/* ============================================
   Custom Properties
   ============================================ */
:root {
  --bg: #0a0a0a;
  --text: #fcfcfa;
  --text-secondary: #999;
  --border: rgba(255, 255, 255, 0.08);

  --font-heading: 'Satoshi', sans-serif;
  --font-body: 'Inter', sans-serif;

  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 96px;

  --container: 600px;
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);

  color-scheme: dark light;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #fcfcfa;
    --text: #0a0a0a;
    --text-secondary: #555;
    --border: rgba(0, 0, 0, 0.08);
  }
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }

/* Focus */
:focus-visible {
  outline: 2px solid var(--text);
  outline-offset: 2px;
  border-radius: 2px;
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-lg);
  padding: var(--space-sm) var(--space-md);
  background: var(--text);
  color: var(--bg);
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 500;
  border-radius: 6px;
  z-index: 100;
}

.skip-link:focus {
  top: var(--space-sm);
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3 {
  font-family: var(--font-heading);
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: -0.03em;
}

h1 {
  font-size: clamp(1.75rem, 4vw, 2rem);
  font-weight: 700;
}

h2 {
  font-size: clamp(1.5rem, 3.5vw, 1.875rem);
}

h3 {
  font-size: clamp(1.125rem, 2.5vw, 1.25rem);
}

/* ============================================
   Layout
   ============================================ */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

section {
  padding: var(--space-3xl) 0;
}

/* ============================================
   Header
   ============================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  padding: var(--space-md) 0;
  background: var(--bg);
}

.site-header::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--border);
}

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

.header-identity {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-shrink: 0;
}

.header-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
}

.header-name-group {
  display: flex;
  flex-direction: column;
  gap: 2px;
  line-height: 1.2;
}

.header-name {
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.header-subtitle {
  font-family: var(--font-heading);
  font-weight: 400;
  font-size: 13px;
  color: var(--text-secondary);
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.02em;
  padding: 12px 20px;
  min-height: 44px;
  border-radius: 6px;
  background: var(--text);
  color: var(--bg);
  transition: opacity 200ms var(--ease-out-quart);
  flex-shrink: 0;
}

.btn:hover { opacity: 0.85; }

/* ============================================
   Hero
   ============================================ */
.hero {
  padding-top: var(--space-4xl);
  padding-bottom: var(--space-3xl);
}

.hero h1 {
  margin-bottom: var(--space-lg);
}

.hero-tagline {
  font-size: clamp(1rem, 2.5vw, 1.125rem);
  color: var(--text-secondary);
  max-width: 55ch;
  line-height: 1.7;
  margin-bottom: var(--space-xl);
}

.hero-problems {
  list-style: none;
  margin-bottom: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.hero-problems li {
  font-size: 15px;
  color: var(--text-secondary);
  padding-left: var(--space-lg);
  position: relative;
}

.hero-problems li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--text-secondary);
  opacity: 0.5;
}

.hero-solution {
  font-size: clamp(1rem, 2.5vw, 1.125rem);
  font-weight: 500;
  line-height: 1.7;
  max-width: 55ch;
}

/* ============================================
   Clients
   ============================================ */
.clients {
  padding-top: var(--space-2xl);
  padding-bottom: var(--space-2xl);
}

.clients h2 {
  margin-bottom: var(--space-xl);
}

.logo-marquee {
  overflow: hidden;
  mask-image: linear-gradient(
    to right,
    transparent,
    black 5%,
    black 95%,
    transparent
  );
  -webkit-mask-image: linear-gradient(
    to right,
    transparent,
    black 5%,
    black 95%,
    transparent
  );
}

.logo-marquee-inner {
  display: flex;
  width: max-content;
}

.logo-marquee-track {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  animation: marquee 16s linear infinite;
}

.logo-marquee-track img {
  height: 44px;
  width: auto;
  margin: 0 32px;
  filter: grayscale(1) brightness(2);
  flex-shrink: 0;
}

