/* ============================================================
Airlixr Systems — Paper Design System
============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@300;400;500;600;700&display=swap');

/* ── Tokens ── */
:root {
  /* Paper palette */
  --paper-50:  #FCFCF9;
  --paper-100: #EFEFE4;
  --paper-200: #DEDECB;
  --gray-50:  #F5F5F2;
  --gray-100: #EAEAE7;
  --gray-200: #D7D7D6;
  --gray-300: #C1C1C0;
  --gray-400: #A8A8A8;
  --gray-500: #909090;
  --gray-600: #666666;
  --gray-700: #5B5B5B;
  --gray-800: #424242;
  --gray-900: #2C2C2C;
  --gray-950: #222222;
  --blue-300: #A4C6F7;
  --blue-400: #81ADEC;
  --blue-500: #5D8CD7;
  --pink-100: #EED4F2;

  /* Semantic — Light */
  --bg-root:        var(--paper-100);
  --bg-surface:     #FFFFFF;
  --bg-cream:       var(--paper-100);
  --bg-raised:      var(--gray-50);
  --fg:             var(--gray-950);
  --fg-muted:       var(--gray-500);
  --fg-subtle:      var(--gray-400);
  --border:         var(--paper-200);
  --border-dark:    var(--gray-900);
  --blue:           var(--blue-400);
  --focus:          var(--blue-400);
  --accent:         var(--blue-400);
  --nav-bg:         rgba(239,239,228,0.88);
  --nav-text:       var(--gray-950);

  --vignette: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5));

  /* Typography */
  --font: 'Montserrat', system-ui, sans-serif;

  /* Radius */
  --r-base: 6px;
  --r-sm:   4px;
  --r-pill: 9999px;

  /* Spacing */
  --section-py: 90px;
  --container-max: 1080px;
  --card-pad: 40px;
}

/* ── Data-theme dark (JS toggle) ── */
[data-theme="dark"] {
  --bg-root:    var(--gray-950);
  --bg-surface: var(--gray-900);
  --bg-cream:   var(--gray-900);
  --bg-raised:  var(--gray-950);
  --fg:         var(--paper-100);
  --fg-muted:   var(--gray-400);
  --fg-subtle:  var(--gray-600);
  --border:     var(--gray-800);
  --border-dark:var(--gray-800);
  --nav-bg:     rgba(34,34,34,0.92);
  --nav-text:   var(--paper-100);
}
[data-theme="dark"] p { color: rgba(239,239,228,0.9); }
[data-theme="dark"] .nav { background: var(--nav-bg); }
[data-theme="dark"] .region-pill { outline-color: rgba(255,255,255,0.1); }
[data-theme="dark"] .card { outline-color: rgba(255,255,255,0.08); }
[data-theme="dark"] .card--interactive:hover { outline-color: rgba(255,255,255,0.2); }
[data-theme="dark"] .blog-card { outline-color: rgba(255,255,255,0.08); }
[data-theme="dark"] .blog-card:hover { outline-color: rgba(255,255,255,0.2); }
[data-theme="dark"] .sidebar-card { outline-color: rgba(255,255,255,0.08); }
[data-theme="dark"] .form-input::placeholder,
[data-theme="dark"] .form-textarea::placeholder { color: rgba(239,239,228,0.35); }
[data-theme="dark"] .mobile-menu { background: rgba(34,34,34,0.96); }
[data-theme="dark"] .spec-list li { border-bottom-color: rgba(255,255,255,0.05); }
[data-theme="dark"] .data-table td { color: rgba(254,250,252,0.85); border-bottom-color: rgba(255,255,255,0.05); }
[data-theme="dark"] .article-body li { color: rgba(254,250,252,0.8); }
[data-theme="dark"] .btn--dark { background: #fff; color: var(--gray-950); }
[data-theme="dark"] .btn--dark:hover { background: var(--paper-100); }
[data-theme="dark"] .btn--outline:hover { background: rgba(255,255,255,0.06); }

