/* =================================================================
   ENDURANCE AERO LABS · SHARED CSS
   Design system used by every page (index, about, mission briefs).
   =================================================================
*/

/* =========================
   TOKENS
   ========================= */
:root {
  --bg:        #0B0E14;
  --bg-soft:   #11151E;
  --panel:     #161B26;
  --fg:        #EDE7D9;
  --fg-soft:   #C9C3B6;
  --fg-mute:   #7B756A;
  --rule:      rgba(237, 231, 217, 0.12);
  --rule-soft: rgba(237, 231, 217, 0.05);
  --accent:    #E0995A;
  --accent-2:  #7AA0B8;
  --danger:    #C25B4B;

  --serif: "Instrument Serif", "Times New Roman", serif;
  --sans:  "DM Sans", -apple-system, BlinkMacSystemFont, sans-serif;
  --mono:  "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --pad-x: clamp(20px, 4vw, 64px);
  --max-w: 1320px;
}

/* =========================
   BASE
   ========================= */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

::selection { background: var(--accent); color: var(--bg); }

/* Graph-paper background */
body::before {
  content: "";
  position: fixed; inset: 0;
  background-image:
    linear-gradient(var(--rule-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--rule-soft) 1px, transparent 1px);
  background-size: 80px 80px;
  pointer-events: none;
  z-index: 0;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 90%);
}

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--pad-x);
  position: relative;
  z-index: 1;
}

/* =========================
   NAV
   ========================= */
.nav {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: rgba(11, 14, 20, 0.72);
  border-bottom: 1px solid var(--rule-soft);
}
.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 16px var(--pad-x);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  display: flex; align-items: center; gap: 12px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg);
  font-weight: 500;
}
.brand-mark {
  width: 22px; height: 22px;
  position: relative;
  flex: 0 0 22px;
}
.brand-mark::before, .brand-mark::after {
  content: ""; position: absolute; background: var(--accent);
}
.brand-mark::before { left: 50%; top: 0; bottom: 0; width: 1px; transform: translateX(-50%); }
.brand-mark::after  { top: 50%; left: 0; right: 0; height: 1px; transform: translateY(-50%); }
.brand-mark span {
  position: absolute; inset: 4px;
  border: 1px solid var(--accent);
  border-radius: 50%;
}

.nav-links {
  display: flex; gap: 28px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--fg-soft);
  font-weight: 500;
  align-items: center;
}
.nav-links > a, .nav-links .nav-dropdown-trigger {
  transition: color .25s ease;
  position: relative;
}
.nav-links > a::after, .nav-links .nav-dropdown-trigger::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -6px;
  height: 1px; background: var(--accent);
  transform: scaleX(0); transform-origin: left;
  transition: transform .35s ease;
}
.nav-links > a:hover, .nav-links .nav-dropdown-trigger:hover { color: var(--fg); }
.nav-links > a:hover::after, .nav-links .nav-dropdown-trigger:hover::after { transform: scaleX(1); }
.nav-links > a.active, .nav-links .nav-dropdown-trigger.active { color: var(--accent); }
.nav-links > a.active::after, .nav-links .nav-dropdown-trigger.active::after { transform: scaleX(1); }

.nav-status {
  display: flex; align-items: center; gap: 8px;
  font-family: var(--mono); font-size: 11px;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--fg-soft);
  font-weight: 500;
}
.status-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(224, 153, 90, 0.15);
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 4px rgba(224, 153, 90, 0.15); }
  50%      { box-shadow: 0 0 0 8px rgba(224, 153, 90, 0.02); }
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Hide desktop nav and status below 980px — replaced by mobile menu */
@media (max-width: 980px) {
  .nav-links { display: none; }
}
@media (max-width: 760px) {
  .nav-status { display: none; }
}

/* =========================
   MOBILE MENU (built by JS, styled here)
   ========================= */

