/* ==========================================================================
   Rapid Drone Parts — Design System
   Visual language adapted from the Tronix3D brand system: production-black /
   engineering-navy / signal-orange, Oxanium display type, JetBrains Mono
   metadata, Inter body copy. Square corners, crisp borders, engineered grids.
   ========================================================================== */

:root {
  --ink: #0F0E11;
  --navy: #102B51;
  --orange: #F18E22;
  --orange-dark: #C96E10;
  --paper: #FFFFFF;
  --mist: #F4F6F8;
  --line: #DDE2E6;
  --gray: #7F8994;
  --white-70: rgba(255,255,255,.70);
  --white-55: rgba(255,255,255,.55);
  --mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  --sans: Inter, Arial, Helvetica, sans-serif;
  --head: "Oxanium", "Arial Narrow", Impact, sans-serif;
  --maxw: 1320px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--navy);
  font-family: var(--sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img, svg { max-width: 100%; display: block; }
a { color: inherit; }
.skip-link {
  position: absolute; left: -999px; top: 0; z-index: 100;
  background: var(--orange); color: var(--ink); padding: 12px 18px;
  font: 700 12px var(--sans); text-decoration: none;
}
.skip-link:focus { left: 12px; top: 12px; }

/* ---------- layout shells ---------- */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 clamp(20px,5vw,64px); }
main { display: block; }
section { padding: 64px 0; border-bottom: 1px solid var(--line); }
section.tight { padding: 44px 0; }
section:last-of-type { border-bottom: none; }
.section-head { max-width: 800px; margin-bottom: 34px; }
.section-head p { max-width: 680px; color: #566575; font-size: 17px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }

/* ---------- type ---------- */
h1, h2, h3, h4 { font-family: var(--head); text-transform: uppercase; letter-spacing: -.045em; margin: 0; line-height: .97; color: var(--navy); }
h1 { font-size: clamp(40px,7vw,84px); max-width: 900px; }
h2 { font-size: clamp(30px,4.4vw,52px); margin-top: 10px; }
h3 { font-size: 22px; }
h4 { font-size: 17px; }
h1 span, h2 span, h3 span, .accent { color: var(--orange); }
p { margin: 0 0 16px; }
.body-copy { color: #455669; font-size: 16px; }
.lede { max-width: 660px; color: #455669; font-size: 19px; }
.kicker, .label, .mini-label { color: var(--orange); font: 700 11px/1.2 var(--mono); text-transform: uppercase; letter-spacing: .22em; }
.rule { display: inline-block; width: 38px; height: 1px; background: currentColor; margin: 0 12px 4px 0; }
.statement { font-family: var(--head); font-size: clamp(20px,2.6vw,27px); text-transform: uppercase; letter-spacing: -.03em; line-height: 1.12; color: var(--navy); }
code, .code { color: var(--orange-dark); font: 12px var(--mono); }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ---------- header / nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--ink); border-bottom: 1px solid rgba(255,255,255,.10);
}
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 76px; }
.wordmark { font: 800 22px/.9 var(--head); letter-spacing: -.05em; text-transform: uppercase; color: white; text-decoration: none; display: flex; gap: 8px; align-items: baseline; white-space: nowrap; }
.wordmark .orange { color: var(--orange); }
.wordmark small { font: 700 9px var(--mono); letter-spacing: .18em; color: var(--white-55); text-transform: uppercase; }
.nav-toggle {
  display: none; background: transparent; border: 2px solid var(--white-55); color: white;
  width: 44px; height: 44px; align-items: center; justify-content: center; cursor: pointer;
}
.primary-nav { display: flex; align-items: center; gap: 28px; }
.primary-nav ul { list-style: none; display: flex; gap: 26px; margin: 0; padding: 0; }
.primary-nav a { color: var(--white-70); text-decoration: none; font: 700 13px var(--sans); letter-spacing: .01em; padding: 6px 2px; border-bottom: 2px solid transparent; }
.primary-nav a:hover, .primary-nav a[aria-current="page"] { color: white; border-bottom-color: var(--orange); }
.primary-nav .btn { margin-left: 4px; }
.primary-nav a.btn, .primary-nav a.btn:hover, .primary-nav a.btn[aria-current="page"] { color: var(--ink); border-bottom: none; }

