/* ==========================================================================
   Resets and Base HTML
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -moz-osx-font-smoothing: grayscale;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text-primary);
  /* Fundo gradiente parallax de alto padrão: transição sutil de branco, cinza-gelo e areia */
  background: linear-gradient(135deg, #FFFFFF 0%, #F5F7FA 35%, #EEF2F6 70%, #FAF9F6 100%);
  background-attachment: fixed;
  line-height: 1.65;
  overflow-x: hidden;
}

/* Custom Scrollbar for Premium Feel */
::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-surface);
}

::-webkit-scrollbar-thumb {
  background: var(--color-text-light);
  border-radius: var(--radius-pill);
  border: 2px solid var(--color-bg-surface);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-accent);
}

/* ==========================================================================
   Typography Base
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  color: var(--color-primary);
  font-weight: 600;
  line-height: 1.25;
  margin-bottom: var(--spacing-sm);
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem); /* Responsive fluid font sizing */
  font-weight: 700;
}

h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  position: relative;
}

h3 {
  font-size: clamp(1.35rem, 2.5vw, 1.75rem);
}

h4 {
  font-size: 1.25rem;
}

p {
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
}

p.lead {
  font-size: clamp(1.1rem, 2vw, 1.25rem);
  font-weight: 300;
  line-height: 1.75;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: var(--transition-fast);
}

/* ==========================================================================
   Layout Containers
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--spacing-md);
  padding-right: var(--spacing-md);
}

.container-narrow {
  width: 100%;
  max-width: var(--container-width-narrow);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--spacing-md);
  padding-right: var(--spacing-md);
}

.section {
  padding-top: var(--spacing-xxl);
  padding-bottom: var(--spacing-xxl);
  background-color: var(--color-bg-base); /* Fundo branco sólido por padrão */
  position: relative;
  z-index: 1;
}

@media (min-width: 768px) {
  .section {
    padding-top: var(--spacing-section);
    padding-bottom: var(--spacing-section);
  }
}

.section-bg-surface {
  background-color: var(--color-bg-surface) !important; /* Fundo cinza clínico suave para alternação */
}

.section-bg-primary {
  background-color: var(--color-primary);
  color: var(--color-text-white);
}

.section-bg-primary h1,
.section-bg-primary h2,
.section-bg-primary h3,
.section-bg-primary h4,
.section-bg-primary p {
  color: var(--color-text-white);
}

/* ==========================================================================
   Utility Classes & Grid Helpers
   ========================================================================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.d-flex { display: flex; }
.flex-column { flex-direction: column; }
.align-center { align-items: center; }
.justify-center { justify-content: center; }

.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.grid-2 {
  grid-template-columns: 1fr;
}

.grid-3 {
  grid-template-columns: 1fr;
}

.grid-4 {
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

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

.divider {
  width: 60px;
  height: 3px;
  background-color: var(--color-accent);
  margin: var(--spacing-md) 0;
}

.divider.center {
  margin: var(--spacing-md) auto;
}

/* Screen Reader Only Utility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}


/* Accessibility: Reduced Motion */
@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;
  }
}