@import url('https://api.fontshare.com/v2/css?f[]=satoshi@900,700,500,400&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&display=swap');

:root {
  /* Colors */
  --bg-color: #ffffff;
  --text-primary: #111111;
  --text-secondary: #666666;
  --text-tertiary: #999999;
  --bg-secondary: #f9f9f9;
  --bg-tertiary: #f0f0f0;
  --border-color: #eaeaea;
  --accent: #4B1D52; /* Beringela / Eggplant */
  --accent-light: #f5ebf7;
  
  /* Typography */
  --font-display: 'Satoshi', sans-serif;
  --font-body: 'Inter', sans-serif;
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 1rem;
  --space-4: 2rem;
  --space-5: 4rem;
  --space-6: 8rem;
  --space-7: 12rem;
  
  /* Mathematical Rhythm (Apple/Linear style) */
  --rhythm-40: 2.5rem; /* 40px */
  --rhythm-80: 5rem;   /* 80px */
  --rhythm-120: 7.5rem;/* 120px */
  --rhythm-160: 10rem; /* 160px */
  
  /* Layout */
  --container-width: 1000px;
  --container-width-large: 1200px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  
  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

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

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

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

/* Typography Base */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  font-weight: 900;
  letter-spacing: -0.03em;
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
}

p {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 65ch;
  margin-bottom: var(--space-3);
  font-weight: 300;
}

.text-large {
  font-size: clamp(1.25rem, 2vw, 1.5rem);
  line-height: 1.5;
  color: var(--text-secondary);
  font-weight: 300;
}

.text-primary { color: var(--text-primary); }
.text-accent { color: var(--accent); }
.font-display { font-family: var(--font-display); }

/* Layout & Containers */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.container-large {
  max-width: var(--container-width-large);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.section {
  padding: var(--space-6) 0;
}

.section-large {
  padding: var(--space-7) 0;
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  padding: var(--space-4) 0;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 100;
  transition: all var(--transition-fast);
}

.navbar-scrolled {
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--border-color);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  text-decoration: none;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.nav-links {
  display: flex;
  gap: var(--space-4);
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
}

/* Buttons & Links */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.9rem;
  text-decoration: none;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
}

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

.btn-primary:hover {
  background-color: var(--accent);
  transform: translateY(-2px);
}

.btn-outline {
  background-color: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-outline:hover {
  border-color: var(--text-primary);
  background-color: var(--bg-secondary);
}

.link-underline {
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 500;
  position: relative;
}

.link-underline::after {
  content: '';
  position: absolute;
  width: 100%;
  height: 1px;
  bottom: -2px;
  left: 0;
  background-color: var(--text-primary);
  transform: scaleX(0);
  transform-origin: bottom right;
  transition: transform var(--transition-fast);
}

.link-underline:hover::after {
  transform: scaleX(1);
  transform-origin: bottom left;
}

/* Animations & Utilities */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

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

.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }

/* Rhythm Utilities */
.mb-40 { margin-bottom: var(--rhythm-40); }
.mb-80 { margin-bottom: var(--rhythm-80); }
.mb-120 { margin-bottom: var(--rhythm-120); }
.mb-160 { margin-bottom: var(--rhythm-160); }
.mt-40 { margin-top: var(--rhythm-40); }
.mt-80 { margin-top: var(--rhythm-80); }
.mt-120 { margin-top: var(--rhythm-120); }
.mt-160 { margin-top: var(--rhythm-160); }

/* Grid Utils */
.grid {
  display: grid;
  gap: var(--space-5);
}

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

@media (max-width: 768px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .nav-container { flex-direction: column; gap: var(--space-3); }
  .nav-links { 
    display: flex; 
    flex-wrap: wrap; 
    justify-content: center; 
    gap: var(--space-3); 
  }
  :root {
    --space-6: 4rem;
    --space-7: 6rem;
    /* Scale down rhythm on mobile */
    --rhythm-40: 2rem;   /* 32px */
    --rhythm-80: 3rem;   /* 48px */
    --rhythm-120: 4.5rem;/* 72px */
    --rhythm-160: 6rem;  /* 96px */
  }
}

/* Footer */
.footer {
  padding: var(--space-5) 0;
  border-top: 1px solid var(--border-color);
  margin-top: var(--space-6);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-links {
  display: flex;
  gap: var(--space-4);
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

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

.footer-copy {
  color: var(--text-tertiary);
  font-size: 0.875rem;
}

/* Background Flow Lines */
.bg-flow {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  overflow: hidden;
  opacity: 0.03;
  pointer-events: none;
}

.bg-flow svg {
  width: 100%;
  height: auto;
  min-height: 100%;
}

/* Language Toggle System */
body.lang-en [data-lang="pt"] { display: none !important; }
body.lang-pt [data-lang="en"] { display: none !important; }

.lang-toggle-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
  font-family: var(--font-body);
  font-weight: 600;
  cursor: pointer;
  margin-left: var(--space-4);
  transition: all var(--transition-fast);
}

.lang-toggle-btn:hover {
  background: var(--bg-secondary);
}

@media (max-width: 768px) {
  .lang-toggle-btn {
    margin-left: 0;
    margin-top: var(--space-3);
  }
}