/* ============================================
   World Data Foundation — Landing Page Styles
   ============================================ */

/* --- Navbar --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 16px 0;
  transition: background-color var(--transition), padding var(--transition), box-shadow var(--transition);
}

.navbar.scrolled {
  background-color: var(--color-navy);
  padding: 10px 0;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.nav-logo img {
  width: 44px;
  height: 44px;
  border-radius: 4px;
}

.nav-logo span {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: 0.5px;
}

.nav-links {
  display: none;
  gap: 32px;
}

.nav-links a {
  color: var(--color-silver);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  transition: color var(--transition);
}

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

.hamburger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-white);
  transition: transform var(--transition), opacity var(--transition);
}

.hamburger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile menu */
.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background-color: rgba(6, 15, 34, 0.97);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 32px;
}

.mobile-menu.active {
  display: flex;
}

.mobile-menu a {
  color: var(--color-white);
  font-family: var(--font-heading);
  font-size: 1.5rem;
  letter-spacing: 1px;
  transition: color var(--transition);
}

.mobile-menu a:hover {
  color: var(--color-accent);
}

@media (min-width: 768px) {
  .nav-links {
    display: flex;
  }

  .hamburger {
    display: none;
  }
}

/* --- Hero --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-navy);
  text-align: center;
  padding: 120px 24px 80px;
}

.hero-content {
  max-width: 800px;
}

.hero-logo {
  width: 200px;
  height: 200px;
  margin: 0 auto 40px;
  border-radius: 12px;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: 3px;
  margin-bottom: 16px;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--color-silver);
  letter-spacing: 1px;
  margin-bottom: 32px;
}

.hero-line {
  width: 80px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-silver), transparent);
  margin: 0 auto 40px;
}

.btn-primary {
  display: inline-block;
  padding: 14px 40px;
  background-color: var(--color-accent);
  color: var(--color-white);
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  border-radius: 4px;
  transition: background-color var(--transition), transform var(--transition);
}

.btn-primary:hover {
  background-color: var(--color-accent-hover);
  color: var(--color-white);
  transform: translateY(-2px);
}

@media (min-width: 768px) {
  .hero-logo {
    width: 300px;
    height: 300px;
  }

  .hero-title {
    font-size: 2.75rem;
    letter-spacing: 5px;
  }

  .hero-subtitle {
    font-size: 1.25rem;
  }
}

@media (min-width: 1024px) {
  .hero-logo {
    width: 400px;
    height: 400px;
  }

  .hero-title {
    font-size: 3.25rem;
    letter-spacing: 6px;
  }
}

/* --- Mission --- */
.mission {
  background-color: var(--color-white);
}

.mission-text {
  text-align: center;
  font-size: 1.125rem;
  color: var(--color-text-light);
  max-width: 800px;
  margin: 0 auto 56px;
  line-height: 1.8;
}

.mission-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.mission-card {
  text-align: center;
  padding: 40px 24px;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  transition: transform var(--transition), box-shadow var(--transition);
}

.mission-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(10, 26, 58, 0.08);
}

.mission-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 20px;
  color: var(--color-accent);
}

.mission-card h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
}

.mission-card p {
  color: var(--color-text-light);
  font-size: 0.9375rem;
}

@media (min-width: 768px) {
  .mission-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* --- Pillars --- */
.pillars {
  background-color: var(--color-grey-bg);
}

.pillars-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.pillar-card {
  background-color: var(--color-white);
  padding: 40px 28px;
  border-radius: 8px;
  border-left: 4px solid var(--color-accent);
  transition: transform var(--transition), box-shadow var(--transition);
}

.pillar-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(10, 26, 58, 0.1);
}

.pillar-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 20px;
  color: var(--color-accent);
}

.pillar-card h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
}

.pillar-card p {
  color: var(--color-text-light);
  font-size: 0.9375rem;
}

@media (min-width: 768px) {
  .pillars-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .pillars-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* --- Services --- */
.services {
  background-color: var(--color-white);
}

.service-item {
  display: flex;
  flex-direction: column;
  gap: 32px;
  margin-bottom: 64px;
  align-items: center;
}

.service-item:last-child {
  margin-bottom: 0;
}

.service-content {
  flex: 1;
}

.service-content h3 {
  font-size: 1.375rem;
  margin-bottom: 16px;
}

.service-content p {
  color: var(--color-text-light);
  font-size: 1rem;
  line-height: 1.8;
}

.service-visual {
  flex: 1;
  width: 100%;
  min-height: 200px;
  background-color: var(--color-grey-bg);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
}

.service-visual svg {
  width: 80px;
  height: 80px;
  color: var(--color-accent);
  opacity: 0.6;
}

@media (min-width: 768px) {
  .service-item {
    flex-direction: row;
    gap: 48px;
  }

  .service-item:nth-child(even) {
    flex-direction: row-reverse;
  }

  .service-visual {
    min-height: 260px;
  }
}

@media (min-width: 1024px) {
  .service-item {
    gap: 64px;
  }
}

/* --- Standards --- */
.standards {
  background-color: var(--color-navy);
  color: var(--color-white);
}

.standards .section-title {
  color: var(--color-white);
}

.standards .section-subtitle {
  color: var(--color-silver);
}

.standards-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  max-width: 900px;
  margin: 0 auto;
}

.standard-item {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  padding: 24px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: border-color var(--transition), background-color var(--transition);
}

.standard-item:hover {
  border-color: rgba(74, 144, 217, 0.4);
  background-color: rgba(255, 255, 255, 0.03);
}

.standard-number {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  min-width: 40px;
}

.standard-item h3 {
  color: var(--color-white);
  font-size: 1.125rem;
  margin-bottom: 8px;
}

.standard-item p {
  color: var(--color-silver);
  font-size: 0.9375rem;
}

@media (min-width: 768px) {
  .standard-item {
    padding: 32px;
  }
}

/* --- About --- */
.about {
  background-color: var(--color-grey-bg);
}

.about-text {
  text-align: center;
  font-size: 1.125rem;
  color: var(--color-text-light);
  max-width: 800px;
  margin: 0 auto 56px;
  line-height: 1.8;
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.stat-card {
  text-align: center;
  padding: 40px 24px;
  background-color: var(--color-white);
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(10, 26, 58, 0.06);
}

.stat-value {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: 8px;
}

.stat-label {
  color: var(--color-text-light);
  font-size: 0.9375rem;
}

@media (min-width: 768px) {
  .about-stats {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* --- Footer --- */
.footer {
  background-color: var(--color-navy-dark);
  padding: 64px 0 32px;
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand p {
  color: var(--color-silver);
  font-size: 0.9375rem;
  margin-top: 16px;
  max-width: 360px;
  line-height: 1.7;
}

.footer-brand .nav-logo {
  margin-bottom: 4px;
}

.footer-heading {
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--color-white);
  margin-bottom: 20px;
}

.footer-links a {
  display: block;
  color: var(--color-silver);
  font-size: 0.9375rem;
  padding: 4px 0;
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--color-white);
}

.footer-contact a {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-silver);
  font-size: 0.9375rem;
  padding: 4px 0;
  transition: color var(--transition);
}

.footer-contact a:hover {
  color: var(--color-white);
}

.footer-contact svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  color: var(--color-silver);
  font-size: 0.8125rem;
}

@media (min-width: 768px) {
  .footer-content {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

/* --- Scroll Reveal --- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}