/* ============================================
   Neryx Applied Intelligence Design System - CSS
   ============================================
   Lightweight, accessible design system
   All colors meet WCAG AA contrast requirements
   ============================================ */

/* DESIGN TOKENS
   ============================================ */

:root{
  /* Spacing Scale (4px base) */
  --spacing-xs:8px;
  --spacing-sm:12px;
  --spacing-md:16px;
  --spacing-lg:24px;
  --spacing-xl:32px;
  --spacing-2xl:48px;
  --spacing-3xl:64px;
  --spacing-4xl:80px;
  
  /* Type Scale */
  --font-size-sm:14px;
  --font-size-base:16px;
  --font-size-lead:20px;
  --font-size-h3:18px;
  --font-size-h2:32px;
  --font-size-h1:64px;
  
  --line-height-tight:1.1;
  --line-height-normal:1.2;
  --line-height-relaxed:1.6;
  --line-height-loose:1.8;
  
  --font-weight-regular:400;
  --font-weight-medium:500;
  --font-weight-semibold:600;
  --font-weight-bold:700;
  
  /* Color Palette */
  /* Primary Accent */
  --accent:#c47b2a;
  --accent-hover:#d48a35;
  --accent-light:rgba(196,123,42,0.1);
  --accent-lighter:rgba(196,123,42,0.05);
  
  /* Neutrals - Background */
  --bg:#0b0b0b;
  --surface:#0a0e0b;
  --card:#0f1411;
  
  /* Text Colors */
  --text-primary:#efe9df;
  --text-heading:#ffffff;
  --text-secondary:#9aa6a0;
  
  /* Borders */
  --border-light:rgba(255,255,255,.03);
  --border-lighter:rgba(255,255,255,.02);
  --border-hover:rgba(196,123,42,0.3);
  
  /* Layout */
  --container:900px;
  --radius:12px;
  --radius-sm:8px;
  
  /* Motion */
  --transition:0.3s ease;
  --transition-fast:0.15s ease;
}

/* GLOBAL STYLES
   ============================================ */

*{
  box-sizing:border-box;
}

html{
  scroll-behavior:smooth;
}

body{
  margin:0;
  font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,'Helvetica Neue',Arial;
  color:var(--text-primary);
  background:linear-gradient(180deg,#070906 0%, #0b0f0b 60%);
  font-size:var(--font-size-base);
  line-height:var(--line-height-relaxed);
  font-weight:var(--font-weight-regular);
}

/* Disable animations for users who prefer reduced motion */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:0.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:0.01ms !important;
  }
}

/* TYPOGRAPHY
   ============================================ */

h1,h2,h3{
  font-weight:var(--font-weight-bold);
  letter-spacing:-0.01em;
}

h1{
  font-size:32px;
  line-height:var(--line-height-tight);
  margin:0;
  color:var(--text-heading);
}

h2{
  font-size:24px;
  line-height:var(--line-height-normal);
  margin:0 0 var(--spacing-md);
  color:var(--text-heading);
}

h3{
  font-size:var(--font-size-h3);
  line-height:var(--line-height-normal);
  margin:0 0 var(--spacing-sm);
  color:var(--text-heading);
}

p{
  margin:0;
  line-height:var(--line-height-loose);
}

/* Text Utilities */
.text-lead{
  font-size:var(--font-size-lead);
  line-height:var(--line-height-loose);
}

.text-secondary{
  color:var(--text-secondary);
}

.text-small{
  font-size:var(--font-size-sm);
}

/* LAYOUT
   ============================================ */

.container{
  max-width:var(--container);
  margin:0 auto;
  padding:0 var(--spacing-md);
}

/* ACCESSIBILITY
   ============================================ */

.skip-link{
  position:absolute;
  top:-40px;
  left:6px;
  background:var(--accent);
  color:var(--text-heading);
  padding:8px 16px;
  text-decoration:none;
  border-radius:4px;
  z-index:1000;
  font-weight:var(--font-weight-medium);
  transition:transform var(--transition);
}

.skip-link:focus{
  top:6px;
  transform:translateY(0);
  outline:none;
  box-shadow:0 0 0 3px rgba(196,123,42,0.3);
}