@media (max-width: 880px) {
  .nav-toggle { display: flex; }
  .primary-nav {
    position: fixed; inset: 76px 0 0 0; background: var(--ink); flex-direction: column;
    align-items: stretch; padding: 20px clamp(20px,5vw,64px) 32px; gap: 18px; overflow-y: auto;
    transform: translateY(-8px); opacity: 0; pointer-events: none; transition: opacity .18s ease, transform .18s ease;
  }
  .primary-nav.is-open { opacity: 1; pointer-events: auto; transform: translateY(0); }
  .primary-nav ul { flex-direction: column; gap: 4px; }
  .primary-nav a { display: block; padding: 14px 4px; font-size: 16px; border-bottom: 1px solid rgba(255,255,255,.08); }
  .primary-nav .btn { margin: 10px 0 0; text-align: center; }
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 44px; padding: 12px 20px; text-decoration: none; cursor: pointer;
  font: 800 11px var(--sans); letter-spacing: .11em; text-transform: uppercase;
  border: 2px solid transparent; background: var(--orange); color: var(--ink);
  transition: background .18s ease, color .18s ease, border-color .18s ease;
}
.btn:hover { background: var(--orange-dark); }
.btn.outline { background: transparent; color: var(--orange); border-color: var(--orange); }
.btn.outline:hover { background: var(--orange); color: var(--ink); }
.btn.on-light { color: var(--navy); border-color: var(--navy); background: transparent; }
.btn.on-light:hover { background: var(--navy); color: white; }
.btn.block { width: 100%; }

/* ---------- hero ---------- */
.hero {
  padding: 70px 0 76px; color: white; background: var(--ink); position: relative; overflow: hidden;
}
.hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image: linear-gradient(rgba(255,255,255,.07) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.07) 1px, transparent 1px);
  background-size: 46px 46px;
}
.hero::after {
  content: ""; position: absolute; width: 56vw; height: 56vw; min-width: 520px; min-height: 520px;
  border: 1px solid rgba(255,255,255,.09); border-radius: 50%; right: -22vw; top: -18vw; opacity: .6;
}
.hero .wrap { position: relative; z-index: 1; }
.hero-inner { max-width: 900px; }
.hero h1 { color: white; margin: 16px 0 0; }
.hero p.lede { color: var(--white-70); font-size: 19px; margin: 24px 0 34px; }
.hero-ctas { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 34px; }
.rail { display: flex; flex-wrap: wrap; gap: 12px 22px; color: var(--white-55); font: 10px/1.3 var(--mono); letter-spacing: .14em; text-transform: uppercase; }
.rail b { color: var(--orange); }
.page-hero {
  background: var(--ink); color: white; padding: 56px 0 52px; position: relative; overflow: hidden;
}
.page-hero::before { content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image: linear-gradient(rgba(255,255,255,.07) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.07) 1px, transparent 1px);
  background-size: 46px 46px; }
.page-hero .wrap { position: relative; z-index: 1; }
.page-hero h1 { color: white; margin-top: 14px; max-width: 820px; }
.page-hero p.lede { color: var(--white-70); margin-top: 20px; margin-bottom: 0; }
.breadcrumbs { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; margin: 0 0 18px; padding: 0; font: 11px var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--white-55); }
.breadcrumbs a { color: var(--white-70); text-decoration: none; }
.breadcrumbs a:hover { color: var(--orange); }
.breadcrumbs li:not(:last-child)::after { content: "/"; margin-left: 6px; color: rgba(255,255,255,.35); }

/* ---------- grids / cards ---------- */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 26px 60px; }
.principles { display: grid; grid-template-columns: repeat(3,1fr); border: 1px solid var(--line); }
.principle { padding: 26px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.principle:nth-child(3n) { border-right: none; }
.num { color: var(--orange); font: 700 11px var(--mono); letter-spacing: .16em; }
.principle h3 { font-size: 22px; margin: 12px 0 10px; }
.principle p { margin: 0; color: #596878; font-size: 14px; }

.card-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 16px; }
.card-grid.cols-2 { grid-template-columns: repeat(2,1fr); }
.card-grid.cols-4 { grid-template-columns: repeat(4,1fr); }
.card-grid.cols-5 { grid-template-columns: repeat(5,1fr); }
.card-grid.cols-6 { grid-template-columns: repeat(6,1fr); }
.ui-card { border: 1px solid var(--line); padding: 24px; display: flex; flex-direction: column; gap: 6px; }
.ui-card.dark { background: var(--ink); color: white; border: none; }
.ui-card.dark h3, .ui-card.dark h4 { color: white; }
.ui-card.dark p { color: var(--white-70); }
.ui-card.accent { background: var(--orange); border: none; color: var(--ink); }
.ui-card.accent h3, .ui-card.accent h4 { color: var(--ink); }
.ui-card h3 { font-size: 22px; margin: 12px 0 6px; }
.ui-card p { font-size: 14px; color: #647281; margin: 0; }
.ui-card .mini-label.on-dark { color: var(--orange); }
.ui-card a.card-link { margin-top: 12px; font: 800 11px var(--sans); letter-spacing: .09em; text-transform: uppercase; color: var(--navy); text-decoration: none; }
.ui-card a.card-link:hover { color: var(--orange-dark); text-decoration: underline; }
.icon-box { width: 46px; height: 46px; display: grid; place-items: center; border: 2px solid currentColor; color: var(--navy); font: 22px var(--mono); }
.dark .icon-box { color: var(--orange); }
.accent .icon-box { color: var(--ink); }

