/* ========================================
   BrewIT s.r.o. - Design System: Architectural Precision
   ======================================== */

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

:root {
  /* Brand */
  --primary: #003fb1;
  --primary-container: #1a56db;
  --on-primary: #ffffff;

  /* Surfaces — Tonal Layering */
  --surface: #f8f9ff;
  --surface-container-lowest: #ffffff;
  --surface-container-low: #f0f1fa;
  --surface-container: #eaebf4;
  --surface-container-high: #e4e5ef;
  --surface-container-highest: #dddee9;

  /* Text */
  --on-surface: #1a1b2e;
  --on-surface-variant: #434654;
  --outline-variant: #74778b;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;
  --space-4xl: 8rem;

  /* Radius — no borders, generous curves */
  --radius-sm: 0.125rem;
  --radius-md: 0.375rem;
  --radius-xl: 0.75rem;

  /* Layout */
  --font-main: 'Inter', system-ui, -apple-system, sans-serif;
  --max-width: 1120px;
  --header-height: 72px;
}

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

body {
  font-family: var(--font-main);
  color: var(--on-surface-variant);
  background: var(--surface);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

/* --- Skip Link (A11y) --- */
.skip-link {
  position: absolute;
  top: 0;
  left: 0;
  transform: translateY(-120%);
  padding: 12px 20px;
  background: var(--primary);
  color: var(--on-primary);
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: 0 0 var(--radius-md) 0;
  z-index: 1000;
  transition: transform 0.2s;
}

.skip-link:focus {
  transform: translateY(0);
  outline: none;
}

/* --- Container --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Header — Glassmorphism --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(248, 249, 255, 0.8);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  z-index: 100;
  transition: box-shadow 0.4s;
}

.header.scrolled {
  box-shadow: 0 4px 32px rgba(26, 27, 46, 0.06);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--on-surface);
  letter-spacing: -0.02em;
}

.logo span {
  color: var(--primary);
}

.nav {
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--on-surface-variant);
  letter-spacing: 0.01em;
  transition: color 0.2s;
}

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

.lang-switch {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 6px 16px;
  background: var(--surface-container-high);
  border-radius: var(--radius-md);
  transition: background 0.2s, color 0.2s;
}

.lang-switch:hover {
  background: var(--surface-container-highest);
  color: var(--primary);
}

/* Mobile menu button */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--on-surface);
  margin: 5px 0;
  transition: transform 0.3s, opacity 0.3s;
}

.menu-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.menu-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --- Hero — Asymmetric Layout --- */
.hero {
  padding: 180px 0 120px;
}

.hero-content {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: var(--space-2xl);
  align-items: end;
}

.hero-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--primary);
  background: rgba(0, 63, 177, 0.08);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-md);
}

.hero h1 {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  font-weight: 800;
  color: var(--on-surface);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-lg);
}

.hero-right p {
  font-size: 1.05rem;
  color: var(--on-surface-variant);
  line-height: 1.8;
  margin-bottom: var(--space-lg);
}

.hero-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: var(--space-md);
}

.hero-chip {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--on-surface-variant);
  background: var(--surface-container-high);
  padding: 5px 11px;
  border-radius: var(--radius-sm);
}

.btn {
  display: inline-block;
  padding: 14px 32px;
  font-size: 0.938rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: transform 0.2s, box-shadow 0.3s;
  cursor: pointer;
  border: none;
  font-family: var(--font-main);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-container));
  color: var(--on-primary);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 32px rgba(0, 63, 177, 0.2);
}

.btn-secondary {
  background: var(--surface-container-high);
  color: var(--primary);
}

.btn-secondary:hover {
  background: var(--surface-container-highest);
}

/* --- Services — Tonal Layering --- */
.services {
  padding: var(--space-4xl) 0;
  background: var(--surface-container-low);
}

.section-header {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: end;
  margin-bottom: var(--space-3xl);
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: var(--space-sm);
}

