:root {
  /* Premium Light Theme Variables */
  --gss-bg-base: #f8fafc;
  --gss-bg-surface: #ffffff;
  --gss-bg-alt: #f1f5f9;
  
  --gss-text-primary: #0f172a;
  --gss-text-secondary: #334155;
  --gss-text-tertiary: #64748b;
  
  --gss-accent-primary: #0284c7;
  --gss-accent-secondary: #0ea5e9;

  --gss-glass-bg: rgba(255, 255, 255, 0.85);
  --gss-glass-border: rgba(0, 0, 0, 0.08);
  
  --gss-shadow-glass: 0 10px 30px rgba(0, 0, 0, 0.06);
  --gss-shadow-card: 0 14px 36px rgba(0, 0, 0, 0.08);
  --gss-shadow-glow: 0 0 20px rgba(2, 132, 199, 0.15);

  --font-primary: "Inter", "Helvetica Neue", Arial, sans-serif;
  --font-heading: "Outfit", "Inter", "Helvetica Neue", Arial, sans-serif;
  
  --font-size-display: clamp(2.5rem, 5vw, 4rem);
  --font-size-hero: clamp(2.75rem, 7vw, 4.5rem);
  --font-size-h2: clamp(2rem, 3.5vw, 2.75rem);
  --font-size-h3: clamp(1.25rem, 2.5vw, 1.5rem);
  --font-size-body: 1.0625rem;
  --font-size-caption: 0.875rem;
  --font-size-card: 1rem;
  --font-size-cta: 1.125rem;
  
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  
  --line-height-body: 1.7;
  --line-height-heading: 1.15;
  --letter-spacing-heading: -0.02em;
  --letter-spacing-label: 0.1em;

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 7rem;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  --container-max: 1140px;
  --content-max: 760px;
  
  --header-height: 100px;
  --header-height-solid: 70px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height-solid);
}

body {
  margin: 0;
  background: var(--gss-bg-base);
  color: var(--gss-text-secondary);
  font-family: var(--font-primary);
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-regular);
  line-height: var(--line-height-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg { display: block; max-width: 100%; }

a {
  color: inherit;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
  transition: color 0.2s ease;
}
a:hover { color: var(--gss-accent-primary); }

button { font: inherit; }

:focus-visible {
  outline: 2px solid var(--gss-accent-primary);
  outline-offset: 2px;
}

h1, h2, h3, p { margin-top: 0; }

h1, h2, h3 {
  font-family: var(--font-heading);
  color: var(--gss-text-primary);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-heading);
  line-height: var(--line-height-heading);
}

h1 { font-size: var(--font-size-hero); margin-bottom: var(--space-md); }
h2 { font-size: var(--font-size-h2); margin-bottom: var(--space-sm); }
h3 { font-size: var(--font-size-h3); margin-bottom: var(--space-sm); }
p { margin-bottom: var(--space-sm); }
p:last-child { margin-bottom: 0; }

.container {
  width: min(100%, var(--container-max));
  margin-inline: auto;
  padding-inline: clamp(var(--space-sm), 4vw, var(--space-lg));
}

.skip-link {
  position: fixed;
  left: var(--space-sm);
  top: var(--space-sm);
  z-index: 1000;
  transform: translateY(calc(-100% - var(--space-lg)));
  border-radius: var(--radius-md);
  background: var(--gss-accent-primary);
  color: #fff;
  padding: var(--space-xs) var(--space-sm);
  transition: transform 160ms ease;
  font-weight: var(--font-weight-medium);
  text-decoration: none;
}
.skip-link:focus { transform: translateY(0); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; }

/* Header and Navigation */

@keyframes shrink-header {
  to {
    height: var(--header-height-solid);
    background: var(--gss-glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--gss-glass-border);
    box-shadow: var(--gss-shadow-glass);
  }
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: transparent;
  color: var(--gss-text-primary);
  height: var(--header-height);
}

@supports ((animation-timeline: scroll()) and (animation-range: 0% 100%)) {
  .site-header {
    animation: shrink-header auto linear both;
    animation-timeline: scroll(block root);
    animation-range: 0px 150px;
  }
}

.no-scroll-driven .site-header {
  transition: height 0.3s ease, background 0.3s ease, backdrop-filter 0.3s ease, box-shadow 0.3s ease, border-bottom 0.3s ease;
}
.no-scroll-driven .site-header.is-solid {
  background: var(--gss-glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--gss-glass-border);
  box-shadow: var(--gss-shadow-glass);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
}

.brand, .footer-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--gss-text-primary);
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: var(--font-weight-semibold);
  text-decoration: none;
}
.brand:hover { color: var(--gss-accent-primary); }

.brand-logo { width: 40px; height: 40px; }
.brand-logo--default { display: block; }
.brand-logo--white { display: none; }