/* Hamburger button — only shows below 980px */
.nav-burger {
  display: none;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid var(--rule);
  cursor: pointer;
  position: relative;
  padding: 0;
  flex-shrink: 0;
  transition: border-color .2s ease;
}
.nav-burger:hover { border-color: var(--accent); }
.nav-burger .bar {
  position: absolute;
  left: 12px; right: 12px; height: 1px;
  background: var(--fg);
  transition: transform .35s cubic-bezier(.5,0,.2,1), opacity .2s ease, background .2s ease;
}
.nav-burger .bar:nth-child(1) { top: 16px; }
.nav-burger .bar:nth-child(2) { top: 22px; }
.nav-burger .bar:nth-child(3) { top: 28px; }
.nav-burger:hover .bar { background: var(--accent); }
.nav-burger.open .bar:nth-child(1) { transform: translateY(6px) rotate(45deg); background: var(--accent); }
.nav-burger.open .bar:nth-child(2) { opacity: 0; }
.nav-burger.open .bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); background: var(--accent); }

@media (max-width: 980px) {
  .nav-burger { display: block; }
}

/* Mobile drawer — full screen overlay */
.mobile-drawer {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(11, 14, 20, 0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  opacity: 0;
  pointer-events: none;
  transition: opacity .35s ease;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}
.mobile-drawer.open {
  opacity: 1;
  pointer-events: auto;
}
body.drawer-open {
  overflow: hidden;
}

.mobile-drawer-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px var(--pad-x);
  border-bottom: 1px solid var(--rule);
  flex-shrink: 0;
}
.mobile-drawer-eyebrow {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
}
.mobile-drawer-close {
  width: 44px; height: 44px;
  background: transparent;
  border: 1px solid var(--rule);
  cursor: pointer;
  position: relative;
  padding: 0;
  transition: border-color .2s ease;
}
.mobile-drawer-close:hover { border-color: var(--accent); }
.mobile-drawer-close::before,
.mobile-drawer-close::after {
  content: "";
  position: absolute;
  left: 12px; right: 12px; top: 50%;
  height: 1px;
  background: var(--fg);
  transition: background .2s ease;
}
.mobile-drawer-close::before { transform: rotate(45deg); }
.mobile-drawer-close::after  { transform: rotate(-45deg); }
.mobile-drawer-close:hover::before,
.mobile-drawer-close:hover::after { background: var(--accent); }

.mobile-drawer-body {
  flex: 1;
  padding: 40px var(--pad-x);
  overflow-y: auto;
}

.mobile-drawer-section {
  margin-bottom: 32px;
}
.mobile-drawer-section-label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--fg-mute);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 8px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 10px;
}
.mobile-drawer-section-label::before {
  content: "";
  width: 6px; height: 6px;
  background: var(--accent);
  border-radius: 50%;
}

/* Top-level drawer links */
.mobile-drawer a.md-link {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 18px 0;
  border-bottom: 1px solid var(--rule);
  font-family: var(--serif);
  font-size: 32px;
  line-height: 1;
  color: var(--fg);
  font-weight: 400;
  letter-spacing: -0.01em;
  transition: color .2s ease, padding-left .25s ease;
  min-height: 44px;
}
.mobile-drawer a.md-link:hover,
.mobile-drawer a.md-link:focus-visible {
  color: var(--accent);
  padding-left: 8px;
}
.mobile-drawer a.md-link .md-num {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--fg-mute);
  font-weight: 500;
}

/* Mission sub-links in drawer */
.mobile-drawer a.md-mission {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 16px;
  align-items: center;
  padding: 14px 0;
  border-bottom: 1px solid var(--rule);
  min-height: 44px;
  transition: padding-left .25s ease;
}
.mobile-drawer a.md-mission:hover,
.mobile-drawer a.md-mission:focus-visible {
  padding-left: 8px;
}
.mobile-drawer a.md-mission:hover .md-mission-name,
.mobile-drawer a.md-mission:focus-visible .md-mission-name {
  color: var(--accent);
}
.mobile-drawer .md-mission-id {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--accent);
  font-weight: 600;
}
.mobile-drawer .md-mission-name {
  font-family: var(--sans);
  font-size: 16px;
  color: var(--fg);
  font-weight: 500;
  transition: color .2s ease;
}

