/* ============================================
   Teacher Carol's Toolkit - Sistema de Variáveis CSS
   ============================================ */

:root {
  /* === CORES PRIMÁRIAS === */
  --primary-50: #f0fdf4;
  --primary-100: #dcfce7;
  --primary-200: #bbf7d0;
  --primary-300: #86efac;
  --primary-400: #4ade80;
  --primary-500: #22c55e;
  --primary-600: #16a34a;
  --primary-700: #15803d;
  --primary-800: #166534;
  --primary-900: #14532d;

  /* === CORES NEUTRAS === */
  --neutral-50: #fafafa;
  --neutral-100: #f5f5f5;
  --neutral-200: #e5e5e5;
  --neutral-300: #d4d4d4;
  --neutral-400: #a3a3a3;
  --neutral-500: #737373;
  --neutral-600: #525252;
  --neutral-700: #404040;
  --neutral-800: #262626;
  --neutral-900: #171717;

  /* === CORES DE DESTAQUE === */
  --accent-blue: #3b82f6;
  --accent-purple: #a855f7;
  --accent-orange: #f97316;
  --accent-pink: #ec4899;

  /* === APLICAÇÃO DAS CORES === */
  --color-background: var(--neutral-50);
  --color-surface: #ffffff;
  --color-primary: var(--primary-600);
  --color-primary-hover: var(--primary-700);
  --color-text-primary: var(--neutral-900);
  --color-text-secondary: var(--neutral-600);
  --color-text-tertiary: var(--neutral-500);
  --color-border: var(--neutral-200);
  --color-border-hover: var(--primary-300);

  /* === TIPOGRAFIA === */
  --font-family-base: 'Lexend', 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  --font-family-heading: 'Lexend', 'Segoe UI', 'Roboto', sans-serif;
  
  --font-size-xs: 0.75rem;      /* 12px */
  --font-size-sm: 0.875rem;     /* 14px */
  --font-size-base: 1rem;       /* 16px */
  --font-size-lg: 1.125rem;     /* 18px */
  --font-size-xl: 1.25rem;      /* 20px */
  --font-size-2xl: 1.5rem;      /* 24px */
  --font-size-3xl: 1.875rem;    /* 30px */
  --font-size-4xl: 2.25rem;     /* 36px */
  
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* === ESPAÇAMENTO === */
  --spacing-xs: 0.25rem;    /* 4px */
  --spacing-sm: 0.5rem;     /* 8px */
  --spacing-md: 1rem;       /* 16px */
  --spacing-lg: 1.5rem;     /* 24px */
  --spacing-xl: 2rem;       /* 32px */
  --spacing-2xl: 3rem;      /* 48px */
  --spacing-3xl: 4rem;      /* 64px */

  /* === BORDAS === */
  --border-radius-sm: 0.375rem;   /* 6px */
  --border-radius-md: 0.5rem;     /* 8px */
  --border-radius-lg: 0.75rem;    /* 12px */
  --border-radius-xl: 1rem;       /* 16px */
  --border-radius-2xl: 1.5rem;    /* 24px */
  --border-radius-full: 9999px;

  --border-width-thin: 1px;
  --border-width-medium: 2px;
  --border-width-thick: 3px;

  /* === SOMBRAS === */
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

  /* === TRANSIÇÕES === */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);

  /* === LAYOUT === */
  --max-width-container: 1200px;
  --header-height: 60px;
  --footer-height: 40px;

  /* === GRADIENTES === */
  --gradient-primary: linear-gradient(135deg, var(--primary-400) 0%, var(--primary-600) 100%);
  --gradient-surface: linear-gradient(180deg, var(--neutral-50) 0%, var(--primary-50) 100%);
}

/* ============================================
   RESET E ESTILOS BASE
   ============================================ */

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: 1.6;
  color: var(--color-text-primary);
  background: var(--gradient-surface);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ============================================
   TIPOGRAFIA
   ============================================ */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family-heading);
  font-weight: var(--font-weight-bold);
  line-height: 1.2;
  color: var(--color-text-primary);
}

h1 {
  font-size: var(--font-size-4xl);
}

h2 {
  font-size: var(--font-size-3xl);
}

h3 {
  font-size: var(--font-size-2xl);
}

h4 {
  font-size: var(--font-size-xl);
}

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

/* ============================================
   LAYOUT PRINCIPAL
   ============================================ */

.container {
  max-width: var(--max-width-container);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

