/* Aviground theme — ported from the React + Tailwind site */

:root {
  color-scheme: dark;

  --color-sky-950: #09132d;
  --color-sky-900: #0f1a3c;
  --color-sky-850: #122144;
  --color-sky-800: #152751;
  --color-sky-700: #1c3363;
  --color-sky-600: #244577;
  --color-sky-500: #3060a4;
  --color-sky-400: #5e8dcf;
  --color-sky-300: #94b6e5;
  --color-sky-200: #cddef4;

  --discord: #5865f2;
  --text: #e7edf7;

  --font-sans: 'Inter', system-ui, 'Segoe UI', Roboto, sans-serif;

  --maxw: 80rem;      /* max-w-7xl */
  --maxw-3: 48rem;    /* max-w-3xl */
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background-color: var(--color-sky-950);
  color: var(--text);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.5;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

/* ---------- layout helpers ---------- */

.wrap {
  margin-inline: auto;
  max-width: var(--maxw);
  padding-inline: 1.5rem;
  width: 100%;
}

.wrap-narrow {
  margin-inline: auto;
  max-width: var(--maxw-3);
  padding-inline: 1.5rem;
  width: 100%;
}

.section {
  padding-block: 6rem;
  padding-inline: 1.5rem;
}

.section--tight {
  padding-block: 3.5rem;
}

.section--band {
  border-block: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(15, 26, 60, 0.4);
}

.eyebrow {
  margin: 0 0 0.75rem;
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-sky-300);
}

h1,
h2,
h3 {
  margin: 0;
  color: #fff;
  font-weight: 800;
  line-height: 1.15;
}

h2 {
  font-size: 2.25rem;
}

.lead {
  color: rgba(231, 237, 247, 0.8);
}

.muted {
  color: rgba(205, 222, 244, 0.6);
}

/* ---------- buttons ---------- */

.btn {
  display: inline-block;
  border-radius: 9999px;
  padding: 1rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  transition: background-color 0.2s, color 0.2s, transform 0.2s, border-color 0.2s;
  cursor: pointer;
}

.btn--primary {
  background: var(--color-sky-400);
  color: var(--color-sky-950);
}

.btn--primary:hover {
  background: var(--color-sky-300);
}

.btn--ghost {
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #fff;
}

.btn--ghost:hover {
  background: rgba(255, 255, 255, 0.1);
}

.btn--sm {
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 600;
}

/* ---------- header ---------- */

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  border-bottom: 1px solid transparent;
  background: rgba(9, 19, 45, 0.4);
  backdrop-filter: blur(12px);
  transition: background-color 0.3s, border-color 0.3s, box-shadow 0.3s;
}

.site-header.is-scrolled {
  border-bottom-color: rgba(255, 255, 255, 0.1);
  background: rgba(9, 19, 45, 0.95);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.2);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-inline: auto;
  max-width: var(--maxw);
  padding: 1rem 1.5rem;
  transition: padding 0.3s;
}

.site-header.is-scrolled .site-header__inner {
  padding-block: 0.5rem;
}

.site-header__logo img {
  height: 3.5rem;
  width: auto;
  object-fit: contain;
  transition: height 0.3s;
}

.site-header.is-scrolled .site-header__logo img {
  height: 1.25rem;
}

.site-nav {
  display: none;
  align-items: center;
  gap: 0.25rem;
}

.site-nav a {
  border-radius: 9999px;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: rgba(205, 222, 244, 0.7);
  transition: color 0.2s, background-color 0.2s;
}

.site-nav a:hover {
  color: #fff;
}

.site-nav a.is-active {
  background: rgba(94, 141, 207, 0.15);
  color: var(--color-sky-200);
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: 0.9rem;
}

.site-header__cta {
  display: none;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 9999px;
  overflow: hidden;
}

.lang-switch__opt {
  padding: 0.3rem 0.6rem;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  color: rgba(205, 222, 244, 0.6);
  transition: background-color 0.2s, color 0.2s;
}

.lang-switch__opt + .lang-switch__opt {
  border-left: 1px solid rgba(255, 255, 255, 0.14);
}

.lang-switch__opt:hover {
  color: #fff;
}

.lang-switch__opt.is-active {
  background: var(--color-sky-400);
  color: var(--color-sky-950);
}

