@import url('https://fonts.googleapis.com/css2?family=Barlow+Condensed:wght@400;500;600;700;800&display=swap');

:root {
  --radius: 12px;

  /* Typography scale */
  --font-size-xs:   0.75rem;
  --font-size-sm:   0.875rem;
  --font-size-base:  1rem;
  --font-size-md:    1.125rem;
  --font-size-lg:    1.25rem;
  --font-size-xl:    1.5rem;
  --font-size-2xl:   2rem;
  --font-size-3xl:   2.75rem;
  --font-size-hero:  3.5rem;
  --line-height-tight: 1.2;
  --line-height-base:  1.6;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-bold:   700;

  /* Palette (bd22 variant) */
  --color-bg: #040810;            /* dark near-black */
  --color-bg-alt: #0a111a;
  --color-bg-card: #0f1420;         /* dark card background for elevated look */
  --color-text: #FFFFFF;           /* primary text on dark bg (WCAG AA compliant given contrasts) */
  --color-text-muted: #A0A0A0;      /* muted, accessible on dark backgrounds */
  --color-text-on-primary: #1A1A1A; /* text on primary button (primary is dark) */
  --color-primary: #00E5C8;          /* bioluminescent teal */
  --color-secondary: #E040FB;        /* magenta accent */
  --color-accent: #8AF9FF;
  --color-border: rgba(255,255,255,0.22);
  --color-shadow: rgba(0,0,0,0.65);
}

/* 3. CSS reset / base */
*,
*::before,
*::after { box-sizing: border-box; }
html, body { height: 100%; }
html, body { margin: 0; padding: 0; background: var(--color-bg); color: var(--color-text); font-family: 'Barlow Condensed', system-ui, -apple-system, "Segoe UI", Roboto, Arial; line-height: var(--line-height-base); }
img, video, iframe { max-width: 100%; height: auto; display: block; }

.container { width: 100%; margin: 0 auto; padding: 0 1rem; }

/* 6. Component styles (mandatory rules implemented per spec) */

/* Header / Logo / Nav */
.site-header {
  position: sticky;
  top: 0;
  min-height: 64px;
  overflow: visible;
  background: rgba(4,8,16,0.95);
  z-index: 999;
}

.site-header .container {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.5rem 1rem;
  width: 100%;
  margin: 0 auto;
}

/* Logo wrapper and image rules (MANDATORY) */
.site-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  overflow: hidden;
  max-height: 52px;
  text-decoration: none;
}
.site-logo img {
  height: 44px;
  width: auto;
  max-width: 160px;
  object-fit: contain;
  display: block;
}

/* Mobile nav toggle (hidden input) */
.nav-toggle-input {
  position: absolute;
  width: 0;
  height: 0;
  opacity: 0;
  pointer-events: none;
}

/* Hamburger icon (MANDATORY: white bars) */
.nav-toggle-label {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  cursor: pointer;
  margin-left: auto;
  padding: 0.4rem 0.6rem;
  z-index: 200;
  border-radius: 6px;
  background: rgba(0,0,0,0.45);
  border: 1.5px solid rgba(255,255,255,0.7);
}
.nav-toggle-label span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: #ffffff;
  border-radius: 2px;
  transition: 0.2s ease;
}

/* Mobile navigation panel (hidden by default) */
.site-nav {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  width: 100%;
  z-index: 500;
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
  box-shadow: 0 4px 16px rgba(0,0,0,0.18);
}
.nav-toggle-input:checked ~ .site-nav { display: block; }

/* Nav list / links (desktop/tablet: horizontal) */
.nav-list {
  display: flex;
  gap: 0;
  list-style: none;
  margin: 0;
  padding: 0;
  flex-direction: column; /* mobile-first: vertical */
}

