/* =========================================================
   Aviator Guides — Design System
   Theme: vintage flight-instrument panel — petrol teal,
   brass/gold, parchment, rust-orange. Dashed flight-path
   rules instead of plain hairlines. Altitude-curve motif.
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=Source+Serif+4:ital,opsz,wght@0,8..60,400;0,8..60,500;0,8..60,600;1,8..60,400&display=swap');

:root{
  --petrol-900:#0B2426;
  --petrol-800:#0F3234;
  --petrol-700:#154347;
  --panel:#123437;
  --parchment:#F3EAD8;
  --parchment-dim:#E7DBC3;
  --ink:#20180F;
  --brass:#C9A227;
  --brass-bright:#E8C25B;
  --rust:#C1502E;
  --rust-bright:#E06B44;
  --line-dark: rgba(243,234,216,0.16);
  --line-light: rgba(32,24,15,0.14);
  --font-head:'Space Grotesk', 'Segoe UI', sans-serif;
  --font-body:'Source Serif 4', Georgia, serif;
  --radius: 3px;
  --max: 1120px;
}
.brand-logo {
  height: 44px;
  width: auto;
  display: block;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--parchment);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;}
.container{max-width:var(--max);margin:0 auto;padding:0 24px;}

h1,h2,h3,h4{
  font-family:var(--font-head);
  font-weight:600;
  line-height:1.15;
  margin:0 0 .5em;
  color:var(--petrol-900);
}
h1{font-size:clamp(2.1rem,4.4vw,3.4rem); font-weight:700; letter-spacing:-.01em;}
h2{font-size:clamp(1.5rem,2.6vw,2.1rem);}
h3{font-size:1.2rem;}
p{max-width:66ch;}
.lede{font-size:1.15rem;color:#3a2f1e;}

/* dashed flight-path divider */
.divider{
  border:none;
  height:0;
  border-top:2px dashed var(--line-light);
  margin:0;
}
.divider--dark{border-top-color:var(--line-dark);}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:.5em;
  font-family:var(--font-head);font-weight:600;font-size:.95rem;
  padding:.85em 1.5em;border-radius:var(--radius);
  border:1px solid transparent;cursor:pointer;text-decoration:none;
  transition:transform .15s ease, box-shadow .15s ease;
}
.btn:hover{transform:translateY(-1px);}
.btn-primary{background:var(--rust);color:var(--parchment);box-shadow:0 3px 0 #8f3a1f;}
.btn-primary:hover{background:var(--rust-bright);}
.btn-ghost{background:transparent;border-color:var(--petrol-900);color:var(--petrol-900);}
.btn-ghost:hover{background:var(--petrol-900);color:var(--parchment);}
.btn-ghost.on-dark{border-color:var(--parchment-dim);color:var(--parchment);}
.btn-ghost.on-dark:hover{background:var(--parchment);color:var(--petrol-900);}
.btn-block{width:100%;justify-content:center;}

/* ---------- Nav ---------- */
.nav{
  position:sticky;top:0;z-index:50;
  background:var(--petrol-900);
  border-bottom:2px dashed rgba(243,234,216,0.22);
}
.nav.is-scrolled{box-shadow:0 6px 18px rgba(0,0,0,.25);}
.nav-inner{
  max-width:var(--max);margin:0 auto;padding:14px 24px;
  display:flex;align-items:center;justify-content:space-between;
}
.brand{
  font-family:var(--font-head);font-weight:700;font-size:1.25rem;
  color:var(--parchment);text-decoration:none;letter-spacing:-.01em;
  display:flex;align-items:center;gap:.5em;
}
.brand .dot{color:var(--brass-bright);}
.nav-links{
  display:flex;align-items:center;gap:28px;list-style:none;margin:0;padding:0;
}
.nav-links a{
  color:var(--parchment-dim);text-decoration:none;font-size:.95rem;
  font-family:var(--font-head);font-weight:500;
  padding:6px 0;border-bottom:2px solid transparent;
}
.nav-links a:hover,.nav-links a.active{color:var(--parchment);border-color:var(--brass);}
.nav-cta{display:flex;align-items:center;gap:16px;}
.nav-toggle{
  display:none;background:none;border:1px solid var(--line-dark);border-radius:var(--radius);
  color:var(--parchment);padding:8px 10px;font-size:1.1rem;cursor:pointer;
}
@media (max-width:860px){
  .nav-links{
    position:absolute;top:100%;left:0;right:0;background:var(--petrol-900);
    flex-direction:column;align-items:flex-start;gap:0;
    max-height:0;overflow:hidden;transition:max-height .25s ease;
    border-bottom:2px dashed rgba(243,234,216,0.22);
  }
  .nav-links.open{max-height:420px;}
  .nav-links li{width:100%;}
  .nav-links a{display:block;width:100%;padding:14px 24px;border-bottom:1px solid var(--line-dark);}
  .nav-toggle{display:inline-block;}
  .nav-cta .btn-primary{display:none;}
}

