/* ==========================================================================
   E-PROPS for Drones & UAV — design system
   ========================================================================== */

:root {
  --carbon: #17181a;
  --carbon-soft: #2a2c2f;
  --red: #e2231a;
  --red-dark: #b81a13;
  --white: #ffffff;
  --grey-50: #f7f7f8;
  --grey-100: #eef0f1;
  --grey-300: #d6d9dc;
  --grey-500: #8b9096;
  --grey-700: #4a4e53;
  --text: #1c1d1f;
  --max-width: 1180px;
  --radius: 10px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
  --shadow-soft: 0 2px 10px rgba(0, 0, 0, 0.06);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.mono, .stats .num, .result-box .val, .result-box .unit {
  font-family: "IBM Plex Mono", "Courier New", monospace;
  font-variant-numeric: tabular-nums;
}

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

a { color: var(--red); text-decoration: none; }
a:hover { color: var(--red-dark); text-decoration: underline; }

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

h1, h2, h3 {
  font-family: "Barlow Condensed", "IBM Plex Sans", sans-serif;
  line-height: 1.1;
  font-weight: 700;
  letter-spacing: 0.01em;
  text-transform: uppercase;
}
h1 { font-size: clamp(2.3rem, 4.6vw, 3.6rem); margin: 0 0 16px; font-weight: 800; text-wrap: balance; }
h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); margin: 0 0 14px; text-wrap: balance; }
h3 { font-size: 1.25rem; margin: 0 0 10px; letter-spacing: 0.02em; }
p { margin: 0 0 16px; }

.eyebrow {
  display: inline-block;
  font-family: "IBM Plex Mono", monospace;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--red);
  margin-bottom: 14px;
}
.eyebrow::before { content: "// "; opacity: 0.6; }

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--grey-100);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 96px;
  gap: 24px;
}

.brand { display: flex; align-items: center; gap: 14px; flex-shrink: 0; }
.brand img { height: 58px; width: auto; }
.brand small {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--grey-700);
  text-transform: uppercase;
  border-left: 1px solid var(--grey-300);
  padding-left: 12px;
  line-height: 1.3;
}

nav.main-nav { display: flex; align-items: center; gap: 4px; }

nav.main-nav > ul { display: flex; list-style: none; margin: 0; padding: 0; gap: 2px; }

nav.main-nav > ul > li { position: relative; }

nav.main-nav > ul > li > a {
  display: block;
  padding: 12px 14px;
  color: var(--text);
  font-weight: 600;
  font-size: 0.92rem;
  border-radius: 6px;
}

nav.main-nav > ul > li > a:hover { background: var(--grey-50); color: var(--carbon); text-decoration: none; }
nav.main-nav > ul > li.active > a { color: var(--red); }

.submenu {
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--white);
  border: 1px solid var(--grey-100);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  min-width: 260px;
  padding: 8px;
  list-style: none;
  margin: 6px 0 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition: 0.15s ease;
}

nav.main-nav > ul > li:hover .submenu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.submenu li a {
  display: block;
  padding: 9px 12px;
  border-radius: 6px;
  font-size: 0.88rem;
  color: var(--text);
  font-weight: 500;
}
.submenu li a:hover { background: var(--grey-50); color: var(--red); text-decoration: none; }
.submenu li a.soon { color: var(--grey-500); cursor: default; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.submenu li a.soon:hover { background: none; color: var(--grey-500); }
.badge-soon { font-family: "IBM Plex Mono", monospace; font-size: 0.62rem; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; color: var(--grey-500); background: var(--grey-100); border-radius: 4px; padding: 2px 6px; }

.nav-toggle { display: none; }

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

.hero {
  position: relative;
  color: var(--white);
  background: var(--carbon);
  min-height: 62vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero img.bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.55;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(23, 24, 26, 0.35) 0%, rgba(23, 24, 26, 0.85) 100%);
}

.hero-content { position: relative; z-index: 2; padding: 90px 0; }
.hero .eyebrow { color: #ff6b63; font-size: clamp(1.1rem, 2vw, 1.4rem); }
.hero h1 { color: var(--white); max-width: 780px; }
.hero p.lead { font-size: 1.15rem; max-width: 640px; color: var(--grey-100); }

.hero-actions { display: flex; gap: 14px; margin-top: 28px; flex-wrap: wrap; }

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 24px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.92rem;
  border: 2px solid transparent;
  cursor: pointer;
}