/* ── System preference fallback (no JS / no toggle set) ── */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]):not([data-theme="dark"]) {
    --bg-root:    var(--gray-950);
    --bg-surface: var(--gray-900);
    --bg-cream:   var(--gray-900);
    --bg-raised:  var(--gray-950);
    --fg:         var(--paper-100);
    --fg-muted:   var(--gray-400);
    --fg-subtle:  var(--gray-600);
    --border:     var(--gray-800);
    --border-dark:var(--gray-800);
    --nav-bg:     rgba(34,34,34,0.92);
    --nav-text:   var(--paper-100);
  }
  :root:not([data-theme="light"]):not([data-theme="dark"]) p { color: rgba(239,239,228,0.9); }
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  font-family: var(--font);
  background: var(--bg-root);
  color: var(--fg);
  font-size: 18px;
  line-height: 28px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── Typography ── */
h1 { font-size: 40px; line-height: 48px; font-weight: 500; color: var(--fg); }
h2 { font-size: 30px; line-height: 38px; font-weight: 500; color: var(--fg); }
h3 { font-size: 24px; line-height: 32px; font-weight: 500; color: var(--fg); }
h4 { font-size: 18px; line-height: 28px; font-weight: 500; color: var(--fg); }
h5 { font-size: 16px; line-height: 24px; font-weight: 500; color: var(--fg); }
p  { color: rgba(34,34,34,0.9); line-height: 28px; }
@media (prefers-color-scheme: dark) {
  p { color: rgba(239,239,228,0.9); }
}

@media (min-width: 900px) {
  h1 { font-size: 48px; line-height: 52px; }
  h2 { font-size: 40px; line-height: 48px; }
  h3 { font-size: 30px; line-height: 38px; }
  h4 { font-size: 24px; line-height: 32px; }
}
@media (min-width: 1471px) {
  h1 { font-size: 64px; line-height: 68px; }
  h2 { font-size: 48px; line-height: 52px; }
  h3 { font-size: 40px; line-height: 48px; }
}

/* ── Container ── */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 16px;
}
@media (min-width: 640px)  { .container { padding: 0 28px; } }
@media (min-width: 1140px) { .container { padding: 0; } }

/* ── Section ── */
.section {
  padding: 60px 0;
  position: relative;
  overflow: hidden;
}
@media (min-width: 900px) { .section { padding: var(--section-py) 0; } }

/* Paper grain — applied on every section */
.section::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23n)' opacity='1'/%3E%3C/svg%3E");
  opacity: 0.025;
  mix-blend-mode: multiply;
  pointer-events: none;
  z-index: 0;
}
@media (prefers-color-scheme: dark) {
  .section::before { opacity: 0.04; mix-blend-mode: overlay; }
}
.section > * { position: relative; z-index: 1; }

/* Alternate section backgrounds */
.section--cream { background: var(--bg-cream); }
.section--surface { background: var(--bg-surface); }
.section--dark {
  background: var(--gray-950);
  --fg: var(--paper-100);
  --fg-muted: var(--gray-400);
  --border: var(--gray-800);
}
.section--dark p { color: rgba(239,239,228,0.75); }
.section--dark h1,
.section--dark h2,
.section--dark h3,
.section--dark h4 { color: var(--paper-100); }

/* ── Eyebrow ── */
.eyebrow {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 12px;
}

/* ── Divider ── */
.divider {
  width: 40px;
  height: 1px;
  background: var(--border-dark);
  margin-bottom: 24px;
}
.section--dark .divider { background: var(--gray-600); }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font);
  font-size: 16px;
  font-weight: 500;
  padding: 10px 18px;
  border-radius: var(--r-base);
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s ease-out, transform 0.1s ease-out, outline-color 0.15s;
  outline: 2px solid transparent;
  outline-offset: 2px;
  line-height: 1;
}
.btn:focus-visible { outline-color: var(--focus); }
.btn:active { transform: scale(0.97); }