.mobile-nav__langs {
  display: flex;
  gap: 0.5rem;
  padding: 0.25rem 0.75rem 0.5rem;
}

.mobile-nav__langs a {
  padding: 0.3rem 0.7rem;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 700;
}

.mobile-nav__langs a.is-active {
  background: var(--color-sky-400);
  color: var(--color-sky-950);
}

.nav-toggle {
  display: flex;
  height: 2.25rem;
  width: 2.25rem;
  align-items: center;
  justify-content: center;
  border-radius: 9999px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: none;
  color: #fff;
  font-size: 1rem;
  cursor: pointer;
}

.mobile-nav {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 1rem 1.5rem;
}

.mobile-nav[hidden] {
  display: none;
}

.mobile-nav a {
  border-radius: 0.5rem;
  padding: 0.5rem 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: rgba(205, 222, 244, 0.7);
}

.mobile-nav a.is-active {
  background: rgba(94, 141, 207, 0.15);
  color: var(--color-sky-200);
}

.mobile-nav__sep {
  display: block;
  margin: 0.5rem 0.75rem 0.25rem;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: rgba(205, 222, 244, 0.4);
}

@media (min-width: 768px) {
  .site-nav {
    display: flex;
  }
  .site-header__cta {
    display: inline-block;
  }
  .nav-toggle {
    display: none;
  }
  .mobile-nav {
    display: none !important;
  }
}

@media (max-width: 767px) {
  .site-header__actions .lang-switch {
    display: none;
  }
}

/* ---------- vertical side nav (home page only) ---------- */

.side-nav {
  display: none;
}

@media (min-width: 1100px) {
  .side-nav {
    position: fixed;
    top: 50%;
    left: 1.75rem;
    z-index: 45;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    transform: translateY(-50%);
  }

  .side-nav a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 0.5rem;
    border-radius: 9999px;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    color: rgba(205, 222, 244, 0.55);
    transition: color 0.2s;
  }

  .side-nav__dot {
    display: block;
    height: 0.55rem;
    width: 0.55rem;
    flex-shrink: 0;
    border-radius: 9999px;
    border: 1px solid rgba(148, 182, 229, 0.5);
    background: transparent;
    transition: background-color 0.2s, border-color 0.2s, transform 0.2s;
  }

  .side-nav__label {
    opacity: 0;
    transform: translateX(-4px);
    transition: opacity 0.2s, transform 0.2s;
  }

  .side-nav a:hover {
    color: #fff;
  }

  .side-nav a:hover .side-nav__label {
    opacity: 1;
    transform: translateX(0);
  }

  .side-nav a.is-active {
    color: var(--color-sky-200);
  }

  .side-nav a.is-active .side-nav__dot {
    background: var(--color-sky-300);
    border-color: var(--color-sky-300);
    transform: scale(1.15);
  }

  .side-nav a.is-active .side-nav__label {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ---------- hero ---------- */

.hero {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 100vh;
  overflow: hidden;
  padding: 6rem 1.5rem 0;
}

.hero__video {
  position: absolute;
  inset: 0;
  height: 100%;
  width: 100%;
  object-fit: cover;
  will-change: transform;
}

.hero__scrim {
  position: absolute;
  inset: 0;
  background: rgba(9, 19, 45, 0.7);
  pointer-events: none;
}

.hero__grid {
  position: relative;
  display: grid;
  align-items: center;
  gap: 3rem;
  margin-inline: auto;
  max-width: var(--maxw);
  width: 100%;
}

.hero h1 {
  font-size: clamp(3rem, 8vw, 4.5rem);
  font-weight: 800;
}

.hero__text .lead {
  margin-top: 2rem;
  max-width: 36rem;
  font-size: 1.25rem;
}

.hero__actions {
  margin-top: 2.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.hero__art {
  display: flex;
  justify-content: center;
}

.hero__art img {
  width: 100%;
  filter: drop-shadow(0 25px 25px rgba(0, 0, 0, 0.4));
}

.hero__scroll {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  color: rgba(205, 222, 244, 0.5);
  animation: bounce 1s infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(-25%); }
  50% { transform: translateX(-50%) translateY(0); }
}

@media (min-width: 768px) {
  .hero__grid {
    grid-template-columns: 1fr 1fr;
  }
  .hero__art {
    justify-self: end;
    width: 120%;
    margin-left: auto;
  }
}

