site-footer,
  .mobile-nav,
  .nav-toggle,
  .breadcrumb,
  .widget { display: none !important; }
  body { font-size: 12pt; color: #000; }
  a { color: #000; text-decoration: underline; }
  .prose { max-width: 100%; }
}