/* ==========================================================================
   Rural Air Mobility News — Ghost theme
   Editorial serif + clean sans; restrained aviation-green accent.
   ========================================================================== */

:root {
  --font-serif: 'Fraunces', Georgia, 'Times New Roman', serif;
  --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;

  --color-bg: #fbfaf7;
  --color-surface: #ffffff;
  --color-ink: #14181a;
  --color-ink-soft: #4a5359;
  --color-ink-mute: #7c8791;
  --color-line: #e6e2da;
  --color-accent: #1a6b4f;
  --color-accent-ink: #0f4d38;
  --color-accent-bg: #e8f1ec;

  --radius: 4px;
  --radius-lg: 8px;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;
  --space-24: 96px;

  --container: 1200px;
  --container-narrow: 720px;

  --shadow-sm: 0 1px 2px rgba(20, 24, 26, 0.04);
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  color: var(--color-ink);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

h1, h2, h3, h4, h5 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 0 0 var(--space-4);
  color: var(--color-ink);
}

.container { max-width: var(--container); margin: 0 auto; padding: 0 var(--space-6); }
.container-narrow { max-width: var(--container-narrow); margin: 0 auto; padding: 0 var(--space-6); }

.eyebrow {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent-ink);
  margin: 0 0 var(--space-4);
}

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

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(251, 250, 247, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-line);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  padding-top: var(--space-4);
  padding-bottom: var(--space-4);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-ink);
  text-decoration: none;
  flex-shrink: 0;
}
.brand:hover { text-decoration: none; }
.brand svg { color: var(--color-accent); }
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-name { font-family: var(--font-serif); font-weight: 600; font-size: 18px; letter-spacing: -0.01em; }
.brand-tag { font-size: 11px; color: var(--color-ink-mute); }

.primary-nav {
  display: flex;
  gap: var(--space-6);
  margin-left: auto;
  flex-wrap: wrap;
}
.primary-nav a {
  color: var(--color-ink-soft);
  font-size: 14px;
  font-weight: 500;
}
.primary-nav a:hover { color: var(--color-accent-ink); text-decoration: none; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  font-family: var(--font-sans);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
  text-decoration: none;
}
.btn-primary { background: var(--color-accent); color: white; }
.btn-primary:hover { background: var(--color-accent-ink); text-decoration: none; }
.btn-ghost { background: transparent; color: var(--color-ink); border-color: var(--color-line); }
.btn-ghost:hover { border-color: var(--color-ink); text-decoration: none; }

/* ---------- Hero ---------- */

.hero {
  padding: clamp(48px, 8vw, 120px) 0 clamp(48px, 6vw, 80px);
  border-bottom: 1px solid var(--color-line);
}
.hero-inner { max-width: 900px; }
.hero h1 {
  font-size: clamp(36px, 5.4vw, 64px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-6);
}
.hero-lede {
  font-size: clamp(17px, 1.6vw, 20px);
  line-height: 1.5;
  color: var(--color-ink-soft);
  max-width: 640px;
  margin: 0 0 var(--space-8);
}
.hero-actions { display: flex; gap: var(--space-3); flex-wrap: wrap; }

/* ---------- Featured lead card ---------- */

.featured-lead {
  padding: clamp(32px, 5vw, 64px) 0;
  border-bottom: 1px solid var(--color-line);
}
.lead-card {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--space-10);
  align-items: center;
}
.lead-image {
  display: block;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--color-line);
}
.lead-image img { width: 100%; height: 100%; object-fit: cover; }
.lead-body h2 {
  font-size: clamp(28px, 3.5vw, 40px);
  margin-bottom: var(--space-4);
}
.lead-body h2 a { color: inherit; }
.lead-body p { color: var(--color-ink-soft); font-size: 17px; line-height: 1.55; }