.btn--primary {
  background: linear-gradient(to bottom, var(--blue-400), var(--blue-500));
  color: var(--paper-50) !important;
  box-shadow: inset 0 1px rgba(255,255,255,0.12), inset 0 -1px rgba(0,0,0,0.12); */
}
.btn--primary:hover { 
  background: linear-gradient(to bottom, var(--blue-300), var(--blue-500));
  color: var(--paper-200);
}

.btn--dark {
  background: var(--gray-950);
  color: var(--paper-100);
}
.btn--dark:hover { background: #000; }
@media (prefers-color-scheme: dark) {
  .btn--dark { background: #fff; color: var(--gray-950); }
  .btn--dark:hover { background: var(--paper-100); }
}

.btn--outline {
  background: rgba(129,173,236,0.08);
  border: 1px solid var(--border);
  color: var(--fg);
}
.btn--outline:hover { background: rgba(0,0,0,0.04); }
@media (prefers-color-scheme: dark) {
  .btn--outline:hover { background: rgba(255,255,255,0.06); }
}

.btn--ghost {
  background: transparent;
  color: var(--fg);
}
.btn--ghost:hover { background: rgba(0,0,0,0.05); }

.btn--lg { font-size: 18px; padding: 12px 24px; }
.btn--sm { font-size: 14px; padding: 7px 12px; }

/* ── Cards ── */
.card {
  background: var(--bg-surface);
  outline: 1px solid rgba(0,0,0,0.06);
  border-radius: var(--r-base);
  overflow: hidden;
  padding: var(--card-pad);
}
@media (prefers-color-scheme: dark) {
  .card { outline-color: rgba(255,255,255,0.1); }
}
.card--interactive { cursor: pointer; transition: outline-color 0.15s; text-decoration: none; display: block; color: inherit; }
.card--interactive:hover { outline-color: rgba(0,0,0,0.16); }
@media (prefers-color-scheme: dark) {
  .card--interactive:hover { outline-color: rgba(255,255,255,0.2); }
}
.card--sm { padding: 24px; }
.card--flush { padding: 0; }

/* ── Badges ── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  font-weight: 500;
  padding: 2px 8px;
  border-radius: 8px;
  border: 1px solid transparent;
}
.badge--blue {
  background: rgba(161,198,247,0.15);
  border-color: rgba(129,173,236,0.3);
  color: var(--blue-500);
}
@media (prefers-color-scheme: dark) { .badge--blue { color: var(--blue-300); } }
.badge--neutral {
  background: rgba(0,0,0,0.04);
  border-color: rgba(0,0,0,0.08);
  color: var(--fg);
}
.badge--dark {
  background: var(--gray-950);
  color: var(--paper-100);
  border-color: transparent;
}

/* ── Inputs ── */
.form-group { margin-bottom: 20px; }
.form-label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--fg);
  margin-bottom: 8px;
}
.form-input,
.form-select,
.form-textarea {
  display: block;
  width: 100%;
  font-family: var(--font);
  font-size: 16px;
  color: var(--fg);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--r-base);
  padding: 10px 12px;
  transition: border-color 0.15s;
  outline: none;
}
.form-input::placeholder,
.form-textarea::placeholder { color: rgba(34,34,34,0.4); }
@media (prefers-color-scheme: dark) {
  .form-input::placeholder,
  .form-textarea::placeholder { color: rgba(239,239,228,0.35); }
}
.form-input:hover,
.form-select:hover,
.form-textarea:hover { border-color: var(--border-dark); }
.form-input:focus,
.form-select:focus,
.form-textarea:focus { border: 2px solid var(--focus); padding: 9px 11px; }
.form-textarea { resize: vertical; min-height: 140px; line-height: 1.6; }

/* ── Nav ── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 200;
  background: var(--nav-bg, rgba(254,250,252,0.88));
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  height: 64px;
}
@media (prefers-color-scheme: dark) {
  .nav {  }
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 16px;
}
@media (min-width: 640px) { .nav-inner { padding: 0 28px; } }
@media (min-width: 1140px) { .nav-inner { padding: 0; } }