/* COMPONENTS: HEADER
   ============================================ */

.site-header{
  position:sticky;
  top:0;
  z-index:100;
  background:linear-gradient(180deg,rgba(7,16,36,.6),rgba(7,16,36,.3));
  backdrop-filter:blur(6px);
  border-bottom:1px solid var(--border-light);
  transition:background var(--transition);
}

.header-row{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:var(--spacing-lg) 0;
}

.brand{
  font-weight:var(--font-weight-bold);
  color:var(--accent);
  font-size:22px;
  transition:color var(--transition);
}

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

/* Hide mobile toggle on desktop; shown via media query on small viewports */
.nav-toggle{ display:none; }

.nav{
  display:flex;
  align-items:center;
  gap:var(--spacing-xl);
}

.nav a{
  color:var(--accent);
  text-decoration:none;
  font-weight:var(--font-weight-medium);
  transition:color var(--transition);
  position:relative;
  padding-bottom:4px;
}

.nav a::after{
  content:'';
  position:absolute;
  bottom:-4px;
  left:0;
  width:0;
  height:2px;
  background:var(--accent);
  transition:width var(--transition);
}

.nav a:hover::after,
.nav a:focus::after{
  width:100%;
}

.nav a:focus{
  outline:none;
  color:var(--accent-hover);
}

.nav .btn{
  background:transparent;
  border:1px solid var(--border-light);
  padding:var(--spacing-sm) var(--spacing-md);
  border-radius:var(--radius-sm);
  color:var(--accent);
  cursor:pointer;
  font-weight:var(--font-weight-medium);
  transition:all var(--transition);
}

.nav .btn:hover,
.nav .btn:focus{
  border-color:var(--accent);
  background:var(--accent-lighter);
}

.nav .btn:focus{
  outline:none;
  box-shadow:0 0 0 3px rgba(196,123,42,0.1);
}

/* Mobile navigation: vertical, touch-friendly, accessible */
@media (max-width:767px){
  .header-row{ position:relative; }

  .nav-toggle{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    background:transparent;
    border:0;
    color:var(--text-primary);
    padding:8px;
    cursor:pointer;
  }

  .nav-toggle:focus{ outline:none; box-shadow:0 0 0 3px rgba(196,123,42,0.15); }

  .nav-toggle .hamburger{
    display:block;
    width:22px;
    height:2px;
    background:var(--text-primary);
    position:relative;
  }
  .nav-toggle .hamburger::before,
  .nav-toggle .hamburger::after{
    content:'';
    position:absolute;
    left:0;
    right:0;
    height:2px;
    background:var(--text-primary);
  }
  .nav-toggle .hamburger::before{ top:-6px; }
  .nav-toggle .hamburger::after{ top:6px; }
  .nav-toggle[aria-expanded="true"] .hamburger{ background:transparent; }
  .nav-toggle[aria-expanded="true"] .hamburger::before{ transform:rotate(45deg); top:0; }
  .nav-toggle[aria-expanded="true"] .hamburger::after{ transform:rotate(-45deg); top:0; }

  .nav{ display:none; position:absolute; left:0; right:0; top:100%; background:var(--surface); border-top:1px solid var(--border-light); flex-direction:column; padding:var(--spacing-md); gap:0; box-shadow:0 12px 32px rgba(0,0,0,0.6); z-index:120; }
  .nav.open{ display:flex; }

  .nav-mobile-header{ font-size:16px; font-weight:var(--font-weight-bold); color:var(--text-heading); padding:12px 16px; border-bottom:1px solid var(--border-lighter); margin-bottom:8px; }

  .nav a,
  .nav .btn{
    display:block;
    width:100%;
    min-height:44px; /* touch target */
    padding:12px 16px;
    text-align:left;
    border-radius:8px;
    white-space:nowrap; /* prevent horizontal wrapping */
    overflow:visible;
    box-sizing:border-box;
  }

  .nav a{ color:var(--text-primary); text-decoration:none; }
  .nav a:hover,
  .nav a:focus{ background:var(--accent-light); color:var(--text-heading); }

