:root {
  --ink: #111;
  --muted: #6b7c6f;
  --muted-ink: #f4f7f4;
  --ring: #123c66; /* deep blue */
  --accent: #ef7d1a; /* orange */
  --bg: #ffffff;
  --shadow: 0 8px 24px rgba(17, 24, 39, .06);
  --header-h: 72px; /* keep in sync with home.css */
}

/* ==== Fixed header (desktop + mobile) ==== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1001;
  background: var(--bg);
  height: var(--header-h);
  display: flex;
  align-items: center;
  border-bottom: 1px solid rgba(17, 24, 39, .05);
  box-shadow: var(--shadow);
}

.nav-wrap {
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  align-items: center;
  gap: 16px;
}

/* Brand */
.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
}

.brand img {
  height: 36px;
  width: auto;
  display: block;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, .08));
}

.brand-text {
  font-size: .7rem;
  letter-spacing: .18em;
  color: #6b7280;
  text-transform: uppercase;
  white-space: nowrap;
}

/* Inline nav (desktop) */
.main-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 28px;
  flex-wrap: nowrap;
}

.nav-link {
  position: relative;
  text-decoration: none;
  color: var(--ink);
  font-size: 1.05rem;
  font-weight: 500;
  padding: 6px 0;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -10px;
  height: 2px;
  background: linear-gradient(90deg, var(--ring), var(--accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: .25s ease;
  border-radius: 2px;
}

.nav-link:hover::after,
.nav-link.active::after {
  transform: scaleX(1);
}

/* CTA */
.cta {
  display: flex;
  align-items: center;
  justify-self: end;
}

.btn {
  --btn-shadow: 0 6px 16px rgba(18, 60, 102, .18);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 9px 16px;
  border-radius: 14px;
  font-size: .92rem;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: .02em;
  border: 2px solid transparent;
  color: #fff;
  background: linear-gradient(90deg, var(--ring), var(--accent));
  box-shadow: var(--btn-shadow);
  transition: transform .12s ease, box-shadow .2s ease, filter .2s ease;
  white-space: nowrap;
}

/* Hamburger – hidden by default (desktop) */
.hamburger {
  display: none;
  width: 40px;
  height: 40px;
  padding: 0;
  border: none;
  background: transparent;
  border-radius: 10px;
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: .2s;
}

/* X animation when open */
.site-header.open .hamburger span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.site-header.open .hamburger span:nth-child(2) {
  opacity: 0;
}

.site-header.open .hamburger span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* ===== Dropdown Styles ===== */
.nav-item {
  position: relative;
}

.dropdown-menu {
  display: none;
  position: absolute;
  background: var(--bg);
  min-width: 200px;
  top: 100%;
  left: 0;
  border-radius: 8px;
  box-shadow: var(--shadow);
  z-index: 1000;
  padding: 8px 0;
}

.dropdown-menu a {
  position: relative;
  display: block;
  padding: 10px 16px;
  text-decoration: none;
  color: var(--ink);
  font-size: 0.95rem;
  white-space: nowrap;
  transition: background 0.25s ease, color 0.25s ease;
}

.dropdown-menu a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 6px;
  height: 2px;
  background: linear-gradient(90deg, var(--ring), var(--accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
  border-radius: 2px;
}

.dropdown-menu a:hover {
  background: var(--bg-alt);
  color: var(--ring);
}

.dropdown-menu a:hover::after {
  transform: scaleX(1);
}

/* Hover on desktop shows dropdown */
@media (min-width: 901px) {
  .nav-item:hover .dropdown-menu {
    display: block;
  }
  /* About Us main link hover underline */
  .nav-item.dropdown > .nav-link::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: -10px;
    height: 2px;
    background: linear-gradient(90deg, var(--ring), var(--accent));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.25s ease;
    border-radius: 2px;
  }
  .nav-item.dropdown:hover > .nav-link::after,
  .nav-item.dropdown > .nav-link.active::after {
    transform: scaleX(1);
  }
}

/* Mobile open state */
@media (max-width: 900px) {
  .main-nav { display:none; }
  .hamburger { display:flex; }
  .site-header.open .main-nav {
    display:flex !important;
    position:fixed;
    top:var(--header-h); left:0; right:0; bottom:0;
    flex-direction:column;
    justify-content:center;
    align-items:center;
    gap:24px;
    padding:28px 24px;
    background:rgba(255,255,255,.96);
    backdrop-filter:saturate(1.1) blur(4px);
    border-top:1px solid rgba(17,24,39,.06);
    box-shadow:0 10px 24px rgba(0,0,0,.08);
    z-index:9999;
    overflow:auto;
  }
  .site-header.open .main-nav .nav-link {
    font-size:1.35rem;
    font-weight:600;
    line-height:1.5;
    padding:12px 8px;
    text-align:center;
    width:100%;
    max-width:520px;
  }
  .site-header.open .main-nav .nav-link::after { display:none; }
  .site-header.open .main-nav .nav-link:hover {
    background:rgba(0,0,0,.04);
    border-radius:12px;
  }
  .dropdown-menu {
    position: static;
    box-shadow: none;
    padding-left: 16px;
  }
  .nav-item.open .dropdown-menu {
    display: block;
  }
}

/* ===== Very small screens (<640px) ===== */
@media (max-width:640px){
  :root{ --header-h:64px; }
  .brand-text{ display:none; }
}

/* lock page scroll when menu is open */
body.menu-open { overflow:hidden; }

/* Mobile header larger */
@media (max-width:900px){
  :root{ --header-h: 84px; }
  .site-header{ height: var(--header-h); }
  body{ padding-top: var(--header-h); }
  .nav-wrap{ padding: 0 20px; }
  .brand img{ height: 42px; }
  .hamburger{
    width: 48px;
    height: 48px;
    border-radius: 12px;
  }
  .hamburger span{
    width: 28px;
    height: 3px;
  }
  .cta .btn{
    padding: 10px 18px;
    border-radius: 16px;
    font-size: 0.98rem;
    box-shadow: 0 8px 20px rgba(18,60,102,.20);
  }
}

/* Extra-small phones */
@media (max-width:430px){
  :root{ --header-h: 76px; }
  .site-header{ height: var(--header-h); }
  body{ padding-top: var(--header-h); }
}

/* show a white border on all primary buttons */
.btn-primary{
  border-color:#fff;          /* make border visible */
  border-width:3px;           /* match navbar thickness */
  background-clip:padding-box;
  -webkit-background-clip:padding-box; /* Safari */
}
.btn-primary:hover{ border-color:#fff; } /* keep on hover */