/* ---------- stats ---------- */

.stats {
  border-block: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(15, 26, 60, 0.4);
  padding: 3.5rem 1.5rem;
}

.stats__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  margin-inline: auto;
  max-width: var(--maxw);
  text-align: center;
}

.stat__value {
  margin: 0;
  font-size: 2.25rem;
  font-weight: 800;
  color: #fff;
}

.stat__label {
  margin: 0.5rem 0 0;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-sky-300);
}

.stat__desc {
  margin: 0.25rem 0 0;
  font-size: 0.75rem;
  color: rgba(205, 222, 244, 0.6);
}

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

/* ---------- about ---------- */

.about__grid {
  display: grid;
  gap: 3rem;
  margin-inline: auto;
  max-width: var(--maxw);
}

.about__body .lead + .lead {
  margin-top: 1rem;
}

.about__body h2 {
  margin-top: 0;
}

.about__cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.card {
  border-radius: 1rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(15, 26, 60, 0.4);
  padding: 1.25rem;
}

.card__title {
  margin: 0;
  font-weight: 600;
  color: #fff;
}

.card__desc {
  margin: 0.5rem 0 0;
  font-size: 0.875rem;
  color: rgba(205, 222, 244, 0.6);
}

@media (min-width: 768px) {
  .about__grid {
    grid-template-columns: repeat(2, 1fr);
    align-items: center;
  }
}

/* ---------- interests ---------- */

.interests__head {
  margin-inline: auto;
  max-width: var(--maxw);
}

.interests {
  margin: 2.5rem auto 0;
  max-width: var(--maxw);
}

.interests__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.5rem;
  grid-template-columns: 1fr;
}

.interest {
  border-radius: 1rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(9, 19, 45, 0.6);
  /* the growth transition */
  transition: border-color 0.35s ease, box-shadow 0.35s ease,
    background-color 0.35s ease;
}

.interest__open {
  display: block;
  width: 100%;
  padding: 1.5rem;
  border: 0;
  background: none;
  color: inherit;
  text-align: left;
  font: inherit;
  cursor: pointer;
}

.interest h3 {
  font-size: 1.125rem;
  transition: color 0.2s;
}

.interest:hover {
  transform: translateY(-0.375rem);
  border-color: rgba(94, 141, 207, 0.4);
  box-shadow: 0 10px 15px -3px rgba(48, 96, 164, 0.1);
}

.interest:hover h3 {
  color: var(--color-sky-300);
}

.interest__open p {
  margin: 0.75rem 0 0;
  font-size: 0.875rem;
  color: rgba(205, 222, 244, 0.6);
  line-height: 1.55;
}

.interest__more {
  display: inline-block;
  margin-top: 1rem;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-sky-300);
}

/* hidden detail block for each card */
.interest__detail[hidden] {
  display: none;
}

.interest__detail {
  padding: 1.75rem;
  display: grid;
  gap: 1.75rem;
  grid-template-columns: 1fr;
  align-items: start;
}

.interest__back {
  display: inline-block;
  margin: 0 0 1.25rem;
  padding: 0.4rem 0.9rem;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 9999px;
  background: none;
  color: var(--color-sky-300);
  font: inherit;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}

.interest__back:hover {
  border-color: rgba(94, 141, 207, 0.5);
  color: #fff;
}

.interest__detail-main > h3 {
  clear: both;
  font-size: clamp(1.35rem, 3vw, 1.75rem);
  color: #fff;
}

.interest__detail-body {
  margin-top: 1rem;
}

.interest__detail-media {
  border-radius: 0.9rem;
  overflow: hidden;
  min-height: 12rem;
  align-self: stretch;
  position: relative;
  background: linear-gradient(135deg, var(--color-sky-800), var(--color-sky-950));
}

.interest__detail-media img {
  height: 100%;
  width: 100%;
  object-fit: cover;
}

.interest__detail-ph {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  text-align: center;
  font-size: clamp(1.1rem, 2.5vw, 1.6rem);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  line-height: 1.2;
  color: var(--cat, rgba(148, 182, 229, 0.35));
  background:
    radial-gradient(18rem 12rem at 70% 20%, var(--cat-soft, rgba(94, 141, 207, 0.22)), transparent 70%);
  opacity: 0.85;
}