.section-header h2 {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 800;
  color: var(--on-surface);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.section-header p {
  color: var(--on-surface-variant);
  font-size: 1.05rem;
  line-height: 1.7;
  align-self: end;
}

.services-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-xl);
}

.service-pillar {
  position: relative;
  padding-top: var(--space-sm);
}

.service-pillar::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 28px;
  height: 2px;
  background: var(--primary);
  border-radius: var(--radius-sm);
}

.service-pillar h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--on-surface);
  margin-bottom: var(--space-xs);
  letter-spacing: -0.01em;
}

.service-pillar p {
  color: var(--on-surface-variant);
  font-size: 0.875rem;
  line-height: 1.65;
}

/* Service icon (used by Use Cases) */
.service-icon {
  width: 52px;
  height: 52px;
  background: rgba(0, 63, 177, 0.07);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
}

.service-icon svg {
  width: 24px;
  height: 24px;
  stroke: var(--primary);
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* --- Use Cases — Tonal Layering --- */
.use-cases {
  padding: var(--space-4xl) 0;
  background: var(--surface);
}

.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.use-case-card {
  background: var(--surface-container-lowest);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  transition: box-shadow 0.3s, transform 0.3s;
}

.use-case-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 40px rgba(26, 27, 46, 0.06);
}

.use-case-card h3 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--on-surface);
  margin-bottom: var(--space-xs);
  letter-spacing: -0.01em;
}

.use-case-card p {
  color: var(--on-surface-variant);
  font-size: 0.938rem;
  line-height: 1.7;
}

/* --- Process — Horizontal Flow --- */
.process {
  padding: var(--space-4xl) 0;
  background: var(--surface-container-low);
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
  position: relative;
}

.process-step {
  background: var(--surface-container-lowest);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  position: relative;
}

.process-number {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--primary);
  background: rgba(0, 63, 177, 0.08);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-md);
  font-variant-numeric: tabular-nums;
}

.process-step h3 {
  font-size: 1.063rem;
  font-weight: 700;
  color: var(--on-surface);
  margin-bottom: var(--space-xs);
  letter-spacing: -0.01em;
}

.process-step p {
  color: var(--on-surface-variant);
  font-size: 0.875rem;
  line-height: 1.65;
}

/* --- Technologies — Integration Chips --- */
.tech {
  padding: var(--space-4xl) 0;
  background: var(--surface);
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.tech-category {
  background: var(--surface-container-lowest);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
}

.tech-category h3 {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: var(--space-md);
}

.tech-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tech-chip {
  display: inline-block;
  font-size: 0.813rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--on-surface-variant);
  background: var(--surface-container-highest);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
}

.tech-note {
  margin-top: var(--space-lg);
  font-size: 0.875rem;
  color: var(--outline-variant);
  font-style: italic;
}

/* --- About — Asymmetric Layout --- */
.about {
  padding: var(--space-4xl) 0;
  background: var(--surface-container-low);
}

.about-content {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: var(--space-3xl);
  align-items: start;
}

.about-left h2 {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 800;
  color: var(--on-surface);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.about-right p {
  color: var(--on-surface-variant);
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: var(--space-md);
}

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

.stat-inline {
  font-weight: 700;
  color: var(--primary);
  letter-spacing: -0.005em;
}

/* --- Contact — Tonal Depth --- */
.contact {
  padding: var(--space-4xl) 0;
}

.contact-wrapper {
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: var(--space-3xl);
  align-items: start;
}

.contact-info h2 {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 800;
  color: var(--on-surface);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
}

.contact-info > p {
  color: var(--on-surface-variant);
  margin-bottom: var(--space-lg);
  line-height: 1.7;
  font-size: 1rem;
}

.contact-detail {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: var(--space-md);
  color: var(--on-surface);
  font-size: 0.938rem;
  font-weight: 500;
}

