:root {
  --bg-color: #0f172a;
  --card-bg: rgba(30, 41, 59, 0.7);
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --primary-glow: rgba(59, 130, 246, 0.5);
  
  --color-estoque: #10b981;
  --color-esteira: #f59e0b;
  --color-bike: #06b6d4;
  --color-tarefas: #6366f1;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
  background-color: var(--bg-color);
  background-image: 
    radial-gradient(at 0% 0%, rgba(59, 130, 246, 0.15) 0px, transparent 50%),
    radial-gradient(at 100% 0%, rgba(16, 185, 129, 0.1) 0px, transparent 50%),
    radial-gradient(at 100% 100%, rgba(99, 102, 241, 0.1) 0px, transparent 50%);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  overflow-x: hidden;
}

.container {
  width: 100%;
  max-width: 1200px;
  padding: 2rem;
  text-align: center;
}

header {
  margin-bottom: 4rem;
  animation: fadeInDown 0.8s ease-out;
}

header h1 {
  font-size: 3rem;
  font-weight: 800;
  background: linear-gradient(to right, #60a5fa, #34d399);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 1rem;
}

header p {
  color: var(--text-secondary);
  font-size: 1.25rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  width: 100%;
}

.card {
  background: var(--card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 1.5rem;
  padding: 2.5rem 2rem;
  text-decoration: none;
  color: inherit;
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-10px);
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at center, var(--glow-color), transparent 70%);
  opacity: 0;
  transition: opacity 0.4s ease;
  z-index: -1;
}

.card:hover::before {
  opacity: 0.15;
}

.icon-wrapper {
  width: 80px;
  height: 80px;
  border-radius: 1.25rem;
  background: rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  color: var(--theme-color);
  transition: transform 0.4s ease;
}

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

.card h2 {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
  font-weight: 700;
}

.card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.5;
}

/* Themes */
.card-estoque { --theme-color: var(--color-estoque); --glow-color: var(--color-estoque); }
.card-esteira { --theme-color: var(--color-esteira); --glow-color: var(--color-esteira); }
.card-bike { --theme-color: var(--color-bike); --glow-color: var(--color-bike); }
.card-tarefas { --theme-color: var(--color-tarefas); --glow-color: var(--color-tarefas); }

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

@media (max-width: 640px) {
  header h1 { font-size: 2.25rem; }
  .grid { padding: 0 1rem; }
}