  .nav .btn{ background:transparent; color:var(--accent); border:1px solid var(--border-light); }
  .nav .btn:hover,
  .nav .btn:focus{ background:var(--accent-lighter); border-color:var(--accent); }

  .nav a:focus, .nav .btn:focus{ outline:none; box-shadow:0 0 0 3px rgba(196,123,42,0.15); }
}

/* COMPONENTS: HERO
   ============================================ */

.hero{
  padding:var(--spacing-2xl) 0;
  background:
    radial-gradient(ellipse at center, rgba(196,123,42,0.08) 0%, transparent 70%),
    linear-gradient(135deg, #070906 0%, #0b0f0b 50%, #070906 100%),
    url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23c47b2a' fill-opacity='0.02'%3E%3Ccircle cx='30' cy='30' r='1'/%3E%3C/g%3E%3Cg stroke='%23c47b2a' stroke-opacity='0.03' stroke-width='0.5'%3E%3Cpath d='M0 30h60M30 0v60'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  position:relative;
  overflow:hidden;
}

.hero::before{
  content:'';
  position:absolute;
  top:0;
  left:0;
  right:0;
  height:1px;
  background:linear-gradient(90deg, transparent, rgba(196,123,42,0.3), transparent);
}

.hero-inner{
  max-width:840px;
  animation:fadeInUp 0.8s ease 0.1s both;
  position:relative;
  z-index:1;
}

.hero h1{
  margin-bottom:var(--spacing-md);
  letter-spacing:-0.02em;
  line-height:1.1;
}

.lede{
  color:var(--text-secondary);
  font-size:var(--font-size-lead);
  line-height:var(--line-height-loose);
  margin-bottom:var(--spacing-lg);
  max-width:700px;
}
.trust-row{
  display:flex;
  gap:var(--spacing-md);
  margin-bottom:var(--spacing-xl);
  flex-wrap:wrap;
  justify-content:center;
}

.trust-row span{
  color:var(--text-secondary);
  font-size:14px;
  font-weight:var(--font-weight-medium);
  position:relative;
  padding:0 var(--spacing-sm);
}

.trust-row span::before{
  content:'•';
  position:absolute;
  left:-8px;
  color:var(--accent);
  font-weight:bold;
}

.trust-row span:first-child::before{
  content:'';
}

/* COMPONENTS: BUTTONS & CTA
   ============================================ */

.cta-row{
  display:flex;
  gap:var(--spacing-md);
  flex-wrap:wrap;
  margin-top:var(--spacing-lg);
  justify-content:center;
}

.cta{
  display:inline-block;
  padding:12px 24px;
  border-radius:8px;
  text-decoration:none;
  color:var(--text-heading);
  background:linear-gradient(135deg, var(--accent) 0%, var(--accent-hover) 100%);
  border:none;
  cursor:pointer;
  font-weight:var(--font-weight-semibold);
  font-size:16px;
  transition:all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow:0 4px 16px rgba(196,123,42,0.25), 0 2px 8px rgba(0,0,0,0.1);
  position:relative;
  overflow:hidden;
}

.cta::before{
  content:'';
  position:absolute;
  top:0;
  left:-100%;
  width:100%;
  height:100%;
  background:linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition:left 0.5s;
}

.cta:hover::before{
  left:100%;
}

.cta:hover{
  transform:translateY(-3px);
  box-shadow:0 8px 32px rgba(196,123,42,0.4), 0 4px 16px rgba(0,0,0,0.2);
  background:linear-gradient(135deg, var(--accent-hover) 0%, #d48a35 100%);
}

.cta:focus{
  outline:none;
  box-shadow:0 8px 32px rgba(196,123,42,0.4), 0 4px 16px rgba(0,0,0,0.2), 0 0 0 3px rgba(196,123,42,0.3);
}

.cta:active{
  transform:translateY(-1px);
}

.cta.primary{
  background:var(--accent);
}

/* COMPONENTS: CTA BLOCK
   ============================================ */

.cta-block{
  text-align:center;
  max-width:600px;
  margin:0 auto;
}

.cta-block h2{
  margin-bottom:var(--spacing-md);
  color:var(--text-heading);
}

.cta-block > p{
  font-size:18px;
  color:var(--text-secondary);
  margin-bottom:var(--spacing-2xl);
  line-height:1.6;
}

