/* ===========================
   Grey Matter Dynamics
   Black/white dramatic theme
   =========================== */

:root {
  --black: #0a0a0a;
  --white: #f5f5f5;
  --gray-100: #e5e5e5;
  --gray-200: #d4d4d4;
  --gray-400: #737373;
  --gray-600: #404040;
  --gray-800: #1a1a1a;
  --gray-900: #111111;
  --accent: #00d4aa;
  --accent-dim: rgba(0, 212, 170, 0.15);
  --accent-glow: rgba(0, 212, 170, 0.3);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  font-family: var(--font-sans);
  background: var(--black);
  color: var(--gray-200);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Container */
.container {
  max-width: 72rem;
  margin: 0 auto;
  padding: 0 2rem;
}

.container-narrow {
  max-width: 48rem;
}

/* Nav */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 10, 10, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--gray-800);
}

.nav-inner {
  max-width: 72rem;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

.nav-logo {
  font-weight: 700;
  font-size: 1rem;
  color: var(--white);
  text-decoration: none;
  letter-spacing: -0.02em;
}


.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-links a {
  color: var(--gray-400);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.2s;
}

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

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  flex-direction: column;
  gap: 5px;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--white);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: 4px;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
  font-family: var(--font-sans);
}

.btn-sm {
  padding: 0.5rem 1.25rem;
  font-size: 0.8125rem;
}

.btn-lg {
  padding: 1rem 2.5rem;
  font-size: 1rem;
}

.btn-primary {
  background: var(--accent);
  color: var(--black);
}

.btn-primary:hover {
  background: #00e8bb;
  transform: translateY(-1px);
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border: 1px solid var(--gray-600);
}

.btn-outline:hover {
  border-color: var(--white);
  transform: translateY(-1px);
}

.nav-links .btn {
  background: var(--accent);
  color: var(--black);
  border: none;
}

.nav-links .btn:hover {
  background: #00e8bb;
  color: var(--black);
}

/* Hero */
.hero {
  padding: 10rem 0 6rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 60rem;
  height: 60rem;
  background: radial-gradient(circle, var(--accent-dim) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
}

.hero > .container {
  position: relative;
  z-index: 1;
}

.hero-logo {
  display: block;
  width: min(30rem, 70vw);
  height: auto;
  margin: 0 auto -4rem;
  filter: brightness(0) invert(1);
  opacity: 0.9;
}

.hero-brand {
  font-size: 1.2em;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 2.5rem;
}

.hero-brand span {
  color: var(--accent);
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 700;
  color: var(--white);
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}

.hero-sub {
  font-size: 1.125rem;
  color: var(--gray-400);
  max-width: 40rem;
  margin: 0 auto 2.5rem;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* Page header (inner pages) */
.page-header {
  padding: 8rem 0 4rem;
  text-align: center;
}

.page-header h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  color: var(--white);
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
}

.page-header p {
  font-size: 1.125rem;
  color: var(--gray-400);
  max-width: 36rem;
  margin: 0 auto;
  line-height: 1.7;
}

/* Sections */
.section {
  padding: 6rem 0;
}

.section-dark {
  background: var(--gray-900);
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-header h2 {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.section-sub {
  font-size: 1.125rem;
  color: var(--gray-400);
  max-width: 36rem;
  margin: 0 auto;
}

.beta-badge {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.35rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 100px;
}

.section-cta {
  text-align: center;
  margin-top: 3rem;
}

/* Problem grid */
.problem-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.problem-card {
  padding: 2rem;
  border: 1px solid var(--gray-800);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.02);
}

.problem-icon {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--accent);
  margin-bottom: 1rem;
}

.problem-card h3 {
  font-size: 1.25rem;
  color: var(--white);
  margin-bottom: 0.75rem;
}

.problem-card p {
  color: var(--gray-400);
  font-size: 0.9375rem;
}

.card-solutions-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--gray-800);
}

.card-solutions {
  list-style: none;
}

.card-solutions li {
  padding: 0.35rem 0;
  padding-left: 1.5rem;
  position: relative;
  color: var(--gray-200);
  font-size: 0.875rem;
}

.card-solutions li::before {
  content: '\2192';
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* Approach */
.approach-lead {
  max-width: 48rem;
  margin: 0 auto 3rem;
  text-align: center;
  font-size: 1.25rem;
  color: var(--gray-200);
  line-height: 1.8;
}

.approach-lead em {
  color: var(--accent);
  font-style: normal;
  font-weight: 600;
}

.approach-pillars {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  max-width: 56rem;
  margin: 0 auto 3rem;
}

.approach-pillar {
  padding: 2rem;
  border: 1px solid var(--gray-800);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.02);
  border-top: 3px solid var(--accent);
}

.pillar-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 1rem;
}

.approach-pillar p {
  color: var(--gray-200);
  font-size: 0.9375rem;
  line-height: 1.7;
  margin: 0;
}

.approach-pillar em {
  color: var(--white);
  font-style: italic;
}

.approach-outcome {
  max-width: 48rem;
  margin: 0 auto 2.5rem;
  text-align: center;
}