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

.header {
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: box-shadow var(--transition-base);
  padding: var(--spacing-sm) 0;
}

.header.scrolled {
  box-shadow: var(--shadow-lg);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  height: var(--header-height);
  gap: var(--spacing-lg);
  padding: 0 var(--spacing-lg);
  /* max-width: var(--max-width-container); */
  margin: 0 auto;
}

.logo-container {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  text-decoration: none;
  transition: transform var(--transition-base);
}

.logo-container:hover {
  transform: scale(1.02);
}

.logo {
  width: 45px;
  height: 45px;
  border-radius: var(--border-radius-lg);
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-lg);
  box-shadow: var(--shadow-md);
}

.logo-img {
  width: 45px;
  height: 45px;
  object-fit: contain;
  border-radius: var(--border-radius-lg);
}

.site-title {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.site-title h1 {
  font-size: var(--font-size-xl);
  color: var(--color-primary);
  margin: 0;
}

.site-subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
  font-weight: var(--font-weight-medium);
}

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

.hero {
  padding: var(--spacing-2xl) 0;
  text-align: center;
}

.hero h2 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

.hero p {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ============================================
   TOOLS GRID
   ============================================ */

.tools-section {
  padding: 0 0 var(--spacing-2xl);
  flex: 1;
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.section-title {
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
}

.section-subtitle {
  color: var(--color-text-tertiary);
  font-size: var(--font-size-lg);
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--spacing-lg);
}

/* ============================================
   TOOL CARD
   ============================================ */

.tool-card {
  background: var(--color-surface);
  border-radius: var(--border-radius-lg);
  border: var(--border-width-medium) solid var(--color-border);
  padding: var(--spacing-lg);
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  min-height: 240px;
}

.tool-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--transition-base);
}

.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 25px -5px rgba(34, 197, 94, 0.2), 0 10px 10px -5px rgba(34, 197, 94, 0.15);
  border-color: var(--color-border-hover);
}

.tool-card:hover::before {
  transform: scaleX(1);
}

.tool-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--border-radius-md);
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-2xl);
  transition: transform var(--transition-base);
  flex-shrink: 0;
}

.tool-card:hover .tool-icon {
  transform: scale(1.1) rotate(5deg);
}

.tool-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
}

.tool-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  line-height: 1.3;
  margin: 0;
}

.tool-description {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  line-height: 1.5;
  margin-bottom: var(--spacing-sm);
  flex-grow: 1;
}

.tool-description .highlight {
  color: var(--primary-600);
  font-weight: var(--font-weight-semibold);
}

.tool-status {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--border-radius-full);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
}

.status-available {
  background: var(--primary-100);
  color: var(--primary-700);
}

.status-coming-soon {
  background: var(--neutral-200);
  color: var(--neutral-700);
}

.status-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: currentColor;
}

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

.footer {
  background: var(--color-surface);
  border-top: var(--border-width-thin) solid var(--color-border);
  padding: var(--spacing-md) 0;
  margin-top: auto;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
  text-align: center;
}

.footer p {
  margin: 0;
  color: var(--color-text-tertiary);
  font-size: var(--font-size-sm);
}

.footer-heart {
  color: var(--accent-pink);
  animation: heartbeat 1.5s ease-in-out infinite;
}

@keyframes heartbeat {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.1);
  }
}

/* ============================================
   RESPONSIVIDADE
   ============================================ */

@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }

  .header-content {
    flex-direction: column;
    height: auto;
    padding: var(--spacing-md) 0;
  }

  .site-title h1 {
    font-size: var(--font-size-lg);
  }

  .hero {
    padding: var(--spacing-xl) 0;
  }

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

  .tools-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

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

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-md);
  }

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

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

/* ============================================
   UTILIDADES
   ============================================ */

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

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

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

.hidden {
  display: none;
}

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

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

/* ============================================
   FOOTER HEART ICON
   ============================================ */

.footer-heart-icon {
  vertical-align: middle;
  display: inline-block;
}