.btn-primary { background: var(--red); color: var(--white); }
.btn-primary:hover { background: var(--red-dark); color: var(--white); text-decoration: none; }

.btn-ghost { background: transparent; border-color: rgba(255, 255, 255, 0.5); color: var(--white); }
.btn-ghost:hover { border-color: var(--white); background: rgba(255, 255, 255, 0.08); color: var(--white); text-decoration: none; }

.btn-outline { background: transparent; border-color: var(--grey-300); color: var(--text); }
.btn-outline:hover { border-color: var(--red); color: var(--red); text-decoration: none; }

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

section { padding: 72px 0; }
section.tight { padding: 48px 0; }
section.grey { background: var(--grey-50); }
section.carbon { background: var(--carbon); color: var(--white); }
section.carbon h2 { color: var(--white); }

.section-head { max-width: 720px; margin-bottom: 40px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }

/* ---------- Feature grid ---------- */

.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.feature {
  padding: 6px 0;
}

.check-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.check-list li { display: flex; gap: 12px; align-items: flex-start; }
.check-list li svg { flex-shrink: 0; margin-top: 3px; color: var(--red); }

/* ---------- Range cards ---------- */

.range-card {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--grey-100);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--white);
  box-shadow: var(--shadow-soft);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.range-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }

.range-card .thumb { background: var(--grey-50); padding: 28px; display: flex; align-items: center; justify-content: center; min-height: 220px; }
.range-card .thumb img { max-height: 180px; width: auto; margin: 0 auto; }
.range-card .body { padding: 26px 28px 30px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.range-card .body h3 { color: var(--text); }
.range-card .body ul { margin: 0 0 8px; padding-left: 0; list-style: none; font-size: 0.92rem; color: var(--grey-700); display: grid; gap: 6px; }
.range-card .body ul li::before { content: "—  "; color: var(--red); font-weight: 700; }
.range-card .cta { margin-top: auto; }

/* ---------- Page header (interior pages) ---------- */

.page-header {
  background: var(--carbon);
  color: var(--white);
  padding: 56px 0 44px;
}
.page-header .eyebrow { color: #ff6b63; }
.page-header h1 { color: var(--white); margin-bottom: 6px; }
.breadcrumb { font-size: 0.85rem; color: var(--grey-300); }
.breadcrumb a { color: var(--grey-300); }
.breadcrumb a:hover { color: var(--white); }

/* ---------- TOC / anchored sections ---------- */

.layout-with-toc {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 48px;
  align-items: start;
  padding-top: 48px;
}

.toc {
  position: sticky;
  top: 116px;
  border-left: 2px solid var(--grey-100);
  padding-left: 18px;
}
.toc div.toc-label { font-size: 0.72rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--grey-500); margin-bottom: 12px; }
.toc ol { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.toc a { color: var(--grey-700); font-size: 0.92rem; font-weight: 600; }
.toc a:hover { color: var(--red); text-decoration: none; }

.content-block { max-width: 760px; }
.content-block h2 { scroll-margin-top: 120px; margin-top: 8px; }
.content-block section.inline { padding: 0 0 44px; border-bottom: 1px solid var(--grey-100); margin-bottom: 44px; }
.content-block section.inline:last-child { border-bottom: none; }
.content-block ul.plain { padding-left: 20px; margin: 0 0 16px; color: var(--text); }
.content-block ul.plain li { margin-bottom: 8px; }
.legal-meta { color: var(--grey-500); font-size: 0.88rem; }

.callout {
  background: var(--grey-50);
  border: 1px solid var(--grey-100);
  border-radius: var(--radius);
  padding: 20px 22px;
  margin: 18px 0;
  display: flex;
  gap: 14px;
  align-items: flex-start;
}
.callout svg { color: var(--red); flex-shrink: 0; margin-top: 2px; }
.callout a.pdf-link { font-weight: 800; }

figure.shot { text-align: center; margin: 16px 0; }
figure.shot img { margin: 0 auto; border-radius: var(--radius); }
figure.shot figcaption { font-size: 0.85rem; color: var(--grey-500); margin-top: 10px; }

table.specs { width: 100%; border-collapse: collapse; margin: 18px 0 28px; font-size: 0.94rem; }
table.specs th, table.specs td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--grey-100); }
table.specs th { color: var(--grey-700); font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.04em; }

/* ---------- Stats strip ---------- */

.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stats .num { font-size: clamp(1.8rem, 3vw, 2.4rem); font-weight: 800; color: var(--red); }
.stats .label { font-size: 0.85rem; color: var(--grey-300); }