.cta-actions{
  display:flex;
  gap:var(--spacing-md);
  justify-content:center;
  margin-bottom:var(--spacing-xl);
  flex-wrap:wrap;
}

.cta-primary,
.cta-secondary{
  padding:16px 32px;
  border-radius:8px;
  text-decoration:none;
  font-weight:var(--font-weight-semibold);
  font-size:16px;
  transition:all var(--transition);
  display:inline-block;
  cursor:pointer;
  border:none;
}

.cta-primary{
  background:linear-gradient(135deg, var(--accent) 0%, var(--accent-hover) 100%);
  color:var(--text-heading);
  box-shadow:0 4px 16px rgba(196,123,42,0.25);
}

.cta-primary:hover{
  transform:translateY(-2px);
  box-shadow:0 8px 24px rgba(196,123,42,0.4);
  background:linear-gradient(135deg, var(--accent-hover) 0%, #d48a35 100%);
}

.cta-secondary{
  background:transparent;
  border:2px solid var(--accent);
  color:var(--accent);
}

.cta-secondary:hover{
  background:var(--accent-lighter);
  transform:translateY(-1px);
}

.form-actions{
  display:flex;
  gap:var(--spacing-md);
  justify-content:flex-end;
  margin-top:var(--spacing-md);
}

/* COMPONENTS: SECTIONS
   ============================================ */

.section{
  padding:var(--spacing-2xl) 0;
  position:relative;
}

.section.alt{
  background:linear-gradient(180deg, rgba(255,255,255,0.01), transparent);
}

.section h2{
  position:relative;
  padding-bottom:var(--spacing-md);
  color:var(--accent);
}

.section h2::before{
  content:'';
  position:absolute;
  bottom:0;
  left:0;
  width:60px;
  height:3px;
  background:var(--accent);
  border-radius:2px;
}

.section-lead{
  color:var(--text-secondary);
  font-size:18px;
  margin-bottom:var(--spacing-xl);
  line-height:var(--line-height-loose);
}

/* COMPONENTS: GRID & CARDS
   ============================================ */

.grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(280px,1fr));
  gap:var(--spacing-lg);
  margin-top:var(--spacing-lg);
}

.card{
  display:flex;
  flex-direction:column;
  background:linear-gradient(135deg, rgba(255,255,255,0.03), rgba(255,255,255,0.01));
  padding:var(--spacing-lg);
  border-radius:var(--radius);
  border-left:4px solid var(--accent);
  border-top:1px solid var(--border-light);
  border-right:1px solid var(--border-lighter);
  border-bottom:1px solid var(--border-lighter);
  transition:all var(--transition);
  position:relative;
  overflow:hidden;
}

.card::before{
  content:'';
  position:absolute;
  top:0;
  right:0;
  width:100px;
  height:100px;
  background:radial-gradient(circle, rgba(196,123,42,0.1), transparent);
  border-radius:50%;
  pointer-events:none;
  transition:opacity var(--transition);
}

.card:hover{
  transform:translateY(-4px);
  border-color:var(--accent);
  background:linear-gradient(135deg, rgba(255,255,255,0.05), rgba(255,255,255,0.02));
  box-shadow:0 12px 24px rgba(0,0,0,0.3);
}

.card:hover::before{
  opacity:1.5;
}

.card:focus-within{
  outline:none;
  box-shadow:0 12px 24px rgba(0,0,0,0.3), 0 0 0 2px var(--accent);
}

.card h3{
  position:relative;
  z-index:1;
}

.card p{
  color:var(--text-secondary);
  flex:1;
  position:relative;
  z-index:1;
  line-height:var(--line-height-loose);
}

.card-icon{
  display:flex;
  align-items:center;
  justify-content:center;
  width:48px;
  height:48px;
  background:linear-gradient(135deg, var(--accent) 0%, var(--accent-hover) 100%);
  border-radius:50%;
  margin-bottom:var(--spacing-md);
  color:var(--text-heading);
  transition:all var(--transition);
  position:relative;
  z-index:1;
}