@media (min-width: 820px) {
  .interest__detail {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  }
  .interest__detail-media {
    min-height: 100%;
  }
}

.interest__detail-body p {
  margin: 0 0 1rem;
  font-size: 0.98rem;
  line-height: 1.7;
  color: rgba(231, 237, 247, 0.8);
}

.interest__detail-body p:last-child {
  margin-bottom: 0;
}

.interest__detail-body strong {
  color: #fff;
}

.interest__detail-body :first-child {
  margin-top: 0;
}

/* ---- expanded state: one card fills the row, others collapse away ---- */
.interests__grid.is-open {
  grid-template-columns: 1fr;
}

.interests__grid.is-open .interest[hidden] {
  display: none;
}

.interests__grid.is-open .interest.is-active {
  border-color: rgba(94, 141, 207, 0.35);
  background: rgba(15, 26, 60, 0.55);
  box-shadow: 0 20px 45px -25px rgba(48, 96, 164, 0.5);
  transform: none;
}

.interests__grid.is-open .interest.is-active:hover {
  transform: none;
}

.interests__grid.is-open .interest.is-active .interest__open {
  display: none;
}

/* the grow animation applied on open */
@keyframes interest-grow {
  from {
    opacity: 0.4;
    transform: scale(0.94);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.interest.is-active {
  animation: interest-grow 0.32s ease-out;
}

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

@media (min-width: 1024px) {
  .interests__grid {
    grid-template-columns: repeat(5, 1fr);
  }
  .interest__open {
    padding: 1.35rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .interest,
  .interest.is-active {
    animation: none;
    transition: none;
  }
  .interest:hover {
    transform: none;
  }
}

/* ---------- community ---------- */

.community {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  background: linear-gradient(to bottom, var(--color-sky-950), #000);
  padding: 6rem 1.5rem;
  text-align: center;
}

.community h2 {
  font-size: clamp(2.25rem, 5vw, 3rem);
}

.community__inner {
  margin-inline: auto;
  max-width: var(--maxw-3);
}

.community__card {
  display: block;
  width: 100%;
  max-width: 24rem;
  margin: 2.5rem auto 0;
  border-radius: 1rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(0, 0, 0, 0.4);
  padding: 1.5rem;
  text-align: left;
  transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
}

.community__card:hover {
  transform: translateY(-0.25rem);
  border-color: rgba(88, 101, 242, 0.6);
  box-shadow: 0 10px 15px -3px rgba(88, 101, 242, 0.2);
}

.community__row {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.community__icon {
  display: flex;
  height: 3rem;
  width: 3rem;
  flex-shrink: 0;
  align-items: center;
  justify-content: center;
  border-radius: 9999px;
  background: var(--discord);
  box-shadow: 0 10px 15px -3px rgba(88, 101, 242, 0.3);
  transition: transform 0.3s;
}

.community__card:hover .community__icon {
  transform: scale(1.1);
}

.community__icon svg {
  height: 1.75rem;
  width: 1.75rem;
  color: #fff;
}

.community__card p:first-of-type {
  margin: 0;
  font-weight: 700;
  color: #fff;
}

.community__card p:last-of-type {
  margin: 0.25rem 0 0;
  font-size: 0.875rem;
  color: rgba(205, 222, 244, 0.6);
}

/* ---------- footer ---------- */

.site-footer {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(15, 26, 60, 0.6);
  padding: 3rem 1.5rem;
}

.site-footer__inner {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  margin-inline: auto;
  max-width: var(--maxw);
}

.site-footer__brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.site-footer__brand img {
  height: 2.5rem;
  width: 2.5rem;
  border-radius: 9999px;
}

.site-footer__brand p:first-child {
  margin: 0;
  font-weight: 700;
  color: #fff;
}

.site-footer__brand p:last-child {
  margin: 0;
  font-size: 0.875rem;
  color: rgba(205, 222, 244, 0.6);
}

.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 2rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-footer__links a {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: rgba(205, 222, 244, 0.7);
  transition: color 0.2s;
}

.site-footer__links a:hover {
  color: var(--discord);
}

.site-footer__links svg {
  height: 1.25rem;
  width: 1.25rem;
}

.site-footer__legal {
  margin-inline: auto;
  margin-top: 2.5rem;
  max-width: var(--maxw);
  width: 100%;
  font-size: 0.75rem;
  color: rgba(205, 222, 244, 0.4);
}

