/* Google Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Plus+Jakarta+Sans:wght@500;600;700;800&display=swap');

:root {
  --bg-primary: #111317;        /* Obsidian / Primary Canvas */
  --bg-secondary: #1A1D24;      /* Elevated Charcoal / Secondary Surface */
  --bg-tertiary: #222731;       /* Soft Slate / Occasional Surface */
  --text-primary: #F3F4F6;     /* Off-White / Primary Text */
  --text-secondary: #A4ACB9;   /* Cool Slate / Secondary Text */
  --accent-cyan: #38BDF8;       /* Precision Cyan / Accent */
  --accent-cyan-hover: #0EA5E9;
  --border-color: #282D37;      /* Subtle Border */
  --bg-light: #F8F9FB;          /* Light Canvas */
  --font-heading: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

/* Reset & Core Setup */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Typography Hierarchy */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.25rem, 5vw, 3.75rem); /* 36px to 60px */
  font-weight: 800;
}

h2 {
  font-size: clamp(1.75rem, 3.5vw, 2.75rem); /* 28px to 44px */
}

h3 {
  font-size: clamp(1.25rem, 2.5vw, 1.75rem); /* 20px to 28px */
}

p {
  color: var(--text-secondary);
  font-size: 1.0625rem; /* 17px */
  line-height: 1.7;
}

/* Base Links & Buttons */
a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

a:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 3px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--accent-cyan);
  color: #0F172A;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.875rem 1.75rem;
  border-radius: 6px;
  transition: background-color 0.2s ease, transform 0.15s ease;
  cursor: pointer;
  border: none;
  text-align: center;
  white-space: nowrap;
}

.btn-primary:hover {
  background-color: var(--accent-cyan-hover);
  transform: translateY(-1px);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.875rem 1.75rem;
  border-radius: 6px;
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
  cursor: pointer;
  text-align: center;
  white-space: nowrap;
}

.btn-secondary:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  background-color: rgba(56, 189, 248, 0.04);
}

.link-cyan {
  color: var(--accent-cyan);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
}

.link-cyan:hover {
  color: var(--accent-cyan-hover);
  text-decoration: underline;
}

/* Navigation Header */
.header-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(17, 19, 23, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
}

.header-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo Sizing Sizing Enhancement */
.brand-logo-img {
  height: 55px;
  width: auto;
  display: block;
  object-fit: contain;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2.25rem;
  list-style: none;
}

.nav-link {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  font-weight: 500;
  position: relative;
  padding: 0.25rem 0;
}

.nav-link:hover, .nav-link.active {
  color: var(--text-primary);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--accent-cyan);
}

/* Mobile Nav Drawer */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: 0.5rem;
}

.mobile-nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background-color: rgba(17, 19, 23, 0.98);
  z-index: 100;
  flex-direction: column;
  padding: 2rem 1.5rem;
}

.mobile-nav-overlay.open {
  display: flex;
}

.mobile-nav-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 3rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1rem;
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
  list-style: none;
  margin-bottom: 2.5rem;
}

.mobile-nav-link {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.mobile-nav-link.active, .mobile-nav-link:hover {
  color: var(--accent-cyan);
}

/* Layout & Surface Rules */
.site-container {
  max-width: 1280px;
  margin: 0 auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
  width: 100%;
}

.section-spacing {
  padding-top: 6rem;
  padding-bottom: 6rem;
}

.section-spacing-lg {
  padding-top: 7.5rem;
  padding-bottom: 7.5rem;
}

.border-divider {
  border-bottom: 1px solid var(--border-color);
}

/* Editorial Progression Styling */
.number-editorial {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.125rem;
  color: var(--accent-cyan);
  margin-bottom: 0.75rem;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-primary);
  padding-top: 4.5rem;
  padding-bottom: 3.5rem;
  margin-top: auto;
}

/* Responsive Overrides */
@media (max-width: 768px) {
  .nav-links, .header-cta {
    display: none;
  }
  
  .mobile-menu-btn {
    display: block;
  }

  .brand-logo-img {
    height: 36px;
  }

  .section-spacing {
    padding-top: 4rem;
    padding-bottom: 4rem;
  }

  .section-spacing-lg {
    padding-top: 4.5rem;
    padding-bottom: 4.5rem;
  }
}