.nav-toggle {
  min-width: 44px;
  min-height: 44px;
  border: 1px solid var(--gss-glass-border);
  border-radius: var(--radius-md);
  background: rgba(0,0,0,0.02);
  color: var(--gss-text-primary);
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  cursor: pointer;
  transition: background 0.2s;
}
.nav-toggle:hover { background: rgba(0,0,0,0.05); }
.nav-toggle-line { width: 20px; height: 2px; border-radius: var(--radius-sm); background: currentColor; }

.primary-nav {
  position: absolute;
  top: 100%;
  left: clamp(var(--space-sm), 4vw, var(--space-lg));
  right: clamp(var(--space-sm), 4vw, var(--space-lg));
  display: none;
  flex-direction: column;
  gap: var(--space-xs);
  border: 1px solid var(--gss-glass-border);
  border-radius: var(--radius-lg);
  background: var(--gss-bg-surface);
  box-shadow: var(--gss-shadow-glass);
  padding: var(--space-sm);
}
.primary-nav.is-open { display: flex; }
.primary-nav a {
  min-height: 44px;
  display: flex;
  align-items: center;
  border-radius: var(--radius-md);
  padding: var(--space-xs) var(--space-sm);
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  color: var(--gss-text-secondary);
  transition: background 0.2s, color 0.2s;
}
.primary-nav a:hover {
  background: rgba(2, 132, 199, 0.05);
  color: var(--gss-accent-primary);
}

/* Base Sections */
.section { padding-block: var(--space-xl); overflow: hidden; }

/* Hero Section */
.hero {
  min-height: 100svh;
  display: flex;
  align-items: center;
  background: radial-gradient(circle at 80% 20%, rgba(2, 132, 199, 0.08) 0%, transparent 50%),
              radial-gradient(circle at 20% 80%, rgba(14, 165, 233, 0.05) 0%, var(--gss-bg-base) 70%);
  color: var(--gss-text-primary);
  padding-block: calc(var(--space-2xl) + var(--header-height)) var(--space-2xl);
  position: relative;
  text-align: center;
}
.hero-inner { position: relative; max-width: 900px; margin: 0 auto; z-index: 2; }
.eyebrow {
  color: var(--gss-accent-primary);
  font-family: var(--font-heading);
  font-size: var(--font-size-caption);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-label);
  line-height: 1.4;
  margin-bottom: var(--space-sm);
  text-transform: uppercase;
}

.hero-subhead {
  max-width: 640px;
  margin-inline: auto;
  margin-bottom: var(--space-lg);
  color: var(--gss-text-secondary);
  font-size: 1.125rem;
  line-height: 1.6;
}

.hero-actions { display: flex; flex-direction: column; align-items: center; gap: var(--space-sm); }

.button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  padding: 0.8rem 1.5rem;
  font-family: var(--font-heading);
  font-size: var(--font-size-cta);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.3s ease, background 0.3s ease;
}
.button-primary {
  background: linear-gradient(135deg, var(--gss-accent-primary), var(--gss-accent-secondary));
  color: #fff;
  box-shadow: 0 4px 15px rgba(2, 132, 199, 0.25);
  border: 1px solid rgba(255,255,255,0.1);
}
.button-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 8px 25px rgba(2, 132, 199, 0.4);
  color: #fff;
}

.text-link {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  transition: color 0.2s;
}
.text-link--light { color: var(--gss-text-secondary); }
.text-link--light:hover { color: var(--gss-text-primary); }

/* Layout Grid Utilities */
.about-grid, .service-grid, .steps-grid, .industry-grid { display: grid; gap: var(--space-md); }

.section-intro { margin-bottom: var(--space-lg); }
.section-intro--center { max-width: var(--content-max); margin-inline: auto; text-align: center; }
.section-intro--center p:not(.eyebrow) { font-size: 1.125rem; }
.section-intro--left { margin-bottom: 0; }

.accent-rule {
  width: 60px; height: 3px; border-radius: var(--radius-sm);
  background: var(--gss-accent-primary); margin-top: var(--space-md);
}

.copy-column { max-width: var(--content-max); }

.founder-section { background: var(--gss-bg-alt); }
.founder-bio { max-width: var(--content-max); margin-inline: auto; }
.founder-title {
  color: var(--gss-accent-primary);
  font-weight: var(--font-weight-medium);
}

/* Scroll-driven entry/exit animations */
@keyframes slide-up {
  0% { opacity: 0; transform: translateY(40px); }
  100% { opacity: 1; transform: translateY(0); }
}

@media (prefers-reduced-motion: no-preference) {
  @supports ((animation-timeline: view()) and (animation-range: entry)) {
    .animate-on-scroll {
      animation: slide-up auto cubic-bezier(0.2, 0.8, 0.2, 1) both;
      animation-timeline: view();
      animation-range: entry 5% cover 25%;
    }
  }
}