@media (min-width: 768px) {
  .site-footer__inner {
    flex-direction: row;
    align-items: flex-start;
    justify-content: space-between;
  }
}

/* ---------- reveal animation ---------- */

.reveal {
  opacity: 0;
  transform: translateY(2rem);
  transition: opacity 1.4s ease-out, transform 1.4s ease-out;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  html {
    scroll-behavior: auto;
  }
  .hero__scroll {
    animation: none;
  }
}

/* ---------- blog ---------- */

/* per-category colour system.
   Each category resolves to --cat (solid) + --cat-soft (tint).
   Unknown categories inherit the sky default below. */
[data-cat] {
  --cat: var(--color-sky-400);
  --cat-soft: rgba(94, 141, 207, 0.15);
  --cat-line: rgba(94, 141, 207, 0.4);
}
[data-cat="news"] {
  --cat: #5e8dcf;
  --cat-soft: rgba(94, 141, 207, 0.16);
  --cat-line: rgba(94, 141, 207, 0.45);
}
[data-cat="events"] {
  --cat: #f5a524;
  --cat-soft: rgba(245, 165, 36, 0.15);
  --cat-line: rgba(245, 165, 36, 0.45);
}
[data-cat="guides"] {
  --cat: #34d399;
  --cat-soft: rgba(52, 211, 153, 0.14);
  --cat-line: rgba(52, 211, 153, 0.42);
}
[data-cat="reviews"] {
  --cat: #c084fc;
  --cat-soft: rgba(192, 132, 252, 0.15);
  --cat-line: rgba(192, 132, 252, 0.42);
}
[data-cat="stories"] {
  --cat: #fb7185;
  --cat-soft: rgba(251, 113, 133, 0.14);
  --cat-line: rgba(251, 113, 133, 0.42);
}
[data-cat="flight-sim"] {
  --cat: #38bdf8;
  --cat-soft: rgba(56, 189, 248, 0.14);
  --cat-line: rgba(56, 189, 248, 0.42);
}
[data-cat="modelling"] {
  --cat: #f472b6;
  --cat-soft: rgba(244, 114, 182, 0.14);
  --cat-line: rgba(244, 114, 182, 0.42);
}
[data-cat="planespotting"] {
  --cat: #a3e635;
  --cat-soft: rgba(163, 230, 53, 0.14);
  --cat-line: rgba(163, 230, 53, 0.4);
}
[data-cat="virtual-airlines"] {
  --cat: #818cf8;
  --cat-soft: rgba(129, 140, 248, 0.14);
  --cat-line: rgba(129, 140, 248, 0.42);
}
[data-cat="real-aviation"] {
  --cat: #2dd4bf;
  --cat-soft: rgba(45, 212, 191, 0.14);
  --cat-line: rgba(45, 212, 191, 0.42);
}

/* interest-card slugs (used for the expanded placeholder tint) */
[data-cat="flight-simulation"] {
  --cat: #38bdf8;
  --cat-soft: rgba(56, 189, 248, 0.16);
}
[data-cat="aircraft-modelling"] {
  --cat: #f472b6;
  --cat-soft: rgba(244, 114, 182, 0.16);
}
[data-cat="virtual-airlines"] {
  --cat: #818cf8;
  --cat-soft: rgba(129, 140, 248, 0.16);
}
[data-cat="real-world-aviation"] {
  --cat: #2dd4bf;
  --cat-soft: rgba(45, 212, 191, 0.16);
}

.chip {
  display: inline-block;
  padding: 0.22rem 0.65rem;
  border-radius: 9999px;
  background: var(--cat-soft, rgba(94, 141, 207, 0.15));
  border: 1px solid var(--cat-line, rgba(94, 141, 207, 0.3));
  font-size: 0.68rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--cat, var(--color-sky-200));
}

a.chip {
  transition: background-color 0.2s, border-color 0.2s;
}

a.chip:hover {
  background: var(--cat, var(--color-sky-400));
  border-color: var(--cat, var(--color-sky-400));
  color: var(--color-sky-950);
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: rgba(205, 222, 244, 0.55);
}

.post-more {
  display: inline-block;
  margin-top: 1.1rem;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-sky-300);
}

