/* ============================================
   XPERTS LTDA - Modern CSS (2026)
   Squarespace-inspired design
   ============================================ */

/* ============================================
   CSS VARIABLES
   ============================================ */
:root {
  /* Primary Colors */
  --color-primary: #003366;
  --color-primary-light: #0055aa;
  --color-primary-dark: #001a33;
  --color-accent: #ff9900;
  --color-accent-hover: #cc7700;

  /* Neutral Colors */
  --color-text: #222222;
  --color-text-light: #555555;
  --color-text-muted: #888888;
  --color-bg: #ffffff;
  --color-bg-light: #f8f9fa;
  --color-bg-gray: #f5f5f5;
  --color-border: #e0e0e0;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #003366 0%, #0055aa 100%);
  --gradient-accent: linear-gradient(135deg, #ff9900 0%, #ffb347 100%);
  --gradient-hero: linear-gradient(135deg, rgba(0, 51, 102, 0.95) 0%, rgba(0, 85, 170, 0.9) 100%);

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-xxl: 4rem;

  /* Typography */
  --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-heading: 'Georgia', 'Times New Roman', serif;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
  --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.2);

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

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

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-lg);
}

h2 {
  font-size: 2rem;
  margin-bottom: var(--spacing-md);
}

h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
}

h4 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
}

p {
  margin-bottom: var(--spacing-md);
  line-height: 1.7;
}

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

a:hover {
  color: var(--color-accent);
}

/* ============================================
   TOP BAR
   ============================================ */
.top-bar {
  background: var(--gradient-primary);
  color: white;
  padding: var(--spacing-sm) 0;
  box-shadow: var(--shadow-sm);
}

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

.top-bar-nav {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
}

.top-bar-nav a {
  color: white;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: opacity var(--transition-fast);
}

.top-bar-nav a:hover {
  opacity: 0.8;
}

.top-bar-nav svg {
  width: 16px;
  height: 16px;
}

/* ============================================
   HEADER
   ============================================ */
.site-header {
  background: white;
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-md);
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--spacing-lg);
  align-items: center;
}

.logo-section {
  text-align: center;
}

.logo-section img {
  max-width: 100%;
  height: auto;
  transition: transform var(--transition-normal);
}

.logo-section img:hover {
  transform: scale(1.05);
}

.banner-section {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.banner-section img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform var(--transition-slow);
}

.banner-section:hover img {
  transform: scale(1.05);
}

/* ============================================
   MAIN LAYOUT
   ============================================ */
.main-container {
  max-width: 1200px;
  margin: var(--spacing-xl) auto;
  padding: 0 var(--spacing-md);
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--spacing-xl);
}

/* ============================================
   SIDEBAR NAVIGATION
   ============================================ */
.sidebar {
  position: sticky;
  top: 120px;
  height: fit-content;
}

.nav-card {
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  margin-bottom: var(--spacing-md);
  transition: box-shadow var(--transition-normal), transform var(--transition-normal);
}

.nav-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.nav-card-header {
  background: var(--gradient-primary);
  color: white;
  padding: var(--spacing-md);
  font-weight: 600;
  text-align: center;
  font-size: 1.1rem;
}

.nav-card-body {
  padding: var(--spacing-sm);
}

.nav-item {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast), padding-left var(--transition-fast);
  font-size: 0.95rem;
}

.nav-item:hover {
  background-color: var(--color-bg-light);
  padding-left: 1.5rem;
  color: var(--color-primary);
}

.nav-item.active {
  background: linear-gradient(90deg, rgba(0, 51, 102, 0.1) 0%, transparent 100%);
  color: var(--color-primary);
  font-weight: 600;
  border-left: 3px solid var(--color-accent);
}

.nav-subitems {
  margin-left: var(--spacing-md);
  margin-top: var(--spacing-xs);
}