.nav-logo {
  font-size: 16px;
  font-weight: 600;
  color: var(--nav-text, var(--gray-950));
  text-decoration: none;
  letter-spacing: -0.01em;
}
.nav-logo span { color: var(--blue-500); }

.nav-links {
  display: none;
  list-style: none;
  gap: 2rem;
}
@media (min-width: 768px) { .nav-links { display: flex; align-items: center; } }
.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--fg-muted);
  text-decoration: none;
  transition: color 0.15s;
}
.nav-links a:hover,
.nav-links a.active { color: var(--fg); }

.nav-burger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 6px;
  background: none;
  border: none;
}
@media (min-width: 768px) { .nav-burger { display: none; } }
.nav-burger span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--fg);
  transition: 0.2s;
}

.mobile-menu {
  display: none;
  flex-direction: column;
  position: fixed;
  top: 64px; left: 0; right: 0;
  
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 199;
  padding: 16px 28px 24px;
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  font-size: 16px;
  font-weight: 500;
  color: var(--fg-muted);
  text-decoration: none;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}
.mobile-menu a:last-child { border-bottom: none; color: var(--blue-500); }

/* ── Footer ── */
.footer {
  background: var(--gray-950);
  padding: 60px 0 32px;
  position: relative;
  overflow: hidden;
  background-image: var(--vignette), url("./assets/airlixr-footer.png");
  background-repeat: no-repeat !important;
  background-position: center !important;
  background-size: cover !important;
}
.footer::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23n)' opacity='1'/%3E%3C/svg%3E");
  opacity: 0.04;
  mix-blend-mode: overlay;
  pointer-events: none;
}
.footer > * { position: relative; z-index: 1; }
.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  margin-bottom: 48px;
}
@media (min-width: 640px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (min-width: 900px) {
  .footer-grid { grid-template-columns: 2fr 1fr 1fr 1fr; }
}
.footer-logo {
  font-size: 15px;
  font-weight: 600;
  color: var(--paper-100);
  text-decoration: none;
  display: block;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}
.footer-logo span { color: var(--blue-400); }
.footer-desc { font-size: 14px; color: var(--gray-500); line-height: 22px; max-width: 240px; }
.footer-col h5 {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #C8D65C;
  margin-bottom: 16px;
}
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a {
  font-size: 14px;
  color: var(--gray-300);
  text-decoration: none;
  transition: color 0.15s;
}
.footer-col ul li a:hover { color: var(--paper-100); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}
.footer-bottom p { font-size: 13px; color: var(--gray-400); }

/* ── Page Hero (inner pages) ── */
.page-hero {
  background: var(--gray-950);
  padding: calc(64px + 80px) 0 80px;
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23n)' opacity='1'/%3E%3C/svg%3E");
  opacity: 0.04;
  mix-blend-mode: overlay;
  pointer-events: none;
}
.page-hero > .container { position: relative; z-index: 1; }
.page-hero h1 { color: var(--paper-100); }
.page-hero .lead { color: rgba(239,239,228,0.6); font-size: 18px; max-width: 560px; margin-top: 16px; }

.hero-image-section{
  background-repeat: no-repeat !important;
  background-position: center !important;
  background-size: cover !important;
}

.hr-img-index{
  background-image: var(--vignette), url('./assets/index-hero-image.png') !important;
}
.hr-img-about{
  background-image: var(--vignette), url('./assets/about-hero-image.png') !important;
}

/* ── Region pills ── */
.region-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}
.region-pill {
  font-size: 13px;
  font-weight: 500;
  color: var(--fg);
  background: var(--bg-surface);
  outline: 1px solid rgba(0,0,0,0.08);
  border-radius: var(--r-base);
  padding: 6px 14px;
}
@media (prefers-color-scheme: dark) {
  .region-pill { outline-color: rgba(255,255,255,0.1); }
}

