/* ============================================================
   2DRK Lab — Main Stylesheet
   Brand: #0A192F / #0060C9 / #FFD100
   Font:  Source Sans 3
   ============================================================ */

/* ── CSS Variables ── */
:root {
  --clr-primary:    #0A192F;
  --clr-secondary:  #0060C9;
  --clr-accent:     #FFD100;
  --clr-dark:       #06132A;
  --clr-body:       #E8EDF3;
  --clr-muted:      #7A8FA6;
  --clr-white:      #FFFFFF;
  --clr-border:     rgba(255,255,255,0.08);

  --font-main:      'Plus Jakarta Sans', sans-serif;

  --fs-h1:          56px;
  --fs-h2:          36px;
  --fs-h3:          24px;
  --fs-body:        18px;
  --fs-sub:         16px;
  --fs-small:       14px;

  --lh-h1:          84px;
  --lh-h2:          54px;
  --lh-h3:          36px;
  --lh-body:        27px;
  --lh-sub:         24px;

  --radius:         4px;
  --radius-sm:      2px;
  --radius-md:      4px;

  --header-h:       68px;
  --transition:     0.2s ease;
  --max-w:          1200px;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-main);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--clr-body);
  background: var(--clr-primary);
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* ── Page Wrap ── */
.page-wrap { min-height: calc(100vh - var(--header-h)); }

/* ============================================================
   TYPOGRAPHY
   ============================================================ */
h1 {
  font-size: var(--fs-h1);
  font-weight: 800;
  line-height: 1.05;
  color: var(--clr-white);
  letter-spacing: -1px;
}
h2 {
  font-size: var(--fs-h2);
  font-weight: 700;
  line-height: var(--lh-h2);
  color: var(--clr-white);
}
h3 {
  font-size: var(--fs-h3);
  font-weight: 600;
  line-height: var(--lh-h3);
  color: var(--clr-white);
}
p {
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--clr-body);
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn-audit {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--clr-accent);
  color: var(--clr-primary);
  font-family: var(--font-main);
  font-size: var(--fs-sub);
  font-weight: 700;
  line-height: 1;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  transition: background var(--transition), transform var(--transition);
  white-space: nowrap;
}
.btn-audit:hover {
  background: #e6bc00;
  transform: translateY(-1px);
}
.btn-arrow { transition: transform var(--transition); }
.btn-audit:hover .btn-arrow { transform: translateX(3px); }

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--clr-secondary);
  color: var(--clr-white);
  font-family: var(--font-main);
  font-size: var(--fs-sub);
  font-weight: 700;
  padding: 12px 24px;
  border-radius: var(--radius);
  transition: background var(--transition), transform var(--transition);
}
.btn-primary:hover { background: #0052a8; transform: translateY(-1px); }

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  color: var(--clr-white);
  font-family: var(--font-main);
  font-size: var(--fs-sub);
  font-weight: 600;
  padding: 11px 23px;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  transition: border-color var(--transition), color var(--transition);
}
.btn-outline:hover { border-color: var(--clr-secondary); color: var(--clr-secondary); }

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-h);
  background: var(--clr-primary);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), backdrop-filter var(--transition), background var(--transition);
}
.site-header.scrolled {
  border-bottom-color: var(--clr-border);
  backdrop-filter: blur(12px);
  background: rgba(10, 25, 47, 0.92);
}

.header-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 32px;
}

/* ── Logo ── */
.site-logo {
  display: flex;
  align-items: baseline;
  gap: 3px;
  flex-shrink: 0;
}
.logo-2drk {
  font-size: 22px;
  font-weight: 800;
  color: var(--clr-white);
  letter-spacing: -0.5px;
  line-height: 1;
}
.logo-lab {
  font-size: 22px;
  font-weight: 300;
  color: var(--clr-secondary);
  letter-spacing: 1px;
  line-height: 1;
}

/* ── Primary Nav ── */
.primary-nav { margin-left: auto; }
.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-item { position: relative; }
.nav-link {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 12px;
  font-size: var(--fs-sub);
  font-weight: 600;
  color: var(--clr-body);
  border-radius: var(--radius);
  transition: color var(--transition), background var(--transition);
}
.nav-link:hover { color: var(--clr-white); background: rgba(255,255,255,0.05); }
.nav-arrow {
  font-size: 12px;
  transition: transform var(--transition);
  display: inline-block;
}
.nav-item:hover .nav-arrow { transform: rotate(180deg); }