@media (prefers-color-scheme: light) {
  .logo-marquee-track img {
    filter: grayscale(1) brightness(0.4);
  }
}

.logo-marquee:hover .logo-marquee-track {
  animation-play-state: paused;
}

@keyframes marquee {
  0%   { transform: translateX(0); }
  100% { transform: translateX(-100%); }
}

/* ============================================
   Case Studies
   ============================================ */
.case-studies {
  padding-top: var(--space-3xl);
  padding-bottom: var(--space-2xl);
}

.case-studies > .container > h2 {
  margin-bottom: var(--space-2xl);
}

.case-study {
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--border);
}

.case-study:last-child {
  border-bottom: 1px solid var(--border);
}

.case-study h3 {
  margin-bottom: var(--space-md);
}

.case-study-scope {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
  line-height: 1.6;
  max-width: 55ch;
}

.case-study-scope em {
  font-style: normal;
  font-weight: 600;
  color: var(--text);
}

.case-study-details {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 55ch;
}

.case-study-details p {
  margin-bottom: var(--space-sm);
}

.case-study-details ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  margin-top: var(--space-sm);
}

.case-study-details li {
  padding-left: var(--space-lg);
  position: relative;
}

.case-study-details li::before {
  content: '→';
  position: absolute;
  left: 0;
  opacity: 0.5;
}

/* ============================================
   Testimonials
   ============================================ */
.testimonials {
  padding-top: var(--space-3xl);
  padding-bottom: var(--space-3xl);
}

.testimonials > .container > h2 {
  margin-bottom: var(--space-2xl);
}

.testimonial {
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--border);
}

.testimonial:last-child {
  border-bottom: 1px solid var(--border);
}

.testimonial-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.testimonial-photo {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.testimonial-meta h3 {
  margin-bottom: 2px;
}

.testimonial-role {
  font-size: 14px;
  color: var(--text-secondary);
}

.testimonial-role em {
  font-style: normal;
}

.testimonial-role .highlight {
  color: var(--text);
}

.testimonial-body {
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-secondary);
  max-width: 55ch;
}

.testimonial-body p { margin-bottom: var(--space-md); }
.testimonial-body p:last-child { margin-bottom: 0; }

.testimonial-body strong {
  color: var(--text);
  font-weight: 500;
}

.testimonial-body ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  margin: var(--space-sm) 0;
}

.testimonial-body li {
  padding-left: var(--space-lg);
  position: relative;
}

.testimonial-body li::before {
  content: '→';
  position: absolute;
  left: 0;
  opacity: 0.5;
}

/* ============================================
   CTA
   ============================================ */
.cta {
  padding-top: var(--space-3xl);
  padding-bottom: var(--space-4xl);
}

.cta h2 {
  margin-bottom: var(--space-lg);
}

.cta-body {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 55ch;
  margin-bottom: var(--space-xl);
}

.cta-body p { margin-bottom: var(--space-sm); }

.cta .btn {
  margin-bottom: var(--space-lg);
}

.cta-email {
  font-size: 14px;
  color: var(--text-secondary);
}

.cta-email a {
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* ============================================
   Scroll Reveal
   ============================================ */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 600ms var(--ease-out-expo), transform 600ms var(--ease-out-expo);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 809px) {
  :root {
    --container: 100%;
  }

  section {
    padding: var(--space-2xl) 0;
  }

  .hero {
    padding-top: var(--space-3xl);
  }

  .hero h1 {
    text-wrap: balance;
  }

  .logo-marquee-track img {
    height: 28px;
    margin: 0 20px;
  }

  .testimonial-photo {
    width: 44px;
    height: 44px;
  }

  .testimonial-body {
    font-size: 14px;
  }

}

/* ============================================
   Reduced Motion
   ============================================ */
@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .logo-marquee-track {
    animation-play-state: paused;
  }
}