/* ---------- Section header (category pages) ---------- */

.section-header {
  padding: clamp(48px, 6vw, 80px) 0 clamp(24px, 3vw, 32px);
  border-bottom: 1px solid var(--color-line);
}
.section-header h1 {
  font-size: clamp(32px, 4.5vw, 52px);
  margin-bottom: var(--space-3);
}
.section-desc { color: var(--color-ink-soft); font-size: 17px; max-width: 640px; }

/* ---------- Post grid ---------- */

.post-grid-section {
  padding: clamp(48px, 6vw, 80px) 0;
}
.grid-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: var(--space-8);
  flex-wrap: wrap;
  gap: var(--space-4);
}
.section-title {
  font-size: clamp(22px, 2.4vw, 28px);
  margin: 0 0 var(--space-8);
}
.text-link {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent-ink);
}
.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-8) var(--space-6);
}

.post-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.post-card-image {
  display: block;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--color-line);
}
.post-card-image img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.4s ease;
}
.post-card:hover .post-card-image img { transform: scale(1.03); }
.post-card-body { display: flex; flex-direction: column; gap: var(--space-2); }
.post-card h3 {
  font-size: 20px;
  line-height: 1.25;
  margin: var(--space-1) 0 var(--space-2);
}
.post-card h3 a { color: inherit; }
.post-card h3 a:hover { color: var(--color-accent-ink); text-decoration: none; }
.post-card p { margin: 0; color: var(--color-ink-soft); font-size: 14.5px; line-height: 1.5; }

.tag-pill {
  display: inline-block;
  align-self: flex-start;
  background: var(--color-accent-bg);
  color: var(--color-accent-ink);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 4px 10px;
  border-radius: 999px;
  text-decoration: none;
}
.tag-pill:hover { background: var(--color-accent); color: white; text-decoration: none; }
.tag-pill-sm { font-size: 10.5px; padding: 3px 8px; margin-right: 4px; }

.post-meta {
  display: flex;
  gap: var(--space-2);
  align-items: center;
  font-size: 12.5px;
  color: var(--color-ink-mute);
}

/* ---------- Sections band ---------- */

.sections-band {
  background: var(--color-surface);
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
  padding: clamp(48px, 6vw, 80px) 0;
}
.sections-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-4);
}
.section-card {
  display: block;
  padding: var(--space-6);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-bg);
  color: inherit;
  text-decoration: none;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.section-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
  text-decoration: none;
}
.section-card h3 { font-size: 20px; margin-bottom: var(--space-2); }
.section-card p { margin: 0; color: var(--color-ink-soft); font-size: 14.5px; }

/* ---------- Post ---------- */

.post-full { padding: clamp(32px, 5vw, 64px) 0 clamp(48px, 6vw, 96px); }
.post-full-header { text-align: left; margin-bottom: var(--space-10); }
.post-full-header h1 {
  font-size: clamp(32px, 4.5vw, 52px);
  line-height: 1.1;
  margin: var(--space-4) 0 var(--space-4);
}
.post-lede {
  font-size: clamp(18px, 1.6vw, 21px);
  line-height: 1.5;
  color: var(--color-ink-soft);
  font-family: var(--font-serif);
  font-weight: 400;
}
.post-full-image {
  margin: 0 0 var(--space-10);
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding: 0 var(--space-6);
}
.post-full-image img { width: 100%; border-radius: var(--radius-lg); }
.post-full-image figcaption {
  font-size: 13px;
  color: var(--color-ink-mute);
  margin-top: var(--space-2);
  text-align: center;
}

.post-full-content {
  font-size: 18px;
  line-height: 1.7;
  color: var(--color-ink);
}
.post-full-content > * { margin-bottom: var(--space-6); }
.post-full-content h2 {
  font-size: 28px;
  margin-top: var(--space-12);
  margin-bottom: var(--space-4);
}
.post-full-content h3 { font-size: 22px; margin-top: var(--space-10); }
.post-full-content p a { border-bottom: 1px solid var(--color-accent); }
.post-full-content blockquote {
  border-left: 3px solid var(--color-accent);
  padding-left: var(--space-6);
  margin-left: 0;
  font-family: var(--font-serif);
  font-size: 22px;
  line-height: 1.4;
  color: var(--color-ink);
  font-style: italic;
}
.post-full-content ul, .post-full-content ol { padding-left: 1.5em; }
.post-full-content li { margin-bottom: var(--space-2); }
.post-full-content img { border-radius: var(--radius); margin: var(--space-8) 0; }
.post-full-content code {
  background: var(--color-accent-bg);
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 0.9em;
}

