:root {
  /* Colors from Brand Context */
  --primary: #0A0A0A; /* Deep Clinical Black */
  --secondary: #E0E0E0; /* Sharp Gray */
  --accent: #00E5FF; /* Electric Cyan / "Logic Leak" Highlighter */
  --neutral: #FFFFFF; /* White */
  --dark-gray: #1a1a1a;
  --mid-gray: #333333;

  /* Type Scale */
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-serif: 'Source Serif 4', 'Georgia', serif;

  /* Spacing Scale (Dense: smaller padding) */
  --space-4: 4px;
  --space-8: 8px;
  --space-16: 16px;
  --space-24: 24px;
  --space-32: 32px;
  --space-48: 48px;
  --space-64: 64px;
}

/* Reset */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-serif);
  background-color: var(--primary);
  color: var(--secondary);
  line-height: 1.6;
  overflow-wrap: break-word;
  word-wrap: break-word;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  color: var(--neutral);
  line-height: 1.1;
  margin-bottom: var(--space-16);
  font-weight: 600;
}

h1 { font-size: 2.5rem; letter-spacing: -0.02em; }
@media (min-width: 768px) { h1 { font-size: 4rem; } }
h2 { font-size: 2rem; letter-spacing: -0.01em; }
@media (min-width: 768px) { h2 { font-size: 3rem; } }
h3 { font-size: 1.5rem; }
p { margin-bottom: var(--space-16); }

.text-accent { color: var(--accent); }
.text-sans { font-family: var(--font-sans); }

/* Layout: Magazine Editorial */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-24);
}

.editorial-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-48);
  align-items: start;
}
@media (min-width: 768px) {
  .editorial-layout { grid-template-columns: 4fr 8fr; gap: var(--space-64); }
}
.editorial-layout.reverse {
  direction: rtl;
}
.editorial-layout.reverse > * {
  direction: ltr;
}

/* Color Block Sections */
section {
  padding: 48px 0; /* Dense padding */
}
section.block-primary { background-color: var(--primary); color: var(--secondary); }
section.block-primary h1, section.block-primary h2, section.block-primary h3, section.block-primary h4 { color: var(--neutral); }

section.block-secondary { background-color: var(--secondary); color: var(--primary); }
section.block-secondary h1, section.block-secondary h2, section.block-secondary h3, section.block-secondary h4 { color: var(--primary); }

section.block-neutral { background-color: var(--neutral); color: var(--primary); }
section.block-neutral h1, section.block-neutral h2, section.block-neutral h3, section.block-neutral h4 { color: var(--primary); }

section.block-accent { background-color: var(--accent); color: var(--primary); }
section.block-accent h1, section.block-accent h2, section.block-accent h3, section.block-accent h4 { color: var(--primary); }
section.block-accent .btn { border-color: var(--primary); color: var(--primary); }
section.block-accent .btn-primary { background-color: var(--primary); color: var(--accent); border-color: var(--primary); }
section.block-accent .btn-primary:hover, section.block-accent .btn-primary:focus { background-color: transparent; color: var(--primary); border-color: var(--primary); }

/* Header & Mobile Menu */
header {
  padding: var(--space-16) 0;
  background-color: var(--primary);
  border-bottom: 1px solid var(--mid-gray);
  position: relative;
  z-index: 100;
}
.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.logo img { height: 32px; width: auto; filter: invert(1); mix-blend-mode: screen; }
.nav-links {
  display: none; /* hidden on mobile, need hamburger or editorial alignment */
}
.nav-toggle {
  display: block;
  background: none;
  border: none;
  color: var(--accent);
  font-size: 1.5rem;
  cursor: pointer;
  font-family: var(--font-sans);
}
@media (min-width: 768px) {
  .nav-links {
    display: flex;
    gap: var(--space-24);
    align-items: center;
  }
  .nav-toggle { display: none; }
}
.nav-links a {
  color: var(--secondary);
  text-decoration: none;
  font-family: var(--font-sans);
  font-weight: 500;
  transition: color 0.2s;
}
.nav-links a:hover, .nav-links a:focus { color: var(--accent); }
.nav-links a.btn-primary { color: #0A0A0A; }

/* Mobile menu visible state */
#mobile-menu:target {
  display: flex;
  flex-direction: column;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--primary);
  padding: var(--space-24);
  border-bottom: 1px solid var(--mid-gray);
  gap: var(--space-16);
}

/* Buttons */
.btn {
  font-family: var(--font-sans);
  max-width: 100%;
  white-space: normal;
  text-align: center;
  display: inline-block;
  padding: 12px 24px;
  background-color: transparent;
  color: var(--accent);
  border: 2px solid var(--accent);
  text-decoration: none;
  font-weight: 600;
  border-radius: 0; /* sharper edges */
  transition: all 0.2s ease-in-out;
  cursor: pointer;
}
.btn:hover, .btn:focus {
  background-color: var(--accent);
  color: var(--primary);
  outline: none;
}
.btn-primary { background-color: var(--accent); color: var(--primary); border-color: var(--accent); }
.btn-primary:hover, .btn-primary:focus { background-color: var(--neutral); border-color: var(--neutral); color: var(--primary); }