/* ---------- photo grid ---------- */
.photo-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 16px; }
.photo-grid.cols-2 { grid-template-columns: repeat(2,1fr); }
.photo-card { border: 1px solid var(--line); display: flex; flex-direction: column; background: white; }
.photo-card .photo-frame { aspect-ratio: 4 / 3; overflow: hidden; background: var(--mist); }
.photo-card .photo-frame img { display: block; width: 100%; height: 100%; object-fit: cover; }
.photo-card .cap { padding: 14px 16px; }
.photo-card .cap .mini-label { display: block; margin-bottom: 6px; }
.photo-card .cap p { margin: 0; font-size: 13.5px; color: #647281; }
.photo-banner { border: 1px solid var(--line); overflow: hidden; aspect-ratio: 16 / 7; }
.photo-banner img { display: block; width: 100%; height: 100%; object-fit: cover; }
.photo-banner.tall { aspect-ratio: 16 / 9; }

/* ---------- stat / proof band ---------- */
.stat-band { background: var(--orange); color: var(--ink); padding: 40px 0; }
.stat-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 24px; }
.stat-grid .stat b { display: block; font: 800 clamp(30px,4.4vw,48px)/1 var(--head); letter-spacing: -.03em; }
.stat-grid .stat span { display: block; margin-top: 8px; font: 11px var(--mono); letter-spacing: .1em; text-transform: uppercase; color: rgba(15,14,17,.72); }
.dark-panel { background: var(--ink); color: white; padding: 44px; position: relative; overflow: hidden; }
.dark-panel h3 { color: white; font-size: clamp(24px,3vw,34px); max-width: 700px; }
.dark-panel p { color: var(--white-70); max-width: 660px; }
.dark-panel .stat-grid .stat b { color: var(--orange); }
.dark-panel .stat-grid .stat span { color: var(--white-70); }

/* ---------- blog ---------- */
.post-card { border: 1px solid var(--line); padding: 24px; display: flex; flex-direction: column; gap: 6px; }
.post-card .post-date { font: 700 11px var(--mono); letter-spacing: .1em; text-transform: uppercase; color: #647281; }
.post-card h3 { font-size: 22px; margin: 10px 0 6px; }
.post-card p { font-size: 14px; color: #647281; margin: 0; }
.post-card .tag-row { margin-top: 14px; }
.tag-chip { display: inline-block; border: 1px solid var(--line); padding: 4px 10px; margin: 0 6px 6px 0; font: 700 10px var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--navy); }
.tag-chip.on-dark { border-color: rgba(255,255,255,.35); color: var(--white-70); }
.article-meta { display: flex; flex-wrap: wrap; gap: 18px; align-items: center; font: 700 11px var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--white-70); margin-top: 18px; }
.article-tags { margin-top: 18px; }
.article-body { max-width: 720px; margin-top: 40px; }
.article-body h2 { font-size: clamp(24px,3vw,32px); margin-top: 44px; margin-bottom: 14px; }
.article-body h2:first-child { margin-top: 0; }
.article-body p { color: #455669; font-size: 16.5px; line-height: 1.7; margin: 0 0 20px; }
.article-body ul, .article-body ol { margin: 0 0 20px; padding-left: 22px; color: #455669; font-size: 16.5px; line-height: 1.7; }
.article-body li { margin-bottom: 8px; }
.article-body strong { color: var(--navy); }
.article-body a { color: var(--orange-dark); text-decoration: underline; }
.article-cta { border: 1px solid var(--line); padding: 28px; margin-top: 44px; }
.empty-state { border: 1px solid var(--line); padding: 48px; text-align: center; }
.empty-state p { color: #647281; margin: 0; }

/* ---------- tables ---------- */
.table-wrap { overflow-x: auto; }
.token-table, .data-table { width: 100%; border-collapse: collapse; margin-top: 20px; font-size: 14.5px; min-width: 640px; }
.token-table th, .data-table th { text-align: left; background: var(--mist); color: var(--navy); font: 700 10px var(--mono); letter-spacing: .12em; text-transform: uppercase; }
.token-table th, .token-table td, .data-table th, .data-table td { padding: 13px 15px; border: 1px solid var(--line); vertical-align: top; }
.data-table td strong { color: var(--navy); }

