/* ============================================================
   Helix Aeronautics — Site Stylesheet
   helix_aeronautics.css
   Design Language: Field Manual
   Palette: Stars & Stripes (Old Glory Red #BF0A30 · Old Glory Blue #002868)
   ============================================================
   Sections:
     1.  CSS Custom Properties (Design Tokens)
     2.  Reset & Base
     3.  Navigation
     4.  Page Shell
     5.  Hero
     6.  Buttons
     7.  Stats Bar
     8.  Sections & Cards
     9.  About Page
    10.  Mission Banner
    11.  Capabilities Page
    12.  Contact Page
    13.  Footer
    14.  Responsive (≤ 900px)
   ============================================================ */

/* ── 1. DESIGN TOKENS ── */
:root {
  --red:        #BF0A30;
  --red-dim:    #96081f;
  --red-faint:  rgba(191,10,48,0.07);
  --blue:       #002868;
  --blue-mid:   #003580;
  --blue-faint: rgba(0,40,104,0.06);
  --white:      #FFFFFF;
  --off-white:  #F5F6F8;
  --light:      #EDF0F7;
  --border:     #D8DCE8;
  --border-2:   #C4CADB;
  --text:       #0d1a2e;
  --text-dim:   #3d5070;
  --text-mute:  #7a8faa;

  --font-display: 'Syncopate', sans-serif;
  --font-mono:    'Syncopate', monospace;
  --font-body:    'Syncopate', sans-serif;
}

/* ── 2. RESET & BASE ── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html { scroll-behavior: smooth; }

body {
  background: var(--white);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 18px;
  line-height: 1.8;
  overflow-x: hidden;
}

/* ── 3. NAVIGATION ── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: var(--white);
  border-bottom: 3px solid var(--blue);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 3rem;
  height: 64px;
}

nav::before {
  content: '';
  position: absolute;
  top: -4px; left: 0; right: 0;
  height: 4px;
  background: repeating-linear-gradient(
    90deg,
    var(--red) 0, var(--red) 33.33%,
    var(--white) 33.33%, var(--white) 66.66%,
    var(--blue) 66.66%, var(--blue) 100%
  );
}

.nav-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  cursor: pointer;
}

/* Brand container holds wordmark + rocket side by side */
.nav-brand {
  display: flex;
  align-items: center;
  gap: 1rem;
  cursor: pointer;
}

/* Wordmark: Helix Aeronautics text image */
.nav-logo-img {
  height: 32px;
  width: auto;
  display: block;
}

/* Rocket: wide, low-profile — sized to match wordmark height visually */
.nav-rocket-img {
  height: 28px;
  width: auto;
  display: block;
  opacity: 0.92;
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
}

.nav-links a {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.2s;
  cursor: pointer;
}

.nav-links a:hover,
.nav-links a.active { color: var(--red); }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--blue);
  transition: all 0.3s;
}

/* ── 4. PAGE SHELL ── */
.page { display: none; min-height: 100vh; padding-top: 64px; }
.page.active { display: block; }

/* ── 5. HERO ── */
.hero {
  position: relative;
  min-height: calc(100vh - 64px);
  display: flex;
  align-items: center;
  overflow: hidden;
  padding: 4rem 3rem;
  background: var(--blue);
  border-bottom: 4px solid var(--red);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(
      90deg,
      transparent, transparent 59px,
      rgba(255,255,255,0.03) 59px, rgba(255,255,255,0.03) 60px
    ),
    repeating-linear-gradient(
      0deg,
      transparent, transparent 59px,
      rgba(255,255,255,0.03) 59px, rgba(255,255,255,0.03) 60px
    );
}

.hero-rule {
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 6px;
  background: var(--red);
}

.hero-accent { display: none; }
.hero-line   { display: none; }

.hero-layout {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 3rem;
  width: 100%;
  max-width: 1200px;
}