.blog-hero {
  padding: 8.5rem 1.5rem 3rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background:
    radial-gradient(60rem 30rem at 15% -20%, rgba(48, 96, 164, 0.25), transparent 60%),
    rgba(15, 26, 60, 0.35);
}

/* Guides section gets its own signature accent (green) */
.section-guides .blog-hero:not([data-cat]) {
  background:
    radial-gradient(60rem 30rem at 15% -20%, rgba(52, 211, 153, 0.22), transparent 60%),
    rgba(15, 26, 60, 0.35);
  border-bottom-color: rgba(52, 211, 153, 0.35);
}

.section-guides .blog-hero:not([data-cat]) .eyebrow {
  color: #34d399;
}

.blog-hero[data-cat] {
  background:
    radial-gradient(60rem 30rem at 15% -25%, var(--cat-soft), transparent 62%),
    rgba(15, 26, 60, 0.35);
  border-bottom-color: var(--cat-line);
}

.blog-hero[data-cat] h1 {
  color: #fff;
}

.blog-hero[data-cat] .eyebrow {
  color: var(--cat);
}

.blog-hero__inner {
  margin-inline: auto;
  max-width: var(--maxw);
}

.blog-hero h1 {
  margin-top: 0.25rem;
  font-size: clamp(2.25rem, 5vw, 3.25rem);
}

.blog-hero .lead {
  margin-top: 0.75rem;
  max-width: 42rem;
}

.cat-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.75rem;
}

.cat-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.42rem 0.95rem;
  border-radius: 9999px;
  border: 1px solid var(--cat-line, rgba(255, 255, 255, 0.14));
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--cat, rgba(205, 222, 244, 0.75));
  text-transform: capitalize;
  transition: border-color 0.2s, color 0.2s, background-color 0.2s;
}

.cat-pill--all {
  --cat: rgba(205, 222, 244, 0.8);
  --cat-line: rgba(255, 255, 255, 0.16);
}

.cat-pill span {
  font-size: 0.7rem;
  padding: 0.05rem 0.4rem;
  border-radius: 9999px;
  background: var(--cat-soft, rgba(255, 255, 255, 0.08));
}

.cat-pill:hover {
  background: var(--cat-soft, rgba(94, 141, 207, 0.12));
}

.cat-pill.is-active {
  background: var(--cat, var(--color-sky-400));
  border-color: var(--cat, var(--color-sky-400));
  color: var(--color-sky-950);
}

.cat-pill.is-active span {
  background: rgba(9, 19, 45, 0.18);
}

.blog-layout {
  display: grid;
  gap: 3rem;
  margin: 3.5rem auto 5rem;
  max-width: var(--maxw);
  padding-inline: 1.5rem;
  grid-template-columns: 1fr;
}

/* featured card — big, image-led, accent glow */
.feature-card {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  border-radius: 1.5rem;
  overflow: hidden;
  border: 1px solid var(--cat-line, rgba(255, 255, 255, 0.12));
  background:
    linear-gradient(180deg, var(--cat-soft, transparent), transparent 40%),
    rgba(15, 26, 60, 0.5);
  box-shadow: 0 24px 48px -30px rgba(0, 0, 0, 0.6);
  transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
}

.feature-card::before {
  content: '';
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  background: var(--cat, var(--color-sky-400));
  z-index: 2;
}

.feature-card:hover {
  transform: translateY(-0.35rem);
  border-color: var(--cat, rgba(94, 141, 207, 0.5));
  box-shadow: 0 30px 60px -28px var(--cat-soft, rgba(48, 96, 164, 0.5));
}

.feature-card__media {
  position: relative;
  aspect-ratio: 16 / 9;
  background: linear-gradient(135deg, var(--color-sky-800), var(--color-sky-950));
}

.feature-card__media img {
  height: 100%;
  width: 100%;
  object-fit: cover;
}

.feature-card__ph,
.post-card__ph {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(22rem 14rem at 75% 15%, var(--cat-soft, rgba(94, 141, 207, 0.25)), transparent 70%),
    linear-gradient(135deg, var(--color-sky-800), var(--color-sky-950));
}

.feature-card__ghost,
.post-card__ghost {
  font-size: clamp(1.5rem, 5vw, 2.75rem);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--cat, rgba(255, 255, 255, 0.14));
  opacity: 0.28;
}