.card-icon svg{
  width:24px;
  height:24px;
  transition:transform var(--transition);
}

.card:hover .card-icon{
  transform:scale(1.1);
  box-shadow:0 8px 16px rgba(196,123,42,0.3);
}

.card:hover .card-icon svg{
  transform:scale(1.1);
}

/* COMPONENTS: FORMS
   ============================================ */

.contact-form{
  max-width:620px;
  display:flex;
  flex-direction:column;
  gap:var(--spacing-md);
  margin-top:var(--spacing-lg);
}

.form-input,
.form-textarea,
.contact-form input,
.contact-form textarea{
  background:var(--card);
  border:1px solid var(--border-light);
  padding:var(--spacing-md) var(--spacing-lg);
  border-radius:var(--radius-sm);
  color:var(--text-primary);
  font-size:15px;
  font-family:inherit;
  transition:all var(--transition);
}

.form-input::placeholder,
.form-textarea::placeholder,
.contact-form input::placeholder,
.contact-form textarea::placeholder{
  color:rgba(157,166,160,0.6);
}

.form-input:focus,
.form-textarea:focus,
.contact-form input:focus,
.contact-form textarea:focus{
  outline:none;
  border-color:var(--accent);
  background:rgba(15,20,17,0.8);
  box-shadow:0 0 0 3px rgba(196,123,42,0.1);
}

.form-row{
  display:flex;
  gap:var(--spacing-md);
  flex-wrap:wrap;
  margin-top:var(--spacing-md);
}

/* COMPONENTS: BUTTONS
   ============================================ */

.btn{
  padding:12px 20px;
  border-radius:var(--radius-sm);
  border:none;
  background:transparent;
  color:var(--text-primary);
  cursor:pointer;
  font-weight:var(--font-weight-semibold);
  font-size:14px;
  transition:all var(--transition);
  position:relative;
}

.btn:hover{
  background:rgba(255,255,255,0.05);
  transform:translateY(-1px);
}

.btn:focus{
  outline:none;
  background:rgba(255,255,255,0.05);
  box-shadow:0 0 0 3px rgba(196,123,42,0.1);
}

.btn:active{
  transform:translateY(0);
}

.btn-primary,
.btn.primary{
  background:var(--accent);
  color:var(--text-heading);
  padding:14px 28px;
  font-size:15px;
  box-shadow:0 4px 12px rgba(196,123,42,0.2);
}

.btn-primary:hover,
.btn.primary:hover{
  background:var(--accent-hover);
  box-shadow:0 6px 20px rgba(196,123,42,0.3);
  transform:translateY(-2px);
}

.btn-primary:focus,
.btn.primary:focus{
  outline:none;
  box-shadow:0 6px 20px rgba(196,123,42,0.3), 0 0 0 3px rgba(196,123,42,0.2);
}

.btn-primary:active,
.btn.primary:active{
  transform:translateY(0);
}

.btn-secondary,
.btn.secondary{
  background:transparent;
  border:1px solid var(--border-light);
  color:var(--text-secondary);
}

.btn-secondary:hover,
.btn.secondary:hover{
  border-color:var(--accent);
  background:var(--accent-lighter);
  color:var(--accent);
}

/* COMPONENTS: SUCCESS BANNER
   ============================================ */

.success-banner{
  background:linear-gradient(90deg, rgba(196,123,42,0.15), rgba(196,123,42,0.08));
  border-left:4px solid var(--accent);
  border-top:1px solid rgba(196,123,42,0.3);
  color:var(--text-heading);
  padding:var(--spacing-lg) var(--spacing-xl);
  border-radius:var(--radius-sm);
  margin-top:var(--spacing-xl);
  font-weight:var(--font-weight-medium);
  line-height:var(--line-height-loose);
  animation:slideInUp 0.4s ease;
}

.success-banner strong{
  color:var(--text-heading);
}

/* COMPONENTS: FOOTER
   ============================================ */

.site-footer{
  border-top:1px solid var(--border-light);
  padding:var(--spacing-2xl) 0;
  margin-top:var(--spacing-4xl);
  background:linear-gradient(180deg, transparent, rgba(0,0,0,0.2));
}