.hero-content { position: relative; }

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: rgba(255,255,255,0.6);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.hero-eyebrow::before {
  content: '\2605';   /* ★ solid star */
  color: var(--white);
  font-size: 1rem;
  line-height: 1;
  width: auto;
  height: auto;
  background: none;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 5.5vw, 5rem);
  font-weight: 800;
  line-height: 1.0;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--white);
  margin-bottom: 1.5rem;
}

.hero h1 .accent { color: var(--red); }

.hero-sub {
  font-size: 1.05rem;
  font-weight: 400;
  color: rgba(255,255,255,0.75);
  max-width: 520px;
  margin-bottom: 2.5rem;
  line-height: 1.8;
}

.hero-logo-panel {
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-logo-img {
  width: 100%;
  max-width: 460px;
  height: auto;
  display: block;
  opacity: 0.92;
}

/* ── 6. BUTTONS ── */
.btn-primary {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--white);
  background: var(--red);
  border: none;
  padding: 0.8rem 2rem;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s, transform 0.15s;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
}

.btn-primary:hover { background: var(--red-dim); transform: translateY(-1px); }

.btn-outline {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--white);
  background: transparent;
  border: 2px solid rgba(255,255,255,0.4);
  padding: 0.8rem 2rem;
  cursor: pointer;
  text-decoration: none;
  margin-left: 1rem;
  transition: border-color 0.2s;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
}

.btn-outline:hover { border-color: var(--white); }

/* ── 7. STATS BAR ── */
.stats-bar {
  background: var(--off-white);
  border-bottom: 1px solid var(--border);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.stat {
  text-align: center;
  border-right: 1px solid var(--border);
  padding: 1.75rem 1rem;
  border-top: 4px solid var(--blue);
}

.stat:nth-child(even) { border-top-color: var(--red); }
.stat:last-child { border-right: none; }

.stat-num {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--blue);
  line-height: 1.1;
  margin-bottom: 0.4rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.stat-label {
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--text-dim);
  font-family: var(--font-body);
  font-weight: 400;
}

/* ── 8. SECTIONS ── */
.section { padding: 5rem 3rem; }
.section-header { margin-bottom: 3rem; }

.section-tag {
  font-family: var(--font-mono);
  font-size: 0.73rem;
  color: var(--red);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.section-tag::before {
  content: '\2605';
  display: block;
  font-size: 0.85rem;
  color: var(--red);
  line-height: 1;
  width: auto;
  height: auto;
  background: none;
}

.section h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--blue);
  line-height: 1.1;
}

.section p.lead {
  font-size: 1rem;
  color: var(--text-dim);
  max-width: 720px;
  margin-top: 1rem;
  font-weight: 400;
  line-height: 1.8;
}

/* ── 8b. CARD GRID ── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1px;
  background: var(--border);
}

.card {
  background: var(--white);
  padding: 2.25rem 2rem;
  position: relative;
  overflow: hidden;
  transition: background 0.2s;
  border-top: 4px solid var(--blue);
}

.card:nth-child(even) { border-top-color: var(--red); }

.card::before {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 0;
  height: 3px;
  background: var(--red);
  transition: width 0.3s;
}

.card:hover { background: var(--off-white); }
.card:hover::before { width: 100%; }

.card-icon {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--red);
  letter-spacing: 0.15em;
  margin-bottom: 1rem;
}

.card h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 0.75rem;
}

.card p {
  font-size: 0.92rem;
  color: var(--text-dim);
  line-height: 1.75;
}

/* ── 8c. DIVIDER ── */
.cyan-divider {
  height: 4px;
  background: linear-gradient(90deg, var(--red) 0%, var(--blue) 50%, transparent 100%);
}

/* ── 9. ABOUT PAGE ── */
.about-hero {
  background: var(--blue);
  padding: 5rem 3rem 4rem;
  border-bottom: 4px solid var(--red);
  position: relative;
  overflow: hidden;
}

.about-hero::after {
  content: 'HELIX';
  position: absolute;
  right: -1rem;
  bottom: -2.5rem;
  font-family: var(--font-display);
  font-size: 11rem;
  font-weight: 800;
  color: rgba(255,255,255,0.04);
  letter-spacing: 0.05em;
  pointer-events: none;
}