.feature-card__flag {
  position: absolute;
  top: 1rem;
  left: 1.25rem;
  padding: 0.3rem 0.8rem;
  border-radius: 9999px;
  background: var(--cat, var(--color-sky-400));
  color: var(--color-sky-950);
  font-size: 0.7rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.feature-card__body {
  padding: 2rem;
}

.feature-card__body h2 {
  margin: 0.7rem 0 0;
  font-size: clamp(1.6rem, 3.2vw, 2.15rem);
  line-height: 1.15;
}

.feature-card__excerpt {
  margin: 0.85rem 0 0;
  font-size: 1.02rem;
  color: rgba(205, 222, 244, 0.75);
}

.feature-card .post-more {
  color: var(--cat, var(--color-sky-300));
}

/* post grid — compact, uniform, colour-tabbed */
.post-grid {
  display: grid;
  gap: 1.5rem;
  margin-top: 2rem;
  grid-template-columns: 1fr;
}

.post-card {
  position: relative;
  border-radius: 1rem;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-top: 3px solid var(--cat, rgba(94, 141, 207, 0.5));
  background: rgba(15, 26, 60, 0.4);
  transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
}

.post-card:hover {
  transform: translateY(-0.3rem);
  border-color: rgba(255, 255, 255, 0.1);
  border-top-color: var(--cat, rgba(94, 141, 207, 0.5));
  box-shadow: 0 18px 34px -20px var(--cat-soft, rgba(48, 96, 164, 0.5));
}

.post-card__link {
  display: block;
  height: 100%;
}

.post-card__media {
  position: relative;
  aspect-ratio: 16 / 9;
  background: linear-gradient(135deg, var(--color-sky-800), var(--color-sky-950));
}

.post-card__media img {
  height: 100%;
  width: 100%;
  object-fit: cover;
}

.post-card__tag {
  position: absolute;
  left: 0.9rem;
  bottom: 0.9rem;
  padding: 0.22rem 0.65rem;
  border-radius: 9999px;
  background: var(--cat, var(--color-sky-400));
  color: var(--color-sky-950);
  font-size: 0.66rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.09em;
}

.post-card__body {
  padding: 1.4rem;
}

.post-card__title {
  margin: 0.5rem 0 0;
  font-size: 1.18rem;
  line-height: 1.25;
}

.post-card__excerpt {
  margin: 0.6rem 0 0;
  font-size: 0.9rem;
  color: rgba(205, 222, 244, 0.66);
}

.post-card .post-more {
  color: var(--cat, var(--color-sky-300));
}

.post-meta .dot {
  opacity: 0.5;
}

/* sidebar */
.blog-side {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.side-block {
  border-radius: 1rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(15, 26, 60, 0.4);
  padding: 1.25rem 1.4rem;
}

.side-block h4 {
  margin: 0 0 0.9rem;
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-sky-300);
}

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

.side-list li + li {
  margin-top: 0.15rem;
}

.side-list a {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.5rem 0.15rem;
  font-size: 0.9rem;
  color: rgba(231, 237, 247, 0.8);
  text-transform: capitalize;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  transition: color 0.2s;
}

.side-list a:hover {
  color: #fff;
}

.side-list a.is-active {
  color: var(--cat, var(--color-sky-200));
  font-weight: 700;
}

.side-swatch {
  height: 0.6rem;
  width: 0.6rem;
  flex-shrink: 0;
  border-radius: 3px;
  background: var(--cat, var(--color-sky-400));
}

.side-swatch--all {
  background: linear-gradient(135deg, #5e8dcf, #34d399 45%, #f5a524 75%, #fb7185);
}

.side-count {
  margin-left: auto;
  font-size: 0.75rem;
  color: rgba(205, 222, 244, 0.5);
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  display: inline-block;
  padding: 0.3rem 0.7rem;
  border-radius: 9999px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  font-size: 0.78rem;
  color: rgba(205, 222, 244, 0.75);
  text-transform: lowercase;
  transition: border-color 0.2s, color 0.2s;
}

.tag:hover {
  border-color: rgba(94, 141, 207, 0.5);
  color: #fff;
}

.side-block--cta {
  background: linear-gradient(160deg, rgba(48, 96, 164, 0.25), rgba(9, 19, 45, 0.5));
  border-color: rgba(94, 141, 207, 0.3);
}

