/* Design Tokens */
:root {
  /* Colors */
  --color-primary: #2A629B;
  --color-primary-hover: #214E7D;
  --color-secondary: #39B4E1;
  --color-muted: #F4F4F5;
  --color-muted-foreground: #71717A;
  --color-accent: #F4F4F5;
  --color-destructive: #CE3636;
  --color-background: #FFFFFF;
  --color-foreground: #18181B; /* Darker grey for better readability */
  --color-brand-blue-medium: #3896B3;
  --color-white: #FFFFFF;
  --color-light-gray: #F8F9FA;

  /* Typography */
  --font-family-headings: 'Montserrat', sans-serif;
  --font-family-body: 'Open Sans', sans-serif;
  --font-weight-normal: 400;
  --font-weight-bold: 700;

  /* Spacing */
  --spacing-unit: 4px;
  --spacing-xs: calc(var(--spacing-unit) * 2); /* 8px */
  --spacing-sm: calc(var(--spacing-unit) * 4); /* 16px */
  --spacing-md: calc(var(--spacing-unit) * 6); /* 24px */
  --spacing-lg: calc(var(--spacing-unit) * 8); /* 32px */
  --spacing-xl: calc(var(--spacing-unit) * 12); /* 48px */
  --spacing-xxl: calc(var(--spacing-unit) * 20); /* 80px */

  /* UI */
  --border-radius: 0.5rem;
  --border-radius-sm: 0.25rem;
  --box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --transition: all 0.3s ease;
}

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

body {
  font-family: var(--font-family-body);
  color: var(--color-foreground);
  background-color: var(--color-background);
  line-height: 1.6;
  font-size: 16px;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family-headings);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
  line-height: 1.2;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }

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

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

ul { list-style: none; }

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

/* Layout Containers */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.section {
  padding: var(--spacing-xxl) 0;
}

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

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

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

/* Grid Utilities */
.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.grid-2 { grid-template-columns: repeat(1, 1fr); }
.grid-3 { grid-template-columns: repeat(1, 1fr); }
.grid-4 { grid-template-columns: repeat(1, 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); }
}

/* Buttons */
.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--border-radius);
  font-family: var(--font-family-headings);
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
  font-size: 0.9rem;
  cursor: pointer;
  border: 2px solid transparent;
  text-align: center;
}

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

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

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

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

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

.btn-white:hover {
  background-color: var(--color-muted);
}

/* Header & Navigation */
.header {
  background-color: var(--color-white);
  box-shadow: var(--box-shadow);
  position: sticky;
  top: 0;
  z-index: 1000;
  padding: var(--spacing-xs) 0;
}

.nav-container {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
}

.logo {
  font-family: var(--font-family-headings);
  font-weight: var(--font-weight-bold);
  font-size: 1.5rem;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  transform: translateY(2px);
  justify-self: start;
}

/* Logo S icon placeholder since we don't have the image file yet */
.logo-image {
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-links {
  display: none;
  justify-self: center;
}

.nav-cta {
  justify-self: end;
  white-space: nowrap;
}

@media (max-width: 767px) {
  .nav-cta {
    display: none;
  }
  .nav-container {
    grid-template-columns: auto auto;
    justify-content: space-between;
  }
  .mobile-menu-btn {
    justify-self: end;
  }
}


@media (max-width: 880px) {
  .logo-text {
    display: none;
  }
}

.nav-links a {
  font-weight: 500;
}

.nav-links a:hover, .nav-links a.active {
  color: var(--color-secondary);
}
.hero-actions .btn-white {
  margin-bottom: 10px;
}

.mobile-menu-btn {
  display: block;
  font-size: 1.5rem;
  background: none;
  border: none;
  color: var(--color-primary);
  cursor: pointer;
}

@media (min-width: 768px) {
  .nav-links { 
    display: flex; 
    align-items: center;
    gap: var(--spacing-lg);
  }
  .mobile-menu-btn { display: none; }
}

/* Mobile Menu */
.mobile-nav {
  position: fixed;
  top: 90px; /* Adjust based on header height */
  left: 0;
  width: 100%;
  background-color: var(--color-white);
  padding: var(--spacing-md);
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  transform: translateY(-150%);
  transition: transform 0.3s ease-in-out;
  z-index: 999;
}