/* ---------- Hero ---------- */
.hero{
  background:radial-gradient(120% 140% at 85% -10%, #1a4b4f 0%, var(--petrol-800) 45%, var(--petrol-900) 100%);
  color:var(--parchment);
  padding:72px 0 88px;
  position:relative;
  overflow:hidden;
}
.hero-grid{
  display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center;
}
.eyebrow{
  font-family:var(--font-head);font-size:.82rem;color:var(--brass-bright);
  letter-spacing:.04em;margin-bottom:14px;display:flex;align-items:center;gap:10px;
}
.eyebrow::before{content:"";width:22px;height:2px;background:var(--brass-bright);display:inline-block;}
.hero h1{color:var(--parchment);}
.hero p{color:var(--parchment-dim);}
.hero-actions{display:flex;gap:14px;margin-top:28px;flex-wrap:wrap;}
.hero-note{margin-top:18px;font-size:.85rem;color:#9db3ab;font-family:var(--font-head);}
@media (max-width:860px){.hero-grid{grid-template-columns:1fr;}}

/* altitude curve svg */
.curve-wrap{position:relative;}
.curve-wrap svg{width:100%;height:auto;}
.curve-path{
  stroke:var(--brass-bright);stroke-width:3;fill:none;stroke-linecap:round;
  stroke-dasharray:600;stroke-dashoffset:600;
  animation:draw 3.2s ease-in-out infinite;
}
.curve-plane{
  transform-origin:center;
  offset-path: path("M10,230 C120,230 150,120 230,90 C300,64 330,40 358,18");
  animation:fly 3.2s ease-in-out infinite;
}
@keyframes draw{
  0%{stroke-dashoffset:600;}
  60%{stroke-dashoffset:0;}
  85%{stroke-dashoffset:0;opacity:1;}
  92%{opacity:0;}
  100%{stroke-dashoffset:600;opacity:0;}
}
@keyframes fly{
  0%{offset-distance:0%; opacity:0;}
  6%{opacity:1;}
  60%{offset-distance:100%;opacity:1;}
  85%{offset-distance:100%;opacity:1;}
  92%{opacity:0;}
  100%{offset-distance:0%;opacity:0;}
}
.curve-mult{
  font-family:var(--font-head);font-weight:700;font-size:2.6rem;color:var(--brass-bright);
  position:absolute;top:14px;right:6%;
}
@media (prefers-reduced-motion:reduce){
  .curve-path,.curve-plane{animation:none;stroke-dashoffset:0;offset-distance:100%;opacity:1;}
}

/* ---------- Sections ---------- */
.section{padding:64px 0;}
.section-alt{background:var(--parchment-dim);}
.section-dark{background:var(--petrol-900);color:var(--parchment);}
.section-dark h2, .section-dark h3{color:var(--parchment);}
.section-dark p{color:var(--parchment-dim);}
.section-head{max-width:640px;margin-bottom:36px;}
.tag{
  display:inline-block;font-family:var(--font-head);font-size:.78rem;color:var(--rust);
  border:1px solid var(--rust);padding:3px 10px;border-radius:20px;margin-bottom:10px;
}

/* feature grid */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:26px;}
@media (max-width:860px){.grid-3{grid-template-columns:1fr;} .grid-2{grid-template-columns:1fr;}}

.card{
  background:#fff;border:1px solid var(--line-light);border-radius:var(--radius);
  padding:26px;
}
.card--panel{background:var(--panel);color:var(--parchment);border-color:var(--line-dark);}
.card-icon{
  width:42px;height:42px;border-radius:50%;
  border:2px dashed var(--brass);display:flex;align-items:center;justify-content:center;
  margin-bottom:16px;font-family:var(--font-head);font-weight:700;color:var(--brass);
}

/* stat strip */
.stat-strip{display:flex;flex-wrap:wrap;gap:0;border:1px dashed var(--line-dark);border-radius:var(--radius);overflow:hidden;}
.stat{flex:1 1 160px;padding:22px 20px;border-right:1px dashed var(--line-dark);}
.stat:last-child{border-right:none;}
.stat b{display:block;font-family:var(--font-head);font-size:1.7rem;color:var(--brass-bright);}
.stat span{font-size:.85rem;color:var(--parchment-dim);}

/* ---------- Steps (numbered — genuinely sequential) ---------- */
.steps{list-style:none;margin:0;padding:0;counter-reset:step;}
.step{
  display:grid;grid-template-columns:64px 1fr;gap:20px;padding:22px 0;
  border-bottom:1px dashed var(--line-light);
}
.step:last-child{border-bottom:none;}
.step-num{
  counter-increment:step;font-family:var(--font-head);font-weight:700;font-size:1.4rem;
  color:var(--rust);
}
.step-num::before{content: counter(step, decimal-leading-zero);}

