/* ============================================
   CSS VARIABLES - DESIGN SYSTEM
   ============================================ */

:root {
  /* COLORS - PRIMARY PALETTE */
  --color-primary: #2c7da0;
  --color-primary-light: #458fbe;
  --color-primary-dark: #1b5587;
  
  /* COLORS - ACCENT & ACTIONS */
  --color-accent: #26a335;
  --color-accent-light: #4cb346;
  --color-accent-dark: #1a7a29;
  
  /* COLORS - NEUTRAL */
  --color-bg-light: #f8f9fa;
  --color-bg-white: #ffffff;
  --color-text-primary: #212529;
  --color-text-secondary: #6c757d;
  --color-border: #dee2e6;
  
  /* COLORS - FEEDBACK */
  --color-success: #26a335;
  --color-warning: #ffc107;
  --color-error: #dc3545;
  
  /* SPACING */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  
  /* TYPOGRAPHY */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-size-base: 1rem;
  --font-size-sm: 0.875rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 1.875rem;
  --font-size-3xl: 2.25rem;
  
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* LINE HEIGHT */
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  
  /* BORDER RADIUS */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;
  
  /* SHADOWS */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* TRANSITIONS */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 300ms ease-in-out;
  --transition-slow: 500ms ease-in-out;
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

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

/* ============================================
   TYPOGRAPHY
   ============================================ */

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: var(--font-size-3xl);
}

h2 {
  font-size: var(--font-size-2xl);
}

h3 {
  font-size: var(--font-size-xl);
}

p {
  margin-bottom: var(--spacing-md);
}

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

a:hover,
a:focus-visible {
  color: var(--color-primary-dark);
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

small {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  text-align: center;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.btn--primary {
  background-color: var(--color-primary);
  color: var(--color-bg-white);
  box-shadow: var(--shadow-md);
}

.btn--primary:not(:disabled):hover {
  background-color: var(--color-primary-dark);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.btn--primary:disabled {
  background-color: var(--color-text-secondary);
  cursor: not-allowed;
  opacity: 0.7;
}

.btn--secondary {
  background-color: var(--color-bg-light);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

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

/* ============================================
   HEADER
   ============================================ */

header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-bg-white);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.header__container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-md) var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header__logo {
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo__image {
  width: 64px;
  height: 64px;
  display: block;
}

.logo__icon {
  color: var(--color-primary);
  flex-shrink: 0;
}

.header__title {
  font-size: var(--font-size-lg);
}

.header__nav {
  margin-left: auto;
}

.nav__list {
  list-style: none;
  display: flex;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
}

.nav__link {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.nav__link:hover,
.nav__link:focus-visible {
  color: var(--color-primary);
}

/* Mobile menu - Stack nav if needed */
@media (max-width: 640px) {
  .header__container {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  .header__nav {
    margin-left: 0;
    width: 100%;
  }

  .nav__list {
    justify-content: center;
    gap: var(--spacing-md);
  }
}

/* ============================================
   MAIN & SECTIONS
   ============================================ */

main {
  flex: 1;
}

.section {
  padding: var(--spacing-2xl) var(--spacing-md);
}

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

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

.section__container {
  max-width: 1200px;
  margin: 0 auto;
}

.section__title {
  text-align: center;
  margin-bottom: var(--spacing-lg);
  color: var(--color-primary);
}

.section__description {
  text-align: center;
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: var(--spacing-2xl);
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero {
  background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-primary) 100%);
  color: var(--color-bg-white);
  padding: var(--spacing-2xl) var(--spacing-md);
  text-align: center;
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero__container {
  max-width: 700px;
  margin: 0 auto;
}

.hero__title {
  color: var(--color-bg-white);
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-lg);
  line-height: var(--line-height-relaxed);
}

.hero__description {
  color: rgba(255, 255, 255, 0.95);
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-xl);
  line-height: var(--line-height-relaxed);
}

.hero__footnote {
  color: rgba(255, 255, 255, 0.85);
  margin-top: var(--spacing-lg);
}

.hero__footnote small {
  color: var(--color-bg-white);
}

@media (max-width: 640px) {
  .hero {
    min-height: auto;
    padding: var(--spacing-xl) var(--spacing-md);
  }

  .hero__title {
    font-size: var(--font-size-2xl);
  }

  .hero__description {
    font-size: var(--font-size-base);
  }
}

/* ============================================
   PROBLEM CARDS
   ============================================ */

.problems__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  list-style: none;
}

