/* ==========================================================================
   Global CSS — Biuro Rachunkowe Wolumen
   Design: Corporate Premium | Paradigm: Corporate Modern
   Fonts: Plus Jakarta Sans (heading) + Inter (body)
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties (Design Tokens)
   -------------------------------------------------------------------------- */
:root {
  /* Colors */
  --color-primary: #0A2E1C;
  --color-secondary: #10B981;
  --color-accent: #9B7C2E;
  --color-highlight: #D1FAE5;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F8FAF9;
  --color-bg-dark: #0A2E1C;
  --color-text: #1A1A2E;
  --color-text-light: #4A5568;
  --color-text-on-dark: #F8FAF9;
  --color-border: #E2E8F0;

  /* Typography */
  --font-heading: 'Plus Jakarta Sans', sans-serif;
  --font-body: 'Inter', sans-serif;

  /* Font sizes */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.75rem;

  /* 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;

  /* Border Radius */
  --border-radius-sm: 0.25rem;
  --border-radius-md: 0.5rem;
  --border-radius-lg: 0.75rem;
  --border-radius-xl: 1rem;
  --border-radius-2xl: 1.5rem;
  --border-radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
  --shadow-glow: 0 0 20px rgba(16, 185, 129, 0.3);

  /* Transitions */
  --transition-base: 0.3s ease;
  --transition-slow: 0.6s ease;
  --transition-fast: 0.15s ease;

  /* Layout */
  --container-max: 1200px;
  --container-padding: clamp(1rem, 4vw, 2rem);
  --nav-height: 80px;
}

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

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

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

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

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

ul,
ol {
  list-style: none;
}

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

input,
textarea,
select {
  font-family: inherit;
  font-size: inherit;
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
}

h1 { font-size: clamp(2rem, 5vw, var(--text-5xl)); }
h2 { font-size: clamp(1.5rem, 3.5vw, var(--text-4xl)); }
h3 { font-size: clamp(1.25rem, 2.5vw, var(--text-3xl)); }
h4 { font-size: clamp(1.125rem, 2vw, var(--text-2xl)); }
h5 { font-size: var(--text-xl); }
h6 { font-size: var(--text-lg); }

p {
  line-height: 1.7;
  color: var(--color-text-light);
}

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

.section {
  padding: var(--space-4xl) 0;
}

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

/* --------------------------------------------------------------------------
   Section Background Variants
   -------------------------------------------------------------------------- */
.section-light {
  background-color: var(--color-bg);
}

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

.section-dark {
  background-color: var(--color-bg-dark);
  color: var(--color-text-on-dark);
}

.section-dark h1,
.section-dark h2,
.section-dark h3,
.section-dark h4,
.section-dark h5,
.section-dark h6 {
  color: var(--color-text-on-dark);
}

.section-dark p {
  color: rgba(248, 250, 249, 0.8);
}

.section-gradient {
  background: linear-gradient(135deg, var(--color-primary) 0%, #0F4A2E 50%, #10B981 100%);
  color: var(--color-text-on-dark);
}

.section-gradient h1,
.section-gradient h2,
.section-gradient h3,
.section-gradient h4 {
  color: #FFFFFF;
}

.section-gradient p {
  color: rgba(255, 255, 255, 0.85);
}

/* --------------------------------------------------------------------------
   Button Base Classes
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: 600;
  line-height: 1.2;
  border-radius: var(--border-radius-md);
  transition: all var(--transition-base);
  cursor: pointer;
  white-space: nowrap;
  text-decoration: none;
}

.btn-primary {
  background-color: var(--color-secondary);
  color: #FFFFFF;
  border: 2px solid var(--color-secondary);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background-color: #0DA271;
  border-color: #0DA271;
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

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

.btn-secondary {
  background-color: var(--color-primary);
  color: var(--color-text-on-dark);
  border: 2px solid var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background-color: #0F3D26;
  border-color: #0F3D26;
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

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

.btn-outline:hover {
  background-color: var(--color-secondary);
  color: #FFFFFF;
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

.btn-outline-light {
  background-color: transparent;
  color: var(--color-text-on-dark);
  border: 2px solid rgba(248, 250, 249, 0.6);
}

.btn-outline-light:hover {
  background-color: rgba(248, 250, 249, 0.1);
  border-color: var(--color-text-on-dark);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 1rem 2.25rem;
  font-size: var(--text-lg);
}

.btn-sm {
  padding: 0.5rem 1.25rem;
  font-size: var(--text-sm);
}

/* --------------------------------------------------------------------------
   Card Base Classes
   -------------------------------------------------------------------------- */
.card-elevated {
  background: var(--color-bg);
  border-radius: var(--border-radius-xl);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  border: 1px solid var(--color-border);
  overflow: hidden;
}

.card-elevated:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-secondary);
  box-shadow: var(--shadow-glow);
}