/* Hero Section - Asymmetric */
.hero {
  position: relative;
  overflow: hidden;
}
.hero-asymmetric {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-48);
  align-items: center;
}
@media (min-width: 768px) {
  .hero-asymmetric {
    display: block;
    position: relative;
    padding: 80px 0;
  }
  .hero-text-block {
    max-width: 65%;
    position: relative;
    z-index: 2;
    transform: rotate(-1deg) translateX(-10px);
  }
  .hero-visual-block {
    max-width: 60%;
    position: absolute;
    right: -5%;
    top: 50%;
    transform: translateY(-50%) rotate(2deg) translate(20px, 40px);
    z-index: 1;
  }
}
.hero-text-block {
  transform-origin: left center;
}
.hero-visual-block {
  position: relative;
}
.hero p.subheadline {
  font-size: 1.25rem;
  margin-bottom: var(--space-32);
}
.hero-visual {
  max-width: 100%;
  border: 2px solid var(--primary);
  box-shadow: -15px 15px 0 var(--accent);
}

/* Grid Layouts */
.grid { display: grid; grid-template-columns: 1fr; gap: var(--space-32); }
@media (min-width: 768px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
}

/* Features/Pillars */
.feature-card {
  padding: var(--space-24) 0;
  border-top: 2px solid var(--primary);
}
.block-primary .feature-card { border-top-color: var(--mid-gray); }

.feature-card h3 {
  margin-top: var(--space-16);
  color: inherit;
}

/* Pricing */
.pricing-card {
  background-color: var(--primary);
  border: 1px solid var(--mid-gray);
  padding: var(--space-48);
  border-radius: 0;
  color: var(--secondary);
}
.block-primary .pricing-card {
  background-color: var(--dark-gray);
}
.pricing-card h3 { color: var(--neutral); }

.pricing-card.popular {
  border-color: var(--accent);
  position: relative;
  margin-top: var(--space-32);
  margin-bottom: var(--space-32);
}
@media (min-width: 768px) {
  .pricing-card.popular {
    transform: scale(1.05);
    margin-top: 0;
    margin-bottom: 0;
    z-index: 1;
  }
}
.popular-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--accent);
  color: #0A0A0A;
  padding: 4px 12px;
  font-size: 0.875rem;
  font-weight: bold;
  font-family: var(--font-sans);
}
.price {
  font-family: var(--font-sans);
  font-size: 3rem;
  color: var(--neutral);
  font-weight: bold;
  margin: var(--space-24) 0;
}
.pricing-features {
  list-style: none;
  margin: var(--space-32) 0;
  text-align: left;
}
.pricing-features li {
  margin-bottom: var(--space-16);
  padding-left: var(--space-24);
  position: relative;
  font-family: var(--font-serif);
}
.pricing-features li::before {
  content: '✓';
  color: var(--accent);
  position: absolute;
  left: 0;
  font-family: var(--font-sans);
}

/* FAQ */
.faq-item {
  margin-bottom: var(--space-32);
  border-top: 1px solid var(--primary);
  padding-top: var(--space-16);
}
.block-primary .faq-item { border-top-color: var(--mid-gray); }

/* Testimonials */
.testimonial-block {
  border-left: 4px solid var(--accent);
  padding-left: var(--space-24);
  font-size: 1.25rem;
  font-style: italic;
  margin: var(--space-32) 0;
}
.testimonial-author {
  display: flex;
  align-items: center;
  gap: var(--space-16);
  margin-top: var(--space-24);
  font-style: normal;
}
.testimonial-author img {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  border: 2px solid var(--accent);
  object-fit: cover;
}

/* Footer */
footer {
  background-color: var(--primary);
  padding: var(--space-64) 0 var(--space-32);
  border-top: 1px solid var(--mid-gray);
  color: var(--secondary);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-32);
  margin-bottom: var(--space-48);
}
@media (min-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
.footer-col h4 { color: var(--neutral); font-family: var(--font-sans); }
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: var(--space-8); font-family: var(--font-sans); }
.footer-col a { color: var(--secondary); text-decoration: none; }
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
  text-align: center;
  border-top: 1px solid var(--mid-gray);
  padding-top: var(--space-32);
  font-size: 0.875rem;
  font-family: var(--font-sans);
}

/* Skip Link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--accent);
  color: var(--primary);
  padding: 8px;
  z-index: 101;
  transition: top 0.2s;
  font-family: var(--font-sans);
}
.skip-link:focus { top: 0; }
img { max-width: 100%; height: auto; }