/* Nav items / links */
.nav-item { }

/* NAV: standard links (tablet/desktop: small text) */
.nav-link {
  font-size: var(--font-size-sm);
  color: var(--color-text);
  text-decoration: none;
  padding: 0.75rem 1rem;
  display: block;
  transition: color 0.2s ease, transform 0.2s ease;
}
.nav-link:hover { color: #fff; text-decoration: underline; }

/* Dropdown nav (mandatory) */
.nav-dropdown { position: relative; }
.nav-dropdown-toggle { cursor: pointer; user-select: none; white-space: nowrap; }
.nav-dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 200px;
  z-index: 9999;
  list-style: none;
  margin: 0;
  padding: 0.5rem 0;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius, 6px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.18);
  white-space: nowrap;
}
.nav-dropdown:hover > .nav-dropdown-menu,
.nav-dropdown:focus-within > .nav-dropdown-menu {
  display: block;
}
.nav-dropdown-menu .nav-link {
  display: block;
  padding: 0.5rem 1.25rem;
  width: 100%;
  border-bottom: none;
}
.nav-dropdown-menu .nav-link:hover { background: var(--color-bg-alt); }

/* Mobile: indented under toggle */
@media (max-width: 767px) {
  .nav-dropdown-menu {
    position: static;
    box-shadow: none;
    border: none;
    padding-left: 1rem;
  }
}

/* Hero / section / cards / footer etc. */

.hero {
  width: 100%;
  background: linear-gradient(135deg, rgba(0,229,200,0.08) 0%, rgba(4,8,16,0.92) 100%), var(--color-bg);
  color: var(--color-text);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 0;
}

.hero-inner {
  display: flex;
  align-items: center;
  gap: 3rem;
  width: 100%;
  max-width: 1200px;
  padding: 0 1rem;
}
.hero-text { flex: 1 1 55%; }
.hero-media { flex: 1 1 40%; display: flex; justify-content: center; }

.hero-img {
  width: 100%; border-radius: var(--radius,12px); object-fit: cover; max-height: 460px; display: block;
}
.hero h1 {
  font-size: var(--font-size-hero);
  font-weight: 800;
  line-height: var(--line-height-tight);
  margin-bottom: 0.75rem;
}
.hero p { font-size: var(--font-size-base); color: var(--color-text); }

/* Hero image sizing across breakpoints handled in responsive section */

/* Card grid / cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}
.card {
  display: flex;
  flex-direction: column; /* MANDATORY: vertical card layout */
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  box-shadow:
    0 4px 6px rgba(0,0,0,0.25),
    0 10px 15px rgba(0,0,0,0.2);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.card:hover { transform: translateY(-4px); box-shadow:
  0 6px 10px rgba(0,0,0,0.28),
  0 16px 26px rgba(0,0,0,0.22);
}
.card img {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  display: block;
  border-top-left-radius: var(--radius);
  border-top-right-radius: var(--radius);
}
.card-content { padding: 1rem; color: var(--color-text); }
.card h4 { font-size: var(--font-size-lg); margin: 0.25rem 0 0.5rem; color: var(--color-text); }
.card p { margin: 0; color: var(--color-text-muted); }

/* Sections / typography wrappers */
.section { padding: 2rem 0; }
.section-title {
  font-size: var(--font-size-2xl);
  margin-bottom: 1rem;
  color: var(--color-text);
  font-weight: 700;
}

/* Footer */
.site-footer {
  background: #0b111a;
  color: var(--color-text);
  padding: 2rem 0;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0 1rem;
}
.footer-inner a { color: var(--color-text); }

/* FAQ accordion */
.faq-section { padding: 2rem 0; }
.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius, 8px);
  margin-bottom: 0.75rem;
  background: var(--color-bg-card);
  overflow: hidden;
  transition: 0.2s ease;
}
.faq-item[open] {
  border-color: var(--color-primary);
  box-shadow: 0 2px 12px var(--color-shadow);
}
.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.25rem;
  cursor: pointer;
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-md);
  list-style: none;
  user-select: none;
}
.faq-question::-webkit-details-marker { display: none; }
.faq-question::after {
  content: "+";
  font-size: 1.5rem;
  font-weight: 300;
  color: var(--color-primary);
  flex-shrink: 0;
  transition: transform 0.2s ease;
}
.faq-item[open] > .faq-question::after { content: "−"; }
.faq-answer { padding: 0 1.25rem 1.25rem; border-top: 1px solid var(--color-border); }
.faq-answer p { margin: 0.75rem 0 0; color: var(--color-text-muted); line-height: var(--line-height-base); }