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

footer.site-footer { background: var(--carbon); color: var(--grey-300); padding: 56px 0 28px; }
footer.site-footer .cols { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
footer.site-footer h3 { color: var(--white); font-size: 0.95rem; }
footer.site-footer a { color: var(--grey-300); }
footer.site-footer a:hover { color: var(--white); }
footer.site-footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; font-size: 0.9rem; }
footer.site-footer .bottom { border-top: 1px solid var(--carbon-soft); padding-top: 22px; font-size: 0.8rem; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }

/* ---------- Calculator form ---------- */

.calc-form { background: var(--grey-50); border: 1px solid var(--grey-100); border-radius: var(--radius); padding: 28px; margin: 24px 0; }
.calc-form fieldset { border: none; padding: 0; margin: 0 0 22px; }
.calc-form legend { font-weight: 700; font-size: 0.95rem; margin-bottom: 12px; padding: 0; }
.calc-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px 24px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field label { font-size: 0.86rem; font-weight: 600; color: var(--grey-700); }
.field input, .field select {
  padding: 10px 12px;
  border: 1px solid var(--grey-300);
  border-radius: 6px;
  font-size: 0.95rem;
  font-family: inherit;
  background: var(--white);
}
.field input:focus, .field select:focus { outline: none; border-color: var(--red); }
.radio-row { display: flex; gap: 18px; align-items: center; }
.radio-row label { display: flex; align-items: center; gap: 6px; font-weight: 500; font-size: 0.92rem; color: var(--text); }
.calc-results { margin-top: 22px; padding-top: 22px; border-top: 1px dashed var(--grey-300); }
.calc-results .grid-4 { grid-template-columns: repeat(4, 1fr); }
.result-box { background: var(--white); border: 1px solid var(--grey-100); border-radius: 8px; padding: 14px 16px; text-align: center; }
.result-box .val { font-size: 1.4rem; font-weight: 800; color: var(--red); }
.result-box .unit { font-size: 0.78rem; color: var(--grey-500); text-transform: uppercase; }
.result-box label { display: block; font-size: 0.72rem; font-weight: 700; color: var(--grey-500); text-transform: uppercase; letter-spacing: 0.04em; margin-bottom: 6px; }
.result-box input {
  border: none;
  background: transparent;
  text-align: center;
  font-family: "IBM Plex Mono", monospace;
  font-variant-numeric: tabular-nums;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--red);
  width: 100%;
  padding: 0;
}
.result-box .unit { display: block; margin-top: 2px; }
.calc-note { font-size: 0.85rem; color: var(--grey-500); margin-top: 18px; }
.calc-formula { background: var(--white); border: 1px solid var(--grey-100); border-radius: 8px; padding: 16px 20px; font-family: "IBM Plex Mono", monospace; font-size: 0.85rem; color: var(--grey-700); line-height: 1.8; overflow-x: auto; }

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

@media (max-width: 900px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); gap: 24px 16px; }
  .layout-with-toc { grid-template-columns: 1fr; }
  .toc { position: static; border-left: none; border-top: 2px solid var(--grey-100); padding: 18px 0 0; margin-bottom: 12px; }
  .toc ol { display: flex; flex-wrap: wrap; gap: 8px 18px; }
  footer.site-footer .cols { grid-template-columns: 1fr; gap: 28px; }
}

@media (max-width: 720px) {
  .brand small { display: none; }
  nav.main-nav { position: fixed; top: 76px; left: 0; right: 0; bottom: 0; background: var(--white); flex-direction: column; align-items: stretch; padding: 12px 20px; overflow-y: auto; transform: translateX(100%); transition: transform 0.2s ease; }
  nav.main-nav.open { transform: translateX(0); }
  nav.main-nav > ul { flex-direction: column; width: 100%; gap: 0; }
  nav.main-nav > ul > li { border-bottom: 1px solid var(--grey-100); }
  .submenu { position: static; opacity: 1; visibility: visible; box-shadow: none; border: none; display: none; margin: 0; padding-left: 12px; }
  nav.main-nav > ul > li.open .submenu { display: block; }
  .nav-toggle { display: block; background: none; border: none; font-size: 1.6rem; cursor: pointer; padding: 4px 8px; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .calc-grid, .calc-results .grid-4 { grid-template-columns: 1fr; }
  .hero-content { padding: 60px 0; }
}