.approach-outcome p {
  font-size: 1.0625rem;
  color: var(--gray-400);
  line-height: 1.8;
}

.approach-outcome em {
  color: var(--white);
  font-style: normal;
  font-weight: 600;
}

.approach-callout {
  max-width: 40rem;
  margin: 0 auto 3rem;
  padding: 2rem 2.5rem;
  background: var(--gray-900);
  border-radius: 8px;
  text-align: center;
  position: relative;
}

.callout-mark {
  display: block;
  font-size: 3rem;
  line-height: 1;
  color: var(--accent);
  margin-bottom: 0.5rem;
  font-family: Georgia, serif;
}

.approach-callout p {
  color: var(--white);
  font-size: 1.125rem;
  font-style: italic;
  line-height: 1.7;
  margin: 0;
}

.approach-label {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 2rem;
}

.approach-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

.approach-card {
  padding: 2rem;
  border: 1px solid var(--gray-800);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.02);
  border-top: 3px solid var(--accent);
}

.approach-number {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.approach-card h4 {
  font-size: 1.25rem;
  color: var(--white);
  margin-bottom: 0.75rem;
}

.approach-card p {
  color: var(--gray-400);
  font-size: 0.9375rem;
  line-height: 1.7;
}

.approach-philosophy {
  max-width: 48rem;
  margin: 0 auto;
  padding: 1.5rem;
  border-left: 3px solid var(--accent);
  background: var(--gray-900);
  border-radius: 0 8px 8px 0;
  text-align: left;
}

.approach-philosophy p {
  color: var(--gray-200);
  font-size: 0.9375rem;
  line-height: 1.7;
  margin: 0;
}

/* Check list */
.check-list {
  list-style: none;
}

.check-list li {
  padding: 0.5rem 0;
  padding-left: 1.5rem;
  position: relative;
  color: var(--gray-200);
  font-size: 0.9375rem;
}

.check-list li::before {
  content: '\2713';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 600;
}

/* Rebar section */
.rebar-intro {
  max-width: 48rem;
  margin: 0 auto 3rem;
  text-align: center;
  font-size: 1.0625rem;
  color: var(--gray-200);
}

.rebar-intro em {
  color: var(--accent);
  font-style: italic;
}

.rebar-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.rebar-card {
  padding: 2rem;
  border: 1px solid var(--gray-800);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.02);
  transition: border-color 0.2s;
}

.rebar-card:hover {
  border-color: var(--accent);
}

.rebar-card h4 {
  font-size: 1.0625rem;
  color: var(--white);
  margin-bottom: 0.75rem;
}

.rebar-card p {
  color: var(--gray-400);
  font-size: 0.9375rem;
}

/* Experience */
.experience-body p {
  color: var(--gray-200);
  font-size: 1.0625rem;
  line-height: 1.8;
  margin-bottom: 1.25rem;
}

.experience-cta {
  margin-top: 2rem;
  padding: 1.5rem;
  border-left: 3px solid var(--accent);
  background: var(--gray-900);
  border-radius: 0 8px 8px 0;
}

.experience-cta strong {
  color: var(--white);
}

/* Pricing */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.pricing-card {
  padding: 2.5rem 2rem;
  border: 1px solid var(--gray-800);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.02);
}

.pricing-card-featured {
  border-color: var(--accent);
  background: var(--accent-dim);
}

.pricing-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--gray-400);
  margin-bottom: 0.75rem;
}

.pricing-card h3 {
  font-size: 1.5rem;
  color: var(--white);
  margin-bottom: 0.5rem;
}

.pricing-card p {
  color: var(--gray-400);
  font-size: 0.9375rem;
  margin-bottom: 1.5rem;
}

/* Contact */
.contact-options {
  text-align: center;
}

.contact-address {
  margin-top: 1.5rem;
  color: var(--gray-400);
  font-size: 0.9375rem;
}

/* Footer */
.footer {
  padding: 3rem 0;
  border-top: 1px solid var(--gray-800);
  background: var(--black);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  color: var(--gray-400);
  font-size: 0.875rem;
}

.footer-note {
  color: var(--gray-600);
  font-size: 0.8125rem;
}

/* ===========================
   Responsive
   =========================== */

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 4rem;
    left: 0;
    right: 0;
    background: var(--gray-900);
    flex-direction: column;
    padding: 1.5rem 2rem;
    gap: 1rem;
    border-bottom: 1px solid var(--gray-800);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-toggle {
    display: flex;
  }

  .hero {
    padding: 8rem 0 4rem;
  }

  .hero-logo {
    margin: 0 auto -2rem;
  }

  .section {
    padding: 4rem 0;
  }

  .footer-inner {
    flex-direction: column;
    gap: 0.5rem;
    text-align: center;
  }

  .approach-pillars {
    grid-template-columns: 1fr;
  }

  .section-header h2 {
    font-size: 2rem;
  }

  .pricing-grid[style*="1fr 1fr"] {
    grid-template-columns: 1fr !important;
  }

  .page-header {
    padding: 7rem 0 3rem;
  }
}