/* ── Data table ── */
.data-table { width: 100%; border-collapse: collapse; font-size: 15px; margin: 28px 0; }
.data-table th {
  text-align: left;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-muted);
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
}
.data-table td {
  padding: 12px 16px;
  border-bottom: 1px solid rgba(0,0,0,0.04);
  color: rgba(34,34,34,0.9);
  vertical-align: top;
}
@media (prefers-color-scheme: dark) {
  .data-table td { color: rgba(239,239,228,0.85); border-bottom-color: rgba(255,255,255,0.05); }
}
.data-table td:first-child { font-weight: 500; }

/* ── Callout ── */
.callout {
  background: var(--bg-cream);
  outline: 1px solid var(--border);
  border-left: 3px solid var(--blue-400);
  border-radius: 0 var(--r-base) var(--r-base) 0;
  padding: 20px 24px;
  margin: 28px 0;
}
.callout p { font-size: 15px; margin: 0; }

/* ── Spec list ── */
.spec-list { list-style: none; margin-top: 20px; }
.spec-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 15px;
  color: var(--fg-muted);
  padding: 8px 0;
  border-bottom: 1px solid rgba(0,0,0,0.04);
}
@media (prefers-color-scheme: dark) { .spec-list li { border-bottom-color: rgba(255,255,255,0.05); } }
.spec-list li::before {
  content: '';
  width: 5px;
  height: 5px;
  border-radius: var(--r-pill);
  background: var(--blue-400);
  flex-shrink: 0;
  margin-top: 8px;
}

/* ── Gallery grid ── */
.gallery-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--border);
  outline: 1px solid var(--border);
  border-radius: var(--r-base);
  overflow: hidden;
}
@media (min-width: 640px) { .gallery-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 900px) { .gallery-grid { grid-template-columns: repeat(3, 1fr); } }
.gallery-item {
  background: var(--bg-cream);
  aspect-ratio: 4/3;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}
@media (min-width: 900px) {
  .gallery-item:nth-child(1) { grid-column: span 2; }
  .gallery-item:nth-child(4) { grid-column: span 2; }
}
.gallery-placeholder { text-align: center; padding: 24px; }
.gallery-placeholder svg { opacity: 0.18; margin-bottom: 12px; }
.gallery-placeholder p { font-size: 13px; color: var(--fg-muted); line-height: 1.5; }
.gallery-label {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  background: linear-gradient(transparent, rgba(34,34,34,0.8));
  padding: 24px 16px 14px;
  font-size: 13px;
  font-weight: 500;
  color: var(--paper-100);
}

/* ── Blog card ── */
.blog-card {
  display: block;
  text-decoration: none;
  color: inherit;
  background: var(--bg-surface);
  outline: 1px solid rgba(0,0,0,0.06);
  border-radius: var(--r-base);
  overflow: hidden;
  transition: outline-color 0.15s;
}
.blog-card:hover { outline-color: rgba(0,0,0,0.16); }
@media (prefers-color-scheme: dark) {
  .blog-card { outline-color: rgba(255,255,255,0.1); }
  .blog-card:hover { outline-color: rgba(255,255,255,0.2); }
}
.blog-card-thumb {
  background: var(--gray-950);
  padding: 28px;
  min-height: 100px;
  display: flex;
  align-items: flex-end;
  position: relative;
  overflow: hidden;
}
.blog-card-thumb::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23n)' opacity='1'/%3E%3C/svg%3E");
  opacity: 0.06;
  mix-blend-mode: overlay;
}
.blog-card-body { padding: 24px; }
.blog-card-meta { font-size: 13px; color: var(--fg-muted); margin-bottom: 10px; }
.blog-card-title { font-size: 17px; font-weight: 500; line-height: 1.4; color: var(--fg); margin-bottom: 10px; }
.blog-card-excerpt { font-size: 14px; color: var(--fg-muted); line-height: 1.6; margin-bottom: 16px; }
.blog-card-link { font-size: 13px; font-weight: 500; color: var(--blue-500); }