/* ---------- lists ---------- */
.guide-list { margin: 0; padding: 0; list-style: none; }
.guide-list li { padding: 12px 0 12px 24px; border-bottom: 1px solid var(--line); position: relative; color: #455669; }
.guide-list li:last-child { border-bottom: none; }
.guide-list li::before { content:"+"; position:absolute; left:0; color:var(--orange); font-weight: 800; }

/* ---------- FAQ accordion ---------- */
.faq-list { border-top: 1px solid var(--line); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-q { width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 16px;
  background: none; border: none; text-align: left; padding: 22px 4px; cursor: pointer; font: 700 17px var(--sans); color: var(--navy); }
.faq-q .plus { flex: none; width: 26px; height: 26px; border: 2px solid var(--orange); color: var(--orange); display: grid; place-items: center; font: 800 15px var(--mono); }
.faq-item[data-open="true"] .plus { background: var(--orange); color: var(--ink); }
.faq-a { padding: 0 4px 0; max-height: 0; overflow: hidden; color: #455669; font-size: 15.5px; transition: max-height .22s ease; }
.faq-a > div { padding-bottom: 22px; }
.faq-item[data-open="true"] .faq-a { max-height: 800px; }
@media (prefers-reduced-motion: reduce) { .faq-a { transition: none; } }

/* ---------- forms ---------- */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 18px; }
.field.full { grid-column: 1 / -1; }
label { font: 700 11px var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--navy); }
label .opt { color: #566575; text-transform: none; letter-spacing: 0; font-family: var(--sans); font-weight: 400; }
input, select, textarea {
  font: 400 16px var(--sans); color: var(--navy); background: white; border: 2px solid var(--line);
  padding: 12px 14px; min-height: 44px; width: 100%;
}
textarea { min-height: 120px; resize: vertical; }
input:focus, select:focus, textarea:focus { outline: 3px solid var(--orange); outline-offset: 1px; border-color: var(--navy); }
.hp-field { position: absolute; left: -9999px; opacity: 0; }
.form-note { font-size: 13px; color: #566575; }
.form-panel { border: 1px solid var(--line); padding: 32px; }
.thanks-panel { display: none; border: 2px solid var(--orange); padding: 32px; }
.thanks-panel.is-visible { display: block; }
.thanks-panel[hidden] { display: none !important; }

/* ---------- footer ---------- */
.site-footer { background: var(--ink); color: white; padding: 56px 0 28px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 32px; padding-bottom: 36px; border-bottom: 1px solid rgba(255,255,255,.10); }
.footer-grid h4 { color: var(--orange); font: 700 11px var(--mono); letter-spacing: .16em; text-transform: uppercase; margin-bottom: 14px; }
.footer-grid ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.footer-grid a { color: var(--white-70); text-decoration: none; font-size: 14px; }
.footer-grid a:hover { color: var(--orange); }
.footer-mark { font: 800 26px/.9 var(--head); letter-spacing: -.06em; text-transform: uppercase; color: white; }
.footer-mark .orange { color: var(--orange); }
.footer-tag { color: var(--white-70); font-size: 14px; margin: 14px 0 0; max-width: 320px; }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; padding-top: 22px; }
.footer-copy { font: 10px var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--white-55); }
.footer-parent { font: 11px var(--sans); color: var(--white-55); max-width: 520px; }
.footer-parent a { color: var(--white-70); text-decoration: underline; }

/* ---------- utility ---------- */
.cta-band { background: var(--navy); color: white; padding: 56px 0; text-align: center; }
.cta-band h2 { color: white; }
.cta-band p.lede { color: var(--white-70); margin: 18px auto 30px; }
.cta-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.center { text-align: center; margin-left: auto; margin-right: auto; }
.mt-8 { margin-top: 8px; } .mt-16 { margin-top: 16px; } .mt-24 { margin-top: 24px; } .mt-32 { margin-top: 32px; } .mt-40 { margin-top: 40px; }

@media (max-width: 900px) {
  .two-col, .principles, .card-grid, .card-grid.cols-4, .card-grid.cols-5, .card-grid.cols-6, .card-grid.cols-2, .photo-grid, .stat-grid, .footer-grid { grid-template-columns: 1fr 1fr; }
  .principle:nth-child(2n) { border-right: none; }
  .principle:nth-child(3n) { border-right: 1px solid var(--line); }
}
@media (max-width: 640px) {
  .two-col, .principles, .card-grid, .card-grid.cols-4, .card-grid.cols-5, .card-grid.cols-6, .card-grid.cols-2, .photo-grid, .stat-grid, .footer-grid, .form-grid { grid-template-columns: 1fr; }
  .principle { border-right: none !important; }
  section { padding: 44px 0; }
  .hero { padding: 44px 0 52px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
}

@media print {
  .site-header, .nav-toggle, .cta-band, .site-footer form { display: none; }
}