.contact-detail svg {
  width: 20px;
  height: 20px;
  stroke: var(--primary);
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex-shrink: 0;
}

/* --- Billing Info — Editorial Data Display --- */
.billing {
  margin-top: var(--space-sm);
}

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

.billing-name {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--on-surface);
  letter-spacing: -0.015em;
  margin-bottom: 6px;
}

.billing-address {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  color: var(--on-surface-variant);
  font-size: 0.875rem;
  line-height: 1.5;
}

.billing-address svg {
  width: 16px;
  height: 16px;
  stroke: var(--primary);
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex-shrink: 0;
  margin-top: 3px;
}

.billing-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md) var(--space-lg);
}

.billing-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.billing-row--full {
  grid-column: 1 / -1;
}

.billing-label {
  font-size: 0.688rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--outline-variant);
}

.billing-value {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--on-surface);
  line-height: 1.5;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.005em;
}

.contact-form {
  background: var(--surface-container-low);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
}

.form-error {
  margin-bottom: var(--space-sm);
  padding: 10px 14px;
  background: rgba(220, 38, 38, 0.08);
  color: #b91c1c;
  font-size: 0.875rem;
  border-radius: var(--radius-md);
}

.form-success {
  background: var(--surface-container-low);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
}

.form-success h3 {
  font-size: 1.375rem;
  font-weight: 800;
  color: var(--on-surface);
  letter-spacing: -0.02em;
  margin: var(--space-xs) 0 var(--space-sm);
}

.form-success p {
  color: var(--on-surface-variant);
  font-size: 0.975rem;
  line-height: 1.7;
}

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

.form-group label {
  display: block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--on-surface);
  margin-bottom: var(--space-xs);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 0;
  font-size: 0.95rem;
  font-family: var(--font-main);
  border: none;
  border-bottom: 2px solid var(--surface-container-highest);
  border-radius: 0;
  background: transparent;
  color: var(--on-surface);
  transition: border-color 0.3s;
  outline: none;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--outline-variant);
}

.form-group input:focus,
.form-group textarea:focus {
  border-bottom-color: var(--primary);
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

.contact-form .btn {
  width: 100%;
  margin-top: var(--space-sm);
}

/* --- Thank You — Confirmation Page --- */
.thanks {
  padding: 200px 0 var(--space-4xl);
  min-height: calc(100vh - var(--header-height));
  display: flex;
  align-items: center;
}

.thanks-content {
  max-width: 640px;
}

.thanks-content h1 {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  color: var(--on-surface);
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: var(--space-md);
}

.thanks-content p {
  font-size: 1.05rem;
  color: var(--on-surface-variant);
  line-height: 1.7;
  margin-bottom: var(--space-lg);
}

/* --- Footer — Subtle Separation --- */
.footer {
  padding: var(--space-2xl) 0;
  background: var(--surface-container-low);
  text-align: center;
}

.footer p {
  color: var(--on-surface-variant);
  font-size: 0.813rem;
  letter-spacing: 0.01em;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }

  .nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: rgba(248, 249, 255, 0.95);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    flex-direction: column;
    padding: var(--space-lg);
    gap: var(--space-md);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.3s, opacity 0.3s;
  }

  .nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .hero {
    padding: 140px 0 80px;
  }

  .hero-content {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .hero-right {
    max-width: 480px;
  }

  .section-header {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }

  .services-strip {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .contact-wrapper {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .use-cases-grid {
    grid-template-columns: 1fr;
  }

  .process-steps {
    grid-template-columns: 1fr;
  }

  .tech-grid {
    grid-template-columns: 1fr;
  }

  .about-content {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .services-strip {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-xl);
  }

  .process-steps {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.875rem;
  }

  .contact-form {
    padding: var(--space-lg);
  }

  .billing-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .use-case-card,
  .process-step,
  .tech-category {
    padding: var(--space-lg);
  }
}

/* --- Reduced Motion (A11y) --- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}