.problem-card {
  background-color: var(--color-bg-white);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
}

.problem-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.problem-card__icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  display: block;
}

.problem-card__title {
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.problem-card__text {
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: 0;
}

/* ============================================
   SOLUTION CARDS
   ============================================ */

.solutions__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  list-style: none;
}

.solution-card {
  background-color: var(--color-bg-light);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  border-left: 4px solid var(--color-accent);
  position: relative;
  transition: all var(--transition-base);
}

.solution-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateX(4px);
}

.solution-card__number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: var(--color-accent);
  color: var(--color-bg-white);
  border-radius: var(--radius-full);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-md);
}

.solution-card__title {
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.solution-card__text {
  color: var(--color-text-secondary);
  margin-bottom: 0;
  line-height: var(--line-height-relaxed);
}

/* ============================================
   STEPS - COMO FUNCIONA
   ============================================ */

.steps__container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  list-style: none;
}

.step-card {
  background-color: var(--color-bg-white);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  max-width: 200px;
  text-align: center;
  flex-shrink: 0;
  transition: all var(--transition-base);
}

.step-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.step-card__number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  background-color: var(--color-primary);
  color: var(--color-bg-white);
  border-radius: var(--radius-full);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-md);
}

.step-card__title {
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.step-card__text {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  margin-bottom: 0;
  line-height: var(--line-height-relaxed);
}

.step-card__arrow {
  color: var(--color-primary);
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
}

@media (max-width: 768px) {
  .steps__container {
    gap: var(--spacing-sm);
  }

  .step-card {
    max-width: 150px;
    padding: var(--spacing-md);
  }

  .step-card__number {
    width: 40px;
    height: 40px;
    font-size: var(--font-size-lg);
  }

  .step-card__arrow {
    transform: rotate(90deg);
  }
}

/* ============================================
   STATUS CARD
   ============================================ */

.status-card {
  background: linear-gradient(135deg, rgba(44, 125, 160, 0.1) 0%, rgba(38, 163, 53, 0.1) 100%);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-2xl);
  text-align: center;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.status-card__icon {
  font-size: 4rem;
  margin-bottom: var(--spacing-md);
  display: block;
}

.status-card__title {
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

.status-card__text {
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-lg);
}

.status-card__highlight {
  color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
  margin-bottom: 0;
}

/* ============================================
   FOOTER
   ============================================ */

footer {
  background-color: var(--color-text-primary);
  color: var(--color-bg-white);
  padding: var(--spacing-xl) var(--spacing-md);
  margin-top: var(--spacing-2xl);
  text-align: center;
}

.footer__container {
  max-width: 1200px;
  margin: 0 auto;
}

.footer__copyright {
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-sm);
}

.footer__tagline {
  color: rgba(255, 255, 255, 0.85);
  font-size: var(--font-size-sm);
  margin-bottom: 0;
  font-style: italic;
}

.footer__copyright strong {
  color: var(--color-accent);
  font-weight: var(--font-weight-bold);
}

/* ============================================
   ACCESSIBILITY & UTILITIES
   ============================================ */

/* Focus visible para navegação */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Skip link para acessibilidade */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background-color: var(--color-primary);
  color: var(--color-bg-white);
  padding: var(--spacing-sm);
  text-decoration: none;
  border-radius: var(--radius-md);
  z-index: 1000;
}

.skip-link:focus {
  top: 0;
}

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

/* ============================================
   RESPONSIVE - MOBILE FIRST
   ============================================ */

@media (max-width: 640px) {
  :root {
    --spacing-xl: 2rem;
    --spacing-2xl: 2.5rem;
  }

  .section {
    padding: var(--spacing-xl) var(--spacing-md);
  }

  .section__title {
    font-size: var(--font-size-2xl);
  }

  .section__description {
    font-size: var(--font-size-base);
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: var(--font-size-2xl);
  }

  h2 {
    font-size: var(--font-size-xl);
  }

  .btn {
    width: 100%;
  }

  .solutions__grid,
  .problems__grid {
    grid-template-columns: 1fr;
  }

  .status-card {
    padding: var(--spacing-lg);
  }

  .status-card__icon {
    font-size: 3rem;
  }
}

/* ============================================
   PRINT STYLES
   ============================================ */

@media print {
  header,
  footer {
    display: none;
  }

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

  a {
    text-decoration: underline;
  }

  .btn:disabled {
    display: none;
  }
}