.no-scroll-driven .animate-on-scroll {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s cubic-bezier(0.2, 0.8, 0.2, 1), transform 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.no-scroll-driven .animate-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}


/* Services */
.services { background: var(--gss-bg-alt); }

.service-card {
  background: var(--gss-bg-surface);
  border: 1px solid var(--gss-glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), border-color 0.4s, box-shadow 0.4s;
  box-shadow: 0 4px 10px rgba(0,0,0,0.02);
}
.service-card:hover {
  border-color: rgba(2, 132, 199, 0.2);
  box-shadow: var(--gss-shadow-card);
  transform: translateY(-8px);
}

.card-number {
  color: var(--gss-accent-secondary);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: var(--font-size-caption);
  line-height: 1;
  margin-bottom: var(--space-md);
}

.service-card h3 { font-size: 1.25rem; margin-bottom: 0.75rem; }
.service-card p:not(.card-number), .service-card li { font-size: var(--font-size-card); color: var(--gss-text-secondary); }

.service-card ul { list-style: none; margin: var(--space-md) 0 0; padding: 0; }
.service-card li { position: relative; padding-left: 1.45rem; margin-bottom: var(--space-xs); }
.service-card li::before {
  content: "→";
  position: absolute; left: 0;
  color: var(--gss-accent-primary);
  font-weight: var(--font-weight-medium);
}

/* Approach & Industries */
.approach { background: var(--gss-bg-base); }
.industries { background: var(--gss-bg-alt); }

.step-card, .industry-card {
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  border: 1px solid var(--gss-glass-border);
  background: var(--gss-bg-surface);
  box-shadow: 0 4px 10px rgba(0,0,0,0.02);
  transition: transform 0.4s ease, border-color 0.4s ease, box-shadow 0.4s ease;
}
.step-card:hover, .industry-card:hover {
  transform: translateY(-5px);
  border-color: rgba(2, 132, 199, 0.2);
  box-shadow: var(--gss-shadow-card);
}

.step-number {
  color: transparent;
  -webkit-text-stroke: 1.5px var(--gss-accent-primary);
  font-size: 3.5rem;
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1;
  margin-bottom: var(--space-md);
}

.industry-icon { display: block; margin-bottom: var(--space-md); stroke: var(--gss-accent-primary); }

/* Contact */
.contact {
  background: radial-gradient(circle at center, rgba(14, 165, 233, 0.08) 0%, var(--gss-bg-base) 100%);
  color: var(--gss-text-secondary);
  text-align: center;
  border-top: 1px solid var(--gss-glass-border);
}
.contact-inner { max-width: var(--content-max); }
.contact h2 { color: var(--gss-text-primary); }
.contact p:not(.eyebrow) {
  max-width: 580px; margin-inline: auto; margin-bottom: var(--space-lg); font-size: 1.125rem;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--gss-glass-border);
  background: var(--gss-bg-surface);
  color: var(--gss-text-tertiary);
  padding-block: var(--space-md);
}
.footer-inner {
  display: flex; flex-direction: column; align-items: center; gap: var(--space-sm); text-align: center;
}
.footer-brand { color: var(--gss-text-primary); font-size: 1rem; text-decoration: none; font-weight: var(--font-weight-medium); }
.footer-brand:hover { color: var(--gss-accent-primary); }
.footer-brand img { width: 32px; height: 32px; }
.site-footer p { font-size: var(--font-size-caption); margin: 0; }

/* Responsive Adjustments */
@media (min-width: 600px) {
  .hero-actions { flex-direction: row; justify-content: center; }
  .service-card, .step-card, .industry-card { padding: var(--space-lg); }
}

@media (min-width: 900px) {
  .nav-toggle { display: none; }
  
  .primary-nav {
    position: static;
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: var(--space-sm);
    border: 0;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
    padding: 0;
  }
  .primary-nav a { padding-inline: var(--space-xs); }
  .primary-nav a:hover { background: transparent; }

  .section { padding-block: var(--space-2xl); }
  
  .about-grid { grid-template-columns: 1fr 1.5fr; gap: var(--space-xl); align-items: start; }
  .service-grid { grid-template-columns: repeat(2, 1fr); gap: var(--space-md); }
  .steps-grid, .industry-grid { grid-template-columns: repeat(3, 1fr); gap: var(--space-md); }
  
  .footer-inner { flex-direction: row; justify-content: space-between; text-align: left; }
}

@media (min-width: 1200px) {
  .container { padding-inline: var(--space-sm); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
  .button-primary:hover, .service-card:hover, .step-card:hover, .industry-card:hover { transform: none; }
}