.side-block--cta p {
  margin: 0 0 1rem;
  font-size: 0.9rem;
  color: rgba(205, 222, 244, 0.75);
}

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

@media (min-width: 1000px) {
  .blog-layout {
    grid-template-columns: minmax(0, 1fr) 18rem;
  }
  .feature-card {
    grid-template-columns: 1.1fr 1fr;
  }
  .feature-card__media {
    aspect-ratio: auto;
  }
}

/* ---------- single article ---------- */

.article {
  padding-bottom: 6rem;
}

.article__head {
  padding: 8.5rem 1.5rem 2rem;
  background:
    radial-gradient(50rem 26rem at 85% -30%, var(--cat-soft, rgba(48, 96, 164, 0.22)), transparent 60%),
    rgba(15, 26, 60, 0.3);
  border-bottom: 1px solid var(--cat-line, rgba(255, 255, 255, 0.08));
}

.article__rule {
  display: block;
  height: 3px;
  width: 3.5rem;
  margin-top: 1.35rem;
  border-radius: 9999px;
  background: var(--cat, var(--color-sky-400));
}

.article__head-inner {
  margin-inline: auto;
  max-width: 46rem;
}

.article__head h1 {
  margin: 0.75rem 0 0;
  font-size: clamp(2rem, 5vw, 2.9rem);
}

.article__cover {
  margin: -1px auto 0;
  max-width: 60rem;
  padding-inline: 1.5rem;
}

.article__cover img {
  width: 100%;
  border-radius: 1rem;
  margin-top: 2rem;
}

.article__inner {
  margin: 2.5rem auto 0;
  max-width: 46rem;
  padding-inline: 1.5rem;
}

.article__body {
  color: rgba(231, 237, 247, 0.85);
  font-size: 1.06rem;
  line-height: 1.75;
}

.article__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.article__nav {
  display: grid;
  gap: 1rem;
  margin-top: 2rem;
  grid-template-columns: 1fr 1fr;
}

.article__nav-link {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1rem 1.2rem;
  border-radius: 0.9rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(15, 26, 60, 0.4);
  transition: border-color 0.2s, transform 0.2s;
}

.article__nav-link:hover {
  border-color: rgba(94, 141, 207, 0.45);
  transform: translateY(-0.15rem);
}

.article__nav-link span {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: rgba(205, 222, 244, 0.5);
}

.article__nav-link strong {
  color: #fff;
  font-size: 0.95rem;
}

.article__nav-link--next {
  text-align: right;
}

.article__body h2 {
  margin: 2.5rem 0 1rem;
  font-size: 1.5rem;
}

.article__body h3 {
  margin: 2rem 0 0.75rem;
  font-size: 1.2rem;
}

.article__body p {
  margin: 0 0 1.25rem;
}

.article__body a {
  color: var(--color-sky-300);
  text-decoration: underline;
}

.article__body ul,
.article__body ol {
  margin: 0 0 1.25rem;
  padding-left: 1.5rem;
}

.article__body li {
  margin-bottom: 0.5rem;
}

.article__body img {
  border-radius: 0.75rem;
  margin: 1.5rem 0;
}

.article__body blockquote {
  margin: 1.5rem 0;
  padding-left: 1rem;
  border-left: 3px solid var(--color-sky-500);
  color: rgba(205, 222, 244, 0.75);
}

.article__body code {
  background: rgba(0, 0, 0, 0.35);
  padding: 0.15em 0.4em;
  border-radius: 0.35rem;
  font-size: 0.9em;
}

.article__body pre {
  background: rgba(0, 0, 0, 0.35);
  padding: 1rem;
  border-radius: 0.75rem;
  overflow-x: auto;
}

.article__back {
  display: inline-block;
  margin-top: 3rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-sky-300);
}

.pagination {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  margin: 3rem auto 0;
  list-style: none;
  padding: 0;
}

.pagination a,
.pagination span {
  display: inline-block;
  padding: 0.4rem 0.8rem;
  border-radius: 0.5rem;
  border: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 0.875rem;
  color: rgba(205, 222, 244, 0.7);
}

.pagination .active span {
  background: rgba(94, 141, 207, 0.15);
  color: var(--color-sky-200);
}