/* ---------- Timeline (history) ---------- */
.timeline{position:relative;padding-left:34px;border-left:2px dashed var(--petrol-700);}
.tl-item{position:relative;padding-bottom:36px;}
.tl-item:last-child{padding-bottom:0;}
.tl-item::before{
  content:"";position:absolute;left:-42px;top:4px;width:14px;height:14px;
  background:var(--rust);border-radius:50%;border:3px solid var(--parchment);
  box-shadow:0 0 0 2px var(--petrol-700);
}
.tl-year{font-family:var(--font-head);font-weight:700;color:var(--rust);font-size:1.05rem;margin-bottom:4px;}

/* ---------- Blog ---------- */
.blog-list{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;}
@media (max-width:860px){.blog-list{grid-template-columns:1fr;}}
.blog-card{
  border:1px solid var(--line-light);border-radius:var(--radius);padding:24px;
  background:#fff;text-decoration:none;color:var(--ink);display:flex;flex-direction:column;gap:10px;
  transition:border-color .15s ease;
}
.blog-card:hover{border-color:var(--rust);}
.blog-meta{font-family:var(--font-head);font-size:.78rem;color:var(--petrol-700);display:flex;gap:10px;}
.blog-card h3{margin:0;color:var(--petrol-900);}
.blog-card p{margin:0;font-size:.95rem;color:#4a4030;}
.read-more{font-family:var(--font-head);font-weight:600;font-size:.85rem;color:var(--rust);margin-top:auto;}

article.post{max-width:70ch;margin:0 auto;}
article.post h2{margin-top:1.6em;}
article.post p{max-width:none;}
.post-hero{padding:52px 0 34px;}
.post-meta{font-family:var(--font-head);font-size:.85rem;color:var(--parchment-dim);}
.callout{
  border-left:3px solid var(--brass);background:var(--parchment-dim);
  padding:16px 20px;margin:24px 0;border-radius:0 var(--radius) var(--radius) 0;
}

/* ---------- FAQ ---------- */
.faq details{border-bottom:1px dashed var(--line-light);padding:16px 0;}
.faq summary{
  cursor:pointer;list-style:none;font-family:var(--font-head);font-weight:600;
  display:flex;justify-content:space-between;align-items:center;color:var(--petrol-900);
}
.faq summary::-webkit-details-marker{display:none;}
.faq summary::after{content:"+";font-size:1.3rem;color:var(--rust);}
.faq details[open] summary::after{content:"–";}
.faq p{margin:12px 0 0;color:#4a4030;}

/* ---------- Demo widget ---------- */
.demo{
  border:1px dashed var(--brass);border-radius:var(--radius);
  background:linear-gradient(180deg,var(--petrol-800),var(--petrol-900));
  color:var(--parchment);padding:32px;text-align:center;
}
.demo-readout{
  font-family:var(--font-head);font-weight:700;font-size:3.4rem;color:var(--brass-bright);
  margin:8px 0 18px;
}
.demo-status{min-height:1.4em;font-family:var(--font-head);font-size:.95rem;margin-bottom:18px;}
.demo-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;}
.demo small{display:block;margin-top:16px;color:#9db3ab;}

/* ---------- Table ---------- */
table.facts{width:100%;border-collapse:collapse;margin:20px 0;}
table.facts td,table.facts th{padding:10px 14px;border-bottom:1px solid var(--line-light);text-align:left;font-size:.95rem;}
table.facts th{font-family:var(--font-head);color:var(--petrol-900);width:38%;}

/* ---------- Footer ---------- */
.footer{background:var(--petrol-900);color:var(--parchment-dim);padding:56px 0 28px;}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px;}
.footer h4{color:var(--parchment);font-size:.9rem;margin-bottom:14px;}
.footer ul{list-style:none;margin:0;padding:0;}
.footer li{margin-bottom:8px;}
.footer a{color:var(--parchment-dim);text-decoration:none;font-size:.92rem;}
.footer a:hover{color:var(--brass-bright);}
.footer-bottom{
  margin-top:40px;padding-top:22px;border-top:2px dashed var(--line-dark);
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:.82rem;
}
.footer-disclaimer{font-size:.82rem;color:#8ba39a;max-width:70ch;margin-top:18px;}
@media (max-width:760px){.footer-grid{grid-template-columns:1fr 1fr;}}

.badge-18{
  display:inline-flex;align-items:center;justify-content:center;
  width:28px;height:28px;border:1px solid var(--parchment-dim);border-radius:50%;
  font-family:var(--font-head);font-size:.75rem;font-weight:700;
}
.post-meta {
  margin-top: 10px;
  opacity: 0.8;
}