.nav-subitem {
  display: block;
  padding: var(--spacing-xs) var(--spacing-md);
  color: var(--color-text-light);
  font-size: 0.9rem;
  border-left: 2px solid var(--color-border);
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

.nav-subitem:hover {
  border-color: var(--color-accent);
  color: var(--color-primary);
}

/* ============================================
   CONTENT AREA
   ============================================ */
.content {
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--spacing-xl);
  min-height: 60vh;
}

.content article {
  max-width: 800px;
}

.content h1 {
  color: var(--color-primary);
  border-bottom: 3px solid var(--color-accent);
  padding-bottom: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

.content h2 {
  margin-top: var(--spacing-xl);
  color: var(--color-primary-light);
}

.content p {
  text-align: justify;
  color: var(--color-text);
  line-height: 1.8;
}

.content ul, .content ol {
  margin-left: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.content li {
  margin-bottom: var(--spacing-xs);
  line-height: 1.7;
}

.content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  margin: var(--spacing-lg) 0;
}

/* ============================================
   CLIENTS GRID
   ============================================ */
.clients-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--spacing-md);
  margin: var(--spacing-lg) 0;
}

.client-card {
  background: white;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  text-align: center;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.client-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.client-card img {
  max-width: 100%;
  height: auto;
  margin: 0;
}

/* ============================================
   CONTACT FORM
   ============================================ */
.contact-form {
  max-width: 600px;
  margin: var(--spacing-xl) auto;
}

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

.form-group label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
  color: var(--color-primary);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: var(--spacing-sm);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-primary);
  font-size: 1rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 51, 102, 0.1);
}

.form-group textarea {
  min-height: 150px;
  resize: vertical;
}

.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  background: var(--gradient-primary);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  box-shadow: var(--shadow-md);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  background: var(--gradient-accent);
}

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

.btn-accent {
  background: var(--gradient-accent);
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
  background: var(--gradient-primary);
  color: white;
  padding: var(--spacing-xl) 0;
  margin-top: var(--spacing-xxl);
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
}

.footer-section h3 {
  color: white;
  font-size: 1.2rem;
  margin-bottom: var(--spacing-md);
  border-bottom: 2px solid var(--color-accent);
  padding-bottom: var(--spacing-xs);
}

.footer-section p,
.footer-section a {
  color: rgba(255, 255, 255, 0.9);
  line-height: 1.8;
}

.footer-section a:hover {
  color: var(--color-accent);
}

.footer-bottom {
  text-align: center;
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.9rem;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

/* Tablet */
@media (max-width: 968px) {
  .main-container {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

  .sidebar {
    position: static;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
  }

  .header-container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .banner-section {
    order: -1;
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.75rem;
  }
}

/* Mobile */
@media (max-width: 640px) {
  :root {
    font-size: 14px;
  }

  .top-bar-container {
    flex-direction: column;
    text-align: center;
  }

  .main-container {
    margin: var(--spacing-md) auto;
  }

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

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

  .footer-container {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 1.75rem;
  }

  h2 {
    font-size: 1.5rem;
  }
}

/* ============================================
   PRINT STYLES
   ============================================ */
@media print {
  .top-bar,
  .sidebar,
  .site-footer {
    display: none;
  }

  .main-container {
    grid-template-columns: 1fr;
  }

  .content {
    box-shadow: none;
    padding: 0;
  }

  a {
    color: var(--color-text);
    text-decoration: underline;
  }
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
.text-center {
  text-align: center;
}

.text-right {
  text-align: right;
}

.mt-lg {
  margin-top: var(--spacing-lg);
}

.mb-lg {
  margin-bottom: var(--spacing-lg);
}

.highlight {
  background: linear-gradient(120deg, rgba(255, 153, 0, 0.2) 0%, rgba(255, 153, 0, 0.1) 100%);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn var(--transition-slow) ease-out;
}

/* Smooth scrollbar */
::-webkit-scrollbar {
  width: 10px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--color-primary-light);
  border-radius: 5px;
}

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