:root {
  --color-background: #fafafa;
  --color-foreground: #0a0a0a;
  --color-primary: #0a0a0a;
  --color-primary-foreground: #fafafa;
  --color-secondary: #f5f5f5;
  --color-secondary-foreground: #0a0a0a;
  --color-muted: #f5f5f5;
  --color-muted-foreground: #737373;
  --color-border: #0a0a0a;
  --color-card: #ffffff;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  
  /* Typography */
  --font-sans: 'Space Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'Space Mono', monospace;
  
  /* Shadows */
  --shadow-sm: 4px 4px 0 0 var(--color-border);
  --shadow-md: 6px 6px 0 0 var(--color-border);
  --shadow-lg: 8px 8px 0 0 var(--color-border);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-foreground);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* ========================================
   Container
======================================== */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* ========================================
   Typography
======================================== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 3vw, 1.5rem); }

/* ========================================
   Buttons
======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.75rem 1.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.025em;
  border: 2px solid var(--color-border);
  transition: all var(--transition-fast);
  cursor: pointer;
}

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

.btn--primary:hover {
  background-color: var(--color-foreground);
  box-shadow: var(--shadow-sm);
  transform: translate(-2px, -2px);
}

.btn--secondary {
  background-color: var(--color-secondary);
  color: var(--color-secondary-foreground);
}

.btn--secondary:hover {
  background-color: var(--color-background);
  box-shadow: var(--shadow-sm);
  transform: translate(-2px, -2px);
}

.btn--outline {
  background-color: transparent;
  color: var(--color-foreground);
}

.btn--outline:hover {
  background-color: var(--color-secondary);
}

.btn--outline-light {
  background-color: transparent;
  color: var(--color-primary-foreground);
  border-color: var(--color-primary-foreground);
}

.btn--outline-light:hover {
  background-color: var(--color-primary-foreground);
  color: var(--color-primary);
}

.btn--lg {
  padding: 1rem 2rem;
  font-size: 1rem;
}

.btn svg {
  transition: transform var(--transition-fast);
}

.btn:hover svg {
  transform: translateX(4px);
}

/* ========================================
   Tags
======================================== */
.tag {
  display: inline-block;
  padding: 0.25rem 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background-color: var(--color-secondary);
  border: 1px solid var(--color-border);
}

/* ========================================
   Header
======================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background-color: var(--color-background);
  border-bottom: 2px solid var(--color-border);
}

.header__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.header__logo {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.025em;
}

.header__nav {
  display: none;
  gap: var(--space-xl);
}

.header__link {
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: color var(--transition-fast);
}

.header__link:hover {
  color: var(--color-muted-foreground);
}

.header__link--active {
  border-bottom: 2px solid var(--color-foreground);
}

.header__cta {
  display: none;
}

.header__burger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-sm);
  border: 2px solid var(--color-border);
}

.header__burger span {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-foreground);
  transition: all var(--transition-fast);
}

.header__burger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.header__burger.active span:nth-child(2) {
  opacity: 0;
}

.header__burger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

@media (min-width: 768px) {
  .header__container {
    height: 80px;
  }
  
  .header__logo {
    font-size: 1.5rem;
  }
  
  .header__nav {
    display: flex;
  }
  
  .header__cta {
    display: inline-flex;
  }
  
  .header__burger {
    display: none;
  }
}

/* ========================================
   Mobile Menu
======================================== */
.mobile-menu {
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 99;
  background-color: var(--color-background);
  border-top: 2px solid var(--color-border);
  padding: var(--space-xl);
  transform: translateX(-100%);
  transition: transform var(--transition-normal);
}

.mobile-menu.active {
  transform: translateX(0);
}

.mobile-menu__nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.mobile-menu__link {
  font-size: 1.125rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.mobile-menu__cta {
  margin-top: var(--space-lg);
  width: 100%;
}

@media (min-width: 768px) {
  .mobile-menu {
    display: none;
  }
}

/* ========================================
   Sections
======================================== */
.section {
  padding: var(--space-4xl) 0;
  border-bottom: 4px solid var(--color-border);
}

.section--alt {
  background-color: var(--color-secondary);
}

.section__header {
  margin-bottom: var(--space-2xl);
}

.section__header--center {
  text-align: center;
}

.section__header--split {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.section__title {
  margin-bottom: var(--space-md);
}

.section__subtitle {
  color: var(--color-muted-foreground);
  font-size: 1.125rem;
  max-width: 600px;
}

.section__header--center .section__subtitle {
  margin: 0 auto;
}

@media (min-width: 768px) {
  .section__header--split {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-end;
  }
}

/* ========================================
   Hero Section
======================================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px;
  border-bottom: 4px solid var(--color-border);
}

.hero__container {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3xl);
  align-items: center;
}

.hero__badge {
  display: inline-block;
  padding: 0.5rem 1rem;
  background-color: var(--color-secondary);
  border: 2px solid var(--color-border);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-lg);
  box-shadow: 2px 2px 0 0 var(--color-border);
}