.card-flat {
  background: var(--color-bg-alt);
  border-radius: var(--border-radius-xl);
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.card-flat:hover {
  border-color: var(--color-secondary);
  background: var(--color-bg);
  box-shadow: var(--shadow-sm);
}

/* --------------------------------------------------------------------------
   Animation: Scroll Reveal
   -------------------------------------------------------------------------- */

/* Animation: .reveal elements animated via IntersectionObserver */
/* Counter: [data-counter] elements animated via IntersectionObserver */
/* Accordion: .accordion-item toggled via click handler */

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* Staggered reveal children */
.reveal-stagger > *:nth-child(1) { transition-delay: 0s; }
.reveal-stagger > *:nth-child(2) { transition-delay: 0.1s; }
.reveal-stagger > *:nth-child(3) { transition-delay: 0.2s; }
.reveal-stagger > *:nth-child(4) { transition-delay: 0.3s; }
.reveal-stagger > *:nth-child(5) { transition-delay: 0.4s; }
.reveal-stagger > *:nth-child(6) { transition-delay: 0.5s; }

/* --------------------------------------------------------------------------
   Animation: Accordion
   -------------------------------------------------------------------------- */
.accordion-item {
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  transition: border-color var(--transition-base);
}

.accordion-item.open {
  border-color: var(--color-secondary);
}

.accordion-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 1.25rem 1.5rem;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: var(--text-lg);
  color: var(--color-text);
  background: var(--color-bg);
  text-align: left;
  cursor: pointer;
  transition: color var(--transition-base), background var(--transition-base);
}

.accordion-item.open .accordion-trigger {
  color: var(--color-secondary);
  background: var(--color-bg-alt);
}

.accordion-trigger-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-highlight);
  color: var(--color-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-base);
}

.accordion-item.open .accordion-trigger-icon {
  transform: rotate(45deg);
  background: var(--color-secondary);
  color: #FFFFFF;
}

.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}

.accordion-content-inner {
  padding: 0 1.5rem 1.5rem;
}

/* --------------------------------------------------------------------------
   Form Styles
   -------------------------------------------------------------------------- */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.form-label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: var(--text-base);
  color: var(--color-text);
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: var(--border-radius-md);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
  outline: none;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  border-color: var(--color-secondary);
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.15);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-text-light);
  opacity: 0.7;
}

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

.form-message {
  padding: 0.75rem 1rem;
  border-radius: var(--border-radius-md);
  font-size: var(--text-sm);
  font-weight: 500;
  display: none;
}

.form-message:not(:empty) {
  display: block;
}

.form-message--success {
  background: var(--color-highlight);
  color: #065F46;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.form-message--error {
  background: #FEE2E2;
  color: #991B1B;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

/* --------------------------------------------------------------------------
   Section Headers
   -------------------------------------------------------------------------- */
.section-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.section-eyebrow {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-secondary);
  margin-bottom: 0.75rem;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: 1rem;
  line-height: 1.2;
}

.section-title--light {
  color: var(--color-text-on-dark);
}

.section-subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-light);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.7;
}

.section-subtitle--light {
  color: rgba(248, 250, 249, 0.8);
}

.title-underline {
  display: inline-block;
  position: relative;
}

.title-underline::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 60%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-secondary), var(--color-accent));
  border-radius: 2px;
}

/* --------------------------------------------------------------------------
   Icon Wrapper
   -------------------------------------------------------------------------- */
.icon-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: var(--border-radius-lg);
  background: var(--color-highlight);
  color: var(--color-secondary);
  flex-shrink: 0;
}

.icon-wrapper--lg {
  width: 72px;
  height: 72px;
  border-radius: var(--border-radius-xl);
}

.icon-wrapper--dark {
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-secondary);
}

/* --------------------------------------------------------------------------
   Badge / Tag
   -------------------------------------------------------------------------- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.75rem;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border-radius: var(--border-radius-full);
}

.badge-primary {
  background: var(--color-highlight);
  color: var(--color-secondary);
}

.badge-accent {
  background: rgba(155, 124, 46, 0.15);
  color: var(--color-accent);
}

.badge-featured {
  background: var(--color-secondary);
  color: #FFFFFF;
}

/* --------------------------------------------------------------------------
   Responsive Breakpoints
   -------------------------------------------------------------------------- */

/* Mobile: < 640px — default styles above */

/* Tablet: >= 768px */
@media (min-width: 768px) {
  :root {
    --container-padding: 2rem;
  }
}

/* Desktop: >= 1024px */
@media (min-width: 1024px) {
  :root {
    --container-padding: 2.5rem;
  }
}

/* Wide: >= 1280px */
@media (min-width: 1280px) {
  :root {
    --container-padding: 3rem;
  }
}

/* --------------------------------------------------------------------------
   Accessibility
   -------------------------------------------------------------------------- */
:focus-visible {
  outline: 2px solid var(--color-secondary);
  outline-offset: 3px;
}

.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;
}

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

  .reveal {
    opacity: 1;
    transform: none;
  }
}