/* ===== RESET ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Open Sans', Arial, sans-serif;
  font-size: 14px;
  line-height: 1.7;
  color: #666;
  -webkit-font-smoothing: antialiased;
  background: #000;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; height: auto; display: block; }

/* ===== HEADER ===== */
#main-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: rgba(10, 10, 10, 0.3);
  transition: background-color 0.4s ease;
}
#main-header.scrolled {
  background-color: rgba(10, 10, 10, 0.22);
}
.header-container {
  max-width: 1080px;
  width: 80%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 66px;
}
.logo_container a {
  display: flex;
  align-items: center;
}
.logo_container img {
  height: 50px;
  width: auto;
}
#top-menu {
  display: flex;
  gap: 28px;
}
#top-menu a {
  font-size: 14px;
  color: #fff;
  transition: opacity 0.3s;
}
#top-menu a:hover {
  opacity: 0.7;
}
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 5px;
}
.mobile-menu-toggle span {
  width: 24px;
  height: 2px;
  background: #fff;
  transition: 0.3s;
}
.mobile-menu {
  display: none;
  position: absolute;
  top: 66px;
  left: 0;
  width: 100%;
  background-color: rgba(10, 10, 10, 0.9);
  padding: 20px 0;
}
.mobile-menu.open {
  display: block;
}
.mobile-menu a {
  display: block;
  padding: 12px 30px;
  color: #fff;
  font-size: 14px;
}
.mobile-menu a:hover {
  background: rgba(255,255,255,0.1);
}

/* ===== FOOTER ===== */
.site-footer {
  background-color: #000;
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 30px 0;
}
.footer-container {
  max-width: 1080px;
  width: 80%;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.footer-copyright {
  color: #e2e2e2;
  font-size: 14px;
}
.social-links {
  display: flex;
  gap: 14px;
}
.social-links a {
  width: 32px;
  height: 32px;
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 14px;
  transition: background 0.3s, border-color 0.3s;
}
.social-links a:hover {
  background: rgba(255,255,255,0.15);
  border-color: rgba(255,255,255,0.6);
}
.social-links svg {
  width: 14px;
  height: 14px;
  fill: #fff;
}

/* ===== PAGE HERO (used by about, methodology, contact) ===== */
.page-hero {
  background-color: #000;
  padding: 140px 0 60px;
}
.page-hero .container {
  max-width: 1080px;
  width: 80%;
  margin: 0 auto;
}
.page-hero h4 {
  font-family: 'Archivo', Helvetica, Arial, sans-serif;
  font-weight: 700;
  text-transform: uppercase;
  font-size: 14px;
  color: #fff;
  letter-spacing: 1px;
  line-height: 1.4;
  margin-bottom: 10px;
}
.page-hero h1 {
  font-family: 'Archivo', Helvetica, Arial, sans-serif;
  font-weight: 700;
  font-size: 72px;
  color: #fff;
  line-height: 1.2;
}

/* ===== COMMON SECTION CONTAINERS ===== */
.section-black {
  background-color: #000;
  padding: 54px 0;
}
.section-container {
  max-width: 1080px;
  width: 80%;
  margin: 0 auto;
}

/* ===== RESPONSIVE ===== */
@media only screen and (max-width: 980px) {
  .header-container, .footer-container, .section-container, .page-hero .container {
    width: 90%;
  }
  #top-menu {
    display: none;
  }
  .mobile-menu-toggle {
    display: flex;
  }
  .page-hero h1 {
    font-size: 40px;
  }
}
@media only screen and (max-width: 767px) {
  .page-hero h1 {
    font-size: 24px;
  }
  .footer-container {
    flex-direction: column;
    gap: 20px;
    text-align: center;
  }
}