.mobile-nav.open {
  transform: translateY(0);
}

.mobile-nav a {
  display: block;
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--color-muted);
  font-weight: 500;
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-brand-blue-medium) 100%);
  color: var(--color-white);
  padding: var(--spacing-xxl) 0;
  text-align: center;
}

.hero h1 {
  color: var(--color-white);
  margin-bottom: var(--spacing-md);
}

.hero p {
  font-size: 1.2rem;
  max-width: 800px;
  margin: 0 auto var(--spacing-lg);
  opacity: 0.9;
}

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

.section-header h2 {
  position: relative;
  display: inline-block;
}

.section-header h2::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background-color: var(--color-secondary);
  margin: var(--spacing-xs) auto 0;
  border-radius: 2px;
}

/* Cards */
.card {
  background-color: var(--color-white);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  box-shadow: var(--box-shadow);
  transition: var(--transition);
  height: 100%;
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.card-icon {
  font-size: 2.5rem;
  color: var(--color-secondary);
  margin-bottom: var(--spacing-md);
}

.card h3 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
}

.card p {
  color: var(--color-muted-foreground);
  flex-grow: 1;
}

/* About Section */
.about-content {
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
  margin-top: var(--spacing-xl);
}

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

.stat-item h3 {
  font-size: 2.5rem;
  color: var(--color-secondary);
  margin-bottom: 0;
}

/* Feature Highlight (Bioimpedance) */
.feature-highlight {
  background-color: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--border-radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

@media (min-width: 768px) {
  .feature-highlight { flex-direction: row; }
}

.feature-content {
  padding: var(--spacing-xl);
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.feature-content h2 { color: var(--color-white); }
.feature-content h2::after { background-color: var(--color-white); margin: var(--spacing-xs) 0 0; }
.feature-content p { font-size: 1.1rem; opacity: 0.9; margin-bottom: var(--spacing-lg); }

.feature-image {
  position: relative;
  flex: 1;
  min-height: 400px;
  border-radius: var(--border-radius);
  overflow: hidden;
}

@media (max-width: 767px) {
  .feature-image {
    min-height: 250px;
  }
}

.feature-image::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
}

/* Client Logos */
.client-logos {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--spacing-xl);
  align-items: start;
  justify-items: center;
}

.client-logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--spacing-sm);
}

.client-logo img {
  height: 72px;                /* altura visual uniforme */
  max-width: 160px;
  object-fit: contain;
  display: block;
  margin: 0 auto;

  filter: grayscale(100%);
  opacity: 0.75;
  transition: opacity 0.3s ease, filter 0.3s ease;
}

.client-logo-name {
  font-family: var(--font-family-headings);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-muted-foreground);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.client-logo:hover img {
  filter: grayscale(0%);
  opacity: 1;
}

.client-logo:hover .client-logo-name {
  color: var(--color-foreground);
}

/* Expert Profile */
.expert-profile {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-lg);
  background-color: var(--color-white);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  max-width: 800px;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .expert-profile { flex-direction: row; text-align: left; }
}

.expert-image-container {
    flex-shrink: 0;
}

.expert-image {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  background-color: var(--color-muted);
  object-fit: cover;
  flex-shrink: 0;
}
@media (min-width: 768px) {
  .expert-image {
    width: 170px;
    height: 170px;
  }
}

.expert-info h3 { margin-bottom: var(--spacing-xs); }
.expert-role { color: var(--color-secondary); font-weight: bold; margin-bottom: var(--spacing-sm); }

/* Contact */
.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  align-items: center;
  font-size: 1.1rem;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}


.feature-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

@media (min-width: 768px) {
  .feature-highlight {
    flex-direction: row;
  }
}

/* Footer */
.footer {
  background-color: var(--color-foreground);
  color: var(--color-white);
  padding: var(--spacing-xl) 0;
  text-align: center;
  font-size: 0.9rem;
}

.footer p { opacity: 0.7; }

/* Utilities */
.hidden { display: none; }