.mobile-drawer-foot {
  padding: 24px var(--pad-x) 32px;
  border-top: 1px solid var(--rule);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-mute);
  font-weight: 500;
  flex-shrink: 0;
}
.mobile-drawer-foot .md-foot-status {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--accent);
}

/* =========================
   iPAD-FRIENDLY INTERMEDIATE BREAKPOINTS
   ========================= */
@media (max-width: 760px) {
  /* Phones: slightly tighter base, larger touch targets */
  body { font-size: 15.5px; }
  section { padding: 70px 0 !important; }
}

@media (max-width: 480px) {
  /* Small phones: prevent crowded layouts */
  :root { --pad-x: 18px; }
}

/* =========================
   TOUCH / NO-HOVER REFINEMENTS
   ========================= */
@media (hover: none) {
  /* On touch devices, disable hover-only dropdown; JS handles it */
  .nav-dropdown:hover .nav-dropdown-menu {
    opacity: 0;
    pointer-events: none;
    transform: translateX(-50%) translateY(-8px);
  }
  .nav-dropdown.open .nav-dropdown-menu {
    opacity: 1;
    pointer-events: auto;
    transform: translateX(-50%) translateY(0);
  }
  /* Active state replaces hover */
  .mission:hover { background: transparent; }
}

/* Dropdown */
.nav-dropdown { position: relative; }
.nav-dropdown-trigger { display: inline-flex; align-items: center; gap: 6px; cursor: pointer; }
.nav-dropdown-trigger .caret {
  font-size: 9px;
  transition: transform .25s ease;
  color: var(--accent);
}
.nav-dropdown:hover .nav-dropdown-trigger .caret { transform: rotate(180deg); }

.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 18px);
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  min-width: 320px;
  background: rgba(17, 21, 30, 0.96);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--rule);
  padding: 12px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s ease, transform .25s ease;
  box-shadow: 0 24px 60px rgba(0,0,0,0.5);
  z-index: 60;
}
.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown:focus-within .nav-dropdown-menu {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}
.nav-dropdown-menu::before {
  content: "";
  position: absolute;
  top: -20px; left: 0; right: 0; height: 20px;
}
.nav-dropdown-menu a {
  display: grid;
  grid-template-columns: 60px 1fr;
  gap: 14px;
  align-items: center;
  padding: 10px 12px;
  text-transform: none;
  letter-spacing: 0.02em;
  transition: background .2s ease, color .2s ease, padding-left .2s ease;
}
.nav-dropdown-menu a:hover {
  background: rgba(224, 153, 90, 0.08);
  padding-left: 16px;
}
.nav-dropdown-menu a::after { display: none; }
.nav-dropdown-menu .dd-id {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--accent);
  letter-spacing: 0.14em;
  font-weight: 600;
}
.nav-dropdown-menu .dd-name {
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0;
  text-transform: none;
  color: var(--fg);
  font-weight: 500;
}
.nav-dropdown-sep {
  height: 1px; background: var(--rule); margin: 6px 12px;
}
.nav-dropdown-menu .dd-all {
  grid-template-columns: 1fr;
  color: var(--fg-soft);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.nav-dropdown-menu .dd-all:hover { color: var(--accent); }

/* =========================
   FOOTER
   ========================= */
footer {
  border-top: 1px solid var(--rule);
  padding: 32px 0 40px;
  margin-top: 60px;
}
.footer-inner {
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 16px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-mute);
  font-weight: 500;
}

/* =========================
   REVEAL ANIMATIONS
   ========================= */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .9s ease, transform .9s ease;
}
.reveal.in {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .status-dot { animation: none; }
}