.footer-row{
  display:flex;
  justify-content:space-between;
  align-items:center;
  color:var(--text-secondary);
  flex-wrap:wrap;
  gap:var(--spacing-lg);
}

.small-links{
  display:flex;
  gap:var(--spacing-lg);
}

.small-links a{
  color:var(--text-secondary);
  text-decoration:none;
  font-size:var(--font-size-sm);
  transition:color var(--transition);
}

.small-links a:hover,
.small-links a:focus{
  color:var(--text-heading);
}

.small-links a:focus{
  outline:none;
}

/* UTILITIES
   ============================================ */

.hidden{
  display:none !important;
}

.sr-only{
  position:absolute;
  width:1px;
  height:1px;
  padding:0;
  margin:-1px;
  overflow:hidden;
  clip:rect(0,0,0,0);
  white-space:nowrap;
  border-width:0;
}

/* ANIMATIONS
   ============================================ */

@keyframes fadeInUp{
  from{
    opacity:0;
    transform:translateY(20px);
  }
  to{
    opacity:1;
    transform:translateY(0);
  }
}

@keyframes slideInUp{
  from{
    opacity:0;
    transform:translateY(10px);
  }
  to{
    opacity:1;
    transform:translateY(0);
  }
}

/* ABOUT SECTION
   ============================================ */

.about-content{
  max-width:680px;
  margin:0 auto;
}

.about-content p{
  font-size:18px;
  line-height:1.7;
  color:var(--text-secondary);
  margin-bottom:var(--spacing-xl);
  text-align:left;
}

.about-content p:last-child{
  margin-bottom:0;
}

.about-content strong{
  color:var(--text-heading);
  font-weight:var(--font-weight-semibold);
}

/* RESPONSIVE DESIGN
   ============================================ */

@media (min-width:768px){
  h1{font-size:48px}
  h2{font-size:28px}
  
  .hero{padding:var(--spacing-3xl) 0}
  .hero h1{margin-bottom:var(--spacing-md); font-size:48px}
  .lede{font-size:18px;margin-bottom:var(--spacing-md)}
  
  .trust-row{gap:var(--spacing-md); justify-content:flex-start}
  .trust-row span{font-size:13px}
  
  .section{padding:var(--spacing-3xl) 0}
  
  .grid{grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:var(--spacing-md)}
  
  .cta-row{gap:var(--spacing-sm)}
  .cta{padding:14px 24px;font-size:15px}
  
  .nav{gap:var(--spacing-md)}
  .nav a{font-size:14px}
  
  .header-row{padding:var(--spacing-md) 0}
  .brand{font-size:20px}
  
  .form-input,
  .form-textarea,
  .contact-form input,
  .contact-form textarea{
    padding:var(--spacing-md);
  }
  
  .form-row{flex-direction:column}
  .btn{width:100%}
  
  .footer-row{flex-direction:column;text-align:center}
  .small-links{justify-content:center}
}

@media (min-width:1024px){
  h1{font-size:64px;line-height:var(--line-height-tight)}
  h2{font-size:32px}
  
  .hero{padding:var(--spacing-4xl) 0}
  .hero h1{font-size:64px;margin-bottom:var(--spacing-lg)}
  .lede{font-size:20px;margin-bottom:var(--spacing-xl)}
  
  .trust-row{gap:var(--spacing-xl); justify-content:center}
  .trust-row span{font-size:14px}
  
  .section{padding:var(--spacing-4xl) 0}
  .section-lead{margin-bottom:var(--spacing-2xl)}
  
  .grid{margin-top:var(--spacing-xl)}
  
  .cta{padding:16px 32px;font-size:16px}
  
  .card{padding:var(--spacing-lg)}
  
  .section h2::before{width:60px}
  
  .contact-form{max-width:620px}
  
  .form-row{flex-direction:row}
  .btn{width:auto}
  
  .footer-row{flex-direction:row;text-align:left}
  .small-links{justify-content:flex-start}
}