:root {
    /* Cores compartilhadas entre temas */
    --primary: #0057A0; /* Azul Tecnológico */
    --primary-light: #1A6CB4;
    --primary-dark: #004A8C;
    --accent: #34A853; /* Verde Progresso */
    --accent-light: #4AB866;
    --accent-dark: #2E9749;
    
    /* Cores do tema escuro (padrão) */
    --secondary-dark: #202020; /* Cinza Futurista Escuro (Fundo) */
    --secondary-medium: #303030; /* Cinza Futurista Médio (Cards, etc.) */
    --secondary-light: #404040; /* Cinza Futurista Claro */
    --text-light: #E5E7EB; /* Cinza Claro para Texto */
    --text-medium: #D1D5DB; /* Cinza Médio para Texto */
    --text-dark: #303030; /* Cinza Escuro para Texto (em fundos claros) */
    
    /* Variáveis de tema (serão alteradas pelo JS) */
    --background: var(--secondary-dark);
    --card-background: var(--secondary-medium);
    --text-color: var(--text-light);
    --text-muted-color: var(--text-medium);
    --section-alt-bg: var(--secondary-light);
}

/* Tema escuro (padrão) */
html.dark {
    color-scheme: dark;
}

/* Tema claro */
html.light {
    color-scheme: light;
}

html.light:root {
    --secondary-dark: #f8f9fa;
    --secondary-medium: #ffffff;
    --secondary-light: #e9ecef;
    --text-light: #212529;
    --text-medium: #495057;
    --text-dark: #212529;
    
    --background: var(--secondary-dark);
    --card-background: var(--secondary-medium);
    --text-color: var(--text-light);
    --text-muted-color: var(--text-medium);
    --section-alt-bg: var(--secondary-light);
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--background);
    color: var(--text-color);
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Poppins', 'Inter', sans-serif;
    color: var(--text-color);
}

/* Cores de Fundo */
.bg-primary { background-color: var(--primary); }
.bg-primary-light { background-color: var(--primary-light); }
.bg-primary-dark { background-color: var(--primary-dark); }
.bg-secondary { background-color: var(--secondary-medium); }
.bg-accent { background-color: var(--accent); }
.bg-accent-light { background-color: rgba(52, 168, 83, 0.1); }
.bg-background { background-color: var(--background); }
.bg-card { background-color: var(--card-background); }
.bg-section-alt { background-color: var(--section-alt-bg); }

/* Cores de Texto */
.text-primary { color: var(--primary); }
.text-primary-light { color: var(--primary-light); }
.text-secondary { color: var(--text-color); }
.text-muted { color: var(--text-muted-color); }
.text-accent { color: var(--accent); }
.text-on-primary { color: white; }
.text-on-accent { color: white; }
.text-dark { color: var(--text-dark); }

/* Cores de Borda */
.border-primary { border-color: var(--primary); }
.border-secondary { border-color: var(--secondary-light); }
.border-accent { border-color: var(--accent); }
.border-muted { border-color: var(--secondary-light); }

/* Botões */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 0.375rem;
    font-weight: 600;
    transition: all 0.3s ease;
    cursor: pointer;
    text-align: center;
}
.btn-primary { background-color: var(--primary); color: white; }
.btn-primary:hover { background-color: var(--primary-dark); }
.btn-outline { background-color: transparent; border: 2px solid var(--primary); color: var(--primary); }
.btn-outline:hover { background-color: rgba(0, 87, 160, 0.1); color: var(--primary-light); }
.btn-accent { background-color: var(--accent); color: white; }
.btn-accent:hover { background-color: var(--accent-dark); }

/* Cards */
.card {
    background-color: var(--card-background);
    border-radius: 0.5rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
    color: var(--text-color);
    overflow: hidden; /* Para bordas arredondadas */
    display: flex;
    flex-direction: column;
    height: 100%; /* Garante que os cards tenham a mesma altura */
}
.card-content {
    padding: 1.5rem;
    flex-grow: 1; /* Faz o conteúdo crescer */
}
.card:hover {
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
    transform: translateY(-5px);
}
.card h3, .card h4 { color: var(--text-light); }
.card p, .card li { color: var(--text-muted-color); }
.card a {
    color: var(--primary-light);
    text-decoration: none;
    font-weight: 600;
}
.card a:hover {
    text-decoration: underline;
}
.card .text-accent { color: var(--accent-light); }
.card-footer {
    padding: 1rem 1.5rem;
    background-color: rgba(0,0,0,0.1); /* Fundo sutil para o rodapé do card */
    border-top: 1px solid var(--secondary-light);
    margin-top: auto; /* Empurra o rodapé para baixo */
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 50;
    transition: background-color 0.3s ease, box-shadow 0.3s ease, padding 0.3s ease;
    background-color: var(--background);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
}
.header a { color: var(--text-color); }
.header a:hover { color: var(--primary-light); }
.header .text-primary-light { color: var(--primary-light); }

/* Seções */
.section { padding: 5rem 0; }
.section-alt { background-color: var(--section-alt-bg); }

/* Animações */
.fade-in { animation: fadeIn 1s ease-in-out; }
.slide-up { animation: slideUp 1s ease-in-out; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }

/* Theme Toggle Button */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 9999px;
    background-color: var(--card-background);
    color: var(--text-color);
    border: 1px solid var(--secondary-light);
    cursor: pointer;
    transition: all 0.3s ease;
    margin-left: 1rem;
}
.theme-toggle:hover { background-color: var(--section-alt-bg); }
.theme-toggle svg { width: 1.25rem; height: 1.25rem; }

/* Footer Background Pattern */
footer {
    background-image: url('assets/footer_pattern.png');
    background-size: contain;
    background-repeat: repeat;
}