.about-hero .section-tag { color: rgba(255,255,255,0.6); }
.about-hero .section-tag::before { content: '\2605'; color: var(--white); background: none; font-size: 0.85rem; }

.about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3.5rem);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--white);
  margin-top: 0.5rem;
  position: relative;
  line-height: 1.1;
}

.about-hero h1 span { color: var(--red); }

.about-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  padding: 5rem 3rem;
  align-items: start;
  background: var(--white);
}

.about-text p {
  color: var(--text-dim);
  margin-bottom: 1.5rem;
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.85;
}

.about-text p strong {
  color: var(--text);
  font-weight: 700;
}

.value-list { list-style: none; }

.value-list li {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
}

.value-list li:last-child { border-bottom: none; }

.value-icon {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--white);
  background: var(--blue);
  padding: 0.35rem 0.6rem;
  letter-spacing: 0.1em;
  flex-shrink: 0;
  margin-top: 2px;
  font-weight: 700;
}

.value-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 0.25rem;
}

.value-desc {
  font-size: 0.92rem;
  color: var(--text-dim);
  line-height: 1.7;
}

/* ── 10. MISSION BANNER ── */
.mission-banner {
  background: var(--red);
  padding: 3rem;
  position: relative;
  overflow: hidden;
  border-top: 4px solid var(--blue);
}

.mission-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    45deg,
    transparent, transparent 20px,
    rgba(0,0,0,0.04) 20px, rgba(0,0,0,0.04) 40px
  );
}

.mission-banner blockquote {
  position: relative;
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 2.5vw, 1.8rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--white);
  max-width: 800px;
  line-height: 1.4;
}

/* ── 11. CAPABILITIES PAGE ── */
.cap-hero {
  background: var(--blue);
  padding: 5rem 3rem 4rem;
  border-bottom: 4px solid var(--red);
}

.cap-hero .section-tag { color: rgba(255,255,255,0.6); }
.cap-hero .section-tag::before { content: '\2605'; color: var(--white); background: none; font-size: 0.85rem; }

.service-row {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 0;
  border-bottom: 1px solid var(--border);
}

.service-row:last-child { border-bottom: none; }

.service-num {
  background: var(--off-white);
  padding: 3rem 2.5rem;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  border-right: 1px solid var(--border);
  border-left: 4px solid var(--blue);
}

.service-num-text {
  font-family: var(--font-mono);
  font-size: 3rem;
  color: rgba(0,40,104,0.15);
  line-height: 1;
  margin-bottom: 1rem;
}

.service-num h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--blue);
}

.service-detail {
  padding: 3rem;
  background: var(--white);
}

.service-detail p {
  font-size: 1rem;
  color: var(--text-dim);
  line-height: 1.85;
  margin-bottom: 1.25rem;
  font-weight: 400;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--blue);
  background: var(--blue-faint);
  border: 1px solid var(--border);
  padding: 0.3rem 0.75rem;
}

/* ── 12. CONTACT PAGE ── */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  min-height: calc(100vh - 64px - 72px);
}

.contact-info {
  background: var(--blue);
  padding: 5rem 3rem;
  border-right: 4px solid var(--red);
}

.contact-info .section-tag { color: rgba(255,255,255,0.6); }
.contact-info .section-tag::before { content: '\2605'; color: var(--white); background: none; font-size: 0.85rem; }

.contact-info h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--white);
  margin-top: 0.5rem;
  line-height: 1.1;
}

.contact-info h2 span { color: var(--red); }

.contact-info > p {
  font-size: 1rem;
  color: rgba(255,255,255,0.7);
  line-height: 1.8;
  font-weight: 400;
  margin-top: 1.25rem;
  max-width: 380px;
  margin-bottom: 2.5rem;
}

.contact-detail {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.contact-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--red);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  min-width: 80px;
  padding-top: 3px;
}

.contact-value {
  font-size: 0.95rem;
  color: rgba(255,255,255,0.75);
  font-family: var(--font-body);
  line-height: 1.6;
}