/* Forms */
label { display: block; margin-bottom: 0.25rem; font-size: var(--font-size-xs); color: var(--color-text); }
input,
textarea,
select {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: #0a111b;
  color: var(--color-text);
  font-family: inherit;
  font-size: var(--font-size-sm);
}
textarea { min-height: 120px; resize: vertical; }

/* Tables */
table { width: 100%; border-collapse: collapse; }
th, td { padding: 0.75rem; border-bottom: 1px solid var(--color-border); text-align: left; }
th { font-weight: var(--font-weight-bold); }

/* Buttons */
.btn { display: inline-block; padding: 0.6rem 1rem; border-radius: var(--radius); border: 0; text-transform: uppercase; font-size: var(--font-size-sm); font-weight: var(--font-weight-medium); cursor: pointer; transition: all 0.2s ease; }
.btn + .btn { margin-left: 0.5rem; }
.btn-primary {
  background: var(--color-primary);
  color: var(--color-text-on-primary);
  box-shadow: inset 0 0 0 rgba(0,0,0,0);
}
.btn-primary:hover { filter: brightness(0.9); transform: translateY(-1px); }
.btn-secondary {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.btn-secondary:hover { background: var(--color-bg-alt); }

/* 9. Utility classes */
.text-center { text-align: center; }
.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.hidden { display: none !important; }

/* 10. Responsive breakpoints (base mobile-first already defined above) */

/* Tablet and up (min-width: 768px) — NAV LAYOUT ALL-CENTERED and horizontal nav rules */
@media (min-width: 768px) {
  html, body { overflow-x: hidden; }
  /* Container centering / width at tablet */
  .container { max-width: 960px; padding: 0 1.5rem; margin: 0 auto; }

  /* Hamburger hidden, nav visible and centered */
  .nav-toggle-label { display: none !important; }

  /* Tablet+ header nav layout */
  .site-header .container { justify-content: center; gap: 2rem; }

  .site-nav { display: flex; align-items: center; justify-content: center; position: static; width: auto; background: transparent; border: none; box-shadow: none; }
  .nav-list { flex-direction: row !important; flex-wrap: nowrap; align-items: center; justify-content: center; padding: 0; margin: 0; }
  .nav-link { font-size: var(--font-size-sm); padding: 0.5rem 0.75rem; }

  /* Dropdown hover stays functional on tablet/desktop */
  .nav-dropdown-menu { left: 0; }

  /* Hero adjustments for tablet/desktop */
  .hero { padding: 3rem 0; }
  .hero-inner { gap: 2.5rem; }
  .hero-text { flex: 1 1 55%; }
  .hero-media { flex: 1 1 40%; }

  /* Card grid on tablet/desktop */
  .card-grid { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }

  /* Footer layout for larger screens */
  .footer-inner { padding: 0; }

  /* NAV dropdown behavior on tablet/desktop still uses hover/focus-within to reveal */
  .nav-dropdown-menu { min-width: 200px; }

  /* Centered container alignment in layout */
  .container { margin: 0 auto; }
}

/* Desktop (min-width: 1024px) — additional width, hero, section padding */
@media (min-width: 1024px) {
  .container { max-width: 1200px; padding: 0 2rem; }
  .hero { min-height: 70vh; }
  .hero h1 { font-size: var(--font-size-hero); }
  .section { padding: 4rem 0; }
  .section-title { font-size: var(--font-size-2xl); }
  .site-footer { padding: 2rem 0; }
}