/* Dropdown */
.dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  background: #0D2137;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  min-width: 210px;
  padding: 6px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}
.nav-item:hover .dropdown,
.nav-item:focus-within .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.dropdown li a {
  display: block;
  padding: 9px 14px;
  font-size: var(--fs-sub);
  font-weight: 400;
  color: var(--clr-body);
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}
.dropdown li a:hover {
  color: var(--clr-white);
  background: rgba(0, 96, 201, 0.15);
}

/* ── Hamburger ── */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 6px;
  margin-left: auto;
  border-radius: var(--radius-sm);
}
.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--clr-body);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================================
   MOBILE DRAWER
   ============================================================ */
.mobile-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(6,19,42,0.7);
  backdrop-filter: blur(4px);
  z-index: 1100;
  opacity: 0;
  transition: opacity var(--transition);
}
.mobile-overlay.open { opacity: 1; }

.mobile-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 300px;
  max-width: 90vw;
  background: var(--clr-dark);
  border-left: 1px solid var(--clr-border);
  z-index: 1200;
  transform: translateX(100%);
  transition: transform 0.3s ease;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}
.mobile-drawer.open { transform: translateX(0); }

.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 20px 16px;
  border-bottom: 1px solid var(--clr-border);
}
.drawer-close {
  font-size: 18px;
  color: var(--clr-muted);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: color var(--transition);
}
.drawer-close:hover { color: var(--clr-white); }

.drawer-nav { padding: 16px 20px 24px; flex: 1; display: flex; flex-direction: column; }
.drawer-list { flex: 1; }
.drawer-item > a {
  display: block;
  padding: 12px 0;
  font-size: var(--fs-body);
  font-weight: 600;
  color: var(--clr-body);
  border-bottom: 1px solid var(--clr-border);
  transition: color var(--transition);
}
.drawer-item > a:hover { color: var(--clr-white); }
.drawer-sub {
  padding: 6px 0 6px 12px;
}
.drawer-sub li a {
  display: block;
  padding: 7px 0;
  font-size: var(--fs-sub);
  color: var(--clr-muted);
  transition: color var(--transition);
}
.drawer-sub li a:hover { color: var(--clr-body); }
.drawer-cta { margin-top: 24px; width: 100%; justify-content: center; font-size: var(--fs-body); }

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  background: var(--clr-dark);
  border-top: 1px solid var(--clr-border);
  padding: 64px 0 0;
  margin-top: 80px;
}
.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

/* Footer top grid */
.footer-top {
  display: grid;
  grid-template-columns: 1.8fr 1fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--clr-border);
}

.footer-logo { margin-bottom: 14px; }
.footer-tagline {
  font-size: var(--fs-sub);
  color: var(--clr-muted);
  line-height: var(--lh-sub);
  margin-bottom: 20px;
}

.footer-socials { display: flex; gap: 10px; }
.social-link {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-sm);
  color: var(--clr-muted);
  transition: border-color var(--transition), color var(--transition), background var(--transition);
}
.social-link:hover {
  border-color: var(--clr-secondary);
  color: var(--clr-white);
  background: rgba(0,96,201,0.1);
}

.footer-heading {
  font-size: var(--fs-sub);
  font-weight: 700;
  color: var(--clr-white);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 16px;
}
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a {
  font-size: var(--fs-sub);
  color: var(--clr-muted);
  transition: color var(--transition);
}
.footer-links a:hover { color: var(--clr-body); }

/* Footer bottom */
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0;
}
.footer-copy { font-size: var(--fs-small); color: var(--clr-muted); }
.footer-email {
  font-size: var(--fs-small);
  color: var(--clr-muted);
  transition: color var(--transition);
}
.footer-email:hover { color: var(--clr-secondary); }

/* ============================================================
   UTILITY
   ============================================================ */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}
.section { padding: 80px 0; }
.section-label {
  display: inline-block;
  font-size: var(--fs-small);
  font-weight: 700;
  color: var(--clr-secondary);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 12px;
}
.text-accent { color: var(--clr-accent); }
.text-blue   { color: var(--clr-secondary); }
.text-muted  { color: var(--clr-muted); }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  :root { --fs-h1: 44px; --lh-h1: 60px; }
  .footer-top { grid-template-columns: 1fr 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 768px) {
  :root {
    --fs-h1: 34px; --lh-h1: 48px;
    --fs-h2: 28px; --lh-h2: 42px;
    --fs-h3: 20px; --lh-h3: 30px;
    --fs-body: 16px; --lh-body: 24px;
  }

  .primary-nav { display: none; }
  .btn-audit:not(.drawer-cta) { display: none; }
  .hamburger { display: flex; }

  .footer-top { grid-template-columns: 1fr 1fr; gap: 32px; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
}

@media (max-width: 480px) {
  .footer-top { grid-template-columns: 1fr; }
  .section { padding: 56px 0; }
}