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

.hero__highlight {
  background-color: var(--color-primary);
  color: var(--color-primary-foreground);
  padding: 0 0.5rem;
}

.hero__text {
  font-size: 1.125rem;
  color: var(--color-muted-foreground);
  margin-bottom: var(--space-xl);
  max-width: 540px;
}

.hero__actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.hero__stats {
  position: relative;
}

.hero__stats-main {
  aspect-ratio: 1;
  background-color: var(--color-secondary);
  border: 4px solid var(--color-border);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-xl);
  text-align: center;
}

.hero__stats-number {
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 700;
  line-height: 1;
  margin-bottom: var(--space-md);
}

.hero__stats-label {
  font-size: 1.125rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.hero__stats-badge {
  position: absolute;
  bottom: -24px;
  right: -24px;
  background-color: var(--color-primary);
  color: var(--color-primary-foreground);
  border: 4px solid var(--color-border);
  padding: var(--space-lg);
  box-shadow: var(--shadow-md);
}

.hero__stats-badge-number {
  font-size: 1.5rem;
  font-weight: 700;
}

.hero__stats-badge-label {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

@media (min-width: 640px) {
  .hero__actions {
    flex-direction: row;
  }
}

@media (min-width: 1024px) {
  .hero__container {
    grid-template-columns: 1fr 1fr;
  }
}

/* ========================================
   Services Grid
======================================== */
.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

.service-card {
  background-color: var(--color-card);
  border: 2px solid var(--color-border);
  padding: var(--space-xl);
  transition: box-shadow var(--transition-fast);
}

.service-card:hover {
  box-shadow: var(--shadow-md);
}

.service-card__icon {
  margin-bottom: var(--space-md);
}

.service-card__title {
  margin-bottom: var(--space-sm);
  transition: text-decoration var(--transition-fast);
}

.service-card:hover .service-card__title {
  text-decoration: underline;
}

.service-card__text {
  color: var(--color-muted-foreground);
}

@media (min-width: 640px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ========================================
   Portfolio Grid
======================================== */
.portfolio-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

.portfolio-card {
  background-color: var(--color-card);
  border: 2px solid var(--color-border);
  transition: box-shadow var(--transition-fast);
}

.portfolio-card:hover {
  box-shadow: var(--shadow-md);
}

.portfolio-card__image {
  aspect-ratio: 16/9;
  background-color: var(--color-muted);
  border-bottom: 2px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
}

.portfolio-card__category {
  font-family: var(--font-mono);
  color: var(--color-muted-foreground);
}

.portfolio-card__content {
  padding: var(--space-lg);
}

.portfolio-card__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--space-md);
}

.portfolio-card__title {
  transition: text-decoration var(--transition-fast);
}

.portfolio-card:hover .portfolio-card__title {
  text-decoration: underline;
}

.portfolio-card__arrow {
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.portfolio-card:hover .portfolio-card__arrow {
  opacity: 1;
}

.portfolio-card__metrics {
  color: var(--color-muted-foreground);
  margin-bottom: var(--space-md);
}

.portfolio-card__tech {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

@media (min-width: 1024px) {
  .portfolio-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ========================================
   Stats Section
======================================== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

.stat-card {
  text-align: center;
  padding: var(--space-xl);
  background-color: var(--color-card);
  border: 2px solid var(--color-border);
}

.stat-card__number {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.stat-card__label {
  color: var(--color-muted-foreground);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.875rem;
}

@media (min-width: 768px) {
  .stats-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ========================================
   Tech Stack
======================================== */
.tech-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-md);
}

.tech-item {
  padding: var(--space-md) var(--space-lg);
  background-color: var(--color-card);
  border: 2px solid var(--color-border);
  font-family: var(--font-mono);
  font-weight: 500;
  transition: box-shadow var(--transition-fast);
}

.tech-item:hover {
  box-shadow: var(--shadow-sm);
}

/* ========================================
   CTA Section
======================================== */
.cta {
  background-color: var(--color-primary);
  color: var(--color-primary-foreground);
  padding: var(--space-4xl) 0;
}

.cta__container {
  text-align: center;
}

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

.cta__text {
  font-size: 1.125rem;
  opacity: 0.8;
  margin-bottom: var(--space-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.cta__actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  justify-content: center;
  align-items: center;
}

@media (min-width: 640px) {
  .cta__actions {
    flex-direction: row;
  }
}

/* ========================================
   Footer
======================================== */
.footer {
  background-color: var(--color-primary);
  color: var(--color-primary-foreground);
  border-top: 4px solid var(--color-border);
  padding: var(--space-3xl) 0;
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

.footer__logo {
  font-size: 1.5rem;
  font-weight: 700;
}

.footer__desc {
  margin-top: var(--space-md);
  opacity: 0.8;
  font-size: 0.875rem;
}

.footer__heading {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-md);
}

.footer__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer__list a {
  font-size: 0.875rem;
  opacity: 0.8;
  transition: opacity var(--transition-fast);
}