.contact-note {
  margin-top: 2.5rem;
  padding: 1.25rem 1.5rem;
  background: rgba(255,255,255,0.07);
  border-left: 3px solid var(--red);
}

.contact-note-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--red);
  letter-spacing: 0.15em;
  margin-bottom: 0.5rem;
}

.contact-note p {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.6);
  margin: 0;
  line-height: 1.7;
}

.contact-form {
  padding: 5rem 3rem;
  background: var(--off-white);
}

.contact-form .section-tag { color: var(--red); }

.form-group { margin-bottom: 1.5rem; }

.form-group label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-mute);
  margin-bottom: 0.5rem;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  background: var(--white);
  border: 1px solid var(--border-2);
  border-top: 3px solid var(--border);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1rem;
  padding: 0.75rem 1rem;
  outline: none;
  transition: border-color 0.2s;
  appearance: none;
  border-radius: 0;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--blue);
  border-top-color: var(--blue);
}

.form-group textarea { resize: vertical; min-height: 140px; }

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.form-submit { margin-top: 1rem; }

/* CTA section */
.cta-section {
  background: var(--blue);
  text-align: center;
  padding: 5rem 3rem;
  border-top: 4px solid var(--red);
}

.cta-section .section-tag {
  justify-content: center;
  color: rgba(255,255,255,0.6);
}

.cta-section .section-tag::before { content: '\2605'; color: var(--white); background: none; font-size: 0.85rem; }

.cta-section h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--white);
  margin-bottom: 1rem;
  line-height: 1.1;
}

.cta-section p {
  color: rgba(255,255,255,0.65);
  max-width: 520px;
  margin: 0 auto 2rem;
  font-weight: 400;
  font-size: 1rem;
  line-height: 1.8;
}

/* ── 13. FOOTER ── */
footer {
  background: var(--blue);
  border-top: 4px solid var(--red);
  padding: 1.75rem 3rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-logo {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--white);
}

.footer-copy {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: rgba(255,255,255,0.45);
  letter-spacing: 0.1em;
}

/* ── 14. RESPONSIVE (≤ 900px) ── */
@media (max-width: 900px) {
  nav { padding: 0 1.5rem; }
  .nav-brand { gap: 0.6rem; }
  .nav-logo-img { height: 24px; }
  .nav-rocket-img { height: 20px; }
  .nav-links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 64px; left: 0; right: 0;
    background: var(--white);
    border-bottom: 3px solid var(--blue);
    padding: 1rem 1.5rem;
    gap: 0;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 0.75rem 0; display: block; border-bottom: 1px solid var(--border); }
  .hamburger { display: flex; }
  .hero { padding: 3rem 1.5rem; }
  .hero-layout { grid-template-columns: 1fr; }
  .hero-logo-panel { justify-content: flex-start; margin-top: 2rem; }
  .hero-logo-img { max-width: 320px; }
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
  .stat { border-right: none; border-bottom: 1px solid var(--border); }
  .stat:last-child { border-bottom: none; }
  .section { padding: 3.5rem 1.5rem; }
  .about-body { grid-template-columns: 1fr; gap: 2rem; padding: 3rem 1.5rem; }
  .about-hero { padding: 3rem 1.5rem; }
  .service-row { grid-template-columns: 1fr; }
  .service-num { border-right: none; border-bottom: 1px solid var(--border); padding: 2rem 1.5rem; }
  .service-detail { padding: 2rem 1.5rem; }
  .contact-grid { grid-template-columns: 1fr; }
  .contact-info { border-right: none; border-bottom: 4px solid var(--red); padding: 3rem 1.5rem; }
  .contact-form { padding: 3rem 1.5rem; }
  .form-row { grid-template-columns: 1fr; }
  footer { padding: 1.5rem; flex-direction: column; align-items: flex-start; }
  .cap-hero { padding: 3rem 1.5rem; }
  .mission-banner { padding: 2.5rem 1.5rem; }
  .cta-section { padding: 3.5rem 1.5rem; }
}