/* ── Sidebar (blog) ── */
.blog-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  padding: 60px 0;
}
@media (min-width: 900px) {
  .blog-layout { grid-template-columns: 1fr 300px; gap: 64px; }
}
.sidebar { display: flex; flex-direction: column; gap: 20px; }
@media (min-width: 900px) { .sidebar { position: sticky; top: 84px; } }
.sidebar-card {
  background: var(--bg-surface);
  outline: 1px solid rgba(0,0,0,0.06);
  border-radius: var(--r-base);
  padding: 24px;
}
@media (prefers-color-scheme: dark) { .sidebar-card { outline-color: rgba(255,255,255,0.1); } }
.sidebar-card h5 {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin-bottom: 16px;
}
.sidebar-nav-link {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--fg-muted);
  text-decoration: none;
  padding: 8px 0;
  border-bottom: 1px solid rgba(0,0,0,0.04);
  transition: color 0.15s;
}
.sidebar-nav-link:last-child { border-bottom: none; }
.sidebar-nav-link:hover { color: var(--fg); }
.tag-cloud { display: flex; flex-wrap: wrap; gap: 6px; }

/* ── Article body ── */
.article-body h2 { margin-top: 40px; margin-bottom: 16px; font-size: 24px; line-height: 32px; }
.article-body h3 { margin-top: 28px; margin-bottom: 10px; font-size: 18px; line-height: 26px; }
.article-body p { margin-bottom: 20px; font-size: 17px; line-height: 1.75; }
.article-body ul, .article-body ol { padding-left: 24px; margin-bottom: 20px; }
.article-body li { font-size: 16px; line-height: 1.7; margin-bottom: 8px; color: rgba(34,34,34,0.85); }
@media (prefers-color-scheme: dark) { .article-body li { color: rgba(239,239,228,0.8); } }
.article-intro {
  font-size: 18px;
  line-height: 1.75;
  color: var(--fg-muted);
  padding-bottom: 32px;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--border);
}

/* ── Trust bar ── */
.trust-bar {
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 20px 0;
}
.trust-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  align-items: center;
}
.trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 500;
  color: var(--fg-muted);
}
.trust-dot {
  width: 5px; height: 5px;
  border-radius: var(--r-pill);
  background: var(--blue-400);
  flex-shrink: 0;
}

/* ── Responsive utilities ── */
@media (max-width: 767px) {
  .hide-mobile { display: none !important; }
}

/* ── Theme Toggle ── */
.theme-toggle-label {
  display: flex;
  align-items: center;
  cursor: pointer;
  margin-left: 8px;
  flex-shrink: 0;
}
.toggle-checkbox {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}
.toggle-slot {
  position: relative;
  width: 44px;
  height: 24px;
  border-radius: 12px;
  background: var(--paper-200);
  border: 1px solid var(--border);
  transition: background 250ms, border-color 250ms;
  flex-shrink: 0;
  overflow: visible;
}
.toggle-checkbox:checked ~ .toggle-slot {
  background: var(--gray-800);
  border-color: var(--gray-700);
}
.toggle-button {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 3px rgba(0,0,0,0.18);
  transition: transform 300ms cubic-bezier(.26,2,.46,.71), background 200ms;
  display: flex;
  align-items: center;
  justify-content: center;
}
.toggle-checkbox:checked ~ .toggle-slot .toggle-button {
  transform: translateX(20px);
  background: var(--blue-400);
}
/* icons inside button */
.sun-icon-wrapper,
.moon-icon-wrapper {
  position: absolute;
  width: 12px;
  height: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 200ms;
}
.sun-icon-wrapper { opacity: 1; }
.moon-icon-wrapper { opacity: 0; }
.toggle-checkbox:checked ~ .toggle-slot .toggle-button .sun-icon-wrapper { opacity: 0; }
.toggle-checkbox:checked ~ .toggle-slot .toggle-button .moon-icon-wrapper { opacity: 1; }
.sun-icon, .moon-icon {
  width: 12px;
  height: 12px;
  color: var(--gray-950);
}
.toggle-checkbox:checked ~ .toggle-slot .toggle-button .moon-icon { color: var(--paper-100); }
.toggle-checkbox:focus-visible ~ .toggle-slot {
  outline: 2px solid var(--blue-400);
  outline-offset: 2px;
}