.footer__list a:hover {
  opacity: 1;
}

.footer__list--contacts li {
  font-size: 0.875rem;
  opacity: 0.8;
}

.footer__bottom {
  margin-top: var(--space-2xl);
  padding-top: var(--space-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.footer__copyright {
  font-size: 0.875rem;
  opacity: 0.6;
}

.footer__legal {
  font-size: 0.875rem;
  opacity: 0.6;
  transition: opacity var(--transition-fast);
}

.footer__legal:hover {
  opacity: 1;
}

@media (min-width: 768px) {
  .footer__grid {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }
  
  .footer__bottom {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

/* ========================================
   Page Header (for internal pages)
======================================== */
.page-header {
  padding: calc(80px + var(--space-3xl)) 0 var(--space-3xl);
  border-bottom: 4px solid var(--color-border);
}

.page-header__title {
  margin-bottom: var(--space-md);
}

.page-header__subtitle {
  color: var(--color-muted-foreground);
  font-size: 1.125rem;
  max-width: 600px;
}

/* ========================================
   Forms
======================================== */
.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  font-weight: 500;
  margin-bottom: var(--space-sm);
}

.form-label--required::after {
  content: ' *';
  color: #dc2626;
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 0.75rem 1rem;
  font-family: var(--font-sans);
  font-size: 1rem;
  border: 2px solid var(--color-border);
  background-color: var(--color-background);
  transition: box-shadow var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  box-shadow: var(--shadow-sm);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.form-checkbox-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.form-checkbox {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  cursor: pointer;
}

.form-checkbox input {
  width: 20px;
  height: 20px;
  accent-color: var(--color-primary);
}

.form-radio-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.form-radio {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  cursor: pointer;
}

.form-radio input {
  width: 20px;
  height: 20px;
  accent-color: var(--color-primary);
}

.form-hint {
  font-size: 0.875rem;
  color: var(--color-muted-foreground);
  margin-top: var(--space-xs);
}

/* ========================================
   Cards (General)
======================================== */
.card {
  background-color: var(--color-card);
  border: 2px solid var(--color-border);
  padding: var(--space-xl);
}

.card--shadow {
  box-shadow: var(--shadow-sm);
}

/* ========================================
   Filters
======================================== */
.filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
}

.filter-btn {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  border: 2px solid var(--color-border);
  background-color: var(--color-background);
  transition: all var(--transition-fast);
}

.filter-btn:hover {
  background-color: var(--color-secondary);
}

.filter-btn.active {
  background-color: var(--color-primary);
  color: var(--color-primary-foreground);
}

/* ========================================
   Values / Process Grid
======================================== */
.values-grid,
.process-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

.value-card,
.process-card {
  background-color: var(--color-card);
  border: 2px solid var(--color-border);
  padding: var(--space-xl);
}

.value-card__title,
.process-card__title {
  margin-bottom: var(--space-sm);
}

.value-card__text,
.process-card__text {
  color: var(--color-muted-foreground);
}

.process-card__number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: var(--color-primary);
  color: var(--color-primary-foreground);
  font-weight: 700;
  margin-bottom: var(--space-md);
}

@media (min-width: 640px) {
  .values-grid,
  .process-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .values-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .process-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ========================================
   Contact Info
======================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

.contact-card {
  background-color: var(--color-card);
  border: 2px solid var(--color-border);
  padding: var(--space-xl);
}

.contact-card__icon {
  margin-bottom: var(--space-md);
}

.contact-card__title {
  margin-bottom: var(--space-sm);
}

.contact-card__text {
  color: var(--color-muted-foreground);
}

.contact-card__link {
  color: var(--color-foreground);
  font-weight: 500;
}

@media (min-width: 768px) {
  .contact-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ========================================
   Request Form Modes
======================================== */
.form-mode-switcher {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
}

.mode-btn {
  flex: 1;
  padding: var(--space-md);
  font-weight: 500;
  border: 2px solid var(--color-border);
  background-color: var(--color-background);
  transition: all var(--transition-fast);
}

.mode-btn.active {
  background-color: var(--color-primary);
  color: var(--color-primary-foreground);
}

.extended-fields {
  display: none;
}

.extended-fields.active {
  display: block;
}

/* ========================================
   Success Message
======================================== */
.success-message {
  display: none;
  text-align: center;
  padding: var(--space-3xl);
  background-color: var(--color-secondary);
  border: 2px solid var(--color-border);
}

.success-message.active {
  display: block;
}

.success-message__icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-lg);
  background-color: var(--color-primary);
  color: var(--color-primary-foreground);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
}

.success-message__title {
  margin-bottom: var(--space-md);
}

.success-message__text {
  color: var(--color-muted-foreground);
  margin-bottom: var(--space-lg);
}

/* ========================================
   Utilities
======================================== */
.text-center { text-align: center; }
.text-muted { color: var(--color-muted-foreground); }
.mb-0 { margin-bottom: 0; }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

/* Hidden but accessible */
.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;
}