.post-tags { margin-top: var(--space-10); }

.related { padding: clamp(48px, 6vw, 80px) 0; border-top: 1px solid var(--color-line); background: var(--color-surface); }

/* ---------- Subscribe band ---------- */

.subscribe-band {
  background: var(--color-ink);
  color: var(--color-bg);
  padding: clamp(48px, 6vw, 80px) 0;
}
.subscribe-inner {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--space-10);
  align-items: center;
}
.subscribe-band h2 {
  color: white;
  font-size: clamp(24px, 3vw, 32px);
  margin-bottom: var(--space-3);
}
.subscribe-band p { color: rgba(255,255,255,0.75); margin: 0; }
.subscribe-form {
  display: flex;
  gap: var(--space-2);
  background: white;
  padding: 6px;
  border-radius: var(--radius-lg);
}
.subscribe-form input {
  flex: 1;
  border: 0;
  background: transparent;
  padding: 12px 14px;
  font: inherit;
  font-size: 15px;
  color: var(--color-ink);
  outline: none;
}
.subscribe-form button {
  background: var(--color-accent);
  color: white;
  border: 0;
  padding: 12px 20px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
}
.subscribe-form button:hover { background: var(--color-accent-ink); }

/* ---------- Footer ---------- */

.site-footer {
  background: var(--color-bg);
  border-top: 1px solid var(--color-line);
  padding: clamp(48px, 6vw, 80px) 0 var(--space-8);
}
.footer-inner {
  display: grid;
  grid-template-columns: 1.4fr 2fr;
  gap: var(--space-12);
  margin-bottom: var(--space-12);
}
.footer-brand p { color: var(--color-ink-soft); margin-top: var(--space-3); font-size: 14px; }
.footer-cols { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-8); }
.footer-cols h4 {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-ink-mute);
  margin-bottom: var(--space-4);
}
.footer-cols a {
  display: block;
  color: var(--color-ink-soft);
  font-size: 14px;
  padding: 4px 0;
}
.footer-cols a:hover { color: var(--color-accent-ink); text-decoration: none; }
.footer-bottom {
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-line);
  font-size: 12.5px;
  color: var(--color-ink-mute);
}

/* ---------- Responsive ---------- */

@media (max-width: 900px) {
  .header-inner { flex-wrap: wrap; gap: var(--space-4); }
  .primary-nav { order: 3; width: 100%; gap: var(--space-4); font-size: 13.5px; }
  .brand-tag { display: none; }
  .lead-card { grid-template-columns: 1fr; gap: var(--space-6); }
  .subscribe-inner { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: var(--space-8); }
}

@media (max-width: 560px) {
  .subscribe-form { flex-direction: column; padding: var(--space-3); }
  .subscribe-form button { width: 100%; padding: 14px; }
  .footer-cols { grid-template-columns: 1fr; gap: var(--space-6); }
}

/* Accessibility: keyboard-only "Skip to content" link.
   Visually hidden until it receives focus. */
.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-2, 8px);
  background: var(--color-accent);
  color: #fff;
  padding: 12px 16px;
  border-radius: var(--radius);
  font-weight: 600;
  text-decoration: none;
  z-index: 1000;
  transition: top 0.15s ease-in-out;
}
.skip-link:focus,
.skip-link:focus-visible {
  top: var(--space-2, 8px);
  outline: 3px solid var(--color-accent-ink);
  outline-offset: 2px;
}

/* Global reduced-motion: disable non-essential animations/transitions
   for users who set prefers-reduced-motion: reduce at the OS level. */
@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;
  }
}